JPH03147579A - Magnetic head assembly - Google Patents

Abstract

PURPOSE:To eliminate a fact that a magnetic disk and a magnetic head slider come into contact with each other at the time of rotating the magnetic disk at low speed to suppress the wear of both of them, and to improve the reliability to a head crush by using a high polymer film which expands and contracts by pressure instead of a pressurizing spring. CONSTITUTION:A high polymer film can be allowed to expand and contract freely by pressure. By the air flow generated by rotation, a magnetic head slider 6 floats up by holding a clearance of a submicron degree from the surface of a magnetic disk 5 by an air bearing. That is, pushing force by air fed into a flexible high polymer film 12 constituted like a bag and push-up force of the air flow are balanced and the magnetic head slider 6 floats up stably. On the other hand, when the magnetic disk 5 is not brought to constant rotation, and when it is not used, the magnetic head slider 6 is separated completely from the magnetic disk 5 by restoration of a gimbals spring 9 due to a fact that the flexible high polymer film 12 constituted like a bag is deflated. In such a way, the magnetic disk 5 and the magnetic head 6 do not come into contact with each other, no wear powder is generated and the reliability to a head crush is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a magnetic disk device, and particularly to improving the reliability thereof.

[Conventional technology]

It is one of the external storage devices for computers. The main components of a fixed magnetic disk drive include a magnetic disk and a magnetic head assembly.

The concept is shown in the cross-sectional configuration diagram in FIG. In the figure, (
1) is the motor, (2) is the motor drive circuit, (3) is the spindle, (4) is the base, (5) is the magnetic disk (6) is the magnetic head slider, and 2 (7) is the pressure spring (
8) is a pivot, (9) is a gimbal spring, (10) is a support arm, and (11) is a head moving mechanism.

The magnetic disk (5) is a medium on which information is recorded and retained. A magnetic head slider (6) is held by a gimbal spring (9) and writes and reads recorded information on the magnetic disk (5). The suspension (7) is a spring that presses the magnetic head slider (6) against the magnetic disk (5) via the pivot (8).
0) and head moving mechanism (II) are magnetic head sliders.
Move (6) to an arbitrary position. A motor (1), a motor drive circuit (2), and a spindle (3) rotate the magnetic disk (5) in the direction of arrow A.

Hereinafter, in the fixed magnetic disk device configured as above, when information is written to or read from the magnetic disk (5), the magnetic disk is rotated at high speed (eg, 3600 rpm) in, for example, the six directions of the arrows.

The airflow caused by this rotation causes the magnetic head slider (6) to
floats above the surface of the magnetic disk (5) with a submicron gap maintained on the principle of air bearing. That is.

The magnetic head slider (6) is stabilized because the pressing force of the suspension (7) and the push-up blade of the air flow are balanced.

On the other hand, when the magnetic disk drive is not in use, the motor (1
), the spindle (3) stops rotating, and the magnetic head slider (6) is pressed against the suspension (a) and comes into contact with the magnetic disk (5).

5 and 6 are enlarged configuration diagrams showing the vicinity of the magnetic head slider (6) in FIG. 4, respectively.

FIG. 5 shows the state when the magnetic disk device is in operation (when the magnetic disk is rotating), and FIG. 5 shows the state when the magnetic disk device is stopped (when the magnetic disk is stopped).

[Problem to be solved by the invention]

In the magnetic disk device configured as above,
During low-speed rotation of the magnetic disk (5) when the magnetic disk (5) starts and stops rotating, the floating blades generated on the magnetic head slider (6) and the magnetic disk (5) are small and the two run in contact with each other. do. As a result, there is a problem in that the magnetic disk (5) and magnetic head slider (6) are scraped and abrasion powder is generated, causing a head crash.

This invention was made in order to solve the above-mentioned problems.The magnetic disk and the magnetic head slider do not come into contact with each other when the magnetic disk rotates at low speeds, thereby suppressing wear on both parts and improving reliability against head crashes. The purpose is to improve

[Means to solve the problem]

The magnetic head assembly of the present invention uses a polymer film that expands and contracts under pressure instead of a pressure spring.

[Effect]

Since the polymer film in the present invention can be freely expanded and contracted by pressure, the magnetic nodal slider can be brought arbitrarily close to the magnetic disk, and contact between the magnetic disk and the magnetic head can be avoided.

