JP2019008052A - Imaging apparatus - Google Patents

Abstract

To provide an imaging apparatus which can stably obtain a heat radiation effect of an imaging element even when tilt of the imaging element is different by imaging apparatus due to tilt adjustment of an imaging unit.SOLUTION: An imaging apparatus includes: an imaging unit 260 having a sensor substrate 207 with an imaging element 206 mounted thereon, so that a tilt angle with respect to an imaging optical axis can be adjusted; a radiation fin 214 fixed on a surface opposite a surface of the sensor substrate 207 where the imaging element 206 is mounted and having fins 214b; and an air duct having a passage for cooling the radiation fin 214 to which heat of the sensor substrate 207 is transmitted, the passage having an opening 403 where the fins 214b are inserted. Between the radiation fin 214 and the air duct, an elastic member 404 shielding the radiation fin 214 and the air duct is arranged to surround the opening 403.SELECTED DRAWING: Figure 8

Description

  The present invention relates to a heat dissipation structure of an imaging apparatus such as a digital camera or a digital video camera.

  In an imaging apparatus such as a digital video camera, power consumption increases with the recent increase in the number of pixels of an imaging element, and a structure having a higher heat dissipation effect for the imaging element is required. For example, the heat of the image sensor is circulated in the camera body by an air circulation path formed by a fan and a blower duct, and a part of the air circulation path is formed by a heat dissipation member, and the heat transmitted to the heat dissipation member is transmitted to the camera body. There has been proposed a structure for radiating heat to the outside air through a through-hole provided in (Patent Document 1).

JP 2009-71722 A

  By the way, in the case of an imaging apparatus equipped with a high-pixel imaging device, the tilt of the imaging device with respect to the lens optical axis has a more significant effect on the image quality. Therefore, the tilt of the imaging unit including the imaging device is used as the lens optical axis in the assembly process. Generally, it is adjusted to an appropriate angle.

  However, in the above-mentioned Patent Document 1, there is a deviation in the connection portion between the imaging unit and the air duct, and the width of the flow path varies depending on the result of the inclination adjustment of the imaging unit in each imaging device. It is difficult to obtain a heat dissipation effect.

  SUMMARY OF THE INVENTION An object of the present invention is to provide an imaging apparatus that can stably obtain a heat dissipation effect of an imaging element even when the inclination of the imaging element differs for each imaging apparatus by adjusting the inclination of the imaging unit. To do.

  In order to achieve the above object, an imaging apparatus of the present invention includes a lens unit, an imaging unit having a sensor substrate on which an imaging element is mounted, the tilt angle of the lens unit being adjustable with respect to the optical axis, Fixed to the surface of the sensor substrate opposite to the surface on which the imaging element is mounted, a heat dissipating fin having a plurality of fin portions and a flow path for cooling the heat dissipating fin to which heat of the sensor substrate is transmitted are formed. An air duct having an opening into which the fin portion is inserted into the flow path, and between the heat dissipating fin and the air duct, an elastic seal between the heat dissipating fin and the air duct. A member is provided so as to surround the periphery of the opening.

  According to the present invention, it is possible to stably obtain the heat radiation effect of the image pickup device even when the inclination of the image pickup device differs for each image pickup device by adjusting the inclination of the image pickup unit.

(A) is the perspective view which looked at the digital video camera which is an example of embodiment of the imaging device of this invention from the back side, (b) is the perspective view which looked at the digital video camera shown to (a) from the front side. . It is a perspective view which shows the state which attached the battery to the digital video camera shown to Fig.1 (a). (A) is the perspective view which looked at the internal structure of the digital video camera from the back side, (b) is the perspective view which looked at the internal structure of the digital video camera from the front side. FIG. 4 is a partially enlarged view of FIG. It is a figure explaining the angle adjustment method of an imaging unit. (A) is a perspective view which shows the state which attached the holder metal plate and the sensor duct unit with respect to the camera housing | casing to which the sensor unit was attached, (b) is an exploded perspective view of a sensor duct unit. FIG. 7 is a rear view of FIG. It is the PP sectional view enlarged view of FIG. It is a disassembled perspective view which shows the state which attaches a main board | substrate, a main duct, a main duct cover, and a cooling fan from the state of FIG. (A) is the figure which looked at the assembly of FIG. 9 from the arrow X direction, (b) is the QQ sectional view taken on the line of (a).

