JP2010033103A - Electronic equipment and printed circuit board - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide electronic equipment and a printed circuit board for transferring heat generated from a plurality of heating components to a radiation member by one heat transfer member. <P>SOLUTION: The electronic equipment includes: the radiation member for radiating heat; a heat transfer member installed so as to be extended from the radiation member for transferring heat to the radiation member; a circuit board on which a plurality of radiation members for generating heat are mounted; and a plurality of heat receiving members placed between the respective heating members with heat connecting members interposed, and equipped with insertion holes through which the heat transfer member is inserted. The heat receiving member is packed with thermally conductive grease in gaps formed between the internal wall faces of the insertion holes and the heat transfer members. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an electronic device on which a heat generating component is mounted and a printed circuit board.

  An electronic device such as a portable computer such as a notebook personal computer has a circuit board on which a heat generating component such as a CPU (Central Processing Unit) is mounted. As an example of a structure for cooling the heat generating component mounted on such a circuit board, there is RHE (Remote Heat Exchanger). The RHE transfers heat generated by the heat generating component to the heat radiating fin with a heat pipe, and radiates the heat transferred to the heat radiating fin by cooling the heat radiating fin with a cooling fan. According to RHE, the heat pipe is routed in accordance with the mounting position of the heat generating component, so that even if the heat generating component is mounted at a position away from the heat radiating fin and the cooling fan, the heat generated by the heat generating component is transferred to the heat radiating fin. Heat can be transferred (see Patent Document 1).

  However, although the electronic device described in Patent Document 1 realizes high-level mounting of the heat generating component by mounting the heat generating component on both sides of the circuit board, it is necessary to provide a heat pipe and a heat radiating fin for each heat generating component. Therefore, it is impossible to reduce the size and thickness of electronic devices.

  Therefore, a plurality of heat receiving members placed between each heat generating component mounted on the circuit board with a heat connecting member such as grease or a sheet interposed between the heat radiating fins and the plurality of heat receiving members. A technique may be considered in which heat generated from a plurality of heat generating components is moved to a heat radiating fin by a single heat pipe by being fixed to a circuit board together with a heat transfer member such as a heat pipe provided.

JP 2007-310716 A

  However, since the heat generating components mounted on the circuit board have different heights in the vertical direction of the circuit board for each heat generating component, when an external force is applied to a highly rigid heat transfer member, the heat is received by each heat receiving component. At least one of the heat receiving members is inclined with respect to the heat generating component without being evenly transmitted to the members. Then, since the heat connection member interposed between the heat generating component and the heat receiving member leaks from between the heat generating component and the heat receiving member, there is a problem that heat from the heat generating component cannot be transmitted to the heat receiving member. is there. In addition, the inclination of the heat receiving member with respect to the heat generating component may cause contact or damage between the heat generating component and the heat receiving member.

  The present invention has been made in view of the above, and provides an electronic device and a printed circuit board capable of transferring heat generated from a plurality of heat generating components to a heat radiating member by one heat transfer member. With the goal.

  In order to solve the above-described problems and achieve the object, the present invention includes a heat dissipating member that dissipates heat, a heat transfer member that extends from the heat dissipating member and transfers heat to the heat dissipating member, A circuit board on which a plurality of heat generating components that emit light are mounted, and a plurality of heat receiving members that are placed with a heat connection member interposed between each of the heat generating components and have insertion holes for inserting the heat transfer members, The heat receiving member is characterized in that a heat conductive grease is filled in a gap formed between an inner wall surface of the insertion hole and the heat transfer member.

  The present invention also provides a heat radiating member that radiates heat, a heat transfer member that extends from the heat radiating member and transfers heat to the heat radiating member, a plurality of heat generating components that generate heat, and each of the heat generating components. And a plurality of heat receiving members having insertion holes into which the heat transfer members are inserted, wherein the heat reception members are connected to the inner wall surfaces of the insertion holes and the heat transfer members. A heat conductive grease is filled in a gap formed between the heat member and the heat member.

