JP4680580B2 - Case for magnetic disk device and magnetic disk device - Google Patents

Description

  The present invention relates to a magnetic disk device case for storing a magnetic disk on which data is recorded and a drive device for driving the magnetic disk, and a magnetic disk device provided with the magnetic disk device case.

  A hard disk drive (HDD) is a unit in which a hard disk (magnetic disk) and a drive (driving device) for driving the hard disk are unitized, and the hard disk and the drive are respectively housed in a box-shaped case. .

  The conventional case has a structure in which a cover is placed on a base on which a hard disk, a drive or the like is placed, and is formed in a box shape, and a gasket is interposed between the joint between the base and the cover in order to improve sealing performance. Yes. Generally, a cover is formed by pressing a thin metal material, and the cover and the base are joined by fastening edges (at least four corners) with fastening means such as screws. The gasket is made of an elastic material such as silicon rubber, and is formed in an annular shape along the joint between the base and the cover (see, for example, Patent Documents 1 and 2).

In view of difficulty in assembling a gasket such as a rubber band whose shape is difficult to determine, a gasket with improved rigidity has been proposed. This gasket is composed of an annular core material made of a thin metal plate and the like, and an elastic material that is in contact with and integrated with both surfaces of the core material, and the rigidity of the gasket is enhanced by the core material. Accordingly, the gasket can be held in a predetermined shape, and the gasket can be easily arranged and assembled before assembly (see, for example, Patent Document 3).
JP 2004-111037 A JP 2004-52868 A JP-A-4-341986

  However, in the case of the conventional HDD described above, the edge of the cover using a thin metal material is attached to the base with a plurality of screws or the like with a gasket made of an elastic material interposed between the cover and the base. When tightened, in the vicinity of the middle between the screws, there is a problem that the gasket is not sufficiently compressed due to the repulsive force of the gasket and the cover is warped. The warpage of the cover causes an error in the height dimension of the HDD, and the gasket is not sufficiently compressed, resulting in a decrease in the sealing performance in the case. Even if the above-described gasket with increased rigidity is used, the cover edge portion does not increase in rigidity, and thus warpage of the cover cannot be suppressed.

  There is also a method to suppress the warpage of the cover by increasing the thickness of the cover, but generally a small and thin cover is formed with a press, and it is difficult to thicken only the edge of the cover. Increasing the thickness of the cover without changing the height dimension reduces the height dimension of the internal space of the case. On the other hand, if the height dimension of the internal space of the case is maintained as before, the height of the HDD (case outline) is increased. The dimension becomes high. Although the cover edge can be bent in a U shape to increase the thickness of the cover edge, there is a risk of breakage at the bent part and fine adjustment of the edge thickness cannot be performed.

Further, if the thickness of the gasket is reduced in order to suppress the warpage of the cover, the whole area of the gasket is not sufficiently compressed due to the joint tolerance of the base, the cover, and the gasket, so that the sealing property of the case cannot be ensured.
In addition, when a low-repulsive force gasket is used to suppress warping of the cover, a small low-repulsive gasket is required when the HDD is a small one having an inch or less. However, at the present stage, there is no small low-rebound gasket that has been put into practical use.
Furthermore, the number of screws can be increased to suppress the warpage of the cover, but the labor during the HDD assembling process is increased and productivity is impaired.

  The present invention takes the above-described conventional problems into consideration, and does not change the height of the magnetic disk device and the internal space of the case, and also warps the cover without impairing the sealing performance and productivity of the case. It is an object of the present invention to provide a magnetic disk device case and a magnetic disk device capable of suppressing the above-mentioned problem.

  According to the first aspect of the present invention, there is provided a base on which a magnetic disk, a driving device, or the like is mounted, a cover that covers the base, a fastening means that fastens joint portions between the base and the cover, and a space between the joint portions. In the magnetic disk device case provided with an interposed gasket, the cover is formed along the joint portion at least one of the cover and the gasket or at the outer side of the cover. A reinforcing member for increasing the rigidity of the joint is provided.

