Electromagnetic wave transparent cover

Abstract

To provide a technology capable of efficiently heating a design part in an electromagnetic wave transmission cover that comprises a design part, a heating element installed integrally with the design part, and a housing.SOLUTION: Provided is an electromagnetic wave transmission cover 1 comprising: a design part 2 located on a front side of an electromagnetic wave device 8 for a vehicle, which is exposed to the outside of the vehicle interior; a housing 4 integrated to the design part 2 and located on a rear side of the design part 2; and a heating element 3 which is installed integrally with the design part 2. Therein, a coefficient of thermal conductivity of the housing 4 is reduced to be lower than a coefficient of thermal conductivity of the design part 2. Furthermore, in an electromagnetic wave transmission cover comprising: a design part 2 located on a front side of an electromagnetic wave device 8 for a vehicle, which is exposed to the outside of the vehicle interior; a housing 4 located on the reverse side of the design part 2; an intermediate member 5 integrated with the design part 2 and the housing 4 and interposed between the design part 2 and the housing 4; and a heating element 3 which is installed integrally with the design part 2. Therein, a coefficient of thermal conductivity of the intermediate member 5 is reduced to be lower than a coefficient of thermal conductivity of the housing 4.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to an electromagnetic wave transparent cover including a design portion arranged on the front side of an electromagnetic wave device for a vehicle. [Background technology]

[0002] 2. Description of the Related Art In recent years, vehicle driving assistance systems have been actively developed, and various vehicle electromagnetic wave devices used in the driving systems are attached to vehicles.

[0003] LiDAR (Light Detection and Ranging), which is one type of electromagnetic wave device for vehicles, is a remote sensing technology that uses light and is used in driving assistance systems. LiDAR uses a laser to emit light with a relatively short wavelength toward the target and detects the light that is reflected off the target. Among LiDARs, those that use near-infrared sensing are advantageous for detecting obstacles at relatively close ranges.

[0004] Other electromagnetic wave devices for vehicles include electromagnetic wave radar devices such as millimeter wave radar and laser radar, which are used for adaptive cruise control (ACC) of the vehicle. ACC is a technology that uses a sensor mounted on the front of the vehicle to measure driving information such as the distance between the vehicle ahead and the vehicle itself and the relative speed, and controls the throttle and brakes based on this driving information to accelerate and decelerate the vehicle, thereby controlling the distance between the vehicles. In recent years, ACC has been attracting attention as one of the core technologies of Intelligent Transport Systems (ITS), which aim to ease congestion and reduce accidents. Millimeter wave radar, a type of electromagnetic wave radar device, transmits millimeter waves with frequencies of 30 GHz to 300 GHz and wavelengths of 1 to 10 mm, and receives millimeter waves reflected by objects. The difference between the transmitted and received waves can be used to calculate the distance between the vehicle ahead and the vehicle itself and the relative speed.

[0005] The emission unit and detection unit in the various vehicle electromagnetic wave devices described above are mounted on the outermost side of the vehicle (i.e., the front end side, side end side, rear end side, etc.). If the emission unit and detection unit are visible from outside the vehicle, the design of the vehicle will be impaired, so it is common to provide a design unit that covers the emission unit and detection unit on the outer side thereof.

[0006] The design portion is a portion that is exposed to the outside of the vehicle cabin, is disposed on the electromagnetic wave path of the vehicle electromagnetic wave device, and allows the electromagnetic waves to pass therethrough. Here, since the design part is exposed to the outside of the vehicle cabin, frost may form on the design part in cold weather, and snow may accumulate on the design part in snowfall. If the design part is covered with frost or snow, the sensing function of the electromagnetic wave device for a vehicle located on the back side, i.e., the rear side, and the communication function of the communication device in the electromagnetic wave device for a vehicle may be impaired.

