JP4193851B2 - Storage device - Google Patents

Description

  In particular, the present invention relates to a storage device that can improve the sealing performance of a storage device such as a magnetic disk device or an optical disk device by securely attaching a sealing seal for blocking air in and out of the device.

  In recent years, disk devices such as magnetic disk devices and optical disk devices have been used as computer storage devices. Transmission / reception of signals between the head of the disk device and the control circuit of the disk device is being accelerated, and the storage capacity of the disk device is increasing year by year. When the size of the disk is determined, the storage capacity is improved by increasing the TPI (increasing the number of tracks per inch) by narrowing the pitch of the recording tracks on the disk.

  In particular, in a magnetic disk device, when the TPI increases and the track density increases, the flying height of the head needs to be extremely low in order to improve the recording / reproducing characteristics. Therefore, even a slight amount of dust affects the flying characteristics of the head. Then, the head runs out of control or the head collides with the disk, leading to destruction of the head or the disk or a reduction in processing efficiency of data transfer, and the reliability of the storage device is lowered. Therefore, in a disk device using a disk having a high-density track, it is desired to securely seal the device.

  2. Description of the Related Art Conventionally, in a magnetic disk device, a housing (housing) is configured by a base on which components constituting the magnetic disk device are mounted and a cover that covers the base. And in order to maintain the airtightness inside the apparatus, packing is sandwiched and overlapped at the boundary portion between the base and the cover. Thereafter, the base and the cover are integrated by using a plurality of screws and screwing through the screw hole of the cover and the screw hole of the base.

  The screw hole is provided in a screw groove formed one step down from the cover surface so that the screw head does not protrude. After the screw tightening, a hermetic seal having a size slightly larger than the size of the screw groove is attached to each screw groove so as to cover the groove with the screw hole.

  However, as described above, there is a problem that it is necessary to apply a hermetic seal to a plurality of grooves with screw holes, and it takes a long time because it requires skilled work. In addition, when the hermetic seal is affixed to the surface of the casing, bubbles are likely to be generated between the hermetic seal and the casing surface. Then, there is a possibility that the air left in the bubbles protrudes from the external dimensions of the specification of the apparatus or expands due to a temperature rise to break the hermetic seal. In addition, the bubbles are unsightly in appearance, and there is a problem that assembling costs are required due to the need for special consideration and labor for the work of applying the hermetic seal.

  Therefore, an object of the present invention is to provide a storage device suitable for mass production by improving workability for sealing. It is another object of the present invention to provide a storage device with enhanced sealing performance and improved durability and reliability.

The present invention includes a base on which a mechanism for accessing a storage medium is mounted, a cover that covers the base, a hermetic seal that seals at least one opening of the base and / or the cover, and the opening And at least one member provided with at least one bubble formation preventing hole for preventing the formation of bubbles at the time of sticking the seal on the sticking surface of the hermetic seal away from the sealing position , is a reinforcing plate member, the reinforcing plate member is characterized by comprising provided at a position opposing the front Symbol opening.

Accordingly, the strength of the hermetic seal is reinforced and the formation of bubbles is prevented, thereby improving durability. Can be improved.

The reinforcing plate-like member is a metal plate or a resin film.

Therefore, the reinforcing plate-like member can be easily formed by a pressing technique if it is a metal plate, and if it is made of a resin such as natural rubber or a resin such as synthetic plastic, it can be easily removed by simple die cutting or cutting. It can be formed.

  According to the memory device of the present invention, by providing a hole for preventing air bubble formation (for removing air) on the affixing surface of the hermetic seal, it is possible to prevent the generation of air bubbles at the time of adhering, and the destruction of the airtight due to the expansion of the air bubbles. Can be prevented. And it becomes possible to flatten the surface of a housing reliably. Therefore, since the durability of the hermetic seal can be improved, the internal environment of the device can be maintained for a long time, and the durability and reliability of the storage device can be improved.

  Embodiments of the present invention will be described in detail below with reference to the accompanying drawings as a magnetic disk device as an example of a storage device.

  FIG. 1 is an exploded perspective view of a magnetic disk apparatus according to a first embodiment of the present invention. 2A is an overall perspective view of the magnetic disk device of FIG. 1, and FIG. 2B is a longitudinal sectional view of the magnetic disk device of FIG.

