JP7152510B2 - radar equipment - Google Patents

Description

The present invention relates to radar equipment.

In recent years, radar devices for detecting obstacles around a vehicle have been developed as a basic technology for automatic driving and the like. As this type of radar device, there is known one in which a horn is installed on a substrate on which a patch antenna (antenna) is formed (see, for example, Patent Document 1). In the horn described in Patent Document 1, a waveguide is formed corresponding to the patch antenna on the substrate. The waveguide of the horn is formed so that the opening diameter widens as the distance from the substrate increases, and the waveguide radiates radio waves emitted from the patch antenna with directivity, thereby enhancing the detection sensitivity of obstacles.

WO2008/120826

However, in the radar device as described above, if the entire horn is made of metal, the weight of the device increases. On the other hand, if the horn is made of lightweight resin, there is a problem that radio waves pass through the horn and the directivity and strength of the radio waves are weakened.

SUMMARY OF THE INVENTION The object of the present invention is to provide a radar device capable of improving the directivity and strength of radio waves without increasing the weight of the device.

A radar device according to one aspect of the present invention includes a substrate provided with an antenna on one main surface, and a resin horn arranged on one main surface of the substrate, the radar device comprising: In the horn, a waveguide was formed at a position corresponding to the antenna, the waveguide becoming wider with increasing distance from one main surface of the substrate, and a shield layer made of a metal film was formed on the wall surface of the horn forming the waveguide. It is characterized by

According to the present invention, the directivity and strength of radio waves emitted from the waveguide are improved by the shield layer, and by adopting a resin horn, the amount of metal used can be suppressed and the weight of the radar device can be reduced. can be realized. Further features related to the present invention will become apparent from the description of the specification and the accompanying drawings. Further, problems, configurations, and effects other than those described above will be clarified by the following description of the embodiments.

1 is an exploded perspective view of a radar device according to a first embodiment; FIG. 1 is a schematic cross-sectional view of a radar device according to a first embodiment; FIG. FIG. 3A is an explanatory diagram of a radio wave radiation state according to a comparative example, and FIG. 3B is an explanatory diagram of a radio wave radiation state according to the first embodiment. 4A is an explanatory diagram of a radio wave radiation state from multiple antennas according to a comparative example, and FIG. 4B is an explanatory diagram of a radio wave radiation state from multiple antennas according to the first embodiment. FIG. 5A is an explanatory diagram of a heat transfer path and a heat dissipation path according to a comparative example, and FIG. 5B is an explanatory diagram of a heat transfer path and a heat dissipation path according to the first embodiment. The cross-sectional schematic diagram of the radar apparatus of 2nd Embodiment. The cross-sectional schematic diagram of the radar apparatus of 3rd Embodiment. The cross-sectional schematic diagram of the radar apparatus of 4th Embodiment. The cross-sectional schematic diagram of the radar apparatus of 5th Embodiment. The cross-sectional schematic diagram of the radar apparatus of 6th Embodiment. The cross-sectional schematic diagram of the radar apparatus of 7th Embodiment. The cross-sectional schematic diagram of the radar apparatus of 8th Embodiment. The cross-sectional schematic diagram of the radar apparatus of 9th Embodiment.

[First embodiment]
Hereinafter, the overall configuration of the radar device according to the first embodiment will be described with reference to FIG. FIG. 1 is an exploded perspective view of the radar device according to the first embodiment. In the following description, a millimeter wave radar will be exemplified as a radar device, but the technique of the present disclosure can be used for other radar devices that detect obstacles by emitting radio waves.

As shown in FIG. 1, the radar device 1 is a millimeter wave radar device that emits radio waves in the millimeter wave band and receives reflected waves from obstacles to detect obstacles. A plurality of MMIC (Monolithic Microwave Integrated Circuit) chips 14 are provided on one main surface 11 of the substrate 10 of the radar device 1 . A plurality of antennas 13 are connected to each MMIC chip 14 via feeder lines (not shown). A radio wave is radiated from each antenna 13 by power supply from each MMIC chip 14, and the radio wave captured by each antenna 13 is sent to each MMIC chip 14 through a feeder line.

The antenna 13 may be a flat antenna such as a patch antenna provided on the substrate 10 or may be a surface-mounted chip antenna provided on the substrate 10 . Although the MMIC chip 14 for transmission and reception is arranged as a semiconductor chip on the substrate 10, the MMIC chip 14 for transmission and the MMIC chip 14 for reception may be arranged separately. Other MIC (Microwave Integrated Circuit) chips may be used as semiconductor chips. Further, as the substrate 10, a glass epoxy substrate, a ceramic substrate, or the like may be used, or a high frequency substrate made of fluorine resin having a low dielectric constant may be used.

On one main surface 11 of the substrate 10 of the radar device 1, a resin horn 20 having a rectangular shape in plan view and having a metal-plated outer surface is arranged. Waveguides 23 are formed in the horn 20 at positions corresponding to the plurality of antennas 13 on the substrate 10 . Each waveguide 23 is classified into types for short distance, medium distance, and long distance. It is possible to detect obstacles at different distances from the radar device 1 by emitting radio waves from the plurality of waveguides 23 to the outside. Each waveguide 23 is formed in a pyramidal or conical shape by the tapered surface of the horn 20 so that the width of each waveguide 23 increases with increasing distance from one main surface 11 of the substrate 10 .

