JP2005129148A - Optical disk device and disk discriminating method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical disk device and a disk discriminating method capable of discriminating an optical disk into which information is recorded in a high density recording mode while adverse effect being applied onto an existing mechanism is made small. <P>SOLUTION: In the optical disk device in which recording/playing-back is conducted in accordance with a second format having higher recording density than a first format that is defined as an optical disk recording/playing-back standard, a binary code is beforehand set to indicate that the optical disk is in a state where recording is conducted in accordance with the second format. When recording is to be conducted for an optical disk in accordance with the second format, a control means is provided to record the binary code in an un-set area that is located at the inner periphery side than a data area of the optical disk where setting is performed based on the first format. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an optical disc device and an optical disc discrimination method.

  As one of the standards of optical discs that can record and reproduce information using laser light, CD (Compact Disk) such as data write once CD-R and rewritable CD-RW ) There is a standard. In recent years, CD-R and CD-RW discs have been widely used because of their widespread use in conjunction with lower prices.

  In an optical disc (CD medium) that conforms to a CD format that can be recorded / reproduced, a pre-groove (guide groove) that forms a recording track is wobbled according to a waveform that is FM-modulated by absolute time information or the like ( Meandering). By demodulating the wobbling frequency from the pregroove, an ATIP (Absolute time In Pregroove) address that is absolute time information can be acquired. The ATIP address is used as management information for managing the recording and reproducing position of data on the CD medium in an optical disc apparatus that records and reproduces data according to the data format (data structure) of the CD standard. .

  By the way, the recording capacity of CD-R and CD-RW discs is about 650 Mbytes and 700 Mbytes as a standard. In recent years, there is a high demand for recording a larger capacity on an optical disk medium for video recording applications and the like, and the standard recording capacity of CD media such as CD-R and CD-RW disks cannot meet such needs.

  Therefore, an optical disk device that supports a high-density recording mode for recording and reproducing data using a data format (data structure) having a higher format efficiency than the CD standard such as the DVD (Digital Versatile Disk) standard is proposed. (Hereinafter referred to as a conventional optical disc apparatus). For example, in the DVD format data format, ID (Identification Data) information for identifying the sector is recorded in the header section of the sector set on the optical disc (DVD medium).

A conventional optical disk apparatus performs high-density recording on an optical disk (CD medium) by using a high-density recording address associated with the ID information (see, for example, Patent Document 1 shown below). .
JP 2002-56617 A

  By the way, in the conventional optical disk apparatus, there are a case where recording is performed on a CD medium in a CD standard format (standard recording mode) and a case where recording is performed in a DVD standard format (high density recording mode). As a result, there are two types of CD media recorded in the standard recording mode and CD media recorded in the high-density recording mode even though they are the same CD media. Therefore, in the conventional optical disc apparatus, it is necessary to take measures in advance so that these two types of CD media can be accurately discriminated in another optical disc apparatus such as a CD player.

  Therefore, for example, when recording a CD medium in the high-density recording mode, the conventional optical disk apparatus may record identification data indicating that the recording is performed in the high-density recording mode. In this case, since the above-described identification data is recorded in the DVD standard format, when the other optical disc apparatus reproduces the CD medium recorded in the high-density recording mode, the above-described identification data is read out. It is necessary to provide a high-density recording mode decoder (DVD dedicated decoder) for decoding data recorded in the DVD standard format.

  Therefore, other optical disc apparatuses that do not include the high-density recording mode decoder cannot correctly determine the CD medium recorded in the high-density recording mode. In this case, although the CD medium is normally recorded in the high-density recording mode, it may be determined as a disk error. In the worst case, the user erases the contents recorded on the CD medium by mistake. There is a possibility that.

  Therefore, in order to accurately discriminate CD media recorded in the high-density recording mode in another optical disc apparatus, it is necessary to provide a high-density recording mode decoder, but a standard recording mode decoder (CD dedicated decoder) In another optical disc apparatus having the above, there is a problem that separately incorporating a high-density recording mode decoder leads to an increase in manufacturing cost and apparatus scale.

  An object of the present invention is to provide an optical disc apparatus and an optical disc discriminating method capable of discriminating an optical disc recorded in a high-density recording mode with less influence on an existing mechanism.

  A main aspect of the present invention for solving the above problems is an optical disc apparatus that performs recording / reproduction according to a second format having a higher recording density than the first format defined as a recording / reproduction standard for optical discs. When a binary code indicating that the optical disk is recorded in conformity with the second format is set in advance and recording is performed on the optical disk in conformity with the second format, And a control unit for recording the binarized code in an unset area located on the inner circumference side of the data area of the optical disc set based on the format of 1.

