JP2000268435A - Magneto-optical disk device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To minimize the misalignment of a magnetic head of a sliding type for magneto-optical recording in a disk tangential direction by the vertical movement of the magnetic head and to enable the reduction in the size and thickness of a magneto-optical disk device. SOLUTION: This magneto-optical disk device has an optical pickup part 50 which imparts a light spot for recording, reproducing and erasing to a magneto-optical disk 60, a sliding part 25 which locates the magnetic head for imparting the magnetic field for recording and erasing to the spot irradiated position of the recording surface of the magneto-optical disk 60 at a specified distance from the magneto-optical disk 60, a magnetic head arm 29 of an approximate L shape for connecting the magnetic head and the optical pickup and an elastic member 27 which is fixed to the magnetic head arm 29 and vertically movably supports the sliding part 25.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic head mechanism for contacting and sliding a magnetic head for recording a signal on a disk-shaped recording medium and a disk device using the same, and more particularly, to a vertical movement of the magnetic head. The magnetic head mechanism can reduce the displacement of the magnetic head in the disk tangential direction and can reduce the size and thickness of the magneto-optical disk device, and can be suitably used for a disk device using the same.

[0002]

2. Description of the Related Art A conventional technique will be described below with reference to FIGS.

FIG. 5 is a view showing the structure of a magnetic head, FIG. 6 is a side view and a top view of a magnetic head core, FIG. 7 is a view showing the structure of a magnetic head and a magnetic head holder, and FIG. 8 is an optical pickup and a magnetic head. A diagram showing an arrangement configuration of a support mechanism,
FIG. 9 is a diagram showing the structure of a magneto-optical disk.

[0004] At first, a magneto-optical disk is attracting attention as a large-capacity disk having an advantage of being rewritable.
In recent years, in particular, the use of MDs (minidiscs) using the magnetic field modulation method has been remarkable. The structure of this magneto-optical disk will be described with reference to FIG.

A magneto-optical disk 60 is provided on a magneto-optical disk substrate 61 made of PC (polycarbonate) or the like.
A magneto-optical recording layer 63 is provided via a protective film 62 made of N. An AlN protective film 62 and a reflective film 64 made of Al or the like are provided on the magneto-optical recording layer 63 again, and a resin protective film 65 made of an ultraviolet curable resin is further formed on the reflective film 64.
Is formed.

[0006] In the case of MD, a lubricating film 66 having high lubricity such as silicon oil is further applied on the resin protective film 65 in order to use a contact sliding type magnetic head.

Next, the structure of the magnetic head will be described below with reference to FIGS.

In FIG. 5, the magnetic head 20 has a wire diameter of φ50 μm to φ10
A coil 21 made of a conductive material having a thickness of 0 μm is wound around a bobbin 22 and attached to a center pole core of an E-shaped ferrite core 23 shown in FIG.

The formed magnetic head 20 is shown in FIG.
As shown in (1), it is integrally attached to and held by a magnetic head holding portion 25 having a sliding portion 26 which is a portion directly in contact with the magneto-optical disk.

The sliding portion 26 is formed from a material having a low coefficient of friction in a mold, and examples of the material include ceramics in addition to polymer materials such as polyarylate, nylon, and polyester. As another method, the sliding portion 26 may be formed of another material, and a tape-shaped material having a low coefficient of friction may be attached to a portion that comes into contact with the magneto-optical disk.

Hereinafter, the magnetic field modulation method will be described with reference to FIG.

[0012] With the above-described magneto-optical disk 60 interposed therebetween,
One is an optical pickup 50 for irradiating a laser beam, and the other is a magnetic head 2 provided inside the above-described magnetic head holding unit 25 which moves in accordance with a laser spot position.
The signal is recorded on the magneto-optical disk 60 by disposing 0 and inverting the magnetic field generation direction of the magnetic head 20 according to the recording signal.

Further, the magnetic head 20 and the magnetic head holding portion 25 have a normal thickness of 30 to 30 mm so that the magnetic head 20 and the magnetic head holding portion 25 can move following the disk runout, dust, bumps, etc. on the disk.
The elastic member 27 made of a thin metal of 100 μm allows
It is supported with a preload of 10 mN. One end of the elastic member 27 is fixedly supported by a fixing portion 28.

