JP2020008696A - Electronic apparatus - Google Patents

Abstract

To provide an electronic apparatus that has a flow passage penetrating a camera body so as to provide efficient heat discharge means while preventing dust etc., from entering the inside, and can reduce heat conduction to an outer sheath while conducting heat from a heating source to a center part thereof.SOLUTION: An electronic apparatus comprises a main-body outer sheath which is provided with an exhaust hole on a top surface side and a suction hole on a reverse surface side; a substrate which is mounted with an electronic component as a heat generating source; a hollow first cylindrical member which is arranged on a suction hole side; a hollow second cylindrical member which is arranged on an exhaust hole side; and a hollow third cylindrical member which is arranged between the first cylindrical member and the second cylindrical member, and made of a material having higher heat conductivity than the first cylindrical member and the second cylindrical member, in which the suction hole, the first cylindrical member, the third cylindrical member, the second cylindrical member, and the exhaust hole connect with one another to form a flow passage for air, and the electronic component as the heat generating source on the substrate is thermally connected to the third cylindrical member.SELECTED DRAWING: Figure 3

Description

  The present invention relates to electronic devices such as digital cameras and digital video cameras, and more particularly to an imaging device having a heat dissipation structure.

  2. Description of the Related Art Conventionally, digital cameras are capable of shooting not only still images but also moving images. Furthermore, in recent years, it has become possible to shoot a moving image with a higher resolution, for example, a 4K moving image, but at the same time, the load on an element on a control board such as a CPU is increased, and heat is generated more intensely than before. . Therefore, in order to prevent the user from feeling uncomfortable when the temperature of the digital camera main body becomes high, there is a control in which a photographing time is limited to suppress a rise in the temperature of the digital camera main body.

  Further, as a more effective heat radiation method, a method has been proposed in which a vent hole is provided in a digital camera body, the inside of the digital camera body is communicated with a cylinder, and heat from a heat source is radiated to external air passing through the cylinder. (Patent Document 1). In this proposal, heat from a heat source is radiated to the outside air through the cylindrical body before spreading inside the digital camera body. Therefore, a higher heat dissipation effect can be expected as compared with a case where heat dissipation measures are taken only inside the digital camera body, and further, dustproofness is considered because the ventilation holes are communicated with the cylindrical body.

  Then, the material of the cylindrical body is such that the exhaust hole side is a material having high thermal conductivity and the intake side is a material having low thermal conductivity, and a heat insulating material is disposed between the exhaust hole and the cylindrical body. This prevents the temperature around the intake hole and the exhaust hole from rising too much. By doing so, the user does not feel discomfort even when touching the vicinity of the intake hole and the exhaust hole.

JP 2006-85002 A

  However, in Patent Document 1 described above, a heat insulating material is arranged between the cylindrical body having a high thermal conductivity and the exhaust hole. However, if a suitable thickness is not ensured, the vicinity of the exhaust hole may be reduced. It is difficult to completely insulate heat. Therefore, heat is also transmitted around the exhaust hole, and the user may feel discomfort. Further, if the thickness of the heat insulating material is increased without changing the size of the digital camera body to completely insulate the heat, the cylindrical body is shortened, and the heat radiation effect is sacrificed.

  An object of the present invention is to provide an imaging device having a high heat radiation effect by a hole penetrating a main body, hardly transmitting heat to the vicinity of an exhaust hole, and having a dustproof property.

In order to achieve the above object, an imaging device according to the present invention includes:
A body exterior in which an exhaust hole is provided on an upper surface side, and an intake hole is provided on a lower surface side, a substrate on which an electronic component serving as a heat source is mounted, and a hollow first tubular member arranged on the intake hole side; A second hollow cylindrical member disposed on the exhaust port side, and the first cylindrical member disposed between the first cylindrical member and the second cylindrical member; and A hollow third cylindrical member made of a material having a higher thermal conductivity than the second cylindrical member, wherein the air intake hole, the first cylindrical member, the third cylindrical member, the third cylindrical member; The second cylindrical member and the exhaust hole are connected to form an air flow path, and an electronic component serving as a heat source on the substrate is thermally connected to the third cylindrical member. It is characterized by.

  According to the present invention, it is possible to provide an imaging device that has a high heat radiation effect due to the hole penetrating the main body, does not easily conduct heat to the vicinity of the exhaust hole, and has a dustproof property.