[0007] Patent Document 1 introduces an invention related to an electromagnetic wave transparent cover for covering an infrared sensor, which is a type of electromagnetic wave device for vehicles. The electromagnetic wave transparent cover introduced in Patent Document 1 is an infrared sensor cover 4, which includes a cover base material 5 provided on the path of infrared rays transmitted and received by an infrared sensor 3, and a heater wire 8 provided on the surface of the cover base material 5 and generating heat when electricity is applied. Of these, the cover base material 5 is considered to correspond to the above-mentioned design part. With this type of electromagnetic wave transparent cover, the heater wire 8, i.e., the heating element, generates heat to warm the cover base material 5, i.e., the design part, making it possible to melt the frost and snow covering the design part. It is also considered that this can suppress the inhibition of the sensing function and communication function of the electromagnetic wave device for vehicles caused by frost and snow. [Prior art documents] [Patent documents]

[0008] [Patent Document 1] JP 2020-165943 A Summary of the Invention [Problem to be solved by the invention]

[0009] As mentioned above, in the electromagnetic wave transparent cover introduced in Patent Document 1, a heating element that is integrally provided with the design part generates heat, and the design part is directly heated by thermal conduction from the heating element. This makes it possible to melt the frost covering the design part, and to suppress various adverse effects caused by the frost.

[0010] In recent years, vehicles are equipped with various on-board devices, and there is a demand for reducing the amount of power consumed by each on-board device. In particular, in electric vehicles and hybrid vehicles, which have become popular in recent years, it is desirable to reduce the amount of power consumed by the on-board devices in order to ensure a sufficient driving distance after charging. The inventors of the present invention have conducted extensive research to achieve energy savings in vehicle-mounted equipment, and in the process have noticed that in an electromagnetic wave transparent cover having an integrated heating element such as that introduced in Patent Document 1, some of the heat generated by the heating element may be lost and not be used to heat the electromagnetic wave transparent cover. That is, in the electromagnetic wave transparent cover introduced in Patent Document 1, the heat conducted from the heating element to the design part is further conducted to the housing, specifically to the case for housing the infrared sensor as described in the examples of Patent Document 1. This may result in the time required to heat the design part to a sufficient temperature and the amount of heat required to heat the design part to a sufficient temperature increasing more than necessary.

[0011] The present invention has been made in consideration of the above-mentioned circumstances, and aims to provide a technology that can efficiently heat a design part in an electromagnetic wave transparent cover that has a design part, a heating element that is integral with the design part, and a housing. [Means for solving the problem]

[0012] The electromagnetic wave transparent cover of the first aspect of the present invention that solves the above problem is as follows: The electromagnetic wave device for a vehicle includes a design part that is disposed on a front side of the electromagnetic wave device for a vehicle and is exposed to the outside of the vehicle cabin, a housing that is integrated with the design part and disposed on a rear side of the design part, and a heating element that is provided integrally with the design part, The housing is an electromagnetic wave transparent cover, and the thermal conductivity of the housing is lower than the thermal conductivity of the design portion.

[0013] In addition, the electromagnetic wave transmission cover according to the second aspect of the present invention, which solves the above problem, is The electromagnetic wave device for a vehicle includes a design part that is disposed on a front side of the electromagnetic wave device for a vehicle and is exposed to the outside of the vehicle cabin, a housing that is disposed on a rear side of the design part, an intermediate member that is integrated with the design part and the housing and is interposed between the design part and the housing, and a heating element that is provided integrally with the design part, The intermediate member is an electromagnetic wave transparent cover having a thermal conductivity lower than that of the housing. Effect of the Invention

[0014] The electromagnetic wave transparent cover of the present invention is an electromagnetic wave transparent cover comprising a design portion, a heating element provided integrally with the design portion, and a housing, and is capable of efficiently heating the design portion. [Brief description of the drawings]

[0015] [Figure 1] 1 is an explanatory diagram illustrating a schematic diagram of an electromagnetic wave transmission cover according to a first embodiment. [Diagram 2] 2 is an explanatory diagram illustrating a schematic view of the electromagnetic wave transmission cover of the first embodiment after it has been cut. FIG. [Diagram 3] 10 is an explanatory diagram illustrating a schematic view of the electromagnetic wave transmission cover of Example 2 after being cut. FIG. [Figure 4] 11 is an explanatory diagram illustrating a schematic view of the electromagnetic wave transmission cover of Example 3 when cut. FIG. [Diagram 5] 11 is an explanatory diagram showing a schematic view of the electromagnetic wave transmission cover of Example 4 after being cut. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] Hereinafter, the embodiment of the present invention will be described. Unless otherwise specified, the numerical range "a to b" described in this specification includes the lower limit a and the upper limit b. These upper and lower limit values, as well as the numerical values ​​listed in the examples, can be arbitrarily combined to form a numerical range. Furthermore, a numerical value arbitrarily selected from within these numerical ranges can be used as a new upper or lower limit numerical value.

