JPS5954077A - Magnetic disk device - Google Patents

Abstract

PURPOSE:To improve the reliability of a magnetic disk device, by providing an elastic support member which can be freely deformed in the same direction as a positioning device between a voice coil motor and a substrate. CONSTITUTION:When a positioning command is received from an upper device while a magnetic disk 1 is revolved together with a spindle 6 by a motor, a carriage 3 performs a seeking action accompanied by a high-speed reciprocating motion. In this case, a voice coil motor 4 receives a reaction proportional to the motion acceleration of the carriage 3 in the direction of an arrow B. This reaction is transmitted to a substrate 5. However the level and the oscillating cycle of the reaction transmitted to the substrate 5 are greatly reduced by the buffing function of a coil spring 12 since the base 4a of the motor 4 is connected to the substrate 5 via the spring 12. Therefore the degree of deformation is reduced, and the cycle of the substrate 5 has a big difference from the motion cycle of the carriage 3. As a result, the relative displacement between a magnetic disk and a magnetic head is greatly reduced. This reduces the malfunction during a writing or reading action.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic disk drive, and more particularly to a magnetic disk drive having a configuration in which a positioning device mounting a magnetic head, a voice coil motor for driving the positioning device, and a magnetic disk are mounted on the same substrate.

In recent years, as the storage density of magnetic disk devices has increased, the distance between the magnetic disk and the magnetic head has become narrower. The positioning device (hereinafter referred to as the carriage) on which the head is mounted, the voice coil motor (hereinafter referred to as the VCM) that drives the carriage, and the magnetic disk are mounted on the same board, and these are covered with a cover to prevent dust from entering from the outside. Many magnetic disk drives are used that have a so-called sealed structure that prevents damage from occurring.

A conventional magnetic disk device having the above-mentioned configuration is
The positioning operation of the magnetic head for writing or reading data on a magnetic disk (hereinafter referred to as seek operation)
When carrying out a drive and seek operation repeatedly, bending vibrations occur, resulting in misalignment between the magnetic head and the magnetic disk, which can cause malfunctions in writing or reading operations. be.

An object of the present invention is to eliminate the above-mentioned drawbacks by preventing the reaction force applied to the soft CM from being directly transmitted to the magnetic disk drive, thereby reducing malfunctions in write or read operations, and thus providing a highly reliable magnetic disk device. Our goal is to provide the following.

The magnetic disk device of the present invention includes at least one magnetic disk fixed to a rotating shaft rotatably attached to a substrate, and a magnetic disk device provided corresponding to the magnetic disk for writing and reading data signals. a plurality of magnetic heads that read positioning signals; holding the magnetic heads;
A positioning device that moves on the substrate to position the magnetic head on a predetermined track of the magnetic disk, and a voice coil motor that is attached to the substrate and drives the positioning operation of the positioning device, and the voice coil An elastic support member that can be deformed in the same direction as the movement direction of the positioning device is provided between the motor and the substrate.

Hereinafter, the present invention will be explained in detail with reference to the drawings.

Referring to FIG. 1, which shows one embodiment of the present invention, a spindle 6 has a plurality of magnetic disks 1 mounted thereon fixedly in almost parallel and is rotatably attached to a substrate 5. (not shown). A magnetic head (read/write head) 2 that writes and reads data signals to and from the magnetic disk 1, and a servo head 2a that records positioning signals (servo signals) and reads servo signals from the servo disk 1a. The carriage 3 carrying the magnetic disk 1 reciprocates linearly on the substrate 5 toward the center of the magnetic disk 1. In order to drive the reciprocating motion of this carriage 3, a VC constituted by a permanent magnet
M4 is provided, and VCM4 is attached to the board 5 with a bolt 13.
The reciprocating motion of the carriage 3 is driven in cooperation with the coil 3a attached to the carriage 3.

These magnetic disks 1 and carriages 3 and 70M
4 is covered with a cover (not shown) and is constituted by the cover and the substrate 5, and is housed in a sealed case.

FIG. 2 is an enlarged cross-sectional view of the mounting portion of the VCM 4 (section A in FIG. 1) in FIG. Fixed. Note that the positioning member 1
1 is an auxiliary member for accurately holding the position of the base 4a and the corresponding part of the board 5 when fixing the VCM 4;
It fits into holes provided in the base 4a and the substrate 5, and the bolt 13 is tightened through the hollow hole.

The magnetic disk device configured as described above operates as follows.

5- When the magnetic disk 1 is driven by the motor and is rotating together with the spindle 6, when a positioning command is received from the host device, the carriage 3 is instructed by a positioning control circuit (not shown) to perform a high-speed reciprocating motion. Perform a seek operation. At this time, the VCM 4 is subjected to a reaction force proportional to the acceleration of the movement of the carriage 3 in the direction of arrow B in FIG. This reaction force is transmitted to the substrate 5, but the base 4a of the VCM 4 and the substrate 5
Since the coil spring 12 is coupled to the substrate 5 through the coil spring 12, the magnitude of the force transmitted to the substrate 5 and the period of vibration are significantly reduced due to the buffering effect of the coil spring 12. For this reason,
Since the amount of deformation of the substrate 5 is reduced and the period thereof is significantly different from the period of movement of the carriage, the relative displacement between the magnetic disk and the magnetic head is significantly reduced.
Therefore, malfunctions during write or read operations are reduced.

(The seek operation of the carriage 3 does not necessarily perform a reciprocating motion with an equal period, but when performing a high-speed seek motion repeatedly, it may perform a motion that can be approximately regarded as a reciprocating motion with an equal period. When the period of the reciprocating motion of 6 cycles coincides with the period of the repeated bending motion of the substrate 5 due to the reaction force and resonance occurs, the relative positional deviation between the positioned magnetic disk and the magnetic head becomes the largest. If such a situation can be avoided, the probability of a write or read malfunction will be extremely small.As mentioned above, the buffering effect of the coil spring greatly changes the cycle of the repeated bending motion of the board 5, so the risk of resonance can be avoided.) The coil spring 12 in the above embodiment is as follows.

It is clear from the above description that other configurations of the elastic material 1 may be used, such as a disc spring, rubber, etc.

As described in detail above, by using the magnetic disk device of the present invention, malfunctions are less likely to occur during write or read operations, and therefore a highly reliable magnetic disk device can be obtained.

[Brief explanation of drawings]

FIG. 1 is a front view of one embodiment of the present invention, and FIG. 2 is a sectional view showing details of section A in FIG. 1. In the figure, 1...magnetic disk, 2...magnetic head, 3...positioning device (carriage), 4...
...Voice coil motor (VCM), 5...
・Substrate, 6...Rotating shaft, 11...Positioning member, 12...Coil spring, 13...
··bolt.

Claims (1)

[Claims] At least one magnetic disk fixed to a rotating shaft rotatably attached to a substrate, and a plurality of disks provided corresponding to the magnetic disk for writing and reading data signals or reading positioning signals. a magnetic head; a positioning device that holds the magnetic head and moves on the substrate to position the magnetic head on a predetermined track of the magnetic disk; and a positioning device that is attached to the substrate and controls the positioning operation of the positioning device. A magnetic disk device comprising a voice coil motor to be driven, the magnetic disk device having an elastic support member deformable in the same direction as the movement direction of the positioning device between the voice coil motor and the substrate. .