JP2014116335A - Portable electronic apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a portable electronic apparatus in which heat dissipation efficiency is improved while maintaining waterproofness of the apparatus.SOLUTION: The portable electronic apparatus comprises a casing 20, a heating component 61 and a head conduction member 50. The casing 20 includes a casing opening 21. An upper case 30 includes a first annular recess 31 and a lower case 40 includes a second annular recess 41. The heat conduction member 50 integrally includes: a contact part 51 in contact with the heating component 61; an annular partition part 52 partitioning a space within the casing 20 into an accommodation space 22 for accommodating the heating component 61 and a heat dissipation space 23 communicating to the casing opening 21; a first annular seal part 53; and a second annular seal part 54. The upper case 30 and the lower case 40 are fixed to each other in the state where the first annular seal part 53 is fitted in the first annular recess 31 and the second annular seal part 54 is fitted in the second annular recess 41.

Description

  The present invention relates to a portable electronic device, and more particularly to a portable electronic device having a heat dissipation structure and a waterproof structure.

  In general, large electronic devices such as personal computers use a heat dissipation structure that releases heat generated from heat-generating components such as a CPU by mounting a blower fan inside the device and providing a vent in the housing. It has been.

  However, in a small portable electronic device as disclosed in Patent Document 1 or the like, it is difficult to mount a blower fan from the viewpoint of miniaturization of the device, and from the viewpoint of ensuring the waterproofness of the device. Often, the inside of a device is completely sealed by a housing.

  Therefore, in a small portable electronic device, as in the reference example shown in FIG. 6, the chassis 150 having high thermal conductivity that supports the substrate 160 and the like is provided in the housing 120 without providing a vent hole in the housing 120. The heat-generating component 161 is brought into contact with the heat-dissipating component 161 and heat is radiated to the space 124 in the housing 120 to dissipate heat from the heat-generating component 161.

JP 2012-227850 A

  However, the heat generation amount of the entire substrate 160 has increased with the increase in CPU speed and multifunctionality in portable electronic devices, and the interior of the device is a resin-like casing having low thermal conductivity from the viewpoint of waterproof performance. Since the structure is completely sealed at 120, there is no thermal convection with the outside air, the heat radiated from the chassis 150 cannot be efficiently discharged to the outside, and as a result, the equipment is operated for a long time There has been a problem that the ambient temperature in the casing 120 is increased, causing a failure.

  Therefore, the present invention solves the conventional problems, that is, an object of the present invention is to provide a portable electronic device with good heat dissipation efficiency while maintaining the waterproofness of the device.

  The portable electronic device of the present invention is a portable electronic device having waterproof properties, a casing including an upper case and a lower case, a heat generating component accommodated in the casing, and heat accommodated in the casing. A conductive member, the housing has a housing opening that opens to the outside, the upper case has a first annular recess on a surface facing the lower case, and the lower case The surface facing the upper case has a second annular recess, and the heat conducting member has a contact portion that directly or indirectly contacts the heat generating component, and a space in the housing, the heat generating member. An annular partition portion that partitions into a housing space for housing components and a heat radiating space that communicates with the housing opening, a first annular seal portion formed on the upper case side, and a second formed on the lower case side With an annular seal part The upper case and the lower case have the first annular seal portion fitted into the first annular recess of the upper case and the second annular recess of the lower case. The above-described problems are solved by securing the waterproofness between the annular partitioning portion and the housing by being fixed to each other in a state where the annular seal portion is fitted.

  The term “annular” as used in the present invention means a shape such as a quadrangular ring or an annular shape in which one end and the other end are connected and are not limited to an annular shape.

  In the portable electronic device of the present invention, the heat of the heat generating component can be transmitted to the heat conducting member, and the heat transmitted to the heat conducting member can be released to the outside through the opening of the housing. The heat dissipation efficiency can be improved without squeezing, and the waterproof property of the portable electronic device can be maintained by the seal structure formed between the upper case, the lower case, and the heat conducting member.

