JP2011123953A - Disk device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a disk device which controls vibrations caused by outside sounds and prevents the performance of the device from degrading. <P>SOLUTION: The disk device includes: a top cover 14 of a case 10 which stores a disk recording medium 16; a driver which rotates the recording medium; a head 17 which causes the recording medium to process information; a flexible printed circuit board (FPC) 21b which is electrically connected to the head; an opening 50 of the top cover, which is arranged at the section facing to the flexible printed circuit board (FPC); and an opening closure 56 which is an additional member to the top cover and is configured to close the opening of the top cover. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a disk device provided with a disk-shaped recording medium.

In recent years, disk devices such as magnetic disk devices and optical disk devices have been widely used as external recording devices and image recording devices for computers.
2. Description of the Related Art Generally, a magnetic disk device, for example, a hard disk drive (hereinafter referred to as an HDD) includes a sealed housing having a base and a top cover. Arranged in this housing are a magnetic disk, a spindle motor that rotates the magnetic disk, a magnetic head that reads / writes data from / to the magnetic disk, a carriage assembly that supports the magnetic head, a voice coil motor, a substrate unit, and the like. ing. The board unit is electrically connected to the magnetic head by a flexible printed circuit board (hereinafter referred to as FPC) extending from the board unit to the carriage assembly.

In the magnetic disk device as described above, vibration is generated mainly by the rotation of the spindle motor during seek and the magnetic head seek operation by the actuator as the main vibration source. Since this vibration is also propagated to the top cover, the top cover emits noise. In order to suppress the vibration of the top cover due to the operation of the spindle motor or the actuator, a disk device is provided with a recess in the top cover, and a vibration isolating plate is attached to the recess through a viscoelastic material. Proposed (for example, Patent Document 1)
In addition, a disk device has been proposed in which an opening is formed in a position facing the voice coil motor in the top cover, a damper is fixed to the voice coil motor in the opening, and the opening is closed with a damping member (for example, Patent Document 2).

JP 2002-298567 A JP 2004-178777 A

On the other hand, it has been confirmed that the performance of the disk device is degraded when it receives a large external sound. It can be considered that the vibration due to the sound from the outside vibrates the top cover, which propagates the air in the disk device and vibrates the magnetic head and the FPC that transmits the signal from the magnetic head to the substrate unit. In the disk device described above, the suppression of the vibration of the top cover caused by such external sound is not taken into consideration.
In addition, the area on the magnetic head or the area on the FPC is a portion having no sufficient internal clearance, and it is difficult to provide a recess as in Patent Document 1 described above.

  The present invention has been made in view of the above points, and an object of the present invention is to provide a disk device that suppresses vibration caused by external sound and suppresses performance degradation.

  To achieve the above object, a disc device according to an aspect of the present invention performs information processing on a top cover of a housing that accommodates a disc-shaped recording medium, a drive unit that rotates the recording medium, and the recording medium. A flexible printed circuit board (FPC) electrically connected to the head, an opening provided at a position of the top cover facing the flexible printed circuit board (FPC), and the top cover And an opening closing portion configured to close the opening of the top cover.

  A disk device according to another aspect of the present invention includes a top cover of a housing that accommodates a disk-shaped recording medium, a drive unit that rotates the recording medium, and a head that causes the recording medium to perform information processing. A flexible printed circuit board (FPC) that is electrically connected to the head, an opening provided at a position of the top cover facing the moving area of the head, and the top cover are configured separately. An opening closing portion configured to close the opening portion of the top cover.

  According to the above configuration, it is possible to provide a disk device in which performance is not easily lowered due to external loud sound.

