JP2000056008A - Radar device for automobile - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a radar device for an automobile capable of efficiently radiating the heat generated from a control circuit controlling device operations including transmission/reception operations of radar waves. SOLUTION: The rear side of a device case 4 storing a control circuit 3 is formed with a metal case section 16. The metal case section 16 has a double structure of a first metal member 17 and a second metal member 18 on its rear side, and a ventilation passage 20 feeding wind in the vertical direction is formed between the first metal member 17 and the second metal member 18. The control circuit 3 is fitted to the first metal member 17. The heat generated from the control circuit 3 during device drive is transferred to the first metal member 17 then to the second metal member 18, and it is radiated from both the first metal member 17 and the second metal member 18. Wind is fed to the rear side of a device during the device drive (during the travel of an automobile), wind is also fed upward from below in the ventilation passage 20, and heat is efficiently radiated from the plate members 17, 18.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radar device mounted on an automobile for detecting an inter-vehicle distance.

[0002]

2. Description of the Related Art FIG. 9 is a perspective view showing an example of an automobile radar apparatus, and FIG. 10 is an exploded view of the automobile radar apparatus shown in FIG. As shown in FIGS. 9 and 10, the automotive radar apparatus 1 includes an antenna unit 2 for transmitting and receiving a radio wave as a radar wave, and a control circuit 3 for controlling the operation of the apparatus including the operation of transmitting and receiving radar waves.
Have a form accommodated in the device case 4.

The device case 4 includes a first metal case portion 5 forming a rear surface portion of the case 4, a second metal case portion 6 provided on the front side of the first metal case portion 5, and a second metal case portion 6. A resin case portion 7 provided on the front side of the metal case portion 6; a packing 8a interposed between the first metal case portion 5 and the second metal case portion 6; And a packing 8b interposed between the case 7 and the resin case 7 is screwed to the front side of the second metal case 6 via the packing 8b. The second metal case part 6 is screwed to the front side of the first metal case part 5 via the packing 8a, and the device case 4 is formed.

The antenna unit 2 and the control circuit 3 are attached to the inside of the device case 4 by using a support fitting 10 with the antenna unit 2 facing the front. The first metal case portion 5 has a hole 1 for leading a lead wire (not shown) electrically connected to the control circuit 3 to the outside of the device case 4.
1 is provided, and the control circuit 3 can be connected to an external circuit through the above-mentioned lead wire.

[0005] The radar apparatus 1 having the above-described configuration is attached to, for example, a bumper on the front side of an automobile, and transmits a radar wave from the antenna section 2 toward the front of the automobile by the control operation of the control circuit 3. When the transmitted radar wave hits a vehicle or the like in front, the radar wave is reflected and returns to the antenna unit 2. Therefore, the control circuit 3 determines based on the transmitted radar wave and the received radar wave. It is provided with a configuration capable of detecting the presence or absence of a forward vehicle, the inter-vehicle distance to the forward vehicle, and the like.

By the way, when the radar device 1 is driven to generate heat from the control circuit 3 (that is, while the automobile is running), the heat generated by the control circuit 3 is transferred to the first metal through the support fitting 10. The heat is transferred to the case part 5 and the second metal case part 6 and is radiated from the surfaces of the first metal case part 5 and the second metal case part 6. In the automotive radar device 1 shown in FIGS. 9 and 10, the heat dissipation efficiency was good because most of the device case 4 was formed of metal.

[0007]

However, the antenna unit 2
When the radar wave transmitted from the antenna unit 2 is a radio wave, if a part of the device case 4 in front of the antenna unit 2 is made of metal, a part of the radio wave transmitted from the antenna unit 2 The output gain is reduced by reflection from the metal of the device case 4, which causes a problem that the detection sensitivity of the device is reduced. Therefore, the antenna unit 2
In a radar device in which the radar wave transmitted from the radar device is a radio wave, only the rear side of the device case 4 is made of metal, and the other portion of the device case 4 is made of a dielectric material that easily transmits radio waves, and the detection sensitivity of the device is In most cases, it is configured to prevent a decrease in the temperature.

However, when the device case 4 is configured in such a manner, most of the device case 4 is made of a dielectric material having a poor thermal conductivity. 4, heat is radiated only at the metal portion on the rear side, and the heat radiation efficiency is degraded.

