JPS62246193A - Optical disk device - Google Patents

Abstract

PURPOSE:To improve the reliability of retrieval information and shorten data access time by incorporating a non-volatile random access read/write memory (RAM) in a cartridge where an optical disk carrier is stored and recording retrieval information for data on the optical disk carrier in this RAM. CONSTITUTION:A RAM 5 is accessed through a connector 8 attached to one end face of an optical disk cartridge 2. A controller 7 accesses the RAM 5 of an optical disk cartridge 1 through a RAM recording and reproducing means 6 and records new retrieval information additionally to current retrieval information and record data on the optical disc carrier 1 through a recording and reproducing control means 4. In case of data reproducing, the controller 7 reads out contents of the RAM 5 through the RAM recording and reproducing means 6 and calculates physical track address and sector address to read objective data by the recording and reproducing control means 4.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an optical disk device that optically records and reproduces digital information for information processing and information such as audio or video using a focused light beam. .

[Conventional technology]

Conventionally, means for recording search information for searching data recorded on a write-once optical disc carrier include (1) recording specific search information in a data recording area (data area) on the optical disc carrier; Either create an area and record the search information in that area, or (2) create a host system that uses an optical disk device using other storage means such as a small hard disk device or floppy disk device. A search information recording means is used.

When the search information recording means as described above uses the search information area provided in the data area on the (+) optical disc carrier, the search information is first read out when the optical disc is loaded into the optical disc device. When data is sequentially recorded on an optical disc carrier and reaches a certain amount of data, the search information is generally updated and added to the search information area. At this time, in order to ensure that the reliability of the search information is higher than the reliability of the data, it is often recorded twice in two places, and therefore the ratio of the search information area to the data recordable area on the disk assembly is This is a factor that reduces data usage efficiency.

In addition, in order to access the data on the disk, the optical head is first moved to the search information area to read the search information, and based on the contents, the optical head is moved to the data area again to read the data. As a result, the time required to move the optical head increases, the data access time becomes longer, and the processing related to the movement of the optical head becomes complicated.

On the other hand, if the search information is managed by a storage device in the host system, there is a risk that the data in the optical disk will become invalid if the data in the storage device is destroyed for some reason. This risk is particularly high when the search information is on a floppy disk medium. In other words, since the optical disk carrier is carried around while being housed in a cartridge, the floppy disk medium on which search information related to the optical disk carrier is recorded may also be carried around, and there is a risk that the search information on the floppy disk will be destroyed. is large. Moreover, the task of replacing the US disk cartridge is also complicated.

[Problem that the invention seeks to solve]

The problem to be solved by the present invention, in other words, the purpose of the present invention is to effectively solve the drawbacks of the search information storage means of the conventional optical disk device as described above, and to provide highly reliable search information storage. An object of the present invention is to provide an optical disc device having means.

[Means for solving problems]

The optical disc device of the present invention includes an optical head that is loaded with an optical disc cartridge that accommodates a write-once optical disc carrier and has a built-in nonvolatile random access read/write memory (RAM), and that records or reproduces information on the optical disc carrier. , a recording/reproducing control means for controlling the operation of the optical head including recording or reproducing operation of information, focus control, and tracking control; and recording/reproducing control means for controlling the operation of the optical head, including control of information recording or reproducing operation, focus control, and tracking control; An optical disc device comprising a RAM recording and reproducing means for recording or reproducing search information for information, and a controller connected to a host device and controlling the recording and reproducing control means and the RAM recording and reproducing means, the optical disc carrier When recording information on the non-volatile random access read/write memory, the record of search information for the information is updated, and when the optical head performs an access operation, the search information is reproduced and referred to. be done.

〔Example〕

Next, the present invention will be explained in detail with reference to the drawings.

FIG. 1 is a block diagram showing one embodiment of the present invention.