  Other features of the present invention will become apparent from the accompanying drawings and the description of this specification.

  According to the present invention, it is possible to discriminate an optical disc recorded in a data format of high-density recording with less influence on an existing mechanism.

=== Example ===
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

<Optical disk device configuration>
A schematic configuration of an optical disc apparatus 100 according to an embodiment of the present invention will be described with reference to FIG. Here, the optical disk apparatus 100 shown in FIG. 1 uses a CD standard data format (“first format”) for an optical disk (CD medium) 200 conforming to an existing CD standard disk format. Standard recording mode for recording and reproduction, and data format such as DVD standard, which has higher format efficiency than the CD standard, that is, the size of redundant data added to recorded data such as error correction code is small (low redundancy) (“Second format”) is used to select and execute one of the high-density recording modes for recording and reproducing data.

  First, in the optical disc (CD medium) 200, a pre-groove (guide groove) that forms a recording track is wobbling (meandering) in accordance with a waveform that is FM-modulated by absolute time information or the like. By demodulating the wobbling frequency from this pregroove, it is possible to obtain an ATIP (Absolute Time In Pregroove) address that is absolute time information.

  As shown in the figure, the optical disk apparatus 100 includes an optical head 1, a front end processing unit 2, an optical head servo circuit 3, an RF signal binarization processing unit 4, a WBL detection unit 5, an ATIP decoder 6, a PSN decoder 7, a PLL. A circuit 8, a high-density recording mode decoder 9, a standard recording mode decoder 10, a high-density recording mode encoder 11, a standard recording mode encoder 12, an interface unit 13, a RAM 14, a system control microcomputer ("control means") 15, A laser output control circuit 16, a laser drive circuit 17, a spindle motor 18, a motor drive circuit 19, and a motor control circuit 20 are included.

  The optical head 1 includes an objective lens (not shown), a laser element 1a that emits laser light to the optical disc 200 via the objective lens, a light receiving element (not shown) that receives reflected light from the optical disc 200, and the like. Is incorporated. Further, the optical head 1 has a slide mechanism for moving the optical head 1 to a recording / reproducing target recording track, and control for tracking the laser light emitted to the optical disc 200 to the recording / reproducing target recording track (tracking control). And a tracking mechanism for performing a control (focus control) for correcting defocusing of the laser light emitted to the optical disc 200 (all not shown).

  The front-end processing unit 2 is a tracking error signal based on an RF amplifier, a three-beam method, a push-pull method, a DPD (Differential Phase Detection) method, etc. composed of a matrix arithmetic circuit, an amplifier circuit, a waveform shaping circuit (equalizer), etc. A generation circuit, a focus error signal generation circuit based on an astigmatism method, a Foucault method, and the like (all not shown) are provided.

  The RF amplifier is an RF signal for identifying the presence / absence of a pit on a recording track to be recorded / reproduced based on an electrical signal generated according to the amount of light received by a light receiving element (not shown) of the optical head 1. Is generated. The RF signal includes a wobbling frequency component for acquiring an ATIP address. Further, when the optical disc 200 is recorded in high density in advance, the RF signal includes ID information described later.

  The tracking error signal generation circuit has a tracking control mechanism for the optical head 1 based on an electrical signal generated in accordance with the amount of light received by the light receiving element (not shown) of the optical head 1 in the same manner as the RF amplifier described above. A tracking error signal for servo control is generated. Similarly, the focus error signal generation circuit generates a focus error signal for servo-controlling the focus control mechanism of the optical head 1 based on the electrical signal of the light receiving element (not shown).

  The optical head servo circuit 3 is a servo mechanism (tracking servo mechanism or focus servo) incorporated in the optical head 1 based on various error signals (tracking error signal, focus error signal, etc.) generated by the front end processing unit 2. Servo control signal for driving the mechanism etc. is generated. Then, the servo mechanism is servo-controlled based on the servo control signal.

  The RF signal binarization processing unit 4 receives the RF signal output from the RF amplifier of the front end processing unit 2 and performs processing for binarizing the RF signal. For example, it can be configured by a comparator. The RF signal binarization processing unit 4 transmits a binarized RF signal to the system control microcomputer 15.

  The WBL detection unit 5 includes a BPF (Band Pass Filter) circuit, a comparator, and the like. The BPF circuit receives the RF signal generated by the front end processing unit 2 and extracts a wobbling frequency component (center frequency 22.05 kHz). The comparator generates a binary WBL (Wobble) signal by comparing the wobbling frequency component and the reference voltage, and transmits the signal to the ATIP decoder 6 and the motor control circuit 20.

