JPH11273290A - Hard disk drive device improving recording density and protecting recording medium - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve recording density and to prevent a recording medium surface from being damaged regardless of a stopping time and an operating time by loading a dummy disk parallel to the recording medium and loading a magnetic head having a magnetic head slider provided with a V-shaped wall surface projection opening in the tip direction between the recording medium and the dummy disk. SOLUTION: The magnetic head slider 10 is provided with the V-shaped wall surface projection 11 opening in the tip direction on an upper surface, that is, an opposite side surface of a surface (lower surface) opposite to the recording medium. Further, a gap between the recording medium surface and the magnetic head at the stopping time 15 enlarged. Then, for generating an airflow so that down force is applied to the slider 10, The dummy disk is loaded parallel to the recording medium so as to hold the tip part of the magnetic head between with the recording medium. Thus, the gap between the slider 10 and the recording medium is reduced when the rotation is in a steady state, and is enlarged at the stopping time.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a hard disk drive mounted for recording various data on a recording medium of a computer device or outputting the data.

[0002]

2. Description of the Related Art A hard disk drive records and reproduces signals by a magnetic recording method. When a current is applied to a coil of a magnetic head close to a thin film (magnetic layer) of a magnetic material, the magnetic head is mounted near a gap of the magnetic head to record various data on a recording medium of a computer device or to output the data. I have. An example of a conventional magnetic head in such a hard disk drive is shown in FIG.
As shown in the schematic diagram seen from the back side of
Numeral 1 denotes a magnetic head, and numeral 2 denotes a slider mounted on a suspension 3 at the tip. FIG. 4 is a schematic perspective view of the shape of the slider 2 as viewed from the front side.
The slider 2 has a groove 6 formed by two rail-shaped portions 5 on the lower surface side.
Are formed. FIG. 5 is a schematic view of the magnetic head as viewed from the side of the magnetic head. The slider 2 is configured to contact the magnetic head 1 lightly with the surface of the recording medium 8 by the spring action of the suspension 3. Therefore, when the recording medium stops without rotating, the slider 2
Is in contact with the surface of the recording medium. The operation is started, the recording medium rotates, and an airflow is generated in the direction of the arrow in the figure. This air current mainly passes through the groove 6 shown in FIG. 4, but as the rotational speed of the recording medium increases, the magnetic head slider 2 rises from the recording medium with an increase in buoyancy and is depressed by the elasticity of the magnetic head. It is designed to balance power and strength. Although not shown, there is a magnetic head slider for a contact recording system for improving the recording density.

[0003]

Referring to FIG. 5, the slider 2 of the magnetic head which is in contact with the surface of the recording medium when the recording medium is stopped will be described below.
A buoyancy is generated by the airflow generated on the lower surface of the recording medium, and the buoyancy causes the slider to float up from the surface of the recording medium. It has become. The pressing force is usually as small as about 2.9 × 10 ⁻² N (3 gf). However, when the head and the medium come into contact with a certain beat, such as a sudden power failure, the pressing force is applied to the surface of the recording medium. May be damaged, and the lower the flying height of the slider, the higher the probability. That is, normally, the operation is performed while maintaining an appropriate space between the slider and the recording medium by the buoyancy of the slider and the elasticity of the suspension. However, if the slider comes into contact with the recording medium in any way, the elasticity of the magnetic head may damage the surface of the recording medium due to its elasticity.When the rotation starts or stops, the rotation speed decreases and the airflow decreases. As the buoyancy decreases, the risk of the above-mentioned danger increases.

Further, in a magnetic head slider for a contact recording system, in order to reduce abrasion, a load for pressing a magnetic head against a recording medium is reduced by a factor of 100 to 10 ^-4 N.
At the same time, and at the same time, the mass of the slider is also reduced to one hundredth of the current value in order to follow minute irregularities on the surface of the recording medium.
It is necessary to reduce to about 0.1 mg below. However, this method requires a significant reduction in the size of the slider,
If the mass of the slider is made too small, the slider is greatly vibrated due to the unevenness of the recording medium, and on the contrary, the gap with the recording medium becomes too large.

[0005]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and a dummy disk is mounted in parallel with a recording medium. A hard disk drive device which has a magnetic head having a formed magnetic head slider mounted so as to be located between the recording medium and the dummy disk, and which improves the recording density and protects the recording medium.

