JP2019186871A - Cooling device and imaging apparatus equipped with the same - Google Patents

Abstract

To provide: a cooling device which enables highly efficient heat exhaust from the inside to the outside of a housing by forced air cooling; and an imaging apparatus equipped with the cooling device.SOLUTION: Provided is a hollow cooling device which is detachably fitted to a lens barrel provided with an imaging optical system as well as to an imaging apparatus provided with an electronic component and an imaging element. The cooling device surrounds an optical axis of the imaging optical system. The cooling device comprises: heat transfer means for transferring heat generated from the electronic component or the imaging element to the cooling device; an inner peripheral part which is formed to surround the optical axis; an outer peripheral part which is formed to surround the optical axis and serves as an outer package for the cooling device; and a hollow part which is formed between the inner peripheral part and the outer peripheral part so as to serve as a passage for gas. The outer peripheral part has: an intake port for flowing the gas into the hollow part; and an exhaust port for discharging the gas from the hollow part. The hollow part is provided with a fan which gives, to the gas inside the hollow part, driving force for flowing from the intake port to the exhaust port.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a cooling device including a fan as cooling means by forced convection and an imaging device including the same.

  In recent years, imaging devices such as cameras have become highly functional, such as high-definition video shooting, and accordingly, the power consumed in the device has increased and the amount of heat generated has also increased. Patent Document 1 discloses an imaging apparatus that has a housing provided with an intake port and an exhaust port, and forcibly air-cools the image sensor by applying a gas taken from outside by a fan to the back surface of the image sensor. Patent Document 2 discloses a lens unit in which heat dissipating fins are provided in the periphery of a lens barrel that is not normally used.

JP 2011-35786 A JP 2006-330388 A

  In the imaging apparatus of Patent Document 1, a gas drawn into the housing from the outside by a fan is applied to the imaging element, and the gas transmitted with the heat of the imaging element is discharged outside from the exhaust port. However, since the interior of the imaging device, which is a precision machine, has a large number of components arranged without gaps, the flow path of the gas may be bent or thinned, resulting in an increase in the resistance of the flow path. is there. Moreover, since the heat dissipation area of the member that performs heat exchange cannot be increased, the heat dissipation efficiency is poor.

  The lens unit of Patent Document 2 does not employ the forced air cooling method, and thus cannot cope with the heat generation of recent imaging devices.

  An object of the present invention is to provide a cooling device capable of efficiently performing exhaust heat from the inside of the housing to the outside by forced air cooling and an imaging device including the same.

  A cooling device according to one aspect of the present invention is a hollow lens that is detachably attached to a lens barrel that includes an imaging optical system, and an imaging device that includes an electronic component and an imaging element, and surrounds the optical axis of the imaging optical system. A cooling device, comprising: heat transfer means for transferring heat generated from the electronic component or the image sensor to the cooling device; an inner peripheral portion formed so as to surround the optical axis; and an exterior of the cooling device. An outer peripheral portion formed so as to surround the optical axis, and a hollow portion that is formed between the inner peripheral portion and the outer peripheral portion and serves as a gas flow path. An air intake port through which gas flows into the hollow portion and an exhaust port through which gas is discharged from the hollow portion, and the hollow portion has a gas inside the hollow portion flowing from the air intake port to the exhaust port. The fan that gives the driving force is arranged And wherein the Rukoto.

  An imaging device according to another aspect of the present invention is a hollow cooling device that is provided between an electronic component, an imaging device, an imaging optical system, and the imaging device, and surrounds the optical axis of the imaging optical system. And heat transfer means for transferring heat generated from the electronic component or the imaging device to the cooling device, the cooling device including an inner peripheral portion formed so as to surround the optical axis, and the cooling device An outer periphery of the device, the outer peripheral portion formed so as to surround the optical axis, and a hollow portion that is formed between the inner peripheral portion and the outer peripheral portion and serves as a gas flow path. Is provided with an intake port for allowing gas to flow into the hollow portion, and an exhaust port for discharging gas from the hollow portion, and the hollow portion includes gas from the intake port to the exhaust port. Fans that provide driving force to flow into And features.

  ADVANTAGE OF THE INVENTION According to this invention, the cooling device which can perform efficiently the exhaust heat from the inside of a housing | casing by forced air cooling to the exterior, and an imaging device provided with the same can be provided.

1 is a perspective view of a camera system of Example 1. FIG. FIG. 3 is a top view of the camera system according to the first embodiment. It is the sectional view on the AA line of FIG. 2, and the BB sectional view. FIG. 2 is a block diagram illustrating an electrical configuration of the camera system according to the first embodiment. It is a figure explaining the structure of the fan of Example 1. FIG. It is explanatory drawing of the flow of the gas at the time of using an axial fan. FIG. 3 is a configuration explanatory diagram of a cover member of Example 1. It is sectional drawing of the cooling unit when the cover member of Example 1 is attached. It is a center sectional view of a camera system in case a cooling unit of Example 1 is detachably attached to an imaging device. It is a center sectional view of the camera system which has a cooling unit of a different shape of Example 1. FIG. 6 is a central cross-sectional view of the camera system of Example 2. It is a figure explaining the cooling unit of Example 2. FIG. It is a figure explaining the cooling unit which has a rib different from the rib of FIG. 12 of Example 2. FIG. It is a figure explaining the cooling unit which has a rib different from the rib of FIG. 12 of Example 2. FIG. It is a figure explaining the cooling unit which has a rib different from the rib of FIG. 12 of Example 2. FIG. It is a figure explaining the cooling unit which has a different structure of Example 2. FIG. FIG. 10 is an explanatory diagram of a camera system according to a third embodiment. 6 is a perspective view of a cooling unit according to Embodiment 3. FIG. FIG. 10 is a diagram illustrating the arrangement of driving coils according to a third embodiment. 6 is a cross-sectional view of a cooling unit according to Embodiment 3. FIG. 6 is a cross-sectional view of a cooling unit according to Embodiment 3. FIG. FIG. 10 is an explanatory diagram of a camera system according to a fourth embodiment. 6 is a cross-sectional view of a cooling unit according to Embodiment 4. FIG. It is a center sectional view of the camera system which has a fan of different composition of Example 4.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In each figure, the same members are denoted by the same reference numerals, and redundant description is omitted.

  FIG. 1 is a perspective view of a camera system 1000 according to the present embodiment. FIG. 2 is a top view of the camera system 1000. 3A is a cross-sectional view taken along the line AA in FIG. 2, and FIG. 3B is a cross-sectional view taken along the line BB of the imaging device 1. FIG. 4 is a block diagram showing an electrical configuration of the camera system 1000.