[0017] In the electromagnetic wave transparent cover of the first embodiment of the present invention, the housing is integrated with the design part and is arranged on the back side of the design part. In other words, in the electromagnetic wave transparent cover of the first embodiment, heat generated by the heating element and conducted to the design part can be conducted to the housing integrated with the design part via the design part. However, in the electromagnetic wave transparent cover of the first embodiment, the thermal conductivity of the housing is lower than that of the design part, so heat conduction from the design part to the housing is inhibited. As a result, with the electromagnetic wave transparent cover of the first embodiment, the design part can be efficiently heated by the heat generated by the heating element.

[0018] In addition, in the electromagnetic wave transparent cover of the second aspect of the present invention, which solves the above problems, an intermediate member is interposed between the design part and the housing. Therefore, in the electromagnetic wave transparent cover of the second aspect, heat generated by the heating element and conducted to the design part can be conducted to the intermediate member before being conducted to the housing. Here, in the electromagnetic wave transparent cover of the second aspect, the thermal conductivity of the intermediate member is lower than that of the housing, so that heat conduction from the design part to the housing through the intermediate member is inhibited. As a result, the electromagnetic wave transparent cover of the second aspect also allows the design part to be efficiently heated by the heat generated by the heating element.

[0019] Hereinafter, the electromagnetic wave transmission cover of the present invention will be described in detail for each of its components. In this specification, when the electromagnetic wave transmission cover of the present invention is referred to without any particular explanation, it is a general term for the electromagnetic wave transmission cover of the first embodiment and the electromagnetic wave transmission cover of the second embodiment.

[0020] The design portion of the electromagnetic wave transmission cover of the present invention is disposed on the front side of the electromagnetic wave device for a vehicle and is exposed to the outside of the vehicle cabin. The design portion can be said to be on the electromagnetic wave path of the electromagnetic wave device for a vehicle. The electromagnetic wave device for a vehicle is not particularly limited as long as it has an emission unit for emitting electromagnetic waves and / or a detection unit for receiving electromagnetic waves. The type of electromagnetic waves is also not particularly limited.

[0021] Specific examples of electromagnetic wave devices for vehicles include radar devices such as the above-mentioned LiDAR, millimeter wave radar, and laser radar, camera devices such as digital cameras and optical cameras, and foot sensors for opening and closing doors.

[0022] The electromagnetic waves may be any waves that can be emitted and / or received by the various vehicle electromagnetic wave devices described above, and examples of such electromagnetic waves include infrared rays, millimeter waves, laser waves, and visible light of various wavelengths.

[0023] The design portion in the electromagnetic wave transmission cover of the present invention may be made of any material as long as it can transmit electromagnetic waves originating from the vehicle electromagnetic wave device. However, any material that can transmit electromagnetic waves may be selected.

[0024] Considering that the electromagnetic wave transmission cover of the present invention will be mounted on a vehicle, it is preferable to select as the material of the design part a resin such as polycarbonate (PC), acrylic resin, polypropylene (PP), etc. The design part may have a single-layer structure, but may also have a multi-layer structure in which a design layer capable of displaying various designs by painting, printing, metal deposition, etc., or a coating layer that coats the design layer or the design part itself, etc., are formed on a base layer.

[0025] A heating element is integrally provided with the design portion. A common heating element such as a heater wire may be used as the heating element. In the electromagnetic wave transparent cover of the present invention, the mechanism by which the heating element generates heat is not particularly important, but since the vehicle exterior part of the present invention is mounted on a vehicle, the heating element preferably has a simple structure, and is particularly preferably one that generates heat by receiving a power supply.

