JP2020057889A - Imaging apparatus, control method thereof, and control program - Google Patents

Abstract

To provide an imaging apparatus, a control method, and a control program for the imaging apparatus, which do not exceed a guaranteed temperature of a component mounted on a substrate in the imaging apparatus.SOLUTION: In an imaging apparatus including at least one or more substrates on which a plurality of temperature detection units are mounted, and a plurality of cooling fans located in a duct, and having a structure that cools a substrate that is thermally connected to the duct by using air flows of the plurality of cooling fans, a first temperature detection unit is arranged in a portion connected to the duct between an intake port and the plurality of cooling fans, a second temperature detection unit is arranged in a portion connected to the duct between the plurality of cooling fans and an exhaust port. Immediately after recording, all of the cooling fans are stopped, the rotation direction of each of the plurality of cooling fans is determined and rotated such that an arbitrary range in which the temperature detection unit that detects that the temperature has exceeded a predetermined temperature is mounted is cooled from among the plurality of temperature detection units, and then the temperatures detected by the plurality of temperature detection units are compared to change the rotation direction.SELECTED DRAWING: Figure 20

Description

  The present invention relates to an imaging device, a control method thereof, and a control program.

  Digital video cameras for business use such as broadcasting are required to be small in size, but are required to have high functionality and high image quality, which leads to an increase in power consumption. Thermal runaway due to exceeding the guaranteed temperature is a problem. For this reason, a device for cooling the inside of an image pickup device with a forced air cooling structure using a cooling fan has been developed. However, if the inside of the imaging device is cooled by the cooling fan, noise of the cooling fan is recorded at the time of recording. Therefore, an imaging device that prevents noise of a cooling fan from mixing during recording has been proposed. After the cooling fan is stopped immediately after the start of recording, control is performed such that the cooling fan is rotated at a high speed when the temperature detected by the predetermined temperature sensor reaches the predetermined temperature (Patent Document 1).

  FIG. 24 is a flowchart for explaining an example of a cooling fan operation control process in the conventional imaging apparatus. The imaging device of the related art can change the operation of the cooling fan between the “normal mode” and the “silence mode”.

  This process starts when the power of the conventional imaging apparatus is turned on, and first, it is determined whether or not the currently set mode of the cooling fan is the mute mode (step S501).

  If it is in the mute mode (YES in step S501), it is determined whether or not the video and audio are currently being recorded (the shooting button has been operated) (step S502). If recording is not being performed in the mute mode (NO in step S502), the cooling fan is rotated (step S505). On the other hand, if the recording is being performed in the mute mode (YES in step S502), it is determined whether the temperature has reached a predetermined temperature or higher based on the temperature detected by the temperature sensor mounted on the board (step S503).

  If the detected temperature is not equal to or higher than the predetermined temperature (NO in step S503), the cooling fan is stopped (step S504). Then, the process returns to step S501. On the other hand, if the detected temperature is equal to or higher than the predetermined temperature (YES in step S503), the process proceeds to step S505 to rotate the cooling fan.

  If the mode is not the silencing mode but the normal mode (NO in step S501), the cooling fan is rotated (step S506), and the process returns to step S501.

JP 2007-4872 A

  However, in Patent Document 1 described above, heat is trapped inside the imaging device when the cooling fan is stopped, and when the cooling fan is rotated, very high temperature air inside the imaging device becomes exhaust air and is exhausted from the imaging device. You. In imaging devices consisting of multiple substrates to support higher functionality and higher image quality, it is necessary to use the airflow on both the intake and exhaust sides of the cooling fan to perform efficient cooling. is there. In such an imaging apparatus, since the high-temperature air hits the substrate arranged on the exhaust side of the cooling fan, the temperature of the substrate may rise and exceed the guaranteed temperature of the mounted components, resulting in malfunction. there were.

  In view of such a problem, the present invention relates to an imaging device that cools a substrate by using an air flow of a cooling fan. An imaging device that has a fan stop mode for stopping the cooling fan after recording starts, and then rotates the cooling fan when the temperature of the substrate rises, so that the guaranteed temperature of the components mounted on the substrate in the imaging device is not exceeded; It is an object to provide a control method and a control program.

In order to achieve the above object, an imaging device according to the present invention includes:
At least one or more substrates on which a plurality of temperature detecting units are mounted, and a cooling fan disposed in a duct, wherein the substrate is thermally connected to the duct, and the substrate is formed by using an airflow of the cooling fan. In the imaging device having a structure for cooling the cooling fan, the first temperature detecting unit is disposed at a portion connected to the duct between the intake port and the cooling fan, and the second temperature detecting unit is disposed between the cooling fan and the exhaust port. The cooling fan is disposed at a portion connected to the duct, and the cooling fan is capable of reversing the rotation direction to forward rotation and reverse rotation, and provided with control means for determining the rotation direction of the cooling fan, Stop, and when it is detected that any one of the plurality of temperature detection units exceeds the predetermined temperature, the temperature detection unit detects the detected temperature and cools an arbitrary range in which the temperature detection unit is mounted. ,Before Rotate to determine the direction of rotation of the cooling fan, then, by comparing the detected temperature of said plurality of temperature sensing portion, characterized by comprising a control means for changing the direction of rotation.

  According to the present invention, an imaging apparatus that cools a substrate by using a flow of air from a cooling fan includes a fan stop mode in which the cooling fan is stopped after recording is started, and then the cooling fan is turned off when the temperature of the substrate increases. It is possible to realize an image pickup apparatus that can be rotated so as not to exceed a guaranteed temperature of a component mounted on a substrate in the image pickup apparatus, a control method thereof, and a control program.