The horn 20 is made of PBT (Polybutylene Terephthalate) resin, PPS (Poly Phenylene Sulfide) resin, PP (Poly Propylene) resin, ABS (Acrylonitrile Butadiene Styrene) resin, PS (Poly Styrene) resin, PE (Poly Ethylene) resin. , PVC (Poly Vinyl Chloride) resin, PC (Poly Carbonate) resin, PET (Poly Ethylene Terephthalate) resin, LCP (Liquid Crystal Polymer) resin, PPO (Poly Phenylene Oxide) resin, Epoxy resin, Si (Silicone) A resin, a thermoplastic resin based on polyester resin or the like, or a thermosetting resin, which is lightweight and has low thermal conductivity, may be used. The metal film 28 (see FIG. 2) formed on the outer surface of the horn 20 by metal plating includes silver (Ag), copper (Cu), gold (Au), nickel (Ni), which have high thermal conductivity and shielding properties. ), tin (Sn), etc. may be used. The metal film 28 on the outer surface of the horn 20 may be formed by a sputtering method, an inkjet method, a screen printing method, a CVD (Chemical Vapor Deposition) method, a PVD (Physical Vapor Deposition) method, or the like, in addition to plating.

The horn 20 is provided with a rectangular lens 30 in plan view so as to cover the plurality of waveguides 23 . A plurality of lens surfaces 31 (see FIG. 2) corresponding to the plurality of waveguides 23 of the horn 20 are formed on the rear surface of the lens 30 on the substrate 10 side. Radio waves radially diffused in the waveguide 23 from the antenna 13 are converted into plane waves by the lens 30 and emitted to the outside. Reflected waves from the outside are converged within the waveguide 23 by the lens 30 and received by the antenna 13 . Note that dielectric materials such as PBT resin and PPS resin may be used for the lens 30 .

The outer edges of the horn 20 and the lens 30 are held by a rectangular frame-shaped housing 35 .
The housing 35 has an opening edge portion 36 that prevents the horn 20 and the lens 30 from coming off, and a side wall portion 37 that forms the side surface of the radar device 1 . A cover 39 forming the surface of the radar device 1 is fixed on the opening edge 36 of the housing 35 . The cover 39 bulges out except for the outer peripheral portion fixed to the housing 35, and functions as a radome that protects the inside of the device from the natural environment such as rain and wind. A resin material such as PBT resin or PPS resin may be used for the housing 35 and the cover 39 .

A radiator plate 40 for releasing heat from the substrate 10 is provided on the other main surface 12 of the substrate 10 .
A plurality of supports 41 are formed on the surface of the heat sink 40 on the side of the substrate 10 at positions corresponding to the plurality of MMIC chips 14 on the substrate 10 . The back surface of the heat sink 40 is supported by a base 45 that forms the back surface of the radar device 1 . The supporting surface of each support table 41 is in contact with the substrate 10 through the heat dissipation sheet S1, and the base 45 is in contact with the heat dissipation plate 40 through the heat dissipation sheet S2. In the radar device 1 , a heat dissipation path for releasing heat from the MMIC chip 14 is formed by the heat dissipation plate 40 and the base 45 . A material with high thermal conductivity such as aluminum may be used for the radiator plate 40 and the base 45 . Although not shown, the radiator plate 40 and the base 45 do not necessarily need to be separated as shown in FIG. That is, the radiator plate 40 may function as a heat radiator, or a component in which the radiator plate 40 and the base 45 are integrated may function as a radiator member.

A detailed configuration of the radar apparatus according to the first embodiment will be described with reference to FIG. FIG. 2 is a schematic cross-sectional view of the radar device according to the first embodiment.

As shown in FIG. 2, an MMIC chip 14 is arranged on one main surface 11 of the substrate 10, and an antenna 13 is provided apart from the MMIC chip 14. As shown in FIG. Also, on one main surface 11 of the substrate 10, a horn 20 having a metal film 28 formed by metal plating on the outer surface of a resin molding is arranged. A peripheral wall portion 21 surrounding the outer edge of the substrate 10 is provided on the outer peripheral portion of the horn 20 . A horn body 22 having a waveguide 23 formed therein is provided inside the horn 20, and portions corresponding to the MMIC chip 14 and the antenna 13 protrude from the rear surface of the horn body 22 on the substrate 10 side.

A contact portion 24 having a trapezoidal cross-sectional view and contacting the surface of the MMIC chip 14 is provided on the rear surface of the horn body 22 at a location corresponding to the MMIC chip 14 . A thin guide portion 25 protruding along the waveguide 23 is provided on the rear surface of the horn body 22 at a location corresponding to the antenna 13 . The waveguide 23 is formed by the horn main body 22 and the tapered wall surface 26 of the guide portion 25 such that the distance between the waveguides 23 increases as the distance from the main surface 11 of the substrate 10 increases. A lens 30 is arranged on the front side of the horn main body 22, and a convex lens surface 31 is formed on the back side of the lens 30 with the center line of the waveguide 23 as the optical axis.

A heat sink 40 is provided on the other main surface 12 of the substrate 10 . A peripheral wall portion 42 surrounding the outer edge of the substrate 10 is provided on the outer peripheral portion of the heat sink 40 , and a support base 41 is provided on the inner portion of the heat sink 40 so as to contact the substrate 10 at a location corresponding to the MMIC chip 14 . . The peripheral wall portion 42 of the heat sink 40 is in contact with the peripheral wall portion 21 of the horn 20, and the support base 41 of the heat sink 40 is in contact with the substrate 10 via the heat sink sheet S1. The heat sink 40 is supported by the base 45 via the heat sink sheet S2. Since the base 45 is made of metal with high thermal conductivity like the heat sink 40, the base 45 also functions as a heat sink.

Since the outer surface of the horn 20 is covered with the metal film 28 , the wall surface of the horn 20 forming the waveguide 23 is formed with a shield layer 29 that shields radio waves with the metal film 28 . As a result, the radio wave shielding property in the waveguide 23 is ensured, and the directivity and strength of the radio wave are improved. Further, since the contact portion 24 is in contact with the surface of the MMIC chip 14 through the metal film 28, the heat transfer path R2 from the MMIC chip 14 to the shield layer 29 is formed by the metal film 28, and the MMIC chip A heat dissipation path R3 from 14 to the heat dissipation plate 40 is formed of the metal film 28. As shown in FIG. As a result, the occurrence of dew condensation in the waveguide 23 is prevented, and the temperature rise of the MMIC chip 14 is suppressed.

