JPH0296955A - Magneto-optical recorder - Google Patents

Abstract

PURPOSE:To reduce the size and weight of a magneto-optical recorder as a whole and to improve operating speed of the recorder by supporting a magnetic yoke section for impressing a bias magnetic field upon a magnetic recording medium by a driving section which rotates the yoke section and simply constituting a bias magnet and its moving device. CONSTITUTION:At a bias magnet device 117 a magnetic yoke 112 molded to an L-shape is rotatably supported by a bearing member 113 and rotated by a motor 115. A stopper 116 which is brought into contact with the rectangular section of the yoke 112 and stops the yoke 112 at a prescribed position is provided to the bearing member 113 and, when the yoke 112 is brought into contact with the stopper 116, a sensor detects the contact and locks the motor 115 after stopping the rotation. Loading of a cartridge 102 is started when the yoke 112 starts to move and the cartridge 102 descends. When the cartridge 102 descends completely, the yoke 112 rotates from a position 118 to another position 119. After the disk in the cartridge is clamped 33 to a turntable 6, the yoke 112 is stopped at a position apart from the disk by a prescribed distance.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a magneto-optical recording device that records information on a magneto-optical recording medium, which is an information recording medium, by cooperating a light beam and a magnetic field. Regarding.

Note that the magneto-optical recording medium may take various forms such as a disk-like shape and a card-like form, but the explanation will be given below using a disk-shaped magneto-optical recording medium (hereinafter referred to as a magneto-optical disk) as an example.

[Conventional technology]

A magneto-optical disk is formed by forming a magnetic thin film having 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, and while a bias magnetic field in the opposite direction to the magnetization direction is applied to the magnetic thin film, information (a radar beam digitally modulated according to No. 4) is recorded. Then, the temperature of the area irradiated by the radar beam increases and the coercive force decreases.
Under the influence of the bias magnetic field, it is magnetized in the opposite direction to the surroundings, forming a magnetization pattern according to 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, recorded information can also be erased by applying a magnetic field in the opposite direction to the bias magnetic field during recording.

FIG. 5 is a schematic cross-sectional view showing a conventional magneto-optical recording device using the above magneto-optical disk. Here, an upper cover 42 is attached to the device frame 41, and the magneto-optical disk 4
It is opened and closed when attaching and detaching item 3.

This magneto-optical disk 43 is flanged to a turntable 44 by a flange 48, and is rotated by a spindle motor within a head frame 45.

The optical head 46 moves in the radial direction of the disk along the guide 491C and records information by irradiating the magneto-optical disk 43 with a light beam. Further, a magnet 47 for applying a bias magnetic field is provided integrally with the dot 46 and moves in the radial direction together with the dot 46 towards the light.

In such a configuration, the magnet 47 can be small, but the optical spatula 46, which is the movable part, becomes large and has the problem of not being able to handle high-speed access. Figure 6 shows the conventional magneto-optical 5 is a schematic cross-sectional view showing another example of the configuration of the recording device, in which the same members as in FIG. 5 are denoted by the same reference numerals;
Detailed explanation will be omitted. In this example, the bias magnet 47
has a size that covers the recording area in the radial direction of the magneto-optical disk 430, and is fixed to the upper lid 42 of the device.

With the top lid closed, the bias magnet 47 approaches the magneto-optical disk 43 as shown by the broken line. Although this example has a single configuration as described above, nine problems arose when the applicable devices were limited to those with an openable and closable upper lid. This problem of attaching and detaching media is extremely important when considering systemization with other information devices.
! For example, as a substitute for the magnetic F4 disk, the above-described device could not be used because of the limitations on the height of the installation space and the need for an opening/closing space of 7 ta.

FIGS. 7(a) and 7(b) are 91Ifi cross-sectional views of other conventional examples.

Figure 7 (-) shows a state in which the disk cartridge has not started descending during loading.
b) is when rotation and flanging are completed.

First, explanation will be given based on FIG. 7 (&). Roughly speaking, 1 is the spindle motor unit, 2 is the bias magnet unit, 3 is the clamp unit, and 4 is the frame. The spindle motor unit 1 is slidable on the spindle motor 5, the turntable 6 fixed to the rotation axis of the spindle motor 5, and the rotation axis of the spindle motor, and is always lifted upward by elastic force. Qi 9 cone 7
Consists of.

