JPS6383956A - Magnetic disk device - Google Patents

Abstract

PURPOSE:To prevent the accident due to attraction without having an influence on a magnetic head or a magnetic disk plate by sliding the magnetic head in accordance with ambient temperatures of the magnetic head and the magnetic disk plate and the temperature of a vessel where the magnetic head and the magnetic disk plate are stored. CONSTITUTION:A temperature detector 8 arranged near a magnetic head 3 and a magnetic disk plate 2 detects the ambient temperature of the magnetic disk plate 2 and the magnetic head 3, and the detection signal is sent to a control circuit 7. The control circuit 7 judges the output signal of the temperature detector 8 when receiving the start signal of a spindle motor 1; and if this output signal indicates that a certain temperature or higher is detected, the spindle motor 1 is driven by a motor driving circuit 6 to rotate the magnetic disk plate 2. If the detection temperature of the temperature detector 8 exceeds a certain value, a carriage 4 is driven by a servo circuit 5 to slide the magnetic head 3 in the search direction before the spindle motor 1 is driven.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to magnetic disk installation, and particularly to a C5S type magnetic disk device.

[Prior Art] In a C3S type magnetic disk drive, a magnetic head is in contact with the magnetic disk plate when the magnetic disk plate stops rotating.

On the other hand, with the recent remarkable increase in magnetic recording density, it has become necessary for magnetic heads and magnetic disk plates to have extremely high surface roughness or flatness. For this reason, when the magnetic head and the magnetic disk plate come into contact with each other, an attraction phenomenon occurs between the two, which may increase the sliding friction between the magnetic head and the magnetic disk plate.

In such a case, when the magnetic disk plate is rotated, excessive stress is applied to the magnetic head in the direction of rotation by the magnetic disk plate, which may sometimes damage the magnetic head or the magnetic disk plate.

For this reason, in conventional magnetic disk drives, before rotating the magnetic disk plate, the magnetic head is moved a very small amount in the search direction on the surface of the magnetic disk plate, and the sliding friction between the magnetic head and the magnetic disk plate is This is intended to prevent damage to the magnetic head or magnetic disk plate due to the above-mentioned attraction phenomenon.

[Problems to be solved] However, even with the above method, when the magnetic disk plate is stopped, the magnetic head can be
Since the magnetic head is slid in a search direction different from that during SS, excessive stress different from normal stress is applied to the magnetic head.

In conventional devices, this type of operation is performed every time the magnetic disk plate is rotated, which may reduce the reliability of the magnetic head or magnetic disk plate.For this reason, if the amount of sliding is limited, The disadvantage was that it reduced the effectiveness of

Therefore, in the present invention, a magnetic disk device is capable of preventing damage to the magnetic head or the magnetic disk plate due to the attraction phenomenon between the magnetic head and the magnetic disk plate, without affecting the magnetic head or the magnetic disk plate in any way. The purpose is to provide

[Means for Solving Problems] A magnetic disk device of the present invention that solves the above conventional problems includes a magnetic disk plate that is rotationally driven, and a magnetic head that is positioned by sliding in the radial direction of the magnetic disk plate. , a temperature detector for measuring the temperature around the magnetic head and the magnetic disk plate or the temperature of a container housing the magnetic head and the magnetic disk plate; The apparatus is configured to include a control means for controlling the magnetic spatula to slide in the search direction on the surface of the magnetic disk plate before starting up the apparatus and rotating the magnetic disk plate.

[Example] Hereinafter, the present invention will be described in detail with reference to the drawings. FIG. 1 is a block diagram showing the circuit configuration of a magnetic disk device according to an embodiment of the present invention.

In the figure, 1 is a spindle motor driven by a drive signal from a motor drive circuit 6, and the magnetic disk plate 2 is rotationally driven by this spindle motor 1. A magnetic helad 3 mounted on a carriage 4 is arranged to face the magnetic disk plate 2 .

The carriage 4 positions the magnetic head 3 in the radial direction of the magnetic disk plate 2 in response to a control signal from the servo circuit 5.

A temperature detector 8 is disposed near the magnetic helad 3 and the magnetic disk plate 2. This temperature detector 8 detects the temperature around the magnetic disk plate 2 and the magnetic head 3, and sends the detection signal to the control circuit 7.

In such a configuration, in the magnetic disk drive of the present invention, when the control circuit 7 receives the activation signal of the spindle motor 1, it judges the output signal of the temperature detector 8, and if it detects a temperature equal to or higher than that, the control circuit 7 immediately controls the output signal. A spindle motor 1 is driven by a motor drive circuit 6 to rotate a magnetic disk plate 2.

If the temperature detected by the temperature sensor 8 exceeds the value,
Before driving the spindle motor 1, the carriage 4 is driven by the servo circuit 5 to move the magnetic head 3 in the search direction.

The attraction force generated between the magnetic helad 3 and the magnetic disk plate 2 is
This is largely related to the humidity of the surroundings where the magnetic head 3 and magnetic disk plate 2 are placed, and is likely to occur when the humidity is high. Furthermore, if the temperature around the magnetic head 3 and the magnetic disk plate 2 is low, the humidity will be high.

Therefore, in the magnetic disk device of the present invention, the temperature around the magnetic head 3EL and the magnetic disk plate 2 or the temperature of the container housing the magnetic head 3 and the magnetic disk plate 2 is measured, and the magnetic disk plate 2 is rotated. At this time, the measured value is used to search for the sliding movement of the magnetic head 3 before the magnetic disk plate rotates.

[Effects of the Invention] As explained above, the magnetic disk device of the present invention prevents damage to the magnetic head or the magnetic disk plate caused by rotating the magnetic disk plate when the magnetic head and the magnetic disk plate are in an attracted state. In order to do this, the magnetic head is slid in the search direction before the magnetic disk plate rotates, but the attraction force generated between the magnetic head and the magnetic disk plate increases the temperature of the surrounding area where the magnetic head and magnetic disk plate are placed. By taking advantage of the relationship between the magnetic head and the magnetic disk plate, the sliding movement of the magnetic head is performed appropriately depending on the temperature around the magnetic head and the magnetic disk plate or the temperature of the container in which the magnetic head and the magnetic disk plate are stored. Therefore, there is an effect that self-adhesion can be prevented without affecting the magnetic head or the magnetic disk in any way.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the circuit configuration of a magnetic disk device according to an embodiment of the present invention. 1 Spindle motor 2: Magnetic disk plate 3: Magnetic head 4: Carriage 5: Servo circuit 6: Motor drive circuit 7 2 Control circuit 8: Temperature detector

Claims (1)

[Claims] A magnetic disk plate that is rotationally driven, a magnetic head that is positioned by sliding in the radial direction of the magnetic disk plate, and a temperature around the magnetic head and the magnetic disk plate, or a temperature of the magnetic head and the magnetic disk plate. A temperature detector is provided to measure the temperature of the container in which the container is stored, and the magnetic head is moved to the surface of the magnetic disk according to the measured value of the temperature detector before starting the device and rotating the magnetic disk. 1. A magnetic disk drive, comprising: control means for controlling the top of the disk to slide in a search direction.