JPH1166657A - Magneto-optical disk drive device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To permit applying accurately a required magnetic field to an aimed point with low power consumption, to miniaturize a device, and to reduce a price by providing a bias magnetic field applying device which can be moved at less in a vertical direction to a plane of the magneto-optical recording medium so that desired bias magnetic field is applied to the magneto-optical recording medium corresponding to a kind of the magneto-optical recording medium. SOLUTION: When disk cartridges 36, 38 in which magneto-optical disks 32, 34 of different kinds are stored are inserted, a bias magnetic field applying device 46 is energized and fixed to an upper plane case 74 or an upper plate 48 of a disk cartridge 36 through an engaging piece 64 of a yoke holding plate 58. Thereby, the bias magnetic field applying device 46 can be movement- controlled in the vertical direction so that the magneto-optical disks 32, 34 and a center yoke 52 are not absolutely contacted and its distance becomes the shortest distance D1, D2 a required magnetic field can be applied accurately to an aimed point with low power consumption independently of kinds of the magneto-optical disks 32, 34.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of, for example, recording or erasing information on a magneto-optical recording medium, the method comprising: The present invention relates to a magneto-optical disk drive capable of applying a magnetic field.

[0002]

2. Description of the Related Art Conventionally, as this type of apparatus, as shown in, for example, JP-A-8-138261, and as shown in FIGS. 12 and 13 below, different types of magneto-optical recording media, that is, magneto-optical disks are selected. 2. Description of the Related Art A magneto-optical disk drive device including two objective lenses that can be used in a known manner is known.

That is, in each device, the aberration is reduced to an allowable value or less according to the type of the magneto-optical disk (for example, when the thickness of the cover glass of the disk differs depending on the type of the disk to be used). It is configured so that the reduced information can be recorded, reproduced and erased.

[0004] Here, as an example, FIG. 12 and FIG.
The magneto-optical disk drive shown in FIG. As shown in FIGS. 12 and 13, an optical pickup 4 slidable along a pair of guide shafts 2 extending in the X direction, that is, in the radial direction of the magneto-optical disks 8 and 10, and the optical pickup 4 A magneto-optical disk drive device having a magnetic circuit 6 provided on both sides is known.

In order to selectively use the optical pickup 4 corresponding to the magneto-optical disks 8 and 10 having different cover glass thicknesses t 1 and t 2, these magneto-optical disks 8 and 10 are used.
Two objective lenses 12 which are arranged at positions where the optical paths do not overlap each other in the tangential direction of ten tracks (not shown) are mounted. That is, by selectively using the two objective lenses 12, the objective lens 12 is transmitted from the laser light source 14 through the lens 16 and the reflection mirror 18.
Can be focused on recording layers (not shown) of the magneto-optical disks 8 and 10 with an aberration equal to or less than an allowable value.

Each of the magnetic circuits 6 includes an inner yoke 20 extending in the X direction, an outer yoke 22 opposed to the inner yoke 20, and a metal short ring 24 wound around the inner yoke 20. , This metal short ring 2
A tracking coil 26 wound around the outer periphery of the outer yoke 2 and the outer yoke 2
2 provided with the magnet 28.

[0007] According to such a configuration, the electromagnetic action between the magnet 28 and the tracking coil 26 generated when a predetermined current flows through the tracking coil 26 causes the optical pickup 4 to slide in the X direction while causing the optical pickup 4 to slide in the X direction. Recording, reproduction and erasure of information on the magnetic disks 8 and 10 can be performed.

[0008]

These magneto-optical disk drive devices are both magneto-optical disks dedicated to information reproduction,
Alternatively, when using a phase change type magneto-optical disk that does not require a bias magnetic field when recording or erasing information,
There is no particular problem.

However, when a magneto-optical disk that requires a bias magnetic field when recording or erasing information is used, the following problems occur. That is, as shown in FIG. 13, the cover glass thicknesses t1 and t2 (t1 <t2).
When two types of magneto-optical disks 8 and 10 differing from each other are selectively set in the magneto-optical disk drive, respectively, from the recording layer to the bias magnetic field applying device 30 corresponding to the set magneto-optical disks 8 and 10 Distance L1, L2
(L1> L2) is different.

The magnetic field generated from the bias magnetic field applying device 30 decreases in inverse proportion to the square of the distance along the generation direction. In this case, assuming that the bias magnetic field applying device 30 is designed to generate a required magnetic field in the recording layer of the magneto-optical disk 10 having the thickness t2, the magneto-optical device having the thickness t1 (<t2) is required. The magnetic field applied to the recording layer of the disk 8 greatly decreases in inverse proportion to the square of the distance difference (L1-L2). For this reason, there is a problem that it is difficult to record information accurately.

