JP2970694B2 - External magnetic field applying device for cartridge type magneto-optical disk drive - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an external magnetic field applying device for a cartridge type magneto-optical disk drive.

In recent years, a cartridge type magneto-optical disk drive in which a magneto-optical disk is formed into a cartridge and this cartridge is inserted and mounted has been developed.

A cartridge type magneto-optical disk drive of this type is required to be thin, and an external magnetic field applying device needs to have a configuration capable of reducing the thickness of the magneto-optical disk drive.

In order to reduce the thickness of the magneto-optical disk device, it is desirable that the external magnetic field applying device is mounted on a cartridge holder into which the magneto-optical disk cartridge is inserted.

[0005]

2. Description of the Related Art An example of a conventional external magnetic field applying apparatus is disclosed in
It is shown in No. 2 -40104.

This external magnetic field applying device reverses the direction of the magnetic field to the surface of the magneto-optical disk. In this known example, an axis is formed at the center of the permanent magnet in the longitudinal direction, and this axis is set to one.
This is a configuration provided on the upper surface side of the cartridge holder so as to rotate by 80 °.

[0007]

For this reason, the height of the magneto-optical disk device is higher than the upper surface of the cartridge holder by the height of the external magnetic field applying device. This height is about 10 mm even if the rotating mechanism is downsized, which is inconvenient in reducing the thickness of the magneto-optical disk device.

An object of the present invention is to provide an external magnetic field applying device suitable for reducing the thickness of a cartridge type magneto-optical disk device.

[0009]

Means for Solving the Problems of claims 1 invention, Sha
Cartridge body having a shutter window, and a shutter covering the window.
And a magneto-optical device housed inside the cartridge body.
Magneto-optical disk cartridge consisting of
Open the shutter and insert it into the cartridge holder.
Magnetic field of the cartridge type magneto-optical disk drive
In field application device, of the cartridge body said shut
Window reaches the end of the cartridge body in the insertion direction.
A configuration are I, the cartridge holder in which the magneto-optical disk cartridge is inserted, to form a notch window,
A plate-shaped permanent magnet in which different magnetic poles are adjacent on a plane projects through the cutout window into the cartridge holder, and is provided in the cutout window so as to be displaceable in a surface direction of the cartridge holder . In the above cartridge holder
Window of magneto-optical disk cartridge inserted in
And the flat permanent magnet is displaced in the plane direction of the cartridge holder in the notch window and the shutter window, so that the magneto-optical disk in the cartridge inserted into the cartridge holder is displaced. Of these, the magnetic field applied to the portion facing the optical head is inverted.

According to a second aspect of the present invention, there is provided a camera having a shutter window.
A cartridge body, a shutter covering the window, and the cartridge;
Magneto-optical disk housed inside the printer body
The magneto-optical disk cartridge opens the shutter.
Cart that is inserted into the cartridge holder
In the external magnetic field application device of the ridge type magneto-optical disk drive
Te, the shutter window of the cartridge body, the cart
The configuration extends to the tip of the ridge body in the insertion direction.
Ri, the cartridge holder in which the magneto-optical disk cartridge is inserted, to form a notch window, a plate-shaped permanent magnet which different magnetic poles are adjacent on a plane, provided by fixing to the lower surface of the rotation support plate, the pivoting One end of the support plate is provided at a position on the center side of the cartridge holder so that the rotation support plate is rotatably supported in the surface direction of the cartridge holder, and the cartridge inserted into the cartridge holder is provided. A mechanism for reciprocatingly rotating the flat permanent magnet so that a magnetic field applied to a portion of the magneto-optical disk facing the optical head is reversed is arranged so as to face the free end side of the rotation support plate. The flat permanent magnet is inserted into the cartridge holder.
Into the shutter window of the magneto-optical disk cartridge
Mudake projects, the plate-like permanent magnet, the notch window and then rotationally displaced in the plane direction of the cartridge holder in the shutter window, the magneto-optical disk in the cartridge that is inserted into the cartridge holder Of these, the magnetic field applied to the portion facing the optical head is inverted.

According to a third aspect of the present invention, the reciprocating rotary mechanism according to the second aspect of the present invention includes the driving permanent magnet which rotates integrally with the flat permanent magnet and the driving mechanism at each rotation position of the flat permanent magnet. A yoke fixed to the cartridge holder so as to face the permanent magnet for use, a drive coil provided on the yoke, and a drive circuit for supplying current to the drive coil only when rotating the flat permanent magnet After the flat permanent magnet is rotated, the driving permanent magnet is magnetically attracted to the yoke and is held by itself.

