JPH07220284A - Disk and disk reproducing device - Google Patents

Abstract

PURPOSE:To obtain a first disk provided with a signal recording region exchangeable for a second disk in the read-in area of the first disk and recorded with such a signal as to distinguish the first disk from the second disk. CONSTITUTION:A signal recording a format in a reading-in area 3 exchangeable of a first disk 1 records the signal with a format having a compatibility with signal recording format of CD. For example, '11XX', being not yet specified, for discriminating the disk from CD is recorded as a CONTROL signal for sub-coding in the region.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disc and a reproducing apparatus thereof, and more particularly to a disc and a reproducing apparatus thereof having different recording specifications in a lead-in area and a program area.

[0002]

2. Description of the Related Art Optical discs for reading out information signals recorded on a disc using a laser beam are easily manufactured, and are widely used because of their large capacity and good access. This optical disc is a CD, a CD-ROM,
There are various types such as CDV, CD-I, and LD,
The recording densities of these optical disks are almost equal, and the track pitch is about 1.6 μm.

Here, these optical disks (especially CDs)
Will be described. FIG. 3 is a diagram showing a signal recording area of a CD and an array of signals recorded on a disc. In the figure, the pit depth of the disk 21 is 110 nm, the pit width is 0.5 to 0.8 μm, and the track pitch is 1.6.
It is specified as ± 0.1 μm. In the signal recording area 22 of the disc 21, the time and the number of frames of each song recorded on the disc called TOC, the number of the first song and the number of the last song, the time and the number of frames at which the last song ends, etc. Of the disc, the lead-in area 23 at the innermost circumference of the disc, a program area 24 in which main information such as a music program is recorded, and a lead-out area 25 in which information indicating that the main information has ended is recorded. Etc. are provided.

In the reproducing apparatus for reproducing the disc 21, usually, the information recorded in the lead-in area 23 is first read and the information in the program area 24 is reproduced.

Next, the signal format will be described. FIG. 4 is a diagram showing the structure of a sub-coding frame format of CD. In FIGS. 3 and 4, 1
The frame is composed of a synchronization signal, control data, audio data, and parity data. The control data is called sub-coding, and has an 8-bit area for each frame, and its content is configured to be completed in 98 frames. Each bit of subcoding is P,
Corresponding to eight channels Q to W, each channel is composed of 98 bits.

First 2 of each sub-coding channel
Bits are 8 channels and sub-coding synchronization signal (S
0, S1). The P channel is a flag bit for discriminating between the tune and the middle of the tune, the tune number and time information are recorded in the Q channel, and the R to W channels are undetermined areas.

FIG. 5 is a diagram showing the structure of the Q channel of the CD. In the figure, in the Q channel, the first 2 bits (S0, S1) are a synchronization pattern, and the next 4 bits CONTROL are recorded with control signals such as the number of transmission channels, presence / absence of pre-emphasis, and signal type. ,
The next 4-bit ADR is the data-Q 72 of the next data.
It defines the bit recording method. For example, the song number and the elapsed time of the song are recorded in the DATA-Q area in ADR mode 1. CRCC is a 16-bit error detection signal.

Recently, research and development of an optical disk (hereinafter referred to as a first disk) in which signals are recorded at a higher density than that of such an existing optical disk (hereinafter referred to as a second disk) has been conducted.

[0009]

By the way, the first disc is mistakenly attached to the second disc reproducing apparatus for reproducing the second disc because of the appearance similar to the second disc. It is conceivable that the reproduction operation of the first disc is performed by the second disc reproduction device. However, the first disc differs from the second disc in track pitch, recording density, etc., and the second disc reproducing device cannot accurately read a signal, and thus reproduces an abnormal signal or disc. There are problems that the number of rotations becomes abnormally high and the operation of the optical head becomes abnormal.

