JP2016045399A - Heat radiation structure and electronic apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To effectively perform heat radiation and temperature management of a heating element.SOLUTION: A heating element 5 and a battery unit 4 that are separately disposed in a housing 1 are connected by a heat conduction member 6. The thermistor of the battery unit 4 is served as the heating element 5 by radiating heat of the heating element 5 to the battery unit 4 via the heat conduction member 6. Specifically, the heating element 5 is arranged in the vicinity of the surface portion of the housing 1. The heating element 5 and the battery unit 4 are arranged such that difference in phase is almost 90°. The heating element 5 is an antenna module and the heat conduction member 6 is a conductive member.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a heat dissipation structure for a heating element and an electronic device including the heat dissipation structure.

In Patent Document 1, it is possible to ensure the strength of the case and reduce the thickness of the case by insert molding of metal and resin, while at the same time satisfying the demands for making the terminal thinner, smaller, lighter, and less expensive. A heat dissipating structure that makes it possible to realize heat dissipation and heat conduction is proposed.
The heat dissipation structure has a casing configured by insert molding of a metal part having high strength and high heat dissipation characteristics and a resin material. The heat radiating sheet includes a first sheet portion disposed in close contact with the electronic component serving as a heat generation source, a second sheet portion disposed in close contact with the insert-molded metal component, and the first sheet portion. The sheet portion and the connecting sheet portion for connecting the second sheet portion are integrated, and has a graphite material sheet having high thermal conductivity in a direction substantially perpendicular to the thickness direction.

JP 2008-177275 A

By the way, when an antenna module for communication such as WLAN (wireless LAN) or Bluetooth (registered trademark) is incorporated in an electronic device, two problems of heat generation / reception sensitivity of the antenna module are significant issues.
That is, when the antenna module generates heat, the internal / external temperature rises. In particular, the temperature rise of the appearance portion has a risk that the user will be burned at a low temperature.
In addition, if the reception sensitivity is poor, a communication failure occurs, and a user's use is adversely affected.

For this reason, when considering the arrangement place of the antenna module, it is preferable to keep the module itself away from the external appearance in order to prevent the temperature of the external appearance portion from rising.
On the other hand, when receiving sensitivity is considered, deterioration of receiving sensitivity can be prevented by placing the antenna at a position where there is no obstacle to radio waves in the surrounding area. Therefore, it is preferable to arrange the module at a position as close to the appearance as possible.

Also, when considering the material around the antenna module, it is possible to diffuse heat by making the appearance a metal material in order to lower the temperature of the appearance, but by making the appearance a metal, the antenna Will deteriorate the sensitivity.
On the other hand, when a material other than metal (such as a resin) is used for appearance, deterioration of sensitivity can be prevented, but heat transmitted to the appearance is not diffused, and only a part becomes hot.

Therefore, in order to make the structure that does not affect the sensitivity of the antenna, the module is arranged at a position close to the appearance.
In addition, it is necessary to adopt a structure in which heat is diffused inside without using a metal material for the external portion.

  However, when the antenna module is arranged at a position close to the appearance, if the size of the module itself is large, the appearance is affected. Or the position to arrange | position will be fixed.

  Further, in order to arrange the antenna module near the appearance without affecting the design design, it is important to reduce the size of the module.

  In the heat dissipation structure of Patent Document 1, since the heat dissipation sheet is in close contact with the electronic component and the metal component of the heating element, the arrangement is limited. Moreover, it is not assumed that the temperature of the electronic component that is a heat source is managed.

  An object of the present invention is to efficiently perform heat dissipation and temperature management of a heating element.

In order to solve the above problems, the present invention provides:
The heating element and the battery unit that are arranged apart from each other in the housing are connected by a heat conducting member,
The heat of the heating element is radiated to the battery part through the heat conducting member,
The temperature detection component of the battery unit is also used as the heating element.

  According to the present invention, it is possible to efficiently perform heat dissipation and temperature management of the heating element.

1 is a perspective view of a camera, showing a configuration of an embodiment of an electronic apparatus to which the present invention is applied. It is the front view (a) and side view (b) of the camera of FIG. It is the front view (a), top view (b), and side view (c) of the antenna module of FIG. 2, a battery part, and a heat conductive member. FIG. 3 is a perspective view of the camera body frame, the antenna module, the battery unit, and the heat conducting member of FIG. It is a bottom view of the heat conductive member of FIG.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the drawings.

