WO2015025687A1

WO2015025687A1 - Electronic device

Info

Publication number: WO2015025687A1
Application number: PCT/JP2014/070065
Authority: WO
Inventors: 誠稲垣; 崇弘大黒; 祐樹松永
Original assignee: 株式会社日立国際電気
Priority date: 2013-08-19
Filing date: 2014-07-30
Publication date: 2015-02-26
Also published as: JPWO2015025687A1; JP6112745B2

Abstract

[Problem] To efficiently radiate heat generated from a plurality of heat-generating components within a housing in an electronic device equipped with the plurality of heat-generating components. [Solution] This electronic device is provided with a radiator which is composed of a radiation fin part and a fin base in order to cool a first heat-generating component within the device, and an air blowing part which generates cooling air to be sent out to the radiation fin part. The electronic device has a cooling structure formed by a first flow path through which the cooling air from the air blowing part flows to the radiation fin part side of the radiator to form an impinging jet, a second flow path through which part of the cooling air from the air blowing part passes the outside of the radiator, and a third flow path through which the cooling air that has passed through the second flow path passes the fin base side of the radiator, the first heat-generating component brought into contact with the fin base in a thermally conductive manner is cooled by the cooling air flowing through the first flow path via the radiator, and a second heat-generating component mounted in the third flow path is cooled by the cooling air flowing through the third flow path.

Description

Electronic equipment

The present invention relates to an electronic device having a cooling structure. For example, the electronic device is used in an electronic device having a plurality of heat generating components such as a video camera, and distributes an appropriate amount of cooling air to each of the plurality of heat generating components. Thus, the present invention relates to an electronic device configured to efficiently dissipate heat from a plurality of heat generating components generated inside the housing.

∙ Video cameras have different external shapes depending on the purpose of use, and can be broadly divided into portable types and fixed types. The former includes video cameras for TV program production, news gathering, event video recording, etc. Depending on the application, handy types that emphasize mobility and high-performance high-magnification lenses can be attached, and various operation functions are provided. It has an outer shape such as a studio type. Examples of the latter include medical cameras, weather observation cameras, security cameras, etc. Generally, there are many box-shaped shapes that are easy to manufacture and have good mounting efficiency because they are mounted at a fixed position. In addition, since a fixed camera requires screw portions for fixing a fixed position at the top and bottom of the housing, the upper and lower surfaces of the camera housing must be flat.

The need common to these video cameras is the miniaturization of the cameras. In recent years, the video cameras have been miniaturized and mounted with a high density in the same manner as other electronic devices. In particular, in a high-definition video camera, since the number of pixels of the image sensor and the drive frequency increase, the amount of heat generated by the image sensor and its drive circuit also increases. In recent video cameras, the use of digital circuits for video signal processing has become mainstream. When a circuit is digitized, the circuit scale is usually much larger than that of an analog circuit. Therefore, in general, a digital circuit is integrated in a large-scale LSI to reduce the size of the circuit.
However, in a large-scale LSI in which the above-mentioned high-definition video camera circuit is made into one chip, a theoretical circuit exceeding 5 million gates operates at a system clock rate of 75 MHz or more, so that the power consumption of one LSI is 7 to 10 W. If the forced air cooling structure using a fan is not applied, there is a problem that the temperature rises, causing damage to parts and shortening the service life.

Therefore, a conventional video camera including a fan will be described with reference to FIGS. FIG. 7 is a front perspective view showing the appearance of a conventional video camera. FIG. 8 is a view showing a KK section along a vertical plane passing through the center of the lens portion 55 of the video camera 100 in FIG. 7 and 8 show a state in which a housing cover for covering the entire video camera is removed.
As shown in FIGS. 7 and 8, the conventional video camera 100 includes a front panel 50, a right side plate 51, a left side plate 52, a rear panel 53 to which a fan 59 is attached, a housing bottom plate 54, and a partition plate 63. A lens unit 55, a first circuit board 56, a radiator 57, and a duct 58 are provided in the housing.
On the first circuit board 56, an imaging element 56a that is a main heat generating component and an electronic component 56b that is another heat generating component are mounted.
The radiator 57 is attached so that a part of the fin base passes through a square hole provided in the first circuit board 56 and is in close contact with the back surface of the image sensor 56a, and is arranged in the left-right direction on the opposite side of the fin base. The plurality of radiating fins 57a are provided upright.
The duct 58 has openings 58 a for guiding the cooling air discharged from the fan 59 to the radiating fins 57 a of the radiator 57.

