JP2707893B2 - Magnetic disk drive - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic disk drive. 2. Description of the Related Art Conventionally, a magnetic disk drive uses a dynamic pressure generated by running of a magnetic recording medium to float with a small air bearing provided between the magnetic recording medium and the magnetic recording medium. A head is used. Such a floating magnetic head is disclosed in, for example, Japanese Patent Publication No. 58-21329.
No., Japanese Patent Publication No. 58-28650, etc.
The basic structure is such that a read / write element is attached to an air outflow end side of a slider having a floating surface on a surface side facing a magnetic recording medium. FIG. 11 is a perspective view of a conventional magnetic head of this type, wherein 1 is a slider made of, for example, a ceramic structure, and 2 is a read / write element. The slider 1 has two rail portions 101 and 102 formed at an interval on a surface facing a magnetic recording medium, and the surfaces of the rail portions 101 and 102 are provided with a highly flat air bearing surface 103, 1.
04. On the side of the air bearing surfaces 103 and 104, a tapered portion 103a,
104a is provided. The read / write element 2 is a thin-film magnetic head element formed according to a process similar to the IC manufacturing technology, and includes a tapered portion 103a,
It is attached to the air outflow end side opposite to 104a. When used as a magnetic disk drive,
The magnetic head is mounted on the tip of a gimbal support device (not shown), and the flying surfaces 103 and 104 of the slider 1 are brought into spring contact with the surface of the magnetic disk. start. It is driven by a stop method. When the magnetic disk is stationary,
Although the floating surfaces 103 and 104 are pressed against the surface of the magnetic disk by the spring pressure, when the magnetic disk rotates, as shown in FIG.
Lifting dynamic pressure is generated on the air bearing surfaces 103 and 104 including the floating surface 04a, and a floating amount g that balances this dynamic pressure with the gimbal spring pressure P.
Surface. In the conventional magnetic head, the outer dimensions of the slider 1 are, for example, that the thickness d from the air bearing surfaces 103 and 104 to the opposite facing surface 105 is 0.85 mm, the length L in the air outflow direction is 4 mm, The width w in the direction orthogonal to the outflow direction is selected to be about 3.2 mm, whereby stable flying characteristics are obtained in a region where the flying height is 0.3 μm or more. As described above, a conventional magnetic head having dimensions of a thickness d = 0.85 mm, a length L = 4 mm, and a width w = 3.2 mm has a flying height of 0.3 mm. 3μ
In the region of m or more, stable flying characteristics can be obtained. However, the conventional magnetic head having the above-mentioned dimensions has a large flying height of 0.3 μm or more for obtaining a stable flying characteristic, so that the spacing loss becomes large and it is not possible to cope with a high density of magnetic recording. . In the above-described conventional magnetic disk drive using a magnetic head, the flying height is reduced, for example, by reducing the spacing loss and increasing the density of magnetic recording.
It was found that, when trying to reduce the height to 0.1 μm or less, which is 1/3 or less of the conventional height, the flight attitude collapsed and stable flying characteristics could not be obtained. SUMMARY OF THE INVENTION An object of the present invention is to provide a magnetic disk drive capable of reducing a spacing loss and responding to a higher density of magnetic recording. Another object of the present invention is to provide a magnetic disk drive which can stably maintain a flight attitude (flying attitude) of a magnetic head. Still another object of the present invention is to provide a magnetic disk drive having excellent durability. [0011] In order to solve the above-mentioned problems, a magnetic disk drive according to the present invention includes a magnetic disk and a magnetic head. Using the dynamic pressure generated between the magnetic disk and the magnetic disk, the magnetic head is floated while maintaining a floating amount between the magnetic head and the magnetic disk. The flying height is
It is 0.1 μm or less. The magnetic head has a read / write element attached to an air outflow end side of a slider having a flying surface on a surface side facing the magnetic disk, and the slider has a thickness from the flying surface to the facing surface of zero. .6
5 mm or less, the length in the air outflow direction is 1 mm to 3 mm, and the width in the direction perpendicular to the air outflow direction is 1 mm to 2.5 mm
It is. The present invention utilizes a dynamic pressure generated between a magnetic head and a magnetic disk by running the magnetic disk to cause the magnetic head to float while maintaining a floating amount between the magnetic head and the magnetic disk. The flying height of the disk device is 0.1 μm
From the following, the flying height is significantly smaller than that of the conventional magnetic disk device, the spacing loss is reduced, and it is possible to cope with a higher density of magnetic recording. The magnetic head used in the magnetic disk drive according to the present invention has a thickness from the floating surface to the opposing surface of 0.65 mm or less, and a length in the air outflow direction of 1 mm to 3 mm.
mm, and the width in the direction perpendicular to the air outflow direction is 1 mm to
2.5 mm. It has been found that the use of a magnetic head having such a dimension stabilizes the flying attitude even when the flying height is set to 0.1 μm or less. Since the stabilization of the flying posture contributes to a reduction in spacing loss, a magnetic disk device more suitable for high-density recording can be obtained. In addition, even when the flying height is set to 0.1 μm or less, the flying posture is stable. Therefore, even when the flying height is 0.1 μm or less, which is likely to cause a crash, the crash hardly occurs, and a highly durable magnetic disk is used. It turns out that the device can be realized. The thickness d from the air bearing surface to the opposing surface is equal to 0.
