JP2002050040A - Optical disk device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical disk device capable of accurately discriminating the kind of the optical disk with the simple constitution while not depending on the kind. SOLUTION: By this device, Disk Category and Version Number are extracted, which are the disk kind information recorded on a control data zone of the optical disk, and since the discrimination is performed on the basis of the extracted Disk Category and Version Number whether the class of optical disk is e.g. DVD+RW, DVD-ROM single layer, DVD-ROM double layer, DVD-R, or unknown format, the kind of the optical disk is accurately discriminated with the simple constitution while not depending on the kind of the optical disk.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disk apparatus that performs a reproducing or recording operation for optical disks of different types.

[0002]

2. Description of the Related Art An optical disk called a DVD (Digital Versatile Disc) has been developed and used as an optical disk recording medium suitable for multimedia applications. This DVD can be used in a wide range of fields such as video data, audio data, and computer data. Although a DVD is a disk (diameter 12 cm) of the same size as a CD, the recording capacity has been significantly increased due to a reduction in the pitch of recording tracks and a data compression technique.

In the field of such optical discs, CDs, CD-Rs, CD-RWs, DVD-ROMs,
VD-R, DVD-RAM, DVD-RW, DVD + R
Various systems such as W have emerged, and so-called compatible functions that follow these various systems are desired in optical disk devices.

[0004]

In order to realize such a compatible function, it is necessary to determine the type of the disk loaded with the optical disk device. For this reason,
For example, as described in Japanese Patent Application Laid-Open No. 9-198779, it is conceivable to provide a wobble detection circuit. However, in addition to the disadvantage of increasing the number of parts, the wobble detection circuit uses a CD / DVD-ROM and a CD-R. / DV
There is a problem that it can be used only for discrimination of DR.

In Japanese Patent Application Laid-Open No. 10-188458, the type of a disc is determined from a signal at a physical level obtained from the disc.
It can be used only for discrimination of DR / DVD-R,
In addition, variations in the sensitivity of the two-axis device, the effects of non-linearity due to axial friction seen in the two-axis sliding type, scratches on the disk surface,
There is a problem that accurate determination cannot be made due to the influence of de facto such as dirt, the influence of the temperature characteristic of the optical pickup, and the like.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problem, and has as its object to provide an optical disk apparatus that can accurately determine the type of an optical disk regardless of the type with a simple configuration. .

[0007]

In order to solve the above-mentioned problems, an optical disk device according to the present invention is provided in an optical disk device for recording / reproducing an optical disk having an area including disc type information. Means for extracting disc type information included in the area, and means for judging the type of the optical disc based on the extracted disc type information.

In the present invention, the disc type information recorded in a predetermined area of the optical disc is extracted, and the type of the optical disc is determined based on the extracted disc type information. The type can be determined accurately regardless of the type.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of the present invention will be described with reference to an optical disk device corresponding to a CD and a DVD as an example.

FIG. 1 is a block diagram showing the configuration of an optical disk device according to one embodiment of the present invention.

As shown in FIG. 1, a mechanism system 100 of the optical disk apparatus has an optical pickup unit 1, a sled motor and a sled position sensor, and a sled 2 which is a feed mechanism of the optical pickup unit 1, and a spindle motor. A loading mechanism 4 comprising a loading mechanism, a position sensor of the loading mechanism, an eject switch, and an LED indicator, and also serving as a loading mechanism for a disc tray (not shown) and an LED display. And The optical pickup unit 1 includes an objective lens 1a for CD, an objective lens 1b for DVD, and a wavelength of 7 for CD.
It has a laser diode 1c of 80 nm, a laser diode 1d having a wavelength of 650 nm for DVD and a driver 1e thereof.

The control system 200 of the optical disk device includes an RF amplifier and a servo amplifier, and a read processor 5 capable of selecting a DPP system or a DPD system for detecting a DVD tracking error, and a DVD writing clock synchronization circuit. , A clock processor and a write laser control circuit, and a write processor 6 capable of setting an optimum write condition (OPC).

The control system 200 includes a driver unit 7 composed of a driver IC for driving each motor of the drive system, a signal extraction PLL, an EFM demodulation circuit, and an 8/16 demodulation circuit. It comprises a channel processor 8 capable of outputting and a data processor 9 for performing DVD signal processing and CD signal processing. The data processor 9 includes an RS-PC encoder / decoder for DVD signal processing, ID processing for address detection,
The modulation circuit includes a wobble decoder for detecting a target address on a recordable medium, a CDRC signal processor, and a sub-code decoder for address detection.

Further, the control system 200 is provided with an adjustment function required for servo such as focus bias adjustment, and performs a servo signal processor 10 for performing signal processing for servo control, and measures a temperature near the optical pickup unit 1. Temperature sensor 11 and drive system control CP
U12, a non-volatile memory 13, data for host transfer, D-RAM 14 used for CD-ROM decoding in the case of a CD, and buffer management for improving host transfer efficiency. , For CD, CD-ROM
A buffer manager 15 as a host interface composed of a decoding circuit and a D for audio
And an audio DAC 16 which is an A converter.