In addition, the video camera 100 includes a second circuit board 61 on which the heat generating component 61a is mounted and a third circuit board 62 on which the heat generating component 62a is mounted above the partition plate 63, and includes a second circuit. The board 61 and the third circuit board 62 are attached to the partition plate 63 in a two-tiered manner via a support column 64.
In addition, the video camera 100 includes a chamber 60 having an opening 60a and an opening 60b above and below the radiation fins 57a of the radiator 57, respectively.

Next, a cooling method of the conventional video camera 100 will be described with reference to FIG.
In the video camera 100, when the fan 59 is operated, outside air is introduced into the fan 59 from the rear, and the cooling air discharged from the fan 59 is provided with an opening 53a and a duct provided in the rear panel 53 as indicated by white arrows. It passes through the opening 58 a provided in 58 and is sprayed to the heat radiating fins 57 a of the heat radiator 57.
The cooling air sprayed onto the heat radiating fins 57a passes through the gaps between the plurality of heat radiating fins 57a and hits the roots of the heat radiating fins 57a to form a collision jet. The image sensor 56a, which is a main heat generating component arranged in close contact with the base, is cooled.
Further, the cooling air flowing downward along the radiation fins 57a is discharged to the outside of the housing from a slit (not shown) provided in the housing bottom plate 54.
Further, the cooling air flowing upward along the heat radiation fins 57 a flows into the chamber 60 from the opening 60 a of the chamber 60, and the pressure is increased in the chamber 60. The cooling air whose pressure is increased in the chamber 60 is blown forward from the opening 60b toward the second circuit board 61 and the third circuit board 62, whereby the second circuit board 61 and the third circuit board 62 are blown out. The heat generating component 61a and the heat generating component 62a mounted on the circuit board 62 are cooled.

In the video camera 100 described above, by incorporating a Peltier element in the imaging element 56a that is the main heat generating component, or by sandwiching the Peltier element between the imaging element 56a and the radiator 57, In some cases, a current is supplied to the Peltier element to forcibly release heat from the imaging element 56a to the radiator 57.

In Patent Document 1, in a camera case cooling structure for convection and air circulation of heat generated by an image pickup device, a heat release fin for radiating heat generated in the image pickup device, and an air flow toward the heat release fin A partition member having a plurality of openings at positions corresponding to the air outlets of the fan and a fan installed between the heat radiating fins and the fan, A cooling structure comprising a chamber for blowing in a direction is disclosed.

JP 2010-41085 A

As described above, the conventional video camera 100 is provided with the radiator 57 for cooling the image pickup element 56a which is the main heat generating component, and the cooling air from the fan 59 toward the radiation fin 57a of the radiator 57 is provided. The image pickup device 56a is cooled by jetting. The cooling air that has flowed upward along the radiation fins 57a of the radiator 57 passes through the chamber 60, cools the heat generating components 61a and the heat generating components 62a other than the image sensor 56a, and then is discharged to the outside.
However, for example, an electronic component 56b such as a signal processing semiconductor element for taking out an electric signal from the image sensor 56a is provided on the back surface of the first circuit board 56 shown in FIG. The signal processing semiconductor element is also one of the heat generating components, but since it is mounted on the M part or the N part of the first circuit board 56 facing the fin base of the radiator 57, heat dissipation is performed. There is a problem that the cooling air from the fan 59 is not supplied to the electronic component 56b by being blocked by the device 57, and the temperature of the electronic component 56b becomes high.