If it exceeds 65 mm, the position of the center of gravity shifts to the side of the opposing surface which is the connection surface with the gimbal, and the floating stability deteriorates. On the other hand, if the length L and the width w are smaller than 1 mm, it is not possible to secure a sufficient floating surface area to secure stable floating characteristics, and the floating stability deteriorates. FIG. 1 is a perspective view of a magnetic head used in a magnetic disk drive according to the present invention. FIG. 2 is a front view of a slider.
FIG. 3 is a bottom view as viewed from the air bearing surface side, and FIG. 4 is a side view. In the figure, the same reference numerals as those in FIG. 11 indicate identical components. The slider 1 has a flying surface 10
The thickness d from 3, 104 to the opposite facing surface 105 is 0.65 mm or less, the length L of the air outflow direction (running direction) a is 1 mm to 3 mm, and the width w in the direction orthogonal to the air outflow direction a. Is set to 1 mm to 2.5 mm. Since the thickness of the attached portion of the read / write element 2 is substantially negligible compared to the length L, the length L is substantially a dimension including the read / write element 2. In the embodiments shown in FIGS. 1 to 4, the flying surfaces 103 and 104 of the slider 1 are flat without a taper surface for generating lift. The ends (a) and (b) of the air bearing surfaces 103 and 104 viewed in the air outflow direction a are contact. It is desirable that the magnetic disk be formed in an arc shape in order to prevent the magnetic disk from catching at the start. The other ends (c) and (d) can also be formed in an arc shape. Although not shown in the drawing, one is located at a substantially intermediate portion in the width direction.
It is also possible to provide a structure in which a rail portion is provided and the surface of the rail portion is used as a floating surface. In the case of this structure, it is convenient to reduce the overall size. Further, when the length and width of the slider are 1 mm or more and 1.5 mm or less, the entire surface facing the disk may be used as the floating surface. FIG. 5 is a perspective view of another embodiment of the magnetic head used in the magnetic disk drive according to the present invention. In this embodiment, the flying surface 106 of the slider 1 is formed in a flat shape without a rail portion, and its edge (a) to
(D) is formed in an arc shape. According to the above magnetic head, it has been found that a magnetic disk device which can obtain stable flying characteristics with low flying height of 0.1 μm or less and high durability can be realized. Next, a specific embodiment will be described. In the structure shown in the embodiment of FIGS. 1 to 4, the outer dimensions of the slider 1 are set as follows: thickness d = 0.65 mm length L = 2.8 mm width w = 2.3 mm width w1 = 0. 3 mm. FIG. 6 is a view showing a magnetic disk device incorporating the above-described magnetic head. M is a magnetic disk, 3 is a head support device, and 4 is a positioning mechanism. The magnetic disk M is driven to rotate in the direction of arrow a by a rotation drive mechanism (not shown). The head support device 3 is driven and positioned in the direction of the arrow b1 or b2 on the rotational diameter O1 by the positioning mechanism 4 so that the magnetic recording is performed between the magnetic disk M and the magnetic head at a predetermined track.
Reproduction is performed. In the head support device 3, one end of a support 32 made of an elastic metal thin plate is attached and fixed to rigid arms 31 attached to the positioning mechanism 4 by means of couplings 311 and 312, and the longitudinal direction of the support 32 is A flexible body 33 also made of a thin metal plate is attached to a free end at one end of
A magnetic head 34 according to the present invention is provided on the lower surface of the flexible body 33.
Is attached. The support 32 has a portion attached to the rigid arm portion 31 as an elastic spring portion 321. The rigid beam portion 3 is connected to the elastic spring portion 321.
