JPH05325442A - Magnetic storing device - Google Patents

Abstract

PURPOSE:To ultraminiaturize a device, to simplify structure and to stabilize operation. CONSTITUTION:A magnetic head 43 is supported on an arm part 22 so that it can be displaced in simple harmonic oscillation, and the arm part 22 is turnably supported on a substrate 20 by a joint part 23. A motor part 30 turns the arm part 22. By turning the arm part 22, the magnetic head 43 is two- dimensionally moved on a magnetic storing medium 21 and positioned on a specified track.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic storage device.

In recent years, along with the miniaturization of computers, there has been a demand for miniaturization of magnetic storage devices as external storage means of computers.

[0003]

2. Description of the Related Art A conventional magnetic storage device has a structure in which a magnetic disk is rotated by a motor, and it has been difficult to achieve miniaturization.

In order to achieve ultra-miniaturization, the present applicant has previously filed Japanese Patent Application No. 3-238439, entitled "Magnetic Storage Device".
In, the magnetic storage medium is fixedly provided on the substrate, the magnetic head is vibrated by the excitation means, an arc-shaped track is formed, and a U-shaped head support member is slid,
We have proposed a device that moves the magnetic head across the track and positions it on a predetermined track.

[0005]

Each part of the above magnetic storage device can be produced by a micromachining technique using a thin film process, and can be miniaturized.

Positioning of the magnetic head is performed by driving both ends of a gate-shaped head support member at the same time and sliding the head support member.

Therefore, if the driving on both sides is slightly unbalanced, the smoothness of sliding of the head supporting member may be impaired and the head positioning operation may become unstable.

In order to slide the head supporting member, a structural portion that slidably supports the head supporting member in a state where the head supporting member cannot be removed is required, the structure becomes complicated, and it is difficult to make by the micromachining technique.

Therefore, the present invention provides a microminiaturized magnetic storage device in which the magnetic head is moved and positioned by the pivotal movement of the arm portion to stabilize the head positioning operation and improve the accuracy. The purpose is to do.

[0010]

According to a first aspect of the present invention, there is provided a magnetic storage device in which a head reciprocally scans a magnetic storage medium portion on a substrate to form a track for recording and reproduction, and the head is supported. Arm part, a joint part for supporting the arm part on the substrate, and a drive means for reciprocally rotating the arm part around the joint part. The drive means causes the arm part to move the joint part. Is rotated about the center of the track to move the head in a direction crossing the track.

According to a second aspect of the present invention, the joint portion of the first aspect is constituted by a pair of spiral spring portions having one end fixed to the substrate and the other end fixed to the arm portion.

According to a third aspect of the present invention, the driving means according to the first aspect is provided in the joint portion.

[0013]

The structure comprising the arm portion and the joint portion of claim 1 enables stable movement of rotating the arm portion around the joint portion for positioning the head on a predetermined track. Act on.

The spring-shaped spring portion according to a second aspect of the invention functions so that the bearing portion is not required in the joint portion.

The structure in which the driving means of the third aspect is provided in the joint portion works so that the driving means can be small in size.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a magnetic memory device 10 according to a first embodiment of the present invention will be described with reference to FIGS.

FIG. 1 shows an enlarged magnetic storage device 10.

As shown in FIG. 2, the magnetic storage device 10 is incorporated in a housing 11 made of synthetic resin.

FIG. 2 shows the magnetic storage device assembly 12.

The assembly 12 is provided in the housing 11
An LSI incorporating the above magnetic storage device 10, a control circuit for driving and controlling the magnetic storage device 10 and a signal processing circuit for processing signals
The chip 13 is incorporated, the upper surface of the housing 11 is covered with a lid (not shown), and the leads 14 project from the side of the housing 11.

The assembly 12 is handled in the same manner as a general LSI, and the leads 14 are soldered and mounted on a printed board for use.

Next, the structure of the magnetic storage device 10 will be described.

In FIG. 1, 20 is a ceramic substrate.

Reference numeral 21 denotes a magnetic storage medium portion, which is formed integrally with the substrate 20 on the substrate 20 and has a size of several mm square.

