TW201243841A - Recording device, recording method, and optical recording medium - Google Patents

Abstract

Provided is a recording device whereby it is possible to set the sound-to-noise ratio to an appropriate level. Also provided are a recording method and an optical recording medium. In this recording device, laser beams are collected at the interfaces of a first layer and a second layer of an optical recording medium having a structure in which a plurality of interfaces of a first layer and a second layer is formed, and a recording mark accompanied by the fluctuations of the refraction index and/or the variations in the shape of the interfaces is formed in the vicinity of the interfaces without forming a void mark.

Description

201243841 SUMMARY OF THE INVENTION [Technical Field] The present disclosure relates to a recording apparatus, a recording method, and an optical recording medium for performing recording recording of an optical recording medium for signal recording/reproduction by irradiation of light. The present application is based on and claims the benefit of priority to the benefit of the benefit of the benefit of the benefit of the benefit of the benefit of the benefit of the benefit of the benefit of the benefit of the benefit of the benefit of the benefit of the benefit of the benefit of the benefit of the benefit of the benefit of the benefit of the benefit of the benefit of the benefit of the benefit of the benefit of the benefit of the benefit of the benefit of the benefit of the benefit of the benefit of the benefit of the benefit of the benefit of the benefit of the benefit of the benefit of the benefit of the benefit of the benefit of the benefit of the benefit of the benefit of the benefit of the benefit of the benefit of the present disclosure. [Prior Art] As an optical recording medium for signal recording/reproduction using light irradiation, for example, CD (Compact Disc), DVD (Digital Versatile Disc), and (10) (8) Bu (4) Disc: Blu-ray Disc have been popular. , registered trademarks, and so on. The applicant of the present application has previously proposed a so-called capacity recording type optical recording as disclosed in Patent Document 1 or Patent Document 2, which is the next-generation light recording medium that can be used in such optical recording media, such as CDs, DVDs, and BDs. media. Here, the 'stomach volume recording' means that, for example, as shown in FIG. 17, an optical recording medium having at least a cover layer 101 and a capacity layer (recording layer) 丨〇 2 is subjected to laser light irradiation by sequentially changing the focus position. A technique of performing multi-layer* recording in the capacity layer 1〇2 to achieve a large capacity for recording. 4 Regarding such capacity recording, Patent Document 1 discloses a recording technique called a micro-image mode. The micro holographic method uses a so-called hologram recording material as a recording material of the capacity layer 102. As the hologram recording material, for example, a photopolymerizable photopolymer or the like is known. The micro-image mode is roughly divided into a positive micro-image mode and a negative micro-image 161999.doc 201243841 mode. In the positive micro-image mode, the two beams of the opposite beams are condensed in the same position to form fine interference fringes (whole images) and this is used as a method of recording marks. Further, the negative micro-image mode is based on the opposite of the positive micro-image mode, and the pre-formed interference fringes are removed by laser light irradiation and removed. P is a method of recording marks. In the negative micro-full image method, it is necessary to form an interference fringe in advance in the capacity layer as an initializing process. Furthermore, the applicant of the present invention has proposed a recording method (a void recording method) in which a void (empty bag, void) is formed as a recording mark, as disclosed in Patent Document 2, as a capacity recording method. The gap recording method performs reading of the recording signal by detecting the difference T between the reflectance of the formed portion and the non-formed portion of the void (reproduction, in particular, the curvature of the formed portion of the void is large, and the partial reflectance of the void is not formed. Smaller (zero), based on the detection result of the difference in reflectance on the supplemental detector, the reproduced signal is obtained. To raise the level of the reproduced signal (the contrast between the mark forming portion and the non-formed portion) is effective. The size of the large gap, whereby the reflectance becomes large. That is, the 'void recording method' reproduces the L-level (the contrast between the mark-forming portion and the non-formed portion) by increasing the size of the void. The gap recording method is different from the above-described micro-holographic method, and since the hologram is not formed, only one side of the light can be irradiated at the time of recording. That is, the positive hologram like the above can be eliminated. In the case of the Fang Pei Wang family, the two beams are condensed in the same position to form a recording mark. & Compared with the negative micro-image, there is an excellent 4a that does not require initial processing. Further, in the above-mentioned Patent Document 1, although the example of the pre-hardened light irradiation 161999.doc 201243841 which is recorded every time the void recording is performed is not disclosed, the irradiation of the pre-hardened light can be omitted. [Prior Art Document] [Patent Document] [Patent Document 1] Japanese Laid-Open Patent Publication No. 2008-135144 [Patent Document 2] JP-A-2008-176902 SUMMARY OF INVENTION [Problems to be Solved by the Invention] However, when the multi-layer recording is used, for example, when performing recording of a dozen layers or tens of layers or so, it is necessary to consider crosstalk in the depth direction. In the case where light is collected in the gap and reproduced, there are positions from other layers. The reflected light of the gap leaks to the top of the detector, and thus there is a problem that the S/N is deteriorated. It is an object of the present invention to provide a recording apparatus, a recording method, and an optical recording medium which can be easily adjusted to an appropriate S/N. Means for Solving the Problem] The recording device of the present technology is configured such that laser light is concentrated in the vicinity of an interface of an optical recording medium having a structure in which a plurality of interfaces of the first layer and the second layer are formed, and In the vicinity of the surface, a recording mark is formed which does not form a blank mark and is accompanied by a change in the refractive index and/or a change in the shape of the interface. The recording method of the present technique condenses the laser light to have a plurality of layers and a second layer. The interface of the layer is constructed in the vicinity of the interface of the optical recording medium, and a recording mark is formed in the vicinity of the interface that does not form a blank mark and is accompanied by a change in the refractive index and/or a change in the shape of the interface. 161999.doc 201243841 The present technology The optical recording medium has a structure in which a plurality of first layers and a first interface are formed, and a recording is formed in the vicinity of the interface so as not to form an empty label, and the refractive index is changed and/or the shape of the interface is changed. The recording device, the recording method, and the optical recording medium of the present technology form a plurality of interfaces of the first layer and the second layer, and form a modulation accompanying the temple rate and/or the shape of the interface in the vicinity of the interface. Record mark of change. Thereby, the presence or absence of the formation of the mark (reproduction of the recording signal) can be performed depending on the optical path length difference (phase difference) of the reflected light generated by the mark forming portion and the other portion. That is, signal reproduction by the so-called phase difference detection can be performed. According to the recording apparatus, the recording method, and the optical recording medium of the present technology, since the modulation of the refractive index and/or the change of the shape of the interface are formed in the vicinity of the interface between the first layer and the second layer, the phase can be performed. Signal regeneration for differential detection. Thus ' can be easily adjusted to the appropriate S/N. [Embodiment] Hereinafter, embodiments of the present technology will be described. In addition, the description proceeds in the following order. <1. First Embodiment> [1-1. Optical recording medium according to the first embodiment] [1-2. About servo control] Π-3·Configuration of recording device] [1-4. Specific recording Media composition and record reproduction principle] Π-5. Effect] <2. Second embodiment><3. Third Embodiment> 161999.doc 201243841 <4. Fourth embodiment><5. Fifth embodiment><6. Sixth embodiment><7.Variations><1. First Embodiment> Π -1. Optical recording medium according to the first embodiment. Fig. 1 shows a cross-sectional structure of the optical recording medium 1 of the first embodiment. The optical recording medium 1 is a disk-shaped optical recording medium that performs laser mark recording (information recording) with respect to the optical recording medium i that drives the rotation. Further, even if the reproduction of the recorded information is performed, the optical recording medium 1 that drives the rotation is irradiated with the laser light. As shown in Fig. 1, in the optical recording medium 1 of the present embodiment, the cover layer 2 and the selective reflection film 3 are formed in this order from the upper layer side, and the intermediate layer 4 and the recording layer 5 are alternately laminated on the lower layer side. Here, the "upper side J" refers to the upper layer side when the surface from which the laser light from the recording device side to be described later is incident is the upper surface. The intermediate layer 4 formed at the lowermost portion serves as the cover layer (protection) The number of times of the reverse layering of the intermediate layer 4 and the recording layer 5 is the same as that of the natural layer of the lanthanide system 2 or more - the number of people X is set to return to the layer of the same layer, and counts - times, that is, "the middle layer" When the number of layers of the recording layer 5/intermediate layer 4 is reversed, as long as at least three layers are recorded as multi-layer recording, it is assumed to be, for example, χ=ι〇~ι5. 161999.doi 201243841 The intermediate layer 4 and the recording layer 5 have different refractive indices from each other. That is, the light § recording medium 1 in this case has a structure in which the refractive indices of the alternately laminated layers are different from each other, and thus the first and second layers having different refractive indices are formed. The structure of the XΛ interface between the layer and the second layer. In these structures, the interface between the intermediate layer 4 and the § recording layer 5, and the upper surface and the lower surface of the u + P » recorded layer 5 function as a reflecting surface due to the difference in refractive index. Regarding the specific refractive index, the rear *51·My, (four) half system, the third layer 3 such as the intermediate layer 4, the recording layer 5 = 1.65, etc. The reflectance of the interface between the recording layer 5 and the intermediate layer 4 can be set, for example, at 0.5%. Left; & and the transmittance of the interface is set to, for example, about the township. The specific material of the optical recording medium of the present embodiment is as follows: the upper surface and the lower surface of the recording layer 5 are as follows. (that is, the interface between the recording layer 5 and the intermediate layer 4) is the object, and the laser light for collecting light is recorded, and the interface is formed by the interface of the 々曰耵3. If the interface is recorded, for example, as long as the image; P, i The number of times of re-stacking is about 15 or so, and the number of recordable interfaces can be doubled to about 20 to 30. From this, it can be understood that the number of the same recording layer (or even the recording capacity) is realized according to the embodiment in which the interface recording is performed. The multi-layer optical recording medium which performs W mark recording with respect to the previous per-recording layer can suppress the number of overlying layers which should be formed in the intermediate layer/s recording layer of the recording medium to half. When the recording is performed on the interface of each of the recording layers 5 as described above, in the optical recording medium, the upper surface of the recording layer 5 located on the uppermost layer is directly projected on the lower surface of the recording layer 5 on the lowermost layer. Can be implemented as a mark In the following, the area in the depth direction in which the optical recording medium i has 16l999.doc 201243841 in which the mark can be recorded is referred to as the recordable area 7. The cover layer 2 is made of a resin such as polycarbonate or acrylic. A position guide member for guiding the recording/reproduction position is formed in the lower surface side. In the case of this example, as the position guide member, a groove (continuous groove) or a pit row is formed. Therefore, the position guide of the guide groove is formed by the formation of the guide groove along the lower surface side of the cover layer 2. For example, in the case where the guide groove is a groove, it is formed by periodic meandering. The groove can be recorded according to the cycle information of the meandering position §fl (address information), and when the guiding groove is in the case of the pit row, the position information can be recorded according to the modulation of the length of the pit. The cover layer 2 is formed by injection molding or the like using a stamper in which the guide groove (concave-convex shape) is formed. Further, the selective reflection film 3 is formed on the lower surface side of the cover layer 2. Here, It 17 is not particularly described, but the conventional large-capacity recording method is configured such that a guide groove is formed in the same manner as the optical recording medium 1 shown in FIG. 1 when the mark recording is performed on the large-capacity layer as the recording layer. When the mark recording is performed on the large-capacity layer, the recording light (recording laser light) is irradiated with respect to the large-capacity layer, and the above-mentioned guide groove