The fixed portion 28 is connected to and supported by an optical pickup 50 by a substantially U-shaped magnetic head arm 29.

The generated magnetic field greatly depends on the distance from the magneto-optical disk 60 as a characteristic. To generate a predetermined magnetic field on the magneto-optical disk 60 as the distance increases, it is necessary to use a magnetic head. More current needs to flow through 20. As a result, the efficiency of the magnetic head 20 decreases, and there is a concern that the magnetic head 20 may be damaged by heat generation. Therefore, it is necessary to make the distance between the magneto-optical disk 60 and the magnetic head 20 as close as possible.

Therefore, as shown in FIG.
The magnetic head holding part 25 for holding the magnetic head is provided with a sliding part 26 made of a material having a high sliding property,
The step is set so as to be 100 μm. Then, the magnetic head 20 directly contacts the lubricating film 66 of the magneto-optical disk 60.
By making the sliding portion 26 and the lubricating film 66 contact with each other while preventing the contact with the disk, the distance between the disk and the head can be kept constant without requiring a complicated mechanism. This is called a sliding magnetic head, and is currently widely used.

Magneto-optical recording is performed using the contact type magnetic head support mechanism described above.

[0018]

In the conventional magnetic head supporting mechanism, the magnetic head arm has a substantially U-shape, and a magnetic head suspension is provided on the magnetic head arm in a cantilever shape substantially parallel to the disk surface. It is intended to be attached to.

According to this method, in order to avoid interference between the disk cartridge and the magnetic head arm, a predetermined interval must be provided, and the mounting height of the magnetic head suspension is increased by the thickness of the magnetic head arm. Therefore, it may be an obstacle in making the device thinner.

As shown in FIG. 10, when a positional deviation Xd occurs due to a deviation of the surface of the disk or a deviation in the height of the mounting position, the position of the magnetic head core that moves following the vertical movement in the disk tangential direction. The displacement Xm occurs.

More specifically, when the disk is lowered by -Xd from the standard setting position, the center position of the magnetic head moves in a direction approaching the magnetic head arm side Xm from the standard setting position, and conversely, the disk moves from the standard setting position to Xm. When + Xd is raised, the center position of the magnetic head moves in the direction away from the magnetic head arm side by Xm.

Therefore, it is necessary to increase the dimension of the magnetic head core in the tangential direction shown in FIG. 8 in consideration of the position shift. As a result, there arises a problem that the power consumption and heat generation of the magnetic head increase because the size of the magnetic head core increases.

When the disk is taken in and out, it is necessary to move the magnetic head away from the disk surface. The limit is that the stress at the bending portion of the suspension exceeds the allowable value and plastic deformation occurs. In the case of performing a lifting / lowering operation with one suspension, it has been difficult to take an angle for sufficiently retracting the disk cartridge to a position where the magnetic head does not collide.

The present invention has been made in view of the above problems, and has as its object to provide a magnetic head mechanism and a disk device using the same.

[0025]

Means for Solving the Problems The present invention has the following arrangement to solve the above-mentioned problems.

That is, the magneto-optical disk device of the present invention has an optical pickup unit for condensing a laser beam on the magneto-optical disk, and a magnetic head.
A slider placed in contact with the magneto-optical disk at the position of the condensed laser light so that the magnetic head faces the optical pickup unit at a predetermined distance from the surface of the magneto-optical disk. A moving part, an arm part joined to the optical pickup part and having a wall part substantially perpendicular to the magneto-optical disk, and an elastic member supporting the sliding part and joined to the wall part And so on.

Here, it is preferable that the elastic member is joined to a position at a predetermined distance from an end of the wall, and that the elastic member is bent at a predetermined curvature near the end of the wall. And a magnetic head position correcting unit for moving the sliding portion to a disk tangential method of a magneto-optical disk according to the vertical movement of the sliding portion. .

