JP2734984B2 - Magnetic disk drive - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic disk drive, and more particularly to a magnetic disk drive which is an external storage device of a computer.

[0002]

2. Description of the Related Art In a conventional magnetic disk drive, as shown in FIG. 3, a disk-shaped magnetic disk medium 51 is screwed to a spindle 52A forming a part of a rotary drive motor 52 by a screw 53A. In this FIG.
Denotes a main body case of the magnetic disk drive, and reference numeral 54 denotes an arm assembly that supports the magnetic head 54a. Also,
Reference numeral 55 denotes a disk medium holding plate.

[0003]

In this conventional magnetic disk drive, the magnetic disk medium 51 is deformed by distortion or the like by tightening the screw 53A. This tendency tends to increase with the downsizing of the magnetic disk drive. That is, if the magnetic disk medium 51 is reduced in weight and diameter in accordance with the miniaturization of the magnetic disk device, the magnetic disk medium 51 becomes thinner, so that deformation due to screw tightening appears more.

[0004] For this reason, as the size of the magnetic disk device is reduced, the flying attitude of the magnetic head is disturbed, the read / write characteristics are deteriorated, and a head crash is liable to occur.

[0005]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a miniaturized magnetic disk drive capable of improving the disadvantages of the prior art and, in particular, having good read / write characteristics and effectively suppressing the occurrence of a head crash. Aim.

[0006]

Means for Solving the Problems To achieve the above object,
According to the present invention, there is provided a magnetic head equipped corresponding to a magnetic disk medium, and a spindle having a T-shaped cross section provided with a spindle shaft at a center portion and a disk portion having a flat end surface at one end. parts and, the motor base for rotatably supporting the spindle shaft, before being mounted on the motor base
And a drive motor unit for rotatingly driving the spindle unit described above . The magnetic recording medium is provided on the entire surface of the disk at the one end of the spindle.

[0007]

According to the present invention, the flat surface 3a of the spindle section 3 on which the recording layer 6 of the magnetic recording medium section is formed has a flatness of 2 [μm] or less, respectively, before and after assembly. Has been confirmed. In this regard, in the conventional example, even if the flatness of the magnetic disk medium having a diameter of 48 [mm] and a plate thickness of 0.381 [mm] when it is not clamped is 2 [μm] or less, the spindle unit 3 is tightened by screwing. Although the flatness usually becomes 10 [μm] or more when fixed to the substrate, the flatness is greatly improved.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS.

In FIG. 1, reference numeral 1 denotes a motor base. The motor base 1 is fixed to the case main body 2 in a state where the upper side is opened in FIG. At the center of the motor base 1, there is provided a cylindrical support 1 </ b> A extending upward from the center of the motor base 1.

Reference numeral 3 denotes a spindle unit. The spindle portion 3 has a disk portion 3B having a spindle shaft 3A directed downward in FIG. 1 at a central portion and having a flat surface 3a at one end surface.
Are formed in a T-shaped cross section. The spindle portion is configured such that the spindle shaft 3A is connected to the cylindrical support 1 described above.
A, and the bearing 4 is attached to the cylindrical support 1A.
It is rotatably supported via A and 4B.

A drive motor unit 5 is provided in the motor base 1 around the cylindrical support 1A.
The drive motor unit 5 is provided with a drive coil unit 5A fixed to the motor base 1 and, corresponding to the drive coil unit 5A, hangs down from the periphery of the disk unit 3B of the spindle unit 3 downward in FIG. And a magnet section 5B.

The flat surface 3a of the disk 3B of the spindle 3
Is provided with a magnetic recording layer 6 constituting a magnetic disk medium in the form of a film. A protective layer 7 and a lubricating layer 8 are sequentially laminated on the outer surface of the magnetic recording layer 6 in FIG. 1 (the upper end surface in FIG. 1). The flat surface 3a at one end of the spindle portion 3 is provided with fine irregularities in advance so that the magnetic recording layer 6 can be firmly attached to the flat surface 3a of the disk portion 3B (the upper end portion in FIG. 1) of the spindle portion 3. Fixed (attached).

