JPH0294191A - Hard disk drive - Google Patents

Abstract

PURPOSE:To obtain a hard disk drive which is low in cost, high in reliability, and light in weight by principally constituting the base frame of the drive of a bottom section and partially notched side wall section and constituting the cover of the device of an upper face section, hanging section, and hooking section and setting the angle between the hooking section and top section to 5-45 deg.. CONSTITUTION:A base frame 2 is constituted of a base frame bottom section 21 and base frame side wall section 23 provided with a base frame notch section 22 and a cover 1 is composed of a cover upper face section 11 and cover hanging section 12, with the section 11 covering the upper opening of the frame 2 and section 12 covering the notch section 22. Thus the base frame 2 and cover 1 form an airtight structure. The cover 1 is fixed to the frame 2 with screws 3 after the base frame 2 is sandwiched between a hooking section 13 and upper section 11 of the cover 1. The angle between the hooking section 13 and top section 11 is set to 5-45 deg.. Therefore, a hard disk drive which is low in cost, high in reliability, and light in weight can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to the structure of a hard disk drive, particularly the attachment of a cover and a base frame.

[Conventional technology]

FIG. 2 shows a cross-sectional view of the structure of attaching a cover and a base frame in a conventional hard disk drive.

100 is a cover made of sheet metal, 200 is a base frame made of Guicast, and 3 is a cover set screw. The cover set screws 3 are provided on two sides of the cover, and 2 to 3 are required per side. The cover 100 is formed by deep drawing.

The base frame 200 is formed into a generally flat shape.

[Problem to be solved by the invention]

Conventional hard disk drives have had the following problems.

First, in order to fix the cover 100 to the base frame 200, cover set screws 3 were required on both sides of the cover, which required a large number of screw tightening steps and a large number of parts.

Second, since both sides of the cover are fixed, if the thermal expansion coefficients of the cover 100 and the frame 200 differ, the entire hard disk drive will warp due to changes in ambient temperature, causing the heads (not shown) and disks (not shown) to warp. A relative position shift, so-called off-1-rack, occurred.

Third, since both sides of the cover 100 are fixed by the cover set screws 3, the tightening of the cover set screws 3 depends on the difference between the center distance of the tapped holes on the cover 100 side and the center distance of the tapped holes on the base frame 200 side. The cover 100 and base frame 200 sometimes deformed together, causing off-track.

Fourth, the cover 100 is formed entirely by deep drawing, making it difficult to process and expensive. Moreover, the material had to be selected to be suitable for deep drawing, and it was difficult to match the thermal expansion coefficient with that of the base frame 200.

Fifth, since the base frame 200 is substantially plate-shaped, its rigidity is low. If the thickness is increased in order to improve this rigidity, it becomes heavy, which is inconvenient. If the rigidity was insufficient, the base frame 200 would be deformed by the force of attaching the hard disk drive to the host, resulting in off-track.

It is an object of the present invention to solve these problems of conventional hard disk drives and to realize a hard disk drive that is inexpensive, highly reliable, and lightweight.

[Means to solve the problem]

A hard disk drive according to the present invention is a hard disk drive comprising a cover made of sheet metal and a base frame made of a molded product such as die-casting, wherein the base frame generally consists of a bottom part and a partially cutout side wall part, while the cover consists of an upper surface portion, a hanging portion, and a hook portion, and is characterized in that the hook portion and the upper surface portion form an angle of 5° to 45°.

[For production]

The cover hook part is hooked on the outside of the base frame bottom part, the cover hanging part covers the notch in the base frame side wall part, and the top surface of the cover covers the upper opening of the base frame. The cover can be fixed to the base frame by simply providing the cover set screws on the top surface of the cover, on the side opposite to the hanging part.

〔Example〕

FIG. 1(a) is a plan view of an embodiment of a hard disk drive according to the present invention, and FIG. 1(b) is a sectional view thereof.

