JP2003077177A - Data recording medium, data recording medium recording apparatus and recording method, and data recording medium reproducing apparatus and reproduction method - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To enable a recordable record carrier to be joined to a read-only record carrier, without being restricted by the properties of an optical disc.
Provide applications to users in various forms. SOLUTION: A read-only first record carrier 2 having optical transparency, and a record-type second record carrier 3 provided with a recording layer capable of recording data by irradiating a light beam.
And the second record carrier 3 is bonded to the surface of the first record carrier opposite to the surface on which the two light beams are incident.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data recording medium in which, for example, a sheet-shaped recordable record carrier or a read-only record carrier is joined to a read-only record carrier or a record-type record carrier. The present invention relates to a data recording apparatus and method for recording data, and a data reproducing apparatus and method for reproducing data recorded on this recording medium.

[0002]

2. Description of the Related Art Optical disks used as data recording media include read-only optical disks and recording optical disks. A read-only optical disc is made by sequentially laminating a reflective film and a protective film on one surface side of a light-transmissive disc substrate on which a repeating pattern of pits and lands is formed. Data can be read by irradiating a light beam. A recording-type optical disc has a recording layer of organic dye, phase change material, etc., a reflective layer, and a protective layer, which are sequentially stacked on one surface of a light-transmissive disc substrate on which a repeating pattern of lands and grooves is formed. Thus, the data recording / reproducing apparatus can irradiate a light beam from the disk substrate side to record / reproduce data.

[0003]

By the way, an optical disc in which a recordable area is provided in a part of a read-only type optical disk or a read-only area is provided in a part of a recordable optical disk is being studied. In these optical discs, the area is divided and one of the areas is allocated to a recordable area or a reproduction-only area. Such an optical disc is not restricted by the properties of the read-only type optical disc or the recording type optical disc, and can provide the application to the user in various forms.

However, these optical discs are different from existing optical discs in the physical format, for example, so that it is necessary to use a dedicated device for the data recording device and the data reproducing device, and lacks versatility.

An object of the present invention is to provide a data recording medium provided with a read-only recording section which is easily compatible with existing data recording media and a recordable recording section.

Another object of the present invention is to provide a recording-type or reproduction-only sub-recording medium which can be bonded to a reproduction-only type or recording-type main recording medium serving as a substrate.

Further, an object of the present invention is to provide a data recording apparatus and method capable of recording data on the above recording medium and reproduction of the data recorded on such recording medium. A data reproducing apparatus and method are provided.

[0008]

A data recording medium according to the present invention has a light transmitting property in order to solve the above-mentioned problems.
A read-only first record carrier having a recording layer in which data is recorded in advance by repeating pits and lands, and a recordable second record carrier provided with a recording layer capable of recording data by irradiation of a light beam. Record carrier. Then, the second record carrier is bonded to the surface of the first record carrier opposite to the surface on which the light beam is incident.

In order to solve the above-mentioned problems, the data recording medium according to the present invention is of a recording type having a light transmitting property and provided with a recording layer capable of recording data by irradiation of a light beam. It has a first record carrier and a read-only second record carrier having a recording layer in which data is previously recorded by repeating pits and lands. Then, the second record carrier is bonded to the surface of the first record carrier opposite to the surface on which the light beam is incident.

Further, in order to solve the above-mentioned problems, the sub-recording medium according to the present invention is light-transmissive and has a recording layer in which data is recorded in advance by repeating pits and lands. In a sub-recording medium that is joined to a recording medium to form a multi-layered data recording medium, the sub-recording medium has a sheet-shaped substrate, and the substrate is formed with a recording layer capable of recording data, One surface side is a bonding surface to the main recording medium.

Furthermore, in order to solve the above-mentioned problems, the sub-recording medium according to the present invention is a recording type having a light-transmitting property and provided with a recording layer capable of recording data by irradiation of a light beam. In the sub-recording medium that is joined to the main recording medium of the above to form a multi-layered data recording medium, the sub-recording medium has a sheet-like base, and the base has pre-recorded data by repeating pits and lands. A recording layer is formed, and one surface side is a bonding surface to the main record carrier.

Furthermore, in order to solve the above-mentioned problems, the data recording apparatus according to the present invention is a recording type record carrier provided with a recording layer capable of recording data, and data is recorded by repeating pits and lands. In a data recording device for recording data on a data recording medium in which a read-only type record carrier having a prerecorded recording layer is laminated, the data recording device and each recording layer of the mounted data recording medium The optical pickup includes an optical pickup that emits a light beam and detects a light beam reflected from the recording layer, and a recording layer detection unit that detects the recording layer of the data recording medium based on a detection output obtained from the optical pickup. Then, the optical pickup records data indicating the number of recording layers detected by the recording layer detection unit on the recording layer of the recordable record carrier.

Furthermore, in order to solve the above-mentioned problems, the data recording method according to the present invention is a recording type record carrier provided with a recording layer capable of recording data, and data is recorded by repeating pits and lands. Irradiating each recording layer of the data recording medium on which a read-only record carrier having a recording layer recorded in advance is laminated with a light beam, and detecting the light beam reflected from each recording layer of the data recording medium, The number of recording layers stacked on the recording medium is detected based on the detection output, and then data indicating the detected number of recording layers is recorded on the recording layer of the recordable record carrier.

Furthermore, in order to solve the above-mentioned problems, the data recording apparatus according to the present invention records data by repeating recording pits and lands with a recording type record carrier provided with a recording layer capable of recording data. In a data recording device for recording data on a data recording medium in which a read-only type record carrier having a prerecorded recording layer is laminated, the data recording device is provided for each recording layer of the mounted data recording medium. An optical pickup for irradiating a light beam on the recording layer and detecting the light beam reflected from the recording layer; and a recording layer detection unit for detecting the recording layer of the recordable record carrier based on the detection output obtained from the optical pickup. . Then, the optical pickup records the data on the recording layer of the recordable record carrier detected by the recording layer detector.

Furthermore, in order to solve the above-mentioned problems, the data recording method according to the present invention is a recording type record carrier provided with a recording layer capable of recording data, and data is recorded by repeating pits and lands. A read-only record carrier having a prerecorded recording layer is irradiated with a light beam on each recording layer of a data recording medium, and a recordable record carrier of the record carrier is obtained based on a detection output obtained from a photodetector. The recording layer is detected and then the data is recorded on the recording layer of the detected record-type record carrier.

Furthermore, in order to solve the above-mentioned problems, the data reproducing apparatus according to the present invention can record data by repeating recording pits and lands with a recording type record carrier provided with a recording layer capable of recording data. In a data reproducing apparatus for reproducing data recorded on a data recording medium in which a read-only type record carrier having a prerecorded recording layer is laminated, the data reproducing apparatus records each data of the mounted data recording medium. An optical pickup that irradiates a layer with a light beam and detects the light beam reflected from the recording layer, and a light beam reflected from the recording layer of the data recording medium are detected, and data is recorded based on the detection output. And a recording layer detection unit that detects a recording layer that is present. Then, the optical pickup reads the recording layer in which the data detected by the recording layer detection unit is recorded.

Furthermore, in order to solve the above-mentioned problems, the data reproducing method according to the present invention is a recording type record carrier provided with a recording layer capable of recording data, and data is reproduced by repeating pits and lands. A light beam is irradiated to each recording layer of a data recording medium on which a read-only type record carrier having a prerecorded recording layer is laminated, and a light beam reflected from the recording layer of the data recording medium is detected, Detects the recording layer on which data is recorded based on the detection output,
Next, the recording layer on which the detected data is recorded is read out.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION An optical disc to which the present invention is applied, a data recording device and method for recording data on the optical disc, and a data reproducing device and method for reproducing data recorded on the optical disc will be described below with reference to the drawings. Will be described with reference to.

