JPH0426924A - Magneto-optical disk device - Google Patents

Abstract

PURPOSE:To collate data in a short time by comparing the stored data of a buffer with the data reproduced from an optical pickup exclusive for reproduction with a comparator after inputting these data, and outputting an error signal indicating the recording of the recorded data is illegal when these both data are not coincident with each other. CONSTITUTION:An optical pickup 1 exclusive for recording records the inputted data to this magneto-optical disk 4 as the recording data. An optical pickup 2 exclusive for reproduction reproduces the recording data recorded to the magneto-optical disk 4 and outputs this data as the reproducing data. A buffer 5 tentatively stores the data to be inputted to the optical pickup 1 exclusive for recording. A comparator 6 inputs the stored data of the buffer 5 and the data reproduced from the optical pickup 2 exclusive for reproduction and compares both inputted data, thereafter when both data are not coincident with each other, the error signal is outputted to indicate the recording of the recorded data is illegal. Thus, the time for collating the data can be shortened.

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to a magneto-optical disk device.

(Prior Art) Conventional magneto-optical disk devices of this type have an optical pickup that is used for both recording and reproducing, such as recording data on the magneto-optical disk and reproducing data from the magneto-optical disk. Some are used as molds.

(Problems to be Solved by the Invention) In magneto-optical disk devices, it is necessary to check whether data has been correctly recorded on the magneto-optical disk (verify operation) in order to improve the reliability of recorded data.

In order to verify the above data, in a conventional magneto-optical disk device using a wearable recording/reproducing optical pickup, data is first recorded on the magneto-optical disk by the optical pickup, and then the optical pickup is moved to the recording position of the data. A method was adopted in which the data was restored to , and then the data was played back, and the playback data was verified by comparing it with the recorded data.

However, for such data verification, it is necessary to return the optical pickup to the recording position, but in order to accurately control the return for data verification, a fairly complex control circuit and control mechanism are required. This has the disadvantage of increasing the cost of the entire magneto-optical disk device.

A particularly serious drawback is that it takes a considerable amount of time to control the optical pickup back to the recording position, and therefore a considerable amount of time is required for data verification.

Therefore, in the present invention, in order to make the optical pickup dedicated to recording and reproduction only, it is necessary to add one more hole to the optical pickup compared to the recording/reproduction-only type, but the overall circuit/mechanism is In general, it is possible to reduce the overall cost of the magneto-optical disk device by making it simpler than before, and in particular, it is possible to perform data verification in a much shorter time than before. It is intended to be.

(Means for Solving the Problems) In order to achieve such an object, the magneto-optical disk device of the present invention includes a recording-only optical pickup, a reproduction-only optical pickup, and a data collation circuit. A dedicated optical pickup is for recording input data on a magneto-optical disk as recorded data, and a read-only optical pickup is for reproducing recorded data recorded on a magneto-optical disk and converting it into playback data. The data matching circuit is a buffer,
and a comparison circuit, the buffer temporarily stores the data input to the recording-only optical pickup, and the comparison circuit compares the data stored in the buffer with the data stored in the buffer.
It inputs playback data from a playback-only optical pickup, compares both input data, and outputs an error signal indicating that the recording data is incorrect if the two data do not match. It is characterized by certain things.

(Function) The recording-only optical pickup records input data on a magneto-optical disk as recording data.

A reproduction-only optical pickup reproduces recorded data recorded on a magneto-optical disk and outputs this as reproduced data. In the data matching circuit, the buffer temporarily stores the data input to the recording-only optical pickup. Then, the comparison circuit inputs the data stored in the buffer and the playback data from the playback-only optical pickup, and compares both input data.If the two data do not match, the recorded data is incorrectly recorded. outputs an error signal indicating that

(Example) Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a diagram showing the configuration of essential parts of a magneto-optical disk device according to an embodiment of the present invention, and FIG. 2 is a time chart for explaining the operation of the magneto-optical disk device.

The magneto-optical disk device of this embodiment includes a recording-only optical pickup 1, a reproduction-only optical pickup 2, and a data collation circuit 3.

The recording-only optical pickup 1 is configured to record input data onto a magneto-optical disk 4 as recording data. The read-only optical pickup 2 has a magneto-optical disk 4.
It is arranged on the downstream side in the rotational direction A of the recording-only optical pickup 1 and at a predetermined distance from the recording-only optical pickup 1, and reproduces recorded data recorded on the magneto-optical disk 4 by the recording-only optical pickup 1. , this is output as playback data.