is used as the object of the above-mentioned guide groove to obtain another irradiation. Servo light (servo laser light) for tracking or focusing error signals. At this time, if the reflection film to be formed on the reference surface Ref is a normal reflection film (reflection film without wavelength selectivity), The reflective film reflects the laser light, which causes the recording power to be attenuated. Therefore, based on the wavelength difference light between the recording light and the laser light, the selective reflection 161999.doc 201243841 film 3» is set as the The reflection film 3 is selected to have a wavelength-selective reflection film that reflects light in the same wavelength range as the servo light and transmits light of other wavelengths. [1-2. Regarding Servo Control] Fig. 2 is a diagram for explaining a servo control method of the optical recording medium 1. The above-mentioned optical recording medium 1 is irradiated with laser light (recording laser light) for forming a recording mark and laser light (for taking laser light) which is different from the wave domain. It is also mentioned later that the recording laser light and the servo laser light are irradiated onto the optical recording medium 1 via a common objective lens. Further, in the case of this example, the optical recording medium 1 is also irradiated with laser light for servo and reproduction. Here, the laser light for servo and reproduction is control for realizing the focus position of the laser light for recording at the time of recording, and control of the reproduction position at the time of reproduction, and laser light for receiving the reflected light by the mark, use and recording. Use laser light of the same wavelength as the laser. In the case of this example, a so-called pulsed laser is used as a light source for recording laser light. Pulsed laser systems, for example, obtain high power lasers in very short periods of time, such as picoseconds, and are therefore difficult to use for obtaining reflected light for recording or recording the marked reproduction light. Therefore, in this example, in addition to the recording light source as the pulse laser, a light source for performing servo or reproduction is separately provided, and laser light from the light source is irradiated to the optical recording as the servo and reproducing laser light. Media 1. The servo and reproducing laser light is also irradiated onto the optical recording medium 1 via the objective lens. Here, in the optical recording medium 1, the position of the recording target position, that is, the interface, does not form a position guide such as a pit or a groove. Therefore, the tracking servo using servo and reproducing laser light cannot be implemented when the mark is not formed in 201243841. In view of this, the tracking servo at the time of recording is implemented using servo laser light. Namely, a tracking error signal based on the reflected light of the servo laser light focused on the selective reflection film 3 is generated, and position control of the tracking direction of the objective lens is performed based on the execution error signal. Thereby, the position of the spot light of the hiring laser light irradiated by the same objective lens can be controlled in an appropriate position in conjunction with the position of the spot light for feeding the laser light. On the other hand, when the singer has recorded the focus word, the use of the feeding service and the reproducing laser light are carried out. In other words, in the state in which the laser light for servo and reproduction is focused on the interface and in other states, the detection intensity of the reflected light of the laser light for servo and reproduction differs. Therefore, the servo light for use in the servo and reproduction is used at this point. Focused servo control of reflected light. Further, when the optical recording medium 1 on which the mark recording has been performed is reproduced, the tracking servo can be implemented by the reflected light of the servo and reproducing laser light. In view of this, the servo control aspect during reproduction is performed by using the servo and the reflected light of the reproducing laser light for both the tracking servo and the focus servo. Here, it is important to note that in the focus servo control, the focus position of the servo and reproducing laser light is different from the focus position of the servo laser light. That is, referring to Fig. 2, it can be understood that as the servo laser light, a tracking error signal based on the reference surface Ref on which the position indexing member is formed should be appropriately and accurately generated, and the focus position thereof must coincide with the reference plane Ref. On the other hand, as the laser light for servo and reproduction (laser light for recording), the focus position 一致 coincides with the interface as the recording target. If this point is considered, the control of the focus direction requires separate control of the servo and regenerative laser light and the servo mine I61999.doc 201243841. In the case of the example τ, the focus control of the t-light for servo is performed by controlling the above-mentioned common objective lens. In the focus control of the laser light for recording and reproducing, and the laser beam for recording, a mechanism for independently controlling the focus positions of the servo, reproducing laser light and the recording laser light is separately provided, and the mechanism is driven and implemented (refer to the figure). 3 lens drive unit 丨 9). Hereinafter, the focus control mechanism will be referred to as "focusing mechanism for recording and reproducing light". In summary, the servo control in the case of this example is implemented as follows. • When recording on the side of the laser light for the service and reproduction (and the laser light for recording), the focus servo is used to drive the focus mechanism for recording and reproducing light using the reflected light of the servo and the reproducing laser light (the tracking servo system) The drive is automatically implemented using an objective lens that uses the reflected light of the servo laser light). At the time of reproduction, the focus servo and the tracking servo are implemented by driving the objective lens using the reflected light of the servo and the reproducing laser light in common. • Servo laser light side When recording, the focus servo is implemented by using a servo laser light to reflect the optical lens. The tracking servo is driven by the objective light of the servo laser light. At the time of reproduction, servo control based on servo laser light is not required for reproduction of the recording mark. However, the position information recorded on the reference plane Ref must be read at the time of starting the reproduction or recording. In this case, the focus servo and the tracking vocabulary of the servo laser light are controlled by the objective lens based on the reflected light of the servo laser light to 161999.doc •12·201243841. Π-3. Configuration of Recording Apparatus] Fig. 3 is a view mainly showing an internal configuration example of an optical system included in the recording apparatus 1A of the embodiment. Specifically, the internal configuration of the optical pickup OP provided in the recording device 10 is mainly displayed. The optical recording medium 1 which is mounted on the recording apparatus 10 in Fig. 3 is provided with a center hole interposed therebetween at a specific position of the recording apparatus 10, and is held in a state in which it can be driven to rotate by a spindle motor which is omitted. The optical pickup unit 1 is provided to illuminate the recording laser light, the servo, the reproducing laser beam, and the servo laser light with respect to the optical recording medium 1 that is driven to rotate by the spindle motor. The optical pickup OP is provided with: a recording laser 11 for performing a laser light for recording laser light for recording of marks; and a laser for reproducing and reproducing 14' for performing information recorded by the mark The source of the laser light for servo and reproduction for controlling the reproduction and recording of the reproduction position. Further, a servo laser 27 is provided for implementing a light source for servo laser light which is controlled by the position of the position guide formed on the reference surface Ref. Here, as described above, the recording laser light and the servo and reproducing laser light are laser light of the same wavelength, and the servo laser light is different from the laser light wave fields. In the case of this example, the wavelength of the laser light for recording and the laser light for servo and reproduction is about 405 nm (so-called blue-violet laser light), and the wavelength of the laser light for servo is about 650 nm (red laser light). Further, an objective lens 23 is provided in the optical pickup OP, which serves as laser light for recording, laser light for servo and reproduction, and laser light for servo to the output end of the optical recording medium 1. Further, the optical pickup OP is provided with servo and reproduction 161999.doc 13 201243841 The light-receiving portion 26' for receiving light from the optical recording medium in summer and the reflected light for reproducing laser light. Further, the following optical system is formed in the optical pickup 〇P. This optical system guides the recording laser light ' emitted by the recording laser 丨i' and the servo and reproducing laser light emitted from the servo/reproduction laser 14 to the objective lens 23, and the optical recording medium that has entered the objective lens 23 from the optical recording medium. The reflected light of the laser light for reproduction and reproduction is guided to the light receiving unit 26 for servo and reproduction light. In the optical system for laser light for recording and for laser light for reproduction and reproduction, the recording laser light emitted from the recording laser 11 passes through the collimator lens 12 to become parallel light, and is incident on the half mirror 13. Further, the servo light for reproduction from the servo/reproduction laser 14 and the reproducing laser light are incident on the half mirror 13 in the same manner as the collimated lens 15 becomes parallel light. The half mirror 13 outputs the recording laser light incident on the side of the recording laser 11 and the optical axes of the servo and reproducing laser light incident from the servo/reproduction laser 14 side. The recording laser light and the servo and reproducing laser light output from the half mirror 13 are incident on the polarization beam splitter 16. The polarizing beam splitter 16 is configured such that the recording laser light for recording and the laser light for reproduction and the laser light for reproduction are configured to transmit the laser light for recording through the polarizing beam splitter 16 and the laser light for the feeding and reproducing to have the fixed lens 17 and the movable lens. The focusing mechanism for recording and reproducing light is configured by the lens 18 and the lens driving unit 19. The recording/reproducing light focusing mechanism is provided with a fixed lens 17 on a side closer to the light source (recording laser 11 and servo/reproduction laser 14), and a movable lens 18 is disposed on a side farther from the light source; The lens drive unit 19 drives the movable lens 18 in a direction parallel to the optical axis. Thereby, independent focus control can be performed on the laser light for recording and the laser for servo and reproduction. In the above description, it is also understood that the lens drive unit 19 for the recording and reproducing light focusing mechanism is driven by the reflected light of the servo and reproducing laser light, and is responsible for the focus servo for the recording laser light and the servo and reproducing laser light. control. The fixed laser light and the servo and reproducing laser light of the fixed lens 17 and the movable lens 18 of the recording and reproducing light focusing mechanism are reflected by the mirror surface 20 as shown in the figure, and then incident on the color separation edge via the 1⁄4 wavelength plate 21. The mirror 22 is configured such that the selective reflection surface reflects the light in the same wavelength range as the laser light for recording and the laser light for servo and reproduction, and the light of other wavelengths is transmitted. Therefore, the recording of the incident as described above is performed. The laser light for the laser beam and the laser light for the servo and the reproduction is reflected by the color separation 稜鏡22. The laser light for recording reflected by the color separation 稜鏡22 is irradiated to the optical recording medium 1 via the objective lens 23 as shown in the drawing. The objective lens 23 is provided with two axes. The actuator 24 holds the objective lens 23 in a focusing direction (a direction in which the optical recording medium 1 approaches or leaves) and a tracking direction (a direction orthogonal to the focusing direction: parallel to a radial direction of the optical recording medium 1) The two-axis actuator 24 is provided with a focus coil and a tracking coil, and the objective lens 23 is respectively focused by giving a drive signal (a drive signal FD-sv ' TD-sv or TD-sp to be described later). direction, In the case where the optical recording medium 1 is irradiated with the laser light for servo and reproduction as described above, the reflected light is obtained from the optical recording medium 1 (the interface to be reproduced). The servo and reproducing thunder thus obtained are obtained. The reflected light of the emitted light is guided to the color separation 稜鏡 22 via the objective lens 23 and is reflected by the color separation 稜鏡 22. The reflected light of the servo and reproducing laser light reflected by the color separation 稜鏡 22 passes through the 1/4 wavelength plate 21-161999 .doc •15·201243841 Mirror 20—The focus of the recording and reproducing light (the movable lens 18—fixed lens 17) is incident on the polarizing beam splitter 16. The laser beam is incident on the servo beam of the polarizing beam splitter 16 and the reflected light of the reproducing laser beam ( The loop light) is caused by the action of the 1/4 wavelength plate 21 and the reflection of the optical recording medium 1 'the polarization direction is 90 degrees different from the path light incident on the polarization beam splitter 丨 6 from the light source side. As a result, as described above The reflected light of the incident laser light for the servo and the reproduction is reflected by the polarizing beam splitter 16. The reflected light of the servo and reproducing laser light reflected by the polarizing beam splitter 16 is condensed on the servo and regenerated by the collecting lens 25. The