JPS632130A - Optical disk and recording/reproducting device - Google Patents

Abstract

PURPOSE:To decrease the retrieval time of data by providing a mean recording/ reproducing a data into/from an optical disk and a means recording/reproducing a signal into/from a semiconductor memory built in the optical disk. CONSTITUTION:In writing/reading directly information 101, a directly read/write control section 4 sends a memory control signal 105 to a memory interface 12 in semiconductor memory section 7 via transmission/reception contact sections 10, 11 to transit/receive an input/output data 106. The memory interface 12 separates the received memory control signal 107 and an input/output data 108 into an address 109, a data 110 and a write enable signal 111 or the like for a memory 13 in use and writes the result into the memory 13 or therefrom. Thus, the access time for directly retrieval is reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an optical disc and an information recording/reproducing apparatus for recording and reproducing information on an optical disc, and more particularly to a write-once optical disc and its recording/reproducing apparatus.

2. Description of the Related Art Conventional write-once optical discs and recording/reproducing devices thereof record signals by evaporating the recording film with a laser beam to form holes in the recording film. So-called -degree recording can be reproduced any number of times, and unlike magnetic disks, it is not possible to repeatedly record and reproduce data in the same sector.

Problems to be Solved by the Invention However, in the case of optical discs such as those mentioned above where recording, reproduction, and erasure cannot be performed, the directory for managing the data recorded on the optical disc cannot be deleted, so a new directory must be added and recorded. When playing live,
It first searches for the sector written at the end of the directory, reads the sector backwards, reads the desired sector, and then accesses the sector that records the desired data. This means that it takes a very long time to search for the target data.

Also, when updating data, although the directory information for each file is shorter than the sector length, one sector per one directory is used to prevent accidents such as power outages and forgetting to close files when finished using them. , sector capacity was used inefficiently.

SUMMARY OF THE INVENTION In view of the above, an object of the present invention is to provide an optical disc equipped with a semiconductor memory that can freely perform recording, reproduction, and erasure on an optical disc, and a recording/reproducing apparatus therefor.

Means for Solving the Problems The present invention is an optical disc in which a semiconductor memory is built into a disc base material, and a contact portion for transmitting and receiving data with the semiconductor memory is provided on the surface of the disc base material. The present invention also provides means for recording and reproducing data on an optical disc;
This is a recording and reproducing device that includes means for recording and reproducing signals in a semiconductor memory built into an optical disc.

Effects of the present invention With the above-described configuration, management information such as a directory that requires rewriting can be recorded in the semiconductor memory built into the optical disc base material, and by using the rewriting function of this directory area and the large-capacity write-once optical disc. Realizes the erase disk function.

Example Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing an overview of the present invention.

When the host computer 1 wants to write data on an optical disc, the host computer 1 sends command information 100 instructing writing to the optical disc controller cpty3 in the optical disc recording/reproducing device 2, and also sends directory information 101. Send data information 102. The directory read/write control section 4 and the data read/write control section 5 in the optical disk recording and reproducing apparatus 2 perform data writing in response to read/write control signals 103 and 104 from the optical disk controller CPUa. The directory read/write controller 4 writes directory information 101 to the semiconductor memory section 7 in the optical disc 6, and the data read/write controller 6 writes additional information to the optical disc through a general optical recording/reproducing system 8 using a laser. Data information 102 is written into the memory section 9.

Further, when the host computer 1 wants to read data from the optical disc 6, the host computer 1 sends command information 100 instructing the optical disc controller CPU 3 to read data. The directory read/write control section 4 and the data read/write control section 6 in the optical disk recording and reproducing apparatus 2 read data in response to the read/write control signal 1o3.degree. 104 from the optical disk controller CPU3. The directory read/write control section 4 reads directory information from the semiconductor memory section 7 of the optical disk 6, and the data read/write control section 5 reads data information from the optical disk write-once memory section 9 based on the read directory information.

With this configuration, the directory information can be rewritten, so when the directory is rewritten many times to update file contents, if the directory is written on a write-once disk, the search for the target directory will be difficult. Problems that took a long time can be resolved.

A method for reading and writing directory information to a semiconductor memory will be described in more detail. The optical disk recording/reproducing device 2 and the semiconductor memory section 7 in the optical disk base material are connected by a device-side transmitting/receiving contact section 10 and a semiconductor memory-side transmitting/receiving contact section 11. This contact is, for example, an electrical contact made of a conductive gold shoulder strip for transmitting electrical signals, and is connected when the disk is installed in the device.

When writing or reading directory information 101,
Directory read/write control section 4 sends a memory control signal 106 to memory interface 12 in semiconductor memory section 7 via transmission/reception contact section 10.11, and transmits/receives input/output data 106. The memory interface 12 transfers the received memory control signal 107 and input/output data 108 to the memory 13 in use, including an address 109, data 110, and a write enable signal 1.
11, etc., and write to and read from the memory 13. Here, it is appropriate for the input/output data 112 between the contacts on the device side and the contacts on the disk side to be transferred in a bit-serial manner due to the limited number of contacts. In addition, the memory control signal 113 is a minimum input/output data 112
If there is an input/output data direction line that specifies the direction of the data, it becomes possible to record and reproduce data in the semiconductor memory.

