JP2013105016A - Imaging unit and imaging apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an imaging apparatus including an imaging apparatus unit enabling a temperature of an imaging device as a whole to be uniform and radiating a heat of the imaging device efficiently and stably.SOLUTION: An imaging unit includes: an imaging device; a support plate having a heat radiation property for maintaining the imaging device; a housing having a heat radiation property; a shield case attached to the housing and having a shield property; and a heat conduction member adhered to the imaging device and held in a sandwiched manner by the support plate, and having the tongue part. An end of the heat conduction member is held in a sandwiched manner by the housing and the shield case.

Description

  The present invention relates to an imaging apparatus, and particularly relates to an imaging unit including an imaging element.

  An electronic camera equipped with an image sensor such as a CCD or CMOS receives light transmitted through a photographic lens with an image sensor, converts it into image data based on its photoelectric conversion output, and records it on a recording medium such as a memory card. The image sensor itself generates heat, and a dark current is generated by the heat, resulting in noise and image quality deterioration. Therefore, it is necessary to make the temperature of the entire image sensor uniform and to take heat dissipation measures for the image sensor. . Therefore, various heat dissipation measures have been taken conventionally.

  Therefore, for example, Patent Document 1 discloses a configuration in which a flexible heat conductive member is disposed between a support member that supports the imaging element and a heat radiating surface of a fixed member that is fixedly disposed in the housing. .

JP 2009-284414 A

  However, in the prior art disclosed in the above-mentioned patent document, the heat conducting member is configured to dissipate heat to the fixing member via the support member attached to the image sensor, but the contact between the image sensor and the support member is as follows. Strictly speaking, due to the processing limit of each component flatness, the contact is not point contact but point contact, and as a result, an air layer exists between the imaging element and the support member. As a result, the temperature of the entire image sensor becomes non-uniform and the efficiency of heat conduction from the image sensor to the support member decreases. Further, the contact between the support member and the fixing member and the heat conducting member conducts heat conduction by sandwiching the heat conducting member in the gap between the supporting member and the fixing member. It is difficult to ensure stable heat conduction because the contact pressure differs.

  SUMMARY OF THE INVENTION An object of the present invention is to provide an imaging device including an imaging device unit that makes it possible to equalize the temperature of the entire imaging device and to efficiently and stably dissipate the heat of the imaging device.

  In order to achieve the above object, the present invention according to claim 1 has an image sensor (44), a support plate (45) having heat dissipation for holding the image sensor (44), and heat dissipation. A casing (30), a shield case (50) having a shielding performance attached to the casing (30), and affixed to the imaging device (44) and sandwiched between the support plate (45) and a tongue (42a ), And an end portion thereof includes a heat conduction member (42) sandwiched between the casing (30) and the shield case (50).

  In order to achieve the above object, according to the present invention, the heat conductive member (42) is made of a heat conductive sheet having flexibility, and both surfaces of the heat conductive sheet are laminated with insulating members. In addition, the end of the tongue (42a) has an opening (42b) in which the laminate is opened and the heat conductive sheet is exposed.

  In order to achieve the above object, the present invention according to claim 3 is characterized in that the heat conducting member (42) is made of a metal foil or a metal plate having heat dissipation.

  According to the present invention, the heat conducting member is directly attached to substantially the entire surface of the image pickup device, and the support member is attached to the image pickup device so as to sandwich the heat conducting member. Further, the tongue extending from the heat conducting member is sandwiched between the imaging device main body and the shield case and fixed by screws. Accordingly, it is possible to provide an imaging apparatus including an imaging apparatus unit that can equalize the temperature of the entire imaging element and efficiently and stably dissipate heat of the imaging element.

1 is a perspective view illustrating a schematic configuration of an entire camera according to an embodiment of the present invention. It is a figure which shows the electrical structure inside the camera in embodiment of this invention. It is a disassembled perspective view which shows the imaging unit and peripheral components in embodiment of this invention. It is a disassembled perspective view which shows the structure of the imaging unit in embodiment of this invention.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the present embodiment, a digital single lens reflex camera (hereinafter referred to as a camera) will be described as an imaging apparatus.