light-receiving signal obtained by receiving the servo and reproducing laser light by the light receiving unit 26 for the servo and reproducing light is recorded as a light receiving signal DT-sp as shown in the figure. In addition to the above-described optical system for recording laser light for recording and laser light for servo and reproduction, an optical system is formed to guide the laser light for servo laser beam emitted from the servo laser 27 to the objective lens 23 The reflected light of the servo laser light from the optical recording medium 1 incident on the objective lens 23 is guided to the servo light receiving unit 32. As shown, the servo laser light emitted from the servo laser 27 passes through the collimator lens 28. After being parallel light, it is incident on the polarization beam splitter 29. The polarizing beam splitter 29 is configured to transmit servo laser light (going light) incident on the side of the servo laser 27 as described above. The servo laser light transmitted through the polarization beam splitter 29 is incident on the color separation pupil 22 via the quarter-wavelength plate 3. The color separation 稜鏡 22 is configured to reflect light in the same wavelength range as the laser light for recording and the laser light for servo and reproduction, and to transmit light of a wavelength other than the laser beam. Therefore, the above-described servo laser light is transmitted through the objective lens 23 to the optical recording medium 1 through the color separation 稜鏡 161999.doc 16 201243841 22 . By irradiating the optical recording medium 1 with the servo laser light in this manner, the reflected light of the servo laser light can be obtained from the optical recording medium 1 (reference surface Ref). The reflected light of the laser beam is transmitted through the objective lens 23, passes through the color separation pupil 22, and enters the polarization beam splitter 29 via the quarter-wavelength plate 30. In the same manner as in the case of the previous servo, regenerative and laser light, the incident light from the side of the optical recording medium 1 is taken by the reflected light (loop light) of the laser light by the action of the 1/4 wavelength plate 30 and by the optical recording medium. The role of the reflection of 1 'the direction of polarization is 90 degrees different from the light of the road. Therefore, the reflected light of the laser light for the servo light of the loop light is reflected by the polarizing beam splitter 29. The reflected light of the servo laser light reflected by the polarizing beam splitter 29 is condensed on the light receiving surface of the servo light receiving unit 32 via the collecting lens 31. The received light signal obtained by the servo light receiving unit 32 receiving the reflected light of the servo laser light is referred to as the received light signal DT-sv. Next, an example of the internal configuration of the entire recording apparatus 1 will be described with reference to Fig. 4 . In addition, in the internal configuration of the optical pickup 〇ρ in FIG. 4, only the recording laser ray, the servo, the reproducing laser 14, the lens driving unit 19, and the 2-axis are extracted from the configuration of FIG. The actuator is displayed. Although the figure * is omitted, in the recording apparatus 1G, the optical pickup HOP can be slidably driven in the tracking direction by the sliding mechanism. The control of the sliding mechanism is performed by a vocabulary circuit 40 for reproducing light as described later, or a feeding device circuit for the vocal light. Specifically. In the case of recording, the use of the word service light feeding circuit C to perform the tracking control of the objective lens 23 is controlled by (4) service light (4) service $ 42. In addition, in the case of the use of the feeding device and the regenerative light, the tracking device control method of the objective lens 23 is carried out by using the feeding device and the reproducing light 40, and the servo circuit for reproducing the light is used. Control it. In the recording apparatus 1 of FIG. 4, 'as a recording/reproduction for recording the recordable area 7 of the optical recording medium i, or based on reflected light from an interface (and a recording mark) formed in the recordable area 7 The composition of the objective lens/tracking control of the objective lens is as follows. In other words, the light-emitting drive unit 35, the recording processing unit 36, the light-emission drive unit 37, the servo/reproduction light matrix circuit 38, the reproduction processing unit 39, and the servo and reproduction light servo circuit 4A are provided. The light-emitting drive unit 35 drives the servo/regeneration laser 14 by the laser drive signal D-sp based on an instruction from the controller 43. The recording processing unit 36 generates a recording modulation code corresponding to the input recording data. In other words, the recording processing unit 36 performs an addition of an error correction code or a specific recording modulation encoding process with respect to the input recording data, and obtains, for example, "〇" and "1" which are actually recorded on the optical recording medium 1. The valued data line records the modulation code line. The recording processing unit 36 gives a recording signal based on the recording modulation code line thus generated to the light-emission drive unit 37. The light-emitting drive unit 37 generates a laser drive 彳§ D-r based on the recording signal input from the recording processing unit 36, and drives the recording laser 11 based on the drive signal D-r. Further, the "light-emitting drive unit 37" also performs adjustment of the laser power based on an instruction from the controller 43. The servo/reproduction light matrix circuit 38 corresponds to a light receiving signal DT_sp (output current) from a plurality of light receiving elements as the vocalizing and reproducing light receiving unit 26 shown in FIG. 3, and includes a current-voltage conversion circuit and a matrix operation/ Amplifying the circuit, etc.' and using the matrix operation process to generate the necessary signals. Specifically, 161999.doc • 18-201243841, a high frequency No. 7 (hereinafter referred to as a reproduced signal RF) corresponding to the reproduced signal of the above-described recording modulation code line is generated, and a track indicating relative relative to the Z mark mark line is generated. The tracking error signal $TE_sp of the offset amount (tracking error) in the radial direction of the irradiation light of the servo and reproducing laser light is used as a signal for implementing the tracking servo control; and the generation of the relative object is generated. The focus error signal 叩_sp' of the focus error of the servo and reproducing laser light for the interface is used as a signal for performing focus servo control. The reproduction signal RF generated in the servo/reproduction optical matrix circuit 38 is supplied to the reproduction processing unit 39. Further, the focus error signal "E_sp" and the track error signal TE-sp are supplied to the servo/reproducing light servo circuit 4A. The reproduction processing unit 39 performs binarization processing or recording modulation code on the reproduced signal scale 1 The reproduction processing for restoring the recorded data is decoded by the error correction processing, etc., and the reproduced data of the recorded data is reproduced. The servo/reproduced light servo circuit 40 supplies the focus error signal based on the self-serving and reproducing light matrix circuit 38. The FE_sp and the tracking error signal TE_sp respectively generate a focus servo signal FS-sp and a tracking servo signal TS_sp. Further, based on the focus servo signals FS-sp' tracking servo signal TS_sp, respectively generated to drive 2-axis actuation The focus coil of the device 24, the focus drive signal FD-sp of the tracking coil, and the tracking drive signal TD_sp. In the case of this example, the focus drive signal FD-sp is supplied to the lens drive unit 19 as shown. The signal TD-sp is supplied to the switch SW. Further, the servo/reproduced light servo circuit 40 turns off the tracking servo loop based on the instruction from the controller 43, and the 2-axis actuator 2 via the switch 8^^ The tracking coil of the fourth embodiment is provided with a skip pulse, thereby performing the hopping operation of the servo and reproducing laser light 161999.doc 201243841. Further, based on the instruction from the controller 43, the interface for the specific recording layer 5 is performed. The focus servo operation of the laser light for servo and reproduction, or the focus jump operation of the laser light for servo and reproduction. Further, the recording device 10 is provided with a servo light matrix circuit 41 and a servo light servo circuit 42 as servos. A signal processing system for reflecting light of a laser beam. The servo light matrix circuit 41 corresponds to a light receiving signal DT-sv (output current) from a plurality of light receiving elements of the servo light receiving unit 32 shown in FIG. a conversion circuit, a matrix operation/amplification circuit, etc., and generates a necessary signal by a matrix operation process. Specifically, as a signal for performing tracking servo control, a position indicator (track) indicating a relative formation on the reference plane Ref is generated. The tracking error signal TE-sv of the offset amount (tracking error) in the radial direction of the irradiation point of the servo laser light. A focus error signal fe_sv indicating a focus error of the servo laser light with respect to the reference plane Ref (selective reflection film 3) is generated for the signal for performing the focus control. The focus error signal FE_SV, the tracking error signal £_" is supplied to the servo light servo circuit 42. The servo light servo circuit 42 generates a focus servo signal FS_sv and a tracking servo signal TS-sv based on the focus error signal FE_SV and the tracking error signal TE-sv. Further, based on the focus servo signal Fs_sv' tracking servo signal TS-sv, a focus coil for driving the 2-axis actuator 24, a focus drive signal FD-sv of the tracking coil, and a tracking drive signal TD_SV are respectively generated. . In the case of this example, the focus drive signal FD_SV is supplied to the 2-axis actuator 24 (poly 161999.doc 20·201243841 focal coil). On the other hand, the tracking drive signal TD-sv is supplied to the switch SW. Further, the light-feeding feeding circuit 42 turns off the tracking servo circuit based on the instruction from the controller 43, and applies a skip pulse to the tracking coil of the 2-axis actuator 24 via the switch SW. Thereby, the tracking jump operation of the servo laser light or the introduction processing of the focus servo for the servo laser light with the reference plane Ref as the object is performed based on the instruction from the controller 43. The switch SW selects one of the tracking drive signal TD-sp and the tracking drive signal TD-sp to output to the 2-axis actuator 24 (tracking coil) based on an instruction from the controller 43. That is, "by" can switch the tracking servo control based on the reflected light of the servo and the reproducing laser light, and the tracking servo control based on the reflected light of the servo laser. The controller 43 includes, for example, a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), and the like (a memory device). The composition of the microcomputer. The controller 43 performs overall control of the recording device 10 by performing control and processing in accordance with, for example, a program stored in the ROM or the like. For example, the controller 43 realizes switching of the servo control corresponding to the recording/reproduction timing by instructing the relative servo 'reproduced light servo circuit 40, the servo light servo circuit 42, and the switch SW. Specifically, it corresponds to the recording time, and before the tracking drive signal TD-sv for generating the servo light servo circuit 42 is executed, the tracking drive signal TD-sv is selected by the switch SW. The reflected light of the laser light is the tracking servo control of the objective objective lens 23 (that is, the tracking servo control based on the trajectory of the reference 161 999.doc 21 201243841 surface Ref), and corresponds to the reproduction time. Before the tracking drive signal TD-sp of the servo circuit 40 for reproducing light is used, the tracking drive signal TD-sp is selected by the switch SW. Thereby, the tracking servo control of the objective lens 23 based on the reflected light of the servo and reproducing laser light (i.e., the tracking servo control based on the recording mark behavior) is performed. Further, as described above, in the search, the former control is performed by reading the position information of the reference plane, i.e., the tracking control of the objective lens 23 based on the reflected light of the servo laser light. Further, the controller 43 is directed to the servo/reproduced light servo circuit 4, and instructs the interface to be recorded/reproduced, and performs the process of introducing the focus servo for the interface and the focus laser for reproducing the laser. That is, the selection control of the interface of the s recording/reproduction target is implemented. [1 - 4 Specific recording medium configuration and recording and reproducing principle] Here, in the optical recording medium 第 according to the first embodiment, the recording layer 5 and the intermediate layer 4' are specifically used as follows. #, as the recording layer 5, a property in which expansion (thermal expansion) occurs near the light collecting point by irradiation (concentrating) of laser light to be recorded is used. Further, as the intermediate layer 4, those having a Young's modulus lower than that of the recording layer 5 are used. Specific examples of the recording layer 5 having the above properties include a material containing a resin as a main component. More specific examples include: a thermosetting resin (such as an epoxy resin) and a non-linear photoreceptor additive. 2) A non-linear photoreceptor structure is used as a skeleton among the thermosetting resins. 3) A thermoplastic resin (polymerized) Carbonic acid vinegar, etc. + non-linear photoreceptor additive 4) Non-linear photoreceptor structure among thermoplastic resins as a skeleton 161999.doc •22· 201243841 Example 1) Amorphous polyarylate resin as disclosed in Reference 1 below Photon Absorbing Material Example 2) Two photon absorption materials containing a resin as disclosed in Reference 2 below. 5) The above-mentioned 1) to 4) contain an acid generator additive. 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 In the case of the above-mentioned non-linear photoreceptor additive, 4_Ethynyl pA (phthaUc Anhydride: phthalic anhydride) represented by [Chemical Formula 2] is exemplified. [Chemical 1]