1 indicates the entire cover, and 2 indicates the entire base frame. 11
Reference numeral 12 indicates a cover upper surface portion, 12 indicates a cover hanging portion 13 indicates a cover hooking portion, and 14 indicates a constriction portion.

Reference numeral 21 indicates a base frame bottom surface, 22 indicates a base frame side wall notch, and 23 indicates a base frame side wall.

The cover 1 has an airtight structure as a whole, with the cover upper surface part 11 covering the upper opening of the base frame 2 and the cover hanging part 12 covering the pace frame side wall notch part 22.

The cover 1 is fixed to the base frame 2 by sandwiching the base frame 2 between the cover hook part 13 and the cover upper surface part 11 and fixing it with screws 3.

The constricted portion 14 is for sinking the head of the cover set screw 3 so that it does not protrude from the upper surface of the cover 1, and has a very shallow constriction depth. Note that this constriction part 14 is not essential, and if it is acceptable for the head of the cover set screw 3 to protrude from the upper surface of the cover 1, the constriction part 14 is not necessary.

It is sufficient to arrange the cover set screw 3 only on one side of the cover.

Since the base frame 2 has the base frame side wall portion 23, its rigidity is higher than that of a base frame having only a bottom surface portion.

Although the cover 1 has a shallow drawing part 14, it is formed as a whole by bending sheet metal.

The cover hooking part 13 is at an angle of 5° to 45° with respect to the cover upper surface part 11.
This is because when inserting the base frame 2 into the cover 1 from the side, if it is less than 5 degrees, it will be difficult to insert, and if it is more than 45 degrees, it will vibrate.

This is because if a disturbance such as ffi%1 is applied, there is a high possibility that the cover 1 will separate from the upper surface of the base frame 2.

The base frame side wall notch 22 is provided to accommodate a disk (not shown) provided approximately at the center of the base frame 2 and a head (not shown) that reads and writes data from both sides of the disk. Depending on the order of assembly of the head assembly (not shown). That is, since the disk is first assembled into the base frame 2 and then the heads that touch the top and bottom of the disk are assembled, if there is a side wall of the base frame near the disk around the entire outer circumference of the disk, it will interfere with the installation.

〔Effect of the invention〕

The present invention has the following advantages over conventional hard disk drives.

First, the number of screws that fasten the cover is reduced to half compared to the conventional method, reducing the number of screw tightening steps. The number of parts is also reduced.

Second, since the cover is screwed on only one side, the cover and base frame are made of materials with different coefficients of thermal expansion.
The entire hard disk drive will not warp even if the ambient temperature changes. Therefore, no off-track occurs. Furthermore, the degree of freedom in selecting materials for the cover and base frame increases.

Third, since the cover is fixed with screws on only one side, the base frame does not warp when the cover is attached.

Fourth, since the cover can be made by bending, it is easy to process and inexpensive. Materials can also be selected based on parameters other than workability.

Fifth, since the base frame has side walls, its rigidity is high, and there is considerable deformation offset due to the force of attaching the hard disk drive to the host I.

As described above, according to the present invention, it is possible to provide an inexpensive, highly reliable, and lightweight hard disk drive.

[Brief explanation of drawings]

Fig. 1(a) ... Plan view of a hard disk drive according to the present invention Fig. 1(b) ... Cross-sectional view of a hard disk drive according to the present invention Fig. 2 ... Cross-sectional view of a conventional hard disk drive 1.100 2.200 3 ... 11 ... 12 ... 13 ... 14 ... 21 ... 22 ... 23 ... ... Cover ... Base frame cover set screw Cover top part Cover hanging part Cover hook part Squeezing part Base frame bottom part Base frame side wall notch part Base frame side wall part Above Applicant: Seiko Epson Corporation

Claims (1)

[Claims] A hard disk drive comprising a cover made of sheet metal and a base frame made of a molded product such as die-casting, wherein the base frame generally consists of a bottom part and a partially cut-out side wall part, while the cover has a top part and a hanging part. and a hook part, and the hook part and the upper surface part are 5
A hard disk drive characterized by forming an angle of 45° to 45°.