  The camera system 1000 includes an imaging device 1 and a lens barrel 2 that is detachably attached to the imaging device 1. The imaging device 1 and the lens barrel 2 are electrically connected via an electrical contact 18 and can communicate with each other. Note that the imaging device 1 and the lens barrel 2 may be configured integrally.

  The lens barrel 2 has a photographing optical system 3 composed of a plurality of optical lenses. The photographing optical system 3 includes a focus lens 31 and a diaphragm unit 32.

  The operation detection unit 15 receives an operation signal obtained from operation means such as the shutter release button 8 and outputs the operation signal to the control unit 5. The control unit 5 includes a circuit that controls the camera system 1000, and generates and outputs a timing signal at the time of imaging. Further, the control unit 5 controls driving of the image sensor 6, driving of the shutter mechanism 11, operation of the image processing unit 19, compression processing of the memory unit 12, and the like. The control unit 5 controls the display states of the first display unit 7 and the second display unit 10. The first display means 7 is a touch panel and is connected to the operation detection unit 15. The image displayed on the second display means 10 can be observed through the eyepiece lens group 9.

  Light from the object forms an image on the imaging surface of the image sensor 6 via the photographing optical system 3. The control unit 5 adjusts an appropriate focus position by driving the lens driving unit 17 via the lens control unit 16 based on the focus detection signal obtained from the image sensor 6 and changing the state of the photographing optical system 3. A so-called AF operation is performed. In addition, the control unit 5 performs a so-called AE operation in which an exposure state is set based on a signal from the image sensor 6. The exposure state includes the exposure time to the image sensor 6, the aperture value by the aperture unit 32, the signal amplification factor of the image sensor 6, and the like. Further, when the photographing optical system 3 includes a blur correction lens, the control unit 5 can control the blur correction lens by driving the lens driving unit 17 via the lens control unit 16.

  The image processing unit 19 includes an image processing unit including an A / D converter, a white balance circuit, a gamma correction circuit, an interpolation calculation circuit, and the like, and generates a recording image. In addition, the image processing unit 19 compresses images, moving images, sounds, and the like.

  The memory unit 12 includes a processing circuit necessary for recording in addition to the storage unit. The memory unit 12 outputs to the recording unit and generates or stores an image to be displayed on the first display unit 7 or the second display unit 10.

  In the aiming operation of the imaging apparatus 1, it is possible to perform subject observation (live view shooting) with the first display unit 7 or the second display unit 10 while shooting an electronic image with the imaging element 6.

  In the housing 1 b of the imaging device 1, an internal space 1 a is provided between the imaging element 6 and the electrical contact portion 18. The imaging device 1 includes a cooling unit (cooling device) 100 that is provided between the imaging device 1 and the lens barrel 2 so as to surround the optical axis 4 and the internal space 1a of the photographing optical system 3, that is, a hollow shape. Have. In the present embodiment, the cooling unit 100 is configured in a cylindrical shape, but may be configured in other shapes as long as the configuration surrounds the optical axis 4 and the internal space 1a.

  The cooling unit 100 includes an inner cylindrical portion (inner peripheral portion) 102 and a cylindrical outer portion (outer peripheral portion) 103, and includes a hollow portion 104 that is a space formed between the inner cylindrical portion 102 and the cylindrical outer portion 103. Have. The cooling unit 100 takes in a gas from the outside, performs heat exchange for transferring heat generated in the imaging apparatus 1 to the taken-in gas, and discharges the gas delivered to the outside.

  In the inner cylinder portion 102, heat (heat inside the image pickup apparatus 1) generated from electronic components such as the control unit 5, the image sensor 6, and the first display unit 7 due to the operation of the image pickup apparatus 1 is transferred to the inner cylinder portion 102. A heat transfer means 13 for transmission is connected. The inner cylinder part 102 is comprised with the member with high heat conductivity. The inner cylinder portion 102 is made of an alloy having high thermal conductivity such as magnesium, aluminum, and copper. The heat transfer means 13 is configured by a member having high thermal conductivity capable of transferring the heat inside the imaging device 1 to the inner cylindrical portion 102. The heat transfer means 13 is made of a material having high thermal conductivity such as a carbon film or a metal plate such as aluminum or copper.

  The cylinder exterior portion 103 has an intake port 111 and an exhaust port 112 through which gas can enter and exit between the hollow portion 104 and the outside. The cylinder exterior portion 103 is a member that the user may touch, and the temperature rises during heat exchange by the cooling unit 100, and the temperature rise of a resin or the like having a low thermal conductivity in order to prevent the user from being burned. It is desirable to be made of a material that is difficult to do.

  A fan 101 that is driven and controlled by the control unit 5 is disposed at the bottom of the hollow portion 104. In this embodiment, the fan 101 is arranged at the lowermost part of the hollow part 104. However, this is because the image pickup device 6 is generally in a horizontally long rectangular shape, and the lowermost part of the hollow part 104 has a space in the space. This is because it is easy to arrange a fan with high cooling capacity. For the same reason, the fan 101 may be disposed at the top of the hollow portion 104. The position where the fan 101 is arranged may be determined based on whether the installation phase of the electrical contact portion 18 can be avoided. In addition, the lowermost part and the top part of the hollow part 104 include not only the case where it is strictly the lowest part and the top part but also the case where it is substantially the lowest part and the top part (substantially the lowest part and the substantially top part). It is.

  FIG. 5 is an explanatory diagram of the configuration of the fan 101. In this embodiment, the fan 101 is a centrifugal fan. The fan 101 includes a fan housing 101a and a rotary blade 101b. The rotary blade 101b rotates around the rotary shaft 101c to provide driving force for the intake and exhaust of the fan 101. The fan housing 101a faces the air inlet 111 and is provided with a fan air inlet 101d provided so as to be perpendicular to the rotating shaft 101c, and a fan air outlet provided so as to be perpendicular to the direction orthogonal to the rotating shaft 101c. 101e. When the rotating blade 101b rotates, a driving force is generated by which gas is pushed out from the rotating shaft 101c in the circumferential direction by centrifugal force. As a result, gas is sucked from the fan intake port 101d along the direction of the rotation shaft 101c (Y direction), and gas is discharged from the fan exhaust port 101e along the direction orthogonal to the rotation shaft 101c (X direction). By operating the fan 101 in accordance with the state of the imaging device 1, it is possible to exhaust heat by forced air cooling.

