JPH02257483A - Optical disk and optical recording and reproducing device - Google Patents

Abstract

PURPOSE:To erase and rewrite a directory area and to construct a latest directory area even when a data is renewed and recorded by providing a semiconductor memory capable of reading and writing a data on an optical disk. CONSTITUTION:The semiconductor memory 4 capable of reading and writing the data is embedded on the optical disk 1, and this semiconductor memory 4 is stored of contents corresponding to a table of contents and an index of a bit of information to be recorded and reproduced in an information recording area 2 of the optical disk. Consequently, even in the case of a DRAW type optical disk, the directory area can be erased and rewritten. By this method, the information recording area 2 of the optical disk 1 is effectively utilized, and the directory area is exactly arranged so that the latest directory area is constructed without uselessness.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an optical disc and an optical recording/reproducing apparatus for recording and reproducing information on the optical disc.

Conventional technology On write-once optical discs, data can be recorded only once, and the recorded data cannot be erased or rewritten. ) can also be erased and cannot be rewritten in the same way as the data area.

Problems to be Solved by the Invention If the directory area cannot be erased and rewritten as in the past, each time the data area is updated, new directory areas are added one after another while leaving the past directory area. become. If the directory area cannot be modified, a problem arises in that when dealing with data that needs to be updated frequently, a large number of directory areas must be reserved in advance, making it difficult to use the optical disc effectively. Furthermore, it was necessary to construct the latest directory area while accurately organizing many directory areas from the past, which created another problem in that directory management became extremely complex.

Because of these two problems, the use and spread of write-once optical discs have been severely limited.

The present invention enables the directory area to be erased and rewritten even when data is updated and recorded on a write-once optical disc, so that the data recording area of the optical disc can be used effectively and the directory area can be accurately defined. The purpose is to organize and build the latest directory area.

Means for Solving the Problems In order to achieve the above object, in the optical disc of the present invention, a semiconductor memory from which data can be read and written is provided on the optical disc, and this semiconductor memory is capable of recording and reproducing information in the information recording area of the optical disc. Accumulate content equivalent to a table of contents or an index of information. In optical recording and reproducing devices,
An electrical contact part is provided on both the optical disc and a turntable part on which the optical disc is mounted and rotated or a clamping part that fixes the optical disc to the turntable part, and power is supplied to the semiconductor memory through this electrical contact part. It also reads and writes data in the semiconductor memory.

Effects The present invention has the above-described configuration so that even when data is updated and recorded on a write-once optical disc, the directory area can be erased and rewritten, and the recording area of the optical disc can be used effectively. It is possible to organize the directory area accurately and construct the latest directory area.

Embodiment Hereinafter, an optical disc and an optical recording/reproducing apparatus according to an embodiment of the present invention will be described with reference to the drawings. FIG. 4 shows an optical disc in a first embodiment of the present invention. In FIG. 1, l is an optical disc, 2 shows the optically recordable and reproducible area, 3 shows the center hole, which is used for positioning when the optical disc is attached to the rotation mechanism of the optical recording/reproducing device, and 4 shows the center hole. It is a semiconductor memory,
5a+6a embedded in the base of the optical disc.

Reference numeral 7a indicates an electrical contact portion, which is exposed on the surface of the optical disc. 5a is a terminal for supplying power to the semiconductor memory 4a, 6a is a ground terminal, and 7a is a serial data terminal for reading and writing data in the semiconductor memory 4.

FIG. 2 shows a rotating mechanism for an optical disc in an optical recording/reproducing apparatus. Reference numeral 8 denotes a disc motor for rotating the optical disc 1. As shown in FIG. A turntable 9 on which the optical disc 1 is mounted is attached to the rotating shaft 10 of the disc motor 8. On the turntable 9 are annular electrical contacts 5b, 6b, 7b.
are provided, and when the optical disc is mounted on the turntable 9, the electrical contact parts 5a and 6a provided on the optical disc
.

Make sure to make keyaki that makes contact with 7a. Furthermore, it is connected to an external circuit via brush contact parts 5c, 6c, and 7c attached to the rotating shaft 10.