FIG. 1 is a perspective view showing an HDD according to a first embodiment of the present invention. FIG. 2 is an exploded perspective view showing the HDD with its top cover removed. FIG. 3 is an exploded perspective view showing the top cover and the plate. FIG. 4 is a plan view of the HDD. FIG. 5 is a cross-sectional view of the top cover along line AA in FIG. 2. FIG. 6 is a diagram showing a result of measuring and comparing the data reading ability in the initial state and under loud sound for the HDD according to the present embodiment and the HDD according to the comparative example. FIG. 7 is a cross-sectional view showing a top cover of an HDD according to another embodiment of the present invention. FIG. 8 is a plan view showing the HDD according to the second embodiment. FIG. 9 is a plan view showing an HDD according to the third embodiment.

Hereinafter, an HDD according to an embodiment of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a perspective view showing the HDD according to the first embodiment, and FIG. 2 is an exploded perspective view showing the internal structure by removing the top cover of the HDD.

  As shown in FIGS. 1 and 2, the HDD includes a housing 10. The housing 10 includes a rectangular box-shaped base 12 having an open top surface and a rectangular plate-shaped top cover 14. The top cover is screwed to the base 12 by a plurality of screws 15 and closes the upper end opening of the base 12.

  In the base 12, a magnetic disk 16 as a recording medium and a mechanism unit are provided. The mechanism unit supports a spindle motor 18 that supports and rotates the magnetic disk 16, a plurality of magnetic heads 17 that record and reproduce information on the magnetic disk, and supports these magnetic heads 17 movably with respect to the magnetic disk 16. The head actuator 20, the voice coil motor (hereinafter referred to as VCM) 22 that rotates and positions the head actuator, and the magnetic head 17 is held at a position away from the magnetic disk when the magnetic head moves to the outermost periphery of the magnetic disk. When an impact or the like is applied to the ramp load mechanism 24 or the HDD, an inertia latch mechanism 26 that holds the head actuator in the retracted position and a substrate unit 21 on which electronic components such as a preamplifier are mounted are housed.

  A printed circuit board (not shown) that controls the operations of the spindle motor 18, the VCM 22, and the magnetic head 17 via the board unit 21 is screwed to the outer surface of the base 12 and is positioned to face the bottom wall of the base 12. ing.

  The magnetic disk 16 is formed to have a diameter of 65 mm (2.5 inches), for example, and has magnetic recording layers on the upper surface and the lower surface. The magnetic disk 16 is coaxially fitted to a hub (not shown) of the spindle motor 18 and is clamped by a clamp spring 27 to be fixed to the hub. The magnetic disk 16 is driven to rotate at a predetermined speed, for example, 5400 rpm or 7200 rpm, by a spindle motor 18 as a drive unit.

  The head actuator 20 includes a bearing assembly 30 fixed on the bottom wall 12 a of the base 12. The bearing assembly 30 that functions as a bearing portion includes a pivot 32 that is erected on the bottom wall 12a of the base 12 and a cylindrical hub 34 that is rotatably supported on the pivot via a pair of bearings. ing. The head actuator 20 includes two arms 36 attached to the hub 34, two suspensions 38 extending from the respective arms, the magnetic head 17 supported on the extended end of the suspension, and a plurality of spacer rings. ing. Each suspension 38 may be formed integrally with the corresponding arm 36.

  Each magnetic head 17 has a substantially rectangular slider (not shown) and an MR (magnetoresistive) head element for recording / reproduction formed on the slider, and is fixed to a gimbal portion formed at the tip of the suspension 38. ing. Each magnetic head 17 is electrically connected to a main FPC 21b described later via a relay flexible printed circuit board (hereinafter referred to as a relay FPC) (not shown). The relay FPC is formed in an elongated strip shape as a whole, and its distal end is electrically connected to the magnetic head 17 and its base end is electrically connected to the main FPC 21b. Thereby, each magnetic head 17 is electrically connected to the substrate unit 21 via the relay FPC and the main FPC 21b.

  The arms 27 fitted to the outer periphery of the hub 34 are positioned parallel to each other at a predetermined interval, and the suspension 38 and the magnetic head 33 attached to these arms are positioned facing each other.