When the heat radiation efficiency is deteriorated, the heat generated from the control circuit 3 tends to be trapped inside the device case 4, so that the components such as the control circuit 3 must be constituted by components having high heat resistance. There is a problem that the price of the product increases. In order to solve such a problem, the detection sensitivity of the device can be prevented from lowering.
Moreover, there is a demand for a radar device having good heat radiation efficiency.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problem, and an object of the present invention is to provide an automotive radar device capable of efficiently radiating heat generated from a control circuit.

[0011]

Means for Solving the Problems In order to achieve the above object, the present invention has the following structure to solve the above problems. That is, a first aspect of the present invention is an automotive radar device including an antenna unit for transmitting and receiving radar waves, and a control circuit for controlling device operations including the above-mentioned radar wave transmitting and receiving operations is provided in the device case. The case includes a metal case on the rear side of the device case, the control circuit is mounted inside the metal case, and the metal case has a function of radiating heat generated from the control circuit. The rear surface portion of the metal case portion has a structure in which a first metal member and a second metal member behind the first metal member are stacked back and forth, and air flows between the first metal member and the second metal member. Means for solving the above-mentioned problem is a configuration in which a ventilation passage having an end opening is formed.

According to a second aspect of the present invention, there is provided the structure of the first aspect, wherein a guide portion for forcibly guiding the wind around the device flowing in the front-rear direction into the ventilation passage is provided at one end of the ventilation passage. A configuration that protrudes outside the opening of the part is a means for solving the above-mentioned problem.

According to a third aspect of the present invention, there is provided the configuration of the second aspect of the present invention, wherein the ventilation passage is configured to allow air to pass in a vertical direction, and a guide portion is provided at a lower end side of the ventilation passage. With this configuration, the wind around the device flowing in the front-rear direction is forcibly guided from the lower end side into the inside of the ventilation passage and blown out from the upper end side of the ventilation passage.

According to a fourth aspect of the present invention, the first, second, or third aspect is provided.
According to another aspect of the present invention, at least one of the first metal member and the second metal member has a configuration in which the inner side wall surface of the ventilation passage has an uneven shape.

In the invention having the above structure, the heat generated from the control circuit during the operation of the apparatus is transmitted to the first metal member of the metal case portion and further to the second metal member. The transferred heat is radiated from the external surfaces of the first metal member and the second metal member exposed to the outside. In addition, while the device is being driven, that is, while the vehicle is running, wind flows around the device in the front-rear direction, so that the surroundings of the device are in a negative pressure state. A wind in the direction is generated.
Heat is efficiently released from the inner side wall surfaces of the ventilation passages of the metal member and the second metal member.

According to the present invention, the metal case portion constituting the rear side of the device case has a structure in which a first metal member and a second metal member are stacked back and forth, and the first metal member and the second metal member. Since a ventilation passage is formed between them, the heat generated by the control circuit can be efficiently dissipated as compared with the case where the metal case portion forming the rear side of the device case is formed of a single plate member. The surface area of the metal capable of dissipating heat is remarkably increased, and furthermore, since the wind passes through the ventilation passage when the apparatus is driven, it is possible to release heat more efficiently, and the above-mentioned problem is solved. You.

[0017]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 (a) is a view of the characteristic case of the automotive radar device in the first embodiment viewed from the upper side, and FIG. 1 (b) is a diagram of FIG. FIG. 3A is a cross-sectional view of the AA part shown in FIG. In the description of the embodiment, the same reference numerals are given to the same components as those of the components of the automotive radar device shown in the conventional example, and the overlapping description of the common components is omitted.

This embodiment is characterized by a device case 4 for housing the antenna unit 2 and the control circuit 3, and as shown in FIGS. 1A and 1B, the device case 4 is 4 and a radome 15 provided on the front side of the metal case 16. Other configurations are almost the same as those of the conventional example.

A view of the radome 15 taken out and viewed from above is shown in FIG. 2 (a), and a cross section taken along line BB shown in FIG. 2 (a) is shown in FIG. 2 (b). . These figures 2
As shown in (a) and (b), the radome 15 is a box having a rear opening, and is made of a dielectric material such as resin. The rear side of the radome 15 is formed as an overhang portion 21 which protrudes from the radome main body portion 15a.
Holes 22 are formed on the upper side and the lower side of the overhang 21, respectively.