  When the fan 101 operates, a suction force indicated by an arrow α1 in FIG. 3B is activated, and gas is drawn from the outside of the imaging device 1 to the fan intake port 101d through the intake port 111. The drawn gas receives a discharge force indicated by an arrow α2 in FIG. 3B and is discharged from the fan exhaust port 101e. The hollow portion 104 functions as a flow path for the gas discharged from the fan exhaust port 101e, and the gas flows as indicated by an arrow β in FIG. At this time, the heat transferred from the electronic component, which is a heating element inside the imaging device 1, to the inner cylindrical portion 102 via the heat transfer means 13, passes through the hollow portion 104 as shown by an arrow a in FIG. Passed to the flowing gas. That is, the inner cylinder part 102 functions as a heat exchange part that transfers heat transferred from the inside of the imaging apparatus 1 to the inner cylinder part 102 to the gas. As described above, the inner cylindrical portion 102 is configured by a member having high thermal conductivity, and heat transmitted from the inside of the imaging device 1 can be quickly diffused and uniformed over the entire region. Therefore, the heat radiation area can be increased, and highly efficient heat exchange is possible. The gas flowing through the hollow portion 104 is finally discharged to the outside from the exhaust port 112 as indicated by an arrow γ.

  Usually, when performing forced air cooling, the gas taken in from the outside is applied to the heat generating part or the fin that has transmitted heat from the heat generating part, and the heated gas is discharged. However, since the interior of the imaging apparatus, which is a precision machine, is packed with many components without gaps, the flow path resistance may increase due to the gas flow path becoming twisted or narrowed. In addition, since the heat radiation area such as fins for heat exchange cannot be increased, the heat radiation efficiency is poor. In this embodiment, the cooling unit 100 disposed around the lens barrel 2 is used as a forced air-cooled gas flow path. For this reason, a flow path with low flow resistance is realized that does not bend or narrow in a complicated manner. Moreover, since the whole inner cylinder part 102 can be used as a heat exchange part, the heat exchange part which has a very large heat radiation area compared with the past is realizable. Therefore, in the configuration of the present embodiment, it is possible to realize a heat exchange section with a low flow resistance and a large heat radiating area, so heat exhausted from the inside of the housing to the outside by forced air cooling can be performed with high efficiency. is there.

  Usually, in order to reduce the resistance when gas flows through the fan, it is preferable to shorten the distance between the fan intake port and the fan exhaust port. That is, it is preferable to provide the fan inlet and the fan outlet on a straight line passing through the center of the circle formed by the cooling unit 100. FIG. 6 is an explanatory diagram of the gas flow when the axial fan 1010 is used. When the axial fan 1010 operates, the suction force indicated by the arrow δ1 works, and gas is drawn into the fan intake port from the outside of the imaging device 1. The drawn gas receives a discharge force indicated by an arrow δ2, and is discharged from the fan exhaust port. That is, the gas suction direction and the discharge direction of the axial fan 1010 coincide with each other, and the gas inflow direction when drawn into the hollow portion 104 is parallel to the direction passing through the center of the circle formed by the cooling unit 100. . However, the direction of the flow path of the gas immediately after being drawn into the hollow portion 104 is the tangential direction of the circle formed by the cooling unit 100 perpendicular to the inflow direction. Therefore, the gas flowing into the hollow portion 104 first collides with the inner cylinder portion 102, and then flows in the tangential direction (X direction) of the circle formed by the cooling unit 100 from the inflow direction, as indicated by an arrow δ3. And the momentum is reduced to flow through the hollow portion 104. Therefore, the flow resistance as a gas flow path of the hollow portion 104 is increased, and the heat carrying efficiency is lowered. In this embodiment, the fan 101 is used in which the gas suction direction and the discharge direction are perpendicular to each other. Thus, the gas discharge direction from the fan exhaust port 101e indicated by the arrow α2 in FIG. 3B and the gas flow direction of the hollow portion 104 can be the same direction. Therefore, as in the case where the axial flow fan 1010 is used, it is possible to realize a configuration in which the gas flow does not collide with the inner cylindrical portion 102 that is the flow channel inner wall and the momentum is reduced, and the flow resistance is low. Therefore, it is possible to efficiently transport gas by making full use of the power of the fan.

  In the present embodiment, the heat generated by the electronic components inside the imaging device 1 is transmitted to the inner cylindrical portion 102 through the heat transfer means 13 and is transferred to the gas flowing into the hollow portion 104 from the outside via the inner cylindrical portion 102. . That is, the gas flowing in by forced air cooling flows only through the hollow portion 104. The hollow portion 104 is connected to the outside in order to draw in the gas, but is not connected to the internal space 1 a of the imaging device 1. Therefore, water droplets and dust from the outside enter the imaging device 1 through the hollow portion 104 and do not adhere to the electronic component. Therefore, it is possible to prevent malfunction or failure of the electronic component due to intrusion of water droplets or dust.

  In the present embodiment, as shown in FIG. 3B, in the normal position in the posture of the imaging apparatus 1, the intake port 111 is provided at the lowermost part of the cylinder exterior part 103, and the exhaust port 112 is provided in the cylinder exterior part 103. Is provided at the top. In this embodiment, the gas flowing into the hollow portion 104 from the outside flows from the lower portion to the upper portion by forced air cooling by the fan 101. Further, when the gas flowing into the hollow portion 104 receives heat from the inner cylindrical portion 102 and is warmed, the gas expands and the specific gravity decreases, so that it tends to rise against gravity. This is called the chimney effect. Therefore, the gas flow direction by the fan 101 and the gas flow direction by the chimney effect coincide. As a result, the gas flow increases, the exhaust heat efficiency can be improved, and highly efficient forced air cooling is possible. It should be noted that the lowermost part and the uppermost part of the lens barrel 2 are not only strictly the lowermost part and the uppermost part, but also the lowermost part and the uppermost part (substantially the lowest part and the substantially uppermost part). included.

  In this embodiment, as shown in FIG. 1B, the air inlet 111 located at the lower part of the cylinder exterior portion 103 is exposed. However, as shown in FIG. A cover member 105 covering 111 may be provided. FIG. 7 is an explanatory diagram of the configuration of the cover member 105. FIG. 8 is a cross-sectional view of the cooling unit 100 when the cover member 105 is attached. As shown in FIG. 8, a hollow portion 106 is formed between the cover member 105 and the tube exterior portion 103. The hollow portion 106 is connected to the hollow portion 104 through the air inlet 111. The cover member 105 has a cover intake port 105 a at a position not facing the intake port 111. The gas outside the imaging device 1 flows into the hollow portion 106 through the cover intake port 105a as indicated by an arrow ε in FIG. The inflowing gas flows through the hollow portion 106 that functions as a gas flow path and reaches the intake port 111. As described above, the gas reaching the intake port 111 is drawn into the hollow portion 104 from the intake port 111, flows through the hollow portion 104, and is discharged from the exhaust port 112. By having the cover member 105, it is possible to prevent the intake port 111 from being blocked by the user holding the imaging device 1 by placing his / her hand on the lowermost periphery of the lens barrel 2 during shooting. .

