JPH07210914A - Sliding magnetic head for magneto-optical recording - Google Patents

Abstract

PURPOSE:To reduce the size and weight of the head by arranging a sliding part on the inner peripheral side of a recording medium than a head element and providing the sliding part with a prescribed angle of inclination to the traveling direction of the head element in such a manner that the longitudinal direction of the sliding surface is in line with travel of the recording medium. CONSTITUTION:A head body 22 has the sliding part 29 which slides in contact with a disk on the traveling direction A side of the head element 27 existing on the radius of the disk. The sliding part 29 is formed to a linear contact type having an actual contact sliding part 101 and is constituted to incline by an angle phi to the inner peripheral side of the disk in such a manner that its longitudinal direction is in line with the actual sliding direction 40 with respect to the traveling direction A of the head element 27. The component in the perpendicular direction in the longitudinal direction of the sliding part of the impact force of an obstruction acting on the sliding part 29 during sliding and impact force acting at all times thereon is expressed by the quantity multiplied by sin(theta-phi). The force in the longitudinal direction of the sliding part and the force in the perpendicular direction is made small by applying the suitable angle phi of inclination to the sliding part. The force acts advantageously for stability of the posture of the magnetic head.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sliding type magnetic head for magneto-optical recording which slides in contact with a magneto-optical recording medium to perform magneto-optical recording.

[0002]

2. Description of the Related Art One of so-called writable optical disks capable of writing, erasing and reading information by using a light beam is called a magneto-optical disk.

In this magneto-optical disk 1, as shown in FIG. 84, a magneto-optical recording layer 3 made of a perpendicularly magnetized film is provided on a transparent substrate 2 via a SiN protective film 8, and on this magneto-optical recording layer 3. A reflection film 4 made of a metal thin film, for example, an Al thin film is laminated via a SiN protection film 8, and a protection film 5 made of an ultraviolet curable resin or the like is further formed on the reflection film 4.

Magnetic recording methods such as a magnetic field modulation method and an optical modulation method are known as recording methods for a magneto-optical disk.

The magnetic field modulation method enables so-called overwriting in which a new signal is overwritten on an old signal. In this magnetic field modulation type magneto-optical recording, as shown in FIG. 83, an optical pickup which irradiates a laser beam 6 on one side (the substrate 2 side) with a magneto-optical disk 1 having a magneto-optical recording layer of a perpendicular magnetization film interposed therebetween, On the other side (protective film 5 side), a magnetic field generating means that moves in synchronization with the laser spot, that is, a magnetic head 7 is provided, and the direction of the magnetic field is changed by changing the direction of the current flowing through the magnetic head 7.

The magneto-optical disk 1 is rotated at a predetermined rotation speed with its center being the center of rotation.

A magnetic field corresponding to the recording signal is formed in the vicinity of the laser spot 6a, so that the desired rewriting portion 1A of the disk 1 is heated to a Curie temperature or higher by the laser spot 6a and demagnetized, and then the laser spot 6a.
When the magnetic recording medium is moved from the magnetic recording medium to a temperature below the Curie temperature, it is magnetized in the magnetic field direction for recording.

The conventional magneto-optical disk 1 is a non-contact medium, and therefore the magnetic head 7 is arranged at a necessary and sufficient distance d ₀ from the disk 1.

[0009]

The present applicant has previously developed a microminiature digital recording / reproducing device capable of digital recording / reproducing with a microminiature magneto-optical disk. This recording / reproducing device adopts a magnetic field modulation type magneto-optical recording system to enable overwriting.

By the way, since the conventional magneto-optical disk records in a non-contact manner as described above, the magnetic head 7 for magneto-optical recording is subjected to surface wobbling of the disk 1 generated when the disk is rotated away from the disk 1 (disk The electromagnetic servomechanism is attached so as to follow the inclination of No. 1 and the unevenness of the thickness. For this reason, in a recording / reproducing device that employs a non-contact method with respect to a magneto-optical disk, there are limits to reduction of power consumption, downsizing of equipment (particularly to reduce thickness of equipment), and the like.

Therefore, if the magnetic head is made to contact and slide on the magneto-optical disk, the magnetic head need only be supported simply, and the conventional electromagnetic servo mechanism that takes up a large volume can be omitted. This is advantageous in reducing the power consumption of the regenerator and downsizing the device.

On the other hand, when the contact method is adopted, the disk 1
There is a change in shape such as protrusions (humps) on the surface of the disk. When the sliding surface passes through the bumps, the magnetic head jumps by the thickness of the bumps and moves away from the disk surface. It will fall. Therefore, a high output head is required to maintain the recording ability.

Further, the impact on the disk also increases in proportion to the weight of the sliding type magnetic head at this time. If this impact is large, the disc will vibrate, causing defocusing of the optical system. In order to reduce the impact, it is conceivable to reduce the mass of the magnetic head, and therefore to reduce the head itself to make it lighter, but if it is reduced, the head output will decrease and the purpose of using the above high output head Will be contrary to.

In view of the above points, the present invention sufficiently follows the surface wobbling (vertical fluctuation) of the disk and the shape change of the disk surface, can also take measures against external shock, can be made lightweight and compact, and can further reduce the size of the magnetic head. The present invention provides a sliding type magnetic head for magneto-optical recording with improved posture stability.

[0015]

A sliding type magnetic head for magneto-optical recording according to the first aspect of the present invention includes a recording medium 1 on one side of a head element 27 as shown in FIGS. 24, 25 and 26, for example. Has a sliding portion 29 that slides in contact with the recording medium 1. The sliding portion 29 is arranged on the inner peripheral side of the recording medium 1 with respect to the head element 27, and the longitudinal direction of the sliding surface follows the running of the recording medium 1. The head element 27 has a predetermined inclination angle ψ with respect to the traveling direction.

In the sliding type magnetic head for magneto-optical recording according to the second aspect of the present invention, for example, as shown in FIG. 26, the head main body 22 having the sliding portion 29 that slides in contact with the recording medium 1 has the leaf spring material 23. And the supporting position of the head main body 22 is displaced from the center line of the leaf spring material 23.
55A and 55B on both sides sandwiching the head main body 22 of
The widths M _A and M _B are asymmetrical. That is, when the mounting position of the head main body 22 is displaced toward the inner peripheral side of the recording medium 1, the width M _B of the inner peripheral spring portion 55B is made larger than the width M _A of the outer peripheral spring portion 55A.

[0017]

In the sliding magnetic head for magneto-optical recording according to the first aspect of the present invention, the sliding portion 29 for sliding contact with the recording medium 1 is provided on one side of the head element 27. Compact and lightweight. Then, the sliding portion 29 is arranged on the inner peripheral side of the recording medium 1 with respect to the head element 27, and a predetermined direction is set with respect to the traveling direction of the head element 27 so that the longitudinal direction of the sliding surface follows the traveling of the recording medium 1. By forming the recording medium with the inclination angle ψ, the probability that the shape of the recording medium surface changes, for example, the obstacle 16 such as a bump hits the sliding portion 29 becomes small. At the same time, the component of the impact force at the time of a collision in the direction perpendicular to the longitudinal direction of the sliding portion is reduced, the amount of positional deviation of the magnetic head is reduced, and the posture stability of the magnetic head is improved.

In the sliding magnetic head for magneto-optical recording according to the second aspect of the present invention, the head main body 22 having the sliding portion 29 that slides in contact with the recording medium 1 is supported by the leaf spring material 23. The magnetic head can be made smaller and lighter, and it can cope with surface wobbling of the recording medium and changes in the shape of the recording medium surface, and can withstand external impact. In this magnetic head, when the supporting position of the head body 22 is displaced from the center line of the leaf spring material 23, the widths M _A of the spring portions 55A and 55B on both sides of the leaf spring material 23 that sandwich the head body 22 are By making M _B asymmetric, the left and right spring parts 55A and 55B when the head body 22 is brought into contact with the recording medium 1
The balance of the spring pressure is compensated, and the recording medium 1 can be slid on the recording medium 1 in a stable posture.

[0019]

Embodiments of the sliding magnetic head for magneto-optical recording according to the present invention will be described below with reference to the drawings.

1 and 2 show an example of a magnetic head which is the basis of the present invention. In this magnetic head 21,
The head main body 22, a thin leaf spring material 23 that presses the sliding portion 29 against the disk surface 1a, and a fixed body (that is, a head arm) 24 to which the leaf spring material 23 is attached have one end of the leaf spring material 23. Is attached and fixed to the fixed body 24, and the head main body 22 is attached to the other end side.

As shown in FIGS. 4 and 5, the head main body 22 includes a substantially E-shaped ferrite magnetic core 25 composed of a central magnetic pole core 25A and a side magnetic pole core 25B.
5A, a magnetic head element 27 formed by mounting a bobbin 41 around which a coil 26 is wound is formed.
7 is integrally formed on one side of a sliding portion 29 of the sliding body 28 that directly slides in contact with the magnetic disk 1.

The bobbin 41 has flange portions 42A and 42B at both upper and lower ends made of, for example, liquid crystal polymer, and penetrates both flange portions 42A and 42B to form an E-shaped magnetic core 2.
5 is provided with a through hole 43 into which the central magnetic core 25A is inserted, and a pair of terminal pins 44 made of, for example, nickel silver are drawn out on one side of the upper flange portion 42A with the through hole 43 sandwiched therebetween. A derivation unit 45 is provided and configured.

As shown in FIGS. 6A and 6B, the sliding body 28 is formed by injection molding of a resin having a low friction coefficient, and the sliding portion 29 and the mounting recess 30 of the magnetic head element 27 are provided on one side thereof. The sliding portion 29 is formed so that the thickness t ₁ thereof is thinner than the thickness t ₂ of the head element 27 on the side of the mounting portion 31 and the head element 27 on the side of the mounting portion 31 faces. The surface is formed so as to recede from the sliding surface of the sliding portion 29 by a minute distance d ₂ .

The sliding portion 29, when viewed from the cross-sectional direction,
The lower surface forms a circular arc surface, and when viewed from the longitudinal section (cross section in FIG. 6B), a sliding surface is formed such that the lower surface has flat surface 33 and curved surface 34 on both sides sandwiching the flat surface 33.
Therefore, when the sliding portion 29 is in contact with the surface of the disk 1, line contact is made.

The mounting recess 30 located on one side of the sliding portion 29 has a substantially cross-shaped opening so that the upper surface of the mounting recess 30 partially faces the back surface of the magnetic core 25 of the head element 27 and the terminal pin 44 of the bobbin 41 faces. 46 is provided.

The magnetic head element 27 is mounted in the mounting recess 30 of the sliding body 28 to form the head body 22.

Since the material used for the sliding body 28 is required to have good slidability, not to be charged, and to be lightweight, it is particularly high molecular polyethylene or the like, or carbon is contained therein (for example, 8% by weight). %), And other plastic materials described later can be used.

It should be noted that step portions 47 are provided at both ends of the back surface of the magnetic core 25, and the length L ₁₀ of the opening 46 facing the magnetic core on the upper surface of the mounting recess 30 is greater than the length L ₁₁ of the magnetic core 25 by a step. By forming the magnetic head element 27 to be short, the magnetic head element 27 can be easily mounted and positioned, and the outer surface of the sliding body 28 and the back surface of the magnetic core 25 can be flush with each other.

Further, the mounting recess 30 may be formed such that its central axis X ₁ is displaced from the central axis X ₂ of the sliding body 28, as shown in FIG. 6A. The reason for this will be made clear later.

An attachment portion 48 for attaching the head body 22 to the tip side of the leaf spring material 23 is integrally provided on the upper surface of the sliding portion 29. The mounting portion 48 is formed on the pedestal 50 that is in contact with the surface of the leaf spring member 23 on the tip side.

The head main body 22 of this example has the magnetic core 2 of the head element 27 with the sliding portion 29 in contact with the disk 1.
The end surface of No. 5 is separated from the disk surface by a minute distance d ₂ .

