JP7034123B2 - Radar cover - Google Patents

Description

The present invention relates to a radar cover.

In recent years, radar units that detect obstacles and the like around the vehicle using radio waves such as millimeter waves have been mounted on the vehicle. Such a radar unit is arranged inside a radiator grill or an emblem provided on the front surface of the vehicle, and transmits / receives radio waves transmitted through the radiator grill or the like. Therefore, in a vehicle equipped with the radar unit as described above, it is necessary to form the radiator grill and the emblem so that the radio wave can be transmitted while suppressing the attenuation of the radio wave.

On the other hand, since the radiator grille and the emblem are arranged on the front surface of the vehicle, they are extremely important parts in the design of the vehicle, and are often given brilliance in order to improve the sense of quality and texture. In the past, in order to impart such brilliance, it was common to perform a plating process, but the plating layer does not transmit radio waves. For this reason, in recent years, a technique for forming a brilliant film capable of transmitting radio waves has been used in order to impart brilliance and allow radio waves to pass through (see Patent Document 1).

Japanese Unexamined Patent Publication No. 2011-46183

By the way, the brilliant film having radio wave transparency as described above may have minute gaps or the like that allow radio waves to pass through, but the surface is a smooth surface for a person who is visually recognized from the outside of the vehicle. Be recognized. When forming a satin-like design with respect to the bright region of the radar cover on which such a bright film is arranged, it is conceivable to provide an uneven shape on the surface of the bright film. However, since the brilliant film is a very thin film, it is not easy to provide an uneven shape.

Further, as in Patent Document 1, when a glossy inner core is provided as a separate body between the transparent member and the support member, the inner core is strongly pressed against the transparent member to cause a crimping mark in the bright region. May occur.

The present invention has been made in view of the above-mentioned problems. In a radar cover in which a glossy inner core is provided as a separate body between a transparent member and a support member, a satin-like texture can be easily obtained with respect to a bright region. It is possible to apply it, and the purpose is to suppress the generation of crimping marks in the bright region.

The present invention adopts the following configuration as a means for solving the above problems.

The first invention is a radar cover including a transparent member, a support member arranged on the back surface side of the transparent member, and an inner core arranged between the transparent member and the support member and having a gloss. The inner core has a brilliant region that can be visually recognized from the surface side of the transparent member, and at least the region of the back surface region of the transparent member that overlaps with the brilliant region receives external light incident from the surface side of the transparent member. Adopt a configuration that is considered to be a scattered rough surface.

In the second aspect of the invention, in the first aspect of the invention, the region of the back surface region of the transparent member to which the support member is fixed is a rough surface having a larger surface roughness than the region overlapping the bright region. The configuration is adopted.

The third invention adopts the configuration in which the region to which the support member is fixed is arranged so as to surround the brilliant region when viewed from the surface side of the transparent member in the second invention. do.

In the fourth invention, in any one of the first to third inventions, the configuration in which the support member is black is adopted.

In the fifth aspect of the invention, in any one of the first to fourth inventions, a recess for arranging the inner core is provided on the back surface of the transparent member, and the inner wall surface of the recess is a region overlapping the bright region. Adopt the configuration that is.

In the sixth aspect of the invention, in any one of the first to fifth inventions, the print layer fixedly formed on the back surface of the transparent member is provided, and the region of the back surface region of the transparent member on which the print layer is formed is , A configuration is adopted in which the surface roughness is larger than that of the region overlapping the bright region.

Conventionally, in a radar cover having an inner core, the back surface of the transparent member has been made a smooth surface so as not to obstruct the incident of external light on the glossy inner core. On the other hand, according to the present invention, at least the region of the back surface region of the transparent member that overlaps with the bright region is a rough surface that scatters external light. Therefore, according to the present invention, external light is scattered in the bright region, and a satin-like texture can be imparted to the bright region. At the same time, according to the present invention, since the region overlapping the bright region of the back surface region of the transparent member is a rough surface, the inner core and the transparent member are compared with the case where the region is a smooth surface with less unevenness. The contact area can be reduced. Therefore, it is possible to suppress the occurrence of crimping marks in the bright region. Therefore, according to the present invention, in a radar cover in which a glossy inner core is provided as a separate body between a transparent member and a support member, it is possible to easily give a satin-like texture to a bright region. It is possible to suppress the generation of crimping marks in the bright region.

