KR20030069544A - High density optical disk driver, optical recorder thereof - Google Patents

Abstract

The present invention provides a high density optical disc including a recording layer formed for recording / reproducing data and a substrate layer formed to have a predetermined thickness for protecting the recording layer above the recording layer. Sensing means for sensing a high density optical disc to include a recognition layer so as to be distinguishable, a recognition layer formed on the substrate layer of the optical disc, and data according to the detection signal only when the sensing means detects the recognition layer of the high density optical disc. Light irradiated from the light emitting unit when the optical disc is inserted by the high density optical disc optical recording and reproducing apparatus, characterized by including a servo controller having a function of controlling a focus search operation of the optical pickup unit for recording / reproducing. And CD / DVD and high density optical discs depending on whether Size can be determined, and the normal CD / DVD surface can be prevented from colliding with the objective lens of the optical pickup unit, and the disc identification operation can be performed to perform appropriate recording / playback operation according to the high density DVD or general DVD or CD. To help.

Description

High density optical disc and optical recording and reproducing apparatus {HIGH DENSITY OPTICAL DISK DRIVER, OPTICAL RECORDER THEREOF}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording / playback apparatus having a high density disk and a high density disk recognition device. In particular, a general CD / former having different heights of recording layers for recording / reproducing data in a high density DVD optical recording / reproducing device, which is a high density disk, is provided. A high density optical disc and an optical recording / reproducing apparatus thereof for discriminating a DVD and preventing the objective lens of the optical pickup unit from being damaged due to contact with the surface of the disc during a focus search operation.

In general, optical discs, which are optical recording media, are commercially available compact discs (hereinafter referred to as CDs), followed by digital versatile discs (DVDs) with improved recording capacity, and high density digital. High Density Digital Versatile Discs (hereinafter referred to as' high density DVD's) have been developed and marketed, and these optical discs are becoming denser, such as narrowing the Pit Pattern size and Track Pitch. .

In response to the high-density optical disk, the optical pickup must form a smaller optical spot, and the size of the optical spot is larger than the diffraction limit value which is proportional to λ / NA depending on the wavelength λ of the light source and the numerical aperture NA of the objective lens. Cannot be made small.

Accordingly, in order to shorten the oscillation wavelength λ generated from the light source, the reproducing apparatus of the optical recording medium employs a short wavelength light source such as a blue laser and attempts to realize a smaller light spot by increasing the NA of the objective lens. Doing.

As shown in FIGS. 1 to 3, the optical disk as the optical recording medium is classified into a CD 110, a DVD 120, and a high-density DVD 130, which is a high-density optical disk.

As shown in FIG. 1, the CD 110 has a disk thickness of 1.2 mm, a disk diameter of 120 mm, a central table 111 having a diameter of 15 mm, and a ten table provided in the CD optical recording / reproducing apparatus; It is manufactured to have a clamping area 112 having a diameter of 44 mm for being clamped by a clamper.

In addition, the recording layer 114 recorded in the Pit pattern of the CD 110 is connected to an object lens 115 of the optical pickup unit included in the CD optical recording / reproducing apparatus. In the opposite direction, the optical pickup for the CD has a value of NA = 0.45 with a relatively small numerical aperture NA.

As shown in FIG. 2, the DVD 120 has a central hole 121 and a clamping region 122 formed on a disc having the same size as the CD 110, and the fit pattern () is formed on the DVD 120. The data recording layer 124 recorded in the Pit Pattern is formed at a position spaced about 0.6 mm in a direction opposite to the objective lens 125 of the optical pickup unit included in the DVD optical recording / reproducing apparatus. NA with a relatively large numerical aperture (NA) of the objective lens 125 for focusing the laser using a red semiconductor laser (wavelengths of 635 mm to 650 mm) having a shorter wavelength than an infrared semiconductor laser for wavelengths (about 780 mm wavelength). The recording capacity is increased by about 6 to 8 times the size of the CD 110 so as to have a value of = 0.6.

As shown in FIG. 3, the high density DVD 130 has a disc thickness of 1.2 mm, a disc diameter of 120 mm, a central hole 131 having a diameter of 15 mm, and a clamping region 132 having a diameter of 44 mm. The data recording layer 134, which is manufactured in the same structure as the 110 and the DVD 120, and is recorded in the Pit pattern of the high density DVD 130, is an optical pickup included in the high density DVD optical recording / reproducing apparatus. It is formed at a position spaced about 0.1 mm in the direction opposite to the negative objective lens (135).

In addition, the numerical aperture NA of the objective lens 135 of the optical pickup unit of the high-density DVD optical recording / reproducing apparatus has a relatively large value of NA = 0.85, and reproduces or records pit-shaped data recorded at high density. For recording, a shorter wavelength laser beam is used than the CD and DVD.

Therefore, while the optical pickup unit objective lens 135 of the optical recording and reproducing apparatus is brought closer to the recording layer 134 of the high density DVD 130, the short wavelength laser beam is emitted and the objective lens 135 By increasing the numerical aperture (NA) of the laser beam, it is possible to form a laser beam of a larger amount of light into a small light spot in a pit shape recorded with high density, and also to make the light transmitting layer through which the laser beam of short wavelength is transmitted at the shortest axial distance. It is possible to shorten, it is possible to minimize the change in the properties of the laser beam and the occurrence of aberration.