The directivity and intensity of radio waves of a radar device will be described with reference to FIGS. 3A and 3B.
FIG. 3A is an explanatory diagram of a radiation state of radio waves according to a comparative example. FIG. 3B is an explanatory diagram of the radiation state of radio waves according to the first embodiment. The radar device of the comparative example differs from the radar device of the present embodiment only in that the outer surface of the resin horn is not plated with metal.

As shown in FIG. 3A, in the radar device 50 according to the comparative example, when power is supplied from the MMIC chip 53 to the antenna 52, radio waves are radiated from the antenna 52 to the outside. A radio wave directed from the antenna 52 toward the inside of the waveguide 55 is guided through the waveguide 55 to the lens surface 57, converted into a plane wave by the lens surface 57, and used to detect obstacles. Radio waves from the antenna 52 directed to the outside of the waveguide 55 go straight through the resin-made horn 54 and are emitted to the outside, and are not used for detecting obstacles. Therefore, although the weight of the horn 54 can be reduced, the radio wave utilization efficiency is lowered, and the directivity and strength of the radio wave are lowered.

On the other hand, as shown in FIG. 3B , in the radar device 1 according to the first embodiment, a shield layer 29 is formed of a metal film 28 on the tapered wall surface 26 of the horn 20 forming the waveguide 23 to form the waveguide. 23 shielding is ensured. Both the radio wave from the antenna 13 to the inside of the waveguide 23 and the radio wave from the antenna 13 to the outside of the waveguide 23 are guided to the lens surface 31 by the shield layer 29 of the horn 20 and converted into plane waves by the lens surface 31. Used for obstacle detection. Therefore, the weight of the horn 20 can be reduced, the radio wave utilization efficiency is increased, the directivity and strength of the radio wave are improved, and the detection accuracy is improved.

Radio wave interference of the radar apparatus will be described with reference to FIGS. 4A and 4B. FIG. 4A is an explanatory diagram of a radiation state of radio waves from a plurality of antennas according to a comparative example. FIG. 4B is an explanatory diagram of a radiation state of radio waves by a plurality of antennas according to the first embodiment.

As shown in FIG. 4A, a radar device 50 according to the comparative example has a plurality of waveguides 55 corresponding to a plurality of antennas 52, and radio waves are radiated from each antenna 52 at the same time. Radio waves directed from each antenna 52 toward the inside of each waveguide 55 are guided to the lens surface 57 through the waveguide 55, converted into plane waves by the lens surface 57, and used to detect obstacles. Radio waves from each antenna 52 directed to the outside of each waveguide 55 go straight through the resin-made horn 54 and enter the adjacent waveguide 55 to cause radio wave interference. Obstacle detection performance is degraded by this radio wave interference.

On the other hand, as shown in FIG. 4B , in the radar device 1 according to the first embodiment, even if radio waves are radiated from the plurality of antennas 13 at the same time, the shield layer 29 of the horn 20 prevents radio waves from reaching the outside of the waveguide 23 . Leakage is prevented. Both the radio wave from the antenna 13 to the inside of the waveguide 23 and the radio wave from the antenna 13 to the outside of the waveguide 23 are guided to the lens surface 31 by the shield layer 29 of the horn 20 and converted into plane waves by the lens surface 31. Used for obstacle detection. Therefore, radio wave interference does not occur between the plurality of waveguides 23, and obstacle detection performance does not deteriorate due to radio wave interference.

A heat transfer path and a heat dissipation path of the radar device will be described with reference to FIGS. 5A and 5B.
FIG. 5A is an explanatory diagram of a heat transfer path and a heat dissipation path according to a comparative example; FIG. 5B is an explanatory diagram of a heat transfer path and a heat dissipation path according to the first embodiment;

As shown in FIG. 5A, in the radar device 50 according to the comparative example, when the air inside the device is warmed by the heat generated by the MMIC chip 53, condensation 59 occurs on the tapered wall surface 58 of the horn 54 due to the temperature difference between the inside and the outside, and radio waves are generated. may be disturbed. Heat generated by the MMIC chip 53 is transmitted to the support base 61 of the heat sink 60 through the substrate 51 and the heat sink sheet S1, and further from the heat sink 60 to the base 62 through the heat sink sheet S2. The temperature rise of the MMIC chip 53 cannot be effectively suppressed only by the heat dissipation path R1 extending from the MMIC chip 53 in the thickness direction of the substrate 51 alone.

On the other hand, as shown in FIG. 5B, in the radar device 1 according to the first embodiment, a heat transfer path R2 from the MMIC chip 14 to the shield layer 29 is formed on the outer surface of the horn 20 .
The heat transfer path R2 is formed by a metal film 28 covering the outer surface of the horn 20 from the contact portion 24 to the guide portion 25. At the tip portion of the guide portion 25, the metal film 28 of the heat transfer path R2 and the metal of the shield layer 29 are formed. A membrane 28 is continuous. The heat generated by the MMIC chip 14 is transmitted to the shield layer 29 through the heat transfer path R2, and the shield layer 29 is warmed, thereby suppressing the formation of dew condensation 59. In this way, the heat generation of the MMIC chip 14 is used to suppress the occurrence of dew condensation 59 on the waveguide 23 .

At this time, the heat generated by the MMIC chip 14 is easily transmitted to the metal film 28 on the outer surface of the horn 20, but since the resin-molded portion of the horn 20 has a low thermal conductivity, the resin-molded portion inside the metal film 28 on the outer surface of the horn 20 is heated. It is difficult for heat to be transmitted to Since heat is intensively transferred from the MMIC chip 14 to the metal film 28 having high thermal conductivity and small heat capacity, the heat generated by the MMIC chip 14 can heat the shield layer 29 in a short time through the heat transfer path R2. Therefore, the shield layer 29 can be warmed immediately after the radar device 1 is started, and the disturbance of radio waves due to the condensation 59 can be effectively suppressed.