  Hereinafter, an example of an embodiment of the present invention will be described with reference to the drawings.

  FIG. 1A is a perspective view of a digital video camera as an example of an embodiment of an imaging apparatus according to the present invention as seen from the back side, and FIG. 1B is a perspective view of the digital video camera shown in FIG. FIG. FIG. 2 is a perspective view showing a state in which a battery is attached to the digital video camera shown in FIG. In the figure, Z indicates the optical axis of the lens unit 300, and the subject side (front side) is described as + Z direction and the photographer side (back side) is described as -Z direction.

  As shown in FIG. 1, a digital video camera 100 according to the present embodiment (hereinafter referred to as camera 100) has a lens unit 300 disposed on the front side, and an operation such as manual focusing is performed on the outer periphery of the lens unit 300. A possible operating ring 103 is provided. A display unit 101 made of an LCD or the like is supported on the left side as viewed from the back side of the camera 100 so as to be openable and closable.

  On the back side of the camera 100, a viewfinder 102, a battery chamber 104, a battery release switch 105, battery mounting guides 106a and 106b, a battery chamber inlet 107, and battery lock portions 113a and 113b are provided. The battery mounting guides 106 a and 106 b are not shown in the figure, but the same is provided on the opposite side in the battery chamber 104.

  A grip part 114 that is gripped by the user is provided on the left side when the camera 100 is viewed from the front side, and main air intakes 108 a and 108 b are provided on the front side of the grip part 114. Is provided with an exhaust port 109. Further, on the top surface of the camera 100, a microphone unit 110 is provided on the front side, and a zoom key 111 is provided on the back side.

  The camera 100 sucks outside air from the direction of arrow A at the battery chamber inlet 107, sucks outside air from the directions of arrows B and C at the main inlets 108 a and 108 b, and exhausts the air in the direction of arrow D at the outlet 109. The inside of the camera 100 is cooled.

  The battery lock portions 113 a and 113 b are urged in the −Z direction by an elastic member (not shown) and protrude from the battery chamber 104 in a normal state. The battery release switch 105 is a slide switch that can be operated in the + Z direction, and the battery release switch 105 and the battery lock portions 113a and 113b are integrated. For this reason, along with the sliding operation of the battery release switch 105, the battery lock portions 113a and 113b can be retracted to a position where they do not protrude from the battery chamber 104.

  As shown in FIG. 2, the battery 112 is detachably attached to the battery chamber 104. In such a mounted state, movement of the battery 112 in the −Z direction is restricted by engagement of a claw portion (not shown) provided in the battery 112 with the battery mounting guides 106 a and 106 b provided in the battery chamber 104. The

  Further, the battery lock portions 113 a and 113 b protruding from the battery chamber 104 support the bottom surface portion 112 a of the battery 112, so that the battery 112 is held in the battery chamber 104. In this state (FIG. 2), the battery chamber intake 107 is exposed to the outside, so that outside air can be sucked from the battery chamber intake 107 even when the battery 112 is attached.

  Next, the internal structure of the camera 100 will be described with reference to FIGS. 3A is a perspective view of the internal structure of the camera 100 as viewed from the back side, and FIG. 3B is a perspective view of the internal structure of the camera 100 as viewed from the front side. FIG. 4 is a partially enlarged view of FIG.

  As shown in FIG. 3, the camera housing 200 is provided with holder mounting bosses 201a to 201k and sensor mounting bosses 202a to 202c for screwing a holder metal plate 500 (see FIG. 7) described later. As shown in FIG. 4, concentric concave portions 218a to 218c that are slightly larger than the outer shape of the sensor mounting bosses 202a to 202c are provided outside the sensor mounting bosses 202a to 202c. Adjustment coil springs 216a to 216c are attached to the recessed portions 218a to 218c so as to fit along the outer shapes of the sensor attachment bosses 202a to 202c.