  The VCM 22 has a support frame (not shown) extending from the hub 34 in the direction opposite to the arm 27, and a voice coil supported by the support frame. When the head actuator 20 is incorporated in the base 12, the voice coil is positioned between a pair of yokes 40 fixed on the base 12, and constitutes the VCM 22 together with these yokes and a magnet (not shown) fixed to one of the yokes. is doing. When the voice coil is energized, the head actuator 20 is rotated, and the magnetic head 17 is moved and positioned on a desired track of the magnetic disk 16.

  The ramp load mechanism 24 includes a ramp 42 provided on the bottom wall 12 a of the base 12 and disposed outside the magnetic disk 16, and a tab (not shown) extending from the tip of each suspension 38. When the head actuator 20 is rotated and the magnetic head 17 is rotated to the retracted position outside the magnetic disk 16, each tab is engaged with the ramp surface formed on the ramp 42, and then the ramp surface is inclined. Be raised. As a result, the magnetic head 17 is unloaded from the magnetic disk 16 and held outside the magnetic disk.

  The board unit 21 has a main body 21 a formed of a flexible printed circuit board, and the main body 21 a is fixed to the bottom wall 12 a of the base 12. Electronic components such as a head amplifier are mounted on the main body 21a. The board unit 21 has a main flexible printed circuit board (main FPC) 21b extending from the main body 21a. The extended end of the main FPC 21 b is connected to the vicinity of the bearing portion 30 of the head actuator 20, and is further electrically connected to the magnetic head 17 via a relay FPC provided on the arm 36 and the suspension 38. A connector (not shown) for connecting the board unit 21 and the printed circuit board is mounted on the bottom surface of the main body 21 a of the board unit 21.

  As shown in FIGS. 1 to 3, the rectangular top cover 14 is formed, for example, by press-molding an aluminum alloy plate, stainless alloy (SPB) or the like having a plate thickness of about 0.25 mm. A first through hole 43 is formed at each of the four corners of the top cover 14 and at substantially the center of the pair of long side edges. The top cover 14 is fastened to the base 12 by screwing the screws 16 inserted through the first through holes 43 into screw holes formed in the peripheral edge portion of the base 12, and closes the upper end opening of the base. The top cover 14 faces the magnetic disk 16 substantially in parallel with a predetermined gap.

  A second through hole 45 is formed in the top cover 14 at a position facing the pivot 32 of the bearing assembly 30. A part of the top cover 14 and the pivot 32 are fastened by screwing the fixing screw 46 inserted through the second through hole 45 into the upper end of the pivot 32. Therefore, both ends of the pivot 32 are supported by the base 12 and the top cover 14 of the housing 10.

  As shown in FIGS. 1 to 4, in the top cover 14, in the region facing the magnetic disk 16, in order to increase the rigidity of the top cover and to suppress the generation of turbulence due to the rotation of the magnetic disk 16. A recess 44 is formed by the diaphragm. The recess 44 is formed in an arc shape or a horseshoe shape having a center substantially concentric with the rotation center of the magnetic disk 16, and is located opposite to the surface of the magnetic disk 16.

  As shown in FIGS. 1 to 5, in the top cover 14, the moving area of the magnetic head 17, that is, the area facing the seek area, the area facing the moving area of the arm 36 and the suspension 38, and the main FPC 21b is opposed. One opening 50 is formed in the region to be processed. In the present embodiment, a recess 52 is formed in the top cover 14, and an opening 50 is formed at the bottom of the recess 52. The recess 52 has a shape similar to the opening 50 and is formed slightly larger than the opening 50.

  A flat plate 56 is attached to the top cover 14 so as to cover the opening 50. The plate 56 functioning as an opening closing portion is formed separately from the top cover, and is formed slightly larger than the opening 50 and slightly smaller than the recess 52. The plate 56 is disposed in the recess 52 and is adhered to the top cover 14, here, the bottom wall of the recess 52 in an airtight manner around the opening 50 with an adhesive 58. Thereby, the plate 56 closes the opening 50 in an airtight manner, is located in the recess 52, and is disposed substantially flush with the outer surface of the top cover 14. The plate 56 is fixed to the top cover without directly contacting the top cover 14 by interposing the adhesive 58.

