Electromagnetic wave transparent cover

Abstract

To provide a technology capable of heating an electromagnetic wave transmission cover efficiently while securing the freedom of a shape.SOLUTION: Provided is an electromagnetic wave transmission cover 1 which is located on a front side of an electromagnetic wave device 8 for a vehicle. and comprises: a base substance 2 that includes, in an electromagnetic wave path of the electromagnetic wave device 8 for a vehicle, a design part 25 that is exposed to the outside of a vehicle interior; and a heat conduction part 5, which has electro-thermal conductivity higher than the base substance 2 and causes a heat source 85 located on a rear side of the design part 25 to thermally communicate with the design part 25. The heat conduction part 5 has a plurality of heat conduction paths that each include: a conduction base part which is a part on the heat source 85 side; and a conduction end part which is a part on the design part 25 side and communicates with the conduction base part. The conduction end parts are each connected to the design part 25 at different positions.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to an electromagnetic wave transparent cover to be placed 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 an electromagnetic wave transparent cover that covers the emission unit and detection unit on the outer side thereof.

[0006] The electromagnetic wave transparent cover has a design portion that is exposed to the outside of the vehicle cabin. The design portion is disposed on the electromagnetic wave path of the electromagnetic wave device for a vehicle. 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 behind the design part 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 in-vehicle radar device, which is a type of in-vehicle radio wave device. The in-vehicle radar device introduced in Patent Document 1 transmits radiant heat generated by heat sources 3a, 3b via reflectors 4a, 4b to an emblem 1, which is a type of electromagnetic wave-transmitting cover, to heat the emblem 1. This type of in-vehicle radio wave device is capable of heating and melting frost on the electromagnetic wave-transmitting cover, which is thought to suppress the impairment of sensing functions, communication functions, etc., caused by frost. [Prior art documents] [Patent documents]

[0008] [Patent Document 1] Patent Publication No. 2021-85840 Summary of the Invention [Problem to be solved by the invention]

[0009] The vehicle radio wave device introduced in the above-mentioned Patent Document 1 reflects infrared rays generated by a heat source with a reflector, and heats the electromagnetic wave transmission cover using radiant heat due to the infrared rays. This type of heating mechanism has a problem of being relatively inferior in thermal efficiency compared to a case where heat generated by a heat source is directly supplied to the radio wave transmission cover, and also has a problem of requiring separate power for the heat source, such as electricity. Furthermore, since other members that block infrared rays cannot be arranged between the heat source and the reflector, and between the reflector and the electromagnetic wave transmission cover, there is also a problem of the degree of freedom of the shape of the electromagnetic wave transmission cover being impaired. In addition, for example, if the vehicle electromagnetic wave device performs sensing using infrared rays such as LiDAR, there is a risk that the infrared rays generated by the heat source will interfere with the sensing by the vehicle electromagnetic wave device.

[0010] The present invention has been made in consideration of the above circumstances, and has an object to provide a technique that can efficiently heat an electromagnetic wave transparent cover while ensuring freedom of shape. [Means for solving the problem]

[0011] The electromagnetic wave transmission cover of the present invention that solves the above problems is as follows: An electromagnetic wave transparent cover arranged on a front side of a vehicle electromagnetic wave device, a base having a design portion exposed to the outside of a vehicle cabin on an electromagnetic wave path of the vehicle electromagnetic wave device; a heat conductive portion having a higher thermoelectric conductivity than the base and thermally connecting the base to a heat source disposed on the rear side of the design portion; The heat conduction portion has a plurality of heat conduction paths including a conductive base portion that is a portion on the heat source side and a conductive end portion that is a portion on the design portion side and is connected to the conductive base portion, Each of the conductive ends is an electromagnetically transparent cover that is connected to the design portion at a different location. Effect of the Invention

[0012] According to the electromagnetic wave transmission cover of the present invention, the design portion of the electromagnetic wave transmission cover can be efficiently heated while ensuring freedom of shape. [Brief description of the drawings]