On the other hand, the leaf spring material 23 is, for example, SUS30.
4, a thin plate such as BeCu or a tension-annealing material, such as Beno, etc., and as shown in FIG. 7 and FIG.
And a first spring system (springiness imparting portion) 53 for extending the inclination of a predetermined angle θ ₁ to follow the surface runout of the disk 1 and for giving a total weight. ,
An inclined portion 54 extending from the first spring system 53 so as to be inclined at a predetermined angle θ _{2, and a second} spring extended from the inclined portion 54 to follow a change in the surface shape of the disc 1 such as a hump. System (springness imparting part) 55 and second spring system 55
The third spring system 56 having a gimbal function extending to the opposite side, that is, the mounting portion 52 side, and the tip of the second spring system 55 are bent and extended upward at a substantially right angle or an angle close to the tip of the second spring system 55, and further, a free end. Is integrally formed with a locking portion 57 that is bent outward at a substantially right angle or at an angle close to that. Although not shown, similar to an opening 160 in FIG. 29, which will be described later, an opening is also provided in the vertically bent portion of the locking portion 57 for weight reduction.

The mounting portion 52 of the leaf spring 23 is formed in a planar shape having a plurality of positioning holes 52a. First spring system 5
Reference numeral 3 is a flat plate-like body having an opening 58 formed in the center thereof, and its side plate portions 52A and 53B are provided with spring properties, and are formed in a curved shape as a whole.

The inclined portion 54 is formed with ribs 60 which are bent at right angles on both sides thereof. The second spring system 55 extends from both sides of the inclined portion 54 through the constricted portion 61 at the boundary with the inclined portion 54, that is, a pair of flat plate shapes parallel to each other across the space 63 in the same plane. It is formed with the spring parts 55A and 55B. Further, the third spring system 56 is formed so as to extend from the inner side of the tip of the second spring system 55 into the space 63 between the spring parts 55A and 55B, and the end part thereof is fitted into the mounting part 48 of the head main body 22. A matching positioning hole 62 is provided.

In the leaf spring member 23, the first spring system 53 for surface wobbling and the second spring system 55 for hump are mutually ribbed 6 with each other.
Operatively separated by a 0 reinforced ramp 54,
Further, the second spring system 55 and the third spring system 56 are operatively separated from each other and can operate independently.

As shown in FIGS. 9 and 10, the fixed body 24 is made of metal such as iron, steel, SUS304, Al, etc., and has a mounting portion 70 for fixing the mounting portion 52 of the leaf spring material 23. Stopper 73 that extends asymmetrically
And. That is, as will be apparent later, it extends from one side corresponding to the inner peripheral side of the disc 1 and has a predetermined length, that is, a length from the mounting portion 52 of the leaf spring member 23 to the middle of the inclined portion 54, which is approximately the same. An arm portion 71 that inclines over the length from the same length to the engaging portion 57 of the leaf spring material 23 with a predetermined inclination angle θ ₃ and a right angle so as to face the mounting portion 70 from the tip of this arm 71. Bent stopper piece 7
And 2 are integrally formed. The arm portion 71 and the stopper piece 72 constitute a stopper portion 73.

In this case, the inclination angle θ ₃ of the fixed body 24 is smaller than the inclination angles θ ₁ and θ ₂ of the leaf spring member 23 (θ ₃ <θ ₂ <θ
It is set to ₁ ).

The fixed body 24 can be formed by punching press working with the above metal material. The fixed body 24 is
It can be formed by injection molding, and the material in this case is polyphenylene sulfide (PPS), polyacetal (POM), polyarylate (PAR), acrylonitrile-butadiene styrene copolymer (ABS).
Etc., or those containing carbon, etc. can be used.

The mounting portion 52 of the leaf spring member 23 is fixed to the mounting portion 70 of the fixed body 24 by means such as laser welding or spot welding while the positioning hole 52a is engaged with the positioning protrusion 70a of the fixed body 25. To be done.

In this state, the second spring system 5 of the leaf spring material 23 is
An engaging portion 57 which is bent and extended from the tip of 5 is engaged with the stopper piece 72 at the tip of the arm of the fixed body 24 so as to be hooked. Thereby, the inclination angle θ ₁ of the leaf spring member 23,
Due to the difference between θ ₂ and the inclination angle θ ₃ of the arm 71 of the fixed body 24, the leaf spring member 23 is set to the first and second spring systems 53 and 55.
The stopper piece 72 is locked so that a predetermined restoring force remains. That is, the first and second spring systems 53 and 55 are precharged with a predetermined spring pressure.

Next, the third spring system 56 of the leaf spring material 23 is used.
The mounting portion 48 of the head main body 22 is inserted into the positioning hole 62, and the mounting portion 48 is welded to mount the head main body 22 to the leaf spring member 23. A plurality of slits 62a in the hole 62
By providing the above, the welding is ensured.

Here, the head main body 22 is formed so that the center of gravity P exists between the sliding portion 29, particularly the position where it directly contacts the disk, and the middle of the head element 27, especially its central magnetic core 25A (FIG. 2). reference).

The head main body 22 is mounted in the end portion of the third spring system 56, and in the space 63 between both spring portions 55A and 55B of the second spring system 55 corresponding to the head element 27 side bumps. Will exist. Then, in use, the spring portions 55A, 55 of the second spring system 55 corresponding to the bumps are provided.
B is the axis Y ₁ (that is, the hump 1
(Corresponding to the rotation center axis of the head body 22 when the head body 22 collides with 6) or in the vicinity thereof, the head body 2
It is desirable to support 2. Therefore, the head body 22
Will be supported so as to vertically extend across the surface formed by the spring portions 55A and 55B.

On the other hand, the head body 2 including the leaf spring material 23
The frequency of natural vibration No. 2 is set so as to be removed from the equivalent frequency of the hump on the disk surface when the disk 1 slides and the frequency of natural vibration of the disk itself, that is, lower than these frequencies.

Therefore, for example, the resonance frequencies of the three independent spring systems 53, 55 and 56 of the leaf spring material 23 are set so as to satisfy the above conditions.

Here, the equivalent frequency of the hump is defined as the maximum amplitude frequency component generated by the hump when the change in the height of the disk 1 moving at the linear velocity used is expressed by the frequency.

The flexible wiring cable 81 for leading out the coil terminal is, for example, as shown in FIG.
A bobbin terminal pin 44 in which a connecting portion (that is, a round portion) at each end of a book wiring (not shown) is projected on the upper surface of the sliding body 28.
Insert and connect. The flexible wiring cable 81 is laid on the arm 71 of the fixed body 24, and a locking hole provided on the flexible wiring arm 81 is inserted into the locking portion 82 on the base side of the arm 71 for positioning.

Next, the function and effect of the magnetic head 21 will be described.

In the free state where the magnetic head 21 does not come into contact with the disk surface, the head main body 22 is held so that the third spring system 56 is below the second spring system 55 as shown in FIG. 11A. It Next, when the head body 22 is in contact with the disk surface 1a, the third spring system 56
And the sliding portion 29 of the head main body 22 follows the disk surface 1
After contacting a and parallel to the disk surface, the locking portion 57 of the leaf spring material 23 separates from the stopper piece 72 of the fixed body 24 and the head main body 22 slides on the disk surface 1a with a predetermined weight. (See FIG. 11B).

The head body 22 is within the permissible range of the surface runout of the disk 1 by the first spring system 53 of the leaf spring material 23 (for example, in the case of a 64 mm ultra-small magneto-optical disk, the allowable range of the surface runout is ± 0). The second spring system 5
5 corresponds to the hump 16 (see FIG. 12) of the disk surface 1a, and the third spring system 56 has a function similar to that of a so-called gimbal so that the surface runout of the disk 1 is followed.

The leaf spring material 23 is fixed to the fixed body 24 in advance.
Since a predetermined spring pressure is applied by the stopper piece 72 extending from the above, even if the head main body 22 changes up and down due to the surface wobbling of the disk 1, the fluctuation of the applied pressure to the disk surface 1a of the head main body 22 is small. The pressing force can be set to a substantially constant value within the allowable range of surface runout.

In the present magnetic head 21, the head element 27 is retracted from the sliding surface of the sliding portion 29 by the distance d _2, so that even if there is a change in the shape of the hump 16 or the like on the disk surface 1a. The hump 16 passes through the gap between the head element 27 and the disk 1.

Further, as shown in FIG. 12, the head body 2
Since the center of gravity P of 2 exists between the head element 27 and the sliding portion 29, when the disk surface 1a changes in shape such as the hump 16, the hump 16 passes between the head element 27 and the disk surface 1a. When it hits the end of the sliding portion 29, it rotates in the clockwise direction in FIG. 12 about the center of gravity P, and the head element 27 approaches the disk surface 1a. Therefore, the recording ability is improved.

At the same time, when sliding, the equivalent weight of the head main body 22 as viewed from the hump 16 is reduced, the impact on the disk 1 is weakened, and the adverse effect on the optical pickup system can be reduced accordingly.

Further, as described above, even when the shape of the disk surface 1a is changed, the head element 27 does not jump but comes closer to the disk surface, so that a large magnetic head having high recording capability is required. Instead, it is possible to reduce the mass of the magnetic head and form it lighter. Therefore, even if an external impact is applied, the impact on the disk 1 can be reduced and the so-called external impact can be sufficiently endured. In this embodiment, the weight of the head body can be reduced to about 30 mg to 40 mg as described later, and
It can withstand an external impact of 0G (gravity).

Three spring systems 53, 55 and 5 of leaf spring material
Since the frequency of the natural vibration of the head body 22 including 6 is removed from the equivalent frequency of the hump 16 on the disk surface and the frequency of the natural vibration of the disk itself when the disk 1 is sliding, The magnetic head can be stably driven without causing resonance.

The protective film 5 of the disk 1 is formed by spin coating, but there is a raised portion in the peripheral portion. In order to increase the recording density, it is desirable to record to the very end of the disk 1.

In the present magnetic head 21, as shown in FIG. 6, the head element 27 is arranged so that its center line x ₁ is displaced to one side from the center line x _{2 of the} sliding member, so that the head element 27 is located around the disk. Even if it is close to the rising part of
The sliding portion 29 makes line contact sliding on a flat surface apart from the raised portion. Therefore, high density recording becomes possible.

Since the second spring system 55 corresponding to the hump 16 is provided so as to operate independently of the first spring system 53 for surface wobbling, when the hump 16 collides with the hump 16, the influence on the disc 1 is affected. Can be made smaller.

By disposing the second spring system 55 for dealing with the hump so as to pass through the axis Y ₁ through which the center of gravity P of the head main body 22 penetrates or in the vicinity thereof, the center of gravity P when the head main body 22 collides with the hump 16. The rotation axis (that is, the axis that passes through the center of gravity) Y ₁ that rotates around the center of the axis can be matched with the operation support axis of the spring, and an ideal operation can be realized.

The second spring system 55 and the inclined portion 5 for dealing with the hump
By providing the constricted portion 61 between the plate spring member 4 and 4, the stress is concentrated on the constricted portion 61, and the leaf spring material 2 during operation is
The peculiar squeaking of 3 can be prevented.

Further, the present magnetic head 21 has the following operational effects as compared with the sliding type magnetic head for magneto-optical recording proposed in Japanese Patent Application No. 4-23964.

The previously proposed magnetic head 83 is constructed as shown in FIG. 13A. Reference numeral 87 denotes a leaf spring material, which includes an inclined portion 85 having a rib extending from the first spring system 84 at a predetermined angle and extending, and a second spring system 86 extending from the inclined portion 85. One end of the leaf spring material 87 is fixed to the fixed body 88, and the stopper 89 from the fixed body 88 is brought into contact with the inclined portion 85 so that the first spring system 84 is precharged with a predetermined spring pressure. . Then, the second spring system 8
The head main body 22 is supported at the tip of 6 via a gimbal. In this magnetic head 83, the first spring system 84 follows within the permissible range of the surface runout of the disk 1 and gives a total weight, and the second spring system 86 of the disk 1 such as the hump 16 or the like. Corresponds to changes in surface shape.

