JPH0212676A - Magnetic disk device - Google Patents

Abstract

PURPOSE:To attain high density recording with high reliability without any contact between a magnetic disk and a magnetic head in any state of the magnetic disk in stop, low speed drive and high speed drive by applying loading and unloading of the magnetic head through the use of a repulsing force of magnets. CONSTITUTION:Small sized magnets 2, 2' are fixed to magnetic head supports 1, 1', and magnetic heads 6, 6' are located on the outer circumference of the magnetic disk 7, then the magnetic heads 6, 6' are floated from the magnetic disk 7 by a repulsion force caused by the magnets 5 in which same poles are opposed at the outside of the magnetic head supports 1, 1'. Thus, when the magnetic disk 7 is started or stopped, that is, the disk speed is in such a degree that the magnetic heads 6, 6' are not floated or the magnetic disk device is in pause, the magnetic heads 6, 6' are floated from the surface of the magnetic disk 7 surely by locating the magnetic heads 6, 6' to the outer circumference of the magnetic disk 7. Thus, the magnetic head is not in contact with the magnetic disk in any state and the device with high reliability and high density recording is realized.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a magnetic disk device in which a magnetic head floats from the surface of a magnetic disk due to aerodynamic action due to relative motion with the magnetic disk to perform magnetic recording and reproduction. In particular, the present invention relates to a magnetic disk device with an improved loading and unloading mechanism for a magnetic head.

[Conventional technology]

In recent years, with the demand for higher recording densities and higher reliability in magnetic disk devices, the floating type magnetic heads used in these devices are placed in contact with the surface of the magnetic disk, and as the magnetic disk rotates. When the magnetic disk starts to reach a certain speed, the magnetic head flies and magnetic recording and reproducing are performed while maintaining a certain interval. and,
When the magnetic disk is stopped, the magnetic head starts to come into contact with the magnetic disk when the speed of the magnetic disk falls below a certain level, and when the speed decreases further and the magnetic head stops, the head comes into full contact.

[Problem to be solved by the invention]

In such a magnetic disk device, the magnetic head and magnetic disk are in a sliding state each time they are started and stopped, and the magnetic disk may be damaged by the magnetic head (hehehehehehe), which is a problem in terms of reliability. has become a very big problem. Further, when the rotation of the magnetic disk is stopped, the magnetic disk and the magnetic ridge may come into close contact with each other due to the influence of moisture or the like.

To prevent this phenomenon, grooves called texturing are generally formed on the surface of the magnetic disk. However, by texturing p1
There is a problem in that spacing occurs between the magnetic head and the surface of the magnetic disk, completely hindering high-density recording.

The above applies to a positive pressure type slider air outlet head, but the same applies to a negative pressure type slider magnetic head. In the case of a negative pressure slider magnetic head, compared to a positive pressure slider magnetic head, the relative slide between the head and the magnetic disk is smaller, so the time for the head and the magnetic disk to slide is shorter. Frictional wear is reduced. However, if the magnetic head remains stationary on the magnetic disk for a long time, the adhesion phenomenon occurs, similar to the case with positive pressure slider magnetic heads, and texturing of the magnetic disk is essential to avoid the above-mentioned problems. is unavoidable.

To solve this problem, a method of loading and unloading the magnetic head using a flexible method such as a V-bar has been proposed (Reference: NHK Giken Monthly Report, No. 11, 1982, 412-418. page). however,
In the mechanical method, a new problem arises in that mechanical vibration of the magnetic head occurs during loading of the magnetic head, thereby damaging the magnetic disk and causing IP loss. Furthermore, loading and unloading are mechanical elements and 71! Since this is done by combining it with a magnet or a motor, it is difficult to miniaturize the device, and the number of parts increases, making the magnetic disk device complicated. Also,
The distance between the magnetic disk and magnetic head is usually 0.1 to 0.6 μm.
The cleanliness of the operating environment is important, but if there are mechanical moving parts,
Dust is generated from that part, and the dust may enter between the magnetic head and the magnetic disk, causing damage to the magnetic disk (-, bulge crash), making it impossible to obtain sufficient reliability. There were many problems.

The present invention solves the above-mentioned problems and prevents contact between the magnetic disk and the magnetic head even when the magnetic disk is stopped, rotating at low speed, or rotating at high speed, thereby achieving high reliability and high density. It is an object of the present invention to provide a magnetic disk device capable of recording. [Means for solving all the problems] The present inventor has studied loading and unloading of a floating magnetic head, and has developed Loading and unloading of the magnetic head can be carried out easily and reliably by throwing a small magnet and placing another magnet outside the support in such a position that a mutually repulsive force is generated. In other words, the present invention is a magnetic disk drive in which the magnetic head levitates above the surface force 1 of the magnetic disk due to the aerodynamic action caused by relative movement with the magnetic disk and performs all magnetic recording and reproduction. When the rotational speed of the P1 disk does not reach the speed at which the magnetic brim floats, a magnet other than the magnet is installed close to the position where the magnet stops when the magnetic head is at rest. , a magnetic disk device in which the magnetic head is placed in a rest position and the magnetic head is made to float above the surface of the magnetic disk by the repulsive force of both the magnets.