  The ATIP decoder 6 decodes the WBL signal per ATIP section received from the WBL detection unit 5 to generate an ATIP address. Note that the WBL signal per ATIP section includes a synchronization detection pattern, identification information for individually identifying the optical disc 200 such as a manufacturer and disc type, wobbling information including an ATIP address, etc., and bits of the wobbling information CRC data for detecting an error is included (see FIG. 2).

  The ATIP decoder 6 has a CRC check circuit 6a. The CRC check circuit 6a performs a CRC check based on the aforementioned CRC data in order to identify whether or not the ATIP address has been normally decoded from the WBL signal per ATIP section. The ATIP address decoding result check method is not limited to the CRC check method. For example, a parity check method using parity bits or an ECC check method using ECC (Error Correcting Code) is adopted. May be.

  When the optical disc 200 is in an unrecorded state, the PSN decoder 7 receives the ATIP address decoded by the ATIP decoder 6 and converts it into a PSN address as a high-density recording address. On the other hand, when the optical disc 200 is in a high-density recorded state, the PSN decoder 7 receives ID (Identification Data) information included in the RF signal from the front end processing unit 2 and converts it into a PSN address. The ID information is information for the optical disc apparatus 100 to identify each divided area logically divided by the PSN address on the recording track, and is recorded on the optical disc 200 together with the recording data and the parity bit. (See FIG. 3).

  The PLL circuit 8 includes a phase comparator, a charge pump, an LPF, a VCO, a frequency divider circuit, and the like. In this configuration, the PLL circuit 8 generates a clock signal used as a timing signal for decoding processing at the time of data reproduction in the standard recording mode or the high density recording mode based on the WBL signal received from the WBL detection unit 5. Generate.

  The high-density recording mode decoder 9 performs a decoding process corresponding to the data format of the DVD standard when reproducing in the high-density recording mode. Note that the DVD standard data format employs EFM-plus (8/16 modulation) as a modulation code and RS-ProductCode as an error correction code. Therefore, the high-density recording mode decoder 9 decodes based on the above-described modulation code and error correction code based on the clock signal generated by the PLL circuit 8 and the RF signal detected by the front-end processing unit 2. Process.

  The standard recording mode decoder 10 performs a decoding process corresponding to the data format of the CD standard when reproducing in the standard recording mode. Note that the CD standard data format employs EFM (8/14 modulation) as a modulation code and CIRC as an error correction code. Therefore, the standard recording mode decoder 10 is based on the clock signal generated by the PLL circuit 8 and the RF signal detected by the front end processing unit 2 and performs decoding processing based on the modulation code and error correction code. I do.

  The high-density recording mode encoder 11 performs encoding processing corresponding to the data format of the DVD standard on recording data input via an interface unit 14 from an information processing apparatus (not shown) such as a personal computer. This encoding process includes a process for configuring one ECC block which is an error correction unit at the time of recording / reproduction, an EFM-plus modulation process, a scramble process, and the like. The modulation signal is transmitted to the laser output control circuit 16.

  The standard recording mode encoder 12 performs an encoding process corresponding to the data format of the CD standard on the recording data input via an interface unit 14 from an information processing apparatus (not shown) such as a personal computer. This encoding processing includes CIRC encoding processing, which is an error correction unit at the time of recording / reproduction, EFM modulation processing, and scramble processing, etc., and laser output control of the modulation signal for recording after these processing is performed Transmit to circuit 16.

The interface unit 13 controls transmission / reception of recording / reproduction data between the optical disc apparatus 100 and an information processing apparatus (not shown) such as a personal computer.
When the reproduction request is received from the information processing apparatus (not shown) via the interface unit 13, the RAM 14 temporarily stores intermediate data being decoded in the high-density recording mode decoder 9 and reproduction data after the decoding process. To do. The temporarily stored reproduction data is transmitted to the information processing apparatus (not shown) via the interface unit 13.
The RAM 14 temporarily stores recording data received via the interface unit 13 from the information processing apparatus (not shown). The temporarily stored recording data is accessed during the encoding process by the high-density recording mode encoder 11.

  A system control microcomputer (“control means”) 15 controls the overall system control of the optical disc apparatus 100 related to recording and reproduction of the optical disc 200. For example, when the system control microcomputer 15 receives either a standard recording mode or a high-density recording mode from the information processing apparatus (not shown) and receives a recording request command including a PSN address, Control is performed to execute an encoding process corresponding to the designated recording mode for the recording data to the recording area associated with the PSN address. Similarly, when the system control microcomputer 15 receives either a standard recording mode or a high-density recording mode from the information processing apparatus (not shown) and receives a playback request command including a PSN address, Control is performed to execute decoding processing corresponding to the designated recording mode for data reproduced from the recording area associated with the PSN address.

