JP3466564B2 - optical disk - Google Patents

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to an optical disc.

[0002]

2. Description of the Related Art Write-once type optical disks have been developed which can record data only once. In this write-once optical disc, the organic dye applied to the pre-groove in which the wobbling signal and the position information for keeping the linear velocity at the time of recording just before the reflection layer are formed is irradiated with laser light. Information is recorded by making an optical change.

A conventional apparatus for recording data on such a write-once type optical disc has been designed to perform recording according to the format shown in FIG. That is, FIG.
(A) shows a recording format of a write-once optical disc (CD-R), where PCA is an area for checking write power, RI is a lead-in area, DATA is a write data area, and RO is a lead-out area. .

Writing data to a conventional CD-R is shown in FIG.
As shown in (A), the RI data and RO data are added before and after the additional write data for each additional write data, and the CD-R is added.
I am trying to write to. Further, as shown in FIG. 5B, the format of each data to be written in the CD-R is such that a sync signal (SYNC) and a sync signal number (S #) are added for each fixed length of write data. I try to put it in.

[0005]

As described above, in the conventional writing of data to a CD-R, a large amount of lead-in data and lead-out data is added to each additional write data.

Therefore, the lead-in and lead-out areas increase in accordance with the number of times of additional recording on the CD-R, and the recording area for recording necessary data decreases accordingly. Also, when reproducing the data recorded in this way, it is not possible to determine the last lead-out because it is not known how much writing is done, and the last lead-out area is passed. The reading is performed, and the determination is made by knowing that the writing is not performed (not formatted) there.

Therefore, if the formatting is not performed, the synchronization signal used for the spindle servo control cannot be obtained, the synchronization is lost, and the information must be reproduced again by the complicated processing. According to the present invention, the data recording area does not decrease much even if the number of additional recordings increases,
Moreover, it is an object of the present invention to provide an optical disc whose recording end position can be easily determined.

[0008]

Before describing the means for solving the above-mentioned problems, the recording principle for obtaining the optical disk of the present invention will be described with reference to FIG. FIG. 4A shows the recording format of the CD-R used in the present invention.
(B) is a write data format. The write data format shown in FIG. 4B uses the same format as described in FIG. 5B.

In FIG. 4A, the write power check area (PCA), the lead-in area (RI), the data (DATA) and the lead-out area (RO) are the same as those described with reference to FIG. 5A. is there. According to the present invention, a management information area (MA) for recording a directory of data to be recorded before writing data, a partition address indicating a recording end position, and the like, and a partition area (PA) indicating a recording end position next to the recording data are provided. Set up. Since the amount of data in MA and PA is much smaller than that in RI and RO, the reduction of the data area due to the addition of MA and PA is very small.

As the data to be written in the PA, a predetermined binary data (P) is written. As shown in FIG. 5 (A),
When performing the second additional recording (Chapter 2 ) on the CD-R on which the first writing (Chapter 1) has been performed, first the MA is read to know the PA position, and the partition data (P) is recorded at the PA position. If (P) is recorded, it is necessary to rewrite data (E) other than (P) and then write MA, DATA and PA shown in Chapter 2. To Therefore, when a plurality of additional recordings are performed, only the last added PA of the chapter is recorded with the partition data (P) indicating the ending position, and the previous PA of the chapter is rewritten with (E). The writing end position can be easily known by changing to data other than (P). In addition, when the additional recording to the CD-R is finished, as shown in FIG.
Write O.

Next, means for solving the problem will be described. The present invention according to claim 1 is directed from the inner peripheral side to the outer peripheral side.
An optical disc in which a plurality of chapters are recorded, and the chapters are the objects on the optical disc.
Together are formed by physically contiguous, comprises a write data area recording data is recorded, is physically located after said write data area, the partition data indicating whether or not the recording end position And a partition area.

According to a second aspect of the present invention, in the optical disc according to the first aspect, when the partition data is in a non-written state, it indicates a recording end position.

The present invention according to claim 3 provides the invention according to claim 1 or 2.
In the optical disc described in the above, the chapter further includes a management information area in which an address of a partition area in the chapter is recorded before the write data area. Claim 4
The present invention as set forth in claim 1 is the light according to any one of claims 1 to 3.
In the disc, the optical disc is the plurality of discs.
The lead-in area is provided on the inner peripheral side of the
The amount of data in the management information area is
It is characterized in that it is smaller than the data amount in the area. Claim
The present invention according to claim 5 is as described in any one of claims 1 to 4.
In the optical discs described above,
There is a lead-out area on the outer peripheral side of the chapter
The amount of data in the partition area is
It is characterized by less than the amount of data in the
It

[0014]

DETAILED DESCRIPTION OF THE INVENTION An embodiment of the present invention will be described with reference to FIG. FIG. 1 is a block diagram of an embodiment of the present invention. In FIG. 1, 1 is a write-once optical disc (CD-R), 2 is a motor, 3 is a pickup, 4 is a servo circuit, 5 is a laser, 6 is an encoder, 7 is a power control circuit for the laser 5,
Reference numeral 8 is a regenerative amplifier, 9 is a decoder, 10 is a guide signal decoder, 11 is a management information reading unit, 12 is a management information writing unit, 13 is a partition data reading unit, 14 is a determination unit, and 15 is partition data (re).
A writing unit, 16 is a control unit, 17 is an input unit, 18 to 23 are interfaces (I / O), and 24 is a processor (CPU) that performs processing.

Next, the recording operation of the present invention will be described with reference to FIG. In process S1, the servo circuit 4 performs a servo process for controlling the rotation of the motor 2 and the tracking and focus of the pickup 3. In process S2, the control unit 16 instructs the power control circuit 7 to execute the operation shown in FIG.
The output of the laser 5 is increased in the PCA area of the CD-R shown in (A), and the optimum power value for writing is checked.