Next, the operation of the optical disk apparatus configured as described above will be described.

When a medium is inserted into the optical disk device, a signal on the medium is read by the read processor 5 via the optical pickup unit 1. here,. Although the focus error signal changes depending on the use of the reflectance of the medium, the difference in the reflectance is absorbed by inserting an AGC circuit. Also, by selecting the DPD method as the tracking servo method, the Push-P
Since it is not affected by the change of the ull signal, it is possible to stably apply the tracking servo even when the media format is unknown.

When the control CPU 12 detects that a medium has been inserted into the optical disk device,
As shown in (2), detection of a media format is started (step 201).

First, the mask is set to 0, and the track pitch of the medium is detected.
It is determined whether the medium is a system medium (steps 202 to 2).
06). For example, since the track pitch is 1.5 μm to 1.7 μm for CD media and 0.74 μm or 0.80 μm for DVD media, this difference is detected. More specifically, as shown in FIG. 3, the track pitch of the medium is detected (step 3).
01), the thread 2 is moved to the innermost peripheral portion of the disk (step 302), and the thread 3 is started to move in the outer peripheral direction of the disk (step 304). After switching to the tracking error generation circuit that matches the return light detection method of the applied laser, the 780 nm laser diode 1c is turned on (step 305).

Then, the focus search is started (step 306). If the focus search cannot be performed (step 307) and a timeout occurs (step 30).
8) It is detected that the medium is a DVD medium (step 309). On the other hand, if the focus search is successful, the amplitude of the tracking error signal is measured, and if an amplitude greater than a predetermined threshold level THL is measured (steps 310 to 312), the CD is detected.
Detects that it is a system media. If an amplitude equal to or less than THL is measured, the medium is detected as a DVD medium. (Step 313).

Next, the address of the medium is read (step 207). If the address has been successfully read (step 208), the medium discrimination process ends. On the other hand, if the address cannot be read, the type of the mask is changed and the determination of the medium is executed again (step 209).
To 211).

Next, if it is determined that the medium is a DVD medium, the process proceeds to the next step for determining the type of the DVD medium.

The sled 2 is moved so that the DVD objective lens 1b can be focused at the position of the lead-in area of the disk. Usually, the lead-in area is located at the innermost peripheral portion of the disc.

Here, as shown in FIG. 4, Physical SectorNumber = 2F2 of each medium
In 00h to 2FE00h, there is a control data zone (Control Date Zone).
As shown in the figure, the control data zone (Contr
ol Date Zone) contains physical format information (Physical formata).
t information), disc manufacturing information (Diskmanuf)
Acting information and content provider information (Conten)
t provider information, and as shown in FIG. 6, physical format information (Physical format in).
format) includes a disk category and a version number (Disk Category and version number).
Version Number) and disc structure (Di)
sk structure: the number of recording layers).

In this embodiment, focus servo and tracking servo are applied, and the physical
Sector Number = 2F200h is sought and data is read from that position.

At the time of seeking, the identification data (Identify) of each frame shown in FIG.
application data (ID) and its ID
Of the sector information (Sec) shown in FIG.
After confirming the layer number shown in FIG. 10 of “Tor Information” and detecting that it is Layer 1, a focus jump operation to Layer 0 is performed, and a seek operation in Layer 0 is realized.

Now, as described above, Physical
Data format of Sector Number = 2F200h includes physical format information (Physical format information).
Byte 0 is recorded in the disc category and the version number (Disk).
Category and Version Num
ber) is recorded, and bit 4 of Byte 2 is recorded.
Indicates the number of recording layers.

In this embodiment, the format (type) of the currently read DVD medium is determined from these information, and the DVD + RW, DVD-ROM single layer, DVD-ROM double layer, DVD-R, and unknown format are determined. Classify into.

More specifically, as shown in FIG. 7, when it is detected that the medium is a DVD medium (step 701), for example, the servo conditions are set so that data can be read from the recording area of the DVD-ROM single layer. (Steps 702 to 705).

Then, the disc category and version number (Disk Category and V)
When the Disk Category indicated by the upper 4 bits of the “Version Number” is 1010b, the disc is determined to be DVD + RW, and the DVD + RW is determined from the vendor ID.
Is determined (steps 707 to 711).

Disk category and version number (Disk Category Version Verio)
n Number) Disk Category is 0
If it is 000b, it is determined that the disc is a DVD-ROM (step 712), and it is determined whether the recording layer is a single layer or a double layer (steps 713 to 715).

Disk category and version number (Disk Category Version Verio)
n Number) Disk Category is 0
If it is 010b (step 716), it is determined to be a DVD-R (step 717), and if it does not correspond to any of these book types, it is determined to be an unknown format (step 718).

