JPS62167620A - Optical disc file device - Google Patents

Abstract

PURPOSE:To read correctly a collation number by providing a laser light output adjusting circuit adjusting the output of a laser light in the unit of tracks of blocks in writing the collation number onto an optical disc. CONSTITUTION:A system section 1 is so constituted that a laser output adjusting circuit 4 is controlled based on a detection signal of a recording state detection circuit 9 and the recording intensity of a collation number written in the optical disk 8 is made proper. A linear motor moves a pickup 7 toward the collation number region 8a formed at the center of the optical disc 8 and set in the writable state. Then a signal added with the collation number set by a collation number generating circuit 2 to an address generated by an address generating circuit 3 is given to a laser modulation circuit 6 to modulate the output of the circuit 4 and to give the result to the pickup 7, the laser optical output is controlled and one track (block) of the collation number is written. Thus, in reading the collation number from the optical disk, accurate readout is attained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an optical disc file device that writes and reads a reference number on an optical disc using a laser beam.

[Prior art]

An optical disk file device that has a built-in data floppy to record the address information of the optical disk requires the identification number of the optical disk and the identification number of the data floppy that records the address information to search and register information on the optical disk. Generally, if the information does not match, the information will not be searched or registered. The identification number of the optical disk and the identification number of the data floppy are written simultaneously by a command signal from the system of the optical disk file device, but the identification number recorded on the optical disk is written in the identification number area of the optical disk by a constant laser light output. This is done with an appropriate number of tracks.

[Problem that the invention seeks to solve]

By the way, the sensitivity of the recording film in the reference number area of an optical disc varies from one optical disc to another, and when writing a reference number on an optical disc, due to the difference in the sensitivity of the recording film, it may not be possible to accurately write a reference number with a constant laser light output. This may cause the inconvenience that writing cannot be performed. Furthermore, after a long period of time has elapsed after the optical disc is manufactured, the sensitivity of the recording film of the optical disc may become dull and writing may not be possible unless the laser light output is increased. Therefore, when writing the reference number on an optical disc with a certain number of trunks using a constant laser light output, if the laser light output during writing is too high for the recording sensitivity of the optical disc, the focus generated on the optical disc will be The focus becomes larger than that which should originally be recorded, and the RF multiplied signal eye pattern falls, making it difficult to read out the correct verification number. On the other hand, if the laser light output is too low, the focus will be smaller than that which should originally be recorded, and the RF multiplied signal eye pattern will rise, making it difficult to read out the correct reference number in this case as well.

In this way, if the laser light output is too high or too low and is not appropriate for the sensitivity of the recording film, the reference number cannot be written accurately, and the reference number on the optical disk and the data floppy are compared. There may be cases where this becomes impossible.

[Means for Solving the Problems] The present invention solves the above-mentioned problems, and when writing a reference number on an optical disk, it is configured to change the laser light output in each trunk or block. , an object of the present invention is to propose an optical disc file device that can always accurately read reference numbers.

The present invention includes (1) or a plurality of optical discs, and one or more recording media on which search information for information recorded on the optical disc is recorded, and a correspondence relationship between the optical disc and the recording medium is established. In an optical disc file device configured to record a reference number on an optical disc using a laser beam, a laser light output adjustment circuit adjusts the output of the laser light in units of tracks or blocks when writing the reference number on the optical disc. It is characterized by having the following.

[Effect]

When writing a reference number onto an optical disc, the laser light output is adjusted in accordance with the sensitivity of the recording film of the optical disc. Therefore, the verification number has an appropriate writing strength for the optical disc, and the verification number can always be read accurately.

〔Example〕

The present invention will be described in detail below based on drawings showing embodiments thereof.

FIG. 1 is a block diagram of an optical disc file device according to the present invention, and FIG. 2 is a plan view showing the schematic structure of the optical disc.

In FIGS. 1 and 2, l is a system section,
The command signals of this system unit 1 are a verification number generation circuit 2 in which the verification number is set, an address generation circuit 3 that sets the position where the verification number is written, and a laser output adjustment circuit that adjusts the output of the laser beam for writing the verification number. It is designed to be given to 4. The output signals of the verification number generation circuit 2 and the address generation circuit 3 are supplied to a laser modulation circuit 6, which modulates laser light for writing the verification number, through an OR circuit 5, respectively. and laser modulation circuit 6
The output signal is a pin that emits laser light.

