JP2743534B2 - Magnetic head device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic head device for recording and reproducing a disk-shaped recording medium with a head with a slider.

[Conventional technology]

For example, as seen in JP-A-55-22296,
Conventionally, a magnetic head device of a disk device has a suspension made of a leaf spring attached to a tip end portion of a head arm.
A head with a slider is attached to the tip of the suspension.

Then, the slider-equipped head is floated on a micron-order on a disk-shaped recording medium which is driven to rotate at high speed to perform desired recording and reproduction. The seek and tracking of the slider-equipped head are driven by a voice coil motor. This is performed by the swinging motion of the head arm.

[Problems to be solved by the invention]

However, in the conventional method in which the seek and tracking of the head with the slider are performed by the swinging motion of the head arm, quick tracking cannot be performed because the moment of inertia at the time of the swinging drive of the head arm is large. There was a problem that the time was long.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a magnetic head device capable of performing quick tracking during a seek.

[Means for solving the problem]

A magnetic head device according to the present invention includes a suspension facing a recording surface of a disk-shaped recording medium, a slider formed with an opening facing the recording surface, and attached to a tip of the suspension; A piezoelectric element, one end of which is fixed to the base end side, the other end is located near the opening, and the position of the other end is displaced by application of a drive voltage, and the piezoelectric element is attached to the other end of the piezoelectric element; A magnetic head disposed in the opening, and simultaneously moving the magnetic head and the slider as a slider-attached head by driving the suspension during a seek, and applying a drive voltage to the piezoelectric element. In addition, tracking is performed by displacing only the magnetic head in the tracking direction of the disk-shaped recording medium.

[Action]

According to the magnetic head device configured as described above, the suspension can be driven to move the magnetic head and the slider together as a head with a slider, and the magnetic head alone can be tracked alone.

〔Example〕

Hereinafter, an embodiment of a magnetic head device in which the present invention is applied to a hard disk device will be described with reference to the drawings.

First, the entire hard disk drive will be described with reference to FIG.

In a sealed housing 1, one or a plurality of upper and lower hard disks 2 as a disk-shaped recording medium and one or a plurality of upper and lower slider-equipped heads 3 as heads for recording and reproducing the hard disk 2 are provided. I have. The hard disk 2 is mounted on a spindle 4 which is driven to rotate by a spindle motor (not shown), and is driven to rotate at a high speed of, for example, 3,600 rpm in the direction of arrow a. The head 3 with the slider is supported by the magnetic head device 6 at the tip of the head arm 5, and the head arm 5 is swingably driven by the voice coil motor 7 about the arm shaft 8 in the direction of the arrow b, thereby the head 3 with the slider. Is almost sought in the radial direction of the hard disk 2. In the recording / reproducing mode, the hard disk 2 is recorded and reproduced with the slider-equipped head 3 flying above the recording surface 2a of the hard disk 2 by 0.1 to 0.5 μm by an air film generated by the high-speed rotation of the hard disk 2. Things.

Next, the details of the magnetic head device 6 will be described with reference to FIGS.

A suspension 10 constituted by a leaf spring made of a stainless steel plate or the like having a plate thickness of 100 μm or less has a horizontal piece 10a,
It has a rising piece 10b that rises at a right angle on both left and right sides, and is tapered as a whole. The base 10c of the horizontal piece 10a is fixed to the tip of the head arm 5 with a plurality of screws 11 and a mounting plate 12. A gimbal plate 13 composed of a leaf spring similar to the suspension 10 is fixed to the lower surface of the tip 10d of the horizontal piece 10a, and the slider 3a of the head 3 with a slider is fixed to the lower surface of the gimbal plate 13. . And
A pair of bimorph plates 14, which are piezoelectric elements, are horizontally arranged in a vertical posture along a central portion on a horizontal plate 10a of the suspension 10, and a base 14a of the bimorph plate 14 is
0a is fixed to the base 10c side by an adhesive 15 or the like.
The magnetic head 3b of the head 3 with the slider is vertically adhered to the lower surface of the tip 14b of the bimorph plate 14, and the magnetic head 3b is attached to the notch 16 and the gimbal plate 17 provided at the tip 10d of the horizontal piece 10a. It is inserted vertically through an opening 17 provided in an opening 18 provided in the slider 3a. The base 14a of the bimorph plate 14 is connected to a pair of lead wires 19a and 19b for applying a drive voltage to electrodes on both side surfaces thereof and a lead wire 19c for grounding a central electrode.
Further, from the base portion 14a side of the bimorph plate 14 to the tip end portion 14b, an elongated notch 20 is formed along the lower edge of the bimorph plate 14.
Is provided. The gimbal plate 13 is a mounting piece
A part of 13a is fixed to the lower surface of the horizontal piece 10a by spot welding or the like, and the slider 3b is bonded to the lower surface of the movable piece 13b stamped at the center of the mounting piece 13a. And the movable piece 13b
A pivot 13c that is integrally provided by projecting upward is brought into contact with the lower surface of the horizontal piece 10a.

The slider 3a is formed in a double barrel shape, a groove 32 is formed between a pair of slider portions 31, and the lower surfaces of both slider portions 31 are formed on a slider surface 33. Tapered portions 34 and 35 are formed at one end and one side in the length direction of both slider surfaces 33, respectively, and a tapered portion 36 is formed at the other end. The gap surface at the lower end of the magnetic head 3b
37 is substantially flush with both slider surfaces 33.

 Next, the operation will be described.