The metal case portion 16 is provided with a structure shown in FIG.
As shown in (b), the first metal member 17 and the second metal member 18 on the rear side thereof have a double structure in which the first metal member 17 and the second metal member 18 are stacked back and forth, and the first metal member 17 and the second metal member A gap is formed between the air passage 18 and the air passage 18, and the gap forms an air passage 20 having an end opening through which the wind passes vertically.
The first metal member 17 and the second metal member 18 are made of a metal material having good thermal conductivity, such as aluminum.

FIG. 3 (a) shows a state in which the first metal member 17 is extracted and viewed from above, together with a support portion 23 which will be described later. FIG. 3 (b) shows the state shown in FIG. 3 (a). C shown in
The cross section of -C portion is shown. These (a) of FIG.
As shown in FIG. 2B, the peripheral edge of the first metal member 17 is formed as a flange 25. The flange 25 extends over the entire circumference around the rear opening of the radome main body 15a shown in FIG. End 15b
The flange 25 is brought into contact with the rear opening peripheral end 15b of the radome main body 15a via a packing 26 as shown in FIG. The rear opening of the radome 15 can be closed by the first metal member 17.

As described above, the rear opening peripheral edge 1
By providing the packing 26 between the flange 5b and the flange 25, a gap between the rear opening peripheral end 15b and the flange 25 can be eliminated, and the inside of the radome 15 can be removed by the first metal member 17. It is possible to perform liquid-tight sealing, and it is possible to reliably prevent the occurrence of a water leakage problem in which water enters the inside of the radome 15 from a gap between the rear opening peripheral end portion 15b and the flange portion 25.

As shown in FIGS. 3A and 3B, the first
A portion of the metal member 17 excluding the flange portion 25 is formed as a concave portion 27 recessed toward the rear side, and a rear wall of the concave portion 27, that is, a portion forming an inner wall of the ventilation passage 20 is bent and formed. The inner side wall surface of the ventilation passage 20 is formed in an uneven shape.

At the left and right ends of the first metal member 17, support portions 2 for attaching the antenna portion 2, the control circuit 3 and the like are provided.
3 is formed to protrude forward. This support portion 23 is also the first
Similar to the metal member 17, it is made of a metal material such as aluminum having good thermal conductivity.

FIG. 4A shows a state where the second metal member 18 is extracted and viewed from above, and FIG. 4B shows a state where the second metal member 18 is viewed from behind. Have been. The rear surface of the second metal member 18 has an irregular shape, and has a protruding portion 28 protruding forward at a peripheral end thereof so as to cover the rear surface of the first metal member 17. Is formed. Further, mounting portions 30 for mounting the second metal member 18 to the radome 15 are provided on the upper side and the lower side of the second metal member 18, respectively. The mounting portion 30 has a claw portion 30a. Formed,
As shown in FIG. 1B, the second metal member 18 can be attached to the radome 15 by inserting the hook 30a into the hole 22 of the radome 15 and hooking the same.

In this embodiment, the first metal member 1
After the antenna 2 and the control circuit 3 are mounted on the support 7 using the support 23, the radome 1 is placed on the front side of the first metal member 17 so as to cover the antenna 2 and the control circuit 3.
5 and the rear opening peripheral end 15 of the radome main body 15a.
b, the flange 25 of the first metal member 17 is brought into contact with the first metal member 1
7, and in this state, the first metal member 1
7, the second metal member 18 is put on from the rear side, the claw 30 a of the second metal member 18 is hooked on the hole 22 of the radome 15, and the second metal member 18 is attached to the radome 15. In this manner, the automobile radar device 1 can be assembled. In this state, the first metal member 17 and the second metal member 1 are assembled.
The size of the hole portion 22 and the length of the attachment portion 30 of the second metal member 18 are designed and set so that the second metal member 8 can come into contact with the second metal member 18.
Is formed.

The automotive radar device 1 of this embodiment is configured as described above, and is attached to, for example, a front bumper of an automobile. Hereinafter, a characteristic heat radiation mechanism of the device in this embodiment will be briefly described with reference to a model diagram of FIG.

In a state where the automotive radar device 1 is driven and heat is generated from the control circuit 3, that is, while the vehicle is running, the heat generated by the control circuit 3 is transmitted to the first metal through the support 23. The heat is transmitted to the member 17 and further to the second metal member 18, the air inside the ventilation passage 20 is warmed by the heat of the first metal member 17 and the second metal member 18, and the air flows from the lower side to the upper side by the convection phenomenon. Try to flow towards. On the other hand, as shown in FIG. 5, since the wind around the device 1 flows in the front-rear direction, the surroundings of the device are in a negative pressure state. As a result, the wind flowing from the lower side to the upper side passes through the inside of the ventilation passage 20.