(A) is a front view of the radiator grill 1 provided with the radar cover according to the first embodiment of the present invention, and (b) is an enlarged front view of the radar cover according to the first embodiment of the present invention. It is a schematic cross-sectional view of the radar cover in 1st Embodiment of this invention. It is a schematic diagram for demonstrating the manufacturing method of the radar cover in 1st Embodiment of this invention. It is an enlarged front view of the radar cover in the 2nd Embodiment of this invention. It is a schematic sectional view of the radar cover in 2nd Embodiment of this invention.

Hereinafter, an embodiment of the radar cover according to the present invention will be described with reference to the drawings.

(First Embodiment)
FIG. 1A is a front view of the radiator grill 1 provided with the radar cover 10 of the first embodiment, and FIG. 1B is an enlarged front view of the radar cover 10 of the first embodiment. Further, FIG. 2 is a schematic cross-sectional view of the radar cover 10 of the first embodiment.

The radiator grill 1 is provided on the front surface of the vehicle so as to close the opening leading to the engine room of the vehicle, ensuring ventilation to the engine room and preventing foreign matter from entering the engine room. In the center of the radiator grill 1, a radar cover 10 is provided so as to face the radar unit R arranged in the engine room. In the radiator grill 1, the portion other than the radar cover 10 does not need to have radio wave transmission, and is therefore plated with, for example, chromium (Cr).

The radar unit R (see FIG. 2) has, for example, a transmitting unit that transmits millimeter waves, a receiving unit that receives reflected waves, an arithmetic unit that performs arithmetic processing, and the like. The radar unit R transmits and receives radio waves transmitted through the radar cover 10, and detects the surrounding conditions of the vehicle based on the received radio waves. For example, the radar unit R calculates and outputs the distance to the obstacle, the relative speed of the obstacle, and the like.

The radar cover 10 is arranged so as to cover the radar unit R when viewed from the front side of the vehicle. As shown in FIG. 1B, the radar cover 10 improves the visibility of the bright region 10A representing figures, characters, etc. showing the emblem of the vehicle manufacturer and the bright region 10A when viewed from the front side of the vehicle. It is a component having a black region 10B to be caused. In the present embodiment, the bright region 10A is provided with a satin-like texture. As shown in FIG. 2, such a radar cover 10 includes a transparent member 11, an inner core 12, and a base member 13 (support member).

The transparent member 11 is a portion formed of a substantially rectangular transparent material arranged on the outermost side of the vehicle. In order to improve the visibility of the inner core 12 from the outside of the vehicle, the transparent member 11 has a smooth surface on the front side. Further, a recess 11a in which the inner core 12 is arranged is formed on the back surface (back surface) of the transparent member 11. Further, the region where the recess 11a on the back surface of the transparent member 11 is not provided is a surface to be fixed to the base member 13.

The recess 11a is a portion for accommodating the inner core 12, and makes the accommodated inner core 12 three-dimensionally visible from the front side of the vehicle. The recess 11a is provided along the shape of a figure such as an emblem of a vehicle manufacturer or a character. By accommodating the inner core 12 in such a recess 11a, the above-mentioned bright region 10A is formed. That is, the bright region 10A is a region where the inner core 12 can be visually recognized from the surface side of the transparent member 11.

As described above, in the present embodiment, in the back surface region of the transparent member 11, the inner wall surface of the recess 11a is a region that overlaps with the bright region 10A when viewed from the front side of the transparent member 11. In the following description, of the back surface region of the transparent member 11, the region where the inner wall surface of the recess 11a overlaps the bright region 10A when viewed from the front side of the transparent member 11 is referred to as an inner core arrangement region R1. Further, in the back surface region of the transparent member 11, the region where the recess 11a is not provided is a region fixed to the base member 13 as described above. In the following description, the region fixed to the base member 13 on the back surface of the transparent member 11 is referred to as a base member fixing region R2.

The inner wall surface of the recess 11a, which is the inner core arrangement region R1, is a rough surface having a surface roughness that scatters external light incident from the outside of the transparent member 11. That is, in the present embodiment, of the back surface region of the transparent member 11, the region overlapping the bright region 10A when viewed from the front side of the transparent member 11 is a rough surface that scatters external light. The transparent member 11 is formed, for example, by injection molding using a mold. Therefore, by surface-treating the surface of the mold by blasting or the like, it is possible to form the transparent member 11 provided with the recess 11a having the inner wall surface made of a rough surface.