In order to solve such a problem, a strong magnetic field is generated so as to apply a magnetic field of a certain level or more to the magneto-optical disks 8 and 10 of different types (thicknesses t1 and t2). And a bias magnetic field applying device 30 that can perform the operation.

However, when generating a strong magnetic field, it is necessary to increase the capacity of the magnetic circuit 6 and increase the voltage of the power supply so that a large current flows through the magnetic circuit 6. There is a problem in that the size of the configuration is increased, the manufacturing cost is increased, and the power consumption is also increased. Furthermore, since the amount of heat generated also increases as the power consumption increases, a structure for preventing the heat from affecting the optical pickup 4 and the peripheral structure is also required separately.

Further, since two objective lenses 12 are used, the position where the laser light emitted from each objective lens 12 connects a spot on the magneto-optical disks 8 and 10 is perpendicular to the magneto-optical disks 8 and 10. Not only that, but also in a plane parallel to the magneto-optical disk surface (not shown). Therefore, it is extremely difficult to always accurately apply a required magnetic field to each spot position on the magneto-optical disks 8 and 10 by using one bias magnetic field applying device 30.

The present invention has been made to solve such a problem, and an object of the present invention is to apply a required magnetic field accurately to a target portion with low power consumption regardless of the type of a magneto-optical recording medium. It is an object of the present invention to provide a compact and low-priced magneto-optical disk drive capable of performing the above-mentioned operations.

[0015]

In order to achieve the above object, a magneto-optical disk drive according to the present invention provides a desired bias for a magneto-optical recording medium in accordance with the type of the magneto-optical recording medium. There is provided a bias magnetic field applying device configured to be movable at least in a direction perpendicular to the surface of the magneto-optical recording medium so as to apply a magnetic field.

Further, the magneto-optical disk drive of the present invention can be applied to a surface of a magneto-optical recording medium such that a desired bias magnetic field is applied to the magneto-optical recording medium in accordance with the type of the magneto-optical recording medium. A bias magnetic field applying device configured to be movable in a vertical direction and a tangential direction of an information track of the magneto-optical recording medium.

Further, according to the magneto-optical disk drive of the present invention, the surface of the magneto-optical recording medium is applied so that a desired bias magnetic field is applied to the magneto-optical recording medium in accordance with the type of the magneto-optical recording medium. A bias magnetic field applying device having a center yoke configured to be movable in a vertical direction and a tangential direction of an information track of the magneto-optical recording medium.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a magneto-optical disk drive according to a first embodiment of the present invention will be described with reference to FIGS.
This will be described with reference to FIG. As shown in FIG. 1A, the magneto-optical disk drive device of the present embodiment includes disk cartridges 36 and 38 (FIGS. 3 and 4) accommodating different types of magneto-optical recording media, that is, magneto-optical disks 32 and 34. The drive device main body 40 is provided with an opening 40a having a size capable of inserting and removing the same.

The drive unit body 40 has an opening 4
Disk cartridge 3 selectively inserted from 0a
Cartridge holder 42 capable of holding the cartridges 6 and 38, and the disc cartridges 36 and 3 inserted through the opening 40a.
8 is loaded into the cartridge holder 42, and the spindle motor 44
Is lifted in the direction of the magneto-optical disks 32 and 34 to thereby magnetically attract and hold the magneto-optical disks 32 and 34 on a turntable (not shown) of the spindle motor 44 (see JP-A-9-7348). ), A bias magnetic field applying device 46 provided above the cartridge holder 42 so as to apply a predetermined bias magnetic field to the magneto-optical disks 32 and 34 held by the cartridge holder 42, An optical pickup (not shown) disposed opposite to the bias magnetic field applying device 46 is incorporated. The optical pickup is a magneto-optical disk 32, 3
4 so as to be movable in the radial direction.

The cartridge holder 42 includes an upper plate 48,
A lower plate 50 is provided, and a bias magnetic field applying device 46 can be attached to the upper plate 48.

As shown in FIGS. 1 and 2, the bias magnetic field applying device 46 is disposed so as to surround a center yoke 52, a coil 54 wound around the center yoke 52, and the coil 54. A side yoke 56 and a yoke support plate 58 that supports the center yoke 52 and the side yoke 56 are provided. In FIG. 2, the center yoke 52 and the side yokes 56 are omitted, and the coils 5
Only 4 was shown.

Center yoke 52 and side yoke 56
The yoke support plate 58 is formed of a magnetic material such as pure iron such as electromagnetic soft iron or an iron-based alloy such as Si-Fe or Ni-Fe. A copper wire is wound by a predetermined amount so as to generate a DC bias magnetic field in the direction perpendicular to the surfaces of the magneto-optical disks 32 and 34, and is fixed to the center yoke 52 by an adhesive or the like.

