JPH03120675A - Disk device - Google Patents

Abstract

PURPOSE:To miniaturize and to thin a disk device by arranging a motor rocking and driving a head arm on the outer pheriphery of an arm shaft in a ring. CONSTITUTION:The ring-shaped motor 13 consisting of ring-shaped magnets 15 and plural coils 17 arranged in the ring by facing the magnets 15 is arranged on the outer periphery of the arm shaft 2, and the head arm 4 is rocked and driven by the motor 13. The ring-shaped motor 13 arranged on the outer periphery of the arm shaft 2 effectively generates torques in the whole area of the outer periphery of the arm shaft 2. Thus, the maximum radius and the height size of the motor 13 as against the center of the arm shaft 2 are reduced, and the whole device is miniaturized and thinned.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a disk device that is most suitable for application to, for example, a hard disk device, and in particular a disk device. In a disk device configured in such a manner that a head for recording and/or reproducing is attached to a head arm, and the head arm moves as a swinging part about an axis J-axis, a motor for swinging the head arm is attached to the arm. The grooves are arranged annularly around the outer periphery of the shaft, thereby making it possible to make the disk device smaller and thinner.

[Prior Art] FIG. 4 shows a drive motor for a head arm in a conventional hard disk drive, as disclosed in, for example, Japanese Patent Application Laid-Open No. 63-275082.

In this case, the arm shaft 2 is vertically fixed and installed in the sealed case 1, and the head 7-m 4 is swingably mounted on the outer periphery of the arm shaft 2 via a bearing 3.
114a A head with a slider 5t, which is one head or a plurality of upper and lower heads, is connected to the other end 4b of the head arm 4 via a head support member 6 made of a leaf spring.
Voice coil motor 7t is placed at @.

Then, the voice coil motor 7//c drives the head arm 4t to swing around the arm shaft 2, and one disk-shaped recording medium or a plurality of upper and lower disks are rotationally driven by a spindle (not shown). The hard disk 8 is scanned in the radial direction by a head 5 with a slider to perform desired recording and/or reproduction.

The voice coil motor 7 is connected to the other end 4 of the head arm 4.
A bllK coil 9 is mounted horizontally, and a pair of upper and lower bases of magnets 10 and yokes 11 are arranged horizontally above and below the coil 9 and fixed in a sealed case 1.

[Problem to be solved by the invention]

However, in a conventional hard disk drive configured so that the head arm 4 is swing-driven by the voice coil motor 7rc, in order to effectively generate the torque of the voice coil motor 7, the head 5 with the slider of the head arm 4 or the head support Where member 6 is attached! The coil 9, magnet 10, and yoke 11 are placed at a position with a large diameter relative to the center of the arm shaft 2 while ensuring rotational balance around the arm shaft 2 between the 4a side and the other end 4bll to which the coil 9 is attached. must be placed.

As a result, the maximum diameter r1 of the voice coil motor 7 relative to the center of the arm shaft 2 increases. Further, the voice coil motor 7#2 and the coil 9 are provided with a pair of magnets 10 and a yoke 11 facing each other above and below the coil 9, and the height dimension h1 is large. Therefore, there is a problem in that it is difficult to make the entire hard disk device smaller and thinner.

Also, the maximum position e4r 2 with respect to the center of the arm shaft 2 on the other end 4b side where the coil 9 of the head arm 4 is added is
As the head arm 4 becomes longer, the inertia during the swinging movement of the head arm 4 increases, which is disadvantageous in high-speed access of the head 5 with the slider and disadvantageous in power saving.

SUMMARY OF THE INVENTION An object of the present invention is to provide a disk device in which the maximum diameter and height of a motor for driving a head arm relative to the center of the arm shaft can be reduced.

[Means to solve the problem]

In order to achieve the above object, the disk device of the present invention includes:
An annular motor consisting of an annular magnet and a plurality of coils arranged annularly facing the magnet is disposed on the outer periphery of the arm shaft, and the head arm is oscillated by the motor. be.

[For production]

In the disk device configured as described above, the annular motor disposed on the outer periphery of the arm shaft effectively generates torque over the entire outer periphery of the arm shaft. Even if it is small enough,
It is possible to generate a head arm drive torque equal to or greater than that of a conventional voice coil motor. In addition, since this motor only has an annular magnet and a plurality of coils facing each other, the height of this motor can be made sufficiently smaller than that of a conventional voice coil motor. In addition, since the maximum diameter of this motor can be made smaller, the inertia during the swinging drive of the head arm can also be reduced.
It can be made much smaller than before.

〔Example〕

Hereinafter, one embodiment of a hard disk device to which the present invention is applied will be described with reference to FIGS. 1 to 3.

The same structural parts as those of the conventional example shown in FIG.

