JPH0799597B2 - Magneto-optical disk recording device - Google Patents

Description

The present invention relates to a magneto-optical disk recording apparatus for recording / reproducing information such as an image on a magneto-optical disk.

[Prior Art] Conventionally, as a magneto-optical disk recording apparatus for recording and reproducing image information and the like on a magneto-optical disk, for example, one shown in FIG. 3 is known.

In the figure, reference numeral 1 denotes a magneto-optical disk, and as shown in FIG. 4, the magneto-optical disk 1 has a recording area divided into two areas, an outer recording area 1a and an inner recording area 1b. There is.

The magneto-optical disk 1 is set in the magneto-optical disk recording device as shown in FIG.
For example, it is rotated at a constant speed of about 3,600 rpm. Below the magneto-optical disk 1, an erasing / reproducing head 3 and a recording / reproducing head 3 are provided at positions facing each other with the rotation center of the magneto-optical disk 1 interposed therebetween.
Each reproducing head 4 is provided.

The erasing / reproducing head 3 includes a head 3a and an inner recording area corresponding to the outer recording area 1a of the magneto-optical disk 1.
It is composed of a head 3b corresponding to 1b. Similarly, the recording / reproducing magneto-optical head 4 is also composed of heads 4a and 4b corresponding to the respective recording areas.

The erasing / reproducing head 3 and the recording / reproducing head 4
Are mounted on the head sliders 7 and 8, respectively. These head sliders 7 and 8 are provided to be movable in the radial direction of the magneto-optical disk 1 along slide rails 11 and 12 by slider driving magnets 9 and 10, respectively.
The erasing / reproducing head 3a and the recording / reproducing head 4a form a recording area 1a on the outer peripheral side of the magneto-optical disk 1.
Are traced at positions facing each other with the center of rotation interposed therebetween, and similarly, the erasing / reproducing head 3b and the recording / reproducing head 4b respectively trace the inner recording area 1b.

On the other hand, above the magneto-optical disk 1, the magneto-optical disk 1
An erasing bias magnet 5 and a recording bias magnet 6 are arranged at positions corresponding to the erasing / reproducing head 3 and the recording / reproducing head 4, respectively, sandwiching the above.

The erasing bias magnet 5 is the magneto-optical disc 1
, A downward external magnetic field is added as an erasing magnetic field,
On the other hand, the recording bias magnet 6 applies an upward external magnetic field as a recording magnetic field.

The erasing / reproducing heads 3a and 3b and the recording / reproducing head 4
Both a and 4b are connected to the erasing means 14 and the recording / reproducing means 15.

The operation of erasing and recording / reproducing the magneto-optical disk 1 by using the conventional magneto-optical disk recording apparatus thus configured is as follows.

Prior to the recording operation, the erasing heads 3a and 3b erase the upper portion which has already been recorded in each recording area of the magneto-optical disk 1.

First, the erasing bias magnet 5 applies a downward magnetic field to the magneto-optical disk 1, and the erasing means 14 outputs an erasing signal. Based on this signal, the erasing / reproducing head is produced.
3a and 3b irradiate the recording areas 1a and 1b of the magneto-optical disk 1 with spot lights of strong laser beams. And
By heating the irradiated region to a temperature higher than the critical temperature, the magnetization direction of the irradiated region of the magneto-optical disk 1 is aligned downward in the cooling process.

Next, when the magneto-optical disk 1 rotates about half a turn, the recording area erased as described above reaches the relative position of the recording / reproducing heads 4a, 4b. At this time, the recording operation is performed this time.

First, an upward external magnetic field is applied to the erased area of the magneto-optical disc 1 by the recording bias magnet 6, and the recording / reproducing means 15 corresponds to the information to be recorded in the recording areas 1a and 1b, respectively. Divided into recorded signals,
Each recording signal is output to the recording / reproducing heads 4a and 4b. Based on each recording signal, the recording / reproducing heads 4a, 4b irradiate the erasing area of each recording area 1a, 1b with the spot light of the laser beam only when each signal bit is "1".
Then, by heating the irradiated region to a temperature higher than the seaside temperature, the magnetization direction of the irradiated region is reversed in the cooling process. In this way, recording is performed by reversing the magnetization direction of the recording area of the magneto-optical disk 1 in response to the signal bit "1" of the recording signal.