[Chemical 2]

When the materials listed are used as the recording layer 5, the materials generated by the vicinity of the condensed point of the laser light and the temperature rise caused by the absorption of the non-linear light are 2 ° and the materials of the above-mentioned υ 5 are listed as having a non-linear shape. The combination of light effects (specially formed to form a mark smaller than the recording beam spot 161999.doc -23· 201243841 effect). Further, as a specific material of the intermediate layer 4, for example, a thermoplastic resin can be cited. More specifically, a polycarbonate resin is mentioned, for example. Fig. 5 is a view for explaining the principle of recording and reproducing of the optical recording medium 第 according to the first embodiment having the laminated structure of the recording layer 5 and the intermediate layer 4 as described above. Fig. 5 is a cross-sectional view showing a portion of the recordable area 7 of the optical recording medium 抽, and Fig. 58 is an enlarged view of the recording mark formed on the upper surface side of the recording layer 5; Fig. 5C is a relative view; An enlarged view of the recording mark formed on the lower surface side of the recording layer 5. As in the above-described embodiment, the recording layer 5 is swollen near the condensed point of the laser light, and the intermediate layer 4 has a lower Young's modulus than the recording layer 5. Therefore, by irradiating the upper surface and the lower surface (i.e., the interface) of the recording layer 5 with the laser beam for concentrating light, the laser beam irradiation portion on the upper surface and the lower surface of the recording layer 5 is irradiated. On the upper side, a deformation which becomes a convex shape toward the outer side of the recording layer 5 is generated. The convexly deformed surface functions as a recording mark. Here, since the intermediate layer 4 and the recording layer 5 have different refractive indices as described above, the interface thereof functions as a reflecting surface. Therefore, in response to the reproduction, when the servo 'reproduction laser light is used to illuminate the interface, the portion of the interface that produces the convex deformation and the other portion of the knife-specific reflection light produce an optical path length difference (phase difference). ). Because of the phase difference of the reflected light, the detector (serving and reproducing light receiving unit 26) generates a level difference between the mark forming portion and the non-formed portion in the reproduced signal RF by the interference of the light wave having the phase difference. That is, as a result, it is possible to perform the mark formation 161999.doc 24· 201243841 Partial/non-formation part judgment, and record (4). At this time, the height of the convex mark is ds, the refractive index of the intermediate layer 4 is η, and the refractive index of the recording layer 5 is N', and the upper surface side of the recording layer 5 is formed. The non-formed optical path length difference D〇, as shown in Figure 2, can be expressed as

Do = n * dsx2 and the optical path length difference Do of the mark forming portion and the non-forming portion on the lower surface side of the recording layer 5, as shown in Fig. 5C, can be expressed as Do = N - cisx2. In the case of BD-R〇M (BD=Blu-ray Disc: registered trademark), the pit depth is about 50 nm, and the optical path length difference between the land and the pit is about 8〇x2 nm. In view of this point, if the optical path length Do which ensures sufficient reproduction signal level (contrast between the mark forming portion and the non-formed portion) is about 100x2 nm, and it is assumed that n and N are each about 1.2 to 15 or so. Within the range, it is estimated that the necessary mark height ds is about 65 nm to 80 nm. Here, in order to form the above-described convex recording mark, the power of the recording laser light is not excessively high. The reason is that if the power of the recording laser light is too high, an empty packet (void) mark is formed. Therefore, the power of the recording laser light of the present embodiment is set to a power corresponding to the characteristic of the recording layer 5 to the extent that the hole mark is formed. In addition, what is to be explained for the sake of confirmation is that the so-called empty hole mark means that one empty bag functions as one recording mark. 161999.doc -25· 201243841 Furthermore, the thickness of the & recording layer 5 and the intermediate layer 4, that is, the distance between the depths of the marks, is intended to suppress crosstalk (and cross light) between adjacent interfaces. Must be certain to some extent. Specifically, the thickness of the recording layer 5 and the intermediate layer 4 is preferably 5 μm or more. Further, regarding the point of suppressing the crosstalk between adjacent layers so that the distance between the layers is 5 μm or more, reference is made to Reference 3 below. • Reference 3. “K. Saito and S. Kobayashi: “Analysis of cro Reflector 3-D optical disc recording j Proc. of SPIE,

Vol.6282, 2007. In addition, regarding the thickness of the intermediate layer 4 formed at the uppermost and lowermost portions, it is intended to record the mark on only one side thereof, and it is possible to exclude the setting target of the thickness of the crosstalk. outer. Further, as described above, the temperature rise deformation caused by the absorption of the nonlinear light forms a record. In the case of the ridge shape, gp, when the recording layer 5 absorbs light to cause deformation due to heat generation, in order to obtain more excellent recording characteristics (regeneration characteristics), it is desirable that the concentrating point and interface of the laser light for recording are not made. It is uniform, and the self-interface is shifted to some extent toward the inner side of the recording layer 5. In this case, the recording device ίο may be configured to give a specific amount of offset with respect to the focused vocal circuit based on the focus error signal FE_sp. As a specific configuration example, an adder can be inserted on the line of the focus error signal anode SP supplied to the servo/reproducing optical servo circuit 4, and the adder is added with a specific offset to the focus error signal FE-sp. value. Further, the transmittance of the interface between the recording layer 5 and the intermediate layer 4 is intended to prevent absorption or scattering caused by the recording marks, and it is desirable to have a large transmittance. 161999.doc •26- 201243841 [1-5. Effect] The previously used gap recording method, as described above, the reading (reproduction) of the recording signal is to detect the difference between the reflectance of the formed portion and the non-formed portion of the void. The way to implement it. Specifically, the void recording method is, for example, carried out by laser beam irradiation at a higher power than the capacity layer 1 2 ( FIG. 17 ) composed of a recording material such as a photopolymerizable photopolymer, in the above-described capacity layer 1 〇 2 The method of recording empty packets. As disclosed in Patent Document 2, the thus formed empty portion becomes a portion in which the refractive index is different from the other portions in the capacity layer 1〇2, and the reflectance of light at the boundary portion thereof is improved. Therefore, the above-mentioned empty packet portion functions as a recording mark, thereby realizing the formation of the information record of the empty packet mark. The gap recording method ' increases the size of the gap to increase the reflectance, so that the reproduction signal level can be raised. However, the improvement of the signal levels is considered to be a trade-off relationship with the suppression of the crosstalk in the depth direction when it is considered to perform, for example, a ten-layer or a tens of layers of recording as a multi-layer recording. Fig. 18 is an explanatory diagram of crosstalk in the depth direction. When the reproduction is performed as shown in the recording position (the recording position in the layer direction, hereinafter referred to as the layer position), the reflected light from the gaps of the other layer positions leaks to the detector. Incurred S/N deterioration. Rong is seeking to prevent the disturbance of the depth direction. The reflectivity of the gaps in each recording position is small, and the gap size is also small. In the case of the Z-recording method, if the gap size is increased in order to increase the signal level, the crosstalk in the depth direction becomes larger, and the s/n is deteriorated. Conversely, if the gap size is reduced and crosstalk is suppressed, the signal level is reduced and the S/Ν is degraded. Further, when the gap size is increased, the transmittance of the gap is lowered accordingly, so that the recording position on the lower layer side is present, which is more disadvantageous for signal regeneration. As far as the above is concerned, the line recording method is very difficult to adjust to the appropriate S/Ν problem. Further, as another problem, a void mark is formed as a recording mark by the gap recording method, so that a relatively high laser power is required when forming a mark. Specifically, in order to form a hole mark, it is necessary to concentrate a relatively high power in a short period of time, and there is also a problem that a large-sized device capable of realizing high output is required as a light source for recording a laser. On the other hand, in the recording apparatus of the present embodiment, an optical recording medium having a plurality of interfaces by alternately stacking the first layer and the second layer is provided and used. According to the above configuration, by making the refractive index of the second layer and the second layer different, the interface can function as a reflecting surface, and in the vicinity of each interface that functions as a reflecting surface in this manner, When the recording mark due to the modulation of the refractive index or the deformation of the interface is formed as described above, the optical path length difference (phase difference) of the reflected light generated by the mark forming portion and the other portion can be used to form the presence or absence of the mark (recording signal). Determination of regeneration). That is, signal reproduction of the so-called phase difference detection can be performed. In addition, since the phase difference is detected, the phase difference between the mark forming portion and the non-formed portion can be appropriately set in order to increase the level of the reproduced signal (the optical path length difference is specific. When the phase difference is one-half wavelength of the wavelength of the reproducing light and the case of the phase difference detection, the level of the reproduced signal is raised and s ' can also be used to reproduce the mark forming portion and the non-forming portion in the spot. *61999.doc • 28· 201243841 Proper correction of the occupied area. It may not be necessary to record the gap.