FIG. 1 is a block diagram of a digital video camera that is an example of a first embodiment of the present invention. FIG. 1A is an external perspective view of a digital video camera which is an example of the first embodiment of the present invention, and FIG. 2B 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 right side view of the camera body viewed from the front side. It is a side view on the left side when viewed from the front side of the camera body. FIG. 3 is an exploded perspective view of the camera body. FIG. 3A is a perspective view of the main unit viewed from the back side of the camera body, and FIG. 3B is a perspective view of the main unit viewed from the front side of the camera body. FIG. 9 is a top view of the main unit with a third sub-board removed. FIG. 2A is a perspective view of the main board as viewed from the side where the main board is attached to the fan duct unit, and FIG. 2B is a perspective view of the main board shown in FIG. FIG. 2A is a perspective view of the first sub-board viewed from the side where the first sub-board is attached to the fan duct unit, and FIG. 2B is a perspective view of the first sub-board shown in FIG. FIG. 4 is a perspective view of a second sub-board. It is a perspective view of a power supply board. FIG. 2A is a perspective view of the fan duct unit viewed from the rear side of the camera body, and FIG. 2B is a perspective view of the fan duct unit viewed from the front side of the camera body. 12A is a side view of the fan duct unit as viewed from the direction of arrow D in FIG. 12B, and FIG. 12B is an exploded perspective view of the fan duct unit. (A) is a perspective view of the upper fan, and (b) is a perspective view of the upper fan shown in (a) as viewed from the back side. (A) is a perspective view of the fan rubber, and (b) is a view in which the upper fan is incorporated in the fan rubber. (A) is a perspective view of the right duct viewed from the rear side of the camera body, and (b) is a perspective view of the right duct shown in (a) viewed from the direction of arrow E. (A) is a perspective view of the left duct, and (b) is a perspective 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. FIG. 14 is a sectional view taken along line AA of FIG. 5 is a flowchart illustrating an example of a fan operation control process according to the first embodiment of the present invention. (A) is a diagram for explaining in a time series the case where the rotation direction is not switched in the operation control processing of the fan stop mode in the first embodiment, and (b) is described in a time series where the rotation direction is switched. FIG. It is a flow chart for explaining an example of operation control processing of a fan in a 2nd embodiment of the present invention. (A) is a diagram for explaining in chronological order the case where the rotation direction is not switched in the operation control process of the fan stop mode in the second embodiment, and (b) is described in chronological order when the rotation direction is switched. FIG. 9 is a flowchart for explaining an example of a cooling fan operation control process in a conventional imaging apparatus.

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

(First embodiment)
FIG. 1 is a block diagram of a digital video camera which is an example of an embodiment of the first embodiment of the present invention. The system of the camera body 100 will be described with reference to FIG.

  The camera body 100 includes an imaging unit 200, and the imaging unit 200 includes a CCD or CMOS device and an A / D converter. Then, an optical image is formed on a CCD or CMOS element via a lens barrel 101 described later. The CCD or CMOS element outputs an electric signal (analog signal) corresponding to the optical image, and the A / D converter converts the analog signal into a digital signal and outputs it as image data.

  The sound input unit 160 has a microphone that receives external sound and converts it into an electric signal, and outputs sound data corresponding to the electric signal output from the microphone. The ROM 153 is an electrically erasable / recordable memory, for example, an EEPROM or the like. The ROM 153 stores constants and programs for the operation of the CPU 152. Note that the program includes a program for executing a flowchart described later. The CPU 152 controls the entire camera body 100. Then, the CPU 152 performs a process described later by executing a program recorded in the ROM 153. The RAM 154 is used as a system memory, a work memory, an image memory, and an audio memory. In the RAM 154, constants and variables for operation of the CPU 152, programs read from the ROM 153, and the like are loaded.

  The above-mentioned audio data is temporarily recorded in the RAM 154, for example. The CPU 152 sends the image data and the audio data recorded in the RAM 154 to the recording unit 157, and records the image data and the audio data in the recording unit 157. Note that the recording unit 157 is, for example, a recording medium such as a memory card. The above-described image data is temporarily recorded in the RAM 154, for example. The CPU 152 displays an image corresponding to the image data recorded in the RAM 154 on the display unit 205. Note that a liquid crystal panel or an organic EL is used for the display unit 205.

  The temperature detecting unit 155 is a first temperature detecting unit 615 and a second temperature detecting unit 632 described later, and uses, for example, a thermistor. The operation unit 158 is operated by a user to give various instructions to the CPU 152. Further, the camera body 100 is provided with a cooling fan 300.

  FIG. 2A is an external perspective view of a digital video camera which is an example of the first embodiment of the present invention. FIG. 2B is an exploded perspective view of the digital video camera shown in FIG.

  In the digital video camera according to the present embodiment, as shown in FIGS. 2A and 2B, an interchangeable lens barrel 101 is detachably provided on the front side (subject side) of the camera body 100. On the bottom of the camera body, a shoulder unit 103 is detachably provided. A handle 102 and a viewfinder 104 are detachably provided on the upper surface of the camera body 100. The viewfinder 104 is arranged on the front side of the handle 102 and above the lens barrel 101. The lens barrel 101 and the viewfinder unit 104 are electrically connected to the camera body 100 via contact points while being mounted on the camera body 100, respectively. The camera body 100 corresponds to an example of the apparatus body of the present invention.

  FIG. 3A is a view of the camera body 100 as viewed from the front side, and FIG. 3B is a right side view of the camera body 100 as viewed from the front side. FIG. 4 is a left side view when viewed from the front side of the camera body 100.

