JPH01118245A - Magneto-optical disk recorder - Google Patents

Abstract

PURPOSE:To accelerate a transfer rate to four times and to realize recording and reproduction with high color picture quality by performing the recording and reproduction by using 8 magneto-optical heads corresponding to the recording areas of two optical disks whose recording areas are quartered. CONSTITUTION:Eight recording areas in total are provided on two magneto- optical disks 21 and 22 whose recording areas are quartered, and a signal is distributed to and recorded in the eight recording areas by a recording and reproducing means 49a and an erasing means 49b by using eight magneto-optical heads 26a, 26b, 32a, 32b, 38a, 38b, 44a, and 44b corresponding to respective area, and also, each signal is synthesized and reproduced from those eight recording areas. In such a way, the transfer rate of four times compared with that of a device having two heads and the recording and reproducing with high color picture quality can be performed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a magneto-optical disk recording device for recording and reproducing information such as images on a magneto-optical disk.

[Conventional technology]

2. Description of the Related Art Conventionally, as a magneto-optical disk recording apparatus for recording and reproducing image information etc. on a magneto-optical disk, for example, those shown in FIGS. 3 and 4 are known.

FIG. 3 shows a magneto-optical disk serving as a recording medium, and FIG. 4 shows the configuration of a magneto-optical disk recording apparatus.

As shown in FIG. 3, the magneto-optical disk 1 is divided into an outer recording area 1a and an inner recording area 1b, which are rotated at a constant speed by a spindle motor 2, as shown in FIG. Below the magneto-optical disk l, there are magneto-optical heads 3a, 3b for erasing/reproducing, magneto-optical head 4a for recording/reproducing,
4b are arranged opposite to each other with the center of rotation of the magneto-optical disk 1 interposed therebetween.

The erasing/reproducing heads 3a and 3b are mounted on the hendo slider 5, and the head slider 5 is moved in the radial direction along the slider rail 7 by a slider drive v1 (ff magnet, and the erasing/reproducing head 3a is mounted on the outer peripheral recording area 1a. The erasing/reproducing head 3b also traces the inner recording area 1b.

The same holds true for the recording/reproducing heads 4a and 4b, which are mounted on the hen slider 8 and can be moved in the radial direction along the guide rail 10 by the slider drive magnet S. That's what I do.

Above the magneto-optical disk 1, an erasing electromagnet 11 and a recording electromagnet are installed at positions corresponding to the erasing/reproducing heads 3a, 3b and the recording/reproducing nozzles 4a, 4b via the magneto-optical disk 1, respectively. 12 are arranged. The erasing electromagnet 11 applies, for example, a downward external magnetic field to the magneto-optical disk 1 as an erasing magnetic field, and the recording electromagnet 12 applies an upward external magnetic field as a recording magnetic field. Further, the heads 3a, 3b, 4a, 4b are connected to recording/reproducing means tSa and erasing means 13b.

The operations for erasing, recording and reproducing the magneto-optical disk 1 using the conventional magneto-optical disk recording device configured as described above are as follows.

First, prior to a recording operation, the recording area of the magneto-optical disk 1 is erased by the magneto-optical heads 3a and 3b.

In this erasing operation, the erasing/reproducing nozzles 3a and 3b irradiate the respective recording areas 1a and 1b of the magneto-optical disk 1 with a strong laser beam spot light to heat them above the critical temperature in response to the output signal of the erasing means 13b. During the cooling process, the erasing electromagnet 11 applies a downward magnetic field to the magneto-optical disk 1 to align the downward magnetization direction of the disk 1.

When the thus erased portion of the magneto-optical disk 1 rotates approximately half a turn and reaches the relative position of the recording/reproducing heads 4a, 4b, the recording/reproducing means 13a moves the recording/reproducing heads 4a, 4b.
The heads 4a and 4b respectively irradiate the recording areas 1a and 1b of the magneto-optical disk 1 with sub-nod light in response to the signal bit "1", and raise the irradiated area to a critical temperature or higher. In the process of heating and subsequent cooling, the recording electromagnet 12 applies an upward recording magnetic field to the irradiated portion, thereby reversing the magnetization direction upward, thereby performing recording.

