JPH0828112B2 - Magnetic disk unit - 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 device, and more particularly to a magnetic disk device including a magnetic disk, a magnetic head, and a base plate and a cover plate accommodating them.

[0002]

2. Description of the Related Art In recent magnetic disk devices, on the one hand, the storage density is being increased with the intention of increasing the storage capacity, and on the other hand, the overall size and weight of the device is being reduced.

Among these, to increase the storage capacity, that is, to increase the capacity of the magnetic disk device, the track pitch (TPI) and linear density (BPI) of the magnetic disk are increased. Is required. This makes it essential to reduce the flying height of the magnetic head from the magnetic disk and to reduce the plane roughness of the magnetic disk and the magnetic head.

In order to reduce the size and weight, it is necessary to reduce the size and weight of parts (thinner parts) and improve the accuracy.

Conventionally, in a magnetic disk device, as shown in FIG. 7, a magnetic disk 52 is fixed on a spindle hub 54 and arranged on a plane of a rotating magnetic disk 52, and is positioned by a voice coil motor 57 as a driving source. Recording and reproduction are performed by the head 55. In order to include and seal the spindle 65 and the carriage 64, a gasket 58e is provided around the base plate 63b that fixes the spindle 65 and the carriage 64, and the gasket 58e is sandwiched between the base plate 63b and the cover plate 51b and fixed. It was.

[0006]

However, in this conventional magnetic disk device, the thickness of the base plate and the cover plate becomes thinner as the size and weight of the magnetic disk device become smaller, and the rigidity in the direction perpendicular to the plane of the magnetic disk becomes very weak. The structure is easily deformed. Therefore, in the conventional example of stacking the base plate, the gasket, and the cover plate in the direction perpendicular to the plane of the magnetic disk, the base plate and the cover plate are always deformed by the reaction force from the gasket accompanying the compression mounting of the gasket. Therefore, there is a problem in that the positions of the spindle and the carriage change over time, which hinders recording and reproduction on the magnetic disk by the magnetic head.

[0007]

SUMMARY OF THE INVENTION An object of the present invention is to improve the disadvantages of the conventional example, and in particular, to provide a magnetic disk drive having a structure capable of effectively avoiding the positional deviation between the base plate and the cover plate and the accompanying change in the positions of the spindle and the carriage. The purpose is to provide.

[0008]

According to the present invention, a spindle on which a magnetic disk is mounted, a magnetic head and a carriage for the magnetic head, which are installed corresponding to the magnetic disk, and a base plate for accommodating and supporting these parts are provided. A magnetic head equipped with a plurality of magnetic disks mounted on a spindle and a carriage for the magnetic head; a base plate for accommodating and supporting these parts; It is provided with a cover plate for accommodating and supporting it, and a sealing gasket provided at a contact portion of each plate.

A convex portion that prevents the gasket from being separated from the sealed portion is provided on the outer peripheral portion of the base plate, and an inclined surface is formed over the entire surface of the opening portion of the cover plate that contacts the gasket. The composition is adopted. This aims to achieve the above-mentioned object.

[0010]

[Operation] It is possible to securely seal the inside of the device by the convex portion on the outer periphery of the base plate, the inclined surface of the cover plate, and the gasket mounted between them, and the inclined surface of the cover plate acts as an appropriate gasket. It becomes possible to press with the pressing force of 1. Therefore, it is possible to eliminate the disadvantage that the cover plate moves due to the reaction force of the gasket as in the conventional example.

[0011]

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

The embodiment shown in FIGS. 1 and 2 includes a spindle hub 4 on which a magnetic disk 2 is mounted, a magnetic head 5 mounted corresponding to the magnetic disk 2 and a carriage 14 for the magnetic head 5. A base plate 13 for accommodating and supporting each of these parts, a cover plate 1 having an opening on the side abutting the base plate 13 for accommodating and accommodating each component together with the base plate, and each of these plates 1, 1
3, and a sealing gasket 8 provided at the abutting portion of No. 3.

A convex portion 13A for preventing the gasket 8 from being separated from the hermetically sealed portion is provided on the outer peripheral portion of the base plate 13. Further, an oblique inclined surface 1A is formed on the entire surface of the opening of the cover plate 1 that abuts the gasket 8.

This will be described in more detail. In FIG. 1, a magnetic disk 2 is fixed to a spindle hub 4 by a disk clamp 3, the spindle hub 4 is held by a motor base 9 via a bearing 10, and a motor (a rotor 12 and a status 11) is rotated by a drive source. Has become.

