JPS61258327A - floating magnetic head - Google Patents

Abstract

PURPOSE:To shorten the time needed to secure a steady state without changing the floating degree by increasing the width of the trailing side and decreasing the width of the leading side of a flat part. CONSTITUTION:A sloping surface part 2 is formed adjacent to a flat part 1. The width 3 of the leading side of the part 1 is increased with the width 4 of the trailing side decreased respectively. When a magnetic disk is revolved, the leading side floats up first even at a low revolving speed with large motive power since the width of the part 1 is increased at the leading side. When the revolving speed is increased more, the floating dynamic pressure is controlled by the dynamic pressure received by the part 1 at the trailing side. Then a steady state is secured with a prescribed floating degree since the width of the part 1 is decreased at the trailing side. This can shorten the time needed to secure a steady floating state.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a floating magnetic head structure for a fixed magnetic i-isk mounting case.

[Summary of the invention]

The present invention provides a floating magnetic head for a fixed magnetic disk device, in which the shape of a flat portion that generates dynamic pressure by an air flow for floating the magnetic head is adjusted so that the shape of the flat portion is adjusted relative to the rotational direction of the magnetic disk. By monotonically decreasing the width, the flying characteristics of the floating magnetic head are controlled when the magnetic disk stops and reaches steady rotation, thereby increasing the durability of the magnetic disk and the floating magnetic head.

[Conventional technology]

Magnetic disk drives, along with magnetic tape drives, are widely used as external storage devices for today's computer systems. Magnetic disk drives are becoming increasingly popular due to their faster data transfer speeds compared to magnetic tape drives and the ability to perform random access to quickly retrieve desired information, leading to higher density, larger capacity, faster speeds, and lower prices. , miniaturization is progressing more and more. The medium used in a magnetic disk device is an aluminum substrate coated with a recording medium, and is called a hard disk for each so-called flexible disk or floppy disk. In the following, this hard disk will be referred to as a hard disk. There are also fixed-head heads that are compatible with magnetic disks and have a dedicated head for each track on the magnetic disk surface, but here, the magnetic head seeks (searches) on the magnetic disk surface and searches for any track The moving head that performs all reading and writing is an all-magnetic head.

As mentioned above, magnetic disk drives have very excellent features such as high data transfer speeds and random access, but they cannot match magnetic tape drives in terms of large capacity. Therefore, high-density recording is very important for magnetic disk devices. The recording density of a magnetic recording device is determined by the bit density (BP), which indicates the number of bits per unit length in the circumferential direction of the magnetic disk, and the track density (TP), which indicates the number of tracks per unit length in the radial direction of the magnetic disk. It is represented by In order to improve the recording density, it is necessary to increase the aforementioned BPI and TP'■, and it is necessary to narrow the magnetic gap (gap section) (7) in the magnetic head and narrow the track width, respectively. . In addition, the magnetic head is a floating magnetic head that makes full use of the principles of dynamic fluid bearings to prevent wear caused by contact with the high-speed rotating magnetic disk. Using this, it floats away from the magnetic disk plate while maintaining a minute distance Pjl. Therefore, in order to improve the bit density, it is necessary to not only narrow the gap portion but also to narrow the floating distance M'. However, there is a limit to the flying clearance in order to avoid the risk of contact accidents (head crashes) due to minute protrusions and dust on the magnetic disk. Therefore, efforts were made to improve the internal cleanliness of the magnetic disk drive, improve the magnetic disk, and reform the magnetic head pressure structure. Floating contact start/stop method (Cs s
= contact 5tart 5top Banshiki) is adopted.

In the structure of a conventional floating magnetic head, as shown in FIG. 2, a flat part 1 for generating a flying force has a uniform width 2 in the direction of rotation of the magnetic medium.

[Problems and objects to be solved by the invention] However, in the above-mentioned prior art, friction between the magnetic disk and the magnetic head that occurs in a transient situation until the flying height of the floating magnetic head reaches a steady state, and minute There is a problem that the durability of both materials decreases due to S-temperature. SUMMARY OF THE INVENTION The present invention is intended to solve these problems, and its purpose is to provide a floating magnetic head that can reach a steady floating state in the shortest possible time, and to provide a magnetic disk and a floating magnetic head. The goal is to increase the durability of

[Means to solve all problems]

In the floating magnetic head of the present invention, a flat part for generating all the dynamic pressure by airflow on the surface of a magnetic disk has two sloped parts that touch each other at ridge lines on both sides in the width direction of the flat part. and the width of the flat portion is monotonically decreased in the rotational direction of the magnetic disk relative to the length.

[Effect]

According to the above configuration of the present invention, since the width of the flat part σ) on the trailing side is wide, the dynamic pressure generated at the start of levitation? Since the leading side of the flat part has a narrow width, it is possible to appropriately set the dynamic pressure generated in a steady state, and as a result, the floating height remains unchanged, and the time to reach a steady state is reduced. It becomes possible to do this.

〔Example〕

FIG. 1 is a perspective view of a floating magnetic head according to an embodiment of the present invention, in which a sloped portion 2 is formed in contact with a flat portion 1. As shown in FIG. Here, the leading side II@5 of the flat section 1 is wider, and the trailing side 4 is narrower. A method for forming such a flat part is to grind and wrap the part of the triangular prism formed by the oblique [i It can be easily manifested. In addition, on the trailing side of the Heitan@1, there is a magnetic rad core 5 for recording and reproduction, and
A coil 6 for recording raw signals is formed.

When such a floating magnetic head is held on a magnetic disk with an appropriate load and the magnetic disk is rotated, the leading side starts to float first. At this time,
Since the width of the flat part on the leading side is widened, it receives large dynamic pressure and begins to float even at low rotational speeds. As the rotational speed further increases, the dynamic pressure for floating comes to be dominated by the dynamic pressure received by the trailing side flat part. At this time, the flat part 1112 on the trailing side? Since the comb is narrow, a steady state is reached at a predetermined flying height. Therefore, it is possible to provide a floating magnetic head that requires a short time to reach a steady floating state.

〔Effect of the invention〕

As described above, according to the present invention, a floating magnetic head that can secure a predetermined flying height t1f'' even if the friction time with the magnetic disk is short can be manufactured, and friction and minute collisions between the magnetic disk and the magnetic head can be avoided. This has the effect of significantly reducing wear and damage caused by the process and increasing durability.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a floating magnetic head according to an embodiment of the present invention. FIG. 2 is a #F view of a conventional floating magnetic head. 1...Flat part 2...Slope part 3...Leading side width 4...Trailing side width 5...For recording and reproduction Magnetic Radcore 6...
- Coil for recording and reproducing signals. that's all

Claims (1)

[Claims] In floating magnetic heads for fixed magnetic disk drives,
A flat part for generating dynamic pressure by air flow on the surface of a magnetic disk has two sloped parts that touch at ridge lines on both sides in the width direction of the flat part, and the width of the flat part is defined as the length. A floating magnetic head characterized by a monotonically decreasing direction in the direction of rotation of a magnetic disk.