FIG. 13B shows the magnetic head 21. Comparing the two magnetic heads 21 and 83, first, when the magnetic head 21 is inserted / removed into / from the device body of the cartridge containing the disk (so-called eject), for example, the base of the fixed body 24 is rotated. The distance dimension for separating the head main body 22 from the cartridge, that is, the distance from the position in use to the position in non-use, that is, the so-called flip-up size becomes small.

That is, in the case of the magnetic head 83 of FIG. 13A, the predetermined spring pressure is precharged only by the first spring system 84, and the second spring system 86 is in a free state, so that it is in use. The sliding portion 29 of the head body 22 is attached to the disk
The head main body 22 is pushed in to obtain the pressing force in use after the second spring system 86 is contacted with the stopper portion 89.
When the head main body 22 is pushed in, the spring pressure gradually increases until the leaf spring member 87, that is, the inclined portion 85 thereof, separates from the Stoch portion 89 when the head main body 22 is pushed in. After the distance increases from the stopper portion 89, the amount of change in spring pressure is small even if the amount of pushing is increased, and the amount of spring pressure increases slightly.

On the other hand, in the present magnetic head 21, the first
The second spring system 55 as well as the second spring system 53 is precharged with spring pressure, so that the sliding portion 29 of the head main body 22 comes into contact with the disk 1 during use, and then the head main body 2
The distance from the moment when the second spring system 55 is pushed away from the stopper piece 72 by pushing 2 (the pushing amount of the head main body at which the pressing force is obtained in the use state) becomes small. As a result, the head flip-up dimension is reduced.

FIG. 14 is a diagram comparing the height position of the main magnetic head 21 when not in use with the height position of the previously proposed magnetic head 83 of FIG. 13A. The difference in height between them is Δh. Occurs. When applied to the above-mentioned ultra-compact digital recording and reproducing device, the height difference Δh between the magnetic head 21 and the previously proposed magnetic head 83 of FIG. 13A is about 1 mm, and the device can be made thinner accordingly.

Next, in the magnetic head 83 of FIG.
The head main body 2 fixed to the second spring system 86 at the time of flipping up because only the spring system 84 of the
There was a wrinkle that caused a wobble in 2. It is necessary to increase the flip-up dimension with a margin to the extent of this fluctuation. However, in the magnetic head 21, a so-called second spring system 55 near the head main body 22 is supported.
Since the tip of the head is locked to the stopper piece 72 via the locking portion 57, it is possible to suppress the fluctuation of the head body 22. It is not necessary to take a margin for the flip-up dimension for the fluctuation, and the flip-up dimension can be kept small.

Further, in the magnetic head 83 of FIG. 13A, when the head body 22 is pushed into contact with the disk 1 during use, the second spring system 86 of the second spring system 86 is formed in the gimbal portion supporting the head body 22. Following the angle of the side of the gimbal, the moment of rotation m _{1 in the} direction of the arrow in FIG. 15A acts near the attachment portion of the gimbal portion to the second spring system 86, and the stress concentration point Q _{1 of the} head body 22 on the disk _{1 is applied.} Is on the head element side of the sliding portion 29. Therefore, the sliding portion 29 of the head main body 22 comes into contact with the surface of the disk 1 in the traveling direction A of the disk 1.

On the other hand, since the magnetic head 21 is provided with the third spring system 56, when the head main body 22 is pushed in, the stress concentration point Q ₂ slides as shown in FIG. 15B. It comes to the tip of the moving part 29, and the rotational moment m _{2 in the} opposite direction acts. Therefore, the head main body 22 feels like the front of the head is lifted up with respect to the traveling direction A of the disk 1, and stick slip can be prevented.

On the other hand, this type of contact sliding magnetic head comes into contact with the magneto-optical disk 1 housed through the window 92 of the cartridge 91 shown in FIGS. Therefore, the magnetic head must not hit the cartridge 91. In the case of the above-mentioned 64 mm magneto-optical disk 1, the head main body 22 in the window 92 of the cartridge 91 is 14.5 mm to 31.0 mm in the radial direction.
Move up to. Center of head core and window 92 of cartridge
The margin size is x ₁ = 2.5m on the outer peripheral side.
m, x ₂ = 4.0 mm on the inner peripheral side. Since the window edge has the step 94 on the inner peripheral side, the allowance x ₃ of the arm 71 of the magnetic head can be 5.5 mm. According to the magnetic head 21 described above, the arm 71 is arranged only on one side of the magnetic head 21 (that is, on the inner peripheral side of the disk 1). It can be moved from 14.5 mm to 31.0 mm.

Further, by making the flexible wiring cable 81 crawl on the arm 71, the spring characteristic of the leaf spring member 23 is not changed.

18 and 19 are other examples related to the present invention. In this example, the second spring system 55 described above is used.
Instead of the locking portion 57 formed at the tip of the third spring system 5
An engaging portion 59 is formed at the tip of 6, and the engaging portion 59 is engaged with the stopper piece 72 by hooking. Since other configurations are the same as those in FIGS. 1 and 2, corresponding parts are denoted by the same reference numerals and detailed description thereof will be omitted.

In the magnetic head 96 having this structure, in addition to the above-mentioned first spring system 53 and second spring system 55, a third head system 53 is provided.
The spring system 56 is also precharged with the spring pressure while being locked to the stopper piece 72, and in principle, a predetermined pressing force can be obtained from the moment when the head body 22 is brought into contact with the disk 1 during use. Therefore, the head flip-up dimension is further smaller than that of the magnetic head 21 of FIG. 1, and further thinning can be achieved. Other than that, the same operational effects as in FIG. 1 are obtained.

In FIGS. 1 and 18 and FIG. 32 described later, the arm 71 is provided only on one side to form the stopper piece 72, but as shown in FIG. It is also possible to configure the magnetic head 97 in which the arms 71 are formed from both sides of the fixed body 24 and the stopper pieces 72 are provided so as to extend the tips of both arms 71.

By the way, in the sliding type magnetic head for magneto-optical recording, the sliding portion 29 is located adjacent to the running direction side of the head element 27 and the sliding portion 29 is the head because of its attitude stability. It is desired to be a so-called line contact type having a longitudinal direction close to the traveling direction or a multi-point contact type in which contact points are arranged in the same direction.

In this case, since the head element 27 must be located on the radius of the disk 1, the sliding portion 29 is arranged slightly displaced from the radius of the disk 1. Here, when the longitudinal direction of the sliding portion 29 is in the same direction as the running direction of the head element 27, the frictional force due to the rotation of the disk 1 during sliding and the impact force on the head main body 22 due to the obstacle on the disk 1 are The component of the sliding portion 29 in the direction crossing the longitudinal direction becomes large. Therefore, the following problems occur.

(1) The probability that an obstacle such as the bump 16 on the surface of the disk 1 collides with the head main body 22 is increased. (2) In particular, the impact force at the time of collision has a large component in the direction perpendicular to the longitudinal direction of the sliding portion 29, and the significance of the magnetic head with respect to the posture stability is reduced. (3) The frictional force constantly acting on the sliding portion 29 also has a large component in the longitudinal direction of the sliding portion 29 and in the direction perpendicular to the frictional force.
The force in the twisting direction is larger than that of 2. This is disadvantageous in positioning the head element 27.

Further, this point will be described with reference to the drawings. FIG. 21 shows an outline of the head main body 22 in which a sliding portion 29 for sliding contact with the disk 1 is adjacent to the running direction A side of the head element 27 (this is the tangential direction of the disk rotation direction). The sliding part 29 is a line contact type having an actual contact sliding part 101 that actually contacts the disk 1 or a multi-point contact type in which contact points are arranged in one direction, in this example a line contact type, and its length is The direction and the traveling direction of the head element 27 existing on the radius coincide with each other.

FIG. 22 shows that when the head element 27 of the head body 22 slides on the disk 1 at the position of the radius r,
The contact range d in the radial direction on the disk 1 along which the actual contact sliding portion 101 slides is shown. d is equal to the difference between the distance between both ends of the actual contact sliding portion 101 and the rotation center O, that is, r ₂ −r ₁ .

Here, if the density of obstacles on the disk 1 that influences the sliding portion 29 is uniform, the larger the width of d, the greater the probability that the sliding portion 29 will be affected by the obstacle. It is clear that

Further, in the longitudinal direction of the actual contact sliding portion 101,
The deviation angle θ _{10 in the} actual sliding direction 102 depends on the distance L of the actual contact sliding portion 101 from the center of the head element, and θ ₁₀ = tan ⁻¹ (L
/ R), it changes as shown in FIG.

FIG. 23 shows the relationship between θ ₁₀ and L at both ends when the actual use radius r of the microminiature magneto-optical disk 1 is 16 mm to 31 mm. Curve I is for r = 16 mm and curve II is for r = 31 mm.

As shown in FIG. 16, the size of L is defined by the size W / 2 of the window 92 of the cartridge 91 of the disk 1, and W / 2 cannot be 8.5 mm or more. . On the other hand, the lower limit of L cannot be about 1.5 mm or less because the sliding portion 29 is adjacent to the head element 27 in the traveling direction as shown in FIG.

Here, the impact force due to the obstacle or the frictional force constantly acting is sin θ with respect to the deviation angle θ ₁₀ .
_Ten minutes acts in the direction perpendicular to the longitudinal direction of the sliding part. These forces are unfavorable for the posture stability of the entire head body 22, but become larger as θ ₁₀ becomes larger.

FIG. 24 is a schematic view showing an embodiment of the magnetic head according to the present invention, in particular, the head body 22 thereof, in which the above problems are improved.

The head main body 22 of this embodiment has a sliding portion 29 for sliding contact with the disk 1 on the running direction A side of the head element 27 located on the radius of the disk 1 similarly to the head main body 22 of FIG. To have. In this example, the sliding part 29 is formed as a line contact type having the actual contact sliding part 101 or a multi-point contact type in which contact points are arranged in one direction, and in this example, the line contact type is formed. The disk 1 is formed so as to be inclined toward the inner peripheral side of the disk 1 by an angle ψ so that the longitudinal direction is along the actual sliding direction 104 with respect to the traveling direction A of the head element 27.

FIG. 25 shows the range d'of the sliding radius on the disk 1 when the magnetic head 22 of this embodiment slides on the disk 1 at the position of the radius r ', in comparison with FIG. It is a thing. In this embodiment, the width of d'is as shown in FIG.
It can be smaller than the width of d at 2. Therefore, there is an inclination angle ψ of the sliding portion that can reduce the probability that an obstacle on the disk 1 affects the sliding portion 29.

On the other hand, tilting the sliding portion 29 by the angle ψ along the actual sliding direction 104 is nothing but shifting the vertical axis by the angle ψ in the positive direction in FIG. That is,
The component of the impact force of the obstacle acting on the sliding portion 29 during sliding and the frictional force constantly acting in the direction perpendicular to the longitudinal direction of the sliding portion is represented by the amount multiplied by sin (θ ₁₀ −ψ). Be done. By giving an appropriate inclination angle ψ with respect to the angle θ ₁₀ which always takes a positive value, it is possible to reduce the force in the longitudinal direction of the sliding portion and the vertical direction. This has an advantageous effect on the posture stability of the magnetic head.

The value of the inclination angle ψ of the sliding portion 29 is 16 mm to 31 mm for the actual use radius of the ultra-small magneto-optical disk and the distance L from the head element center of the sliding portion 29 as described above, and the value of the window of the cartridge. Size W / 2 is 1.5 mm to 8.5 m
Considering m, the shaded area in Fig. 23 or θ ₁₀ = tan
^{From -1} (L / r), it can be 3 degrees or more and 28 degrees or less.

By thus tilting the sliding portion 29 with respect to the head element 27 along the actual sliding direction, the probability that an obstacle on the disk surface will collide with the head body 22 can be reduced. . Further, since the component of the impact force at the time of collision in the direction perpendicular to the longitudinal direction of the sliding portion can be reduced, it is possible to maintain the significance of the posture stability of the head main body. Further, since the component of the frictional force at the time of sliding in the direction perpendicular to the longitudinal direction of the sliding portion can be reduced, the force that attempts to twist the head body 22 can be suppressed. This leads to a reduction in the amount of displacement of the head element 27.