[0013] [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] 2 is an explanatory diagram illustrating a schematic view of the electromagnetic wave transmission cover of the first embodiment as viewed from the front side. FIG. [Figure 4] 2 is an explanatory diagram illustrating a schematic view of the electromagnetic wave transmission cover of the first embodiment as viewed from above. FIG. [Diagram 5] 10 is an explanatory diagram illustrating a schematic diagram of an electromagnetic wave transmission cover according to a second embodiment. FIG. [Figure 6] FIG. 6 is an explanatory diagram that illustrates the electromagnetic wave transmission cover of the second embodiment as viewed from the front side. [Figure 7] 11 is an explanatory diagram illustrating a schematic view of an electromagnetic wave transmission cover according to a second embodiment as viewed from above. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] 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.

[0015] The electromagnetic wave transparent cover of the present invention comprises a base body having a design portion exposed to the outside of the vehicle cabin on the electromagnetic wave path of an electromagnetic wave device for a vehicle. In the electromagnetic wave transmission cover of the present invention, the design part provided on the base is a part that is exposed to the outside of the vehicle cabin on the electromagnetic wave path of the vehicle electromagnetic wave device, that is, the design part is a part that may be covered with frost and snow and may cause the sensing function, communication function, etc. to be hindered due to frost and snow.

[0016] The electromagnetic wave transmission cover of the present invention includes, in addition to the base described above, a heat conductive part having a higher thermoelectric conductivity than the base. The heat conductive part thermally connects the base and a heat source disposed on the back side of the design part of the base. In other words, the design part of the base in the electromagnetic wave transmission cover of the present invention is indirectly heated by the heat source disposed on the back side of the design part via the heat conductive part. Therefore, according to the electromagnetic wave transmission cover of the present invention, the heat of the heat source can be conducted to the design part with relatively high thermal efficiency, and frost and snow adhering to the design part can be efficiently melted.

[0017] Here, the heat conduction part has a plurality of heat conduction paths including a conductive base part which is a part on the heat source side and a conductive end part which is a part on the design part side and connects to the conductive base part. Each conductive end part is connected to a different position on the design part. Therefore, according to the electromagnetic wave transmission cover of the present invention, heat can be conducted separately to a plurality of positions on the design part, and the design part can be heated efficiently.

[0018] In addition, since the electromagnetic wave transmission cover of the present invention heats the design portion by thermal conduction, there are no particular limitations on the positional relationship between the heat source and the design portion, or the positional relationship between the heat conductive portion and the design portion, and therefore the electromagnetic wave transmission cover of the present invention has excellent freedom in terms of shape. As described above, according to the electromagnetic wave transmission cover of the present invention, it can be said that the design portion of the electromagnetic wave transmission cover can be efficiently heated while ensuring freedom of shape.

[0019] Hereinafter, the vehicle exterior part of the present invention will be described in detail with respect to each of its constituent elements.

[0020] The electromagnetic wave transmission cover of the present invention is arranged on the front side 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 part for emitting electromagnetic waves and / or a detection part for receiving electromagnetic waves. The type of electromagnetic wave 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 electromagnetic wave transparent cover of the present invention comprises a base and a heat conductive portion. The base has a design portion. As described above, the design portion is a portion of the electromagnetic wave transmission cover that is exposed to the outside of the vehicle cabin and is disposed on the electromagnetic wave path of the vehicle electromagnetic wave device. In other words, the base covers the front side of the vehicle electromagnetic wave device with the design portion.

[0024] The base body may consist of only the design portion, or may include a portion other than the design portion. For example, the base may be a plate-like body consisting of only a substantially plate-like design portion. Alternatively, the base may be a substantially box-like body having a substantially plate-like design portion and a peripheral wall integrated with the periphery of the design portion. Furthermore, the base may be a substantially plate-like or box-like body having a substantially plate-like design portion and a general portion that is continuous with the design portion and is disposed outside the electromagnetic wave path of the vehicle electromagnetic wave device.

