JPH04125869A - Magnetic disk device - Google Patents

Abstract

PURPOSE:To avoid the damage and the adsorption phenomenon of a medium and magnetic heads at start time and stop time by constituting a magnetic disk device in such a way that a soft member such as soft metallic film is installed for suspensions and it is controlled. CONSTITUTION:When the metallic film 7 is pulled by a control bar 8, the magnetic heads 3 and 4 fixed to the suspensions 12 and 13 are fixed with a prescribed distance from the surface of the medium. If the control bar 8 is moved when it reaches speed with which the sufficient supporting force of air bearing is generated to the heads 3 and 4, the metallic film 7 comes to a 'slackened state' and the suspensions 12 and 13 are released. Then, the heads 3 and 4 are loaded on the surface of the medium by small pressing force. Since the mediums 1 and 2 previously reach speed with which the sufficient supporting force of the air bearing is generated, a system can be set to a state where magnetic storage can be executed without bringing the medium into contact with the heads 3 and 4.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a magnetic disk device, and particularly to a magnetic disk device equipped with a positioning mechanism for moving and positioning a magnetic head in the radial direction of a medium.

[Conventional technology]

Generally, in a magnetic disk drive, when the medium is stopped, the magnetic head is pressed onto the surface of the medium by a small force from a suspension. Therefore, when the magnetic disk drive is in operation and the medium begins to rotate, the medium and the magnetic head maintain contact until the rotational speed of the medium reaches a speed at which the medium generates sufficient air bearing support force for the magnetic head. do.

Furthermore, when the magnetic disk drive stops operating and the rotational speed of the medium drops below the rotational speed at which air bearing occurs, the magnetic head and the medium come into contact again.

In such magnetic disk drives, a liquid lubricant is applied to the surface of the medium to prevent damage to the magnetic head and medium during startup and stop.

[Problem to be solved by the invention]

The magnetic disk drive described above has very high medium surface accuracy and magnetic head slider surface accuracy, and a surface lubricant is applied on the medium surface.

Therefore, an attraction phenomenon occurs between the medium and the magnetic head.

Conventionally, adhesion between a medium and a magnetic head has been resolved by applying a large current to a motor for rotating the medium to separate the medium. In this method, power consumption is large due to the application of a large current, and problems such as damage to the medium and magnetic head due to forcible separation may occur.

[Purpose of the invention]

The present invention improves the disadvantages of the above-mentioned conventional example, and in particular, effectively prevents the attraction of the magnetic head to the magnetic disk during startup, and effectively prevents damage to the magnetic head that is likely to occur during startup. The purpose is to provide a magnetic disk device that can perform the following steps.

[Means to solve the problem]

The present invention includes a medium that is rotated by a motor, a magnetic head that is placed opposite to the medium through an air layer when the medium rotates, and a positioning mechanism that supports the magnetic head and moves it in the radial direction of the medium. It is equipped with This positioning mechanism includes an actuator arm that rotates one end in an arc.

The structure includes a pair of suspensions that are installed at the rotating end of the actuator arm and support the magnetic head. A soft member is provided between the pair of suspensions to connect the suspensions, and
A control bar is disposed between the suspensions to press the central portion of the soft member in the radial direction of the medium as necessary;
It has this configuration. This aims to achieve the above-mentioned purpose.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 to 3.

The embodiment shown in FIGS. 1 to 3 consists of a medium 1.2 that is rotated by a motor, and a magnetic head 3.4 that is provided facing the medium 1.2 through an air layer when the medium 1.2 rotates. and,
A positioning mechanism 5 that supports the magnetic head 3.4 and moves it in the radial direction of the medium 1.2 is provided. The positioning mechanism 5 includes an actuator arm 11 whose one end rotates in an arc shape, and a pair of suspensions 12 and 13 that are installed at the rotary ends of the actuator arm 11 and support the magnetic heads 1 and 2 separately. It is configured with the following. Further, between the pair of suspensions 12 and 13 described above, the suspension 12
．． Equipped with a metal film 7 as a soft member connecting 13,
The central portion of this metal film 7 may be replaced with the medium 1 described above as needed.
Two radially pressing control bars 8 are arranged between the aforementioned suspensions 12,13.

To explain this further, in FIG. 1 a suspension 12.13 is supported on a conventional actuator arm 11. The suspension 12.13 fixedly supports the magnetic head 3.4. Suspension 12.1
The metal membrane 7 attached to connect the control bar 8
By moving the magnetic head 3.4, the magnetic head 3.4 can be raised and lowered above the medium surface (not shown).

FIG. 2 shows contact between the media 1, 2 and the magnetic head 3.4 onto a media surface rotating at a speed that provides sufficient air bearing support for the magnetic head 3.4 according to an embodiment of the present invention. FIG. 4 is a diagram illustrating a process of creating a state in which magnetic storage is possible without causing any damage.

First, the metal membrane 7 attached to connect the suspensions 12 and 13 is moved by the control bar 8 at the arrow A in FIG.
The suspension 12 is pulled in the direction of
．． A magnetic head 3.4 fixed to the magnetic head 13 is fixed at a certain distance from the surface of the medium.

Next, when the media 1 and 2 start rotating and reach a speed that generates sufficient air bearing support force for the magnetic head 3.4, the control bar 8 is moved in the direction of arrow B in FIG. The membrane 7 becomes "slack" and the suspension 1
2.13 will be released. For this reason, the suspension 12
．． The magnetic head 3.4 attached to the magnetic head 13 is loaded onto the medium surface by a small pressing force. Already at this time,
Since the medium 1.2 has reached a speed that generates sufficient air hair ring support force to the magnetic heads 3 and 4, the medium 1.2
It is possible to create a state in which magnetic recording is possible without bringing the magnetic head 3.4 into contact with the magnetic head 3.4.

〔Effect of the invention〕

As explained above, according to the present invention, a soft member such as a flexible metal film is installed on the suspension that applies a small force to the magnetic head, and this is controlled. By the action of the soft member in the mechanism and the control bar, it is possible to provide an unprecedented and excellent magnetic disk device that can effectively avoid damage to the medium and magnetic head and adhesion phenomenon at the time of starting and stopping. .

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing one embodiment of the present invention, and FIGS. 2 and 3 are explanatory diagrams showing the operation of FIG. 1, respectively. 1.2...Medium, 3.4...Magnetic head, 5...Positioning mechanism, 7...Metal film as a soft member, 8... ...Control bar 11.
...Actuator arm, 12.13...
···suspension. Applicant Ibaraki NEC Co., Ltd. Agent Patent Attorney Yudai Takahashi! Figure Figure Figure

Claims (1)

[Claims] (1) A medium that is rotated by a motor, a magnetic head that is installed facing each other with an air layer in between when the medium rotates, and a positioning mechanism that supports this magnetic head and moves it in the radial direction of the medium. A magnetic disk drive comprising: an actuator arm that rotates the positioning mechanism in an arc shape at one end; and a pair of suspensions that are installed at the rotary ends of the actuator arm and support the magnetic head. A control bar is provided between the pair of suspensions to connect the suspensions, and a control bar presses the center of the soft member in the radial direction of the medium as necessary.
A magnetic disk device characterized in that the suspensions are arranged between the suspensions.