JPH01220127A - Information recording and reproducing device - Google Patents

Abstract

PURPOSE:To prevent miserasure and misoverwrite due to turning on a strong laser beam by irradiating a recording medium in the subject information recording and reproducing device with different power laser beams and inhibiting the laser from being turned on when recording or erasing is indicated by the device mode at the time of recording and/or reproducing and/or erasing a bit of information. CONSTITUTION:A laser driving signal 4 is supplied from a laser driving circuit 2 of the information recording and reproducing device to a laser 1, and a recording instruction signal 6 and an erasing instruction signal 7 are supplied to the circuit 2, and also the recording instruction signal 6 and the erasing instruction signal 7 are supplied to a CPU 3. By this CPU 3, the laser being turned on is discriminated at the 1st step, and the presence of the recording instruction signal 6 and the erasing instruction signal 7 is acknowledged at the 2nd and 3rd steps, and then a laser turning-on signal 5 is outputted to the circuit 2 at the 4th step. Then, when recording or erasing is indicated by the operation mode of the recording and reproducing device, the laser 1 is inhibited from being turned on, thus preventing miserasure and misoverwrite due to the strong laser beam at the 5th step.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an information recording and reproducing apparatus that records and/or reproduces and/or erases information by irradiating an information recording medium with a light beam.

[Conventional technology]

A magneto-optical disk is formed by forming a magnetic thin film having an axis of easy magnetization perpendicular to the film surface on a substrate, and records information by changing the magnetization direction of this magnetic thin film. During recording, the magnetization direction of the magnetic thin film is first aligned in one direction 1, and a radar beam digitally modulated according to the information signal is irradiated while applying a bias magnetic field in the opposite direction to the magnetization direction. do. Then, the temperature of the area irradiated by the radar beam rises to near the Curie point, the coercive force decreases, and the area is magnetized in the opposite direction to the surrounding area due to the influence of the bias magnetic field, forming a magnetization pattern according to the information. . Information recorded in this manner can be optically read out using the well-known magneto-optic effect by irradiating the medium with a low-power, unmodulated beam. Furthermore, by applying a magnetic field in the opposite direction to the bias magnetic field during recording, recorded information can be erased.

Due to the nature of information recording and reproducing devices such as magneto-optical disk devices, the laser power during recording and erasing is approximately several to ten times higher than the laser power during reproducing.
Requires armpits. And when this is played back - Day 1? When the power is turned on, the set value of the radar power is reproduction/4'war, so the light is turned on without any special attention.

[Problem to be solved by the invention]

However, in the conventional information recording/reproducing device as described above, even if the laser power setting value is set to the mode for recording or erasing due to an external instruction or a failure of the circuit inside the device, there is no error. Since the laser was turned on under certain conditions, there was a problem in that the information on the medium could be destroyed in some cases.

〔the purpose〕

The present invention was made in view of the above-mentioned problems of the prior art, and its purpose is to solve the problem when the laser power instruction is in the recording or erasing mode or when a circuit failure in the device occurs. Another object of the present invention is to provide an information recording/reproducing device that does not destroy information recorded on an information recording medium even when a radar is turned on.

[Means to solve the problem]

According to the present invention, the above object can be achieved by irradiating radar beams of different powers onto an information recording medium that enables information recording and/or reproduction and/or erasure. Or for an information recording and reproducing device that performs erasing; the information recording and reproducing device is characterized in that the information recording and reproducing device prohibits the lighting of a laser when the mode of the device instructs recording or erasing. Ru.

〔Example〕

Hereinafter, embodiments of the present invention will be described specifically and in detail based on the drawings.

FIG. 1 is a schematic diagram showing a laser control section of an information recording/reproducing apparatus according to the present invention.

In the figure, reference numeral 1 denotes a radar for recording, reproducing, and erasing information. 2 is a laser drive circuit for lighting the laser 1; 3 is a CPU that controls the laser drive circuit 2.

4 is a radar drive signal indicating a signal sent from the laser drive circuit 2 to the laser 1 to turn on the radar. Reference numeral 5 denotes a radar lighting signal that is sent from the CPU 3 to the radar drive circuit 2 and is a signal for controlling the timing at which the radar 1 is lit. Reference numeral 6 denotes a recording instruction signal 1 indicating a signal for lighting a radar 7 having power necessary for recording information on an information recording medium (not shown). Reference numeral 7 designates an erase instruction signal 1 indicating a signal for lighting a laser 1 having the power necessary to erase information from an information recording medium (not shown).

Next, the operation of the information recording/reproducing apparatus of the present invention will be explained using FIG.

FIG. 2 is a flowchart for explaining the operation of the radar control section of the information recording/reproducing apparatus of the present invention.

In Stella 7'l of Fig. 2, it is determined whether or not there is an instruction to turn on the laser 1, and if there is no instruction to turn on the laser 1 (NO in the figure), the processing of the flowchart is illustrated. Proceed until the end.

If there is an instruction to turn on the laser 1 (YES in the figure), proceed to the next Stella 7''2.

In the Stella 7'2, it is determined whether the recording instruction signal 6 for lighting the laser 1 at the time of recording is in the access state or not, and it is determined that the recording instruction signal 6 is in the access state. If so (YES), proceed to step 5. If the recording instruction signal 6 is not in the access state (NO), the process advances to the next step 3.

In step 3, it is determined whether the erase instruction signal 7 for lighting the laser 1 during erasing is in the access state, and it is determined that the erase instruction signal 7 is in the access state. If so (YES), proceed to step 5. If the erase instruction signal 7 is not in the access state (NO), the process advances to the next step 4.

In step 4, the radar is operated at a playback/mother power which is smaller than the power during recording and the power during erasing.
Turn on 1. Then, the process of the flowchart is continued until the end as shown in the figure.

In step 5, processing is performed to ignore the instruction to turn on radar 1 and prohibit it from being turned on by recording power or erasing power (error in step 5). Then, the processing of the flowchart is ended.

〔Effect of the invention〕

The information recording/reproducing apparatus of the present invention as described above confirms the mode for instructing recording or erasing before turning on the laser, so that erroneous erasure or overwriting of the information recording medium due to strong laser beam lighting can be prevented. It can be prevented.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing a laser control section of the information recording/reproducing apparatus of the present invention, and FIG. 2 is a flowchart for explaining the operation of the information recording/reproducing apparatus of the present invention. 1... Laser, 2... Laser drive circuit, 3...
-CPU, 6... Record instruction signal, 7... Erase instruction signal. 1 (Embedded Patent Attorney Seki Yamashita Hei No. 1 No. 2 Figure 1g1 Tsuru So

Claims (1)

[Claims] (1) Information recording and reproducing that records and/or reproduces and/or erases information by irradiating laser beams of different powers to an information recording medium that enables recording and/or reproduction and/or erasure of information. In the device; The information recording and reproducing device is characterized in that the information recording and reproducing device prohibits lighting of a laser when a mode of the device instructs recording or erasing.