JP2989374B2 - Magneto-optical disk device and magneto-optical disk recording / reproducing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magneto-optical disk apparatus and a magneto-optical disk recording / reproducing apparatus for recording information by irradiating a light beam whose light intensity is modulated according to information from a light source.

[0002]

2. Description of the Related Art Conventionally, in recording information in a magneto-optical disk device, a method of once erasing previously recorded information and then recording new information is used. For this reason, an overwrite technique for performing erasing and recording at once has been desired. JP Hei 3
As shown in, for example, Japanese Patent No. 15672, a magneto-optical recording method for overwriting information by light modulation has been invented.

FIGS. 8 and 9 show a conventional example of a magneto-optical disk drive which overwrites information by light modulation.
FIG. 8 is a top view of the disk cartridge. FIG. 9 is a view showing a cross section taken along line XX ′ of FIG. 8 and shows a recording and reproducing state of the apparatus. In FIG. 9, the magneto-optical disk 1 is positioned on the shaft 4 of the spindle motor 3 by the center hub 2.

The center hub 2 is adjusted so that the tracks on the magneto-optical disk 1 are concentric with the holes 5 of the center hub 2, and is fixed to the magneto-optical disk 1 by bonding. The center hub 2 is partially or entirely made of a magnetic material. The center hub 2 is attracted by a chucking magnet 6 fixed to a spindle motor 3, and the magneto-optical disk 1
Is pressed against the turntable surface 7 of the spindle motor 3 and rotates together with the spindle motor 3. On the other hand, the optical pickup 8 has a laser light source, and forms a spot on the track of the magneto-optical disk 1 by the objective lens 9.

Further, a permanent magnet for generating an auxiliary magnetic field (magnetic field generating
A member 10 is provided to generate a magnetic field on the magneto-optical disk 1 in a direction indicated by an arrow 10 ′. With such a configuration, information is recorded on the disk according to the level of the laser power. In the configuration described above, the component arrangement is such that the spindle motor 3 and the optical pickup 8 are on the same side with respect to the magneto-optical disk 1, and the permanent magnet for generating the auxiliary magnetic field is used.
(Magnetic field generating member) 10 is on the opposite side to them.

[0006]

The above is a case where the disk is large, and it is necessary to reduce the size of the disk in order to further reduce the size of the apparatus in the future. If the diameter is smaller than a certain diameter, the spindle motor 3 and the optical pickup 8 interfere with each other, and the disk diameter cannot be reduced further. Therefore, there is a problem that a sufficient storage capacity cannot be obtained.

[0007]

SUMMARY OF THE INVENTION The present invention has been invented in view of the drawbacks of the conventional apparatus, according to the present invention,
Magneto-optical disk and rotatable magneto-optical disk
An opening that can be accommodated and is larger than the diameter of the magneto-optical disk
And an openable and closable shutter member for covering the opening.
A magneto-optical disk drive with a cartridge case
The length of the cartridge case in the longitudinal direction is
Light having a diameter of at least twice the diameter of a magnetic disk
A magnetic disk drive is provided. Here, the magneto-optical data
A ring-shaped disk holding member is provided on the outer periphery of the disk.
Insert the recess for inserting the disc holding member into the cartridge case.
Provided on the cartridge case, and the magneto-optical data from the cartridge case.
The disc may be prevented from falling off. Also,
A center hole is provided in the magneto-optical disk;
Can be inserted into the center hole,
Protrusions larger than the diameter are provided on the cartridge case
To prevent the magneto-optical disk from falling off.
No.

According to the present invention, when recording / reproducing information on / from a magneto-optical disk, the inner peripheral side of the periphery of the turntable is
The outer peripheral portion of the magneto-optical disk fits into the surface.
A magneto-optical disk recording / reproducing apparatus, wherein the magneto-optical disk is aligned with respect to the outer circumference , a light source is provided on a side opposite to the turntable with respect to the magneto-optical disk, and the magnetic field generating member is turned. A magneto-optical disk recording / reproducing device provided inside a table is provided.

[0009]

According to the above construction, in the magneto-optical disk drive according to the first aspect of the present invention, the diameter is larger than the diameter of the magneto-optical disk.
Can be completely covered with shutters
The area that holds the shutter stably when opened
Is preserved. Further, a magneto-optical disk storage device according to the invention of claim 4 is provided.
In a recording / reproducing device, magneto-optical
The disk is fixed, and the runout of the track is reduced.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below in detail with reference to the drawings. An embodiment of the present invention is shown in FIGS. Members having the same functions as the members shown in the drawings of the conventional example are denoted by the same reference numerals.

FIG. 1 is an external view of a cartridge of a magneto-optical disk according to the present invention, and is a top view showing a state in which a shutter 11 is closed. FIG. 2 is a top view showing a state where the shutter 11 is opened. FIG. 3 shows an optical pickup 8 and a spindle motor 3 added to the section AA ′ in FIG. As shown in FIG. 1, a magneto-optical disk 1 of the present invention is housed in a cartridge case 12, and a shutter 11 slides in the longitudinal direction to open and close.

Here, the cartridge case 12 must have a length that is at least twice the disk diameter. Because
Since the outer periphery of the magneto-optical disk 1 is chucked, the cartridge case 12 needs to have an opening larger than the diameter of the disk. When the shutter 11 that needs to cover the opening is opened, the shutter 11 is opened. This is because the cartridge case 12 needs an area for stable holding.

FIG. 4 is a partially detailed view of FIG. In FIG. 4, a magneto-optical disk 1 is an adsorption metal 1 made of a magnetic material.
The chuck 3 is chucked to the turntable 7 by an attractive force generated by the chucking magnet 6 fixed to the turntable 7.

