Imaging device

Abstract

To provide an imaging apparatus that satisfies heat dissipation performance while suppressing the size increase of the apparatus.SOLUTION: In the imaging apparatus including an imaging element, a duct 210 has a first air vent 232 formed between a gripping portion 22a and a mounting portion 26 of a front face 22 of an exterior member, extends from a front face side toward a rear face side in an optical axis direction, passes through an area between an imaging element substrate 11 and a control circuit substrate 12 from an upper face side toward a bottom face side, and is connected to a second air vent formed on an opposite side of the first air vent 232 across the optical axis and formed on a front face 22 or a side face 25 of the bottom surface side of outer members 21-25, a heat dissipation fan 231 is arranged in the duct 210 arranged on the bottom face side of the imaging element substrate 11 and the control circuit substrate 12.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to an imaging device having a heat dissipation structure for heat generated from a heat source. [Background technology]

[0002] 2. Description of the Related Art In recent years, with the demand for miniaturization of electronic devices, there has been a remarkable trend toward miniaturization and high density of mounted components inside the devices.

[0003] On the other hand, there is an ever-increasing demand for more sophisticated functions in image capture devices, particularly for higher performance video functions, and the amount of heat generated by the devices is on the rise.

[0004] When shooting video in a high-temperature environment, the temperature rise inside the imaging device can cause malfunctions and performance degradation of mounted components, and ultimately cause failure of the imaging device.

[0005] Furthermore, in recent years, imaging devices that perform blur correction by moving an imaging element in a direction perpendicular to the optical axis direction to improve image quality have become widespread.

[0006] Even in such image capture devices that perform shake correction, sufficient heat dissipation is required because heat generated in the image capture element when the shake correction mechanism is operating, when continuous shooting is performed, or when video is captured affects image quality.

[0007] Therefore, when the amount of heat dissipated by natural radiation is insufficient for the amount of heat generated by the imaging device, a heat dissipation structure that uses forced air cooling using a fan is used.

[0008] Patent Document 1 discloses a device that uses a fan disposed on the bottom surface of the camera to exhaust air in a gap between a heat sink for an imaging element and an opposing heat sink for a circuit board to the outside.

[0009] Moreover, Patent Document 2 discloses an apparatus in which an L-shaped heat sink / duct having a blower fan is disposed between an imaging element and a main board. [Prior art documents] [Patent documents]

[0010] [Patent Document 1] JP 2017-228876 A [Patent Document 2] JP 2015-204422 A Summary of the Invention [Problem to be solved by the invention]

[0011] However, the device disclosed in the above-mentioned Patent Document 1 has a problem in that external dust and dirt can easily get into the device because the external air is directly taken into the device.

[0012] Furthermore, in the device disclosed in Patent Document 2, a fan is disposed in a part of the heat sink / duct, which causes a problem of an increase in size of the device.

[0013] The present invention has been made in view of the above problems, and an object of one embodiment of the present invention is to provide an imaging device that satisfies heat dissipation performance while suppressing an increase in size of the device. [Means for solving the problem]

[0014] An imaging device having a gripping part, a mount part to which an interchangeable lens is attached, and an imaging element, the imaging device comprising: a control circuit for controlling the imaging device; a display panel arranged on a rear side of an exterior member; and a heat dissipation fan arranged on a bottom side of the exterior member, an imaging element board on which the imaging element is mounted, a control circuit board on which the control circuit is mounted, and the display panel are arranged in this order from the front side to the rear side in the optical axis direction; a duct having a first ventilation hole formed between the gripping part and the mount part on the front side of the exterior member extends from the front side to the rear side in the optical axis direction, passes through a region between the imaging element board and the control circuit board from the top side to the bottom side, and is connected to a second ventilation hole formed on the opposite side of the optical axis to the first ventilation hole and formed on the front or side of the bottom side of the exterior member, and the heat dissipation fan is arranged in the duct arranged on the bottom side of the imaging element board and the control circuit board. the duct is connected to a first duct portion extending from the front side to the rear side, a second duct portion extending from the top side to the bottom side and passing through a region between the image pickup element board and the control circuit board, and a third duct portion having a second air vent formed on the front or side of the bottom side of the exterior member, an electronic viewfinder is disposed on the exterior member on the top side of the image pickup device, and a recording medium is mounted on the control circuit board, the second duct portion has a side extension portion facing and thermally connected to the recording medium, and a thermally connected top extension portion facing the electronic viewfinder, the image pickup element is thermally connected to the front side of the second duct portion via a first thermal conductive member, the control circuit is thermally connected to the rear side of the second duct portion via a second thermal conductive member, the recording medium is thermally connected to the side extension portion via a third thermal conductive member, and the electronic viewfinder is thermally connected to the top extension portion via a fourth thermal conductive member. It is characterized by the fact that Effect of the Invention

[0015] According to one embodiment of the present invention, it is possible to satisfy heat dissipation performance while suppressing an increase in the size of the device. [Brief description of the drawings]