The state of affairs. That is, even at this point, it is easier to adjust to an appropriately correct S/Ν. In the case of the phase difference detection, the reflectance, the target signal level, and the suppression depth direction of the mark portion are increased as described above. As a method for realizing multi-layer recording and reproduction, a plurality of first layers and second layers are provided. The structure of the interface of the layer (specifically, the structure of the first layer and the second layer is alternately overlapped), and the interface of the layer is given a deformation which does not form a blank mark and is used as a recording mark. By this, signal regeneration of so-called phase difference detection can be realized. Therefore, it is possible to avoid the relationship between the regenerative signal level and the suppression of the crosstalk in the depth direction, which is easier to adjust to the appropriate correct S/N than the previous gap recording method. Furthermore, it is not necessary to increase the reflectance of the mark (the same as the reflectance of the difference in refractive index between the first layer and the second layer) or the mark size when the reproduced signal level is raised as described above, so that the gap recording mode can be effectively avoided. At the time of raising and replacing the reproduction signal level, the amount of transmitted light on the layer side under the multilayer recording is reduced. That is, 'even if it is', it can be more easily adjusted to the appropriate correct S/Ν 〇161999.doc -29- 201243841 and then 'recording laser power can also contribute to at least deformation or qualitative change near the interface (refractive index The power of the degree is changed without the need to form a high power of empty packets (voids). Therefore, the laser beam for recording can be a device which is smaller than the case of the gap recording method, and as a result, the size of the recording device 10 can be reduced, and the power consumption can be reduced. Furthermore, since the interface is recorded as an object, the intermediate layer/recording layer required for realizing the same s recording capacity can be laminated in comparison with the case where i-layer recording is performed for each recording layer of the current multilayer recording medium. The number of times is suppressed by half. As a result, the process required for manufacturing the optical recording medium can be reduced, and the manufacturing cost of the optical recording medium 1 can be reduced. <2. Second Embodiment> Fig. 6 is a cross-sectional structural view of an optical recording medium 45 as a second embodiment. In the following description, the same reference numerals are used to omit the description. The optical recording medium 45 of the second embodiment is the same as the optical recording medium 1 of the first embodiment except that the recording layer 46 is provided instead of the recording layer 5. The recording layer 46 has a property of producing a refractive index change in the vicinity of the condensed point of the laser light. Specifically, the recording layer 46 in this case has a property of changing the refractive index of the formation of "loose" (loosely) in the vicinity of the condensed point of the laser light. Here, "loose" means a state in which a large number of extremely small bubbles are formed. In addition, for the sake of confirmation, it is to be noted that, as described above, the empty hole mark is one empty package, and the one record mark is 'song', which is a collection of extremely small bubbles (empty packets). The mark contains a lot of bubbles. 161999.doc -30· 201243841 As an example of a material in which the aggregate of extremely small bubbles as "song" is formed, the material which is exemplified in the first embodiment is 5) (having a non-linear photoreceptivity) Resin, material containing acid generator added). The intermediate layer 4 uses a material having a lower Young's modulus than the recording layer 46. Specific examples of the material include the same thermoplastic materials as those exemplified in the embodiment. The intermediate layer 4 and the recording layer 46 have different refractive indices, and in this case, the interfaces thereof also function as a reflecting surface. Fig. 7 is a view for explaining the principle of recording and reproducing of the optical recording medium cartridge of the second embodiment. Similarly to the case of Fig. 5, Fig. 7A is a cross-sectional view showing a portion of the recordable area 7 of the optical recording medium 45, which is shown in a schematic manner; and Fig. 7B is a recording mark formed on the upper surface side of the recording layer 46. Magnified view. Fig. 7C shows an enlarged view of the recording mark formed on the lower surface side of the recording layer 46. According to the optical recording medium 45 of the second embodiment, the recording operation is performed on the upper surface and the lower surface of the recording layer 46, and the recording operation is performed on the upper surface of the recording layer 46. In the vicinity of the portion irradiated with the laser light on the lower surface, a shape change toward the outer side of the recording layer 46 due to thermal expansion occurs. Further, in the vicinity of the condensing point of the laser light in the recording layer 46, a refractive index modulation portion as "loose" is formed. That is, a convex deformation mark accompanying "loose" is formed. When the recording layer 46 is composed of the material of the above 5), when the laser light of a certain power or more is concentrated, the cation (acid) is generated from the addition of the sword due to the chemical reaction in the vicinity of the laser light collecting point of the recording layer 46. Here, gas is generated by inducing decomposition of the structure of the surrounding 161999.doc 31 201243841. The above-mentioned looseness is formed by the generation of this gas. In this case, it is considered that if the properties of the base material are relatively hard, it is possible to appropriately suppress the modality in which the gas is one large empty bag, and form an aggregate of extremely small bubbles (i.e., "loose"). In this regard, the material of the above 5) is suitable for the formation of "loose" „the use of the material of the above 5), and is the mark of only the interface deformation as in the i-th embodiment, or the second embodiment The deformation mark associated with "loose" is determined by the power setting of the laser light for recording. That is, the configuration f of the recording layer constituting the material of the above 5) is that only the deformation is caused by the low-power laser light irradiation, and the high-power laser light irradiation produces the refractive index modulation. The lower record is recorded with laser light. As a result, the recording mark of the interface deformation can be formed as in the first embodiment. Further, if the recording of the laser light for recording with high power is performed, the deformation mark containing "loose" as in the second embodiment can be formed. The deformation mark associated with the refractive index modulation portion is such that the height of the convex deformation portion of the interface is ds, the refractive index of the intermediate layer 4 is n, and the refractive index of the recording layer is N'l, which is set as the "song". The height and the refractive index of the refractive index modulation portion of the formed portion are dm, Ν, β, respectively, in this case, the optical path length difference D〇 between the mark forming portion and the non-forming portion on the upper surface side of the recording layer 46, as shown in the figure 7Β, can be expressed as

Do = n»ds χ2, and the optical path length difference Do of the mark forming portion and the non-forming portion on the lower surface side of the recording layer 46, as shown in Fig. 7C, can be expressed as Do = {(N'-N).dm -N.ds}x2. I61999.doc • 32-201243841 The refractive index modulation portion becomes the portion where the refractive index is lower than the recording layer 46 where the other portion of the "loose" is lowered. In other words, the refractive index modulation portion of 35 "loose" is a collection of extremely small bubbles (i.e., a refractive index of approximately 1 G). Therefore, when viewed as a whole, it functions as a portion where the refractive index is lowered. According to this point, the formula of the lower side of the above two equations is the relationship of ν·<ν. That is, "(N, -N).dm" is a negative value. Further, even in the second embodiment, the power of the recording laser light is set to a power level which does not form a hole mark in accordance with the characteristics of the recording layer 46. Further, even in the second embodiment, it is preferable that the thickness of the intermediate layer 4 and the recording layer 最低 is 5 or more as in the case of the i-th embodiment. Further, in the second embodiment, the second embodiment is not linear. The case where the temperature rise due to light absorption is deformed to form a recording mark 'does not make the light collecting point of the recording laser light coincide with the interface, and is shifted to some extent from the interface toward the recording layer 46 side, which is excellent in obtaining The recording characteristics (regeneration characteristics) are also ideal. In the above description, the case where the "loose" is formed as the refractive index modulation portion, that is, the It-shaped portion of the refractive index modulation portion knife which exhibits a decrease in the refractive index is formed, but the refractive index modulation portion may be used. To show the rise in refractive index. It is relatively easy to produce a shape deformer as a resin. As an example of a material which generates an increase in refractive index in the vicinity of the condensed point of the laser light, a material which causes coloring in the vicinity of the condensed point of the laser light can be cited. As a specific example thereof, the materials of the above 1) to 4) can be cited. Further, the above enumeration of 1) to 4) as described above is intended to mainly produce various combinations of the shape-light absorption of the non-linear 161999.doc •33·201243841. In the case of using the materials of the above 1) to 4), as in the case of the material of the above 5), the following configuration can be used to form only the interface deformation, or the refractive index modulation and the interface deformation. The mark of the record. That is, the recording layer is configured to have the following lower laser light irradiation to cause only deformation, and the lightning corresponding to the higher power: the light is generated to produce a refractive index modulation. Thereby, by performing the recording of the laser light for recording with low power described above, it is possible to form the recording mark of only the interface deformation as in the first embodiment. Further, when high-power recording of the laser light for recording is performed, the recording marks accompanying both the refractive index modulation portion and the interface deformation are formed as in the second embodiment. <3. Third Embodiment> Fig. 8 is a view showing a cross-sectional configuration of an optical recording medium 5A according to the third embodiment. The optical recording medium 5 of the third embodiment differs from the optical recording medium 45 of the second embodiment in that the intermediate layer 5 is provided instead of the intermediate layer 4. The intermediate layer 51 has a higher Young's modulus than the recording layer 46. As the recording layer 46, as in the second embodiment, a property having a property of changing the refractive index in the vicinity of the condensed point of the laser light is used. The intermediate layer 51 and the recording layer 46 have different refractive indices, and in this case, the interfaces thereof also function as reflecting surfaces. Fig. 9 is a view for explaining the principle of recording and reproducing of the optical recording medium 5 of the third embodiment. The recording operation is preferably performed on the upper surface and the lower surface of the recording layer 46, and the recording operation is preferably performed by collecting the laser light. As shown in Fig. 9A, the deformation of the upper surface and the lower surface of the recording layer 46 is substantially not generated. The vicinity of the upper surface and the lower surface of the recording layer 46 is a portion near the condensed point of the laser light, and a refractive index modulation portion is formed. In the present embodiment, since the Young's modulus of the intermediate layer 5 1 is relatively high, the interface deformation of the recording layer 46 is suppressed, and the interface can be deformed by the Young's modulus of the intermediate layer 51. The suppression is 0. In this case, since the recording layer 46 is the same as that in the case of the second embodiment, a refractive index modulation portion is formed in the vicinity of the light-converging point of the laser light of the recording layer 46. As described above, in the third embodiment, the refractive index modulation mark without the surface deformation (substantially approximately 〇) can be formed on the upper surface and the lower surface ′ of the recording layer 46. Here, Fig. 9B is an enlarged view showing the mark formed on the upper surface side of the recording layer 46, and the mark on the upper surface side, the side edge surface indicated by R in the figure functions as a reflecting surface. That is, since the refractive index of the upper and lower sides is different depending on the edge surface r, the edge surface R functions as a reflecting surface. In this case, the reflected light of the mark forming portion is guided to the detector by a component which is reflected by the reflecting surface of the upper surface of the recording layer 46 and a component which is reflected by the edge surface. At this time, the reflected light from the mark non-formed portion on the upper surface of the recording layer 46 and the reflected light from the above-described edge surface R generate a phase difference corresponding to the mark height dm. From this, it can also be understood that even in this case, the mark forming portion and the non-formed portion generate a difference in the detected intensity of the reflected light, that is, the level difference of the reproduced signal RF, whereby the determination of the recording symbol can be performed. On the other hand, Fig. 9C shows an enlarged view of the mark formed on the lower surface side of the recording layer 46, as shown by the mark on the side of the underground surface, if the recording layer "refractive index is N, mark (refractive index modulation portion)" The height is such that the refractive index of the mark is N 'the optical path length difference Do between the mark forming portion and the non-forming portion on the lower surface side, which can be expressed as: 161999.doc •35· 201243841

