JP2023107658A - Electronic device and mobile body - Google Patents

Abstract

To provide an electronic device installed on a mobile body that can efficiently dissipate heat generated inside the device.SOLUTION: The electronic device mounted on a mobile body includes a heat conductive portion that conducts heat generated inside the electronic device to the outside of the electronic device. The electronic device is configured to conduct heat from the heat-conductive portion to a heat-dissipating unit installed on the mobile body.SELECTED DRAWING: Figure 3

Description

TECHNICAL FIELD The present invention relates to an electronic device mounted on a mobile object and the mobile object.

With respect to autonomous driving of automobiles, power consumption is increasing as the performance of in-vehicle rangefinders increases, and there is a need to efficiently dissipate the generated heat. The air heated by the electronic equipment was forcibly discharged outside the equipment. Patent Literature 1 describes a method of dissipating heat by passing a cooling medium from the outside through the housing wall of a small video camera and circulating the medium.

JP 2010-283673 A

However, when arranging electronic equipment in a closed space of a mobile object such as an automobile, simply passing the cooling medium from the outside through the housing wall of the electronic equipment and circulating it will cause the temperature of the closed space to rise and the electronic There is a problem that the temperature of the equipment rises. Moreover, when the electronic device is placed in the same space as the passenger of the mobile object, there is also a problem that the discharged air makes the passenger feel uncomfortable.

Furthermore, there is also the problem that the use of an air-cooling fan results in an increase in size and cost. Moreover, in Patent Document 1, a cooling mechanism and a circulation mechanism for circulating a cooling medium are required outside the video camera, which hinders miniaturization.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide an electronic device that is mounted on a mobile body and that can efficiently dissipate heat generated inside the electronic device.

In order to achieve the above object, the present invention
An electronic device mounted on a mobile body,
a heat conducting part for conducting heat generated inside the electronic device to the outside of the electronic device;
It is characterized in that the heat of the heat conducting portion is conducted to a heat radiating unit provided on the moving body.

Advantageous Effects of Invention According to the present invention, it is possible to provide an electronic device that is mounted on a mobile body and that can efficiently dissipate heat generated inside the electronic device.

1 is a diagram schematically showing a vehicle 1000 according to Embodiment 1; FIG. FIG. 2 is an exploded perspective view showing the structure of peripheral members of the front range finder 100 according to Embodiment 1; 2 is an exploded perspective view of a section around the front range finder 100 according to Embodiment 1. FIG. 2 is a schematic cross-sectional view showing the internal structure of the front range finder 100 according to Embodiment 1. FIG. 2 is a cross-sectional view parallel to the YZ plane around the front range finder 100 according to Embodiment 1. FIG. FIG. 10 is a diagram schematically showing a vehicle, which is a moving body having the configuration of Embodiment 2; FIG. 11 is a diagram schematically showing a state in which the bonnet portion 70 is opened according to the second embodiment; FIG. 10 is a diagram showing a cross section parallel to the YZ plane around the front range finder 100 in Embodiment 2;

Embodiments of the present invention will be described below with reference to the drawings. However, the present invention is not limited to the following embodiments. In each figure, the same members or elements are denoted by the same reference numerals, and overlapping descriptions are omitted or simplified.

[Embodiment 1]
Embodiment 1 will be described below. FIG. 1 is a diagram schematically showing a vehicle 1000 according to the first embodiment, FIG. 2 is an exploded perspective view showing the structure of peripheral members of the front range finder 100 according to the first embodiment, and FIG. 3 is the first embodiment. 2 is an exploded perspective view of a section around the front range finder 100. FIG. Parts and shapes that are less relevant to the description of the present embodiment are simplified or omitted.

As shown in FIG. 1, the forward direction in the traveling direction of a vehicle 1000 as a mobile object is the +Z direction, the vertical direction away from the ground as the height direction is the +Y direction, and the left direction when facing the traveling direction is the +X direction. For convenience of explanation, the +Z direction is sometimes described as forward, the −Z direction is backward, the +Y direction is upward, and the −Y direction is downward.