  A housing (housing) is composed of a base 1 on which components constituting the magnetic disk device are mounted and a cover 7 covering the base 1. The base 1 uses a deep bathtub type to secure storage space.

  Inside the base 1, there is a spindle motor 3 that rotationally drives ten disks 2 at about 6000 rpm, and an actuator that holds a suspension that mounts a head 6 for writing signals to the disks 2 and reading signals from the disks 2. The arm 5 and the voice coil motor 4 composed of a coil part 4a and a magnetic circuit part 4b for driving the actuator arm 5 are accommodated.

  As shown in FIG. 1, the cover 7 has a plurality of grooves 8A formed by pressing a single thin plate, and a screw hole is formed at the center so that screws 8B, 3C, and 5B can pass therethrough.

  Further, the upper part of the spindle motor 3 and the upper part of the shaft 5A of the actuator arm 5 have a height higher than that of the other base-mounted components, and the housing 7 is housed in the housing 7 by facing the protruding surface 7A of the cover 7, respectively. Space is secured. Further, screw holes are formed in the shaft 3B of the spindle motor 3 and the shaft 5A of the actuator arm 5, and are screwed into the screw holes of the groove 8A of the cover 7 by the respective screws 3C and 5B.

  The periphery of the protruding portion 7A is a stepped surface 7B, on which a damping plate 10 made of a rolled steel plate is attached with an adhesive or a pressure-sensitive adhesive via a VEM (vibration absorber). The damping plate 10 is formed in a shape that covers the periphery of the upper part of the shaft of the spindle 3 or the actuator 5, and prevents vibration of the spindle 3 or the actuator 5, thereby preventing the generation of vibration noise. I play.

  The cover 7 is formed so as to be fitted to the inner peripheral surface of the base 1. And it attaches to the wall part 1E which has the attachment surface provided with the level | step difference more than the thickness of the cover 7 rather than the upper surface 1A of the base 1. FIG. That is, the outer shape of the cover 7 is smaller than the inner shape of the base 1, and when the cover 7 is attached to the base 1, the upper surface 1A of the base 1 is as shown in FIG. It will be exposed without being blocked by overlapping the cover 7.

  In the state where the cover 7 is attached to the base 1, the upper end surface of the cover 7 does not protrude above the upper end surface 1 A of the base 1 as shown in FIG. It has become. Further, the thickness of the stepped surface 7B of the cover and the damping plate 10 is taken into consideration so that the upper end surface of the damping plate 10 does not protrude from the upper end surface 1A of the base 1 and is substantially the same height. .

  Accordingly, it is considered that the hermetic seal 41 can be easily attached to improve workability, and the formation of bubbles due to a step and the damage of the hermetic seal can be prevented. Further, as described above, since the screw fastening surface around the screw hole is provided lower than the surfaces of the projecting surfaces 7A and 7C, the screw head does not project from the surfaces of the projecting surfaces 7A and 7C and It is considered not to protrude upward from the end face 1A. However, it is also possible to use a countersunk screw without providing a screw hole groove in the cover. In this case, the countersunk screw has a flat head in the form of a flat plate, so that there is almost no protruding amount. Therefore, it is possible to seal the screw by applying a hermetic seal from above the screw head.

  Further, a portion of the bottom surface of the base 1 that faces the flange 3A of the spindle motor 3 protrudes outward, and the protruding portion and a part of the flange 3A are fastened by a screw 3C, and the other end is as described above. The shaft 3B and the cover 7 are fastened and fixed by screws. Therefore, the spindle motor 3 is supported by both the base 1 and the cover 7, and is configured to reduce the vibration of the spindle motor.

  On the bottom surface of the base 1, an opening 48 into which a connector for guiding the flexible printed sheet 47 for guiding signals to the head 6 to the outside of the housing is fitted is formed. The connector is connected to a connector on a printed circuit board 49 on which circuits for servo control, signal processing and the like provided on the outer surface of the base 1 are mounted.

  After housing the main parts and the like described above in the housing, the cover 7 to which the damping plate 10 is attached is fitted into the base 1 and screwed, and then a hermetic seal 41 is attached.