Further, in the radar device 1 according to the first embodiment, a heat radiation path R3 is formed on the outer surface of the horn 20 from the MMIC chip 14 toward the heat radiation plate 40 . The heat radiation path R3 is formed by a metal film 28 covering the outer surface of the horn 20 from the contact portion 24 to the peripheral wall portion 21, and the heat radiation path R3 is formed at the joint surface between the peripheral wall portion 21 of the horn 20 and the peripheral wall portion 42 of the heat sink 40. Metal film 28 is in contact with heat sink 40 . The heat generated by the MMIC chip 14 is transmitted to the peripheral wall portion 42 of the heat sink 40 through the heat radiation path R3, and is then transmitted from the heat sink 40 to the base 45 via the heat radiation sheet S2.
In this way, in addition to the heat radiation path R1 extending from the MMIC chip 14 in the thickness direction of the substrate 10, the temperature rise of the MMIC chip 14 can be suppressed by the heat radiation path R3 passing from the MMIC chip 14 through the outer surface of the horn 20.

Here, although the shield layer 29, the heat transfer path R2, and the heat dissipation path R3 are formed of the metal film 28 of the same material, the configuration is not limited to this. The shield layer 29 may be formed of a metal film having a higher shielding property than the heat transfer path R2 and the heat dissipation path R3, and the heat transfer path R2 and the heat dissipation path R3 may be formed of a metal film having a higher thermal conductivity than the shield layer 29. good. For example, nickel with high shielding properties may be used for the shield layer 29, and copper with high thermal conductivity may be used for the heat transfer path R2 and the heat dissipation path R3. Nickel requires a thickness of 0.021 μm or more to ensure shielding properties, and copper requires a thickness of 10 μm or more to ensure heat conductivity.

When the shield layer 29, the heat transfer path R2 and the heat dissipation path R3 are formed of the same metal film 28, the thickness of the metal film of the heat transfer path R2 and the heat dissipation path R3 is greater than the thickness of the metal film 28 of the shield layer 29. The thickness of 28 may be formed large. For example, when the shield layer 29, the heat transfer path R2, and the heat dissipation path R3 are formed of a copper film, the shield layer 29 is formed of a copper film having a thickness of 0.24 μm or more, and the heat transfer path R2 and the heat dissipation path R3 are formed of a copper film having a thickness of 10 μm. It may be formed of a copper film having a thickness equal to or greater than the above thickness. As a result, the heat generated by the MMIC chip 14 can be easily transferred from the MMIC chip 14 to the metal film 28 by the thickness of the metal film 28 of the heat transfer path R2 and the heat dissipation path R3. Moreover, the shield layer 29 may be formed with a multi-layer structure, for example, it may be formed with a two-layer structure of nickel with high shielding properties and copper with high thermal conductivity.

As described above, in the radar device 1 of the first embodiment, the metal film 28 ensures the shielding property inside the waveguide 23, and the directivity and the intensity of the radio waves emitted from the waveguide 23 are improved. . Moreover, by adopting the resin horn 20, the amount of metal used can be reduced, and the weight of the radar device 1 can be reduced. The heat transfer path R2 passing through the outer surface of the horn 20 makes it possible to use the heat generated by the MMIC chip 14 to suppress the occurrence of dew condensation on the waveguide 23. FIG. Further, the heat generated by the MMIC chip 14 is released to the heat sink 40 by the heat radiation path R3 passing through the outer surface of the horn 20, so that the temperature rise of the MMIC chip 14 can be suppressed.

In the first embodiment, the metal film 28 on the outer surface of the horn 20 is used to increase the number of heat radiation paths. may The heat dissipation paths of the radar apparatus will be described below with reference to second to ninth embodiments. In addition, in the second to ninth embodiments, substantially the same or similar configurations as in the first embodiment are denoted by the same reference numerals.

[Second embodiment]
FIG. 6 is a schematic cross-sectional view of the radar device of the second embodiment. The radar device of the second embodiment differs from that of the first embodiment only in the partial configurations of the substrate, the horn, and the radiator plate. Therefore, only the heat radiation path will be mainly described, and the description of the configuration similar to that of the first embodiment will be omitted as much as possible. Here, the heat dissipation path of the MMIC chip will be described, but the heat dissipation path of the following embodiments can also be applied to heat dissipation of other electronic components.

As shown in FIG. 6, the radar device 1 according to the second embodiment has an MMIC chip 14 as an electronic component provided on one main surface 11 of the substrate 10 . A heat dissipation path R4 is formed on one main surface 11 of the substrate 10 by a heat dissipation pattern 15 extending from the vicinity of the MMIC chip 14 to the outer edge of the substrate 10 . The heat dissipation pattern 15 is electrically separated from the circuit pattern. One end of the heat radiation pattern 15 is slightly separated from the MMIC chip 14 , and the other end of the heat radiation pattern 15 is in contact with the peripheral wall 21 of the horn 20 at the outer edge of the substrate 10 . Note that the heat dissipation pattern 15 may be made of a material having high thermal conductivity such as copper or aluminum. Also, the other end of the heat dissipation pattern 15 may extend along the outer edge of the substrate 10 .