A magnetic head 5 for recording and reproducing information on and from the magnetic disk 2 is supported by a coil arm 6 and positioned at a predetermined position on the magnetic disk 2 by a voice coil motor 7. . The spindle 15 and the carriage 14 are fixedly mounted on the base plate 13, and the cover plate 1, the gasket 8 and the base plate 13 have a structure in which the spindle and the carriage are enclosed and sealed.

Next, the base plate 13 and the gasket 8
The enlarged seal structure of the cover plate 1 and the cover plate 1 shown in FIG.
The enlarged view).

In FIG. 2, the projection 13A having a surface perpendicular to the plane of the magnetic disk 2 is provided on the entire circumference of the base plate 13 as described above. A gasket 8 (O-ring type) is attached to the outer periphery of the convex portion.
The cover plate 1 having the inclined surface 1A at an angle α (α ≦ 45 °) is arranged, and the gasket 8 is compressed at the tip end surface portion of the inclined surface 1A to seal the inside of the magnetic disk device. There is.

FIG. 3 shows a second embodiment. In this embodiment, only an enlarged view of the seal structure of the base plate 13, the cover plate 1 and the gasket 8a is shown. In FIG. 3, a convex portion 13A having a surface perpendicular to the plane of the magnetic disk 2 is provided on the entire outer circumference of the base plate 13. A gasket 8a (D-ring type) is attached to the inner peripheral side of the convex portion 13A, and the cover plate 1 has an inclined surface 1A at an angle α (α ≦ 45 °) with respect to the inner periphery of the gasket 8a. The gasket 8a is compressed so that the magnetic disk device is sealed.

A third embodiment of the present invention is shown in FIG. 4, a fourth embodiment is shown in FIG. 5, and a fifth embodiment is shown in FIG. In these figures, reference numeral 8b indicates a T ring type gasket, reference numeral 8c indicates an X ring type gasket, and reference numeral 8d indicates a triangular ring type gasket.

[0020]

Since the present invention is constructed and functions as described above, according to this, the inside of the device is reliably sealed by the convex portion on the outer periphery of the base plate, the inclined surface of the cover plate, and the gasket provided between the both. It becomes possible to
By the action of the inclined surface of the cover plate, the gasket can be pressed with an appropriate pressing force, which can eliminate the disadvantage that the cover plate moves due to the reaction force of the gasket as in the conventional example, and therefore the base plate It is possible to provide an unprecedented excellent magnetic disk device capable of effectively avoiding the positional deviation of the cover plate and the positional change of the spindle and the carriage due to the positional deviation, and improving the durability and reliability.

[Brief description of drawings]

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

FIG. 2 is an enlarged explanatory view of a portion A in FIG.

FIG. 3 is a sectional view showing a gasket portion in a second embodiment of the present invention.

FIG. 4 is a sectional view showing a gasket portion in a third embodiment of the present invention.

FIG. 5 is a sectional view showing a gasket portion in a fourth embodiment of the present invention.

FIG. 6 is a sectional view showing a gasket portion in a fifth embodiment of the present invention.

FIG. 7 is a sectional view showing a conventional example.

[Explanation of symbols]

 1 Cover Plate 1A Inclined Surface 2 Magnetic Disk 4 Spindle Hub 5 Magnetic Head 8, 8a, 8b, 8c, 8d Gasket 13 Base Plate 13A Convex 14 Carriage

Claims (4)

[Claims] 1. A spindle hub on which a magnetic disk is mounted, a magnetic head mounted corresponding to the magnetic disk and a carriage for the magnetic head, a base plate for accommodating and supporting each of these parts, and a contact between the base plate. In a magnetic disk device provided with a cover plate which is opened on the contact side and accommodates and supports each of the constituent parts together with the base plate, and a gasket for sealing provided in the abutting part of each plate, from a sealing portion of the gasket The magnetic disk device is characterized in that a convex portion for preventing the detachment of the base plate is provided on the outer peripheral portion of the base plate, and a surface of the opening of the cover plate that abuts the gasket is an inclined surface over the entire surface. 2. The magnetic disk drive according to claim 1, wherein the inclined surface is formed by obliquely cutting the entire surface of the opening of the cover plate that comes into contact with the gasket. 3. The magnetic disk drive according to claim 1, wherein the gasket is arranged inside the opening of the cover plate. 4. The magnetic disk drive according to claim 1, wherein the gasket is arranged outside the opening of the cover plate.