  In the above description, the configuration in which the cooling unit 100 is integrated with the imaging device 1 has been described, but the same effect can be obtained with a configuration in which the cooling unit 100 is separated from the imaging device 1. FIG. 9 is a central sectional view of the camera system 1000 when the cooling unit 100 is detachably attached to the imaging device 1. The cooling unit 100 is configured to be detachably attached to the imaging device 1 via the mount portion 1c. The cooling unit 100 has a heat transfer contact 107 that is a contact point for transferring heat generated by electronic components inside the image pickup apparatus 1 when mounted on the image pickup apparatus 1, and heat transferred to the heat transfer contact 107. Conductive means 108 that transmits to the inner cylindrical portion 102. The heat transfer contact 107 is made of, for example, a metal such as copper or aluminum having a high thermal conductivity. The conduction means 108 is made of a material having high thermal conductivity such as a carbon film or a sheet metal such as aluminum or copper. In addition, the cooling unit 100 includes an electrical contact portion 109 that is electrically connected to the electrical contact portion 18 of the imaging device 1 and the lens barrel 2.

  In this embodiment, the cooling unit 100 has a cylindrical shape, but the present invention is not limited to this. If the cooling unit 100 is configured to surround the optical axis 4, the effect of the present invention can be obtained. FIG. 10 is a central sectional view of a camera system 1000 having a hexagonal cooling unit 100 different from a cylindrical shape. The cooling unit 100 may have a polygonal shape instead of a hexagonal shape.

  As described above, according to the present embodiment, it is possible to provide a cooling device that can efficiently exhaust heat from the inside of the housing to the outside by forced air cooling or an imaging device including the same.

  FIG. 11 is a central sectional view of the camera system 1000 of the present embodiment. In the present embodiment, the same members as those in the first embodiment are denoted by the same reference numerals, and redundant description is omitted.

  A large lens barrel 2 may be attached to the image pickup apparatus 1 due to the higher definition of the acquired image and the higher magnification of the photographing optical system 3. In such a case, a moment M indicated by an arrow is generated due to the weight of the lens barrel 2. The imaging optical system 3 and the image sensor 6 are relatively tilted by the moment M, and image quality deterioration may occur. In the present embodiment, the rib 201 is provided in the hollow portion 104 to reduce the influence of the moment M.

  FIG. 12 is an explanatory diagram of the cooling unit 100 of the present embodiment. FIG. 12A is a side view of the imaging apparatus 1. FIG.12 (b) is CC sectional view taken on the line of Fig.12 (a). FIG. 12C is a diagram for explaining the structure of the rib, and shows a state in which a part of the cooling unit 100 is cut away. FIG. 12D is a development view of the cooling unit 100.

  In the present embodiment, the intake port 111 is provided at the top of the cylinder exterior part 103, and the exhaust port 112 is provided at a position shifted from the top of the cylinder exterior part 103. The fan 101 is disposed at the top of the hollow portion 104 surrounded by the inner cylinder portion 102, the cylinder exterior portion 103, the lens barrel side wall portion 110a, and the imaging device side wall portion 110b. By disposing the fan 101 at the top of the hollow portion 104, compared to the case where the fan 101 is disposed at the lowermost portion of the hollow portion 104, intake air is generated when the imaging device 1 is installed on a tripod or placed on a desk. The possibility that the mouth 111 is blocked is reduced. Note that the fan 101 of this embodiment is a centrifugal fan as in the first embodiment.

  When the fan 101 operates, the suction force indicated by the arrow 23 a is activated, and gas is drawn into the fan 101 from the outside of the imaging device 1 through the intake port 111. The gas discharged from the fan 101 flows as indicated by arrows 23b, 23c, and 23d, and is finally discharged from the exhaust port 112 as indicated by an arrow 23e.

  The ribs 201a and the ribs 201b are provided alternately. The rib 201 a is provided in the inner cylinder portion 102, and a gap is formed between the rib 201 a and the cylinder exterior portion 103. The rib 201 b is provided in the cylinder exterior portion 103, and a gap is formed between the rib 201 b and the inner cylinder portion 102. As shown by arrows 23b, 23c, and 23d, the gas flowing into the hollow portion 104 alternately passes through the space on the cylinder exterior portion 103 side and the space on the inner cylinder portion 102 side, and is discharged from the exhaust port 112. . Since the gas flows through the hollow portion 104 while meandering, the gas easily touches the rib 201a and the rib 201b. The rib 201a and the rib 201b function as a heat exchange unit that receives heat from the gas. When the rib 201a and the rib 201b are provided so as not to form a gap, the flow path is blocked and the forced air cooling by the fan 101 cannot be performed appropriately.

  As shown in FIG. 12D, the rib 201a and the rib 201b are provided so as to exist even if cut at any position on the planes 14a, 14b, and 14c perpendicular to the optical axis 4. That is, the rib 201 a and the rib 201 b are provided so as to exist on a predetermined plane that passes through the hollow portion 104 and is perpendicular to the optical axis 4. When the rib 201 is not present when cut along a plane perpendicular to the optical axis 4, a large deformation occurs due to the influence of the moment M caused by the weight of the lens barrel 2. With the configuration of the present embodiment, there is no portion having a small cross-sectional secondary moment, so that a highly rigid cooling unit 100 can be realized. Therefore, it is possible to provide the user with a high-quality image by suppressing the relative inclination between the photographing optical system 3 and the image sensor 6.

  FIG. 13 is an explanatory diagram of the cooling unit 100 having ribs different from the ribs of FIG. FIG. 13A is a cross-sectional view of the cooling unit 100. FIG. 13B is a diagram for explaining the structure of the rib 201c, and shows a state in which a part of the cooling unit 100 is cut away. FIG. 13C is a development view of the cooling unit 100. The rib 201c is provided so that no gap is formed between the inner cylinder portion 102 and the cylinder exterior portion 103, and has a hole 51 through which gas passes. The number and size of the holes 51 are arbitrary, but if the number of the holes 51 is large and large, the flow resistance of the fan 101 decreases, but the strength of the ribs 201c decreases. On the other hand, when the number of holes 51 is small and small, the strength of the rib 201c is improved, but the flow path resistance of the fan 101 is increased. Therefore, the hole 51 may be formed in consideration of the cooling capacity of the fan 101 and the like. By forming the hole 51 in the rib 201c, gas can flow as indicated by the arrow 24, and a path from the intake port 111 to the exhaust port 112 is formed. Further, the rib 201c functions as a heat exchange unit that receives heat from the gas when the gas passes through the hole 51.