  The hermetic seal 41 is formed of a single sheet that covers the surface of the cover 7 completely and does not allow outside air to pass through at least a part of the upper surface 1A of the base 1, and in particular, the fitting of the base 1 and the cover 7 ( Paste them together to completely close the gap.

  Note that the seal 41 can be substantially the same size as the upper surface of the housing, depending on the usage of the device and the regulation of the external size. Further, by making the size of the hermetic seal 41 larger than the upper surface of the housing and folding it back on the side surface of the housing, the sticking workability of the seal can be improved. With this configuration, it is possible to secure the sealing by securing a seal sticking area at the boundary between the cover and the base.

  Further, the hermetic seal 41 is made slightly smaller than the upper surface of the housing so that the seal does not protrude from the outer peripheral surface of the housing. Therefore, it can be prevented that the end face of the hermetic seal protrudes from the specified size, and dust or air enters or is peeled off when incorporated in a personal computer such as a desktop or laptop, and the hermetic seal is broken. Further, it is possible to perform the pasting work without worrying about the protruding end face of the hermetic seal, and the workability can be improved.

  Therefore, by using such a large-sized hermetic seal, it is possible to cover all the grooves 8A of the cover 7 and completely prevent the outside air from flowing into the housing through the screw holes of the grooves 8A. Yes. In addition, it is possible to improve the workability by performing the sticking operation only once.

  Similarly, when a component is exposed from the bottom surface of the base 1, it is necessary to apply a hermetic seal to block the inflow of outside air. In FIG. 2B, the spindle 3 is fixed to the base 1 with a screw 3E and a hermetic seal 3D is attached, and the actuator is fixed to the base 1 with a screw 5B and a hermetic seal 5C is attached.

  Here, the sealing seals 3D and 5C are of a size that covers the periphery of the sealing position, but it is also possible to improve workability by using a sealing seal that covers the entire bottom surface of the base. It is.

  The hermetic seals 41, 3D, and 5C are coated on the entire surface with an adhesive or an adhesive so as to be in close contact with the surface of the housing and prevent outside air from passing therethrough. The hermetic seal 41 is made of a material that does not allow outside air to pass through. Here, an aluminum vapor-deposited product of a polyester film is used in consideration of strength, corrosion resistance, and durability.

  It is also possible to use a copper seal as a countermeasure against noise inside and outside the device.

  FIG. 3A is a perspective view showing a state in which the hermetic seal of the second embodiment is pasted, and FIG. 3B is a diagram showing the hermetic seal 51 of the second embodiment. Since the hermetic seal 41 described with reference to FIGS. 1 and 2A and 2B is composed of a single sheet of a size that substantially covers the upper surface of the housing, bubbles may be formed during the pasting operation. . Such bubbles protrude from the prescribed outer dimensions of the device, and when the device is built in the main body device, the hermetic seal may be damaged and the hermetic seal may be broken. In addition, the air left in the bubbles may expand due to an increase in the environmental temperature, and the hermetic seal may be damaged and the hermetic seal may be destroyed.

  It is desired that a hermetic seal be securely attached to the apparatus without generating such bubbles. Therefore, by providing at least one air vent hole in the hermetic seal at a location sufficiently away from the part to be sealed, when the hermetic seal is pressed against the pasting surface during the pasting operation, Air escapes and bubbles can be prevented from forming.

  3 (a) and 3 (b) show a cross-shaped air vent in the hermetic seal 41 of FIG. 1 HYPERLINK "http://webpat.lip.fujitsu.com/patimage/fp/az/fpazea3a.tif". A hermetic seal 51 forming 51H is shown. Since the configuration of this embodiment is the same as that of FIG. 1 except for the hermetic seal 51, the description thereof is omitted.

  In the present embodiment, at least one or more through-holes 51H for venting air are provided with a size of about 2 to 3 mm, and the tensile strength and durability of the hermetic seal 51 are set so that the gap between the holes is not torn during pasting. About 1 mm or more is taken into consideration.

  Further, the air vent through hole may be provided with a large number of small holes as shown in FIG. 3, or the same effect can be obtained by providing a few slightly larger holes.