  As shown in FIG. 3A, the camera body 100 is provided with a shooting button 201, an imaging unit 200, a mount unit 208 for fixing the lens barrel 101, and the like. A microphone, which is a voice input unit 160 (not shown), is also provided in the front part of the camera body 100. As shown in FIG. 3B, a power button 202, an operation button group 203, an operation dial 204, and a display unit 205, which are operation units 158, are provided on a right side surface when viewed from the front side of the camera body 100. Have been.

  As shown in FIG. 4, a card cover 210, an external input / output terminal 220, and a left side surface, which is one side in the width direction of the camera body 100 when viewed from the front side of the camera body 100, are provided. A button 206, a front vent 230 and a rear vent 240 are provided. The card cover 210 covers an opening of a card slot (not shown) so as to be openable and closable. Further, the front vent 230 is arranged on the front side (the right side in the figure) of the camera body 100, and the rear vent 240 is arranged on the back side (the left side in the figure) of the camera body 100. Then, the inside of the camera body 100 is cooled by the cooling fan 300 described later using the front ventilation port 230 and the rear ventilation port 240.

  FIG. 5 is an exploded perspective view of the camera body 100. As shown in FIG. 5, the camera body 100 forms an exterior by a front cover unit 251, a right cover unit 252, a left cover unit 253, a back cover unit 254, an upper 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, so that external devices, accessories, and the like can be attached to the camera body 100.

  FIG. 6A is a perspective view of the main unit 250 as viewed from the rear side of the camera body 100, and FIG. 6B is a perspective view of the main unit 250 as viewed from the front side of the camera body 100. FIG. 7 is a top view of the main unit 250 with the third sub-board 402 removed. As shown in FIG. 6, the main unit 250 includes a fan duct unit 301, a main board 400, a first sub-board 401, a third sub-board 402, a second sub-board 403, a power supply board 404, and a main board heat sink. 410 and a sub-substrate heat sink 411. The main board radiator plate 410 and the sub-board radiator plate 411 are formed of a sheet metal member having excellent thermal conductivity, such as copper or aluminum, and radiate heat of the heat-generating components mounted on the main board 400 and the first sub-board 401, respectively. It is carried out.

  As shown in FIGS. 6 and 7, a plurality of substrates 400 to 404 are fixed to the fan duct unit 301 in the camera body 100. By using a cooling fan 300 described later incorporated in the fan duct unit 301, the plurality of substrates 400 to 404 can be cooled at one time.

  The cooling fan 300 controls a rotation direction and a rotation speed by a control unit (not shown) mounted on the main board 400. When the cooling fan 300 is rotated, the direction of rotation when the air is sucked into the camera main body 100 from the front ventilation port 230 and exhausted from the rear ventilation port 240 is defined as “forward rotation”. The direction of rotation when air is sucked into the camera body 100 from the rear vent 240 and exhausted from the front vent 230 is defined as “reverse rotation”. When the cooling fan 300 is rotated forward, the cool air that has just been sucked passes through the fan duct unit 301 near the front cover unit 251. Therefore, the imaging unit 200 provided in the front cover unit 251 can be efficiently cooled through the sensor radiator plate (not shown).

  Next, the main board 400, the first sub-board 401, the second sub-board 403, and the power supply board 404 will be described with reference to FIGS.

  FIG. 8A is a perspective view of the main board 400 as seen from the side where the main board 400 is attached to the fan duct unit 301, and FIG. 8B is a perspective view of the main board 400 shown in FIG. is there.

  As shown in FIG. 8, the main board 400 is a board having the largest area in the camera body 100 on which many ICs are mounted because it is electrically connected to all electronic devices. In this embodiment, since the heat generated by the IC 600, the IC 602, and the memory 603 is large, the IC 600, the IC 602, and the memory 603 are mounted on the fan duct unit 301 side, and the heat generated by using a heat radiation rubber (not shown) is transferred to the fan duct unit 301. I have.

  On the side of the main board 400 shown in FIG. 8B, a power supply circuit component 604 for supplying power to each unit is mounted. The heat generated by the power supply circuit component 604 is transferred to the main board radiating plate 410 (see FIG. 6A) and radiated.

  FIG. 9A is a perspective view of the first sub-board 401 as viewed from the side where the first sub-board 401 is attached to the fan duct unit 301, and FIG. 9B is the back side of the first sub-board 401 shown in FIG. 9A. It is the perspective view seen from.

  As shown in FIG. 9A, an IC 611 or an IC 612 as a heat source is mounted on the side of the fan duct unit 301 of the first sub-substrate 401, and each of the ICs 611 and 612 uses a heat radiating rubber (not shown). The generated heat is transferred to the fan duct unit 301. Further, a first temperature detection unit 615 is mounted near the IC 611, and measures the temperature of the IC 611 based on a change in electric resistance.

  A power supply circuit component 613 for supplying power to the IC 611 and the IC 612 is mounted on the side of the first sub-board 401 shown in FIG. 9B. 411 (see FIG. 6B), the heat is transferred and radiated.

  FIG. 10 is a perspective view of the second sub-board 403. As shown in FIG. 10, an IC 631 serving as a heat source is mounted on the side of the fan duct unit 301 of the second sub-board 403, and the heat generated by the IC 631 is dissipated using a heat radiation rubber (not shown). Heat is transferred to 301. The second temperature detecting unit 632 is mounted near the IC 631, and measures the temperature of the IC 631 by a change in electric resistance.