[0025] In either case, the design portion is a portion of the base of the electromagnetic wave transparent cover that is exposed to the outside of the vehicle cabin, and therefore is a portion to which frost and snow may adhere. Also, the design portion is a portion that is disposed on the electromagnetic wave path, and therefore is a portion to which frost and snow may impair the electromagnetic wave transmission performance.

[0026] There is no particular restriction on the material of the base, but for the design portion of the base, a material that can transmit electromagnetic waves should be selected.

[0027] 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 base a resin such as polycarbonate (PC), acrylic resin, polypropylene (PP), etc. A design layer capable of displaying various designs may be formed on the base including the design portion by painting, printing, metal deposition, etc.

[0028] The heat conductive portion has a higher thermoelectric conductivity than the base body, and thermally connects the heat source and the design portion.

[0029] The material of the heat conductive portion may be appropriately selected in consideration of the relationship of thermal conductivity with the base. Suitable materials for the heat conductive portion include metals such as aluminum, and composite materials in which powder of a material with excellent thermal conductivity such as aluminum or copper is mixed as a filler into a resin.

[0030] The heat conducting part may be a hollow heat pipe that holds a working fluid inside. In this case, the composition of the working fluid and the internal structure of the heat conducting part may be appropriately selected from those generally known as heat pipes. Also in this case, the heat conducting part, i.e., the pipe part of the heat pipe, may have a higher thermal conductivity than the base.

[0031] The thermally conductive portion only needs to thermally connect the heat source and the design portion, and may be in contact with the heat source and / or the design portion, or may not be in contact with either the heat source or the design portion. In consideration of reducing heat loss, the heat conductive portion is preferably in contact with either the heat source or the design portion, and more preferably in contact with both the heat source and the design portion.

[0032] The thermally conductive part may be separate from the base, or may be integrated with the base. It may be molded integrally with the base by a method such as two-color molding or insert molding. Furthermore, the thermally conductive part may be in the form of a layer that is applied, printed, or bonded to the base.

[0033] In the electromagnetic wave transmission cover of the present invention, the heat conduction part has a plurality of heat conduction paths including a conductive base part which is a part on the heat source side and a conductive end part which is an end part on the design part side and connects to the conductive base part. Each of the conductive ends is connected to the design part at a different position.

[0034] In other words, the heat conductive part in the electromagnetic wave transmission cover of the present invention conducts heat generated by the heat source to the design part through multiple paths. At this time, the design part is heated from multiple positions because the end of the heat conductive part on the design part side, i.e., the conductive end, is connected to the design part at different positions. As a result, the electromagnetic wave transmission cover of the present invention makes it possible to efficiently heat the entire design part.

[0035] In order to heat the entire design portion more efficiently, it is preferable that the conductive ends are connected to both opposing ends of the design portion. The two ends may be either the longitudinal ends or the lateral ends of the design part. In either case, by connecting the conductive ends to the opposing ends of the design part, the design part can be heated from both sides, and the entire design part can be heated efficiently.

[0036] At least one of the heat conduction paths is preferably branched into a plurality of paths, in which case one heat conduction path has a plurality of conductive ends. This allows a relatively wide area of ​​the design portion to be heated by the conductive end portion, making it possible to heat the design portion more efficiently.

[0037] In particular, when the conductive ends are connected to both ends of the design part in the short direction, it is preferable that at least one of the heat conduction paths branches into multiple paths. In this case, the portion of the design part to which the conductive ends are connected and to which heat is directly conducted from the conductive ends covers a sufficiently wide range in the longitudinal direction of the design part. This reduces the time required for the entire design part to be sufficiently heated, and the design part is heated more efficiently.

[0038] In order to heat the entire design portion more efficiently, it is preferable that adjacent conductive ends are spaced apart from each other. The distance between adjacent conductive ends may be appropriately set depending on the size and shape of the design portion, the number of conductive ends, etc., but as a specific example, the conductive ends are preferably spaced apart by 5 mm or more, more preferably 10 mm or more, and particularly preferably 30 mm or more.

