JPH03224191A - Disk drive - Google Patents

Abstract

PURPOSE:To prevent the occurrence of relative positional deviation between a disk and a head by clipping a packing between inside and outside faces of a cover and chassis which are fitted to each other. CONSTITUTION:A packing 6 is interposed between inside and outside faces of a cover 5 and a chassis 4. That is, the packing 6 is attached to a peripheral wall 8 of the chassis 4 and the cover 5 is fitted to the outside periphery of the peripheral wall 8 of the chassis 4 in this state, and then, the packing 6 is compressed on the inside peripheral surface of the cover 5, and the outer peripheral side of the packing 6 is fitted to an annular groove 17 provided on the inside peripheral surface of the cover 5, and the chassis 4 and the cover 5 are set to the snap connection state with the packing between them. Consequently, the occurrence of strain on the upper face of the chassis 4 due to the moment of bending which acts upon the chassis at the time of attaching the cover 5 to the chassis 4 is suppressed. Thus, the interval between a spindle shaft and a revolving shaft 12 of a head 13 is prevented from being changed at the time of attaching the cover.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a hard disk drive used in a computer memory device, for example, in which a cover is attached via packing to a chassis to which a disk and an actuator are attached, thereby sealing the inside. The present invention relates to a disk drive suitable for use in applications such as the present invention.

[Summary of the Invention] The present invention includes a chassis to which a disk and a head are attached;
A disk comprising: a cover attached to the chassis; and packing interposed between the chassis and the cover, the packing sealing a space surrounded by the chassis and the cover, and the disk being disposed inside the surrounding space. In disk drives designed to protect actuators from external dust, etc., by fixing the packing to the cover and chassis on the inner and outer peripheral surfaces, distortion of the chassis due to bending stress due to the elastic force of the packing can be avoided. This makes it possible to suppress the occurrence of such problems.

[Prior Art] As shown in FIGS. 3 and 4, a hard disk drive used in a computer memory device, etc. generally has a cover 105 attached to a chassis 103 with a disk 101 and a head 102 via a packing 104. It has become.

The packing 104 includes the chassis 103 and the cover 105.
By sealing between the chassis 10 and the
3 and the cover 105 from entering the surrounding space 106, and the disk 101 and the head 1 in the surrounding space 106 are prevented from entering the surrounding space 106 of the cover 105.
This is to protect 02 from dust and the like. 107,
108 is a packing attachment part provided on the upper and lower surfaces of the chassis 103 and the cover 105 to sandwich the packing 104; Top 1 Packing mounting surface 10 provided on the top surface
The packing 104 is compressed between 7 and 108.

[Problem to be solved by the invention] By the way, in this type of conventional disk drive,
As described above, the packing 104 is interposed between the packing attachment part 107 provided on the upper surface of the shear 103 and the packing attachment part 108 provided on the lower surface of the cover 105, and the cover 105 is attached to the shear 103 with the screws 109...
109, and tighten the packing mounting portions 107, 10.
Since the packing 104 was configured to be compressed between 8 and 8, there were problems as described below.

(1) Attach the chassis 103 and cover 105 with screws 109...
・When tightened with 109, the packing attachment part 107
, 108 bending stress due to flatness and packing 10
Bending stress is generated due to the elastic force of No. 4, and distortion occurs in the chassis 103.

Especially when the chassis 103 is made of sheet metal or plastic, the distortion becomes large.

(2) When distortion occurs in the chassis 103, the disk +01
A relative positional shift occurs between the head 102 and the head 102, which adversely affects recording and reproduction.

Particularly in the case of the sector servo system, the cover 105 is attached in advance by servo writing, and this has a large effect.

(3) Since the amount of distortion of the chassis 103 changes depending on the amount of tightening of the screws 109...109, it is difficult to adjust the amount of tightening.

The present invention solves the above-mentioned conventional problems, suppresses distortion in the chassis when attaching the cover to the chassis, and
The purpose of this invention is to provide a disk drive that can prevent relative misalignment between the disk and the head.

[Means for Solving the Problems] The chassis includes a chassis to which a disk and a head are attached, a cover attached to the chassis, and packing interposed between the chassis and the cover, and the packing allows the chassis to In the disk drive in which the space between the cover and the cover is sealed to prevent dust from entering between them, the packing is interposed between the inner and outer peripheral surfaces of the cover and the shear.

[Function] Since the chassis is subjected to bending stress due to the elastic force of the packing and the like on the peripheral surface (side surface) of the chassis, the bending moment acting on the chassis is reduced, so that distortion of the chassis can be suppressed.

[Example] Next, the present invention will be explained with reference to FIGS. 1 and 2.