  Furthermore, it is necessary to be careful when attaching the through hole 51H for venting air so that it is located sufficiently away from the position where it must be sealed so as not to impair the sealing performance of the apparatus. That is, an air vent through hole 51H is provided at a position where the sealing function such as a clearance (fitting) between the base 1 and the cover 7, a screw hole 5B of the spindle, and a screw hole 3B of the actuator is not hindered. It is done.

  In the present embodiment, the sealing seal 51 is affixed to the surface of the housing so that the air vent through hole 51H is located at a position separated by about 1 mm or more from the sealing position. In addition, since characters, symbols or figures such as warnings of the apparatus may be printed on the sealing seal 51, the arrangement of the through holes 51H for removing air is taken into consideration, avoiding the display position 51B of the characters and the like. .

  4 (a) and 4 (b) show a modification of the shape of the air vent through hole 51H in FIG. That is, FIGS. 4A and 4B show the hermetic seal 61 in which the hermetic seal 41 is formed with a substantially circular through hole 61H for air venting. Since the configuration of this embodiment is the same as that of FIG. 1 except for the configuration of the hermetic seal 61, the description thereof is omitted.

  In the present embodiment, at least one or more through holes 61H for air venting having a diameter of about 2 to 3 mm are provided, and the tensile strength and durability of the hermetic seal 51 are taken into consideration so that the distance between the holes is not torn during pasting. About 1 mm or more.

  As in the embodiment of FIG. 3, the air vent through hole 61 </ b> H is a sealed position so as not to hinder the sealing function of the gap 8 </ b> A of the base 1 and the cover 7 and the groove 8 </ b> A of the cover 7. A hermetic seal 61 is affixed to the surface of the housing so as to be at a position about 1 mm or more away from the housing.

  In the present embodiment, a cross-shaped or substantially circular air vent hole is shown, but the same effect can be obtained even if it is formed in a polygonal shape such as a triangle or a star.

  FIG. 5 is an exploded perspective view of the magnetic disk device of the second embodiment in which the cover 7 of FIG. 1 is modified. Since the configuration of this embodiment is the same as that of FIG.

  In this embodiment, the cover 71 is provided with at least one air vent (for preventing bubble formation) hole 71H in the flat surface portion. In the present embodiment, since the air vent hole 71H is provided in the cover 7 having a thickness, the air vent hole 71H can form a recessed hole in addition to the through hole. Moreover, it is possible to form both the through hole and the recessed hole by a pressing technique. However, in order to create a structure that allows air to escape, it is necessary to consider a complicated hole structure in the surface direction in the case of the recessed hole, but the through hole can be easily created simply by penetrating in the thickness direction, and sufficient effects are expected. it can.

  The number and size of the air vent holes 71H are determined in consideration of the rigidity and the earthquake resistance of the cover 7 because the air vent holes 71H are provided in the cover 7 unlike the above-described embodiment. Therefore, especially in the vicinity of the spindle 3 and the actuator 5 which are the sources of vibration, the air vent holes 71H are reduced so as not to impair the rigidity.

  And, like the embodiment of FIG. 1, the hermetic seal 41 is composed of a single sheet that completely covers the surface of the cover 7 and does not allow outside air to pass therethrough and covers at least a part of the upper surface 1A of the base 1. In particular, the base 1 and the cover 7 are pasted so as to completely close the gap, which is a fit (boundary) between the base 1 and the cover 7, the screw hole of the groove 8A, and the air vent hole 71H.

  In this embodiment, an example in which no damping plate is provided is shown. However, a damping plate can be provided in the same manner as in FIG. 1, and the air vent hole may be provided on the surface of the cover excluding the damping plate. As described later, an air vent hole may be provided in the vibration control plate, and an air vent hole may be provided in both the cover and the vibration control plate.

  FIG. 6 is an exploded perspective view of the magnetic disk device of the third embodiment in which the vibration control plate 100 of FIG. 1 is provided with a vibration control plate 100 having an air vent hole 100H. Since the configuration of the present embodiment is the same as that of FIG. 1 except for the damping plate 100, description thereof is omitted.

