JPH0945026A - Magnetic disc apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a head from crushing because of shocks. SOLUTION: A stopper 5a, 5b is provided which has the same rotating center as a carriage 3a, 3b supporting a head 4a, 4b and enters between a head- supporting part of the carriage 3a, 3b and a magnetic recording medium 1 to secure a space between the head-supporting part and magnetic recording medium. When a shock is applied, a vibration detection signal output from a vibration detector 7 exceeds a reference value, which is detected by a control device 8. The control device 8 feeds a driving instruction to a stopper-driving device 6 to drive the stopper 5a, 5b to enter between the head-supporting part and the magnetic recording medium 1. Accordingly, before the head 4a, 4b comes in touch with the magnetic recording medium 1, the head-supporting part is regulated by the stopper 5a, 5b, so that the head is prevented from crushing.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic disk device, and more particularly to a technique for a head crash prevention mechanism.

[0002]

2. Description of the Related Art Generally, a magnetic disk device rotates a disk-shaped magnetic recording medium at a high speed and records and reproduces data while the head is slightly above the magnetic recording medium by the wind pressure generated at that time. There is. However,
In the conventional magnetic disk device having the above structure, when a shock is applied during the operation, the head comes into contact with the magnetic recording medium, and a head crash easily destroys the data.

[0003]

As described above, the conventional magnetic disk device has a problem that, when an impact is applied, the head comes into contact with the magnetic recording medium and the data is destroyed, resulting in a head crash. It was An object of the present invention is to provide a magnetic disk device capable of solving such a problem and preventing a head crash due to a shock.

[0004]

A magnetic disk device of the present invention for solving the above-mentioned problems includes a head for recording and reproducing data on and from a magnetic recording medium, and a vibration detecting means for detecting vibration of the head. And a head restricting means for restricting the head from contacting the magnetic recording medium when vibration is detected by this means. With this configuration, the head is prevented from crashing by restricting the head from coming into contact with the magnetic recording medium during vibration detection.

The head regulating means is located between the head supporting portion of the carriage and the magnetic recording medium at the same center of rotation as that of the carriage supporting the head and keeps a distance therebetween, and the vibration detecting means. A stopper drive device that drives the stopper so as to enter between the head support portion and the magnetic recording medium according to the detection output, and the stopper drive when the vibration detection signal obtained by the vibration detection means reaches a reference level. And a control device that gives a drive command to the device. In this configuration, when the vibration detection signal reaches the reference level due to the occurrence of vibration, a drive command is issued from the control device, and the stopper is driven by the stopper drive device to enter between the head support portion of the carriage and the magnetic recording medium. , Keep the distance between them.
This prevents a head crash when vibration occurs.

Further, the control device is provided with a power-off detection function, and a drive command is given to the stopper drive device when the power-off is detected. This allows
Handles shocks when not in use.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 shows the configuration of a magnetic disk device according to the present invention. (A) is an overall configuration diagram,
FIG. 1B is a side view when the structural portion of FIG. 1A is viewed from the direction A in the drawing.

In FIG. 1, reference numeral 1 is a disk-shaped magnetic recording medium (disk) which is rotated at a high speed. A support shaft 2 is arranged in the vicinity of the magnetic recording medium 1, and a pair of carriages 3a and 3b are provided from the support shaft 2 to the upper and lower surfaces of the magnetic recording medium 1.
Is extended. Heads 4a and 4b are attached to the tips of the carriages 3a and 3b, respectively. That is, the heads 4a and 4b are movable in the radial direction of the magnetic recording medium 1 by rotating the carriages 3a and 3b around the support shaft 2, respectively.

Further, each carriage 3a,
A pair of stoppers 5a and 5b are rotatably supported between 3b. These stoppers 5a and 5b extend to the vicinity of the head mounting portions of the carriages 3a and 3b, and
When the stopper driving device 6 provided in the magnetic recording medium 1 is driven, it moves between the carriages 3a and 3b and the magnetic recording medium 1 to prevent the heads 4a and 4b from coming into contact with the magnetic recording medium 1. It is regulated.

A vibration detector 7 is mounted inside the magnetic disk device. The detection signal of the vibration detector 7 is input to the control device 8. When the vibration detection signal exceeds a certain value, the control device 8 gives a driving command to the stopper driving device 6 to drive the stoppers 5a and 5b to regulate the shake of the carriages 3a and 3b.

The operation of the magnetic disk device having such a configuration will be described below. First, during normal operation, the stoppers 5a and 5b are on standby outside the movable range of the carriages 3a and 3b, as indicated by the solid line in FIG. Here, when vibration is applied to the magnetic disk device, the vibration detector 7 transmits an electric signal according to the magnitude of the detected vibration to the control device 8 via a signal line. When the control device 8 determines that the detection signal from the vibration detector 7 is above a certain level,
A drive command is given to the stopper drive device 6, and the stopper 5
Drive a and 5b. As a result, the stoppers 5a, 5
b moves to the position shown by the broken line in FIG.

At this time, as shown in FIG. 1B, a stopper 5 is provided between the magnetic recording medium 1 and the carriages 3a and 3b.
a, 5b interrupt and support the carriages 3a, 3b at a distance such that the magnetic recording medium 1 and the heads 4a, 4b do not contact each other. Therefore, the magnetic recording medium 1 and the heads 4a and 4b
Contact is prevented, and head crash can be prevented.

Therefore, the magnetic disk device having the above-described structure has the effect of preventing head crush in advance by the vibration detecting portion for detecting the vibration of the head and the mechanism for preventing the contact between the magnetic recording medium and the head. In addition,
If the control device 8 is provided with a function of detecting that the power supply of the magnetic disk device has been cut off, a drive command is given to the stopper drive device 6 when the power supply is detected, and the stoppers 5a and 5b are operated. It can also handle shocks during use.

[0014]

As is apparent from the above description, according to the present invention, it is possible to provide a magnetic disk device capable of preventing head crash due to impact.

[Brief description of drawings]

1A and 1B show a configuration of a magnetic disk device according to an embodiment of the present invention, in which FIG. 1A is an overall configuration diagram and FIG. 1B is a side view of a structural portion.

[Explanation of symbols]

 1 Magnetic Recording Medium 2 Spindles 3a, 3b Carriage 4a, 4b Heads 5a, 5b Stopper 6 Stopper Drive Device 7 Vibration Detector 8 Control Device

Claims (3)

[Claims] 1. A head for recording and reproducing data on and from a magnetic recording medium, a vibration detecting means for detecting a vibration applied to the head and having a certain width or more, and the head for magnetic recording medium when vibration is detected by this means. A magnetic disk drive, comprising: a head restricting unit that restricts the head from contacting the magnetic disk. 2. The head restricting means is a stopper that enters between a head supporting portion of the carriage and a magnetic recording medium at the same center of rotation as a carriage that supports the head and keeps a gap between the both, and the vibration detecting means. A stopper drive device that drives the stopper so as to enter between the head support portion and the magnetic recording medium in accordance with a detection output from the device, and a vibration detection signal obtained by the vibration detection means when the vibration detection signal reaches a reference level. A magnetic disk device, comprising: a control device that gives a drive command to a stopper drive device. 3. The magnetic disk drive according to claim 2, wherein the control device has a power cutoff detection function and gives a drive command to the stopper driving device when the power cutoff is detected.