  In addition, the imaging unit 260 is positioned on the rear end face of the camera housing 200 by fitting the positioning holes 210a and 210b of the sensor mounting plate 208 into the positioning pins 203a and 203b provided in the camera housing 200. Installed in a state. As will be described later, the imaging unit 260 can adjust the tilt angle with respect to the optical axis. The image sensor 206 mounted on the sensor substrate 207 is fixed to the sensor mounting plate 208 by an adhesive or the like and integrated. The sensor substrate 207 corresponds to an example of the sensor substrate of the present invention.

  The connection connector 217 mounted on the sensor board 207 is electrically connected to a main board 901 (see FIG. 9) described later, and can send image information obtained from the image sensor 206 to the main board 901. . A part of the surface of the sensor substrate 207 opposite to the imaging element 206 is a copper foil exposed portion 212, and the copper foil exposed portion 212 has a sheet-like heat conduction that is slightly smaller than the copper foil exposed portion 212. An adhesive member 213 is affixed. The heat radiating fin 214 is attached to the heat conductive adhesive member 213 so that a part or all of the flange surface thereof overlaps with the image sensor 206 in the optical axis direction. As a result, the radiating fin 214 is thermally connected to the copper foil exposed portion 212 via the heat conductive adhesive member 213, and the heat generated in the sensor substrate 207 is transferred to the radiating fin 214.

  The imaging unit 260 attached to the camera housing 200 is temporarily fixed by inserting the adjustment screws 215a to 215c into the through holes 209a to 209c of the sensor attachment plate 208 and fastening them to the sensor attachment bosses 202a to 202c. The Then, after adjusting the angle of the imaging unit 260 in this state, the imaging unit 260 is permanently fixed to the camera housing 200 with an adhesive or the like.

  Next, a method for adjusting the angle of the imaging unit 260 will be described with reference to FIG. I will explain. 5A is a rear view of the camera housing 200 in a state where the imaging unit 260 is temporarily fixed, FIG. 5B is an enlarged cross-sectional view taken along line MM in FIG. 5A, and FIG. FIG. 6 is an enlarged cross-sectional view taken along line MM in FIG. 5A when the angle of the imaging unit 260 is adjusted.

  In the state of FIG. 5B, the imaging unit 260 receives the urging force in the −Z direction by the adjustment coil spring 216a. When the adjustment screw 215a is loosened in this state, the imaging unit 260 is also pushed up by the biasing force of the adjustment coil spring 216a, and the portion (N axis) supported by the adjustment screws 215b and 215c shown in FIG. As a result, the inclination shown in FIG. 5C is obtained.

  Similarly, when the adjustment screws 215b and 215c are loosened, the imaging unit 260 is pushed up by that amount by the urging force of the adjustment coil springs 216b and 216c, and an inclination is generated. In this way, by adjusting the amount of looseness of the adjustment screws 215a to 215c, the imaging unit 260 can be adjusted to an arbitrary position and posture.

  6A is a perspective view showing a state in which the holder metal plate 500 and the sensor duct unit 400 are attached to the camera housing 200 to which the imaging unit 260 is attached, and FIG. 6B is an exploded perspective view of the sensor duct unit 400. FIG.

  As shown in FIG. 6 (a), the holder metal plate 500 is attached by screws 501a to 501k (screws 501g to 501k are not shown) at positions corresponding to the holder mounting bosses 201a to 201k (see FIG. 3) of the camera housing 200. It has been. In addition, the sensor duct unit 400 is attached to the holder metal plate 500 by screws 601 a to 601 c so as to cover the imaging unit 260.

