JP6048301B2 - Electronics - Google Patents

Description

  The present invention relates to an electronic device having a heat dissipation structure.

  In the conventional digital camera, heat generation in the image sensor and the image processing circuit unit has become a problem due to the increase in the number of pixels of the image sensor and the increase in the frame rate of moving image data. In particular, when the image sensor becomes high temperature, thermal noise is generated and the image quality of the captured image is deteriorated. Therefore, there is a demand for a heat dissipation structure for keeping the image sensor as low as possible. When mounting a mechanism that adjusts the mounting position of the image sensor as a heat dissipation structure, a mechanism that prevents the camera from becoming large must be used, so it can be elastically deformed to an image sensor mounting mechanism that uses an elastic member. A heat dissipating structure combining various heat conductive sheets has been proposed (see, for example, Patent Document 1).

JP 2010-68328 A

  However, in the above-described digital camera, since the heat conductive sheet is arranged separately from the mounting portion for attaching the image pickup device, it is necessary to secure a space for arranging the heat conductive sheet. Further, in order to follow the adjustment movement amount of the image sensor, it is necessary to increase the thickness of the heat conductive sheet that can be elastically deformed. Generally, it is difficult to increase the thermal conductivity of an elastic material, and when heat is transmitted in the thickness direction of a member, the thermal resistance indicating the difficulty of heat transfer is proportional to the thickness of the member. Therefore, the heat dissipation structure with a thick heat conductive sheet has a problem that it is necessary to secure a space and it is impossible to efficiently dissipate heat.

  An object of the present invention is to provide an electronic apparatus having a heat dissipation structure that effectively radiates heat from an imaging device in a small space.

Electronic device of the present invention includes a storage unit storing an imaging device, and a fixing unit for fixing the holding portion, and a heat transfer member for transferring heat of the holding portion to the fixed portion, the heat transfer member It is being held so as to be moved in contact with respect to the fixed part.

  According to the present invention, it is possible to effectively dissipate heat from the image pickup device in a space-saving manner.

It is a perspective view which shows the front surface of the digital camera which concerns on 1st Embodiment. It is a perspective view which shows the back surface of the digital camera which concerns on 1st Embodiment. It is sectional drawing which shows the internal structure of the digital camera which concerns on 1st Embodiment. It is a top view of the image sensor attachment member concerning a 1st embodiment. It is a figure which shows the attachment structure of the image pick-up element attachment member which concerns on 1st Embodiment. It is a figure which shows adjustment of the inclination of an image pick-up element by a manufacturing error. It is a figure which shows the attachment structure of the image pick-up element attachment member which concerns on 2nd Embodiment.

  Hereinafter, a digital camera as an electronic apparatus according to the first embodiment of the invention will be described with reference to the drawings. FIG. 1 is a perspective view showing the front surface of the digital camera according to the first embodiment. A lens barrel 4 and a lens barrel removal button 6 are provided on the front surface of the digital camera 2. The lens barrel 4 includes an optical system including the photographing lens 8 and is detachably attached to the camera body 20 (see FIG. 3) of the digital camera 2. The lens barrel removal button 6 is pressed when the lens barrel 4 attached to the camera body 20 is removed.

  On the top surface of the digital camera 2, a power button 10 for turning on / off the power, a release button 12 for instructing shooting, and a moving image shooting button 14 for instructing start or stop of moving image shooting are provided.

  FIG. 2 is a perspective view showing the back surface of the digital camera according to the first embodiment. On the back of the digital camera 2, a display monitor 16 for displaying captured images and various information and a shooting mode setting dial 18 for setting a shooting mode are provided. The shooting mode setting dial 18 can set a still image shooting mode S, a moving image shooting mode M, and an image reproduction mode P.

  FIG. 3 is a cross-sectional view showing the internal configuration of the digital camera according to the first embodiment. A body side mount portion 2 a for fastening the lens side mount portion 4 a of the lens barrel 4 is provided on the front surface portion of the camera body 20 of the digital camera 2. Inside the camera body 20, an image pickup device 22, an image pickup circuit board 24, an image pickup device mounting member (image pickup device fixing plate) 26, and a control circuit section 28 are arranged.