A vehicle 1000 is a so-called automobile that can be driven by a passenger and moved to any place.
The vehicle 1000 mainly includes a windshield 20, an upper exterior member 10, a door portion 30, a frame member 40, and the like. Windshield 20 is arranged in front of vehicle 1000 and is a window member made of a transparent material such as glass. Top surface exterior member 10 is made of metal and is an exterior member that forms part of the top surface exterior of vehicle 1000 .

The door portion 30 is a door that can be opened and closed when a passenger gets in and out of the vehicle. Frame member 40 is an outer shell member forming the main outer shell of vehicle 1000 . A boarding space for a passenger to ride is formed inside the frame member 40 . In the first embodiment, the inside of the vehicle is defined as the boarding space, and the outside of the vehicle 1000 is defined as the outside of the vehicle.

A forward ranging device 100 for measuring the distances of various objects in the forward direction is mounted (arranged) in the vehicle 1000 in the upper part near the windshield 20 . Note that the front range finder 100 according to the first embodiment includes an optical section for forming an optical subject image, an imaging section for photoelectrically converting the subject image into an electrical image signal, and the image signal It is composed of a calculation unit and the like that calculates the distance to the subject based on . Further, the upper surface exterior member 10 of the vehicle 1000 is formed with a convex shape 10a projecting upward.

In FIG. 2, the windshield 20 is not shown. The interior member 50 is attached to the inner surface of the frame member 40 and is a decorative member for preventing the frame member 40 from being exposed. The case member 60 is a protective member for holding and protecting the front range finder 100 and is fixed to the interior member 50 .

A case member 60 is attached to the interior member 50 while holding the front range finder 100 . A convex shape 10a is provided on the upper surface exterior member 10, and the convex shape 10a is formed into a shape protruding upward by drawing, for example. An opening 13, which is a through hole, is formed in the front portion of the convex shape 10a by incorporating a decorative member 12, which will be described later. Furthermore, an opening 14, which is a through hole, is also provided on the upper surface side of the convex shape 10a.

The decorative member 12 is a protective member arranged on the end surface and the inner surface side of the convex shape 10a to hide the sheet metal end surface of the convex shape 10a, and forms openings 13 and 14 . Here, a ventilation portion is formed by an air flow path from the opening 13 to the opening 14, the opening 13 functions as an opening for taking in air, and the opening 14 functions as an outlet for discharging the air. are doing.

A recessed shape 40a is formed in the frame member 40, and the recessed shape 40a is formed into a shape recessed downward by drawing, for example. Inside the concave shape 40a, an opening 40b, which is a hole penetrating the vehicle interior and the vehicle exterior, is provided, and a heat radiation unit 42 having heat radiation fins 42a and a heat insulating member 43 are arranged. The interior member 50 is formed with a recessed shape 50a that is recessed downward at a position corresponding to the recessed shape 40a of the frame member 40, and is further provided with an opening 50b that is a hole penetrating between the vehicle interior and the vehicle exterior. there is

In FIG. 3, a heat radiation unit 42 is a heat radiation member for promoting heat radiation from a predetermined portion, and is attached so as to penetrate through the opening 40b of the frame member 40. As shown in FIG. In order to increase the surface area of the heat dissipation unit, a plurality of so-called heat dissipation fins 42a in the form of thin plates are provided. and substantially parallel to the YZ plane consisting of the Y-axis perpendicular to the ground. That is, the plurality of fins are arranged along the ventilation direction of the ventilation section.

The heat insulating member 43 is made of a material with low thermal conductivity, is arranged so as to surround the heat radiating unit, and is arranged between the heat radiating unit and the opening 40b provided in the frame member 40, which is the wall surface of the ventilation section. ing. A heat-receiving surface 42b is provided at the lower portion of the heat-dissipating unit as a surface for receiving heat.