Reference numeral 22 denotes an arm portion having a width w ₁ of 0.5 to
It is 1 mm and the thickness t ₁ is 0.2 to 0.5 mm.

The base side 22a of the arm portion 22 is supported on the substrate 20 by a joint portion 23, which is an essential part of the present invention, as shown in an enlarged view in FIGS.

The joint portion 23 is formed on the substrate 20.
Pair of anchors 24_-1, 24 _-2And the arm part 22
Disk portion 25 formed on the lower surface of the anchor and anchor portion 24_-1，
24 _-2And a pair of mainsprings provided between the disc portion 25 and
Spring 26_-1, 26_-2And consists of.

The anchor parts 24 _-1 , 24 _-2 are composed of a disk part 25.
Is arranged on an extension line 27 of one diameter passing through the center O ₁ of the.

One spiral spring portion 26 _-1 has one end fixed to the one anchor portion 24 _-1 , extends one and a half turns counterclockwise in FIG. 3, and the other end of the disc portion 25. It is connected to the surrounding area.

Another spiral spring portion 26 _-2 has one end fixed to another anchor portion 24 _-2 , and the spiral spring portion 26 _-1 extends in the counterclockwise direction for one turn and a half. The other end is connected to the peripheral portion of the disc portion 25.

The material of the spiral spring portions 26 _-1 and 26 _-2 is Si, Al ₂ O ₃ or SiO ₂ .

As a result, the arm portion 22 is supported on the substrate 20 by the elastic force of the spiral spring portions 26 _-1 and 26 _-2 arranged symmetrically.

Further, the arm portion 22 is a mainspring spring portion.
26_-1, 26_-2Elastically deforms the center of the above
O₁Centered on the Z axis 28 passing through the arrow, within an angle range of about 45 degrees
Mark A ₁, A₂Can be rotated in any direction. Arm part 22 times
The moving range is the position P shown by the solid line in FIG.₁Is rotated clockwise
It is the end point, and the position P is shown by the two-dot chain line in the figure.₂Counterclock
It is the end of the direction rotation.

An electromagnetic drive motor section 30 is provided at the joint section 23.

As shown in FIGS. 3, 4 and 5, the electromagnetic drive motor section 30 includes a magnetic field generating coil section 31 radially formed on the substrate 20, and a disk section 2 facing the magnetic field generating coil section 31.
5 and a permanent magnet portion 32 formed radially on the lower surface.

When a driving current flows through the coil portion 31, a rotating magnetic field is generated, and the permanent magnet portion 32 generates a turning force in the directions of arrows A ₁ and A ₂ .

Next, the tip side 22b of the arm portion 22 will be described.

A finger portion 40 is provided on the tip end side 22b of the arm portion 22 so as to extend in a direction orthogonal to the arm portion 22.

At a portion of the finger portion 40 near the base side, the pair of piezoelectric element portions 4 are sandwiched so that the finger portion 40 is sandwiched from the left and right sides.
1, 42 are provided.

As shown in an enlarged view in FIG. 6, a magnetic head 43 having a thin film structure and a magnetoresistive effect element 44 having the same thin film structure are formed at the tip of the finger portion 40.

The magnetic head 43 is used for recording and the magnetoresistive effect element 44 is used for reproducing.

When the piezo elements 41 and 42 repeat expansion and compression in the opposite directions, the finger 40 bends and vibrates in the directions of arrows B ₁ and B ₂ as shown by the chain double-dashed line in FIG.

Next, the operation of the magnetic storage device 10 having the above configuration will be described.

The piezo elements 41 and 42 have a phase of 180.
A sinusoidal signal deviated by ° is continuously applied, the piezoelectric element portions 41 and 42 repeat expansion and compression in reverse, and the finger portion 40 moves as indicated by an arrow B _{1 in} FIG. , B ₂ direction single vibration.

Recording is performed at the time of displacement in the direction of arrow B ₁ ,
An arcuate track 50 _-1 having a width W ₂ of 7 to 8 μm is formed on the magnetic storage medium portion 21 and information is written therein.

