JPS62264489A - Disk device - Google Patents

Abstract

PURPOSE:To prevent the erasing action due to bringing a head into contact with a memory media by bridging a shrinking material composed of a shape memory alloy to shrink at a heat receiving temperature, and energizing the head so as to separate from the memory media at the time of starting and stopping. CONSTITUTION:Between inclining parts 11 of respective suspensions 10, a shrinking material 14 is bridged, and at both edges, an electric current impressing line 15 composed of a lead wire and so on to conduct and heat the shrinking material 14 is connected. The shrinking material 14 is formed to a coil spring shape by using a shape memory alloy, and the shrinking shape is changed by a room temperature condition and a heat receiving condition. At the time of starting the spindle 2, the electric current flows at the electric current impressing line 15, a joule heating is generated, the shrinking material 14 is reduced under the time of the room temperature, then, the energizing force is also decreased, respective suspensions 10 are displaced in the mutually approximating direction and a magnetic head 7 floats up very slightly from a magnetic media 3. Thus, at the time of starting and stopping the rotation of the spindle, the head will not execute the action to erase the memory media.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a disk device, and particularly to regulating the contact operation of a head with a storage medium.

[Conventional technology]

Conventionally, a magnetic disk device has a spindle 2, which is rotated by a drive source such as a motor, in a device main body 1, as shown in FIG.
is attached to the spindle 2, and a disk-shaped magnetic medium 3 as a tl'y medium is attached to and detached from the spindle 2.

In addition, the actuator 4 with the actuator arm 5 attached is attached to the device main body l, the suspension 6 is attached to the tip of the actuator arm 5, and the magnetic nodule 7 is fixed 7j to the tip of the suspension 6. ,
This magnetic hemometer F7 is arranged so as to be in contact with the magnetic medium 3.

In addition, 8 is a cover that is attached to the main body of the device so that it can be opened and closed freely.
Close the cover 8.''
: becomes.

In this disk device, before the spindle 2 is started, the magnetic head 7 is pressed against the magnetic medium 3 by the suspension 6 and brought into contact with the magnetic medium 3.

The spindle 2 rotates when current is supplied to the motor, and the magnetic medium 3 also rotates thereby. At this time,
The magnetic head 7 gradually floats away from the magnetic medium 3 from the contact state due to the action of buoyancy as the number of rotations increases.

When the rotation speed reaches a constant rotation speed, the actuator 4 and the actuator arm 5 turn it into a magnetic field.
is positioned on a predetermined track and reads and writes data.

Further, as the number of rotations decreases, the magnetic head 7 gradually comes into contact with the magnetic medium 3, and as soon as the rotation stops, the magnetic head 7 comes into contact with the magnetic medium 3 completely.

The series of operations described above are performed in a closed container with a closed cover 8, and extremely clean air is circulated within this closed container to ensure the flying operation of the magnetic head 7.

[Problem that the invention seeks to solve]

However, in the disk device having the above structure, since the magnetic head is in contact with the magnetic medium when the rotation of the magnetic medium is started and stopped, it is necessary to prevent the magnetic medium from being scraped due to this contact. For this reason, pressing with the ζ■ air head requires adjustment to lower the pressure and countermeasures such as applying surface lubricant, making handling difficult. Furthermore, if the amount of surface lubricant applied is too large, the magnetic head will be attracted to the magnetic medium, whereas if it is too small, undesirable phenomena such as damage to the magnetic layer will occur, resulting in a problem of lowering reliability.

The present invention was made in view of the above problems, and its purpose is to provide a disk device that prevents the scraping action that occurs when the head comes into contact with the storage medium by attaching an elastic material to the suspension that expands and contracts at the heat receiving temperature. The purpose is to donate money.

Means for Solving Problem C] To achieve the above object, the present invention bridges each suspension with an elastic material made of a shape memory alloy that expands and contracts at the heat receiving temperature.

[Effect]

With this configuration, when the spindle is started and stopped, the elastic material receives heat and contracts, so that the disk floats slightly above the storage medium and does not come into contact with the storage medium. Therefore, no scraping action of the storage medium occurs due to contact.

〔Example〕

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

1 and 2 show an embodiment of the present invention. In this embodiment, the same or equivalent members and parts as those in the conventional example described above are given the same reference numerals, and the explanation thereof will be omitted.

In the magnetic disk drive according to the present invention, a pair of suspensions 10, 10 are attached to the tips of the actuator arm 5 with their tips tilted away from each other.

The suspension 10 includes at least two magnetic media 3,
A magnetic head 7.7 can be attached to and separated from both opposing surfaces 3a, 3a of the magnetic head 3, and its structure is as described below.