The heat transferred from the control circuit 3 to the first metal member 17 and the second metal member 18 is radiated from the rear surface of the second metal member 18 by the wind wrapping around the rear side of the device 1.
In addition, due to the wind passing through the ventilation passage 20,
The heat is radiated from the rear surface of the first metal member 17 and the front surface of the second metal member 18 forming the inner wall surface of the ventilation passage 20.

In this embodiment, the metal case portion 16 forming the rear side of the device case 4 has a double structure in which a first metal member 17 and a second metal member 18 are stacked back and forth.
Since a ventilation passage 20 through which air flows in the vertical direction is formed between the first metal member 17 and the second metal member 18, when the rear side of the device case 4 is constituted by a single metal plate member. In comparison, the surface area of the metal that comes into contact with the wind is remarkably increased, so that the heat generated from the control circuit 3 can be efficiently radiated. In this way, the heat generated by the control circuit 3 can be efficiently radiated, in other words, the device 1 can be effectively cooled (air-cooled). There is no need to configure the circuit 3 etc. with parts having excellent heat resistance,
It is possible to suppress an increase in the price of the automotive radar device 1.

The rear surface of the second metal member 18 is made uneven, and the first metal member 1 forming the ventilation passage 20 is further formed.
Since the inner side wall surface of the ventilation passage 20 is formed in a concave and convex shape by forming the bent portion 7, the surface area of the metal contacting the wind is further increased, and the heat of the control circuit 3 can be more efficiently radiated.

Further, since the portion of the device case 4 ahead of the antenna 2 (that is, the radome 15) is made of a dielectric material such as resin, a part of the radio wave transmitted from the antenna 2 is The problem of reflection at the device case 4 does not occur, and this can prevent the detection sensitivity of the automotive radar device 1 from lowering.

Further, as a method of efficiently dissipating the heat generated from the control circuit 3, it is conceivable to provide a fan for cooling the apparatus case 4 by air. In this case, the fan and its driving means are required. As a result, the structure of the apparatus becomes complicated, the size of the radar apparatus 1 increases, and the price of the radar apparatus 1 increases. On the contrary,
In this embodiment, the metal case 16 has a double structure including a first metal member 17 and a second metal member 18, and the ventilation passage 2 is provided between the first metal member 17 and the second metal member 18.
By simply forming 0, the above-described excellent heat radiation effect can be obtained, the structure is simple, and the metal case portion 16 is small (thin). 1 can be avoided, and the price increase can be suppressed.

Hereinafter, a second embodiment will be described. The feature of this embodiment different from the first embodiment is that, as shown in FIG.
A guide portion 32 for forcibly guiding the wind around the device flowing in the front-rear direction into the ventilation passage 20 is provided. The other configuration is the same as that of the first embodiment, Is omitted.

In this embodiment, as shown in FIG.
The lower end side of the second metal member 18 is the lower end opening 2 of the ventilation passage 20.
Projection is formed below (outside) 0b, and this projecting portion constitutes the guide portion 32, and the tip of the projecting portion is inclined toward the front side.

When the guide portion 32 is provided in this manner, as shown in the model diagram of FIG. 7, the air flowing below the device 1 flows along the guide portion 32 from the lower end opening 20b into the ventilation passage 20. And blows out from the upper end opening 20a, and the heat transmitted to the first metal member 17 and the second metal member 18 is radiated by the wind. Of course, the wind wrapping around the rear surface of the second metal member 18 causes
Heat is also radiated from the rear surface of the metal member 18.

According to this embodiment, since the guide portion 32 is provided in addition to the configuration of the first embodiment, the speed of the wind flowing through the ventilation passage 20 during driving of the apparatus is increased. As a result, the first metal member 17 and the second metal member 18
The heat radiation speed from the metal case portion 16 can be increased.
The heat radiation efficiency can be remarkably improved.