The MMIC chip 14 is coated with heat radiation grease G1 as a semi-solid or gel heat radiation member, and the MMIC chip 14 is connected to one end of the heat radiation pattern 15 via the heat radiation grease G1. The other end of the heat radiation pattern 15 is coated with heat radiation grease G2, and the other end of the heat radiation pattern 15 is connected to the horn 20 via the heat radiation grease G2. Thermal resistance can be reduced by the heat dissipation greases G1 and G2 entering the gap between the MMIC chip 14 and the heat dissipation pattern 15 and the gap between the horn 20 and the heat dissipation pattern 15 . As the heat dissipating member, a heat dissipating adhesive obtained by dispersing a heat conductive filler in an adhesive may be used instead of the heat dissipating grease obtained by dispersing the heat conductive filler in the grease.

Further, the horn 20 and the heat dissipation plate 40 are formed with a heat dissipation path R5 by protruding portions 27 and 43 protruding from the outer edge of the substrate 10 . The protruding portion 27 of the horn 20 protrudes from the peripheral wall portion 21 so as to cover the outer edge portion on the one main surface 11 side of the substrate 10 , and the protruding portion 43 of the heat sink 40 extends to the other main surface of the substrate 10 . The protruding portion 27 of the horn 20 and the protruding portion 43 of the radiator plate 40 are in contact with each other, protruding from the peripheral wall portion 42 so as to cover the outer edge portion on the 12 side. The protruding portion 27 of the horn 20 and the protruding portion 43 of the heat sink 40 are formed along the outer edge of the substrate 10, and the horn 20 and the heat sink 40 are in contact with each other over a wide range. In addition, protrusions 27 and 43 may be partially formed in the horn 20 and the radiator plate 40 along a part of the outer edge of the substrate 10 .

Depending on the state of contact between the protruding portion 27 of the horn 20 and the protruding portion 43 of the radiator plate 40, a slight gap between the contact surfaces of the protruding portions 27 and 43 may increase thermal resistance. For this reason, the protruding portion 27 of the horn 20 and the protruding portion 43 of the heat sink 40 are connected via the heat dissipation grease G3. As a result, the gap between the contact surfaces of the protruding portion 27 of the horn 20 and the protruding portion 43 of the radiator plate 40 is filled with the heat radiating grease G3, and the thermal resistance between the horn 20 and the heat radiating plate 40 is reduced by the heat radiating grease G3. can be reduced. In addition, when the protruding portion 27 of the horn 20 and the protruding portion 43 of the heat sink 40 are in contact with each other without a gap, the heat dissipation grease G3 is unnecessary.

As described above, in the radar device 1 of the second embodiment, the heat radiation path R4 from the MMIC chip 14 to the horn 20 is formed by the heat radiation pattern 15 and the heat radiation greases G1 and G2. Further, in the radar device 1, a heat dissipation route R5 from the horn 20 to the heat dissipation plate 40 is formed by the protrusions 27 and 43 and the heat dissipation grease G3. Thus, in addition to the heat radiation path R1 extending from the MMIC chip 14 in the thickness direction of the substrate 10, the heat radiation paths R4 and R5 form heat radiation paths with low thermal resistance. Therefore, the temperature rise of the MMIC chip 14 can be effectively suppressed by the plurality of heat dissipation paths R1, R4, R5.

[Third embodiment]
FIG. 7 is a schematic cross-sectional view of the radar device of the third embodiment. The radar apparatus of the third embodiment differs from the second embodiment in that a heat dissipation sheet is used as a heat dissipation member instead of the heat dissipation grease. Therefore, the description of the same configuration as that of the second embodiment will be omitted as much as possible. Here, the heat dissipation path of the MMIC chip will be described, but the heat dissipation path of the following embodiments can also be applied to heat dissipation of other electronic components.

As shown in FIG. 7, in the radar device 1 according to the third embodiment, a heat dissipation sheet S3 is attached to the MMIC chip 14, and the MMIC chip 14 is attached to one end of the heat dissipation pattern 15 via the heat dissipation sheet S3. It is connected. A heat dissipation sheet S4 is attached to the other end of the heat dissipation pattern 15, and the other end of the heat dissipation pattern 15 is connected to the horn 20 via the heat dissipation sheet S4. The protruding portion 27 of the horn 20 and the protruding portion 43 of the heat dissipation plate 40 are connected via a heat dissipation sheet S5 provided along the outer edge of the substrate 10 . As the heat dissipation sheet, for example, a sheet material containing a heat conductive filler is used.

As described above, in the radar device 1 of the third embodiment, the heat radiation path R4 from the MMIC chip 14 to the horn 20 is formed by the heat radiation pattern 15 and the heat radiation sheets S3 and S4. Further, in the radar device 1, a heat dissipation path R5 from the horn 20 to the heat dissipation plate 40 is formed by the protrusions 27 and 43 and the heat dissipation sheet S5. Thus, the temperature rise of the MMIC chip 14 can be effectively suppressed by the plurality of heat dissipation paths R1, R4, R5. In addition, the thickness of the heat radiating member can be made constant, and variations in heat dissipation due to differences in the thickness of the heat radiating member can be reduced. In addition, it is possible to suppress variations in device dimensions when assembling the radar device 1 .

[Fourth embodiment]
FIG. 8 is a schematic cross-sectional view of the radar device of the fourth embodiment. The radar device of the fourth embodiment differs from that of the second embodiment in that the heat radiation path is formed by a metal plate. Therefore, the description of the same configuration as that of the second embodiment will be omitted as much as possible. Here, the heat dissipation path of the MMIC chip will be described, but the heat dissipation path of the following embodiments can also be applied to heat dissipation of other electronic components.

As shown in FIG. 8, in the radar device 1 according to the fourth embodiment, the MMIC chip 14 is coated with the heat dissipation adhesive A1, and the MMIC chip 14 is attached to one end of the heat dissipation pattern 15 via the heat dissipation adhesive A1. It is connected to the. A heat dissipation grease G2 is applied to the other end of the heat dissipation pattern 15, and the other end of the heat dissipation pattern 15 is connected to the horn 20 via the heat dissipation grease G2. A heat radiation path R6 is formed on one main surface 11 of the substrate 10 by a metal plate 19 spaced from the main surface 11 in the height direction. The metal plate 19 extends from the upper surface of the MMIC chip 14 to a midway portion in the extending direction of the heat dissipation pattern 15 .