  The image sensor 22 includes an image sensor 22a, a housing 22b that houses the image sensor 22a, and a sealing glass 22c that seals the front surface of the housing 22b, and subject light is incident on the imaging surface of the image sensor 22a via the photographing lens 8. Is incident, photoelectric conversion is performed by the image sensor 22a and an image signal is output. The back surface of the image sensor 22 is electrically connected to the image pickup circuit board 24. The image signal output from the image pickup device 22 is input to the control circuit unit 28 via the image pickup circuit board 24 and subjected to predetermined processing, and a subject image and a shot image before shooting are displayed on the display monitor 16. The image pickup circuit board 24 has an opening shape at a portion facing the center of the back surface of the image pickup element 22, and the image pickup element 22 is fixed to the image pickup element mounting member 26 through the opening of the image pickup circuit board 24. Yes.

  As shown in the plan view of FIG. 4, the imaging element mounting member 26 has three fixing portions 32 for fixing to the camera body 20 with fixing screws 34. That is, the fixing portion 32 has a hole through which the fixing screw 34 passes, and is provided in a total of three locations, one at the center of the upper end of the image sensor mounting member 26 and one at each of the left and right ends of the lower end.

  In the camera body 20, there is provided a camera body side fixing portion 36 made of a metal having high thermal conductivity and having a shape protruding toward the back side of the camera body 20. As shown in FIG. 5, a heat conductive sheet 38, a heat conductive member 40, and an elastic spring 42 are disposed between the fixing portion 32 of the image sensor mounting member 26 and the camera body side fixing portion 36.

  The heat conductive sheet 38 is a sheet material serving as an elastically deformable heat conductive member, and is disposed in close contact with the fixing portion 32 and the heat conductive member 40. The thickness of the heat conductive sheet 38 will be described later.

  The heat conductive member 40 is made of a metal having high heat conductivity. The heat conducting member 40 has a concave cross-sectional shape having an opening on the camera body side fixing portion 36 side, and the tip of the camera body side fixing portion 36 is fitted in the concave shape portion. The elastic spring 42 is disposed in the concave portion of the heat conducting member 40 and presses the heat conducting member 40 and the heat conducting sheet 38 toward the image sensor mounting member 26.

  As described above, with the heat conduction sheet 38, the heat conduction member 40, and the elastic spring 42 disposed between the image sensor attachment member 26 and the camera body side fixing part 36, the image sensor attachment member 26 is fixed by the fixing screw 34. The fixing part 32 is fixed to the camera body side fixing part 36.

  The position of the image sensor mounting member 26 with respect to the camera body 20 can be changed by changing the tightening height of the fixing screw 34. By changing the tightening height of each fixing screw 34, the image pickup of the image sensor 22 is performed. The inclination of the surface can be changed.

  Here, even when the position of the image sensor mounting member 26 is changed, the heat conducting member 40 is kept in a fitted state with the camera body side fixing portion 36, that is, in a state of being in contact with the camera body side fixing portion 36. However, it follows together with the heat conductive sheet 38. In addition, since the heat conductive sheet 38 is an elastically deformable material, even when the image sensor fixing member 26 is tilted, the heat conductive sheet 38 is kept in close contact with the image sensor mounting member 26 and the heat conductive member 40, and reliable. Heat transfer is possible.

  Next, the inclination of the image sensor 22 due to manufacturing errors will be described. FIG. 6 is a diagram illustrating adjustment of the tilt of the image sensor 22 due to manufacturing errors. The imaging element 22 may be tilted from the direction perpendicular to the optical axis of the photographing lens 8 as shown in FIG. 6A due to the manufacturing error of the digital camera 2. Therefore, the tightening height of each fixing screw 34 is changed, and the inclination of the image sensor 22 is adjusted so that the imaging surface of the imaging sensor 22a is orthogonal to the optical axis of the photographing lens 8 as shown in FIG. 6B. .

  Here, when the imaging surface of the imaging sensor 22a is tilted from the direction orthogonal to the optical axis of the imaging lens 8 due to a manufacturing error, θ is the maximum tilt angle, and the imaging element mounting member 26 is positioned from the optical axis of the imaging lens 8. When the length to the center of the hole of the fixing portion 32 is L, the fixing screw 34 is tightened by δ (= L · tan θ) in order to make the imaging surface of the imaging sensor 22a orthogonal to the optical axis of the photographing lens 8. It is necessary to change the height. Therefore, the thickness of the heat conductive sheet 38 is determined to be a thickness that can be elastically deformed by δ. This makes it possible to dispose a heat conductive sheet 38 thinner than the conventional one.

