JP7600931B2 - Electromagnetic wave transparent cover - Google Patents

Description

The present invention relates to an electromagnetic wave transparent cover that is placed on the front side of an electromagnetic wave device for a vehicle.

In recent years, there has been active development of vehicle driving assistance systems, and vehicles are being fitted with various vehicle electromagnetic wave devices used in these driving systems.

LiDAR (Light Detection and Ranging), which is one type of the above-mentioned 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 an object and detects the light that is reflected off the object. Among LiDARs, those that use near-infrared sensing are advantageous for detecting obstacles at relatively close ranges.

As another type of electromagnetic wave device for a vehicle, there is also known an electromagnetic wave radar device such as a millimeter wave radar or a laser radar, which is used for A.C.C. (Adaptive Cruise Control) of the vehicle.
A.C.C. 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, A.C.C. has been attracting attention as one of the core technologies of the Intelligent Transport System (ITS), which aims to ease congestion and reduce accidents. A millimeter wave radar, which is a type of electromagnetic wave radar device, transmits millimeter waves with a frequency of 30 GHz to 300 GHz and a wavelength of 1 to 10 mm, and receives the millimeter waves reflected by an object. The distance between the vehicle ahead and the vehicle itself and the relative speed can be calculated from the difference between the transmitted wave and the received wave.

The emission and detection units of the various vehicle electromagnetic wave devices described above are mounted on the outermost part of the vehicle (i.e., the front, side, rear, etc. of the vehicle). If the emission and detection units are visible from outside the vehicle, it will impair the design of the vehicle, so it is common to provide an electromagnetic wave transparent cover that covers the emission and detection units on the outer side.

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.

Patent Document 1 introduces an invention relating to an in-vehicle radar device, which is a type of vehicle radio wave device. The in-vehicle radar device introduced in Patent Document 1 transfers radiant heat generated by heat sources 3a, 3b via reflectors 4a, 4b to an emblem 1, which is a type of electromagnetic wave transparent cover, to heat the emblem 1. This type of vehicle radio wave device is capable of heating and melting frost on the electromagnetic wave transparent cover, which is thought to suppress the impairment of sensing functions, communication functions, etc. caused by frost.

JP 2021-85840 A

The vehicle radio wave device introduced in the above-mentioned Patent Document 1 reflects infrared rays generated by a heat source using a reflector, and heats the electromagnetic wave transparent cover using the radiant heat caused by the infrared rays. This type of heating mechanism has the problem that it is relatively less thermally efficient than when the heat generated by the heat source is directly supplied to the radio wave transparent cover, and also has the problem that a separate power source such as electricity is required for the heat source. Furthermore, there is a problem that the freedom of the shape of the electromagnetic wave transparent cover is reduced because other members that block infrared rays cannot be placed between the heat source and the reflector, and between the reflector and the electromagnetic wave transparent cover. 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.

The present invention was made in consideration of the above circumstances, and aims to provide a technology that can efficiently heat an electromagnetic wave transparent cover while ensuring freedom of shape.

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.

The electromagnetic wave-transmitting cover of the present invention allows efficient heating of the design portion of the electromagnetic wave-transmitting cover while ensuring freedom of shape.

1 is an explanatory diagram illustrating an electromagnetic wave transmission cover according to a first embodiment of the present invention; 4 is an explanatory diagram illustrating a schematic view of the electromagnetic wave transmission cover of the first embodiment after being cut; FIG. 1 is an explanatory diagram illustrating a schematic view of an electromagnetic wave transmission cover according to a first embodiment as viewed from the front side; 1 is an explanatory diagram illustrating a schematic view of an electromagnetic wave transmission cover according to a first embodiment as viewed from above; FIG. 11 is an explanatory diagram illustrating an electromagnetic wave transmission cover according to a second embodiment. FIG. 6 is an explanatory diagram that illustrates the electromagnetic wave transmission cover of the second embodiment as viewed from the front side. 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.

The following describes the mode for carrying out the present invention. Unless otherwise specified, the numerical range "a to b" described in this specification includes the lower limit a and the upper limit b. Numerical ranges can be formed by arbitrarily combining these upper and lower limit values, as well as the numerical values listed in the examples. Furthermore, a numerical value arbitrarily selected from within these numerical ranges can be used as a new upper or lower limit numerical value.

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.

The electromagnetic wave transmitting cover of the present invention comprises, 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 rear side of the design part of the base. In other words, the design part of the base in the electromagnetic wave transmitting cover of the present invention is indirectly heated by the heat source disposed on the rear side of the design part via the heat conductive part. Therefore, with the electromagnetic wave transmitting 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.

Here, the heat conduction part has multiple heat conduction paths including a conductive base part on the heat source side and a conductive end part on the design part side that connects to the conductive base. Each conductive end part is connected to a different position on the design part. Therefore, with the electromagnetic wave transparent cover of the present invention, heat can be conducted separately to multiple positions on the design part, making it possible to heat the design part efficiently.

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.

Below, the vehicle exterior part of the present invention will be explained in detail with respect to each of its components.

The electromagnetic wave transmission cover of the present invention is placed on the front side of an electromagnetic wave device for a vehicle. The electromagnetic wave device for a vehicle is not particularly limited as long as it has an emission section for emitting electromagnetic waves and/or a detection section for receiving electromagnetic waves. The type of electromagnetic wave is also not particularly limited.

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

The electromagnetic waves may be any waves 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.

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.

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.

In either case, the design part is the part of the base of the electromagnetic wave transparent cover that is exposed to the outside of the vehicle cabin, and therefore is a part that may have frost or snow adhere to it. In addition, the design part is a part that is located on the electromagnetic wave path, and therefore is a part that may have its electromagnetic wave transmission performance impaired by frost or snow.

