JPH06119603A - Magneto-optical disk drive device - Google Patents

Abstract

PURPOSE:To provide a magneto-optical disk drive device which provides interchange-abilities to ISO specified magneto-optical disks, is thin and small in size and be overwritten. CONSTITUTION:An initialization magnetic field generating means 10 is placed along the radial direction of a magneto-optical disk 60 and facing the disk 60. The means 10 is constituted by a yoke 11, an initialization magnet 12 and a pair of supporting shafts 13 and 13. The yoke 11 and the magnet 12 are made freely rotatable in the approaching or separating directions to the disk 60 by an actuator. The actuator is constituted by a solenoid plunger and a link mechanism. Thus, when an ISO specified magneto-optical disk is used, the yoke 11 and the magnet 12 are rotated to the upper direction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention is capable of overwriting (overwriting data) with a magneto-optical disk (hereinafter referred to as the current magneto-optical disk) conforming to the ISO (International Organization for Standardization) standards that is currently in practical use. The present invention relates to a compatible magneto-optical disk drive device capable of erasing and writing data in both magneto-optical disks having a recording layer and an auxiliary layer in a recording film.

[0002]

2. Description of the Related Art In the existing magneto-optical disk, it is necessary to erase old data and then write new data, so that it takes time to rewrite the data. Therefore, an optical intensity modulation type magneto-optical disk capable of overwriting (erasing old data when old data is recorded) that can be written without erasing, and a drive device thereof have been developed. This is shown in FIG.
7, the reference numeral 1 in FIG. 7 denotes a magneto-optical disk drive device, and a case 51 shown in FIG. 9 and a current magneto-optical disk 60 ′ housed in the case 51.
Alternatively, it is compatible with both of the respective disk cartridges 50 each consisting of an overwritable optical intensity modulation type magneto-optical disk 60 ″ (generically indicated by reference numeral 60). 60 'is
For example, an outside diameter 13 of the IOS standard having a single recording film on the substrate
0 mm (5.25 inch), overwritable optical intensity modulation type magneto-optical disk 60 ″
Is a recording film having a recording layer 60a and an auxiliary layer 60b, for example, having an outer diameter of 130 mm.

The magneto-optical disk drive device 1 is provided with a chassis 2 as a base, a spindle motor 3 arranged at substantially the center of the chassis 2 for rotating a magneto-optical disk 60, and the chassis 2. A carriage 5 reciprocally moved along a radial direction of the magneto-optical disk 60 chucked by the spindle motor 3 along a pair of guide shafts 4 and 4, and a carriage 5 arranged on the carriage 5. The optical pickup 6 for reading and writing data on the magneto-optical disk 60 and the upper surface of the magneto-optical disk 60 facing the optical pickup 6 are opposed to each other so as to extend along the radial direction of the magneto-optical disk 60. The bias magnet (external magnetic field generating means) 7 arranged and the radial of the magneto-optical disk 60. Along the direction initialization magnet facing the upper surface of the magneto-optical disk 60 (initializing magnetic field generating means) 8
It has and.

The disc cartridge 50 having the magneto-optical disc 60 is designed to be loaded and unloaded on the spindle motor 3 via a cartridge holder H (only shown in FIG. 8). The bias magnet 7 is a permanent magnet, and is attached to the cartridge holder H. Further, the initialization magnet 8 is composed of a permanent magnet, and the parallel movement mechanism 9 shown in FIG.
It is reciprocally movable in the up-down direction with respect to the upper surface of the case 51 of the disk cartridge 50 in which the magneto-optical disk 60 is accommodated by being attached to the cartridge holder H via.

The parallel moving mechanism 9 detects the type (60 ', 60 ") of the magneto-optical disk 60 to be used electrically or mechanically by a predetermined means, and the external magnetic field at the time of storage is 600 Oe. When the current magneto-optical disk 60 ', which is guaranteed only below, is used, the initialization magnet 8 is retracted in advance so as to move away from the current magneto-optical disk 60', and the overwritable light intensity is set. When the modulation type magneto-optical disk 60 ″ is used, the initialization magnet 8 is arranged close to the magneto-optical disk 60 ″ as shown in FIG. The initial magnetic field of 3 to 7 kOe prevents the data recorded on the existing magneto-optical disk 60 'from being accidentally erased.

