JPH06195909A - Magnetic disk device - Google Patents

Abstract

PURPOSE:To prevent the destruction of the surface record information on the surface of a magnetic disk by preventing the contact of a magnetic head with this magnetic disk in spite of application of the vibration and impact from the outside thereon while the magnetic disk device having the magnetic head held by a flexer is held stopped. CONSTITUTION:A metallic plate 12 for regulating the flexer is disposed nearly perpendicularly to the surface of the magnetic disk 3 between the flexer 2 and the magnetic disk 3 to prevent the contact of the magnetic head 1 and the magnetic disk 3. This magnetic disk device is so provided that the metallic plate 12 is disengaged from between the flexer 2 and the magnetic disk 3 at the time of loading of the magnetic head 1, by which the displacement of the flexer 2 by the vibration and impact from the outside is regulated by the metallic plate 12 and the contact of the magnetic head 1 and the magnetic disk 3 is prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic disk device having a magnetic head held by a flexure.

[0002]

2. Description of the Related Art A magnetic disk device has been made smaller and lighter year by year, and it has been required that it can be carried anywhere, and it is an important issue to improve its vibration resistance performance against handling shock. Therefore, in combination with the increase in the capacity of recorded information, low flying height can be easily realized as compared with the conventional positive pressure type slider, and there is an urgent need for practical application of a negative pressure type slider that is relatively strong against vibration during flying.

The negative pressure type slider utilizes an air flow on the surface of a magnetic disk rotating at a high speed to generate a positive pressure that is a force in a direction away from the surface of the magnetic disk and a negative pressure that is a force that approaches the surface of the magnetic disk. While generating at the same time,
It is designed to keep the position where the positive pressure and the negative pressure balance each other, that is, the state where the surface of the magnetic disk and the magnetic head are separated by the same distance as the specified flying height. Since the force to maintain the flying height is stronger than the pressure slider, it is strong against external vibration,
Therefore, the flying height can be set smaller than that of the positive pressure slider.

However, when the flying height is set low, the contact start / stop method adopted in the positive pressure type slider (when the rotation of the magnetic disk is stopped, the magnetic head is in contact with the surface of the magnetic disk). ,
In the method in which the magnetic disk rubs against each other when it starts rotating and when it stops rotating), a small amount of dust is generated, so dust is caught in the gap between the magnetic disk and the magnetic head, and Accidents that destroy recorded information on the surface of the disk are likely to occur, and the contact surfaces between the magnetic head and the surface of the magnetic disk are mirror surfaces, so that the contact surfaces may stop while they are in contact with each other. There was also a phenomenon that the magnetic disks could not be rotated when the magnetic disk device was started up. Therefore, it is necessary to keep the negative pressure slider apart from the surface of the magnetic disk by a certain distance at all times when the slider is not floating so as not to contact the surface of the magnetic disk. However, unlike a positive pressure slider that generates only positive pressure, a certain amount of force is required to separate the floating negative pressure slider from the surface of the magnetic disk. If it is forcibly pulled away from the surface of the disk, the negative pressure slider will come into contact with the surface of the magnetic disk at the moment of separation,
This leaves a scratch on the surface of the magnetic disk, resulting in the destruction of recorded information.

Therefore, the elastic force of a flexure made of a thin metal plate for holding the negative pressure type slider is utilized so that a force that does not affect the flying height is always applied to the negative pressure type slider in the direction away from the surface of the magnetic disk. If the magnetic disk stops rotating, the positive pressure and the negative pressure generated in the negative pressure type slider will disappear at the same time, and only the elastic force of the flexure will work, and the negative pressure type slider will automatically move from the surface of the magnetic disk. It is possible to move away a certain distance without coming off and coming into contact with the magnetic disk.

An invention has been made in which the sliding time of the sliding surface of the magnetic head and the surface of the magnetic disk at the time of starting and stopping is shortened to reduce damage to both surfaces (for example, Japanese Utility Model Publication No. 61-38132). (See the official gazette).

[0007]

However, in the above conventional configuration, when the magnetic disk device is stopped,
Since the flexure is in the state of a cantilever having a negative pressure type slider at the tip, the tip of the flexure easily vibrates and is easily displaced due to external vibration or shock, and the magnetic head stops rotating when the magnetic field is stopped. There is a problem in that the disk may collide with or come into contact with the disk, scratch the surface of the magnetic disk, and destroy the recorded information.