  As shown in FIG. 6B, the sensor duct unit 400 includes a sensor duct 401, a sensor duct lid 402, an elastic member 404, an intake port elastic member 412, and an exhaust port elastic member 413. Is provided with an opening 403. The opening 403 has an opening area in which the tip of the fin portion 214b of the heat radiating fin 214 can be inserted in the assembled state. The elastic member 404 is attached to the sensor duct lid 402 via a double-sided tape (not shown). The sensor duct unit 400 corresponds to an example of the air duct of the present invention.

  The opening area of the opening 407 of the elastic member 404 is larger than the opening 403 of the sensor duct lid 402. The elastic member 104 is disposed so as to surround the opening 403 along the periphery of the opening 403 of the sensor duct lid 402. The sensor duct 401 and the sensor duct lid 402 are integrated by fastening the screws 406a to 406b with the bosses 409a to 409b through the through holes 408a to 408b of the sensor duct lid 402.

  The sensor duct 401 is provided with an intake port 410 and an exhaust port 411. The intake port 410 and the exhaust port 411 are respectively provided with an intake port elastic member 412 and an exhaust port elastic member 413 having a low heat transfer coefficient, such as sponge. Is affixed with a double-sided tape (not shown). The intake port 410 corresponds to the battery chamber intake port 107.

  Next, a heat dissipation structure of the imaging unit 260 using the sensor duct unit 400 will be described with reference to FIGS. FIG. 7 is a rear view of FIG. FIG. 8A is an enlarged sectional view taken along the line P-P in FIG.

  As shown in FIG. 8A, the inner surface of the sensor duct 401 is a region that is opposed to the heat dissipating fins 214 in the Z direction and has a concave shape in order to secure a gap between the tips of the plurality of fin portions 214b. A certain concave surface portion 401a and a flat surface portion 401b which is the other region are provided. The distance h0 from the tip of the fin portion 214b to the concave surface portion 401a is set to a distance larger than the amount of displacement in the optical axis direction of the imaging unit 260 that is displaced by adjusting the tilt angle of the imaging unit 260. Specifically, a sufficient distance is secured so that the fin portion 214b and the concave surface portion 401a do not come into contact with each other due to the movement of the tip of the fin portion 214b by adjusting the tilt angle of the imaging unit 260 or the deformation of the concave surface portion 401a due to impact or the like. Yes.

  In addition, the elastic member 404 is assembled in a charged state between the flange surface 214 a of the radiating fin 214 and the sensor duct lid 402. The charge amount of the elastic member 404 is sufficiently ensured so that the hermeticity with respect to the outside is maintained regardless of the direction in which the image pickup unit 260 moves including ± Z in accordance with the angle adjustment described above.

  As shown in FIG. 7, the sensor duct unit 400 is connected to the battery chamber inlet 107 (see FIG. 1A) via the inlet elastic member 412 at the inlet 410. For this reason, the air sucked from the battery chamber intake port 107 flows into the intake port 410 in the direction of arrow E in FIG. 7, and passes through the heat radiation fins 214 on the way to take the heat of the sensor substrate 207 (FIG. 8A )), Flows in the direction of the arrow as it is, and is exhausted from the exhaust port 411 in the direction of the arrow F.

  As shown in FIG. 8B, when the plane portion 401c is entirely separated from the heat radiating fins 214, when the inflow air passes through the region of the heat radiating fins 214, the air flow resistance difference causes the difference between the air radiating fins 214. Many flows in the region between the tip of the fin portion 214b and the flat portion 401c. On the other hand, as shown in FIG. 8A, the flow of air is limited by providing the concave surface portion 401a, and the air can be more positively applied to the fin portion 214b of the radiating fin 214.

  Further, as shown in FIG. 8C, a rib 401d is formed in the sensor duct 401 in the direction perpendicular to the air flow direction, for example, to prevent the air flow between the area of the concave surface portion 401a and the fin portion 214b. Then, compared to FIG. 8A, it becomes difficult for air to flow in the region of the distance h0. Thereby, air can be positively applied to the fin part 214b. The rib 401d is disposed between adjacent fin portions 214b.