Further, the upper surface of the front range finder 100 is provided with a heat dissipation surface 101 as a heat conduction part for conducting heat generated inside to the outside of the electronic device. It is held by the case member 60 from the bottom side. The heat-conducting sheet 110 is a heat-conducting member for exchanging heat between devices with varying intervals, and is composed of an elastic body having high heat conductivity in the thickness direction. The thermally conductive sheet 110 is arranged between the heat radiating surface 101 and the heat receiving surface 42b of the heat radiating unit so as to be in close contact with each other. there is

Next, the internal configuration of the front range finder 100 will be described.
FIG. 4 is a schematic cross-sectional view showing the internal structure of the forward ranging device 100 according to the first embodiment.
Inside the front range finder 100, a lens barrel section 102, an imaging section 103, an imaging substrate 104, and a graphite sheet 105 are mainly provided. The lens barrel unit 102 is an optical member that has a lens group (not shown) and forms a subject image on the light receiving surface of the imaging unit 103 from external light. The imaging unit 103 is an imaging device such as a CMOS image sensor, and converts the subject image into an electric signal.

Note that the forward ranging device 100 as an electronic device detects the distance by detecting the phase difference between two imaging signals with different pupil positions obtained from one imaging element having functions such as DAF (Dual Pixel Auto Focus). may be used to measure Alternatively, the distance may be measured by a stereo camera composed of at least two imaging elements. Alternatively, the distance may be measured based on the contrast peak of the imaging signal obtained from one imaging element. Alternatively, TOF (Time Of Flight) or Lidar (Laser Imaging Detection and Ranging) may be used.

The imaging board 104 is an electronic circuit board having an arithmetic element for calculating distance information based on the electrical signal output from the imaging unit 103 . The imaging unit 103 has, for example, millions of photoelectric conversion units (pixels), and each pixel has a plurality of transistors. Since these pixels must be driven at high speed, the imaging unit 103 generates a lot of heat. Also, in the imaging board 104, a large amount of heat is similarly generated by driving the arithmetic elements.

The graphite sheet 105 is a sheet-like thermally conductive member made of a material with high thermal conductivity. ing. That is, the graphite sheet 105 has a function of conducting heat from the imaging substrate 104 to the heat dissipation surface 101 .
Next, the heat dissipation action in Embodiment 1 will be described.

FIG. 5 is a cross-sectional view parallel to the YZ plane around the front range finder 100 according to Embodiment 1. Two solid line arrows indicate the flow of outside air when the front range finder 100 travels, and two dashed line arrows indicate the flow of outside air. Arrows indicate the conduction of heat generated inside the forward ranging device 100 . As shown in the figure, in the front range finder 100 arranged in the upper part of the vehicle, the heat generated by the imaging unit 103, CPU, etc. is conducted to the heat radiation surface 101 via the imaging substrate 104 and the graphite sheet 105. FIG. The heat conducted to the heat dissipating surface 101 is further conducted to the heat receiving surface 42b of the heat dissipating unit via the thermally conductive sheet 110, which is an elastic body, and further to the heat dissipating fins 42a.

As described above, the plate surfaces of the thin plate-shaped fins of the heat radiating fins 42a are arranged so as to be substantially parallel to the YZ plane defined by the traveling direction Z-axis of the vehicle 1000 and the direction Y-axis perpendicular to the ground. Therefore, when the vehicle 1000 is running, the outside air flows into the convex shape 10a from the opening 13 as indicated by the solid line arrow in FIG. leak. That is, since the heat dissipation unit is arranged inside the ventilation portion extending from the opening 13 to the opening 14, the heat transferred to the heat dissipation fins 42a is radiated to the outside air from the heat dissipation fins 42a.

Although the through hole under the opening 14 is oriented in the Y direction in FIG. 5, the through hole may be slanted toward the rear in order to smoothen the flow of outside air. In this way, in the radiation fins 42a, the plurality of fins are attached substantially parallel to the YZ plane, so that when the vehicle 1000 travels, the outside air flows along the surfaces of the plurality of fins. Therefore, it is possible to efficiently dissipate the heat of the imaging unit and the like that has been transmitted to the surface of each fin to the outside air.

Further, in the first embodiment, the front range finder 100 is installed inside the vehicle. It is possible to effectively dissipate heat to the outside air. Furthermore, the heat transmitted from the upper exterior member 10 to the frame member 40 due to sunlight or the like is prevented from being transmitted to the heat radiating unit or the like by the heat insulating member 43 . Furthermore, since the convex shape 10a of the upper surface exterior member 10 is formed on the upper part of the heat dissipation unit, the heat dissipation unit is shielded from direct sunlight by a part of the moving body, and the temperature of the heat dissipation unit does not rise due to the direct sunlight. It is made not to.