It should be noted that the present invention is not limited to the above embodiments, but can take various embodiments. For example, in each of the above embodiments, the first metal member 17 and the second
Although the ventilation passage 20 is formed between the metal members 18 so as to allow the wind to pass in the vertical direction, the ventilation passage 20 may be formed so that the wind in the left and right direction passes. In this case, the ventilation passage 2
Since the air inside 0 is unlikely to flow in the left-right direction due to the convection phenomenon, a guide portion as shown in the second embodiment is provided at one end of the ventilation passage 20, and this guide portion allows
It is desirable that the wind around the device flowing in the front-rear direction is forcibly guided into the ventilation passage 20 during the driving of the device, and the wind in the left-right direction is passed through the ventilation passage 20.

Further, in each of the above embodiments, the rear wall of the concave portion 27 of the first metal member 17 is formed to be bent in an uneven shape, and the inner wall surface of the ventilation passage 20 is formed in an uneven shape. Alternatively, the inner wall surface of the ventilation passage of the second metal member 18 may be formed in an uneven shape, and the inner wall surface of the ventilation passage 20 may be formed in an uneven shape, or the inner wall surface of the ventilation passage of the first metal member 17 and the second metal may be formed. Both the inner wall surface of the ventilation passage 20 and the inner wall surface of the ventilation passage 20 may have an uneven shape. Further, when the heat generated from the control circuit 3 can be radiated satisfactorily without forming the inner wall of the ventilation passage 20 in an uneven shape, such as when the amount of heat generated from the control circuit 3 is small, the first metal member Both the air passage inner wall surface 17 and the air passage inner wall surface of the second metal member 18 may be formed flat.

Furthermore, in each of the above embodiments, the second metal member 18 was attached to the radome 15.
As shown in (2), the second metal member 18 may be attached to the first metal member 17 by the connecting member 33. Of course, in this case, the connecting member 33 is made of a metal material having good heat conductivity, and the heat generated from the control circuit 3 is transferred to the second metal member via the first metal member 17 and the connecting member 33.
The heat is transferred to the metal member 18. Further, in each of the above-described embodiments, the second metal member 18 is formed so as to cover the rear surface of the first metal member 17 with the protrusion 28 protruding forward at the peripheral end thereof. As shown in FIG. 8, the second metal member 18 may be formed flat.

Further, in each of the above embodiments, the metal case 16 constituting the rear portion of the device case 4 has a double structure in which the first metal member 17 and the second metal member 18 are stacked back and forth. A metal plate member may be further provided on the rear side of the second metal member 18, and the metal case portion 16 may have a triple structure, or may have a quadruple or more structure. Also in such a case, a ventilation passage through which the wind passes between the plate members is provided, and by having such a configuration, the heat radiation efficiency can be further improved.

Further, in the second embodiment, the guide portion 32 is provided at the lower end of the ventilation passage 20 through which air flows in the vertical direction. However, the guide portion is provided at the upper end of the ventilation passage 20. The wind around the device flowing in the front-rear direction may be forcibly guided into the passage 20 from the upper end side of the ventilation passage 20 along the guide portion, and may be blown out from the lower end side of the passage 20. In this case, the same effects as those of the second embodiment can be obtained.

Further, in each of the above embodiments, the metal case 16 has a double structure in which the first metal member 17 and the second metal member 18 are superposed one on the other. However, as an application example of the present invention, For example, the metal case portion 16 may be formed of a single metal plate member, and the metal plate member may be provided with one or more through holes as ventilation passages through which the wind passes. Can play. of course,
Also in this case, a guide portion for forcibly guiding the wind around the device to the inside of the through hole may be provided at one end side of the through hole. May be formed.

Further, in each of the above embodiments, a radar apparatus having a configuration for transmitting and receiving a radio wave as a radar wave has been described as an example. However, the present invention is, of course, applicable to an automotive radar apparatus for transmitting and receiving a laser as a radar wave. Can be applied.

[0046]

According to the present invention, the rear side of the device case is constituted by the metal case portion, and the control circuit is mounted inside the metal case portion.
Since the metal member and the second metal member have a structure in which the metal member and the second metal member are stacked back and forth, and between the first metal member and the second metal member, a ventilation passage having an end opening through which air flows is formed. During traveling of the automobile, heat generated from the control circuit is transferred to the first metal member, further transferred to the second metal member, and transferred to the first metal member and the second metal member. The heat is radiated from the first metal member and the second metal member by the wind wrapping around the rear side of the device case and the wind passing through the ventilation passage, and the metal case portion is formed by one metal plate member. As compared with the case where the configuration is made, the metal surface area in contact with the wind is increased, and the heat radiation efficiency can be remarkably improved.