According to a fourth aspect of the present invention, the reciprocating rotary mechanism of the second aspect is configured such that a drive coil fixed to the cartridge holder and provided to face the flat permanent magnet and the flat permanent magnet are provided. The driving circuit supplies a current to the driving coil when rotating.

[0013]

According to the first aspect of the present invention, the permanent magnet is formed in a flat plate shape and the flat permanent magnet is displaced in the surface direction of the cartridge holder. It is possible to fit within the thickness. This makes it possible to reduce the thickness of the cartridge type magneto-optical disk device.

According to the second aspect of the present invention, the flat permanent magnet is rotatable about an axis perpendicular to the cartridge holder, so that the flat permanent magnet can be stably displaced in the surface direction of the cartridge holder.

According to the third aspect of the present invention, the driving permanent magnet, the yoke, and the driving coil enable these to be accommodated within the thickness of the cartridge holder.

The self-holding configuration enables power saving.

According to the fourth aspect of the present invention, the configuration in which the drive coil faces the plate-shaped permanent magnet enables the number of parts to be reduced and allows the cartridge to be accommodated within the thickness of the cartridge holder.

[0018]

FIG. 1 shows an external magnetic field applying apparatus 1 according to a first embodiment of the present invention. 2 and 3 show the external magnetic field applying apparatus 1 and a cartridge type magneto-optical disk apparatus 2 to which the apparatus 1 is applied.
Is shown.

In the figure, 3 is a cartridge holder, 4 is a slider, and 5 is a chassis base.

In the magneto-optical disk cartridge 10, a magneto-optical disk 11 is accommodated in a cartridge body 12, and
Further, the shutter 13 is provided so as to cover the window 14 of the cartridge body 12.

As will be described later, the external magnetic field applying device 1
It is provided on the cartridge holder 3.

The cartridge 10 is inserted into the cartridge holder 3 as shown by an arrow A in FIG. 1, and the magneto-optical disk 11 is connected to the external magnetic field applying device 1 and the optical head 15 as shown by a two-dot chain line in FIG. It is mounted in a state of being in close proximity to the device. As a result, information can be recorded and reproduced, and the magneto-optical disk 11 rotates to start recording and reproduction.

Next, the external magnetic field applying device 1 will be described with reference to FIG.

Numeral 20 denotes a plate-shaped permanent magnet, which has a substantially sector shape, is magnetized in opposite directions on the left and right sides with respect to a center line 20c extending in the thickness direction and the longitudinal direction, and has two different permanent magnet portions 20a. , 20b are adjacent to each other.

The plate-shaped permanent magnet 20 is fixed to the lower surface of the rotation support plate 21. On the lower surface, an S pole and an N pole are arranged adjacent to each other.

The rotation support plate 21 has one end thereof at the center of the upper surface of the top plate 3a of the cartridge holder 3 shown in FIG.
Supported by a pin member 23 via a washer 22;
An axis 24 extending to the back of the device 2 and perpendicular to the top plate 3a
Are rotatably provided in the directions of arrows B ₁ and B ₂ .

The plate-shaped permanent magnet 20 fits into the cutout window 3b of the cartridge holder 3, and passes through the cutout window 3b.
Partly protrudes into the cartridge holder 3. The flat permanent magnet 20 is rotationally displaced within the cutout window 3b within the plane of the top plate 3a of the cartridge holder 3.

For example, in the recording mode, as shown in FIG. 5A, the permanent magnet section 20a faces the optical head 15, and a downward magnetic field is applied to a track of the disk 11 on which an information signal is to be recorded. Applied.

At the time of the erasing mode, the permanent magnet 20
_The track is rotated in _one direction, and the permanent magnet 20b adjacent to the permanent magnet 20a is opposed to the optical head 15 as shown in FIG. , An upward magnetic field is applied.

In FIG. 1, reference numeral 25 denotes a mechanism for reciprocatingly rotating the plate-shaped permanent magnet 20, which comprises a drive coil 26, a yoke 27, a drive permanent magnet 28, and the like.

The drive coil 26 is provided on a gate-shaped yoke 27.

The yoke 27 has columnar yoke portions 27 on both sides.
The a and 27b are fixed to a tongue 3d extending to the back from the bottom plate 3c of the cartridge holder 3 and provided at the back of the cartridge holder 3.

The driving permanent magnet 28 has a rectangular column shape and is fixed to the lower surface on the distal end side of the rotation support plate 21. The longitudinal direction of the permanent magnet 28 is oriented in the direction of rotation of the rotation support plate 21, and the elongated side surface 28 a faces the yoke 27. The side surface 28a of the permanent magnet 28 has an N pole.

A drive circuit 29 temporarily supplies a current to the drive coil 26 when reversing the magnetic field.

Next, the operation of the reciprocating rotation mechanism 25 having the above configuration will be described.