  FIG. 11 is a perspective view of the power supply board 404. The power supply board 404 supplies power to the main board 400, the first sub-board 401, the third sub-board 402, the second sub-board 403, and electric devices 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 supplies power to a large number of electric devices using a large number of pins of the BtoB connector 643.

  FIG. 12A is a perspective view of the fan duct unit 301 as viewed from the rear side of the camera body 100, and FIG. 12B is a perspective view of the fan duct unit 301 as viewed from the front side of the camera body 100. FIG. 13A is a side view of the fan duct unit viewed from the direction of arrow D in FIG. 12B, and FIG. 13B is an exploded perspective view of the fan duct unit.

  As shown in FIGS. 12 and 13, a right duct 302, a left duct 303, and a left duct rear 304 are fixed to the fan duct unit 301 by screws 305. Further, inside the fan duct unit 301, two cooling fans 300 incorporated in a fan rubber 306 described later are provided side by side in the vertical direction in the figure. In the two cooling fans 300, the upper fan 300a is provided at the upper part, and the lower fan 300b is provided at the lower part. Hereinafter, when the cooling fan 300 is indicated, both the upper fan 300a and the lower fan 300b are indicated. The upper fan 300a and the lower fan 300b are fans of the same shape, and employ small axial fans. Therefore, the fan duct unit 301 can be downsized, and the camera body 100 is downsized. Further, by incorporating the cooling fan 300 into the fan rubber 306, vibration generated when the cooling fan 300 rotates is reduced. The right duct 302, the left duct 303, and the left duct rear 304 are formed of a metal material such as aluminum or magnesium, and the fan rubber 306 is formed of an elastic material such as silicon.

  Next, the fan duct unit 301 will be described with reference to FIG. The cooling fan 300 is held by the fan rubber 306 in the fan assembly 352 of the left duct rear 304. By doing so, the vibration generated by the rotation of a later-described blade 313 of the cooling fan 300 is prevented from affecting the camera body 100. Further, an outer rib 321 described later provided on the fan rubber 306 comes into contact with the right duct 302, and has an effect of preventing a backflow of air in the fan duct unit 301.

  Next, the upper fan 300a will be described with reference to FIG. FIG. 14A is a perspective view of the upper fan 300a, and FIG. 14B is a perspective view of the upper fan 300a shown in FIG.

  As shown in FIG. 14, the upper fan 300 a 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 upper fan 300a, and the motor rotates the blades 313 to generate a pressure difference to send air. Further, as the rotation detecting means 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 fan board is provided with a means for detecting the number of rotations of the blade 313 and performing feedback control so that the number of rotations of the blade 313 becomes a predetermined number of rotations, and the number of rotations can be controlled. In general, the axial fan can obtain a sufficiently large air volume by rotating the blade 313 at a low speed. By rotating the blade 313 at a low speed, noise noise such as wind noise and motor noise can be suppressed, which is optimal for a digital video camera.

  Next, the fan rubber 306 will be described with reference to FIG. FIG. 15A is a perspective view of the fan rubber 306, and FIG. 15B is a view showing a state in which the upper fan 300a is incorporated in the fan rubber 306. As shown in FIG. 15A, the fan rubber 306 is provided with an outer rib 321, an inner rib 322, and a notch 323 formed of an elastic material such as silicon rubber. The inner ribs 322 are provided at four corners inside the fan rubber 306. As shown in FIG. 15B, the fan rubber 306 is sandwiched by the inner ribs 322 to hold the upper fan 300a so as not to cover the openings on the suction side and the discharge side of the upper fan 300a.

  Next, the right duct 302 will be described with reference to FIG. FIG. 16A is a perspective view of the right duct 302 viewed from the rear side of the camera body 100, and FIG. 16B is a perspective view of the right duct 302 shown in FIG.

  As shown in FIG. 16A, the right duct 302 has a main board fixing section 332 and a power board fixing section 333 for fixing the main board 400 and the power board 404 with screws or the like. The right duct 302 is provided with a right duct protrusion 334 at a position corresponding to the IC 600, the IC 602, and the memory 603 mounted on the main board 400. The size of the right duct protrusion 334 is substantially equal to the size of the heat radiation rubber (not shown) attached to the right duct protrusion 334. Thus, heat generated by the IC 600, the IC 602, and the memory 603 can be transmitted to the right duct protrusion 334 via the heat radiation rubber.

  As shown in FIG. 16B, a right duct fin 331 is provided between the right duct upper wall 336 and the right duct lower wall 337 inside the right duct 302. A plurality of right duct fins 331 are arranged at predetermined intervals in the height direction of the camera body 100 in order to increase the heat radiation area.

  Next, the left duct 303 will be described with reference to FIG. FIG. 17A is a perspective view of the left duct 303, and FIG. 17B is a perspective view of the left duct 303 shown in FIG.

  As shown in FIG. 17A, the left duct 303 is provided with a sub-substrate fixing portion 342 for fixing the first sub-substrate 401 and the sub-substrate heat sink 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 IC 611, the IC 612, or the like mounted on the first sub-board 401. The size of the left duct protrusion 344 is substantially equal to the size of the heat radiation rubber attached to the left duct protrusion 344. Thus, heat generated by the ICs 611 and 612 can be transmitted to the left duct protrusion 344 via the heat radiation 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. 17B, inside the left duct 303, a plurality of left duct fins 341 are provided at predetermined intervals in the height direction of the camera body 100 in order to increase the heat radiation area. A separation wall 343 is provided at a substantially central portion inside the left duct 303. By incorporating the right duct upper wall 336 and the right duct lower wall 337 of the right duct 302 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 is eliminated, and dust and the like are eliminated. Rainwater intrusion can be prevented.