One end of the metal plate 19 is supported by the heat dissipation adhesive A1 on the MMIC chip 14, and the other end of the metal plate 19 is supported by the heat dissipation adhesive A2 on the heat dissipation pattern 15. FIG. It should be noted that the metal plate 19 may be made of a material having high thermal conductivity such as copper or aluminum, like the heat dissipation pattern 15 . The shape and structure of the metal plate 19 are not particularly limited. The protruding portion 27 of the horn 20 and the protruding portion 43 of the heat sink 40 are connected via heat dissipating grease G3 provided along the outer edge of the substrate 10 . Incidentally, in the fourth embodiment, a heat dissipation sheet may be used instead of the heat dissipation greases G2 and G3.

As described above, in the radar device 1 of the fourth embodiment, in addition to the heat radiation paths R1, R4, and R5, the heat radiation adhesives A1 and A2 and the metal plate 19 extend from the MMIC chip 14 to the heat radiation pattern 15. A heat dissipation path R6 is formed. A temperature rise of the MMIC chip 14 can be effectively suppressed by the plurality of heat dissipation paths R1, R4-R6.

[Fifth Embodiment]
FIG. 9 is a schematic cross-sectional view of the radar device of the fifth embodiment. The radar device of the fifth embodiment is different from the second embodiment in that the heat radiation path is formed by the wall . Therefore, the description of the same configuration as that of the second embodiment will be omitted as much as possible. Here, the heat dissipation path of the MMIC chip will be described, but the heat dissipation path of the following embodiments can also be applied to heat dissipation of other electronic components.

As shown in FIG. 9 , in the radar device 1 according to the fifth embodiment, one end side of the heat radiation pattern 15 is formed in a ring so as to surround the MMIC chip 14 . The heat dissipation grease G1 is applied to the MMIC chip 14, and the heat dissipation pattern 15 of the MMIC chip 14 is connected to the annular portion through the heat dissipation grease G1. The heat dissipation grease G2 is applied to the other end of the heat dissipation pattern 15, and the other end of the heat dissipation pattern 15 is connected to the peripheral wall portion 21 of the horn 20 via the heat dissipation grease G2. The horn 20 has a heat radiation path R7 formed by a wall portion 33 surrounding the MMIC chip 14. As shown in FIG.

The wall portion 33 protrudes from the rear surface of the horn 20 on the substrate 10 side and is connected to the annular portion of the heat dissipation pattern 15 via the heat dissipation grease G4. Note that the cross-sectional shape of the wall portion 33 in plan view is not limited to an annular shape, and may be any shape that can surround the MMIC chip 14 . Similarly, the annular portion of the heat radiation pattern 15 is not limited to an annular shape, and may have any shape that can surround the MMIC chip 14 . Further, the protruding portion 27 of the horn 20 and the protruding portion 43 of the heat sink 40 are connected via heat dissipating grease G3 provided along the outer edge of the substrate 10 . Incidentally, in the fifth embodiment, a heat dissipation sheet may be used instead of the heat dissipation greases G1 to G4.

As described above, in the radar device 1 of the fifth embodiment, in addition to the heat dissipation paths R1, R4, and R5, heat dissipation from one end of the heat dissipation pattern 15 to the horn 20 is caused by the heat dissipation grease G4 and the wall portion 33. A route R7 is formed. A temperature rise of the MMIC chip 14 can be effectively suppressed by the plurality of heat dissipation paths R1, R4, R5, and R7.

[Sixth Embodiment]
FIG. 10 is a schematic cross-sectional view of the radar device of the sixth embodiment. The radar device of the sixth embodiment is different from the second embodiment in that the heat dissipation path is formed by heat dissipation vias. Therefore, the description of the same configuration as that of the second embodiment will be omitted as much as possible. Here, the heat dissipation path of the MMIC chip will be described, but the heat dissipation path of the following embodiments can also be applied to heat dissipation of other electronic components.

As shown in FIG. 10, in the radar device 1 according to the sixth embodiment, the MMIC chip 14 on one main surface 11 of the substrate 10 is coated with the heat dissipation grease G1. It is connected to one end of the heat dissipation pattern 15 via the heat dissipation pattern 15 . A heat dissipation grease G2 is applied to the other end of the heat dissipation pattern 15, and the other end of the heat dissipation pattern 15 is connected to the horn 20 via the heat dissipation grease G2. A heat dissipation pattern 16 is formed along the outer edge of the substrate 10 on the other main surface 12 of the substrate 10, and the heat dissipation pattern 16 is connected to the heat dissipation plate 40 via heat dissipation grease G5.

A heat dissipation path R8 is formed at the outer edge of the substrate 10 by a conductive heat dissipation via 17 that penetrates the substrate 10 in the thickness direction and connects the heat dissipation pattern 15 and the heat dissipation pattern 16 . In this way, instead of forming the heat dissipation path by the protruding portions of the horn 20 and the heat dissipation plate 40, by forming the heat dissipation path by the heat dissipation vias 17, it is possible to reduce the size of the device. The configuration is not limited to the configuration in which the heat dissipation patterns 15 and 16 are provided on one main surface 11 and the other main surface 12, and the heat dissipation pattern 15 may be provided only on one main surface 11. FIG. Incidentally, in the sixth embodiment, a heat dissipation sheet may be used instead of the heat dissipation greases G1, G2, and G5.