[0016] [Figure 1] FIG. 1 is a perspective view of a digital camera 200 according to a first embodiment of the present invention; [Diagram 2] FIG. 1 is an exploded perspective view of a main part of a digital camera 200 according to a first embodiment of the present invention; [Diagram 3] FIG. 1 is a schematic diagram showing a main part of a digital camera 200 according to a first embodiment of the present invention; [Figure 4] FIG. 1 is an external perspective view of a duct 210 according to a first embodiment of the present invention. [Diagram 5] Layout diagram of duct 210 according to the first embodiment of the present invention. [Figure 6] FIG. 1 is an exploded perspective view of a duct 210 according to a first embodiment of the present invention; [Figure 7] 1 is a cross-sectional view of a duct 210 according to a first embodiment of the present invention; [Figure 8]FIG. 2 is an explanatory diagram of a heat dissipation mechanism 220 according to the first embodiment of the present invention. [Figure 9] Modifications of the main board 12 according to the first embodiment of the present invention [Figure 10] Block diagram of the present invention DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0017] Exemplary embodiments of the technology of the present disclosure will be described in detail below with reference to the drawings.

[0018] However, the dimensions, materials, shapes and relative arrangement of the components described below are to be modified as appropriate depending on the configuration and various conditions of the device to which the invention is applied.

[0019] Therefore, it is not intended that the scope of the present invention be limited to the following description.

[0020] For configurations and steps that are not particularly illustrated or described, techniques well known or publicly known in the art may be applied. Furthermore, duplicated explanations may be omitted.

[0021] It is noted that in the drawings, the same reference numbers are used between the drawings to indicate identical or functionally similar elements.

[0022] (Block diagram showing an example of the configuration of a digital camera 400 according to the present invention) FIG. 10 is a block diagram showing an example of the configuration of a digital camera 400 according to the present invention.

[0023] The shutter 410 is a focal plane shutter that can freely control the exposure time of an image capture unit 411, which will be described later. This control is performed by a system control unit 420, which will be described later.

[0024] The imaging unit 411 is an imaging device that has an imaging surface on which an object image (optical image) that has passed through the lens 501 is formed, and outputs an electrical signal (analog signal) corresponding to the optical image on the imaging surface by photoelectric conversion.

[0025] The imaging unit 411 may be a CCD (Charge Couple Device) or a CMOS (Complementary MOS) sensor.

[0026] The A / D converter 412 is a signal conversion means used for converting an analog signal output from the imaging unit 411 into a digital signal.

[0027] The image processing unit 413 is an image calculation means that performs resizing processing such as predetermined pixel interpolation and reduction and color conversion processing on the digital signal from the A / D converter 412 or the digital signal from the memory control unit 422 described later, to generate image data.

[0028] Based on the calculation results obtained by the image processing unit 413, the system control unit 420 controls the aperture position and the lens position.

[0029] The image processing unit 413 further performs calculation processing using the image data, and performs TTL type AWB (auto white balance) processing based on the obtained calculation results.

[0030] The system control unit 420 is a control unit that is made up of at least one processor or circuit, and controls the entire digital camera 400 .

[0031] Each process of the present invention is realized by executing a program recorded in a non-volatile memory 423, which will be described later.

[0032] The memory 421 is a storage means for temporarily recording the digital signal obtained by the imaging unit 411 and converted by the A / D converter 412 and the image data generated by the image processing unit 413 .

[0033] The memory 421 has a storage capacity sufficient to store a predetermined number of still images and a predetermined period of moving images and audio.

[0034] The memory control unit 422 is a memory control means that controls transmission and reception of data controlled by the system control unit 420 to and from the A / D converter 412 , the image processing unit 413 , and the memory 421 .

[0035] The digital signal output from the A / D converter 412 is written directly into the memory 421 via the image processing unit 413 and the memory control unit 422 , or via the memory control unit 422 only.

[0036] The non-volatile memory 423 is an electrically erasable and recordable read-only storage means, and stores constants, programs, etc. for the operation of the system control unit 420.

[0037] The system memory 424 is a readable and writable storage means for storing constants and variables for the operation of the system control unit 420, programs read from the non-volatile memory 423, and the like.

[0038] The system timer 425 is a timing unit that measures the time until an auto power off function that turns off various display members (to be described later) is executed, and the exposure time.

[0039] The auto power off function has the function of turning off various display members, which will be described later, to prevent battery consumption when it is determined that the photographer is not operating the digital camera 400.

[0040] The power supply unit 430 is composed of a primary battery such as an alkaline battery or a lithium battery, a secondary battery such as a NiCd battery, a NiMH battery, or a Li battery, an AC adapter, or the like.

[0041] The power supply control unit 431 is made up of a circuit for detecting the power supply unit 430 that serves as the power supply for driving the digital camera 400, a DC-DC converter, a switch circuit for switching the power supply destination, and the like.

[0042] Then, the power supply unit 430 detects whether a battery is attached, the type of battery, and the remaining battery power.

[0043] Furthermore, the power supply control unit 431 controls the DC-DC converter based on the detection result and instructions from the system control unit 420, and supplies the required voltage to the supply destination at the required timing.

[0044] The communication terminal 440 is provided on the digital camera 400 and is electrically connected to a lens communication terminal 506, which will be described later.

[0045] By electrically connecting the communication terminal 440, the system control unit 420 that controls the entire digital camera 400 becomes capable of communicating with the lens 500 described below.

[0046] The recording medium I / F 441 is an interface with a recording medium 600, which will be described later.

[0047] The orientation detection unit 442 detects the orientation of the digital camera 400 with respect to the direction of gravity.

[0048] Based on the orientation detected by the orientation detection unit 442, orientation information can be output indicating whether the image captured by the imaging unit 411 was captured with the digital camera held horizontally or vertically.

[0049] The system control unit 420 can add the orientation information output by the orientation detection unit 442 to the image data.

[0050] The attitude detection unit 442 may be an acceleration sensor, a gyro sensor, or the like.

[0051] If an acceleration sensor and a gyro sensor are used as the attitude detection unit 442, it is also possible to detect the movement of the digital camera 400 (panning, tilting, lifting, whether it is stationary, etc.).

[0052] Eyepiece 443 is the portion where the photographer's eye (object) 700 approaches (comes into contact with) digital camera 400 .

[0053] The eyepiece detection unit 444 is an approach or eyepiece detection sensor that detects the approach (approach) and separation (away) of the eye 700 to the eyepiece unit 443.

[0054] Eyepiece detection unit 444 detects whether eye 700 is placed in proximity to eyepiece unit 443 based on the presence or absence of light reception by a light receiving unit (not shown) of an infrared proximity sensor.

[0055] After detecting eye contact, system control unit 420 determines that the eye is in contact state until it detects eye removal.

[0056] After detecting eye separation, system control unit 420 maintains the eye non-contact state until it detects eye contact.

[0057] The infrared proximity sensor is just an example, and other sensors may be used for eye proximity detection unit 444 as long as they can detect the approach of an eye or an object that can be regarded as an eye.

[0058] The above-mentioned memory 421 also serves as a memory for displaying images (video memory).

[0059] The digital signals and image data written in the memory 421 are displayed on the rear display unit 450 and the EVF 451 via the memory control unit 422 .

[0060] The rear display unit 450 performs display in response to a signal from the memory control unit 422 .

[0061] The EVF 451 performs display according to a signal from the memory control unit 422 when the eye-approach detection unit 444 detects the eye-approach.

[0062] An analog signal generated by the imaging unit 411 is A / D converted by an A / D converter 412, and the digital signal recorded in a memory 421 is sequentially transferred to a rear display unit 450 or an EVF 451 for display.

[0063] This allows real-time live view shooting display.

[0064] The system control unit 420 switches the rear display unit 450 and the EVF 451 between display (display state) / non-display (non-display state) depending on the state detected by the eyepiece detection unit 444 described above.

[0065] When the eyepiece is not in contact with the camera, the image is displayed on the rear display unit 450 and the EVF 451 is not displayed.

[0066] During eye contact, the image is displayed on the EVF 451, and the rear display unit 450 is not displayed.

[0067] The operation unit 460 is a variety of operation members serving as an input unit for receiving operations from the user.

[0068] The operation unit 460 includes various operation members (a mode changeover switch 461, a shutter button 462, a first shutter switch 463, a second shutter switch 464, a touch panel 465, and a power switch 466) which will be described later.

[0069] Moreover, the operation unit 460 is an operation means for inputting various operational instructions to the system control unit 420 .

[0070] A mode changeover switch 461 switches the operation mode of the system control unit 420 between a still image shooting mode, a moving image shooting mode, and the like.

[0071] The still image shooting mode includes an auto shooting mode, an auto scene determination mode, and a manual shooting mode.

[0072] Further, shooting modes included in the still image shooting mode include an aperture priority mode (Av mode), a shutter speed priority mode (Tv mode), and a program AE mode (P mode).

[0073] Similarly, the video shooting mode may include a plurality of shooting modes.

[0074] The shutter button 462 is a button that allows the photographer to give instructions for preparation for shooting and instructions for shooting.

[0075] A first shutter switch 463 is turned on when a shutter button 462 provided on the digital camera 400 is pressed halfway (instruction to prepare for shooting) during operation, and generates a first shutter switch signal SW1.

[0076] The first shutter switch signal SW1 starts photographing preparation operations such as AF (autofocus) processing, AE (auto exposure) processing, and AWB (auto white balance) processing.

[0077] The second shutter switch 464 is turned on when the operation of the shutter button 462 is completed, that is, when the shutter button 462 is fully pressed (a photographing instruction is issued), and generates a second shutter switch signal SW2.

[0078] In the system control unit 420, a signal conversion process is performed in the A / D converter 412 and the image processing unit 413 after reading out an analog signal from the imaging unit 411 in response to a second shutter switch signal SW2.

[0079] Furthermore, the system control unit 420 starts the photographing processing operation up to writing the image data temporarily recorded in the memory 421 to a recording medium 600, which will be described later.

[0080] The touch panel 465 is a device that detects a touch or drag operation by the photographer.

[0081] Here, it is integrated with the rear display unit 450, and operations can be performed by touching the display unit of the rear display unit 450 with a finger.

[0082] The power switch 466 is a switch for switching the power supply ON / OFF. The power supply control unit 431 controls the power supply from the power supply unit 430 by the switching operation of the power switch 466.

[0083] The fan 470 is disposed within a duct which will be described later in the embodiments of the present invention.

[0084] This fan 470 is controlled by the system control unit 420, and expels heat from a heat source inside the digital camera 400 to the outside by using an air current.

[0085] The lens unit 500 is an interchangeable lens that can be attached to and detached from the digital camera 400 .

[0086] Lens 501 is a lens group for generating an optical image (subject image) from subject light reflected by the subject, and is composed of multiple lenses, but in this figure, for simplicity, only one lens is shown.

[0087] The lens communication terminal 506 is a communication terminal through which the lens unit 500 communicates with the digital camera 400 .

[0088] As described above, the lens unit 500 is capable of communicating with the system control unit 420 that controls the entire digital camera 400 by electrically connecting the lens communication terminal 506 and the communication terminal 440 .

[0089] This enables the system control unit 420 to communicate with the lens system control circuit 505 and the aperture drive circuit 504 to control the position of the aperture 503 and the focus state of a real image obtained by displacing the lens 501 .

[0090] The recording medium 600 is detachable from the digital camera 400, and is a recording medium such as a memory card for recording captured images.

[0091] For example, there are SD cards, FLASH (registered trademark) memories, hard disks, and the like.

[0092] [First embodiment] (Perspective view of digital camera 200) FIG. 1(a) is a front perspective view of a digital camera 200, and FIG. 1(b) is a rear perspective view of the digital camera 200. As shown in FIG.

[0093] Numeral 21 denotes a rear cover, on which are attached various operation members for operating the digital camera 200. Note that since these operation members and display members are not related to the present invention, a description thereof will be omitted.

[0094] Reference numeral 21a denotes a display unit storage section 21a for storing a rear display unit, which will be described later.

[0095] Reference numeral 21b denotes a cover for a recording medium, which is a cover for protecting an opening of an IF for a recording medium that stores a memory card for recording captured images.

[0096] Reference numeral 22 denotes a front base, and 22a denotes a grip portion that is shaped so that the user can easily hold the digital camera 200 with his / her right hand, and is formed integrally with the front base 22.

[0097] Reference numeral 22b denotes an air vent formed in the front base 22 for taking in air for a duct, which will be described later.

[0098] 22d is a tripod mount.

[0099] Reference numeral 23 denotes a top cover, on which are attached various operation members for operating the digital camera 200. Note that since these operation members and display members are not related to the present invention, a description thereof will be omitted.

[0100] Additionally, the top cover 23 is provided with a shoulder display section 33, which is, for example, a liquid crystal panel, for checking various setting conditions.

[0101] Reference numeral 24 denotes a bottom cover, to which a battery cover 24a for attaching and detaching a battery is attached.

[0102] Reference numeral 25 denotes a side cover in which an air vent 25b is formed for exhausting air from a duct, which will be described later.

[0103] Reference numeral 25a denotes a terminal cover, which is a cover for protecting an external communication terminal mounted on a main board (to be described later) for connecting a connection cable with an external device (not shown).

[0104] Reference numeral 26 denotes a mount to which an interchangeable lens (not shown) is attached.

[0105] The axis passing through the center of the mount 26 is the imaging optical axis 0.

[0106] Reference numeral 26a denotes a lens communication terminal, which performs electrical communication with the interchangeable lens.

[0107] Reference numeral 31 denotes a rear display unit formed of, for example, a liquid crystal panel, and a rear LCD unit 31a capable of detecting touch operations on the display surface makes it possible to display and set a preview image of the imaging element and various setting states.

[0108] The rear display unit 31 is a so-called variable angle monitor that is rotatably attached to the digital camera 200 and is stored in a display storage unit 21 a provided in the rear cover 21 .

[0109] Reference numeral 32 denotes a finder, which is a so-called electronic viewfinder, which outputs an image output from an image sensor section (to be described later) to a finder display section so that the user can visually confirm the image to be viewed.

[0110] (A perspective view of the internal structure of the digital camera 200) FIG. 2 is an exploded perspective view of the main parts for explaining the internal structure of the digital camera 200. As shown in FIG.

[0111] As shown in FIG. 2, the exterior of the digital camera 200 is formed by the rear cover 21, the front base 22, the top cover 23, the bottom cover 24, and the side cover 25 described above.

[0112] Inside the digital camera 200, an image sensor unit 11, a main board 12, a duct 210, a shutter 13, and a finder 32 are arranged.

[0113] The imaging element section 11 is composed of a movable unit including a CMOS and a fixed unit (described in detail later).

[0114] Mounted on the main board 12 are a control IC group 12a for controlling imaging signals, a recording medium IF 12b for accommodating an external recording medium, and an external communication terminal 12c for connecting a connection cable to an external device (not shown).

[0115] The external communication terminal 12c is covered with the terminal cover 25a as described above.

[0116] In addition to the above, various electronic components such as ICs, chip resistors, chip capacitors, inductors, transistors, interface connectors, etc. are also mounted (not shown), but their description will be omitted.

[0117] An external communication terminal 22c for connecting a connection cable with an external device (not shown) is attached to the front base 22 and is covered with a terminal cover 25a.

[0118] The finder 32 is provided with a finder display section 32a for displaying an image output from the image sensor section described above.

[0119] A centrifugal fan is built into duct 210, which generates an air flow inside duct 210 (details will be described later).

[0120] The imaging element section 11, the control IC group 12a, the IF for recording medium 12b (memory card), and the finder display section 32a consume particularly large amounts of power and generate a large amount of heat within the digital lamella 200.

[0121] Therefore, the temperature of this component increases rapidly.

[0122] In addition to the heat generated by the device itself, the temperature also rises due to radiant heat from surrounding components.

[0123] The shooting time of the digital camera 200 is limited by the guaranteed operating temperature of each component.

[0124] In order to maintain the longest possible shooting time, the heat sources, that is, the image pickup element section 11, the control IC group 12a, the IF for recording medium 12b (memory card), and the finder display section 32a, are cooled.

[0125] Then, it becomes necessary to take measures to prevent the guaranteed operating temperature from being exceeded.

[0126] Therefore, in the present invention, the duct 210 is disposed so as to be sandwiched between the image pickup device section 11, the main board 12, and the finder 32, which are the heat sources, as shown in FIG.

[0127] Thereby, the heat source is cooled by being brought into thermal contact with the duct 210 by means of a heat dissipation mechanism 220 which will be described later.

[0128] (Thermal connection between ducts and each heat source) FIG. 3 is a schematic diagram for making it easier to understand the positional relationship between the duct 210 and each heat source.

[0129] As shown in the figure, the duct 210 is disposed between the image pickup device section 11 and the control IC group 12 a and the recording medium IF 12 b mounted on the main board 12 , and is located below the finder 32 .

[0130] The ducts are thermally connected to the heat sources by a heat dissipation mechanism 220, which will be described later.

[0131] By arranging the duct 210 so as to be surrounded by each heat source in this manner, the thermal connection with the duct is made in the shortest possible manner, resulting in a configuration in which heat loss due to the thermal connection is minimized.

[0132] (External shape of duct 210) FIG. 4 is an external perspective view of the duct 210, and FIG.

[0133] The external shape of the duct 210 will be described in detail with reference to FIGS.

[0134] As shown in the figure, the duct 210 is composed of a first duct portion 211, a second duct portion 212, and a third duct portion 213.

[0135] The first duct portion 211 is formed so as to be approximately parallel to the photographing optical axis 0 and to be located between the mount 26 and the grip portion 22a.

[0136] The second duct portion 212 is formed approximately perpendicular to the photographing optical axis 0 and between the two heat sources, the image pickup element portion 11 and the control IC group 12 a mounted on the main board 12 .

[0137] In addition, the second duct portion 212 is formed so as to be located below the viewfinder display portion 32a attached to the viewfinder 32, which is also a heat source.

[0138] The third duct portion 213 is formed so as to be approximately parallel to the photographing optical axis and located below two heat sources, the image pickup element portion 11 and the control IC group 12 a mounted on the main board 12 .

[0139] The first duct portion 211 is provided with an air intake port 233 .

[0140] An elastic member (not shown) is provided between the intake port 233 and the ventilation port 22b provided in the front base 22, thereby forming a sealed structure between the intake port 233 and the ventilation port 22b.

[0141] The third duct portion 213 is provided with an exhaust port 232 .

[0142] An elastic member (not shown) is provided between the exhaust port 232 and the ventilation port 25b provided in the side cover 25, thereby forming a sealed structure between the exhaust port 232 and the ventilation port 25b.

[0143] With the above-mentioned configuration, a single sealed space is formed between the ventilation opening 22b and the ventilation opening 25b.

[0144] Therefore, an air flow path is formed, and water droplets, sand, and the like from the outside can be prevented from entering the digital camera 200 .

[0145] The air flow within the duct 210 will be described in detail later.

[0146] (An exploded perspective view showing the configuration of the duct 210) FIG. 6 is an exploded perspective view showing the configuration of the duct 210. As shown in FIG.

[0147] The duct 210 is composed of a duct base 214 which is the duct body, a front duct cover 215, and a bottom duct cover 216.

[0148] The front duct cover 215 and the bottom duct cover 216 are fixed to the duct base 214 with an elastic member (not shown) sandwiched therebetween, whereby the duct 210 is formed as a single sealed space.

[0149] The front duct cover 215 and the bottom duct cover 216 may be fixed in place by any fastening method, such as screws, adhesive, or crimping, as long as the fastening method can be achieved.

[0150] The duct base 214, the front duct cover 215, and the bottom duct cover 216 efficiently diffuse heat from the heat source for cooling.

[0151] Furthermore, duct base 214, front duct cover 215, and bottom duct cover 216 are preferably made of a material with high thermal conductivity and specific gravity that does not affect the weight of digital camera 200, and are made of aluminum metal in this embodiment.

[0152] By constructing the duct 210 from a metal member, it can be used as a ground housing for the digital camera 200, which is also advantageous in terms of noise resistance.

[0153] The duct base 214 is provided with convex fins 214a, which increase the surface area of ​​the duct base 214 and diffuse heat from the heat source, thereby improving the cooling efficiency.

[0154] The duct base 214 is provided with a side extension 214b and a top extension 214c for contacting the record medium IF 12b and the finder display unit 32a, which are heat sources.

[0155] Further, the duct portion 214 is formed with the exhaust port 232 described above.

[0156] The front duct cover 215 is provided with fins 215a having a convex shape similar to that of the duct base 214.

[0157] This increases the surface area of ​​the front duct cover 215, diffusing heat from the heat source and improving cooling efficiency.

[0158] Numeral 231 denotes a centrifugal fan, which is a blowing means for creating an air flow within the duct 210 , and is fixed to the bottom surface of the base duct 214 with screws 234 .

[0159] Reference numeral 231 a denotes a centrifugal fan exhaust port of the centrifugal fan 231 , and 231 b denotes a centrifugal fan intake port of the centrifugal fan 231 .

[0160] (Air flow in duct 210) FIG. 7 is a cross-sectional view of the duct 210 taken along the line AA in FIG.

[0161] In the figure, arrows indicate the flow of air within duct 210 .

[0162] By attaching the front duct cover 215 to the duct base 214, the fins 214a and fins 215a are combined to form the fins 210a.

[0163] This forms an air flow path from the intake port 233 to the centrifugal fan intake port 231b.

[0164] When the centrifugal fan 231 is driven, air drawn in through the air intake 233 passes through the fins 210a.

[0165] At this time, the fins 214a and fins 215a that have been heated by the heat source are cooled.

[0166] The air that has passed through the fins 210a flows into the centrifugal fan intake port 231b.

[0167] The air is then exhausted to the centrifugal fan exhaust port 231 a by blades in the centrifugal fan intake port 231 (not shown) and passes through the exhaust port 232 to the outside of the digital camera 200 .

[0168] In this embodiment, air flows through the intake port 233 and is exhausted through the exhaust port 232 as described above.

[0169] However, if the desired cooling effect can be achieved, the drive of centrifugal fan 231 may be reversed to draw air through exhaust port 232 and exhaust air through intake port 233 .

[0170] In addition, in this embodiment, a centrifugal fan is used as the air blowing means, but this is not limited thereto, and for example, an axial flow fan or the like may be used as long as the intended purpose can be achieved.

[0171] (Explanatory diagram of heat dissipation mechanism 220) 8A and 8B are explanatory diagrams of the heat dissipation mechanism 220, where FIG. 8A is an exploded perspective view and FIG. 8B is a supplementary explanatory diagram of FIG.

[0172] The image pickup device section 11 is composed of a movable unit 11b including a CMOS 11a, and a fixed unit 11c.

[0173] The movable unit 11b is fixed to a base member 11e within the fixed unit 11c.

[0174] Image blur correction is achieved by displacing the movable unit 11b in the X, Y, and θ directions with respect to the photographing optical axis 0 using a coil (not shown) in the movable unit 11b and a magnet (not shown) in the fixed unit 11c.

[0175] Reference numeral 11f denotes a heat dissipation plate within the movable unit 11b, which transfers heat generated in the CMOS 11a to the plate.

[0176] One end of a graphite sheet 11h is connected to the heat dissipation plate 11f, and the other end is connected to a magnet plate 11g in the fixed unit 1c.

[0177] With the above configuration, heat generated in the CMOS 11a is conducted to the magnet plate 11g.

[0178] A first thermally conductive member 222 having elasticity is brought into contact between the magnet plate 11g and the front duct cover 215, and thermally connects the imaging element section 11 and the duct 210.

[0179] Reference numeral 223 denotes a second heat conductive member having elasticity, which is disposed between the control IC group 12 a mounted on the main board 12 and the duct base 214 .

[0180] The control IC group 12a and the duct base 214 are then brought into contact with each other, and the control IC group 12a and the duct 210 are thermally connected to each other.

[0181] Reference numeral 224 denotes a third heat conductive member having elasticity, which is disposed between the IF 12 b for a recording medium mounted on the main board 12 and the side extension portion 214 b of the duct base 214 .

[0182] The IF 12b for the recording medium and the side extension 214b are brought into contact with each other, and the IF 12b for the recording medium and the duct 210 are thermally connected to each other.

[0183] Reference numeral 225 denotes a fourth elastic heat conductive member which is disposed between the viewfinder display portion 32 a in the viewfinder 32 and the top extension portion 214 c of the duct base 214 .

[0184] Therefore, the viewfinder display portion 32a and the duct 210 are thermally connected.

[0185] Specifically, a flexible cable 32b extends from the viewfinder display section 32a and is routed around the bottom surface of the main body 32c of the viewfinder 32.

[0186] The flexible cable 32b routed around the bottom surface and the top extension portion 214c are thermally connected by a fourth heat conductive member 225.

[0187] In the above embodiment, the duct 210 and each heat source are thermally connected by an elastic heat conductive member, but this is not limited thereto.

[0188] For example, there is no limitation to the material, and it may be a graphite sheet, a heat pipe, or the like, as long as the intended purpose can be achieved.

[0189] [Variations] In the first embodiment, the heat source in the digital camera 200, that is, the control IC group 12a and the IF for recording medium 12b, are described as a heat dissipation mechanism mounted on a single board (main board 12).

[0190] However, the invention according to the present disclosure is not limited thereto.

[0191] A modification of the first embodiment will be described below.

[0192] FIG. 9 is a diagram showing a heat dissipation mechanism when the control IC group 12a and the IF for recording media 12b are mounted on separate boards.

[0193] Reference numeral 12d denotes an IF board for a recording medium, which is a board separated from the main board 12. An IF board for a recording medium 12b is mounted on the IF board for a recording medium.

[0194] Therefore, the memory card is inserted and removed from the back of the digital camera 200 in the direction of the main board 12 as shown by the arrow in the figure.

[0195] A third heat conductive member 224 is disposed between the IF 12 b for a recording medium mounted on the IF board for a recording medium and the duct base 214 forming the first duct portion 211 .

[0196] The IF 12b for a recording medium and a duct base 214 forming the first duct portion 211 are brought into contact with each other, and the IF 12b for a recording medium and the duct 210 are thermally connected to each other.

[0197] The control IC group 12a mounted on the main board 12 is thermally connected to the duct 210 via the second thermal conductive member 223 in the same manner as described above.

[0198] In this way, the insertion and removal of the memory card is not necessarily limited to the side of the digital camera 200, and can be changed appropriately according to the specifications of the digital camera 200 without any problems.

[0199] The embodiments have been described above, but the descriptions of the embodiments and modifications are merely examples for explaining the technology of the present disclosure.

[0200] The techniques of the present disclosure can be modified or combined as appropriate without departing from the spirit of the invention.

[0201] Specifically, the present invention is not limited to digital cameras, but can be widely applied to electronic devices and imaging devices with a video shooting function, such as video cameras and network cameras.

[0202] (Comparative data on heat dissipation effect)

[0203] [Table 1]

[0204] Table 1 compares the maximum temperatures reached when recording and shooting at 8K30P in a 23° environment using the digital camera of embodiment 1 and a comparative digital camera that does not have the built-in centrifugal fan 231 and duct 210.

[0205] 8K30P means video capture at 8K at 30 frames per second.

[0206] In the first embodiment, the centrifugal fan 231 is operated at a wind speed of 12 L / min. Liters per minute (L / min) is a unit of volumetric flow rate.

[0207] As shown in Table 1, by incorporating the centrifugal fan 231 and the duct 210, the maximum temperature reached is reduced from 111.5 degrees to 58.6 degrees for the imaging element section 11 and from 95.6 degrees to 89.9 degrees for the main board 12.

[0208] This shows that the temperature rise of the heat source is suppressed.

[0209] Furthermore, if the temperature limit at which a digital camera will stop functioning is set to 95 degrees or lower, the configuration of embodiment 1 makes it possible to achieve unlimited 8K30P shooting in an environment of 23°C.

[0210] The present embodiment of the invention will now be briefly described with reference to FIG.

[0211] The imaging device 200 has a grip portion, a mount portion to which an interchangeable lens is attached, and an imaging element.

[0212] The imaging device 200 includes a control circuit 12a that controls the imaging device, a display panel 31 arranged on the back side of the exterior members 21 to 25, and a heat dissipation fan 231 arranged on the bottom side of the exterior members.

[0213] An imaging element board 11 on which an imaging element is mounted, a control circuit board 12 on which a control circuit is mounted, and a display panel 31 are arranged in this order from the front side to the rear side in the optical axis direction.

[0214] A duct 210 in which a first ventilation port 232 is formed between the grip portion 22a of the front surface 22 of the exterior member and the mount portion 26 extends from the front surface side to the rear surface side in the optical axis direction.

[0215] Then, it passes through the area between the imaging element board 11 and the control circuit board 12 from the top side to the bottom side.

[0216] The second ventilation hole is formed on the opposite side of the optical axis to the first ventilation hole 232 and is connected to a second ventilation hole formed on the front surface or side surface of the bottom surface of the exterior member.

[0217] The heat dissipation fan 231 is disposed in a duct 210 that is disposed on the bottom side of the imaging element board 11 and the control circuit board 12 .

[0218] The duct 210 has a first duct portion 211 extending from the front side to the rear side.

[0219] The duct 210 has a second duct portion 212 that passes through the area between the imaging element board 11 and the control circuit board 12 from the top surface side toward the bottom surface side.

[0220] The duct 210 is connected to a third duct portion 213 having a second ventilation opening 233 formed on the front surface 22 or the side surface 25 on the bottom surface side of the exterior member.

[0221] An electronic viewfinder 32 is disposed on the exterior member 23 on the upper surface side of the imaging device.

[0222] The control circuit board 12 is provided with a recording medium mounted thereon.

[0223] The second duct portion 212 has a side extension portion 214b facing the recording medium and an upper extension portion 214c facing the electronic viewfinder 32.