When data is written to the magneto-optical disk 60 "of the light intensity modulation system which can be overwritten by the magneto-optical disk drive device 1, an initialization magnetic field of 3 to 7 kOe generated by the initialization magnet 8 is applied. By utilizing this, the direction of the magnetic pole of the auxiliary layer 60b of the magneto-optical disk 60 ″ is adjusted to a specific direction. After the direction of the magnetic poles of the auxiliary layer 60b becomes uniform, the initialization magnet 8 is provided by the bias magnet 7 arranged at a position on the rotation rear side of the magneto-optical disk 60 ″ and right above the optical pickup 6. An external magnetic field (bias magnetic field) of 200 to 400 Oe having a polarity opposite to that of the initializing magnetic field is applied to the magneto-optical disk 60 ″, and is emitted from the objective lens 6a of the optical pickup 6 at the film surface of the magneto-optical disk 60 ″. The magnetization of the film surface is lost by using the heat of the focused laser light (above the Curie temperature),
The magnetization direction of the film of the magneto-optical disk 60 ″ is determined, that is, recorded in the direction of the magnetic field when cooled. On the other hand, the information recorded on the magneto-optical disk 60 ″ is much weaker than that at the time of recording. Reading is performed by utilizing the fact that the plane of polarization of light reflected by focusing light changes depending on the direction of magnetization (Kerr effect).

The magneto-optical disk drive device 1 is also provided.
When writing data to the existing magneto-optical disk 60 ', the parallelizing mechanism 9 retracts the initialization magnet 8 in the direction shown by the dotted arrow in FIG. 8 in the direction away from the magneto-optical disk 60'. . As a result, the initialization magnet 8
Of the magneto-optical data 60 'by the bias magnetic field 7 and the optical pickup 6 without being affected by the strong magnetic field of
Are recorded and read again.

[0008]

However, in the conventional magneto-optical disk drive device 1 described above, when used for the existing magneto-optical disk 60 ', the parallelizing mechanism 9 causes the initialization magnet 8 to move the initialization magnet 8 to the magneto-optical disk 60'. Since the device must be moved in parallel in the direction away from the device, there is a drawback in that the dead space is generated correspondingly and the structure of the parallel moving mechanism 9 is complicated, and the entire device is thick and large.

Therefore, according to the present invention, the initialization magnetic field generating means can be brought close to and away from the magneto-optical disk in a space-saving manner, and compatibility with the existing magneto-optical disk can be achieved, and the entire apparatus is thin. The present invention provides a magneto-optical disk drive device that can be downsized.

[0010]

A motor for rotating a magneto-optical disk, an external magnetic field generating means facing the magneto-optical disk in the radial direction of the magneto-optical disk, and an external magnetic field sandwiching the magneto-optical disk. In a magneto-optical disk drive device comprising an optical pickup facing the generating means, and an initialization magnetic field generating means facing the magneto-optical disk along the radial direction of the magneto-optical disk, the initialization magnetic field generating means, It is composed of a yoke, an initialization magnet, and a support shaft, and the yoke and the initialization magnet are rotatable about the support shaft in a direction toward and away from the magneto-optical disk.

[0011]

The initializing magnetic field generating means is rotated in a space-saving direction so as to approach and separate from the magneto-optical disk. As a result, compatibility with the existing magneto-optical disk can be achieved, and thinning and downsizing of the entire device can be achieved.

[0012]

Embodiments of the present invention will be described in detail below with reference to the drawings. The same parts as those of the conventional structure are designated by the same reference numerals, and detailed description thereof will be omitted. The disc cartridge 50 shown in FIG. 9 is also incorporated.

