JPH02210663A - Magnetic disk device - Google Patents

Abstract

PURPOSE:To decrease the contact friction of a magnetic recording medium and a head at the time of a contact start stop and to prevent the damage by floating the head when the rotating speed of the magnetic recording medium is below a prescribed value. CONSTITUTION:Air is blown from hole parts 80 of an air pipe 5 to a floating vane 1 to weaken the force of a spring 10 by the buoyancy of the floating vane 11 and the rotation of the disk 2 is started in the state of decreasing the contact friction of the head core 12 and the disk 2 at the time of starting the contact start action. The supply of the air is stopped when the rotating speed attains the predetermined value. The head core 12 is thereafter floated by its own buoyancy alone. The rotating speed lowers upon ending of writing and reading out of information. The contact friction of the head core 12 and the disk 2 is decreased by the buoyancy of the floating vane by the air blowing from the hole parts 80 and the rotation of the disk 2 is stopped when the prescribed rotating speed is attained. The supply of the air is thereafter stopped.

Description

[Detailed description of the invention] Kuokakuni! The present invention relates to a magnetic disk device, and more particularly to a magnetic disk device having a head section controlled by a contact start-stop method.

Conventionally, this type of magnetic disk device has been provided with a disc-shaped magnetic recording medium and a head for reading and writing information to and from the magnetic recording medium. When the magnetic recording medium is stopped, the magnetic recording medium and the head are in contact with each other. In this case, for contact
The load pressure applied to the throat core is controlled by the gimbal spring (Gin
The tension pressure was kept constant by the tension pressure of bal 5 prina).

Furthermore, at the time of contact start in a conventional magnetic disk device, the magnetic recording medium starts rotating while remaining in contact with the head. When the rotational speed exceeds a certain value, the head is lifted off the magnetic recording medium by wind pressure, and information is written and read in this state.

Furthermore, when writing and reading were completed and the rotational speed of the magnetic recording medium decreased below a certain value, the magnetic recording medium and the head came into contact again, after which the rotation of the magnetic recording medium stopped (contact). stop).

However, in the above-described conventional magnetic disk device, the contact friction between the recording medium and the head during contact start and stop was large, and the time during which the rotating recording medium and the head were in contact was long. Therefore, there is a drawback that the head may be damaged or the medium may be damaged.

An object of the present invention is to provide a magnetic disk device that can reduce contact friction between a magnetic recording medium and a head during contact start and stop.

A magnetic disk device according to the present invention includes a rotating magnetic recording medium, a head for writing predetermined data onto the magnetic recording medium, and a rotating speed when the rotation speed of the magnetic recording medium is below a predetermined value. The magnetic recording medium is characterized by comprising a separating means for separating the magnetic recording medium and the head.

Shakejyo week Hereinafter, the present invention will be explained in detail using the drawings.

FIG. 2 is a schematic configuration diagram of an embodiment of a magnetic disk device according to the present invention. In FIG. and a tachometer 1 that detects the number of rotations of the disk 2 per unit time. The magnetic disk drive according to this embodiment includes a head section 4, a carriage block 7 for positioning the head section 4, an air pipe 5, and an air flow rate control section 6.

A spring 10 having a head core at its tip is attached to the head portion 4, and the head core is pushed onto the surface of the disk 2 by this spring 10. In addition, 9 is a helad arm.

Further, a well-known air compressor is provided in the air flow control section 6 to adjust the flow rate of air injected from the hole of the air pipe 15.

Furthermore, control is carried out in which the air injected from the hole in the air pipe 5 pushes up the spring 10 of the head section 4 to reduce the contact friction between the head core and the disk at the time of contact, start, and stop. There is.

As shown in FIG. 1, the spring 10 is provided with buoyancy vanes 11, and by blowing air against the buoyancy vanes 11, the contact friction between the head core 12 and the disk 2 is effectively reduced. -ing In addition, 80
is a hole for injecting air.

The magnetic disk device of this embodiment having such a configuration is controlled as follows.

First, when the contact start operation is started,
An air valve (not shown) in the air flow control section 6 is opened, and air is blown from the hole 80 of the air nozzle 8 onto the buoyancy blades 11 . Then, the tension pressure of the spring 10 is lowered by the buoyancy of the buoyancy wing 11, and the head core 1
The rotation of the disk 2 is started in a state where the contact friction between the disk 2 and the disk 2 is reduced.

The rotational speed of the disk 2 is always detected by the tachometer 1, and thereby the rotational speed can be detected. and,
When the rotational speed reaches a predetermined value, the air flow control section 6 is notified of this fact. Then, an air valve (not shown) in the air flow control section 6 is closed, and thereafter the herad core 12 floats only by its own buoyancy. In this state, information is written and read.

When the writing/reading of information is completed, a stop operation is performed. In this case, a stop instruction is issued from a control section (not shown), and the rotational speed of the disk 2 gradually decreases.

When the number of revolutions of the disk 2 falls below a predetermined value, this is detected by the tachometer 1, and the air flow control section 6 is informed of this fact.

As a result, an air valve (not shown) in the air flow control section 6 is opened, and air is blown from the hole 80 of the air nozzle 8 onto the buoyancy blades 11 .

In this way, the buoyancy of the buoyant blades 11 causes the spring 1 to
The rotation of the disc 2 stops in a state where the tension pressure of 0 is lowered and the contact friction between the head core 12 and the disc 2 is reduced. At the same time as the rotation of the disk 2 is completed, an air valve (not shown) in the air flow control section 6 is closed, thereby ending the contact stop operation.

In other words, in this embodiment, the rotational speed of the disk is constantly detected by a tachometer, and air is supplied only from the time it starts rotating until it reaches a predetermined rotational speed and from the predetermined rotational speed until the rotation stops. By spraying the air onto the buoyancy blades, the spring tension pressure is lowered, reducing the friction between the head core and the disk, and preventing damage to the head and media.

Note that a method of blowing air during writing and reading may also be considered, but this is not a good idea because the tension pressure of the spring is unstable.

Furthermore, in this embodiment, buoyancy vanes are provided and air is blown against the buoyancy vanes to reduce the tension pressure of the spring. It is clear that the same effect can be obtained by changing the position of the air nozzle so as to spray the air. In this case, a flat spring (plate spring)
You can use .

North! As explained above, the present invention allows the head to fly when the rotational speed of the magnetic recording medium is below a predetermined value, thereby reducing the contact friction between the recording medium and the head and preventing damage. There is an effect that it can be done.

[Brief explanation of the drawing]

FIG. 1 is an enlarged view of a head portion of a magnetic disk device according to an embodiment of the present invention, and FIG. 2 is a schematic diagram of the main parts of the magnetic disk device according to an embodiment of the present invention. Explanation of symbols of main parts 1...Tachometer 2...Disc 5...Air pipe 10...Spring 12...Head core 80.・・・・・・Hole part

Claims (1)

[Claims] (1) A rotating magnetic recording medium, a head for writing predetermined data on the magnetic recording medium, and separating the magnetic recording medium and the head when the rotational speed of the magnetic recording medium is below a predetermined value. 1. A magnetic disk device comprising: a separating means for causing a separation.