Further, in the first embodiment, the front range finder 100 is attached to the interior member 50 in a substantially sealed state covered by the case member 60, thus forming a sealed structure. Therefore, a high heat radiation effect can be obtained by the heat radiation unit due to the air taken in from the outside, and dirt, dust, etc. are less likely to adhere to the front range finder 100, and deterioration of measurement performance can be prevented. It should be noted that "sealing" in the embodiment means that the airflow passing through the ventilation section is blocked (sealed) from the airflow so that dust and the like in the air passing through the ventilation section do not enter.

Further, in the first embodiment, the heat radiation unit is held by the frame member 40 (first structure), and the front range finder 100 is covered and held by the case member 60 (second structure). It's becoming In other words, the heat radiation unit is not held by the front range finder 100, but the heat of the front range finder 100 held by the case member 60 is transferred to the heat dissipation unit held by the frame member 40. and That is, the heat dissipation unit and the front range finder 100 are configured to be separable. Therefore, the frame member 40, the heat insulation member 43, and the heat radiation unit can be installed separately from the front range finder 100 as one exterior member.

Therefore, even when correcting the position of the front range finder 100 or maintaining it, it is possible to perform work only on the front range finder 100 without modifying the housing structure that forms the interior of the vehicle. It should be noted that the heat radiation effect can be obtained even if the structure is directly attached to the interior member 50 or the frame member 40 . Further, unlike the first embodiment, even if the front range finder 100 and the heat dissipation unit are integrally configured, a sufficient heat dissipation effect to the outside air can be obtained.

Further, in Embodiment 1, a sheet material using graphite or the like is used for heat conduction, but the sheet material is not limited to this, and a sheet material using silicon may be used. Alternatively, a heat pipe or the like may be used. Further, in Embodiment 1, examples of a distance measuring device, a CPU, and the like are described as on-vehicle electronic devices, but Embodiment 1 is not limited to these, and any electronic devices that generate heat when operated (electronic (including parts).

[Embodiment 2]
In the first embodiment, an example of arranging the electronic device in the upper part of the vehicle has been described. In addition, in Embodiment 2, the same code|symbol is used about the component demonstrated in Embodiment 1, and the same purpose and shape, and description is abbreviate|omitted.

FIG. 6 is a diagram schematically showing a vehicle, which is a moving object having the configuration of the second embodiment. Vehicle 2000 is an automobile similar to vehicle 1000 . A front portion of the vehicle 2000 is provided with a hood portion 70 made of metal or the like that can be opened and closed for maintenance inside the vehicle. The bonnet portion 70 is formed with a convex shape 70a. It is formed into a shape protruding upward by drawing.

A decorative member 73, which will be described later, is incorporated in the front portion of the convex shape 70a, and the decorative member 73 is formed with an opening 71 for a through hole that communicates with the inside of the bonnet portion 70. As shown in FIG. Further, an opening 72 communicating with the through hole is also formed on the upper surface of the convex shape 70a. The decorative member 73 is a protective member arranged on the end surface and the inner surface side of the convex shape 70 a to hide the sheet metal end surface of the convex shape 70 a, and forms the openings 71 and 72 .

FIG. 7 is a diagram schematically showing a state in which the bonnet portion 70 is opened according to the second embodiment. In the figure, a front space 80 is a space used for a motor, an engine, etc. arranged below the bonnet portion 70 and a luggage compartment. The front range finder 100 is arranged and held in a holding portion (not shown) provided in the front space 80 while being covered with the case portion 90 .

FIG. 8 is a diagram showing a section parallel to the YZ plane around the front range finder 100 according to the second embodiment. In the figure, a case portion 90 is composed of an upper case member 91 and a lower case member 92, forming a substantially closed box-like structure. That is, the front range finder 100 has a structure that is cut off from the draft of the ventilation section, and is constructed so that dust, dirt, and the like are less likely to adhere to the front range finder 100 and the range finder performance is not degraded.
The forward ranging device 100 is arranged inside the case portion 90 . A window portion 95 made of a transparent member is formed in the upper case member 91 , and distance measurement of the front range finder 100 is enabled by subject light incident through the window portion 95 .