  First, an overall schematic configuration of a camera according to an embodiment of the present invention will be described with reference to FIGS. 1 and 2. FIG. 1 is an external view of the camera according to the present embodiment, and shows a state in which a photographing lens unit (not shown) is removed. FIG. 1A is a perspective view of the camera viewed from the front side (subject side), and FIG. 1B is a perspective view of the camera viewed from the back side (photographer side). FIG. 2 is a diagram showing an internal electrical configuration of the camera.

  As shown in FIG. 1A, on the front surface of the camera body 1, there is provided a mount portion 2 for detachably fixing the taking lens unit. The mount unit 2 is provided with a mount contact 3 that enables communication of a control signal, a status signal, a data signal, and the like between the camera body 1 and the photographing lens unit and supplies power to the photographing lens unit side. Further, the camera body 1 is provided with a lens lock release button 4 that is pressed when removing the mounted photographing lens unit at a position close to the mount unit 2.

  Inside the camera body 1, there is provided a mirror box 20 through which a photographic light beam that has passed through the photographic lens is guided. In the mirror box 20, a main mirror (quick return mirror) 6 for reflecting the photographing light flux in a predetermined direction is disposed. As shown in FIG. 2, the main mirror 6 is held at an angle of 45 ° with respect to the photographic optical axis so as to guide the photographic light beam in the direction of the penta roof mirror 7, and a solid-state image sensor 8 (hereinafter referred to as an image sensor). To the state of being held at the position retracted from the photographing light flux.

  The camera body 1 is provided with a grip portion 9 for a photographer to hold the camera body 1. The grip unit 9 is provided with a release button 10 for a photographer to instruct the camera 100 to perform photographing. As shown in FIG. 2, the release button 10 has SW1 (7a) and SW2 (7b). SW1 is turned on by the first stroke of the release button 10, and SW2 is turned on by the second stroke.

  A flash unit 11 that pops up with respect to the camera body 1, a shoe groove 12 for attaching a flash, and a flash contact 13 are provided on the upper part of the camera body 1.

  As shown in FIG. 1B, a finder eyepiece window 14 is provided on the back surface of the camera body 1 so that the photographer can observe the imaging light beam reflected by the main mirror 6 described above. A color liquid crystal monitor 15 capable of displaying an image is provided near the center of the back of the camera body 1.

  Next, the internal configuration of the camera 100 will be described with reference to FIG. FIG. 3 is an exploded perspective view showing an internal configuration of the camera. 3A is an exploded perspective view of the camera viewed from the front side, and FIG. 3B is a perspective exploded view of the camera viewed from the back side. In FIG. 3A, the components are arranged in the order of the mount part 2, the mirror box 20, the main body base 30, the imaging unit 40, the shield case 50, and the main board 60 along the photographing optical axis from the front side. .

  The mount 2 is fixed to the mirror box 20 by screws 2a. The mirror box 20 is fixed to the main body base 30 by screws (not shown), the imaging unit 40 is fixed to the mirror box 20 by screws 41, and the shield case 50 is fixed by screws 51. 60 are fixed by screws 61, respectively.

  The main body base 30 includes an aluminum main body 30a made of an aluminum press-molded product and a mold main body 30b made of a mold resin, and the aluminum main body 30a is exposed at the shield case receiving portions 30c, 30d, and 30e.

  The shield case 50 is a shield case having a shielding performance for preventing unwanted radiation of the signal processing board 43 mounted on the image pickup unit 40 and the main board 60 on which the main circuit of the camera is mounted. The shield case receiving portions 30c, 30d are provided. , 30e, contact surfaces 50c, 50d, 50e are formed, and are fixed to the main body base 30 with screws 51. A heat conducting member 42 made of a graphite sheet is attached to the imaging unit 40, and a tongue portion 42a of the heat conducting member 42 is sandwiched between the shield case receiving portion 30c and the contact surface 50a.

  Next, the configuration of the image sensor unit 40 will be described in detail with reference to FIG. 4A is an exploded perspective view of the camera viewed from the back side, and FIG. 4B is a plan view of the camera viewed from the back side.

