JPH0479085A - Magnetic disk device - Google Patents

Abstract

PURPOSE:To prevent a magnetic head from shifting in position by providing a weight formed of an elastic material in a damper storage part provided to a swing arm. CONSTITUTION:The damper storage part 21 where a damper 22 projected at the center part of a head arm 11 is formed in a nearly trapezoid shape. The damper 22 is formed of a rubber material, etc., having elastic action in a nearly trapezoid shape. Namely, the head arm 9 is provided with the damper 22 where the weight 23 is fixed and resonant vibration from a voice coil motor 12 and from outside is absorbed by the damper 22 and weight 23. Consequently, the positioning accuracy of the magnetic head 13 can securely be improved and the storage and reproduction characteristics of the magnetic disk 3 can be improved effectively.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a magnetic disk device for storing and reproducing information on a magnetic disk.

[Prior Art] In general, magnetic disk devices are shown in Figs.
The one shown in the figure is known.

In the figure, 1 is a box-shaped housing with a sealed structure to prevent dust from entering the inside, and the housing 1 is composed of a base IA and a cover (not shown) that covers the base IA. has been done. Reference numeral 2 denotes a spindle motor as a disk starting motor provided on the base IA in the housing 1. A disc-shaped magnetic disk 3 is fixedly supported on the spindle motor 2 by a clamp 4. Reference numeral 5 indicates a pivot shaft installed in the base IA of the housing 1, and reference numeral 6 indicates a swing arm pivotally supported on the pivot shaft 5 so as to be swingable in the direction of arrow A. The swing arm 6 is attached to the pivot shaft 5. A swingably supported carrier 7, a head arm 9 attached to the carrier 7 via solid screws 8, 8, and a solid screw 10 attached to the head arm 9.
10, and a load arm 11 located on the tip side of the swing arm 6, and the swing arm 6 is provided extending above the magnetic disk 3.

12 is a carrier 7 located on the base end side of the swing arm 6
The figure shows a voice coil motor as a head drive motor that is installed in the carrier 7 and controls the rotation of the swing arm 6. Magnet yoke part 12B arranged on the base IA side in the state
It is composed of.

Reference numeral 13 denotes a magnetic head provided on the tip side of the load arm 11 located on the tip side of the swing arm 6. The magnetic head 13 positions the magnetic disk 3 by the swinging of the swing arm 6, and Information on disk 3 is stored and played back.

Next, the load arm 11 located at the tip side of the swing arm 6 will be explained based on FIG.

Here, the load arm 11 is connected to the magnetic arm 13.
The load arm 11 is made of stainless steel and is lightweight in order to improve the flying characteristics of the load arm 11. The load arm 11 includes a load arm body 11A having a triangular planar shape, and a magnetic head 13 formed on the tip side of the load arm body 11A. the head attachment part 11B to which the load arm body 1 is attached;
1A and a fixing part 11C that is fixed to the helad arm 9, and the fixing part 11C has screw holes 11D and 11D into which the solid screws 10 are inserted.
is drilled. Then, the load arm main body 11
A damping material 14 is attached to A, and the damping material 14 damps the bending and torsional vibrations of the load arm 11, and the magnetic head 13 swings the swing arm 6 over the magnetic disk 3. This prevents shaking during rotation and ensures the positioning of the magnetic head 13.

The magnetic disk device according to the prior art is configured as described above, but upon startup, the spindle motor 2 is driven to rotate the magnetic disk 3 in the direction of arrow B, and then a drive pulse is supplied to the voice coil motor 12 to start the swing. The arm 6 is moved along arrow A toward the outer circumferential side of the magnetic disk 3 in the radial direction.

At this time, since the magnetic disk 3 is rotating at high speed, the magnetic head 13 is in a state of floating by a minute distance due to the airflow generated on the surface of the magnetic disk 3.

Next, based on an inner circumference seek command or an outer circumference seek command from the control device, a drive pulse is output to the voice coil motor 12, and the swing arm 6 is swung on the arrow A toward the inner circumference side in the radial direction of the magnetic disk 3. The magnetic head 13 is moved back and forth in the radial direction of the magnetic disk 3, and during this time information is recorded and reproduced on a target recording track formed in a recording area on the magnetic disk 3.

[Problem to be solved by the invention]

However, in the magnetic disk drive according to the above-mentioned prior art, the vibration damping material 1 is attached to the load arm 11 of the swing arm 6.
4, vibration of the load arm 11 itself, which is provided with reduced weight, can be prevented. However, the vibrations of the voice coil motor 12 and external vibrations are propagated to the carrier 7, the head arm 9, and the magnetic head 13, causing the swing arm 6 and the magnetic head 13 to receive vibrations of around 2°8 KHz as shown in FIG. Resonant vibration occurs. Therefore, a problem arises in that the positioning accuracy of the magnetic head 13 decreases, and the storage and reproduction characteristics of the magnetic disk 3 deteriorate.