  FIG. 14 is an explanatory diagram of the cooling unit 100 having ribs different from the ribs of FIG. FIG. 14A is a cross-sectional view of the cooling unit 100. FIG. 14B is a development view of the cooling unit 100. The rib 201d is provided along the circumferential direction of the circle formed by the hollow portion 104. In such a configuration, there is a portion where the rib 201d does not exist when cut along a plane perpendicular to the optical axis 4. In such a place, since the secondary moment of the cross-section remains small, there is a risk that the moment M caused by the weight of the lens barrel 2 may be affected. However, the rigidity of the cooling unit 100 is improved as compared with the case where the rib 201d is not provided. On the other hand, by providing the rib 201d, the cooling unit 100 has a very strong structure against the force of squeezing. Further, the gas can flow as indicated by the arrow 25, and a path from the intake port 111 to the exhaust port 112 is formed. Since the rib 201d is provided along such a gas flow, heat exchange is efficiently performed.

  Moreover, the rib 201d may be provided while meandering along the circumferential direction of the circle formed by the hollow portion 104, as shown in FIG. The rib 201e is provided such that the angle with respect to a plane perpendicular to the optical axis 4 changes periodically. In such a configuration, there is a portion where the rib 201e does not exist when cut along a plane perpendicular to the optical axis 4. In such a place, since the secondary moment of the cross-section remains small, there is a risk that the moment M caused by the weight of the lens barrel 2 may be affected. However, the rigidity of the cooling unit 100c is improved as compared with the case where the rib 201e is not provided. On the other hand, by providing the rib 201e, the cooling unit 100d has a very strong structure against the force of squeezing. Further, the gas can flow as indicated by the arrow 26, and a path from the intake port 111 to the exhaust port 112 is formed. Since the rib 201d is provided along such a gas flow, heat exchange is efficiently performed.

  Whether the rib 201d or the rib 201e is provided in place of the rib 201 depends on the magnitude of the moment M due to the weight of the lens barrel 2, the amount of heat to be exhausted, and the force for crushing the cooling unit 100. It may be determined in consideration of how much the effect is.

  FIG. 15 is an explanatory diagram of the cooling unit 100 having ribs different from the ribs of FIG. FIG. 15A is a cross-sectional view of the cooling unit 100. FIG. 15B is a development view of the cooling unit 100. The ribs 201f and the ribs 201g are provided alternately. The rib 201f is provided on the lens barrel side wall 110a, and a gap is formed between the rib 201f and the imaging device side wall 110b. The rib 201g is provided on the imaging device side wall 110b, and a gap is formed between the rib 201g and the lens barrel side wall 110a. As indicated by an arrow 27, the gas flowing into the hollow portion 104 alternately passes through the gap on the imaging device side wall 110b side and the gap on the lens barrel side wall 110a side, and is discharged from the exhaust port 112. Since the gas flows through the hollow portion 104 while meandering, it is easy to touch the rib 201f and the rib 201g. The rib 201f and the rib 201g function as a heat exchange unit that receives heat from the gas.

  Further, as shown in FIG. 15C and FIG. 15D, the ribs 201f and the ribs 201g may be provided alternately so that the perpendicular to the optical axis 4 is not perpendicular to the plane. In FIG. 15C, the rib 201h is provided on the imaging device side wall 110b, and a gap is formed between the rib 201h and the lens barrel side wall 110a. The rib 201i is provided on the lens barrel side wall portion 110a, and a gap is formed between the rib 201i and the imaging device side wall portion 110b. The gas flowing into the hollow portion 104 alternately passes through the gap on the lens barrel side wall portion 110a side and the gap on the imaging device side wall portion 110b side and is discharged from the exhaust port 112, as indicated by an arrow 28. Since the gas flows through the hollow portion 104 while meandering, it is easy to touch the rib 201h and the rib 201i. The rib 201h and the rib 201i function as a heat exchange unit that receives heat from the gas.

  In FIG. 15D, the rib 201j is provided on the lens barrel side wall 110a, and a gap is formed between the rib 201j and the imaging device side wall 110b. The rib 201k is provided in the imaging device side wall 110b, and a gap is formed between the rib 201k and the lens barrel side wall 110a. The gas flowing into the hollow portion 104 alternately passes through the gap on the imaging device side wall portion 110b side and the gap on the lens barrel side wall portion 110a side and is discharged from the exhaust port 112, as indicated by an arrow 30. Since the gas flows through the hollow portion 104 while meandering, it is easy to touch the rib 201j and the rib 201k. The rib 201j and the rib 201k function as a heat exchange unit that receives heat from the gas by touching the gas.

  In the cooling unit described with reference to FIG. 15, the rib is provided so as to exist when cut along a plane perpendicular to the optical axis 4. With such a configuration, a portion having a small cross-sectional secondary moment is eliminated, so that a highly rigid cooling unit 100 can be realized. Therefore, it is possible to provide the user with a high-quality image by suppressing the relative inclination between the photographing optical system 3 and the image sensor 6.

  FIG. 16 is an explanatory diagram of the cooling unit 100 in which the fan 101 is provided in a phase different from that in FIG. FIG. 16A is a side view of the imaging apparatus 1. FIG. 16B is a cross-sectional view taken along the line DD of FIG. 16, the same members as those in FIG. 12 are denoted by the same reference numerals. Note that the ribs described in FIGS. 13 to 15 may be used instead of the ribs 201a and 201b.

  The imaging element 6 is arranged so that the horizontal direction of the imaging area 40, which is the area through which the light beam condensed on the imaging element 6 in the cooling unit 100 passes, is the long side and the vertical direction is the short side. The intake port 111 is provided at the position on the right side of the cylinder exterior part 103, and the exhaust port 112 is provided between the top and the right part of the cylinder exterior part 103. The fan 101 is disposed on the right side of the hollow portion 104 surrounded by the inner cylindrical portion 102, the cylindrical exterior portion 103, the lens barrel side wall portion 110a, and the imaging device side wall portion 110b. In other words, the fan 101 is provided on a straight line parallel to the long side of the image sensor 6. The straight line parallel to the long side of the image sensor 6 is a horizontal line in FIG.