The bias magnet unit 2 includes a parallel link mechanism including a bias magnet 8, a first link plate 9, a second link plate 10°, a third link plate 11, and a coupling plate 12 shown in FIG. 7(b), and a slider 13 as a movable part. It consists of Further, an inner guide 14 and an outer guide 15 forming a fixed part are provided on both sides of the bias magnet.

In the bias magnet drive unit, a lever 17 rotates around a pin 16 fixed to the frame 4 by a drive mechanism (not shown), and engages with this lever 17 to move a pin 18 fixed to the slider 13. Okay, drive the bias magnet. One end of the first link plate 9 and the second link plate lO is connected to the coupling plate 1
2, and the other end is rotatably connected to the third link plate 11. In addition, a rotating shaft fixed to the slider 13 passes through the center of the first link plate 9 and the second link plate 10, and since the roller 20 fitted in this rotating shaft 19 moves along the inner foid 14, The slider 13 moves linearly.

A roller 21 is provided at the joint between the first slide plate 9 and the third link plate 11 (7), and this roller 21 is connected to the torsion panel 22.
and is pressed against the outer guide 15 by the gravity of the bias magnet 8.

The clamp unit 3 is composed of a fourth link plate 31, a fifth link plate 32, a clamp base 33, and a clamp guide 34.

One end of the fourth slide plate 31 is rotatably connected to the club 7 guide 34, and the other end to the center of the fifth link plate 32. One end of the fifth link plate 32 is a clan/f33
The other end is movable in the direction of the arrow in FIG. 7(A).

By driving this portion, the shift clamper 33 moves up and down, and it becomes possible to release the disc katakari horn 102 from hitting the turntable 6 as shown by solid lines and broken lines. In the loading process, the disk cartridge 102 is first moved in the horizontal direction, and when the center of the disk is located approximately at the center of the turntable 6, it begins to descend. Almost simultaneously with the descent of the disc cartridge 102, the Kuratsuno 33 begins to descend, and immediately after the disc is placed on the turntable 6, the Kuratsuno? 33 places the disc on the turntable 6. The movement of the bias magnet 8 is started after the loading is completed.

Although it is possible to perform the disc rotation after loading is completed, the procedure described above allows the rotation of the disc to start while the bias magnet 8 is moving, so operations such as recording and playback can be performed from the start of loading. You can shorten the time it takes to enter.

The slider 13 moves along the inner guide 14, but since the roller 21 moves along the shape of the outer guide 15, when the roller 21 approaches the slope 15-1 of the outer guide 15,
The position of the roller 21 rises, and accordingly the bias magnet 8
begins to descend and enters the opening of the disk cartridge 102) and stops at the position shown in FIG. 7(b).

The electromagnet is driven by a bin 18 fixed to the slider 13,
Length F that rotates around the bin 16 and engages with the bin 18:
This is carried out by a motor (not shown) or the like using a lever 17 having a diameter as a transmission means.

[Problem to be solved by the invention]

However, the conventional example described above has the following problems.

That is, in the conventional example shown in FIG. 5, a bias magnetic field is applied. The magnet is provided integrally with the optical head and moves in the radial direction of the disk medium together with the optical head. For this reason, although the magnet can be small, the magnet becomes large and NJJK to the light, which is the movable part, and has the drawback that it cannot support high-speed access.

In the conventional example shown in FIG. 6, the bias magnet is fixed to the upper vine of the device. For this reason, there are nine problems when the applicable devices are limited to those with top vines that can be opened and closed. This problem of mounting and removing media is very important when considering systemization with other information devices. However, it was not possible to use the above-mentioned device, which required a space between the opening and closing walls of the upper ivy.

In the conventional example shown in FIGS. 7(a) and 7(b), the magneto-optical recording medium can be inserted smoothly by providing a mechanism that moves the bias magnet away from the insertion path when the magneto-optical recording medium is inserted. The configuration of sliders, parallel links, rollers, etc. is complicated, making it difficult to downsize, and j! There is a problem that it becomes a foothills.

〔the purpose〕

The present invention has been made in view of the problems of the prior art described above, and its purpose is to reduce the installation space and to improve
The object of the present invention is to provide a magneto-optical recording device that is systematized with equipment.