The yoke support plate 58 is provided for the center yoke 52.
Extends a predetermined amount in a direction perpendicular to the longitudinal direction of the
A cartridge holder 42 is provided on each side of the extension end.
The bent part 60 bent in the direction is formed. Specifically, each of the bent portions 60 is provided with a corresponding one of the yoke support plates 5.
8 are formed at the four corners, and a bent portion 60 is provided with a stopper portion 62 and an engagement piece 64 protruding from the stopper portion 62, respectively, which will be described later.

On the other hand, the upper plate 48 of the cartridge holder 42
, An engagement hole 66 is formed at a position opposed to the four bent portions 60 so that the engagement piece 64 can be engaged with the stopper portion 62 and cannot be inserted therethrough.

The upper plate 48 is provided with the coil 54 so that the center yoke 52 and the side yoke 56 around which the coil 54 is wound face the magneto-optical disks 32 and 34 held by the cartridge holder 42 directly. An insertion hole 68 having a size that allows the wound center yoke 52 and side yoke 56 to be inserted is formed.

When the engagement piece 64 is engaged with the engagement hole 66, the position of the yoke support plate 58 in the direction parallel to the upper plate 48 (left and right direction and depth direction in FIG. 2) is determined. When
The center yoke 52 is positioned so that its longitudinal direction matches the radial direction of the magneto-optical disks 32 and 34 held by the cartridge holder 42.

At the center of the extended end of the yoke support plate 58, engagement projections 70 are provided, respectively, and one end of a biasing spring 72 is engaged with these engagement projections 70. The other end of the biasing spring 72 is fixed to a fixing portion (not shown) provided in the drive device main body 40.

According to such a configuration, the yoke support plate 5
8 is movable in the height direction with respect to the upper plate 48,
The yoke support plate 58 is urged downward in FIG. 2 by an urging spring 72, and the engagement pieces 64 of the yoke support plate 58 are inserted into the engagement holes 66 of the upper plate 48, respectively. Is held by the cartridge holder 42 in a state where the lowermost position in the height direction is determined.

As shown in FIGS. 3 and 4, the disk cartridges 36 and 38 are roughly classified into two types. One type is the thickness of the cover glass (not shown) of the magneto-optical disk 32. 90 mm (128 MB, 23 MB) conforming to the ISO standard
0 MB, 540 MB, and 640 MB) (see FIG. 3), and in other types, the cover glass (not shown) of the magneto-optical disk 34 has a thickness of 0.
The 90 mm disk cartridge 38 is 6 mm and has a larger storage capacity than the magneto-optical disk 32 (see FIG. 4).

High capacity type disk cartridge 38
Have two recesses 76 on both sides of the upper case 74.
(Approximately 1 to 2 mm), and another sensor hole 82 is provided in parallel with the sensor hole 80 for holding the write protect piece 78 movably between writable / writable. . Except for this, the configuration of both disk cartridges 36 and 38 is the same as that of the disk cartridge 36 conforming to the ISO standard.
The description is omitted.

Next, the operation of this embodiment will be described. In the description of the operation, as an example, a case will be described in which the disk cartridge 36 and the high-capacity type disk cartridge 38 conforming to the above-mentioned ISO standard are selectively loaded into the cartridge holder 42.

Either disk cartridge 36, 38
1A, the stopper 62 of the bent portion 60 of the yoke support plate 58 is in contact with the upper plate 48, as shown in FIG.

First, as shown in FIG. 5A, when the disk cartridge 36 conforming to the ISO standard is inserted against the urging force of the ejection spring 84, the engagement piece 64 of the yoke support plate 58 is used. Is pressed by the upper case 74 of the disk cartridge 36, so that the biasing spring 72
(See FIG. 2)
6 moves vertically upward with respect to the surface of the magneto-optical disk 32. Then, the biasing force of the biasing spring 72 causes the bias magnetic field applying device 46 to operate the disc cartridge 36.
The upper case 74 is biased and fixed. At this time, the loading is completed.

In this moving operation, the distance D1 between the magneto-optical disk 32 and the center yoke 52 is determined in consideration of the surface deviation and the mechanical tolerance of the magneto-optical disk 32. The distance is controlled so as not to make absolute contact and to be the shortest distance.

Next, after the disk cartridge 36 has been extracted, as shown in FIG. 5B, when the high-capacity type disk cartridge 38 is inserted against the urging force of the ejection spring 84, the yoke Since the engagement piece 64 of the support plate 58 enters the recess 76 of the upper case 74,
The engagement piece 64 does not contact the upper case 74. At this time, with the stopper portion 62 of the yoke support plate 58 in contact with the upper plate 48 of the cartridge holder 42, the urging spring 7
By the biasing force of 2, the bias magnetic field applying device 46 is biased and fixed to the upper plate 48. At this time, the loading is completed.