[0006] The force for pushing the slider downward by the airflow is called downforce, and it is known that when represented by F, the downforce F is represented by the following equation. F = １ ／ · ρ · C · A · V ^{2 In} this equation, F is downforce, ρ is air density,
C is the lift coefficient, A is the front projected area, and V is the velocity.

Therefore, the shape of the V-shaped wall projection opened in the front end direction is a V-shaped wall shape having a constant wall height as shown in FIG. When the wall shape is set as above, the lift coefficient C increases, so that the downforce F increases. Also, as the rotation speed of the recording medium increases, the velocity V of the air current increases, and accordingly, the downforce increases. Therefore, the gap between the surface of the recording medium and the magnetic head at the time of stop can be increased, and the downforce increases as the rotation speed starts to be in a steady state, and the magnetic head descends to reduce the surface of the recording medium. The normal operation is performed while maintaining the balance with the airflow flowing under the magnetic head. Accordingly, there is no possibility that the magnetic head slider comes into contact with the surface of the recording medium even when the operation is stopped or when the operation is started or when the operation is shifted to the stop state. In this way, the gap between the magnetic head slider and the surface of the recording medium becomes smaller as the rotation speed becomes normal, so that the recording density can be improved by adjusting and installing the magnetic head so that this gap becomes as small as possible. In addition, the surface of the medium is not damaged regardless of the stop operation.

[0008]

1A and 1B are schematic perspective views of an embodiment of a magnetic head slider according to the present invention. A magnetic head slider denoted by reference numeral 10 in the drawing has a V-shaped wall projection 1 which is opened in the direction of the tip thereof.
1 is formed. FIG. 1A shows the case where the taper of the slider mounting portion is large, and FIG. 1B shows the case where the taper of the slider mounting portion is small.

FIG. 2 is a schematic diagram showing a state in which a dummy disk according to the present invention is mounted, and at the same time, explaining the operation of the present invention. In the figure, 12 is a suspension, 10 is a slider provided at the tip of a magnetic head and has the shape shown in FIG. 1, and 13 is a recording medium. Slider 1
A dummy disk 14 is mounted in parallel with the recording medium 13 so that the leading end of the magnetic head is narrowed between the recording medium 13 and the recording medium in order to generate an airflow in which a down force is applied to the recording medium 13. With such a configuration, an airflow indicated by an arrow is generated by rotation of the recording medium. These operations are as described above.

[0010]

According to the present invention, in a hard disk drive of a computer recording apparatus, recording is performed by forming a magnetic head slider as in the present invention and providing a dummy disk (the top slider is installed so as to obtain a down force). When the rotation of the medium is stopped or when the rotation speed at which the rotation is started or stopped is slow, the slider does not contact the surface of the recording medium, so there is no danger of damaging the medium, and when the rotation is in a normal state. The magnetic head is stabilized by the balance between the downforce to the slider and the buoyancy due to the airflow on the lower surface of the slider, and the recording density can be improved by minimizing the gap between the slider and the recording medium during normal operation. . Even if the gap is made as small as possible, there is no possibility of damaging the surface of the recording medium as described above because the gap is large at the time of stopping.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view of an embodiment of a magnetic head slider according to the present invention.

FIG. 2 is a schematic diagram for explaining a state in which a magnetic head slider and a dummy disk according to the present invention are mounted and an operation thereof.

FIG. 3 is a schematic perspective view of a conventional magnetic head viewed from the back side.

FIG. 4 is a schematic perspective view of a conventional magnetic head slider.

FIG. 5 is a schematic diagram showing a relationship between a conventional magnetic head slider and a recording medium and explaining its operation.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Magnetic head 2 Slider 3 Suspension 5 Rail-like part 6 Groove 8 Recording medium 10 Magnetic head slider 11 V-shaped wall projection 12 Suspension 13 Recording medium 14 Dummy disk

Claims (1)

[Claims] 1. A hard disk drive for a computer recording apparatus, comprising: a magnetic head having a magnetic head slider in which a dummy disk is mounted in parallel with a recording medium and a V-shaped wall projection that is opened in a front end direction is formed. A hard disk drive device which is mounted so as to be located between a medium and a dummy disk, and which improves recording density and protects the recording medium.