As will be described later, the inner core 12 is housed in the recess 11a, and the surface on the transparent member 11 side is in contact with the inner wall surface of the recess 11a. That is, in the present embodiment, of the back surface region of the transparent member 11, the region with which the inner core 12 is in contact is the inner core arrangement region R1 made of a rough surface. Therefore, the contact area between the transparent member 11 and the inner core 12 is reduced as compared with the case where the inner wall surface of the recess 11a is a smooth surface.

Further, the base member fixing region R2 is a rough surface having a larger surface roughness (for example, arithmetic average roughness and maximum height) than the inner core arrangement region R1. Since the base member fixing region R2 is a region to which the base member 13 forming the black region 10B described later is fixed, it is a region where external light is absorbed by the base member 13. Therefore, unlike the inner core 12, the base member fixing region R2 does not need to scatter external light, but has a rough surface with a large surface roughness. As described above, when the surface roughness of the base member fixing region R2 is large, the contact area between the transparent member 11 and the base member 13 increases as compared with the case where the surface roughness of the base member fixing region R2 is small, and the transparent member 11 and the base member 13 are firmly fixed to each other.

As described above, since the external light is absorbed by the base member 13 in the base member fixing region R2, the uneven shape in the base member fixing region R2 is not conspicuous even if the surface roughness is increased. Therefore, even if the surface roughness of the base member fixing region R2 is made larger than that of the inner core arrangement region R1, the appearance impression of the radar cover 10 is not significantly affected.

As can be seen from the fact that the black region 10B surrounds the bright region 10A over the entire circumference in FIG. 1 (b), the base member fixing region R2 is the bright region 10A (that is, the bright region 10A) when viewed from the surface side of the transparent member 11. The inner core 12) is arranged so as to surround the entire circumference. In the base member fixing region R2, the transparent member 11 and the base member 13 are firmly fixed and have a high sealing property. Therefore, by continuously surrounding the bright region 10A over the entire circumference by such a base member fixing region R2, outside air and moisture reach the inner core 12 from the boundary portion between the transparent member 11 and the base member 13. Can be deterred.

Such a transparent member 11 is formed of, for example, a transparent synthetic resin such as transparent PC (polycarbonate) or PMMA (polymethylmethacrylate resin), and has a thickness of about 1.5 mm to 10 mm. Further, the front surface of the transparent member 11 is subjected to a hard coat treatment for preventing scratches or a clear coat treatment of urethane-based paint, if necessary. If it is a transparent synthetic resin having scratch resistance, these scratch prevention treatments are unnecessary.

The inner core 12 is formed by laminating a base portion, a base coat layer, a glittering film, and a top coat layer. In addition, in order to improve visibility in the drawings, the inner core 12 is not shown by being divided into a plurality of layers. The base is molded by injection molding or the like, and is formed of, for example, a synthetic resin such as ABS, PC or PET. This base portion has a convex shape in which the recess 11a of the transparent member is embedded, and is fitted into the recess 11a of the transparent member 11. The base coat layer is formed between the base and the brilliant film, and is for improving the adhesion between the base and the brilliant film. This base coat layer is formed, for example, by clear coating using a transparent (including colored transparent) synthetic resin.

The brilliant film is formed on the front surface (the surface on the transparent member 11 side) of the base portion, and is a layer having metal brilliance arranged so as to cover the base portion. This bright film is, for example, a thin metal film made of indium (In). This brilliant film has a structure having a plurality of islands arranged with gaps between them, and is a discontinuous film having a large number of fine gaps. Such a brilliant film is made capable of transmitting radio waves through these gaps. Due to such a brilliant film, the inner core 12 is made metallic. Further, the brilliant film may be a thin film formed of an alloy containing a semiconductor and a metal. Specifically, a glitter film can be formed by an alloy of a semiconductor such as silicon (Si) or germanium (Ge) and a metal such as aluminum (Al) or chromium (Cr). The bright film formed of such an alloy contains a semiconductor having less free electrons than a metal, and has a property of transmitting electromagnetic waves.

The top coat layer is formed on the brilliant film so as to cover the brilliant film, and is for protecting the brilliant film. Like the base coat layer, this top coat layer is also formed by clear coating using a transparent (including colored transparent) synthetic resin, for example.