First, as shown in FIG. 7, when the hard disk 2 is driven to rotate at a high speed of 3,600 rpm or the like in the direction of arrow a, the swirling flow of air induced on the recording surface 2a of the hard disk 2 causes the recording surface 2a to rotate. It flows into the slider 3a from the direction of arrow c in FIG. The swirling flow flows from the taper portions 34 to the lower portions of the slider surfaces 33, and generates a dynamic pressure at the lower portions of the slider surfaces 33, so that the slider 3a is floated from the recording surface 2a by predetermined flying characteristics. And
Since the slider 3a supports the tip 10d of the suspension 10 from below via the gimbal plate 13, the magnetic head 3b supported by the suspension 10 via the bimorph plate 14 also moves from the recording surface 2a integrally with the slider 3a. Be surfaced. At this time, the flying height of both slider surfaces 33 of the slider 3a and the gap surface 37 of the magnetic head 3b with respect to the recording surface 2a is 0.
It is 1 to 0.5 μm.

Then, as shown in FIG.
The head arm 5 is swingably driven in the direction of the arrow b around the arm shaft 8 by the
Is almost sought in the radial direction of the hard disk 2,
When the slider-equipped head 3 is sought from the outermost circumference of the hard disk 2 to the innermost circumference, or when the head 3 is sought from the innermost circumference to the outermost circumference, the inflow direction of the swirling flow of air into the slider 3 is the It is changed in the direction of arrow d shown in FIG. And the swirling flow in the direction of arrow d is
From 35, it flows into the lower part of both slider surfaces 33, and both slider surfaces 33
Generates a dynamic pressure similar to that described above.

Therefore, the seek of the slider-equipped head 3 does not cause any disturbance in the flying characteristics of the slider-equipped head 3, and the slider-equipped head 3 can be sought at a high speed. 3 accidentally comes into contact with the recording surface 2a of the hard disk 2,
These can be prevented from being mutually damaged.

Next, the drive voltage applied to both the lead wires 19a and 19b of the bimorph plate 14 is controlled while seeking the entire head 3 with the slider as described above.
14b is deformed about the base portion 14a as shown by a dashed line in FIG. Then, the magnetic head 3b is displaced within the opening 18 of the slider 3a in the direction of arrow e which is the tracking direction of the hard disk 2 in FIGS. The magnetic head 3b can track the recording track.

Accordingly, the magnetic head 3b can be separated from the slider 3a while seeking the entire head 3 with the slider, and the magnetic head 3b can be independently tracked, so that quick tracking can be performed. At this time, the mass of the magnetic head 3b alone is very small, and the moment of inertia when the magnetic head 3b is displaced in the tracking direction (the direction of arrow e) is very small. (In the direction of arrow e).

From the above results, the slider 3 for the hard disk 2 having a diameter of 2.5 inches achieves an access time of 10 m.sec or less when the head 3 seeks.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various effective changes can be made based on the technical idea of the present invention.

In addition, the present invention is not limited to a hard disk device that records and reproduces a hard disk, but a magnetic head of various disk devices that records and reproduces a floppy disk device that records and reproduces a floppy disk and various other disk-shaped recording media. Applicable to the device.

〔The invention's effect〕

In the magnetic head device according to the present invention, the suspension can be driven to move the magnetic head and the slider integrally as a head with a slider, and the magnetic head alone can be tracked alone, so that the access time at the time of seek is significantly reduced. it can.

Further, the piezoelectric element for tracking and driving the magnetic head has a very simple structure, has few failures, has a long life and is highly reliable.

Also, the length of the piezoelectric element can be increased according to the length of the suspension, and one end of the element is fixed to the base end of the suspension. Even if the slider and the magnetic head are downsized, they can be easily assembled.

Further, the amount of displacement of the other end of the piezoelectric element can be increased, so that the magnetic head can be tracked over a wide range.

[Brief description of the drawings]

The drawings show an embodiment of the present invention. FIG. 1 is a plan view of a main part, FIG. 2 is a sectional view taken along the line II-II of FIG. 1, and FIG. FIG. 4 is a sectional view taken along the line III-III of FIG. 4, FIG. 4 is a bottom view taken along the line IV-IV of FIG. 3, FIG. 5 is a plan view of the entire magnetic head device, and FIG. FIG. 6B is a sectional view taken along the line VIA-VIA of FIG. 5, FIG. 6B is a sectional view taken along the line VIB-VIB of FIG. 5, and FIG. 7 is a perspective view of the entire hard disk drive. In the reference numerals used in the drawings, 2 ... hard disk (disk-shaped recording medium) 3 ... head with slider 3a ... slider 3b ... magnetic head 5 ... head arm 6 ... magnetic head device 10 ... suspension 10d ... ... Tip 14: Bimorph plate (piezoelectric element) 14 a: Base 14 b: Tip e: Tracking direction.

Claims (1)

(57) [Claims] 1. A suspension facing a recording surface of a disk-shaped recording medium, a slider formed with an opening facing the recording surface and attached to a tip of the suspension, and a base end of the suspension. A piezoelectric element, one end of which is fixed to the portion and the other end is located near the opening, and the position of the other end is displaced by application of a driving voltage; A magnetic head disposed at the same time, while driving the suspension at the time of seek to simultaneously move the magnetic head and the slider as a head with a slider, and applying a drive voltage to the piezoelectric element,
A magnetic head device wherein tracking is performed by displacing only the magnetic head in a tracking direction of the disk-shaped recording medium.