In addition, the system control microcomputer 15 particularly realizes the function of the disk discrimination processing unit 15a by firmware (program) or hardware.
Based on the identification information of the optical disc 200 received from the ATIP decoder 6, the disc discrimination processing unit 15a discriminates the manufacturer of the optical disc 200, the disc type, and the like. Note that the optical disc apparatus 100 prohibits recording data in different recording modes (data formats) from being mixed on the same disc. Therefore, when the optical disc 200 is already recorded, the disc discrimination processing unit 15a performs mode discrimination as to whether recording is performed in either the standard recording mode or the high-density recording mode. With respect to this determination method, for example, the data size recorded for one ATIP section is measured based on the clock signal generated by the PLL circuit 8, and the mode determination is performed based on the measured data size.

  The laser output control circuit 16 generates a pulse signal for laser light emission driving of the laser element 1a on the basis of the recording modulation signal received from the high-density recording mode encoder 11 or the standard recording mode encoder 12. Transmit to circuit 17. Further, the laser output control circuit 16 executes OPC for setting an optimum recording power value of the laser light emitted from the laser element 1 a under the control of the system control microcomputer 15.

  Based on the pulse signal received from the laser output control circuit 16, the laser drive circuit 17 drives the laser element 1a to emit light during recording. As a result, laser light is emitted from the laser element 1a, and pits corresponding to the recording modulation signal output from the high-density recording mode encoder 11 or the standard recording mode encoder 12 are formed on the recording track of the optical disk.

  The spindle motor 18 is a motor that rotationally drives the optical disc 200, and the motor drive circuit 19 is a circuit that rotationally drives the spindle motor 18. The motor control circuit 20 is a circuit for performing rotational drive control of the spindle motor 18 by a constant linear velocity method according to the CD standard using information on the wobbling frequency based on the WBL signal received from the WBL detection unit 5. Alternatively, rotation drive control of the spindle motor 18 may be performed by a constant angular velocity method using a pulse signal generated according to the rotation of the spindle motor 18.

  The outline of the main components of the optical disc apparatus 100 has been described above. The optical disc apparatus 100 may be provided with a mechanism for performing recording / reproduction only in the high-density recording mode. For example, the optical disc apparatus 100 may not include the standard recording mode decoder 10 and the standard recording mode encoder 12.

<Data format>
=== Standard recording mode ===
First, the data format (data structure) employed in the standard recording mode will be described with reference to FIG. As shown in the figure, the minimum unit of data recorded on the optical disc 200 is one EFM frame based on the EFM (8/14 modulation) modulation method of the CD standard. One frame of 588 bits is composed of 98 EFM frames. Further, one sub-coding frame (including track number, index information, absolute / relative address, etc.) composed of “P, Q, R,..., W” is generated by this one frame.

  Also, an absolute address associated with the wobbling information of the recording track is given from the recording track on the inner periphery of the optical disc 200 toward the recording track on the outer periphery. This absolute address corresponds to an ATIP address as absolute time information. The ATIP address is usually composed of 24 bits of data, the upper 8 bits indicating “minute”, the subsequent 8 bits indicating “second”, and the lower 8 bits indicating “frame”.

  The number of frames per second is “75”. Here, a recording area (hereinafter referred to as 1 ATIP section) set by an ATIP address corresponding to “1/75” seconds is one sector handled as a recording / reproducing unit in the optical disc apparatus 100. The recording area for one sector is normally composed of 2 k bytes, and a sync pattern, discriminator, wobbling information, CRC data, etc. are recorded as described above.

=== High-density recording mode ===
Next, a data format (data structure) employed in the case of the high density recording mode will be described with reference to FIG. In the high-density recording mode, the recording density is defined to realize, for example, a recording density that is 2.0 times that of the standard recording mode. For this reason, as a data format adopted in the case of the high-density recording mode, data of 2 sectors, that is, 4 kbytes is recorded in the above-described 1 ATIP section. As shown in the figure, ID information, recording data, and parity bits are recorded in the recording area for one sector.

  In addition, the data format of the high-density recording mode employs a modulation / demodulation method conforming to the DVD standard, so that recording / recording is performed in units of 1 ECC (Error Correction Code), which is a unit for performing error correction using Reed-Solomon codes. Playback is performed. One ECC block is defined as data of 16 sectors (32 kbytes), and is recorded in a recording area corresponding to, for example, 8 ATIP sections.

