JP2009284414A - Imaging unit and imaging apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To efficiently radiate heat at the side of an imaging element which can be displaced, in a two-dimensional direction which is orthogonal to the optical axis of a photographing lens, without making the structure complex. <P>SOLUTION: An imaging unit is provided with: a support plate 31 which packages a heating imaging element 24 thereon and is movable; a fixed member 53 disposed fixedly; and a heat conductive member 70, which is disposed in between a rear face of the support plate 31 and a heat radiating plane 58a faces the rear face of the support plate 31, has flexibility so as to be displaced tracking the two-dimensional displacing movement of the support plate 31 and is brought into contact with the rear face of the support plate and the heat radiating plane 58a, at all times, whereby heat conduction, from a side of the support plate 31 to a side of the heat radiating plane 58a, is performed efficiently by the heat conductive member 70 which does not cause troubles in displacing of movement. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an imaging unit and an imaging apparatus including an imaging element that can be displaced in a two-dimensional direction orthogonal to the optical axis of a photographing lens.

  An electronic camera including an image sensor such as a CCD receives a transmitted light beam of a photographing lens by an image sensor and obtains image data based on the photoelectric conversion output. Here, since the image pickup device itself generates heat, a dark current is generated by the heat, and noise is caused to deteriorate the image quality. Therefore, various heat dissipation measures have been taken conventionally.

  On the other hand, recent electronic cameras have an image blur correction drive mechanism that moves the image sensor in a two-dimensional direction orthogonal to the optical axis, and corrects image blur when image blur is detected. Some have a camera shake correction function in which the image pickup device is displaced by a drive mechanism. In this case, the heat radiating member for radiating heat of the image pickup device cannot be directly attached to the movable part, and some device is required for heat radiation countermeasures.

  Therefore, for example, in Patent Document 1, heat is transferred from the movable heat radiating member to the fixed heat radiating member by placing the surfaces of the movable heat radiating member and the fixed heat radiating member as close as possible to face each other. Moreover, in patent document 2, heat is transferred from the movable side to the fixed side by interposing a magnetic fluid between the heat radiation plates facing the movable side and the fixed side.

JP 2006-174226 A JP 2006-31027 A

  However, the method according to Patent Document 1 dissipates heat generated on the movable member side into the air inside the camera casing by convection, transfers the heat to components inside the casing, and dissipates the heat outside the camera casing. Since an air layer having a large thermal resistance is interposed in the heat transfer path between the portion to be cooled and the heat radiating member, the heat transfer efficiency is poor and the heat dissipation efficiency is not good.

  Further, the method according to Patent Document 2 requires prevention of flow out of a magnetic fluid that functions as a heat transfer member, and the structure becomes complicated.

  The present invention has been made in view of the above, and can efficiently dissipate heat on the imaging element side that can be displaced in a two-dimensional direction orthogonal to the optical axis of the photographing lens without complicating the structure. An object is to provide an imaging unit and an electronic camera.

  In order to solve the above-described problems and achieve the object, the image sensor according to the present invention is disposed on the optical axis of the photographing lens so as to be orthogonal to the optical axis, and a subject image is formed by the photographing lens. An imaging element, a heat-radiating support plate on which the imaging element is mounted on the surface, a fixing member that is fixedly disposed integrally with a heat dissipation surface at a position facing the back surface of the support plate, and the imaging A driving mechanism for displacing and moving the support plate on which the element is mounted in a two-dimensional direction perpendicular to the optical axis with respect to the fixed member; and a flexible mechanism for displacing the support plate following the displacement movement of the support plate in the two-dimensional direction. And a heat conductive member that is disposed between the back surface of the support plate and the heat dissipation surface and always contacts the back surface of the support plate and the heat dissipation surface.

  In the imaging unit according to the present invention, in the above invention, the heat conductive member is made of a heat conductive flexible material formed in a column shape, and the support plate is set so that both ends of the column shape are in contact with each other. It is characterized by being distributed between the back surface of the glass and the heat radiating surface.

  In the imaging unit according to the present invention as set forth in the invention described above, the thermal conductive member is formed of a flexible thermal conductive sheet formed in the shape of a strip ring, and the diameter end of the strip ring contacts. It is set in a direction and is arranged in a distributed manner between the back surface of the support plate and the heat radiating surface.

  In the imaging unit according to the present invention, in the above invention, the heat conductive member is formed of a heat conductive material that is formed in a coil shape and has flexibility, and is set in a direction in which both ends of the coil shape are in contact with each other. In this manner, the support plate is distributed between the back surface of the support plate and the heat dissipation surface.