As shown in the figure, the optical disc device is equipped with a laser light source and turns on and off the laser light in response to electrical signals input from a host device to irradiate focused light onto an optical disc carrier 1 to form bits. an optical head 3 that records information on the optical disc carrier 1 and reads the information recorded on the optical disc carrier 1 by irradiating a constant amount of laser light and changing the reflected light; and an optical head 3 that records information on the optical disc carrier 1 through the optical head 3 recording and reproducing control means 4 for controlling the recording and reproducing operations of the optical head 3 and controlling the focus and tracking of the focusing lens in the optical head 3; A RAM recording and reproducing means 6 that records and reproduces information in a memory (hereinafter referred to as RAM) 5, and receives and receives commands and data from a host system to control the recording and reproducing control means 4 and the RAM recording and reproducing means 6. The controller 7 is configured to include a controller 7 that performs the following operations.

FIG. 2 is a plan view showing the structure of an example of an optical disc cartridge used in the embodiment of FIG. 1.

In FIG. 2, an optical disc cartridge 2 accommodates an optical disc carrier 1 and also includes a RAM 5 in a part thereof. Access to the RAM is via a connector 8 attached to one end surface of the optical disc cartridge 2. The connector 8 is electrically connected to the RAM recording/reproducing means 6 provided in the optical disc device when the optical disc cartridge is loaded into the optical disc device.

The connector 8 includes a power line, a ground line, an address line, a recording/reproduction control line, etc. for the RAM 5.

The capacity of the RAM 5 is determined by the capacity of the data on the optical disc carrier 1 and the number and size of input data. In this case, since one A4 size page can be input as approximately 100 kilobytes using data compression technology, approximately 10,000 pages can be stored on one optical disc. Therefore, if the search information is expressed as 3 bytes, 1 byte, and 3 by I for each data recording start address, number of sectors used, and search keyword in units of one page of data, it has a capacity of approximately 70 kilobytes. By using the RAM 5, search information for all document files can be recorded.

Next, the operation of the embodiment shown in FIG. 1 will be explained.

When the controller 7 receives an instruction and data to record data from the host system, it derives search information such as address information on the optical disc carrier 1 on which the data is to be recorded and keywords for the recorded data from the instruction and data. . Next, the controller 7 accesses the RAM 5 of the optical disc cartridge 1 via the RAM recording/reproducing means 6,
New search information is additionally recorded to the current search information, and then data is recorded on the optical disc carrier 1 via the recording/reproduction control means 4. In addition, when reproducing data, the controller 7 first reads the contents of the RAM 5 via the RAM recording and reproducing means 6, determines the location of the target data in the optical disc carrier 1, that is, the physical track address and sector address, and records and reproduces the data. The control means 4 reads out the target data.

〔Effect of the invention〕

As described above in detail, the optical disc device of the present invention has a nonvolatile random access read/write memory (RAM) built into the cartridge that accommodates the optical disc carrier, and stores search information for data on the optical disc carrier. This has the effect of increasing the reliability of search information. In addition, search information in RAM can be easily rewritten within the optical disk device, so
Data access processing when adding or deleting data In particular, the process of accessing the optical head to two locations on the optical disk carrier, the search information area and the data area, as required in the past, is no longer necessary, reducing data access time. The effect is that it can be done. Furthermore, there is also the effect that the risk of damage to the search information caused by carrying the optical disc cartridge can be significantly reduced.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention, and FIG. 2 is a plan view showing the configuration of an example of an optical disc cartridge used in the embodiment of FIG. DESCRIPTION OF SYMBOLS 1... Optical disc carrier, 2... Optical disc cartridge, 3... Optical head, 4... Recording and reproduction control means,
5...Nonvolatile random access read/write memory (RAM), 6...RAM recording/reproducing means, 7...
・Controller, 8...Connector.

Claims (1)

[Claims] an optical head loaded with an optical disc cartridge that accommodates a write-once optical disc carrier and has a built-in nonvolatile random access read/write memory (RAM), and records or reproduces information on the optical disc carrier; recording and reproducing control means for controlling information recording or reproducing operation and operation control including focus control and tracking control; and recording or retrieving information for information to be recorded on the optical disk carrier in the nonvolatile random access read/write memory; An optical disc device comprising a RAM recording and reproducing means for performing reproduction, and a controller connected to a host device to control the recording and reproducing control means and the RAM recording and reproducing means, when recording information on the optical disc carrier. An optical disk device characterized in that recording of search information for the information is updated in the nonvolatile random access read/write memory, and the search information is reproduced and referenced during an access operation of the optical head.