JPS5829176A - Magnetic disc device - Google Patents

Abstract

PURPOSE:To obtain a device possible for smooth start without consideration of giving damage to a magnetic head and a magnetic disc at start, by providing a ultrasonic wave oscillator providing high frequency oscillation for the magnetic head and the magnetic disc. CONSTITUTION:A magnetic head 3 and a magnetic disc 2 are provided for an ultrasonic wave oscillator 5 giving high frequency oscillation. For example, the magnetic disc 1 is supported and turned with a magnetic disc support and turning device 2, and the magnetic head 3 is supported with a magnetic head arm 6 loaded to a movable arm assembly 4 and opposed to the magnetic disc 1 and the ultrasonic wave oscillator 5 is provided at the movable arm assembly 4. Ahead the start, the oscillator 5 is operated for 1-2min, an up-and-down oscillation is given to the magnetic head 3, and after the magnetic head 3 and the magnetic disc 1 are adsorbed, they are released and water content remaining between them is evaporated with the heating effect.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to improvements in magnetic disk drives. More specifically, it relates to the improvement of a magnetic disk device that includes a magnetic disk supported by a magnetic disk support rotation device, a magnetic head supported by a movable arm assembly, a head body, an electronic circuit section, and other auxiliary mechanisms. .

Magnetic disk drives have excellent random accessability and can be accessed in a short time; storage capacity can be easily increased by replacing magnetic disks; information is highly reliable; Due to its relatively low price, it is widely used as a storage device for electronic computers.

As a magnetic disk, acicular magnetic particles riron trioxide (
So-called coated magnetic disks are often used, which are made by mixing Fezes with a binder and coating it on a disk-shaped aluminum (A1) synthetic substrate. right.

The magnetic head floats a distance of several micrometers to a fraction of a micrometer above the magnetic disk, but if the magnetic disk drive stops operating and the magnetic disk is not rotating, the airflow like the one on the left does not exist, and the magnetic head flies. It comes into contact with and stops on the C88 (contact start/stop) zone of the magnetic disk. When starting up the magnetic disk device, the magnetic head starts up while rubbing against the magnetic disk since there is no floating blade due to the air flow. However, when the magnetic disk drive is stopped, the magnetic head and magnetic disk stick to each other, preventing smooth startup, and in some cases, mutual friction between the magnetic head and the magnetic disk can cause damage to both. There is a drawback. The method conventionally employed to overcome this drawback is to forcefully move the magnetic head manually, but this is a temporary operation and is unsatisfactory as a countermeasure against adsorption.

An object of the present invention is to eliminate this drawback, and a magnetic disk is supported and rotated by a magnetic disk support rotation device, and during operation of the magnetic disk device, a magnetic head supported by a movable arm assembly is moved by an air flow. In a magnetic disk drive in which the magnetic disk drive is started using the C8S method (contact start/stop method), the magnetic disk drive is brought into contact with the magnetic disk with an extremely small amount of leeway by a floating blade. The object of the present invention is to provide a magnetic disk device that reduces the adhesion force between the magnetic disk and the magnetic head that occurs during the stoppage of the device, smoothes its startup, and eliminates the risk of damaging the magnetic head or magnetic disk during startup. The gist is that a magnetic disk drive is equipped with an ultrasonic oscillator, which applies high-frequency vibrations to the magnetic head and magnetic disk prior to startup, and forces them to attract each other in a very short time, i.e., within 1 to 2 minutes. When the condition is released, the moisture accumulated between them is also evaporated by heat generation based on high frequency vibration. Note that this ultrasonic oscillator is attached to the movable arm assembly IJ.
It is advantageous to install K.

Below, the process of the present invention from conception to implementation will be explained, and the structure and unique effects of the present invention will be clearly explained.

The inventor of the present invention believes that the adhesion between the magnetic disk and the magnetic head occurs due to the physical and chemical action of dust and other sticky substances in the air and moisture while the device is stopped, and upon startup, By forcibly applying slight vibrations to the contact area between the magnetic head and the magnetic disk, this sticky state can be resolved.
The idea was to smooth the startup of the device and prevent damage to the magnetic head and magnetic disk.