As described above, since the heat generated by the control circuit can be efficiently dissipated, it is not necessary to configure the control circuit and the like housed inside the device case with components having high heat resistance. An increase in the price of the device can be suppressed.

In addition, since an excellent heat radiation effect can be obtained with a simple structure as described above without using a large device such as a cooling fan for air-cooling the device case, the size of the radar device for an automobile is increased. Can be prevented.

Further, when the radar wave is a radio wave, even if the front side of the device case is made of a resin or the like which does not adversely affect the radio wave, in other words, the device case portion made of metal is the rear side. Even with only the above, the excellent heat radiation effect as described above can be obtained, so that it is possible to prevent the detection sensitivity of the device from lowering and to provide an automotive radar device with good heat radiation efficiency. .

In the case where a guide portion for forcibly guiding the wind around the device flowing in the front-rear direction into the ventilation passage at one end of the ventilation passage is provided, the wind forcedly guided to the ventilation passage by the guide portion is provided. Accordingly, the speed of the wind passing through the ventilation passage is increased, the heat radiation speed of the first metal member and the second metal member constituting the inner wall of the ventilation passage is increased, and the heat radiation efficiency can be further improved.

The ventilation passage has a structure in which air is passed vertically, and the guide portion is provided at the lower end of the ventilation passage. The air inside the ventilation passage heated by the heat of the control circuit is not provided. Since the air flows from the upper side to the lower side, the flow of the air and the flow of the wind guided by the guide portion can be smoothly passed through the ventilation passage, and an excellent heat radiation effect can be obtained. Can be played.

When at least one of the first metal member and the second metal member has a ventilation passage inner side wall having an uneven shape, the surface area of the metal exposed to the wind can be increased.
Thereby, the heat radiation efficiency can be further improved.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing an automotive radar device according to a first embodiment;

FIG. 2 is an explanatory view showing a radome constituting the automotive radar device of FIG. 1;

FIG. 3 is an explanatory view showing a first metal member of a metal case part constituting the automotive radar device of FIG. 1 together with a support part.

FIG. 4 is an explanatory view showing a second metal member of a metal case part constituting the automotive radar device of FIG. 1;

FIG. 5 is an explanatory diagram schematically showing a flow of wind in a ventilation passage in the first embodiment.

FIG. 6 is a sectional view showing a characteristic device case in the second embodiment.

FIG. 7 is an explanatory diagram schematically showing a flow of wind in a ventilation passage in a second embodiment.

FIG. 8 is an explanatory diagram showing another embodiment.

FIG. 9 is an explanatory diagram showing a conventional example.

FIG. 10 is an exploded view of the automotive radar device of FIG. 9;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Automotive radar apparatus 2 Antenna part 3 Control circuit 4 Device case 15 Radome 16 Metal case part 17 First metal member 18 Second metal member 20 Ventilation passage 32 Guide part

Continued on the front page F term (reference) 5J070 AC02 AD20 AE01 AF03 AK40 BF02 BF10 5J084 AA02 AA05 AB01 AC02 AD01 BA60 DA05 EA40

Claims (4)

[Claims] 1. An automotive radar apparatus comprising an antenna unit for transmitting and receiving radar waves and a control circuit for controlling operation of the apparatus including the transmitting and receiving operations of the radar waves provided in the apparatus case. The rear side of the device case is constituted by a metal case portion, the control circuit is mounted inside the metal case portion, and the metal case portion has a function of radiating heat generated from the control circuit. The rear surface has a structure in which a first metal member and a second metal member behind the first metal member are stacked back and forth,
An automotive radar device, wherein an air passage having an end opening through which air flows is formed between the first metal member and the second metal member. 2. A guide portion for forcibly guiding the wind around the apparatus flowing in the front-rear direction into the ventilation passage is formed at one end of the ventilation passage so as to protrude outward from an end opening of the ventilation passage. The automotive radar device according to claim 1, wherein 3. The ventilation passage has a configuration in which air flows vertically, and a guide portion is provided at a lower end side of the ventilation passage. 3. The automotive radar device according to claim 2, wherein the vehicle is guided from the side to the inside of the ventilation passage and blows out from the upper end side of the ventilation passage. 4. The automotive radar according to claim 1, wherein at least one of the first metal member and the second metal member has a ventilation passage inner side wall surface having an uneven shape. apparatus.