Further, a restricting member for restricting the fluctuation of the magnetic head position correcting portion is provided at an end of the wall, or the restricting member is formed integrally with the wall. Alternatively, an auxiliary elastic member may be provided at a joint between the elastic member and the wall.

Further, the elastic member may have a torsional rigidity reinforcing portion at a short-side end at a joint portion with the wall portion, and the joint position of the arm portion may be adjusted. The wall portion may have a torsional rigidity reinforcing portion at a short-side end at a joint portion with the elastic member so as to be able to be joined to the optical pickup portion so as to be possible. May be.

The above components can be combined with each other as much as possible.

[0031]

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a configuration diagram of a magnetic head mechanism showing one embodiment of the present invention.

First, in the magnetic head mechanism of the present invention, the configuration of the magnetic head 20, the schematic configuration of the magnetic head 20 and the magnetic head holding portion 25, and the side and top views of the magnetic head mechanism when the disk slides are shown in FIG. The description is omitted because it is the same as that of the prior art.

First, referring to FIG.
Is supported by a spindle motor (not shown). During recording, the sliding surface 26 of the magnetic head holding unit 25 is pressed against the lubricating film 66 of the magneto-optical disk 60 by rotating the elevating lever 70 clockwise. Make contact.

At the time of reproduction and at the time of stop, the magnetic head holding section 25 (including the magnetic head 20) is held in a non-contact manner by rotating the elevating lever 70 counterclockwise.

When the disc cartridge 67 is ejected, the apparatus cover 71 rotates counterclockwise about the rotation shaft 72 of the apparatus cover 71, and the magnetic head holder 25, The disk cartridge 67 can be taken out without interfering with the disk cartridge 67 by employing a structure in which the elastic member 27 and the lift lever 71 are raised upward.

In recording, since the elastic member pressing spring 33 presses the elastic member 27 against the magnetic head arm 27, it is possible to prevent the spring constant of the elastic member 27 from becoming smaller than necessary. .

Further, when the disc is retracted, the clearance between the elastic member 27, the elastic member pressing spring 33 and the apparatus lid 71 is set small because the apparatus lid 71 rotates about the rotation support shaft 72. Therefore, it is possible to prevent the two from interfering with each other, and it is possible to reduce the depth dimension L of the device.

The magnetic head arm 29 and the elastic member 2
By providing a predetermined curvature R at the first bent portion 27-1 of the elastic member 27 on the side 30 near the mounting portion of the elastic member 7, the elastic member 2 at the time of retreating the disk is compared with a case where there is no curvature R.
7, since the maximum stress of the first bent portion 27-1 can be reduced, it is possible to prevent the bent portion from being plastically deformed. Preferably, the predetermined curvature R is r = 0.1
It is desirably about 1.0 mm to 1.0 mm.

Further, the elastic body 27 and the magnetic head arm 2
9, the magnetic head 20 of the present embodiment is integrated.
The position of the magnetic head arm 29 is adjusted as shown in FIG.
After the magnetic head arm is moved on the mounting surface 51 of the optical pickup 50 and the center position of the magnetic head is aligned with the laser spot position of the optical pickup, the magnetic head arm can be fixed with a screw or an adhesive. Compared with the conventional configuration in which 29 is composed of separate components, the number of components can be reduced, the manufacturing process can be simplified, the position of the magnetic head 20 can be easily adjusted, and the durability and reliability can be improved. I can do it. Further, by performing the adjustment on the back surface of the optical pickup 50, there is an effect that the depth dimension L can be reduced.

The magnetic head arm 29 and the elastic member 27
As a joining method, methods such as laser spot welding, caulking, and rivets can be used.

FIG. 2 is a configuration diagram showing a second embodiment of the magnetic head mechanism of the present invention, and FIG. 2 is an enlarged view of a main part of the configuration diagram.

FIG. 2 shows the first bent portion 27 of the elastic member 27.
-1 is provided with an appropriate "play (hereinafter, referred to as a convex portion)". In FIG. 3, (a) shows a state where the magneto-optical disk 60 is at a standard setting position. The elastic member 27 and the magnetic head arm 2 which are the convex portions
The distance of 9 is Xa.