On the other hand, when performing playback operation, erase / playback head 3
Either one of a, 3b or recording / reproducing heads 4a, 4b is used as a reproducing head. For example, when the reproducing operation is performed using the erasing / reproducing heads 3a and 3b, the following operation is performed.

That is, first, the recording / reproducing means 15 outputs a reproduction signal,
Based on this signal, the erasing / reproducing heads 3a, 3b irradiate the recording areas 1a, 1b with spot light of a weak laser beam. The erasing / reproducing heads 3a and 3b read the polarization directions depending on the magnetization direction of the reflected light, and output signals corresponding to the respective reading / reproducing heads 3a and 3b. The recording / reproducing means 15 receives the reproduction signals from the erasing / reproducing heads 3a and 3b, synthesizes the reproduction signals, and outputs the final reproduction signal.

The conventional device performs the recording / reproducing operation as described above.

[Problems to be Solved by the Invention] In the above-described conventional magneto-optical disk recording apparatus, since the transfer rate of the recording signal and the recording time are fixed depending on the number of recording heads, for example, black and white standard image quality In the device for recording / reproducing, there is a problem that recording / reproducing with high color image quality, which requires a higher transfer rate, cannot be performed.

That is, the Y signal, the BY signal, and the RY signal (component signal 2: 0: 0) are sampled and recorded at sampling frequencies of 2 times, 0 times, and 0 times the color subcarrier frequency F _SC. It is possible to record and reproduce in black and white standard image quality, but Y signal, B
-Y signal and RY signal are respectively supplied to the color sub-carrier frequency F _SC.
It was not possible to record / reproduce high-quality color images by sampling and recording at a sampling frequency of 4 times, 2 times, and 2 times (component signal 4: 2: 2).

The present invention has been made in view of such conventional problems, and an object thereof is to obtain a magneto-optical disk recording apparatus capable of recording / reproducing with high image quality in color by increasing the transfer rate to four times that of the conventional one. And

[Means for Solving the Problems] In order to achieve the above object, in a magneto-optical disk recording apparatus according to the present invention, a recording area is divided into two areas, an outer recording area and an inner recording area. A total of 16 magneto-optical heads that perform two corresponding recording / reproducing and erasing operations for each recording area of the four magneto-optical disks; and via the 16 magneto-optical heads. And recording and reproducing means for distributing and recording signals in the outer peripheral side recording area and the inner peripheral side recording area of each magneto-optical disk, and for synthesizing and reproducing each signal from the two recording areas. It is a thing.

[Operation] With the above-described structure of the present invention, a total of eight recording areas each formed of two recording areas provided on four magneto-optical disks are provided with eight recording / reproducing areas corresponding to the respective recording areas. Since recording / reproducing can be performed almost simultaneously via the head, the recording signals are distributed and recorded in eight recording areas, and the signals from the eight recording areas are combined and reproduced, Recording / reproduction can be performed at a transfer rate four times that of the conventional device, and as a result, high-quality recording / reproduction of color that requires high-speed transfer can be performed.

Embodiments Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a configuration diagram showing an embodiment of the present invention. The main configuration of this embodiment is composed of four magneto-optical disk operating parts.
20, 40, 60, 80, signal dividing / combining means 100, erasing signal outputting means 101, and recording / reproducing input / output means 102.

FIG. 2 is a plan view of four magneto-optical disks 21, 41, 61, 81 on which information is recorded / reproduced in each magneto-optical disk operation unit.
It is formed by being divided into 41a, 61a, 81a and inner recording areas 21b, 41b, 61b, 81b. Next, each configuration will be described. First, all four configurations of the magneto-optical disk operating unit are exactly the same. For example, the magneto-optical disk operating unit 20 includes a spindle motor 22, an erasing / playback head 23a.
(For outer recording area), 23b (for inner recording area), recording / reproducing head 24a (for outer recording area), 24b (for inner recording area), erasing bias magnet 25, for recording Bias magnet 26, head slider 27, 28, slider drive magnet 29, 3
0 and slide rails 31 and 32. This configuration is the same as the corresponding part of the conventional device.