  According to another aspect of the present invention, there is provided an imaging apparatus comprising: the imaging unit according to the invention described above; and a camera body in which the imaging lens is mounted and the fixing member is fixedly arranged to incorporate the imaging unit. .

  An image pickup unit and an image pickup apparatus according to the present invention are disposed between a support plate on which a heat generating image pickup element is mounted and a movable support plate and a heat dissipating surface that is integrally fixed to a fixing member and faces the back surface of the support plate. Since it is provided with a heat conductive member that is flexible to follow the displacement movement in the two-dimensional direction of the plate and always contacts the back surface of the support plate and the heat dissipation surface, heat from the support plate side to the heat dissipation surface side is provided. Transmission can be efficiently performed by the heat conductive member, and for this reason, the heat conductive member must be realized without hindering displacement movement on the support plate side and without complicating the structure. There is an effect that can be.

  The best mode for carrying out an imaging unit and an imaging apparatus according to the present invention will be described below with reference to the drawings. An image pickup apparatus including the image pickup unit according to the present embodiment will be described as an example of application to a single-lens reflex digital camera capable of exchanging lenses.

(Embodiment 1)
FIG. 1 is a central longitudinal front view showing an outline of the internal structure of the camera body of the single-lens reflex digital camera of Embodiment 1, and FIG. 2 is a longitudinal view on the lens optical axis showing the outline of the internal structure. FIG. 3 is a side view, and FIG. 3 is a horizontal sectional view on the optical axis of the lens showing the outline of the internal structure.

  The single-lens reflex digital camera according to the first embodiment includes a camera body 10 and a photographing lens 11 that is mounted on the front side of the camera body 10 in a replaceable manner. A resin-made camera body 10 that constitutes the external appearance of the camera has a ring-shaped mount portion for removably mounting a lens unit 12 including the photographic lens 11 on the front surface side position on the optical axis O of the photographic lens 11. 13 is provided. Further, the camera body 10 has a grip portion 14 that is held by the right hand of the operator at the time of shooting or the like on the left side when viewed from the front side. Various switches such as a release button and buttons are provided on the top of the grip portion 14.

  As shown in FIGS. 2 and 3, the camera body 10 includes a liquid crystal panel 17 having an acrylic panel display window 16 at a position on the optical axis O on the back side. The liquid crystal panel 17 is a TFT (Thin Film Transistor) type rectangular display panel that displays various information such as various settings and adjustment items in addition to the photographed image. The camera body 10 is provided with a finder window 18 through which an operator peeks at the time of shooting, and a hot shoe 19 to which an external flash is attached at the top.

  As shown in FIG. 2, the camera body 10 incorporates a mirror member such as a quick return mirror 20 disposed on the optical axis O on the front side, and an AF sensor unit for detecting the defocus amount below the mirror member. A mirror box 22 containing 21 etc. is provided. Further, in the camera body 10, a focal plane shutter 23 and an imaging unit 25 including an imaging element 24 and the like are perpendicular to the optical axis O on the optical axis O toward the back side from the quick return mirror 20. Are arranged in order. In the camera body 10, a sub mirror 20 a is disposed behind the quick return mirror 20 on the optical axis O, and an optical path is set so as to guide the reflected light from the sub mirror 20 a to the AF sensor unit 21. On the other hand, on the reflection side optical axis of the quick return mirror 20, a roof mirror 26, an eyepiece lens 27, and the like are arranged.

  Furthermore, a battery storage chamber 41 for storing the battery 40 is provided inside the grip portion 14 of the camera body 10. The battery 40 can be inserted into and removed from the battery storage chamber 41 by opening and closing an open / close lid 42 on the bottom surface. Inside the grip 14, on the back side, a circuit board 43 on which a circuit for performing control of the entire camera, image processing, compression processing, data storage processing, etc., a memory such as an SDRAM, a power supply circuit, etc. are mounted. 44 is arranged. The circuit board 43 and the support plate 31 on which the image sensor 24 is mounted, and the circuit boards 43 and 44 are electrically connected by flexible boards 45 and 46. In the grip portion 14, a memory slot 48 for loading a memory card 47 is formed between the battery storage chamber 41 and the circuit board 44, and is normally closed with a cover 49 that can be opened and closed. In the grip portion 14, a strobe aluminum electrolytic capacitor 50 is built in front of the battery storage chamber 31.