  As described above, the distance h1 perpendicular to the optical axis direction of the fin portion 214b and the rib 401d is also affected by the movement of the tip of the fin portion 214b by the angle adjustment of the imaging unit 260, the deformation of the concave surface portion 401a due to an impact, or the like. In consideration, it is desirable to secure a sufficient distance.

  Next, a heat dissipation structure of the main board 901 using the main duct 902 will be described with reference to FIGS. FIG. 9 is an exploded perspective view showing a state in which the main board 901, the main duct 902, the main duct lid 903, and the cooling fan 904 are further attached from the state of FIG. 10A is a view of the assembly of FIG. 9 as viewed from the direction of the arrow X, and FIG. 10B is a cross-sectional view taken along the line QQ of FIG. 10A. In FIG. 10A, the main duct lid 903 is not shown for convenience of explanation.

  As shown in FIG. 9, the main substrate 901 is disposed on a plane that is substantially parallel to the side surface of the camera housing 200, that is, on a plane that intersects substantially at right angles to the plane on which the sensor substrate 207 is disposed. The side of the main substrate 901 facing the holder sheet metal 500 is thermally connected to the holder sheet metal 500 via a heat conductive elastic member (not shown). Similarly, the side of the main board 901 facing the main duct 902 is thermally connected to the main duct 902 via a heat transfer elastic member (not shown).

  As a result, the heat generated in the main board 901 is divided into two paths: a path that diffuses into the camera 100 through the holder metal plate 500 and a path that is exhausted to the outside by forced air cooling through the main duct 902. Heat is dissipated. Further, in order to further enhance the effect of diffusing heat into the camera 100 through the holder sheet metal 500, the holder sheet metal 500 is made of a material having a high heat transfer coefficient such as an aluminum alloy, and around the camera casing 200 as much as possible. A lot of area is taken to surround.

  The main duct 902 includes radiating fins 902a and flat portions 902b (FIG. 10B) that are substantially parallel to the main substrate 901 and on which the radiating fins 902a are formed. As shown in FIG. 10B, the main duct lid 903 includes an opening 903a for allowing air to flow between the cooling fan 904, a flat portion 903b facing the heat radiating fin 902a, and a heat radiating fin 902a of the main duct 902. And a flat portion 903c facing the non-exposed region. Note that the cooling fan 904 is constituted by, for example, a centrifugal fan. The cooling fan 904 is attached to the main duct 902 so that the rotation axis P is substantially orthogonal to the main board.

  Here, the distance from the flat portion 902b of the main duct 902 to the flat portion 903b of the main duct lid 903 (height of the radiation fin 902a) is h2, and the distance from the flat portion 902b to the flat portion 903c of the main duct lid 903 is h3. And

  The air flow in the main duct 902 is first sucked from the directions of arrows B and C shown in FIG. 10B through the air inlets 902c and 902d, and the sucked air flows into the flat portion 902b and the flat portion 903b. Pass through the space between. The air passing through the space between the flat surface portion 902b and the flat surface portion 903b takes heat from the radiating fin 902a, passes through the space between the flat surface portion 902b and the flat surface portion 903c, flows to the cooling fan 904, and exhausts the air outlet 904a. Is exhausted in the direction of arrow D. The intake ports 902c and 902d correspond to the intake ports 108a and 108b in FIG. 1B, and the exhaust port 904a corresponds to the exhaust port 109 in FIG. 1B.

  By the way, since the ventilation resistance of air is mainly determined by the cross-sectional area of the flow path, the cross-sectional integral flow path of the heat radiation fin 902a becomes narrow in the region where the heat radiation fin 902a is disposed. For this reason, if the flow path cross-sectional area of the area where the heat dissipating fins 902a are disposed is the same as the area where the heat dissipating fins 902a are not disposed, the area where the heat dissipating fins 902a are not disposed is the dimension in the cross-sectional integral height direction of the heat dissipating fins Can be suppressed (h2-h3).