Hereinafter, the present invention will be explained with reference to the drawings. A magnet 2.2't- is fixed to the magnetic head support 1, 1'. On the other hand, if necessary, a magnet 5 is installed on a non-movable part of the magnetic disk device, such as a base plate V-1-3, by attaching a magnet support 4.

The two magnets are arranged so that their opposing surfaces have the same polarity and generate a repulsive force. The magnet used at this time is preferably a magnet made of samarium cobalt or the like, and it is necessary to have a magnetic force that separates the magnetic head 6, 6' from the magnetic disk 7 to the extent that it does not come into contact with it.

To explain a specific example of the operation, first, the magnetic disk drive motor 8 starts rotating. The rotational speed of the p magnetic disk is detected by the rotational speed detection means 9.

The rotational speed detection means may be any method using centrifugal force, a magnetic encoder, an optical encoder, or the like. When the rotational speed reaches a speed at which the magnetic head flies above the surface of the magnetic disk due to aerodynamic action, the head carriage 10 is operated to move the magnetic head into an area where magnetic recording and reproduction are to be performed. This makes it possible to load and dub the magnetic disk without having to make contact with the magnetic disk. When stopping the rotation of the magnetic disk, the magnetic disk carriage is operated so that the magnet 2.2' fixed to the magnetic head support and the magnet 5 installed in the non-movable part of the disk drive face each other. The magnetic head is moved to a position where it floats above the surface of the magnetic disk, and then the power to the magnetic disk drive motor is turned off to rotate the magnetic disk. The above operation is the same for both the magnetic head using a positive pressure slider and the magnetic head using a negative pressure slider.

[Effect]

In the magnetic disk device of the present invention, a small magnet is fixed to the magnetic head support, and when the magnetic head is located on the outer circumference of the magnetic disk, the same pole provided outside the magnetic spatula P support is connected to the opposing magnet L. The magnetic head levitates from the magnetic disk due to the repulsive force VC generated by the magnetic head.

Therefore, when the magnetic disk is started or stopped, that is, when the magnetic disk rotation speed is such that the magnetic head does not fly,
When the case or magnetic disk device is stopped, the magnetic head'! 1
-ffi If the magnetic head is positioned on the outer periphery of the disk, the magnetic head will surely fly above the surface of the magnetic disk. Therefore, the magnetic head never comes into contact with the magnetic disk at any time.

〔Effect of the invention〕

According to the magnetic disk device of the present invention, since the loading and unroofing of the magnetic head are performed using the repulsive force of the magnet, the following effects can be obtained, and the magnetic disk device is capable of highly reliable and high-density recording. fr, it can be realized.

(1) Since the magnetic head does not come into contact with the magnetic disk when the magnetic disk is started or stopped, the magnetic disk is not damaged and the device can operate stably for a long period of time.

(2) Even when the magnetic disk drive is at rest, the magnetic head does not come into contact with the magnetic disk, so the magnetic head does not form a layer on the surface of the magnetic disk. Therefore, texturing of the magnetic disk is not necessary. , there is no need to form irregularities on the surface of the magnetic disk, and the effective spacing can be reduced, making high-density magnetic recording and reproducing possible. (3) Loading and unloading of the magnetic head is extremely easy. This can be realized with fewer parts.

[Brief explanation of the drawing]

FIG. 1 is a side view of the magnetic disk of the present invention, and FIG. 2 is a perspective view of the magnetic disk of the present invention. Code 1.1'...Magnetic head support, 2.2'...
・Magnet, 3... Base plate, 4... Magnet support, 5... Magnet, 6.6 Mouse magnetic head 7...
Magnetic disk, 8...Magnetic r isf drive motor 9...Rotational speed detection means, 10...Herad carriage

Claims (1)

[Claims] In a magnetic disk device in which a magnetic head levitates above the surface of a magnetic disk due to aerodynamic action due to relative motion with the magnetic disk and performs magnetic recording and reproduction, a magnet is fixed to a magnetic head support, and when the magnetic head is at rest, the magnet is By installing a magnet different from the above-mentioned magnet in close proximity to the stopping position, when the rotational speed of the disk does not reach the speed at which the magnetic head flies, the magnetic head is placed in the resting position and both of the above-mentioned magnets A magnetic disk device that makes it possible to levitate a magnetic head from the surface of the magnetic disk by the repulsive force of the magnetic disk.