It is a perspective view which shows the portable electronic device which is one Embodiment of this invention. It is sectional drawing which shows a portable electronic device. FIG. 3A is a partially enlarged explanatory view of FIG. 2, FIG. 3A is an enlarged explanatory view of portion A in FIG. 2, and FIG. is there. FIG. 5 is a perspective view schematically showing a chassis, a first annular seal member, and a second annular seal member. It is explanatory drawing explaining the thermal radiation path | route in a portable electronic device. It is explanatory drawing explaining the thermal radiation path | route in the portable electronic device which is a reference example.

  Hereinafter, a portable electronic device according to an embodiment of the present invention will be described with reference to the drawings.

  As shown in FIGS. 1 and 2, the portable electronic device 10 includes a housing 20 that houses various components, a chassis 50 that is housed in the housing 20, and a housing 50 that is housed in and supported by the chassis 50. A substrate 60 to be mounted, a heat generating component 61 mounted on the substrate 60, a display 70 accommodated in the housing 20 and supported by the chassis 50, and the upper case 30 and the chassis 50 constituting the housing 20. A first annular seal member 80 for sealing, and a second annular seal member 90 for sealing between the lower case 40 and the chassis 50 constituting the housing 20 are provided.

  As shown in FIG. 1 and FIG. 2, the housing 20 includes an upper case 30 and a lower case 40. A case other than the upper case 30 and the lower case 40 may be provided.

  As shown in FIGS. 1 and 2, the housing 20 has a plurality of housing openings 21 that are open to the outside and for releasing the heat in the housing 20 to the outside. In the present embodiment, as shown in FIG. 1 and FIG. 2, the housing opening 21 is formed between the upper case 30 and the lower case 40, but either the upper case 30 or the lower case 40. The housing opening 21 may be formed by making a hole, or the housing opening 21 may be formed by making a hole in either the upper case 30 or the lower case 40. In the present embodiment, as shown in FIGS. 1 and 2, the housing opening 21 is formed in a slit shape, but the specific shape of the housing opening 21 is any shape such as a round hole. It may be a shape. Further, the size of the housing opening 21 may be any size as long as the user's fingers do not enter such that the user's fingers do not touch the chassis 50.

  As shown in FIG. 2, the space in the housing 20 includes a housing space 22 for housing the substrate 60, the heat generating component 61, and the like and a heat radiating space that leads to the housing opening 21 by an annular partition 52 of the chassis 50 described later. 23.

  The upper case 30 is made of a resin having a low thermal conductivity. As shown in FIGS. 2 and 3, the upper case 30 includes a first annular recess 31 formed on a surface of the upper case 30 facing the lower case 40 and a display opening for exposing the display 70 to the outside. Part 32. The first annular recess 31 is formed in an annular shape when viewed in the direction in which the upper case 30 and the lower case 40 are assembled close to each other.

  The lower case 40 is made of a resin having a low thermal conductivity. As shown in FIGS. 2 and 3, the lower case 40 has a second annular recess 41 formed on a surface of the lower case 40 facing the upper case 30 side. The second annular recess 41 is formed in an annular shape when viewed in the direction in which the upper case 30 and the lower case 40 are assembled close to each other.

  The upper case 30 and the lower case 40 are fixed to each other by a fixing component (not shown) such as a screw. Note that any method may be used for fixing the upper case 30 and the lower case 40.

  The chassis 50 is made of a metal having high thermal conductivity such as aluminum. As shown in FIG. 2, the chassis 50 is housed in the housing 20 and is fixed to the housing 20 (the upper case 30 in the present embodiment).

  As shown in FIGS. 2 to 4, the chassis 50 integrally includes a plate portion 51, an annular partition portion 52, a first annular seal portion 53, and a second annular seal portion 54. In FIG. 4, illustrations of parts that are not directly related to the present invention such as screw holes of the chassis 50 are omitted.

  The plate part 51 is formed in a rectangular flat plate shape. As shown in FIG. 2, the plate portion 51 functions as a contact portion that comes into contact with the heat generating component 61 via the heat conductive sheet 62.