  According to the digital camera 2 according to the first embodiment, the camera body side fixing portion 36 is fitted to the heat conducting member 40 to increase the contact area, whereby the heat generated in the image pickup device 22 is increased. 26, the heat conduction sheet 38 and the heat conduction member 40 can be efficiently transmitted to the camera body side fixing portion 36, so that heat can be efficiently radiated.

  Further, since the heat conductive sheet 38 is thinned, heat can be easily transferred from the heat conductive sheet 38 to the heat conductive member 40, so that heat can be efficiently radiated. In addition, since the heat conductive sheet 38 is thinned, the cost can be reduced, and space saving in the digital camera 2 can be realized.

  In the digital camera 2 according to the first embodiment, in order to increase the degree of adhesion between the camera body side fixing portion 36 and the heat conducting member 40, the camera body side fixing portion 36 and the heat conducting member 40 are interposed between each other. A heat conductive filler may be filled.

  Next, a digital camera 2 according to a second embodiment will be described. FIG. 7 is a view showing a mounting structure of the image sensor mounting member 26 according to the second embodiment. Note that the same components as those in the first embodiment are denoted by the same reference numerals and description thereof is omitted. The imaging element mounting member 26 is fixed to the camera body side fixing portion 54 by a fixing screw 50 formed of a metal material having high thermal conductivity.

  The camera body-side fixing portion 54 has a concave opening 54a at the tip that protrudes toward the back side of the camera body 20, and the heat transfer portion 52 that is the tip of the fixing screw 50 is fitted into the opening 54a. Has been.

  The heat conductive sheet 38 is sandwiched between the fixing portion 32 of the imaging element mounting member 26 and the head of the fixing screw 50. The elastic spring 42 is disposed between the image sensor mounting member 26 and the camera body side fixing portion 54, and presses the image sensor mounting member 26 and the heat conduction sheet 38 toward the head side of the fixing screw 50. Since the heat conductive sheet 38 can be elastically deformed similarly to the first embodiment, even when the image sensor mounting member 26 is tilted, the heat conductive sheet 38 is in close contact with the image sensor mounting member 26 and the fixing screw 50. Can keep.

  Since the inside of the digital camera 2 is configured as described above, the heat generated in the image sensor 22 is transmitted to the camera body side fixing portion 54 via the image sensor mounting member 26, the heat conductive sheet 33, and the fixing screw 50.

  According to the digital camera 2 according to the second embodiment, by increasing the contact area between the fixing screw 50 and the camera body side fixing portion 54, the heat generated in the image sensor 22 is transferred from the fixing screw 50 to the camera body side. Since it can transmit efficiently to the fixing | fixed part 54, it can thermally radiate efficiently.

  Further, since the heat conducting member 40 in the first embodiment can be omitted, it is possible to further save space and reduce the cost.

  In the digital camera 2 according to the second embodiment, in order to increase the degree of adhesion between the heat transfer part 52 of the fixing screw 50 and the opening 54a of the camera body side fixing part 54, the fixing screw 50 and the camera body side A heat conductive filler may be filled between the fixed portion 54 and the fixing portion 54.

  DESCRIPTION OF SYMBOLS 2 ... Digital camera, 8 ... Shooting lens, 20 ... Camera body, 22 ... Image sensor, 26 ... Image sensor attachment member, 34 ... Fixing screw, 36 ... Camera body side fixing | fixed part, 38 ... Heat conduction sheet, 40 ... Heat conduction Member, 42... Elastic spring.

Claims (4)

A holding unit for holding an imaging element,
A fixing part for fixing the holding part;
A heat transfer member that transfers heat of the holding part to the fixed part ,
Moving capable electronic device is held in a state wherein the heat transfer member is in contact with respect to the fixed part. An elastic member disposed between the heat transfer member and the fixed portion;
The electronic apparatus according to claim 1, wherein the heat transfer member is movably held by the elastic member. The electronic apparatus according to claim 1, wherein the heat transfer member has a surface along the direction of movement, and contacts the fixing portion on the surface. The electronic apparatus according to any one of claims 1 to 3, wherein the heat transfer member has a recess that fits into the fixed portion.

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