  According to a second aspect of the present invention, in the case for a magnetic disk device according to the first aspect, the reinforcing member is formed in a shape including a fastening position by the fastening means.

  According to a third aspect of the present invention, in the magnetic disk device case according to the first or second aspect, the cover and the reinforcing member are integrally joined.

  According to a fourth aspect of the present invention, there is provided a magnetic disk device case according to any one of the first to third aspects, a magnetic disk housed in the case, and a drive device housed in the case and driving the magnetic disk. It is characterized by being provided.

According to the magnetic disk device case of the first aspect, the reinforcing member formed along the joint is provided between the cover and the gasket or at least one of the outside of the cover. The rigidity of the joint portion of the cover is increased by the member, and the warpage of the cover can be suppressed. Thereby, the height dimension error of the case outer shape due to the warp of the cover can be eliminated, the gasket can be sufficiently compressed over the entire region, and the sealing performance in the case can be ensured.
Further, since the thickness of the cover itself does not change, it is possible to suppress the warpage of the cover without reducing the height dimension of the internal space of the case or increasing the external dimension of the case. Further, since it is not necessary to make the gasket thin, there is no problem of LEAK (sealing performance) of the case, and further, since it is not necessary to add a fastening means, productivity can be maintained.

  In the magnetic disk device case according to claim 2, since the reinforcing member is formed in a shape including the fastening position by the fastening means, the effect of improving the cover rigidity by the reinforcing member is increased, and the thinner reinforcing member Can suppress the warping of the cover.

  According to the magnetic disk device case of the third aspect, since the cover and the reinforcing member are integrally joined, the cover or the reinforcing member is prevented from being lifted, and the effect of improving the cover rigidity by the reinforcing member is increased. Can do.

  According to the magnetic disk device of the fourth aspect, the magnetic disk device case described above, the magnetic disk housed in the case, and the drive device housed in the case and driving the magnetic disk are provided. Therefore, the height dimension error of the magnetic disk device due to the warp of the cover can be eliminated, and the gasket can be sufficiently compressed over the entire area, and the sealing performance of the magnetic disk device can be ensured.

  Embodiments of a magnetic disk device case and a magnetic disk device according to the present invention will be described below with reference to the drawings.

  As shown in FIG. 1, a case 1 for a magnetic disk device includes a base 2 having a recess 7 formed in the center, a cover 3 that covers the base 2, a joint 8 of the base 2, and a joint 9 of the cover 3. Are composed of a screw 4 (fastening means) 4, a gasket 5 interposed between the joint portions 8 and 9, and a reinforcing plate (reinforcing member) 6 that increases the rigidity of the joint portion 9 of the cover 3.

  The base 2 is formed in a dish shape by pressing a thin metal plate. In the center, a recess 7 on which a magnetic disk and a driving device (not shown) are respectively mounted is formed. Is formed with a bowl-shaped joint 8. A circular opening 10 is formed in the bottom surface of the recess 7, and a motor for rotating a magnetic disk (not shown) is fitted into the opening 10. Further, screw holes 11 into which the screws 4 are screwed are formed at the four corners of the joint portion 8 respectively.

  Like the base 2, the cover 3 is formed by pressing a thin metal plate into a dish shape, and a dent 12 facing the dent 7 of the base 2 is formed at the center. At the edge portion, a bowl-shaped joint portion 9 that faces the joint portion 8 of the base 2 is formed. Screw holes 13 through which the screws 4 are inserted are formed at the four corners of the joint 9.

  The gasket 5 is a thin plate material made of an elastic material such as rubber or plastic, and is formed in an annular shape along the inner edges of the joint portions 8 and 9 formed in an annular shape. The gasket 5 may only be sandwiched between the joint portion 8 of the base 2 and the reinforcing plate 6, but may be attached to the joint portion 8 or the reinforcing plate 6 of the base 2 with an adhesive or the like. The gasket 5 is formed in a shape that avoids the fastening position by the screw 4, and notches 15 are formed at the four corners of the gasket 5.

