KR19990061740A - Magnetic head for hard disk drive - Google Patents

Abstract

Disclosed is a magnetic head for a hard disk drive. The disclosed magnetic head includes an air bearing surface in which air pressure is applied to a space facing the hard disk during rotation of the hard disk, a pair of magnetic poles exposed to the air bearing surface, and drawn into the air bearing surface. In the magnetic head for a hard disk drive having a head gap in which a magnetic field is formed by a pair of magnetic poles, and in which information is recorded / reproduced on the hard disk while flying in a state of being raised from the hard disk at a predetermined height, the pair of magnetic poles And a foreign matter receiving groove enclosing the head gap to be drawn in with respect to the air bearing surface, so that the foreign substance flowing around the magnetic head is accommodated in the foreign substance receiving groove so that the head gap is protected from foreign substances. Can improve the performance.

Description

Magnetic head for hard disk drive

The present invention relates to a hard disk drive mainly used as a secondary storage device of a computer, and more particularly, to a magnetic head of a hard disk drive for keeping the magnetic head clean.

In general, a hard disk drive (HDD: Hard Disk Driver) capable of recording / reproducing information by a user is mainly used as an auxiliary storage device of a personal computer. 1, a spindle motor (not shown) is installed in the base frame 10, and a plurality of hard disks 11 are rotatably mounted to the spindle motor. In order to fly the magnetic head 50 onto the hard disk 11, the actuator 20 rotates about the pivot shaft 21. In addition, a cover frame (not shown) is installed on the base frame 10 to protect the hard disk 11 and the actuator 20 and block foreign material from entering. On the other hand, the circuit driver 30 is installed on the base frame 10 to control the signal transmission between the main circuit board and the magnetic head interfaced with the machine body of the computer and the driving of the actuator 20.

The actuator 20 includes a swing arm 23 pivoted about the pivot shaft 21 by the voice coil motor 22 and a suspension 25 supporting the magnetic head 50 at the distal end thereof. The suspension 25 is provided in plurality up and down to support the magnetic head so as to correspond to both surfaces of the plurality of hard disks.

The magnetic head 50 is in a stationary state in contact with the hard disk 11 at the initial stage of the hard disk driver driving, and then floats to a constant height as the rotation speed of the hard disk 11 increases, thereby stabilizing while searching for a desired sector. In this case, data recording / reproducing operation is performed.

As shown in Figs. 2 and 3, the magnetic head 50 is a pair of air bearing surface 51 and the air bearing surface 51 exposed to the air pressure acting between the disk and the air bearing surface 51 during rotation of the hard disk. A head having a magnetic pole 52 and a predetermined depth D introduced between the magnetic pole 52 with respect to the air bearing surface 51 and having a magnetic field formed by a pair of magnetic poles 51 around the magnetic pole 52. Gap HG.

However, the conventional magnetic head 50 has a problem in that the performance of the magnetic head 50 is deteriorated due to accumulation of contaminants such as dust around the magnetic head 50 during operation.

The present invention has been made to solve the above problems, and an object thereof is to improve the performance of a magnetic head by preventing foreign matters around the magnetic head from accumulating in the head gap.

1 is a perspective view schematically showing a hard disk drive.

2 is a schematic perspective view of a magnetic head for a conventional hard disk drive.

3 is a schematic cross-sectional view of the headgap portion shown in FIG.

4 is a schematic perspective view of a magnetic head for a hard disk drive according to the present invention.

5 is a schematic cross-sectional view of the headgap portion shown in FIG. 4.

Explanation of symbols for main parts of the drawings

110. Air bearing surface 120. Magnetic head

130. Foreign material receiving groove 122. Core

124 coil

In order to achieve the above object, the magnetic head for a hard disk drive according to the present invention includes an air bearing surface in which air pressure is applied to a space facing the hard disk when the hard disk rotates, and as long as the air head is exposed to the air bearing surface. A pair of magnetic poles, a head gap drawn into the air bearing surface and a magnetic field formed by the pair of magnetic poles are formed, and information is recorded / reproduced on the hard disk while flying in a state of being injured from the hard disk by a certain height. In the magnetic head for a hard disk drive, a foreign material receiving groove surrounding the pair of magnetic poles and the head gap is formed to be introduced to the air bearing surface, the foreign matter flowing around the magnetic head is accommodated in the foreign material receiving groove. As a result, the head gap is protected from foreign matters.