  Reference numeral 44 denotes an image sensor, and an optical low-pass filter made of crystal (not shown) is attached to the image sensor. A bar code reader 44 c for management is printed on the back surface of the image sensor 44.

  Reference numeral 42 denotes a heat conducting member for diffusing heat generated by the image pickup device 44 to make the heat distribution of the entire image pickup device 44 uniform, and for releasing heat to the main body base 30 and the shield case 50. The heat conducting member 42 is composed of a graphite sheet in view of heat conduction efficiency and flexibility. Since the graphite sheet has electrical conductivity and the end face is easily chipped, a PET sheet is stuck on both sides in order to prevent short circuit with other electrical components, and electrical insulation is made. The imaging element 44 is bonded and fixed by a double-sided tape (not shown) attached to the PET sheet. Thereby, since the graphite sheet is flexible, the contact with the imaging device described in the problem can be a surface contact instead of a point contact. Further, as described above, the tongue portion 42a is provided, and a portion of the tongue portion 42a has an opening portion 42b in which a PET sheet is opened and a graphite sheet is exposed (both sides). The opening 42b is sandwiched and fixed between the shield case receiving portion 30c of the main body base 30 and the contact surface 50a of the shield case 50. Since the graphite sheet is exposed at the contact portion, heat is transferred to the aluminum main body 30a and It is possible to efficiently escape to the shield case 50, and it is also effective in unnecessary radiation because it is electrically connected. Reference numerals 42c, 42b, and 42e denote adhesion escape holes for an image element fixing member 45 described later. In addition, a hole for escaping the barcode reader 44c is integrally formed with the bonding escape hole 42e. The heat conduction member is not limited to the graphite sheet, and any member having heat conduction, such as a copper foil sheet or an aluminum sheet, may be used as long as it is selected and used in accordance with the required heat dissipation and the configuration of the camera. good.

  Reference numeral 45 denotes a plate-shaped imaging element fixing member having heat dissipation properties, and is attached to the heat conducting member 42 so as to overlap. A rectangular opening 45 a is provided in the thickness direction, and an adhesive is applied to the opening 45 a to fix the image sensor fixing member 45 and the image sensor 44. Around the image sensor holding member 45, arm portions 45b, 45c, 45d, and 45e for screw fixing to the mirror box 20 are provided.

  Reference numeral 43 denotes a signal processing board for operating the image sensor 44, which is soldered to the signal processing board 43 by leads 44a and 44b provided in the image sensor 44 and is electrically connected.

  With the above configuration, the heat distribution from the image sensor 44 is made uniform by the graphite sheet 42 and the heat distribution of the entire image sensor 44 is made uniform. I can escape. Furthermore, the tongue portion 42a allows heat to escape to the aluminum main body 30a and the shield case 50, thereby enabling efficient heat conduction.

  As mentioned above, although preferable embodiment of this invention was described, this invention is not limited to these embodiment, A various deformation | transformation and change are possible within the range of the summary.

2: Mount part 20: Mirror box 30: Main body base 30a: Aluminum main body 40: Imaging unit 42: Thermal conduction member 42a: Tongue part 42b: Opening 43: Signal processing board 44: Image sensor
45: Imaging element fixing member 50: Shield case 50a: Contact surface 60: Main board

Claims (4)

An image sensor (44), a heat radiating support plate (45) for holding the image sensor (44), a heat radiating housing (30), and a shielding performance attached to the housing (30). A shield case (50) having a tongue portion (42a) attached to the image pickup device (44) and sandwiched between the support plate (45), and an end portion of the case (30) and the shield case. And (50) a heat conducting member (42) sandwiched between the imaging unit. The heat conduction member (42) is made of a heat conduction sheet having flexibility, and both surfaces of the heat conduction sheet are laminated with an insulating member, and the laminate is opened at the end of the tongue (42a). The imaging unit according to claim 1, wherein an opening (42b) in which the heat conductive sheet is exposed is formed. The imaging unit according to claim 1, wherein the heat conducting member (42) is made of a metal foil or a metal plate having heat dissipation properties. An imaging apparatus comprising the imaging unit according to any one of claims 1 to 3.