  According to the present invention, there is an effect that heat generated from a plurality of heat generating components can be transferred to the heat radiating member by one heat transfer member.

  Exemplary embodiments of an electronic apparatus and a printed circuit board according to the present invention will be explained below in detail with reference to the accompanying drawings. The example which applied the electronic device and printed circuit board of this invention to the portable computer is shown. However, the present invention is not limited to a portable computer, and the present invention can be applied to various electronic devices such as a digital camera, a video camera, and a personal digital assistant provided with a printed circuit board on which a plurality of heat generating components are mounted.

(First embodiment)
First, the schematic configuration of the portable computer according to the present embodiment will be described with reference to FIG. FIG. 1 is a perspective view of a portable computer according to the present embodiment.

  A portable computer 1 according to the present embodiment includes a main body 2 and a display unit 3.

  The main body 2 includes a main body base 4 and a main body cover 5. The main body cover 5 is combined with the main body base 4 from above. When the main body base 4 and the main body cover 5 cooperate with each other, the main body 2 includes a housing 6 formed in a box shape.

  The housing 6 has an upper wall 6a, a peripheral wall 6b, and a lower wall 6c. The upper wall 6 a supports the keyboard 7. The peripheral wall 6b has a front peripheral wall 6ba, a rear peripheral wall 6bb, a left peripheral wall 6bc, and a right peripheral wall 6bd.

  The display unit 3 includes a display housing 8 and a liquid crystal display panel 9 accommodated in the display housing 8. The liquid crystal display panel 9 has a display screen 9a. The display screen 9 a is exposed to the outside of the display housing 8 through the opening 8 a on the front surface of the display housing 8.

  The display unit 3 is supported by a rear end portion of the housing 6 via a hinge device. Thereby, the display unit 3 is rotatable between a closed position where the display unit 3 is tilted so as to cover the upper wall 6a from above and an open position where the display unit 3 stands so as to expose the upper wall 6a.

  The housing 6 is provided with a cooling fan 11 that exhales air, a heat dissipating member 13 that dissipates heat using air exhaled from the cooling fan 11, and a heat dissipating member 13 that extends from the heat dissipating member 13. A heat pipe 12 for transferring heat and a circuit board 10 on which a plurality of heat generating components for generating heat are mounted are accommodated. The heat generating component is an electronic component that executes various control processes of the portable computer 1 such as a CPU, a graphics chip, and various chip sets. Note that the heat generating component is not limited to the above-described example, and various electronic components that need to dissipate heat generated in accordance with the execution of the control process are applicable. Compared with the cooling fan 11, these heat generating components are arranged, for example, near the front peripheral wall 6ba of the portable computer 1, that is, near the peripheral wall corresponding to the user side. Although not shown, a plurality of other circuit components are mounted on the circuit board 10.

  Here, the components mounted on the housing 6 and the arrangement thereof will be described in detail with reference to FIGS. 2 and 3. FIG. 2 is a perspective view showing the inside of the casing of the portable computer according to the present embodiment. FIG. 3 is a side view of components mounted on the circuit board as seen from the side.

  The cooling fan 11 is disposed in the vicinity of the left peripheral wall 6bc in the housing 6. For example, a plurality of exhaust holes 22 are provided in the left peripheral wall 6bc of the housing 6 corresponding to the cooling fan 11. The exhaust hole 22 opens to the outside of the housing 6. The cooling fan 11 has an intake port 11a for sucking air and an exhaust port 11b for discharging the sucked air. The intake port 11a is opened on, for example, the upper surface and the lower surface of the cooling fan 11, respectively. The exhaust port 11b opens to the side surface of the cooling fan 11 and faces the exhaust port 11b of the left peripheral wall 6bc. The cooling fan 11 discharges air toward the exhaust hole 22.