<Disk format>
=== Standard recording mode ===
First, the disc format of the optical disc (CD medium) 200 employed in the standard recording mode will be described with reference to FIG.
In the disc format 400 in the standard recording mode, a PCA (Power Calibration Area) 400a, a PMA (Program Memory Area) 400b, a lead-in area 400c, a pre-gap area 400d, from the inner circumference side to the outer circumference side of the optical disc 200, A data area 400e and a lead-out area 400f are provided.

The PCA 400a is a recording area reserved for setting an optimum recording power value of the laser element 1a according to the recording speed and the type of the optical disc 200 prior to actual recording. The PCA 400a is divided into a test area 400g where a test signal for adjusting the laser output emitted to the optical disc is recorded, and a count area 400h which is provided on the outer peripheral side of the test area and where the number of test signal recordings is recorded.
The PMA 400b stores management data PMD such as a start and end address of a recorded or reserved track and a recording type (Write Type). The management data PMD is recorded as subcode data in the subcoding frame.
The lead-in area 400c is an area for recording information of each session existing at the head of a session which is a data unit of the CD standard (standard recording mode). Further, a TOC (Table Of Contents) area is set in the lead-in area 400c, and when the optical disc 200 is terminated (session is closed), the management data PMD in the PMA 400b is recorded in the TOC area. The
The pre-gap area 400d is an area in which the interval (gap) between tracks is set, and the data area 400e is a user-usable area where data is actually recorded and reproduced. The lead-out area 400f is an area for indicating the end of each session.

=== High-density recording mode ===
Next, the disc format of the optical disc (CD medium) 200 employed in the case of the high density recording mode will be described with reference to FIG.
In the disc format 410 of the optical disc 200 in the high-density recording mode, the format area 410a, the PCA (“power calibration area”) 410b, and the PMA (“program memory area”) are arranged from the inner circumference side to the outer circumference side of the optical disc 200. ) 410c, a data area (“data area”) 410d, and a lead-out area 410e. Note that the arrangement order of the format area 410a and the PCA 410b may be reversed.

  Compared to the disc format 400 in the high-density recording mode, the format area 410a is set in the PCA 400a, the PCA 410b is set in the PMA 400b, and the PMA 410c is set in the lead-in area 400c. The data area 410d starts from the pre-gap area 400d and is set up to immediately before the lead-out area 410e.

The format area 410a is an area where predetermined data is recorded when the formatting process of the optical disc 200 is executed in the high-density recording mode. The predetermined data may be data irrelevant to the data recorded on the PCA 400a in the standard recording mode (for example, all “0”), or the manufacturer identification ID, the manufacturing model number, and the disk format in the high-density recording mode. Identification data for identifying the optical disc 200, such as a binarized code indicating the above, may be recorded.
The PMA 410c is also used as a TOC area. That is, the management data PMD is recorded in the PMA 410c as in the case of the standard recording mode, and the management data PMD is used as the TOC when the optical disc 200 is terminated (session is closed).

  With the above configuration, the high-density recording mode disk format 410 enables high-density recording by omitting the pre-gap area 400d, etc., as compared with the standard recording mode disk format 400.

<Relationship between ATIP address and PSN address>
=== ATIP address ===
The ATIP address will be described in detail.

  FIG. 5 shows ATIP address setting information obtained by the optical disc apparatus 100 decoding physical wobbling information of the pregroove of the optical disc 200. The ATIP address has one aspect as a physical address assigned to a recording track of the optical disc 200 and one aspect as a logical address used by the optical disc apparatus 100 to control recording or reproduction on the optical disc 200.

  The ATIP address corresponding to the innermost circumference side of the data area is “00 (minute): 00 (second): 00 (frame)”. In the recording area (hereinafter referred to as the outer peripheral recording area) from the innermost side to the outer peripheral side of the data area, “00 (minute)” in terms of “1 second = 75 frames”. "00 (second): 00 (frame)" is given an ATIP address that is simply increased in units of one frame.

  On the other hand, the recording area on the inner circumference side from “00 (minute): 00 (second): 00 (frame)” (hereinafter referred to as the inner circumference recording area) cannot be used by the user such as PCA or PMA. It is a reserved area. In this inner circumference recording area, similarly to the outer circumference recording area, an ATIP address is given in units of one frame in terms of “1 second = 75 frames”.

=== PSN address ===
The PSN address will be described in detail.
FIG. 5 shows PSN address setting information used as a logical address when the optical disc apparatus 100 performs recording or reproduction on the optical disc 200 in the high-density recording mode.