Therefore, in order to confirm the effectiveness of this idea, the movable arm assembly KJIi1 of a magnetic disk drive is developed in the prior art, with a wave number of 1 to several KH! Equipped with an ultrasonic oscillator with variable intensity, the device is stopped for about 10 to 20 hours, and then restarted repeatedly with or without using the above ultrasonic oscillator, and at the same time changes the ultrasonic frequency. Experiment tIIk
When I returned a and observed the results, I found that the amplitude was several μm and the frequency was IKH! We have confirmed that the above idea has a definite effect on ultrasonic waves of this level.

DESCRIPTION OF THE PREFERRED EMBODIMENTS A magnetic disk device according to an embodiment of the present invention will be described below with reference to the drawings, and the configuration and unique effects of the present invention will be clarified. The figure is an elevational view of a magnetic disk supporting and rotating device, a movable arm assembly that supports a magnetic head, a head positioner, and an ultrasonic oscillator according to the gist of the present invention in a magnetic disk drive according to an embodiment of the present invention. In the figure, it is an IFi magnetic disk and a 2Fi magnetic disk.
In the magnetic disk support and rotation device, 3 is a magnetic head, which is supported by a movable arm assembly 4.

As mentioned above, when the magnetic disk device is in use, there is a very small gap between several micrometers to a fraction of a micrometer between the magnetic helad 3 and the magnetic disk 1 due to the floating blade caused by the air flow.
The magnetic disk 1 and the magnetic head 2 are not in contact because there is a clearance of 1, but in the stopped state there is no floating blade due to the airflow, so the magnetic disk 1 and the magnetic head 2 are in contact. 5 is an ultrasonic oscillation device according to the gist of the present invention.

In this embodiment, the movable arm assembly 4 is mounted on a movable arm assembly 4 for the purpose of simultaneously applying vibration to a plurality of magnetic heads to release them from the attracted state, and for the purpose of applying ultrasonic wave This is a measure to omit the additional operation of moving the oscillator 5 after it becomes unnecessary, and it goes without saying that it does not prevent the oscillator 5 from being mounted on each magnetic helad arm 6. In addition, in order to improve the vibration propagation efficiency when the ultrasonic oscillator 5 is installed in a relatively remote area from the magnetic head 3 as in this embodiment, it is necessary to select the mass of each member as well as the distance between each member. Needless to say, sufficient consideration must be given to the joining method, etc.

To start up the magnetic disk device, the ultrasonic oscillator Is is operated for 1 to 2 minutes to give vertical vibration to the magnetic head [I\PK] to release the magnetic head 3 and magnetic disk 1 from the adsorbed state, and It uses a heating effect to evaporate moisture. As a result, startup is performed smoothly and no damage is caused to the magnetic disk 1 or the magnetic head 3.

As explained above, according to the present invention, the magnetic disk is supported and rotated by the magnetic disk support rotation snowmaking, and during the operation of the magnetic disk drive, the magnetic head supported by the movable arm assembly is moved by the floating blade by the air flow. In a magnetic disk drive in which the magnetic disk is brought into contact with the magnetic disk with an extremely small amount of clearance, and the magnetic disk drive is started using the C8S method, an ultrasonic oscillator is provided to apply high frequency vibrations when starting the a-air disk drive. When starting up, this device must be installed once.
To provide a magnetic disk device which has smooth start-up because the magnetic head part is released from the adsorbed state after being operated for only 2 minutes, and which does not have the disadvantage that the magnetic disk and magnetic head are damaged due to friction during start-up. be able to.

[Brief explanation of the drawing]

The figure is an elevational view of a magnetic disk support and rotation device for mounting a magnetic disk according to an embodiment of the present invention, a movable arm assembly that supports a magnetic head via a magnetic helad arm, and an ultrasonic oscillator according to the gist of the present invention. It is a diagram. l...Magnetic disk, 2...Fist magnetic disk support and rotation device, 3...Magnetic head. 4...Movable arm assembly, 5...Ultrasonic oscillator, Todo magnetic herad arm. q+−I+→′

Claims (2)

[Claims] (1) It has at least one magnetic disk, and maintains a slight clearance on the surface of the magnetic disk, and the surface K
fg has at least one magnetic head movably supported by a movable arm assembly; the movable arm assembly has a magnetic head driven by the head body;
A magnetic disk device comprising an ultrasonic oscillator that applies high frequency vibrations to the magnetic head and the magnetic disk. (2) The ultrasonic oscillator is mounted on the movable arm assembly. *A magnetic disk device according to claim 1.