JPH05166188A - Magneto-optical disk device - Google Patents

Abstract

PURPOSE:To normally read, write a medium by controlling the laser power so as to secure the maximum output of the read data on the medium. CONSTITUTION:A magneto-optical disk medium of an optional producer is attached to a magneto-optical disk device, and a test area is read by several times. Meanwhile the reflected light of the medium is detected by a read photosensor 7 and this detection output is supplied to a peak detector. Then the output is fed back to a current-driven automatic adjustor 2 in a loop. The test area is also read by several times while the laser power is changed by the adjustor 2 which adjusts automatically the voltage applied to a laser diode. Thus the output of a detector 5 shows the maximum level and the laser power which can secure the satisfactory reading operation is automatically obtained. This laser power is confirmed by the adjustor 2. Thus it is possible to automatically control the laser power so as to secure the normal read/write operations even for a medium of a different producer.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magneto-optical disk device, and more particularly to a read / write process for a magneto-optical disk medium manufactured by a manufacturer different from the manufacturer of the magneto-optical disk device.

[0002]

2. Description of the Related Art FIG. 2 is a schematic block diagram of a head portion in a conventional example of a magneto-optical disk device. From the magneto-optical disk medium, a write power controller 1 and a read power controller 4 for controlling the intensity of light emitted from the laser diode 3 (hereinafter referred to as laser power) according to the necessity of writing and reading, that is, reproduction and reading. A lead photo sensor 7 for receiving the reflected light, an amplifier 6, and a peak detector 5 for detecting read data are included.

Conventionally, laser power has been
The current drive 22 adjusts the strength in the factory so that writing and reading on the magneto-optical disk medium manufactured by the same manufacturer give the best results, and the laser power can be easily adjusted by the user. It wasn't like that.

[0004]

The performance of the magneto-optical disk device and the magneto-optical disk medium is based on the international standard.
Although the physical standards are unified, a certain range is recognized for the level of laser power for recording / reproducing and the sensitivity of the recording surface on the magneto-optical disk medium. There is a drawback that a user who owns a device manufactured by another manufacturer cannot read / write the magneto-optical disk medium, which is a product of the same manufacturer, recorded by the device. It was

An object of the present invention is to enable automatic adjustment of laser power so that when a magneto-optical disk medium, which is a product of a manufacturer different from the apparatus manufacturer, is mounted, the read / write operation of the medium can be normally performed. An object of the present invention is to provide a magneto-optical disk device.

[0006]

The magneto-optical disk apparatus of the present invention has a maximum sensitivity by reading the test area of the magneto-optical disk medium a plurality of times when the magneto-optical disk medium is mounted and the power is turned on. It has means for setting the output level of the laser power corresponding to the read result shown.

[0007]

The optimum laser power for the read of the mounted medium is automatically obtained by adjusting the laser power so that the output of the peak detection circuit for detecting the read data of the magneto-optical disk medium is maximized, Remember.

[0008]

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

FIG. 1 is a schematic block diagram of a head portion in an embodiment of the magneto-optical disk device of the present invention. The head section includes a write power controller 1, a read power controller 4, a current drive automatic regulator 2, a laser diode 3, a peak detector 5, an amplifier 6 and a read photo sensor 7. The current-driven automatic adjuster 2 is obtained by adding a voltage adjusting function for automatically adjusting the voltage to the laser diode to the current driver 22 shown in the conventional example of FIG. 2, and further has an interface with the peak detector 5. This is different from the conventional example.

Next, the operation of this embodiment will be described.

A magneto-optical disk medium, which is a product of an arbitrary manufacturer (for example, A), is attached to the magneto-optical disk device, the power is turned on, and then the test area of the medium (unique sector not opened to the user). Automatically lead several times. At this time, the light reflected from the same medium is detected by the read photosensor 7, the output current thereof is amplified by the amplifier 6, and the output of the peak detector 5 for detecting the read data is fed back to the current drive automatic regulator 2. Then, the output of the peak detector 5 shows the maximum value by reading the test area several times while changing the laser power by the current-driven automatic adjuster 2 that automatically adjusts the voltage to the laser diode. The laser power for good reading is automatically obtained, the optimum value of the laser power for the magneto-optical disk medium, which is a product of manufacturer A, is confirmed, and the current-driven automatic adjuster 2 is confirmed.

As described above, the optimum value of the laser power for the magneto-optical disk medium manufactured by any manufacturer can be automatically obtained and the current-driven automatic adjuster 2 can be confirmed.

FIG. 2 shows that the magneto-optical disk medium is read between the upper limit value and the lower limit value of the laser power specified for the products of companies A, B, and C3 for an arbitrary magneto-optical disk medium, and the peak value of 6 is a flow chart in the case of obtaining the highest current value (hereinafter referred to as a test lead), obtaining the optimum value of the laser power for each company's product, and setting it in the current-driven automatic adjuster of the magneto-optical disk device.

The magneto-optical disk device is loaded with an arbitrary magneto-optical disk medium, the power is turned on (step 11), and the read data is read at the upper and lower limit values specified by the company A (step 12). If is normal, the above-mentioned test read is performed to obtain and set the adjustment value of the current-driven automatic adjuster 2 so as to obtain the laser power at which the output of the peak detector 5 becomes maximum (step 13). If the above-mentioned read data is not normally obtained, the read is performed at the upper and lower read values specified by Company B (step 14). If normal read data is obtained at this time, the test read is performed as in step 13. To set and store the optimum value between the upper and lower limits (step 1
5). If the above read data is not normal, the data is similarly read with the upper and lower read values specified by Company C (step 16), and if normal data is obtained, the same test read is performed to obtain the optimum value. After setting and storing (step 17), if normal read data cannot be obtained, set the current drive regulator to the optimum value for the laser magnetic disk medium manufactured by the manufacturer of the laser magnetic disk device (step). 18) Finish the work. For the laser disk media of companies A, B, and C3 where the optimum laser power was obtained between the specified upper limit value and lower limit value, the test values were automatically read by the adjustment values stored in the current drive adjuster without performing test reading. The laser power is adjusted, and normal read / write is performed.

[0015]

As described above, according to the present invention, the head portion in the magneto-optical disk device is provided with the laser power current drive automatic adjuster for reading / writing the magneto-optical disk medium. It has an interface with a peak detector that detects read data, and finds the optimum laser power for reading the read in the test area of any magneto-optical disk medium while automatically changing the laser power, By storing the data in the current-driven automatic adjuster, it is possible to use the magneto-optical medium manufactured by any manufacturer and to ensure compatibility regardless of the manufacturer of the magneto-optical disk medium.

[Brief description of drawings]

FIG. 1 is a schematic block diagram of a head portion in an embodiment of a magneto-optical disk device of the present invention.

FIG. 2 shows A, B, C for arbitrary magnetic disk media.
6 is a flow chart in a case where optimum values of laser power for products of three companies are obtained and stored in a magneto-optical disk device.

FIG. 3 is a schematic block diagram of a head portion in a conventional example of a magneto-optical disk device.

[Explanation of symbols]

 1 write power controller 2 current drive automatic regulator 3 laser diode 4 read power controller 5 peak detector 6 amplifier 7 lead photo sensor

Claims (1)

[Claims] 1. A magneto-optical disk device for reading / writing a magneto-optical disk medium, wherein a test area of the magneto-optical disk medium is read a plurality of times when the magneto-optical disk medium is mounted and the power is turned on. A magneto-optical disk device having means for setting an output level of laser power corresponding to a read result showing the highest sensitivity.