[0026] The heating element may be integrated into the design portion by a method such as adhesion or welding, or may be integrated into the design portion when the design portion is molded by a method such as insert molding. The heating element may be integrated into any part of the design portion, for example, into the back surface of the design portion or into the side surface of the design portion. In some cases, the heating element may be integrated into the surface of the design portion.

[0027] The housing is the portion of the electromagnetic wave transmission cover of the present invention that is disposed behind the design portion. In the electromagnetic wave transmission cover of the present invention, the shape of the housing is not particularly limited. For example, the housing may be in a box shape capable of housing the vehicle electromagnetic wave device, or in a frame shape covering at least a part of the vehicle electromagnetic wave device.

[0028] In the radio wave transmission cover of the first aspect of the present invention, the housing is integrated with the design portion.

[0029] In the radio wave transmission cover of the first embodiment, the thermal conductivity of the housing is lower than that of the design part. Any method may be used to make the thermal conductivity of the housing lower than that of the design part. For example, the material of the housing may have a lower thermal conductivity than the material of the design part. Alternatively, the material of the housing may be the same as the material of the design part, and only the housing may be provided with a heat insulating part such as an air bubble or an air layer.

[0030] In the radio wave transmission cover of the first embodiment, the difference in thermal conductivity between the design part and the housing is not particularly limited. Preferable examples of the difference in thermal conductivity between the design part and the housing in the radio wave transmission cover of the first embodiment include ranges of 0.01 W / (m·K) or more, 0.03 W / (m·K) or more, 0.05 W / (m·K) or more, 0.75 W / (m·K) or more, or 0.1 W / (m·K) or more. There is no upper limit to the difference in thermal conductivity between the design part and the housing, and if forced to do so, an example would be 100 W / (m·K) or less.

[0031] As a suitable combination of the material of the design portion and the material of the housing in the radio wave transmission cover of the first embodiment, for example, when polycarbonate is selected as the material of the design portion, it is preferable to select polyethylene terephthalate, polypropylene, expanded polystyrene, ABS resin, or butyl rubber as the material of the housing.

[0032] In contrast, in the radio wave transmission cover of the second embodiment of the present invention, the housing is integrated with the intermediate member, and is integrated with the design portion via the intermediate member.

[0033] In the radio wave transmission cover of the second embodiment, the thermal conductivity of the intermediate member is lower than that of the housing. Any method may be used to make the thermal conductivity of the intermediate member lower than that of the housing. As in the radio wave transmission cover of the first embodiment, the material of the intermediate member may have a lower thermal conductivity than the material of the housing. Alternatively, the material of the intermediate member may be the same as the material of the housing, and only the intermediate member may be provided with a heat insulating portion such as an air bubble or an air layer. Also, the intermediate member may be selected to have an adhesive function such as an adhesive or double-sided tape.

[0034] In the radio wave transmission cover of the second embodiment, the difference in thermal conductivity between the intermediate member and the housing is not particularly limited. Preferable examples of the difference in thermal conductivity between the intermediate member and the housing in the radio wave transmission cover of the second embodiment include ranges of 0.01 W / (m·K) or more, 0.03 W / (m·K) or more, 0.05 W / (m·K) or more, 0.75 W / (m·K) or more, or 0.1 W / (m·K) or more. There is no upper limit to the difference in thermal conductivity between the housing and the design part, and a maximum of 300 W / (m·K) can be exemplified.

[0035] In the radio wave transmission cover of the second embodiment, the thermal conductivity of the intermediate part may be lower than that of the design part, or may be higher than that of the design part. In either case, if the thermal conductivity of the intermediate part is lower than that of the housing, the conduction of heat from the intermediate part to the housing can be suppressed. It is preferable that the thermal conductivity of the intermediate part is lower than that of the design part. In this way, not only the thermal conduction from the intermediate part to the housing but also the thermal conduction from the design part to the intermediate part can be suppressed, and the design part can be heated more efficiently.

