JPH0589652A - Disk device - Google Patents

Abstract

PURPOSE:To remarkably enhance the hermetically sealed degree of an extraction part, at a flexible printed-circuit board, which is extracted from the inside of a hermetically sealed case so that dust particles in the open air hardly creep into the hermetically sealed case. CONSTITUTION:One pair of protrusions 20 whose width W2 is smaller than the width W1 of a gasket 4 are formed integrally on both side edges 16d of a compression-bonded part 16e by using the gasket 4, at a flexible printed-circuit board 16, which has been extracted to the outside from the inside of a hermetically sealed case. When the flexible printed-circuit board 16 is compression-bonded by using the gasket 4, tip parts 20a of the pair of small protrusions 20 can be made to encroach on the gasket.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk device most suitable for recording and reproducing a hard disk, for example, and more particularly to a device for sealing a drawn-out portion of a flexible printed circuit board which is drawn out from a sealed case.

[0002]

2. Description of the Related Art Conventionally, as shown in FIGS. 3 to 4, a hermetically sealed case 1 used in a disk device for recording and reproducing a hard disk is a shallow box-shaped box formed of a metal such as aluminum. An outer peripheral portion 2 of the chassis 2 and the top cover 3 is formed by using a chassis 2 having an open upper portion and a top cover 3 covering the upper portion thereof and a substantially square endless gasket 4 formed of an elastic body such as rubber.
It is formed by sealing between a and 3a. At this time, usually, the gasket 4 is adhered to the horizontal lower surface 3b of the outer peripheral portion 3a of the top cover 3 with the double-sided adhesive tape 5 or the like, and the four corners of the chassis 2 and the top cover 3 are vertically attached to each other by a plurality of screws 6. The lower surface 4a of the gasket 4 is clamped and pressure-bonded to the horizontal upper surface 2b of the outer peripheral portion 2a of the chassis 2. Conversely, the gasket 4 is adhered to the upper surface 2b of the outer peripheral portion 2a of the chassis 2 and the top cover is attached. Outer peripheral part 3
You may make it pressure-bond under the lower surface 3b of a.

In the sealed case 1, a hard disk 10 which is a disk-shaped recording medium rotated by a spindle 9 of a spindle motor 8 and a pickup 11 which is a magnetic head slider 1 are attached to the tip.
A pickup arm 13 to which 2 is attached, a voice coil motor 14 and the like are stored. In the sealed case 1, the spindle motor 9 drives the hard disk 10 to rotate at high speed in the arrow a direction, and the voice coil motor 14 drives the pickup arm 13 to swing about the arm shaft 13a in the arrow b direction. While the magnetic head slider 12 is suspended above the hard disk 10 in the order of submicrons, scanning is performed in the direction of arrow b to perform desired recording and reproduction.

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

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

A plurality of external terminals 16c formed on the outer tip of the terminal board 16b are connected to an external amplifier by a connector (none of which is shown), and the head amplifier 17 is connected through the terminal board 16b. To the pickup device 11 such as supplying power to the magnetic head slider 12, transmitting recording / reproducing signals to the magnetic head slider 12, transmitting control signals to the voice coil motor 14, and the like. ..

[0007]

However, conventionally, as shown in FIGS. 4 (A) and 4 (C), the terminal plate 16 is made up of the gasket 4 as shown in FIG.
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 board 16b
Since both side edges 16d are linearly formed, the gap 18 is linearly inserted between the inside and the outside of the sealed case 1 at the shortest distance.

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

The present invention has been made in order to solve the above-mentioned problems, and provides a disk device capable of remarkably improving the degree of sealing of a drawn-out portion of a flexible printed circuit board which is drawn out from a sealed case. It is intended to be provided.

[0010]

To achieve the above object, a disk device of the present invention is a hermetically sealed case in which an outer peripheral portion between a chassis and a top cover is hermetically sealed with an elastic gasket, and in the hermetically sealed case. For inputting / outputting signals to / from the disk-shaped recording medium and the pickup device housed in the disk, the pickup device being pulled out from the inside of the hermetically sealed case, and crimped between the gasket and the chassis or the top cover. In a disk device provided with a flexible printed circuit board, a pair of protrusions having a width smaller than the width of the gasket are integrally formed on both side edges of the portion of the flexible printed circuit board where the gasket is pressed.