  As shown in FIG. 2, the annular partitioning portion 52 is a part that partitions the space in the housing 20 into the accommodation space 22 and the heat dissipation space 23 described above. The annular partition 52 is formed in an annular shape on the peripheral edge of the chassis 50 when viewed in the direction in which the upper case 30 and the lower case 40 are assembled close to each other. As shown in FIG. 2, the annular partitioning portion 52 is disposed in the vicinity of the housing opening 21 and is exposed to the heat dissipation space 23 of the housing 20.

  As shown in FIGS. 2 to 4, the first annular seal portion 53 is annularly formed at the end of the annular partition portion 52 on the upper case 30 side, and is inserted into the first annular recess 31 of the upper case 30. It is a part to be fitted.

  As shown in FIGS. 2 to 4, the second annular seal portion 54 is formed in an annular shape at the end of the annular partition 52 on the lower case 40 side, and is inserted into the second annular recess 41 of the lower case 40. It is a part to be fitted.

  As shown in FIG. 2, the board 60 is a printed wiring board that is housed in the housing space 22 in the housing 20 and fixed to the chassis 50.

  As shown in FIG. 2, the heat generating component 61 is a component that is mounted on the substrate 60 and generates heat when energized. Specific examples of the heat generating component 61 include a CPU, a power supply unit, a wireless unit, and the like. In the present embodiment, the heat generating component 61 is in contact with the plate portion 51 of the chassis 50 via a heat conductive sheet 62 such as a silicon sheet having high thermal conductivity and elasticity. Note that the heat-generating component 61 may be brought into direct contact with the plate portion 51 of the chassis 50 without using the heat conductive sheet 62.

  The display 70 is configured as an LCD (Liquid Crystal Display) with a touch panel 71. As shown in FIG. 1, the display 70 is fixed to and supported by the chassis 50.

  As shown in FIG. 4, the first annular seal member 80 and the second annular seal member 90 are annular seal parts formed from rubber or resin having elasticity. 2 and 3, the first annular seal member 80 is disposed at the bottom of the first annular recess 31 of the upper case 30, and the first annular seal 31 between the first annular recess 31 and the chassis 50 is provided. It is sandwiched between the part 53 in a compressed state. As shown in FIGS. 2 and 3, the second annular seal member 90 is disposed at the bottom of the second annular recess 41 of the lower case 40, and the second annular seal 41 and the second annular seal portion of the chassis 50. 54 in a compressed state.

  In the portable electronic device 10 of the present embodiment thus obtained, as shown in FIG. 5, the heat of the heat generating component 61 is transmitted to the chassis 50, and the heat transmitted to the chassis 50 is externally transmitted through the housing opening 21. The heat dissipation efficiency can be improved without spreading heat inside the housing 20, and the seal structure formed between the upper case 30, the lower case 40, and the chassis 50 can be used. The waterproof property between the annular partition 52 and the housing 20 can be secured, and the waterproof property of the portable electronic device 10 can be maintained.

Further, in the portable electronic device 10 of the present embodiment, the first annular recess 31 is formed on the surface of the upper case 30 facing the lower case 40, and the first annular recess 31 is formed in the first annular recess 31. The annular seal portion 53 is fitted, and a second annular recess 41 is formed on the surface of the lower case 40 facing the upper case 30, and the second annular seal portion of the chassis 50 is formed in the second annular recess 41. A seal structure for fitting 54 is employed.
As a result, when the portable electronic device 10 is assembled, the chassis 50 is disposed at a predetermined position between the upper case 30 and the lower case 40, and then the upper case 30 and the lower case 40 are brought close to each other. The first annular seal portion 53 of the chassis 50 is fitted into the first annular recess 31, and the second annular seal portion 54 of the chassis 50 is fitted into the second annular recess 41 of the lower case 40. Therefore, assembly of the seal structure can be easily achieved.