There are no particular restrictions on the material of the base, but for the design portion of the base, a material that can transmit electromagnetic waves should be selected.

Considering that the electromagnetic wave transmission cover of the present invention will be mounted on a vehicle, it is preferable to select a resin such as polycarbonate (PC), acrylic resin, or polypropylene (PP) as the material of the base. A design layer capable of displaying various designs may be formed on the base including the design portion by painting, printing, metal deposition, etc.

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

The material of the heat conductive part may be selected appropriately taking into consideration the thermal conductivity relationship with the base. Suitable materials for the heat conductive part 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 into a resin as a filler.

The heat conducting part may be hollow and may be a 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 body.

The heat 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.

The thermally conductive portion 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 portion may be in the form of a layer that is applied, printed, or bonded onto the base, for example.

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 the part on the heat source side, and a conductive end part, which is the 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.

In other words, the heat conductive portion of the electromagnetic wave transparent cover of the present invention conducts heat generated by the heat source to the design portion via multiple paths. At this time, the end of the heat conductive portion on the design portion side, i.e., the conductive end, is connected to the design portion at different positions, so that the design portion is heated from multiple positions. As a result, the electromagnetic wave transparent cover of the present invention makes it possible to efficiently heat the entire design portion.

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.

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.

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

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.

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 simply be disposed on the back side of a plate-shaped base.

The electromagnetic wave transparent 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 transparent cover with less energy.

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.

When the heat source is an element of an electromagnetic wave device for a vehicle, it is preferable that the electromagnetic wave device for a vehicle is disposed inside a box-shaped base. It is also preferable that the heat source of the electromagnetic wave device for a vehicle is in contact with or in close proximity to a heat conductive portion integrated into the base. In this way, it is possible to efficiently recover the heat generated by the heat source by the heat conductive portion while suppressing energy loss.

The heat source used in the electromagnetic wave transmission cover of the present invention is not limited to the elements of the electromagnetic wave device for vehicles described above. For example, it is also preferable to use as a heat source those that generate exhaust heat, such as an engine or motor mounted on a vehicle. It is also preferable to use such heat sources other than the elements of the electromagnetic wave device for vehicles in combination with a heat source that is an element of the electromagnetic wave device for vehicles.

The electromagnetic wave transparent cover of the present invention will be explained below using specific examples.

Example 1
The electromagnetic wave transparent cover of Example 1 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.

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

The base 2 is made of resin and is box-shaped. The base 2 is molded in two halves, a first division 21 which is the front part and a second division 22 which is the back part, and assembled.

In the electromagnetic wave transmission cover 1 of Example 1, 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.

The first and second divisional bodies 21 and 22 that make up the base body 2 are made of PC, and the part that makes up the design part 25 has a hard coat applied to the upper layer.

A LiDAR serving as a vehicle electromagnetic wave device 8 is housed inside the base body 2. 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.
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.

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 .

The first heat receiving end 51, which is one end of the first heat conducting path 50, is introduced into the interior of the vehicle electromagnetic wave device 8 and is disposed near the lower side of the elements in the vehicle electromagnetic wave device 8, specifically the diode (not shown) and the ECU. These elements are 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 other end of the first heat conducting path 50, which is the first conducting end 52, contacts the back side of the design portion 25 from the underside.

The second heat-receiving end 61, which is one end of the second heat-conducting path 60, is introduced inside the vehicle electromagnetic wave device 8 and is disposed near 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 the other end of the second heat-conducting path 60, which is the second conducting end 62, contacts the back side of the design portion 25 from above.

As shown in FIG. 3, a thin rod-shaped member extending in the left-right direction, i.e., the longitudinal direction of the design portion 25, is attached to 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 a 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.

The first boundary member 28 is integrated with the design portion 25 of the first divided body 21, and the first heat conduction path 50 including the first conductive end 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 conduction path 60 including the second conductive end 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 52 of the first heat conduction path 50, and the second boundary member 29 comes into contact with the second conductive end 62 of the second heat conduction path 60.

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

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 is 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.

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.

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 vehicle electromagnetic wave device, 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 shows a schematic view of the electromagnetic wave transparent cover of the second embodiment. Fig. 6 is an explanatory diagram that shows a schematic view of the electromagnetic wave transparent cover of the second embodiment as viewed from the front side. Fig. 7 is an explanatory diagram that shows a schematic view of the electromagnetic wave transparent cover of the second embodiment as viewed from the top side.

As shown in FIG. 5 , the design portion 25 in 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 2 , and is surrounded by the general portion 26 .
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 .

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 division body 21 and the second division body 22.

As shown in FIG. 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 Example 2, the second heat conduction path 60 has only one second conductive end 62.

In the electromagnetic wave transparent cover 1 of Example 2, 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 Example 2 to also efficiently heat the design portion 25.

The present invention is not limited to the embodiments described above and shown in the drawings, and can be modified as appropriate without departing from the spirit of the invention. Furthermore, each of the components shown in this specification, including the embodiments, can be arbitrarily extracted and combined for implementation.

1: electromagnetic wave transmission cover 2: base 25: design part 5: heat conductive part 52: first conductive end (conductive end)
62: Second conductive end (conductive end)
8: Vehicle electromagnetic wave device 85: Heat source

Claims (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;
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. The electromagnetic wave transparent cover according to claim 1, wherein the heat source is an element included in the vehicle electromagnetic wave device. The electromagnetic wave transparent cover according to claim 1 , wherein adjacent conductive ends are spaced apart from each other by 5 mm or more. The electromagnetic wave transparent cover according to claim 2 , wherein adjacent conductive ends are spaced apart from each other by 5 mm or more. 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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