The plate 56 is formed by selecting specific gravity, thickness, and material so as to have a resonance frequency higher than the resonance frequency of the top cover 14 and as close as possible to the resonance frequency of the top cover 14. The plate 56 is made of, for example, the same metal material as that of the top cover 14, for example, SPB, or is made of a metal material having a specific gravity larger than that of the top cover 14. The plate 56 is not limited to a metal material, and may be formed of a resin material having a specific gravity greater than that of the top cover 14.
As the adhesive 58, various adhesives such as a resin adhesive can be used. It is desirable that the adhesive 58 has elasticity.

  According to the HDD configured as described above, in the top cover 14, the opening 50 is opened in the seek area of the magnetic head and the area facing the main FPC and covered with another plate 56. Since the resonance frequency is different between the top cover 14 having the opening 50 and the plate 56 to be attached, the effect of suppressing mutual resonance can be obtained by fixing them with the adhesive 58. As a result, it is possible to suppress vibration from the outside and keep it from being transmitted to the magnetic head and the main FPC while ensuring the height of the internal space of the housing 10. Accordingly, it is possible to prevent a decrease in capability caused by external air vibration such as a large volume, for example, a decrease in positioning accuracy of the magnetic head 17.

  The vibration damping effect is higher when the weight of the plate 56 is sufficiently heavy relative to the top cover 14. Further, the resonance frequency of the plate 56 is higher than that of the top cover 14, and the vibration suppression effect is higher when the mutual resonance frequencies are closer. By forming the opening 50 in the top cover 14, the resonance frequency of the top cover 14 can be brought close to the resonance frequency of the plate 56. A higher effect can be expected by using a resin material having a damping effect as the adhesive 58 for bonding the top cover 14 and the plate 56.

  FIG. 6 shows a result of comparing the decrease in ability to external sound between the HDD according to the present embodiment and the HDD according to the comparative example. In the HDD according to the comparative example, the top cover has no opening and has a normal opening, and the top cover has an opening. Using three types of plates A, B, and C with different thicknesses and weights as plates, compare the ability when these plates are not attached to the top cover and when the plates are attached to the top cover. ing.

  As shown in FIG. 6, in the “initial” state where there is no sound from the outside, the signal reading ability of each HDD of N0.1 to 5 is 100%. Under loud sound, all normal and plateless HDDs have a signal reading capability of 1% or cannot be read. In an HDD in which the plate A or B is attached to a normal top cover having no opening, the signal reading ability is 3 to 6%. On the other hand, in the case of an HDD in which a plate is attached to a top cover with an opening, the signal reading ability is improved to 5 to 10% in all cases.

  Further, according to the HDD, the top cover has an opening in at least one of the area where the head seeks and the area on the FPC, so the surface for opening the top cover is designed to be low in advance. be able to. Even when a plate is affixed to the top cover, it can be designed not to exceed the device height limit and to be higher than the other surfaces. Furthermore, in this embodiment, the recess 52 is provided in the top cover 14, the opening 50 is formed in the recess, and the plate 56 is provided in the recess so that the plate 56 protrudes from the outer surface of the top cover 14. Absent. Therefore, the portion of the plate 56 does not become a place that is easily pressed from the outside, and the magnetic head and the main FPC are prevented from being pressed.

  In the first embodiment, the top cover 14 is provided with a recess, and the plate 56 is disposed in the recess. However, the top cover 14 is not provided with a recess as shown in FIG. It is good also as a structure which affixes the plate 56 on the outer surface of 14 and covers the opening 50. FIG. Even in such a configuration, the same effects as those of the first embodiment can be obtained. Moreover, the surface which opens the opening 50 of the top cover 14 can be designed low beforehand. Even when a plate is affixed to the top cover, it can be designed not to exceed the device height limit and to be higher than the other surfaces.