  In the present embodiment, since most of the surface opposed to the hermetic seal 41 is the damping plate 100, the damping plate 100 itself is provided with an air vent hole 100H by a pressing technique. Therefore, since the damping plate 100 has the air vent hole 100H, it is not necessary to provide a hole in the cover 7 as in the embodiment of FIG. 5, and the sealing property and rigidity of the cover 7 are not impaired. Also, the air vent hole 100H can be formed in the through hole or groove as described above. In the present embodiment, the air vent hole 100H employs a through hole.

  1 and the embodiment, the hermetic seal 41 is configured by a single sheet that completely covers the surface of the cover 7 and does not allow outside air to pass therethrough and covers at least a part of the upper surface 1A of the base 1. In particular, the base 1 and the cover 7 are pasted so as to completely close the gap, the screw hole of the groove 8A, and the hole 100H for air venting so that there is no inflow of air.

  The shape of the damping plate and the shape of the air vent hole can be variously modified, such as a substantially circular shape, a polygonal shape, and a cross shape, and are not limited to the present embodiment.

  In addition, the assembling process is such that air is released from the plurality of holes 100H without adhering the central part of the vibration control plate, or air is released inside the apparatus by providing a hole on the cover side facing the vibration control plate. In this case, the air vent hole 100H can sufficiently function when the hermetic seal is attached.

  The embodiment has been described above in which a hermetic seal is applied over the entire upper surface of the housing. In other words, when a hermetic seal is pasted over a certain large area, if a hole for air venting is provided on the hermetic seal or its pasting surface, bubbles are not generated and there is an effect that it can be pasted neatly and flatly. I have explained. Of course, it is needless to say that even a hermetic seal much smaller than the cover is applicable depending on the pasting area.

  Therefore, in the embodiment described below, an example in which the above concept is applied to a hermetic seal that is sufficiently smaller than the area of the cover is shown.

  FIG. 7 is an exploded perspective view of the magnetic disk apparatus of the fourth embodiment. Since the outline of the components constituting the magnetic disk device is the same as that shown in FIG. 1, detailed description thereof is omitted.

  The five disks 26 are mounted on the spindle motor 24 and are driven to rotate at about 6000 rpm. Therefore, in order to reduce the vibration of the spindle motor 24, one end of the spindle 24 is press-fitted and fixed to the base, and the other end is provided with a screw hole 24A in the shaft, and is fastened and fixed with the screw 42B through the screw hole 42B of the cover 42. The spindle motor 24 is supported at both ends.

  A head 33 for recording / reproducing data from / to the disk 26 is held at one end of a suspension 46 and is urged to be pressed against the disk 26 when the rotation of the disk is stopped, and contact start / stop (CSS) on the disk surface. Stop in the area. When the disk is driven to rotate, a negative pressure is generated on the air bearing surface of the head 33 due to the air flow caused by the rotation, and the head 33 floats on the disk surface.

  The actuator arm 45 is configured to be able to move the head 33 to a target track in the radial direction of the disk 26. A magnetic circuit 45A composed of a magnet and a yoke is provided, a coil 45B is provided at one end of the actuator arm 45, and the coil 45B is disposed so as to face the magnetic circuit 45A. Both of them constitute a voice coil motor, and the actuator arm 45 is driven to move in the radial direction of the disk. Further, in order to reduce the vibration of the actuator arm 45, not only the shaft is fixed to the base 43 but also a screw hole 45A is provided and fastened and fixed by a screw 42A through the cover 42 and the screw hole 42B.

  The other end of the flexible print sheet 37 is connected to a printed circuit board 69 outside the base 43 via a connector 37 </ b> A provided on the base 43.

  The base 43 forms a sealed structure by screwing the screw hole 42B of the cover 42 and the screw hole 43E provided in the base 43 using a plurality of screws 42A through packing (not shown). .

  Furthermore, a sealing seal 42C that is slightly larger than the size of each screw hole is affixed after screw tightening. Of course, it is also possible to cover the entire surface of the cover by using the single sheet hermetic seal described in the above embodiment.

  Accordingly, all the air opening / closing openings provided for adjusting the atmospheric pressure inside the apparatus except the breathing hole 29 having a filter (not shown) are closed with a hermetic seal.