The present invention was made in view of the problems of the prior art, and by attenuating the resonant vibration of the head arm,
Storage on magnetic disks by preventing misalignment of the magnetic head,
An object of the present invention is to provide a magnetic disk device that ensures reliable reproduction.

[Means for Solving the Problems] The feature of the configuration adopted by the present invention in order to solve the above-mentioned problems is that a damper accommodating portion is provided in the swing arm, and a damper formed of an elastic material is accommodated in the damper accommodating portion. However, a weight is provided within the damper.

[Effect]

With this configuration, vibrations generated in the swing arm can be absorbed by the damper and the weight, and misalignment of the magnetic head can be prevented.

〔Example〕

Embodiments of the present invention will be described below with reference to FIGS. 1 to 4. Note that the same components as those in the prior art described above are given the same reference numerals, and their explanations will be omitted.

In the figure, reference numeral 21 designates a damper accommodating part that accommodates a damper 22, which will be described later, which is bored in the center of the helad arm 11. By providing the damper 22 around the entire circumference, it is possible to prevent the damper 22 from coming off.

Reference numeral 22 denotes a damper formed in a substantially trapezoidal shape from a rubber material having an elastic action, and the damper 22 has a weight mounting hole 22A drilled in the axial direction near the center thereof, into which a weight 23, which will be described later, is fixed. A concave groove portion 22B that engages with the convex groove portion 21A of the damper accommodating portion 21 is provided on the entire circumference of the side surface of the damper 22.

Reference numeral 23 indicates a cylindrical weight, and the weight 23 is connected to the damper 2.
It is fixed in the weight attachment hole 22A of No. 2 by baking or adhesive.

The magnetic disk device of this embodiment is constructed as described above, but since its operation as a magnetic disk device is the same as that of the prior art, a description thereof will be omitted.

However, in this embodiment, by providing the damper 22 to which the weight 23 is fixed to the herad arm 9, resonance vibrations from the voice coil motor 12 and the outside can be absorbed by the damper 22 and the weight 23. , 4th
As shown in the figure, resonance vibrations around 2.8 KHz can be reliably damped. As a result, the magnetic head 1
The positioning accuracy of the magnetic disk 3 can be reliably improved, and the storage and reproduction characteristics of the magnetic disk 3 can be effectively improved. Furthermore, compared to the conventional technology, the head arm 11
It enables high-speed access because it is lightweight.

Although the damper 22 and the weight 23 are provided on the head arm 9 in the above embodiment, they may be provided on the carrier 7 (or may be provided on the load arm 11).

Further, in the above embodiment, the damper 22 is formed into a substantially trapezoidal shape, but the present invention is not limited to this shape, and any shape may be used as long as the weight 23 is elastically supported by the swing arm 6.

[Effects of the Invention] As described in detail above, the present invention provides a damper accommodating portion for accommodating a damper in the swing arm, and a damper having a weight is installed in the damper accommodating portion, thereby improving the voice coil motor. The vibration propagated from the outside to the magnetic head via the swing arm can be attenuated by the damper and the weight, and the resonant vibration of the swing arm and the magnetic head can be reliably damped.This improves the positioning accuracy of the magnetic head. The storage and playback characteristics of the magnetic disk can be effectively improved.

[Brief explanation of the drawing]

1 to 4 relate to an embodiment of the present invention. FIG. 1 is a front view showing the overall configuration of a magnetic disk device according to this embodiment, and FIG. 2 is an exploded perspective view showing a state in which a damper is attached to a helad arm. 3 is a vertical cross-sectional view showing the load arm attached to the head arm, FIG. 4 is a vibration characteristic diagram showing the effect of the damper, and FIGS. 5 to 7 relate to the prior art. The figure is a front view showing the overall configuration of the magnetic disk device with the cover removed, Figure 6 is a perspective view of the load arm, and Figure 7 is a perspective view of the load arm.
The figure is a vibration characteristic diagram. DESCRIPTION OF SYMBOLS 1... Housing, 2... Spindle motor (disk drive motor), 3... Magnetic disk, 6... Swing arm, 7... Carrier, 9... Head arm, 11... Load Arm, 12...Voice coil motor (head drive motor), 13...Magnetic head,
21... Damper housing section, 22... Damper, 23...
・Weight. Frequency (Hz) Frequency (Hz)

Claims (1)

[Claims] A housing, a magnetic disk rotatably provided within the housing, a disk drive motor that rotationally drives the magnetic disk, a rotatable swing arm provided extending over the magnetic disk, and the swing. a magnetic head provided on the tip side of the arm for storing and reproducing information on the magnetic disk; and a head provided on the proximal end side of the swing arm for moving the magnetic head in the radial direction of the magnetic disk. A magnetic disk device comprising a drive motor, characterized in that the swing arm is provided with a damper housing part, a damper made of an elastic material is housed in the damper housing part, and a weight is provided in the damper. Magnetic disk device.