  Next, the left duct rear 304 will be described with reference to FIG. 18A is a perspective view of the left duct rear 304, and FIG. 18B is a perspective view of the left duct rear 304 shown in FIG.

  As shown in FIG. 18A, the left duct rear 304 is provided with a board fixing portion 353 for fixing the second sub-board 403 with screws or the like. The left duct rear 304 is provided with a heat radiation flat portion 355 at a position corresponding to the IC 631 mounted on the second sub-board 403. The heat generated by the IC 631 can be transmitted to the heat radiation flat portion 355 via a heat radiation rubber (not shown).

  As shown in FIG. 18B, inside the left duct rear 304, a plurality of left duct rear fins 351 for expanding a heat radiation area and two fan units 306 holding fan rubber 306 incorporating the cooling fan 300 are incorporated. A portion 352 is provided. A separation wall 354 is provided substantially at the center of the inside of 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. Thereby, the exhaust air from one of the two cooling fans 300 is prevented from being sucked into the other cooling fan 300, and the exhaust can be reliably exhausted.

  FIG. 19 is a sectional view taken along line AA of FIG. As shown in FIG. 19, the fan duct unit 301 includes a left duct fin 341 of the left duct 303 between right duct fins 331 adjacent to each other in the height direction of the camera body 100 of the right duct 302 (vertical direction in the drawing). Has been inserted. That is, the plurality of right duct fins 331 and the plurality of left duct fins 341 are alternately arranged in the height direction of the camera body 100. Thus, the air sucked in by the fan 300 passes through the gap between the right duct fin 331 and the left duct fin 341, thereby cooling the right duct 302 and the left duct 303. The separation wall 343 of the left duct 303 is in contact with the right duct 302, and separates the internal space formed by the right duct 302 and the left duct 303 into two upper and lower parts.

  The camera body 100 has a mode called a “normal mode” in which the cooling fan 300 is rotated in a forward direction in order to reduce the noise of the cooling fan 300 into the recorded sound. In the normal mode, the IC 600, the IC 611, the IC 631, and the like mounted on the main board 400, the first sub-board 401, and the second sub-board 403 generate heat. However, the airflow generated by the cooling fan 300 cools the right duct fin 331, the left duct fin 341 and the left duct fin 351 respectively, thereby preventing the temperature rise of the IC 600, the IC 611, and the IC 631.

  Further, unlike the normal mode, a “fan stop mode” for stopping the cooling fan 300 to sufficiently prevent noise from the cooling fan 300 is provided. The camera body 100 has various photographing modes, and the processing load status of each element changes, thereby changing the heat generation status of each element. Therefore, in the “fan stop mode”, the first and second temperature detection units 615 and 632 provided on the first sub-substrate 401 and the second sub-substrate 403 reach a predetermined temperature until the detected temperature reaches the predetermined temperature. The cooling fan 300 is stopped. Thereafter, when the detected temperatures of the first temperature detecting section 615 and the second temperature detecting section 632 reach a predetermined temperature, the cooling fan 300 is rotated.

  Here, the temperature that can be obtained from the first temperature detection unit 615 is t1, the temperature that can be obtained from the second temperature detection unit 632 is t2, and the guaranteed element temperatures of the ICs 611 and 631 are T1 and T2. A temperature obtained by subtracting the temperature of the thermistor from the guaranteed temperature of each element is defined as a margin temperature X, and the first margin temperature X1 and the second margin temperature X2 are calculated by the following equations.

X1 = T1-t1, X2 = T2-t2
When the margin temperature X is large, there is still room for the guaranteed temperature of each element, and it indicates that the detected temperature from each temperature detection unit is approaching the guaranteed temperature as the margin temperature X approaches 0 ° C.

  FIG. 20 is a flowchart illustrating an example of a cooling fan operation control process according to the first embodiment of the present invention. The processing according to the illustrated flowchart is performed by the CPU 152 expanding a program stored in the ROM 153 into the RAM 154 and executing the program. The upper fan 300a and the lower fan 300b have the same rotation start timing and stop timing, and are controlled to operate at the same rotation speed.

  When the processing is started, the CPU 152 determines whether or not the power has been turned on by operating the power button 202 (step S101). If the power is not turned on (NO in step S101), CPU 152 waits. On the other hand, when the power is turned on (YES in step S101), CPU 152 drives cooling fan 300 in the forward rotation.

  Subsequently, the CPU 152 determines whether or not recording has been started by operating the shooting button 201 (step S103). At the time of recording, it is assumed that sound is recorded simultaneously. If the shooting button 201 has not been pressed (NO in step S103), the CPU 152 continues to drive the cooling fan 300, and proceeds to step S112.

  On the other hand, when recording has been started (YES in step S103), CPU 152 determines whether or not the mode is the fan stop mode (step S104). When the normal mode is set instead of the fan stop mode (NO in step S104), CPU 152 continues to drive cooling fan 300, and proceeds to step S110. If the mode is the fan stop mode (YES in step S104), CPU 152 stops cooling fan 300 (step S105).

  Next, in step S106, the CPU 152 calculates the first surplus temperature X1 and the second surplus temperature X2 from the temperature data obtained from the first temperature detecting unit 615 and the second temperature detecting unit 632, and writes them into the RAM 154. . Then, the CPU 152 compares with a predetermined temperature preset in the ROM 153 to determine whether the first margin temperature X1 and the second margin temperature X2 are lower than the predetermined temperature (step S106). If neither the first surplus temperature X1 nor the second surplus temperature X2 exceeds the predetermined temperature (NO in step S106), CPU 152 proceeds to the process of step S110. On the other hand, when either the first margin temperature X1 or the second margin temperature X2 is equal to or higher than the predetermined temperature (YES in step S106), the process proceeds to step S107.