Particularly in the case of a high density optical disk having a normal light reflectance, the number of rotations of the disk is abnormally increased when trying to read the information signal. So the user
When the lid is lifted to stop the abnormal operation, the rotated disk jumps out of the device, which is dangerous, and there is a problem that the disk is scratched.

As a method for distinguishing the first disk from the second disk, for example, optical or magnetic identification information (by a bar code or the like) is recorded on the label surface of the disk, and the second disk reproducing apparatus is used. It is also conceivable that the second disc reproducing device is configured to perform the reproducing operation only after reading the identification information. However, the structure of the device becomes complicated and expensive. Further, there is no effect in the existing second disc reproducing apparatus. Therefore, even if the first disc is accidentally loaded into the existing second disc playback device, the playback device may determine that the playback of this disc is impossible and stop playback. is necessary.

Therefore, the present invention has been made by paying attention to the above points, and a signal recording area having a recording specification compatible with that of the second disk is provided in the lead-in area of the first disk. It is an object of the present invention to provide a first disc on which a signal which is distinguished from the second disc is recorded. It is another object of the present invention to provide a disc reproducing device capable of reproducing both the first disc and the second disc.

[0013]

According to the present invention, as means for achieving the above object, the recording specification of the program area of the first disc is different from that of the second disc. A part of the lead-in area of one disc, or the recording specification of the entire lead-in area is a recording specification compatible with the recording specification of the lead-in area of the second disc, and the second disc is set in the area. It is intended to provide a first disc characterized by recording identifiable information.

The pit depth of the first disk is about 60 to 90 nm, the width of pits in a part of the lead-in area or the entire lead-in area is about 0.5 to 0.8 μm, and the track pitch is about. Provided is a first disk characterized by being formed with 1.6 ± 0.1 μm, a pit width of a program area of about 0.3 to 0.5 μm, and a track pitch of about 1.0 to 0.6 μm. It is what

Further, there is provided a disc reproducing apparatus adapted to reproduce both the first disc and the second disc, the first disc being adapted to the recording specifications of the program area of the first disc. A signal processing unit, a second signal processing unit that conforms to the recording specifications of the second disc, and a reproduction control unit that controls switching between the first signal processing unit and the second signal processing unit. In the initial state, the signal processing section is set to the second signal processing section, and the second signal processing section and the reproduction control section record the second signal recorded in the lead-in area of the first disc. An object of the present invention is to provide a disc reproducing device characterized by reading a disc identification signal and switching the signal processing unit to the first signal processing unit.

[0016]

Next, an embodiment of the present invention will be described.
FIG. 1 is a diagram showing a signal recording area of an optical disc which is an embodiment of a disc of the present invention and an array of signals recorded on the disc. In the same figure, a disc 1 (first disc) is provided with a signal recording area 2, a lead-in area 3, a program area 4 and a lead-out area 5, and the program area 3 records more information. It has been densified by various methods so that the audio recording, the disc specification, the signal recording format such as the recording density or the signal format is different from that of the second disc. Normal reproduction by the second disk reproducing device for reproduction is impossible.

On the other hand, in the lead-in area 3, from the innermost circumference of the disc to a certain part in the lead-in area, or in the entire lead-in area, a signal recording format such as audio specifications, disc specifications, recording density and signal format. However, an area is provided that is compatible with that of the second disc. Then, in that area, for example, information indicating that the disc 1 cannot be reproduced by the second disc reproducing apparatus is recorded.

Therefore, when an attempt is made to reproduce the disc 1 in the second disc reproducing device, the second disc reproducing device is compatible with the signal recording format of the second disc in the lead-in area 3 described above. The information recorded in the area of the signal recording format is read, it is determined that the information cannot be reproduced by the device, and the operation is stopped.
That is, the abnormal operation as described above is not performed.

Next, a detailed description will be given. This disc 1
Has a pit depth of 60 to 90 nm, a pit width of the lead-in area 3 is 0.5 to 0.8 μm, a track pitch is 1.6 ± 0.1 μm, and a pit width of the program area 4 is With a track pitch of 0.3 to 0.5 μm and a track pitch of 1.0 to 0.6 μm, high density recording in the program area 4 is realized.