The lower surface side of Do = (N' - N) * dmx2 is determined based on the phase difference between the reflected light of the mark forming portion and the non-formed portion 8 thus generated. Further, even if the mark portion on the lower surface side functions as a reflecting surface due to the edge surface of the mark (in this case, the upper side edge surface), the mark forming portion and the (four) portion of the lower surface are strictly closed. The reflected light detection intensity difference 'this reflected light component from the edge surface also contributes. Further, the case where the reflected light from the edge surface of the refractive index modulation portion contributes to the difference in reflected light detection intensity between the mark forming portion and the non-formed portion is also in the second embodiment (Fig. 7B, Fig. 7C). The situation is the same. Here, as the material of the recording layer 46 in this case, any material which exhibits a decrease in the refractive index due to the formation of "loose" and a material which exhibits an increase in the refractive index due to coloring or the like may be used. It is also understood from the above description that, in either case, the difference in the detection intensity difference between the phase difference of the reflected light of the mark forming portion and the non-formed portion can be obtained. That is, the case where the determination of the recording symbol can be performed does not change. Further, even in the third embodiment, the power of the recording laser light is set to a power level that does not form a hole mark in accordance with the characteristic of the recording layer. Further, even in the third embodiment, the point that the thickness of the intermediate layer 51 and the recording layer 46 is at least 5 μηι or less is the same as in the previous embodiments. <4. Fourth Embodiment> Fig. 10 is a view showing a cross-sectional configuration of an optical recording medium 55 according to the fourth embodiment. In the optical recording medium 55 of the fourth embodiment, the lower layer 161999.doc-36-201243841 of the selective reflection film 3 is provided with an adhesive layer (intermediate layer) 56; and the lower layer of the adhesive layer 56 is formed with (subsequently) as The recording layer 57 of the recording area 7 and the recording layer are covered by the laminated layer structure. In this case, the adhesive layer 56 may be composed of a thermoplastic resin such as an ultraviolet ray hardening tree. Further, in this case, the number of times of overlapping the recording layer 57 and the recording layer 46 in the recordable region 7 is X times as in the previous embodiments. The recording layer 57 is formed of a material having a refractive index change in the vicinity of the condensed point of the laser light, similarly to the recording layer 46, but the refractive index of the recording layer 57 is different from that of the recording layer 46. That is, the interface between the recording layer "and the recording layer 46 functions as a reflecting surface, and the Young's modulus of the recording layer is set lower than that of the recording layer 46. Fig. 11 is for the optical recording medium 55 of the fourth embodiment. A diagram for explaining the principle of recording and reproducing. In this case, the recording layer 46 (or the upper surface and the lower surface of the recording layer (7) is used as a target for performing a recording operation for collecting laser light, as shown in FIG. A refractive index modulation portion is formed on both sides of the layer 46 and the recording layer 57. That is, a refractive index modulation is formed in the vicinity of the upper surface and the lower surface of the recording layer 46, that is, across the portion of the recording layer 46 and the recording layer 57. Specifically, the vicinity of the upper surface and the lower surface of the recording layer in the recording layer 46 becomes a portion near the light collecting point of the laser light, and the upper surface of the recording layer 46 in the recording layer 57. And the vicinity of each of the lower surface (in other words, the surface S and the upper surface below the recording layer 57) which becomes a portion near the condensed point of the laser light is formed with a refractive index modulating portion. And in this case, the recording layer is set. 57 Young's Coefficient The recording layer ^ is low, so as shown in the figure near the spot of the laser light, the upper surface and the lower surface of the recording layer 46 are also produced on the outer side of the recording (4). 161999.doc •37·201243841 Here, as shown in Fig. 11B and lie, respectively, the refractive index of the recording layer 46 is N, the refractive index of the recording layer 57 is n, and the refractive index of the refractive index modulation portion formed on the side of the recording layer In other words, the refractive index of the refractive index modulation portion formed on the side of the recording layer 57 is η, and further, the height of the portion of the refractive index modulation portion which is located on the upper side than the vertex of the convex portion of the convex surface is dm. In this case, the optical path length difference Do between the mark forming portion and the non-forming portion on the upper surface side of the recording layer 46 is as shown in Fig. 11B and can be expressed as: D 〇 = {(n'-n) - dm +n*ds} χ2 and 'the optical path length difference Do of the mark forming portion and the non-forming portion on the lower surface side of the recording layer 46, as shown in Fig. 11C, can be expressed as D 〇 = {(N, -N) .dm-N.ds}x2 In the same case, the edge of the refractive index modulation portion is the same as the previous image. The surface functions. Therefore, in this case, the signal level difference between the mark forming portion and the non-formed portion of the upper surface and the lower surface of the s recording layer 46 is the reflected light component from the edge surface. Further, even in the fourth embodiment, the power of the laser light for recording is set to a power level that does not form a hole mark according to the characteristics of the »recording layers 46 and 57. Further, even in the fourth embodiment In the case of the optical recording medium 55 of the fourth embodiment, it is known that the intermediate layer 5 丨 and the recording layer 46 have a thickness of at least 5 μm or less. • 38 201243841 For the number of times of reversal stacking X, the number of recordable interfaces can also be 2x. In other words, even in the fourth embodiment, as in the case of the previous embodiments, the number of times of the overlying optical recording medium required to achieve the same recording capacity can be reduced to that of the multilayer optical recording medium in which the W recording is performed every previous recording layer. One and a half. Further, for the sake of confirmation, it is to be noted that the conventional multilayer optical recording medium is a reverse layer of the intermediate layer/recording layer/intermediate layer. <5. Fifth Embodiment> Fig. 12 is a cross-sectional structural view of an optical recording medium 6A according to the fifth embodiment. The optical recording medium 60 of the tenth embodiment is different from the optical recording medium 55 of the fourth embodiment in that a recording layer 61 is provided instead of the recording layer 46, and the dots of the recording layer 62 are provided instead of the recording layer 57. The recording layer 6A and the recording layer 62 are configured to have a refractive index modulation property in a relatively low temperature state before the interface deformation due to thermal expansion of the laser light irradiation. Further, the refractive indices of the recording layer 61 and the recording layer 62 are different from each other. Fig. 13 is a view for explaining the principle of recording and reproducing of the optical recording medium 6 of the fifth embodiment. In the optical recording medium 6 of the fifth embodiment, the upper surface and the lower surface of the δ recording layer 61 (or the recording layer 62) are applied, and the recording operation is preferably performed by collecting the laser light. In this case, as shown in FIG. 3A, the portion near the upper surface and the lower surface of the recording layer 61 in the recording layer 61 becomes a portion near the condensed point of the laser light, and becomes a recording layer. A portion of the upper surface and the lower surface of the recording layer 61 (i.e., the upper surface and the lower surface of the recording layer 62) is a portion near the condensed point of the laser light, and a refractive index modulation portion is formed. At this time, as described above, the recording layer 61 and the recording layer 62 are composed of a material having a refractive index which is refracted at a lower temperature state before the occurrence of the interface deformation, so that the interface deformation as shown in the figure does not occur. (Approx. 〇). In other words, by setting the power of the recording laser light to a power level at which no interface deformation occurs, a refractive index modulation flag which is not accompanied by interface deformation (the interface deformation is substantially 〇) can be formed. Further, when a dye-based recording material such as a DVD (Digital Versatile Disc) is used as the material of the recording layer, it is confirmed that the refractive index is generated before the interface deformation occurs when the power of the laser light is increased. Modulation. That is, the refractive index modulation is generated at a lower temperature state before the interface deformation occurs. In this case, the optical path length difference of the reflected light of the mark forming portion and the non-formed portion on the upper surface side of the recording layer 61 (i.e., the lower surface side of the recording layer 62) is set such that the refractive index of the recording layer 62 is η. The height of the refractive index modulation portion formed on the recording layer 62 side and the refractive index thereof are dm and η', respectively, as shown in FIG. 13A, which can be expressed as:

Do = (n'-n)*dmx2, and the optical path length difference Do of the mark forming portion and the non-forming portion on the lower surface side of the recording layer 61 (i.e., the upper surface side of the recording layer 62) is set to the recording layer 61. The refractive index is N, and the height of the refractive index modulation portion formed on the side of the recording layer 61 and its refractive index are respectively dm, Ν' ' as shown in FIG. 13C, which can be expressed as.