26 to 28 show the head element 27 described above.
On the other hand, another embodiment of the specific magnetic head of the present invention using the head main body 22 in which the sliding portion 29 is inclined along the actual sliding direction will be shown.

28A and 28B show the head main body 22.
Indicates. The head main body 22 is provided with a slide body 113 integrally having a sliding portion 29 inclined by a predetermined inclination angle ψ on one side of the mounting portion 31 on which the head element 27 is mounted. A magnetic head element 2 in which a coil is wound around a central magnetic pole core of a similar substantially E-shaped ferrite magnetic core.
It is configured by mounting 7.

The sliding portion 29 of the head body 22 is of a so-called multi-point contact type having contact surfaces 112a for sliding contact with the disk 1 at two ends in the longitudinal direction thereof. A space between both contact surfaces 112a of the sliding portion 29 is formed so as to be flatly recessed inward. Both contact surfaces 112a can be formed in a cylindrical shape or a spherical shape, for example.

Then, in this example, FIG. 26 and FIG.
As shown in FIG. 7, the head main body 22 in which the sliding portion 29 is inclined by ψ, the thin leaf spring material 23 that presses the sliding portion 29 against the disk surface, and the fixed body 24 to which the leaf spring material 23 is attached are attached. The leaf spring member 23 has one end attached to and fixed to the fixed body 24, and the head body 22 is attached to the other end side.

The leaf spring material 23 and the fixed body 24 are constructed in the same manner as described above with reference to FIGS. That is, although the detailed description is omitted, the fixed body 24 includes a mounting portion 70 for fixing the mounting portion 52 of the leaf spring member 23, an arm portion 71 asymmetrically extending from one side thereof, and a tip of the arm portion 71. It is integrally formed with a stopper piece 72 that is bent at a right angle so as to face the mounting portion 70 more.

The leaf spring member 23 has a first spring system 53 and an inclined portion 54 having a rib extending from the first spring system 53.
A second spring system 55 extending from the second spring system 55, a third spring system 56 extending to the opposite side of the second spring system 55, that is, the mounting portion 52 side, and a vertical direction from the tip of the second spring system 55. It integrally has a locking portion 57 that is bent and extended in the direction. The head main body 22 is supported on the third spring system 56 by welding via the mounting portion 48. Then, the locking portion 57 at the tip of the second spring system 55 is locked by being hooked on the stopper piece 72 so that the spring pressure of the leaf spring material 23 is precharged.

FIG. 29 is a development view of the leaf spring material 23 used in this example, and it is shown in FIG.
6 and the leaf spring material 23 shown in FIG. 160,
161 is an opening.

Here, since the sliding portion 29 of the head main body 22 is formed so as to be inclined with respect to the head element 27 by ψ, in order to fit the head main body 22 in the space 63, the center of the leaf spring material 23 is required. 26, the position of the sliding portion 29 of the head main body 22 shifts to the arm 71 side as shown in FIG. Therefore, when the sliding portion 29 is brought into contact with the disk surface, the second
The force applied to the spring portions 55A and 55B of the spring system 55 is strong in the spring portion 55B closer to the sliding portion 29 and weak in the far spring portion 55A. As a result, the spring portions 55A and 55B are
The balance of B is lost and the head main body 22 is tilted or the like.

Therefore, in the second spring system 55, the widths M _A and M _B of the two spring portions 55A and 55B are made different. That is, the width M _B of the spring portion 55B on the disk inner peripheral side where the sliding portion 29 is inclined is set to be equal to the spring portion 5 on the disk outer peripheral side.
It should be larger than the width M _{A of} 5 _A. With this structure, when the sliding portion 29 is brought into contact with the disk 1, the second
The balance of the spring pressures of the left and right spring portions 55A and 55B of the spring system 55 is compensated, and the head main body 22 can be slid in contact with the disk 1 in a stable posture.

30 and 31 show the head element 27, respectively.
Another example of the bobbins 119 and 120 of the coil constituting the above is shown. 121 is a base and 122 is a flange. The coil 26 is wound between the base 121 and the flange 122. The base 121 has a groove 123 into which a substantially E-shaped ferrite core is fitted and a central hole 124 into which the central core is inserted.
Is provided. In addition, a pair of L's from the side of the base 121
The V-shaped terminal pin 125 is planted.

In FIG. 30, one end 125A of the terminal pin 125 is shown.
Twist and solder the coil ends to the
The flexible wiring cable is soldered to 5A.

In FIG. 31, one end 125A of the L-shaped terminal pin 125 is erected and the other end 125B is exposed to the outside, and the other end 125B is bent and soldered to the one end 125A. Flexible wiring cable is soldered to. In this case, since the coil end processing and the soldering of the flexible wiring cable are at different positions, there is no flow of solder at the coil terminal when soldering the flexible wiring cable, and the reliability is further improved.

The magnetic head 21 shown in FIGS. 1 and 2 described above.
Then, the end of the second spring system 55 of the leaf spring member 23 is bent and extended upward, and the free end thereof is bent outward at a substantially right angle or an angle close to the locking part 57 from the fixed body 24. It is configured to be hooked on the extending stopper piece 72 so as to be locked.

However, in the magnetic head 21 having such a structure, as shown in FIG. 32, when a strong external shock (external force F ₁ ) is applied, the third spring system 56 supporting the head main body 22 and the downward direction is lowered. Is displaced to the second, and the second is
Spring system 55 engaging portion 57 therefore that occasion piece extension 57A is largely curved in the direction of the arrow x _1, is moved to slide the surface of the stopper piece 72 in the arrow direction x _2, and finally the locking portion 57 May come off the stopper piece 72.

Once the locking portion 57 is disengaged from the stopper piece 72, the head main body 22 hangs downward. For example, since the head main body 22 is inserted into the window 92 of the cartridge 91 in the use state, it is not possible to jump the head main body 22 out of the window 92 when the cartridge is ejected when the locking portion 57 is disengaged from the stopper piece 72. It becomes possible, and if you eject it forcibly, the magnetic head will be damaged.

33 and 34 show another embodiment of the present invention in which this point is improved. In this example, as shown in FIG. 33 and FIG. 34, in particular, the bent extension portion 301 is bent and extended upward at a substantially right angle or an angle close to the tip of the second spring system 55 of the leaf spring member 23. A hole serving as a locking portion, which is a so-called cross-shaped hole 302 in which the vertical hole portion 302A and the horizontal hole portion 302B are orthogonal to each other in this example, is formed (see FIG. 36). In addition, the upper end 301A of the bent extension 301 is also bent outwardly at a substantially right angle or an angle close to the angle for the purpose of reinforcement. On the other hand, the fixed body 24
A T-shaped portion 303 (see FIG. 35) is formed integrally with the inside of the stopper piece 72 that is bent at a right angle at the tip of the arm 71 extending from the opposite side to the mounting portion 70. And this T
The cross-shaped hole 302, which serves as a locking portion on the side of the leaf spring 23, is inserted into the character portion 303 and is locked at the upper edge of the hole 302.

The other main structure is similar to that described above, and corresponding parts are designated by the same reference numerals. That is, the leaf spring material 23 includes a mounting portion 52 to the fixed body 24, a first spring system 53, an inclined portion 54 having a rib 60, a second spring system 55, and this second spring system. Third extending inward from 55
And a locking portion 304 having a cross-shaped hole 302 in the bent extension portion 301 is formed at the tip of the second spring system 55.

The fixed body 24 has a mounting portion 70 for fixing one end of the leaf spring material 23 and a stopper portion 305 extending asymmetrically from the mounting portion 70. That is, the locking portion 30 of the leaf spring member 23 extends from one side corresponding to the inner peripheral side of the disk 1 and has a predetermined inclination angle θ ₄ from the position corresponding to the second spring system 55.
4, an arm portion 71 that inclines over a length of 4, a stopper piece 72 that is bent at a right angle from the tip of the arm portion 71 so as to face the mounting portion as described above, and the stopper piece 72. And a T-shaped portion 303 that is integrally formed inside. The arm portion 71, the stopper piece 72, and the T-shaped portion 303 constitute a stopper portion 305.

As in the case shown in FIG. 24, the head main body 22 is inclined by a predetermined angle ψ toward the inner circumference of the disk 1 so that the sliding portion 29 is along the actual sliding direction with respect to the running direction of the head element. Consists of

On the other hand, the flexible wiring cable 81 is connected to the terminal pin 44 of the head body 22 so as to crawl on the center of the leaf spring material 23 from the fixed body 24.

Here, as shown in FIG. 36A, the locking portion 3
The vertical length L of the vertical hole portion 302A of the cross hole 302 formed in No. 04 is the thickness E ₁ of the T-shaped portion 303 of the stopper portion.
In consideration of the allowable range of surface wobbling of the disk 1, the assembly tolerance of the head body and the magneto-optical disk recording / reproducing device, and the component tolerance related to this, the head body 2 can be used in any case.
The length of the second sliding portion 29 is set so as to follow the surface wobbling of the disk. The lateral width G ₂ of the lateral hole portion 302B of the cross hole 302 is larger than the lateral width G ₁ of the horizontal portion of the T-shaped portion 303 of the stopper portion, and the lateral hole portion 302B of the cross hole 302B.
The vertical width E ₂ is larger than the thickness E ₁ of the T-shaped portion 303 of the stopper portion. If the vertical width E ₂ of the cross-shaped hole 302 is set to be too wide with respect to the thickness E ₁ of the cross-shaped portion 303, T
Since the character-shaped portion 303 becomes easier to come off than the cross-shaped hole 302,
It is desirable that the vertical width E ₂ be slightly wider than the thickness E ₁ .

According to the magnetic head 306 having such a structure,
Cross-shaped hole 302 formed in the locking portion 304 of the leaf spring material 23
The locking extension portion 30 in which the cross-shaped hole 302 is formed by the T-shaped portion 303 and the stopper piece 72 is formed by locking the stopper portion 305 so as to be inserted into the T-shaped portion 303.
1 is sandwiched. Therefore, even if a strong external impact (external force F ₁ ) as shown in FIG. 32 is received, the bent extension portion 301 of the leaf spring member 23 does not come into contact with the T-shaped portion 303 of the stopper portion and come off. The magnetic head can be flipped up at the time of ejecting 91, and damage to the magnetic head can be prevented.

The upper edge of the hole 302 formed in the engaging portion 304 of the leaf spring member 23 is located below the upper bent end 301A by a distance y ₁ . As a result, the locking position of the leaf spring material 23 is restricted by the upper edge of the hole 302, and the head body 22
It is possible to obtain the height accuracy from to the T-shaped portion 303 of the stopper portion.

Although the T-shaped portion 303 is provided inside the stopper piece 72 in the example of FIG. 34, the T-shaped portion 303 is provided outside the stopper piece 72 as shown in FIG. The cross-shaped hole 302 on the side of the leaf spring 23 may be inserted into the character portion 303 and locked. Also in this case, the leaf spring material 23 is not affected by an external impact as in FIG.
It is possible to prevent the locking portion 304 from coming off.

As shown in FIG. 47, a pair of wirings 31
The flexible wiring cable 320 having 9 is made to crawl from the fixed body 24 to one side of the leaf spring material 23, and the second spring system 55.
The cable end 3 by folding it back through the tip side of the
20A is fixed to the mounting portion 48 of the head body 22, and the lead end 31 extends from the side of the fixed cable end.
In the case of the configuration in which 9B is connected to the terminal pin 44 of the head main body 22, the T-shaped portion 303 of the stopper portion may be provided inside the stopper piece 72 from the point of the mounting process of the flexible wiring cable 320. . When the above flexible wiring cable 320 is used, an unnecessary force from the flexible wiring cable (that is, a force due to the rigidity of the flexible wiring cable) does not act on the head body 22, and the head body 22 can be stably operated.

In the above example, the cross-shaped hole 302 is formed in the engaging portion 304 of the leaf spring member 23 with respect to the T-shaped portion 303 of the stopper portion.
38A is formed as the locking portion 304.
It is also possible to form the T-shaped notch 308 shown in FIG. 9A or the cross-shaped notch 309 shown in FIG. 38B. Locking part 30
38A, the T-shaped notch 308 of FIG.
Is superior to the cross cut 309. Further, the locking portion 3
As for 04, as shown in FIG. 39, a T-shaped hole 322 can be formed.