As described above, in the radar device 1 of the sixth embodiment, in addition to the heat radiation paths R1 and R4, the heat radiation path R8 from the horn 20 to the heat radiation plate 40 is formed by the heat radiation vias 17. A temperature rise of the MMIC chip 14 can be effectively suppressed by the plurality of heat dissipation paths R1, R4, and R8. The heat dissipation vias 17 need only be formed so that the horn 20 and the heat dissipation plate 40 can be connected, and the heat dissipation vias 17 need not be connected to the heat dissipation patterns 15 and 16 .

[Seventh Embodiment]
FIG. 11 is a schematic cross-sectional view of the radar device of the seventh embodiment. The radar device of the seventh embodiment is different from that of the second embodiment in that the radiation pattern is covered with a resist layer except for a part. Therefore, the description of the same configuration as that of the second embodiment will be omitted as much as possible. Here, the heat dissipation path of the MMIC chip will be described, but the heat dissipation path of the following embodiments can also be applied to heat dissipation of other electronic components.

As shown in FIG. 11, in the radar device 1 according to the seventh embodiment, the heat dissipation pattern 15 is covered with a resist layer 18 except for both ends. A heat dissipation grease G1 is applied to the MMIC chip 14, and the MMIC chip 14 is connected to one end (exposed portion) of the heat dissipation pattern 15 exposed from the resist layer 18 via the heat dissipation grease G1. Also, the other end (exposed portion) of the heat dissipation pattern 15 exposed from the resist layer 18 is coated with heat dissipation grease G2, and the other end of the heat dissipation pattern 15 is connected to the horn 20 via the heat dissipation grease G2. . Note that the heat dissipation path of the seventh embodiment is the same as that of the second embodiment.

As described above, in the radar device 1 of the sixth embodiment, the temperature rise of the MMIC chip 14 can be effectively suppressed by the plurality of heat dissipation paths. Even if the heat radiation pattern 15 is covered with the resist layer 18, a heat radiation path with a small heat resistance can be formed.

[Eighth Embodiment]
FIG. 12 is a schematic cross-sectional view of the radar device of the eighth embodiment. The radar device of the eighth embodiment is different from the second embodiment in that the horn is provided with a contact portion that contacts the MMIC chip. Therefore, the description of the same configuration as that of the second embodiment will be omitted as much as possible. Here, the heat dissipation path of the MMIC chip will be described, but the heat dissipation path of the following embodiments can also be applied to heat dissipation of other electronic components.

As shown in FIG. 12, in the radar device 1 according to the eighth embodiment, the contact portion 24 of the horn 20 is in contact with the surface of the MMIC chip 14 via heat dissipation grease G1. For this reason, the horn 20 is formed with a heat transfer path R2 from the MMIC chip 14 to the shield layer (see FIG. 1) and a heat dissipation path R3 from the MMIC chip 14 to the heat sink 40. FIG. Further, in the radar device 1 according to the eighth embodiment, heat radiation paths R1, R4, and R5 are formed as in the second embodiment. As a result, the occurrence of dew condensation in the waveguide is prevented, and the temperature rise of the MMIC chip 14 is suppressed.

As described above, in the radar device 1 of the seventh embodiment, it is possible to effectively suppress the temperature rise of the MMIC chip 14 by means of a plurality of heat dissipation paths. Further, by increasing the number of heat dissipation paths, even if the metal film plated on the outer surface of the resin horn 20 is formed thin, the temperature rise of the MMIC chip 14 can be suppressed to a specified temperature.

[Ninth Embodiment]
FIG. 13 is a schematic cross-sectional view of the radar device of the ninth embodiment. The radar device of the ninth embodiment differs from that of the second embodiment in that it uses a metal horn. Therefore, the description of the same configuration as that of the second embodiment will be omitted as much as possible. Here, the heat dissipation path of the MMIC chip will be described, but the heat dissipation path of the following embodiments can also be applied to heat dissipation of other electronic components.

As shown in FIG. 13, in the radar device 1 according to the ninth embodiment, the horn 20 is made of a material having high shielding properties and thermal conductivity, such as aluminum. Further, in the radar device 1 according to the ninth embodiment, heat radiation paths R1, R4, and R5 are formed as in the second embodiment. Even with such a configuration, the temperature rise of the MMIC chip 14 can be effectively suppressed by a plurality of heat dissipation paths. Also, by using the metal horn 20 having a large heat capacity, the heat dissipation of the MMIC chip 14 can be enhanced.

In each of the above-described embodiments, the substrate 10 is provided with a plurality of antennas 13 and the horn 20 is provided with a plurality of waveguides 23. However, the substrate 10 is provided with a single antenna 13 and the horn A single waveguide 23 may be formed in 20 .

In each of the above-described embodiments, the metal film 28 is formed on the entire outer surface of the horn 20, and the shield layer 29, the heat transfer path R2, and the heat dissipation path R3 are formed, but the configuration is not limited to this. A metal film 28 may be partially formed on the outer surface of the horn 20 to form the shield layer 29, the heat transfer path R2, and the heat dissipation path R3.

As described above, the radar device (1) according to the present embodiment includes a substrate (10) provided with an antenna (13) on one main surface (11), and one main surface (11) of the substrate (10). ), and the horn (20) is provided with one main antenna (10) of the substrate (10) at a position corresponding to the antenna (13). A waveguide (23) is formed which becomes wider with distance from the surface (11), and a shield layer (29) is formed of a metal film (28) on the wall surface (26) of the horn (20) forming the waveguide (23). It is

According to this configuration, the metal film (28) secures the shielding property in the waveguide (23), and the directivity and radio wave intensity of the radio waves emitted from the waveguide (23) are improved. Moreover, by adopting the resin horn (20), it is possible to reduce the amount of metal used and reduce the weight of the radar device (1).

In the radar device (1) according to this embodiment, the antenna (13) is a plurality of antennas (13) provided on one main surface (11) of the substrate (10), and the waveguide (23) is a horn. A plurality of waveguides (23) formed at positions corresponding to the plurality of antennas (13) of (20).