[Means to solve the problem]

According to the present invention, the above object is achieved in a magneto-optical recording device that records a large amount of information by bringing a part of a magnetic yoke close to each other for applying a bias magnetic field to a magneto-optical recording medium and irradiating a light beam. , the magneto-optical recording medium is inserted along a surface direction substantially parallel to the recording surface of the medium during flanging, and the magnetic yoke portion rotates around an imaginary axis located substantially parallel to the surface direction. When the recording medium is inserted, a portion of the magnetic yoke portion rotates in a direction away from the insertion path, and when the recording medium is inserted, a portion of the magnetic yoke portion rotates away from the insertion path. This is accomplished by a magneto-optical recording device, which is adapted to rotate in a direction approaching n.
Ru.

[Effect]

In the magneto-optical recording device of the present invention having the above means, when a magneto-optical recording medium is inserted, the drive unit of the magnetic yoke rotates the magnetic yoke and deviates from the insertion path. It has the function of preventing the media from colliding, and after the completion of insertion of the magneto-optical recording medium, the outgoing yoke rotates and allows the magnetic yoke to be installed at a position close to the magneto-optical recording medium.

〔Example〕

Embodiments of the present invention will be described in detail below with reference to the drawings.

FIGS. 1(1) and 1(b) are side VFR views showing the first embodiment of the magneto-optical recording device of the present invention, and FIG. 1(c)
is a sectional view of FIG. 1(b) viewed from the left side.

Note that FIG. 1 (A) shows a state in which the disk cartridge 102 has not started lowering in the middle of loading, and FIG. It shows the end of the child's life.

In the figure, numeral 102 is an f-isk cartridge that houses a magneto-optical f-4 disk 111 therein.

In the non-embodiment, a rectangular magnetic yoke 112 is rotatably supported by a bearing 113.

A coil 114 for generating a bias magnetic field is wound around this magnetic yoke 112. Furthermore, in order to rotationally drive this magnetic yoke, a motor 115 that can freely rotate forward or reverse is provided in this embodiment.

Roughly speaking, 1 is the spindle motor unit;
17 is a bias magnet unit, 3 is a clamp unit,
4 is a frame body. The spindle motor unit 1 includes a spindle motor 5, a turntable 6 fixed to the rotating shaft of the spindle motor 5, and a tapered cone 7 that is slidable on the rotating shaft of the spindle motor and is lifted upwardly by elastic force. Become.

The clamp unit 3 includes a first link plate 31, a second link plate 32, a clamp/'P 33, and a clamp guide 34. One end of the first link plate 31 is rotatably connected to the club 7 guide 34, and the other end to the center of the second link plate 32. One end of the second link plate 32 is rotatably connected to the clamper 33, and the other end is connected to the clamper 33 as shown in FIG.
) It is possible to move in the direction of the arrow inside. By driving this part, the disk cartridge 33 moves up and down, making it possible to clamp the disk cartridge to the turntable 6 and release it, as shown by the solid and broken lines. In the loading process, first, the disk cartridge and the rotor 102 are moved in the horizontal direction, and when the center of the disk is located approximately at the center of the turntable 6, the lowering starts. The descent of the disk cartridge and SO 102 is t'! 'At the same time, clan 433 begins to descend, and the disc moves to turntable 6.
Immediately after the disc is placed on the turntable 6, the clapper 33 clamps the disc to the turntable 6.

The bias magnet 117 has an L-shaped magnetic yoke 112 rotatably supported by a bearing member 113, and is rotationally driven by a motor 115.

A coil 114 is wound around the magnetic yoke 112 to generate a bias magnetic field. The magnetic yoke 112 and the motor 115 are connected to a no-ind member (not shown) to prevent the bias magnetic field generated by the coil 114 from flowing toward the motor.
For example, it is made of epoxy resin, polycargonate, ABS, other resins, or non-magnetic material such as aluminum.

The bearing member 113 is provided with a stop 1116 that stops the magnetic yoke 112 at a predetermined position by hitting the rectangular portion of the magnetic yoke 112 that has rotated, and a sensor (not shown) is provided on this stopper. When the magnetic yoke 112 contacts the magnetic yoke 112, the rotation of the motor 115 is stopped and the magnetic yoke 112 is moved to that position.