  Here, the imaging unit 25 includes an optical LPF (low-pass filter) 30, an imaging element 24, and a support plate 31. The imaging element 24 photoelectrically converts a subject image formed on the imaging surface by the photographing lens 11 and has a horizontally long rectangular shape with a predetermined ratio. In the first embodiment, for example, a CCD image sensor is used. . The image sensor 24 is not limited to a CCD image sensor, and may be a CMOS image sensor or the like. The support plate 31 is for mounting and fixing and positioning the image sensor 24 on the surface. The support plate 31 is made of a heat radiating material such as a metal having good heat radiating property, and is made of an aluminum plate in the first embodiment, and is formed in a horizontally elongated substantially rectangular shape larger than the image sensor 24.

  The imaging unit 25 further includes a first holding member 51, a second holding member 52, a fixing member 53, and a drive mechanism 60. The first holding member 51 is formed in a rectangular frame shape and holds the support plate 31 and the optical LPF 30 on which the image sensor 24 is mounted. The second holding member 52 is formed in a rectangular frame shape that is slightly larger than the first holding member 51, and holds the first holding member 51 so as to be movable in the Y-axis direction (vertical direction). It is. Here, between the first holding member 51 and the second holding member 52, two steel balls that are spaced apart so as to be movable only in the Y-axis direction on one side in the X-axis direction (left-right direction). The first holding member 51 can be smoothly moved in the Y-axis direction with respect to the second holding member 52 by interposing one steel ball 54b on the other side. A spring 55 is interposed between the first holding member 51 and the second holding member 52 in the vicinity of the steel ball 54b.

  The fixing member 53 is formed in a rectangular frame shape that is slightly larger than the second holding member 52, and is for holding the second holding member 52 so as to be movable in the X-axis direction. Here, between the second holding member 52 and the fixing member 53, two steel balls 56a that are arranged to be movable only in the X-axis direction on one side in the Y-axis direction, and 1 on the other side. By interposing the individual steel balls 56 b, the second holding member 52 can move smoothly in the X-axis direction with respect to the fixing member 53. A spring 57 is interposed between the second holding member 52 and the fixing member 53 in the vicinity of the steel ball 56b. In addition, the fixing member 53 is assembled to the fixing unit such as the mirror box 22 at four positions so that the imaging element 24 is positioned on the optical axis O, for example. Here, in the fixing member 53, a first fixed heat radiating plate 58 having a heat radiating surface 58a larger than the support plate 31 is integrated by screwing at a position close to and opposed to the back surface of the support plate 31. Further, the fixing member 53 and the first fixed heat dissipation plate 58 are made of a PC resin (polycarbonate resin) or a PPS resin (filler such as carbon fiber as a material having a high heat dissipation property or a material having high heat conductivity). Polyphenylene sulfide resin).

  The drive mechanism 60 includes a first drive mechanism 61 and a second drive mechanism 62. The first drive mechanism 61 is provided between the first holding member 51 and the second holding member 52 so as to correspond to the steel ball 54 portion, and the first holding member 51 is used as the second holding member 52. On the other hand, it is for moving the displacement in the Y-axis direction. For example, the first drive mechanism 61 is provided in the second holding member 52 side by being brought into press contact with the first holding member 51 and generates an elliptical vibration by applying a voltage to a driving electrode (not shown). This holding member 51 is configured as a piezoelectric element drive motor system using a piezoelectric element 61a that moves the second holding member 52 in the Y-axis direction (see FIG. 3). The second drive mechanism 62 is provided between the second holding member 52 and the fixing member 53 so as to correspond to the steel ball 56, and the second holding member 52 is moved in the X-axis direction with respect to the fixing member 53. It is for moving the displacement. The second drive mechanism 62 is also provided in the fixed member 53 side by being brought into press contact with the second holding member 52, for example, and generates an elliptical vibration by applying a voltage to a drive electrode (not shown). This is configured as a piezoelectric element drive motor system using a piezoelectric element 62a that moves 52 in the X-axis direction with respect to the fixed member 53 (see FIG. 2).

  The drive mechanism 60 is not limited to the piezoelectric element drive motor system, and may be an electromagnetic drive system or a system that drives using a flexural vibration motor as a drive source.

  By providing such a drive mechanism 60, the support plate 31 on which the image sensor 24 is mounted can be displaced in a two-dimensional direction that is up, down, left, and right within the XY plane perpendicular to the optical axis O with respect to the fixing member 53. Become. Therefore, when camera shake occurs in the single-lens reflex digital camera at the time of shooting, the drive mechanism 60 is driven to displace and move the support plate 31 in the two-dimensional direction in the XY plane. It is possible to correct image blur on the surface.