First, an optical disc to which the present invention is applied will be described with reference to FIGS. In this optical disc 1, a recordable second record carrier 3 capable of recording an information signal is bonded to a read-only first record carrier 2 having an information signal recorded on one surface side. It is a thing.

The first record carrier 2 has a rigid disc substrate 2a made of synthetic resin such as polycarbonate resin having a light transmitting property, glass or the like. This disk substrate 2a
A pit pattern 2b, which is a minute concavo-convex pattern, is formed on one surface in correspondence with content data such as audio data, movie data, and game software. The recorded data may be encrypted by a predetermined method. This pit pattern 2b
When the disc substrate 2a is formed of a synthetic resin and the disc substrate 2a is injection molded,
It is formed by transferring the uneven pattern of the stamper simultaneously with the molding of a. When the disk substrate 2a is made of glass, 2P (Photo Polymerization)
Formed using the method. In the 2P method, the uneven pattern of the stamper is transferred by curing a photocurable resin such as an ultraviolet curable resin between the glass substrate and the stamper,
The pit pattern 2b is formed. The disc substrate 2 of the optical disc 1 to which the present invention is applied is formed by injection-molding a polycarbonate resin. As described above, a plurality of pits having a plurality of pits for information signals are formed on one side of the disc substrate 2a. It is recorded by a pit pattern 2b which constitutes recording tracks arranged concentrically.
That is, the disc substrate 2a is formed in the same manner as a generally used disc substrate of a compact disc having a diameter of 12 cm.

Pit pattern 2 of this disk substrate 2a
A first reflection film 2c is formed on one surface where b is formed so as to cover the pit pattern 2b. This first
The reflective film 2c is formed as a semi-transmissive film that transmits a certain amount of the light beam emitted from the disc substrate 2a side and reflects the certain amount of the light beam. In this case, the first reflective film 2c is made of Si.
It is formed of a silicon-based film such as ₃ N ₄ or SiO ₂ . These films are formed on the disk substrate 2a by a vacuum evaporation method or a sputtering method.

On the first reflective film 2c, a protective film 2d formed of a light-transmitting ultraviolet curable resin or the like is formed so as to be laminated on the first reflective film 2c. The protective film 2d functions as a protective film that prevents the first reflective film 2c and the like from being contaminated when the first record carrier 2 itself is handled by the user, and the first record carrier 2 is provided with a second film. A part of an intermediate film that separates the recording layer made of the reflective film of the second record carrier 3 and the recording layer made of the first reflective film of the first record carrier 2 when the record carrier 3 of FIG. Function as. The protective film 2d is made of a UV-curable resin having a light-transmitting property by a spin coating method.
It is formed by applying it on the reflective film 2c and irradiating it with ultraviolet rays to solidify it.

The first record carrier 2 configured as described above
Is sold as a package medium in which content data is recorded, for example, at a record store.

Further, the second record carrier 3 has a flexible sheet body 3a having the same size as the first record carrier 2. Although not shown, a groove pattern provided with a groove serving as a guide for recording data is formed on one surface of the sheet 3a. This groove pattern is used as a guide for applying tracking servo and the like, and is wobbled in accordance with address information at the time of recording.

A second reflective film 3b is formed on the surface of the sheet body 3a on which the groove pattern is formed. The second reflective film 3b is a metal capable of ensuring a high reflectance such as aluminum (Al), gold (Au), and silver (Ag) for reflecting the light beam transmitted through the first record carrier 2 to the optical pickup. And the like. Then, a signal recording film 3c on which an information signal is recorded by irradiating a light beam is provided on the second reflecting film 3b. The signal recording film 3c is formed of an organic dye material when it is a write-once type in which data can be written only once, and is formed of a phase change material in a rewritable type in which data can be rewritten. Further, an adhesive layer 3d for bonding to the protective film 2d of the first record carrier 2 is formed on the signal recording film 3c. The adhesive layer 3d is formed of a light transmissive adhesive so that the light beam is incident on the second reflective film 3b.

The second record carrier 3 having such a structure
Are sold separately from the first record carrier 2, for example, as those that add value to the first record carrier 2. Then, the second record carrier 3 is attached to the first record carrier 2 by the user. At this time, the second record carrier 3
Since it has flexibility, it can be easily attached to the first record carrier 2 having rigidity.

Here, the optical disc 1 in which the second record carrier 3 is attached to the first record carrier 2 is formed to have an overall thickness of about 1.2 mm, which is the same as a compact disc or a digital versatile disc. . Therefore, the optical disc 1 can be reproduced by a recording and / or reproducing device such as a compact disc or a digital versatile disc.

Here, the first reflective film 2c of the first record carrier 2 is formed so as to have a higher reflectance than the second reflective film 3b of the second record carrier 3. For example, the first reflection film 2c of the first record carrier 2 has a light beam reflectance of about 60%, and the second reflection film 3b has a light beam reflectance of about 10%. . Further, the first reflection film 2c may be formed so as to have a lower reflectance than the second reflection film 3b. For example, the reflective film 2c of the first record carrier 2
Has a reflectance of the light beam of, for example, about 20%, and the second reflection film 3b has a reflectance of the light beam of, for example, about 50%. That is, the difference in reflectance between the first reflective film 2c and the second reflective film 3b can be appropriately changed depending on the material and thickness of the reflective film. As described above, the optical disc 1 has different reflectances of the reflection films 2c and 2b of the respective record carriers 2 and 3, so that the output levels of the photodetectors of the optical pickups are different on the data recording and / or reproducing device side. As a result, it is possible to specify the number of recording layers of the optical disc 1 and the type of recording layer of the read-only type or the recording type in the data recording and / or reproducing apparatus. it can.

When such an optical disc 1 is loaded in a recording and / or reproducing apparatus, a light beam is emitted from the side of the disc substrate 2a of the first record carrier 2 so that the first reflection film 2 is formed.
The content data recorded on the first record carrier 2 can be read out by detecting the light beam reflected by either c or the second reflection film 3b by the optical pickup, and the second data can be read. It is possible to record data on the second record carrier 3 and read the data recorded on the second record carrier 3. At this time, the first reflective film 2c and the second reflective film 2c
The protective film 2d and the adhesive layer 3d between the reflective film 3b and the reflective film 3b function as an intermediate film that optically separates the first reflective film 2c and the second reflective film 3b, so that the light beam is directed to the first reflective film 2c. , The second reflective film 3b can be reliably focused.