  The heat dissipating member 13 dissipates heat generated from various electronic components (heat generating components) housed in the housing 6 and is disposed in the vicinity of the left peripheral wall 6bc of the housing 6 from which the circuit board 10 is removed. Is done. In the present embodiment, the heat radiation member 13 is disposed between the exhaust port 11b of the cooling fan 11 and the exhaust hole 22 of the left peripheral wall 6bc. The heat radiating members 13 extend in parallel to each other along the direction crossing the air discharge direction of the cooling fan 11.

  The heat dissipating member 13 is formed by assembling a plurality of fin elements 13a. The fin element 13a is a plate-like member formed in a rectangular shape, for example. The fin element 13a is made of a metal having a high thermal conductivity such as aluminum. The plurality of fin elements 13 a are arranged so as to be spaced apart from each other and their plate surfaces are along the flow of air from the cooling fan 11.

  The heat pipe 12 is a heat transfer member that extends from the heat dissipation member 13 and transfers heat to the heat dissipation member 13. The heat pipe 12 has, for example, a working fluid therein, and moves heat between both end portions using heat of vaporization and capillary action. In addition, in this Embodiment, although the heat pipe 12 was used as a heat-transfer member, it is not limited to this, Other members with high heat conductivity may be sufficient. Moreover, in this Embodiment, although the cross section along F1-F1 line used the rectangular heat pipe 12, it is not limited to this. For example, the heat pipe 12 having a circular cross section along the line F1-F1 may be used.

  In the present embodiment, the heat pipe 12 extends on the circuit board 10 toward the left peripheral wall 6bc of the housing 6 along the positions of the heat generating components 31 and 33. The heat pipe 12 extending toward the left peripheral wall 6bc of the housing 6 until the circuit board 10 is removed is bent toward the heat radiating member 13. And the front-end | tip part of the heat pipe 12 extends along the exhaust port 11b of the cooling fan 11, and is skewering the several fin element 13a. In other words, the heat radiating member 13 is formed by fitting a plurality of fin elements 13 a having an opening in the center to the heat pipe 12.

  The circuit board 10 has a plurality of heat generating components 31 and 33 mounted thereon. In the present embodiment, the heat generating component 31 is a component having the highest heat generation amount among the circuit components mounted on the circuit board 10, and is, for example, a CPU. Further, the heat generating component 33 is a component that generates less heat than the heat generating component 31, and is, for example, a graphic chip or various chip sets. In the present embodiment, the circuit board 10 on which two heat generating components are mounted will be described. However, two or more heat generating components can be mounted.

  The heat receiving members 20 and 23 are made of a metal having a high thermal conductivity, and between the heat generating components 31 and 33, a heat connecting member 32 such as grease or a thin heat transfer sheet having a high thermal conductivity. , 34 are placed on the heat generating parts 31 and 33 and have an insertion hole into which the heat pipe 12 is inserted.

  The heat receiving member 20 is fixed to the circuit board 10. In the present embodiment, the heat receiving member 20 is fixed to the circuit board 10 using a fixing tool 21. The fixture 21 includes a cover portion 21a that supports the heat receiving member 20, and leg portions 21b that extend from the cover portion 21a toward the circuit board 10 and are screwed to the circuit board 10. The position of the heat receiving member 20 is fixed by being sandwiched between the circuit board 10 and the fixture 21. Thereby, the gap between the heat receiving member 20 and the circuit board 10 is not vacant, and the heat generated from the heat generating component 31 can be transferred to the heat receiving member 20 more efficiently. The reason why the heat receiving member 23 is not fixed to the circuit board 10 is that when the heat receiving member 20 and the heat receiving member 23 have different heights on the circuit board 10, stress is applied if both are fixed. . Therefore, when the heat receiving member 20 and the heat receiving member 23 have substantially the same height on the circuit board 10, both may be fixed.

  Here, the detailed structure of the heat receiving members 20 and 23 is demonstrated using FIG. 4 and FIG. 4 is a cross-sectional view taken along line F2-F2 of the heat receiving member shown in FIG. FIG. 5 is a cross-sectional view taken along line F1-F1 of the heat receiving member shown in FIG.