A heat radiation unit made of metal is fixed to the upper case member 91 . The arrangement of the radiation fins is the same as in the first embodiment described above. A heat insulating member 43 is sandwiched between the heat radiating unit and the upper case member 91 so as to surround the heat radiating unit. Therefore, the heat dissipation unit does not come into direct contact with the upper case member 91 or the inner wall of the ventilation section. The heat insulating member 106 is made of a material having a low thermal conductivity, and is arranged and held between the front range finder 100 and the lower case member 92 . The lower case member 92 is fixed to a holding member (not shown) arranged in the front space 80 .

This prevents heat generated in the front space 80 from being conducted from the front range finder 100 and the holding portion of the lower case member 92 to the front range finder 100 . The heat pipe 96 is a heat conducting member such as a so-called heat pipe that utilizes the latent heat of liquid, and has one end on the heat radiation surface 101 provided on the upper surface side of the forward rangefinder 100 and the other end on the lower surface side of the heat dissipation unit. It is brought into contact with the heat receiving surface 42b. In other words, the heat generated inside the front range finder 100 is conducted from the heat radiation surface 101 to the heat radiation unit 42 via the heat pipe 96 and radiated.

Next, the heat dissipation action in the second embodiment will be described.
8 indicate the flow of outside air when the vehicle 2000 is running, and the broken arrows indicate the conduction of heat generated inside the front range finder 100. As shown in FIG. As described above, the heat generated inside the front range finder 100 is conducted to the heat radiation surface 101, to the heat receiving surface 42b of the heat radiation unit via the heat pipe 96, and further to the radiation fins 42a.

As described above, the plate surface of the thin fins of the radiating fins 42a is mounted substantially parallel to the YZ plane formed by the traveling direction Z-axis of the vehicle 2000 and the Y-axis perpendicular to the ground. Therefore, when the vehicle 1000 is running, outside air flows into the convex shape 70a from the opening 71 as indicated by arrows in the figure, flows between the plurality of fins of the radiation fins 42a, and flows out of the convex shape 10a from the opening 72.

Therefore, the heat transferred to the radiation fins 42a is efficiently radiated from the radiation fins 42a to the outside air. In this way, in the heat dissipation unit, since the plurality of fins are attached substantially parallel to the YZ plane, when the vehicle 1000 travels, the outside air flows along the surfaces of the plurality of fins, and the air flows to the surfaces of the fins. It is possible to efficiently dissipate the transmitted heat to the outside air.

Also, the heat generated by sunlight, an engine (not shown) in the front space 80, and the like and transmitted to the upper case member 91 is less likely to be conducted to the heat dissipation unit by the heat insulating member 43. FIG. In addition, since the convex shape 70a of the bonnet portion 70 is formed on the upper part of the heat dissipation unit, it is possible to block sunlight, and it is possible to reduce heating of the heat dissipation unit by direct sunlight. .

In the second embodiment, the opening 72 is provided in the convex shape 70a as an outflow path for outside air when the vehicle 2000 is running. In the case of ejection, there is no need to set the opening 72 .
Although the through hole under the opening 72 is oriented in the Y direction in FIG. 8, the through hole may be slanted toward the rear in order to smoothen the flow of outside air.

Further, in the second embodiment, the front range finder 100 is arranged near the center of the front space 80 as shown in FIG. 8, but this is not the only option. In that case, the opening for passing outside air may be provided in an exterior member forming the front portion of the vehicle 2000 instead of the bonnet portion 70 . Furthermore, the forward range finder 100 may be placed anywhere on the vehicle 2000, and similar effects can be obtained by including the configuration of the above embodiment or a part thereof.

Alternatively, air may be taken in through a pipe or the like from an air intake port of a cooling radiator for cooling an automobile engine, battery, inverter, motor, etc., and supplied to the heat dissipation unit 42 .
Further, in the above-described embodiments, an automobile is used as an example of a moving object. However, the mobile body is not limited to automobiles, and may be any mobile device such as motorcycles, bicycles, wheelchairs, ships, airplanes, robots, and drones.