  Here, the imaging unit 25 according to the present embodiment includes a heat conductive member 70 disposed between the back surface of the support plate 31 and the heat radiation surface 58a of the first fixed heat radiation plate 58 that are disposed to face each other. This heat conductive member 70 is a heat conductive flexible material such as λ gel (registered trademark) formed in a columnar shape so as to have the flexibility to follow the displacement movement of the support plate 31 in the two-dimensional direction. And a plurality of them are distributed between the back surface of the support plate 31 and the first fixed heat radiating plate 58 so as to be evenly distributed in the vertical and horizontal directions. The heat conductive member 70 is set in a direction in which both ends of the column shape are in contact with each other so as to always contact the back surface of the support plate 31 and the heat radiation surface 58a of the first fixed heat radiation plate 58. In the first embodiment, as shown in FIG. 4, a heat radiating sheet 71 to which one end of a plurality of heat conductive members 70 is attached is provided, and the other end of the plurality of heat conductive members 70 is the support plate 31. The heat conductive member 70 is loaded by attaching the heat radiation sheet 71 on the heat radiation surface 58a so as to be in contact with the back surface.

  In the first embodiment, the second fixed heat radiating plate 72 is provided on the front surface side of the liquid crystal panel 17 at a position facing the back surface of the first fixed heat radiating plate 58. A sheet-like heat radiating member 73 made of a heat conductive material such as λ gel (registered trademark) is interposed between 72 and the first fixed heat radiating plate 58.

  In such a configuration, the image sensor 24 becomes a main heat source in the camera body 10, and heat is generated as the image sensor 24 is driven. The heat generated by the image sensor 24 is transmitted to the heat radiating support plate 31 and then transmitted to the heat radiating surface 58a side of the first fixed heat radiating plate 58 via the heat conductive member 70 having high heat conductivity. The At this time, heat can be efficiently transmitted to the heat radiating surface 58a side by transmitting heat with the heat conductive member 70 rather than transmitting the air layer. The heat transmitted to the heat radiating surface 58a is transmitted to the second fixed heat radiating plate 72 side through the heat radiating member 73, and is radiated to the outside through the exterior such as the liquid crystal panel 17.

  By the way, the support plate 31 on which the image pickup device 24 is mounted is displaced in the Y direction or the X direction during camera shake correction by the drive mechanism 60. Here, the heat conductive member 70 of the present embodiment is made of a heat conductive soft material formed in a cylindrical shape, and has the flexibility to follow the displacement movement of the support plate 31, so it always has both ends. Can maintain a state in contact with the back surface of the support plate 31 and the heat radiating surface 58a to exhibit a heat transfer effect. For example, FIG. 5A shows a case where the support plate 31 (imaging element 24) is displaced by ΔX in the X direction by the second drive mechanism 62. FIG. In this case, since the heat conductive member 70 is formed of a flexible material in a columnar shape and easily deforms, the heat conductive member 70 is inclined in the X direction following the displacement movement of the support plate 31, and the back surface of the support plate 31 and the heat radiation surface 58a. Maintain contact with each other. FIG. 5B shows a case where the first driving mechanism 61 moves the support plate 31 (imaging element 24) by ΔY in the Y direction. In this case, since the heat conductive member 70 is formed of a flexible material in a columnar shape and easily deforms, the heat conductive member 70 is inclined in the Y direction following the displacement movement of the support plate 31, and the back surface of the support plate 31 and the heat radiation surface 58a. Maintain contact with each other. Such follow-up deformation of the heat conductive member 70 with respect to the displacement movement of the support plate 31 is a light load and can be realized with a simple structure without causing any trouble with respect to the displacement movement of the support plate 31.

  Here, the difference in the heat radiation effect between the case where the heat conductive member 70 and the heat radiating member 73 are provided and the case where the heat conductive member 73 is not provided will be described with reference to FIG. 6A is a thermal circuit configuration diagram showing the case of the first embodiment as a model, and FIG. 6B is a thermal conductive member 70, a heat radiating member 73, and a first fixed heat radiating plate 58. It is a thermal circuit block diagram which models and shows the conventional case which is not provided with. In FIG. 6, fine parts such as a motor are collectively shown as one thermal resistance. Further, when the entire camera is modeled, an enormous amount is required. Therefore, in FIG. 6, only the portion on the optical axis O from the imaging unit 25 to the panel display window 17 is shown. In addition, in FIG. 6, each component indicated by a circled numeral is 1 for the optical LPF 30, 2 for the image sensor 24, 3 for the support plate 31, 4 for the first drive mechanism 61, and 5 for the second holding member 52. , 6 is the second drive mechanism 62, 7 is the fixing member 53, 8 is the second fixed heat radiation plate 72, 9 is the liquid crystal panel 17, 10 is inside the acrylic panel display window 16, and 11 is the acrylic panel display. The outside of the window 16, 12 is the first fixed heat sink 58, 13 is the second fixed heat sink 72 outside.

  First, in the conventional case not including the heat conductive member 70, the heat radiating member 73, and the first fixed heat radiating plate 58, as shown in FIG. In addition to the layer, the optical LPF 30 and the portion that radiates heat through the air layer, most of the air is transferred to the aluminum support plate 31 and then the air layer between the support plate 31 and the second fixed heat dissipation plate 72. The heat is transferred to the liquid crystal panel 17 side through the air and further radiated to the outside through the air layer and the panel display window 16 made of acrylic. That is, there are many parts depending on the air layer having a large thermal resistance, and the heat dissipation efficiency is poor.

  On the other hand, in the case of the first embodiment, as shown in FIG. 6 (b), the heat of the image sensor 24 serving as a heat generation source is the air layer, the optical LPF 30, and the part that is radiated through the air layer. After the heat is transferred to the aluminum support plate 31, first, the heat is efficiently transferred to the heat radiating surface 58 a of the first fixed heat radiating plate 58 via the heat conductive member 70, and further, the first fixed heat radiating plate. The heat transferred to 58 and the fixed member 53 is efficiently transferred to the second fixed heat radiating plate 72 via the heat radiating member 73. The heat transmitted to the second fixed heat radiating plate 72 is radiated to the outside as it is, or is transmitted to the liquid crystal panel 17 side, and further radiated to the outside through the air layer or the acrylic panel display window 16. . As described above, according to the first embodiment, the heat generated in the image sensor 24 can be efficiently transferred to the fixed heat radiating side and radiated as compared with the conventional example.

(Embodiment 2)
FIG. 7 is a diagram illustrating an image pickup unit portion according to the second embodiment of the present invention. FIG. 7A is a horizontal sectional view of the optical axis portion of the image pickup unit, and FIG. ) Is a vertical side view of the optical axis portion of the image pickup unit, FIG. 8 is a perspective view showing a heat conductive member, and FIG. 9 shows the image pickup unit portion when movable according to the second embodiment. FIG. 9A is a horizontal sectional view of the optical axis portion of the imaging unit, and FIG. 9B is a vertical side view of the optical axis portion of the imaging unit. The overall configuration of the camera is the same as that of the first embodiment, and the same parts as those shown in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

  In the imaging unit 25A according to the second embodiment, a heat conductive member 80 is disposed between the back surface of the support plate 31 and the heat radiation surface 58a of the first fixed heat radiation plate 58 instead of the heat conductive member 70. It has been made. Here, the heat conductive member 80 is made flexible by forming a heat conductive sheet in the form of a narrow band ring made of, for example, a graphite sheet and a PET film into the shape of a band ring as shown in FIG. It is something that has A plurality of thermally conductive members 80 are distributed and arranged between the back surface of the support plate 31 and the first fixed heat radiating plate 58 so as to be even in the vertical and horizontal directions. At this time, the heat conductive member 80 is easily deformed and is set in a direction in which the diameter end of the belt-shaped ring is in contact with the back surface of the support plate 31 and the heat radiation surface 58a of the first fixed heat radiation plate 58 at all times. Yes. Accordingly, the heat conductive member 80 has a ring shape as shown in FIG. 7B when viewed in the X direction, for example, and forms a belt-like ring as shown in FIG. 7A when viewed in the Y direction. Is set to

  In such a configuration, the image sensor 24 becomes a main heat source in the camera body 10, and heat is generated as the image sensor 24 is driven. The heat generated by the image sensor 24 is transmitted to the heat radiating support plate 31, and then transmitted to the heat radiating surface 58a side of the first fixed heat radiating plate 58 via the heat conductive member 80 having high heat conductivity. The At this time, heat can be efficiently transmitted to the heat radiating surface 58a side by transmitting heat with the heat conductive member 80 made of a heat conductive sheet rather than transmitting the air layer. The heat transmitted to the heat radiating surface 58a is transmitted to the second fixed heat radiating plate 72 side through the heat radiating member 73, and is radiated to the outside through the exterior such as the liquid crystal panel 17.

  By the way, the support plate 31 on which the image pickup device 24 is mounted is displaced in the Y direction or the X direction during camera shake correction by the drive mechanism 60. Here, the heat conductive member 80 of the present embodiment is a flexible heat conductive sheet formed in the shape of a belt-like ring, and is flexible following the displacement movement of the support plate 31. Therefore, the heat transfer effect can be exhibited while maintaining the state where both ends are always in contact with the back surface of the support plate 31 and the heat radiating surface 58a. For example, FIG. 9A shows a case where the support plate 31 (imaging element 24) is displaced by ΔX in the X direction by the second drive mechanism 62. FIG. In this case, since the heat conductive member 80 is formed in the shape of a belt-like ring and easily deforms, it follows the displacement movement of the support plate 31 and becomes inclined in the X direction, and is against the back surface of the support plate 31 and the heat radiating surface 58a. Maintain contact. FIG. 9B shows a case where the first driving mechanism 61 moves the support plate 31 (imaging element 24) by ΔY in the Y direction. In this case, since the heat conductive member 80 is formed in a ring shape and is easily deformed, the shape of the ring follows the displacement movement of the support plate 31 and becomes an oblique state in the Y direction, and the back surface of the support plate 31 and the heat radiation. The contact state with the surface 58a is maintained. Such a follow-up deformation of the heat conductive member 80 with respect to the displacement movement of the support plate 31 is a light load, and can be realized with a simple structure without causing any trouble with respect to the displacement movement of the support plate 31.

(Embodiment 3)
FIG. 10 is a diagram illustrating an image pickup unit portion according to the third embodiment of the present invention, and FIG. 10A is a horizontal cross-sectional view of the optical axis portion of the image pickup unit, and FIG. ) Is a vertical side view of the optical axis portion of the imaging unit, FIG. 11 is a cross-sectional view showing a mounting state of the heat conductive member, and FIG. 11 is a movable imaging unit according to the third embodiment. FIG. 11A is a horizontal sectional view of the optical axis portion of the imaging unit, and FIG. 11B is a longitudinal side view of the optical axis portion of the imaging unit. is there. The overall configuration of the camera is the same as that of the first embodiment, and the same parts as those shown in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

  In the imaging unit 25B according to the third embodiment, a thermally conductive member 90 is disposed between the back surface of the support plate 31 and the heat radiation surface 58a of the first fixed heat radiation plate 58 instead of the heat conductive member 70. It has been made. Here, the heat conductive member 90 is made flexible by forming a heat conductive material such as a copper wire in a coil spring shape. A plurality of heat conductive members 90 are distributed and arranged between the back surface of the support plate 31 and the first fixed heat radiating plate 58 so as to be even in the vertical and horizontal directions. At this time, the heat conductive member 90 is set in a direction in which both ends of the coil form are in contact with each other so that the heat conductive member 90 is easily deformed and always contacts the back surface of the support plate 31 and the heat radiation surface 58a of the first fixed heat radiation plate 58. . Further, in order to prevent displacement of the coil-shaped heat conductive member 90, for example, as shown in FIG. 11, the end of the heat conductive member 90 is inserted into the support plate 31 and the first fixed heat sink 58. Locking holes 31a and 58b to be locked are formed.

  In such a configuration, the image sensor 24 becomes a main heat source in the camera body 10, and heat is generated as the image sensor 24 is driven. The heat generated by the image sensor 24 is transmitted to the heat radiating support plate 31, and then transmitted to the heat radiating surface 58a side of the first fixed heat radiating plate 58 via the heat conductive member 90 having high heat conductivity. The At this time, heat can be efficiently transmitted to the heat radiating surface 58a side by transmitting heat by the heat conductive member 90 rather than transmitting the air layer. The heat transmitted to the heat radiating surface 58a is transmitted to the second fixed heat radiating plate 72 side through the heat radiating member 73, and is radiated to the outside through the exterior such as the liquid crystal panel 17.

  By the way, the support plate 31 on which the image pickup device 24 is mounted is displaced in the Y direction or the X direction during camera shake correction by the drive mechanism 60. Here, the heat conductive member 90 of the present embodiment is made of a heat conductive material such as a copper wire formed in a coil shape, and can be displaced following the displacement movement of the support plate 31. Since it has flexibility, it can always maintain the state which both ends contact the back surface of the support plate 31, and the thermal radiation surface 58a, and can exhibit a heat transfer effect. For example, FIG. 12A shows a case where the support plate 31 (image sensor 24) is displaced by ΔX in the X direction by the second drive mechanism 62. FIG. In this case, since the heat conductive member 90 is formed in a coil shape and is easily deformed, the heat conductive member 90 is inclined in the X direction following the displacement movement of the support plate 31, and is in contact with the back surface of the support plate 31 and the heat radiation surface 58a. To maintain. FIG. 12B shows a case where the first driving mechanism 61 moves the support plate 31 (imaging device 24) by ΔY in the Y direction. In this case, since the heat conductive member 90 is formed in a coil shape and is easily deformed, the heat conductive member 90 is inclined in the Y direction following the displacement movement of the support plate 31, and is in contact with the back surface of the support plate 31 and the heat radiation surface 58a. To maintain. Such follow-up deformation of the heat conductive member 90 with respect to the displacement movement of the support plate 31 is a light load, and can be realized with a simple structure without causing any trouble with respect to the displacement movement of the support plate 31.

