JP6779615B2 - Imaging device - Google Patents

Description

The present invention relates to an image pickup apparatus such as a digital video camera or a digital still camera, and more particularly to an image pickup apparatus having a forced air cooling structure by a fan.

In digital video cameras, digital still cameras, etc., due to recent demands for miniaturization, the placement space of the circuit board on which the image sensor is mounted and the main circuit board on which the electronic components that process control signals and image signals are mounted is small. Therefore, these substrates are arranged in a dense state.

On the other hand, as the image quality becomes higher, the power consumption of the image sensor increases and the amount of heat generated also increases. Generally, the higher the temperature of the image sensor, the lower the performance, so it is necessary to dissipate the heat generated by the image sensor. Further, it is necessary to prevent the heat generated by the electronic components mounted on the main circuit board or the like from being transferred to the image sensor and causing the temperature of the image sensor to rise.

Therefore, there has been proposed an imaging device having an air flow passage for heat dissipation that is opened on one surface of the outer housing and does not communicate with the inside of the outer housing (Patent Document 1). In this proposal, the first space in which the image sensor is arranged and the second space in which the circuit board of the electronic component is arranged are arranged so as to sandwich the air flow passage, and the first space of the air flow passage is arranged. The side is formed of a material with lower thermal conductivity than the second space side.

In addition, a heat radiation duct having an air flow passage that does not communicate with the inside of the device body, which exhausts the air taken in from the intake port to the outside of the device body from the exhaust port, an image sensor, and an electron arranged inside the device body. An image pickup device including a main circuit board on which components are mounted has been proposed. In this proposal, the heat dissipation duct is arranged between the back surface of the light receiving surface of the image sensor and the main circuit board, and the member on the side of the image sensor is formed of a member having a higher thermal conductivity than the member on the side of the main circuit board. (Patent Document 2).

Japanese Patent No. 4264583 Japanese Unexamined Patent Publication No. 2013-93697

In Patent Document 1, the heat generated by the electronic component mounted on the main circuit board is difficult to be transferred to the image sensor, but the heat generated by the image sensor itself is not disclosed. Therefore, the image sensor becomes hot, and the performance may deteriorate.

Further, in Patent Document 2, the main circuit board or the like can be arranged only in the range facing the image sensor. In addition, in order to make it difficult for the heat of the main circuit board to be transferred to the image pickup element, the thermal conductivity of the members of the heat dissipation duct on the side of the main circuit board must be kept low, which is sufficient when the amount of heat generated by the main circuit board is high. It may not be possible to dissipate heat.

Therefore, the present invention can efficiently dissipate the heat generated in the circuit board on which the image sensor and the heat generating element are mounted, and can make it difficult for the heat generated on the circuit board side to be transferred to the image sensor. The purpose is to provide.

To achieve the above object, an imaging apparatus of the present invention, a shooting image element, and a fan is disposed on one side of the width direction of the apparatus main body, an intake port for sucking outside air by driving the fan , The exhaust port is arranged on the same side surface as the intake port, the air flow of air sucked from the intake port is generated by the drive of the fan, and the air flow is discharged, and the intake port provided inside the apparatus main body. an intake portion of the duct structure to mouth and communicates the duct for closed exhaust portion of the duct structure for the exhaust port and communicating, a cooling portion of the duct structure located between the inlet portion and the exhaust portion, said imaging A heat connecting portion provided between the element and the intake unit and transmitting the heat generated by the imaging element to the intake portion is provided, and the intake portion and the exhaust portion are integrated with the cooling portion. At the same time, the air intake unit extends in a direction intersecting the cooling unit, and the air intake unit sends air sucked from the intake port to the cooling unit by driving the fan, and the cooling unit delivers the air sucked from the intake port to the cooling unit. Heat is exchanged with the air sent from the cooling unit, and the exhaust unit discharges the air warmed by heat exchange in the cooling unit from the exhaust port, and the intake port of the cooling unit and the side where the exhaust port opens. A first circuit board on which a heat generating element is mounted is arranged on the surface of the cooling unit, and a second circuit board on which the heat generating element is mounted is mounted on the surface of the cooling unit opposite to the surface on which the first circuit board is arranged. characterized Tei Rukoto is arranged the circuit board.

According to the present invention, the heat generated in the circuit board on which the image sensor and the heat generating element are mounted can be efficiently dissipated, and the heat generated on the circuit board side can be made difficult to be transmitted to the image sensor.

It is external perspective view of the digital video camera which is an example of embodiment of the image pickup apparatus of this invention. It is an exploded perspective view of the digital video camera shown in FIG. (A) is a view of the camera body viewed from the front side, and (b) is a side view of the right side when viewed from the front side of the camera body. (A) is a side view on the left side when viewed from the front side of the camera body, and (b) is a view from the top surface side of the camera body when the left side surface portion when viewed from the front side of the camera body is in contact with the wall. .. It is a perspective view which shows the state which removed the intake cover and the exhaust cover from the intake port and the exhaust port of a camera body, respectively. It is an exploded perspective view of a camera body. It is a perspective view seen from the back side of the front cover unit. (A) is a perspective view seen from the back surface side of the right cover unit, and (b) is a perspective view of the back cover unit. (A) is a perspective view of the left cover unit as viewed from the front surface side, and (b) is a perspective view of the left cover unit shown in (a) as viewed from the back surface side. (A) is a perspective view seen from the back side of the card board unit, and (b) is a perspective view seen from the bottom side of the card board unit. (A) is a perspective view seen from the back side of the camera body of the main unit, and (b) is a perspective view seen from the front side of the camera body of the main unit. (A) is a perspective view seen from the mounting surface side of the main board to the fan duct unit, and (b) is a perspective view seen from the back surface side of the main board shown in (a). (A) is a perspective view seen from the mounting surface side of the sub-board to the fan duct unit, and (b) is a perspective view seen from the back surface side of the sub-board shown in (a). (A) is a perspective view of a network board, and (b) is a perspective view of a video compression circuit board. It is a perspective view of a power supply board. (A) is a perspective view seen from the back side of the camera body of the fan duct unit, and (b) is a perspective view seen from the front side of the camera body of the fan duct unit. (A) is a side view of the fan duct unit seen from the direction of arrow D in FIG. 16 (b), and (b) is a top view of the fan duct unit shown in (a). (A) is a perspective view of the fan, and (b) is a perspective view of the fan shown in (a) as viewed from the rear side. It is a perspective view of a fan rubber. (A) is a perspective view of the fan incorporated in the fan rubber as seen from the suction side of the fan, and (b) is a perspective view of the state of the fan incorporated in the fan rubber as viewed from the discharge side of the fan. (A) is a perspective view of the right duct seen from the back side of the camera body, and (b) is a view of the right duct shown in (a) seen from the direction of arrow E. It is a front view of the right duct. (A) is a perspective view of the left duct, and (b) is a view of the left duct shown in (a) as viewed from the direction of arrow F. (A) is a perspective view of the left duct rear, and (b) is a perspective view of the left duct rear shown in (a) as viewed from the direction of arrow G. It is an exploded perspective view of a fan duct unit. FIG. 17A is a cross-sectional view taken along the line AA of FIG. 17A. FIG. 17A is a cross-sectional view taken along the line BB of FIG. 17A. (A) is a right side view showing a state in which the main unit is incorporated in the front cover unit, and (b) is an enlarged view of the H portion of FIG. 28 (a). It is a top view which shows the state which the main unit was incorporated in the front cover unit.

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

FIG. 1 is an external perspective view of a digital video camera which is an example of an embodiment of the imaging device of the present invention. FIG. 2 is an exploded perspective view of the digital video camera shown in FIG.

In the digital video camera of the present embodiment, as shown in FIGS. 1 and 2, an interchangeable lens barrel 101 is detachably provided on the front side (subject side) of the camera body 100, and a bottom surface portion of the camera body is provided. Is provided with a detachable shoulder unit 103. Further, a handle portion 102 and a viewfinder portion 104 are detachably provided on the upper surface portion of the camera body 100, respectively. The viewfinder portion 104 is arranged on the front side of the handle portion 102 and above the lens barrel 101. The lens barrel 101 and the viewfinder section 104 are electrically connected to the camera body 100 via a contact portion while being attached to the camera body 100, respectively. The camera body 100 corresponds to an example of the device body of the present invention.

FIG. 3A is a front view of the camera body 100, and FIG. 3B is a side view of the right side of the camera body 100 when viewed from the front side. FIG. 4A is a side view on the left side when viewed from the front side of the camera body 100, and FIG. 4B is a state in which the side surface portion on the left side when viewed from the front side of the camera body 100 is in contact with the wall 215. It is a figure seen from the upper surface side.

As shown in FIG. 3A, the camera body 100 is provided with an image pickup button 201, an image sensor 200, and the like. The image sensor 200 is composed of a CMOS sensor, a CCD sensor, or the like, and photoelectrically converts a subject image formed by passing through the photographing optical system of the lens barrel 101 and outputs the image to an image processing unit (not shown). As shown in FIG. 3B, a power button 202, an operation button group 203, an operation dial 204, and a display unit 205 are provided on the side surface portion on the right side when viewed from the front side of the camera body 100.

Further, as shown in FIG. 4A, a card lid 210 and an external input / output terminal portion are provided on the left side surface portion which is one side surface portion in the width direction of the camera body 100 when viewed from the front side of the camera body 100. A 220, a shooting button 206, an intake port 230, and an exhaust port 240 are provided. The card lid 210 covers the opening of a card slot (not shown) so as to be openable and closable. Further, the intake port 230 is arranged on the front side (right side in the drawing) of the camera body 100, and the exhaust port 240 is arranged on the back side of the camera body 100. Then, the camera body 100 sucks in external air from the intake port 230 by driving the fan 300, which will be described later, and discharges the airflow generated by driving the fan 300 from the exhaust port 240.

In the digital video camera of the present embodiment, the photographer puts the shoulder unit portion 103 on the right shoulder and shoots. Therefore, the photographer's face is adjacent to the right side when viewed from the front side of the camera body 100, but since the exhaust port 240 is on the left side when viewed from the front side of the camera body 100, the exhaust port 240 The exhaust air from the camera does not hit the photographer's face and does not cause discomfort.

Further, as shown in FIG. 4B, since the card lid 210 and the external input / output terminal 220 project to the outside of the camera body 100 with respect to the intake port 230 and the exhaust port 240, the intake port 215 is formed by the wall 215. It does not block 230 or the exhaust port 240. Therefore, the air flow of the intake and exhaust shown by the arrow in FIG. 4B is not obstructed, heat can be dissipated efficiently, and the camera body 100 can be sufficiently cooled.

FIG. 5 is a perspective view showing a state in which the intake cover 231 and the exhaust cover 241 are removed from the intake port 230 and the exhaust port 240 of the camera body 100, respectively. As shown in FIG. 5, the intake cover 231 and the exhaust cover 241 are fixed to the camera body 100 by screws 234, respectively.

An intake filter 232 is incorporated inside the intake cover 231. The intake filter 232 is made of urethane foam having a completely open cell structure, and can prevent dust and the like sucked together with air from entering the inside during intake. The intake filter 232 is a relatively thick filter, and can obtain a high dust collection rate with respect to the air taken in from the intake cover 231.

Further, an exhaust filter 242 made of the same material as the intake filter 232 is incorporated inside the exhaust cover 241 to prevent dust and the like from entering from the exhaust cover 241 like the intake port 230. be able to.

FIG. 6 is an exploded perspective view of the camera body 100. As shown in FIG. 6, the camera body 100 has an exterior formed by a front cover unit 251, a right cover unit 252, a left cover unit 253, a back cover unit 254, a top cover unit 255, and a bottom cover unit 256. The main unit 250 is covered by these cover units 251 to 256. The top cover unit 255 and the bottom cover unit 256 are provided with a plurality of screw holes 257, and external devices, accessories, and the like can be attached to the camera body 100.

FIG. 7 is a perspective view of the front cover unit 251 as viewed from the back surface side. As shown in FIG. 7, the front cover unit 251 is provided with a mount portion 208 (see FIG. 3A) for fixing the sensor substrate 258 on which the image sensor 200 is mounted and the lens barrel 101. ..

As described above, since the image pickup device 200 is composed of a CMOS sensor and a CCD sensor, there is a problem that noise and the like increase due to the heat generated by the element itself, and the image quality deteriorates. Further, since the circuit on the sensor substrate 258 also generates heat and supplies heat to the image sensor 200, it is necessary to dissipate the heat around the image sensor 200 and the sensor substrate 258. Therefore, the sensor heat radiating plate 259 is fixed to the sensor board 258 with screws or the like to dissipate heat.

However, heat dissipation is often insufficient only with the sensor heat dissipation plate 259 fixed to the sensor substrate 258 with screws or the like, and it is necessary to dissipate heat to other structural members. Further, if the sensor heat radiating plate 259 is brought into contact with other parts and fixed with screws or the like, the sensor board 258 may shift when the camera body 100 falls, so that an external force due to the drop is applied to the sensor board 258. It is necessary to dissipate heat in a way that does not transmit.

Therefore, in the present embodiment, by attaching the elastic heat radiating member 701 having conductivity to the back surface of the sensor heat radiating plate 259, the image sensor 200 is not fixed to other parts of the sensor heat radiating plate 259 by a screw or the like. And the heat around the sensor board 258 is dissipated.

The elastic elastic heat radiating member 701 having conductivity includes an elastic member and a metal sheet attached to the elastic member via a double-sided sheet so as to sandwich the elastic member inside. The metal sheet is formed by bending a sheet to which a metal foil such as a copper foil having a thickness of about 0.05 to 0.5 mm is attached so that the metal foil surface faces outward. The elastic elastic heat radiating member 701 having conductivity is attached to the back surface of the sensor heat radiating plate 259 using the exposed portion of the double-sided sheet.

The metal foil of the metal sheet is a metal having high thermal conductivity and low conductive resistance such as copper foil and aluminum foil. The elastic member is made of urethane foam, sponge, or the like. The elastic elastic heat radiating member 701 having conductivity is fixed to the sensor heat radiating plate 259 via double-sided tape and is in contact with the metal foil. The elastic elastic heat radiating member 701 having conductivity is capable of conducting conductivity and radiating heat by contacting the back surface of the sensor heat radiating plate 259 with a metal foil and urging the elastic member in a compressed state sandwiched between metal sheets. Become.

Although the details will be described later, the heat of the sensor heat radiating plate 259 is radiated to the fan duct unit 301 by using the elastic heat radiating member 701 having conductivity, so that the image sensor 200 and the image sensor 200 and the image sensor 200 and the image sensor 200 and the like can be used without fixing with screws or the like. It is possible to dissipate heat around the sensor substrate 258. Here, the sensor heat radiating plate 259 and the conductive elastic heat radiating member 701 correspond to an example of the thermal connection portion of the present invention.

FIG. 8A is a perspective view of the right cover unit 252 as viewed from the back surface side, and FIG. 8B is a perspective view of the back cover unit 254. As shown in FIG. 8A, the right cover unit 252 is provided with a display control board 260. On the display control board 260, shooting settings and images being shot are displayed on the display unit 205, and the camera body 100 is set according to the input contents of switches such as the power button 202, the operation button group 203, and the operation dial 204. A control IC (not shown) for control is mounted. The display control board 260 is electrically connected to the main board 400 (see FIG. 11A) included in the main unit 250, which will be described later.

Further, as shown in FIG. 8B, the back cover unit 254 is provided with a battery terminal 225, and the camera body 100 can be operated by supplying power from a battery (not shown).

9 (a) is a perspective view of the left cover unit 253 as viewed from the front surface side, and FIG. 9 (b) is a perspective view of the left cover unit 253 shown in FIG. 9 (a) as viewed from the back surface side.

As shown in FIG. 9A, the left cover unit 253 is provided with an audio output terminal 221 and an audio input terminal 222 as external input / output terminal portions 220. The audio output terminal 221 and the audio input terminal 222 are connected to a signal control board 262 and a sub board 401, which will be described later, included in the main unit 250, respectively. When a cable or the like is connected to the audio output terminal 221 or the audio input terminal 222, the cable or the like can be pulled out diagonally to the back side of the camera body 100 so that the cable or the like does not get in the way during shooting. There is.

Further, the left cover unit 253 is provided with a card lid 210 that removably covers the opening of a card slot (not shown) of the card board unit 261 described later, to which a recording medium for recording video is detachably mounted. ing.

As shown in FIG. 9B, the left cover unit 253 is provided with a signal control board 262, a card board unit 261 and the like. The signal control board 262 and the card board unit 261 are connected to the main board 400 and the sub board 401, which will be described later, by wire harnesses or the like, and communicate video and audio signals.

FIG. 10A is a perspective view seen from the back side of the card substrate unit 261, and FIG. 10B is a perspective view seen from the bottom surface side of the card substrate unit 261.

As shown in FIG. 10A, the card substrate unit 261 is electrically connected to the video compression circuit board 403 described later. Further, the card board unit 261 includes two card boards 263a and 263b for recording video on a recording medium, and a storage card board 264-3 for storing a setting storage file such as when the camera body 100 is photographed. Two boards are provided.

When recording high-resolution, high-frame-rate video, the IC in the recording medium generates heat, so it is necessary to cool the recording medium. For this reason, heat dissipation rubber (not shown) is provided on the card substrates 263a and 263b to dissipate heat to the heat dissipation plate 268. Further, the three substrates 263a, 263b, 264 and the heat radiating plate 268 are fixed to the metal card substrate base 265 in a state of being positioned by screws or the like.

Further, as shown in FIG. 10B, the card substrate base 265 is provided with a card cooling fan 266, and heat is dissipated by applying the exhaust air of the card cooling fan 266 to the card substrate base 265 and the heat radiating plate 268. It is carried out. Further, a card heat radiating rubber 267 that dissipates heat to the bottom cover unit 256 is attached to the heat radiating plate 268.

FIG. 11A is a perspective view seen from the back side of the camera body 100 of the main unit 250, and FIG. 11B is a perspective view seen from the front side of the camera body 100 of the main unit 250.

As shown in FIG. 11, the main unit 250 includes a fan duct unit 301, a main board 400, a sub board 401, a network board 402, a video compression circuit board 403, a power supply board 404, a main board heat radiating board 410, and a sub board radiating board 411. Has. The main board heat radiating plate 410 and the sub board heat radiating plate 411 are made of sheet metal members such as copper and aluminum having excellent thermal conductivity, and dissipate heat from the heat generating parts mounted on the main board 400 and the sub board 401, respectively. There is.

In the camera body 100, the power consumption is larger in the order of the main board 400, the sub board 401, the video compression circuit board 403, and the power supply board 404. By fixing the plurality of substrates 400 to 404 that generate heat to the fan duct unit 301 and transferring heat, it is possible to cool the plurality of substrates 400 to 404 at once. Since high-speed communication is required between the main board 400, the sub board 401, the network board 402, and the video compression circuit board 403, a thin coaxial wire or the like is used for the connection between the respective boards.

Next, the main board 400, the sub board 401, the network board 402, the video compression circuit board 403, and the power supply board 404 will be described with reference to FIGS. 12 to 15.

FIG. 12A is a perspective view of the main board 400 viewed from the mounting surface side of the fan duct unit 301, and FIG. 12B is a perspective view of the main board 400 shown in FIG. 12A as viewed from the back surface side. is there.

As shown in FIG. 12, since the main board 400 is electrically connected to all electronic devices, many ICs are mounted on the main board 400, which is the board having the largest area in the camera body 100. On the side shown in FIG. 12A of the main board 400, a front-end IC 600 that processes signals from the sensor board 258, a video processing IC 602 that performs processing such as color adjustment for video, and these ICs 600 and 602 are used. The memory 603 and the like are implemented. Since the front end IC 600, the image processing IC 602, and the memory 603 consume a large amount of power and generate a large amount of heat, they are mounted on the fan duct unit 301 side, and the heat generated by using the heat dissipation rubber (not shown) is used as a fan. Heat is transferred to the duct unit 301.

Further, on the side of the main board 400 shown in FIG. 12B, a circuit component 604 for supplying power to the front-end IC 600 and the video processing IC 602 is mounted. The heat generated in the circuit component 604 is transferred to the main board heat radiating plate 410 (see FIG. 11A)) and radiated.

13 (a) is a perspective view of the sub-board 401 as viewed from the mounting surface side of the fan duct unit 301, and FIG. 13 (b) is a perspective view of the sub-board 401 as shown in FIG. 13 (a) as viewed from the back surface side. is there.

On the side shown in FIG. 13A of the sub-board 401, a back-end IC 611 or a format conversion IC 612 that receives video data from the video processing IC 602 of the main board 400 and converts the optimum video format for each external input / output. Etc. are implemented. The back-end IC 611 and the format conversion IC 612 are also mounted on the fan duct unit 301 side of the sub-board 401, and the heat generated in each IC 611 and 612 is transferred to the fan duct unit 301 by using heat dissipation rubber (not shown). ..

A circuit component 613 for supplying power to the back-end IC 611 and the format conversion IC 612 is mounted on the side shown in FIG. 13 (b) of the sub-board 401, and the heat of the circuit component 613 is transferred to the sub-board heat dissipation plate 411. (See FIG. 11B), heat is transferred and dissipated.

FIG. 14A is a perspective view of the network board 402, and FIG. 14B is a perspective view of the video compression circuit board 403.

As shown in FIG. 14A, a communication IC 621 that controls wireless communication such as WIFI is mounted on the network board 402, and the video captured in the camera body 100 can be transmitted to an external device. .. Further, as shown in FIG. 14B, the video compression circuit board 403 receives video data from the video processing IC 602 of the main board 400 and writes the video to the recording medium at a high resolution and a high frame rate. A compressed IC 631 is mounted.

FIG. 15 is a perspective view of the power supply board 404. As shown in FIG. 15, the power supply board 404 supplies power to the main board 400, the sub board 401, the network board 402, the video compression circuit board 403, and the electric device in the camera body 100. Since the power consumption of the entire camera body 100 is large, components such as a relatively large capacitor 641 and a coil 642 are mounted on the power supply board 404. The power supply board 404 is connected to the main board 400 by a BtoB connector 643, and uses many of the pins of the BtoB connector 643 to supply power to a large number of electric devices.

FIG. 16A is a perspective view of the fan duct unit 301 as viewed from the back side of the camera body 100, and FIG. 16B is a perspective view of the fan duct unit 301 as viewed from the front side of the camera body 100. 17 (a) is a side view of the fan duct unit 301 seen from the direction of arrow D in FIG. 16 (b), and FIG. 17 (b) is a top view of the fan duct unit 301 shown in FIG. 17 (a).

As shown in FIG. 16, the right duct 302, the left duct 303, and the left duct rear 304 are fixed to the fan duct unit 301 by screws 305. Inside the fan duct unit 301, as shown in FIGS. 16B and 17A, two fans 300, which are small axial-flow fans incorporated in the fan rubber 306, are arranged side by side in the vertical direction of the drawing. It is provided. By adopting a small axial fan as the fan 300, the fan duct unit 301 can be made smaller, and the camera body 100 is made smaller. Further, by incorporating the fan 300 into the fan rubber 306, vibration generated when the fan 300 rotates is reduced.

In FIG. 17B, the fan duct unit 301 can be roughly divided into an intake unit 325, a cooling unit 326, and an exhaust unit 327, which are shown by broken lines, respectively. The intake unit 325 communicates with the intake port 230 provided in the left cover unit 253 of the camera body 100, and sends air from the outside of the camera body 100 to the cooling unit 326.

In the cooling unit 326, heat exchange with air is performed by the right duct fin 331 and the left duct fin 341 for cooling, which will be described later. Thereby, by cooling the fan duct unit 301, the IC mounted on the main board 400, the sub board 401, and the like can be cooled. The exhaust unit 327 communicates with the exhaust port 240 provided in the left cover unit 253 of the camera body 100, and discharges the air warmed by heat exchange.

Here, the cooling unit 326 extends in the optical axis direction along the outer inner surface of the right cover unit 252 forming the other side surface portion in the width direction of the camera body 100 when viewed from the front side of the camera body 100. .. Further, the intake unit 325 is connected so as to intersect the front end of the camera body 100 of the cooling unit 326 at a substantially right angle, and the exhaust unit 327 is connected to the rear end of the camera body 100 of the cooling unit 326. It is connected at an obtuse angle. Therefore, the fan duct unit 301 has a substantially U-shape.

Further, in FIG. 17B, Wd indicates the width dimension of the right duct 302 and the left duct 303 combined, and Wf indicates the width dimension of the fan 300. In the fan duct unit 301 of the present embodiment, the relationship of Wd <Wf is possible by arranging the fan 300 in the vicinity of the connection portion between the cooling unit 326 and the exhaust unit 327. As a result, the fan duct unit 301 can be made thinner, and the camera body 100 can be made thinner.

Further, by making the fan duct unit 301 substantially U-shaped, the main substrate 400 having a relatively large area can be arranged on the outside of the cooling unit 326 (upper side of FIG. 17B), and the cooling unit 326 can be arranged. A sub-board 401 having a relatively small area can be arranged inside the circuit board. Further, the right duct fin 331 (see FIG. 21B) of the right duct 302 outside the cooling unit 326 can be lengthened in the direction in which the wind flows, and the main substrate 400 can be effectively cooled. ..

Further, by making the fan duct unit 301 substantially U-shaped, the card board unit 261 can be arranged in the space 307 inside the fan duct unit 301 (lower side of FIG. 17B), and the camera body 100 can be arranged. Can be miniaturized.

Further, as shown in FIG. 17B, by making the fan duct unit 301 substantially U-shaped, it is possible to arrange the intake port 230 and the exhaust port 240 in the left cover unit 253. The right duct 302, the left duct 303, and the left duct rear 304 are made of a metal material such as aluminum or magnesium, and the fan rubber 306 is made of an elastic material such as silicon.

Next, the fan 300 will be described with reference to FIG. FIG. 18A is a perspective view of the fan 300, and FIG. 18B is a perspective view of the fan 300 shown in FIG. 18A as viewed from the rear side.

As shown in FIG. 18, the fan 300 has an exterior formed by a resin frame 310, and has a fan wire 312 for electrically connecting to the main substrate 400 and a fan substrate (not shown). A motor (not shown) electrically connected via a fan substrate is held inside the fan 300, and a pressure difference is generated by rotating the blades 313 by the motor to send air. Further, as a means for detecting the rotation of the blade 313, the blade 313 is provided with a magnet (not shown), and the fan substrate is provided with a Hall element (not shown). The blade 313 detects the rotation speed of the blade 313. Is provided with means for feedback control so that the number of rotations reaches a predetermined value.

As a result, the fan 300 has a function of sucking air from the suction side and discharging it from the discharge side, and can control the rotation speed. Generally, an axial fan can obtain a sufficiently large air volume by rotating the blades 313 at a low speed. By rotating the blade 313 at a low speed, noise such as wind noise and motor noise can be suppressed, which is most suitable for a digital video camera.

Next, the fan rubber 306 will be described with reference to FIGS. 19 and 20. FIG. 19 is a perspective view of the fan rubber 306. As shown in FIG. 19, the fan rubber 306 is provided with an outer rib 321 formed of a rubber member such as silicon rubber, an inner rib 322, and a notch 323. The inner ribs 322 are provided at the four inner corners of the fan rubber 306.

FIG. 20 (a) is a perspective view of the fan 300 incorporated in the fan rubber 306 as viewed from the suction side of the fan 300, and FIG. 20 (b) shows the state in which the fan 300 is incorporated in the fan rubber 306 on the discharge side of the fan 300. It is a perspective view seen from.

As shown in FIG. 20, the fan rubber 306 is sandwiched between the inner ribs 322 so as not to cover the openings on the suction side and the discharge side of the fan 300 to hold the fan 300. At this time, as shown in FIG. 20B, by pulling out the fan wire 312 of the fan 300 from the notch portion 323, the outer shape of the fan 300 and the inner diameter of the fan rubber 306 can be assembled without a gap. Can be done.

Next, the right duct 302 will be described with reference to FIGS. 21 and 22. 21 (a) is a perspective view of the right duct 302 viewed from the back side of the camera body 100, and FIG. 21 (b) is a view of the right duct 302 shown in FIG. 21 (a) as viewed from the direction of arrow E. FIG. 22 is a front view of the right duct 302.

As shown in FIG. 21A, the right duct 302 has a main board 400, a main board fixing portion 332 for fixing the power supply board 404 with screws or the like, and a power supply board fixing portion 333. Further, the right duct 302 is provided with a right duct convex portion 334 at a position corresponding to the front end IC 600, the image processing IC 602, and the memory 603 mounted on the main board 400, respectively. The size of the right duct convex portion 334 is substantially the same as that of the heat radiating rubber (not shown) attached to the right duct convex portion 334. As a result, the heat generated by the front end IC 600, the image processing IC 602, and the memory 603 can be transmitted to the right duct convex portion 334 via the heat radiating rubber.

As shown in FIG. 21B, inside the right duct 302, a fan rubber 306 incorporating a right duct fin 331 and a fan 300 is held between the right duct upper wall 336 and the right duct lower wall 337. A fan rubber holding rib 335 is provided. A plurality of right duct fins 331 are arranged side by side at predetermined intervals in the height direction of the camera body 100 in order to expand the heat dissipation area. Further, right duct ribs 338 are provided at both left and right ends of the right duct fins 331 of the right duct upper wall 336 and the right duct lower wall 337, respectively.

As shown in FIG. 22, the right duct 302 is provided with a convex portion 702 at a position corresponding to the above-mentioned conductive elastic heat radiating member 701 attached to the sensor heat radiating plate 259. The size of the convex portion 702 is substantially the same as that of the elastic heat radiating member 701 having conductivity. As a result, the heat generated by the image sensor 200 and the sensor substrate 258 can be transferred from the convex portion 702 to the right duct 302 and the intake portion 325 of the fan duct unit 301 via the elastic heat radiating member 701 having conductivity. ..

Next, the left duct 303 will be described with reference to FIG. 23. 23 (a) is a perspective view of the left duct 303, and FIG. 23 (b) is a view of the left duct 303 shown in FIG. 23 (a) as viewed from the direction of arrow F.

As shown in FIG. 23A, the left duct 303 is provided with a sub-board fixing portion 342 for fixing the sub-board 401 and the sub-board heat radiating plate 411 with screws or the like. Further, the left duct 303 is provided with a left duct convex portion 344 at a position corresponding to the back-end IC 611 mounted on the sub-board 401, the format conversion IC 612, and the like. The size of the left duct convex portion 344 is substantially the same as the heat radiating rubber attached to the left duct convex portion 344. This makes it possible to transmit the heat generated by the back-end IC 611 and the format conversion IC 612 to the left duct convex portion 344 via the heat radiating rubber. Further, the left duct 303 is provided with a left duct fixing portion 347 for fixing the left duct rear 304.

As shown in FIG. 23B, a plurality of left duct fins 341 arranged side by side at predetermined intervals in the height direction of the camera body 100 are provided inside the left duct 303 in order to expand the heat dissipation area. Further, a separation wall 343 is provided at a substantially central portion inside the left duct 303. The separation wall 343 separates the internal space into two upper and lower parts when the right duct 302 and the left duct 303 are combined. By incorporating the right duct upper wall 336 of the right duct 302 and the right duct lower wall 337 into the left duct upper wall 345 and the left duct lower wall 346 of the left duct 303, the gap of the fan duct unit 301 can be eliminated, and dust and the like can be removed. It is possible to prevent the intrusion of rainwater.

Next, the left duct rear 304 will be described with reference to FIG. 24. FIG. 24A is a perspective view of the left duct rear 304, and FIG. 24B is a perspective view of the left duct rear 304 shown in FIG. 24A as viewed from the direction of arrow G.

As shown in FIG. 24A, the left duct rear 304 is provided with a substrate fixing portion 353 for fixing the video compression circuit board 403 with screws or the like. Further, the left duct rear 304 is provided with a heat dissipation flat portion 355 at a position corresponding to the video compression IC 631 mounted on the video compression circuit board 403. The heat generated by the video compression IC 631 can be transmitted to the heat radiating flat surface portion 355 via a heat radiating rubber (not shown).

As shown in FIG. 24B, inside the left duct rear 304, a plurality of left duct rear fins 351 for expanding the heat dissipation area and two fan incorporating portions for holding the fan rubber 306 incorporating the fan 300 are held. 352 is provided. Further, a separation wall 354 is provided at a substantially central portion inside the left duct rear 304. The separation wall 354 separates the internal space into two when the left duct rear 304 is incorporated into the right duct 302. As a result, the exhaust air from one of the two fans 300 is prevented from being sucked into the other fan 300, and the air heated by the right duct fin 331 and the left duct fin 341 is discharged to the outside of the camera body 100. Can be reliably exhausted.

Next, the fan duct unit 301 will be described with reference to FIG. 25. FIG. 25 is an exploded perspective view of the fan duct unit 301. As shown in FIG. 25, the fan rubber 306 is incorporated in the fan incorporating portion 352 of the left duct rear 304 in a state where the outer rib 321 is in contact with the fan incorporating portion 352, whereby the fan 300 is held. By doing so, the vibration generated by the rotation of the blade 313 of the fan 300 does not affect the camera body 100. Further, since the outer rib 321 is also in contact with the right duct 302, it also has an effect of preventing backflow of air in the fan duct unit 301.

FIG. 26 is a cross-sectional view taken along the line AA of FIG. 17A. 27 is a cross-sectional view taken along the line BB of FIG. 17A. 27 is a cross-sectional view of the right duct 302 shown in FIG. 21B at the position of the right duct rib 338.

As shown in FIG. 26, in the fan duct unit 301, the left duct fin 341 of the left duct 303 is placed between the right duct fins 331 adjacent to each other in the height direction (vertical direction in the figure) of the camera body 100 of the right duct 302. It has been inserted. That is, a plurality of right duct fins 331 and a plurality of left duct fins 341 are alternately arranged in the height direction of the camera body 100. As a result, the air sucked by the fan 300 can cool the right duct 302 and the left duct 303 by passing through the gap between the right duct fin 331 and the left duct fin 341.

A duct upper space 361 is formed between the right duct upper wall 336 of the right duct 302 and the uppermost left duct fin 341 of the left duct 303. Further, a duct lower space 362 is formed between the right duct lower wall 337 of the right duct 302 and the lowermost left duct fin 341 of the left duct 303. Both the duct upper space 361 and the duct lower space 362 are wider than the space between the right duct fin 331 and the left duct fin 341.

Here, in the present embodiment, as shown in FIG. 27, the volume of the duct upper space 361 and the duct lower space 362 is partially reduced by providing the right duct rib 338 described above in the right duct 302. As a result, the air flowing through the duct upper space 361 and the duct lower space 362 is made difficult to flow, the flow velocity of the air in the central portion of the fan duct unit 301 is increased, and the heat dissipation effect by the fins 331 and 341 is enhanced.

Next, the heat dissipation structure around the image sensor 200 and the sensor substrate 258 will be described with reference to FIGS. 28 and 29.

FIG. 28 (a) is a right side view showing a state in which the main unit 250 is incorporated in the front cover unit 251 and FIG. 28 (b) is an enlarged view of the H portion of FIG. 28 (a).

As shown in FIG. 28, the sensor heat radiating plate 259 and the fan duct unit 301 are in contact with each other via the above-mentioned conductive elastic heat radiating member 701. Therefore, the heat around the image sensor 200 and the sensor substrate 258 can be radiated from the sensor heat radiating plate 259 to the fan duct unit 301 via the elastic elastic heat radiating member 701 having conductivity.

FIG. 29 is a top view showing a state in which the main unit 250 is incorporated in the front cover unit 251.

As shown in FIG. 29, the fan duct unit 301 takes in air from the vicinity of the left side surface of the sensor heat radiating plate 259 by the fan 300 as shown by the arrow in the figure, and transfers the heat to the camera body 100. Send to the back side of. Therefore, the heat transferred from the sensor heat radiating plate 259 to the fan duct unit 301 via the elastic heat radiating member 701 having conductivity is most efficiently cooled by the cold air just taken in from the intake port 230.

Further, the main board 400, the sub board 401, the video compression circuit board 403, and the power supply board 404, which are the main heat sources other than the sensor heat radiating plate 259 described above, are mounted on the camera body 100 from the sensor heat radiating board 259. It is located on the back side. The heat generated by the main board 400, the sub-board 401, the video compression circuit board 403, and the power supply board 404 arranged on the back side of the camera body 100 is further arranged on the back side of the camera body 100 than these boards. It is exhausted from the exhaust port 240 through the exhaust unit 327. Therefore, the heat generated in the main board 400, the sub board 401, the video compression circuit board 403, and the power supply board 404 is not transferred to the sensor heat radiating board 259.

As described above, in the present embodiment, the heat generated by the image sensor 200 and the circuit boards 400, 401, 403, 404 can be efficiently dissipated, and the heat generated by the circuit boards 400, 401, 403, 404 can be efficiently dissipated. It is possible to make it difficult for heat to be transferred to the image sensor 200.

The configuration of the present invention is not limited to that illustrated in the above embodiment, and the material, shape, dimensions, form, number, arrangement location, etc. can be appropriately changed as long as the gist of the present invention is not deviated. Is.

100 Camera body 200 Image sensor 230 Intake port 240 Exhaust port 258 Sensor board 259 Sensor heat dissipation board 300 Fan 301 Fan duct unit 325 Intake part 326 Cooling part 327 Exhaust part 400 Main board 401 Sub board 403 Video compression circuit board 404 Power supply board 701 Elasticity Heat dissipation member

Claims (9)

And an imaging element,
And a fan,
An intake port that is arranged on one side of the device body in the width direction and that sucks in external air by driving the fan,
An exhaust port that is arranged on the same side surface as the intake port, generates an air flow of air sucked from the intake port by driving the fan, and discharges the air flow.
An intake portion having a duct structure that is provided inside the main body of the apparatus and communicates with the intake port, an exhaust portion having a duct structure that communicates with the exhaust port, and a duct structure located between the intake portion and the exhaust portion. a duct for chromatic and cooling unit,
It is provided between the image pickup element and the intake unit, and includes a heat connection portion that transfers heat generated by the image pickup element to the intake unit.
The intake unit and the exhaust unit are integrated with the cooling unit and extend in directions intersecting with the cooling unit.
The intake unit sends out the air sucked from the intake port by driving the fan to the cooling unit.
The cooling unit exchanges heat with the air sent from the intake unit, and the exhaust unit discharges the air warmed by heat exchange in the cooling unit from the exhaust port.
A first circuit board on which a heat generating element is mounted is arranged on the surfaces of the cooling unit on the side where the intake port and the exhaust port are opened, and the surface of the cooling unit on which the first circuit board is arranged. opposite to the surface is disposed a second circuit board that heating elements are mounted imaging apparatus according to claim Tei Rukoto. The imaging device according to claim 1, wherein the area of the second circuit board is larger than the area of the first circuit board. The imaging device according to claim 1 or 2, wherein the power consumption of the second circuit board is larger than the power consumption of the first circuit board. The imaging device according to any one of claims 1 to 3, wherein a video processing IC that performs predetermined processing on a video signal is mounted on the second circuit board. The imaging device according to any one of claims 1 to 4, wherein the intake unit extends in a direction that intersects the cooling unit at a substantially right angle. The imaging device according to any one of claims 1 to 5, wherein the exhaust unit extends in a direction that intersects the cooling unit at an obtuse angle. The imaging device according to any one of claims 1 to 6, wherein a fan is provided at a connection portion between the exhaust portion and the cooling portion of the duct. Any one of claims 1 to 7, wherein the intake port is arranged on the front side of the device main body, which is the subject side, and the exhaust port is arranged on the back side of the device main body. The imaging device according to. The heat connection portion is arranged between a heat radiating plate fixed to a sensor substrate on which the image pickup device is mounted, and the heat radiating plate and the intake portion, and is compressed by the heat radiating plate and the intake portion, respectively. The image pickup apparatus according to any one of claims 1 to 8, further comprising an elastic heat radiating member having conductivity in contact with the above.