In this embodiment, focus, tracking error servo and spindle servo conditions suitable for the determined format are set, and filters for each RF signal are set to appropriate ones. For example, when it is determined to be DVD + RW, the laser power is set to 1 mW, the tracking error servo is set to the DPP method, and the DVD-RO is set.
If it is determined to be M, the laser power is set to 2 mW,
The tracking error servo is set to the DPD method, and the DVD-
If it is determined to be R, the laser power is set to 1 mW,
The tracking error servo is a DPD method.

If necessary, the user can visually transmit information to the user by, for example, setting the LED on the front panel to green if the format is compatible with the drive, or setting the LED on the front panel to amber if the format is not compatible with the drive. Do.

Further, the command system of the buffer manager 15, which is an interface means for transferring data to and from an external device using a predetermined command system, is changed according to the type of the optical disc determined as described above. You may make it select a thing.

As described above, according to this embodiment, the Disk Category which is the disc type information recorded in the control data zone of the optical disc.
Is extracted, and the type of optical disc, for example, DVD + RW, DVD, is determined based on the extracted Disk Category.
-Since the discrimination is made between a ROM single layer, a DVD-ROM double layer, a DVD-R, and an unknown format, the type of the optical disc can be accurately determined irrespective of the type with a simple configuration.

As described above, in the case of DVD + RW, the vendor ID indicating the media manufacturer is read, but the data recording condition may be changed according to the vendor ID.

[0037]

As described above, in the optical disk apparatus according to the present invention, the type of the optical disk can be accurately determined irrespective of the type with a simple configuration.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration of an optical disc device according to an embodiment of the present invention.

FIG. 2 is an operation flow for discriminating between a CD and a DVD (part 1)
It is.

FIG. 3 is an operation flow for discriminating between a CD and a DVD (part 2)
It is.

FIG. 4 is a diagram showing a structure of a lead-in area of various DVDs.

FIG. 5 is a diagram showing a structure of a control data zone shown in FIG. 4;

FIG. 6 is a diagram showing the structure of physical format information shown in FIG.

FIG. 7 is an operation flow of discriminating a DVD type.

FIG. 8 is a diagram showing a structure of a data frame of a DVD.

FIG. 9 is a diagram showing a structure of an ID shown in FIG. 8;

FIG. 10 is a diagram showing a structure of sector information shown in FIG. 9;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Optical pick-up unit 2 Thread 3 Spindle mechanism 4 Loading part 5 Read processor 6 Write processor 7 Driver part 8 Channel processor 9 Data processor 10 Servo signal processor 11 Temperature sensor 12 Control CPU 13 Non-volatile memory 14 D-RAM 15 Buffer manager 16 DAC

Claims (9)

[Claims] 1. An optical disc apparatus for recording / reproducing an optical disc having an area including disc type information, comprising: means for extracting disc type information included in the area according to predetermined reproduction conditions; Means for discriminating the type of the optical disc based on information. 2. The optical disc has first and second layers each divided into a plurality of sectors, and an area including the disc type information is arranged in a specific sector of the first layer. A sector corresponding to a specific sector of the first layer and a sector corresponding to the specific sector of the first layer of the second layer each include layer information indicating the layer. Means for extracting layer information; means for determining whether the currently reproduced layer is the first layer or the second layer based on the extracted layer information; When it is determined that the
2. The optical disk apparatus according to claim 1, further comprising: means for setting reproduction conditions so as to reproduce the layer and extract the disc type information. 3. Recording on a first optical disc having a first track pitch and an area including the disc type information and on a second optical disc having a second track pitch wider than the first track pitch. 3. The apparatus according to claim 2, further comprising: a unit that can perform reproduction, and determines the optical disk as the first optical disk when the layer information can be extracted under predetermined reproduction conditions. 4. Optical disk device. 4. The optical disk apparatus according to claim 1, further comprising a setting unit that sets conditions for recording / reproducing the optical disk in accordance with the determined type of the optical disk. 5. The apparatus according to claim 1, further comprising a laser diode for performing recording on the optical disk, wherein the setting unit sets an output power of the laser diode according to the determined type of the optical disk. Item 5. An optical disk device according to item 4. 6. A method according to claim 1, wherein a plurality of types of tracking servo systems can be selected, and wherein said setting means selects a predetermined tracking error servo system according to the type of said discriminated optical disc. Item 5. An optical disk device according to item 4. 7. Recording on a first optical disc having a first track pitch and an area including the disc type information and a second optical disc having a second track pitch wider than the first track pitch. Means for determining whether the optical disk is the first optical disk or the second optical disk, and means for determining the type of the optical disk when the optical disk is determined to be the first optical disk; The optical disk device according to claim 1, further comprising: 8. The optical disk device according to claim 1, further comprising means for outputting data relating to the determined optical disk type to an external device. 9. An interface means for transferring data read from the optical disc or data to be written to the optical disc to / from an external device using a predetermined command system, and 2. The optical disk apparatus according to claim 1, further comprising: means for selecting a command system used by said interface means.