Each magneto-optical disk operating section is configured as described above, and the erasing / reproducing heads 23a, 23 of each magnetic disk operating section are arranged.
b, 43a, 43b, 63a, 63b, 83a, 83b, and recording / reproducing heads 24a, 24b, 44a, 44b, 64a, 64b, 84a, 84b are all connected to the signal dividing / combining means 100. There is.

Further, the signal dividing / combining means 100 is composed of the erase signal output means 101
It is also connected to the recording / reproducing signal input / output means 102.

Next, the operation of the apparatus configured as described above will be described.

First, the recording / reproducing operation that requires a high transfer rate such as color image quality is as follows.

The erasing operation is performed prior to the recording operation. Similar to the conventional device, based on the erasing signal from the erasing signal output means 101 in a state in which a downward external magnetic field is applied to each recording area of each magneto-optical disk by each erasing bias magnet of each magneto-optical disk operating unit. Each erasing / reproducing head of the magneto-optical disk operating unit irradiates the spot light of the laser beam to align the magnetization direction of the irradiation region downward.

Next, the recording / reproducing signal input / output means 102 outputs a recording signal corresponding to the information to be recorded to the signal dividing / synthesizing means 100. The signal dividing / combining means 100 divides the input recording signal into eight recording areas corresponding to a total of eight recording areas of each of the four magneto-optical disks, and divides the eight recording signals into each optical signal. Output to each recording / playback head of the magnetic disk operation unit.

In each magneto-optical disk operation unit, each recording / reproducing head was divided from the signal dividing / combining means 100 in a state where an upward external magnetic field was applied by each recording bias magnet, as in the conventional device. Based on the recording signal, the spot light of the laser beam is irradiated onto the recording area only when the signal bit is “1”, and the magnetization direction of the irradiated portion is inverted upward.

Next, the reproducing operation will be described.

The heads used for the reproducing operation are the eight erasing / reproducing heads 23a, 23b, 43a, 43b, 63a, 63b, 83a, 83b or the eight recording / reproducing heads 24a, 24b, 44a, 44b, 64a, Either 64b, 84a, or 84b is used.

For example, erase / playback heads 23a, 23b, 43a, 43b, 63a, 63b, 83
When a and 83b are used, the recording / reproducing signal input / output means 102 first irradiates each recording area with a spot light of a weak laser beam by each head, and a deflection direction depending on the magnetization direction of the reflected light. Is read by each head and output to the signal dividing / combining means 100 as a reproduction signal.

The signal dividing / combining means 100 combines the reproduction signals input from the heads in the order of division during recording operation, and outputs the combined reproduction signals to the recording / reproducing signal input / output means 102. In this way, the information recorded on each magneto-optical disk can be reproduced.

In the above recording / reproducing operation, a series of information to be recorded is divided into, for example, a total of 8 recording areas of 4 magneto-optical disks for each bit, and recording / reproducing is performed. The transfer rate is four times as high as that of an apparatus that records in two recording areas. Therefore, it is possible to sufficiently cope with the case where high-speed transfer is required such as recording / reproducing of color image quality. Moreover, the recording capacity does not decrease in inverse proportion to the transfer rate as in the case where the recording area of one magneto-optical disk is further divided to increase the transfer rate. Can be secured.

The recording / reproducing operation in the case where the transfer rate is increased four times has been described above. However, in the present apparatus, recording / reproducing at a transfer rate twice that of the conventional one or recording / reproducing at the same transfer rate as the conventional one can be performed as it is. it can.

That is, when recording / reproducing is performed at a transfer rate that is twice as high as that of the conventional one, four magneto-optical disks are set in groups of two, and
Recording and reproduction are performed for each group.

For example, a total of four recording areas 21a, 2 on the magneto-optical disk 21, 41
The recording signal divided into four is recorded in 1b, 41a, 41b. This combination can be any two sets of four magneto-optical disks.