On the other hand, as shown in Figure 4, when the high-density DVD 130 is mounted on the ten table 140 provided in the high-density DVD optical recording and reproducing apparatus, the servo operation, for example, the spindle motor 139 and The objective lens 135 of the optical pickup unit 136 moves up and down with a predetermined operating distance while being rotated at a high speed by the motor driver 138 and the servo operation by the servo controller 137. After the focusing operation is performed, the reproduction or recording operation of the data recorded at a high density in a pit shape is performed normally.

However, as shown in FIG. 5 and FIG. 6, when the CD 110 to the DVD 120 having the same manufacturing specifications as the high density DVD 130 are incorrectly inserted into the high density DVD optical recording / reproducing apparatus, As described above, the CD 110 and the DVD 120 are rotated at high speed by the servo operation by the spindle motor 139, the motor driver 138, and the servo controller 137. ) And the recording layers 114 and 124 of the DVD 120 are formed by 1.1 mm and 0.6 mm, respectively, as compared to the recording layer of the high density DVD 130 which is normally inserted and seated.

Accordingly, since the normal focusing operation in which the objective lens 135 of the optical pickup unit 136 is moved up and down is not performed, the normal data recording or reproducing operation is not performed, thereby controlling the focusing search operation. In this case, the objective lens 135 of the optical pickup unit 136 is continuously moved vertically to perform the focusing search operation toward the recording layer 134 of the high-density DVD 130 to the maximum movable range, so that the optical pickup unit 136 ), The surface of the objective lens 135 and the CD 110 and the DVD 120 collide with each other, causing the CD 110 and the DVD 120 or the objective lens to be broken or a fatal error in the servo operation. .

According to the present invention devised to solve the above problems, an optical pickup having an identification means for discriminating a CD (CD) and a DVD (DVD) inserted in an optical recording / reproducing apparatus for a high density DVD (HD-DVD) An object of the present invention is to provide a high-density disc and its optical recording / reproducing apparatus for preventing the negative objective lens from being damaged by the focusing operation.

1 is a partial cutaway perspective view of a typical CD (CD),

2 is a partial cutaway perspective view of a typical DVD (DVD),

3 is a partial cutaway perspective view of a typical high-density DVD (HD-DVD),

4 is a schematic diagram showing that a high density DVD (HD-DVD) is normally inserted into a high density optical disc optical recording / reproducing apparatus;

Fig. 5 is a schematic diagram showing that a typical CD is inserted wrongly in a high density optical disc optical recording / reproducing apparatus;

FIG. 6 is a schematic diagram showing that a general DVD (DVD) is incorrectly inserted into a high-density optical disc optical recording / reproducing apparatus; FIG.

7 is a partial cutaway perspective view of a high-density DVD (HD-DVD) of the present invention;

8 is a schematic diagram showing that a high density DVD is normally inserted into the high density optical disc optical recording / reproducing apparatus of the present invention;

9 is a schematic diagram showing a fixed position of the sensing means of the high density optical disc optical recording / reproducing apparatus of the present invention.

* Description of the main parts of the drawings *

30: high density DVD 31: central hole

32: clamping area 33: recording layer

34: substrate layer 35: objective lens

36: optical pickup unit 37: servo controller

38: motor driver 39: spindle motor

41: light emitting portion 42: light receiving portion

In order to achieve the above object, the present invention is to have a protective layer formed on the bottom, a recording layer formed for recording / reproducing data above the protective layer, and a predetermined thickness for protecting the recording layer above the recording layer. A high density optical disc comprising a formed substrate layer, wherein the substrate layer is achieved by a high density optical disc, characterized in that it comprises a recognition layer so as to be distinguishable from the CD / DVD.

Here, it is preferable that the recognition layer forms the substrate layer so as not to transmit light.

In addition, a focus search operation of a high density optical disc sensing means having a recognition layer formed on the substrate layer and an optical pickup unit for recording / reproducing data according to the detection signal is performed only when the sensing means detects the recognition layer of the high density optical disc. A high density optical disc optical recording and reproducing apparatus, comprising: a servo controller added with a control function.

Here, the sensing means is mounted on one side of the outer peripheral surface of the CD / DVD to the high-density optical disk mounted to the light emitting unit for irradiating light horizontally to the substrate layer, and to detect the light passing through the substrate layer from the light emitting unit It is preferable that the light receiving unit is configured for.

The light emitting unit may be a light emitting diode, and the light receiving unit may be a photo sensor.

Hereinafter, an embodiment of an optical recording and reproducing apparatus having a high density optical disc and a high density optical disc recognizing apparatus of the present invention will be described in detail with reference to the drawings.

5 is a longitudinal cross-sectional view of the high density optical disc of the present invention, wherein the high density DVD 30, which is the high density optical disc, has a disc thickness of 1.2 mm, a disc diameter of 120 mm, and 15 mm, as described above with reference to FIG. It is made of a structure having a central hole 31 having a diameter, a turntable 40 provided in the optical recording and reproducing apparatus, and a clamping area 32 having a diameter of 44 mm that is clamped by the clamper.