The base coat layer and the top coat layer may be a transparent ceramic coat layer made of silicon oxide (SiOx). In this case, it has higher heat resistance and higher radio wave transparency as compared with a base coat layer or a top coat layer made of a resin formed by clear coating or the like.

Further, in the present embodiment, the glitter film is formed on the surface of the base on which the base coat layer is formed. When a bright film having high adhesion is used, the base coat layer can be omitted.

Such an inner core 12 has a metallic luster due to having a glittering film, and is arranged between the transparent member 11 and the base member 13. Further, the inner core 12 is housed in a recess 11a provided on the back surface of the transparent member 11, and is in contact with the inner core arrangement region R1 which is an inner wall surface of the recess 11a which is a rough surface.

The base member 13 is arranged on the back surface side of the transparent member 11 and is formed of a black resin material. The base member 13 has an engaging portion 13a protruding toward the engine room side. The tip of the engaging portion 13a is formed in a claw shape, and the tip is locked to, for example, a radiator grill main body. The base member 13 thus fixed to the base member fixing region R2 on the back surface of the transparent member 11 is visible from the outside of the transparent member 11 and forms the black region 10B described above. The base member 13 makes a region other than the bright region 10A visible in black, and relatively improves the visibility of the bright region 10A.

Such a base member 13 includes ABS (acrylonitrile / butadiene / styrene copolymer synthetic resin), AES (acrylonitrile / ethylene / styrene copolymer synthetic resin), ASA (acrylonitrile / styrene / acrylate), PBT (polybutylene terephthalate), and the like. It is made of colored PC, synthetic resin such as PET (polyethylene terephthalate), or a composite resin thereof, and has a thickness of about 0.5 mm to 10 mm.

Subsequently, a method of manufacturing the radar cover 10 of the present embodiment will be described with reference to FIG. FIG. 3 is a schematic diagram for explaining a method of manufacturing the radar cover 10 of the present embodiment.

First, as shown in FIG. 3A, the transparent member 11 is formed. For example, the transparent member 11 is formed by injection molding a resin material. Since the transparent member 11 having the recess 11a can be formed by this injection molding, it is not necessary to form the recess 11a in a subsequent step. Here, in the present embodiment, for example, unevenness is formed in advance on the mold used for injection molding so that the inner core arrangement region R1 and the base member fixing region R2 are rough surfaces. Thereby, the transparent member 11 having the inner core arrangement region R1 and the base member fixing region R2 as rough surfaces can be formed by one-time injection molding. If necessary, the surface side (the surface facing the outside of the vehicle) or the entire surface of the transparent member 11 may be subjected to a hard coat treatment for improving durability and the like.

Next, as shown in FIG. 3 (b), the inner core 12 is formed. For example, the base is formed by injection molding. In addition, a base coat layer is formed by clear coating the base and then drying. In addition, a glitter film is formed on the base coat layer by sputtering or vacuum deposition. Further, a top coat layer is formed by applying a clear coating on the surface of the brilliant film and then drying it. It is not necessary to wait for the formation of the transparent member 11 shown in FIG. 3A before forming the inner core 12. By forming the inner core 12 in parallel with the process of forming the transparent member 11 shown in FIG. 3A, the manufacturing time of the radar cover 10 can be shortened.

Subsequently, as shown in FIG. 3C, the inner core 12 is fitted into the recess 11a of the transparent member 11. Next, as shown in FIG. 3D, the base member 13 is formed. Here, the transparent member 11 in which the inner core 12 is installed in the recess 11a is placed inside the mold for injection molding, and insert molding is performed by injecting the molten resin onto the back surface side of the transparent member 11. The member 13 is formed. Such a base member 13 is welded to the transparent member 11 by the heat at the time of insert molding, and is arranged so as to cover the inner core 12. The back surface of the inner core 12 is also welded to the base member 13. As a result, the inner core 12 is supported by the base member 13.

The radar cover 10 of the present embodiment as described above is arranged between the transparent member 11, the base member 13 arranged on the back surface side of the transparent member 11, and the transparent member 11 and the base member 13, and has a metallic luster. It is provided with an inner core 12 having the above. The inner core 12 has a bright region 10A that can be visually recognized from the front surface side of the transparent member 11, and the region (inner core arrangement region R1) that overlaps with at least the bright region 10A in the back surface region of the transparent member 11 is from the front surface side of the transparent member 11. It is said to be a rough surface that scatters incident external light.