On the other hand, during reproduction, the erasing/reproducing heads 3a, 3
b or recording/reproducing head 4a, 4b is used as a reproducing head, for example, the erasing/reproducing head 3
a, 3b irradiate each recording area 1a, 1b with a weak laser beam spot light by the recording/reproducing means 13a,
The erasing/reproducing nodes 3a and 3b read the polarization direction depending on the magnetization direction of the reflected light, and thereby the reproducing section receives each signal from the heads 3a and 3b, and synthesizes the respective signals. Reproduce.

[Problem that the invention seeks to solve]

In the conventional magneto-optical disk recording device described above, the transfer rate of the recording signal and the recording time are fixed depending on the number of recording heads. The device has a problem in that it cannot record and reproduce high-quality color images that require a higher transfer rate.

That is, twice the color subcarrier frequency FsC, 0 times the color subcarrier frequency FsC, and 0 times the color subcarrier frequency FsC.
Although it is possible to record and reproduce the black and white standard WJ quality by sampling and recording the Y signal, B-Y (No. 8, R-Y signal (component signal 2: O20) at twice the sampling frequency,
signal, B-Y signal, and R-Y (No.
It was not possible to record and reproduce high-quality color images by sampling and recording with component (No. 3, 4:2:2).

Therefore, the present invention has been made in view of these conventional problems, and it is an object of the present invention to provide a magneto-optical disk recording device that can perform recording and reproduction at a transfer rate four times faster.

[Means for solving problems]

In order to achieve the above object, the present invention will be described with reference to FIGS. 1 and 2 corresponding to the embodiment. two magneto-optical disks (2L22) divided into four in the direction and forming these recording areas (21a to 21d, 22a to 22d); each of the recording areas of the magneto-optical disks (21, 22); (2
Eight magneto-optical heads (26a, 26b, 32a, 32b, 38a, 38b) perform recording, reproduction and erasing in association with each of the 1a to 21d, 22a to 22d).
, 44a, 44b); and the eight magneto-optical heads (26a, 44b);
, 26b, 32a, 32b, 38a, 38b, 44a,
44b), the eight recording areas (21a to 21
d, 223 to 22d) and record signals to eight recording areas (21a to 21d, 22a to 22d).
) recording and reproducing means (49) for synthesizing and reproducing each signal from the
It is characterized by having the following a) and;

[Effect]

According to the above configuration, a total of eight recording areas (21
a to 21d, 22a to 22d), and correspondingly eight magneto-optical heads (26a, 26b, 32a, 32
The recording/reproducing means (49a) uses eight recording areas (213 to 21d,
In order to allocate and record signals to 223 to 22d) and to synthesize and reproduce each signal from 8 recording areas (21a to 21d, 22a to 22d), recording and reproduction is performed at a transfer rate four times that of the conventional one. As a result, it is possible to record and reproduce color high quality 71II at a transfer rate that is four times faster.

〔Example〕

An embodiment of the present invention will be described based on FIGS. 1 and 2. FIG. 1 is a schematic side view of a magneto-optical disk recording device equipped with two magneto-optical disks 21.22, and FIG. 2 is a top view of the two magneto-optical disks 21.22 in FIG. , shows a state in which the recording area is divided.

As shown in FIG. 2, the two magneto-optical disks 21 and 22 used in the present invention each have four recording areas 21a to 21d, 22a in the radial direction from the outer circumference to the inner circumference.
It is divided into ~22d.

As shown in FIG. 1, the two magneto-optical disks 2L22, each having a recording area divided into four, are mounted on a magneto-optical disk recording device and are moved by the spindle motors 23, 24.
Each rotates at a constant speed, for example, 3.60 rpm.