Here, in the case where the engaging portion is the cross-shaped hole 302, the T-shaped portion 3 of the stopper portion is just provided in the lateral hole 302B.
When it receives an external impact when 03 is positioned, the locking portion 30
It is possible that 4 comes off from the T-shaped portion 303 of the stopper portion.

FIG. 40 shows another embodiment of the locking mechanism in which this point is further improved. That is, in this example, the cross-shaped hole 302 is formed in the locking portion 304 of the leaf spring material 23, and the lateral hole 302B of the cross-shaped hole 302 integrally projects from one side edge thereof, for example, a pair of left and right. The protrusion 310 is formed. As shown in FIG. 41, the protrusion 310 is provided with the cross-shaped hole 3 when the engaging portion 304 is engaged with the T-shaped portion 303 of the stopper portion.
No. 02 horizontal hole 302B, stopper T-shaped portion 303
When it is inserted, it is elastically bent (see FIG. 41B) and elastically returns to its original shape after the T-shaped portion 303 passes through (see FIG. 41C). In this example, a cut 311 is provided on the base side of the protrusion 310 to reduce the amount of protrusion in the lateral hole 302B and to provide elasticity. The location where the protrusion 310 is formed is not limited to the example shown in the figure, and can be formed at other portions. In the T-shaped portion 303 of the stopper portion,
As shown in FIG. 41A, it is formed in a tapered shape to facilitate insertion.

According to this structure, after the T-shaped portion 303 of the stopper portion is inserted into the cross-shaped hole 302 of the locking portion, the protrusion 310 returns and projects into the cross-shaped hole 302. If the T-shaped portion 303 of the stopper portion is the cross-shaped hole 3
Even if an external impact is applied at a position corresponding to the horizontal hole portion 302B of No. 02, it can be prevented from coming off by the projection portion 310.

FIG. 42 shows a modification. In this example, the locking portion 3
This is a case where the protrusion 310 having elasticity is formed in the cross-shaped hole 302 of No. 04 without the notch 311.

FIG. 43 shows still another embodiment of the locking mechanism. In this example, the tip of the second spring system 55 of the leaf spring member 23 is bent upward at a substantially right angle or an angle close to this, and is folded back so as to surround the stopper piece 72 to form a tubular locking portion 313. To do. Only the stopper piece 72 without the T-shaped portion 303 is used as the stopper portion. The leaf spring material 23 is inserted so that the stopper piece 72 is inserted into the tubular locking portion 313.
The locking portion 313 of is locked to the stopper piece 72. According to the locking mechanism having such a configuration, regardless of the position of the stopper piece 72, the locking portion 313 causes the stopper piece 7 to be exposed to an external impact.
It does not come off from 2.

FIG. 44 shows still another embodiment of the locking mechanism. In this example, the cross-shaped hole formed in the locking portion 304 is a modified cross-shaped hole 314 in which the horizontal hole portion 314B is inclined with respect to the vertical hole portion 314A from the horizontal. When the cross-shaped portion 303 of the stopper portion is inserted, it can be easily inserted by elastically deforming the locking portion 304. After insertion, the T-shaped portion 303 of the stopper portion and the lateral hole portion 31 of the deformed cross-shaped hole 314 are inserted.
Since 4B does not match, it will be in the state of crossing as shown in the figure,
The T-shaped portion 303 is a lateral hole portion 314B of the deformed cross hole 314.
Even if it is in a position corresponding to, it will not come off due to external impact.

FIG. 45 shows still another embodiment of the locking mechanism. In this example, the inside or outside of the stopper piece of the stopper portion,
In this example, a claw portion 315 that linearly extends inward is integrally formed, while a vertically long hole 316 is formed in the locking portion 304 of the leaf spring material 23.
Then, the claw portion 315 is inserted into the vertically long hole 316 so that the locking portion 304 is locked to the stopper portion. In this configuration, the locking portion 304 is moved in the arrow direction x ₂ by an external impact.
Even if the claw portion 315 is extended, the locking portion 30
4 can be prevented from coming off from the stopper portion.

FIG. 46 shows still another embodiment of the locking mechanism. In this example, the tip end 315A of the claw portion 315 in FIG.
Is formed by bending upward. Other configurations are the same as those in FIG. By bending the tip 315A of the claw portion 315 upward in this manner, the claw portion 31 of the locking portion 304 is further bent.
Make sure to prevent disconnection from 5.

Incidentally, it is also possible to bend the tip end horizontal portion of the T-shaped portion 303 of the stopper portion in FIGS. 34 and 37 upward.

On the other hand, as shown in FIG. 48, the connecting portion (round portion) 130 of the normal flexible wiring cable 81 is used.
Is provided with a round hole 131 with a constant radius.
The terminal pin 44 (for example, refer to FIG. 4) is inserted into the connector 1 and soldered. In this case, the length between the terminal pin 44 and the fixed portion of the flexible wiring cable 81 on the head body 22 side, that is, the mounting portion 48 (see FIG. 4) on the sliding portion 29, and the flexible wiring cable 81 used for this portion. The lengths must match. However, the head body 22
It is difficult due to the assembly error and variations in the molding of the flexible wiring cable 81. It is necessary to increase the assembling accuracy and also the forming accuracy of the flexible wiring cable 81.

Further, if the length of the flexible wiring cable 81 is shorter than the distance between the terminal pin 44 and the fixed portion 48 of the flexible wiring cable 81, the connecting portion (round portion) cannot reach the terminal pin 44, so that it is flexible. It is conceivable to lengthen the wiring cable 81. In that case, the flexible wiring cable 81 is bent after the connection, and the reaction force is applied to the fixing portions of the terminal pin 44 and the flexible wiring cable 81. At this time, in particular, since the terminal pins 44 are directly drawn from the head main body 22, the reaction force may be directly applied to the head main body 22. This deteriorates the sliding characteristics of the head body 22.

Further, in the round hole, the terminal block surface cannot be stably mounted unless it is parallel to the lower surface of the flexible wiring cable. Also at this time, if there is an assembly error, the flexible wiring cable 81 must be flexed, which causes the above problem.

49 and 50 show another embodiment of the flexible wiring cable 81 in which the above points are improved. In this example, as shown in FIG. 49A or FIG. 49B, as the connection portion (round portion) on the side connected to the terminal pin of the flexible wiring cable 81 led out from the head main body,
A bifurcated (for example, U-shaped) connecting portion 133 or a connecting portion 135 having a long hole 134 is formed. The shaded portion 129 is a wiring pattern made of Cu foil, for example.

FIG. 50 shows an overall concrete flexible wiring cable 81. A pair of parallel wiring patterns 129 are adhered and formed on the flexible insulating base 128,
The connecting portions 133 connected to the terminal pins of each wiring pattern 129 are formed in a bifurcated shape. Reference numeral 137 is a mounting hole into which the mounting portion 48 of the head body 22 is inserted, and 138 is an engaging portion that engages with the locking portion 82 on the fixed body 24 side.

This flexible wiring cable 81 is shown in FIG.
When connecting to the terminal pin of the head main body 22 shown in FIG. 1, that is, the terminal pin 44 that is slanted out from the end surface of the mounting portion 31 in the illustrated example, the mounting hole 137 of the flexible wiring cable 81 is provided as shown in FIG. The head body 22 is engaged with the mounting portion 48 to be positioned and fixed, and at the same time, the bifurcated connecting portion 133 is inserted so as to be sandwiched between the terminal pins 44 from above and soldered.

In this flexible wiring cable 81, even if the length between the mounting hole 137 and the connecting portion is formed longer, the terminal pin 44 is formed by the bifurcated connecting portion 133.
Since the connection position with is adjusted, the flexible wiring cable 81 can be connected without sagging.

53 and 54, the flexible wiring cable 81 having the bifurcated connecting portion 133 and the flexible wiring cable 81 having the ordinary connecting portion 130 of the round hole 131 and the terminals of the head main body 22 are shown in FIGS. Pin 44
The following shows the positional relationship that can be connected with the. In both figures, the shaded portions 161 and 162 indicate the ranges of the opening portions of the connection portions 130 and 133, respectively.

The flexible wiring cable 81 is rotated around its fixed point, and the terminal pin 4 is inclined at an angle.
Regarding the connection with 4, the connection part 130 of the round hole 131
In the case of a flexible wiring cable having
If the length between the center of the terminal pin 44 and the fixing point is a, as shown in Fig. 3, the flexible wiring cable is connected if it is shorter or longer than the length a, or conversely, the terminal pin 44 is displaced during assembly, for example. I can't.

On the other hand, a bifurcated or U-shaped connecting portion 13
In the flexible wiring cable of this example having No. 3, the connectable range with respect to the terminal pin 44 is wide, as indicated by the hatched portion 161. Therefore, as shown by the broken line, even if the position of the terminal pin 44 is displaced or there is variation in the molding of the flexible wiring cable, if the terminal pin 44 is within this shaded area 161, connection is possible and flexible. The wiring cable plane C and the terminal block surface D do not need to be parallel. The terminal pin 44 and the fixing point are always fixed with an optimum length so that no bending occurs. This effect is shown in FIG.
The same applies to the connecting portion 135 having the B long hole 134.

The connection portions 133 and 134 according to this embodiment are wired by using flexible wiring cables, and the positional relationship between the terminal pins or between the terminal pins and the flexible wiring cable fixing points is three-dimensional. It can be applied in the part where the linear length is unknown.

In the sliding magnetic head for magneto-optical recording according to the present invention, as described above, when sliding on the disk 1, a protrusion (so-called The head sliding portion collides with the bump 16).
It is the largest in sliding that the optical pickup for recording and reproducing the magneto-optical disc cannot follow the vibration of the disc 1 due to the impact at the time of the collision, the focus error occurs in the optical system, and the optical pickup comes off the track. It becomes a problem.

FIG. 55 is a schematic view of a magneto-optical disk drive using a magnetic field modulation type sliding magnetic head for magneto-optical recording. A head slider 141 (corresponding to the head main body 22 having the sliding portion 29) is brought into contact with and slides on the surface of the protective film 5 of the disk 1 with a required pressing load. The focus of the laser light source 6 emitted from the recording / reproducing optical pickup 140 is adjusted by a servo mechanism according to the surface wobbling and vibration of the disk 1. When the displacement of the disk 1 due to the collision between the head body 22 and the protrusion 16 of the disk 1 exceeds a certain value, the servo is released and a focus error occurs. The displacement of the disk 1 at the time of collision is almost proportional to the acting force on the disk 1.

First, the acting force at the time of collision will be estimated.
As shown in FIG. 56, consider a case where the slider 141 moves on the protrusion 16 having a length 2a and a height h in accordance with the protrusion shape. The shape of the protrusion is approximated by a parabola, and the frictional force does not act.

When the slider 141 of mass M moves at a constant velocity on the disk 1 at the peripheral speed Vx, the time t ₀ from when the slider 141 starts climbing the protrusion to when it reaches the apex is

[0142]

## EQU1 ## t ₀ = a / Vx

Letting Vy be the velocity of the slider 141 at the apex in the normal direction, from the relationship between the impulse and the momentum,

[0144]

## EQU2 ## F = MVy / t ₀

Since the slider 141 is accelerated by a constant force F and reaches the height h after the time t ₀ ,

[0146]

## EQU3 ## h = (1/2). (F / M) / t ₀ ² = (1/2). (Vy / t ₀ ) .t ₀ ² ∴Vy = 2h / t ₀

When F is obtained from the equations 1, 2 and 3,

[0148]

[Formula 4] F = 2 (MVx) · (h / a) · (Vx / a)

Here, both (h / a) and (Vx / a) are parameters of the disk 1, and Vx is constant. Therefore, in order to reduce F, on the head side, the slider mass M
Must be small. This means that, with respect to the above-mentioned magnetic head 21, it is necessary to reduce the weight of the sliding body 28 in order to reduce the displacement of the disk 1 when the head body 22 and the protrusion 16 of the disk 1 collide. ing. As a means for reducing the weight, it is possible to change the shape and size of the sliding body 28 including the sliding portion 29 and at the same time select a light material.

Tables 1 and 2 show the densities of the main materials.

[0151]

[Table 1]

[0152]

[Table 2]

From Table 1 and Table 2, in the head body 22 having the same shape, by using a plastic material for the sliding body 28, the mass of the head body 22 is less than half of that when other materials are used for the sliding body 28. It can be made lighter.

Therefore, in this embodiment, the head body 22 is formed by molding the sliding body 28 with a plastic material.

As the plastic material, polyethylene, nylon, polyester, polyimide, etc. listed in Table 1, polyphenylene sulfide (PPS)
Others and the like can be used. Further, the above plastic containing carbon (for example, containing 8% by weight to 30% by weight) can be used. FIG. 57 shows the relationship between the mass of the head body 22 and the focus error amount of the optical pickup. The focus error amount is the amount of deviation from the focus because the servo of the optical pickup cannot follow the vibration of the signal surface (that is, the recording layer 3) due to the collision between the head body and the protrusion 16 of the disk 1.

At present, it is possible to read and write signals with an optical pickup up to a focus error of 2 μm, but it is not possible to exceed 2 μm. The height of the protrusion 16 on the disk 1 is allowed up to 10 μm.

In FIG. 57, a straight line 150 marked with Δ has a mass of 200 mg and is on the outer peripheral side of the disc (r = 24 mm to 28 m).
m), the straight line 151 with ▲ mark has a mass of 200 mg, and the inner circumference side of the disc (r = 17 mm to 18 mm), the straight line 152 with □ mark has a mass of 40 mg, and the outer circumference side of the disc, and the straight line 153 with ■ mark has a mass of 40 mg and the inner circumference side of the disc. Is. Since the outer peripheral side is far from the drive fixing part, it easily shakes and the focus error amount is large. Since this outer peripheral side is also used for reading and writing data, the focus error must be suppressed to 2 μm or less on the outer peripheral side as well. The mass of the head body is about 30 to 40 mg when a plastic material is used for the slide body, about 60 to 140 mg when a metal material is used, and 60 to 80 mg when a ceramic material is used for the slide body. Therefore, in order to guarantee a focus error of 2 μm for the protrusion 16 having a height of 10 μm on the outer peripheral side of the disk as shown in FIG. 55, it is preferable to use a plastic material for the sliding body 28.

According to this example, the mass of the head main body can be reduced by using the plastic material having the density of half or less as compared with the metal material and the ceramic material for the sliding body 28.

By reducing the weight of the head main body, the impact of the collision between the head main body 22 and the protrusion 16 of the disk 1 can be reduced, the disk vibration can be reduced, and the focus error due to the servo non-following can be prevented.

Further, the head body 22 and the disk protrusion 16
You can extend the life of your data drive by reducing damage from collisions with. Furthermore, plastic materials are easier to mold than metal materials and ceramic materials, and are excellent in mass productivity.

As described above, the sliding member 2 is made of the plastic material.
When used in No. 8, not only the sliding type magneto-optical recording which does not require the servo mechanism of the magnetic head can be put into practical use, but also a low cost magnetic head can be provided as compared with the case of using other materials. it can.

In the above example, the magnetic head body having the sliding portion 29 on one side of the head element 27 is applied, but in addition, the sliding portion is integrally molded on a bobbin around which a coil (not shown) is wound. , Attach this bobbin to the ferrite magnetic core,
Even in a magnetic head in which the tip of the magnetic core is made to recede from the sliding surface of the sliding portion, the sliding portion and the bobbin can be formed using the above-mentioned plastic material.

In the magnetic heads of FIGS. 1 and 3 described above, the head body 22 has the third spring system 56 of the leaf spring material 23.
The head main body 22 is pressed against the surface of the disc 1 by the leaf spring member 23 with a predetermined load during use and is supported by the leaf spring member 23 and the disc 1.

However, when the magnetic head is not used, the magnetic head is separated from the disk surface and is hung from the third spring system 56 of the leaf spring member 23. If vibration or shock is applied at this time, the head body 22 vibrates,
There is a risk and possibility that the third spring system 56 having a gimbal function with low rigidity may be bent, damaged, or collide with surrounding parts.

58 and 59 show another embodiment in which this point is improved. The present embodiment is a magnetic head having a so-called anti-vibration function so that the head body 22 does not vibrate even when it is vibrated or shocked when the head is in an unused state apart from the disk surface.

In this example, as shown in the same figure, a head body 22 having a sliding portion 29 that slides in contact with the magnetic disk, and a leaf spring material 23 that supports this head body 22.
And a fixed body 24 for fixing one end of the leaf spring material 23,
A flexible wiring cable 81 having two wirings 171 and 172 is arranged along the leaf spring material 23. The connection portion (that is, the round portion) at one end of the flexible wiring cable 81 is inserted into and connected to the bobbin terminal 44 protruding from the upper surface of the sliding body of the head body 22, and the other end is arranged at the base side of the arm 71. .

In this embodiment, in particular, the flexible wiring cable 81 is integrally provided with the extension portion 173 facing the leaf spring member 23 and serving as a stopper portion. In this example, as an extension 173, the springs 55A and 55B on both sides of the second spring system 55 are opposed to each other so that they can be contacted with each other. It is extended and formed. The head body 22, the leaf spring material 23, and the fixed body 24 are the same as those shown in FIG.
Since it is the same as the magnetic head of No. 1, detailed description thereof will be omitted.

According to the magnetic head 174 having such a structure,
As shown in FIG. 59, the extension portion 173 of the flexible wiring cable 81 separates from the spring portions 55A and 55B of the second spring system 55 in the use state, and the head body 22 tries to lower by its own weight when not in use. Also, as shown in FIG. 60, the extension portion 173 of the flexible wiring cable 81 comes into contact with both spring portions 55A and 55b of the second spring system 55 to prevent the downward movement. When vibration or impact is applied in this state, even if the head main body 22 tries to start vibration in the vertical direction, the downward movement is blocked by the extension portion 173 of the flexible wiring cable 81 in contact with the spring portions 55A and 55B. , Do not move downwards. Further, the extension portion 173 of the flexible wiring cable 81 acts as a cushion, the energy of vibration and impact is absorbed, and the vibration does not last long.

Incidentally, the vibration resistance and impact resistance of the magnetic head of FIG. 58 and the magnetic head having no extension 173 were evaluated. As shown in FIG. 61, the magnetic head 174 of this example and the magnetic head 18 without the extension 173 are provided on the same board 181.
2 (hereinafter referred to as a magnetic head of a comparative example) is fixed in a state where each head body 22 is separated from the board 181. And
A weight 183 having a weight of 1 kg is dropped from a height of 30 cm on a board 181 at a midpoint between the magnetic heads 174 and 182, and the vibration of the head body 22 of each magnetic head 174 and 182 at that time is observed by a stereoscopic microscope. Observed with 184.

As a result of this experiment, the magnetic head 174 of this example was
Then, the head main body 22 moved upward by about 2 mm, returned to the original position and did not move further downward, and thereafter no vibrational movement was observed. On the other hand, the magnetic head 1 of the comparative example
In No. 82, it vibrated for 1-2 seconds with an amplitude of about 4-5 mm and converged to the original position.

As described above, in the case of the leaf spring material 23 and the head body 22 having the same design, the flexible wiring cable 81 has the extension portion 173 which comes into contact with the leaf spring material 23 in a state where the head body is not in contact with the disk. By virtue of this, the vibration damping effect of the head main body 22 can be obtained. Therefore, the margin of fluctuation of the head main body 22 is small, and the recording / reproducing apparatus can be further thinned.

Of course, the extension portion 173 can be applied to the flexible wiring cable 81 shown in FIG. In addition, a reinforcing material may be adhered to the extension portion 173.

In the embodiment shown in FIG. 58, as the extension 173 of the flexible wiring cable 81, the spring portions 55A and 55B on both sides of the second spring system 55 are opposed to each other so that the left and right portions are contacted with each other. In addition, as shown in FIG. 62, the flexible wiring cable 81 is formed.
Of the extension portion 173 of the second spring system 55 on one side of the second spring system 55.
It can also be formed by being extended to one side so as to face 5B and come into contact with it.

The vibration isolation means for the head body 22 shown in FIGS. 58 and 62, that is, the flexible wiring cable 81 having the extension 173, can be applied to the magnetic heads shown in FIGS. 33 to 46 and FIG. it can.

63 and 64 show another embodiment of the present invention which is provided with another vibration isolating means for the head main body 22.

In this example, as shown in FIG. 63, a head main body 22 having a sliding portion 29 for sliding contact with the magnetic disk, and a leaf spring material 23 supporting the head main body 22.
And a fixed body 24 for fixing one end of the leaf spring material 23,
A flexible wiring cable 81 having two wirings 171 and 172 is arranged along the center of the leaf spring material 23. The connecting portion (that is, the round portion) 81L at one end of the flexible wiring cable 81 is inserted into and connected to the bobbin terminal 44 protruding from the upper surface of the sliding body of the head body 22, and the other end is arranged at the base side of the arm 71. It

In this example, similarly to FIG. 37 described above, the stopper piece 72 at the tip of the arm 71 extending from the fixed body 24.
A T-shaped portion 303 is provided outside the
3 is a cross-shaped hole 302 of the locking portion 304 on the side of the leaf spring material 23.
It is configured to be inserted and locked (not shown).

Also, a ring-shaped conductor for shielding, for example, a Cu shield, for preventing electromagnetic noise radiation emitted from the coil itself to the outside so as to surround the outer periphery of the mounting portion in which the head element of the head body 22 is inserted. A (so-called shield ring) 221 is provided. Numerals 222 are welding portions provided at four corners on the mounting portion of the head element for fixing the shield ring 221. This welded part 222
Is to soften the protruding piece integrally provided on the mounting portion of the head element to fix the shield ring 221 by welding. The head main body 22, the leaf spring material 23, and the fixed body 24 are shown in FIG.
3 and FIG. 37, the detailed description is omitted.

In this embodiment, the flexible wiring cable 81 is extended from the round portion 81L to the non-spring system member of the leaf spring member 23, that is, the inclined portion 54 side.
4, an extension portion 224 that can serve as a stopper portion is integrally provided to face 4. In the illustrated example, the extension portion 224 has a width N ₂ (N ₂ > N ₁ ) wider than the width N _{1 of the} portion where the wirings 171 and 172 crawling in the center of the leaf spring material 23 are formed, and for example, the round portion 81L. It is formed with the same width as.

As shown in FIG. 64, the flexible wiring cable 81 according to this embodiment has, for example, a flame-retardant PET (polyethylene terephthalate) or a glass epoxy resin in a portion corresponding to the extension portion 224 and the round portion 81L which are stopper portions thereof. The reinforcing member 225 made of
The strength of the plate spring 4 is improved so as not to be cut when it comes into contact with the inclined portion 54 of the leaf spring member 23.

The same reinforcing material 2 is also applied to the portion of the flexible wiring cable 81 attached to the base of the arm 71.
25 is provided, and an adhesive 227 is provided below the reinforcing material 225. Flexible wiring cable 81
A polyimide film is used for the flexible insulating film 80 constituting the.

The inclined portion 54 of the leaf spring material 23 with which the extended portion 224 of the flexible wiring cable 81 abuts has ribs 60 formed on both sides, and has rigidity so that it cannot be bent.

According to the magnetic head 226 having such a structure,
In the use state, the extension portion 224 of the flexible wiring cable 81 is separated from the inclined portion 54 of the leaf spring material 23, and the head body 22 tends to lower by its own weight when not in use when the head body 22 is separated from the disk 1. The extension portion 224 of the flexible wiring cable 81 is the leaf spring material 23.
It comes into contact with the inclined portion 54 and is prevented from falling. In this state, even if vibration or impact is applied, the downward movement of the head main body 22 is blocked by the extension portion 224 of the flexible wiring cable 81 that is in contact with the inclined portion 54, and does not move downward. In addition, the extension 2 of the flexible wiring cable 81
24 acts as a cushion, the energy of vibration and impact is absorbed, and the vibration does not last long.