Conventionally, in the radar cover 10 having the inner core 12, the back surface of the transparent member 11 has been made a smooth surface so as not to interfere with the incident of external light on the inner core 12 having a metallic luster. On the other hand, according to the radar cover 10 of the present embodiment, at least the region of the back surface region of the transparent member 11 that overlaps with the bright region 10A is a rough surface that scatters external light. Therefore, according to the radar cover 10 of the present embodiment, external light is scattered in the bright region 10A, and a satin-like texture can be imparted to the bright region 10A. At the same time, according to the radar cover 10 of the present embodiment, the region overlapping the bright region 10A of the back region of the transparent member 11 is a rough surface, so that the region is a smooth surface with less unevenness, as compared with the case where the region is a smooth surface. The contact area between the inner core 12 and the transparent member 11 can be reduced. Therefore, it is possible to suppress the occurrence of crimping marks in the bright region 10A. Therefore, according to the radar cover 10 of the present embodiment, in the radar cover 10 in which the inner core 12 having a metallic luster is provided as a separate body between the transparent member 11 and the base member 13, the bright region 10A can be easily referred to. It is possible to impart a satin-like texture and suppress the occurrence of crimping marks in the bright region 10A.

Further, in the radar cover 10 of the present embodiment, the region of the back surface region of the transparent member 11 to which the base member 13 is fixed (base member fixing region R2) has a larger surface roughness than the region overlapping with the bright region 10A. It is said to be a rough surface. In such a radar cover 10 of the present embodiment, since the surface roughness of the base member fixing region R2 is larger than that of the inner core arrangement region R1, the fixing force between the transparent member 11 and the base member 13 is strengthened. Further, since the external light is absorbed by the base member 13 in the base member fixing region R2, the uneven shape in the base member fixing region R2 is not conspicuous even if the surface roughness is increased. Therefore, even if the surface roughness of the base member fixing region R2 is made larger than that of the inner core arrangement region R1, the appearance impression of the radar cover 10 is not significantly affected. Therefore, according to the radar cover 10 of the present embodiment, it is possible to improve the adhesive force between the transparent member 11 and the base member 13 without significantly affecting the appearance impression of the radar cover 10.

Further, in the radar cover 10 of the present embodiment, the region to which the base member 13 is fixed is arranged so as to surround the bright region 10A when viewed from the surface side of the transparent member 11 around the entire circumference. In the base member fixing region R2, which is a region to which the base member 13 is fixed, the transparent member 11 and the base member 13 are firmly fixed to each other, and the sealing property is high. Therefore, by continuously surrounding the bright region 10A over the entire circumference by the base member fixing region R2, it is possible to prevent outside air and moisture from reaching the inner core 12 from the boundary portion between the transparent member 11 and the base member 13. This can prevent the appearance of the inner core 12 from deteriorating.

Further, in the radar cover 10 of the present embodiment, the base member 13 is black. Therefore, most of the external light incident on the base member 13 is absorbed by the base member 13, and it becomes possible to make it more difficult to visually recognize the uneven shape in the base member fixing region R2.

Further, in the radar cover 10 of the present embodiment, a recess 11a for arranging the inner core 12 is provided on the back surface of the transparent member 11, and the inner wall surface of the recess 11a is a region overlapping the bright region 10A. According to the radar cover 10 of the present embodiment as described above, since the inner core 12 can be arranged in the recessed portion 11a, the inner core 12 can be reliably positioned with respect to the transparent member 11. Therefore, when the base member 13 is formed by insert molding or the like, it is possible to prevent the inner core 12 from unintentionally moving with respect to the transparent member 11.

(Second Embodiment)
Next, the second embodiment of the present invention will be described with reference to FIGS. 4 and 5. In the description of the second embodiment, the same parts as those of the first embodiment will be omitted or simplified.

FIG. 4 is an enlarged front view of the radar cover 20 of the second embodiment. Further, FIG. 5 is a schematic cross-sectional view of the radar cover 20 of the second embodiment. As shown in FIG. 4, in the radar cover 20 of the present embodiment, the bright region 10A has a rectangular frame shape, and the region surrounded by the bright region 10A is the print region 10C. The print area 10C is an area in which the print layer 14 arranged between the transparent member 11 and the base member 13 can be visually recognized from the outside of the transparent member 11.