The high density DVD 30 is formed of a stacked structure of a lower layer, a protective layer, a dielectric layer, a recording layer, a dielectric layer, a reflective layer, and a substrate layer. However, the present invention is not limited to the stacking structure of the optical disc, and thus, the recording layer 34 and the substrate layer 33 protecting the recording layer 34 will be schematically illustrated and described.

Therefore, the data recording layer 34 recorded in the pit pattern is positioned at about 0.1 mm in a direction opposite to the objective lens 35 of the optical pickup section 36 included in the high density DVD optical recording / reproducing apparatus. As described above, the high density DVD 30 inserted into the high density DVD optical recording / reproducing apparatus on the 1.1 mm substrate except for the recording layer 34 can be distinguished from the CD 110 and the DVD 120 which are ordinary optical disks. The recognition layer is formed so as to.

The recognition layer is formed opaque by adding an opaque pigment to the transparent material forming the substrate layer 33 of the high-density DVD 30, the CD 110 / DVD 120 and the high-density optical discs according to the transmission of light The division of the DVD (30).

In addition, the recognition layer is preferably formed to opaque the entire substrate or to have a predetermined width along the circumferential surface so as not to transmit light.

In the high density DVD optical recording / reproducing apparatus of the present invention, as shown in Figs. 8 and 9, when normally inserted and seated on the ten table 40 provided therein, the servo operation, for example, the spindle motor 39 ), The motor driver 38, and the objective lens 35 of the optical pickup unit 36 have a predetermined operating distance in the state of being rotated at high speed by the servo operation by the servo controller 37. And reproducing or recording the data recorded at a high density in the pit shape after being focused by the focusing operation moved to.

In addition, during the optical pickup unit 36 of the high density DVD optical recording / reproducing apparatus, the optical lens 35 has a recording layer 34 formed by 1.1 mm and 0.6 mm farther than the high density DVD 30, respectively. It is provided with a high-density DVD (30) detection means for preventing the damage to the surface of the CD 110 / DVD (120) to be broken.

The sensing means horizontally radiates light onto the substrate layer of the CD 110 / DVD 120, which is a general optical disk, which is inserted and seated on a turntable provided in the high density DVD optical recording / reproducing apparatus, and the high density optical disk 30, which is a high density optical disk. The servo unit is configured so that the optical pickup unit 36 controls the Fourth Search operation by detecting the light emitting unit 41 closely assembled to the circumferential surface and the light emitted from the light emitting unit 41 and passing through the substrate layer to pass therethrough. The light receiver 42 is configured to recognize whether the controller 37 detects light.

The light emitting unit may be a light emitting diode, and the light receiving unit may be a photo sensor.

Therefore, when light is emitted from the light emitting unit 41 so as to assemble closer to the peripheral surface of one side of the CD 110 / DVD 120 to the high density DVD 30 so that light passes horizontally to the recording side, the high density optical disk is the high density. In the case of the DVD 30, light is not sensed by the light receiving unit 42 disposed in the same plane near the other peripheral surface, whereas in the case of the CD 110 or the DVD 120 which is a general optical disk, the transparent substrate layer 113 ( Light passes from the side of the disk through the 123 to allow the light to be detected by the light receiving portion 42, and the light receiving portion makes the servo controller 37 recognize whether the light is detected so that the optical pickup portion of the high density DVD optical recording / reproducing apparatus ( The objective lens 35 of 36 does not perform the focusing search operation to prevent breakage.

As described above, according to the present invention, by determining the type of the optical disc when the optical disc is inserted and determining the driving environment accordingly, it is possible to prevent the collision between the disc and the optical pickup and to perform the proper recording / reproducing operation of the optical recording / reproducing apparatus according to the disc type. Has the effect of being able to perform.

Claims (6)

A high density optical disc comprising: a recording layer formed for recording / reproducing data formed in a bottom portion; and a substrate layer formed to have a predetermined thickness for protecting the recording layer above the recording layer. And the substrate layer comprises a recognition layer so as to be distinguishable from the CD / DVD. The high density optical disc of claim 1, wherein the recognition layer forms the substrate layer so as not to transmit light. High-density optical disk sensing means having a recognition layer formed on the substrate layer, and the focus search operation of the optical pickup unit for recording / reproducing data according to the detection signal only proceeds when the sensing means detects the recognition layer of the high density optical disk. A high-density optical disc optical recording and reproducing apparatus, comprising: a servo controller having a function added thereto. According to claim 3, wherein the sensing means is mounted on one side of the outer peripheral surface of the CD / DVD to the high-density optical disk mounted and a light emitting portion for irradiating light to the substrate layer horizontally, and the light emitting portion is passed through the substrate layer A high density optical disc optical recording and reproducing apparatus, characterized by comprising a light receiving unit for detecting light. 5. The high density optical disc optical recording and reproducing apparatus according to claim 4, wherein the light emitting portion is a light emitting diode. 5. The high density optical disc optical recording and reproducing apparatus according to claim 4, wherein the light receiving unit is a light sensing sensor.