A laser beam is inputted to the quasop 7 and modulated by the laser modulation circuit 6, and is emitted from the pickup to write the reference number onto the optical disk 8. In addition, the laser modulation circuit 6 includes a laser output adjustment circuit 4.
An output signal is given, and the output of the laser light emitted from the pickup 7 can be changed depending on the output signal. On the other hand, when the pinkup 7 finishes writing to one trunk, the system section l
Issue a command signal to read out one trunk's worth of verification numbers that have been written, and write the read verification numbers as a record! The i5 detection circuit 9 inputs the signal to detect the recording intensity, and the detection signal is input to the system unit 1 to check whether the recording intensity is appropriate. When an inappropriate recording intensity is detected, a command signal is given to the laser output adjustment circuit 4 to change the laser light output emitted by the pink-up 7 so that the recording intensity becomes appropriate, and the recording intensity is adjusted to an appropriate level. After confirming that this is the case, the control operation for writing the next one trunk is performed in the same manner as described above, and the control operation is repeated until the writing for a predetermined trunk is completed.

In other words, the system section 1 is configured to control the laser output adjustment circuit 4 based on the detection signal of the recording state detection circuit 9, so as to make the recording intensity of the reference number written on the optical disc 8 appropriate.

When writing a verification signal to the optical disc 8 as shown in FIG. 2 using the optical disc file device configured as described above, the system section 1 is activated to issue a command signal for writing the verification number. The pickup 7 is moved by a linear motor (not shown) to the optical disc 8.
is moved to the verification number area 8a formed at the center of the disc, and is set in a writable state.

Thereafter, a signal obtained by adding the verification number set by the verification number generation circuit 2 to the address generated by the address generation circuit 3 is given to the laser modulation circuit 6, which modulates the output of the laser output adjustment circuit 4 and picks it up. 7, control its laser light output, and write one trunk of verification numbers. When the writing for this l track is completed, the pickup 7 successively outputs the verification numbers for the l trunk for which writing has been completed, the recording state is detected by the recording state detection circuit 9, and the detection signal is input to the system section l. be done. The system unit 1 checks the recording state on the optical disc 8 based on the manually inputted detection signal, and if the recording state is strong, the laser light output of the pink-up 7 during writing is weakened, and vice versa. gives a command signal to the laser output circuit 4 to increase the laser light output during writing. As a result, the laser light output is changed and the verification number for one track is written again. Then, the rewritten verification number 1 trunk is read out again by the pink amplifier to detect the recording state, and the detection signal is input to the system section 1 to check whether or not the recording state is proper. If the recording status is appropriate, the next 1 after the verification number
Writing for a track is performed in the same manner as for writing for one track described above. By repeating these operations, it is possible to appropriately write the reference number on each track in a proper recording state in accordance with the sensitivity of the recording film of the optical disc.

Therefore, the verification number written in this manner can always be read accurately from any trunk, and there is no problem even when writing the verification number on an optical disk that has been manufactured for many years.

In this embodiment, the laser light output is adjusted in units of trunks, but it goes without saying that similar adjustments may be made in units of blocks.

〔effect〕

As described above, according to the present invention, when writing a reference number on an optical disc, the laser light output is changed in units of track number or block number to obtain an appropriate recording intensity depending on the sensitivity of the recording film of the optical disc. , accurate reading is possible even when the reference number is not read from the optical disk, and the problem of being unable to match the reference number of the optical disk with the reference number of the data floppy is solved, and other excellent effects are achieved.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the main parts of an optical disc file device according to the present invention, and FIG. 2 is a schematic structural diagram of the optical disc.

Claims (1)

[Claims] 1, comprising one or more optical discs and one or more recording media recording search information for information recorded on the optical discs, and a collation showing a correspondence relationship between the optical discs and the recording media. An optical disc file device configured to record numbers on an optical disc using laser light, comprising a laser light output adjustment circuit that adjusts laser light output in units of tracks or blocks when writing the reference number on the optical disc. An optical disc file device characterized by: