JPH0845207A - Magnetic head for disk device - Google Patents

Abstract

PURPOSE:To surely prevent plastic deformation of a holding part. CONSTITUTION:A plate-shaped position regulating part 44 is provided at the tip of a load beam 41 as an arm of a magnetic head 14, and U-shaped restraining parts 45 and 47 are provided on a gimbal 42 as the holding part. Then, the position regulating part 44 is inserted into a recessed groove of the restraining parts 45 and 47. Since the restraining parts 45 and 47 are restrained by the position regulating part 44 even when impact or vibration is given to this magnetic head 14, no displacement of the head can be performed by only its height H. Consequently, a deformable spring part 29 can surely be prevented from being plastically deformed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic head suitable for application to a hard disk, a magneto-optical disk device or the like.

[0002]

2. Description of the Related Art In rewritable hard disks and magneto-optical disk devices, CSS (contact start stop) or NCSS (non-contact start stop) magnetic heads are used. FIG. 11 shows the configuration of a general NCSS type magneto-optical disk device 1. The figure shows a state in which the cabinet is removed. In this magneto-optical disk device 1, a rewritable magneto-optical disk 11 is a spindle motor 12
Is driven to rotate. An optical pickup 13 is arranged on the lower surface side of the magneto-optical disk 11, and a levitation type magnetic head 14 is arranged on the upper surface side.

The optical pickup 12 and the magnetic head 14 are attached to a moving portion 15, which is the linear motor 1.
6 is attached to the movable part 17. by this,
The optical pickup 13 and the magnetic head 14 linearly move along the radial direction of the magneto-optical disk 11. The optical pickup 13 includes an optical system block 18
The light emitted from is supplied through the prism 19 in the moving unit 15. Further, the light reflected by the magneto-optical disk 11 is received by the optical system block 18 via the optical pickup 13 and the prism 19. Spindle motor 1
2, the linear motor 16 and the optical system block 18 are fixed on the chassis 20.

FIG. 12 shows a perspective view of a conventional magnetic head 14. The magnetic head 14 has a moving part 15 (FIG. 11).
A load beam 23 as an arm having elasticity with an appropriate spring constant is provided at the tip of the base plate 22 of the suspension 21 attached to the. A gimbal 24 as a holding portion is fixed to the tip of the load beam 23 by spot welding, for example, and a slider 25 is attached to the lower side thereof. A magnetic pole 26 is fitted in the slider 25, and a magnetic field generated by the magnetic pole 26 records or erases information on the magnetic recording material of the magneto-optical disk 11.

As shown in FIG. 13, the gimbal 24 is provided with fixing portions 28 and 28, which are fixed to the base portion 27 of the load beam 22 by, for example, spot welding, on both sides, and the inner end portion thereof is displaced by an appropriate spring constant. Plate-shaped spring part (displacement part)
29, 29 are provided. An upright portion 30 having an appropriate height is provided on one end side of the spring portions 29, 29, and an adhesive portion 31 having a predetermined size is connected to the base portion 27 in parallel with the lower end portion thereof. The slider 25 is bonded to the lower surface of the bonding portion 31. In addition, a pivot protrusion 32 that comes into contact with the base portion 27 is formed at approximately the center of the adhesive portion 31 by embossing in this example. Magneto-optical disk 11 (see FIG.
When 1) rotates, the slider 25 floats by receiving the air that moves with it. At this time, the slider 25 can be freely displaced in all directions around the pivot protrusion 32, which improves the flying characteristics of the slider 25.

[0006]

By the way, in the conventional magnetic head 14, the spring portion 29 of the gimbal 24 is made thin to reduce the rigidity so that the slider 25 faithfully follows the undulations and irregularities of the magneto-optical head 11. It is normal to have
However, in this case, when a shock or vibration is applied to the magnetic head 14, the spring portion 29 may be plastically deformed. In particular, when the magneto-optical disk 11 is removable as in the magneto-optical disk device 1, the magnetic head 14 is tilted upward and the slider 25 is lifted during standby. Spring part 2 when shock is applied
9 is easily plastically deformed. When each spring portion of the gimbal 24 is plastically deformed, the gap between the magneto-optical disk 11 and the magnetic pole 26 cannot be maintained at a specified dimension, so that recording or erasing cannot be performed normally or the slider 25 collides with the magneto-optical disk 11. May be scratched.