That is, the pit width and track pitch of the lead-in area 3 are the same as those of the CD (second disc) as described above. The pit depth is 110 nm for a CD, but is different from 60 to 90 nm, but it is a range that can be read by a laser beam of a CD reproducing device. Therefore, the reproduction of the lead-in area 3 is also possible in the CD reproducing apparatus. Further, if the pit shape is further optimized, it can be read more accurately by a CD reproducing apparatus.

By the way, in the above-mentioned CD signal format, there is a region which is not yet determined. Therefore, the signal format of the lead-in area 3 of the disk 1 is C
If an identification signal is recorded in the undetermined area in the same manner as in D, the identification signal cannot be identified in the CD reproducing device and reproduction is not performed. In FIG. 1, the signal format of the lead-in area 3 of the disc 1 is the same as the format of the CD as described above, one frame consists of a synchronization signal, control data and data parity, and the sub-coding frame format which is the control data is also the CD. The format is the same. Here, for example, the CONTROL signal of sub-coding is set to "11XX" or "01X1" (X is 0
Or any one of 1) is recorded, the CD reproducing apparatus cannot identify this signal and is not reproduced.

In addition, in the above-mentioned 4-bit ADR, mode 1, mode 2 and mode 3 are currently defined, but since they are represented by 4 bits, 13 other types of patterns are not defined. Become. Therefore, if any identification signal is recorded here, it will not be reproduced by the CD reproducing apparatus.

In this case, TOC data of this disc is recorded in DATA-Q. For example, in a first disc reproducing apparatus which will be described later, the above-mentioned identification signal is read to identify that this disc is the first disc, and TOC data is read to reproduce the program area 4. .

The TOC data recorded on DATA-Q is recorded on the other disc as a first disc in which a signal which cannot be reproduced by a CD reproducing device is recorded.
For example, the number of songs is 0, the total time is 0, etc., and TOC data is recorded on the disc as if no main information such as a music program is recorded. Can be non-reproducible.

In this case, at least a part of the innermost circumference of the lead-in area is used as the first lead-in area compatible with the CD format, and the TOC as described above is used.
Record data, and then provide a second lead-in area,
The original TOC data of this disc may be recorded there. The signal recording format of the second lead-in area may be either a signal recording format compatible with the CD format or a signal recording format of the program area of the first disc.

According to this structure, the CD reproducing apparatus reads the TOC data recorded in the first lead-in area, determines that the program information is not recorded on this disc, and stops. On the other hand, for example, in a first disc reproducing apparatus as will be described later, the TOC data recorded in the first lead-in area is read, it is determined that this disc is the first disc, and then the second disc is read. Play the in area. The original TOC data recorded there is read, and the program area is reproduced.

Next, a disc reproducing apparatus capable of reproducing both the first disc and the second disc and its reproducing operation will be described. FIG. 2 is a partial block diagram showing a configuration of an example of an optical disc reproducing apparatus which is an embodiment of the disc reproducing apparatus of the present invention capable of reproducing both the disc and the CD shown in FIG. In the figure, first, the signal recorded in the lead-in area of the disk 7 is picked up from the optical pickup 6. The device is a CD in the initial state
Is set so that the reproduction control unit 9 controls the servo unit 10, the switching unit 11 and the signal decoding unit 12 based on the data in the lead-in area that has been signal-processed by the CD signal processing unit 8. Then, the program area is reproduced.

For example, when reproducing a CD, the CD signal processing unit 8 and the reproduction control unit 9 identify that the disc is a CD and read TOC data, and the CD signal processing unit 8 and the signal decoding unit are read. 12, the program area is reproduced. When reproducing the first disc 1, the CD signal processing unit 8 and the reproduction control unit 9 identify this disc as the first disc 1 and read the TOC data. Switching to the first disk signal processing unit 13 and reproduction of the program area is performed.