In this moving operation, the distance D2 between the magneto-optical disk 34 and the center yoke 52 is determined in consideration of the surface deviation of the magneto-optical disk 34 and mechanical tolerances. The distance is controlled so as not to make absolute contact and to be the shortest distance.

According to the present embodiment, the bias magnetic field applying device 46 is vertically moved so that the different types of magneto-optical disks 32 and 34 and the center yoke 52 are at a distance where they do not make absolute contact with each other and are the shortest. Since the movement can be controlled, a compact and low-priced magneto-optical disk drive device capable of accurately applying a required magnetic field with low power consumption to a target location regardless of the type of the magneto-optical disks 32 and 34 is provided. Can be provided.

Note that the present invention is not limited to the configuration of the above-described embodiment, and can be variously changed without adding new matter. In the above embodiment, the upper case 74 of the disk cartridges 36, 38
The bias magnetic field applying device 46 is mechanically
Are switched, but other methods may be used. For example, the shape of the leading end on the insertion side of the disc cartridges 36, 38 may be changed, or the shape of the shutter portion 86 (see FIGS. 3 and 4) of the disc cartridges 36, 38 may be changed, so that the shutter at the time of loading is changed. The position of the bias magnetic field applying device 46 may be switched in conjunction with the operation of an opening / closing mechanism (not shown). Also, a sensor hole 82 provided in the upper case 74 is provided.
The presence or absence of (see FIG. 4) may be detected, and the position of the bias magnetic field applying device 46 may be switched based on the detection data. Alternatively, the type of the magneto-optical disks 32 and 34 may be detected, and the position of the bias magnetic field applying device 46 may be switched based on the detected data.

Next, a magneto-optical disk drive according to a second embodiment of the present invention will be described with reference to FIGS. In this embodiment, as in the first embodiment, a case will be described in which a disk cartridge 36 and a high-capacity type disk cartridge 38 conforming to the ISO standard are selectively loaded into the cartridge holder 42.

In the present embodiment, similarly to the configuration shown in FIG. 12, for example, two optical discs 32 and 34 are arranged at positions where their optical paths do not overlap in the tangential direction of tracks (not shown). Objective lenses 88, 90
It is assumed that a magneto-optical disk drive device including an optical pickup on which (see FIG. 7) is mounted.

As shown in FIGS. 6 and 7, in the magneto-optical disk drive of this embodiment, the bias magnetic field applying device 46 is arranged in a direction perpendicular to the surfaces of the magneto-optical disks 32 and 34 and in the direction of the magneto-optical disks 32 and 34. It is configured such that it can be moved in the tangential direction of 34 information tracks.
Since other configurations are the same as those of the first embodiment, the same reference numerals are given and the description thereof is omitted.
In the following description, only the configuration for moving the bias magnetic field applying device 46 in the vertical direction and the tangential direction of the information track will be described.

The bias magnetic field applying device 46 applied to the present embodiment uses a pair of parallel links 92a and 92b constituting a parallel link mechanism to make magneto-optical disks 32 and 34.
Are supported so as to be movable in a direction perpendicular to the surface and in a direction tangential to the information track.

The pair of parallel links 92a, 92b
Are connected at one end to a first support member 94 supporting the bias magnetic field applying device 46 via a support shaft 96, and at the other end to a second support member fixed to the cartridge holder 42. 98 via a central shaft 100.

The first and second support members 94 and 98 include:
The surfaces of the magneto-optical disks 32 and 34 are provided with inclined surfaces 94a and 98a having a predetermined inclination angle θ (see FIG. 7A), and the support shaft 96 and the central axis 100 are first and second. Are mounted on the inclined surfaces 94a and 98a of the support members 94 and 98. FIG. 7 shows the first support member 9.
4 shows only the inclined surface 94a.

A sliding hole 102 is formed at an intermediate portion between the pair of parallel links 92a and 92b, and these sliding holes 102 are provided in the magneto-optical disks 32 and 3 respectively.
Slider 10 slidable in the tangential direction of track 4
4 is inserted through the slider 104 and the working shaft 106 is vertically raised from the slider 104 with respect to the surfaces of the magneto-optical disks 32 and 34. That is, the action shafts 106 fixed to the slider 104 are respectively connected to the pair of parallel links 9.
It is only loosely fitted in the sliding holes 102 of 2a and 92b.

Further, since the tension coil spring 108 pulls the parallel link mechanism as described above, the slider 104 is always in contact with the plunger device 1.
It is attached to ten advancing / retreating rods 112.

In such a configuration, the reciprocating rod 112 of the plunger device 110 is driven to
When the slider 4 is slid, the operating shaft 106 fixed to the slider 104 also slides in the same direction.