Do=(N'-N)*dm><2 In this case, the 'marked edge surface also functions as a reflecting surface, and strictly speaking, the signal level difference between the mark forming portion and the non-formed portion, the origin The case where the reflected light component of the surface also contributes is the same as in the case of the second to fourth embodiments. Further, in the fifth embodiment, it is desirable to make the thicknesses of the recording layers 61 and 62 at least 5 μηι or more in the same manner as in the previous embodiments. Here, in the above description, as a specific method for preventing the deformation of the interface, a method of forming the material-layered recording layers 61, 62 in which the refractive index is modulated in a lower temperature state before the interface deformation occurs is exemplified. As a method for preventing the deformation of the interface, a method of forming a laminated structure in which the recording layer is applied from the up-and-down direction may be employed. In this case, the optical recording medium after the formation is caused by the mutual adhesion force between the recording layers in the lamination direction, so that the interface deformation can be suppressed accordingly. <6. Sixth Embodiment> Fig. 14 is a view showing a cross-sectional configuration of an optical recording medium 65 according to a sixth embodiment. The optical recording medium 65 is replaced with an optical recording medium of the seventh embodiment. The intermediate layer 66 is provided with the interlayer 4, and the dots of the recording layer 67 are provided instead of the recording layer. The recording layer 67 uses a material having a property corresponding to the heating line in the vicinity of the condensing point corresponding to the irradiation of the laser light for recording. This corresponds to a recording material based on a general thermoplastic resin having a glass transition temperature as described in the material of 3). Moreover, the ten layers 66 use those having a Young's coefficient higher than that of the recording layer. At this time, the refractive indices of the intermediate layer 66 and the recording layer 67 are different from each other. Therefore, the optical recording medium 65 in this case is a laminated structure formed by the intermediate layer "and the recording (4), and is pressed in a state of being pressed from the up-and-down direction, that is, the formed optical recording medium 65 is attached to the intermediate layer 66. Fig. 15 is a view showing the principle of the recording and reproduction of the optical recording medium of the sixth embodiment, which is described in the principle of recording and reproducing 161999.doc 201243841, the optical recording medium 60 of the above configuration. With respect to the upper surface and the lower surface of the recording layer 67, a recording mark is formed by collecting a suitable laser light, thereby specifically forming a recording mark on the upper surface of the recording layer 67 as shown in FIG. And the lower surface is formed with a mark in which the shape of the upper surface and the lower surface is convexly deformed toward the inner side of the recording layer 67 (hereinafter referred to as a concave deformation mark). The description of the previous FIG. 4 can also be understood. In this case, the intermediate layer 66 is made of a hard material and is in a state of being pressurized in the lamination direction. Since then, the upper surface and the lower surface of the recording layer 67 are used for collecting the laser light, and recording is performed. Layer 67 The heating (melting) occurs in the vicinity of the condensing point, and the portion near the condensing point of the laser light of the intermediate layer 66 in the above-mentioned pressurized state is convexly bulged toward the recording layer 67 side. As a result, the concave deformation marks of the above-mentioned figures are formed. Further, it is considered that a part of the formation of the concave deformation marks is also contributed by the thermal expansion generated near the spot of the laser light of the intermediate layer 66. In this case, recording The optical path length difference D of the reflected light on the upper surface side of the layer 67 and the non-formed portion is as shown in Fig. 15B. If the refractive index of the intermediate layer 66 is n, the refractive index of the recording layer 67 is N, the height of the concave deformation mark is ds, which can be expressed as:

Do = n»dsx2, and the optical path length difference D of the reflected light of the mark forming portion on the lower surface side of the recording layer 67 and the non-formed portion can be expressed as:

Do=N.dsx2. Referring to these equations, it is also known that in this case, the determination of the recording symbol based on the phase difference between the reflected light of the mark forming portion and the non-formed portion can be performed. 161999.doc •42·201243841 Further, even in the sixth embodiment, the power of the recording laser light is set to a power level that does not form a hole mark in accordance with the characteristics of the recording layer 67. Further, even in the sixth embodiment, the point that the thickness of the intermediate layer 66 and the recording layer "5 μm or less is the same as in the previous embodiments is the same as in the previous embodiments. Further, even in the sixth embodiment, In the case of the second embodiment and the second embodiment, the recording mark is formed by the temperature rise deformation of the nonlinear light absorption, and the light-converging point of the recording laser light is not matched with the interface, but is formed from the interface toward the recording layer 67 side. In this way, it is preferable to obtain excellent recording characteristics (reproduction characteristics). <7. Modifications> Although the embodiments of the present technology have been described above, the present technology is not limited thereto. Specific examples have been described. For example, in order to make the interface of the recording layer function as a reflecting surface (that is, to effectively obtain the refractive index difference of the interface), it is also possible to apply, for example, a plasma or an ion beam to the interface of the recording layer. Surface treatment (modification processing, in addition to the first to sixth embodiments described above, the interface between the second layer and the second layer having a plurality of mutually different refractive indices is formed as an optical recording medium. In the structural example, the structure of the layer in which the refractive indices of the alternately laminated layers are different from each other is exemplified, but the structure having the interface may be, for example, a structure as shown in Fig. 16 8. That is, the refractive indices of the reversed laminates are the same. The laminated structure of the layer 71 (FIG. 16B) is formed by the refractive index modulation layer shown in FIG. 6A by applying a refractive index modulation process to the upper portion and the lower portion of the interface. The structure of the refractive index modulation layer 71B. In this case, the refractive index modulation processing is performed by applying a refractive index difference to the refractive index modulation layer 7. For example, according to the above: The boundary between the isotropic refractive index modulation layer 71A and the refractive index modulation layer 71B is prepared as "the interface between the i-th layer and the second layer having different refractive indices." The layer 71 having the same refractive index may be a combination of the recording layer and the intermediate layer as described in the first to sixth embodiments, or a combination of only the recording layers. The meaning of the interface of layers that differ from each other in refractive index is that The refractive index modulation treatment may be performed by forming at least one of the refractive index modulation layer 71A or the refractive index modulation layer 71B. That is, if the refractive index modulation processing is performed, for example, only refractive is formed. On the side of the rate modulation layer 71A, the upper surface of the refractive index modulation layer 71A functions as an interface. Further, when the refractive index modulation layer 71B side is formed, the lower surface functions as an "interface". According to the modification described above with reference to Fig. 16, in the manufacturing process of the optical recording medium, it is suitable to be in the case of the following cases, and it is preferable that the materials of the layers used in the laminating step are homogeneous (refractive index is not different). Further, in the present technology, the refractive indices of the first layer and the second layer are not necessarily different. Even when the refractive indices of the first layer and the second layer are the same, for example, the third to the fifth In the case of forming a mark using refractive index modulation such as looseness or coloring as in the embodiment, the relationship between the reflectance of the mark portion and the transmittance may be different from the case of performing the previous gap recording. That is, as a result, the reflectance of the mark portion can be ensured to the extent required for reproduction, and the transmittance of the mark portion can be made higher than in the case of performing void recording. Accordingly, compared with the clear shape of the gap record 161999.doc -44·201243841, it is possible to alleviate the crosstalk between the regenerative signal level and the suppression of the depth direction as a trade-off relationship, and as a result, it can be more easily adjusted to an appropriate correct S. / Ν Ν tendency. Further, in the above-described first to sixth embodiments, the reference plane Ref is provided on the upper side of the recordable area 7, but the reference plane Ref may be provided on the lower side of the recordable area 7. When the reference plane Ref is disposed on the lower side of the recordable area 7, as the reflection film provided with respect to the reference surface Ref, it is desirable that the installation characteristics are opposite to that of the selective reflection film 3, that is, selectively reflecting only the servo thunder In the case of the selective reflection film having such a characteristic, it is possible to effectively suppress the stray light during reproduction (caused by reflected light from a layer position other than the layer position to be reproduced). Further, for example, in the sense of tracking servo control for recording laser light based on the reflected light of the servo 'reproduction laser light, it may be formed on the upper surface and the lower surface of the i-th layer (or the second layer), respectively. As a guide groove for the groove. In this case, the recording mark can be formed on the groove (recess), the land (protrusion), or both of them. Thus, a groove is formed on the interface, and tracking servo control of the laser light for recording is performed based on the groove (track). Thereby, compared with the case where the tracking laser light for recording laser light is used by the reflected light of the servo laser light from the reference surface Ref as described above with reference to FIGS. 2 and 3, the laser light for recording can be improved. The reliability of the servo. However, if the configuration of the tracking servo control for the laser light for recording using the reflected light from the servo laser light from the reference surface Ref described above with reference to FIGS. 2 and 3 is employed, it is not necessary to form a groove on all surfaces. In terms of the groove, it is possible to simplify the manufacturing process of the optical recording medium. Thus, it is possible to reduce the manufacturing cost of the optical recording medium 161999.doc.45-201243841. Furthermore, the above! ~ The sixth embodiment is exemplified by the control of the focus feeding device for feeding the laser light by controlling the objective lens to extract the actuator, and the focus control of the feeding light for the feeding and reproducing is controlled by the control insertion. The recording/reproducing light in the optical path of the servo laser light is implemented by a focusing mechanism, but is not limited thereto. For example, the focus feeding control of each laser light can also be realized by the following method: the focus servo control of the laser light for the service and reproduction, the 2-axis actuator 24 based on the focus error signal FE_sp, and the focus servo of the servo laser light. The control unit additionally inserts a focusing mechanism (for example, the same configuration as the recording and reproducing light focusing mechanism) in the optical path of the servo laser light, and controls the focusing mechanism based on the focus error signal FE-sv. Further, in the above-described first to third embodiments, the guide grooves forming the grooves or the pits are exemplified as the clear shape of the position guide formed on the reference surface Ref, but the position guide may be used as the position guide. It is formed, for example, by recording a mark on a phase change film. Further, in the above-described first to sixth embodiments, the optical recording medium of the present invention is a disk-shaped recording medium, but may be, for example, a rectangular shape or another shape β. The present technology may be as follows (1) ) The composition shown in ~(15). (1) A recording apparatus that converges laser light in the vicinity of the interface of an optical recording medium having a structure in which a plurality of interfaces of a first layer and a second layer are formed, and is formed in the vicinity of the interface A recording mark is formed which is formed with an empty packet and accompanied by a modulation of the refractive index of 161999.doc -46 · 201243841 and/or a change in the shape of the above interface. (2) The recording apparatus according to (1) above, wherein the refractive index of the second layer and the second layer are different. (3) The recording apparatus according to (1) or (2) above, wherein the first layer is configured to expand in a vicinity of a condensing point of the laser light; and the Young's coefficient of the second layer is set to be higher than The second layer is low; and a recording mark which does not form the recording mark of the empty mark is formed on the interface, and is a shape change of the interface caused by the aspect of the second layer side protrusion. (4) The recording apparatus according to (3) above, wherein the second layer is configured to generate the expansion and the refractive index in response to the power of the laser light; and is formed in the vicinity of the interface The recording mark of the empty mark is a recording mark which is changed in accordance with the modulation of the refractive index and the shape change of the interface caused by the protrusion on the second layer side. (5) The recording device according to the above (1) or (7), wherein the first layer is configured to generate a modulation of the refractive index in the vicinity of a condensing point of the laser light; and the Young's modulus of the second layer is set. It is higher than the above-mentioned second layer; and in the vicinity of the above-mentioned interface, a recording mark which is not caused by the formation of the above-mentioned empty package mark 161999.doc •47·201243841 is formed, and is a refractive index modulation. (6) The recording device according to (1) or (2) above, wherein the ith layer and the second layer are configured to generate a refractive index modulation near a condensing point of the laser light; and the interface is A portion of the knives that are adjacent to the second layer and the second layer are formed so as not to form a recording mark of the empty mark, and are recorded with the refractive index. (7) The recording apparatus according to (6) above, wherein the Young's coefficient of the second layer is set lower than the first layer; and in the vicinity of the interface, a recording mark that does not form the empty mark is formed, and is accompanied by The shape of the interface due to the second layer side &amp; aspect change and a recording mark accompanying the modulation portion of the refractive index across a portion of the second layer and the second layer. (8) The recording apparatus according to (6) above, wherein the first layer is configured to generate the modulation of the refractive index in a lower temperature state before the deformation of the interface corresponding to the thermal expansion of the irradiation of the laser light is generated; or The multilayer structure of the first layer and the second layer is formed in a state of being pressurized from the vertical direction, and the portion adjacent to the first layer and the second layer is formed in the vicinity of the interface. The recording mark of the empty package mark 'and the recording mark caused by the modulation of the above refractive index. I6l999.doc •48· 201243841