In FIG. 1, below one magneto-optical disk 21 is a magneto-optical head 26a mounted on a head slider 25.
2eb is provided, and the hent slider 25 is provided so as to be movable in the radial direction along the cross slider rail 28 by a slider drive magnet 27. magneto-optical disk 21
An electromagnet 29 is disposed above the magneto-optical disk 22 at a position facing the magneto-optical healds 26a and 26b, and the electromagnet 28 controls the direction of the magnetic field applied to the magneto-optical disk 21 by a magnet switching circuit 30. It is possible to switch. That is, during erasing, the electromagnet 29 applies a downward erasing magnetic field to the magneto-optical disk 21, and during recording, it applies an upward recording magnetic field to the magneto-optical disk 21.

Further, below the magneto-optical disk 21, there is a magneto-optical disk 2
A hent slider 31 is disposed at a position facing the head slider 25 through the center of rotation of the hent slider 31, and magneto-optical heads 32a and 32b are mounted on this hent slider 31. The head slider 31 is a slider driving magnet 3
It can move in the radial direction along the guide rail 34. An electromagnet 35 is arranged above the magneto-optical disk 21 at a position corresponding to the magneto-optical disks 32a and 32b via the magneto-optical disk 21, and the electromagnet 35 is also applied to the magneto-optical disk 21 by a magnet switching circuit 36. The direction of the magnetic field can be switched; a downward erasing magnetic field is applied during erasing, and an upward recording magnetic field is applied during recording.

Below the other magneto-optical disk 22, 15 magneto-optical heads 38a and 38b are mounted on a hent slider 37, and the head slider 37 is moved in the radial direction along the slider rail 40 by a slider drive magnet 3S. Can be done. An electromagnet 41 is disposed above the magneto-optical disk 22 at a position corresponding to the magneto-optical heads 38a and 38b via the magneto-optical head 22, and the electromagnet 41 also controls the magnetic field applied to the magneto-optical disk 22 by a magnet switching circuit 42. The direction can be switched; a downward erasing magnetic field is applied during erasing, and an upward recording magnetic field is applied during recording.

Further, below the magneto-optical disk 22, there is a magneto-optical disk 2
A head slider 43 is disposed at a position facing the hent slider 37 across the center of rotation of the head slider 4, and magneto-optical heads 44a and 44b are mounted on the head slider 4. The head slider 43 can be moved in the radial direction along the guide rail 4G by the slider drive magnet 45. An electromagnet 47 is arranged above the magneto-optical disk 22 at a position corresponding to the magneto-optical heads 44a and 44b via the magneto-optical disk 22, and the electromagnet 47 also controls the magnetic field applied to the magneto-optical disk 22 by a magnet switching circuit 48. The direction can be switched; a downward erasing magnetic field is applied during erasing, and an upward recording magnetic field is applied during recording.

Constructed as described above, eight magneto-optical heads 26a, 2
6b, 32a, 32b, 38a, 38b, 44a, 44
Each of b performs recording/reproducing and erasing, and a recording/reproducing means 49a connected to these magneto-optical heads distributes and records signals to the eight recording areas, and also synthesizes each signal from the eight recording areas. The eraser 49b erases the recordings in the eight recording areas via the eight magneto-optical heads.

Next, the operation of the above embodiment will be explained.

First, recording and reproducing operations that require a high transfer rate, such as high-quality color images, are as follows.

First, in the erasing operation performed prior to recording, the electromagnets 29.35 apply a downward erasing magnetic field to the magneto-optical disk 21 by the magnet switching circuits 30.36, and at the same time, one of the magnet switching circuits 42.48 causes the TL magnets 41. 47 applies a downward erasing magnetic field to the magneto-optical disk 22. Furthermore, by moving the first slider 25, the magneto-optical head 26a is moved to the outermost recording area 21a of the magneto-optical disk 21, and the magneto-optical head 26b is moved to the third recording area 21C from the outer periphery.
The movement of the second slider 31 moves the magneto-optical head 32a to the second recording area 21b from the outer periphery.
By moving the third slider 37, the magneto-optical head 38a is moved to the outermost recording area 22a of the magneto-optical disk 22, and the magneto-optical head 38b is moved to the third recording area from the outer circumference. At 22C, the fourth slider 43 moves to move the magneto-optical head 44a 2 from the outer periphery.
In the th recording area 22b, the magneto-optical radar 44b is made to correspond to the innermost recording area 22d. In this way, each recording area 21a to 21d, 22a to 2 by eight magneto-optical heads
2d is erased by the erasing means 49b, which irradiates the recording area with a strong laser beam spot light from each of the eight magneto-optical heads, heats the irradiated area to a critical temperature or higher, and then irradiates it during the cooling process. The portion receives the downward erasing magnetic field to align the downward magnetization direction.