The memory 13 in the optical disc base material is, for example, a static RAM or the like, but in this case, a backup power source 14 is required to prevent the contents of the RAM from being erased. However, if an electrically erasable EEPROM is used and power is supplied from the device only when a disk is mounted, the backup power supply 14 may not be necessary. However, the contact portion requires a power supply line from the device side. If a backup power source is provided, the memory can be set to a low-current standby mode when no disk is attached by using the signal indicating disk attachment as the chip select signal of the semiconductor memory.

FIG. 2 shows an embodiment of an optical disc and an optical disc recording and reproducing apparatus according to the present invention. Figure 2a shows a bottom view of a clamper that clamps a disc in an optical disc recording/reproducing device, Figure 2 is a side view of the optical disc being loaded into the device, and Figure 2C is a top view of the optical disc being loaded. Show the diagram. 15 is a clamper for the disk, and 16 is a disk motor for rotating the disk. As shown in FIG. 2a, on the surface of the clamper 16 that comes into contact with the disk, a transmitting/receiving contact 10 on the device side is made of circular metal foil. As shown in FIG. 2C, a disk-side transmitting/receiving contact 11 is made of metal foil on the inner side of the write-once memory section 9 of the disk and on the surface that contacts the damper 16. With such a configuration of the transmitting and receiving contacts, when the disk 6 is clamped to the disk motor 16 by the lever 16 as shown in FIG. The transmitting/receiving contact 10 on the disk side and the transmitting/receiving contact 11 on the disk side are connected. In the optical disc 6, the memory interface 12 of the semiconductor memory section 7 is located at the inner circumference inside the write-once memory section 9, which is a data recording area. Memory 13. A backup power supply 14 etc. is embedded.

Furthermore, in this embodiment, a mode has been described in which directory information is transmitted and received through electrical contact between the clamper section and the disk section, but the transmitting and receiving means may be implemented using other electrical contact methods, or optical means using a photocube 2 or the like. It goes without saying that magnetic means using a magnetic head or the like do not depart from the spirit of the present invention.

As described in detail, according to the present invention, management information such as a directory that needs to be rewritten is recorded in a memory having a non-volatile function built into an optical disc base material. By rewriting the area and using a large-capacity write-once optical disc, it functions like an erasable disc, making it possible to shorten the access time for directory searches.

Furthermore, when directories are frequently rewritten, the disk usage efficiency is much better than when directory information is written to a write-once optical disk in one sector per one directory, and its practical effects are great.

[Brief explanation of drawings]

Fig. 1 is a block diagram of the optical disc recording and reproducing device and the optical disc according to the present invention, Fig. 2a is a bottom view of the clamper that clamps the disc in the optical disc recording and reproducing device, and Fig. 2 shows when the optical disc is installed in the device. side view,
FIG. 2C is a top view of the mounted optical disc. 15... Clamper, 16... Disc motor, 100... Command, 101...
...Directory information, 102... Data information, 103, 104... Read/write command signal,
105, 107, 113... Memory control signal,
106, 108, 112... Input/output data, 1
09...Address, 110...Data, 111...Write enable signal.

Claims (10)

[Claims] (1) An optical disc characterized in that a semiconductor memory is built into a disc base material, and a contact portion for transmitting and receiving data with the semiconductor memory is provided on the surface of the disc base material. (2) The optical disc according to claim 1, wherein the semiconductor memory built into the disc base material has a nonvolatile function. (3) The optical disc according to claim 1, wherein the semiconductor memory is embedded in the inner peripheral portion of the optical disc. (4) The optical disc according to claim 1, characterized in that a contact portion is formed inside the recording track of the optical disc. (5) The optical disk according to claim 1, wherein the contact portion of the semiconductor memory has at least a data input/output line and a data input/output direction line, and data is recorded and reproduced bit serially. (6) The optical disk according to claim 1, wherein the contact portion of the semiconductor memory is formed of an electrical, magnetic, or optical contact. (7) The optical disc according to claim 1, wherein the chip select signal of the semiconductor memory is a signal indicating that the disc is mounted. (8) An optical disc recording and reproducing apparatus comprising means for recording and reproducing data on an optical disc and means for recording and reproducing data in a semiconductor memory built into the optical disc base material. (9) The optical disk recording and reproducing apparatus according to claim 8, wherein the disk clamp section of the optical disk has a contact point with the contact section of the semiconductor memory. (10) The optical disc recording and reproducing apparatus according to claim 8, characterized in that data is recorded and reproduced in a bit serial manner in a semiconductor memory.