JP6331098B2 - Radio wave transmission cover for vehicles - Google Patents

Description

  The present invention relates to a radio wave transmission cover for a vehicle disposed on the front side of a radio wave radar device.

  The radio wave transmission cover for a vehicle is an A.V. C. It is one of the members that constitute C (Adaptive Cruise control). A. C. C. Measures the distance and relative speed between the vehicle ahead and the vehicle using sensors mounted on the front side of the vehicle. Based on this information, the throttle and brake are controlled to accelerate and decelerate the vehicle and control the distance between the vehicles. Technology. A. C. C. In recent years, has attracted attention as one of the core technologies of the Intelligent Transport System (ITS) aimed at reducing traffic congestion and reducing accidents. A. C. C. In general, a radio wave radar device such as a laser radar or a millimeter wave radar is used as a sensor for use. For example, a millimeter wave radar transmits a millimeter wave having a frequency of 30 GHz to 300 GHz and a wavelength of 1 to 10 mm, and receives a millimeter wave reflected on an object. Then, the inter-vehicle distance and relative speed between the preceding vehicle and the host vehicle are calculated from the difference between the transmitted wave and the received wave. Hereinafter, as necessary, the “vehicle radio wave transmission cover” is simply abbreviated as “radio wave transmission cover”.

  The radio wave radar device is generally disposed on the rear side of an exterior member such as a front grill. The exterior member is provided with an opening for attaching the radio wave transmission cover. On the other hand, the radio wave transmission cover is disposed so as to cover the opening, and is attached to the exterior member by a method such as engagement, fitting, and adhesion, and the front surface of the radio wave radar device disposed on the rear side of the exterior member. cover. Generally, the radio wave transmission cover is also used as a design body for displaying a predetermined design such as an emblem.

  The radio wave radar device transmits and receives radio waves through a radio wave transmission cover. When transmitting radio waves, the radio radar device emits radio waves radially at a predetermined angle in the horizontal direction from the radio wave output unit toward the front of the vehicle. For this reason, the shorter the distance between the radio wave output unit and the radio wave transmission cover in the radio wave radar device, the smaller the radio wave transmission area in the radio wave transmission cover, and thus there is an advantage that the radio wave transmission cover can be reduced in size.

  A general radio wave transmission cover is formed in a plate shape having a substantially constant thickness in consideration of radio wave transmission. An attachment portion for attaching the radio wave transmission cover to the exterior member is provided so as to protrude from the rear surface side of the radio wave transmission cover and outside the above radio wave transmission area so as not to impair the radio wave transmission property of the radio wave transmission cover. When the radio wave transmission cover is attached to the exterior member by such an attachment portion, the boundary portion between the outer edge of the radio wave transmission cover and the exterior member is visually recognized as a parting part between the design body and the exterior body. In order to attach the plate-shaped radio wave transmission cover with a sense of unity to an exterior member having a relatively large three-dimensional shape such as a front grill, it is necessary to mold both with high dimensional accuracy. However, since a large exterior member has a large dimensional error, it is difficult to mold it with high dimensional accuracy, and it is very difficult to attach the radio wave transmission cover to this type of exterior member with a sense of unity.

  Further, as described above, the attachment portion for attaching the radio wave transmission cover to the exterior member is generally provided on the rear surface of the radio wave transmission cover, but the radio wave radar device is disposed on the rear surface side of the radio wave transmission cover. The Therefore, the radio wave transmitting cover needs to be separated from the radio wave radar device so that the mounting portion does not interfere with the radio wave radar device. That is, it is difficult to bring the radio wave output unit and the radio wave transmission cover close to each other in the radio wave radar device, and as a result, there is a problem that it is difficult to reduce the radio wave transmission cover. Therefore, further improvement of the radio wave transmission cover is demanded.

JP 2006-347126 A

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a vehicle radio wave transmission cover with improved various characteristics.

The vehicle radio wave transmission cover of the present invention that solves the above problems is a vehicle radio wave transmission cover arranged on the front side of the radio wave radar device,
A first base material made of a transparent resin material, and a second base material made of an opaque resin material and molded integrally with the first base material,
The second base material is
A rear surface covering portion covering the rear surface side of the first base material;
A front cover covering at least a part of the peripheral edge on the front side of the first substrate;
And an attachment portion that continues to the outer edge portion of the front surface covering portion and the rear surface covering portion and extends rearward.

  According to the technology of the present invention, various characteristics of the radio wave transmission cover for a vehicle can be improved.

1 is a perspective view schematically showing a vehicle radio wave transmission cover of Example 1. FIG. It is explanatory drawing which represents typically a mode that the electromagnetic wave transmission cover for vehicles of Example 1 was seen from the front side. It is explanatory drawing which represents typically the cross section of the electromagnetic wave transmission cover for vehicles of Example 1 arrange | positioned at the vehicle. It is explanatory drawing which represents typically the cross section of the conventional radio wave transmission cover for vehicles. It is explanatory drawing which represents typically a mode that the conventional radio wave transmission cover for vehicles was seen from the front side. It is explanatory drawing which represents typically the cross section of the conventional radio wave transmission cover for vehicles. It is explanatory drawing which represents typically a mode that the conventional radio wave transmission cover for vehicles was seen from the front side.

  The radio wave transmission cover of the present invention has a first base material and a second base material made of a resin material.