FIG. 3 shows the configuration of the optical recording/reproducing apparatus of the present invention. 1 represents an optical disk in which a semiconductor memory 4 is embedded. As the semiconductor memory 4, EEFROMI 2, which is a non-volatile memory that can be electrically written and read, is considered to be suitable. The semiconductor memory 4 connects the serial communication interface L3a to EEPROMI so that data can be exchanged using one data line, that is, one terminal.
Connect to 2. The optical recording/reproducing apparatus is composed of an optical disk drive 14 and a host system 15. The data in the semiconductor memory 4 is transferred to the keyaki explained in FIGS. 1 and 2, and the data terminal 7a of the optical disk and the optical disk drive 1.
4 through electrical contact with the data terminal 7b. In the optical disk drive 14, serial data from the optical disk is connected to the serial communication interface 13b, converted to parallel data, and sent to the internal path line 18.
will be sent to. Directory management of the data area of the optical disc is executed by the host system 15. Therefore, the directory information to be written into or read from the semiconductor memory is handled by the host interface 16a.

16b. The file management system 17 issues execution commands for writing or reading directory information.

Next, a procedure for updating data that has already been optically recorded in the information recording area 2 will be described. First, the file management system 17 sends a directory area search command to the optical disk drive 14 via the host interfaces 16a and 16b in order to search for a directory area indicating a file to be updated. is serial communication interface 1
3a.

The semiconductor memory 4 (EEFROM 12) embedded in the optical disc 1 is accessed via the optical disc 13b.

When the corresponding directory area is searched, the file management system 17 rewrites the file with a new file name.
Sends a directory area change command. Similarly, the optical disk drive 14 accesses the semiconductor memory 4, erases the old directory, and rewrites it with a new directory salt and a new search position of the data area on the optical disk 1. Finally, the file management system 17 sends out a data write-once recording command in order to optically record new file data in the information recording area 2 of the write-once optical disc 1. The optical disk drive 14 searches for an unrecorded information recording area 2 on the optical disk and optically records data of a new file.

As described above, according to this embodiment, the semiconductor memory 4 from which data can be read and written is embedded in the optical disc 1, and the semiconductor memory 4 contains a table of contents and an index of information to be recorded and reproduced in the information recording area 2 of the optical disc. By accumulating contents equivalent to , the directory area can be erased and rewritten even on a write-once optical disc, and the information recording area 2 of the optical disc can be used effectively and the directory area can be used accurately. You can organize and build the latest directory area without wasting anything.

Effects of the Invention As described above, according to the present invention, a semiconductor memory from which data can be read and written is provided on an optical disk, and this semiconductor memory corresponds to a table of contents or an index of information to be recorded and reproduced in the information recording area of the optical disk. By accumulating the contents, even when data is updated and recorded on a write-once optical disc, the directory area can be erased and rewritten, and the recording area of the optical disc can be used effectively. It is possible to organize areas accurately and construct the latest directory area.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram of an optical disc in an embodiment of the present invention, FIG. 2 is a configuration diagram showing a rotation mechanism of an optical disc in an optical recording/reproducing apparatus of the present invention, and FIG. 3 is a configuration diagram of an optical recording/reproducing apparatus of the present invention. It is a diagram. 1... Optical disc, 2... Information recording area, 4... Semiconductor memory, 5.6.7...
...Electrical contact part, 9...Turntable part.

Claims (6)

[Claims] (1) An optical disc equipped with a semiconductor memory from which data can be read and written. (2) The optical disc according to claim (1), wherein the semiconductor memory stores contents corresponding to a table of contents or an index of information to be recorded and reproduced in an information recording area of the optical disc. (3) An electrical contact part is provided on both the optical disc and the turntable part on which the optical disc is mounted and rotated, or the clamping part that fixes the optical disc to the turntable part, and the connection to the semiconductor memory is made through this electrical contact part. The optical disc according to claim 1, wherein power is supplied and data in the semiconductor memory is read and written. (4) An electrical contact part is provided on both the turntable part on which the optical disc is mounted and rotated, or the clamping part that fixes the optical disc to the turntable part, and the optical disc, and the connection to the semiconductor memory is made through this electrical contact part. An optical recording and reproducing apparatus for recording and reproducing an optical disc according to claim 3, which supplies power and reads and writes data in the semiconductor memory. (5) The optical disc according to claim (1), wherein reading and writing of data in the semiconductor memory is performed in the form of serial data transfer. (6) The optical disc according to claim (1), wherein the information recording area has a write-once format in which recorded data cannot be erased or rewritten.