In this state, a pair of parallel links 92
Since the sliding holes 102a and 92b are only loosely fitted to the working shaft 106, the pair of parallel links 92
a, 92b is applied with a vertical force along the action axis 106 corresponding to the inclination angle θ of the inclined surfaces 94a, 98a of the first and second support members 94, 98.

In this case, a pair of parallel links 92a, 92
b denotes that one end, that is, the end connected to the first support member 94 via the support shaft 96 moves in the direction perpendicular to the surfaces of the magneto-optical disks 32 and 34, and at the same time, the other end, that is, the center shaft 100. The optical discs 32 and 34 rotate in the tangential direction of the tracks around the ends connected to the second support member 98 via the.

As a result, the bias magnetic field applying device 46 supported by the first support member 94 is
While moving in the direction perpendicular to the surface of the magneto-optical disk 32, it simultaneously moves in the tangential direction of the tracks of the magneto-optical disks 32 and 34.

Next, the operation of this embodiment will be described. First, as shown in FIG. 7 (a), when a disk cartridge 36 (magneto-optical disk 32 having a thickness of 1.2 mm) conforming to the ISO standard is inserted, as shown in FIG. Alternatively, the type of the disk cartridge 36 or the magneto-optical disk 32 is detected electrically or optically. Then, based on the detected data, the reciprocating rod 112 of the plunger device 110 is advanced, and the slider 104 is slid against the tension of the tension coil spring 108.

At this time, the bias magnetic field applying device 46 is moved by the parallel link mechanism in the direction perpendicular to the surface of the magneto-optical disk 32 while simultaneously moving the magneto-optical disk 3.
The second track moves in the tangential direction.

As a result, the bias magnetic field applying device 46
The center yoke 52 is positioned at a position facing the objective lens 90 that is compatible with the magneto-optical disk 32 of the ISO standard. At this time, the loading is completed.

In this moving operation, the distance between the magneto-optical disk 32 and the center yoke 52 is reduced in consideration of the surface deviation and the mechanical tolerance of the magneto-optical disk 32.
The bias magnetic field applying device 46 is set so that the distance between the center yoke 52 and the center yoke 52 is absolutely the shortest.
Is controlled.

On the other hand, as shown in FIG.
High capacity type disk cartridge 38 (thickness 0.6
When the magneto-optical disk 34) is inserted, the type of the disk cartridge 38 or the magneto-optical disk 34 is detected mechanically, electrically, or optically as in the first embodiment. Then, based on the detected data, the retractable rod 112 of the plunger device 110 is retracted, and the slider 1 is moved in accordance with the tensile force of the tension coil spring 108.
Slide 04.

At this time, the bias magnetic field applying device 46 is moved by the parallel link mechanism in the direction perpendicular to the surface of the magneto-optical disk 34 while simultaneously moving the magneto-optical disk 3.
The track 4 moves in the tangential direction. That is, the bias magnetic field applying device 46 moves from a position indicated by a dotted line (an initial position described later) in the drawing to a position indicated by a solid line.

As a result, the center yoke 52 of the bias magnetic field applying device 46 is positioned at a position facing the objective lens 88 which is adapted to the high-capacity magneto-optical disk 34. At this time, the loading is completed.

In this moving operation, the distance between the magneto-optical disk 34 and the center yoke 52 is reduced in consideration of the surface deviation and the mechanical tolerance of the magneto-optical disk 34.
The bias magnetic field applying device 46 is set so that the distance between the center yoke 4 and the center yoke 52 does not make an absolute contact and the shortest distance.
Is controlled.

The disk cartridges 36, 38
However, when not inserted, the bias magnetic field applying device 46 is positioned at the position indicated by the dotted line in FIG. 7B (that is, the initial position) by the tensile force of the tension coil spring 108 acting on the parallel link mechanism. Can be

According to the present embodiment, the bias magnetic field applying device 46 is moved in the vertical and vertical directions so that the different types of magneto-optical disks 32 and 34 and the center yoke 52 are at a distance that does not make absolute contact with each other and are the shortest. Since the movement can be controlled in the tangential direction of the information track, regardless of the type of the magneto-optical disks 32 and 34, it is possible to apply a required magnetic field with low power consumption and accurately at a target location. It is possible to provide a magneto-optical disk drive.

Further, according to the present embodiment, the magneto-optical disks 32 and 34 are provided by the two objective lenses 88 and 90.
Even when spots are formed not only in the direction perpendicular to the surface of the optical disk but also in the tangential direction of the information track, the magneto-optical disk 3
It is possible to always apply the required magnetic field accurately to each spot position on 2, 34.

Next, a magneto-optical disk drive according to a third embodiment of the present invention will be described with reference to FIG. In the description of the present embodiment, the same components as those of the first embodiment are denoted by the same reference numerals, and description thereof will be omitted.