The data matching circuit 3 includes a buffer 5 and a comparison circuit 6.

The buffer 5 temporarily stores the data input to the recording-only optical pickup 1, and the comparison circuit 6
inputs the data stored in the buffer 5 and the playback data from the playback-only optical pickup 2, and compares both input data, and if the two data do not match, the recorded data is incorrectly recorded. The operation is explained with reference to the time chart in Figure 2.
First, after time 10, the recording-only optical pickup 1 starts recording data onto the magneto-optical disk 4 as recording data RIR2, . . . in the form shown in FIG. 2(a). After the same time to, this data is also stored in the buffer 5 as the stored data M1. as shown in FIG. 2(b). M2. ...
Memory begins as. Then, the recorded data R1, R2, etc. of FIG. 2(a) is recorded on the magneto-optical disk 4.
After time tl after time T has elapsed from time to, the reproduction data PIP2 is reproduced as shown in FIG. ．． ... and then playback begins. This reproduction data PI, P2. ... are simultaneously output to the comparator circuit 6 after the same time t1.

Then, the buffer 5 is stored for a time T after the data is input.
After the lapse of time, that is, after time tl, the stored data is changed to the stored data M! , M2, . . . are outputted to the comparator circuit 6, the comparator circuit 6 sequentially outputs the stored data Ml, M2, . . . from time t1. ... and playback data PI, P2.・・・
. . , and the matching/mismatching of both data is checked, and all the checking is completed at time t2 when the recording of a series of data ends. As a result of this series of comparisons, it is determined whether or not there is a mismatch between the two data. In the example of FIG. 2, the recorded data are R1, R2, R3, and R4, and correspondingly the stored data are M 1 , M2, M3.
．． and M4, and the playback data is also PI.

Although it should be R2, R3, and R4, the reproduced data is PI, R2, and R3, and the stored data M
Since the recorded data R4 corresponding to No. 4 is not correctly recorded on the magneto-optical disk 4, and therefore the reproduced data P4 is missing, it is determined that the two data do not match, and the comparator circuit 6 The error signal indicating that data is not recorded correctly on disk 4 is shown in Figure 2 (
It outputs as shown at time t2 in d).

This error signal is given to a microcomputer (not shown) inside the magneto-optical disk device, and in response to the input of the error signal, the microcomputer performs a predetermined action such as stopping the data recording operation on the magneto-optical disk 4. can perform actions.

In this way, in the magneto-optical disk device of this embodiment, it is possible to detect whether or not the data has been recorded correctly almost at the same time as the data is recorded by the recording-only optical pickup l.・Since there is no need to return the optical pickup to the data recording position unlike in a magneto-optical disk device equipped with a playback optical pickup, the time required for data verification can be significantly shortened. Furthermore, complicated circuits and mechanisms for controlling the return of the optical pickup are not required.

(Effects of the Invention) As is clear from the above explanation, according to the present invention,
Although it is necessary to add one more optical pickup than the conventional recording/playback type in order to make the optical pickup dedicated to recording and playback only, each optical pickup for recording only and playback only has two optical pickups. Since data is recorded and reproduced almost simultaneously and data is verified using a simple circuit, the structure is simple and the cost increase of the entire magneto-optical disk device can be suppressed.

In particular, in the present invention, since data can be verified almost simultaneously with recording, the data verification time can be significantly reduced compared to the conventional method.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the configuration of essential parts of a magneto-optical disk device according to an embodiment of the present invention, and FIG. 2 is a time chart for explaining the operation of the magneto-optical disk device. l... Optical pickup only for recording, 2... Optical pickup only for reproduction, 3... Data verification circuit, 4... Magneto-optical disk, 5... Buffer, 6... Comparison circuit. Applicant Sharp Co., Ltd.

Claims (1)

[Claims] (1) It has a recording-only optical pickup (1), a reproduction-only optical pickup (2), and a data matching circuit (3). The recording-only optical pickup (1) transfers input data to a magneto-optical disk ( The read-only optical pickup (2) is for recording data on the magneto-optical disk (4).
) and outputs it as reproduced data, and the data verification circuit (3)
has a buffer (5) and a comparison circuit (6), the buffer (5) temporarily stores the data input to the recording-only optical pickup (1), and the comparison circuit (6) inputs the data stored in the buffer (5) and the playback data from the playback-only optical pickup (2), compares both input data, and if the two data do not match, record the data. 1. A magneto-optical disk device that outputs an error signal indicating that data recording is incorrect.