Here, when the magneto-optical disk 60 is lowered by Xd from the standard setting position as shown in FIG. 4B, the elastic member 27 is deformed following the displacement of the disk. The distance of the magnetic head arm 29 is Xb
Becomes

Conversely, even when the magneto-optical disk 60 rises by Xd from the standard setting position as shown in FIG. 3C, the elastic member 27 is deformed following the positional deviation of the disk.
The distance between the elastic member 27 and the magnetic head arm 29 is Xc.

And, between the above Xa, Xb, Xc,
Due to the relationship of Xc>Xa> Xb, when the magneto-optical disk 60 is lifted, the elastic member 27 moves by Xc-Xa from the center position of the magnetic head at the standard setting position, as shown in FIG.
When the magneto-optical disk 60 is moved down as shown by the arrow in the enlarged view of the portion C of FIG. Move to the left as shown in.

As a result, by appropriately setting the spring strength of the elastic member 27, it is possible to suppress the displacement Xm of the magnetic head when the disc position described in FIG. 10 is shifted by ± Xd.

Here, as shown in FIG. 3, the distal end of the magnetic head arm 29 is extended to abut on the elastic member 27, and is restrained from moving further in the direction of the arrow, so that the magnetic head arm 29 can be moved during the seek operation and during the normal feed operation. In addition, it is possible to reduce the torsion of the portion 271 of the elastic member 27 when the magnetic head moves in the radial direction in the state shown in FIG. Alternatively, a similar effect may be obtained by providing a movement restricting member at the tip of the magnetic head arm 29.

As shown in FIG. 4A, the torsion stiffness is improved by partially bending both sides of the elastic member 27 at the part where the elastic member 27 is in contact with the magnetic head arm 29. Alternatively, as shown in (b), by providing the magnetic head arm 29 with a side wall at a position close to the bent portion of the elastic member 27, the rigidity can be further improved.

[0050]

According to the present invention, since the magnetic head mounting surface and the magneto-optical disk surface are substantially perpendicular to each other, the mounting height is increased by the thickness of the magnetic head arm as compared with the conventional substantially U-shaped magnetic head arm. Since it can be reduced, the thickness of the device can be reduced.

Also, at the time of recording, the elastic member pressing spring made of a thin metal piece that restrains the displacement of the elastic member by pressing the elastic member against the magnetic head arm is separated from the magnetic head arm when the disk cartridge is ejected. Due to the deformation, the length of the elastic member 27 when the magnetic head holding portion is retracted to a position where it does not interfere with the disk cartridge can be made longer. Therefore, it is possible to reduce the maximum stress of the elastic member when the magnetic head is retracted, and it is possible to prevent the elastic member from being plastically deformed.

By providing a curvature at the first bent portion where the stress of the elastic member is concentrated when unloading the disk, the stress at the bent portion can be reduced.
Plastic deformation of the elastic body can be prevented.

Also, the elastic member is moved in the disk tangential direction so as to cancel the positional displacement of the magnetic head holding portion in the disk tangential direction which occurs when the magnetic head holding portion moves up and down in accordance with the vertical position shift of the disk. With such a configuration, it is possible to suppress the displacement of the magnetic head due to the vertical movement of the magnetic head holder.

In the state shown in FIG. 2B, the tip of the magnetic head arm is extended to abut on the elastic member as shown in FIG. 3 to restrain the arm from moving further in the direction of the arrow. Accordingly, it is possible to reduce the torsion of the elastic member 271 when the magnetic head moves in the radial direction during the seek and during the normal feed.

Further, the elastic member holding spring 3 is attached to the elastic member 27.
By providing 3, the spring constant of the elastic member 27 can be set appropriately.

The torsional rigidity is improved by partially bending both sides of the elastic member 27.

Also, the elastic member and the magnetic head arm are integrally fixed, and the position of the magnetic head is adjusted on the mounting surface between the magnetic head arm and the optical pickup surface, so that the elastic member and the magnetic head arm are separate members. This makes it possible to reduce the number of parts as compared with the case where the number of parts is small.