First, in the hard disk drives shown in the first example and the second example, the annular motor 13 that drives the head arm 4'lk is an in-hub type iron core motor. That is, a rotor hub 140 consisting of a head and an arm 4 is rotatably attached to the outer circumference of the arm shaft 2 via a bearing 3, and an annular magnet 15 is attached perpendicularly to the inner side of the outer circumference 14b of the rotor hub 14. , a plurality of coils 17 are wound at equal intervals around the outer periphery of an annular iron core 16 arranged horizontally inside the magnet 15, and 17% of these coils are arranged in an annular manner so as to face each other horizontally inside the magnet 150. It is. S1 sealed case 1
A cylindrical portion 19a'Y is provided integrally with the arm shaft base 19J, which is screwed by a plurality of screws 18 to the base 1aVc of the rotor hub 14.
The iron core 16 is horizontally attached to the outside of the cylindrical portion 19a. The head 5 with one or more upper and lower sliders is attached to the outer peripheral part 14b of the rotor hub 14.
A counter provided on a part of the outside of the outer peripheral part 14b is attached to a plurality of upper and lower head attachment parts 20 via the head support member 6, and a counter is provided on the outside of the outer peripheral part 14b at a position opposite to the head attachment parts 20. A weight 21 is attached.

In this hard disk device, an in-hub type annular motor 13 is arranged on the outer periphery of the arm shaft 2.
A rotor hub 14 is assembled by the head arm 4. And wl! is arranged in a ring shape around the outer circumference of the arm shaft 2!
By energizing the coil 17, the rotor hub 14 together with the annular magnet 15 is rotated alternately in forward and reverse directions within a certain angle.

The head 5 with the slider is a swing driver.

At this time, since the annular motor 13 extends over the entire outer circumference of the arm shaft 2 and effectively generates torque, even if the maximum diameter r3 of the motor 3 with respect to the center of the arm shaft 2 is sufficiently small (r3< rl)sIt is possible to generate a head arm drive torque equal to or greater than that of a conventional voice coil motor.

In addition, since this motor 13Fi is an in/% type with an annular magnet 15 and a plurality of coils 17 facing each other horizontally, the height of this motor 16 is sufficiently smaller than that of a conventional voice coil motor. (h 2 < h 1 ). In addition, since the maximum diameter r3 of this motor 13 can be made small, the rotor hub 14
The inertia during the swinging drive of the head arm 4 configured as shown in FIG.

Note that the coil 17 of the motor 13 is
It is also possible to provide the fixed side (stator #) K on the fixed side (stator #), but in that case.

While the head arm 4 is being oscillated, wiring members such as a flexible printed circuit board that connects the coil 17 and the fixed motor control circuit are moved together with the coil 17, which adversely affects the tracking accuracy of the slider-equipped head 5. It is easy to cause However, as shown in Figs. 1 and 2-2, if the coil 17 of the motor 13 is installed in the fixed direction a (stator side), and the magnet 15'a-movable @ (rotor @) fc is installed, 4
The tracking accuracy of the slider and attached head 5 can be improved without being affected by the above-mentioned adverse effects at all.

Next, the hard disk device shown in FIG.

The annular motor 23 for driving the head arm 4 is composed of a two-in-hap type, planarly opposed motor. That is, it is composed of a head arm 4. An annular magnet 2 is placed inside @ (lower surface) of the horizontal upper side 14c of the cl-tap 14.
4'Jk is mounted horizontally, and a plurality of coils 25 are arranged in a ring shape so as to be vertically opposed to the lower side of the magnet 24.

And, this in-hub type planar facing type motor, ri 23
It is also possible to achieve the same effect as described above.

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

Furthermore, the present invention is not limited to hard disk devices, but can be applied to various disk devices that record and/or re-read various disk-shaped recording media.

[Effect of the invention] Since the present invention is configured as described above.

This produces the following effects.

Since the maximum diameter and height of the motor that drives the head arm relative to the center of the arm axis can be made sufficiently smaller than those of conventional voice coil motors, it is possible to make the entire disk device smaller and thinner. can.

Since the inertia during the oscillating drive of the head arm can be made sufficiently small compared to the conventional method, it is advantageous for high-speed access of the head oscillatingly driven by the head arm, and is also advantageous for power saving.

[Brief explanation of drawings]

FIGS. 1 to 3 show an embodiment of the present invention, in which the first wall is inside the longitudinal cross-sectional side of the main part, and the second wall is inside the first
-■ A side view in the direction of arrows, and FIG. 6 is a longitudinal cross-sectional side view of a modified example. FIG. 4 is a vertical cross-sectional side view of the conventional example. Also, in the code used for the - side, 2...
...7-J, axis 4...Head arm 5...Head with slider (head) 8...・Hard disk (disc-shaped recording medium). 13...Motor 15...Magnet 17...Coil 23...Motor 24...Magnet 25... Coil agent

Claims (1)

[Scope of Claim] A disk device in which a head for recording and/or reproducing a disk-shaped recording medium is attached to a head arm, and the head arm is driven to swing around an arm axis, comprising: an annular magnet; An annular motor consisting of a plurality of coils arranged in an annular shape facing a magnet is disposed on the outer periphery of the arm shaft, and the head arm is swing-driven by the motor. disk device.