[0224] The imaging element 200 is thermally connected to the front side of the second duct portion 212 via a first thermal conductive member 222, and the control circuit is thermally connected to the rear side of the second duct portion 212 via a second thermal conductive member 223.

[0225] The recording medium is thermally connected to the side extension 214b via a third thermal conductive member 224, and the electronic viewfinder 32 is thermally connected to the top extension 214c via a fourth thermal conductive member 225.

[0226] It includes a recording medium substrate 12d on which a recording medium is mounted.

[0227] The recording medium is thermally connected to a side surface of the first duct portion 211 via a fifth thermal conductive member.

[0228] Second duct portion 212 has, inside the second duct, first fins 214a formed on a surface of second duct portion 212 opposing a surface with which first heat conducting member 222 abuts.

[0229] The second duct portion 212 has a second fin 215a formed on a surface of the second duct portion 212 opposing the surface with which the second thermally conductive member abuts.

[0230] The heat temperature of the imaging element is higher than the heat temperature of the control circuit 12a.

[0231] The imaging element substrate 11 moves in a direction different from the optical axis for image blur correction.

[0232] The imaging element substrate 11 is moved by a movable mechanism in a direction different from the optical axis O for image blur correction. The movable mechanism constitutes a voice coil motor (VCM) made up of a coil and a magnet.

[0233] The imaging element substrate 11 is driven based on the vibration detection result of an angular velocity detection sensor (gyro) (not shown).

[0234] In order to correct image blur on the imaging surface of the imaging element caused by hand shake by the user, the imaging element substrate 11 is moved in the yaw direction, pitch direction, and roll direction around the optical axis of the imaging optical system.

[0235] The rotation axis of the heat dissipation fan 231 is perpendicular to the optical axis.

[0236] The second ventilation opening 233 formed on the bottom surface side of the exterior member is formed on the front surface 22 or the side surface 25 of the exterior member. [Industrial Applicability]

[0237] The technology disclosed herein is applicable to electronic devices and imaging systems. [Explanation of symbols]

[0238] 11. Image sensor section 11a CMOS 12 Main Board 12a Control IC group 21c, 22b, 25b Vents 200 Digital Camera 210 Duct 210a, 214a, 215a Fins 220 Heat dissipation mechanism 231 Centrifugal Fan 232 Exhaust port 233 Air Intake 222~225 Thermal conductive materials

Claims

1. An imaging device having a gripping section, a mount section to which an interchangeable lens is attached, and an imaging element, the imaging device includes a control circuit that controls the imaging device, a display panel disposed on a rear side of an exterior member, and a heat dissipation fan disposed on a bottom side of the exterior member; an imaging element substrate on which the imaging element is mounted, a control circuit substrate on which the control circuit is mounted, and the display panel are arranged in this order from the front side to the rear side in the optical axis direction; a duct in which a first ventilation hole is formed between the grip portion and the mount portion on the front surface of the exterior member, extends from the front surface side to the rear surface side in the optical axis direction, passes through a region between the image pickup element board and the control circuit board from the top surface side to the bottom surface side, and is connected to a second ventilation hole formed on the opposite side of the optical axis to the first ventilation hole and formed on a front surface or a side surface of the bottom surface side of the exterior member, the heat dissipation fan is disposed in a duct that is disposed on a bottom side of the image pickup element board and the control circuit board, the duct is connected to a first duct portion extending from the front side to the rear side, a second duct portion extending from the top side to the bottom side and passing through a region between the image pickup element board and the control circuit board, and a third duct portion having a second ventilation hole formed on a front surface or a side surface of the bottom side of the exterior member; an electronic viewfinder is disposed on an exterior member on an upper surface side of the imaging device; a recording medium mounted on the control circuit board; the second duct portion has a side extension portion that faces and is thermally connected to the recording medium, and a top extension portion that faces and is thermally connected to the electronic viewfinder, an imaging device characterized in that the imaging element is thermally connected to the front side of the second duct portion via a first thermal conductive member, the control circuit is thermally connected to the rear side of the second duct portion via a second thermal conductive member, the recording medium is thermally connected to the side extension portion via a third thermal conductive member, and the electronic viewfinder is thermally connected to the top extension portion via a fourth thermal conductive member.

2. A recording medium substrate on which a recording medium is mounted, The imaging device according to claim 1 , wherein the recording medium is thermally connected to a side surface of the first duct portion via a fifth thermal conductive member.

3. 3. The imaging device according to claim 1 or 2, wherein the second duct portion has, inside the second duct, a first fin formed on a surface opposite to a surface of the second duct portion against which the first thermal conductive member abuts, and a second fin formed on a surface opposite to a surface of the second duct portion against which the second thermal conductive member abuts.

4. The imaging device according to claim 1 , wherein a heat generation temperature of the imaging element is higher than a heat generation temperature of the control circuit.

5. The imaging device according to claim 1 , wherein the imaging element substrate moves in a direction different from an optical axis for image blur correction.

6. 6. The imaging device according to claim 1, wherein a rotation axis of the heat dissipation fan is perpendicular to an optical axis, and a second ventilation hole formed on a bottom surface side of the exterior member is formed on a front surface or a side surface of the exterior member.

Images