(Key points)
By devising the arrangement of the antenna module for WLAN and the heat transfer path with internal components, it is possible to diffuse heat / shared use of electronic components / improve antenna sensitivity.
That is, the following advantages are obtained by devising a heat transfer path for the antenna module of the heat source located at a distant position.
1) By using a heat conductive member having high heat conductivity, heat dissipation and heat diffusion increase.
2) The GND of the antenna module can be enhanced by using the conductive member as the heat conductive member.
3) The temperature rise of the antenna module can be managed by the thermistor (temperature detection component) of the battery unit.

(Embodiment)
1 and 2 show a camera as a configuration of an embodiment of an electronic apparatus to which the present invention is applied. 1 is a first casing (camera body), and 2 is a second casing (monitor casing). Reference numeral 3 denotes a lens barrel, 4 denotes a battery unit, 5 denotes a heating element (antenna module), and 6 denotes a heat conducting member.

As shown in the figure, a monitor housing 2 as a second housing is hinged at the upper portion so as to be tilted up on the back side of the camera body 1 as the first housing.
The camera body 1 is provided with a lens barrel 3 containing a photographic lens on the front side, and a battery portion 4 is built on the opposite side of the lens barrel 3.

Here, in a compact digital still camera as shown in the figure, when attempting to mount an antenna module for WLAN without breaking the design design, it is necessary to mount a small antenna module.
Since the antenna module needs to be miniaturized, only the minimum necessary electronic components can be placed on the module.
Moreover, in order to improve the sensitivity of the antenna, it is necessary to arrange the antenna at a position close to the appearance.

Therefore, as shown in FIGS. 2A and 2B, the WLAN antenna module 5 as a heating element is provided in the camera body 1 at the bottom of the bottom case 1 a below the lens barrel 3 side. It arrange | positions so that it may follow along a part.
As described above, by arranging the antenna module 5 substantially along the bottom surface of the bottom case 1a close to the appearance of the camera body 1, radio waves are not hindered by other internal components, so that the antenna sensitivity can be improved. Deterioration does not occur.
Moreover, since both the bottom case 1a and the front case 1b are resin cases, they do not interfere with radio waves.

3A to 3C show the relationship between the antenna module 5, the battery unit 4, and the heat conducting member 6. As shown in the figure, the battery unit 4 includes a battery 4 a in a state where the plate surface is raised. It is covered with a cover member 4b.
As described above, the battery unit 4 and the antenna module 5 are arranged with a phase difference of approximately 90 °.

  FIG. 4 shows the frame 1c, the antenna module 5, the battery unit 4 and the heat conducting member 6 of the camera body 1 as viewed from the back side. In addition, a tripod hole member 1d is provided. A tripod hole for attaching a tripod (not shown) is formed in the tripod hole member 1d so as to open downward.

As shown in FIG. 5, when the heat conductive member 6 having high thermal conductivity approaches the antenna portion 5 a on the lower surface of the antenna module 5, the antenna sensitivity may be deteriorated. The antenna module 5 and the heat conducting member 6 are brought into close contact with each other at a position where the most area can be secured within a range that does not affect.
That is, one end portion 6a of the heat conducting member 6 is overlapped on the upper surface of the antenna module 5 and connected by bonding or the like.
Thereby, the path | route which moves the heat | fever produced by the heat_generation | fever of the antenna module 5 to the battery part 4 with a large heat capacity is securable.

In the embodiment, considering the amount of heat generated by the antenna module 5 and the heat conductivity of the heat conducting member 6, copper sheet metal (Cu C1100) is used as the material of the heat conducting member 6.
In addition, as a material of the heat conducting member 6, other metal such as aluminum sheet metal or magnesium die casting is used according to the heat generation amount of the antenna module 5, or a tape having high heat conductivity is pasted on the resin member. It is also conceivable to use other members.
At the same time, by making the heat conducting member 6 a conducting member that can conduct electricity, the GND of the antenna module 5 can be lowered, so that the GND is strengthened and an effect such as noise reduction is obtained.

Here, the temperature management of the antenna module 5 is preferably replaced by a thermistor mounted on another component or another substrate.
Therefore, the other end portion 6b of the heat conducting member 6 is overlapped with the lower end portion of the battery cover member 4b and connected by screw fastening or the like.

