JP2004079048A - Disk device having cooling structure and casing used for the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a disk device having a cooling structure capable of efficiently diffusing heat from the inside of a disk device such as a magnetic disk device, and a casing used for the same. <P>SOLUTION: This device is provided with a heat transmission area 15 (cooling fin 16) disposed on the inner surface of a housing 1, and an area 18 disposed on the outer surface of the housing 1, to which a cooling member is attached. These areas are set to confront each other, heat transmission efficiency inside the disk device is increased in an area in which the heat transmission area 15 is disposed, and the heat is transmitted to the area 18 which is disposed to confront a backside as its opposite surface and to which the cooling member is attached. Thus, the heat in the device is efficiently diffused to the outside thereof. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a disk device such as a hard disk drive used as a mass storage device of a personal computer, and to a housing structure used in the disk device.
[0002]
[Prior art]
At present, the number of rotations of a motor for rotating a recording medium of a disk device such as a hard disk drive (hereinafter referred to as an HDD) is such that a data transfer speed is 5 MB / s to 20 MB / s and a bus width is 8 bits. It is about 5200 to 5400 rpm. However, when the data transfer speed is 40 MB / s and the bus width is 16 bits, the rotation speed of the motor needs to be higher, and needs to be increased to 7200 to 12000 rpm.
[0003]
As the rotational speed of the motor increases, not only does the amount of heat generated from the stator winding of the motor increase, but also the heat generated from the bearing of the rotating shaft increases, and the thermal expansion of the rotating shaft also increases. Further, the thermal expansion of each component constituting the data writing and reading device is increased, and a writing error and a reading error occur.
[0004]
Further, when the amount of thermal expansion of the rotating shaft increases and the stress generated in the joint between the rotating shaft and the recording medium increases, the vibration generated from the rotating disk increases. If this vibration is detected by the vibration sensor and the vibration amount exceeds the allowable amount, the control circuit of the motor lowers the rotation speed to a level within the vibration allowable range. Therefore, the maximum rotation speed of the motor cannot be utilized, and as a result, there is a problem that the data reading speed is reduced.
[0005]
As a solution to the above-described problem of increasing the temperature of the disk device, particularly the temperature of the housing, the conventional magnetic disk device has a heat radiation mechanism. The magnetic disk drive can radiate heat by radiating air to the entire magnetic disk drive, or by contacting the fixed part or housing fixed part of the magnetic disk drive with the mounted equipment, and radiating heat using the heat conduction from this contact part. is there. For example, Japanese Unexamined Utility Model Publication No. Hei 5-4397 discloses a method in which a heat exchange member is attached to a magnetic disk drive, and heat generated inside is radiated from fins outside the heat exchange member. In Japanese Patent Application Laid-Open No. Hei 9-115279, the housing of the magnetic disk drive main body is brought into contact with the housing of the electronic equipment to which the magnetic disk drive is mounted, and the heat of the magnetic disk drive is radiated through the mounted equipment by heat conduction. That is.
[0006]
However, in recent years, the housing of a notebook personal computer, which is an electronic device on which a magnetic disk device is mounted, is often formed of resin, and the packaging density of a desktop personal computer has also become extremely high due to its miniaturization. ing. In such a magnetic disk device which can be mounted on a personal computer having a high mounting density, the periphery of the magnetic disk device is surrounded by ribs, and since the gap between adjacent components is reduced as much as possible to increase the mounting density, The flow of air in the electronic device housing is reduced. Therefore, cooling by natural convection of the air in the housing of the electronic device is less likely to be expected in the future.
[0007]
In addition, since the housing of the personal computer on which the magnetic disk device is mounted is made of resin, the thermal conductivity of the material is low, and the cooling efficiency of the magnetic disk device mounted inside deteriorates.
[0008]
[Problems to be solved by the invention]
The present invention has been made to solve the above-described problem, and is used for a disk device having a cooling structure capable of efficiently dissipating heat inside a disk device such as a magnetic disk device, and used in the disk device. An object is to provide a housing.
[0009]
[Means for Solving the Problems]
The disk device of the present invention includes a motor for rotating a disk-shaped recording medium, a head for reading data from the recording medium, a circuit board on which a circuit for controlling the motor and the head is mounted, A cooling device, comprising: a housing having an inner surface on which the head is built-in and an outer surface on which the circuit board can be mounted, wherein a cooling device that absorbs heat from the housing and dissipates heat to the outer surface is attached. A mounting area is provided, and a housing provided with a cooling fin at a position on the inner surface facing the cooling apparatus mounting area is provided.
[0010]
As described above, the heat transfer area (cooling fin area) is provided inside the disk device, that is, the inner surface of the housing, and the area where the cooling member can be attached is provided outside the disk apparatus, and these areas are opposed to each other. Since the heat inside the disk drive is efficiently transmitted in the area where the disk is provided, an area where a cooling member can be attached is installed on the opposite surface of the heat transfer area, so that the heat inside the disk drive can be efficiently and easily transferred to the disk It is possible to provide a disk device that can diverge outside the device.
[0011]
Further, a housing used in the disk device of the present invention includes a motor for rotating a disk-shaped recording medium, a head for reading data from the recording medium, and a circuit board on which a circuit for controlling the motor and the head is mounted. A housing used for a disk drive having: a motor and an inner surface capable of incorporating the head; a cooling fin provided on the inner surface; a region in which the circuit board can be mounted; An outer surface having an area in which a cooling device for absorbing and radiating the emitted heat can be attached, and the cooling fins and the area in which the cooling device can be attached face back-to-back. .
[0012]
With such a configuration, the heat inside the disk device is efficiently transmitted in the region (heat transfer region) where the cooling fins are provided inside the disk device, and the transferred heat is provided on the opposite surface of the heat transfer region. Since the casing can be cooled and dissipated through the area where the members can be attached, it is possible to provide a casing that can efficiently and easily radiate the heat inside the disk device to the outside of the disk device. Become.
[0013]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the invention will be described with reference to the drawings.
FIG. 1 shows the configuration of a magnetic disk device as an example of a disk device according to an embodiment of the present invention. This magnetic disk device is a hard disk device on which two fixed disks 3 are mounted. The two fixed disks 3 are mounted on a spindle motor 4 and are controlled so as to rotate at a predetermined rotation speed during operation of the magnetic disk device. This magnetic disk device is provided with an actuator 7 in which a suspension 7a on which a magnetic head 6 such as an MR head is mounted and a thin plate arm 7b made of stainless steel, and a voice coil motor 8 for driving the actuator 7 are provided. A group of components constituting the above-described magnetic disk drive is housed in a housing and is referred to as a mechanical unit.
[0014]
The housing is composed of a cover 2 as an upper lid and a housing 1 as a storage container. The cover 2 is fixed to the housing 1 by screws 5, and the housing 1 and the cover 2 form a closed space. Note that, in order to increase the degree of sealing inside the housing 1 covered with the cover 2, the housing 1 and the cover 2 are closely contacted with a gasket (not shown) interposed therebetween.
[0015]
Further, a printed circuit board 10 is disposed outside the housing constituted by the housing 1 and the cover 2, that is, in the present embodiment, on the outer surface of the housing 1 opposite to the cover 2 of the housing. The printed circuit board 10 includes a control circuit (IC circuit) 11 for controlling a spindle motor 4, a magnetic head 6, a voice coil motor 8, and the like, which are mechanical units of the magnetic disk device, a DRAM as a memory, a hard disk controller ( HDC) and a servo control circuit are mounted and wired, and are electrically connected to each mechanism in the housing by connectors 12 and 14.
[0016]
The printed circuit board 10 is fixed to the housing 1 of the housing by screws (not shown). At this time, the connector 12 provided on the printed circuit board 10 is fitted with the connector 14 provided on the housing 1 side. Mounted to fit.
[0017]
<First embodiment>
A first embodiment of the present invention will be described in detail with reference to FIGS.
FIG. 2 is a perspective view showing the inner surface structure of the housing 1 of the housing according to the first embodiment of the present invention. FIG. 3 is a partially enlarged view illustrating a state in which an actuator 7 and a voice coil motor 8 for driving the actuator 7 are mounted on the inner surface of the housing 1 of the housing according to the first embodiment. FIG. 4 is a perspective view showing an outer surface structure of the housing 1 of the housing according to the first embodiment.
[0018]
Hereinafter, this embodiment will be described with reference to the drawings.
In FIG. 2, the housing 1 of the housing is provided with a spindle motor mounting hole 41, which is a mounting portion for mounting the spindle motor 4, near the center thereof. Further, a rotation shaft of the actuator 7 is mounted on the housing 1 of the housing, and an actuator rotation shaft mounting hole 71 for mounting the actuator 7 is provided. Further, a wall is formed around the housing 1 of the housing, and the wall is formed higher than the surface on which the fixed disk 3 and the actuator 7 are mounted. A plurality of cover mounting screw holes 51 are provided at predetermined positions on this wall, and the inner surface of the housing 1 of the housing is covered with the cover 2 described above. So that it is fixed.
[0019]
Further, a heat transfer area 15 for transferring heat inside the magnetic disk device is provided in a part of the inner surface of the housing 1 of the housing. The heat transfer area 15 is provided with cooling fins 16 in which a plurality of irregularities are regularly formed. In the present embodiment, the cooling fins 16 are provided on the inner surface of the bottom surface or the inner surface of the wall of the housing 1 of the housing, and these cooling fins 16 are provided on the voice coil motor 8, the fixed disk 3, and the spindle. It is provided in a region where the mechanical parts such as the motor 4 and the magnetic head 6 are not mounted (mounted) and do not hinder the operation of these mechanical parts.
[0020]
Since the cooling effect can be improved by increasing the surface area of the cooling fins 16 as much as possible, it is preferable that the number of concaves and convexes be formed finely.
The cooling fins 16 enable the heat inside the magnetic disk drive to be efficiently transmitted to the outside of the housing 1 of the housing.
FIG. 3 shows a state in which an actuator 7 and a voice coil motor 8 for driving the actuator 7 are mounted on the inner surface of the housing 1 of the housing according to the present embodiment. As described above, the cooling fins 16 are provided on the inner surface of the bottom surface or the inner surface of the wall of the housing 1 of the housing. The cooling fins 16 provided on the inner surface of the bottom surface of the housing 1 are invisible from FIG. That is, a head suspension assembly (HSA) formed of a magnetic head 6, a suspension 7a, and an arm 7b is stacked and mounted on an actuator rotation shaft 7c to form an actuator 7, and these and a voice coil motor for rotating these. This is because the above-mentioned cooling fins 16 are provided so as to avoid the trajectory at the time of mounting (mounting) and operation of the magnetic disk drive 8. The overall size is reduced.
[0021]
Next, the shape of the outer surface of the housing 1 of the housing will be described with reference to FIG. The housing 1 is provided with a spindle motor mounting hole 41, which is a mounting portion for mounting the spindle motor 4, near the center thereof so as to penetrate from the inner surface described above. Further, the housing 1 is provided with a rotation shaft of the actuator 7, and an actuator rotation shaft mounting hole 71 for mounting the actuator 7 is provided so as to penetrate from the inner surface similarly to the spindle motor mounting hole 41 described above. .
[0022]
On the outer surface of the housing 1 of the housing, a control circuit (IC circuit) 11 for controlling the spindle motor 4, the magnetic head 6, the voice coil motor 8, and the like, which are mechanical units of the magnetic disk drive, and a memory are provided. A DRAM, a hard disk controller (HDC), and a servo control circuit are mounted and wired, and an area where the printed circuit board 10 electrically connected to each mechanism in the housing by the connectors 12 and 14 is provided.
[0023]
A plurality of screw holes 101 for mounting and fixing the printed circuit board 10 with screws (not shown) are provided on the outer surface of the housing 1 of the housing. In the present embodiment, the screw holes 101 are provided at least at some corners of the housing 1, and are provided at portions necessary for mounting the printed circuit board 10 and the housing 1 while avoiding a cooling device mounting area described later.
[0024]
The printed circuit board 10 is fixed to the outer surface of the housing 1 of the housing with screws. At this time, the connector 12 provided on the printed circuit board 10 is fitted with the connector 14 provided on the housing 1 side. It shall be attached as follows.
[0025]
A plurality of body fixing screw holes 17 into which screws serving as fixing members for fixing the magnetic disk device to an electronic device such as a PC are provided on the outer surface of the housing 1 of the housing. The position of the screw hole 17 is defined by standards or the like, but is mainly provided at each corner of the bottom surface of the outer surface of the housing 1 or at each corner of the side surface.
[0026]
Further, on the outer surface of the housing 1 of the housing, a region 18 to which a cooling device can be attached is provided in a region other than the region where the above-mentioned printed circuit board 10 can be attached. The cooling device mounting area 18 has a flat surface formed on its surface so that the cooling device can be mounted, and has a mounting screw hole 18a and a step 18b for actually mounting the cooling device. .
[0027]
In this embodiment, a cooling device mountable area 18 provided on the outer surface of the housing 1 of the housing, a heat transfer area 15 for transferring heat of the device provided on the inner surface of the housing 1 of the housing, In other words, the region where the cooling fins 16 in which a plurality of irregularities are regularly formed is provided is a region facing the back-to-back via the material of the housing 1.
[0028]
That is, the heat in the magnetic disk device collected by the cooling fins 16 provided in the heat transfer region 15 on the inner surface of the housing 1 is opposed to the cooling device provided on the outer surface of the housing 1 in a back-to-back manner. The heat is transmitted to the mountable area 18 and is further removed by absorbing the heat and radiating the heat to the outside of the apparatus by the cooling apparatus mounted on the coolable area 18.
[0029]
Naturally, since the cooling device mountable area 18 has a planar configuration in close contact with the cooling device, the heat inside the magnetic disk device is efficiently transmitted to the cooling device, thereby improving the heat exchange efficiency.
[0030]
As described above, the heat transfer area 15 (specifically, the cooling fin 16 provided in the heat transfer area) inside the magnetic disk device, that is, the inner surface of the housing 1 of the housing, and the outside of the magnetic disk device, that is, the case A region 18 to which a cooling member can be attached is provided on the outer surface of the housing 1 of the body, and these regions 15 and 18 are opposed to each other. In order to transfer the heat, a region 18 to which a cooling member can be attached is provided on the opposite surface of the heat transfer region 15 so that heat inside the device can be efficiently and easily radiated to the outside of the magnetic disk device.
[0031]
<Second embodiment>
A second embodiment of the present invention will be described with reference to FIG. The second embodiment is an example in which a cooling structure 21 is provided at a location distant from the magnetic disk device via a heat pipe 20 from a cooling member mountable area 18.
[0032]
A plurality of screw holes 101 for mounting and fixing the printed circuit board 10 with screws (not shown) are provided on the outer surface of the housing 1 of the housing as in the first embodiment described above. A plurality of body fixing screw holes 17 into which screws serving as fixing members for fixing the magnetic disk device to an electronic device such as a PC are provided on the outer surface of the housing 1 of the housing. On the outer surface of the housing 1 of the housing, a region 18 where a cooling device can be mounted is provided in a region other than the region where the above-mentioned printed circuit board 10 can be mounted, and the cooling device can be mounted on the surface thereof. Such a flat surface is formed, and the cooling device 19 is attached with the screw 19a.
[0033]
The cooling device 19 is connected to a strip-shaped heat pipe 20 which is made of a metal having high thermal conductivity such as copper and can be appropriately deformed. Further, a cooling structure 21 having a fin structure for increasing the surface area as much as possible is connected to a metal such as aluminum having a high radiation efficiency at the end of the heat pipe 20.
[0034]
The heat generated in the magnetic disk drive housing is transmitted to the cooling device 19, transmitted through the heat pipe 20, and further efficiently radiated through the cooling structure 21. In this embodiment, since the cooling structure 21 is configured not to directly contact the magnetic disk device, efficient cooling can be performed without increasing the thickness around the magnetic disk device. Further, the arrangement of the cooling structure 21 can be varied, so that the degree of freedom in arrangement and design when mounting the magnetic disk device having the cooling mechanism as in the present embodiment on a personal computer or the like can be ensured.
[0035]
The above-mentioned cooling structure 21 can be made of a metal having a high heat radiation efficiency, but can be changed to one having a water cooling function using liquid or the like.
In the embodiment of the present invention, the example in which the heat transfer area 15 and the fixable area 18 of the cooling member are provided in the housing 1 of the housing has been described. However, similar areas can be provided in the cover 2 of the housing.
[0036]
Further, in the present embodiment, the invention has been described by taking the case of the magnetic disk device as an example, but it is needless to say that the present invention is also applicable to the case of an optical disk device provided with a motor or the like that generates heat.
[0037]
【The invention's effect】
As described in detail above, according to the present invention, a heat transfer area (cooling fin area) is provided inside the disk device, that is, on the inner surface of the housing, and a region where a cooling member can be attached outside the disk device. Since the heat inside the disk device is efficiently transmitted in the area where the cooling fins are provided, an area where the cooling member can be attached is installed on the opposite surface of the heat transfer area, and It is possible to provide a disk device capable of efficiently dissipating heat to the outside of the disk device easily and a housing used for the disk device.
[Brief description of the drawings]
FIG. 1 is an exploded perspective view illustrating the structure of a magnetic disk drive according to an embodiment of the present invention.
FIG. 2 is a perspective view illustrating an inner surface of a housing of the housing according to the first embodiment of the present invention.
FIG. 3 is a perspective view illustrating a state in which a mechanism and the like are mounted on the inner surface of the housing of the housing according to the first embodiment of the present invention.
FIG. 4 is a perspective view for explaining a housing outer surface of the housing according to the first embodiment of the present invention.
FIG. 5 is a perspective view illustrating a cooling member mounting state according to a second embodiment of the present invention.
[Explanation of symbols]
1 Housing 2 Cover 3 Disk 4 Spindle motor 5 Cover mounting screw 6 Magnetic head 7 Actuator 7a Suspension 7b Arm 7c Actuator rotating shaft 8 Voice coil motor 10 Printed circuit board 11 Control circuit (IC circuit)
12 ... printed circuit board side connector 14 ... housing side connector 15 ... heat transfer area 16 ... cooling fin 16
17 screw hole 18 cooling device mountable area 18a cooling device mounting screw hole 18b step 41 spindle motor mounting hole 51 cover cover screw hole 71 actuator rotation shaft mounting hole 101 print Screw holes for circuit board mounting

Claims (6)

A motor for rotating a disk-shaped recording medium,
A head for reading data from the recording medium,
A circuit board on which a circuit for controlling the motor and the head is mounted,
A housing having an inner surface on which the motor and the head are built-in, and an outer surface on which the circuit board can be mounted, and a cooling device that absorbs heat from the housing and dissipates heat to the outer surface can be attached. A disk device, comprising: a housing provided with a cooling device mountable region, and a cooling fin provided at a position on the inner surface facing the cooling device mountable region. 2. The disk device according to claim 1, wherein the cooling device mountable area is formed in a planar shape. 2. The disk device according to claim 1, wherein the cooling fin is formed in an area on the inner surface of the housing where the motor and the head are not mounted. A housing used for a disk device having a motor for rotating a disk-shaped recording medium, a head for reading data from the recording medium, and a circuit board on which a circuit for controlling the motor and the head is mounted,
An inner surface capable of incorporating the motor and the head,
Cooling fins provided on the inner surface,
An outer surface having an area where the circuit board can be mounted and an area where a cooling device that can absorb and radiate heat emitted from the housing can be attached;
A housing for use in a disk drive, wherein the cooling fins and the area where the cooling device can be mounted face each other back to back. 5. The housing according to claim 4, wherein the outer surface of the outer surface where the cooling device can be attached is formed in a flat shape. The housing according to claim 4, wherein the cooling fin is formed in an area on the inner surface of the housing where the motor and the head are not mounted.

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