This embodiment is an improvement of the second embodiment, in which the bias magnetic field applying device 46 is moved in a direction perpendicular to the surface of the magneto-optical disk and in a direction tangential to the information tracks of the magneto-optical disk. And when the disk cartridge is inserted into and removed from the cartridge holder 42, the bias magnetic field applying device 46 is evacuated so that the magneto-optical disk does not interfere with or come into contact with the bias magnetic field applying device 46. It is configured to be able to.

Also, in this embodiment, as in the second embodiment, two objective lenses (see FIG. 7) arranged at positions where the optical paths do not overlap each other in the tangential direction of the track of the magneto-optical disk. A magneto-optical disk drive device equipped with an optical pickup mounted is assumed.

Since other configurations are the same as those of the second embodiment, only the different configuration will be described below. As shown in FIGS. 8A and 8B, the bias magnetic field applying device 46 applied to the present embodiment includes:
A shaft 114 extending parallel to the center yoke 52 is attached.

The upper plate 48 of the cartridge holder 42 applied to the present embodiment is provided with a pair of cam plates 116a and 116b which are raised so as to face both sides of the insertion hole 68. The pair of cam plates 11
6a and 116b are juxtaposed along the radial direction of the magneto-optical disk (not shown).

The pair of cam plates 116
a, 116b are respectively provided with cam grooves 118a, 118a,
The shaft 114 is slidably and rotatably engaged with the cam grooves 118a and 118b.

In the plunger device 110 applied to the present embodiment, an engaging projection 120 is attached to the tip of the reciprocating rod 112.
Are the engagement recesses 1 provided in the bias magnetic field applying device 46.
22.

Next, the operation of this embodiment will be described. In the description of the operation of the present embodiment, as in the case of the first embodiment, a case will be described in which a disk cartridge conforming to the ISO standard and a high-capacity type disk cartridge are selectively loaded into the cartridge holder 42.

Further, in this operation description, as one example, one end A, the other end B, and the center end C (FIG. 8A)
) -Shaped cam grooves 118a, 118
Apply b.

When the disc cartridge is not inserted or when the disc cartridge is inserted or removed, the shaft 114 is positioned at the center end C by the reciprocating rod 112 of the plunger device 110. At this time, the bias magnetic field applying device 46 is positioned at a position that does not interfere with or contact the magneto-optical disk (that is, a position furthest away from the surface of the magneto-optical disk). As a result,
It is possible to prevent damage to the magneto-optical disk.

First, when a disk cartridge (a magneto-optical disk having a thickness of 1.2 mm) conforming to the ISO standard is inserted, the type of the disk cartridge or the magneto-optical disk is detected mechanically, electrically or optically. Then, based on the detected data, the plunger device 110
When the reciprocating rod 112 is advanced, the shaft 114 slides along the cam grooves 118a and 118b, so that the bias magnetic field applying device 46 simultaneously moves in the direction perpendicular to the surface of the magneto-optical disk while magneto-optically. Moves tangentially to the tracks on the disc.

When the shaft 114 comes into contact with one end A, the bias magnetic field applying device 46 is positioned at a position where the center yoke 52 faces the objective lens conforming to the ISO standard magneto-optical disk. At this time,
Loading is completed.

In this moving operation, the distance between the magneto-optical disk and the center yoke 52 is determined by taking into consideration the surface deviation and the mechanical tolerance of the magneto-optical disk. And the position of the bias magnetic field applying device 46 is controlled so as to be the shortest distance.

On the other hand, when a high capacity type disk cartridge (a magneto-optical disk having a thickness of 0.6 mm) is inserted, the type of the disk cartridge or the magneto-optical disk is detected mechanically, electrically or optically. I do. Then, based on the detected data, the plunger device 11
When the 0 reciprocating rod 112 is retracted, the shaft 114
Slide along the cam grooves 118a and 118b, the bias magnetic field applying device 46 moves in the direction perpendicular to the surface of the magneto-optical disk and at the same time, moves in the tangential direction of the track of the magneto-optical disk.

When the shaft 114 comes into contact with the other end B, the bias magnetic field applying device 46 is positioned at a position where the center yoke 52 faces the objective lens suitable for a high-capacity magneto-optical disk. At this time, the loading is completed.

In this moving operation, the distance between the magneto-optical disk and the center yoke 52 is determined by taking into account the surface deviation and mechanical tolerance of the magneto-optical disk. And the position of the bias magnetic field applying device 46 is controlled so as to be the shortest distance.

According to the present embodiment, the bias magnetic field applying device 46 is positioned at a position where it does not interfere with or come into contact with the magneto-optical disk (ie, a position furthest away from the surface of the magneto-optical disk), particularly when the disk cartridge is inserted or removed. Therefore, damage to the magneto-optical disk can be prevented. Note that the other effects are the same as those of the second embodiment, and a description thereof will be omitted.