Therefore, generation of abrasion powder is prevented and reliability against head crashes is improved. Furthermore, the magnetic head slider and the magnetic disk are separated from each other when the magnetic disk drive is stopped, which also prevents adhesion phenomena.

In addition, the magnetic head assembly uses a polymer film that freely expands and contracts under pressure instead of a pressure spring, so that the magnetic disk and magnetic head slider can fly at low speeds when the magnetic disk rotates or stops. It has the function of eliminating contact when the blade is small. Moreover, even in a completely stopped state, the two do not contact each other.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. 1st
The figure shows a cross-sectional view of the magnetic head assembly of the present invention when the magnetic disk is stopped and rotating at low speed, and FIG. 2 shows a cross-sectional view of the magnetic head assembly when the magnetic disk is rotating steadily. (In Figure 2, there is actually a submicron air film between the magnetic disk and the magnetic head slider.) In the figure, (5) is the magnetic disk, (6) is the magnetic head slider 1, (8) is the pivot, ( 9) is a gimbal spring (10) is an arm, and (12) is a stretchable polymer membrane.

In a fixed disk device, when writing information to or reading information from a magnetic disk (5), the magnetic disk (5) is rotated at high speed, for example, at 3600 rpm in the direction of the 0 mark. Using the airflow generated by this rotation, the magnetic head slider (6) uses the principle of air bearing to move the magnetic disk (5).
) Float with a submicron gap above the surface. That is, the pushing force of the air sent into the bag-shaped stretchable polymer film (12) and the pushing blade of the air flow are in balance, and the magnetic head slider (6) stably floats.

On the other hand, when the magnetic disk (5) of the magnetic disk device is not rotating at a constant speed when the magnetic disk device is turned on or off, or when it is not in use,
The magnetic head slider (6) is completely separated from the magnetic disk (5) by the restoration of the gimbal spring (9) due to the air being removed from the stretchable polymer membrane (12) configured in a bag-like manner. 5) Since there is no contact between the magnetic head (6) and the magnetic head (6), no abrasion powder is generated, and reliability against rad crashes is improved.

FIG. 3 is a sectional view of a magnetic head assembly according to another embodiment of the present invention, in which a bag made of a stretchable polymer film is formed by completely separating the top and bottom.

In the above example, air was used to inflate the stretchable polymer membrane, but other gases, liquids, or a combination of both may be used, or a piston may be used instead of the stretchable polymer membrane. good.

〔Effect of the invention〕

As described above, according to the present invention, the spring that presses the magnetic head against the magnetic disk is made of a bag-shaped stretchable polymer film, and the pressure of the air introduced into the bag is controlled.

When the magnetic disk is not rotating normally, the magnetic head slider
The magnetic head slider moves away from the magnetic disk.
This has the effect of increasing reliability against head crashes by eliminating the generation of abrasion powder due to contact between the magnetic disk and the magnetic disk, and the effect of preventing the magnetic head slider and the magnetic disk from being attracted to each other when the magnetic disk drive is stopped.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a magnetic head assembly according to an embodiment of the present invention, showing a state in which the magnetic disk is not in steady rotation;
Figure 2 shows the magnetic disk in steady rotation, Figure 3 shows another embodiment in the same state as Figure 1, and Figure 4 shows a general magnetic disk drive. 5 and 6 are enlarged sectional views of the vicinity of the magnetic head slider (6) in FIG. 4. FIG. 5 shows the magnetic disk device when it is in operation, and FIG. 6 shows it when it is stopped. FIG. In the figure, (1) is the motor, (2) is the motor drive circuit, (3) is the spindle, (4) is the base, (5)
is a magnetic disk, (6) is a magnetic head slider 9 (7)
) is a pressure spring, (8) is a pivot, (9) is a gimbal spring, (10) is an arm, (11) is a head movement mechanism, (12) is a stretchable polymer membrane, (13) is an air hole, (
A) (B) is the direction of rotation of the magnetic disk. In the drawings, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Claims] In an assembly that holds a magnetic head that floats due to the airflow accompanying the rotation of a magnetic disk and records and reproduces information between the magnetic disk and the magnetic disk, a polymer film that expands and contracts under pressure is provided, and the expansion and contraction of this polymer film A magnetic head assembly is characterized in that a magnetic head is moved closer to or further away from a magnetic disk by utilizing the magnetic head.