In FIG. 1, reference numeral 1 designates a case 51 and an existing magneto-optical disk 60 'housed in the case 51 or a magneto-optical disk 60 "of an overwritable light intensity modulation system.
A compatible magneto-optical disk drive device that can be used for both of the disk cartridges 50 (collectively denoted by reference numeral 60), and the chassis 2 as a base.
And a spindle motor 3 disposed at substantially the center of the chassis 2 for rotating the magneto-optical disk 60 and a pair of guide shafts 4 and 4 disposed on the chassis 2 and chucked by the spindle motor 3. Further, a carriage 5 that reciprocates along a radial direction of the magneto-optical disk 60 via a linear motor (not shown), and an optical pickup 6 arranged on the carriage 5 for reading and writing data on the magneto-optical disk 60.
A bias magnet (external magnetic field generating means) 7 disposed on the upper surface of the magneto-optical disk 60 facing the optical pickup 6 so as to face the magneto-optical disk 60 in the radial direction of the magneto-optical disk 60; It is the same as the conventional configuration in that it is provided with the initializing magnetic field generating means 10 facing the upper surface of the magneto-optical disk 60 along the radial direction of 60.

Here, the initialization magnetic field generating means 10 is
A yoke (back yoke) 11 made of a ferromagnetic material and having a U-shaped cross section
At the center of the yoke 11
Initializing magnets (permanent magnets) 1 slightly protruding from each tip of
2 and a pair of support shafts 13 and 13 projecting from one end of each side surface of the yoke 11 so as to extend in parallel with each end surface of the yoke 11. This pair of spindles 1
3 and 13 are rotatably supported by both front standing portions 21 and 21 of the plate 20 attached to the cartridge holder H. An actuator 30 is attached to the concave base portion 22 of the plate 20.
The yoke 11 and the initialization magnet 12 are rotated by 0 in the range of about 90 degrees in the direction toward and away from the magneto-optical disk 60 about the pair of support shafts 13 and 13. The actuator 30 is composed of a solenoid plunger 31 and a link mechanism 32, and the tip of the link mechanism 32 is pivotally supported by a pin at the center of the rear surface of the yoke 11.

According to the magneto-optical disk drive device 1 of the above embodiment, as shown in FIG.
An initializing magnetic field of 3 to 7 kOe is generated in the gap between the N pole of the initializing magnet 12 and the front end surface of the yoke 11 forming the zero magnetic circuit. Then, as shown in FIG.
Overwritable optical intensity modulation type magneto-optical disk 6
When the disk cartridge 50 having 0 ″ is used, the initialization magnetic field generating means 10 is provided via the actuator 30 to apply the initialization magnetic field to the auxiliary layer 60b of the magneto-optical disk 60 ″. It is rotated in the direction opposite to the 60 "side. On the other hand, as shown in FIG. 5B, when the disk cartridge 50 having the current magneto-optical disk 60 'is used, the current magneto-optical disk 60' is used. In order to prevent the initialization magnetic field of the initialization magnetic field generation means 10 from being applied to the recording layer of the actuator 3,
By 0, the initialization magnetic field generating means 10 is rotated in the direction away from the existing magneto-optical disk 60 'and retracted in advance. The actuator 30 detects the type (60 ', 60 ") of the magneto-optical disk 60 to be used by a predetermined means electrically or mechanically according to the shape of the case 51 of each disk cartridge 50, and the like. The initialization magnetic field generating means 10 is switched to the state shown in FIG. 5A or 5B, respectively.

In this way, the actuator 30 can rotate the initialization magnetic field generating means 10 in the direction of approaching and separating from the magneto-optical disk 60 in a space-saving manner on the cartridge holder H, and the spectroscopic magnetic disk drive device 1 thereof. The overall thinness and miniaturization can be achieved. Further, since the actuator 30 is constituted by the solenoid plunger 31 and the like, the initialization magnetic field generating means 1 can be driven with a small power-saving driving force.
0 can be rotated. Furthermore, since the actuator 30 generates the initialization magnetic field of the initialization magnetic field generation means 10 only in a specific direction, it is easy to take measures against the leakage of the initialization magnetic field. Further, since the actuator 30 is a mechanism for rotating the link mechanism 32 by the solenoid plunger 31, the structure is extremely simple as compared with the conventional parallel movement mechanism 9, and the cost of the entire apparatus can be reduced accordingly. .

FIG. 6 shows an actuator 40 of another embodiment. The actuator 40 includes a DC motor 41,
The reduction gear train 42 and the link mechanism 43 constitute the same operation and effect as the actuator 30 shown in FIG.