Although the present invention has been described in detail based on its preferred embodiments, the present invention is not limited to the above embodiments, and various modifications are possible based on the gist of the present invention. They are not excluded from the scope of the invention.

10: Upper surface exterior member 10a: Convex shape 12: Decorative member 13: Opening 14: Opening 20: Windshield 30: Door portion 40: Frame member 40a: Concave shape 40b: Opening 42: Radiation unit 42a: Radiation fin 42b: Heat Receiving Surface 43: Heat Insulating Member 50: Interior Member 50a: Concave 50b: Opening 60: Case Member 70: Bonnet 70a: Convex 71: Opening 72: Opening 73: Decorative Member 80: Front Space 90: Case 91 : upper case member 92: lower case member 95: window portion 96: heat pipe 100: front rangefinder 101: heat dissipation surface 102: lens barrel portion 103: imaging portion 104: imaging substrate 105: graphite sheet 106: heat insulating member 110 : Thermal conductive sheet 1000: Vehicle 2000: Vehicle

Claims (21)

An electronic device mounted on a mobile body,
a heat conducting part for conducting heat generated inside the electronic device to the outside of the electronic device;
An electronic device, wherein the heat of the heat conducting portion is conducted to a heat dissipation unit provided on the moving body. 2. The electronic device according to claim 1, wherein the moving body has a ventilation section, and the heat dissipation unit is arranged inside the ventilation section. 3. The electronic device according to claim 2, wherein the heat dissipation unit has a plurality of fins. 4. The electronic device according to claim 3, wherein the plurality of fins are arranged along the ventilation direction of the ventilation section. 5. The electronic device according to claim 2, wherein a heat insulating member is arranged between the heat radiating unit and the wall surface of the ventilation section. 5. The electronic device according to claim 2, wherein the heat dissipation unit is shielded from direct sunlight by a portion of the moving body. The heat dissipation unit is held by a first structure of the moving body,
The electronic device according to any one of claims 1 to 6, wherein the electronic device is held by a second structure different from the first structure. The electronic device according to any one of claims 1 to 7, wherein an elastic body having high thermal conductivity is arranged between the heat dissipation unit and the heat conducting portion. The electronic device according to any one of claims 1 to 8, wherein the electronic device includes a distance measuring device for measuring distance. The electronic device according to any one of claims 1 to 9, wherein the electronic device has a structure that is shielded from the draft of the ventilation section. A mobile body equipped with an electronic device,
a heat conducting part for conducting heat generated inside the electronic device to the outside of the electronic device;
A moving object, wherein the heat conducting part is connected to a heat radiating unit provided on the moving object so as to conduct the heat of the heat conducting part. 12. The moving body according to claim 11, wherein the moving body has a ventilation section, and the heat dissipation unit is arranged inside the ventilation section. 13. The moving body according to claim 12, wherein the ventilation part has an opening for taking in air and an outlet for discharging air. 14. The moving body according to claim 12, wherein the heat dissipation unit has a plurality of fins. 15. The moving body according to claim 14, wherein the plurality of fins are arranged along the ventilation direction of the ventilation section. 16. The moving body according to any one of claims 12 to 15, wherein a heat insulating member is arranged between the heat radiating unit and the wall surface of the ventilation section. The moving body according to any one of claims 11 to 16, wherein the heat dissipation unit is shielded from direct sunlight by part of the moving body. The heat dissipation unit is held by a first structure of the moving body,
18. The moving body according to any one of claims 11 to 17, wherein said electronic device is held by a second structure different from said first structure. 19. The moving body according to any one of claims 11 to 18, characterized in that an elastic body with high thermal conductivity is arranged between said heat radiating unit and said heat conducting section. 20. The moving body according to any one of claims 11 to 19, wherein said electronic device includes a distance measuring device for measuring distance. 21. The moving body according to any one of claims 12 to 20, wherein the electronic device has a structure that is shielded from the draft of the ventilation section.

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