According to this configuration, radio wave interference can be suppressed between the plurality of waveguides (23).

In the radar device (1) according to this embodiment, an electronic component (MMIC chip 14) connected to an antenna (13) is arranged on one main surface (11) of a substrate (10), and a horn ( In 20), a heat transfer path (R2) from the electronic component (MMIC chip 14) to the shield layer (29) is formed of a metal film.

According to this configuration, the heat transfer path (R2) passing through the outer surface of the horn (20) utilizes the heat generated by the electronic component (MMIC chip 14) to suppress the occurrence of condensation (59) on the waveguide (23). be able to. The horn (20) is made of resin with low thermal conductivity, and the heat is intensively transmitted from the electronic component (MMIC chip 14) to the metal with high thermal conductivity, so that the shield layer (29) can be warmed in a short period of time. can.

The radar device (1) according to the present embodiment includes a heat dissipation member (heat dissipation plate 40) provided on the other main surface (12) of the substrate (10), and the horn (20) includes an electronic component (MMIC A heat dissipation route (R3) from the chip 14) to the heat dissipation member (heat dissipation plate 40) is formed of a metal film.

According to this configuration, the heat generated by the electronic component (MMIC chip 14) is dissipated to the heat radiating member (radiating plate 40) through the heat radiation path (R3) passing through the outer surface of the horn (20). ) can be suppressed.

In the radar device (1) according to this embodiment, the shield layer (29) is formed of a metal film (28) having a higher shielding property than the heat transfer path (R2) and the heat dissipation path (R3). R2) and the heat radiation path (R3) are formed of a metal film (28) having a higher thermal conductivity than the shield layer (29).

According to this configuration, it is possible to improve the shielding performance of the waveguide (23) and suppress the temperature rise of the electronic component (MMIC chip 14).

In the radar device (1) according to this embodiment, the thickness of the metal film (28) of the heat transfer path (R2) and the heat dissipation path (R3) is greater than the thickness of the metal film (28) of the shield layer (29). is largely formed.

According to this configuration, since the thickness of the metal film (28) of the heat transfer path (R2) and the heat dissipation path (R3) is large, the heat generated by the electronic component (MMIC chip 14) is effectively transferred to the metal film (28). can escape.

In the radar device (1) according to this embodiment, the metal film (28) is made of metal containing at least one of silver, copper, gold, nickel, and tin.

According to this configuration, the metal film (28) can be formed from a metal having high thermal conductivity and shielding properties.

A radar device (1) according to this embodiment includes a substrate (10) having an electronic component (MMIC chip 14) arranged on one main surface (11), and one main surface (11) of the substrate (10). A radar device (1) comprising: a resin horn (20) arranged on the substrate (10); The outer surface of the horn (20) is covered with a metal film (28), and the metal film (28) of the horn (20) forms a heat dissipation path (R3 ) is formed.

According to this configuration, the heat generated by the electronic component (MMIC chip 14) is released to the horn (20) and the heat radiation member (heat radiation plate 40), so that the temperature rise of the electronic component (MMIC chip 14) can be suppressed.

Although the embodiments of the present invention have been described in detail above, the present invention is not limited to the above-described embodiments, and various designs can be made without departing from the spirit of the invention described in the claims. Changes can be made. For example, the above-described embodiments have been described in detail in order to explain the present invention in an easy-to-understand manner, and are not necessarily limited to those having all the described configurations. Also, part of the configuration of one embodiment can be replaced with the configuration of another embodiment, and the configuration of another embodiment can be added to the configuration of one embodiment. Furthermore, it is possible to add, delete, or replace part of the configuration of each embodiment with another configuration.

1 radar device 10 substrate 11 one main surface 12 the other main surface 13 antenna 14 MMIC chip (electronic component)
20 Horn 23 Waveguide 26 Wall surface 28 of horn Metal film 29 Shield layer 40 Radiator plate (heat radiation member)
45 base (heat dissipation member)
R2 Heat transfer path R3 Heat dissipation path

Claims (7)

A radar device comprising a substrate provided with an antenna on one principal surface and a resin horn arranged on one principal surface of the substrate,
The horn is formed with a waveguide at a position corresponding to the antenna, the waveguide becoming wider as the distance from one main surface of the substrate increases,
A shield layer is formed of a metal film on a wall surface of the horn that forms the waveguide ,
An electronic component connected to the antenna is arranged on one main surface of the substrate,
A radar apparatus according to claim 1 , wherein the horn has a heat transfer path from the electronic component to the shield layer formed of a metal film . The antennas are a plurality of antennas provided on one main surface of the substrate, and the waveguides are a plurality of waveguides formed at positions corresponding to the plurality of antennas of the horn. The radar device according to claim 1. A heat dissipation member provided on the other main surface of the substrate,
2. The radar apparatus according to claim 1 , wherein the horn has a heat radiation path from the electronic component to the heat radiation member formed of a metal film. The shield layer is formed of a metal film having higher shielding properties than the heat transfer path and the heat dissipation path, and the heat transfer path and the heat dissipation path are formed of a metal film having higher thermal conductivity than the shield layer. The radar device according to claim 3 , characterized by: 4. The radar device according to claim 3 , wherein the thickness of the metal film of the heat transfer path and the heat radiation path is formed larger than the thickness of the metal film of the shield layer. 6. The radar device according to any one of claims 1 to 5 , wherein the metal film is made of metal containing at least one of silver, copper, gold, nickel, and tin. A radar comprising a substrate on which electronic components are arranged on one main surface, a resin horn arranged on one main surface of the substrate, and a heat radiating member arranged on the other main surface of the substrate a device,
A radar apparatus according to claim 1, wherein an outer surface of the horn is covered with a metal film, and the metal film of the horn forms a heat radiation path from the electronic component to the heat radiation member.

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