1 is an external perspective view of an imaging device as an electronic apparatus according to the invention. It is a disassembled perspective view of a cylindrical member. It is sectional drawing of the cylindrical member part of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIGS. 1A and 1B are a perspective view and a perspective view of an imaging device 1 according to an embodiment of the present invention as viewed from the front and the bottom, respectively.

  As shown in FIG. 1A, an imaging apparatus 1 of the present embodiment is provided with a lens unit 2 for forming a subject image on the front side, and the formed subject image is converted into electronic data by an image sensor (not shown). Is converted to A CPU 31 mounted on a control board 30 described below stores the converted electronic data in a memory (not shown) and displays a subject image being captured on a display unit 6 described later. Control. In particular, since the above-described control is continuously performed during moving image shooting, when a high-resolution moving image is shot, the load on the CPU 31 is increased, and the amount of heat generation is significantly increased. The internal structures such as the image sensor and the control board 30 are covered and protected by the outer cover 4.

  On the upper surface of the imaging device 1, an opening of the exhaust hole 11 and a release button 2 that starts a shooting operation by being operated are provided. Further, a mode dial 3 is provided which can be switched between a shooting mode such as an aperture-priority automatic exposure mode, a shutter speed-priority automatic exposure mode, a manual exposure mode in which a user sets an aperture value and a shutter speed, and a movie shooting mode by rotating. Have been.

  As shown in FIG. 1B, on the back side of the imaging apparatus 1, an operation that allows the user to call a function assigned to each of them by pressing down, for example, a menu screen or switching to a playback mode. Button 7 is provided. A display unit 6 is provided next to the display unit, and displays the menu screen, the image in the reproduction mode, and other various information. When a menu screen is selected by the operation button 7 and each item of the menu is displayed on the display unit 6, an annular direction button 8 is provided to enable selection of each item. Further, a determination button 9 for executing the selected item is provided inside the selection button. An opening of the intake hole 10 is provided on the bottom surface.

  FIG. 2 is an exploded perspective view of the above-described tubular member in the present embodiment, and FIG. 3 is a cross-sectional view of a state where the tubular member is configured in the outer cover.

  In FIG. 2, reference numerals 20, 21, and 22 denote a first tubular member, a second tubular member, and a third tubular member, respectively, which are hollow tubular. On the upper surface side of the first cylindrical member 20 in the drawing, a concave shape 20a is formed on the inner peripheral wall side. Similarly, a concave shape 21a is formed on the inner peripheral wall side on the lower surface side of the second cylindrical shape 21 in the drawing. A convex shape 22a is formed on the inner peripheral wall side on each of the upper and lower sides of the third cylindrical member 22 in the drawing, and the concave shape 20a and the concave shape 21a can be fitted respectively. The first tubular member 20 is shorter than the second tubular member 21.

  As a material of the third tubular member 22, a material having a high thermal conductivity such as a metal such as aluminum or copper is used. The first tubular member 20 and the second tubular member 21 have a lower thermal conductivity than the third tubular member 22. For example, in the present invention, a resin such as PC Material. Further, since the first tubular member 20 and the second tubular member 21 are not heat insulating materials, a certain amount of heat is transmitted from the third tubular member 22.

  In FIG. 3, the first cylindrical member 20, the third cylindrical member 22, and the like from the intake hole 10, which is an opening on the bottom surface, to the exhaust hole 11, which is an opening on the top surface. And the second tubular member 21 in this order. Therefore, the opening of the intake hole 10, the hollow portion 20b of the first tubular member 20, the hollow portion 22b of the third tubular member 22, the hollow portion 21b of the second tubular member 21, and The outside air of the imaging device 1 can pass through the opening of the exhaust hole 11. Further, the third tubular member 22 is located substantially at the center in the vertical direction of the imaging device 1, and the first tubular member 20 is shorter than the second tubular member 21. The third cylindrical member 22 is located substantially below the center from below.

  On the CPU 31 mounted on the control board 30 described above, a heat conductive rubber 32 for transmitting heat to other components is arranged, and the heat conductive rubber 32 is in contact with the third tubular member 22. . Therefore, the heat generated by the CPU 31 is transmitted to the third tubular member 22 through the heat conductive rubber 32. However, since the first tubular member 20 and the second tubular member 21 have a lower thermal conductivity than the third tubular member 22, heat is transmitted, but the third tubular member 22. The temperature is lower than.