Further, in the present embodiment, as an example, the cam grooves 118a and 118b in the shape of “H” are applied. However, when it is not necessary to retract the bias magnetic field applying device 46, for example, a linear A cam groove may be applied.

Next, a magneto-optical disk drive according to a fourth embodiment of the present invention will be described with reference to FIGS. In the description of the present embodiment, the first
The same reference numerals are given to the same configurations as those of the embodiment, and the description thereof will be omitted.

This embodiment is an improvement of the second embodiment. The surface of the magneto-optical disk and the center yoke 5 correspond to the types of the disk cartridge and the magneto-optical disk.
The distance between the second tip 52a and the second tip 52a can be arbitrarily adjusted.

Also, in the present embodiment, similarly to the second embodiment, two objective lenses (see FIG. 7) arranged at positions where the optical paths do not overlap each other in the tangential direction of the track of the magneto-optical disk. A magneto-optical disk drive device equipped with an optical pickup mounted is assumed.

As shown in FIGS. 9A, 9B and 9C, the bias magnetic field applying device 46 applied to the present embodiment
Has a center yoke 52, a side yoke 56 that rotatably supports the center yoke 52, and a coil 54 provided on the side yoke 56 so as to surround the center yoke 52. When recording and erasing information, the actuator is controlled to rotate in a predetermined direction by a predetermined amount so as to apply a bias magnetic field to a plurality of predetermined locations on the magneto-optical disk.

In such a configuration, by applying a predetermined current to the coil 54, a bias magnetic field can be applied to a predetermined surface of the magneto-optical disk. Further, the side yoke 56 has a notch 124 of a predetermined size which is formed so as to be shifted from the center of the side yoke in the tangential direction of the track of the magneto-optical disk. Support means for rotatably supporting the center yoke 52 are provided to face each other. In addition,
The size of the notch 124 is set to be larger than the size of the center yoke 52.

These supporting means are respectively shown in FIGS.
As shown in FIG. 3C, a support portion 126 is vertically raised outward from the side yoke 56, and a hold hole 128 formed in the support portion 126 is provided. By fitting the protruding shaft portions 130 on both sides of the center yoke 52,
Can be rotatably supported.

The mouth dimension G of the hold hole 128 (FIG. 10)
(C) is designed to be slightly smaller than the diameter of the shaft portion 130 of the center yoke 52, and
8 (that is, the hold hole 128).
After fitting the shaft portion 130 (to enlarge the mouth size G of the shaft), the mouth portion of the hold hole 128 returns to the original mouth size G by its elastic force, so that the shaft portion 130 can be freely rotated into the hold hole 128. Can be held.

The notch 124 formed in the side yoke 56 has a pair of side edges 124a, 124a extending in parallel along the longitudinal direction.
When the center yoke 52, which is rotatably supported via the support means, rotates, the center yoke 52 comes into contact with the side edges 124a, 124a, so that the rotation range M of the center yoke 52 (FIG. 9) (C) can be kept constant.

Here, an actuator for rotating the center yoke 52 will be described with reference to FIG.
As shown in FIG. 11A, in the present embodiment, the bias magnetic field applying device 46 is attached to the cartridge holder 42. Specifically, the caulking holes 132 provided on both sides in the longitudinal direction of the side yoke 56 are caulked and fixed to the cartridge holder 42, so that the bias magnetic field applying device 46 is attached to the cartridge holder 42.

As shown in FIGS. 3A and 3B, the actuator used in the present embodiment has a center yoke 52.
And a plunger device 110 for rotating the center yoke 52 against the pulling force of the pulling coil spring 134.

One end of the tension coil spring 134 is fixed to the support portion 136 of the cartridge holder 42,
The other end is fixed to the upper side of the center of rotation of the center yoke 52, and the center yoke 52 is configured to always contact the side edge 124a.

The plunger device 110 is mounted on the cartridge holder 42. The plunger device 110 is moved by moving the reciprocating rod 112 to directly press the upper part of the center of rotation of the center yoke 52, whereby the tension coil is pulled. The center end 52a of the center yoke 52 can be rotated against the pulling force of the spring 134.

According to such a plunger device 110, the amount and direction of rotation of the tip 52a of the center yoke 52 can be arbitrarily adjusted by controlling the amount of movement of the advance / retreat rod 112.

In this case, since the rotation range of the center yoke 52 is restricted by the pair of side edges 124a, it is possible to accurately limit the location where the bias magnetic field is applied.