The movement of the bias magnet 112 starts as soon as loading starts and the disk cartridge 102 starts to descend.
The magnetic yoke 112 begins to rotate from the position 18 to the position 119.

The disc is placed on the turntable 6, and the clamp 43
3 clamps the disk to the turntable 6, the magnetic yoke 112 is configured to stop at a position approximately 0.5 to 2 mm away from the disk.

In this way, in the above embodiment, the magnetic field generating means is configured to be moved above the medium insertion path, and the device can also be made very thin.

Further, as can be seen from the drawings, the above embodiment has a very simple device configuration, and as a result, the cost of the entire device can be reduced.

Next, another embodiment according to the invention will be described.

The present invention can be modified in various ways other than the embodiments described above, and the present invention includes such modifications as long as they do not depart from the scope of the claims.

For example, in this embodiment, the magnetic yoke is directly driven by a motor and positioned at y/4; May be used.

In this embodiment, the timing of the movement of the bias magnet started at the same time as the rotation, but for example, a shutter is provided in the disk cartridge, and the recording surface of the disk is exposed by opening and closing the shutter. In the case of the embodiment, the bias magnet may be moved after the shutter is opened, or the movement of the bias magnet may be started after rotation is completed.

The bias magnet may be freely supported in rotation by directly fixing it to the motor shaft without using a bearing.

The method of winding the coil is not limited to winding around the outer periphery of the magnetic yoke, and the number of coils may be one or more and is not particularly limited. For example, as shown in Figure 2, the magnetic yoke may be branched into two or more parts (three in this example), or
A magnetic yoke may be formed as shown in Fig. M3, and coils may be provided at both ends of the magnetic yoke. The direction of rotation of the magnetic yoke is also not particularly limited.

As shown in FIG. 4, a coil may be wound at one or more locations on the surface of the magnetic yoke opposite to the surface facing the disk.

Further, the yoke shape is not limited to the L-shape, but may be rectangular, rectangular, or the like.

Incidentally, the above-mentioned FIGS. 2, 3, and 4 are fP+ views of the magnetic yoke showing other embodiments of the misfire 1 man.

〔Effect of the invention〕

As explained above, according to the present invention, the magnetic yoke section for applying a bias magnetic field to the optical 4iB recording medium is supported by the drive section that rotates the yoke section, thereby achieving There is no need to shift the bias magnet up and down in parallel, the bias magnet and its moving means can be easily configured, and the entire device can be made smaller and lighter, and the operation speed can be increased. Become.

Furthermore, the magneto-optical recording medium can be inserted smoothly. In addition, the loading and unloading of magneto-optical recording media is carried out at 9
Since it can be installed from the front of the panel, the installation space is small and the space can be used effectively.

[BRIEF DESCRIPTION OF THE DRAWINGS] FIGS. 1(a) and 1(b) are side sectional views showing a first embodiment of the magneto-optical recording device of the present invention, and FIG.
Cross-sectional view when viewed from the left side, Figures 2, 3, and 4
The figure is a general view of a magnetic yoke showing another embodiment of the present invention, FIGS. 5 and 6 are schematic sectional views showing a conventional magneto-optical recording table wt, and FIGS. 7(a) and (b). 1 is a schematic cross-sectional view showing another conventional example of a magneto-optical recording device. 112: ia show 1113111 reception, 114: coil, 115: motor, 116: strike, no 9゜Figure 1 (
b) 1st, u (C) Figure R3 R3

Claims (1)

[Claims] (1) In a magneto-optical recording device that records information by bringing a part of a magnetic yoke close to each other for applying a bias magnetic field to a magneto-optical recording medium and irradiating a light beam, the magneto-optical recording medium is clamped. The magnetic yoke is rotatably supported around an imaginary axis located substantially parallel to the surface direction, and the magnetic yoke portion is rotatably supported around an imaginary axis substantially parallel to the surface direction. When a medium is inserted, a portion of the magnetic yoke portion rotates in a direction away from the insertion path, and when the recording medium is clamped, a portion of the magnetic yoke portion rotates in a direction closer to the medium. Magneto-optical recording device.