  As shown in FIGS. 4 and 5, the heat receiving members 20 and 23 are holes into which the heat pipe 12 is inserted, and the insertion holes 41 in which a gap is formed between the inner wall surface 41 a of the hole and the heat pipe 12. Have. The gap formed between the inner wall surface 41 a of the insertion hole 41 and the heat pipe 12 is filled with thermally conductive grease 40. In the present embodiment, the heat receiving members 20 and 23 have the insertion hole 41 such that the rectangular cross section of the insertion hole 41 along the F1-F1 line surrounds the rectangular cross section of the heat pipe 12 along the F1-F1 line. Is provided. More specifically, when an external force is applied to the heat pipe 12, the insertion hole 41 having a larger cross section than the range in which the heat pipe 12 moves is provided in the extending direction of the heat pipe 12. The gap formed between the inner wall surface 41a of the insertion hole 41a and the heat pipe 12 is filled with the heat conductive grease without any gap. Thereby, the heat receiving members 20 and 23 and the heat pipe 12 are thermally connected. In the present embodiment, the heat receiving members 20 and 23 have the insertion holes 41 whose section along the line F1-F1 is rectangular, but the present invention is not limited to this. For example, if the cross section of the insertion hole 41 along the F1-F1 line is larger than the cross section of the heat pipe 12 along the F1-F1 line, the shape may be circular.

  Thus, according to the portable computer 1 according to the present embodiment, the heat radiating member 13, the heat pipe 12 that extends from the heat radiating member 13 and transfers heat to the heat radiating member 13, and the execution of the control process The circuit board 10 on which the plurality of heat generating components 31 and 33 that generate heat are mounted and the heat generating components 31 and 33 are placed with the heat connection members 32 and 34 interposed therebetween, and the heat pipe 12 is mounted. A plurality of heat receiving members 20 and 23 having insertion holes 41 to be inserted, and the heat receiving members 20 and 23 are thermally conductive in a gap formed between the inner wall surface 41a of the insertion hole 41 and the heat pipe 12. Since the grease 40 is filled, when an external force is applied to the heat pipe 12 having high rigidity, the force is not evenly transmitted to the heat receiving members 20 and 23, and at least one of the heat receiving members is generated. Since the leakage of the heat connecting members 32 and 33 interposed between the heat generating components 31 and 33 and the heat receiving members 20 and 23 due to the inclination with respect to the components can be prevented, the heat generated from the heat generating components 31 and 33 is generated. Heat can be transferred to the heat radiating member 13 by one heat pipe 12.

(Second Embodiment)
The portable computer according to the present embodiment includes a sealing member that fills a gap formed between the inner wall surface of the insertion hole and the heat transfer member at the insertion port and the outlet of the insertion hole of the heat reception member. It is possible to prevent leakage of the heat conductive grease filled in the gap formed between the inner wall surface of the member insertion hole and the heat transfer member. Since the configuration of the portable computer is almost the same as that of the first embodiment, only the processing of parts different from the first embodiment will be described.

  6 is a cross-sectional view taken along line F2-F2 of the heat receiving member shown in FIG. FIG. 7 is a cross-sectional view taken along line F1-F1 in the insertion port (or outlet) of the insertion hole provided in the heat receiving member shown in FIG. As shown in FIGS. 6 and 7, the heat receiving members 20 and 23 fill a gap formed between the inner wall surface 41 a of the insertion hole 41 and the heat pipe 12 at the insertion port 61 and the outlet 62 of the insertion hole 41. A sealing member 60 is provided. Here, the sealing member 60 prevents leakage of thermally conductive grease filled in a gap formed between the inner wall surface 41a of the insertion hole 41 and the heat pipe 12, such as a rubber member or an O-ring. is there.