As shown in FIG. 5, of the back surface region of the transparent member 11, the region surrounded by the recess 11a (the region surrounded by the inner core arrangement region R1) is the print layer forming region R3, and the print layer 14 is formed. It is fixed and formed. The print layer 14 is, for example, black, and can be visually recognized from the outside via the transparent member 11. Such a printing layer 14 is formed by applying ink by a printing method such as silk printing, pad printing, inkjet printing, or the like, and then drying the ink.

In the radar cover 20 of the present embodiment, the print layer forming region R3 is a rough surface having a larger surface roughness (for example, arithmetic average roughness and maximum height) than the inner core arrangement region R1. The print layer forming region R3 is a region in which external light is absorbed by the print layer 14, similarly to the base member fixing region R2. Therefore, unlike the inner core 12, the print layer forming region R3 has a lower need to scatter external light than the inner core arrangement region R1, and has a rough surface with a large surface roughness. As described above, when the surface roughness of the print layer forming region R3 is large, the contact area between the transparent member 11 and the print layer 14 increases as compared with the case where the surface roughness of the print layer forming region R3 is small, and the transparent member 11 and the print layer 14 are firmly fixed to each other.

Since the external light is absorbed by the print layer 14 in the print layer forming region R3, the uneven shape in the print layer forming region R3 is not conspicuous even if the surface roughness is increased. Therefore, even if the surface roughness of the print layer forming region R3 is made larger than that of the inner core arrangement region R1, the appearance impression of the radar cover 20 is not significantly affected.

Although the preferred embodiment of the present invention has been described above with reference to the accompanying drawings, it goes without saying that the present invention is not limited to the above embodiment. The various shapes and combinations of the constituent members shown in the above-described embodiment are examples, and can be variously changed based on design requirements and the like without departing from the spirit of the present invention.

For example, in the above embodiment, the configuration in which the back surface region of the transparent member 11 is a rough surface capable of scattering external light even in a region different from the inner core arrangement region R1 has been described. However, the present invention is not limited to this. For example, it is also possible to adopt a configuration in which only the inner core arrangement region R1 is a rough surface and a region different from the inner core arrangement region R1 is a smooth surface.

Further, in the above embodiment, the configuration in which the base member 13 and the print layer 14 are black has been described. However, the present invention is not limited to this. For example, the base member 13 and the print layer 14 may have a color other than black, such as blue.

Further, in the above embodiment, the brilliant film is a layer having metallic brilliance. However, the brilliant film may be a glossy layer, and is not limited to a metal (indium) or a semiconductor alloy. It is also possible to make a thin film coated with a glossy paint.

1 ... Radiator grill, 10 ... Radar cover, 10A ... Bright area, 10B ... Black area, 10C ... Printing area, 11 ... Transparent member, 11a ... Recess, 12 ... Inner core, 13 ... Base Member (support member), 14 ... Print layer, 20 ... Radar cover, R1 ... Inner core placement area (area overlapping the bright area), R2 ... Base member fixing area (region where the support member is fixed), R3 …… Print layer formation area (area where the print layer is formed)

Claims (5)

A radar cover including a transparent member, a support member arranged on the back surface side of the transparent member, and an inner core arranged between the transparent member and the support member and having a metallic luster.
The inner core has a bright region that can be visually recognized from the surface side of the transparent member.
A metallic glitter film is provided on the surface of the inner core on the transparent member side.
Of the back surface region of the transparent member, at least a region overlapping the bright region is a rough surface that scatters external light incident from the surface side of the transparent member.
Of the back surface region of the transparent member, the region to which the support member is fixed is a rough surface having a larger surface roughness than the region overlapping the bright region.
A radar cover that features that. The radar cover according to claim 1 , wherein the region to which the support member is fixed is arranged so as to surround the bright region around the entire circumference when viewed from the surface side of the transparent member. The radar cover according to claim 1 or 2 , wherein the support member is black. A recess for arranging the inner core is provided on the back surface of the transparent member.
The radar cover according to any one of claims 1 to 3 , wherein the inner wall surface of the recess is a region overlapping the bright region. A printing layer fixedly formed on the back surface of the transparent member is provided.
Any one of claims 1 to 4 , wherein the region of the back surface region of the transparent member on which the print layer is formed is a rough surface having a surface roughness larger than that of the region overlapping the bright region. Radar cover as described in section.

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