In the above example, the second record carrier 3 has flexibility, but the second record carrier 3 has rigidity like the first record carrier 2. It may be. Further, the groove pattern provided on the sheet body 3a may be formed on the sheet body 3a by an uneven pattern, or the groove pattern may be printed on the sheet body 3a. In this case, the sheet body 3a may be formed of a light-transmissive material, a groove pattern may be printed on one surface side, and a reflective film may be formed on the other surface side. It may be formed so as to function as a film. Further, between the signal recording film 3c and the adhesive layer 3d, the signal recording film 3c is protected and the first reflection film 2 is formed.
The protective film that functions as a part of the intermediate film that optically separates c from the second reflective film 3b is formed by applying a light-transmitting ultraviolet-curing resin or the like by a spin coating method and solidifying it. You may

By the way, the optical disc 1 as described above,
It can be used as follows. For example, the read-only first record carrier 2 may include audio data, movie data,
Content data such as game software, moving image data, and still image data is recorded and distributed as package media. Then, the second record carrier 3 distributed separately from the first record carrier 2 is attached to the first record carrier 2 and loaded into the recording and / or reproducing apparatus. Then, the related data related to the content data is recorded on the second record carrier 3 attached to the first record carrier 2. For example, when audio data is recorded on the first record carrier 2, voice data sung by the user can be recorded on the second record carrier 3. Also, when movie data is recorded on the first record carrier 2, additional data or the like that allows the user to get into the story of the movie can be recorded on the second record carrier 3.
Further, when game software is recorded on the first record carrier 2, data being reproduced such as save data such as an address at the end of reproduction is recorded on the second record carrier 3 or an original created by the user himself / herself. Data can be recorded for the character to participate in the game story. Further, content data may be recorded on the first record carrier 2, and key data such as a serial number for starting reproduction of the content data may be recorded on the second record carrier 3. Furthermore, the content data is recorded by being encrypted on the first record carrier 2, and the decryption key for the content distribution company such as a record company to decrypt the encryption of the content data is recorded on the second record carrier 3. The second record carrier 3 may be distributed to users.

In the above example, the user is the first record carrier 2
Although the example in which the second record carrier 3 is pasted has been described above, this pasting work is performed by the content distribution company side such as a record company that distributes the content data.
The optical disc 1 in which the recording medium 3 of 1 is attached to the first record carrier 2 may be distributed to users as a package medium.

Further, the optical disc to which the present invention is applied,
It can also be configured as shown in FIGS. In this optical disc 6, a read-only second record carrier 8 on which an information signal is recorded is joined to a recordable first record carrier 7 capable of recording an information signal on one surface side. It is a thing.

The first record carrier 7 has a rigid disk substrate 7a made of a synthetic resin such as a polycarbonate resin having a light transmitting property and glass. This disk substrate 7a
A groove pattern 7b is formed on one surface of the first surface. The groove pattern 7b is used as a guide for applying tracking servo and the like, and is wobbled according to address information at the time of recording. The groove pattern 7b is formed by transferring the concave-convex pattern of the stamper simultaneously with the molding of the disk substrate 7a when the disk substrate 7a is injection-molded when the disk substrate 7a is formed of synthetic resin.
When the disk substrate 7a is made of glass,
It is formed using the 2P (Photo Polymerization) method.
In the 2P method, a concave / convex pattern of the stamper is transferred by curing a photocurable resin such as an ultraviolet curable resin between the glass substrate and the stamper, and the groove pattern 7b is formed. The disc substrate 7a of the optical disc 6 to which the present invention is applied is formed by injection-molding a polycarbonate resin.
A groove pattern 7b forming recording tracks arranged in a spiral shape or a concentric shape is provided on one surface side of a. That is, the disk substrate 7a is formed in the same manner as a commonly used compact disk substrate having a diameter of 12 cm.

On one surface of the disk substrate 7a on which the groove pattern 7b is formed, the groove pattern 7b is formed.
A signal recording film 7c is provided so as to cover the. The signal recording film 7c is made of an organic dye material when it is a write-once type in which data can be written only once, and is made of a phase change material when it is a rewritable type in which data can be rewritten. On the signal recording film 7c, data desired by the user, for example, content data such as audio data and movie data, as well as data such as still image data, moving image data, and computer processed data are recorded.

A first reflection film 7d is formed on one surface of the disk substrate 7a on which the signal recording film 7c is formed so as to cover the signal recording film 7c. The first reflective film 7d is formed as a semi-transmissive film that transmits a certain amount of the light beam emitted from the disk substrate 7a side and reflects the certain amount of the light beam. In this case, the first reflective film 7d is made of Si ₃ N ₄ ,
It is formed of a silicon-based film such as SiO ₂ . These films are formed on the signal recording film 7c by a vacuum evaporation method or a sputtering method.

On the first reflective film 7d, a protective film 7e formed of a light-transmitting ultraviolet curable resin or the like is formed so as to be laminated on the first reflective film 7d. The protective film 7e functions as a protective film that prevents the first reflective film 7d and the like from being contaminated when the first record carrier 7 itself is handled by a user and the like, and
When the second record carrier 8 is joined to the record carrier 7 of
It functions as a part of an intermediate film that separates the recording layer formed of the reflective film of the second record carrier 8 and the recording layer formed of the first reflective film 7d of the first record carrier 7. The protective film 7e is formed by applying a light-transmitting ultraviolet curable resin or the like on the first reflective film 7d by a spin coating method and irradiating it with ultraviolet rays to solidify it.

The first record carrier 7 configured as described above
Is sold as a package medium in which content data is recorded, for example, at a record store.

Further, the second record carrier 8 has a flexible sheet body 8a having the same size as the first record carrier 7. Although not shown, a pit pattern, which is a minute concavo-convex pattern, is formed on one surface of the sheet body 8a in correspondence with content data such as audio data, movie data, and game software. The recorded data may be encrypted by a predetermined method. On the sheet body 8a, an information signal is recorded on one surface side by a pit pattern forming a recording track in which a plurality of pits are arranged spirally or concentrically.

A second reflection film 8b is formed on the surface of the sheet 3a on which the pit pattern is formed.
The second reflection film 8b is a metal capable of ensuring a high reflectance such as aluminum (Al), gold (Au), and silver (Ag) for reflecting the light beam transmitted through the first record carrier 7 to the optical pickup. And the like. The protective film 7e of the first record carrier 7 is formed on the second reflective film 8b.
An adhesive layer 8c for joining to is formed. Adhesive layer 8c
Is formed of a light-transmissive adhesive so that the light beam is incident on the second reflection film 8b.

The second record carrier 8 having such a structure
Are sold separately from the first record carrier 7, for example, as those that add value to the first record carrier 7. Then, the second record carrier 8 is attached to the first record carrier 7 by the user. At this time, the second record carrier 8
Since it has flexibility, it can be easily attached to the first record carrier 7 having rigidity.

Here, the optical disc 6 in which the second record carrier 8 is attached to the first record carrier 7 is formed to have a total thickness of 1.2 mm, which is the same as a compact disc or a digital versatile disc. Therefore, the optical disc 6 can be reproduced by a recording and / or reproducing device such as a compact disc or a digital versatile disc.

Here, the first reflective film 7d of the first record carrier 7 is formed so as to have a higher reflectance than the second reflective film 8b of the second record carrier 8. For example, the first reflection film 7d of the first record carrier 7 has a light beam reflectance of, for example, about 60%, and the second reflection film 8b has a light beam reflectance of, for example, about 10%. . Further, the first reflective film 7d may be formed to have a lower reflectance than the second reflective film 8b. For example, the first reflection film 7d of the first record carrier 7 has a reflectance of the light beam of about 20%,
The second reflection film 8b has a reflectance of the light beam of, for example, 50%.
It is about a degree. That is, the difference in reflectance between the first reflective film 7b and the second reflective film 8b can be appropriately changed depending on the material and thickness of the reflective film. Thus, the optical disc 6
Can make the output levels of the photodetectors of the optical pickup different on the data recording and / or reproducing device side by making the reflectances of the reflecting films 7d, 8b of the respective record carriers 7, 8 different. The data recording and / or reproducing apparatus can specify the number of recording layers of the optical disc 6 and the type of the recording layer of the read-only type or the recording type.