Further, in the case where the above-mentioned magnetic head 176 of FIG. 62, for example, receives repeated vibrations and impacts in particular, the extension 173 of the flexible wiring cable 81 comes into contact with the second spring system 55, so that the second spring system 55 is contacted. The spring system 55 may be deformed and its characteristics may be lost. However, in the magnetic head 226 of the present embodiment, the extension portion 224 of the flexible wiring cable 81 is brought into contact with the highly rigid inclined portion 54, so that the second spring system 55 is deformed even when subjected to repeated vibration and impact. This is not the case, and the characteristics of the second spring system 55 are not lost.

[0185] Incidentally, the flexible wiring and the magnetic head 226 of the cable 81 Figure 63 using, 2000m / s ² (200 and a magnetic head 176 of FIG. 62 described above in FIG. 64
G (gravity)) impact tests were performed for comparison. Both the magnetic heads 226 and 176 had the effect of suppressing the vibration of the head body 22. Next, when the deformation of the second spring system 55 and the change of the characteristics were examined, the results shown in Table 3 were obtained.

[0186]

[Table 3]

As shown in Table 3, the magnetic head 2 of FIG.
In addition to the vibration damping of the head main body 22, 26 is
It was confirmed that the second spring system 55 was neither deformed nor changed in characteristics.

In the example of FIG. 63 described above, the extension portion 224 serving as the stopper portion of the flexible wiring cable 81 is widened. However, although not shown, the width of the portion serving as the stopper portion is different from that of the other portion. The reinforcement member 2 is made the same as the width N ₁ and extends from the stopper portion to the round portion 81L.
25 is provided, and the portion that becomes the stopper portion is the leaf spring material 23.
It is also possible to make contact with the inclined portion 54 to provide a vibration damping function.

Further, the reinforcing member 225 of FIG. 64 is omitted, and the flexible wiring cable 8 in which the wide extension 224 is integrated.
It is also possible to select the material, thickness, and the like of the flexible insulating film 80 that composes 1, and form the flexible wiring cable 81 itself to be stiff, and to provide the vibration damping function by the extension portion 224.

The anti-vibration means, that is, the extension 224 provided on the flexible wiring cable 81 can be applied to the magnetic head 21 and the magnetic head 96 shown in FIGS.

65 and 66 show another example of the vibration isolating means for the head body 22. The example of FIG. 65 shows the head body 2
Stopper portions 185 [185A, 18A] protruding in a wing shape sandwiching the spring portions 55A, 55B of the second spring system 55 above and below both side surfaces of the mounting portion 31 for mounting the second head element, respectively.
5B] is provided and the upper stopper portion 185A abuts to prevent the head body 22 from being lowered when not in use.

In the example of FIG. 66, a stopper portion 186 is integrally provided at the rear end portion of the mounting portion 31 for mounting the head element of the head main body 22 in correspondence with the inclined portion 54 of the leaf spring material 23, and the stopper portion 186 is provided when not in use. The portion 186 is the inclined portion 54 of the leaf spring material 23.
To prevent the head body 22 from being lowered. Also in this configuration, it is possible to prevent the head body 22 from wobbling when the head body 22 is separated from the disk 1.

On the other hand, when the head body 22 is in sliding contact with the disk 1, the head body 22 is pressed against the disk surface by the leaf spring material 23 with a predetermined load, but is given an excessive impact. Leaf spring material 2
3 may vibrate and deform the leaf spring material 23.
As a result, the spacing (spacing) between the disk 1 and the head element 27 increases, and in some cases the head magnetic field becomes smaller than a desired value (8 × 10 ³ A / m or more),
There is a tightness that makes it impossible to record.

67 to 69 show another embodiment of the present invention in which this point is improved. This embodiment is a magnetic head having a vibration-proof function so that the head main body 22 does not vibrate even if it is subjected to excessive vibration or impact when the head is in contact with and slides on the disk surface.

In this example, as shown in the same figure, a head body 22 having a sliding portion 29 that slides in contact with the magnetic disk, and a leaf spring material 23 that supports this head body 22.
And a fixed body 24 for fixing one end of the leaf spring material 23, and a flexible wiring cable 81.

In this example, similarly to FIG. 34, the stopper piece 72 at the tip of the arm 71 extending from the fixed body 24 is used.
The T-shaped portion 303 is provided inside the
3 is configured to be inserted through the cross-shaped hole 302 of the locking portion 304 on the leaf spring material 23 side and locked.

Further, as in the case of FIG. 63 described above, for example, a Cu shield body (so-called shield ring) 2 is provided so as to surround the outer periphery of the mounting portion in which the head element of the head body 22 is inserted.
21 is provided.

In this embodiment, the head main body 22 is especially provided in the middle of the arm 71 extending from the fixed body 24.
The extension portion 231 serving as a stopper portion is integrally provided so as to face the above. The extension portion 231 is an upper surface of the head body 22 on the head element side (that is, a surface opposite to the vibration surface of the sliding portion 29), particularly the flexible wiring cable 81 and the terminal 44.
It is formed so as to face a position avoiding the soldering part of and to be able to come into contact with the upper surface of the head main body 22 when subjected to vibration or impact.

According to the magnetic head 232 having such a structure,
An extension portion (stopper portion) in which the upper surface of the head main body 22 extends from the arm 71 even if excessive vibration or shock is applied when the head main body 22 is in sliding contact with the disk 1.
The head main body 22 is prevented from further moving upward (so-called jumping up) by abutting against 231 and vibration can be prevented. Therefore, the leaf spring material 23 is not deformed, the spacing between the disk 1 and the head element 27 is not increased, and recording failure is not caused.

That is, when an impact is applied perpendicularly to the disk surface during use, the load of the leaf spring material 23 / head body 22
Head body 2 up to impact force corresponding to the value determined by the mass of
2 never leaves the disc 1. However, even when configured to withstand up to 10 G (gravity), for example, when an excessive impact exceeding 10 G is applied during use, the head main body 22 vibrates in the vertical direction, and the base of the third spring system 56 is moved. It rotates to the fulcrum and deforms the leaf spring material 23, especially the third spring system 56 thereof. However, in the present embodiment, the arm 71 is provided with the extension portion 231 serving as a stopper portion, so that, for example, 10 G
Can withstand excessive external shocks exceeding
It does not deform the third spring system 56.

The anti-vibration means, that is, the extension 231 provided on the arm 71 can be applied to the magnetic head 21 and the magnetic head 96 shown in FIGS.

Then, as a magnetic head to be implemented,
For example, as shown in FIG. 70, the extension portion 231 serving as the above-mentioned stopper portion is integrally formed with the arm 71 extending from the fixed body 24, and the extension portion 224 serving as the above-mentioned stopper portion is integrally formed with the flexible wiring cable 81. Form and configure. According to such a magnetic head 235, it is possible to prevent the head body 22 from vibrating even when externally vibrated or impacted, whether in use or not.

Incidentally, in FIG. 70, an extension portion 224 to be provided
5 in place of the flexible wiring cable 81 having
8 and the flexible wiring cable 81 having the extension portion 173 shown in FIG. 62 may be used.

The flexible wiring cable 81 connected to the terminal pins 44 of the head main body 22 is positioned on the fixed body 24 side, but at this time, it is desirable to position and bond and fix without using a jig.

An embodiment relating to positioning and fixing of the flexible wiring cable 81 will be described with reference to FIGS. 71 to 82.

In the embodiment of FIGS. 71 to 73, the flexible wiring cable fixing area 24A integrally formed on the base of the arm 71 of the fixed body 24 is separated by a predetermined distance.
Protrusions for paired positions, positioning pins 191 [191A, 191B] having a circular cross section in this example are provided, and the terminal portions 171a, 17 of the flexible wiring cable 81 are provided.
The positioning pin 1 is attached to the so-called round portion 192 corresponding to 2a.
A pair of holes 193 [193, which are inserted into 91A and 191B.
A, 193B] is provided. One hole 193A of the holes 193 is formed as a circular hole that fits into the positioning pin 191A, and the other hole 193B is formed as a long hole to absorb an assembly error and component tolerance. The width of the long hole is equal to the diameter of the round hole.

The positioning pin 191 can be formed by partially protruding from the surface by a half-pressing press punching when the fixed body 24 is made of metal, which is not shown. Further, when the fixed body 24 is made of a resin molded product, the positioning pin 191 can be simultaneously formed. The positioning pin 191 can be formed by other methods.

In the round portion 192 of the flexible wiring cable 81, as shown in FIG. 72, the wiring 171 made of a conductive layer such as copper foil is formed on the insulating base film 195.
172 terminal portions 171a, 172a are formed, the cover film 196 is formed except for the terminal portions 171a, 172a, and the release paper 199 and the pressure sensitive adhesive are provided on the back surface of the base film 195 only in the round portion 192. 200 is attached and a reinforcing member 198 is adhered via an adhesive 197.

When the flexible wiring cable 81 is fixed, the release paper 1 on the back surface of the round portion 192 is fixed.
After removing 99, the holes 193A and 193B are inserted into the positioning pins 191A and 191B. Long hole 193 at this time
Assembling error and component tolerance can be absorbed by B. By pressing at the same time as this insertion, the pressure-sensitive adhesive 200
The round portion 192 through the fixing region 24 of the fixed body 24
Crimped and fixed to A.

After fixing the round part 192, the connection,
Soldering or the like is performed. When connecting and soldering, force and heat are applied. There is a risk that the position of the round portion 192 may be displaced by the ordinary positioning and fixing of the adhesive, but in the present embodiment, the position of the round portion 192 is fixed by the positioning pin 191 on the fixing area 24A, so that there is no displacement. .

According to this structure, the pair of positioning pins 191A, 191B and the holes 193A, 193B are engaged with each other, whereby the round portion 192 is positioned with respect to the fixed area 24A without using a jig, and at the same time, the feeling is obtained. It is fixed by the pressure-sensitive adhesive 200. Therefore, a jig for positioning is unnecessary and the number of steps for fixing can be reduced. Moreover, since the flexible wiring cable 81 is fixed by an adhesive, the flexible wiring cable 81 does not shift in position for a long period of time, and does not shift even if external force or heat is applied.

Although the number of holes 193 is the same as that of the positioning pins 191, more holes may be provided than the number of positioning pins 191 if necessary. At this time, the setting of the position of the flexible wiring cable 81 can be selected.

In the embodiment shown in FIG. 74, the positioning pin 191A and the positioning pin 191A are provided on the round portion 192 of the flexible wiring cable 81.
Notch 202 [202A, 20
2B] is formed and configured. Notches 202A and 2
02B is notched in opposite directions. The number of notches 202 can be the same as or greater than the number of positioning pins 191. When fixing, this cutout 2
02A and 202B with positioning pins 191A and 191B
And to be fixed.

In the embodiment of FIG. 75, the round portion 192 of the flexible wiring cable 81 has a notch portion 203A for engaging the positioning pins 191A and 191B and a long hole 203B.
Are formed and configured. The total number of the notches and the long holes may be the same as or larger than that of the positioning pin 191. At the time of fixing, the notch 203A is engaged with the positioning pin 191A, and the elongated hole 203B is engaged with the positioning pin 191B to be fixed.

The embodiment of FIG. 76 is constructed by projecting the engaging portions 204 surrounding the corners of the round portion 192 of the flexible wiring cable 81, for example, three corners, in the fixing region 24A on the fixed body 24 side. At the time of fixing, the corner portion of the round portion 192 is engaged and fixed to the protruding engaging portion 204.

In the embodiment shown in FIG. 77, an engaging portion 205 surrounding the round portion 192 of the flexible wiring cable 81 is projectingly formed in the fixing region 24A on the side of the fixing body 24. At the time of fixing, the entire round part 192 is fitted and fixed to the engaging part 205.

The embodiment shown in FIGS. 76 and 77 is effective when holes or cutouts are not formed on the round portion 192 side.