22 is formed. The rigid beam portion 322 has flanges 322a and 322b formed on both sides by bending so as to obtain a load force for pressing the magnetic head 34 against the magnetic disk M. In the embodiment, the length, plate thickness, spring property and the like of the rigid arm 31, the support 32 and the flexible body 33 are determined so that the load from the magnetic head 34 to the magnetic disk M is 9.5 g. FIG. 7 is a front view of a main portion of the head support device, and FIG. 8 is a bottom view of the same, viewed from the floating surface side. The flexible body 33 includes two outer flexible frames 331 and 332 extending substantially in parallel with the longitudinal axis O2 of the support 32, and the support 3
Outer flexible frame portions 331, 332
And a central tongue-shaped portion 334 extending from a substantially central portion of the horizontal frame 333 so as to be substantially parallel to the outer flexible frame portions 331 and 332 and having a free end at the tip. One end opposite to the direction in which the horizontal frame 333 is provided is attached to the vicinity of the free end of the support 32 by means such as welding (e). On the upper surface of the central tongue portion 334 of the flexible body 33, for example, a load projection 335 such as a hemisphere is provided. The load is transmitted to the portion 334.
The magnetic head 3 according to the present invention is provided on the lower surface of the central tongue 334.
4 is fixed by means such as bonding. In the configuration shown in FIG. 6, when the magnetic disk M was levitated at a portion where the peripheral speed became 9 m / s,
A flying height of μm was obtained. FIG. 9 is a diagram showing the flying characteristic measurement data of the magnetic disk drive shown in FIGS. The measurement data of FIG. 9 is obtained by a measurement system as shown in FIG. In FIG. 10, 5 is an acoustic. Emission. A sensor (hereinafter referred to as an AE sensor), 6 is a filter, 7 is an amplifier, and 8 is an oscilloscope. The measurement conditions in FIG. 10 are as follows. [0029] As shown in the measurement data of FIG. 9, in the magnetic disk drive using the flying magnetic head 34 according to the present invention, the output of the AE sensor hardly occurs. Thus, according to the magnetic disk drive of the present invention, even when the flying height of the magnetic head is a low value of 0.09 μm, the flight attitude of the magnetic head does not collapse, and stable flying characteristics can be obtained. I understand. As described above, according to the present invention, the following effects can be obtained. (A) It is possible to provide a magnetic disk drive that can reduce spacing loss and cope with high density of magnetic recording. (B) It is possible to provide a magnetic disk drive that can stably maintain the flight attitude (flying attitude) of the magnetic head. (C) A magnetic disk device having excellent durability can be provided.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a magnetic head used in a magnetic disk drive according to the present invention. FIG. 2 is a front view of the magnetic head shown in FIG. FIG. 3 is a bottom view of the magnetic head shown in FIG. 1 as viewed from the air bearing surface side. FIG. 4 is a side view of the magnetic head shown in FIG. 1; FIG. 5 is a perspective view of another embodiment of the magnetic head used in the magnetic disk drive according to the present invention. FIG. 6 is a diagram showing a magnetic disk drive according to the present invention. FIG. 7 is a front view of a main part of a head support device used in the magnetic disk drive of FIG. 6; FIG. 8 is a bottom view of the head support device shown in FIG. 7 as viewed from the floating surface side. FIG. 9 is a diagram showing flying stability measurement data of the magnetic disk drive according to the present invention. FIG. 10 is a diagram showing a measurement system for obtaining the measurement data of FIG. 9; FIG. 11 is a perspective view of a conventional magnetic head. FIG. 12 is a diagram showing an operation state of a floating magnetic head. [Description of Signs] 1 slider 2 read / write element 103, 104, 106 flying surface d thickness from the flying surface to the facing surface L length in the air outflow direction w width in the direction perpendicular to the air outflow direction

   ────────────────────────────────────────────────── ─── Continuation of front page    (72) Inventor Mikio Matsuzaki               1-13-1 Nihonbashi, Chuo-ku, Tokyo               IDK Corporation                (56) References Research Practical Use Report Vol. 26 No. 2 (1977               Year) Nippon Telegraph and Telephone Public Corporation Musashino Communication Laboratory               Issuance, p. (407-413)                 Japan Institute of Invention and Innovation Technical Report vol. 11-29.               Official skill number 86-8397 (June 20, 1986)

Claims (1)

(57) [Claims] A magnetic disk, including a magnetic head, utilizing the dynamic pressure generated between the magnetic head and the magnetic disk by running the magnetic disk, the magnetic head,
A magnetic disk device for maintaining a flying height between the magnetic disk and the magnetic disk, wherein the flying height is 0.1 μm or less, and the magnetic head has a floating surface on a surface side facing the magnetic disk. The slider has a read / write element attached to the air outflow end side, the slider has a thickness from the floating surface to the opposing surface of 0.65 mm or less, and a length in the air outflow direction of 1 mm to 3 mm. A magnetic disk drive having a width of 1 mm to 2.5 mm in a direction perpendicular to the air outflow direction. 2. 2. The magnetic disk drive according to claim 1, wherein the air bearing surface of the magnetic head is a flat surface having no tapered surface in an air inflow portion.