When such an optical disk 6 is loaded in a recording and / or reproducing apparatus, it is irradiated with a light beam from the disk substrate 7a side of the first record carrier 7, and the first reflective film 7d, Data is recorded on the first record carrier 7 and also recorded on the first and second record carriers 7 and 8 by detecting the light beam reflected by any one of the two reflection films 8b with an optical pickup. The read data can be read. At this time, the first reflection film 7d and the second reflection film 8
The protective film 7e and the adhesive layer 8c between the first reflective film 7b and
d and the second reflection film 8b, which functions as an intermediate film that optically separates the second reflection film 8b and the light beam, the first reflection film 7d and the second reflection film 8b.
The focus is on each of them.

In the above example, the second record carrier 8 has the flexibility, but the second record carrier 8 has rigidity like the first record carrier 7. It may be. Further, the pit pattern provided on the sheet body 8a may be formed by printing, instead of being formed by an uneven pattern. In this case, the sheet body 8a may be formed of a light transmissive material, a pit pattern may be printed on one surface side, and a reflective film may be formed on the other surface side.
Further, the sheet body 8a may be formed so as to function as a reflection film. Further, between the second reflective film 8b and the adhesive layer 8c, an intermediate film which protects the second reflective film 8b and optically separates the first reflective film 7d and the second reflective film 8b. The protective film functioning as a part of the above may be formed by applying a light-transmitting ultraviolet curable resin or the like by a spin coating method and solidifying it.

By the way, the optical disc 6 as described above,
It can be used as follows. For example, the record type first
The record carrier 7 is distributed as a blank disc on which no information signal is recorded. And the first record carrier 7
The reproduction-only second record carrier 8 distributed separately from
It is attached to the first record carrier 7 and loaded into a recording and / or reproducing device. Content data such as audio data, movie data, game software, still image data, and moving image data is recorded on the reproduction-only second recording carrier 8 and distributed as a package medium. For example,
When audio data is recorded on the second read-only record carrier 8, the voice data sung by the user can be recorded on the first record carrier 7. When movie data is recorded on the second record carrier 8, additional data or the like that allows the user to enter the story of the movie can be recorded on the recordable first record carrier 7. Furthermore, when game software is recorded on the second record carrier 8, data being reproduced such as saved data such as an address at the time of reproduction is recorded on the first record carrier 3 or an original created by the user himself / herself. Data can be recorded for the character to participate in the game story. Further, content data may be recorded on the second record carrier 8, and key data such as a serial number for starting reproduction of the content data may be recorded on the first record carrier 7. Furthermore, the content data is recorded by being encrypted on the second record carrier 8, and the first record carrier 7 is recorded with a decryption key for the content distribution company such as a record company to decrypt the encryption of the content data. The second record carrier 8 may be distributed to users.

In the above example, the user is the first record carrier 7
The example in which the second record carrier 8 is pasted has been described above, but this pasting work is performed by the content distribution company side such as a record company that distributes the content data.
The optical disc 6 obtained by pasting the recording medium 8 of 1 to the first record carrier 7 may be distributed to users as a package medium.

Next, data for recording data on the recordable record carriers 3, 7 of the optical discs 1, 6 as described above, and reproducing the data recorded on the record carriers 2, 3, 7, 8 The recording / reproducing apparatus 10 will be described with reference to the drawings.

As shown in FIG. 5, the data recording / reproducing apparatus 10 includes an error correction coding unit 11 for adding an error correction code to the data to be recorded, and an error correction coding process for the data. Modulation unit 12 for performing modulation processing
A recording processing unit 13 that performs a recording process for recording data on the optical discs 1 and 6, an optical pickup 14 that emits a light beam to the optical discs 1 and 6 and detects a reflected light beam that is reflected, 1,6 for example CLV
Motor 15 rotating at (constant linear velocity)
An RF amplifier 16 that generates an RF signal or the like from the output from the optical pickup 14, a servo control unit 17 that performs focusing control of the optical pickup 14, tracking control, or rotation control of the motor 56, and a disc based on the RF signal or the like. A recording layer detection unit 18 for detecting the number of recording layers of an optical disk mounted on the rotation drive unit, a switching unit 19 for switching the input of data to be recorded, and a demodulation for demodulating the RF signal output from the RF amplifier 16. It includes a unit 20 and an error correction processing unit 21 that performs error correction processing on the demodulated data.

The error correction coding unit 11 cross-leaves Reed-solomon code (CIR), for example, for digital data.
The sample is encoded by the combination of cross interleaving and fourth-order Reed-Solomon code by using the algorithm of C), and is output to the modulator 12. Modulator 12
Performs modulation processing on the coded output from the error correction coding circuit 23 according to an EFM (Eight to Fourteen Modulation) algorithm, and outputs it to the recording processing unit 13. The recording processing unit 13 performs predetermined recording processing. Output to the optical pickup 14.

The optical pickup 14 is a semiconductor laser that emits a light beam, an objective lens that focuses the light beam emitted from this semiconductor laser, and return light reflected by the reflection films 2c, 3b, 7d and 8b of the optical discs 1 and 6. And a photodetector for detecting the light beam. The light beam emitted from the semiconductor laser is focused by the objective lens and is applied to the reflection films 2c, 3b, 7d and 8b of the optical discs 1 and 6. The returning light beams reflected by the optical discs 1 and 6 are converted into an electric signal by the photodetector, and the photodetector outputs the electric signal to the RF amplifier 16. Also,
The objective lens is held by an objective lens driving mechanism such as a biaxial actuator, and is driven and displaced in a focusing direction parallel to the optical axis of the objective lens and a tracking direction orthogonal to the optical axis of the objective lens. In addition, the motor 15 performs the recording / reproducing operation of the optical discs 1 and 6 when the optical discs 1 and 6 are performed.
Is rotated by, for example, CLV. The motor 15 may rotate the optical discs 1 and 6 at CAV (cnstant angular velocity).

The RF amplifier 16 generates an RF signal, a focusing error signal and a tracking error signal based on the output signal from the photodetector which constitutes the optical pickup 14. For example, the focusing error signal is
The tracking error signal generated by the astigmatism method is generated by the 3-beam method or the push-pull method. Then, the RF amplifier 16 outputs the focusing error signal and the tracking error signal to the servo control unit 17.

Here, as shown in FIG. 6, the photodetector 30 used in the optical pickup 14 has four light receiving portions 31a, 31b, 31c and 31d. The RF amplifier 16 includes an amplifier 32 that adds the outputs of the light receiving units 31a and 31c, an amplifier 33 that adds the outputs of the light receiving units 31b and 31d, and an output of the amplifier 32 and the amplifier 33.
An amplifier 34 for adding the output of the amplifier and a differential amplifier 35 for subtracting the output of the amplifier 32 and the output of the amplifier 33.

The amplifier 32 includes an output of the light receiving portion 31a (hereinafter, an output of the light receiving portion 31a is A) and a light receiving portion 31c.
Output (hereinafter, the output of the light receiving unit 31b is B) is added, and the obtained value (A + C) is output to the amplifier 34 and the differential amplifier 35. The amplifier 33 outputs the output of the light receiving unit 31b (hereinafter, the output of the light receiving unit 31b is B) and the light receiving unit 3.
1d output (hereinafter, the output of the light receiving unit 31d is D)
And are added, and the obtained value (B + D) is output to the amplifier 34 and the differential amplifier 35. The amplifier 34 adds the output (A + C) of the amplifier 32 and the output (B + D) of the amplifier 33, and outputs the obtained value (A + B + C + D), that is, the RF signal to the demodulation unit 20 and the recording layer detection unit 18. Also,
The differential amplifier 35 subtracts the output (B + D) of the amplifier 33 from the output (A + C) of the amplifier 32 to obtain a value {(A
+ C)-(B + D)}, that is, a focusing error signal is output to the servo controller 17 and the recording layer detector 18.