The embodiment of FIG. 78 is constructed by forming a fitting recess 206 into which the shape of the round portion 192 of the flexible wiring cable 81 fits in the fixing area 24A on the side of the fixed body 24. At the time of fixing, the round portion 192 is fitted with the recessed portion 2
It is fitted to 06 and fixed.

Also in the above-described embodiments shown in FIGS. 74 to 78, the positioning jig is not necessary, and since the device is bonded and fixed at the same time as the positioning, the number of steps for fixing is reduced. In addition, displacement due to external force, heat, etc. is prevented, and displacement does not occur for a long time.

In addition, although not shown, it is also possible to provide a convex portion and a concave portion on both the fixing region 24A and the round portion 192, and to position and fix them by fitting them.

Further, in the above example, the two positioning pins 191 and a plurality of holes and notches for engaging with the positioning pins 191 are provided, but it is also possible to perform positioning with one positioning projection having a non-circular cross section.

For example, in FIG. 79, the flexible wiring cable 8 is provided with a semicircular protrusion 208 on the fixed area 24A side.
This is the case where the round portion 192 of No. 1 is provided with the semi-circular hole 209 that fits the other.

In FIG. 80, an oblong protrusion 210 is provided on the side of the fixing area 24A, and the long hole 2 that fits into the round portion 192 is used.
This is the case where 11 is provided.

In FIG. 81, a square protrusion 212 is provided on the fixed area 24A side, and a square hole 213 for fitting into the round portion 192 is provided.

In FIG. 82, a trapezoidal protrusion 214 is provided on the fixed region 24A side, and a trapezoidal notch 215 that fits in the round portion 192 is provided.

Also in each of the combined structures shown in FIGS. 79 to 82, similarly to the above example, a positioning jig is not required, and fixing can be performed at the same time as positioning, and it can endure long-term use without displacement.

In the above example, the present invention is applied to the ultra-small magneto-optical disk, but it can also be applied to a sliding type magnetic head for magneto-optical recording for ordinary magneto-optical disks.

The magnetic head of the present invention is a magnetic field modulation system,
It can be applied to optical modulation methods.

[0229]

According to the present invention, the surface wobbling of the recording medium and the shape change of the recording medium surface are sufficiently followed, the external impact is sufficiently endured, the size and the weight are reduced, and the posture stability of the magnetic head is improved. It is possible to provide an improved sliding type magnetic head for magneto-optical recording.

[Brief description of drawings]

FIG. 1 is a plan view showing an example of a sliding magnetic head for magneto-optical recording, which is the basis of the present invention.

FIG. 2 is a side view showing an example of a sliding magnetic head for magneto-optical recording, which is the basis of the present invention.

FIG. 3 is a plan view including a flexible wiring cable showing an example of a sliding magnetic head for magneto-optical recording, which is a basis of the present invention.

FIG. 4 is a perspective view of a head body.

5 is an exploded perspective view of the head body of FIG.

FIG. 6 is a plan view of an A sliding body. B is a cross-sectional view of a sliding body.

FIG. 7 is a plan view of a leaf spring material.

FIG. 8 is a side view of a leaf spring material.

FIG. 9 is a plan view of a fixed body.

FIG. 10 is a side view of a fixed body.

FIG. 11 is an operation explanatory diagram of the magnetic head of the present invention.

FIG. 12 is an operation explanatory diagram of the magnetic head of the present invention.

FIG. 13 is a schematic configuration diagram showing a comparative example of an A magnetic head. B is a schematic configuration diagram of a magnetic head which is the basis of the present invention.

FIG. 14 is an explanatory diagram according to the present invention.

FIG. 15 is an operation explanatory diagram of the present invention and a comparative example.

FIG. 16 is a plan view of a magneto-optical disk cartridge.

FIG. 17 is a sectional view of the window portion of the cartridge.

FIG. 18 is a plan view showing another example of the sliding type magnetic head for magneto-optical recording related to the invention.

FIG. 19 is a side view showing another example of the sliding type magnetic head for magneto-optical recording related to the invention.

FIG. 20 is a plan view showing still another example of the sliding magnetic head for magneto-optical recording related to the invention.

FIG. 21 is a schematic diagram of a magnetic head used for explaining the present invention.

22 is an explanatory diagram of the operation of the magnetic head of FIG.

FIG. 23 is an explanatory diagram according to the present invention.

FIG. 24 is a schematic view showing an example of a sliding magnetic head for magneto-optical recording according to the present invention.

FIG. 25 is an explanatory diagram of an operation of the magnetic head of FIG.

FIG. 26 is a plan view showing a specific example of a sliding magnetic head for magneto-optical recording of the present invention.

27 is a side view of the magnetic head of FIG. 26. FIG.

FIG. 28 is a plan view of an A slide body. B is a side view of the sliding body.

29 is a development view of the leaf spring material in the magnetic head of FIG. 26. FIG.

FIG. 30 is a perspective view showing another example of the coil bobbin.

FIG. 31 is a perspective view showing still another example of the coil bobbin.

FIG. 32 is an explanatory diagram when the sliding magnetic head receives an external impact.

FIG. 33 is a perspective view showing another example of the sliding magnetic head for magneto-optical recording of the present invention.

34 is an enlarged perspective view of a main part of FIG. 33. FIG.

FIG. 35 is a plan view of a main part (stopper part) of FIG. 33.

FIG. 36 is a front view of a main part (locking part) of FIG. 33. B: It is sectional drawing of the principal part (locking part) of FIG.

FIG. 37 is a perspective view showing another example of the locking structure according to the present invention.

FIG. 38 is a configuration diagram showing another example of the locking portion of the locking mechanism according to the present invention.

FIG. 39 is a configuration diagram showing another example of the locking portion of the locking mechanism according to the present invention.

FIG. 40 is a configuration diagram showing still another example of the locking portion of the locking mechanism according to the present invention.

41 is an operation explanatory view showing a locked state of the locking mechanism of FIG. 39. FIG.

FIG. 42 is a configuration diagram showing still another example of the locking portion of the locking mechanism according to the present invention.

FIG. 43 is a perspective view showing still another example of the locking mechanism according to the present invention.

FIG. 44 is a structural view showing still another example of the locking mechanism according to the present invention.

FIG. 45 is a perspective view showing still another example of the locking mechanism according to the present invention.

FIG. 46 is a perspective view showing still another example of the locking mechanism according to the present invention.

FIG. 47 is a plan view showing another example of the sliding magnetic head for magneto-optical recording of the invention.

FIG. 48 is a plan view of a connecting portion of a normal flexible wiring cable.

FIG. 49 is a plan view of a connecting portion of a flexible wiring cable according to the present invention.

FIG. 50 is a plan view showing an example of a flexible wiring cable according to the present invention.

FIG. 51 is a perspective view showing another example of the head main body.

FIG. 52 is a perspective view showing a state in which a flexible wiring cable is connected to the head body.

FIG. 53 is an explanatory diagram of a flexible wiring cable of the present invention.

FIG. 54 is an explanatory diagram of an ordinary flexible wiring cable.

FIG. 55 is a schematic view of a sliding magnetic disk drive.

FIG. 56 is an explanatory diagram of protrusions on the surface of the magneto-optical disk.

FIG. 57 is a characteristic diagram showing a relationship between a head mass and a focus error amount.

FIG. 58 is a plan view showing another example of the sliding magnetic head for magneto-optical recording of the present invention.

FIG. 59 is a side view of a main portion of the magnetic head of FIG. 42 in a used state.

FIG. 60 is a side view of a main portion of the magnetic head of FIG. 42 in an unused state.

FIG. 61 is a configuration diagram for explaining the present invention.

FIG. 62 is a plan view of an essential part of a sliding magnetic head for magneto-optical recording according to the present invention.

FIG. 63 is a plan view showing another example of the sliding magnetic head for magneto-optical recording according to the invention.

FIG. 64 is a perspective view showing another example of the flexible wiring cable according to the present invention.

FIG. 65 is a side view showing another example of the head main body according to the present invention.

66 is a side view showing another example of the head main body according to the present invention. FIG.

FIG. 67 is a plan view showing another example of the sliding magnetic head for magneto-optical recording according to the invention.

68 is a plan view showing an example of a fixed body related to the magnetic head of FIG. 67. FIG.

69 is a perspective view of a main part of the magnetic head of FIG. 67. FIG.

FIG. 70 is a perspective view of a main portion showing another example of the sliding magnetic head for magneto-optical recording according to the invention.

71 is a plan view of a round portion of a flexible wiring cable according to the present invention. FIG.

FIG. 72 is a cross-sectional view of a round portion of a flexible wiring cable according to the present invention.

FIG. 73 is a perspective view showing an example of positioning the round portion and the fixed body of the flexible wiring cable according to the present invention.

FIG. 74 is a perspective view showing another example of positioning the round portion and the fixed body of the flexible wiring cable according to the present invention.

FIG. 75 is a perspective view showing another example of positioning the round portion and the fixed body of the flexible wiring cable according to the present invention.

FIG. 76 is a perspective view showing another example of positioning the round portion and the fixed body of the flexible wiring cable according to the present invention.

77 is a perspective view showing another example of positioning of the round portion and the fixed body of the flexible wiring cable according to the present invention. FIG.

FIG. 78 is a perspective view showing another example of positioning of the round portion and the fixed body of the flexible wiring cable according to the present invention.

FIG. 79 is a plan view showing another example of positioning the round portion and the fixed body of the flexible wiring cable according to the present invention.

FIG. 80 is a plan view showing another example of positioning of the round portion and the fixed body of the flexible wiring cable according to the present invention.

FIG. 81 is a plan view showing another example of positioning of the round portion and the fixed body of the flexible wiring cable according to the present invention.

FIG. 82 is a plan view showing another example of positioning the round portion and the fixed body of the flexible wiring cable according to the present invention.

FIG. 83 is an explanatory diagram of a magnetic field modulation method.

FIG. 84 is a sectional view of a magneto-optical disk.

[Explanation of symbols]

1 Magneto-optical disk 22 Head body 23 Leaf spring material 24 Fixed body 27 Head element 28 Sliding body 29 Sliding part 44 Terminal pin 53, 55, 56 Spring system 57 Locking part 71 Arm 72 Stopper piece 73 Stopper part 81 Flexible wiring cable 91 cartridge 92 window 130,133,135 flexible wiring cable connection part 171,172 wiring 231,224,173 extension part 185A, 185B, 186 stopper part 191A, 191B positioning pin 192 round part 193A, 193B hole 202A, 203A, 203B Notch portion 313,204 Locking portion 206 Fitting concave portion 208,210,212,214 Protrusion 209 Semicircular hole 211 Long hole 213 Square hole 215 Cutout 301 Bending extension 302 Cross-shaped hole 303 T-shaped portion 305 Stoppers 308, 309 Notches 310 Protrusions 314 Deformed cross-shaped holes 315 Claws 316 Vertically elongated holes 322 T-shaped holes

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Kenji Yazawa, 6-735 Kita-Shinagawa, Shinagawa-ku, Tokyo Sony Corporation (72) Kazutoshi Asada 6-35, Kita-Shinagawa, Shinagawa-ku, Tokyo No. Sony Corporation (72) Inventor Hideo Tanaka 6-735 Kitashinagawa, Shinagawa-ku, Tokyo Sony Corporation (72) Inventor Michiaki Samura 6-735 Kita-Shinagawa, Shinagawa-ku, Tokyo -Inside the corporation

Claims (2)

[Claims] 1. A head element has a sliding portion on one side for sliding contact with a recording medium, the sliding portion being arranged on the inner peripheral side of the recording element with respect to the head element and having a sliding surface. A sliding magnetic head for magneto-optical recording having a predetermined inclination angle with respect to the traveling direction of the head element so that the longitudinal direction is along the traveling direction of the recording medium. 2. A head main body having a sliding portion that slides in contact with a recording medium is supported by a leaf spring material, and a supporting position of the head main body is displaced from a center line of the leaf spring material. The sliding type magnetic head for magneto-optical recording is characterized in that the widths of the spring portions on both sides of the head body are asymmetric.