Further, the motor section 30 is driven and the arm section 2
2 is rotated about the joint 23 (Z axis 28) in the direction of arrow A ₁ at a constant speed.

As a result, the head 43 causes the magnetic storage medium 2 to move.
As shown in FIG. 1, arc-shaped tracks 50 _-1 to 50 _-n are formed in close proximity to each other on the magnetic storage medium 21 as they move two-dimensionally in the XY direction.

The base of the finger 40 is displaced along the arc locus 51.

Therefore, the arrangement of the arc-shaped tracks 50 is
As a whole, it follows the arc locus 51.

Magnetic head 43 and magnetoresistive effect element 44
The operation of positioning the on the predetermined track is performed as described below.

The finger portion 40 continues to vibrate.
Element 44 continues to read information.

A drive signal is applied to the motor section 30, and the motor section 30 rotates the arm section 22 about the joint section 23. When the element 44 reads the address of the predetermined track, the arm 22 is stopped at the rotation angle position at that time.

As a result, it moves across the tracks 50 _-1 to 50 _-n , is positioned on a predetermined track (track 50 _{-1 in} FIG. 1), and information is written therein by the head 43. Alternatively, the information here is read by the element 44.

The reading of information is also performed on the vibration joint of the finger portion 40 in the direction of arrow B ₁ as in the case of writing.

Further, as can be seen from the above, since the joint portion 23 does not have a bearing portion, it does not wear and has excellent durability.

Further, since the positioning is performed only by rotating the arm portion 22 around the joint portion 23 as described above, the positioning operation is performed more stably and surely as compared with the conventional one. ..

All the parts constituting the magnetic memory device assembly 12 are formed on the ceramic substrate 20 by the micromachining technique using a thin film process.

For example, the magnetic storage medium 21, the magnetic field generating coil portion 31, the anchor portions 24 _-1 , 24 _-2 , the permanent magnet portion 32, the spiral spring portions 26 _{-1 to} 26 _-2 , the disc portion 25, the arm portion 22. Are built in order.

Next, a magnetic memory device 60 according to a second embodiment of the present invention will be described with reference to FIG.

In FIG. 7, parts corresponding to the parts shown in FIG. 1 are designated by the same reference numerals with a subscript A.

Reference numeral 61 denotes a first arm portion, which is a base portion side 61.
a is the joint 23A _-1, is supported on a ceramic substrate 20A, which is rotatable in the arrow C _1, C ₂ direction.

Reference numeral 62 denotes a second arm portion, the base side 62a of which is supported by the joint portion 23A _-2 on the tip end side 61b of the first arm portion 61, and the arrows D ₁ , D
_It can be rotated in _two directions.

Reference numeral 63 designates a third arm portion, the base side 63a of which is supported by the joint portion 23A _-3 on the tip side 62b of the second joint portion 62, and the arrow E ₁ ,
It can be rotated in the E ₂ direction.

A magnetic head 43A and a magnetoresistive effect element 44A are formed on the tip side 63b of the third arm portion 63.

Further, each joint portion 23A _-1 , 23
A- ₂ and 23A- ₃ are electromagnetic drive motor units 30A- ₁ and 30A- ₁ , respectively.
30A _-2 and 30A _-3 are incorporated.

Electromagnetic drive motor sections 30A _-1 , 30A _-2 , 3
0A _-3 is driven at a predetermined speed ratio, the first arm 61 rotates in the direction of arrow C ₁ , the second arm 62 rotates in the direction of arrow D ₁ , and the third arm 63 rotates in the direction of arrow E _2. By moving, the third arm portion 63 moves to the magnetic storage medium portion 21A.
While keeping the turning position with respect to the position shown in FIG.
It is moved linearly in _one direction.

The first to third arm portions 61, 62,
By rotating 63 in the opposite direction to the above, the third arm 63 is linearly moved in the direction of arrow F ₂ .

Further, when the second arm portion 62 rotates with respect to the first arm portion 61, the third arm portion 6
3 is moved in the directions of arrows G ₁ and G ₂ .