Therefore, the present invention solves the above-mentioned problems and proposes a magnetic head capable of reliably preventing plastic deformation of the gimbal.

[0008]

In order to solve the above-mentioned problems, according to the present invention, an arm slidably arranged in the radial direction of the disk and a tip of the arm are opposed to the recording surface of the disk. In a magnetic head of a disk device having a slider arranged and a holding portion mounted displaceably between the slider and an arm, a locking means is provided at the displacement portion of the holding portion, and the displacement portion of the holding portion is located. It is characterized in that the arm is provided with a position restricting means for restricting the position of the locking means when displaced by a fixed amount.

[0009]

As shown in FIG. 1, a plate-shaped position regulating portion 44 is provided at the tip of the load beam 41 as an arm of the magnetic head 14.
Is provided, and U-shaped locking portions 45 and 47 are provided on the gimbal 42 serving as a holding portion. Then, as shown in FIG. 4, the position restricting portion 44 is inserted into the concave groove 46 of the locking portions 45, 47. In this magnetic head 14, since the locking portions 45 and 47 are locked to the position restricting portion 44 when the locking portions 45 and 47 are displaced by a predetermined amount even when shock or vibration is applied,
It cannot be displaced any further. Therefore,
It is possible to reliably prevent the deformable spring portion 29 from being plastically deformed.

[0010]

Embodiments of the magnetic head of the disk drive according to the present invention will now be described in detail with reference to the drawings. The same parts as those described above are designated by the same reference numerals and detailed description thereof is omitted.

FIG. 1 shows the structure of a magnetic head 14 of a disk device according to the present invention. The magnetic head 14 is applied to the magneto-optical disk device 1 (FIG. 11) and the like. The magnetic head 14 is composed of a suspension 40, a slider 25, and a magnetic pole 26. The suspension 40 has a base plate 22 attached to the moving part 15 (FIG. 11).
A load beam 41 serving as an arm is fixed to the arm, and a gimbal 42 serving as a holding portion is fixed to the lower surface side of the tip thereof. The slider 25 is bonded to the lower side of the gimbal 42. At the appropriate position of the slider 25, the magnetic pole 2
6 is fitted.

As shown in FIG. 2, a position regulating portion 44 having an appropriate width and length is provided at the tip of the load beam 41 so as to project outward from the upper end of the rib 43. on the other hand,
The gimbal 42 has a spring portion (displacement portion) as shown in FIG.
A U-shaped engaging portion 45 is provided upright on the outer end portion of 29. The recessed groove 46 of the locking portion 45 is formed with an appropriate height H,
It is located inside. In addition, the locking portion 45 of the adhesive portion 31
A U-shaped locking portion 47 is also provided upright on the opposite end to the height H
The concave groove 48 is directed inward. The parts of the gimbal 42 other than those described above are the same as those in FIG.

In the magnetic head 14, as shown in FIG. 4, the position restricting portion 44 of the load beam 41 is inserted into the concave groove 46 of the locking portion 45 of the gimbal 42. Now, while the magneto-optical disk device 1 is on standby, the tip of the load beam 41,
That is, when the slider 25 is lifted, the weight of the slider 25 causes the spring portion 29 of the gimbal 42 to move up and down the lower portion 3.
Bends downward with 0 as the fulcrum. At this time, the locking portions 45, 4
The upper walls of the concave grooves 46 and 48 of 7 are locked to the position restricting portion 44, and the spring portion 29 does not bend further downward. Further, when shock or vibration is applied to the magnetic head 14 in this state, the slider 25 is swung up and down, but the locking portion 45,
Since the displacement amount of 47 is limited by the position restricting portion 44, the spring portion 29 is prevented from being deformed beyond the elastic deformation range. As a result, it is possible to reliably prevent the plastic deformation of the spring portion 29.