Further, in order to cool the electronic component 56b which is a heat generating component other than the main heat generating component mounted on the first circuit board 56, it is formed between the electronic component 56b and the radiator 57 by, for example, silicon rubber or the like. There is a method of cooling the electronic component 56b by sandwiching a heat conductive sheet having excellent heat conductivity so that the heat generated from the electronic component 56b is conducted to the radiator 57 through the heat conductive sheet.
However, in this case, the heat of the electronic component 56b, which is a heat generating component other than the main heat generating component, increases the temperature of the radiator 57, making it difficult to reduce the temperature of the image sensor 56a, which is the main heat generating component. There is a drawback in that a cooling fin having a higher cooling effect and a cooling fan are required, and therefore the cooling device becomes large and extra cooling power is applied.
In addition, since the electronic component 56b that is a heat generating component other than the main heat generating component does not need to be as low as the imaging element 56a that is the main heat generating component, the electronic component 56b is excessively cooled by the above method. .
It should be noted that a Peltier element is built in the image sensor 56a which is a main heat generating component, or a Peltier element is sandwiched between the image sensor 56a and the heat radiator 57 to dissipate heat from the image sensor 56a to the heat radiator 57. In the case where it is forcibly performed, the cooling efficiency of the radiator 57 is further reduced.
Here, as the heat generating components other than the main heat generating components, there may be electronic components that need to be cooled in addition to the heat generating components 61a, the heat generating components 62a, and the electronic components 56b.

The present invention has been made to solve such a problem, and it is possible to separately cool the main heat generating component and the heat generating component other than the main heat generating component, while ensuring the necessary cooling performance of the main heat generating component. An object of the present invention is to provide an electronic device capable of cooling a heat generating component other than the main heat generating component. In addition, in electronic devices equipped with multiple heat generating components that require different temperatures for normal operation, the cooling performance required for the main heat generating components is distributed by distributing the appropriate amount of cooling air to each of the multiple heat generating components. It is an object of the present invention to provide an electronic device that can efficiently dissipate heat from a plurality of heat generating components generated inside a housing while ensuring the above.

In order to achieve the above object, an electronic device according to the present invention includes a radiator for cooling the first heat-generating component in the device composed of a radiating fin portion and a fin base, and cooling sent to the radiating fin portion. A first flow path in which an impinging jet is formed by the cooling air from the blower section flowing toward the heat radiating fin section of the radiator. , A second flow path in which a part of the cooling air from the blower passes through the outside of the radiator, and a cooling air that has passed through the second flow path passes through the fin base side of the radiator. A first heat-generating component that is in contact with the fin base so as to be able to conduct heat is cooled through the first flow path via the radiator. Cooled by wind and mounted on the third flow path The heat-generating components, characterized in that it is cooled by cooling air flowing through the third flow passage.

In addition, the electronic device according to the present invention for achieving the above object is a circuit board in which the cooling air of the second flow path is guided to the third flow path at a position facing the fin base. And the third flow path is formed by a gap between the fin base and the circuit board.
In addition, the electronic device according to the present invention for achieving the above object is characterized in that the first heat generating component and the second heat generating component are mounted on the circuit board.
The electronic device according to the present invention for achieving the above object is characterized in that the first heat generating component and the second heat generating component can be cooled to different temperatures.
The electronic device according to the present invention for achieving the above object is characterized in that the first heat generating component has a larger amount of heat generation than the second heat generating component.

Moreover, the electronic device according to the present invention for achieving the above object is characterized in that the air blowing section is installed eccentrically with respect to the radiator.
Moreover, the electronic device according to the present invention for achieving the above object is characterized in that the blower portion has an outer diameter larger than that of the radiator.

According to another aspect of the present invention, there is provided an electronic device according to the present invention, wherein a duct portion is disposed between the heat radiating fin portion and the air blowing portion, and the first flow is provided by an opening provided in the duct portion. A path and the second flow path are formed. Further, in the electronic device according to the present invention for achieving the above object, the radiator is configured to block a bottom surface of the radiating fin portion, from the opening provided below the duct portion, from the air blowing portion. The cooling air is caused to collide with the lower side of the radiating fin portion, and the cooling air flows from the lower side to the upper side through the gap of the radiating fin portion.