  When the fan 101 operates, the suction force indicated by the arrow 31 a is activated, and gas is drawn into the fan 101 from the outside of the imaging device 1 through the intake port 111. The gas discharged from the fan 101 flows as indicated by an arrow 31b, and is finally discharged from the exhaust port 112 as indicated by an arrow 31c. Since the gas flows through the hollow portion 104 while meandering, the gas easily touches the rib 201a and the rib 201b. The rib 201a and the rib 201b function as a heat exchange unit that receives heat from the gas.

  By providing the fan 101 on the right side, the cooling capacity corresponding to the size of the fan 101 is limited. However, by providing the fan 101 at the right part, the ribs 201b can be provided at the top and bottom of the tube exterior part 103. That is, the rib 201 b is provided on a straight line parallel to the short side of the image sensor 6. The straight line parallel to the short side of the image sensor 6 is a vertical line in FIG. Thereby, the cooling unit 100 can be made to have a stronger structure against the moment M caused by the weight of the lens barrel 2.

  Whether to implement the configuration of FIG. 16 instead of the configuration of FIG. 12 may be selected based on whether priority is given to the size of the fan or rigidity to the moment M.

  FIG. 17 is an explanatory diagram of the camera system 1000 of the present embodiment. FIG. 17A is a side view of the camera system 1000. FIG. 17B is a central sectional view of the camera system 1000. FIG.17 (c) is the EE sectional view taken on the line of Fig.17 (a). FIG. 18 is an explanatory diagram of the cooling unit 100. FIG. 18A is a perspective view of the cooling unit 100. FIG. 18B is a perspective view of the cooling unit 100 with the tube exterior portion 103 removed. In addition, although it is general that the cross-sectional view shows the cut surface by hatching, in this embodiment, the cross-sectional view is shown without being hatched because it becomes complicated. Further, in the present embodiment, the same members as those in the first embodiment and the second embodiment are denoted by the same reference numerals, and redundant description is omitted.

  The cooling unit 100 is provided between the imaging device 1 and the lens barrel 2 so as to surround the optical axis 4 and the internal space 1a. The cooling unit 100 includes an inner cylinder portion 102 and a cylinder exterior portion 103. Further, the cylinder exterior portion 103 has an intake port 111 and an exhaust port 112. The cooling unit 100 includes a fan 301 having a configuration different from that of the first and second embodiments. The fan 301 is provided around the inner cylinder portion 102 and is driven and controlled by the control unit 5.

  As shown in FIG. 17C, the fan 301 includes a rotating blade 301a, a driving magnet 301b, and a driving coil 301c in this order from the cylinder exterior portion 103 side. In the fan 301, the fixed driving coil 301c is energized, so that the driving magnet 301b and the rotary blade 301a engaged with the driving magnet 301b rotate the optical axis 4 or an axis parallel to the optical axis 4 as the rotational axis. Rotate as When the fan 301 operates, a suction force indicated by an arrow 308 in FIG. 17B is activated, and gas is drawn into the intake port 111 from the outside of the imaging device 1. The drawn gas is discharged from the exhaust port 112 as indicated by an arrow 309 in FIG. The fan 301 includes a heat exchanging unit 300a that is provided on the imaging element 6 side with respect to the rotary blade 301a in the optical axis direction, and transfers heat generated in the imaging device 1 to the gas flowing in by the fan 301.

  In the following description, the drive magnet 301b is described as a movable member for driving the fan 301, and the drive coil 301c is described as a fixed member for driving the fan 301. However, the present invention is not limited to this. Not. The present invention is effective even in an imaging apparatus including a driving coil as a driving movable member and a driving magnet as a driving fixing member.

  In FIG. 17C, the center line 20 of the image sensor 6 is a long side center line 20 a that is the center line of the long side of the image sensor 6 and a short side center line 20 b that is the center line of the short side of the image sensor 6. It consists of two. The imaging area (non-component arrangement area) 40 is an area through which a light beam condensed on the imaging element 6 in the cooling unit 100 passes. If the parts are arranged in the imaging region 40, the photographic light flux is blocked, and so-called vignetting occurs in which a sufficient amount of light cannot be collected on the imaging device 6. For this reason, in the cooling unit 100, it is preferable to arrange the parts while avoiding the imaging region 40. Since the electrical contact portion 18 is normally provided on the surface where the imaging device 1 and the lens barrel 2 are in contact, it does not appear in the cross-sectional view, but in this embodiment, the contact between the imaging device 1 and the lens barrel 2. It is shown because it also includes contact pins that are electrical contacts on the surface.

  FIG. 19 is a diagram for explaining the arrangement of the drive coil 301c. FIG. 19A shows a case where the driving coil 301c is arranged so that the diagonal line 21 of the image sensor 6 passes through the center 35 of the driving coil 301c. FIG. 19B shows a case where the driving coil 301c is arranged so that the diagonal line 21 of the image sensor 6 passes through a portion different from the center 35 of the driving coil 301c. FIG. 19C shows a case where the drive coil 301 c is arranged so as to avoid the diagonal line 21 of the image sensor 6.

  In FIG. 19 (c), a part of the inner cylindrical portion 102 can be cut away while avoiding the imaging region 40, so the size of the inner cylindrical portion 102 is shown in FIGS. 19 (a) and 19 (b). Compared with size 31, size 33 can be reduced. Thereby, the size of the cooling unit 100 can be reduced to a size 34 as compared with the size 32 shown in FIG. 19A or 19B. Further, since the driving magnet 301b and the driving coil 301c are not made small, the driving force of the fan 101 is not impaired, and the cooling capacity of the cooling unit 100 is not lowered. That is, as shown in FIG. 19C, by arranging the driving coil 301 c so as to avoid the diagonal line 21 of the imaging device 6, it is possible to reduce the size of the imaging device 1 while suppressing a decrease in cooling capacity. .

  Therefore, as shown in FIG. 19C, it is preferable to dispose the driving coil 301c so as to avoid the diagonal line 21 of the imaging device 6 in order to downsize the cooling unit 100 in the radial direction.

  In FIG. 19, six drive coils 301c are provided, but the present invention is not limited to this. By disposing the driving coil 301c so as to avoid the diagonal line 21 of the image pickup device 6, it is possible to obtain the above-described miniaturization effect.

  Hereinafter, the case where the number of the drive coils 301c is changed will be described with reference to FIG. FIG. 20 is a cross-sectional view of the cooling unit 100. FIG. 20A and FIG. 20B show a case where the number of driving coils 301c is three. FIG. 20C and FIG. 20D show the case where the number of drive coils 301c is four. FIG. 20E and FIG. 20F show the case where the number of drive coils 301c is five.