The servo control unit 17, as shown in FIG.
A servo signal for recording / reproducing the optical disks 1 and 6 is generated. Specifically, the servo control unit 17 generates a focusing servo signal based on the focusing error signal, and also generates a tracking servo signal based on the tracking error signal. Then, the servo control unit 5
Reference numeral 8 outputs the focusing servo signal and the tracking servo signal to the drive circuit of the objective lens drive mechanism which constitutes the optical pickup 14. And this drive circuit
The objective lens is driven and displaced in the focusing direction parallel to the optical axis of the objective lens based on the focusing servo signal, and the objective lens is driven and displaced in the tracking direction orthogonal to the optical axis of the objective lens based on the tracking servo signal. . Further, the servo control unit 17 drives and controls the motor 15 based on the reference clock from the crystal oscillator and the clock from the PLL circuit so that the rotation speeds of the optical disks 1 and 6 become constant linear speeds.

The recording layer detection unit 18 specifies the layers accessing the optical discs 1 and 5 mounted on the disc drive unit and detects the number of recording layers provided on the optical discs 1 and 6. Here, a method of detecting the layer being accessed will be described with reference to FIG. Optical disc 1,6
In each case, two recording layers are provided, and as described above, the first reflection films 2c and 7d and the second reflection films 3b and 8 of each layer are provided.
It is formed so as to have a different reflectance from b. Therefore, when the objective lens is moved in the optical axis direction of the objective lens across the in-focus position of each recording layer, the first record carrier 2,
The RF signal and the focusing error signal for each of the recording layers 7 and the recording layers of the second record carriers 3 and 8 are transferred to the first reflective film 2
It becomes an S-shaped curve with amplitude having large and small peak levels according to the reflectances of c and 7d and the second reflective films 3b and 8b.
The recording / reproducing apparatus 10 can specify the number of recording layers and the recording layer being accessed by detecting this amplitude.

Then, as shown in FIG. 8, the recording layer detector 18 moves the objective lens in the optical axis direction of the objective lens across the in-focus position of each recording layer in step S1. The amplitude of the obtained RF signal is detected,
A peak level equal to or higher than a preset threshold value is detected. As a result, the recording layer detection unit 18 can detect the number of recording layers of the optical discs 1 and 6 mounted in the disc drive unit, and the recording type record carrier 3 at the time of the first recording and reproduction of the optical discs 1 and 6. The number data of recording layers to be recorded in No. 7 is generated. Further, for example, the recording layer detection unit 18 is set in advance such that the lower peak level is the read-only record carrier 2 or 8 and the higher peak level is the record carrier 3 or 7 in advance. It is possible to specify whether or not the record carrier is being accessed. Needless to say, the recording layer detection unit 18 uses the read-only record carriers 2 and 8 whose peak level is higher, for example.
It is also possible to specify in advance which record carrier is being accessed by presetting the record carrier 3 or 7 with the lower peak level.

By the way, when the layer to be recorded / reproduced is specified based on the instruction of the system controller, in step S2, the recording layer detector 18 corresponds to the point where the S-shaped curve of the focusing error signal intersects with the 0 level. Position of the objective lens in the optical axis direction (hereinafter, zero-cross position)
Is obtained, and the process proceeds to step S3. In step S3,
The recording layer detection unit 18 determines that the RF signal at the zero-cross position is, for example, a threshold value TH ₁ or less when recording or reproducing the first record carrier 2 or 7, or the second record carrier 3 or the like.
When performing recording or reproduction of No. 8, it is determined whether the threshold value is TH ₂ or less. Thereby, the recording layer detection unit 18 can specify the recording layer of the record carrier to be accessed.
When any one of the conditions is satisfied, the recording layer detection unit 18 controls the servo control unit 17 to close the focus servo loop, assuming that the data is read from the recording layer of the record carrier and reproduced. As a result, the servo control unit 17
Performs focusing servo control and tracking servo control for the recording layer of the designated record carrier. In addition,
In this example, the thresholds of the RF signals are TH ₁ , TH ₁ ′, T
The upper limit and the lower limit may be set to H ₂ and TH ₂ ′, respectively.

As shown in FIG. 6, the switching section 19 connects the digital input terminal 22 and the error correction coding section 11 and also connects the recording layer detection section 18 and the error correction coding section 11 to each other.
And connect. Since the switching unit 19 records the number data of the recording layers of the optical disc detected by the recording layer detection unit 18 on the recording-type record carriers 3 and 6 at the time of the first recording / reproduction of the optical discs 1 and 6, the recording layer detection unit 18 and error correction coding unit 1
Connect with 1. Also, the switching unit 19 switches to connect the digital input terminal 22 and the error correction coding unit 11 when recording data on the recordable record carriers 3 and 7. Since it is not necessary to record the data at the time of reproducing the data, it may be turned off so that the data is not input to the error correction coding unit 11.

Further, the demodulation section 20 constituting the reproduction system performs demodulation processing of, for example, EFM-modulated data and outputs it to the error correction processing section 12. Error correction processing unit 21
Performs error correction decoding processing based on CIRC etc.,
It is output to the digital output terminal 23. The data input to the digital output terminal 22 is converted from a digital signal to an analog signal by, for example, a D / A converter, and is output from an output device such as a speaker, an earphone, or a monitor. Also, when the reproduced data is reproduction control data, a decryption key, or the like, it is output to a system controller, a decryption unit, or the like (not shown).

Next, the process of recording the number data of the recording layers on the recording type record carriers 3 and 7 with the optical disks 1 and 6 mounted on the recording and reproducing apparatus 10 configured as described above will be described with reference to FIG.
Will be described with reference to. First, in step S11,
When the optical discs 1 and 6 are mounted on the disc table that constitutes the disc drive unit, the motor 15 rotationally drives the optical discs 1 and 6 at CLV, and the recording layer detection unit 18 sets the objective lens to the first position as described above. The peak level of the amplitude of the RF signal is detected by moving in the optical axis direction across the first record carrier 2 and 7 and the second record carrier 3 and 8. And by detecting the peak level above the threshold,
The recording layer detector 18 detects the number of recording layers, that is, the number of stacked record carriers. Here, the recording layer detection unit 18 detects whether the first layer is a read-only type or a record type, or the second layer is a read-only type or a record type by detecting the magnitude of the peak level. The recording layer specifying data may be recorded on the recordable record carriers 3 and 7 by detecting whether it is the optical disc 1 or the optical disc 6. Then, the recording layer detector 18
Determines whether the optical disc mounted in the disc drive unit is the optical disc 1 or 6 in which two layers of record carriers are bonded, and when the disc is the optical disc 1 or 6, step S1
If the optical discs 1 and 6 are not selected, proceed to step S1.
Go to 5.

In step S12, the recording layer detector 1
8 outputs a signal for accessing the record-type record carriers 3 and 7 to the servo control unit 17, assuming that the record-type record carriers 3 and 7 have higher peak levels. Then, the servo control unit 17 controls the focusing and tracking of the objective lens of the optical pickup 14 so that recording and reproduction of the recording layer of the record-type record carriers 3 and 7 can be performed.

In step S13, the recording layer detector 1
Reference numeral 8 determines whether or not data has already been recorded on the signal recording films 3c and 7c, that is, whether or not it is the first recording, based on the input RF signal. If it is the first recording, the process proceeds to step S14, otherwise. It proceeds to step S15.