The electronic device according to the present invention for achieving the above object is characterized in that the cooling air rises from the radiating fin portion and cools the third heat generating component disposed on the upper surface substrate.
According to another aspect of the present invention, there is provided an electronic device according to a fourth flow of the cooling air from the second flow path through which the cooling air that has not flowed into the third flow path passes. And a fourth heat generating component on the fourth flow path.

In order to achieve the above object, an electronic device according to the present invention includes a first circuit board on which a main heat generating component and a heat generating component other than the main heat generating component are mounted, and the heat dissipation of the main heat generating component. A radiator having a fin base that is in contact with the main heat-generating component so as to conduct heat, and a radiating fin portion formed on the opposite side of the fin base, and a blower that generates cooling air to be sent to the radiating fin portion And a duct having an opening that is disposed between the radiating fin portion and the blower and that forms a flow path for the cooling air that is sent from the blower to the radiating fin. The heat generating component is an electronic device mounted on the surface of the first circuit board in contact with the main heat generating component and the fin base of the radiator so as to be capable of conducting heat, and the size of the opening of the duct Said heat dissipation The first circuit board is configured to protrude from one side of the heat sink fin portion in the same direction as the opening of the duct, and the blower is configured to protrude from the fin portion to one side. The cooling air from which the cooling air has passed through the opening of the duct and injected into the heat radiating fin portion, and the cooling air that has passed through the protruding portion of the opening of the duct A part of the cooling air is divided into a second flow path that is injected so as to pass through the outside of the heat radiating fin portion, and a part of the cooling air that has flowed through the second flow path is the first circuit. After colliding with the substrate, it flows into the gap between the first circuit board and the fin base of the radiator to form a third flow path for cooling the heat generating components other than the main heat generating components.

According to another aspect of the present invention, there is provided an electronic apparatus according to the present invention, wherein the main heat generating component is an image sensor, and a heat generating component other than the main heat generating component extracts an electric signal from the image sensor. It is characterized by including an element.

As described above, according to the present invention, the main heat generating component and the heat generating component other than the main heat generating component can be separately cooled, so that the cooling performance of the main heat generating component is not affected. The heat generating component can be cooled. In addition, in electronic devices equipped with multiple heat generating components that require different temperatures for normal operation, the cooling performance required for the main heat generating components is distributed by distributing the appropriate amount of cooling air to each of the multiple heat generating components. It is possible to efficiently dissipate heat from a plurality of heat generating components generated inside the housing while ensuring the above.

It is an external appearance perspective view which shows an example of the electronic device which concerns on Embodiment 1 to which this invention is applied. (A) is a front perspective view, (b) is a rear perspective view. It is a disassembled perspective view which shows the structure of the electronic device which concerns on Embodiment 1 to which this invention is applied. FIG. 2 is a view showing a cross section taken along line FF along a vertical plane passing through the center of a lens unit 18 of the video camera 1 in FIG. FIG. 2 is a diagram showing an EE cross section of a horizontal plane of the video camera 1 in FIG. 1. It is a figure which shows the GG cross section of the vertical surface of the video camera 1 in FIG. It is a disassembled perspective view for demonstrating the flow of the cooling air discharged from the fan in the electronic device which concerns on Embodiment 1 to which this invention is applied. It is a front perspective view which shows the external appearance of the conventional video camera. It is a figure which shows the KK cross section along the vertical plane which passes along the center of the lens part 55 of the video camera 100 in FIG.

<Embodiment 1> [Configuration of Electronic Device] Hereinafter, the configuration of an electronic device according to Embodiment 1 to which the present invention is applied will be described in detail with reference to FIGS. In this example, the electronic apparatus according to the first embodiment to which the present invention is applied will be described as a video camera.
1A and 1B are external perspective views showing an example of an electronic apparatus according to Embodiment 1 to which the present invention is applied. FIG. 1A is a front perspective view, and FIG. 1B is a rear perspective view. FIG. 2 is an exploded perspective view showing the configuration of the electronic apparatus according to the first embodiment to which the present invention is applied. FIG. 3 is a diagram showing an FF section along a vertical plane passing through the center of the lens portion 18 of the video camera 1 in FIG. FIG. 4 is a diagram showing an EE cross section of the horizontal plane of the video camera 1 in FIG. FIG. 5 is a diagram showing a GG section of the vertical plane of the video camera 1 in FIG.