The present invention solves the above-mentioned conventional problems. In the magnetic disk device, when the magnetic disk device is stopped, even if external vibration or shock is applied, the recorded information on the surface of the magnetic disk is not destroyed. An object is to provide a disk device.

[0009]

In order to achieve this object, the magnetic disk device of the present invention has a structure in which a flexure-restricting metal plate is provided between the flexure and the magnetic disk so as to stand substantially perpendicular to the magnetic disk. It is what

[0010]

In this structure, even if vibration or shock is applied from the outside, the displacement of the flexure is restricted by the metal plate so that the magnetic head does not come into contact with the magnetic disk.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

As shown in FIG. 1, the flexure 2 holding the magnetic head 1 is supported by an arm 4 which moves in a substantially radial direction of a magnetic disk 3. The front end of the flexure pressing member 5 is arranged on the side opposite to the magnetic disk 3 of the flexure 2, and the base of the inclined portion 5a at the other end is fixed to the base 6 with screws 7. The flexure pressing member 5 is formed by etching and is surface-treated to prevent abrasion and dust generation. The round pin 8 is formed integrally with the rotary lever 9, and the movable iron core 10 is driven in the direction indicated by the arrow A by an electromagnetic solenoid (not shown), so that the shaft 11 of the rotary lever 9 is rotated. And moves along the inclined portion 5a in the direction indicated by the arrow B. One end of the metal plate 12 is fixed to the rotary lever 9, and the other end is the hole 1 of the support plate 13.
It is disposed between the magnetic disk 3 and the bending rib portion 2a of the flexure 2 so as to pass through 3a. The metal plate 12 is
Since it is provided almost perpendicular to the surface of the magnetic disk 3, a strong impact is applied to the magnetic disk device itself from the outside, the flexure 2 vibrates, and even if the magnetic head 1 tries to approach the magnetic disk 3, the flexure 2 moves. Since the bending rib portion 2a hits the metal plate 12 first and restricts the displacement to the flexure 2, the magnetic head 1 does not approach the surface of the magnetic disk 3 within a certain distance, and the magnetic head 1 and the magnetic disk 3 do not come close to each other. It is configured not to contact the surface of the.

The operation of the magnetic disk device configured as described above will be described below.

The pressing operation of the flexure 2 is, as shown in FIG. 2 (a), the circular pin 8 in the direction indicated by the arrow B by an electromagnetic solenoid (not shown) while the magnetic disk 3 is rotating. When moved, the round pin 8 contacts the inclined portion 5a of the flexure pressing member 5 and the tip of the flexure pressing member 5 is displaced toward the flexure 2. When the round pin 8 further moves, the tip of the flexure pressing member 5 approaches the flexure 2 and contacts the flexure 2 to push the flexure 2 toward the magnetic disk 3 as shown in FIG. 2B. That is, the magnetic head 1 is moved closer to the magnetic disk 3, and the magnetic head 1 is levitated above the magnetic disk 3 so that the recording information can be recorded and reproduced. At this time, round pin 8
Of the flexure pressing member 5 itself flexes even if it goes too far in the direction indicated by the arrow B, the flexure pressing member 5 exerts a large force enough to bring the magnetic head 1 into contact with the magnetic disk 3. Flexure 2
Do not press. From this state, as shown in FIG.
When the round pin 8 is returned to its original position, the flexure pressing member 5 is also returned to the initial state.
Since the magnetic head 1 is suspended above the surface of the magnetic disk 1, the magnetic head 1 is floating above the magnetic disk 3 with a constant gap with a restraining force larger than the restoring force of the flexure 2, and the rotation of the magnetic disk 3 is stopped. The flexure 2 and the magnetic head 1 will not return to their original state unless they are provided.

A metal plate 12 for restricting the displacement of the flexure 2
3A, the flexure-regulating metal plate 12 is disposed between the flexure 2 and the magnetic disk 3 when the magnetic disk device is not in operation, as shown in FIG. The displacement in the direction of the disk 3 is restricted. When current is applied to the electromagnetic solenoid 14 from this state, the movable iron core 10 moves in the direction indicated by arrow A, and the other end of the rotary lever 9 moves in the direction indicated by arrow B. At this time, the metal plate 12 bends around the hole 13a of the support plate 13 as a fulcrum, and the tip of the metal plate 12 is displaced in the direction of the outer circumference of the magnetic disk 3 shown by the arrow C, as shown in FIG. 3 (b). Then, the flexure 2 is released from between the magnetic disk 3 and the flexure 2, and the displacement regulation of the flexure 2 is released.