  FIG. 8 is an explanatory view showing an example of a manufacturing method of the heat receiving member shown in FIGS. 6 and 7. In this embodiment, as shown in FIG. 8, the heat pipe 12 is inserted into the insertion hole 41 and the gap formed between the inner wall surface 41 a of the insertion hole 41 and the heat pipe 12 is filled with heat conductive grease. After that, the heat receiving member 20 is fitted by fitting the sealing member 60 (for example, O-ring) into the grooves dug in accordance with the shape of the O-ring formed in the insertion port 51 and the outlet 62 of the insertion hole 41, respectively. , 23 is manufactured.

  As described above, according to the portable computer 1 according to the present embodiment, the heat conductive grease 40 filled in the heat receiving members 20 and 23 is sealed in the heat receiving members 20 and 23 by the sealing member 60. Since the heat conductive grease 40 can be prevented from leaking from the heat receiving members 20 and 23 when the heat pipe 12 moves in the insertion hole 41, the heat received by the heat receiving members 20 and 23 from the heat generating components 31 and 33. Can be transmitted to the heat pipe 12.

(Third embodiment)
In the portable computer according to the present embodiment, the heat receiving member is divided into an upper member and a lower member with the insertion hole interposed therebetween, and in addition to the insertion port and outlet of the insertion hole, the space between the upper member and the lower member is sealed. By stopping, the same effect as the portable computer according to the second embodiment is obtained. Since the configuration of the portable computer is almost the same as that of the second embodiment, only the processing of the parts different from the second embodiment will be described.

  FIG. 9 is a cross-sectional view taken along line F2-F2 of the heat receiving member shown in FIG. 10 is a cross-sectional view taken along line F1-F1 at the insertion port (or outlet) of the insertion hole provided in the heat receiving member shown in FIG. FIG. 11 is a top view of the heat receiving member before the upper member is attached. As shown in FIGS. 9 to 11, the heat receiving members 20 and 23 are divided into an upper member 91 and a lower member 92 with the insertion hole 41 interposed therebetween. The heat receiving members 20 and 23 are formed by the gap formed between the inner wall surface 41a of the insertion port 61 and the heat pipe 12 at the insertion port 61 and the outlet 62 of the insertion hole 41, and between the upper member 91 and the lower member 92. A rubber member 90 is provided to fill the gap. Here, the rubber member 90 includes two sealing members 60 attached to the insertion port 61 and the outlet 62 of the insertion hole 41 of the heat receiving members 20 and 23 used in the second embodiment, and an upper member in the insertion hole 41. The rubber member 90 for preventing leakage of the heat conductive grease 40 from the joint of the lower member 92 and the lower member 92 is integrally formed.

  FIG. 12 is an explanatory view showing an example of a method for manufacturing the heat receiving member shown in FIGS. In the present embodiment, as shown in FIG. 12, first, the rubber member 90 is fitted into the grooves 1201 and 1202 of the lower member 92. Next, the rubber member 90 attached to the lower member 92 is fitted into the grooves 1203 and 1204 of the upper member 91, and the rubber member 90 located at the joint between the upper member 91 and the lower member 92 in the insertion hole 41 is further inserted. It is sandwiched between the upper member 91 and the lower member 92. Next, after the thermal conductive grease 40 is filled into the heat receiving members 20 and 23 from the hole of the rubber member 90 into which the heat pipe 12 is inserted, the heat pipe 12 is inserted from the hole of the rubber member 90 on the insertion port 61 side of the insertion hole 41. The heat receiving members 20 and 23 are manufactured by inserting.

  As described above, according to the portable computer 1 according to the present embodiment, the heat receiving members 20 and 23 are divided into the upper member 91 and the lower member 92 with the insertion hole 41 interposed therebetween. And a rubber member 90 that fills a gap formed between the inner wall surface 41a of the insertion hole 41 and the heat pipe 12 at the outlet 62 and between the upper member 91 and the lower member 92, thereby providing the second embodiment. The same effects as those of the portable computer 1 can be obtained.