  A notch-shaped portion 6c that avoids the tripod hole member 1d is formed in the intermediate portion of the heat conducting member 6.

In the embodiment, fastening by screws is used at the place where the other end 6b of the heat conducting member 6 is connected to the battery cover member 4b. However, depending on the member and cost, welding, crimping, insert molding, or an integral member is used. It is good.
Thus, the heat of the antenna module 5 moves to the battery cover member 4b around the battery 4a through the connection portion between the heat conducting member 6 and the battery cover member 4b.
As a result, the antenna module 5 can generate heat and the ambient temperature of the battery 4a can be increased. Therefore, the thermistor built in the battery 4a is used to provide the antenna module. 5 temperature rise can be managed.
Since the antenna module 5 and the battery 4a are managed at different temperatures, it is preferable to perform management at a lower temperature including both, and in the embodiment, management is performed at the temperature of the battery 4a.

In the embodiment, a metal member (SPCC) is adopted as the material of the battery cover member 4b in consideration of thermal conductivity and cost.
As a material of the battery cover member 4b, a material having excellent thermal conductivity such as copper sheet metal or magnesium die casting or a member in which a tape having high thermal conductivity is attached to a resin case may be considered depending on conditions. .

By using the above heat dissipation structure, when comparing the ambient temperature of the antenna module 5 and the time required to reach the standard temperature for the battery 4a, the following favorable results were obtained.
1) Temperature rise of the antenna module 5 main body 15 times improvement 2) Temperature rise of the bottom case 1a nearest to the antenna module 5 4.5 times improvement 3) Temperature rise around the thermistor of the battery 4a 1.3 times

The effects obtained by the above heat dissipation structure of the camera are listed below.
1) Since it is not necessary to mount a thermistor on the antenna module 5, the antenna module 5 can be miniaturized.
2) Since the size of the antenna module 5 is reduced, the degree of freedom of the position where the antenna unit 5a is arranged is increased.
3) Since electronic components (thermistors) of the antenna module 5 can be reduced, cost / power consumption can be reduced.
4) Since the appearance of the camera body 1 can be made of resin parts, it is possible to expect weight reduction of the product / enhancement of antenna sensitivity / freedom of appearance shape.
5) Since the heat can be diffused, it is possible to alleviate temperature concentration.

As described above, according to the camera having the heat dissipation structure of the embodiment, the WLAN antenna module 5 and the battery unit 4 which are spaced apart from each other in the casing of the camera body 1 by approximately 90 ° are connected to the heat conducting member. 6, the heat generated by the antenna module 5 is radiated to the battery unit 4 via the heat conducting member 6, and the following effects are obtained.
1) It is possible to efficiently achieve both heat radiation of the antenna module 5 that performs communication and prevention of deterioration of reception sensitivity.
2) The degree of freedom of component placement is high.
3) Since the thermistor of the battery 4a is sufficient as the thermistor, the number of parts can be reduced.

More specifically, the following effects can be obtained.
1) By releasing the heat generation of the antenna module 5 to the battery unit 4 at a remote position via the heat conductive member 6 made of copper sheet metal, it is possible to achieve both heat radiation of the antenna module 5 and prevention of lowering of reception sensitivity.
2) The thermistor of the antenna module 5 can be omitted by sharing the thermistor of the battery 4a.
3) Since the antenna module 5 is disposed at the bottom of the bottom case 1a of the camera body 1, the heat conducting member 6 can avoid the tripod hole member 1d by the notch-shaped portion 6c.
4) Since the positional relationship between the antenna module 5 and the battery unit 4 is rotated by 90 °, the housing of the camera body 1 can be thinned.

(Modification)
In the above embodiment, the camera is used. However, the present invention is not limited to this, and may be another electronic device such as a mobile phone including the camera.
In the embodiment, the heating element is an antenna module, but the heating element may be another electronic component such as an image processing module.
Furthermore, the shape of the heating element and the heat conducting member is arbitrary, and it is needless to say that other specific detailed structures can be appropriately changed.