[0011]

In the disk device of the present invention constructed as described above, when the flexible printed circuit board is pressure-bonded with the gasket, the tip portions of the pair of small protrusions can be made to dig into the gasket, so that both sides of the flexible printed circuit board The gap created between the rim and the gasket can be very small. Moreover, this gap has a sufficiently long and bent shape along the outer shape of the small protrusion.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a disk device to which the present invention is applied will be described below with reference to FIGS. It should be noted that the same structural parts as those in FIGS. 3 to 4 are denoted by the same reference numerals to omit redundant description. First, as shown in FIG. 2 and FIG. 1 (A), the gasket 4 is attached to the terminal portion 16b of the flexible printed circuit board 16 at substantially the center of both side edges 16d of the crimped portion (shaded portion) 16e of the gasket 4. A pair of small protrusions 20 each having a substantially mountain shape and having a width W2 smaller than the width W1 are integrally formed.

As a result, as shown in FIG. 1C, the gasket 4 is used to connect the terminal plate 16b to the outer peripheral portion 2a of the chassis 2.
Since the stress can be concentrated on the lower surface 4a of the gasket 4 by the tip end portions 20a of the pair of small projections 20 when pressure-bonded onto the upper surface 2b of the above, these tip portions 20a can be bited into the gasket 4. The gap 21 generated between the gasket 4 and the both side edges 16d of the terminal plate 16b is shown in FIG.
It can be made very small as compared with the conventional gap 18 shown in (C).

Moreover, the gap 21 at the side edges 16d
Is formed over a sufficiently long distance along the outer shape of the pair of small protrusions 20, and the substantially central portion in the lengthwise direction of these gaps 21 is formed along the outer shape of the pair of small 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, the gap 2
Since 1 is very small, dust is very difficult to penetrate.
Moreover, as shown by the arrow b in FIG. 1A, the dust in the outside air must invade while bending in the gap 21 having a long length in the middle, so that the dust is less likely to intrude.
Therefore, it is possible to remarkably improve the degree of sealing of the terminal board 16b portion, which is the drawn-out portion of the flexible printed circuit board 16 drawn out from the inside of the sealed case 1.
It is possible to prevent dust from entering the inside as much as possible.

The above is a description of one embodiment of the present invention.
The present invention is not limited to the above embodiments, 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 disc device that records and reproduces a hard disk, but can be applied to a disc device that records and reproduces various disc-shaped recording media.

[0017]

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

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

The formation of the pair of small protrusions integrally on both side edges of the pressure-bonded portion of the flexible printed circuit board by the gasket may be achieved simply by changing the shape of the die for pressing the flexible printed circuit board. It is very simple and there is no increase in cost due to the formation of the pair of small protrusions.

[Brief description of drawings]

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 views 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 circuit board according to the present invention is applied.

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

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

[Explanation of symbols]

 1 sealed case 2 chassis 2a outer peripheral part of chassis 2b upper surface of outer peripheral part of chassis 3 top cover 3a outer peripheral part of top cover 3b lower surface of outer peripheral part of top cover 4 gasket 4a lower surface of gasket 6 screw 10 hard disk (disk recording medium) 11 Pickup Device 16 Flexible Printed Circuit Board 16b Flexible Printed Circuit Board Terminal Board 16d Both Side Edges of Flexible Printed Circuit Board Terminal Board 16e Crimped Part of Flexible Printed Circuit Board Terminal Plate 20 Small Protrusion 20a Small Projection Tip 21 Gap W1 Guycket Width W2 Width of small protrusion

Claims (1)

[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 housed in the sealed case and a pickup device for the same, and from the inside of the sealed case. A disk device provided with a flexible printed circuit board for inputting / outputting signals to / from the pickup device, which is pulled out to the outside and pressure-bonded between the gasket and the chassis or the top cover, wherein the gasket of the flexible printed circuit board is used. A disk device characterized in that a pair of protrusions having a width smaller than that of the gasket are integrally formed on both side edges of the crimping portion.