In this way, the recording areas 21a to 21d, 22a to 22
When the erase operation of d is completed, the magnet 29.35.4L4
The direction of the current flowing through the magnet switching circuit 30.36.42
．． 48 to switch in the opposite direction, magneto-optical disk 21.2
2, apply an upward recording magnetic field.

With the recording magnetic field applied, the recording/reproducing means 49a supplies recording signals to the eight magneto-optical heads, and the eight magneto-optical heads each record signals in the eight recording areas in response to the signal bit "1". Irradiate spot light. Next, the irradiated portion is heated to a temperature higher than a critical temperature, and during this cooling process, the upward magnetization direction is imparted to the irradiated portion to perform recording.

On the other hand, the reproducing operation is performed by the recording/reproducing means 49a, in which each of the eight magneto-optical heads irradiates the eight recording areas with weak laser beam spot 7) light, and changes the polarization direction depending on the magnetization direction of the reflected light into the eight recording areas. The magneto-optical head reads the signals, and the recording/reproducing means 49a synthesizes and reproduces each signal.

In this way, the recording/reproducing means 49a using eight magneto-optical heads allocates recording signals to the eight recording areas, and in order to synthesize and reproduce each signal from the eight recording areas, it uses two conventional optical heads. It is possible to record and reproduce high-quality color images with a transfer rate that is four times faster than standard transfer rate recording and reproduction using a magnetic head.

Incidentally, each of the recording areas of the magneto-optical disk 2L22 is
Since the recording area of one recording area is 2 smaller than before, the recording and playback time is 2 times smaller than the standard transfer rate.
It is shortened to .

On the other hand, in the above embodiment, recording and reproduction with a transfer rate four times faster has been described, but recording and reproduction at twice the conventional transfer rate or recording and reproduction at the same transfer rate as before can also be performed as is. Can be done.

In other words, when recording and reproducing at a transfer rate twice that of the conventional method, each of the two magneto-optical disks is divided into two, an outer area and an inner area, and a total of four areas are used. Also, the magneto-optical heads 26a and 38a in FIG.
is used as the outer erasing/reproducing head, and the magneto-optical head 213
b and 38b are used as inner-circle erasing/reproducing heads, magneto-optical heads 32a and 44a are used as outer-circumference recording/reproducing heads, and magneto-optical heads 32b and 44b are used as inner-circumference recording/reproducing heads. . Further, the magnet switching circuit 30.42 causes the electromagnet 29.41 to apply a downward erasing magnetic field to each recording area of the two magneto-optical disks, and at the same time, the magnet switching circuit 36.48 causes the electromagnet 35.47 to apply an upward erasing magnetic field to each recording area of the two magneto-optical disks. A magnetic field is applied to the magneto-optical disk, and recording and reproduction are performed in the same manner as before. At that time, the recording/reproducing means 49
a distributes the signal into four areas and records it, and four areas?
, the signals from the Jl region are synthesized and reproduced. This results in
The transfer rate is twice that of the conventional method, and the recording time is the same as that of the conventional method.