  Here, the Example about the thermal radiation effect by the specific structural example based on each embodiment is demonstrated. Table 1 shows the heat radiation effect of the specific configuration example based on each embodiment in comparison with the conventional example.

  In Table 1, (1) shows the case of the conventional configuration. (2) shows the case where the heat conductive member 70 of Embodiment 1 is spread over the entire back surface of the support plate 31. (3) shows a case where the heat conductive member 70 of the first embodiment is dispersedly arranged so as to occupy 75% of the back surface area of the support plate 31, and (4) is the same as (3). Shows a case where 50% is distributed and arranged so as to occupy 50%, and (5) is the same as (3) but shows a case where 25% is distributed and arranged. Further, (6) shows a case where ten heat conductive members 80 of the second embodiment in which graphite having a thickness of 0.1 mm and a width of 2 mm is formed in a ring shape are dispersedly arranged. Furthermore, (7) shows a case where ten thermally conductive members 90 of Embodiment 3 in which a copper wire having a wire diameter of 0.25 mm and a length of 5 mm is coiled are arranged in a distributed manner.

  As an experiment for confirming the heat radiation effect, an arbitrary heat generation amount is given to the image pickup device, and each part (the image pickup device itself, the first holding member 58, the first drive) when the outside air temperature as the heat release destination is 40 ° C. The temperature of the mechanism 61, the second holding member 52, the second drive mechanism 62, and the fixing member 53) is measured. Here, the target temperature by heat radiation should just be 70 degrees C or less.

  According to the results of the heat dissipation effect shown in Table 1, it can be seen that, in the case of the conventional example that depends on the air layer, the heat dissipation effect is low and not reduced below the target temperature. Moreover, in the case of (2)-(5), the thermal radiation effect which can reduce the temperature of each part to below target temperature is acquired, and it turns out that the thermal radiation effect is so high that the ratio of the heat conductive member 70 is high. On the other hand, the ratio of the heat conductive member 70 is increased. In particular, when the heat conductive member 70 is spread over the entire back surface of the support plate 31, the heat conductive member 70 becomes difficult to deform, and the displacement of the support plate 31 is increased. Since the load at the time of movement becomes large, it is preferable to disperse and arrange the heat conductive members 70 at a ratio that can balance the load. Also, in the cases of (6) and (7), it can be seen that a heat dissipation effect that can reduce the temperature of each part below the target temperature is obtained.

  The present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the present invention. For example, the heat conductive members 70, 80, 90 shown in the first to third embodiments may be appropriately combined and arranged. For example, the cylindrical thermal conductive members 70 may be dispersedly arranged, and the coiled thermal conductive members 90 may be dispersedly arranged at appropriate positions between the thermal conductive members 70.

  Moreover, the heat conductive member arrange | positioned between the back surface of the support plate 31 and the thermal radiation surface 58a is not restricted to an example like the heat conductive members 70, 80, 90, For example, heat conductive members, such as a copper wire, are used. A heat conductive member is made flexible by bundling a good heat conductive material in a broom or brush shape, one end is fixed to the heat radiating surface 58a side, and the other end always follows the back surface of the support surface 31. You may arrange | position so that it may contact. Or you may make it use as a heat conductive member the foaming material which gave flexibility by forming a some hole in a silicon | silicone sheet | seat in the shape of a burrow.

  In the present embodiment, the first holding member 51 and the second holding member 52 are interposed between the fixing member 53 and the supporting plate 31, and the first holding member 31 is mounted. The holding member 51 can be displaced in the Y direction with respect to the second holding member 52 by the first drive mechanism 61, and the second holding member 52 can be displaced in the X direction with respect to the fixed member 53 by the second drive mechanism 62. By making it displaceable, it was displaced in a two-dimensional direction orthogonal to the optical axis. However, the present invention is not limited to such a two-stage structure, but has a one-stage planar structure in which the support plate (first holding member) can be directly displaced in the XY direction with respect to the fixing member. It may be a drive mechanism that is displaced in the Y direction and the X direction directly with respect to the fixed member by the two drive mechanisms.