As shown in FIGS. 1 to 5, the video camera 1 as the electronic apparatus according to the first embodiment to which the present invention is applied includes a housing bottom plate 15 and six support columns 17 erected on the housing bottom plate 15. The front panel 10, the board mounting bracket (3) 11, the board mounting bracket (4) 12, the rear panel 13, the board mounting bracket (2) 26, the top frame 14, and the housing cover 16 are each screwed to the column 17. As a result, a housing structure is formed.
The third circuit board 24 on which the heat generating component 24a is mounted is fixed to the board mounting bracket (3) 11, and the second circuit board 23 on which the heat generating component 23a is mounted is fixed to the board mounting bracket (2) 26. The fourth circuit board 25 is fixed to the board mounting bracket (4) 12.
A fan 22 and a filter 28 are attached to the rear panel 13, and the rear panel 13 has an opening 13 a for sucking outside air when the fan 22 operates.

In addition, a lens unit 18, a first circuit board 19, a radiator 20, a duct 21, and a metal fitting 27 are attached in the casing of the video camera 1.
As shown in FIGS. 3 and 4, the first circuit board 19 has an image pickup device 19a that is a main heat generating component and a surface for taking out an electric signal from the image pickup device 19a on a surface different from the mounting surface of the image pickup device 19a. A heat generating component 19b other than the main heat generating component such as a signal processing semiconductor element is mounted.
The radiator 20 is attached so that a part of the fin base passes through a square hole provided in the first circuit board 19 and is in close contact with the back surface of the image sensor 19a, and is arranged in the left-right direction on the opposite side of the fin base. The plurality of radiating fins 20a are provided upright. The radiator 20 may be in contact with the image sensor 19a so as to be capable of conducting heat.
The duct 21 has an opening 21 a for compressing the cooling air discharged from the fan 22 to increase the pressure and injecting it toward the heat radiating fins 20 a of the heat radiator 20.
The metal fitting 27 is a metal fitting for closing the lower end of the radiation fin 20 a of the radiator 20.

Further, as shown in FIG. 4, the fan 22 is arranged to be shifted to the right or eccentric with respect to the center line of the radiation fin 20a of the radiator 20 provided to cool the imaging element 19a. 4 and 5, the width (H2) of the opening 21a of the duct 21 is set wider than the width (H1) of the radiating fin 20a in the left-right direction, and the opening 21a of the duct 21 is set. Is projected from the right end of the radiating fin 20a (P portion (lattice portion in FIG. 5)). Accordingly, the pressure of the cooling air discharged from the fan 22 is increased in the duct 21, and the cooling air W <b> 1 ejected from the opening 21 a of the duct 21 toward the heat radiation fin 20 a and the P of the opening 21 a of the duct 21. The cooling air W2 that passes through the right outer side of the radiating fin 20a from the part (lattice part), collides with the right end of the first circuit board 19 and flows in the left direction, and the P part (lattice part) of the opening 21a of the duct 21 The cooling wind W3 passes through the right outer side of the heat radiating fin 20a, collides with the right end of the first circuit board 19, flows in the right direction, and further advances straight while being bent.
In the present embodiment, the fan 22 is arranged so as to be shifted rightward or eccentric with respect to the center line of the radiating fin 20a, but a fan having a size larger than that of the radiating fin 20a should be used. May be arranged so that the center line of the radiating fin 20a coincides with the center line of the fan, and only the opening portion of the duct may be set as described above. May be larger.
Further, in this embodiment, as shown in FIG. 5, the vertical height (H4) of the opening 21a of the duct 21 is about 1/2 with respect to the vertical height (H3) of the radiating fin 20a. Although it has a structure in which the lower half is opened, the cooling air W1 that has passed through the opening 21a of the duct 21 and is ejected toward the radiating fins 20a has a size that flows evenly throughout the radiating fins 20a. Good.