That is, an inclined portion 11 is provided which is inclined in a direction away from each other from the actuator arm 5 side to the magnetic medium 3 side, and the opposing surface 3a of the two air media 3,3 is provided.

A mounting part 12 is provided at one end of the 3a side, and a fixing part 13 is provided at the other end.The magnetic head 7 is attached to the mounting part 12, and the fixing part 13 is fixed to the actuator arm 5.

Further, an elastic member 14 is bridged between the inclined portions 11 of each suspension 10, and current application wires 15 made of, for example, lead wires are connected to both ends of the elastic member 14 for heating the elastic member 14. .

The expandable member 14 is formed into a coil spring shape using a shape memory alloy, and its expandable shape changes between a room temperature state and a heat receiving state.

The biasing force of the suspension IO of the elastic material 14 is set to change according to this change in the elastic shape. At room temperature, the elastic member 14 is in a state where the suspensions 10 are separated from each other, as shown by the solid lines in FIG. Due to this bias, the magnetic head 7 is in contact with the opposing surface 3a of the magnetic medium 3, but in this case, the rotation of the spindle 2 has completely stopped, so the magnetic head 7 is・＼ Soto 7 will not scrape the magnetic medium 3.

On the other hand, during startup before rotating the spindle 2, a current is passed through the current application line 15 to heat the elastic material 14 and cause Joule heat generation.

Due to this Joule heat generation, the elastic material 14 changes from its shape at room temperature to the shape h'IN /JX, and its biasing force also decreases. This reduction in urging force causes the suspensions 10 to move toward each other as indicated by dotted lines in FIG. 1, and this displacement causes the magnetic head 7 to float slightly above the magnetic medium 3.

From this state, the spindle 2 is rotated, and when the rotation speed reaches a specified rotation speed of about 150 ORPM, the current supply to the current application line 15 is gradually reduced and the current is supplied near the constant rotation speed. stop.

At this time, due to the buoyant force generated on the magnetic head 7 side, the magnetic head 7 separates from the magnetic medium 3 and does not come into contact with it.

Furthermore, when the spindle 2 is stopped, if the necessary 7-up distance G' between the magnetic head 7 and the magnetic medium 3 cannot be maintained correctly due to a decrease in the rotational speed of the spindle 2, the current application line [
Electric current is supplied to the expandable member 14 to heat the expandable member 14, thereby reducing its shape and reducing its biasing force.

At this time, as shown by the dotted lines in FIG. 1, the suspensions 10 are displaced toward each other, causing the magnetic head 7 to float slightly above the magnetic medium 3.

Then, when the rotation of the spindle 2 completely stops, the current supply is gradually reduced, and when the magnetic head 7 comes into contact with the contact medium 3, the current supply is completely stopped.

As a result, the elastic material 14 returns to its shape at room temperature.

In this embodiment, the contraction effect of the elastic member 14 is used to raise the magnetic head 7'P above the magnetic medium, but the expansion effect may also be used. Also, Shin4ijLt
z is not limited to the shape of a coil spring, and may be, for example, plate-shaped or rod-shaped.

〔Effect of the invention〕

As explained above, the present invention bridges each suspension with an elastic material using a shape memory alloy, and connects the suspension to the suspension in such a way that its shape contracts at the time of starting and stopping, and causes the head to slightly float above the recording medium. It is characterized by changing the urging force of.

Therefore, when the spindle, that is, the storage medium, starts and stops rotating, the storage medium will not be scraped. As a result, the degree of wear on the head and the storage medium is significantly reduced, extending their lifespan, thereby improving the reliability of the disk device.

[Brief explanation of drawings]

FIG. 1 is a schematic side view of a disk device according to the present invention, and FIG.
The figure is a schematic side view of an eggplant pennoyon, and FIG. 3 is a partially cutaway plan view 1 of a conventional example. 3...Magnetic medium (medium 1a), 5...Actuate arm, 7...Magnetic head, 10...Suspension, 14...(III Itachi. Agent: Masuo Oiwa (and 2 others) Name) Atsushi 1 Figure 2 Figure 3 Figure 4 Rit) 7 Procedural amendment (voluntary

Claims (2)

[Claims] (1) From the tip side of the actuator arm, two opposing
In a disk device in which two suspensions are provided that extend obliquely in the direction of both opposing surfaces of a storage medium, and a head is attached to the tip side of the suspension, a shape memory alloy that expands and contracts at the heat-receiving temperature is disposed between each of the suspensions. What is claimed is: 1. A disk device comprising: bridging an elastic material made of the above, and changing the temperature of the elastic material so that it contracts when the storage medium is started and stopped, thereby urging the head to move away from the storage medium. (2) The disk device according to claim 1, wherein the elastic member is formed in the shape of a coil spring that expands and contracts when electricity is generated.