  As a result, the cooling fan 904 can be placed close to the optical axis, in other words, at a position lower than the radiation fin 902a, and the main duct 902 including the cooling fan 904 can be downsized. In addition, when the heat dissipation structure of the main duct 902 including the cooling fan 904 is downsized and disposed inside the grip portion 114, the grip portion 114 can be brought closer to the optical axis, and the center of gravity position of the camera 100 and the grip portion 114 can be obtained. Approaches and improves ease of holding.

  The main duct 902 is provided with a duct connection opening 905 for connecting to the exhaust port 411 of the sensor duct unit 400. The duct connection opening 905 is disposed on the opposite side of the rotation axis P of the cooling fan 904 with respect to the air flow flowing from the arrow B direction and the arrow C direction in FIG. 10B to the cooling fan 904. Has been. As a result, the air flow from the arrow B direction and the arrow C direction toward the cooling fan 904 and the air flow from the exhaust port 411 of the sensor duct unit 400 toward the cooling fan 904 cool without interfering with each other. Guided to fan 904. For this reason, it becomes possible to efficiently exhaust the air flows from the two directions.

  Further, since the air that has been warmed by passing through the radiation fins 902a flows to the cooling fan 904, it is difficult for the air to flow toward the duct connection opening 905 on the opposite side of the radiation fins 902a with the cooling fan 904 interposed therebetween. . Furthermore, the exhaust port 411 and the duct connection opening 905 are in contact only via the exhaust port elastic member 413 having a lower thermal conductivity than the main duct 902 and the sensor duct 401. For this reason, it is possible to minimize the heat of the main duct 902 from being transmitted to the sensor duct unit 400 via the duct connection opening 905.

  As described above, in the present embodiment, even when the tilt of the image sensor 206 differs for each camera 100 due to the tilt adjustment of the image pickup unit 260, the flow path width of the sensor duct 401 does not vary and is stable. Thus, the heat dissipation effect of the image sensor 206 can be obtained.

  The configuration of the present invention is not limited to that exemplified in the above embodiment, and the material, shape, dimensions, form, number, arrangement location, and the like can be changed as appropriate without departing from the scope of the present invention. It is.

DESCRIPTION OF SYMBOLS 100 Camera 200 Camera housing 206 Image pick-up element 207 Sensor substrate 214 Radiation fin 214b Fin part 260 Imaging unit 400 Sensor duct unit 403 Opening 404 Elastic member

Claims (7)

The lens part,
An imaging unit having a sensor substrate on which an imaging element is mounted, the tilt angle of the lens unit being adjustable with respect to the optical axis;
A heat dissipating fin fixed to a surface opposite to the surface on which the image sensor of the sensor substrate is mounted, and having a plurality of fin portions;
A flow path for cooling the heat radiating fins to which the heat of the sensor substrate is transmitted, and an air duct having an opening into which the fin portion is inserted into the flow path,
An imaging device, wherein an elastic member that seals between the radiation fin and the air duct is provided between the heat radiation fin and the air duct so as to surround the periphery of the opening.   The imaging device according to claim 1, wherein the radiation fin is fixed to the sensor substrate by a sheet-like adhesive member.   The imaging apparatus according to claim 1, wherein at least a part of the radiating fin is arranged to overlap the imaging element in an optical axis direction.   The distance between the tip of the fin portion inserted into the flow path of the air duct from the opening and the inner wall surface of the air duct facing the tip of the fin portion is displaced by adjusting the tilt angle of the imaging unit. The image pickup apparatus according to claim 1, wherein the image pickup unit is larger than a displacement amount in an optical axis direction of the image pickup unit.   The imaging apparatus according to claim 4, wherein a concave surface portion is provided on an inner wall surface of the air duct facing the tip of the fin portion.   The imaging apparatus according to claim 5, wherein tips of the fin portions are arranged in a region of the concave surface portion.   A rib extending from the concave surface portion is provided between the fin portions adjacent to each other between the concave surface portion and the tip of the fin portion in a direction perpendicular to the air flow. The imaging device according to claim 5 or 6.

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