In the above embodiment, the case where the vertical position of the spring portion 29 of the gimbal 42 is regulated has been described. However, as in the magnetic head 50 shown in FIG. It is also possible to restrict only the deformation in the direction. In this magnetic head 50, as shown in FIG. 6, the ribs 52 of the load beam 51 are provided with four position restricting portions 53. Further, as shown in FIG. 7, L-shaped locking portions 55 and 56 are provided at positions corresponding to the position regulating portion 53 at the outer end of the spring portion 29 of the gimbal 54 and the opposite end of the adhesive portion 31. There is. In this magnetic head 50, as shown in FIG.
As shown in FIG. 5, the locking portions 55 and 56 of the gimbal 54 are spaced apart from each other by a predetermined distance H1 and the position regulating portion 53 of the load beam 51.
It is located above.

Therefore, when shock or vibration is applied to the magnetic head 50 and the slider 25 is displaced downward by the height H1, the locking portions 55 and 56 are locked to the position regulating portion 53,
The spring portion 29 will not be further deformed. By appropriately setting the dimension H1, it becomes possible to reliably prevent the spring portion 29 from being plastically deformed.

Further, as shown in FIG. 9, the same gimbal 54 as described above is used, and the locking portions 55 of the gimbal 54,
A position restricting shaft 63 for restricting the position of 56 in the vertical direction may be provided on the rib 62 of the load beam 61 with a predetermined distance H. In this case, as shown in FIG.
The locking portions 55 and 56 of the gimbal 54 are arranged between the position regulating shafts 63. As a result, similarly to the magnetic head 14 of FIG. 1, even when the magnetic head 60 is subjected to impact or vibration, the locking portions 55 and 56 can be displaced only in the vertical range H, so that the spring portion 29 is plastically deformed. Can be reliably prevented. Further, the pivot projection 64 that contacts the slider 25 may be provided on the load beam 61 side.

[0017]

As described above, according to the present invention, the arm slidably arranged in the radial direction of the disk, the slider arranged at the tip of the arm so as to face the recording surface of the disk, and the slider. In a magnetic head of a disk device having a holding portion that is displaceably mounted between an arm and an arm, locking means is provided at the displacing portion of the holding portion, and when the displacing portion of the holding portion is displaced by a predetermined amount, locking is performed. It is characterized in that the arm is provided with a position restricting means for restricting the position of the means.

Therefore, according to the present invention, even if shock or vibration is applied to the magnetic head, the position of the engaging portion provided on the displacement portion of the holding portion is regulated by the position regulating means, so that the displacement portion is plastically deformed. Can be reliably prevented.
This ensures that information is recorded or erased and that it does not damage the disc.
It is effective in improving reliability.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a magnetic head 14 of a disk device according to the present invention.

FIG. 2 is a perspective view showing a shape of a position restricting portion 44 of the load beam 41.

FIG. 3 is a perspective view showing the shapes of locking portions 45 and 47 of the gimbal 42.

FIG. 4 is a cross-sectional view taken along the line AA of FIG.

FIG. 5 is a perspective view of a magnetic head 50 of a first modified example.

6 is a perspective view showing a position restricting portion 53 of the magnetic head 50. FIG.

7 is a perspective view showing locking portions 55 and 56 of the magnetic head 50. FIG.

8 is a sectional view taken along line BB of FIG.

FIG. 9 is a perspective view of a magnetic head 60 of a second modified example.

10 is a cross-sectional view taken along line CC of FIG.

FIG. 11 is a configuration diagram of a general magneto-optical disk device 1.

FIG. 12 is a configuration diagram of a conventional magnetic head 14.

FIG. 13 is a perspective view showing the shapes of a conventional load beam 22 and gimbal 24.

[Explanation of symbols]

 1 Magneto-optical disk device 11 Magneto-optical disk 13 Optical pickup 14, 50, 60 Magnetic head 21, 40 Suspension 22 Base plate 23, 41, 51, 61 Load beam 24, 42, 54 Gimbal 25 Slider 26 Magnetic pole 29 Spring part 31 Adhesive part 44, 53 Position regulating portion 45, 47, 55, 56 Locking portion 63 Position regulating shaft

Claims (1)

[Claims] 1. An arm slidably arranged in a radial direction of a disc, a slider arranged at a tip of the arm so as to face a recording surface of the disc, and between the slider and the arm. In a magnetic head of a disk device having a holding portion mounted displaceably, locking means is provided in the displacing portion of the holding portion, and when the displacing portion of the holding portion is displaced by a predetermined amount, the locking means is A magnetic head for a disk device, wherein a position regulating means for regulating a position is provided on the arm.