  Here, the PSN address indicates a high-density recording address (y) calculated by “y = n × (x−m) + m” when the absolute address as the ATIP address is “x”. . Here, “n” is a magnification for the recording density (a magnification in the standard recording mode is 1), and “n = 2.0” if the recording density is 2.0 times. “M” is a reference address.

  That is, the PSN address is a high-density recording in which a recording area (1 ATIP section) corresponding to a unit time (“1/75” seconds) based on the absolute address “x” is divided by a magnification (n) for recording density. According to the data format of the mode, it is given to the logical partition area of one ATIP section. By recording in the high-density recording mode using the PSN address, n times as much data is recorded in one ATIP section, and as a result, the recording density of the optical disc 200 becomes n times.

  In the present invention, the recording density magnification (n) is “2”, and the innermost PSN address (m) of the data area is “30000H (Hexadecimal: Hexadecimal)”. In this case, the PSN address (y) associated with the ATIP address in the outer recording area is calculated as “y = 2 × (x (hexadecimal) −30000H) + 30000H”. For example, the PSN address corresponding to the ATIP address of “00 (minute): 00 (second): 01 (frame)” is “30002H = 2 × (30001H−30000H) + 30000H”.

  Thus, the ATIP address and the PSN address are associated with each other, and the optical disc apparatus 100 can use the ATIP address in addition to the PSN address in the access control to the optical disc 200 in the high-density recording mode. .

<Specific PIT pattern>
Next, a specific PIT pattern (“binarized code”) according to the present invention will be described with reference to FIGS. 6 and 7. The specific PIT pattern is a binarized code for causing another optical disk device to determine that the optical disk 200 is recorded in the high-density recording mode. In the following description, when the optical disc 200 is a CD medium, the standard recording mode is recorded / reproduced with the data format of the CD standard, and the high density recording mode is recorded / reproduced with the data format of the DVD standard. .

FIG. 6 shows a detailed configuration of each area on the inner circumference side of the data area 400e (see FIG. 4) as a CD format disk format.
As shown in FIG. 6, a PCA 400a, a PMA 400b, and a lead-in area 400c are provided from the inner periphery side to the outer periphery side of the optical disc 200. As shown in the figure, the ATIP address on the innermost circumference side of the lead-in area 400c is set to 00:00:00, and the area on the inner circumference side of the lead-in area 400c is minus with respect to 00:00:00. The ATIP address is assigned.

The PCA 400a is divided into a test area 400g and a count area 400h. The test area 400g is 1500 frames from “−00: 35: 35” to “−00: 15: 35”, and the count area 400h is “−00: 15: 05” to “−00: 13 frames are 13:55 ″.
The PMA 400b actually records information (management data PMD) indicating the state of recording / reproducing on the optical disc 200 for 50 frames from “−00: 13: 25” to “−00: 12: 50”. The region 400i is set and provided on the outer peripheral side of the PCA 400a.

  Between the test area 400g, the count area 400h, and the recording area 400i, there is an unset area in the disc format of the CD standard (“unset area”). For the sake of convenience, these unset areas are area D (innermost to test area 400g), area C (test area 400g to count area 400h), area A (count area 400h to These will be referred to as recording area 400i) and area B (recording area 400i to lead-in area 400c).

  By the way, a general optical disk apparatus always accesses the count area 400h when a CD player is loaded with a disk. Therefore, in the present embodiment, the area A located in the vicinity of the count area 400h is employed as the recording area for the specific PIT pattern. Here, the area A is an area between the recording area 400i and the count area 400h, and is 30 frames from “−00: 13: 25” to “−00: 13: 55”. The optical disk apparatus 100 records a specific PIT pattern in the area A under the control of the system control microcomputer 15 when recording on the optical disk 200 in accordance with the data format of the DVD standard. The area for recording the specific PIT pattern may be an unset area that is not used in a CD format other than the area A in the CD format. For example, any one of area B, area C, and area D shown in the figure may be adopted as an area for recording a specific PIT pattern.

  As an example of the specific PIT pattern, as shown in FIG. 7, in the first 8 frames of 30 frames, frames 3 and 4 and frames 7 and 8 have PIT (logical value “1”), frames 1 and 2 and frames 5 and 6 are assumed to have no PIT (logical value “0”). Of course, it is not limited to the specific PIT pattern shown in FIG.

  Here, when another optical disk device such as a CD player starts playback of the optical disk 200, the count area 400h is first accessed to investigate the usage state of the test area 400g of the PCA 400a, and then a specific PIT pattern is accessed in the area A. It is determined whether or not is recorded. When the specific PIT pattern is recorded in the area A, it is determined that the optical disc 200 is recorded in the DVD standard data format. Since the specific PIT pattern is a simple binary data string of “0” or “1”, the specific PIT pattern can be detected even in an optical disc apparatus that does not include a DVD standard dedicated decoder.