  The reinforcing plate 6 is continuously formed along the outer edge of the joint 9 of the cover 3 and has an annular shape. The reinforcing plate 6 is provided between the joint portion 9 of the cover 3 and the gasket 5, and is formed to have substantially the same width as the contact surface of the gasket 5. As a result, the rigidity of the portion of the cover that holds the gasket 5 is increased. The reinforcing plate 6 is provided so as to be in direct contact with the joint portion 9 of the cover 3. The reinforcing plate 6 is joined to the joint portion 9 of the cover 3 by laser welding, and the reinforcing plate 6 and the cover 3 are integrated. Has been. Further, the reinforcing plate 6 is formed in a shape including a fastening position by the screw 4, and a screw hole 14 through which the screw 4 is inserted is formed in a corner portion of the reinforcing plate 6.

  The reinforcing plate 6 has a symmetrical shape in order to prevent misdirection during assembly, and the inner edge shape of the reinforcing plate 6 is different from the inner edge shape of the gasket 5. The inner edge shape of the reinforcing plate 6 may be the same as the inner edge shape of the gasket 5, that is, the shape of the reinforcing plate 6 may be the same shape as the joint portions 8 and 9.

  In the magnetic disk device case 1 having the above-described configuration, a magnetic disk (not shown) and a driving device for driving the magnetic disk are housed, respectively. The device is configured.

  A procedure for assembling a magnetic disk device using the magnetic disk device case 1 having the above-described configuration will be described.

First, a process of placing a magnetic disk (not shown) and a magnetic disk in the recess 7 of the base 2 is performed.
Next, the screw hole 13 of the cover 3 and the screw hole 14 of the reinforcing plate 6 are aligned, the reinforcing plate 6 and the cover 3 are overlapped, and the joint 9 of the cover 3 and the reinforcing plate 6 are laser welded. The step of welding is performed.

Next, the gasket 5 is bonded to the base side (lower side in FIG. 1) joint surface of the reinforcing plate 6 with an adhesive, and the reinforcing plate 6 and the gasket 5 that are integrally provided are interposed to cover the cover 3. The step of placing the joint portion 9 on the joint portion 8 of the base 2 is performed. At this time, the screw hole 14 of the reinforcing plate 6 and the screw hole 11 of the base 2 are aligned. Alternatively, an adhesive may be applied to the joint surface of the gasket 5 on the base 2 side to bond the joint portion 8 of the base 2 and the gasket 5 together.
Finally, a process of screwing the screws 4 into the screw holes 11, 13, 14 and fastening the four corners with the screws 4 is performed.

  According to the magnetic disk device case 1 configured as described above, the reinforcing plate 6 formed along the joints 8 and 9 is provided between the cover 3 and the gasket 5. The rigidity of the joint portion 9 of the cover 3 increases, and the warpage of the cover 3 can be suppressed. Thereby, the error of the outer height of the magnetic disk device case 1 due to the warping of the cover 3 can be eliminated, and the gasket 5 can be sufficiently compressed over the entire area. The magnetic disk device case 1 The inside sealing performance can be secured.

  Further, since the thickness of the cover 3 itself does not change, the warp of the cover 3 is not reduced without reducing the height of the internal space of the magnetic disk device case 1 or increasing the outer dimension of the magnetic disk device case 1. Can be suppressed. Further, since it is not necessary to make the gasket 5 thin, the problem of LEAK (sealing property) of the magnetic disk device case 1 is eliminated, and further, since it is not necessary to add the screw 4 to the intermediate portion, productivity can be maintained.

  Further, since the reinforcing plate 6 is formed in a shape including the fastening position by the screw 4, the effect of improving the rigidity of the cover 3 by the reinforcing plate 6 is increased, and the warp of the cover 3 can be suppressed by the thinner reinforcing plate 6. it can.