As mentioned above, although several embodiment of this invention was described, the scope of the present invention is not limited to the above-mentioned embodiment, The range of the invention described in the claim, and its equivalent range Including.
The invention described in the scope of claims attached to the application of this application will be added below.
The item numbers of the claims described in the appendix are as set forth in the claims attached to the application of this application.
[Appendix]
<Claim 1>
The heating element and the battery unit that are arranged apart from each other in the housing are connected by a heat conducting member,
The heat of the heating element is radiated to the battery part through the heat conducting member,
A heat dissipation structure characterized in that the temperature detection component of the battery unit is also used for the heating element.
<Claim 2>
The heat dissipation structure according to claim 1, wherein the heating element is disposed in the vicinity of a surface portion of the casing.
<Claim 3>
3. The heat dissipation structure according to claim 1, wherein the heating element and the battery unit are arranged with a phase difference of about 90 °.
<Claim 4>
The heat dissipation structure according to any one of claims 1 to 3, wherein the heating element is an antenna module.
<Claim 5>
The heat dissipation structure according to claim 4, wherein the heat conducting member is also a conducting member.
<Claim 6>
Two heating elements that need to be temperature-controlled are placed apart from each other in the housing,
These two heating elements are connected by a heat conducting member,
A heat-dissipating structure characterized in that a temperature detection component common to the two heat generating elements is provided at any position of the two heat generating elements and the heat conducting member.
<Claim 7>
The two heating elements have different management temperatures or heat capacities,
The heat dissipation structure according to claim 6, wherein the temperature detection component is provided at a position close to a heating element having a lower management temperature.
<Claim 8>
The two heating elements have different management temperatures or heat capacities,
The heat dissipation structure according to claim 6, wherein the temperature detection component is provided at a position close to a heating element having a larger heat capacity.
<Claim 9>
The heat dissipating structure according to claim 8, wherein the heat generating element with the smaller heat capacity is disposed near the surface of the casing, and the heat generating element with the larger heat capacity is disposed inside the casing.
<Claim 10>
The heat dissipation structure according to any one of claims 1 to 9,
The electronic device according to claim 1, wherein the heating element and the heat conducting member are disposed at a bottom portion of the casing.
<Claim 11>
A photographic lens provided at the front of the housing;
A tripod hole provided at the bottom of the housing,
The electronic device according to claim 10, wherein a shape portion that avoids the tripod hole is formed in the heat conducting member.

DESCRIPTION OF SYMBOLS 1 Case 1a Bottom case 1b Front case 1c Frame 1d Tripod hole member 2 Case 3 Lens barrel 4 Battery part 4a Battery 4b Battery cover member 5 Heating element (antenna module)
5a Antenna part 6 Thermal conduction member (conduction member)
6a Connection end 6b Connection end 6c Shaped part to avoid tripod hole

Claims (11)

The heating element and the battery unit that are arranged apart from each other in the housing are connected by a heat conducting member,
The heat of the heating element is radiated to the battery part through the heat conducting member,
A heat dissipation structure characterized in that the temperature detection component of the battery unit is also used for the heating element.   The heat dissipation structure according to claim 1, wherein the heating element is disposed in the vicinity of a surface portion of the casing.   3. The heat dissipation structure according to claim 1, wherein the heating element and the battery unit are arranged with a phase difference of about 90 °.   The heat dissipation structure according to any one of claims 1 to 3, wherein the heating element is an antenna module.   The heat dissipation structure according to claim 4, wherein the heat conducting member is also a conducting member. Two heating elements that need to be temperature-controlled are placed apart from each other in the housing,
These two heating elements are connected by a heat conducting member,
A heat-dissipating structure characterized in that a temperature detection component common to the two heat generating elements is provided at any position of the two heat generating elements and the heat conducting member. The two heating elements have different management temperatures or heat capacities,
The heat dissipation structure according to claim 6, wherein the temperature detection component is provided at a position close to a heating element having a lower management temperature. The two heating elements have different management temperatures or heat capacities,
The heat dissipation structure according to claim 6, wherein the temperature detection component is provided at a position close to a heating element having a larger heat capacity. The heat dissipating structure according to claim 8, wherein the heat generating element having the smaller heat capacity is disposed near the surface of the casing, and the heat generating element having the larger heat capacity is disposed inside the casing. The heat dissipation structure according to any one of claims 1 to 9,
The electronic device according to claim 1, wherein the heating element and the heat conducting member are disposed at a bottom portion of the casing. A photographic lens provided at the front of the housing;
A tripod hole provided at the bottom of the housing,
The electronic device according to claim 10, wherein a shape portion that avoids the tripod hole is formed in the heat conducting member.

Images