<Operation in disc discrimination>
=== PIT pattern recording ===
FIG. 8 shows a flowchart for explaining the operation of the specific PIT pattern recording. Since the specific PIT pattern is recorded in the DVD standard data format, the specific PIT pattern is recorded by the optical disc apparatus 100 having the DVD standard encoder. First, it is determined whether or not the optical disc 200 is mounted on the optical disc apparatus 100 and is a recording CD (S800). If it is not a recording CD (S800: NO), the optical disc apparatus 100 determines that the optical disc 200 is a reproduction-only CD and does not record a specific PIT pattern (S801).

  When the optical disc apparatus 100 determines that the optical disc 200 is a recording CD (S800: YES), it determines whether or not the optical disc 200 is a blank disc (S802). When the optical disc apparatus 100 determines that the optical disc 200 is not a blank disc (S802: NO), the specific PIT pattern is not recorded (S803). This is because the DVD standard data format cannot be performed when the data is already recorded in the CD standard data format, and a new specific PIT pattern is newly recorded when the data is already recorded in the DVD standard data format. This is because there is no need for recording.

  If the optical disc apparatus 100 determines that the optical disc 200 is a blank disc (S802: YES), DVD format processing (S804) and OPC, which is test recording for recording power adjustment, are executed (S805). Then, immediately after the OPC process, the optical disc apparatus 100 records a specific PIT pattern that is a binarized data string in the area A of the optical disc 200 (S806).

=== PIT pattern detection ===
Next, FIG. 9 shows a flowchart for explaining the operation of reading the specific PIT pattern. The reading of the PIT pattern is performed by another optical disc apparatus that does not have a DVD standard dedicated decoder. First, the recorded optical disk 200 is mounted on an optical disk device (not shown) having a decoder dedicated to the CD standard, and is determined to be a CD medium such as a CD-R / RW (S900).

  The optical disk device (not shown) performs a servo adjustment for adjusting a servo mechanism (such as a tracking servo mechanism or a focus servo mechanism) incorporated in the optical head 1 (S901), and then uses the test area 400g of the PCA 400a. In step S902, the number of free areas in the PCA is checked.

  Next, the optical disc apparatus (not shown) detects a specific PIT pattern in the area A adjacent to the count area 400h (S903), and determines whether a specific PIT pattern is detected (S904). If the specific PIT pattern is not detected (S904: NO), the optical disc 200 is determined as a CD medium recorded in the data format of the CD standard (S906). When the specific PIT pattern is detected (S904: YES), the optical disc 200 is determined as a CD medium recorded in the data format of the DVD standard (S905).

  In the case of a CD medium recorded in the data format of the DVD standard, since the CD medium is a data format of the DVD standard, it cannot be decoded by a decoder dedicated to the CD standard. Even in an optical disc apparatus (not shown) provided with a dedicated decoder, it is possible to discriminate the optical disc 200 recorded by the data format of the DVD standard.

  For example, in an optical disc apparatus provided with a decoder dedicated to the CD standard, if the optical disc 200 is not in the CD standard data format, it cannot be displayed that it is an optical disc recorded in the DVD standard data format, but an error is displayed. Or forcibly eject it.

  Further, even if an optical disc apparatus is provided with a decoder dedicated to the CD standard, the user can recognize that the optical disc 200 is a data format formatted according to the DVD standard by providing a simple configuration in which the optical disc apparatus has a display function. Can be made.

  As described above, according to the optical disc apparatus and the optical disc discrimination method according to the present invention, the CD medium recorded in the high-density recording mode can be discriminated accurately by another optical disc apparatus including a standard recording mode decoder (CD dedicated decoder). Can do. In addition, when recording an optical disc in a high-density recording mode, a specific PIT pattern that can be discriminated by a standard recording mode decoder is recorded in an area that is not normally used in the standard recording format, and this specific PIT pattern is easily detected at the time of reading. The format can be determined. Therefore, it is possible to prevent the user from erasing the contents recorded on the CD medium by mistake.

In addition, since this area is not used for CD media logical erasure or mount rainier, the specific PIT pattern is not overwritten.
Further, since the specific PIT pattern is detected in the area A that is adjacent to the count area 400h that is always accessed when the optical disc 200 is read, the movement distance of the optical head 1 can be shortened, and the detection time can be shortened.