In step S14, the switching unit 19
The recording layer detection unit 18 and the error correction coding unit 11 are connected, and the recording layer detection unit 18 outputs the number data of the recording layers to the error correction coding unit 11. Then, this number data is
An error correction code such as CIRC is added by the error correction encoding unit 11, then modulated by a modulation unit 12 by a method such as EFM, recorded by a recording processing unit 13, and output to an optical pickup 14. It The optical pickup 14
For example, in the lead-in area of the optical discs 1 and 6, the TOC
Record some data with (table of contents). Thus, when recording is performed on the optical discs 1 and 6 from the next time, the number of recording layers of the optical disc mounted in the disc drive unit can be specified by immediately reading the number data.

When it is determined in step S13 that it is not the first recording, in step S15, the recording / reproducing apparatus 10 performs a normal recording / reproducing operation, that is, the operation shown in FIGS.

Next, the optical disk 1 having the recording-type second recording carrier 3 bonded to the reproduction-only type first recording carrier 2 shown in FIGS. The process at that time will be described with reference to FIG. First, in step S21, when the optical disc 1 is mounted on the disc table that constitutes the disc drive unit, the motor 15 rotationally drives the optical disc 1 at CLV, and the recording layer detection unit 18 causes the objective lens to move as described above. Moves in the optical axis direction across the first record carrier 2 and the second record carrier 3 to detect the peak level of the amplitude of the RF signal. Then, by detecting the peak level equal to or higher than the threshold value, the recording layer detection unit 18 determines whether or not the optical disc 1, that is, an optical disc having two recording layers, is loaded in the disc drive unit, and the optical disc 1 is loaded. If so, the process proceeds to step S22. If the recording layer is a single-layer optical disc, the process proceeds to step S25. In step S22, the recording / reproducing apparatus 10 determines whether or not it is the mode for recording data, and when it is in the recording mode, step S22.
23, and when not in the recording mode, the process proceeds to step S26. The identification of the optical disc 1 may be performed based on the specific data recorded on the recordable record carrier 3.

In step S23, the recording layer detector 1
8 outputs a signal to the servo control unit 17 so as to access the second record carrier 3 which is the second layer. That is,
As described above with reference to FIG. 8, the recording layer detection unit 18 obtains the position in the optical axis direction of the objective lens (hereinafter, zero-cross position) corresponding to the point where the S-shaped curve of the focusing error signal intersects with the 0 level, and the zero-cross position is obtained. It is determined whether the RF signal at the position is equal to or less than a threshold value for recording data on the second record carrier 3, and when it is less than this threshold value, the second record carrier 3 serving as the second layer is accessed. To the servo control unit 17.

Then, in step S24, the recording / reproducing apparatus 10 records the data on the second record carrier 3 of the optical disc 1. That is, first, the switching unit 19 connects the digital input terminal 22 and the error correction coding unit 11 so that the recording data can be input to the error correction coding unit 11 from the digital input terminal 22. When the recording data is input from the digital input terminal 22, the recording data is added with an error correction code such as CIRC in the error correction coding unit 11, and then in the modulation unit 12 E
After being modulated by a system such as FM, the recording processing unit 13 performs recording processing, and then outputs to the optical pickup 14. The optical pickup 14 records the record data on the signal recording film 3c of the second record carrier 3 of the optical disc 1.

When it is determined in step S21 that the recording layer is not the two-layer optical disc 1, the servo control unit 17
Performs servo control to access the read-only first record carrier 2 that is the first recording layer. Then, the optical pickup 14 uses the first reflection film 2c of the first record carrier 2.
The light beam is irradiated so as to be focused on, and the returning light beam reflected is detected. Then, the optical pickup 14
The detection signal is output to the RF amplifier 16. RF amplifier 16
Generates an RF signal and outputs it to the demodulation unit 20. The demodulation unit 20 demodulates the input data based on the EFM conversion table, and the error correction processing unit 21 performs error correction processing. Thus, the error-corrected data is output from the digital output terminal 23, converted from a digital signal to an analog signal by, for example, a D / A converter, and output from an output device such as a speaker, an earphone, or a monitor.

When it is determined in step S22 that the recording mode is not set, the recording / reproducing apparatus 10 determines in step S26 whether or not to reproduce the data recorded on the first record carrier 2 which is the first layer, If the data recorded on the first record carrier 2 is to be reproduced, the process proceeds to step S27, and if not, the process proceeds to step S29.

In step S27, the servo control unit 1
Reference numeral 7 performs focusing servo control and tracking servo control of the optical pickup 14 so that the data recorded on the first record carrier 2 of the optical disc 1 can be read. Then, in step S28, the optical pickup 14 photoelectrically converts the returning light beam reflected by the first reflection film 2c of the first record carrier 2 with a photodetector, and outputs this detection signal to the RF amplifier 16. To do. The RF signal generated by the RF amplifier 16 is demodulated by the demodulation unit 20, subjected to error correction processing by the error correction processing unit 21, and then output from the digital output terminal 23. This data is output from the digital output terminal 23 and, for example, D
The digital signal is converted into an analog signal by the / A converter and output from an output device such as a speaker, an earphone, or a monitor.

When the data recorded on the first record carrier 2 which is the first layer is not reproduced in step S26, the servo control section 17 causes the second record carrier 3 of the optical disc 1 to be reproduced in step S29. The optical pickup 14 is provided so that the recorded data can be read.
Focusing servo control and tracking servo control are performed. Then, the optical pickup 14 performs the step S3.
At 0, the returning light beam reflected by the second reflection film 3b of the second record carrier 3 is photoelectrically changed by the photodetector, and this detection signal is output to the RF amplifier 16. RF amplifier 16
The RF signal generated in (1) is demodulated in the demodulation unit 20, subjected to error correction processing in the error correction processing unit 21, and then output from the digital output terminal 23. This data is output from the digital output terminal 23, converted from a digital signal to an analog signal by, for example, a D / A converter,
Output from output devices such as speakers, earphones, and monitors. Also, when the reproduced data is reproduction control data, a decryption key, or the like, these data are output to a system controller, a decryption unit, or the like (not shown).

Next, the recording / reproducing apparatus 10 was loaded with the optical disk 6 in which the read-only second record carrier 8 shown in FIGS. 3 and 4 was attached to the read-only second record carrier 8. The process at that time will be described with reference to FIG. First, in step S31, when the optical disk 6 is mounted on the disk table that constitutes the disk drive unit, the motor 15 rotationally drives the optical disk 6 at CLV, and the recording layer detection unit 18 causes the objective lens to move as described above. Moves in the optical axis direction across the first record carrier 7 and the second record carrier 8 to detect the peak level of the amplitude of the RF signal. Then, by detecting the peak level equal to or higher than the threshold value, the recording layer detection unit 18 determines whether or not the optical disc 6, that is, an optical disc having two recording layers, is mounted in the disc drive unit, and the optical disc 6 is mounted. If so, the process proceeds to step S32. If the recording layer is a single-layer optical disc, the process proceeds to step S35. In step S32, the recording / reproducing device 10 determines whether or not it is the mode for recording data, and when it is the recording mode, step S32
If the recording mode is not set, the process proceeds to step S39. The identification of the optical disc 6 may be performed based on the specific data recorded on the recordable record carrier 7.

In step S33, the recording layer detector 1
8 outputs a signal to the servo controller 17 so as to access the first record carrier 7 which is the first layer. That is,
As described above with reference to FIG. 8, the recording layer detection unit 18 obtains the position in the optical axis direction of the objective lens (hereinafter, zero-cross position) corresponding to the point where the S-shaped curve of the focusing error signal intersects with the 0 level, and the zero-cross position is obtained. It is determined whether the RF signal at the position is equal to or less than a threshold value for recording data on the first record carrier 7, and when the RF signal is less than or equal to the threshold value, the first record carrier 7 as the first layer is accessed. To the servo control unit 17.