  The imaging device is not limited to a single-lens reflex digital camera with interchangeable lenses, but may be a compact digital camera, a mobile phone having a photographing function, a personal digital assistant, a notebook personal computer, an electronic medical device, or the like. However, the same can be applied.

  Furthermore, in this type of camera, there is a technique called a pixel shift method in which photographing is performed with a higher number of pixels than that of the CCD device. For example, this is a technique in which a normally taken image and two images taken by moving a movable part on which an image sensor is mounted obliquely by 1/2 pixel are continuously taken and the shutter speed is reduced to half. Therefore, the image pickup device 24 is not limited to the displacement movement in the two-dimensional direction orthogonal to the optical axis O in order to prevent camera shake, and thus the image pickup device is orthogonal to the optical axis in order to shift pixels. The present invention can also be applied to the case of displacement.

1 is a central longitudinal front view showing an outline of an internal structure of a camera body of a single-lens reflex digital camera according to Embodiment 1 of the present invention. It is a vertical side view on the lens optical axis which shows the outline of an internal structure. It is a horizontal sectional view on the lens optical axis showing the outline of the internal structure. It is a perspective view which shows a heat conductive member. FIG. 3A shows an extracted imaging unit portion when moving according to the first embodiment, and (a) is a horizontal sectional view of the optical axis portion of the imaging unit, and (b) is an optical axis portion of the imaging unit. It is a vertical side view. It is the modeled thermal circuit block diagram shown contrasting with a prior art example. FIG. 3 shows an image pickup unit portion according to a second embodiment of the present invention, in which (a) is a horizontal sectional view of the optical axis portion of the image pickup unit, and (b) is an optical axis portion of the image pickup unit. It is a vertical side view. It is a perspective view which shows a heat conductive member. FIG. 4B shows an extracted imaging unit portion when moving according to the second embodiment, where (a) is a horizontal sectional view of the optical axis portion of the imaging unit, and (b) is an optical axis portion of the imaging unit. It is a vertical side view. FIG. 3A shows an image pickup unit portion according to a third embodiment of the present invention, and FIG. 4A is a horizontal cross-sectional view at the optical axis portion of the image pickup unit, and FIG. It is a vertical side view. It is sectional drawing which shows the attachment state of a heat conductive member. FIG. 4B shows an extracted imaging unit portion when moving according to the third embodiment, (a) is a horizontal sectional view of the optical axis portion of the imaging unit, and (b) is an optical axis portion of the imaging unit. It is a vertical side view.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Camera body 11 Shooting lens 24 Image pick-up element 31 Support plate 53 Fixing member 58a Heat radiation surface 60 Drive mechanism 70, 80, 90 Thermally conductive member

Claims (5)

An image sensor that is arranged on the optical axis of the photographic lens so as to be orthogonal to the optical axis and forms a subject image by the photographic lens;
A heat-radiating support plate on which the imaging element is mounted;
A fixing member that is fixedly arranged with a heat radiation surface integrally at a position facing the back surface of the support plate;
A drive mechanism for displacing and moving the support plate on which the imaging element is mounted in a two-dimensional direction perpendicular to the optical axis with respect to the fixed member;
The support plate has flexibility to follow the displacement movement of the support plate in a two-dimensional direction and is arranged between the back surface of the support plate and the heat radiating surface and is always disposed between the back surface of the support plate and the heat radiating surface. A thermally conductive member in contact with,
An imaging unit comprising:   The thermally conductive member is made of a thermally conductive flexible material formed in a columnar shape, and is arranged in a direction in which both ends of the columnar shape are in contact with each other and distributed between the back surface of the support plate and the heat dissipation surface. The imaging unit according to claim 1, wherein:   The heat conductive member is formed of a flexible heat conductive sheet formed in the shape of a belt-shaped ring, and is set in a direction in which the diameter ends of the belt-shaped ring are in contact with each other so that the back surface of the support plate and the heat dissipation surface The imaging unit according to claim 1, wherein the imaging units are arranged in a distributed manner.   The heat conductive member is formed in a coil shape and is made of a heat conductive material having flexibility, and is set in a direction in which both ends of the coil shape are in contact with each other between the back surface of the support plate and the heat dissipation surface. The imaging unit according to claim 1, wherein the imaging units are distributedly arranged. The imaging unit according to any one of claims 1 to 4,
A camera body in which the photographing lens is mounted and the fixing member is fixedly arranged to incorporate the imaging unit;
An imaging apparatus comprising:

Images