[0036] Furthermore, the greater the thickness of the intermediate member, i.e., the length of the intermediate member between the design portion and the housing, the more effectively the intermediate member can block or suppress heat conduction from the design portion to the housing, and the more pronounced the effects of the intermediate member described above become. Preferable ranges for the thickness of the intermediate member include 20 μm or more, 50 μm or more, 1 mm or more, 5 mm or more, 10 mm or more, and 12 mm or more. There is no upper limit to the thickness of the intermediate member, but it is practical to set it to 100 mm or less.

[0037] As a suitable combination of the housing material and the intermediate member material in the radio wave transmission cover of the second embodiment, for example, when aluminum is selected as the housing material, it is preferable to select polyethylene terephthalate, polypropylene, expanded polystyrene, ABS resin, or butyl rubber as the intermediate member material.

[0038] The thermal conductivity can be measured by any known method, provided that the same method is used to measure the thermal conductivity of each portion of the same electromagnetic wave transparent cover.

[0039] The electromagnetic wave transmission cover of the present invention may or may not include a vehicle electromagnetic wave device. For example, when a vehicle electromagnetic wave device is disposed inside a housing, it is preferable that the electromagnetic wave transmission cover of the present invention includes a vehicle electromagnetic wave device.

[0040] The electromagnetic wave transparent cover of the present invention will be described below with reference to specific examples.

[0041] Example 1 The electromagnetic wave transparent cover of Example 1 is equipped with a LiDAR as an electromagnetic wave device for a vehicle, and is the electromagnetic wave transparent cover of the first embodiment of the present invention. Fig. 1 is an explanatory diagram that typically illustrates the electromagnetic wave transparent cover of Example 1. Fig. 2 is an explanatory diagram that typically illustrates the electromagnetic wave transparent cover of Example 1 in a cut state. Hereinafter, the terms "front", "back", "up", "down", "left" and "right" refer to the front, back, top, bottom, left and right shown in each drawing. For reference, the front side corresponds to the front side in the vehicle travel direction, and the back side corresponds to the rear side in the vehicle travel direction.

[0042] As shown in FIG. 1, the electromagnetic wave transparent cover 1 of the first embodiment includes a design portion 2, a heating element 3, a housing 4, and an electromagnetic wave device 8 for a vehicle.

[0043] The design portion 2 is made of resin and has a generally plate-like shape. The design portion 2 has a base (not shown) made of PC and a hard coat layer (not shown) formed on the surface thereof.

[0044] As shown in Fig. 2, a heating element 3 is integrated into the design portion 2. The heating element 3 is made of a heater wire and is placed on the back side of the design portion 2. The heating element 3 is connected to a power source (not shown) and generates heat when it receives power from the power source.

[0045] The box-shaped housing 4 is located on the back side of the design part 2. The housing 4 is integrated with the design part 2 with its opening facing the front. The housing 4 is made of PP, which has a lower thermal conductivity than the design part 2. The difference in thermal conductivity between the design part 2 and the housing 4 is about 0.07 W / (m K).

[0046] A LiDAR serving as a vehicle electromagnetic wave device 8 is housed inside the housing 4. The vehicle electromagnetic wave device 8 emits infrared rays serving as electromagnetic waves toward the front side, and receives infrared rays incident from the front side.

[0047] The design portion 2 is disposed on the front side of the vehicle electromagnetic wave device 8. Therefore, the design portion 2 is on the electromagnetic wave path of the vehicle electromagnetic wave device 8. Furthermore, the design portion 2 is capable of transmitting infrared rays as electromagnetic waves.

[0048] The heat generated by the heating element 3 is first conducted to the design portion 2 which is integrated with the heating element 3. The heat is then conducted to the housing 4 which is integrated with the design portion 2.

[0049] Here, according to the electromagnetic wave transparent cover 1 of Example 1, the thermal conductivity of the housing 4 is lower than that of the design part 2. For this reason, the speed at which heat is conducted from the design part 2 to the housing 4 is slower than when, for example, the thermal conductivity of the housing 4 is higher than that of the design part 2 or when the thermal conductivity of the housing 4 is the same as that of the design part 2. This suppresses the thermal conduction from the design part 2 to the housing 4. Therefore, according to the electromagnetic wave transparent cover 1 of Example 1, it is possible to efficiently heat the design part 2 while suppressing heat loss.