Further, by providing the magnetic head arm 29 with a side wall at a position close to the bent portion of the elastic member 27, the rigidity can be further improved.

As explained above, from this,
In order to make the device thinner and smaller, and to prevent the magnetic head from being displaced in the tangential direction even if the position of the magnetic head changes due to disk runout, disc position height deviation, etc. The dimension of the magnetic head core in the tangential direction can be reduced, and as a result, the effects of reducing power consumption and reducing heat generation of the magnetic head can be obtained.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a first embodiment of a magneto-optical disk device according to the present invention.

FIG. 2 is a configuration diagram of a magneto-optical disk drive according to a second embodiment of the present invention.

FIG. 3 is a configuration diagram of a magneto-optical disk drive according to a third embodiment of the present invention.

FIG. 4 is a configuration diagram of a fourth embodiment of the magneto-optical disk device of the present invention.

FIG. 5 is a configuration diagram of a magnetic head.

FIG. 6 is a side view and a rear view of the magnetic head core.

FIG. 7 is a configuration diagram of a magnetic head and a magnetic head holding unit.

FIG. 8 is a configuration diagram of a conventional optical magnetic disk drive.

FIG. 9 is a structural diagram of a magneto-optical disk.

FIG. 10 is an explanatory diagram of a displacement of a magnetic head in a conventional magneto-optical disk device.

[Explanation of symbols]

20: magnetic head, 21: coil, 22: bobbin, 2
3: magnetic head core, 25: magnetic head holder, 26:
Sliding part, 27: elastic member, 28: fixed part, 29: magnetic head arm, 32: joining surface, 33: elastic member pressing spring, 50: optical pickup, 51: magnetic head arm-
Optical pickup mounting surface, 60: magneto-optical disk, 6
1: magneto-optical disk substrate, 62: protective film, 63: magneto-optical recording layer, 64: reflective film, 65: resin protective film, 66: lubricating film, 67: disk cartridge, 70: elevating lever,
71: Device cover, 72: Device cover rotating shaft

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Toshiyuki Tanaka 22-22, Nagaikecho, Abeno-ku, Osaka-shi, Osaka F-term (reference) 5D075 AA03 CF08 EE03 5D119 AA02 AA36 BA01 CA06 MA04 MA05

Claims (9)

[Claims] An optical pickup unit for condensing laser light on a magneto-optical disk, and a magnetic head, wherein the surface of the magneto-optical disk is located at a position of the condensed laser light with the magneto-optical disk interposed therebetween. A sliding portion that is placed in contact with the magneto-optical disk so that the magnetic head faces the optical pickup portion at a predetermined distance from the optical head; A magneto-optical disc device comprising: an arm portion having a wall portion that is substantially perpendicular to the arm; and an elastic member that supports the sliding portion and is joined to the wall portion. 2. The magneto-optical disk drive according to claim 1, wherein the elastic member is joined to a position at a predetermined distance from an end of the wall. 3. The magneto-optical disk device according to claim 1, wherein the elastic member is bent at a predetermined curvature near an end of the wall. 4. The apparatus according to claim 1, wherein the elastic member includes a magnetic head position correcting section for moving the sliding section to a disk tangential method of a magneto-optical disk in accordance with a vertical movement of the sliding section. The magneto-optical disk drive according to claim 1. 5. A method according to claim 1, further comprising a restricting member at an end of said wall for restricting fluctuation of said magnetic head position correcting section, or wherein said restricting member is formed integrally with said wall. 5. The magneto-optical disk drive according to claim 1, wherein: 6. The magneto-optical disk drive according to claim 1, further comprising an auxiliary elastic member at a joint between the elastic member and the wall. 7. The elastic member according to claim 1, wherein the elastic member has a torsional rigidity reinforcing portion at a short end in a joint portion with the wall portion. Magneto-optical disk device. 8. The magneto-optical disk device according to claim 1, wherein the arm is joined to the optical pickup so that a joining position can be adjusted. 9. The wall according to claim 1, wherein the wall has a torsional rigidity reinforcement at a short end thereof at a joint with the elastic member. Magneto-optical disk device.