Here, the magneto-optical disk 1 has an outer peripheral portion 1a.
Is fitted into the inner peripheral side surface 7a of the peripheral step portion of the turntable 7, so that the medium surface 1b of the magneto-optical disk 1 is
And is chucked on the basis of the medium surface. Here, if the tracks of the magneto-optical disk 1 are formed on the basis of the outer periphery, the runout of the tracks is reduced. Further, since the optical disk is fixed to the turntable on the basis of the medium surface, the influence of variations in the disk thickness can be omitted, and the focus servo becomes easy.

The light beam forms a spot on the medium surface 1b by the objective lens 9 from the side opposite to the spindle motor 3 with respect to the magneto-optical disk 1 chucked as described above. The auxiliary magnetic field is generated by an auxiliary magnetic field generating permanent magnet (magnetic field generating member) 10 fixed to the turntable 7.
It is applied vertically to the magneto-optical disk 1.

In the figure, a disk holding member 14 on a ring is fixed to the magneto-optical disk 1, and a part of the disk holding member 14 is inserted into a gap (recess) 12a of the cartridge case 12. The cartridge case 12 does not fall off.

FIG. 5 shows a case where the position of the turntable reference surface 7b in FIG. By doing so, the recording area of the magneto-optical disk 1 can be extended to the outer periphery, and the storage capacity can be increased.

FIGS. 6 and 7 show an embodiment in which the disk holding member 14 in FIG. 4 is omitted. In FIG. 6, the magneto-optical disk 1 has a center hole 1c at the center. On the other hand, the cartridge case 12
b is larger than the diameter of the center hole 1c.
It has a b _1, so that the disc does not fall out from the cartridge case.

[0019]

The magneto-optical disk drive according to the first aspect of the present invention.
The opening larger than the diameter of the magneto-optical disk.
And can be completely covered with a shutter
The shutter can be held stable when the
You. A magneto-optical disk according to the second and third aspects of the present invention.
In the device, even when the shutter is opened, the cartridge
The effect is that the magneto-optical disk does not fall out of the source.
Can be obtained.

A magneto-optical disk recording according to the invention of claim 4
In the playback device, a magneto-optical
Since the disc is fixed, the swing of the track can be reduced.
In the magneto-optical disk recording / reproducing apparatus according to the fifth aspect, the light source is provided on the opposite side of the magneto-optical disk from the turntable , and the magnetic field generating member is provided inside the turntable. Thus, the interference between the light source and the light source can be avoided, and the light source and the spindle motor can be arranged without difficulty. As a result, it is possible to cope with a magneto-optical disk having a small diameter equal to or smaller than the diameter of the spindle motor, and a smaller magneto-optical disk device can be realized.

[Brief description of the drawings]

FIG. 1 is a plan view showing a closed state of a cartridge case provided with a magneto-optical disk according to the present invention.

FIG. 2 is a plan view of the magneto-optical disk recording / reproducing apparatus according to the embodiment of the present invention in which the cartridge case is loaded and the lid is opened.

FIG. 3 is a side sectional view taken along line AA ′ of FIG. 2;

FIG. 4 is an enlarged view of a main part of FIG. 3;

FIG. 5 is a side sectional view showing another embodiment of the magneto-optical disk recording / reproducing apparatus according to the present invention.

FIG. 6 is a plan view showing a state in which a cartridge case provided with a magneto-optical disk according to another embodiment of the present invention is mounted on a magneto-optical disk recording / reproducing apparatus.

FIG. 7 is a side sectional view taken along line BB ′ of FIG. 6;

FIG. 8 is a plan view showing a state where a cartridge case provided with a conventional magneto-optical disk is mounted on a magneto-optical disk recording / reproducing apparatus.

FIG. 9 is a side sectional view taken along line XX ′ of FIG. 8;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Magneto-optical disk 3 Spindle motor 6 Magnet for chucking 7 Turntable 8 Optical pickup 10 Permanent magnet for generating auxiliary magnetic field (magnetic field generating member) 12 Cartridge case 14 Disk holding member

Claims (5)

(57) [Claims] 1. A magneto-optical disk, wherein the magneto-optical disk can be rotatably accommodated, and
An opening larger than the disk diameter and an opening and closing cover for the opening
Cartridge case with a shutter member
A magneto-optical disk drive comprising:
Magneto-optical characterized by being at least twice the disk diameter
Disk device . 2. A ring-shaped outer periphery of the magneto-optical disk.
Providing a disk holding member and inserting the disk holding member
2. The cartridge case according to claim 1, wherein a concave portion is provided in the cartridge case.
Magneto-optical disk device . 3. A center hole is provided in the magneto-optical disk , and the center hole can be inserted into the center hole.
2. The magneto-optical disk drive according to claim 1, wherein a protrusion larger than the diameter of the center hole is provided on the cartridge case. 4. A method for recording and reproducing information by irradiating a light beam from a light source while applying a magnetic field to a magneto-optical disk mounted on a turntable fixed to a rotation shaft of a spindle motor and rotating. A magneto-optical disc on the inner peripheral side surface of the periphery of the turntable.
A magneto-optical disk recording / reproducing apparatus , wherein the magneto-optical disk is positioned with reference to the outer circumference when the outer circumference of the disk fits . Wherein said light source to the optical disk coater
Provided on the opposite side to the down table, and magneto-optical disc recording and reproducing apparatus according to claim 4, wherein providing the magnetic field generating member on the inside of the turn table.