In the recording mode shown in FIG.
The mechanism 25 is, as shown in FIG.
As shown schematically in FIG.
In a state of being magnetically attracted.

When reversing the applied magnetic field, a current i is temporarily supplied to the drive coil 26 by the drive circuit 29 of FIG. 1 as shown in FIG. 7B.

Thus, one yoke portion 2 of the yoke 27 is formed.
7a is N pole, another yoke portion 27b becomes an S pole, an arrow B ₁ direction of the force to the driving permanent magnet 28 is induced, the permanent magnet 28 is displaced in the same direction as shown in FIG. 7 (C).

After the displacement, the supply of the current i is cut off.

Even when the supply of the current i is cut off, as shown in FIG. 7D, the permanent magnet 28 is magnetically attracted to the yoke 27b , and the permanent magnet 28 is held at the rotated position.

For this reason, the power consumption is smaller than in the configuration in which the current i is continuously supplied to the drive coil 26.

The flat permanent magnet 20 is in the state shown in FIG.

[0043] Supplying reverse current to the driving coil 26, the induced force of the arrow B ₂ direction in the permanent magnet 28, rotating support plate 21 is rotated in the same direction, the permanent magnet 20 is 5 Return to the original position shown in FIG.

As shown in FIGS. 1, 3 and 5, the permanent magnet 20 is in the form of a flat plate and is displaced in the plane direction of the top plate 3a of the cartridge holder 3 in a state of being inserted inside the cartridge holder 3. In addition, since the reciprocating rotation mechanism 25 is also arranged to face the tip of the rotation support plate 21, the external magnetic field applying device 1 including the reciprocation rotation mechanism 25
Is it falls within the range of the thickness t ₁ of substantially the cartridge holder 3, the projecting dimension d than the top plate 3a of the cartridge holder 3 could be accommodated in about 1 mm.

For this reason, the cartridge type magneto-optical disk device 2 has a smaller height H and a smaller thickness than the conventional one.

FIG. 8 shows an external magnetic field applying device 40 according to a second embodiment of the present invention.

In the figure, parts that are substantially the same as the parts shown in FIG. 1 are given the same reference numerals.

A flat permanent magnet 2 is provided on the rotation support plate 21A.
0 is fixed, and the driving permanent magnet 28 is not provided.

The distal end of the rotation support plate 21A is bent in a substantially L-shape, and the distal end 21Aa is
Abuts on a slide plate 42 on a support plate 41 fixed to the tongue piece 3d.

Reference numeral 43 denotes a drive coil, which has a rectangular shape,
It is fixed on a support plate 41 and is arranged so as to face the tip of the flat permanent magnet 20.

When a current is supplied to the drive coil 43 by the drive circuit 44, a magnetic field is generated.
₁ or B ₂ direction of displacement force is generated, it is rotated to a position in FIG. 9 with the rotation support plate 21A (A) (B).

[0052]

As described above, according to the first aspect of the present invention, the external magnetic field applying device can be substantially contained within the thickness of the cartridge holder.

Thus, the thickness of the cartridge type magneto-optical disk drive can be reduced.

According to the second aspect of the present invention, the external magnetic field applying device can be substantially contained within the thickness of the cartridge holder, whereby the thickness of the cartridge type magneto-optical disk device can be reduced. The flat permanent magnet can be displaced stably.

According to the third aspect of the present invention, the reciprocating rotation mechanism can be configured to be thin, and power can be saved.

According to the fourth aspect of the present invention, the reciprocating rotation mechanism can be configured with a small number of parts and can be configured to be thin.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a first embodiment of an external magnetic field applying device according to the present invention.

FIG. 2 is an exploded perspective view showing a schematic configuration of the external magnetic field applying device of FIG. 1 and a cartridge type magneto-optical disk device to which the device is applied.

FIG. 3 is an elevational view showing a schematic configuration of the external magnetic field applying device of FIG. 1 and a cartridge type magneto-optical disk device to which the device is applied.

FIG. 4 is a perspective view of a flat permanent magnet and the like in FIG. 1 as viewed from below.

FIG. 5 is a diagram for explaining the operation of the external magnetic field applying device of FIG. 1;

FIG. 6 is a diagram schematically showing a reciprocating rotation mechanism in FIG. 1;

FIG. 7 is a plan view for explaining the operation of the reciprocating rotation mechanism of FIG.

FIG. 8 is a perspective view showing a second embodiment of the external magnetic field applying device of the present invention.