  When the temperature of the third cylindrical member 22 increases, the temperature of the air in the hollow portion 22b increases. Then, the density of the air in the hollow portion 22 b becomes lower than that of the outside, so that buoyancy is generated, and the air rises and is exhausted from the exhaust hole 11. Accordingly, the pressure of the air in the hollow portions 20b, 21b, and 22b becomes lower than that of the external air near the intake hole 10, and a pressure difference is generated. Is sucked. As long as the CPU 31 continues to generate heat, the above-described intake and exhaust continue to be generated continuously. Although the heat inside the imaging device 1 is transmitted to a certain extent to the first tubular member 20, the third tubular member 22 is located substantially below the center of the imaging device 1 from below. The time when the air sucked from the air inlet 10 passes through the hollow portion 20b is shortened. Therefore, the air sucked from the suction hole 10 is less affected by the heat radiation from the hollow portion 20b and passes through the hollow portion 22b at almost the outside temperature. Well done.

  As described above, the heat inside the main body can be radiated from the third cylindrical member 22 to the outside air, and further, the first cylindrical member 20 and the second cylindrical member 21 are also radiated. By transmitting heat, heat is spread over a wider area.

  Since the first tubular member 20b and the second tubular member 21b are made of a material having a lower thermal conductivity than the third tubular member 22, the third tubular member 22 is directly As compared with the case where the outer peripheral cover 4 is adjacent to the outer cover 4, the surroundings of the intake hole 10 and the exhaust hole 11 are prevented from becoming hot. External air passes from the intake hole 10 to the exhaust hole 11, but is imaged by the first tubular member 20, the second tubular member 21, and the third tubular member 22. Since a space independent of the inside of the main body of the device 1 is formed, entry of dust and water into the inside is prevented. Further, an elastic body (not shown) is interposed between the first cylindrical member 20, the second cylindrical member 21, the third cylindrical member 22, the intake hole 10, and the exhaust hole 11. By doing so, it is possible to seal and to surely prevent dust and water from entering the inside of the imaging device 1.

  Here, the CPU 31 is taken as an example of the heating element. However, if other electric elements that generate heat or heat generation of the display unit 6 is a problem, each heating element and the third tubular member 22 are connected. The connection may be made thermally.

  It is also conceivable that the hollow portion 22b of the third tubular member 22 is coated or coated with good heat dissipation to further enhance the heat dissipation effect.

  Further, a rod-shaped heat storage member having a high cooling effect (not shown) is inserted from the intake hole 10 or the exhaust hole 11 and is brought into contact with the hollow portion 22 (b) of the third tubular member 22, thereby providing an external device. Instead of radiating the heat to the air, the heat of the imaging device may be directly transmitted to the heat storage member. This makes it possible to obtain a cooling effect even when the external air is hot, such as in a hot environment. In addition, by exchanging the heat storage member at appropriate times, it is possible to continuously discharge the heat of the imaging device.

1 imaging device, 2 lens unit, 3 release button, 4 outer cover,
5 mode dial, 6 display, 7 operation buttons, 8 direction buttons,
9 enter button, 10 intake hole, 11 exhaust hole, 20 first cylindrical member,
20a convex shape, 20b hollow portion, 21 second cylindrical member, 21a concave shape,
21b hollow portion, 22 third cylindrical member, 22a convex shape, 22b hollow portion,
30 control board, 31 CPU, 32 thermal conductive rubber

Claims (4)

A body exterior (4) having an exhaust hole (11) on the upper surface side and an intake hole (10) on the lower surface side;
A substrate (30) on which an electronic component (31) serving as a heat source is mounted;
A first hollow cylindrical member (20) arranged on the side of the intake hole (10);
A second hollow cylindrical member (21) disposed on the exhaust hole (11) side;
The first tubular member (20) and the second tubular member (21) are disposed between the first tubular member (20) and the second tubular member (21). A hollow third cylindrical member (22) made of a material higher than the thermal conductivity of
The intake hole (10), the first tubular member (20), the third tubular member (22), the second tubular member (21), and the exhaust hole (11) are connected to each other. An electronic component (31) serving as a heat source on the substrate (30) is thermally connected to the third tubular member (22) so as to form an air flow path. apparatus. The said air flow path is comprised substantially in line with the said imaging device, and the said 3rd cylindrical member (22) is located from the substantially center of the said imaging device to below. Imaging device. 3. The imaging device according to claim 1, wherein the hollow portion (22 b) of the third tubular member (22) is provided with a coating or a coating for improving heat dissipation. 4. The imaging device according to any one of claims 1 to 3, wherein a heat storage member can be inserted into the intake hole (10) or the exhaust hole (11).