Further, as described above, the first lead-in area and the second lead-in area are provided, the disc identification information of the disc is provided in the first lead-in area, and the disc identification information of the disc is provided in the second lead-in area. In reproducing the first disc on which TOC data is recorded, the reproducing device first reproduces the first lead-in area, and when it is identified as the first disc, reproduces the second lead-in area. It may be configured to do so.

When the signal recorded in the program area has a signal format such as a modulation method or a decoding method different from that of the lead-in area, the first disc is reproduced by the reproduction controller 9. The servo unit 10 and the signal decoding unit 12 may be switched to an optimum circuit configuration.

As described above, this optical disk reproducing apparatus can reproduce both the first disk and the CD.

[0032]

As described above, according to the first disk of the present invention, the lead-in area of the second disk is formed from the innermost circumference of the lead-in area to a part thereof or the entire lead-in area. Since there is an area compatible with the recording specifications of the disc and the information discriminable from the second disc is recorded in the region, the information of the region can be read by the second disc reproducing device. Since it is identified that the disc is not the second disc, the reproducing operation is not performed and the abnormal operation as described above is not performed.

In particular, when the second disc is an existing disc whose standard has already been defined, and the first disc is a disc which has a different standard to that and has realized higher density recording, the existing disc is Even in the existing disc reproducing apparatus that only conforms to the standard, the disc is not identified and an abnormal reproducing operation is not performed even if the first disc is mistakenly mounted without adding any configuration.

According to the disc reproducing apparatus of the present invention,
Both the first disc and the second disc can be reproduced with a simple structure.

[Brief description of drawings]

FIG. 1 is a diagram showing a signal recording area of an optical disc that is an embodiment of a disc of the present invention and an array of signals recorded on the disc.

FIG. 2 is a partial block diagram showing a configuration of an example of an optical disc reproducing apparatus which is an embodiment of the disc reproducing apparatus of the present invention capable of reproducing both the disc and the CD of FIG.

FIG. 3 is a diagram showing a signal recording area of a CD and an array of signals recorded on a disc.

FIG. 4 is a diagram showing a structure of a sub-coding frame format of CD.

FIG. 5 is a diagram showing a structure of a Q channel of a CD.

[Explanation of symbols]

 1 disk (first disk) 3 lead-in area 4 program area 8 CD signal processing section (second signal processing section) 9 reproduction control section 10 servo section 11 signal switching section 12 signal decoding section 13 first disk signal processing Part (first signal processing part) 21 CD (second disc)

Claims (3)

[Claims] 1. A recording specification of a program area of a first disc is different from that of a second disc, and a part of the lead-in area of the first disc or the entire recording area of the lead-in area is recorded. The first disc characterized in that the specification is a recording specification compatible with the recording specification of the lead-in area of the second disc, and the discriminating information from the second disc is recorded in the area. Is a disc. 2. The pit depth of the first disc is about 60.
˜90 nm, a part of the lead-in area, or the pit width of the lead-in area is about 0.5 to 0.8 μm, the track pitch is about 1.6 ± 0.1 μm, and the pit width of the program area is about 0. .3 to 0.5 μm,
2. The disk according to claim 1, wherein the disk has a track pitch of about 1.0 to 0.6 [mu] m. 3. A disc reproducing apparatus adapted to reproduce either the first disc or the second disc according to claim 1, which complies with the recording specifications of the program area of the first disc. A first signal processing unit, a second signal processing unit that conforms to the recording specifications of the second disc, and a reproduction control unit that controls switching between the first signal processing unit and the second signal processing unit. In the initial state, the signal processing unit is set to the second signal processing unit, and by the second signal processing unit and the reproduction control unit,
A disc reproducing apparatus, wherein an identification signal for identifying the second disc recorded in a lead-in area of the first disc is read and a signal processing unit is switched to the first signal processing unit.