Although the permanent magnets are used as the bias magnets and the initialization magnets in each of the above embodiments, electromagnets may be used. Further, although the bias magnet, the initialization magnet and the yoke are arranged on the upper surface side of the magneto-optical disk, they may be arranged on the lower surface side of the magneto-optical disk. Further, the drive device used for the overwritable optical intensity modulation type magneto-optical disk has been described, but it can be applied to the drive device used for the overwritable magnetic field (intensity) modulation type magneto-optical disk. Of course.

[0019]

As described above, according to the magneto-optical disk drive device of the present invention, the magneto-optical disk is provided with the initialization magnetic field generating means facing the magneto-optical disk in the radial direction, and the initialization magnetic field is provided. The generating means is composed of a yoke, an initialization magnet, and a support shaft, and the yoke and the initialization magnet are rotated about the support shaft in a direction of approaching and separating from the magneto-optical disk via an actuator. Since it is flexible, the initialization magnetic field generating means can be moved closer to and away from the magneto-optical disk in a space-saving manner, and compatibility with the existing magneto-optical disk can be achieved, and
It is possible to reduce the thickness and size of the entire device.

According to the magneto-optical disk drive device of the third and fourth aspects, the actuator comprises a solenoid plunger and a link mechanism, or a motor, a reduction gear train and a link mechanism. Therefore, it is possible to simplify the structure of the rotating mechanism that brings the initialization magnetic field generating means closer to and away from the magneto-optical disk, and the cost of the entire apparatus can be reduced accordingly.

[Brief description of drawings]

FIG. 1 is a perspective view of a magneto-optical disk drive device showing an embodiment of the present invention.

FIG. 2 is a perspective view of an initializing magnetic field generating means used in the magneto-optical disk drive device as viewed from the back side.

FIG. 3A is a side view of the initialization magnetic field generating means,
(B) is the same rear view, (c) is the same front view.

FIG. 4 is a side view of an actuator that rotates the initialization magnetic field generating unit.

5A is an explanatory view when using a magneto-optical disk of a light intensity modulation system capable of overwriting, and FIG. 5B is an explanatory view when using a current magneto-optical disk.

FIG. 6 is a side view of an actuator according to another embodiment.

FIG. 7 is a perspective view of a conventional magneto-optical disk drive device.

FIG. 8 is an explanatory view of a mechanism for moving an initialization magnet of the conventional magneto-optical disk drive device.

FIG. 9 is a perspective view of a disk cartridge that accommodates a current magneto-optical disk or an overwritable magneto-optical disk.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Magneto-optical disk drive device 3 ... Spindle motor (motor) 6 ... Optical pickup 7 ... Bias magnet (external magnetic field generating means) 10 ... Initializing magnetic field generating means 11 ... Yoke 12 ... Initializing magnet 13 ... Spindle 30 ... Actuator 31 ... Solenoid plunger 32 ... Link mechanism 40 ... Actuator 41 ... DC motor (motor) 42 ... Reduction gear train 43 ... Link mechanism 60 ... Magneto-optical disk

Claims (4)

[Claims] 1. A motor for rotating a magneto-optical disk,
External magnetic field generating means facing the magneto-optical disk along the radial direction of the magneto-optical disk, an optical pickup facing the external magnetic field generating means across the magneto-optical disk, and along the radial direction of the magneto-optical disk. In the magneto-optical disk drive device provided with the initialization magnetic field generating means facing the magneto-optical disk, the initialization magnetic field generating means is composed of a yoke, an initialization magnet and a spindle, and the spindle is the center. The magneto-optical disk drive device is characterized in that the yoke and the initialization magnet are rotatable in directions approaching and separating from the magneto-optical disk. 2. The magneto-optical disk drive device according to claim 1, wherein the yoke and the initialization magnet are rotatable by an actuator in a direction of approaching and separating from the magneto-optical disk. Drive device. 3. The magneto-optical disk drive device according to claim 2, wherein the actuator comprises a solenoid plunger and a link mechanism. 4. The magneto-optical disk drive device according to claim 2, wherein the actuator comprises a motor, a reduction gear train, and a link mechanism.