  FIG. 20A shows a case where the driving coil 301c is arranged so that the diagonal line 21 of the image sensor 6 passes through the driving coil 301c. FIG. 20B shows a case where the drive coil 301 c is arranged so as to avoid the diagonal line 21 of the image sensor 6. In FIG. 20B, the driving coil 301 c can be disposed on the inner side in the radial direction of the cooling unit 100. Therefore, the size of the cooling unit 100 can be reduced to the size 34 compared to the size 32 shown in FIG.

  FIG. 20C shows a case where the driving coil 301c is arranged so that the diagonal line 21 of the image sensor 6 passes through the driving coil 301c. FIG. 20D shows a case where the drive coil 301 c is arranged so as to avoid the diagonal line 21 of the image sensor 6. In FIG. 20D, the driving coil 301 c can be arranged on the inner side in the radial direction of the cooling unit 100. Therefore, the size of the cooling unit 100 can be reduced to the size 34 compared to the size 32 shown in FIG.

  FIG. 20E shows a case where the driving coil 301c is arranged so that the diagonal line 21 of the image sensor 6 passes through the driving coil 301c. FIG. 20F shows a case where the drive coil 301 c is arranged so as to avoid the diagonal line 21 of the image sensor 6. In FIG. 20 (f), the driving coil 301 c can be arranged inside in the radial direction of the cooling unit 100. Therefore, the size of the cooling unit 100 can be reduced to the size 34 compared to the size 32 shown in FIG.

  Thus, even when the number of drive coils 301c is changed, the cooling unit 100 can be downsized in the radial direction by arranging the drive coils 301c so as to avoid the diagonal line 21 of the image sensor 6. It is.

  Hereinafter, a preferred arrangement of the electrical contact portion 18 and the driving coil 301c will be described with reference to FIG. FIG. 21 is a cross-sectional view of the cooling unit 100. In the cooling unit 100 of FIG. 21, two driving coils 301c are provided. Wiring or the like for use in the electrical contact portion 18 is disposed around the electrical contact portion 18, and a circuit or the like for driving the drive coil 301c is provided around the drive coil 301c. If the driving coil 301c and the electrical contact portion 18 are provided at the same phase in the rotation direction, the influence of noise is exerted on the wiring and the circuit. It is preferable.

  In general, the electrical contact portion 18 is often provided at the lower part of the image sensor 6 as shown in FIG. 21 or at the upper part of the image sensor 6 in a cross section perpendicular to the optical axis 4. Therefore, when two drive coils 301 c are provided as shown in FIG. 21, the drive coil 301 c is preferably arranged so as to be parallel to the short side of the image sensor 6. Even when the number of driving coils 301c is not two, it is preferable that the driving coils 301c are arranged so as not to overlap the electrical contact portion 18 in the radial direction with the optical axis 4 as the center.

  As described above, considering that it is preferable to dispose the driving coils 301c so as to avoid the electrical contact portion 18, the number of the driving coils 301c is preferably two or three. When the number of the drive coils 301c is two, it is preferable that the drive coils 301c are arranged so as to be parallel to the short side of the image sensor 6 as shown in FIG. When the number of driving coils 301c is three, as shown in FIG. 20B, one is arranged so as to be parallel to the short side of the image sensor 6, and the other is evenly arranged on the circumference. It is preferable to arrange.

  As described above, by disposing the driving coil 301c so as to avoid the diagonal line 21 of the image sensor 6, the cooling unit 100 can be reduced in size without reducing the cooling capacity.

  In the present embodiment, a description will be given of an arrangement of the driving coil and the driving magnet that is different from that of the third embodiment. FIG. 22 is an explanatory diagram of the camera system 1000 of the present embodiment. FIG. 22A is a side view of the camera system 1000. FIG. 22B is a central sectional view of the camera system 1000. In the present embodiment, the same members as those in the first to third embodiments are denoted by the same reference numerals, and redundant description is omitted.

  The cooling unit 100 is provided between the imaging device 1 and the lens barrel 2 so as to surround the optical axis 4 and the internal space 1a. The cooling unit 100 includes an inner cylinder portion 102 and a cylinder exterior portion 103. Further, the cylinder exterior portion 103 has an intake port 111 and an exhaust port 112. The cooling unit 100 includes a fan 401 having a configuration different from that of the first and second embodiments. The fan 401 is provided around the inner cylinder portion 102 and is driven and controlled by the control unit 5.

  The fan 401 includes a rotating blade 401a, a driving magnet 401b, and a driving coil 401c. In this embodiment, the drive magnet 401b and the drive coil 401c are arranged so as to overlap in the optical axis direction. With these as power sources, the fan 401 rotates about the optical axis 4 or an axis parallel to the optical axis 4 as a rotation axis.

  FIG. 23 is a sectional view taken along line FF in FIG. FIG. 23A shows a case where the driving coil 401c is arranged so that the long-side center line 20a of the image sensor 6 passes through the center of the driving coil 401c. FIG. 23B shows a case where the driving coil 401c is arranged so that the short-side center line 20b of the image sensor 6 passes through the center of the driving coil 401c.

  In FIG. 23A, the drive coil 401 c is disposed on an extension line of the diagonal line 21 of the image sensor 6. In FIG. 23B, the driving coil 401 c is not disposed on the extension line of the diagonal line 21 of the image sensor 6. Therefore, in FIG. 23B, a part of the inner cylindrical portion 102 can be cut away while avoiding the imaging region 40. Therefore, the size of the inner cylindrical portion 102 is compared with the size 62 shown in FIG. The size can be reduced to 64. Thereby, the size of the cooling unit 100 can be reduced to the size 63 as compared with the size 61 shown in FIG.

  As described above, even when the driving magnet 401b and the driving coil 401c are arranged so as to overlap in the optical axis direction, by arranging the driving coil 401c so as to avoid the diagonal line 21 of the image sensor 6, The cooling unit 100 can be reduced in size.

  Further, since the driving magnet 401b and the driving coil 401c are not made small, the driving force of the fan 401 is not impaired and the cooling capacity of the cooling unit 100 is not lowered. That is, as shown in FIG. 23B, by arranging the driving coil 401c so as to avoid the diagonal line 21 of the image sensor 6, the cooling unit 100 can be reduced in size without reducing the cooling capacity.

  Furthermore, a preferred arrangement of the drive magnet 401b and the drive coil 401c in this embodiment will be described with reference to FIG. FIG. 24 is a central cross-sectional view of the camera system 1000 when the driving magnet 401b and the driving coil 401c are attached in the optical axis direction opposite to FIG. 22B. In other words, in FIG. 24, the driving magnet 401b (and the rotating blade 401a) is disposed on the imaging device 1 side, and the driving coil 401c is disposed on the lens barrel 2 side.