  As mentioned above, although embodiment of this invention was described concretely based on the embodiment, it is not limited to this and can be variously changed in the range which does not deviate from the summary.

1 is a schematic configuration diagram of a system including an optical disc device according to an embodiment of the present invention. It is a figure explaining the data format employ | adopted in the case of a standard recording mode. It is a figure explaining the data format employ | adopted in the case of a high-density recording mode. It is a figure explaining the disk format employ | adopted in the case of a standard recording mode and a high-density recording mode. It is a figure explaining the relationship between an ATIP address and a PSN address. It is a figure explaining the detailed structure of each area | region in the inner peripheral side of the data area in the disc format of CD specification. It is a figure explaining an example of PIT pattern recording. 6 is a flowchart illustrating a PIT pattern recording operation according to an embodiment of the present invention. 6 is a flowchart illustrating an operation of reading a PIT pattern according to an embodiment of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Optical head 1a Laser element 2 Front end processing part 3 Optical head servo circuit 4 RF signal binarization processing part 5 WBL detection part 6 ATIP decoder 6a CRC check circuit 7 PSN decoder 8 PLL circuit 9 Decoder for high density recording mode 10 Standard Recording mode decoder 11 High-density recording mode encoder 12 Standard recording mode encoder 13 Interface unit 14 RAM
DESCRIPTION OF SYMBOLS 15 System control microcomputer 15a Disc discrimination | determination processing part 16 Laser output control part 17 Laser drive circuit 18 Spindle motor 19 Motor drive circuit 20 Motor control circuit 100 Optical disc apparatus 200 Optical disc 400 Disc format (standard recording mode)
410 disc format (high density recording mode)
400a PCA area 400b PMA area 400c Lead-in area 400g Test area 400h Count area 400i Storage area

Claims (6)

In an optical disc apparatus that performs recording / reproduction in accordance with a second format having a higher recording density than the first format defined as a recording / reproduction standard for optical discs,
A binarization code indicating that the optical disk is recorded in conformity with the second format is set in advance;
When recording on the optical disc in accordance with the second format, the binarization code is applied to an unset area on the inner circumference side of the data area of the optical disk set based on the first format. Having control means for recording,
An optical disc apparatus characterized by the above. The optical disc based on the first format has an inner circumference side of the data area.
A power calibration area having a test area in which a test signal for adjusting the output of a laser emitted to the optical disc is recorded, and a count area in which the number of times the test signal is recorded is recorded on the outer peripheral side of the test area;
A program memory area provided on the outer periphery side of the power calibration area and storing information indicating a recording / reproducing state on the optical disc;
The unset area is
An area between the count area and the program memory area;
The optical disc apparatus according to claim 1. An optical disc identification method for an optical disc apparatus that performs recording / reproduction in accordance with a second format having a higher recording density than the first format defined as a recording / reproduction standard for an optical disc,
Preset a binarization code indicating that the optical disk is recorded in conformity with the second format;
When recording on the optical disc in accordance with the second format, the binarization code is applied to an unset area on the inner circumference side of the data area of the optical disk set based on the first format. Recording,
An optical disc discrimination method characterized by the above. A method for discriminating the optical disc recorded in accordance with a second format having a higher recording density than the first format defined as a recording / reproducing standard for an optical disc,
The first optical disc apparatus that performs recording / reproduction according to the second format is:
Preset a binarization code indicating that the optical disk is recorded in conformity with the second format;
When recording the optical disc in accordance with the second format, the binarization code is added to an unset area located on the inner circumference side of the data area of the optical disc set based on the first format. Record,
The second optical disk device that performs reproduction in accordance with the first format is:
When discriminating the optical disc recorded in accordance with the second format, it is determined whether or not the binarization code is recorded in the unset area of the optical disc,
Determining that the optical disc is not recorded in conformity with the first format when the binarized code is recorded;
An optical disc discrimination method characterized by the above.   5. The optical disc discrimination method according to claim 4, wherein the state that is not recorded according to the first format is a state that is recorded according to the second format. The optical disc based on the first format has an inner circumference side of the data area.
A power calibration area having a test area in which a test signal for adjusting the output of a laser emitted to the optical disc is recorded, and a count area in which the number of times the test signal is recorded is recorded on the outer peripheral side of the test area;
A program memory area provided on the outer periphery side of the power calibration area and storing information indicating a recording / reproducing state on the optical disc;
The second optical disc apparatus is
When starting playback of the optical disc recorded in accordance with the second format,
After accessing the count area of the optical disc,
Determining whether the binarized code is recorded in the unset area of the optical disc;
The optical disc discrimination method according to claim 4 or 5, wherein:

Images