  Further, the first annular seal member 80 disposed at the bottom of the first annular recess 31 of the upper case 30 is replaced with the first annular recess 31 and the first annular seal portion 53 by the simple assembly as described above. And the second annular seal member 90 disposed at the bottom of the second annular recess 41 of the lower case 40 between the second annular recess 41 and the second annular seal portion 54. Therefore, reliable sealing performance can be obtained while realizing simple assembly.

  In the above description, only the seal structure formed between the upper case 30 and the lower case 40 and the chassis 50 related to the present invention has been described. However, other locations (for example, between the display 70 and the upper case 30). Since the well-known seal structure is used for the seal structure in the space and the fastening portion with screws), the description thereof is omitted.

DESCRIPTION OF SYMBOLS 10 ... Portable electronic device 20 ... Housing 21 ... Housing opening 22 ... Housing space 23 ... Heat radiation space 30 ... Upper case 31 ... First annular recess 32・ ・ ・ Display opening 40 ・ ・ ・ Lower case 41 ・ ・ ・ Second annular recess 50 ・ ・ ・ Chassis (heat conducting member)
51 ... Plate part (contact part)
52 ... Annular partition part 53 ... First annular seal part 54 ... Second annular seal part 60 ... Substrate 61 ... Heating component 62 ... Thermal conduction sheet (second heat Conductive member)
70 ... Display 71 ... Touch panel 80 ... First annular seal member 90 ... Second annular seal member

Claims (10)

A portable electronic device having waterproofness,
A housing including an upper case and a lower case, a heat generating component housed in the housing, and a heat conducting member housed in the housing,
The housing has a housing opening that opens to the outside,
The upper case has a first annular recess on a surface facing the lower case side,
The lower case has a second annular recess on a surface facing the upper case side,
The heat conducting member divides a contact portion that directly or indirectly contacts the heat generating component, and a space in the housing into a housing space that houses the heat generating component and a heat radiating space that communicates with the housing opening. An annular partition portion, a first annular seal portion formed on the upper case side, and a second annular seal portion formed on the lower case side;
In the upper case and the lower case, the first annular seal portion is fitted in the first annular recess of the upper case, and the second annular recess is inserted in the second annular recess of the lower case. A portable electronic device, wherein a waterproof property is secured between the annular partition portion and the housing by being fixed to each other in a state where the seal portion is fitted. Comprising a substrate housed in the housing space of the housing;
The heat generating component is mounted on the substrate,
The portable electronic device according to claim 1, wherein the heat conducting member is a chassis that supports the substrate. A first annular seal member disposed at the bottom of the first annular recess of the upper case and sandwiched between the first annular recess and the first annular seal portion of the heat conducting member;
A second annular seal member disposed at the bottom of the second annular recess of the lower case and sandwiched between the second annular recess and the second annular seal portion of the heat conducting member;
The portable electronic device according to claim 1, further comprising:   4. The portable type according to claim 1, wherein the contact portion of the heat conducting member is in contact with the heat-generating component through a second heat conducting member. 5. Electronics.   The annular partition portion, the first annular seal portion, and the second annular seal portion of the heat conducting member are the heat when the upper case and the lower case are viewed close to each other and assembled. The portable electronic device according to any one of claims 1 to 4, wherein the portable electronic device is formed on a peripheral portion of the conductive member.   The portable electronic device according to any one of claims 1 to 5, wherein the housing opening is formed in a slit shape or a round hole shape.   The portable electronic device according to any one of claims 1 to 6, wherein the housing opening is formed between the upper case and the lower case. The first annular seal portion of the heat conducting member is formed at an end portion on the upper case side of the annular partition portion of the heat conducting member,
The said 2nd annular seal part of the said heat conductive member is formed in the edge part by the side of the said lower case of the said annular partition part of the said heat conductive member, The any one of Claim 1 thru | or 7 characterized by the above-mentioned. Item 1. A portable electronic device according to item 1.   The portable electronic device according to claim 1, wherein the heat conducting member is fixed to the upper case. A display housed in the housing and supported by the heat conducting member;
The portable electronic device according to any one of claims 1 to 9, wherein the upper case has a display opening that exposes the display to the outside.

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