JP3021853B2 - 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 disk device which is most suitable for recording and reproducing a hard disk, for example, and more particularly to a sealing device for a draw-out portion of a flexible printed circuit board pulled out of a sealed case.

[0002]

2. Description of the Related Art Conventionally, as shown in FIGS. 3 and 4, a sealed case 1 used for a disk device for recording and reproducing a hard disk has a substantially rectangular shallow box shape formed of metal such as aluminum. And an outer peripheral portion 2 of the chassis 2 and the top cover 3 by means of a substantially square endless gasket 4 made of an elastic material such as rubber.
a and 3a are sealed and formed. At this time, usually, the gasket 4 is bonded to the horizontal lower surface 3b of the outer peripheral portion 3a of the top cover 3 with a double-sided adhesive tape 5 or the like. By tightening, the lower surface 4a of the gasket 4 is crimped on the horizontal upper surface 2b of the outer peripheral portion 2a of the chassis 2, while the gasket 4 is bonded to the upper surface 2b of the outer peripheral portion 2a of the chassis 2 and Outer part 3 of 3
a may be pressed under the lower surface 3b.

[0005] In the sealed case 1, a hard disk 10 which is a disk-shaped recording medium which is rotated and driven by a spindle 9 of a spindle motor 8, and a magnetic head slider 1 which
A pickup arm 13 to which the second arm 2 is attached, a voice coil motor 14, and the like are housed. In the sealed case 1, the spindle motor 9 drives the hard disk 10 to rotate at a high speed in the direction of arrow a, and the voice coil motor 14 drives the pickup arm 13 to swing about the arm shaft 13a in the direction of arrow b. Scanning is performed in the direction of arrow b while the magnetic head slider 12 is flying above the hard disk 10 on the order of submicrons, so that desired recording and reproduction are performed.

[0004] A head amplifier 17 mounted on a flexible printed circuit board 16 is housed in the sealed case 1, and a strip-shaped connecting piece 16 a integrally pulled out from a part of the flexible printed circuit board 16 is magnetic. It is connected to a head slider 12 and a voice coil motor 14.

A slightly wide terminal board 16b is formed integrally with a part of the outer peripheral side of the flexible printed circuit board 16.
Is drawn out from the inside of the sealed case 1 so as to cross a part of the outer peripheral portions 2a and 3a of the chassis 2 and the top cover 3 at a right angle, and is drawn on the lower surface 4a of the gasket 4 on the upper surface 2b of the outer peripheral portion 2a of the chassis 2. Is crimped. At this time, when the gasket 4 is adhered to the chassis 2, the terminal plate 16 b is pressed by the gasket 4 to the lower surface 3 b of the outer peripheral portion 3 a of the top cover 3.

Then, a plurality of external terminals 16c formed at the outer end of the terminal plate 16b are connected to an external amplifier by a connector (none of which is shown), and the head amplifier 17 is connected via the terminal plate 16b. It is configured to input and output power and signals to and from the pickup device 11 such as power supply to the magnetic head slider 12, transmission of recording and reproduction signals to the magnetic head slider 12, and transmission of control signals to the voice coil motor 14. .

[0007]

However, conventionally, as shown in FIGS. 4A and 4C, the terminal plate 16 is connected to the gasket 4.
When b is crimped, the gasket 4 floats on both side edges 16d of the terminal plate 16b, and a gap 18 is formed between the gasket 4 and both side edges 16d. Moreover, the terminal plate 16b
Since both side edges 16d are formed in a straight line, the gap 18 penetrates between the inside and the outside of the sealed case 1 in a straight line at the shortest distance.

Therefore, as shown by an arrow a in FIG. 4A, dust in the outside air easily enters the sealed case 1 at the shortest distance through the gap 18 and is drawn out from the sealed case 1. There is a problem in that the degree of sealing of the terminal plate 16b, which is a drawn-out portion of the flexible printed circuit board 16, is very low. If dust in the outside air enters the sealed case 1 and adheres to the hard disk 10 and the like, the hard disk 10 and the magnetic head slider 12 are destroyed, and fatal inconveniences such as dropout during recording and reproduction occur. .

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problem, and there is provided a disk drive capable of remarkably improving the degree of sealing of a drawn-out portion of a flexible printed circuit board drawn out of a sealed case. It is intended to provide.

[0010]

According to a first aspect of the present invention, there is provided a disk apparatus comprising: a sealing case in which an outer peripheral portion between a chassis and a top cover is sealed with an elastic gasket; The disk-shaped recording medium and the pickup device accommodated therein, and for inputting / outputting signals and the like to / from the pickup device pulled out from the inside of the sealed case to the outside and crimped between the gasket and the chassis or the top cover. In a disk device having a flexible printed board, a pair of protrusions having a width smaller than the width of the gasket are integrally formed on both side edges of a portion of the flexible printed board pressed by the gasket.