Next, the timing of the above two operations will be described with reference to FIG. First, when the magnetic disk device is powered on and the magnetic disk 3 starts to rotate, as shown in FIG. 4A, the flexure 2 has its displacement regulated by the flexure regulating metal plate 12. Next, when the round pin 8 is driven by the electromagnetic solenoid and moved in the direction indicated by the arrow A, the metal plate 12 immediately begins to bend and is displaced in the outer peripheral direction of the magnetic disk 3,
As shown in (b), the flexure 2 is disengaged from between the flexure 2 and the magnetic disk 3, the displacement regulation of the flexure 2 is released, and the round pin 8 contacts the flexure pressing member 5. When the round pin 8 further moves in the direction indicated by the arrow A, as shown in FIG.
As shown in (c), the round pin 8 is provided on the flexure pressing member 5.
The tip of the flexure pressing member 5 is displaced in the direction of the flexure 2 and comes into contact with the flexure 2 so that the flexure 2 bends in the direction of the magnetic disk 3 and the magnetic head 1 floats above the magnetic disk 3. During this time, the metal plate 12 continues to bend, and the tip continues to be further displaced toward the outer circumference of the magnetic disk 3. When the operation for levitation is completed, the supply of electric current to the electromagnetic solenoid is stopped, and the round pin 8 is pushed back to its original position by the restoring force of the metal plate 12 and the flexure pressing member 5, as shown in FIG. 4 (d). . Round pin 8 and metal plate 12
The flexure pressing member 5 returns to its original position, but the magnetic head 1 and the flexure 2 immediately start reading and writing the record information and move to the record area of the record information because the magnetic head 1 is in the floating state. Go.

As described above, according to this embodiment, even if a strong shock is applied to the magnetic disk device, the contact between the magnetic head 1 and the magnetic disk 3 can be prevented, and the failure of the magnetic disk device can be prevented. Reliability can be improved.

[0018]

As is apparent from the above description, according to the present invention, a magnetic disk device is provided with a structure in which a flexure-restricting metal plate that stands substantially perpendicular to the magnetic disk is provided between the flexure and the magnetic disk. It is possible to realize an excellent magnetic disk device in which the recorded information on the surface of the magnetic disk is not destroyed even if external vibration or shock is applied while the disk is stopped.

[Brief description of drawings]

FIG. 1 is an external perspective view of a main part of a magnetic disk device according to an embodiment of the present invention.

FIG. 2 is a schematic sectional view showing a pressing operation of a flexure of the magnetic disk device.

FIG. 3 is a schematic plan view showing the operation of the metal plate of the magnetic disk device.

FIG. 4 is a schematic cross-sectional view showing timings of a flexure pressing operation and a metal plate operation of the magnetic disk device.

[Explanation of symbols]

 1 magnetic head 2 flexure 3 magnetic disk 4 arm 5 flexure pressing member (flexure moving means) 8 round pin (flexure moving means) 9 rotary lever (flexure moving means) 10 movable iron core (flexure moving means) 12 metal plate (displacement regulation) Means) 13 support plate (displacement restricting means) 13a hole (displacement restricting means)

Claims (4)

[Claims] 1. A magnetic head, a flexure holding the magnetic head, an arm supporting the flexure, flexure moving means for bringing the magnetic head close to the surface of the magnetic disk, and the magnetic head being the surface of the magnetic disk. A magnetic disk device provided with a magnetic head displacement regulating means that is prevented from approaching a certain distance or more. 2. The magnetic disk drive according to claim 1, wherein the flexure moving means and the displacement regulating means are driven by one common actuator. 3. The magnetic disk drive according to claim 1, wherein the displacement restricting means is composed of a flexure restricting metal plate provided between the flexure and the magnetic disk substantially perpendicularly to the surface of the magnetic disk. 4. The magnetic disk device according to claim 3, wherein the metal plate is removed from between the magnetic head and the magnetic disk by an actuator.