Then, in step S34, the recording / reproducing apparatus 10 records the data on the first record carrier 7 of the optical disk 6. That is, first, the switching unit 19 connects the digital input terminal 22 and the error correction coding unit 11 so that the recording data can be input to the error correction coding unit 11 from the digital input terminal 22. When the recording data is input from the digital input terminal 22, the recording data is added with an error correction code such as CIRC in the error correction coding unit 11, and then in the modulation unit 12 E
After being modulated by a system such as FM, the recording processing unit 13 performs recording processing, and then outputs to the optical pickup 14. The optical pickup 14 records the record data on the signal recording film 7c of the first record carrier 7 of the optical disc 6.

When it is determined in step S31 that the recording layer is not the dual-layer optical disc 6, the servo control unit 17
Performs servo control so as to access the recording type first record carrier 7, which is the first recording layer. In step S36, the recording / reproducing apparatus 10 determines whether or not it is the mode for recording data, and when it is the recording mode, step S3
If the recording mode is not set, the process proceeds to step S38.

In step S37, the recording layer detector 1
Reference numeral 8 outputs a signal to the servo control unit 17 so as to access the first record carrier 7, which is the first layer, and the servo control unit 17 performs focusing servo control so that the first record carrier 7 can be accessed. And perform tracking servo control. Then, the optical pickup 14 records the data input from the digital input terminal 22 on the signal recording film 7c.

If the recording mode is not set, step S
At 38, the recording / reproducing apparatus 10 reproduces the data recorded on the recordable first record carrier 7. That is,
The optical pickup 14 photoelectrically changes the returning light beam reflected by the first reflection film 7d of the first record carrier 7 with a photodetector, and outputs this detection signal to the RF amplifier 16. RF
The RF signal generated by the amplifier 16 is demodulated by the demodulation unit 20, subjected to error correction processing by the error correction processing unit 21, and then output from the digital output terminal 23. This data is output from the digital output terminal 23, converted from a digital signal to an analog signal by, for example, a D / A converter, and output from an output device such as a speaker, an earphone, or a monitor.

When it is determined in step S32 that the recording mode is not set, the recording / reproducing apparatus 10 determines in step S39.
In step S4, it is determined whether or not the data recorded on the first record carrier 7 which is the first layer is to be reproduced, and the data recorded on the first record carrier 7 is reproduced.
0, otherwise go to step S42.

At step S40, the servo controller 1
Reference numeral 7 performs focusing servo control and tracking servo control of the optical pickup 14 so that the data recorded on the first record carrier 7 of the optical disc 6 can be read. Then, in step S 41, the optical pickup 14 detects the light beam reflected by the first reflection film 7 d, photoelectrically converts the light beam, and outputs the light beam to the RF amplifier 16. The RF signal generated by the RF amplifier 16 is demodulated and error-corrected, and then output from the digital output terminal 23. It is output from the digital output terminal 23.
This data is output from the digital output terminal 23,
For example, a digital signal is converted into an analog signal by a D / A converter and output from an output device such as a speaker, an earphone, and a monitor. Also, when the reproduced data is reproduction control data, a decryption key, etc., these data are
It is output to a system controller (not shown), a decryption unit, etc.

When the data recorded on the first record carrier 2 which is the first layer is not reproduced in step S42, the servo controller 17 is executed in step S42.
Performs focusing servo control and tracking servo control of the optical pickup 14 so that the data recorded on the second record carrier 8 of the optical disc 6 can be read. Then, in step S43, the optical pickup 14 detects the light beam reflected by the second reflective film 8b, photoelectrically converts it, and outputs it to the RF amplifier 16. The RF signal generated by the RF amplifier 16 is demodulated and error-corrected, and then output from the digital output terminal 23. This data is output from the digital output terminal 23, converted from a digital signal to an analog signal by, for example, a D / A converter, and output from an output device such as a speaker, an earphone, or a monitor. Also, when the reproduced data is reproduction control data, a decryption key, or the like, these data are output to a system controller, a decryption unit, or the like (not shown).

According to the recording / reproducing apparatus 20 as described above,
First record carrier 2, 7 as shown in FIGS. 1 to 4 above
An optical disc 1, in which a second record carrier 3 and 8 are attached to
Recording and reproduction of 6 can be performed. The optical discs 1 and 6 have a thickness of about 1.2 mm, and the physical format is almost the same as that of an existing compact disc or digital versatile disc. With 6, the recording / reproducing of the existing recording medium such as a compact disc or a digital versatile disc can be performed.

As described above, the second recording carrier 3 or 8 of the recording type or the reproducing only type is attached to the first recording carrier 2 or 7 of the reproducing only type or the recording type serving as the substrate, and the recording layer is formed. The description has been given by taking the two-layer optical discs 1 and 6 as an example.
The present invention is not limited to this, and a plurality of recording carriers may be attached to the first recording carriers 2 and 7 serving as substrates, and the number of recording layers may be three or more.

[0084]

According to the present invention, the first record carrier of the read-only type or the record type is joined to the second record carrier of the record-type or the read-only type having a property different from that of the first record carrier. By being able to do so, the application can be provided to the user in various forms without being restricted by the property of the optical disc.

[Brief description of drawings]

FIG. 1 is a perspective view illustrating a state where a first record carrier and a second record carrier of an optical disc to which the present invention is applied are separated.

FIG. 2 shows a second record for the first record carrier of the optical disc.
FIG. 6 is a cross-sectional view illustrating an optical disc having the record carrier of FIG.

FIG. 3 is a first example of an optical disc of another example to which the present invention is applied.
It is a perspective view explaining the state where the record carrier and the second record carrier are separated.

FIG. 4 shows a second record for the first record carrier of the optical disc.
FIG. 6 is a cross-sectional view illustrating an optical disc having the record carrier of FIG.

FIG. 5 is a block diagram of a recording / reproducing apparatus for recording / reproducing the optical disc.

FIG. 6 is a diagram illustrating a configuration of a photodetector and an RF amplifier.

FIG. 7 is a diagram illustrating an RF signal and a focusing error signal.

FIG. 8 is a flowchart illustrating a method of detecting the number of recording layers of an optical disc mounted in the disc drive unit and further specifying a recording layer to be recorded / reproduced.

FIG. 9 is a flowchart illustrating processing when an optical disc is mounted in the recording / reproducing apparatus and the number data of recording layers is recorded on a recordable record carrier.

10 is a flowchart illustrating an operation of the recording / reproducing apparatus when the optical disc shown in FIGS. 1 and 2 is mounted.

FIG. 11 is a flowchart illustrating an operation of the recording / reproducing apparatus when the optical disc shown in FIGS. 3 and 4 is mounted.