1 is a disk drive of the present invention, and the disk drive 1 includes a chassis 4 on which a disk 2, a head 3, etc. are attached, a cover 5 attached to the chassis 4, and a cover 5 interposed between the chassis 4 and the cover 5. Packing 6
By sealing between the cover 5 and the chassis 4 with the packing 6, dust and the like are prevented from entering the cover 5, and the disk 2, head 3, etc. are protected from the dust and the like. It looks like this.

The chassis 4 is formed into a cross-sectional shape by bending the four circumferences of a rectangular metal flat plate 7 downward at a substantially right angle to form a peripheral wall 8. The disk 2 and the head are mounted on the flat plate 7. 3 is installed.

The disk 2 is fixed on a turntable 9 and is rotated by a spindle motor 10. Further, the head 3 is attached to one end side (free end side) of a head support arm 11, and the other end side of the head support arm 11 is pivotably supported on a pivot shaft 12 so as to be rotatable. It is driven and operated by a voice coil motor 13. The voice coil motor 13 includes a voice coil 14 attached to the end of the head support arm 11 on the pivot shaft 12 side, and a magnetic circuit 15 including a fixed yoke, a permanent magnet, etc. arranged on the chassis 4. There is.

Then, the disk 2 is driven by the spindle motor 10.
When the head support arm 11 is rotated by the voice coil motor 13 while rotating the head support arm 11, the head 3 attached to the free end side of the head support arm 11 moves in the radial direction of the disk 2 while recording and recording. It is designed to play.

Further, the packing 6 is made of a rubber or plastic material in the shape of a so-called O-ring, and is adapted to be attached to a packing attachment portion 16 provided on the outer peripheral surface of the peripheral wall 8 of the chassis 4.

The packing attachment portion 16 is formed in the shape of a ring-shaped groove with a substantially semicircular cross section at a position close to the flat plate 7 of the peripheral wall 8 (a position where the level difference with the flat plate 7 is as small as possible),
The inner circumferential side of the O-ring-shaped packing 6 is fitted into the packing attachment portion 16, and the packing 6 is attached to the circumferential wall 8 with the outer circumferential side protruding from the outer circumferential surface of the circumferential wall 8.

Then, when the cover 5 is fitted to the outer circumference of the circumferential wall 8 of the chassis 4 with the packing 6 attached to the circumferential wall 8 of the chassis 4, the packing 6 is compressed on the inner circumferential surface of the cover 5, and the cover 5 is compressed. When inserted to a predetermined position, the outer circumferential side of the packing 6 fits into the ring-shaped groove 17 provided on the inner circumferential surface of the cover 5, and the shear 4 and the cover 5 are connected via the packing 6 by a so-called snap connection. At the same time, due to the packing 6 interposed in a compressed state between the outer circumferential surface of the chassis 4 and the inner circumferential surface of the cover 5 as described above, the space between the chassis 4 and the cover 5 is completely closed. It becomes sealed.

Note that 18...18 are tongue pieces provided at the lower ends of the four peripheral walls of the cover 5 to prevent them from coming off. Also, with just snap connections,
If the bonding strength between the chassis 4 and the cover 5 is weak, auxiliary bonding means such as bonding the cover 5 to the peripheral wall 8 of the chassis 4 with screws or the like may be used.

[Effects of the Invention] As described above, the disk drive of the present invention has the packing interposed between the inner and outer peripheral surfaces of the cover and the chassis, and therefore has the following effects.

(1) Compared to the conventional case where the cover was attached to the top of the chassis, the bending moment acting on the chassis when attaching the cover to the chassis can be reduced, thereby reducing the relative positional misalignment between the disk and the head. This allows the use of sheet metal or plastic chassis.

(2) The cover can be assembled to the chassis by a simple method of fitting the cover into the chassis, reducing the number of assembly steps and the number of parts for assembly.

[Brief explanation of drawings]

Fig. 1 is a perspective view of the disk drive of the present invention with the cover removed, Fig. 2 is a sectional view of the main parts with the cover assembled, and Fig. 3 is a perspective view of the conventional example with the cover removed. , FIG. 4 is a cross-sectional view of the cover assembled. l...disk drive, 2...disk, 3...
・Head, 4...Chassis, 5...Cover, 6...
·packing. Cover removed left 1 Friend's surplus prisoner 1 --- Screen drive 2-11 Screen 3 --- 1 △ 1F 4 --- Sharn 5-- Eleven girlfriend\- 6 --- Bar 1 Kink Cover E Twin Is 1 Pressed Cane Bear M-view Figure 2 109 Painting of 4-legged table φ Figure 3 Figure 846-1 Conventional Italy Figure 4 Procedural amendments (Voluntary) January 21, 1991

Claims (1)

[Claims] (1) It includes a chassis to which a disk and a head are attached, a cover attached to the chassis, and packing interposed between the chassis and the cover, and the packing is attached to the inner and outer peripheral surfaces of the cover and chassis. A disk drive characterized by being interposed between.