By thus dividing the recording signal into four and recording them in four recording areas, the transfer rate becomes twice as high as that of the conventional device.
The recording capacity is also doubled.

Furthermore, when recording / reproducing at the same transfer rate as in the conventional case, it is possible by recording / reproducing on each of the four magneto-optical disks. In this case, the result is the same as using four conventional devices. At this time, the transfer rate is the same as that of the conventional apparatus, but the recording capacity is four times that of the conventional apparatus.

In the embodiment described above, this device can be used by switching to three modes, so that, for example, monochrome standard image quality (conventional transfer rate) and 3: 1: 0 component signal (color standard image quality, double) Transfer rate) and 4: 2:
When handling two-component signals (color high-quality, 4 times the transfer rate), one system can efficiently record and reproduce these signals.

Although the image recording has been described in the above embodiment, the present invention is not limited to the use for recording the image, and may be used as a recording / storing device in other fields such as a high transfer rate storing device for a computer. It can be used.

[Effects of the Invention] As described above, according to the present invention, a total of eight recording areas each including two storage areas provided on four magneto-optical disks are provided.
Since recording / reproducing can be performed almost simultaneously through the corresponding eight recording / reproducing heads, the recording signal is distributed to the eight recording areas for recording, and the recording signals from the eight recording areas are also recorded. By synthesizing and reproducing each signal, it is possible to record / reproduce at a transfer rate four times that of the conventional device, and as a result, it is possible to record / reproduce 4: 2: 2 component signals, which was not possible with the conventional device. There is an effect.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a magneto-optical disk recording apparatus according to the present invention, and FIG. 2 is a recording area 2 used in the present invention.
A plan view of four divided magneto-optical disks, FIG. 3 is a block diagram showing an example of a conventional magneto-optical disk recording apparatus, and FIG.
The figure is a plan view of a magneto-optical disk used in a conventional magneto-optical disk recording apparatus. [Explanation of symbols of main parts] 20,40,60,80 ... Magneto-optical disk operating unit 21,41,61,81 ... Magneto-optical disk 21a, 21b, 41a, 41b, 61a, 61b, 81a, 81b ... ... Recording area 22,42,62,82 ... Spindle motor 23a, 23b, 43a, 43b, 63a, 63b, 83a, 83b ... Erasing / playback head 24a, 24b, 44a, 44b, 64a, 64b, 84a, 84b …… Recording / playback head 25,45,65,85 …… Erasing bias magnet 26,46,66,86 …… Recording bias magnet 27,28,47,48,67,68,87,88… … Head slider 29,30,49,50,69,70,89,90 …… Slider drive magnet 31,32,51,52,71,72,91,92 …… Slide rail 100 …… Signal splitting / combining means 101: erase signal output means 102: record / playback signal input / output means

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Satoshi Nagai Satoshi Nagai 3-228 Asahigaoka, Hino City, Tokyo Inside Asaka Corporation Hino Plant (56) References JP-A-1-94558 (JP, A) JP-A 1-118247 (JP, A)

Claims (1)

[Claims] 1. A four magneto-optical disk operating section for recording / reproducing or erasing information on / from a magneto-optical disk, comprising two erasing heads and two recording heads each also serving as a reproducing head; Erasing signal output means for outputting an erasing signal to each erasing head of each of the four magneto-optical disk operating sections; outputting a recording signal to each of the recording heads of the four magneto-optical disk operating sections, or for recording Or a recording / reproducing signal input / output unit for inputting a reproducing signal from each erasing head; a recording signal outputted from the recording / reproducing signal input / output unit is divided, and a total of the four magneto-optical disk operation units is divided. The divided signals are output to the eight recording heads, or the divided reproduction signals from the total of eight erasing heads or the eight recording heads of the four magneto-optical disk operating units are combined. Input / output the recording / playback An erasing head of the magneto-optical disk operating section for one recording area of a magneto-optical disk whose recording area is divided into two; One recording head is associated with each; information is recorded / reproduced in a total of eight recording areas of a total of four magneto-optical disks set in the four magneto-optical disk operating units. Magneto-optical disk recording device.