  In this way, the inside of the disk device is designed to have a perfect sealed structure in order to prevent the inflow of air from outside, that is, the inflow of dust.

  Here, FIG. 7 shows a large opening 52 in a part of the cover 7. In this embodiment, an opening 52 is provided at the position of the cover 42 facing the yoke of the magnetic circuit of the voice coil motor 4. This is because the thickness of the cover 42 can be utilized by disposing the yoke inside the opening 52, and the overall height of the apparatus from the base to the end of the cover is reduced. Therefore, the large opening 52 needs to be sealed.

  However, if the large opening 52 is simply covered with a hermetic seal, the hermetic seal itself is not strong enough, and the hermetic seal may be broken by a slight impact.

  Therefore, in this embodiment, the reinforcing intermediate member 65 is attached to the hermetic seal 66 so that the opening 52 is completely covered. Therefore, the strength of the hermetic seal 66 can be increased, and the durability can be improved. The reinforcing intermediate member 65 may be a thin metal plate such as an aluminum alloy or a resin plate such as a plastic, mylar film, or rubber.

  In the present embodiment, the reinforcing intermediate member 65 is provided with an air vent hole 65H. Therefore, when the hermetic seal 66 and the reinforcing intermediate member are pasted, if the hermetic seal is pressed against the pasting surface, air can be prevented from escaping and bubbles can be prevented, and the pasting can be performed neatly and flatly. Can do.

  On the contrary, the same effect can be obtained by providing an air vent hole in the sealing seal 66 without providing an air vent hole in the reinforcing intermediate member 65. At that time, it is necessary to provide the air vent hole while avoiding the print position 67 for displaying characters, symbols, figures and the like.

  Therefore, the concept of the present application can be used not only for sealing a seal that covers almost the entire upper surface of the housing, but also for attaching a seal with an area size that is slightly larger than the size that requires sealing. Further, in addition to the screw hole and the boundary between the cover and the base, the air vent hole, which is the concept of the present application, can be applied to the hermetic seal and the affixing surface for hermetically sealing the actuator and spindle mounting locations.

  Needless to say, air venting holes can be provided not only on either the hermetic seal or the affixing surface, but also on both.

  Furthermore, it goes without saying that the air vent hole needs not to face the opening communicating with the inside of the apparatus.

  As described above, the present invention can improve the workability for sealing and provide a storage device suitable for mass production. In addition, it is possible to provide a storage device with enhanced sealing performance and improved durability and reliability.

1 is an exploded perspective view of a magnetic disk device according to a first embodiment. 2A is an overall perspective view of the magnetic disk device of FIG.

(B) It is sectional drawing of a longitudinal direction.
(A) It is a perspective view of the magnetic disc apparatus using the hermetic seal of the second embodiment.

(B) It is a figure which shows the airtight seal | sticker of 2nd Example.
(A) It is a perspective view of the magnetic disc apparatus using the hermetic seal of the third embodiment.

(B) It is a figure which shows the airtight seal | sticker of 3rd Example.
It is a disassembled perspective view of the magnetic disk apparatus of the second embodiment. It is a disassembled perspective view of the magnetic disk apparatus of the third embodiment. It is a disassembled perspective view of the magnetic disk apparatus of 4th Example.

Explanation of symbols

1, 43 Base 2, 26 Disk 6, 33 Head 7, 71, 42 Cover 8A, 42B Groove 10, 100 Damping plate 41, 51, 61 Sealing seal 51H, 61H Air venting holes 65H, 71A, 100H Air vent hole (Bubble prevention hole)
65 Intermediate member for reinforcement 66, 42C Hermetic seal

Claims (2)

A base equipped with a mechanism for accessing a storage medium;
A cover covering the base;
A hermetic seal that seals at least one or more openings in the base or / and the cover;
At least one member provided with at least one bubble formation preventing hole for preventing the formation of bubbles at the time of sticking a seal on the sticking surface of the hermetic seal away from the sealing position of the opening; ,
Storage device wherein the member is a reinforcing plate member, the reinforcing plate member, characterized by comprising Te set eclipsed in a position opposed to the opening. 2. The reinforcing plate-like member is a metal plate or a resin film. Storage device.

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