When recording and reproducing at the same transfer rate as before, each of the two magneto-optical disks is divided into an outer area and an inner area, and the correspondence between the magneto-optical head and the recording area is determined as described above. At the same transfer rate as that of the conventional method, recording and reproduction are first performed on the outer and inner areas of one magneto-optical disk, and after that is completed, the outer area of the other magneto-optical disk is read and recorded. , performs recording/reproduction on the inner circumference side area. That is, the magnet switching circuit 30 causes the electromagnet 29 to apply a downward erasing magnetic field to each recording area of one magneto-optical disk, and the magnet switching circuit 36 causes the electromagnet 35 to apply an upward recording magnetic field to each recording area of one magneto-optical disk. Recording and playback are performed in the same manner as before. After this recording/reproduction is completed, the magnet switching circuit 4
2, the electromagnet 41 applies a downward erasing magnetic field to each recording area of the other magneto-optical disk, and the magnet switching circuit 48 causes the electromagnet 47 to apply an upward recording magnetic field to the other optical Ci1 disk. Recording and playback are performed in the same manner. Therefore, the transfer rate is the same as before, and the recording time is twice as long as before.

Regarding the difference between the same transfer rate as the conventional transfer rate, the transfer rate twice the conventional transfer rate, and the four times the transfer rate of this embodiment, the same transfer rate as the conventional transfer rate and the transfer rate twice the conventional transfer rate can be overlapped. However, since the transfer rate of 4 times cannot be repeated, the magneto-optical disk must be erased before recording, but a common device can be used by switching between these three modes. For example, 4:'2:2 component signal (color high quality,
4 times the transfer rate), it is possible to efficiently record and reproduce these 13 numbers with one system.

According to the above embodiment, in the correspondence between the divided recording areas and the magneto-optical heads, each magneto-optical head is associated with a respective recording area as shown in FIG. By moving the slider, the magneto-optical Radar 26a,
38a to the second recording area 21b, 22b from the outer periphery,
The magneto-optical helads 26b and 38b are placed in the innermost recording area 21d.
, 22d, the magneto-optical heads 32a, 44a are placed in the outermost recording H1 areas 21a, 22a, and the magneto-optical heads 32b,
44b may be associated with the third recording areas 21c and 22c from the outer periphery.

〔Effect of the invention〕

According to the present invention described above, a total of eight recording areas are provided from two magneto-optical disks each having a recording area divided into four, and correspondingly eight recording/reproducing means are provided using eight magneto-optical heads. Because the signals are distributed to the recording areas for recording and the signals from the eight recording areas are combined and reproduced, it is possible to record and reproduce at four times the transfer rate of conventional devices, which was not possible with conventional devices. :2:2 component signals can be recorded and played back.

Further, the present invention is not limited to use in recording images, but can also be used in other fields of recording, such as high-speed transfer rate storage devices for computers, for example. It can also be used as a single device.

[Brief explanation of the drawing]

FIG. 1 is a schematic side view of a magneto-optical disk recording device according to an embodiment of the present invention. FIG. 2 is a top view of two magneto-optical disks used in the present invention, showing how the recording areas are divided. FIG. 3 is a top view of a conventional magneto-optical disk. FIG. 4 is a schematic top view of a conventional magneto-optical disk recording device. [Explanation of symbols of main parts]

Claims (2)

[Claims] (1) Two magneto-optical disks whose recording area is divided into four in the radial direction from the outer circumference to the inner circumference, and these recording areas are formed; Eight magneto-optical heads that perform recording, reproduction and erasing in correspondence with each other; Via the eight magneto-optical heads, signals are distributed and recorded in the eight recording areas, and each of the eight recording areas is What is claimed is: 1. A magneto-optical disk recording device comprising: a recording/reproducing means for synthesizing and reproducing signals; (2) For each of the magneto-optical disks, two slider mechanisms are arranged facing each other across the rotation center of the magneto-optical disk, and two of the magneto-optical heads are mounted on each slider mechanism, and the magneto-optical heads are mounted on each slider mechanism. One magneto-optical head mounted on one slider corresponds to the outermost recording area of the magneto-optical disk, and the other magneto-optical head corresponds to the outermost recording area of the magneto-optical disk.
One magneto-optical head mounted on the other slider corresponds to the second recording area from the outer circumference, and the other magneto-optical head corresponds to the innermost recording area. A magneto-optical disk recording device according to claim 1, characterized in that: