JP2008310855A - Electronic device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electronic device capable of effectively radiating heat generated in an electronic unit such as a disk driving device. <P>SOLUTION: In the electronic device 1 where an electronic unit having a heat generator is mounted, a cooling device 8A is provided with a sheet-like member including a first heat transmission part 811 for receiving heat generated from the electronic unit, a heat transmission part 812 extending in a belt shape to transfer the received heat, and a second heat transmission part 813 heat-connected to a predetermined part of the casing 2 of the electronic device 1 on the extension of the heat transmission part 812. The cooling device 8A is further provided with a heat transfer means heat-connected to the electronic unit to be disposed in a roughly sealed case 10, and a cooling part 30A heat-connected to the second heat transmission part 812 of the sheet-like member outside the roughly sealed case 813 to transfer the heat of the electronic unit to the outside of the roughly sealed case 10, thereby radiating it. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an electronic device, and more particularly to an electronic device that improves the performance of a disk drive device by suppressing noise and heat generation of a disk drive device that transfers large amounts of information at high speed.

  In recent years, optical disk drive devices mounted on DVD (Digital Versatile Disk) recorders and hard disk drive devices (HDD (Hard Disk Drive)) mounted on personal computers, DVD recorders, etc., respond to diversification and diversification of information. Therefore, a large capacity and a high transfer speed are required. In addition, these electronic devices tend to be equipped with a plurality of disk drive devices in order to improve performance. On the other hand, electronic devices equipped with optical disk drive devices and HDDs are desired to be reduced in size in order to cope with diversification of uses.

  The disk drive device rotates a spindle motor that drives a recording medium at a high speed in order to meet the needs for these electronic devices. However, this high-speed rotation increases the heat generated from the stator coil of the spindle motor and also increases the frictional heat in the spindle motor rotating shaft and the bearing. In addition, due to this high speed rotation, the sound generated from the rotation of the disk itself and the sound accompanying the seek become even louder. These increases in heat and noise not only cause the performance of the disk drive device to deteriorate, but also cause problems for the surrounding environment.

  Therefore, in order to solve these problems, the leakage of external noise of the disk drive device is suppressed by maintaining airtightness in the mounting of the disk drive device, and on the other hand, the heat to the outside of the disk drive device is suppressed. A technique for releasing heat generated by securing an escape path is known. For example, Patent Document 1 discloses a heat dissipation hole formed in a porous elastic member by covering a disk drive device with a porous elastic member having a property of absorbing vibration and sound in which a heat dissipation hole is formed. It is described that it is possible to dissipate heat generated in the disk drive device.

  In Patent Document 2, a sound absorbing material is disposed inside the disk case, the hard disk device is attached to the lid member of the disk case in a suspended state, and an airtight space is formed in the disk case to absorb noise. It is described that noise leakage to the outside can be suppressed.

  Patent Document 3 describes that a groove is provided on the outer surface of the disk case to increase the contact area with the outside air and improve the heat dissipation effect.

  In Patent Document 4, the disk drive device is included in an outer casing with a foamed resin sheet attached to reduce seek noise, and between the casing of the disk drive apparatus and the outer casing. It is described that the heat accumulated in the housing is dissipated from the outer housing by the thermal connection in which the far-infrared receiving and receiving members are arranged to face each other.

JP 2006-127718 A JP 2004-234777 A JP 2005-285154 A JP 2005-222585 A

  However, each of the above conventional techniques has a problem to be solved.

  The technique described in Patent Document 1 has a trade-off relationship that the number of holes for heat dissipation is preferably large for heat dissipation, whereas it is preferably small for noise suppression.

  Further, the technique described in Patent Document 2 has a problem that when the amount of heat generated by the hard disk device exceeds the amount of heat released by the lid member, the temperature rise of the hard disk device cannot be sufficiently suppressed.

  In addition, since the technology described in Patent Document 3 and Patent Document 4 is configured to dissipate heat at the external wall of the housing that includes the HDD, the heat dissipation amount depends on the area of the external wall of the housing. There is a problem similar to the technique described in Document 2.

  An object of the present invention is to provide an electronic device that effectively dissipates heat generated in an electronic unit such as a disk drive device.

  In order to achieve the above object, according to the present invention, there is provided an electronic device including an electronic unit having a heat source, a housing for housing the electronic device, a mounting frame body for holding the electronic unit, and the mounting frame body. And a heat transfer cooling mechanism that is thermally connected to the electronic unit and heat-transfers and cools the heat generated from the heat generation source, and the heat transfer cooling mechanism includes: A first heat transfer portion for receiving heat generated by the electronic unit; a heat conducting portion extending in a belt shape for transferring the received heat; and a predetermined portion of the casing of the electronic device on an extension of the heat conducting portion. A heat transfer means arranged in the inside of the substantially sealed case in thermal connection with the electronic unit, and a second heat transfer portion that is thermally connected to the first portion. 2 is connected to the outside of the substantially sealed case and the electron The heat generation of the knit can be configured to have a cooling means for radiating and heat transfer to the outside of the symbolic closed case.

  In addition, the electronic unit is a disk drive device, and a soundproof member for preventing sound generated by the electronic unit is disposed on the inner wall of the substantially sealed case, and the first heat transfer portion of the sheet-like member is used. The disk drive device can be enclosed in the substantially sealed case so as to be detachable.

  In addition, the cooling means is a liquid cooling system that circulates the refrigerant and transfers heat, and is heat-connected to the heat conducting portion and provided with a heat receiving member provided with a flow path through which the refrigerant flows, and the heat receiving member A heat radiating member that radiates the heat received by the refrigerant flowing through the inside of the member to the outside of the housing may be configured to circulate the refrigerant.

  Further, the plurality of second heat transfer units of the plurality of disk drive devices can be configured to be thermally connected to the cooling means.

  ADVANTAGE OF THE INVENTION According to this invention, the electronic device which can thermally radiate the heat | fever which generate | occur | produces in a disk drive device effectively can be provided, making the disk drive device mounted in an electronic device detachable.

Next, the best mode for carrying out the present invention will be described based on the following embodiments with reference to the drawings.
[Example 1]
FIG. 1 is a block diagram of a first embodiment of the present invention.
1 includes a housing 2, an optical disk device 3, an HDD 4, a circuit board 5, a power source 6, a CPU (Central Processing Unit) 7, a mounting frame 9, a substantially sealed case 10, a soundproof material 11, and a cooling device 8A. It is composed of

  The housing 2 is a box that houses an electronic unit that constitutes the electronic device 1. The optical disk device 3 is a device that reads and writes data on an optical disk using laser light. The circuit board 5 is a board on which an element such as a transistor for controlling the electronic device 1 is mounted. The power source 6 is a power source for driving the electronic device 1. The CPU 7 is a device that executes control of each device, calculation of data, and the like. The HDD 4 is a hard disk device.

  FIG. 3 is a configuration example of the HDD 4, (A) is a plan view of the HDD 4, and (B) is a side view. 3 includes a magnetic disk 41, a spindle motor 42, a magnetic head 43, an HDD side body 44, an HDD lid body 45, an HDD bottom body 46, an HDD housing 47, an HDD circuit board 48, and a spindle motor holding portion region area 451. It is composed of

  The magnetic disk 41 is a storage medium in which a thin disk made of resin is coated with a magnetic material. The spindle motor 42 is power that rotates the magnetic disk. The magnetic head 43 reads and writes magnetic data with respect to the magnetic recording layer on the surface of the magnetic disk. The HDD side body 44 is a part of the side part that constitutes the HDD housing 47. The HDD lid 45 is an upper part (corresponding to a lid function) constituting the HDD housing 47. The HDD bottom body 46 is a bottom part constituting the HDD housing 47. The HDD housing 47 is a box that encloses the HDD 4. The HDD circuit board 48 is a board on which an element such as a transistor for controlling the HDD 4 is mounted. Further, the HDD 4 has an HDD circuit board 48 including a drive control circuit for the spindle motor 42 and the magnetic head 43 and the like mounted below the HDD housing 47.

  In order to make the HDD 4 easily attachable to and detachable from the electronic apparatus 1, the HDD side body 44, the HDD lid body 45, and the HDD bottom body 46 (the HDD side body 44 and the HDD lid body 45, or the HDD bottom body 46 are integrated. A rectangular parallelepiped-shaped sealed structure is formed by using the HDD housing 47 as a whole. The mounting frame body 9 holds the HDD 4.

  FIG. 5 is a perspective view of a configuration example in which the HDD 4 is mounted on the mounting frame body 9. The HDD 4 is held together with the high thermal conductivity sheet 81 by the mounting frame 9 of the HDD 4 in a state of being thermally connected to the HDD casing 47 by the high thermal conductivity sheet 81. The mounting frame 9 is provided with a pressing member 91 for pressing and holding the HDD housing 47. The pressing member 91 presses one plane of the HDD casing 47, and holds the HDD 4 with the opposing plane of the HDD casing 47 on one plane of the mounting frame body 9.

  The high heat conductive sheet 81 extends from the mounting frame body 9 in a band shape from the first heat transfer portion 811 that is thermally connected to the HDD 4 and receives the heat generated by the HDD 4 and a part of the high heat conductive sheet 81 that is thermally connected to the HDD 4. It has a heat conduction portion 812 that is drawn out, and a second heat transfer portion 813 that is thermally connected to the casing 2 of the electronic device 1 on its extension. In addition, description of the 1st heat-transfer part 811, the heat conductive part 812, and the 2nd heat-transfer part 813 is mentioned later. The high heat conductive sheet 81 wraps the HDD housing 47 including at least the spindle motor holding portion region 451 of the HDD lid 45 from the three directions. The substantially sealed case 10 is a box that houses the mounting frame 9.

  FIG. 4 shows a configuration example of the substantially sealed case 10 including the HDD 4. The substantially sealed case 10 is composed of a case main body 101 and a case lid 102. The case lid 102 is incorporated in the case main body 101 in the A direction. The HDD 4 is contained in the substantially sealed case 10 in the A direction in a state of being thermally connected by the high thermal conductive sheet 81, and is inserted and held in the mounting frame body 9 placed on the substantially sealed case 10. The case lid 102 has an opening 1021 for pulling out the heat conducting portion 812 at the lower right portion thereof. The width w0 of the opening 1021 is larger than the drawer width w1 of the transfer unit 812.

  Here, the high heat conduction sheet (for example, the carbon graphite sheet) 81 is anisotropic in terms of heat conduction characteristics because the HDD housing 47 is encased in heat by the first heat transfer portion 811 of the high heat conduction sheet 81. It is because it has sex. The thermal conductivity (600 to 800 W / m / K) in the planar direction of the high thermal conductive sheet 81 is about twice as good as that of copper (350 to 400 W / m / K). Since the thermal conductivity (5 to 8 W / m / K) is about several tenths of the thermal conductivity of copper, the thermal conduction in the thickness direction acts as a thermal resistance. A series of thermal connections for receiving the heat of the heating element, conducting the heat, and radiating and cooling the same are made on the same plane of the high thermal conductive sheet 81, and the characteristics of the high thermal conductivity having this anisotropy. Is used. The substantially sealed case 10 is provided with a soundproof material 11 inside the case main body 101 and the case lid 102. The soundproof material 11 is a member for sound insulation and sound absorption, and is made of a sponge-like soft synthetic resin.

  The cooling device 8 </ b> A includes a first heat transfer unit 811, a heat conduction unit 812, a second heat transfer unit 813, and a cooling unit 30. The first heat transfer unit 811 is made of a carbon graphite sheet, which is a high heat conductive sheet, is in close contact with the outer surface of the HDD 4, includes the outer shape of the HDD 4, and receives heat generated by the HDD 4. The heat conducting unit 812 is composed of a carbon graphite sheet, and conducts heat received by the first heat transfer unit 811 to the second heat transfer unit 813. The second heat transfer unit 813 is made of a carbon graphite sheet, and transfers the heat conducted by the heat conducting unit to the housing 2.

  The cooling unit 30 </ b> A is thermally connected to the second heat transfer unit 813 outside the substantially sealed case 10, transfers heat generated by the HDD 4 to the outside of the substantially sealed case 10, and rotates the fan 80 to generate a second heat The heat transferred from the transmission unit 813 to the housing 2 is discharged to the outside.

  Here, the object to be cooled by the cooling device 8 </ b> A of the present embodiment is the HDD 4 among the heating elements mounted on the electronic device 1. Like the HDD 4, the optical disk device 3 and the CPU 7 are also heat generators, and the cooling device 8A can cool these heat generators in the same manner as the HDD 4. However, in this embodiment, the HDD 4 is used as a representative example and the high transfer of the HDD 4 is performed. The electronic apparatus 1 in the case where the cooling device 8A for suppressing noise and heat generation caused by high-speed rotation of the spindle motor accompanying the speed increase will be described.

  First, heat generation and noise associated with the read operation of the HDD 4 will be described. The plurality of magnetic disks 41 arranged in a stacked manner are fixed to the rotating body of the spindle motor 42. The HDD 4 rotates the spindle motor 42 at a predetermined number of rotations to rotate the magnetic disk 41 fixed simultaneously, and reads information recorded on the magnetic disk 41 by the magnetic head 43.

  The high transfer speed of the HDD 4 is realized by increasing the rotation speed of the magnetic disk 41 by increasing the rotation speed of the spindle motor 42. For this reason, when the spindle motor 42 rotates at a high speed, heat generated from the stator coil and the bearing increases. The increased heat is first transferred to the spindle motor holding part region 451 of the HDD lid 45 located above the spindle motor 42. The heat transferred is further diffused into the entire HDD housing 47 through the entire HDD lid 45.

  On the other hand, the high-speed rotation of the spindle motor 42 increases the sliding sound of the bearing and the seek sound due to the magnetic head accessing the magnetic disk. In this way, heat and noise are generated with the operation of the HDD 4.

Next, of the heat generation and noise generated in the HDD 4, the soundproofing operation against noise will be described first.
The HDD 4 is configured to be included in the substantially sealed case 10 as described above. That is, since the HDD 4 is confined in the substantially sealed case 10, noise due to the drive of the HDD 4 is blocked from the outside by the substantially sealed case 10, and noise leakage to the outside of the substantially sealed case 10 is prevented. Can be suppressed. Moreover, since the soundproofing material 11 is installed inside the case main body 101 and the case lid 102, the substantially sealed case 10 can further enhance the soundproofing effect.

  However, when the HDD 4 is confined in the substantially sealed case, there is a problem that heat generated by driving the HDD 4 stays in the substantially sealed case. Therefore, cooling with respect to the heat generated in the HDD 4 is necessary. Next, with regard to this cooling, the operation of heat radiation with respect to the heat generation of the HDD 4 will be described.

  The heat generated in the HDD 4 is first received by the first heat transfer portion 811 of the high heat conductive sheet 81. The received heat is transferred to the outside of the substantially sealed case 10 by heat conduction by the belt-like heat conducting portion 812. The heat transferred to the outside is thermally conducted to the second heat transfer unit 813. The second heat transfer unit 813 is thermally connected to the housing 2 of the electronic device 1 and radiates the surface thereof using the housing 2 as a heat diffusion plate. Furthermore, in this embodiment, if the entire surface area of the housing 2 is a heat diffusing plate, heat can be radiated from a wider area, and the heat radiating effect can be improved.

  In addition, the electronic device 1 is provided with a fan 80 in the vicinity of the second heat transfer unit 813. This improves the heat dissipation effect in the housing 2 by passing the fan 80.

  Here, as one of the characteristics of the cooling device 8A, the first heat transfer unit 811 and the heat conduction unit 812 are configured integrally, but can be separated from the heat conduction unit 812 in the second heat transfer unit 813. The heat connection configuration is adopted. Accordingly, the attachment / detachment of the HDD 4 to / from the electronic device 1 can be easily handled integrally with the cooling device 8A. As an example of this, a configuration example when a plurality of HDDs 4 are mounted on the electronic device 1 will be described below. The electronic device 1 is provided with a holding frame body 9 on which a plurality of HDDs 4 can be mounted by laminating substantially hermetic cases 10 or arranging them in parallel. The HDD 4 thermally connected by the high heat conductive sheet 81 is inserted into each substantially sealed case 10. The second heat transfer portion 813 of each high thermal conductive sheet 81 is thermally connected to the housing 2 of the electronic device 1. By doing so, it is possible to mount a plurality of HDDs 4 also in the present embodiment.

  As described above, in the first embodiment, noise is reduced by the configuration in which the HDD 4 is confined in the substantially sealed case 10, and heat generated in the HDD 4 by the cooling device 8A is transmitted to the housing 2 to dissipate heat. Can be efficiently dissipated.

  Further, since the high thermal conductivity sheet 81 is in close contact with the surface of the HDD 4 and includes the HDD 4, heat can be received from the outer surface of the HDD 4, so that the heat radiation efficiency can be improved.

In addition, this configuration also has an effect of facilitating attachment / detachment of the HDD 4 to / from the mounting frame body 9.
[Example 2]
FIG. 2 is a block diagram of the second embodiment of the present invention. In the present embodiment, since the other components except the cooling unit 30B are the same, the description will focus on the cooling unit 30B. The difference from the first embodiment is that the heat radiation at the second heat transfer portion 813 uses a refrigerant instead of the fan 80.

  The cooling unit 30 </ b> B includes a heat receiving member 82, a pump 83, a tank 84, a heat radiating member 85, and a pipe 86. The heat receiving member 82 is provided with a flow path through which the refrigerant flows. The pump 83 causes the refrigerant to flow through the flow path of the heat receiving member 82. The tank 84 stores the refrigerant. The heat radiating member 85 is connected to the heat receiving member 82 by forming a circulation flow path of the refrigerant through the pipe 86, and radiates the heat of the received refrigerant.

  Next, the heat radiation operation for the heat generation of the HDD 4 will be described. The heat generated by the HDD 4 is first transferred to the second heat transfer unit 813 by the high heat conductive sheet 81 as in the first embodiment. The heat transferred to the second heat transfer unit 813 radiates heat to the refrigerant flowing through the heat receiving member 82. The heat of the received refrigerant is dissipated by transferring heat to the atmosphere through the heat dissipating member 85 provided so as to project outside the housing 2.

  In the present embodiment, the cooling device 8B is provided on the outer side of the case 10 that seals the heat conducting portion 812 of the high heat conductive sheet 81 so that the HDD 4 can be easily attached and detached and the heat connection between the high heat conductive sheet 81 and the heat radiating member 85 is facilitated. The heat receiving member 82 and the high thermal conductive sheet 81 are thermally connected to the outside of the substantially sealed case 10. As a modified example, the heat receiving member 82 of the cooling unit 30 </ b> B is provided inside the substantially sealed case 10, thermally connected to the heat conducting unit 812 of the high thermal conductive sheet 81, and provided outside the sealed case 10 via the pipe 86. Alternatively, the refrigerant may be circulated with the heat dissipation member 85.

  Further, as a modification when cooling a plurality of HDDs 4, the heat receiving member 82 is arranged so that the spindle motor holding part regions 451 corresponding to the heat transfer areas of the HDDs 4 face each other (the spindle motor holding part region 451 of the HDD 4 is sandwiched between them). (Position) and sharing. Further, this modified example may have a configuration in which the cooling unit 30A of the first example and the cooling unit 30B of the second example are used in combination for improving the cooling performance.

  As a modification of the member used for heat transfer of the cooling device 8A and the cooling device 8B, the high heat conductive sheet 81 may be a heat conductive member such as an aluminum material having excellent heat conductivity. Furthermore, this modification may be configured such that the heat conducting member is also used as the mounting frame 9.

  The present invention is not limited to the specifically disclosed embodiments, and various modifications and changes can be made without departing from the scope of the claims.

It is a block diagram of the electronic device by a 1st Example. It is a block diagram of the electronic device by a 2nd Example. 2 is a diagram illustrating a configuration example of an HDD 4. FIG. 1 is a diagram illustrating a configuration example of a substantially sealed case 10 that includes an HDD 4. FIG. 6 is a perspective view of a configuration example in which the HDD 4 is mounted on a mounting frame body 9.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1: Electronic device 2: Housing | casing 3: Optical disk device 30A, 30B: Cooling part 4: HDD, 41: Magnetic disk 42: Spindle motor 43: Magnetic head 47: HDD housing 48: HDD Circuit board, 5: Circuit board, 6: Power supply, 7: CPU, 8A, 8B: Cooling device, 80: Fan, 81: High heat conduction sheet, 82: Heat receiving member, 83: Pump, 84: Refrigerant storage tank, 85: Radiating member, 86: piping, 811: first heat transfer section, 812: heat conduction section, 813: second heat transfer section, 9: mounting frame, 10: substantially sealed case, 11: soundproofing material

Claims (4)

In an electronic device equipped with an electronic unit having a heat source,
A housing that houses the electronic device, a mounting frame that holds the electronic unit, a box-like substantially sealed case that includes the mounting frame inside, and a heat source that is thermally connected to the electronic unit and is generated from the heat source A heat transfer cooling mechanism that cools the generated heat by heat transfer,
The heat transfer cooling mechanism includes a first heat transfer unit that receives heat generated by the electronic unit, a heat conduction unit that extends in a belt shape that heat-transfers the received heat, and an extension of the heat transfer unit. A heat transfer means comprising a sheet-like member having a second heat transfer portion thermally connected to a predetermined portion of the casing of the device, and being thermally connected to the electronic unit and disposed inside the substantially sealed case; ,
And a cooling means that is thermally connected to the second heat transfer portion of the sheet-like member and the outside of the substantially sealed case, and transfers heat generated from the electronic unit to the outside of the substantially sealed case to dissipate heat. Features electronic equipment. The electronic unit is a disk drive device,
A soundproof member for soundproofing the sound generated by the electronic unit is disposed on the inner wall of the substantially sealed case, and the disk drive device is enclosed by the first heat transfer portion of the sheet-like member in the substantially sealed case. The electronic device according to claim 1, wherein the electronic device is detachably stored. The cooling means is a liquid cooling system that circulates a refrigerant and transfers heat,
A heat receiving member thermally connected to the heat conducting portion and provided with a flow path through which the refrigerant flows;
The electronic apparatus according to claim 1, further comprising: a heat radiating member that radiates heat received by the refrigerant flowing through the heat receiving member to the outside of the housing.   4. The electronic apparatus according to claim 1, wherein the plurality of second heat transfer units of the plurality of disk drive devices are thermally connected to the cooling unit.

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