  Heat exchange in the cooling unit 100 is performed in the heat exchange unit 300a. In the configuration of FIG. 24, it is possible to shorten the thermal path from the heat source such as the image sensor 6 and the circuit board around it to the heat exchanging unit 300a as compared with the configuration of FIG. . That is, as shown in FIG. 24, the driving coil 401c and the driving magnet 401b are arranged on the front side in the optical axis direction with respect to the rotor blade 401a, so that the driving coil 401c and the driving magnet 401c are heated from the heat source. It does not become the thermal resistance up to the exchange part 300a. Therefore, the configuration of FIG. 24 makes it easy to transfer heat from the heat generation source to the heat exchange unit 300a.

  In addition, in order to perform heat exchange on the heat exchanging unit 300a, the driving coil 401c hinders heat exchange by providing the driving coil 401c closer to the lens barrel 2 than the rotating blade 401a as shown in FIG. In other words, the heat exchanging unit 300a can have a large area. Therefore, with the configuration of FIG. 24, it is possible to increase the amount of heat exchange compared to the configuration of FIG. Therefore, the driving coil 401c is preferably provided on the lens barrel 2 side with respect to the rotating blade 401a.

  As described above, by disposing the driving coil 401c so as to avoid the diagonal line 21 in the image sensor 6, the cooling unit 100 can be reduced in size without reducing the cooling capacity.

  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.

DESCRIPTION OF SYMBOLS 1 Imaging device 2 Lens barrel 3 Imaging optical system 4 Optical axis 5 Control part (electronic component)
7 First display device (electronic component)
100 Cooling unit (cooling device)
DESCRIPTION OF SYMBOLS 101 Fan 102 Inner cylindrical part 103 Cylindrical exterior part 104 Hollow part 111 Intake port 112 Exhaust port 202 Heat transfer means 301 Fan

Claims (20)

A hollow cooling device that is detachably attached to a lens barrel including an imaging optical system, and an imaging device including an electronic component and an imaging element, and surrounds the optical axis of the imaging optical system,
Heat transfer means for transferring heat generated from the electronic component or the image sensor to the cooling device;
An inner periphery formed to surround the optical axis;
An outer periphery of the cooling device, and an outer peripheral portion formed so as to surround the optical axis;
A hollow portion formed between the inner peripheral portion and the outer peripheral portion and serving as a gas flow path;
The outer peripheral portion includes an intake port for allowing gas to flow into the hollow portion, and an exhaust port for discharging gas from the hollow portion,
The cooling device, wherein the hollow portion is provided with a fan that applies a driving force to the gas inside the hollow portion to flow from the intake port to the exhaust port.   The fan includes a rotor blade and a fan air inlet facing the air inlet, and takes in gas from the fan air inlet along the rotation axis of the rotor blade, and draws the gas in a direction perpendicular to the rotation axis. The cooling device according to claim 1, wherein the cooling device is a centrifugal fan for discharging.   The cooling device according to claim 1 or 2, wherein the heat transfer means transfers heat generated from the electronic component or the imaging device to the inner peripheral portion.   The cooling device according to any one of claims 1 to 3, wherein the inner peripheral portion is configured by a member having a higher thermal conductivity than a member configuring the outer peripheral portion.   5. The cooling device according to claim 1, wherein the inner peripheral portion is made of a metal including at least one of magnesium, aluminum, and copper.   The cooling device according to claim 1, wherein the outer peripheral portion is made of resin.   The cooling device according to any one of claims 1 to 6, wherein a flow path capable of entering and exiting a gas is not formed between the hollow portion and the inside of the imaging device. The exhaust port is provided at the top of the outer periphery,
The cooling device according to claim 1, wherein the intake port is provided at a lowermost portion of the outer peripheral portion. A cover member that covers the intake port;
The cooling device according to claim 8, wherein the cover member includes a cover intake port at a position not facing the intake port.   The cooling device according to any one of claims 1 to 9, wherein a rib is provided inside the hollow portion so as to form a gas flow path.   The cooling device according to claim 10, wherein the rib is provided so as to exist on a predetermined plane passing through the hollow portion and perpendicular to the optical axis. The rib is provided in the inner peripheral part and forms a gap with the outer peripheral part, and a second rib is provided in the outer peripheral part and forms a gap with the inner peripheral part. And ribs,
The cooling device according to claim 10 or 11, wherein the first rib and the second rib are provided alternately. The rib is provided on a wall portion of the hollow portion on the lens barrel side, and forms a gap with the hollow portion on the imaging device side wall portion; and the hollow portion A second rib that is provided on a wall portion of the imaging device side and forms a gap between the hollow portion and the wall portion of the lens barrel.
The cooling device according to claim 10, wherein the first rib and the second rib are provided alternately.   The cooling device according to claim 13, wherein the rib is provided so as not to be perpendicular to the optical axis and a straight line perpendicular to the optical axis.   The cooling device according to any one of claims 10 to 14, wherein the rib is provided along a direction passing through the optical axis and parallel to a short side of the imaging device.   The cooling device according to claim 15, wherein the fan is provided on a straight line passing through the optical axis and parallel to a long side of the imaging element. The fan includes a rotating blade that rotates about the optical axis as a rotation axis, and a plurality of fixing members that are fixed to the inner peripheral portion in order to rotate the rotating blade,
2. The cooling device according to claim 1, wherein the plurality of fixing members are not arranged on diagonal lines of the imaging element in a plane perpendicular to the optical axis.   The imaging apparatus according to claim 17, wherein the plurality of fixing members are disposed on the lens barrel side with respect to the rotary blade. An electrical contact for communicating with the lens barrel or the imaging device;
The imaging device according to claim 18 or 19, wherein the plurality of fixing members are arranged so as not to overlap the electrical contact portion in a radial direction centered on the optical axis. Electronic components,
An image sensor;
A hollow cooling device provided between the imaging optical system and the imaging device and surrounding the optical axis of the imaging optical system;
Heat transfer means for transferring heat generated from the electronic component or the image sensor to the cooling device,
The cooling device includes an inner peripheral portion formed so as to surround the optical axis, an outer periphery portion that is an exterior of the cooling device, and is formed so as to surround the optical axis, the inner peripheral portion, and the outer peripheral portion. The outer peripheral portion includes an intake port for allowing gas to flow into the hollow portion, and an exhaust port for discharging gas from the hollow portion. ,
The imaging device according to claim 1, wherein a fan is provided in the hollow portion to give a driving force to the gas inside the hollow portion to flow from the intake port to the exhaust port.