  Further, since the cover 3 and the reinforcing plate 6 are integrally joined, the cover 3 is prevented from being lifted, and the effect of improving the rigidity of the cover 3 by the reinforcing plate 6 can be increased.

  Also, according to the magnetic disk device having the above-described configuration, the above-described magnetic disk device case 1, the magnetic disk housed in the case 1, and the drive device housed in the case 1 for driving the magnetic disk. Therefore, the height dimensional error of the magnetic disk device due to the warping of the cover 3 can be eliminated, and the gasket 5 can be sufficiently compressed over the entire area, thereby improving the sealing performance of the magnetic disk device. Can be secured.

  The embodiments of the magnetic disk device according to the present invention have been described above. However, the present invention is not limited to the above-described embodiments, and can be changed as appropriate without departing from the spirit of the present invention. For example, in the above-described embodiment, the reinforcing plate 6 is provided between the cover 3 and the gasket 5, but in the present invention, a reinforcing member may be provided outside the cover. In this case, the reinforcing member has a shape in which a portion where a fastening member such as a screw is provided is lowered one step so that the head of the fastening member such as a screw head does not become higher than the cover.

Further, in the above-described embodiment, the screw 4 is used as the fastening member, but the present invention may be, for example, a band-shaped member or other fastening mechanism or fastener.
In the above-described embodiment, the reinforcing member (reinforcing plate) 6 and the gasket 5 are frame-plate-shaped, but the present invention may be rod-shaped and is not limited to the shape. Absent.

  In the embodiment described above, the reinforcing plate 6 is joined to the cover 3 by laser welding and integrated. However, in the present invention, the reinforcing member may be bonded to the cover by an adhesive and integrated. When integrating with an adhesive, before covering the cover, a step of adhering the reinforcing member to the cover via the adhesive is performed, and the cover provided with the reinforcing member is covered on the base.

  In the above-described embodiment, the recesses 7 and 12 are formed in the center of the base 2 and the cover 3, and the base 2 and the cover 3 are formed in a dish shape. Either one of the cover flats may have a flat shape, and the shape can be changed as appropriate.

In the above-described embodiment, the screw holes 14 are formed at the four corners of the reinforcing plate 6, respectively. The reinforcing plate 6 is formed in a shape including a fastening position by the screw 4. Further, it may have a shape that avoids the fastening position by the screw 4, or may form a notch portion that avoids the fastening position by the fastening means, such as a gasket.
In the above-described embodiment, the reinforcing plate 6 and the cover 3 are integrated. However, in the present invention, the reinforcing member and the cover may not be integrated.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an exploded perspective view of a magnetic disk device case for explaining an embodiment of the magnetic disk device case and the magnetic disk device according to the present invention.

Explanation of symbols

1 Magnetic disk device case 2 Base 3 Cover 4 Screw (fastening means)
5 Gasket 6 Reinforcement plate (reinforcement member)
8,9 joints

Claims (4)

A base on which a magnetic disk, a drive device, or the like is placed, a cover that covers the base, a fastening unit that fastens the joints between the base and the cover, and a gasket that is interposed between the joints are provided. In the case for a magnetic disk device,
The cover is formed by pressing a thin metal plate,
At least one of the cover and the gasket, or at least one of the outer sides of the cover, is provided with a reinforcing member that is formed along the joint and increases the rigidity of the cover joint .
The case for a magnetic disk device, wherein the reinforcing member has a thin plate shape and is integrated with the cover at a joint portion of the cover by laser welding . The case for a magnetic disk device according to claim 1,
The case for a magnetic disk device, wherein the reinforcing member is formed in a shape including a fastening position by the fastening means. The magnetic disk device case according to claim 1 or 2,
A case for a magnetic disk device, wherein the cover and the reinforcing member are integrally joined. A case for a magnetic disk device according to any one of claims 1 to 3 , a magnetic disk housed in the case, and a drive device housed in the case and driving the magnetic disk. A magnetic disk device characterized by comprising:

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