In the process S3, if the CD-R 1 is an unwritten optical disc, the process proceeds to the process S4, and if it is already written, the process proceeds to the process S9. In step S4, the management information writing unit 12 creates management information and
It is output via O18, encoded by the encoder 6 to modulate the output of the laser 5, and the CD-R from the pickup 3.
1 is irradiated and management information is written.

In step S5, the control unit 7 outputs the recording data input from the I / O 22 via the I / O 18,
Write data to CD-R1. When the writing of the data is completed, in step S6, the partition data (re) writing unit 15 writes the partition data (P).

In step S7, the CD-R1 is input from the input unit 17.
If the input for terminating the writing has not been input, the processing is ended, and if the input has been input, the processing proceeds to step S8 and the processing shown in FIG.
As shown in (A), the lead-out data and the MO are written, and the process ends. Further, if the determination in process S3 is NO, the process proceeds to process S9, and in process S9, the management information reading unit 11 reads the management information from the CD-R 1 via the I / O 20.

In step S10, the partition data reading unit 13 reads the partition data from the address corresponding to the address where the partition data is recorded in the management information read in step S9. In process S11, the determination unit 14 determines whether the data read in process S10 is regular partition data (P). If the determination is YES, the process proceeds to process S12, and if the determination is NO. The process proceeds to step S9, the management information is read, and steps S9 to S11 are repeated.

In step S12, if there is no write area on the CD-R 1, the process proceeds to step S8, and if there is a write area, the process proceeds to step S13. In the process S13, the partition data (re) writing unit 15 rewrites the data (E) different from the regular partition data (P) into the address of the partition data read in the process S10.
Go to 4.

That is, PA of Chapter 1 of FIG. 4 (A)
If (P) is detected at, then (E) is rewritten to the PA of Chapter 1 so that the recording is not (P), and only the PA of the last recorded Chapter (P) is recorded. It In the embodiment, the management information is written in the processing S4 by writing only the management information for the data to be written. However, the management recording for the data recorded before being read in the processing S9 is performed. Information may also be added and writing may be performed.

Further, in the embodiment, when the partition data (P) is detected, (E) is written to write the additional write data so that (P) is written only in the PA of the last Chapter. However, the data is not written in the PA for the additional write data, and when there is an unwritten PA in the additional write, it is determined that this position is the previous write end position, and (P) is written, Then, additional write data may be written.

That is, in the additionally written chapter PA, the SYNC and S # shown in FIG. 4B are written, but the write data is not written. Even with this, S
Since the YNC is written, there is no problem of loss of synchronization. Next, the operation during reproduction will be described with reference to FIG.

When a reproduction command is input from the input unit 17 in the process S21, the process proceeds to a process S22 and the focus, spindle and tracking servo system processes are performed. In step S23, the management information reading unit 11
Reads the management information from the MA of the first Chapter.

In process S24, the partition data reading unit 13 reads data from the address of the partition data in the management information read in process S23. In process S25, the determination unit 14 determines whether or not the data read in process S24 is regular partition data (P). If the determination is NO, the process moves to process S23 to read the management information of the next Chapter. Processing S
23 to S25 are repeated.

If the determination in step S25 is YES, the process moves to step S26, the read management information is referred to, the head is skipped to the position corresponding to the command input in step S21, and the process proceeds to step S27. Read the recorded data. When the reading of the data is completed and the next command is input, the process proceeds to step S26, and when not input, the process ends.

[0027]

As described above, according to the present invention, it is possible to provide an optical disk in which the data recording area is less decreased even if the number of additional recordings is increased and the recording end position can be easily determined.

[Brief description of drawings]

FIG. 1 is a configuration diagram of an embodiment of the present invention.

FIG. 2 is a flowchart of an operation at the time of recording in the embodiment.

FIG. 3 is an operation flowchart during reproduction according to the embodiment.

FIG. 4 is a diagram showing a recording format on a write-once optical disc of the present invention.

FIG. 5 is a diagram showing a recording format on a conventional write-once optical disc.

[Explanation of symbols]

1 Write-once optical disc (CD-R) 2 motor 3 pickups 4 Servo circuit 5 laser 6 encoder 7 Power control circuit 8 Regenerative amplifier 9 decoder 10 Guide signal decoder 11 Management information reading section 12 Management information writing section 13 Partition data reading section 14 Judgment section 15 Partition data (re) writing section 16 Control unit 17 Input section 18-23 interface (I / O) 24 processors (CPU)

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Claims (5)

(57) [Claims] 1. An optical disc in which a plurality of chapters are recorded from an inner peripheral side toward an outer peripheral side , wherein the chapters are physically recorded on the optical disc.
A partition data area that is formed continuously and that has recording data recorded and a partition data that is physically located after the writing data area and that indicates whether or not the recording end position is reached. An optical disc comprising: 2. The optical disk according to claim 1, wherein when the partition data is in a non-written state, it indicates a recording end position. 3. The optical disc according to claim 1, wherein the chapter further comprises, before the write data area, a management information area in which an address of a partition area in the chapter is recorded. 4. The optical disc includes the plurality of chapters.
It has a lead-in area on the inner circumference side of the The amount of data in the management information area is
Contracts characterized by less than the amount of data in the do-in area
The optical disc according to any one of claims 1 to 3. 5. The optical disc includes the plurality of chapters.
Equipped with a lead-out area on the outer periphery of the The amount of data in the partition area is
Claims characterized by less than the amount of data in the out area
Item 5. The optical disc according to any one of items 1 to 4.