According to such a configuration, the side yoke 5
6, a pair of side edges 124a, 124a
Range M of the center yoke 52 defined by
(For example, at the rotational positions indicated by reference numerals Pa and Pb), a distance difference Z occurs in the distance between the tip 52a of the center yoke 52 and the surface of the magneto-optical disk. As a result, the leading end 5 of the center yoke 52 corresponds to the type of the magneto-optical disk.
The distance between 2a and the surface of the magneto-optical disk can be set arbitrarily.

In this embodiment, as in the second embodiment, different types of magneto-optical disk and center yoke 52 are used.
Of the center yoke 52 in the vertical direction and the tangential direction of the information track so that the distance between the center yoke 52 and the end 52a of the center yoke is the distance that does not make absolute contact with the end 52a. Regardless, it is possible to provide a compact and inexpensive magneto-optical disk drive device that can accurately apply a required magnetic field with low power consumption to a target location.

Further, according to the present embodiment, even when a spot is formed by two objective lenses not only in the direction perpendicular to the surface of the magneto-optical disk but also in the tangential direction of the information track, With one bias magnetic field applying device 46, it is possible to always apply a required magnetic field accurately to each spot position on the magneto-optical disk.

[0097]

According to the present invention, regardless of the type of magneto-optical recording medium, a compact and low-cost magneto-optical disk drive capable of accurately applying a required magnetic field to a target portion with low power consumption. Can be provided.

[Brief description of the drawings]

FIG. 1A is a diagram showing a configuration of a magneto-optical disk drive device according to a first embodiment of the present invention, and FIG.
The figure which shows the structure of a bias magnetic field application apparatus.

FIG. 2 is an exploded perspective view showing a configuration of a cartridge holder and a bias magnetic field applying device.

3A is a perspective view of a disk cartridge conforming to the ISO standard, and FIG. 3B is a plan view thereof.

4A is a perspective view of a high capacity type disk cartridge, and FIG. 4B is a plan view thereof.

FIG. 5A is an operation explanatory diagram when a disk cartridge conforming to the ISO standard is inserted, and FIG. 5B is an operation explanatory diagram when a high-capacity type disk cartridge is inserted.

FIG. 6 is a diagram showing a main configuration of a magneto-optical disk drive according to a second embodiment of the present invention.

FIG. 7A is an operation explanatory diagram when a disk cartridge conforming to the ISO standard is inserted, and FIG. 7B is an operation explanatory diagram when a high-capacity type disk cartridge is inserted;

FIG. 8 is a diagram illustrating a main configuration of a magneto-optical disk drive device according to a third embodiment of the present invention;
FIG. 2 is an exploded perspective view showing a configuration of a bias magnetic field applying device and a cam plate, and FIG. 2B is an exploded perspective view showing a configuration of a cartridge holder and a bias magnetic field applying device.

FIG. 9 is a diagram illustrating a main configuration of a magneto-optical disk drive device according to a fourth embodiment of the present invention;
Is a plan view, (b) is a rear view of the same figure (a), (c)
FIG. 4 is a sectional view taken along the line cc in FIG.

FIG. 10A is a diagram showing a configuration of a side yoke used in a magneto-optical disk drive device according to a fourth embodiment of the present invention, and FIG. The figure which shows the structure of (a), (c) is an enlarged view of the part of the holding hole of a support means.

FIG. 11A is a diagram showing an arrangement configuration of an actuator used in a magneto-optical disk drive device according to a fourth embodiment of the present invention, and FIG. 11B is a side view thereof.

FIG. 12 is a perspective view showing the configuration of a conventional magneto-optical disk drive.

FIG. 13 is a diagram showing a state in which different types of magneto-optical disks are inserted into a conventional magneto-optical disk drive.

[Explanation of symbols]

 32 Magneto-optical disk 34 Magneto-optical disk 36 Disk cartridge 38 Disk cartridge 42 Cartridge holder 46 Bias magnetic field applying device 48 Upper plate

Claims (3)

[Claims] 1. A magneto-optical recording medium is movable at least in a direction perpendicular to a surface of the magneto-optical recording medium so as to apply a desired bias magnetic field to the magneto-optical recording medium in accordance with a type of the magneto-optical recording medium. A magneto-optical disk drive device comprising the bias magnetic field applying device configured as described above. 2. A method for applying a desired bias magnetic field to the magneto-optical recording medium in a direction perpendicular to the surface of the magneto-optical recording medium and the magneto-optical recording medium in accordance with the type of the magneto-optical recording medium. A magneto-optical disk drive device comprising a bias magnetic field applying device configured to be movable in a tangential direction of an information track of a recording medium. 3. A method for applying a desired bias magnetic field to the magneto-optical recording medium in a direction perpendicular to the surface of the magneto-optical recording medium and the magneto-optical recording medium in accordance with the type of the magneto-optical recording medium. A magneto-optical disk drive device comprising a bias magnetic field applying device having a center yoke configured to be movable in a tangential direction of an information track of a recording medium.