1 is a perspective view of a portable computer according to a first embodiment. It is a perspective view which shows the inside of the housing | casing of the portable computer concerning 1st Embodiment. It is the side view which looked at the components mounted in a circuit board from the side. It is sectional drawing which follows the F2-F2 line of the heat receiving member shown by FIG. It is sectional drawing which follows the F1-F1 line | wire of the heat receiving member shown by FIG. It is sectional drawing which follows the F2-F2 line of the heat receiving member shown by FIG. It is sectional drawing which follows the F1-F1 line | wire in the insertion port (or exit) of the insertion hole with which the heat receiving member shown by FIG. 2 is provided. It is explanatory drawing which shows an example of the manufacturing method of the heat receiving member shown to FIG. 6 and FIG. It is sectional drawing which follows the F2-F2 line of the heat receiving member shown by FIG. It is sectional drawing which follows the F1-F1 line | wire in the insertion port (or exit) of the insertion hole with which the heat receiving member shown by FIG. 2 is provided. It is a top view of the heat receiving member before attaching an upper member. It is explanatory drawing which shows an example of the manufacturing method of the heat receiving member shown to FIGS.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Portable computer 2 Main body 3 Display unit 4 Main body base 5 Main body cover 6 Case 6a Upper wall 6b Peripheral wall 6c Lower wall 6ba Front peripheral wall 6bb Rear peripheral wall 6bc Left peripheral wall 6bd Right peripheral wall 7 Keyboard 8 Display housing 8a Opening part 9 Liquid crystal display panel 9a Display screen 10 Circuit board 11 Cooling fan 11a Intake port 11b Exhaust port 12 Heat pipe 13 Heat radiation member 13a Fin element 20, 23 Heat receiving member 21 Fixing tool 21a Cover portion 21b Leg portion 22 Exhaust hole 31, 33 Heat generating component 32, 34 Thermal connection Member 40 Thermally conductive grease 41 Insertion hole 41a Inner wall surface 60 Sealing member 61 Insertion port 62 Exit 90 Rubber member 91 Upper member 92 Lower member 1201-1204 Groove

Claims (8)

A heat dissipating member that dissipates heat;
A heat transfer member that extends from the heat dissipation member and transfers heat to the heat dissipation member;
A circuit board on which a plurality of heat generating components that generate heat are mounted;
A plurality of heat receiving members mounted with a heat connection member interposed between each of the heat generating components and having an insertion hole for inserting the heat transfer member;
The electronic device, wherein the heat receiving member is filled with a heat conductive grease in a gap formed between an inner wall surface of the insertion hole and the heat transfer member.   The heat receiving member further includes a sealing member that fills a gap formed between an inner wall surface of the insertion hole and the heat transfer member at an insertion port and an outlet of the insertion hole. 1. The electronic device according to 1.   The electronic device according to claim 2, wherein the sealing member is a rubber member.   The electronic device according to claim 2, wherein the sealing member is an O-ring.   The heat receiving member is further divided into an upper member and a lower member across the insertion hole, and is formed between the inner wall surface of the insertion port and the heat transfer member at the insertion port and the outlet of the insertion hole. The electronic apparatus according to claim 1, further comprising a rubber member that fills a gap between the upper member and the lower member.   The electronic apparatus according to claim 1, wherein one heat receiving member of the plurality of heat receiving members is fixed to the circuit board.   The heat generation amount of the heat generating component on which the heat receiving member fixed to the circuit board is placed is larger than the heat generation amount of the heat generating component on which another heat receiving member is mounted. Electronic equipment. A heat dissipating member that dissipates heat;
A heat transfer member that extends from the heat dissipation member and transfers heat to the heat dissipation member;
A plurality of heat generating components that generate heat;
A plurality of heat receiving members mounted with a heat connection member interposed between each of the heat generating components and having an insertion hole for inserting the heat transfer member;
The printed circuit board, wherein the heat receiving member is filled with a heat conductive grease in a gap formed between an inner wall surface of the insertion hole and the heat transfer member.

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