  In step S107, the CPU 152 compares the first marginal temperature X1 with the second marginal temperature X2. When the first margin temperature X1 is lower than the second margin temperature X2 (YES in step S107), CPU 152 drives cooling fan 300 at normal rotation (step S108). When the first margin temperature X1 is higher than the second margin temperature X2 (NO in step S107), CPU 152 reverses the rotation direction of cooling fan 300 and drives it in reverse rotation (step S109), and proceeds to step S113. .

Subsequently, in step S113, the CPU 152 determines whether or not the recording has been stopped by operating the shooting button 201. When the recording is stopped (YES in step S113), CPU 152 reverses the rotation direction of cooling fan 300 and drives the cooling fan 300 in the forward rotation (step S111). If the recording has not been stopped (NO in step S113), the process proceeds to step S114. In step S114, the first margin temperature X1 and the second margin temperature X2 are compared again. If the first surplus temperature X1 is lower than the second surplus temperature X2 (YES in step S114), CPU 152 reverses the rotation direction of cooling fan 300 and drives the cooling fan 300 at normal rotation (step S108). When the first margin temperature X1 is higher than the second margin temperature X2 (NO in step S114), the process returns to step S113 again.
In step S110, the CPU 152 determines whether or not the recording has been stopped by operating the shooting button 201. When the recording is stopped (YES in step S110), the process proceeds to step S111, in which CPU 152 drives cooling fan 300 by rotating forward. If the recording has not been stopped (NO in step S110), the process proceeds to step S104, and the process from step S104 is repeated.

  In step S112, the CPU 152 determines whether or not the power has been turned off by operating the power button 202. If the power is not turned off (NO in step S112), the process returns to step S103. On the other hand, when the power is turned off (YES in step S112), the process proceeds to step S115, in which CPU 152 stops cooling fan 300 and ends the process.

  Next, the above processing will be described in detail with reference to FIG.

  FIG. 21A is a diagram for explaining, in a time series, a case where the rotation direction is not switched in the operation control process of the fan stop mode in the first embodiment, and FIG. 21B is a diagram illustrating a case where the rotation direction is switched. It is a figure for explaining by a series. The upper part of the figure shows the rotation state of the fan cooling fan 300 over time, and the lower part of the figure shows the first spare temperature X1 and the second spare temperature X2 over time. The dotted line indicates the first surplus temperature X1, and the second surplus temperature X2 is indicated by a solid line.

  In FIG. 21A, in step S102 before the start of recording in step S103, since no sound is recorded, the CPU 152 drives the cooling fan 300 to rotate at high speed in the normal direction. When the recording is started, the rotation of the cooling fan 300 is stopped as described above (step S105). During step S105, since the cooling fan 300 is stopped, the IC 611 and the IC 631 generate heat, and the margin temperature approaches 0 ° C. In FIG. 21A, when the first margin temperature X1 indicated by the dotted line becomes equal to or lower than the predetermined temperature (YES in step S106), CPU 152 compares first margin temperature X1 with second margin temperature X2 (step S107). ). Since the first allowance temperature X1 is lower than the second allowance temperature X2, the cooling fan 300 starts to be driven by normal rotation (step S108). When the cooling fan 300 rotates in the forward direction, the right duct fins 331 and the left duct fins 341 arranged on the intake side of the cooling fan 300 are cooled by the cold airflow of the outside air, so that the main board 400 and the first The temperature of the sub-substrate 401 decreases. On the other hand, the air heated by the right duct fin 331 and the left duct fin 341 hits the left duct rear fin 351 disposed on the exhaust side of the cooling fan 300. Although temporarily, the temperature of the left duct rear fin 351 increases, and as a result, the temperature of the second sub-board 403 increases. However, although the second margin temperature X2 approaches 0 ° C., if the cooling fan 300 continues to be driven as it is, cool air is taken in and cooled sufficiently. In addition, all the components such as the IC 611 and the IC 631 are cooled, and the margin temperature of both the first margin temperature X1 and the second margin temperature X2 increases. Thereafter, when the recording is stopped (YES in step S110), the fan is driven to rotate at a high speed (step S111).

  In FIG. 21B, in step S102 before the start of recording in step S103, since no sound is recorded, the cooling fan 300 is driven to rotate at high speed. When the recording is started, the rotation of the cooling fan 300 is stopped as described above (step S105). During step S105, since the cooling fan 300 is stopped, the IC 611 and the IC 631 generate heat, and the first margin temperature X1 and the second margin temperature X2 approach 0 ° C. In FIG. 21B, when the second margin temperature X2 indicated by the solid line becomes equal to or lower than the predetermined temperature (YES in step S106), CPU 152 compares first margin temperature X1 with second margin temperature X2. Since the first margin temperature X1 is higher than the second margin temperature X2, the cooling fan 300 starts to be driven in reverse rotation (step S109). When the cooling fan 300 rotates in the reverse rotation, the left duct rear fin 351 disposed closer to the intake side than the cooling fan 300 is cooled by hitting the cooled outside airflow, and the temperature of the second sub-board 403 decreases. . On the other hand, the air heated by the left duct rear fin 351 hits the right duct fin 331 and the left duct fin 341 arranged on the exhaust side of the cooling fan 300. Although temporarily, the temperature of the first sub-substrate 401 rises, and as a result, the first margin temperature X1 approaches 0 ° C. In step S109, since the exhaust air is exhausted from the front vent 230, noise of the cooling fan 300 is likely to be mixed in by the microphone. Therefore, when the cooling fan 300 is rotated in the reverse direction, it is rotated at a low speed. After that, in step S114, the CPU 152 compares the first marginal temperature X1 with the second marginal temperature X2. When the first surplus temperature X1 becomes lower than the second surplus temperature X2 (YES in step S114), cooling fan 300 starts to be driven to rotate forward (step S108). Thereafter, when the recording is stopped (YES in step S110), CPU 152 drives cooling fan 300 at a high speed with a forward rotation (step S111). Although not shown in FIG. 21B, if the recording is not stopped (NO in step S110), the process proceeds to step S104, and the processes from step S105 to step S108 are repeated.

(Second embodiment)
Subsequently, an example of the imaging device according to the second embodiment of the present invention will be described. The configuration of the camera according to the second embodiment is the same as that of the digital video camera shown in FIGS. FIG. 22 is a flowchart illustrating an example of a fan operation control process according to the second embodiment of the present invention. In the flowchart of FIG. 22, the same steps as those in the flowchart of FIG. 20 are denoted by the same reference numerals, and description thereof will be omitted.

  In step S107, the CPU 152 compares the first marginal temperature X1 with the second marginal temperature X2. If the first margin temperature X1 is lower than the second margin temperature X2 (YES in step S107), CPU 152 drives upper fan 300a and lower fan 300b in forward rotation (step S108). If the first margin temperature X1 is higher than the second margin temperature X2 (NO in step S107), CPU 152 drives upper fan 300a in reverse rotation and lower fan 300b in normal rotation (step S209), and proceeds to step S209. Proceed to S113. Thereafter, the same processing as in step S113 and subsequent steps shown in FIG. 20 is performed.

  FIG. 23A is a diagram for explaining, in a time series, a case where the rotation direction is not switched in the operation control process of the fan stop mode in the second embodiment, and FIG. 23B is a diagram illustrating a case where the rotation direction is switched. It is a figure for explaining by a series. The upper part of the figure shows the rotation state of the fan upper fan 300a and the lower fan 300b over time, and the lower part of the figure shows the state of the first margin temperature X1 and the second margin temperature X2 over time. The dotted line indicates the first surplus temperature X1, and the second surplus temperature X2 is indicated by a solid line.

  In FIG. 23A, in step S102 before the start of recording in step S103, since no sound is recorded, the upper fan 300a and the lower fan 300b are driven to rotate at high speed in the forward direction. When the recording is started, the rotation of the upper fan 300a and the lower fan 300b is stopped as described above (step S105). During step S105, since the upper fan 300a and the lower fan 300b are stopped, the IC 611 and the IC 631 generate heat, and the margin temperature approaches 0 ° C. In FIG. 23A, when the first margin temperature X1 indicated by the dotted line becomes equal to or lower than the predetermined temperature (YES in step S106), CPU 152 compares first margin temperature X1 with second margin temperature X2 (step S107). ). Since the first allowance temperature X1 is lower than the second allowance temperature X2, the upper fan 300a and the lower fan 300b start to be driven in the forward rotation (Step S108). When the upper fan 300a and the lower fan 300b are rotated in the forward direction, the right duct fin 331 and the left duct fin 341 arranged on the intake side of the upper fan 300a and the lower fan 300b are exposed to the cool airflow of the outside air. The temperature of the main substrate 400 and the first sub-substrate 401 is lowered. On the other hand, since the air heated by the right duct fin 331 and the left duct fin 341 hits the left duct rear fin 351 disposed on the exhaust side of the upper fan 300a and the lower fan 300b, the left duct rear is temporary. The temperature of the fins 351 increases, and as a result, the temperature of the second sub-substrate 403 also increases (the solid line temporarily increases). If the upper fan 300a and the lower fan 300b continue to be driven as they are, all components such as the IC 611 and the IC 631 are cooled (both dotted and solid lines are lowered). Thereafter, when the recording is stopped (YES in step S110), the fan is driven to rotate at a high speed (step S111).

  In FIG. 23B, in step S102 before the start of recording in step S103, the upper fan 300a and the lower fan 300b are driven to rotate at high speed because no sound is recorded. When the recording is started, the rotation of the upper fan 300a and the lower fan 300b is stopped as described above (step S105). During step S105, since the upper fan 300a and the lower fan 300b are stopped, the IC 611 and the IC 631 generate heat, and the margin temperature approaches 0 ° C. In FIG. 21B, when the second margin temperature X2 indicated by the solid line becomes equal to or lower than the predetermined temperature (YES in step S106), CPU 152 compares first margin temperature X1 with second margin temperature X2. Since the first allowance temperature X1 is higher than the second allowance temperature X2, the upper fan 300a starts driving in the reverse rotation and the lower fan 300b starts driving in the normal rotation (step S209).

  By rotating the upper fan 300a in the reverse direction, the upper half of the front ventilation port 230 becomes an exhaust port, and the upper half of the rear ventilation port 240 becomes an intake port. In addition, the lower fan 300b rotates forward, so that the lower half of the front ventilation port 230 becomes an intake port and the lower half of the rear ventilation port 240 becomes an exhaust port. Since the separation wall 343 and the separation wall 354 are provided in the fan duct unit 301, the wind does not mix inside the fan duct unit 301. Therefore, the air heated by the fins provided in the fan duct unit 301 is reliably discharged to the outside of the camera body 100.

  When the upper fan 300a is driven in reverse rotation and the lower fan 300b is driven in forward rotation, in the fan duct unit 301, the distance from the fan to the outlet of the exhaust port is longer on the upper flow path side including the upper fan 300a. Therefore, the ventilation resistance increases. When the ventilation resistance increases, the exhaust heat efficiency decreases, so that the temperature of the first sub-substrate 401 temporarily increases (the dotted line temporarily increases). By rotating one of the cooling fans in the reverse direction and rotating the other in the forward direction, the speed at which the temperature of the element that is the exhaust of the cooling fan rises can be reduced. In step S209, since the exhaust air of the upper fan 300a is exhausted from the front vent 230, noise of the cooling fan 300 is likely to be mixed in by the microphone. Therefore, the upper fan 300a is rotated at a low speed of reverse rotation. After that, in step S114, the first marginal temperature X1 and the second marginal temperature X2 are compared. If the first allowance temperature X1 is lower than the second allowance temperature X2 (YES in step S114), the cooling fan 300 (the upper fan 300a and the lower fan 300b) starts to be driven by normal rotation (step S108). Thereafter, when the recording is stopped (YES in step S110), the upper fan 300a and the lower fan 300b are driven at a high speed with a forward rotation (step S111). Although not shown in FIG. 23B, if the recording has not been stopped (NO in step S110), the process proceeds to step S104, and the processes from step S105 to step S108 are repeated.

  As described above, in an imaging apparatus that cools a plurality of substrates by using the air flow on both the intake side and the exhaust side of the cooling fan, the imaging device includes a fan stop mode for stopping the cooling fan after recording starts, and When the temperature rises, the cooling fan is rotated to provide an imaging device that does not exceed the guaranteed temperature of the components mounted on the substrate in the imaging device.

  Note that the configuration of the present invention is not limited to those exemplified in the above embodiment, and the material, shape, dimensions, form, number, location, and the like can be appropriately changed without departing from the gist of the present invention. It is. As described above, the preferred embodiments of the present invention have been described, but the present invention is not limited to these embodiments, and various modifications and changes can be made within the scope of the gist.

  For example, the function of the above-described embodiment may be used as a control method, and the control method may be executed by the imaging apparatus. Further, a program having the functions of the above-described embodiments may be used as a control program, and the control program may be executed by a computer included in the imaging apparatus. The control program is recorded on a computer-readable recording medium, for example.

(Other embodiments)
The present invention supplies a program for realizing one or more functions of the above-described embodiments to a system or an apparatus via a network or a storage medium, and one or more processors in a computer of the system or the apparatus read and execute the program. This processing can be realized. Further, it can be realized by a circuit (for example, an ASIC) that realizes one or more functions.

100 camera body, 101 lens barrel, 102 handle,
103 shoulder unit, 104 viewfinder

Claims (4)

At least one or more substrates on which a plurality of temperature detection units are mounted,
With a cooling fan arranged in the duct,
The substrate is thermally connected to the duct,
In an imaging device configured to cool the substrate using an airflow of the cooling fan,
The first temperature detecting section is disposed at a portion connected to the duct between the intake port and the cooling fan, and the second temperature detecting section is connected to the duct between the cooling fan and the exhaust port. Placed in
The cooling fan is capable of reversing the rotation direction to forward rotation and reverse rotation, and provided with control means for determining the rotation direction of the cooling fan,
When the cooling fan is stopped immediately after the recording and it is detected that any one of the plurality of temperature detection units has exceeded the predetermined temperature, an arbitrary range in which the temperature detection unit that detects the detected temperature is mounted. In order to cool, the rotation direction of the cooling fan is determined and rotated,
After that, the imaging apparatus further comprises control means for comparing the detection temperatures of the plurality of temperature detection units and changing the rotation direction.   The imaging device according to claim 1, wherein the rotation speed of the cooling fan in a state of recording is lower than that in a state of no recording. At least one or more substrates on which a plurality of temperature detection units are mounted,
With a cooling fan arranged in the duct,
The substrate is thermally connected to the duct,
In an imaging device configured to cool the substrate using an airflow of the cooling fan,
The first temperature detecting section is disposed at a portion connected to the duct between the intake port and the cooling fan, and the second temperature detecting section is connected to the duct between the cooling fan and the exhaust port. Placed in
The cooling fan is capable of reversing the rotation direction to forward rotation and reverse rotation, and provided with control means for determining the rotation direction of the cooling fan,
When the cooling fan is stopped immediately after recording, and when it is detected that any one of the plurality of temperature detectors has exceeded a predetermined temperature, an arbitrary range in which the temperature detector that detects the detected temperature is mounted. In order to cool, the rotation direction of the cooling fan is determined and rotated,
Thereafter, the control method includes a step of comparing the detection temperatures of the plurality of temperature detection units to change the rotation direction. At least one or more substrates on which a plurality of temperature detection units are mounted,
With a cooling fan arranged in the duct,
The substrate is thermally connected to the duct,
In an imaging device configured to cool the substrate using an airflow of the cooling fan,
The first temperature detecting section is disposed at a portion connected to the duct between the intake port and the cooling fan, and the second temperature detecting section is connected to the duct between the cooling fan and the exhaust port. Placed in
The cooling fan is capable of reversing the rotation direction to forward rotation and reverse rotation, and provided with control means for determining the rotation direction of the cooling fan,
When the cooling fan is stopped immediately after recording, and when it is detected that any one of the plurality of temperature detectors has exceeded a predetermined temperature, an arbitrary range in which the temperature detector that detects the detected temperature is mounted. In order to cool, the rotation direction of the cooling fan is determined and rotated,
Thereafter, the control program executes the step of comparing the detected temperatures of the plurality of temperature detecting units to change the rotation direction.