JPH01279458A - Optical disk device - Google Patents

Abstract

PURPOSE:To designate whether it is appropriate or not to erase recording data by connecting a data write circuit with an erasing/unerasing data entry circuit for entering data for indicating whether it is appropriate or not to erase the recording data in a subcode area of an optical disk. CONSTITUTION:For a data write mode, data sent out of a data write circuit 3 is fed to an optical pickup 6 via a changeover switch 7. On the other hand, the erasing/unerasing data entry circuit 4 is connected with an erasure inhibiting switch 9 and an erasure permitting switch 10, and by closing the switch 9, erasure inhibiting data for inhibiting a miserasure sent out of the circuit 4 are entered in the subcode area. In addition, the entered erasure inhibiting data can be cancelled by closing the switch 10.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an optical disc device in which erasability data is written in a subcode area of an optical disc.

[Prior Art] Rewritable optical discs include magneto-optical recording type, phase change type, and two-polymer type, but all of them have in common that they use laser light as a recording means. Moreover, these optical discs are different from the current compact disc (CD).
In order to standardize various specifications such as recording/reproducing speed, mechanical dimensions, and modulation method, the reproducing system of optical disc devices necessary for recording and reproducing optical discs is based on the technology developed for CD players. can be reused almost as is. However, the recording system for writing data onto optical disks is currently in the process of being studied using a prototype, and many improvements are expected before it can be put on the market as a mass-produced device.

[Problems to be Solved by the Invention] Since the above-mentioned conventional optical disc device using a rewritable optical disc as a medium can be freely erased and forward-written, it is possible to erase recorded contents that you originally did not want to erase. Since data may be erased by mistake, measures to prevent mistaken erasure are inevitably required. However, methods such as forming a tab on a part of the cassette body to prevent accidental erasure, as with tape cassettes such as audio cassettes and video cassettes, or forming a cutout to prevent accidental erasure, as with floppy disks, cannot be applied. Currently, optical discs have the problem of having to settle for convenient measures against accidental erasure, such as pasting a memorandum on a part of the disc case that houses the optical disc.

[Means for Solving the Problems] The present invention solves the above problems, and includes a data writing circuit for writing data onto a rewritable optical disc, and a subcode area of the optical disc connected to the data writing circuit. The device is characterized in that it is provided with an erasure permission data culprit circuit for writing data indicating whether or not the recorded data can be erased.

[Operation] This invention connects a data write circuit that writes data to a rewritable optical disk with an erasability data culprit circuit that writes data indicating whether or not recorded data can be erased in a subcode area of the optical disk. Erroneous erasure is prevented by erasing permission data written in the area.

[Example J] Hereinafter, an example of the present invention will be described with reference to FIG. 1.2. FIG. 1 is a circuit configuration diagram showing an embodiment of an optical disc apparatus of the present invention, and FIG. 2 is a diagram showing a frame structure of block data recorded on the optical disc shown in FIG. 1.

In FIG. 1, an optical disc device l includes a data writing circuit 3 that writes data to a rewritable optical disc 2;
An erasability data culprit circuit 4 is connected to the data writing circuit 3 and writes data indicating whether or not recorded data can be erased in the subcode area of the optical disc 2.

The optical disc 2 is rotationally driven by a spindle motor 5 and rotates at a constant peripheral speed. The optical pickup 6 scans the recording surface of the optical disc 2 from the inner circumference to the outer circumference, and writes or reads data at this time.

That is, in the data write mode, the changeover switch 7 is switched to the data write circuit 3 side, and the data sent out from the data write circuit 3 is sent to the optical pickup 6 via the changeover switch 7. On the other hand, in the data reading mode, the changeover switch 7 is switched to the data reading circuit 8 side, and the data read from the optical disc 2 by the optical pickup 6 is sent to the data reading circuit 8 via the changeover switch 7. .

The recorded data on the optical disc 2 is as shown in FIG.
One frame consists of a 24-bit frame synchronization signal, a 14-bit symbol subcode, and 32 symbols of data including parity data, which are consecutive with 3 combined bits between each symbol. 98
The frames are collectively called an I block.

The subcodes are P, Q, R, S, T, U, V.

It consists of 8 W channels, and the 2 channels P and Q have already been defined in the standard for cueing the beginning of recorded data and specifying the playback order. However, the use of the 6 R-W channels as backup channels has not been specified, and they are released to the user side. Therefore, in this embodiment, the above-mentioned spare channel in the subcode area is used as a recording area for erasability data.

That is, the erase prohibition switch 9 and the erase permission switch IO are connected to the erase permission/prohibition data culprit circuit 4, and by closing the erase prohibition switch 9, the erase permission/prohibition data input circuit 4 or the erroneous erase sent out from the erase permission switch IO are connected. Erasure prohibition data that prohibits erasure is written in the R channel in the subcode area.

Further, erasure prohibition data written in the R channel can be canceled by closing the erasure permission switch IO. In this case, erasure permission data is recorded in the R channel in the subcode area instead of erasure prohibition data, and the recorded data can be erased at will.

Furthermore, since the above-mentioned subcode area belongs to the program area of the optical disc 2, when erasing or additionally recording on the optical disc, the subcode area is , be sure to read the TOC (Table) in the lead-in area.
or Contents) area 6
It is recommended to scan the .

As described above, the optical disc device 1 includes an erasability data writing circuit that writes data indicating whether or not recorded data can be erased in the subcode area of the optical disc 2 in the data writing circuit 3 that writes data on the rewritable optical disc 2. 4 is connected and the erasability data written in the sub-code area is set to 6 to prevent accidental erasure, so it is possible to prevent accidental erasure by mechanical measures like tape cassettes and floppy disks. On the optical disc 2, which is different from the recording medium, the subcode area released as the writing area of the user pit can be used as the writing area for erasability data, and it is possible to specify whether or not the recorded data can be erased. Since the erasability data written in the area can be canceled at any time, the manner in which the optical disc 2 is used can be easily changed as necessary.

In the embodiment, the R channel of the subcode area is used to record the erasability data, but the erasability data may be recorded in any of the other spare channels S-W.

[Effects of the Invention] As explained above, the present invention provides erasability data that writes data indicating whether or not recorded data can be erased in the subcode area of the optical disc, in a data writing circuit that writes data to a rewritable optical disc. Since the input circuit is connected and the erasability data written in the subcode area is used to prevent accidental erasure, this recording medium can be prevented from accidental erasure by mechanical measures, such as tape cassettes and floppy disks. For optical discs different from the above, the subcode area released as the writing area of the user pit can be used as the writing area for erasability data, and it is possible to specify whether the recorded data can be erased. Since the erasability data that has been created can be canceled at any time, excellent effects such as being able to easily change the manner in which the optical disc is used as needed are achieved.

[Brief explanation of the drawing]

FIG. 1 is a circuit configuration diagram showing an embodiment of an optical disc apparatus of the present invention, and FIG. 2 is a diagram showing a frame structure of block data recorded on the optical disc shown in FIG. 1. ! 19. Optical disc device, 2. ．． ．． optical disk. 301. data writing circuit, 4. ,, Erasability data entry circuit.

Claims (1)

[Claims] A data writing circuit that writes data to a rewritable optical disk, and a device connected to this data writing circuit,
An optical disc device comprising: an erasability data entry circuit that writes data indicating whether or not recorded data can be erased in a subcode area of the optical disc.