Hereinafter, exemplary embodiments of a magnetic head for a hard disk drive according to the present invention will be described in detail with reference to the accompanying drawings.

4 and 5 are schematic perspective views and cross-sectional views of a head gap portion of a magnetic head for a hard disk drive according to the present invention.

Referring to the drawings, the magnetic head 100 for a hard disk drive according to the present invention includes a pair of magnetic poles 120, an air bearing surface 110, a head gap HG, and a foreign substance accommodating groove 130. Include.

The pair of magnetic poles 120 are located at both ends of the core 122. The coil 124 is wound around the core 122 while the head gap HG is formed between the magnetic poles 120. When flowing, a strong leakage magnetic flux is formed around the head gap HG by the pair of magnetic poles 120.

Here, the leakage magnetic flux changes the magnetic particles of the hard disk in a certain direction according to the direction of the current, which is called writing. In contrast, a process in which a magnetically recorded signal is induced as an electrical signal is called reading. The above characteristics are the basic principles of the magnetic head and are variously modified according to the recording method and the characteristics of the material. The above recording method is mainly a horizontal recording method, which is a general trend as a hard disk drive of a type of recording / reproducing while rising to a constant height under the rotation of the hard disk.

The air bearing surface 110 is in contact with the hard disk 11 by the elastic force of the suspension when the hard disk 11 is not rotated, and the air bearing surface 110 is in contact with the magnetic head due to the hardness difference between the magnetic head and the constituent materials of the hard disk. When the hard disk is rotated to prevent resistance heat and abrasion caused by the resistance is a portion floating on the hard disk 11 surface by the air pressure.

The foreign substance accommodating groove 130, which is a feature of the present invention, is formed by introducing a predetermined depth D with respect to the air bearing surface 110 to surround the pair of magnetic poles 120 and the head gap HG. Therefore, the foreign matter flowing around the magnetic head is accommodated in the foreign matter receiving groove 130, so that the head gap (HG) can be protected from the foreign matter.

Referring to the operation of the magnetic head 100 for a hard disk drive according to the present invention by the above configuration is as follows.

In the initial stage of hard disk driver driving, the magnetic head 100 is in a stopped state, and the air bearing surface 110 is in contact with the hard disk 11. On the other hand, as the rotational speed of the hard disk is increased, it rises to a certain height, while flying in a stabilized state while searching for a desired sector to perform recording / reproducing operation of information. That is, since the magnetic head 100 is in contact with the hard disk 11 at the beginning of the injury, the sliding by the sliding is possible only when a certain friction force is overcome. At this time, the foreign matter such as dust flowing around the magnetic head 100 by the rotation of the hard disk is sucked into the foreign matter accommodating groove 130 to prevent the foreign matter from entering the head gap (HG).

As described above, the magnetic head for a hard disk drive according to the present invention receives foreign substances such as dust around the magnetic head into the foreign substance receiving groove to prevent the foreign substances from entering the head gap of the magnetic head and degrading the performance of the magnetic head. Can be.

Claims (1)

When the hard disk is rotated, an air bearing surface with air pressure acting on the space facing the hard disk, a pair of magnetic poles exposed to the air bearing surface, and a pair of magnetic poles introduced into the air bearing surface, In the magnetic head for a hard disk drive having a head gap in which a magnetic field is formed, which records / reproduces information on the hard disk while flying in a state of being raised from the hard disk at a predetermined height. The foreign matter receiving groove surrounding the pair of magnetic poles and the head gap is formed to be introduced into the air bearing surface, so that the foreign matter flowing around the magnetic head is accommodated in the foreign substance receiving groove so that the head gap is protected from the foreign matter. Magnetic head for hard disk drive characterized in that.