More specifically, in FIG. 1, the diameter of the disk portion 3B of the spindle portion 3 is set to 48 [mm]. Further, the magnet portion 5B covers the outside of the drive coil portion 5A fixed to the motor base 1, so that ACC 4.0 [m / S ² ] or less (at 3600 [rpm]).
It is equipped to be able to rotate at 5400 [rpm] without greatly shaking.

Further, the disk portion 3 of the spindle portion 3 described above.
The flat surface 3a, which is the outer surface of B, is polished so as to have a flatness of 2 [μm] or less, and then has a center line average roughness “Ra = 5 to 6” having a circumferential directionality over the entire surface. [N
[m]] is formed by polishing with a loose abrasive method. On top of that, a recording layer 6 made of a magnetic material and having a thickness of 30 nm,
A protective layer 7 having a thickness of 20 nm and a lubricating layer 8 having a thickness of 3 nm are sequentially formed in a film shape.
0 is formed. Reference numeral 54 denotes an arm assembly that supports the magnetic head 54a, and reference numeral 2A denotes a main body cover. Other configurations are the same as those of the above-described conventional example.

In this embodiment, the flat surface 3a of the spindle section 3 on which the recording layer 6 is formed has a flatness 2
[Μm] or less was confirmed to be maintained. In this regard, in the conventional example, the diameter is 48 [mm] and the plate thickness is 0.381.
Even if the flatness of the non-clamped magnetic disk medium of [mm] is 2 [μm] or less, the flatness usually becomes 10 [μm] or more by fixing to the spindle unit 3 by screwing. On the other hand, the flatness has been greatly improved.

[0016] Thus, in the above embodiment, since there is provided a direct magnetic disk medium part (magnetic recording medium portion) 10 on the flat surface 3a of the spindle 3, the magnetic disk medium part (magnetic
This eliminates the occurrence of deformation distortion or the like in the recording medium section 10 and saves the labor for attaching the magnetic disk medium section (magnetic recording medium section ) 10 to a rotary drive motor or the like.
Therefore, there is an advantage that the efficiency of the assembly work at the time of production can be significantly improved.

In this case, an ultrasonic motor that converts high-frequency elastic vibration generated by a voltage element into a mechanical output using frictional force may be used as the rotary drive motor. By doing so, there is an advantage that noise during driving and electromagnetic induction noise are reduced.

[0018]

Since the present invention is constructed and functions as described above, according to the present invention, the magnetic disk medium (magnetic recording medium) is provided on the entire surface of the disk of the spindle which forms a part of the drive motor.
Body), the screwing work conventionally required when assembling the magnetic disk medium is not required, and the distortion of the magnetic disk medium conventionally caused by the screwing is eliminated. Therefore, when the size is reduced, it is possible to almost completely eliminate the disadvantage that the flying attitude of the magnetic head is disturbed, the read / write characteristics are deteriorated, and a head crash is likely to occur. Since it is not necessary to set a storage area, the storage area can be increased accordingly, and the storage capacity can be increased in this respect. The present invention provides an unprecedented excellent magnetic disk drive that can significantly improve the performance and can reduce the cost in this respect. Door can be.

[Brief description of the drawings]

FIG. 1 is a partially omitted sectional view showing an embodiment of the present invention.

FIG. 2 is a perspective view showing an assembled state of the embodiment of FIG. 1;

FIG. 3 is a schematic exploded perspective view showing a conventional magnetic disk drive.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Motor base 3 Spindle part 3A Spindle shaft 3a Flat surface 5 Drive motor part 6 Magnetic recording layer 7 Protective layer 8 Lubrication layer 10 Magnetic disk medium part (magnetic recording medium part ) 54a Magnetic head

Claims (1)

(57) [Claims] 1. A magnetic head provided corresponding to a magnetic disk medium, a spindle shaft provided at a central portion and one end portion provided.
A spindle part having a T-shaped cross section provided with a disk part having a flat end surface, a motor base rotatably supporting the spindle shaft, and a drive mounted on the motor base to rotate the spindle part A magnetic disk drive, comprising: a motor unit; and a magnetic recording medium unit formed on the entire surface of the disk unit at one end of the spindle unit.