[Electronic Device Cooling Method] Next, the electronic device cooling method according to the first embodiment to which the present invention is applied will be described in detail with reference to FIGS. FIG. 6 is an exploded perspective view for explaining the flow of cooling air discharged from the fan in the electronic apparatus according to the first embodiment to which the present invention is applied. In the first embodiment, as shown in FIG. 6, when the fan 22 operates, cooling air is generated forward. 3 to 6, the subsequent flows of the cooling air discharged from the fan 22 are indicated by white arrows.
In the video camera 1 as an electronic apparatus according to the first embodiment to which the present invention is applied, as shown in FIG. 6, when the fan 22 operates, the outside air is passed through the opening 13a of the rear panel 13 via the filter 28 attached to the rear panel 13. W is introduced, and the cooling air discharged from the fan 22 flows into the duct 21 disposed between the fan 22 and the heat radiating fin 20a and is compressed inside the duct 21 to increase the pressure, thereby increasing the pressure. The cooling air is ejected from an opening 21 a provided in the lower part of the duct 21.

As shown in FIGS. 3, 4, and 6, the cooling air W <b> 1 ejected from the openings 21 a provided below the duct 21 toward the heat radiating fins 20 a is closed by the metal fittings 27 at the lower ends of the heat radiating fins 20 a. Therefore, it becomes a collision jet, hits the gap between the heat radiation fin 20a and the heat radiation fin 20a, and flows from below to above along the heat radiation fin 57a. As a result, the image sensor 19a, which is the main heat generating component arranged in close contact with the fin base of the radiator 20, is cooled.
In addition, as shown in FIG. 3, it is set as the structure which blocks the ceiling part with the wall above the duct 21 so that the cooling air W1 which flowed upward along the radiation fin 20a does not go to the fan 22 of the back.
Further, as shown in FIG. 3, the cooling air W <b> 1 that has flowed upward along the radiation fins 20 collides with the second circuit board 23 disposed at the upper part of the casing, and forwards the casing and in the lateral direction of the casing. And flows downward through the left and right sides of the casing while cooling the heat generating component 23a mounted on the second circuit board 23, and exhausts the side of the casing provided on the left and right sides of the casing and the bottom of the casing. It is discharged to the outside of the housing through the opening 16a and the housing bottom surface exhaust port 15a.

As shown in FIGS. 4 to 6, the pressure is increased inside the duct 21, and the cooling air blown out from the P portion (lattice portion) of the opening 21a of the duct 21 through the right outer side of the radiating fin 20a is The cooling air W2 and the cooling air W3 pass through the right outer side of the radiating fin 20a, and then collide with the first circuit board 19 and flow in the left direction as shown in FIGS. The heat sink 20 wraps around the fin base side, and further flows through the gap between the fin base and the first circuit board 19 to cool the heat generating component 19b of the first circuit board 19, and is provided on the left side of the housing. It is discharged to the outside of the housing from the housing side exhaust port 16a.
On the other hand, the cooling air W3 passes through the right side of the heat radiating fin 20a, and then collides with the first circuit board 19 and flows in the right direction as shown in FIGS. While cooling the heat generating component 24a of the third circuit board 24 disposed in front, the heat generating component 24a is discharged to the outside from the case side exhaust port 16a and the case bottom exhaust port 15a provided on the right side surface and the bottom surface of the case. .
Note that when the first circuit board 19 extends to a position that blocks the traveling direction of the cooling air W3, the cooling air flowing in the right direction among the cooling air W3 colliding with the first circuit board 19 is cooled. While the wind is further bent, the wind goes straight forward to cool the heat generating component 24a of the third circuit board 24. On the other hand, when the first circuit board 19 extends in a position that partially blocks the traveling direction of the cooling air W3, the cooling air that has traveled substantially straight forward without colliding with the first circuit board 19 Of the cooling air W3 that has partially collided, the cooling air that has flowed in the right direction and traveled straight forward and further straight forward cools the heat generating component 24a of the third circuit board 24.