[0039] The electromagnetic wave transmission cover of the present invention may or may not include an electromagnetic wave device for a vehicle. The electromagnetic wave device for a vehicle may be disposed, for example, inside a box-shaped base, or may be disposed only on the back side of a plate-shaped base.

[0040] The electromagnetic wave transmission cover of the present invention may use an element included in an electromagnetic wave device for a vehicle as a heat source. The electromagnetic wave device for a vehicle includes a heat-generating element such as a diode or an ECU. By using the element as a heat source, it is possible to heat the electromagnetic wave transmission cover with reduced energy.

[0041] Furthermore, since these elements generate heat, the electromagnetic wave device for a vehicle may be provided with a heat sink in order to prevent the electromagnetic wave device for a vehicle from being overheated by the heat. When these elements are used as the heat source in the electromagnetic wave transmission cover of the present invention, there is an advantage that the heat of the element can be conducted to the design portion, making it possible to omit a heat sink or the like for cooling the element.

[0042] In addition, when the heat source is an element of the electromagnetic wave device for a vehicle, it is preferable that the electromagnetic wave device for a vehicle is disposed inside a box-shaped base. And, it is preferable that the heat source of the electromagnetic wave device for a vehicle is in contact with or close to a heat conductive part integrated with the base. In this way, it is possible to efficiently recover the heat generated by the heat source by the heat conductive part while suppressing energy loss.

[0043] The heat source used in the electromagnetic wave transmission cover of the present invention is not limited to the above-mentioned elements of the electromagnetic wave device for vehicles. For example, it is also preferable to use as a heat source those that generate exhaust heat, such as engines and motors mounted on vehicles. It is also preferable to use such heat sources other than the elements of the electromagnetic wave device for vehicles in combination with the heat source that is the element of the electromagnetic wave device for vehicles.

[0044] The electromagnetic wave transparent cover of the present invention will be described below with reference to specific examples.

[0045] Example 1 The electromagnetic wave transparent cover of the first embodiment is equipped with a RiDAR as an electromagnetic wave device for a vehicle. Fig. 1 is an explanatory diagram that typically shows the electromagnetic wave transparent cover of Example 1. Fig. 2 is an explanatory diagram that typically shows the electromagnetic wave transparent cover of Example 1 cut away. Fig. 3 is an explanatory diagram that typically shows the electromagnetic wave transparent cover of Example 1 as viewed from the front side. Fig. 4 is an explanatory diagram that typically shows the electromagnetic wave transparent cover of Example 1 as viewed from above. 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.

[0046] As shown in FIG. 1, the electromagnetic wave transmission cover 1 of the first embodiment includes a base 2, a heat conductive portion 5, and an electromagnetic wave device 8 for a vehicle.

[0047] The base body 2 is made of resin and has a box shape. The base body 2 is molded in a state in which it is divided into a first divided body 21 which is the front side part and a second divided body 22 which is the back side part, and then assembled.

[0048] In the electromagnetic wave transparent cover 1 of the first embodiment, the design portion 25 is a plate-shaped portion located on the front side of the first divided body 21. It can also be said that the first divided body 21 has the design portion 25 and a general portion 26 other than the design portion 25, and the second divided body 22 is made of the general portion 26.

[0049] The first divided body 21 and the second divided body 22 constituting the base body 2 are made of PC, and the portion constituting the design portion 25 of these bodies is further coated with a hard coat as an upper layer.

[0050] A LiDAR serving as an electromagnetic wave device 8 for a vehicle is housed inside the base body 2. The electromagnetic wave device 8 for a vehicle emits infrared rays serving as electromagnetic waves toward the front side, and receives infrared rays incident from the front side. The design portion 25 of the base 2 is disposed on the front side of the vehicle electromagnetic wave device 8. Therefore, the design portion 25 is on the electromagnetic wave path of the vehicle electromagnetic wave device 8. In addition, the design portion 25 is capable of transmitting infrared rays as electromagnetic waves.

[0051] 2, the heat conductive part 5 is integrated with the base 2. Specifically, the heat conductive part 5 is made of two heat pipes in which a working fluid is held in a copper pipe, and is fixed to the hollow interior of the base 2. In the electromagnetic wave transparent cover 1 of Example 1, the two heat pipes form separate heat conductive paths. That is, the electromagnetic wave transparent cover 1 of Example 1 has two heat conductive paths. Hereinafter, one of the heat pipes will be referred to as a first heat conduction path 50 and the other heat pipe will be referred to as a second heat conduction path 60.

[0052] The first heat-receiving end 51, which is one end of the first heat-conducting path 50, is introduced inside the electromagnetic wave device 8 for a vehicle and is disposed near the lower side of the elements in the electromagnetic wave device 8 for a vehicle, specifically, the diode (not shown) and the ECU. These elements serve as the heat source 85 in the electromagnetic wave transparent cover 1 of Example 1. The first heat-conducting path 50 extends inside and at the lower part of the base 2 from the back side to the front side, and the first heat-conducting end 52, which is the other end of the first heat-conducting path 50, contacts the back side of the design portion 25 from the underside.

[0053] A second heat receiving end 61, which is one end of the second heat conducting path 60, is introduced inside the electromagnetic wave device 8 for a vehicle and is disposed in the vicinity of the upper side of the diode and ECU, which are the heat source 85. The second heat conducting path 60 extends inside and in the upper part of the base 2 from the back side to the front side, and a second conducting end 62, which is the other end of the second heat conducting path 60, contacts the back side of the design portion 25 from above.

[0054] As shown in Fig. 3, a thin rod-shaped member extending in the left-right direction, i.e., in the longitudinal direction of the design portion 25, is attached to each of the upper and lower ends of the rear surface of the design portion 25. The rod-shaped member attached to the lower end of the rear surface of the design portion 25 is referred to as the first boundary member 28. The rod-shaped member attached to the upper end of the rear surface of the design portion 25 is referred to as the second boundary member 29. The first boundary member 28 and the second boundary member 29 have higher thermal conductivity than the base 2. The first boundary member 28 is in contact with the first conductive end 52, and the second boundary member 29 is in contact with the second conductive end 62.

[0055] The first boundary member 28 is integrated with the design portion 25 of the first divided body 21, and the first heat conductive path 50 including the first conductive end portion 52 is integrated with the second divided body 22. Similarly, the second boundary member 29 is integrated with the design portion 25 of the first divided body 21, and the second heat conductive path 60 including the second conductive end portion 62 is integrated with the second divided body 22. When the first divided body 21 and the second divided body 22 are assembled, the first boundary member 28 comes into contact with the first conductive end portion 52 of the first heat conductive path 50, and the second boundary member 29 comes into contact with the second conductive end portion 62 of the second heat conductive path 60.

[0056] As shown in Fig. 4, the second heat conduction path 60 branches into three. Therefore, the second heat conduction path 60 has three second conductive ends 62. Each second conductive end 62 is connected to the design portion 25 at a different position in the left-right direction. The distance between adjacent second conductive ends 62 is about 3 cm. The distance between the first conductive end 52 and the second conductive end 62 is about 10 cm.

[0057] The heat conducted from the heat source 85 to the second heat conduction path 60 is divided into three directions and conducted to each of the second conduction ends 62, and then transmitted to the second boundary member 29, where it is diffused by the second boundary member 29 in the left-right direction, i.e., along the longitudinal direction of the design portion, and conducted to the design portion 25.

[0058] In the electromagnetic wave transparent cover 1 of Example 1, the heat conductive portion 5 conducts heat from the heat source 85 to the design portion 25 through two paths, the first heat conductive path 50 and the second heat conductive path 60. This allows the radio wave transparent cover of Example 1 to efficiently heat the design portion 25.

[0059] Example 2 The electromagnetic wave transparent cover of Example 2 is generally the same as Example 1, except for the shape of the design portion, the positional relationship between the base and the electromagnetic wave device for a vehicle, and the shape of the second heat conduction path. 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. 5 is an explanatory diagram that typically shows the electromagnetic wave transparent cover of Example 2. Fig. 6 is an explanatory diagram that typically shows the electromagnetic wave transparent cover of Example 2 as viewed from the front side. Fig. 7 is an explanatory diagram that typically shows the electromagnetic wave transparent cover of Example 2 as viewed from above.

[0060] As shown in FIG. 5, the designed portion 25 of the electromagnetic wave transmission cover 1 of the second embodiment is only a part of the portion located on the front side of the first split body 21 of the base body 2, and is surrounded by the general portion . The electromagnetic wave device 8 for a vehicle is disposed on the rear side of the design portion 25 and faces the design portion 25 .

[0061] As shown in FIG. 6, the left-right length of the first boundary member 28 and the second boundary member 29 is longer than the left-right length of the design portion 25 and shorter than the left-right length of the first split body 21 and the second split body 22.

[0062] 7, the second heat conduction path 60 does not branch and extends linearly from the back side to the front side. Therefore, in the electromagnetic wave transparent cover 1 of the second embodiment, the second heat conduction path 60 has only one second conductive end portion 62.

[0063] In the electromagnetic wave transparent cover 1 of the second embodiment, the heat conductive portion 5 also conducts heat from the heat source 85 to the design portion 25 through two paths, the first heat conductive path 50 (not shown) and the second heat conductive path 60. This allows the radio wave transparent cover of the second embodiment to also efficiently heat the design portion 25.

[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: Base 25: Design Department 5: Heat conducting part 52: First conductive end (conductive end) 62: Second conductive end (conductive end) 8: Electromagnetic wave device for vehicles 85:Heat source

Claims

1. An electromagnetic wave transparent cover arranged on a front side of a vehicle electromagnetic wave device, a base having a design portion exposed to the outside of a vehicle cabin on an electromagnetic wave path of the vehicle electromagnetic wave device; a heat conductive portion having a higher thermal conductivity than the base and thermally connecting the design portion to a heat source disposed on the rear side of the design portion; A first boundary member having a thermal conductivity higher than that of the base and being integrated with one end of the design portion; a second boundary member having a higher thermal conductivity than the base and being integrated with the other end of the design portion opposite the one end, The first boundary member and the second boundary member each have a long and thin rod shape and are integrated with the design portion along their longitudinal direction, The heat conductive portion has a plurality of conductive ends which are ends on the design portion side, An electromagnetic wave transparent cover, wherein each of the multiple conductive ends contacts the first boundary member or the second boundary member, such that each of the conductive ends is connected to the design portion at a different position.

2. The electromagnetic wave transparent cover according to claim 1 , wherein the heat source is an element included in the vehicle electromagnetic wave device.

3. The electromagnetic wave transparent cover according to claim 1 , wherein adjacent conductive ends are spaced apart from each other by 5 mm or more.

4. The electromagnetic wave transparent cover according to claim 2 , wherein adjacent conductive ends are spaced apart from each other by 5 mm or more.

5. An electromagnetic wave transparent cover arranged on a front side of a vehicle electromagnetic wave device, a base having a design portion exposed to the outside of a vehicle cabin on an electromagnetic wave path of the vehicle electromagnetic wave device; a heat conductive portion having a higher thermal conductivity than the base and thermally connecting the design portion to a heat source disposed on the rear side of the design portion; The heat conductive portion has a plurality of conductive ends which are ends on the design portion side, each of the conductive ends is connected to the design portion at a different location; The electromagnetic wave transparent cover, wherein adjacent conductive ends are spaced apart from each other by 5 mm or more.

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