FIG. 9 is a diagram illustrating the operation of the external magnetic field applying device of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 External magnetic field application device 2 Cartridge type magneto-optical disk device 3 Cartridge holder 3a Top plate 3b Notch window 3c Bottom plate 3d Tongue 10 Magneto-optical disk cartridge 11 Magneto-optical disk 13 Shutter 14 Window 15 Optical head 20 Flat permanent magnet 20a, 20b Permanent magnet part 20c Center line 21 Rotation support plate 22 Washer 23 Pin member 24 Axis line 25 Reciprocating rotation mechanism 26, 43 Drive coil 27 Gate-type yoke 27a, 27b Yoke part 28 Permanent magnet 28a Side surface 29, 44 Drive circuit Reference Signs List 40 external magnetic field generator 41 support plate 42 slide plate

────────────────────────────────────────────────── (5) Continuation of the front page (51) Int.Cl. ⁶ Identification code FI G11B 17/04 413 G11B 17/04 413Z (56) References JP-A-61-214101 (JP, A) JP-A-63-142584 (JP, A) JP-A-2-56701 (JP, A) JP-A-1-184744 (JP, A) JP-A-57-113466 (JP, A) JP-A-2-302953 (JP, A) 61-121523 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) G11B 5 / 02,11 / 10,23 / 03

Claims (4)

(57) [Claims] 1. A cartridge body having a shutter window.
A shutter for covering the window; and an interior of the cartridge body.
Magneto-optical disk consisting of a magneto-optical disk housed in
The cartridge opens the shutter and opens the cartridge.
Cartridge type magneto-optical device that is inserted into the cartridge holder
In the external magnetic field applying device for a disk drive, the shutter window of the cartridge main body is connected to the cartridge.
A configuration that led to the insertion direction of the distal end of the di-body, the cartridge holder in which the magneto-optical disk cartridge is inserted, to form a notch window, a plate-shaped permanent magnet which different magnetic poles are adjacent on a plane, The cartridge protrudes into the cartridge holder through the notch window, and is provided so as to be displaceable in the surface direction of the cartridge holder within the notch window, and the permanent magnet is inserted into the cartridge holder.
Entering into the shutter window of the magneto-optical disk cartridge
Only projects, the plate-like permanent magnet, the notch window and the shutter window
Displaced in the planar direction of the cartridge holder in the inner and characterized in that a structure for inverting the magnetic field applied to the portion facing the optical head of magneto-optical disk in the cartridge that is inserted into the cartridge holder An external magnetic field applying device for a cartridge type magneto-optical disk drive. 2. A cartridge body having a shutter window.
A shutter for covering the window; and an interior of the cartridge body.
Magneto-optical disk consisting of a magneto-optical disk housed in
The cartridge opens the shutter and opens the cartridge.
Cartridge type magneto-optical device that is inserted into the cartridge holder
In the external magnetic field applying device for a disk drive, the shutter window of the cartridge main body is connected to the cartridge.
A configuration that led to the insertion direction of the distal end of the di-body, the cartridge holder in which the magneto-optical disk cartridge is inserted, to form a notch window, a plate-shaped permanent magnet which different magnetic poles are adjacent on a plane, An end of the rotation support plate is fixedly provided on the lower surface of the rotation support plate, and the one end side of the rotation support plate is positioned at the center side of the cartridge holder so that the rotation support plate can be rotationally displaced in the surface direction of the cartridge holder. A mechanism for reciprocatingly rotating the flat permanent magnet so that a magnetic field applied to a portion of the magneto-optical disk in the cartridge inserted into the cartridge holder facing the optical head is reversed. Provided in the cartridge holder so as to face the free end side of the rotation support plate, and the flat permanent magnet is inserted into the cartridge holder.
Inserted into the shutter window of the
Rikomu has only projecting the plate-like permanent magnet, the notch window and the shutter window within and rotationally displaced in the plane direction of the cartridge holder, the magneto-optical disk in the cartridge that is inserted into the cartridge holder Wherein the magnetic field applied to the portion facing the optical head is inverted. 3. The reciprocating rotation mechanism according to claim 2, wherein the driving permanent magnet is rotated integrally with the flat permanent magnet, and faces the driving permanent magnet at each rotation position of the flat permanent magnet. A yoke fixed to the cartridge holder as described above, a drive coil provided on the yoke, and a drive circuit for supplying current to the drive coil only when the flat permanent magnet is rotated, An external magnetic field applying device for a cartridge type magneto-optical disk drive, wherein after the flat permanent magnet is rotated, the driving permanent magnet is magnetically attracted to the yoke and is held by itself. . 4. A reciprocating rotating mechanism according to claim 2, wherein said drive coil is fixed to said cartridge holder and provided to face said plate-shaped permanent magnet, and said drive coil is rotated when said plate-shaped permanent magnet is rotated. An external magnetic field applying device for a cartridge type magneto-optical disk drive, comprising a drive circuit for supplying a current to the drive coil.