[Explanation of symbols]

1 optical disc, 2 first record carrier (playback only type), 2
a disk substrate, 2b pit pattern, 2c first reflective film, 2d protective film, 3 second record carrier (recording type), 3a sheet body, 3b second reflective film, 3c signal recording film, 3d adhesive layer, 6 optical disk, 7 first record carrier (recording type), 7a disk substrate, 7b groove pattern, 7c signal recording film, 7d first reflecting film, 7e protective film, 8 second record carrier (reproducing only type), 8a sheet body, 8b second reflective film, 8c adhesive layer

Claims (35)

[Claims] 1. A first record carrier of read-only type having a light-transmitting property and having a recording layer in which data is previously recorded by repeating pits and lands, and data can be recorded by irradiation of a light beam. And a second record carrier of a recording type provided with a recording layer, the second record carrier being bonded to a surface of the first record carrier opposite to a surface on which a light beam is incident. Data recording medium. 2. The second record carrier has a sheet-shaped substrate, the substrate is provided with a recording layer capable of recording data, and one surface side of the substrate is used as the first record carrier. The data recording medium according to claim 1, which is a joint surface of 3. The data indicating the number of stacked record carriers is recorded in the recording layer of the second record carrier.
The data recording medium described. 4. Key data for controlling reproduction of data recorded on the first record carrier to which the second record carrier is joined is recorded on the recording layer of the second record carrier. Item 1. The data recording medium according to item 1. 5. The data recording medium according to claim 1, wherein key data of the encrypted data recorded on the first record carrier is recorded on the recording layer of the second record carrier. 6. The data recording medium according to claim 1, wherein the recording layer of the second record carrier has recorded therein data which is being reproduced from the data read from the first record carrier. 7. The data recording medium according to claim 1, wherein still image data is recorded on the recording layer of the second record carrier. 8. The data recording medium according to claim 1, wherein audio data relating to the music data recorded on the first record carrier is recorded on the recording layer of the second record carrier. 9. A recordable first record carrier provided with a recording layer having a light transmitting property and capable of recording data by irradiation of a light beam, and data is previously recorded by repeating pits and lands. A read-only second record carrier having a formed recording layer, the second record carrier being bonded to the surface of the first record carrier opposite to the surface on which the light beam is incident. Data recording medium. 10. The second record carrier has a sheet-shaped substrate, and the substrate is provided with a recording layer in which data is previously recorded by repeating pits and lands, and one surface side of the second record carrier is the first layer. The data recording medium according to claim 9, wherein the data recording medium is a surface to be bonded to one record carrier. 11. The data recording medium according to claim 9, wherein data indicating the number of stacked record carriers is recorded on the recording layer of the first record carrier. 12. Key data for controlling reproduction of data recorded on the second record carrier to which the first record carrier is joined is recorded on a recording layer of the first record carrier. Item 9. The data recording medium according to item 9. 13. The data recording medium according to claim 9, wherein key data of the encrypted data recorded on the second record carrier is recorded on the recording layer of the first record carrier. 14. The data recording medium according to claim 9, wherein the recording layer of the first record carrier stores data in the middle of reproduction of the data read from the second record carrier. 15. The data recording medium according to claim 9, wherein still image data is recorded on the recording layer of the first record carrier. 16. The data recording medium according to claim 9, wherein audio data related to the music data recorded on the second record carrier is recorded on the recording layer of the first record carrier. 17. A sub-recording device, which has a light-transmitting property and is bonded to a read-only main recording medium having a recording layer in which data is pre-recorded by repeating pits and lands, to form a multi-layer data recording medium. The medium is a sub-recording medium having a sheet-shaped substrate, on which a recording layer capable of recording data is formed, and one surface side being a bonding surface to the main recording medium. 18. The sub-recording medium according to claim 17, wherein data indicating the number of stacked recording media is recorded on the recording layer. 19. The sub recording medium according to claim 17, wherein key data for controlling reproduction of main data recorded on the main recording medium to which the sub recording medium is joined is recorded on the recording layer. 20. The sub-recording medium according to claim 17, wherein key data for controlling reproduction of main data recorded on the main recording medium to which the sub-recording medium is joined is recorded on the recording layer. 21. The sub-recording medium according to claim 17, wherein the recording layer is recorded with data which is being reproduced from the main data read from the main recording medium. 22. The sub-recording medium according to claim 17, wherein still image data is recorded on the recording layer. 23. The sub-recording medium according to claim 17, wherein audio data relating to the music data recorded on the main recording medium is recorded on the recording layer. 24. A sub-layer which is a multi-layer type data recording medium and which is joined to a recording type main recording medium having a recording layer having a light transmitting property and capable of recording data by irradiation of a light beam. The recording medium has a sheet-shaped substrate, on which a recording layer in which data is recorded in advance is formed by repeating pits and lands, and a sub recording in which one surface side is a bonding surface to the main record carrier. Medium. 25. The sub-recording medium according to claim 24, wherein the data is encrypted and recorded. 26. A recording-type record carrier having a recording layer capable of recording data and a read-only record carrier having a recording layer in which data is previously recorded by repeating pits and lands are laminated. In a data recording device for recording data on a data recording medium, an optical pickup for irradiating each recording layer of the mounted data recording medium with a light beam and detecting a light beam reflected from the recording layer, A recording layer detection unit that detects a recording layer of the data recording medium based on a detection output obtained from the optical pickup, and the optical pickup indicates the number of recording layers detected by the recording layer detection unit. A data recording device for recording data on the recording layer of the recordable record carrier. 27. The data according to claim 26, wherein the optical pickup detects a light beam reflected from the recording layer by changing a focus position of a light beam emitted from a light source in a stacking direction of the record carriers. Recording device. 28. The data recording device according to claim 27, wherein the recording layer detecting section detects the number of recording layers by detecting a peak of a level of a detection signal detected by the optical pickup. 29. A recordable record carrier provided with a record layer capable of recording data and a read-only record carrier having a record layer in which data is previously recorded by repeating pits and lands are laminated. The recording layer of the data recording medium is irradiated with a light beam, the light beam reflected from each recording layer of the data recording medium is detected, and the number of recording layers stacked on the recording medium based on the detection output. And then recording data indicating the number of the detected recording layers on the recording layer of the recordable record carrier. 30. The data recording method according to claim 29, wherein the light beam is applied to the recording medium by changing the focal point position in the stacking direction of the record carriers. 31. The data recording method according to claim 30, wherein the number of recording layers is detected by detecting the light beam reflected from the recording layer of the recording medium and detecting the peak of the level of the detection signal. 32. A record-type record carrier having a record layer capable of recording data and a read-only record carrier having a record layer in which data is previously recorded by repeating pits and lands are laminated. In a data recording device for recording data on a data recording medium, an optical pickup for irradiating each recording layer of the mounted data recording medium with a light beam and detecting a light beam reflected from the recording layer, A recording layer detection unit for detecting a recording layer of the recording type record carrier based on a detection output obtained from the optical pickup, wherein the optical pickup has the recording type recording detected by the recording layer detection unit. A data recording device for recording data on a recording layer of a carrier. 33. A recordable record carrier provided with a record layer capable of recording data and a read-only record carrier having a record layer in which data is previously recorded by repeating pits and lands are laminated. And irradiating each recording layer of the data recording medium with a light beam, detecting the recording layer of the recordable record carrier based on the detection output obtained from the photodetector, and then detecting the recordable record carrier. Data recording method for recording data on the recording layer of the. 34. A recording-type record carrier having a recording layer capable of recording data and a read-only record carrier having a recording layer in which data is previously recorded by repeating pits and lands are laminated. In a data reproducing device for reproducing data recorded on a data recording medium, an optical pickup for irradiating each recording layer of the mounted data recording medium with a light beam and detecting a light beam reflected from the recording layer, A recording layer detection unit that detects a light beam reflected from the recording layer of the data recording medium and detects a recording layer on which data is recorded based on the detection output, the optical pickup comprising: A data reproducing device for reading a recording layer in which the above-mentioned data detected by a layer detecting section is recorded. 35. A recordable record carrier provided with a record layer capable of recording data and a read-only record carrier having a record layer in which data is previously recorded by repeating pits and lands are laminated. Irradiating each recording layer of the data recording medium with a light beam, detecting the light beam reflected from the recording layer of the data recording medium, and detecting the recording layer on which data is recorded based on the detection output, Next, a data reproducing method of reading the recording layer on which the detected data is recorded.