[0050] Example 2 The electromagnetic wave transparent cover of Example 2 is an electromagnetic wave transparent cover of the second aspect of the present invention, and is generally the same as the electromagnetic wave transparent cover of Example 1, except for the intermediate member interposed between the design portion and the housing and the material of the housing. Therefore, the electromagnetic wave transparent cover of Example 2 will be described below, focusing on the differences from the electromagnetic wave transparent cover of Example 1. FIG. 3 is an explanatory diagram that illustrates a schematic view of the electromagnetic wave transmission cover of the second embodiment when cut.

[0051] 3, in the electromagnetic wave transparent cover of Example 2, an intermediate member 5 is interposed between the design portion 2 and the housing 4. In the electromagnetic wave transparent cover of Example 2, the intermediate member 5 is a rubber-based adhesive, and is integrated with the design portion 2 and the housing 4. The thermal conductivity of the intermediate member 5 is lower than that of the design portion 2.

[0052] In the radio wave transmission cover of Example 2, the thickness of the intermediate member 5, that is, the length of the intermediate member 5 between the design portion 2 and the housing 4, is about 5 mm.

[0053] In the radio wave transmission cover of the second embodiment, the housing 4 is made of aluminum, which has a higher thermal conductivity than the design portion 2 and the intermediate member 5 .

[0054] The heat generated by the heating element 3 is first conducted to the design portion 2 that is integrated with the heating element 3. In the electromagnetic wave transparent cover 1 of the second embodiment, the heat conducted to the design portion 2 is first conducted to the intermediate member 5 interposed between the design portion 2 and the housing 4. The heat conducted to the intermediate member 5 is then conducted to the housing 4.

[0055] The thermal conductivity of the intermediate member 5 is lower than that of the housing 4. Therefore, heat conduction from the intermediate member 5 to the housing 4 is suppressed. Furthermore, in the radio wave transparent cover of Example 2, the thermal conductivity of the intermediate member 5 is lower than that of the design portion 2. Therefore, in the radio wave transparent cover of Example 2, heat conduction from the design portion 2 to the intermediate member 5 is also suppressed. As a result, the electromagnetic wave transparent cover 1 of the second embodiment also makes it possible to efficiently heat the design portion 2 while suppressing heat loss.

[0056] Example 3 The electromagnetic wave transparent cover of Example 3 is an electromagnetic wave transparent cover of the second aspect of the present invention, and other than the material of the housing, is generally the same as the electromagnetic wave transparent cover of Example 2. Therefore, hereinafter, the electromagnetic wave transparent cover of Example 3 will be described, focusing on the differences from the electromagnetic wave transparent cover of Example 2. FIG. 4 is an explanatory diagram that illustrates a schematic view of the electromagnetic wave transmission cover of the third embodiment when it is cut.

[0057] 4, in the electromagnetic wave transparent cover 1 of Example 3, the front side of the housing 4, i.e., the portion on the intermediate member 5 side, is made of a material different from the back side of the housing 4. Specifically, the front side of the housing 4 is made of PC like the design portion 2, and the back side of the housing 4 is made of aluminum like the housing 4 of Example 2. The front side of the housing 4 is referred to as housing peripheral portion 41, and the back side of the housing 4 is referred to as housing general portion 42.

[0058] The thermal conductivity of the housing peripheral portion 41 is the same as that of the design portion 2, but the thermal conductivity of the entire housing 4, including the housing peripheral portion 41 and the housing general portion 42, is much higher than the thermal conductivity of the design portion 2.

[0059] The thermal conductivity of the intermediate member 5 is lower than that of the housing peripheral portion 41, the housing general portion 42, and the housing 4 as a whole. In addition, the thermal conductivity of the intermediate member 5 is lower than that of the design portion 2. In the electromagnetic wave transmission cover 1 of the third embodiment, the thickness of the intermediate member 5 is about 5 mm.