The recording device according to the above (1) or (2), wherein the second layer is configured to generate melting corresponding to the heating in response to the irradiation of the laser light in the vicinity of the light collecting point; and the Young's modulus of the second layer is set to be The first layer is formed in a state in which the first layer and the second layer are formed in a state of being pressed from the vertical direction; and the recording mark on the interface is formed so as not to form the empty mark. The recording mark of the shape change of the interface caused by the convex portion on the side of the first layer. (10) The recording apparatus according to (1) or (2) or (4) to (8) above, wherein the modulation of the refractive index is imparted by the formation of a pine. (A) The recording apparatus according to the above (1) or (2) or (4) to (8), wherein the refractive index is modulated by coloring. (12) The recording apparatus of the above (7) to (1)) includes a focus servo control unit that performs focus servo control of the laser light based on a result of detecting reflected light from the interface. (13) A recording method for concentrating laser light in the vicinity of the interface of an optical recording medium having a structure in which a plurality of interfaces of the first layer and the second layer are formed, and forming a vicinity of the interface Recording marks to the formation of empty packets and accompanying the modulation of the refractive index of 161999.doc -49·201243841 and/or the shape change of the above interface. (14) An optical recording medium having a structure in which a plurality of first layers and a first interface are formed; and in the vicinity of the interface, formation of a void mark is not formed and the refractive index is modulated and/or the interface is The record mark of the shape change. (15) The optical recording medium of the above (14) wherein the interval between the interfaces is 5 μη or more. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a cross-sectional structural circle of an optical recording medium according to a first embodiment. Fig. 2 is a view for explaining a servo control method of an optical recording medium according to an embodiment. Fig. 3 is a view mainly showing the internal configuration of an optical system included in the recording apparatus of the embodiment. Fig. 4 is a view showing an internal configuration of a recording apparatus of the embodiment. Fig. 5 is a view for explaining the principle of recording and reproducing of the optical recording medium of the first embodiment. Fig. 6 is a cross-sectional structural view showing an optical recording medium according to a second embodiment. Figs. 7A-C are views for explaining the principle of recording and reproducing of the optical recording medium of the second embodiment. Fig. 8 is a cross-sectional structural view showing an optical recording medium according to a third embodiment. Figs. 9A-C are views for explaining the principle of recording and reproducing of the optical recording medium of the third embodiment. Fig. 10 is a cross-sectional structural view of the optical recording medium of the fourth embodiment. Fig. 11A-C is a view for explaining the principle of recording and reproducing of the optical recording medium of the fourth embodiment. Fig. 12 is a cross-sectional structural view showing an optical recording medium according to a fifth embodiment. Figs. 13A-C are views for explaining the principle of recording and reproducing of the optical recording medium of the fifth embodiment. Fig. I4 is a cross-sectional structural view of an optical recording medium according to a sixth embodiment. Fig. 15 is a view for explaining the principle of recording and reproducing of the optical recording medium of the sixth embodiment. Fig. 16 is a view for explaining an optical recording medium as a modification. Fig. 17 is a diagram for explaining a capacity recording mode. Fig. 18 is a diagram for explaining crosstalk in the depth direction. [Description of main components] 10 Recording device 11 Laser for recording 12 Collimating lens 13 Half mirror 14 Laser for reproduction 15 Collimating lens 16 Polarizing beam splitter 17 Fixed lens 18 Movable lens 19 Lens drive unit 161999.doc Mirror 1 /4 wavelength plate dichroic prism objective lens 2 axis actuator condensing lens reproducing light receiving unit servo laser collimating lens polarizing beam splitter 1⁄4 wavelength plate servo light receiving unit light emitting driving unit recording processing unit light emitting driving unit Servo and reproduction light matrix circuit reproduction processing unit servo, reproduction light servo circuit servo light matrix circuit servo light servo circuit controller optical recording medium optical recording medium optical recording medium-52-201243841 60 65 OP sw Optical recording medium light Recording media optical pickup switch 16l999.doc

Claims (1)

201243841 VII. Patent application scope: 1. A recording device for concentrating laser light in the vicinity of the interface of an optical recording medium having a structure in which a plurality of first layer and second layer are formed, and at the above interface In the vicinity thereof, a recording mark is formed which does not form a void mark and is accompanied by a change in the refractive index and/or a change in the shape of the interface. 2. The recording apparatus of claim 1 wherein the refractive index of the first layer and the second layer are different. 3. The recording device of claim 2, wherein the second layer is configured to expand in a vicinity of a concentration point of the laser light; and the Young's coefficient of the second layer is set to be lower than the first layer; The interface forms a recording mark that does not form a recording mark of the empty mark, and is a shape change of the interface caused by the aspect of the second layer side protrusion. 4. The recording device of claim 3, wherein the second layer is formed by a modulation corresponding to the power of the laser light to generate the expansion and the refractive index; and in the vicinity of the interface, formation is not formed. The recording mark of the empty mark is a recording mark which is changed in accordance with the modulation of the refractive index and the shape change of the interface caused by the protrusion on the second layer side. 5. The recording device of claim 2, wherein the second layer is configured to generate a modulation of the refractive index in the vicinity of a concentration point of the laser light, and the Young's coefficient of the second layer is set to be higher than the first The layer height is high; and the label of the above-mentioned interface is formed, and the recording mark which is not caused by the modulation of the refractive index is formed, which is not recorded by the above-mentioned empty package mark 16l999.doc 201243841. 6. The recording device according to claim 2, wherein the first layer and the second layer are configured to generate a refractive index change in the vicinity of the condensed light of the laser light; and adjacent to the interface A portion of the first layer and the second layer is formed so as not to form a recording mark of the empty mark, and the recording mark is accompanied by the modulation of the refractive index. 7. The recording apparatus of claim 6, wherein the Young's coefficient of the second layer is set lower than the first layer; and in the vicinity of the interface, a recording mark that does not form the empty packet mark is formed and is accompanied The shape of the interface due to the convexity of the second layer side is changed, and the recording mark is accompanied by the modulation portion of the refractive index across the first layer and the second layer. 8. The recording apparatus of claim 6, wherein the second layer is configured to generate the refractive index modulation in a state in which a lower temperature is generated before deformation of an interface corresponding to thermal expansion of the laser light irradiation; or the above The laminated structure of the first layer and the second layer is formed in a state of being pressed from the vertical direction; and the portion adjacent to the interface and spanning the second layer and the second layer is formed so as not to form the above-mentioned interface. The recording mark of the empty package mark and the recording mark caused by the modulation of the above refractive index. 9. The apparatus of claim 2, wherein the second layer is formed by a method corresponding to the irradiation of the laser light and corresponding to heating in the vicinity of the light spot; 161999.doc 201243841 The Young's modulus is set to be higher than the first layer; and the laminated structure of the first layer and the second layer is formed in a state of being pressurized from the up-and-down direction; the formation of the above-mentioned interface does not form the above-mentioned empty package mark. The mark is recorded, and is a recording mark which changes the shape of the interface caused by the aspect of the first layer side protrusion. Ίο. 11. 12. 13. 14. 15. The recording apparatus of claim 1, wherein the modulation of the refractive index is imparted by the formation of loose. The recording apparatus of claim 1, wherein the modulation of the refractive index is imparted by coloring. The recording device of claim 2, further comprising: a focus servo control unit that performs focus servo control on the laser light based on a result of detecting reflected light from the interface. A recording method for concentrating laser light in the vicinity of the interface of an optical recording medium having a structure in which an interface between a plurality of first layers and a second layer is formed, and forming an empty package in the vicinity of the interface A recording mark that is marked and accompanied by a change in the refractive index and/or a change in the shape of the above interface. a light-recorded medium having a structure in which a plurality of interfaces of the first layer and the second layer are formed; and in the vicinity of the interface, formation of a void mark is not formed and the refractive index is modulated and/or A record mark of the shape change of the interface. The optical recording medium of claim 14 wherein the interval between the interfaces is 5 μηι or more. 161999.doc