As described above, according to the present invention, the fin base of the radiator is brought into close contact with the main heat generating component mounted on the circuit board, and the radiation fin from the front surface of the radiation fin provided on the opposite side of the fin base of the radiator. In an electronic device that cools main heat generating components by injecting cooling air toward the heat generating component, heat generating components other than the main heat generating component are mounted on the circuit board, and a part of the cooling air to the heat radiating fins collides with the circuit board. By guiding the cooling air to the upper surface space of the circuit board, it is possible to cool the heat generating components other than the main heat generating components while ensuring the necessary cooling performance of the main heat generating components. In addition, the cooling air is distributed to each of a plurality of heat generating parts having different temperatures required for normal operation so that the cooling air is distributed in an appropriate amount, thereby ensuring the necessary cooling performance of the main heat generating parts and the plurality of air generated inside the housing. It is possible to efficiently dissipate heat from the heat generating parts.

Other Embodiments Hereinafter, an electronic device according to another embodiment to which the present invention is applied will be described in detail.
An electronic device according to another embodiment to which the present invention is applied has, for example, the following characteristics with respect to the electronic device according to Embodiment 1 of the present invention. (1) The image sensor 19a may be in the arrangement relationship shown in the first embodiment, and may be configured to be mounted on other components without being mounted on the first circuit board 19. (2) The positional relationship between the radiating fin 20a, the opening 21a of the duct 21 and the fan 22 may be determined according to the positions of the plurality of heat-generating components, and is not limited to the arrangement of the first embodiment. (3) A Peltier element may be built in the imaging element 19a which is the main heat generating component, or a Peltier element may be sandwiched between the imaging element 19a and the radiator 20, and in this case, heat dissipation of the Peltier element It does not affect the effect.

As described above, according to the present invention, it is possible to cool a heat generating component other than the main heat generating component while ensuring the necessary cooling performance of the main heat generating component. In addition, in electronic devices equipped with multiple heat generating components that require different temperatures for normal operation, the cooling performance required for the main heat generating components is distributed by distributing the appropriate amount of cooling air to each of the multiple heat generating components. It is possible to efficiently dissipate heat from a plurality of heat generating components generated inside the housing while ensuring the above.

In short, the present invention is not limited to the above-described embodiments as they are, and can be embodied by modifying constituent elements without departing from the scope of the invention in the implementation stage. Moreover, various inventions can be formed by appropriately combining a plurality of constituent elements disclosed in the above embodiments. For example, some components may be deleted from all the components shown in each embodiment. Furthermore, you may combine suitably the component covering different embodiment.

In this embodiment, the electronic device to which the present invention is applied is described as a video camera. However, the present invention is not limited to a video camera, and includes a plurality of circuit boards each having a heat generating component mounted thereon. The present invention can be applied to any electronic device that is cooled by cooling air from the fan.

The present invention relates to an electronic device having a cooling structure. For example, the present invention is used in an electronic device on which a plurality of heat generating components are mounted, and it is necessary to efficiently dissipate heat from the plurality of heat generating components generated inside the housing. Suitable for various electronic devices.

1: video camera, 10: front panel, 11: substrate mounting bracket (3), 12: substrate mounting bracket (4), 13: rear panel, 13a: opening, 14: top frame, 15: housing bottom plate, 15a: Housing bottom exhaust port, 16: housing cover, 16a: housing side surface exhaust port, 17: support column, 18: lens unit, 19: first circuit board, 19a: imaging device, 19b: heat generating component, 20: heat dissipation 20a: radiating fin, 21: duct, 21a: opening, 22: fan, 23: second circuit board, 23a: heat generating component, 24: third circuit board, 24a: heat generating component, 25: fourth Circuit board, 26: board mounting bracket (2), 27: metal fitting, 28: filter, 50: front panel, 51: right side plate, 52: left side plate, 53: rear panel, 53a: opening, 54: housing bottom plate 55: Lens part 6: first circuit board, 56a: imaging device, 56b: electronic component, 57: radiator, 57a: radiator fin, 58: duct, 58a: opening, 59: fan, 60: chamber, 60a: opening, 60b: opening, 61: second circuit board, 61a: heat generating component, 62: third circuit board, 62a: heat generating component, 63: partition plate, 64: support, 100: video camera.