[0060] In the electromagnetic wave transparent cover 1 of Example 3 as well, the thermal conductivity of the intermediate member 5 is lower than that of the housing 4. Therefore, heat conduction from the intermediate member 5 to the housing 4 is suppressed. In the electromagnetic wave transparent cover of Example 3 as well, the thermal conductivity of the intermediate member 5 is lower than that of the design portion 2. Therefore, in the electromagnetic wave transparent cover of Example 3 as well, heat conduction from the design portion 2 to the intermediate member 5 is suppressed. Therefore, the electromagnetic wave transmission cover 1 of the third embodiment also makes it possible to efficiently heat the design portion 2 while suppressing heat loss.

[0061] Example 4 The electromagnetic wave transparent cover of Example 4 is an electromagnetic wave transparent cover of the second aspect of the present invention, and other than the material of the housing, is generally the same as the electromagnetic wave transparent cover of Example 2. Therefore, hereinafter, the electromagnetic wave transparent cover of Example 4 will be described, focusing on the differences from the electromagnetic wave transparent cover of Example 2. FIG. 5 is an explanatory diagram that illustrates a schematic view of the electromagnetic wave transmission cover of the fourth embodiment after it has been cut.

[0062] 5, the electromagnetic wave transmission cover 1 of the fourth embodiment employs a frame-shaped or short-tube-shaped member as the intermediate member 5. The intermediate member 5 has an opening facing the front-rear direction. The intermediate member 5 is made of PP, which has a lower thermal conductivity than the housing 4 and the design portion 2. In the electromagnetic wave transmission cover 1 of the fourth embodiment, the thickness of the intermediate member 5, that is, the length of the intermediate member 5 between the design portion 2 and the housing 4, is about 30 mm.

[0063] In the electromagnetic wave transparent cover 1 of Example 4 as well, the thermal conductivity of the intermediate member 5 is lower than that of the housing 4. Therefore, heat conduction from the intermediate member 5 to the housing 4 is suppressed. In the electromagnetic wave transparent cover of Example 4 as well, the thermal conductivity of the intermediate member 5 is lower than that of the design portion 2. Therefore, heat conduction from the design portion 2 to the intermediate member 5 is suppressed in the electromagnetic wave transparent cover of Example 4 as well. Therefore, the electromagnetic wave transmission cover 1 of the fourth embodiment also makes it possible to efficiently heat the design portion 2 while suppressing heat loss.

[0064] The present invention is not limited to the embodiment described above and shown in the drawings, and can be modified and implemented as appropriate without departing from the scope of the present invention. Furthermore, each component shown in this specification, including the embodiment, can be arbitrarily extracted and combined for implementation. [Explanation of symbols]

[0065] 1: Electromagnetic wave transparent cover 2: Design Department 3: Heating element 4: Housing 5: Intermediate part 8: Electromagnetic wave device for vehicles

Claims

1. The electromagnetic wave device for a vehicle includes a design part that is disposed on a front side of the electromagnetic wave device for a vehicle and is exposed to the outside of the vehicle cabin, a housing that is integrated with the design part and disposed on a rear side of the design part, and a heating element that is provided integrally with the design part, the housing has a thermal conductivity lower than that of the design portion, The heating element is wired from the center to the upper part of the design portion, an electromagnetic wave transparent cover.

2. 2. The electromagnetic wave transparent cover according to claim 1, wherein a difference between the thermal conductivity of the housing and the thermal conductivity of the design portion is 0.01 W / (m·K) or more.

3. The electromagnetic wave device for a vehicle includes a design part that is disposed on a front side of the electromagnetic wave device for a vehicle and is exposed to the outside of the vehicle cabin, a housing that is disposed on a rear side of the design part, an intermediate member that is integrated with the design part and the housing and is interposed between the design part and the housing, and a heating element that is provided integrally with the design part, the intermediate member has a thermal conductivity lower than that of the design portion; The heating element is wired from the center to the upper part of the design portion, an electromagnetic wave transparent cover.

4. 4. The electromagnetic wave transparent cover according to claim 3, wherein a difference between the thermal conductivity of the intermediate member and the thermal conductivity of the housing is 0.01 W / (m·K) or more.

5. 5. The electromagnetic wave transmission cover according to claim 3, wherein the intermediate member has a thickness of 20 [mu]m or more.

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