[0011]

According to the disk device of the present invention constructed as described above, when the flexible printed circuit board is press-fitted with the gasket, the tips of the pair of small projections can be cut into the gasket. The gap generated between the edge and the gasket can be made very small. Moreover, this gap has a sufficiently long and bent shape along the outer shape of the small projection.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a disk drive according to the present invention will be described below with reference to FIGS. The same structural parts as in FIGS. 3 and 4 are denoted by the same reference numerals, and redundant description will be omitted. First, as shown in FIG. 2 and FIG. 1A, the gasket 4 is placed substantially at the center of both side edges 16d of the crimped portion (portion shown by oblique lines) 16e of the terminal plate 16b of the flexible printed board 16 with the gasket 4. A pair of small protrusions 20 having a width W2 smaller than the width W1 and having a substantially mountain shape are integrally formed.

As a result, as shown in FIG. 1C, the terminal plate 16b is connected to the outer peripheral portion 2a of the chassis 2 by the gasket 4.
When press-fitted on the upper surface 2b of the gasket 4, the tip portions 20a of the pair of small projections 20 concentrate the stress on the lower surface 4a of the gasket 4, so that these tip portions 20a can be bitten into the gasket 4. The gap 21 generated between the gasket 4 and both side edges 16d of the terminal plate 16b is shown in FIG.
(C) can be made very small as compared with the conventional gap 18 shown in FIG.

Moreover, the gap 21 between the side edges 16d is provided.
Is formed over a sufficiently long distance along the outer shape of the pair of small protrusions 20, and a substantially central portion in the middle of the gap 21 in the length direction is substantially formed along the outer shape of the pair of protrusions 20. The shape is bent into a mountain shape.

Therefore, even if dust in the outside air enters the sealed case 1 through the gap 21,
Since 1 is very small, dust is very difficult to penetrate.
In addition, as shown by an arrow b in FIG. 1A, dust in the outside air must enter the gap 21 having a long length while bending, so that the dust is harder to enter.
Therefore, the degree of sealing of the terminal plate 16b, which is the drawn-out portion of the flexible printed board 16 drawn out of the sealed case 1, can be significantly improved, and the sealed case 1 can be improved.
Intrusion of dust into the inside can be prevented as much as possible.

As described above, one embodiment of the present invention has been described.
The present invention is not limited to the embodiments described above, and various modifications can be made based on the technical idea of the present invention. For example, the present invention is not limited to a disk device for recording and reproducing a hard disk, but is applicable to a disk device for recording and reproducing various disk-shaped recording media.

[0017]

The disk device of the present invention is constructed as described above, and has the following effects.

A pair of projections having a width smaller than the width of the gasket are integrally formed on both side edges of a pressure-bonded portion of the flexible printed circuit board drawn out from the inside of the sealed case to the outside by the gasket. When crimped, the tip portions of the pair of small protrusions can be made to bite into the gasket, so that the gap generated between both side edges of the flexible printed board and the gasket can be extremely small, In addition, since this gap is made sufficiently long along the outer shape of the small projection and has a bent shape, it is possible to remarkably improve the degree of sealing of the drawn portion of the flexible printed circuit board drawn out of the sealed case. As a result, it is possible to prevent dust in the outside air from entering the sealed case as much as possible.

Forming a pair of small projections integrally on both side edges of the pressure-bonded portion of the flexible printed circuit board by the gasket simply requires changing the shape of the die for pressing the flexible printed circuit board. It is very simple and does not cause any cost increase by forming a pair of small projections.

[Brief description of the drawings]

FIG. 1A is a plan view of a main part showing a shape of a flexible printed circuit board according to an embodiment of the present invention, and FIGS. 1B and 1C are diagrams of a flexible printed circuit board using a gasket. AA of FIG. 1A for explaining the crimping
It is a line sectional view.

FIG. 2 is a partially cutaway plan view of a disk device to which the flexible printed board of the present invention is applied.

3A is a partially cutaway plan view showing a conventional disk device, and FIG. 3B is an enlarged cross-sectional view taken along line BB of FIG. 3A. It is.

FIG. 4A is a plan view of a main part showing the shape of a conventional flexible printed circuit board, and FIG.
FIG. 5C is a cross-sectional view taken along line CC of FIG. 4A for explaining pressure bonding of the flexible printed circuit board by the gasket.

[Explanation of symbols]

 Reference Signs List 1 sealed case 2 chassis 2a outer peripheral portion of chassis 2b upper surface of outer peripheral portion of chassis 3 top cover 3a outer peripheral portion of top cover 3b lower surface of outer peripheral portion of top cover 4 gasket 4a lower surface of gasket 6 screw 10 hard disk (disk-shaped recording medium) DESCRIPTION OF SYMBOLS 11 Pickup device 16 Flexible printed board 16b Terminal board of flexible printed board 16d Both side edges of the terminal board of flexible printed board 16e Crimped portion of terminal board of flexible printed board 20 Small projection 20a Tip of small projection 21 Gap W1 Width of gaicket W2 Small protrusion width

Claims (1)

(57) [Claims] 1. A sealed case in which an outer peripheral portion between a chassis and a top cover is sealed with an elastic gasket, a disk-shaped recording medium accommodated in the sealed case and a pickup device therefor, and A disk device comprising a flexible printed board for inputting / outputting a signal or the like to the pickup device which is drawn out to the outside and crimped between the gasket and the chassis or the top cover; A disk device, wherein a pair of projections having a width smaller than the width of a gasket are integrally formed on both side edges of a crimped portion.