Next, an HDD according to another embodiment of the present invention will be described.
FIG. 8 is a plan view showing the HDD according to the second embodiment. As shown in this figure, in the top cover 14, one opening 50 is formed in a region facing the main FPC 21b. A recess 52 is formed in the top cover 14, and an opening 50 is formed at the bottom of the recess 52. The recess 52 has a shape similar to the opening 50 and is formed slightly larger than the opening 50.

  A flat plate 56 is attached to the top cover 14 so as to cover the opening 50. The plate 56 is formed to be slightly larger than the opening 50 and slightly smaller than the recess 52. The plate 56 is disposed in the recess 52 and is adhered to the top cover 14, here, the bottom wall of the recess 52 in an airtight manner with an adhesive around the opening 50. Thereby, the plate 56 closes the opening 50 in an airtight manner, is located in the recess 52, and is disposed substantially flush with the outer surface of the top cover 14. The plate 56 is fixed to the top cover without directly contacting the top cover 14 by interposing an adhesive.

The plate 56 is formed by selecting specific gravity, thickness, and material so as to have a resonance frequency higher than the resonance frequency of the top cover 14 and as close as possible to the resonance frequency of the top cover 14. The plate 56 is made of, for example, the same metal material as that of the top cover 14, for example, SPB, or is made of a metal material having a specific gravity larger than that of the top cover 14. The plate 56 is not limited to a metal material, and may be formed of a resin material having a specific gravity greater than that of the top cover 14. As the adhesive 58, various adhesives such as a resin adhesive can be used. It is desirable that the adhesive 58 has elasticity.
In the second embodiment, the other configuration of the HDD is the same as that of the first embodiment described above, and the same reference numerals are given to the same portions, and detailed description thereof is omitted.

  According to the HDD configured as described above, the plate 56 and the top cover 14 can suppress the vibration caused by the sound from the outside and greatly reduce the vibration transmitted to the main FPC 21b. Thereby, it is possible to prevent the magnetic head positioning accuracy from being lowered and the signal reading ability from being lowered. In addition, also in 2nd Embodiment, the effect similar to 1st Embodiment can be acquired.

  FIG. 9 is a plan view showing an HDD according to the third embodiment. According to the third embodiment, in the top cover 14, one opening 50 is formed in the moving region of the magnetic head 17, that is, the region facing the seek region and the region facing the moving region of the arm 36 and the suspension 38. Has been. In the present embodiment, a recess 52 is formed in the top cover 14, and an opening 50 is formed at the bottom of the recess 52. The recess 52 has a shape similar to the opening 50 and is formed slightly larger than the opening 50.

  A flat plate 56 is attached to the top cover 14 so as to cover the opening 50. The plate 56 is formed to be slightly larger than the opening 50 and slightly smaller than the recess 52. The plate 56 is disposed in the recess 52 and is adhered to the top cover 14, here, the bottom wall of the recess 52 in an airtight manner around the opening 50 with an adhesive 58. Thereby, the plate 56 closes the opening 50 in an airtight manner, is located in the recess 52, and is disposed substantially flush with the outer surface of the top cover 14. The plate 56 is fixed to the top cover without directly contacting the top cover 14 by interposing the adhesive 58.

  The plate 56 is formed by selecting specific gravity, thickness, and material so as to have a resonance frequency higher than the resonance frequency of the top cover 14 and as close as possible to the resonance frequency of the top cover 14. The plate 56 is made of, for example, the same metal material as that of the top cover 14, for example, SPB, or is made of a metal material having a specific gravity larger than that of the top cover 14. The plate 56 is not limited to a metal material, and may be formed of a resin material having a specific gravity greater than that of the top cover 14. As the adhesive 58, various adhesives such as a resin adhesive can be used. It is desirable that the adhesive 58 has elasticity.