Claims

In an electronic device comprising: a radiator for cooling the first heat generating component in the apparatus composed of a radiation fin part and a fin base; and a blower part for generating cooling air to be sent to the radiation fin part.
A first flow path in which the cooling air from the blower flows toward the heat dissipating fin portion of the radiator and a collision jet is formed;
A second flow path in which a part of the cooling air from the blower part passes outside the radiator;
A cooling structure in which cooling air that has passed through the second flow path passes through the fin base side of the radiator and a third flow path is formed;
The first heat-generating component that is in contact with the fin base so as to conduct heat is cooled by cooling air flowing through the first flow path via the radiator,
2. The electronic device according to claim 1, wherein the second heat generating component mounted on the third flow path is cooled by cooling air flowing through the third flow path.
A circuit board is disposed at a position facing the fin base so that the cooling air of the second flow path is guided to the third flow path, and the third flow path includes the fin base and the fin base. The electronic device according to claim 1, wherein the electronic device is formed by a gap with the circuit board.
3. The electronic device according to claim 2, wherein the first heat generating component and the second heat generating component are mounted on the circuit board.
4. The electronic device according to claim 1, wherein the first heat generating component and the second heat generating component can be cooled to different temperatures.
5. The electronic device according to claim 1, wherein the first heat generating component has a larger heat generation amount than the second heat generating component.
The electronic device according to any one of claims 1 to 5, wherein the air blowing unit is installed eccentrically with respect to the radiator.
7. The electronic device according to claim 1, wherein the blower has an outer diameter larger than that of the radiator.
A duct part is disposed between the heat radiating fin part and the air blowing part, and the first flow path and the second flow path are formed by an opening provided in the duct part. The electronic device according to claim 1.
The radiator has a structure for closing a bottom surface of the radiation fin portion,
The cooling air from the air blower is caused to collide with the lower part of the radiating fin part from the opening provided below the duct part, and the cooling air flows from the lower part to the upper part through the gap of the radiating fin part. The electronic device according to claim 8.
10. The electronic device according to claim 1, wherein cooling air rises from the radiating fin portion to cool the third heat generating component disposed on the upper surface substrate.
Of the cooling air from the second flow path, a fourth flow path through which the cooling air that did not flow into the third flow path passes, and a fourth heat generating component is provided on the fourth flow path. The electronic device according to claim 1, further comprising: an electronic device according to claim 1;
A first circuit board on which a main heat generating component and a heat generating component other than the main heat generating component are mounted; a fin base in contact with the main heat generating component so as to conduct heat; A radiator having a radiating fin portion formed on the opposite side of the fin base, a blower for generating cooling air to be sent to the radiating fin portion, and being disposed between the radiating fin portion and the blower, A duct having an opening that forms a flow path of the cooling air that is sent from the blower to the heat radiating fin, and a heat generating component other than the main heat generating component is the main heat generating component and the fin base of the radiator. An electronic device mounted on the surface of the first circuit board that is in thermal conductivity contact with the circuit board,
The size of the opening of the duct is configured to protrude to one side from the radiating fin portion, while the first circuit board is arranged on one side of the radiating fin portion in the same direction as the opening of the duct. Configured to protrude into
The cooling air from the blower has passed through the opening of the duct and the first flow path that is jetted to the radiating fin, and the portion of the opening of the duct that protrudes. A part of the cooling air is divided and circulated into a second flow path that is jetted so as to pass outside the radiating fin portion,
After a part of the cooling air flowing through the second flow path collides with the first circuit board, it flows into the gap between the first circuit board and the fin base of the radiator and enters the main circuit board. An electronic device, wherein the electronic device is a third flow path for cooling a heat generating component other than the heat generating component.
13. The electronic apparatus according to claim 12, wherein the main heat generating component is an image sensor, and a heat generating component other than the main heat generating component includes a signal processing semiconductor element for taking out an electric signal from the image sensor.