As a result, the magnetic head 43A moves two-dimensionally in the XY two-dimensional manner on the magnetic storage medium portion 21A, and on the magnetic storage medium 21, a linear track 70 _{-1 as} shown in FIG.
~ 70- _n are formed close together.

In addition, the third arm portion 63 has arrows G ₁ , G
By moving in _two directions, the magnetic head 43A and the element 44A move across the tracks 70 _-1 to 70 _-n ,
It is positioned at a predetermined position.

Further, since the head 43A and the element 44A move linearly, the following effects can be obtained.

The track 70 can be formed up to the corner of the rectangular magnetic storage medium portion 21A, and thus the magnetic storage medium portion 21A can be effectively used.

Even if the off-track occurs, the reproduced signal does not have the phase shift, and the signal processing is easy.

In each of the above embodiments, the motor unit 3
0, 30A _{-1 to} 30A _-3 can be the structure of the electrostatic motor or the structure of the ultrasonic motor.

When the problem of wear can be solved,
Each of the joint portions 23, 23A- _{1 to} 23A- ₃ may have a bearing portion structure.

[0076]

As described above, according to the first aspect of the invention, the operation of rotating the arm portion around the joint portion is performed more stably and more accurately than the sliding system. Can be positioned on a predetermined track stably and accurately.

According to the second aspect of the present invention, the joint portion can be structured so that there is no fear of wear, and reliability and durability can be improved.

According to the third aspect of the invention, the driving means can be made compact, and the magnetic recording / reproducing apparatus can be made compact.

[Brief description of drawings]

FIG. 1 is an enlarged plan view showing a magnetic memory device according to a first embodiment of the present invention.

FIG. 2 is a perspective view showing a magnetic storage device assembly incorporating the magnetic storage device of FIG. 1 with its lid omitted.

FIG. 3 is a plan view showing an enlarged base side of the arm section in FIG.

FIG. 4 is an enlarged sectional view taken along line IV-IV in FIG.

5 is a perspective view showing the electric drive motor unit in FIG. 4 in an exploded manner.

FIG. 6 is an enlarged view showing a tip of a finger portion in FIG.

FIG. 7 is an enlarged plan view showing a magnetic memory device according to a second embodiment of the present invention.

[Explanation of symbols]

10, 60 Magnetic Storage Device 11 Housing 12 Magnetic Storage Device Assembly 13 ISL Chip 14 Lead 20 Ceramic Substrate 21 Magnetic Storage Medium Part 22 Arm Part 23 Joint Part 24 _-1 , _24-2 Anchor Part 25 Disc Part 26 _-1 , 26 _-2 Spring-shaped spring portion 27 Diameter extension line 28 Z axis 30 Electromagnetic drive motor portion 31 Magnetic field generation coil portion 32 Permanent magnet portion 40 Finger portion 41, 42 Piezo element portion 43 Magnetic head 44 Magnetoresistive effect element 50 _-1 ~ 50 _-n arcuate track 51 locus of the base of the finger section 61 61 first arm section 62 second arm section 63 third arm section 70 _-1 ~ 70 _-n linear track

Claims (3)

[Claims] 1. A magnetic storage medium (21,
21A) is a magnetic storage device that reciprocally scans a portion to form a track for recording and reproduction, and an arm portion (22, 61 to 63) that supports the head.
And a joint part (2) for supporting the arm part on the substrate.
_3, 23A _{-1 to} 23A _-3 ) and drive means (30A, 30A _-1 , 30A _-3 ) for reciprocally rotating the arm portion around the joint portion. Is rotated about the joint portion to move the head in a direction traversing the track. 2. The joint part according to claim 1 is constituted by a pair of spiral spring parts (26 _-1 , 26 _-2 ) having one end fixed to the substrate and the other end fixed to the arm part. Magnetic storage device characterized by. 3. A magnetic storage device, characterized in that the drive means according to claim 1 is provided in the joint (23, 23A _{-1 to} 23A _-3 ) part.