In the third embodiment, the other configuration of the HDD is the same as that of the first embodiment described above, and the same parts are denoted by the same reference numerals and detailed description thereof is omitted.
According to the HDD configured as described above, the plate 56 and the top cover 14 can suppress the vibration caused by the sound from the outside, and can greatly reduce the vibration transmitted to the magnetic head 17 and the head actuator 20. . Thereby, it is possible to prevent the magnetic head positioning accuracy from being lowered and the signal reading ability from being lowered. In addition, also in 3rd Embodiment, the effect similar to 1st Embodiment can be acquired.

  The present invention is not limited to the above-described embodiments as they are, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage. In addition, various inventions can be formed by appropriately combining a plurality of constituent elements disclosed in the embodiment. For example, some components may be deleted from all the components shown in the embodiment. Furthermore, constituent elements over different embodiments may be appropriately combined.

  For example, the shape and size of the opening and the plate formed in the top cover are not limited to the above-described embodiments, and can be variously modified as necessary. The plate is not limited to a plate shape, and may have another shape. In the magnetic disk device, the number of magnetic disks and magnetic heads can be increased as necessary, and various sizes of magnetic disks can be selected.

DESCRIPTION OF SYMBOLS 10 ... Housing, 12 ... Base, 12a ... Bottom wall, 12b ... Side wall, 14 ... Top cover,
16 ... magnetic disk, 17 ... magnetic head, 18 ... spindle motor,
20 ... Head actuator, 21 ... Substrate unit, 21b ... Main FPC,
30 ... Bearing, 36 ... Arm, 38 ... Suspension, 50 ... Opening, 52 ... Recess,
56 ... Plate, 58 ... Adhesive

Claims (9)

A top cover of a housing that accommodates a disk-shaped recording medium;
A drive unit for rotating the recording medium;
A head for causing the recording medium to perform information processing;
A flexible printed circuit board (FPC) electrically connected to the head;
An opening provided at a position of the top cover facing the flexible printed circuit board (FPC);
A disk device comprising: an opening closing portion configured separately from the top cover and configured to close the opening of the top cover. A top cover of a housing that accommodates a disk-shaped recording medium;
A drive unit for rotating the recording medium;
A head for causing the recording medium to perform information processing;
A flexible printed circuit board (FPC) electrically connected to the head;
An opening provided in a position of the top cover facing the moving area of the head;
A disk device comprising: an opening closing portion configured separately from the top cover and configured to close the opening of the top cover. A top cover of a housing that accommodates a disk-shaped recording medium;
A drive unit for rotating the recording medium;
A head for causing the recording medium to perform information processing;
A flexible printed circuit board (FPC) electrically connected to the head;
An opening provided at a position of the top cover facing the flexible printed circuit board (FPC) and a position facing the moving area of the head;
A disk device comprising: an opening closing portion configured separately from the top cover and configured to close the opening of the top cover. An actuator for movably supporting the head with respect to the recording medium;
The actuator includes a bearing portion, an arm extending from the bearing portion, and a suspension that supports the head, and an opening of the top cover is opposed to the arm and the suspension. 2. The disk device according to 2 or 3.   The said top cover has a recess, the said opening is formed in the bottom of the said recess, and the said opening obstruction | occlusion part is arrange | positioned in the said recess. 2. The disk device according to item 1.   6. The disk device according to claim 1, wherein the opening blocking portion is attached to the top cover with an adhesive around the opening.   4. The disk device according to claim 1, wherein the opening blocking portion has a resonance frequency higher than that of the top cover. 5.   The disk device according to claim 7, wherein the opening blocking portion is formed in a plate shape using the same material as the top cover or a material having a specific gravity greater than that of the top cover.   The disk device according to claim 7, wherein the opening blocking portion is formed of a resin material having a specific gravity greater than that of the top cover.

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