  The first substrate is made of a transparent resin material. The term “transparent” as used in the present invention means that the design on the rear surface side of the first base material has such light transmittance that a human can visually recognize from the front surface side of the first base material. That is, the first base material is made of a transparent resin material having such light transmittance. The transparent resin material may be composed of only the above-described transparent resin having optical transparency, or may contain an amount of an additive that does not significantly impair the transparency in addition to the transparent resin. Although there is no limitation in particular as an additive, a color pigment, a filler, etc. are illustrated. That is, the transparent resin material may be colorless or colored. The transparent resin for the first base material is not particularly limited as long as it is transparent and resin, but it is preferable to select in consideration of the performance required for the radio wave transmission cover such as radio wave permeability and weather resistance. It is preferable to use a resin having a small dielectric loss tangent. If the dielectric loss tangent is small, it is difficult for radio waves such as millimeter waves to be converted into thermal energy, so that attenuation of radio waves can be suppressed. Specifically, it is preferable to select at least one selected from polymethyl methacrylate resin (PMMA), polycarbonate (PC), and copolymer polycarbonate resin.

On the other hand, the second substrate is made of an opaque resin material. The term “opaque” as used in the present invention means that, contrary to the above-described transparency, the design on the rear surface side of the second base material is low in light transmittance to such an extent that a person cannot visually recognize from the front surface side of the second base material. Similarly, the opaque resin material may be composed of only the opaque resin having the above-described light transmittance, or may contain an additive in addition to the opaque resin. Or you may obtain an opaque resin material by mix | blending an additive suitably with transparent resin and reducing light transmittance. The opaque resin for the second substrate is not particularly limited, but is preferably selected in consideration of radio wave transmission, weather resistance, dielectric loss tangent and the like as described above. Specific examples include acrylonitrile-ethylene-styrene resin (AES), acrylonitrile-butadiene-styrene resin (ABS), and PC. As the transparent resin for the second substrate, the same transparent resin as described above can be used. In addition, you may further cover the front surface of the above-mentioned 1st base material, and the front surface of the front surface coating | coated part mentioned later in a 2nd base material with the coat layer excellent in a weather resistance. As a material for the coat layer, a hard coat paint or film mainly composed of an ultraviolet (UV) curable or electron beam (EB) curable acrylic resin, or a hard coat mainly composed of a thermosetting silicone resin. Examples thereof include paints and films. These may use only 1 type and may use 2 or more types together. Similarly, the rear surface of the rear surface coating portion to be described later on the second base material may be covered with various coat layers as necessary.
Hereinafter, the radio wave transmission cover of the present invention will be described with specific examples.

(Example)
The radio wave transmission cover of the embodiment is disposed on a front grill of a vehicle and displays an emblem-like design. FIG. 1 is a perspective view schematically showing the radio wave transmission cover of the embodiment, and FIG. 2 is an explanatory diagram schematically showing the radio wave transmission cover of the embodiment viewed from the front side. FIG. 3 is a cross-sectional view schematically showing a state in which the radio wave transmission cover of the embodiment is arranged in the vehicle. FIG. 4 is an explanatory diagram schematically showing a cross section of a conventional radio wave transmission cover, and FIG. 5 is an explanatory diagram schematically showing a state of the conventional radio wave transmission cover viewed from the front side. Furthermore, FIG. 6 shows an explanatory view schematically showing a cross section of another conventional radio wave transmission cover, and FIG. 7 shows an explanatory view schematically showing the other radio wave transmission cover as viewed from the front side. Hereinafter, the front and rear refer to the front and rear as shown in FIGS. 1 and 3, and the upper and lower refer to the upper and lower as shown in FIGS.

  As shown in FIGS. 1 and 2, the radio wave transmission cover 1 according to the embodiment includes a design portion 10 and a frame portion 11 that surrounds the design portion 10. The design part 10 displays an emblem-like design, and the frame part 11 surrounds the design part 10.

As shown in a cross section in FIG. 3, the front grill 100 of the vehicle is provided with a window-like opening 101, and a radio wave radar device 102 is disposed behind the opening 101. The radio wave transmission cover 1 according to the embodiment is attached to the opening 101 of the front grill 100 and is disposed on the front side of the radio wave radar device 102.
The radio wave transmission cover 1 according to the embodiment includes a first base material 2, a second base material 3, and a decoration layer 5.

  The first substrate 2 is made of PC, which is a kind of transparent resin. The 1st base material 2 comprises the front surface of the design part 10, and makes a substantially disc shape. The peripheral edge portion of the first base material 2 constitutes an annular flange portion 20 that is thinner and flatter than the central portion of the first base material 2. The central portion of the first base material 2 constitutes a design transmission portion 21 that is raised toward the front side compared to the flange portion 20.

  The second base material 3 is made of AES, which is a kind of non-transparent resin, and includes a rear surface covering portion 31, a front surface covering portion 32, and an attachment portion 38. The rear surface covering portion 31 covers the rear surface of the first base material 2, and the front surface covering portion 32 covers the entire circumference of the peripheral portion of the front surface of the first base material 2, that is, the front surface of the flange portion 20.

  The attachment portion 38 is continuous with the outer edge portion 31a of the rear surface covering portion 31 and the outer edge portion 32a of the front surface covering portion 32 and extends rearward. More specifically, the outer edge portion 31a of the rear surface covering portion 31 and the outer edge portion 32a of the front surface covering portion 32 are integrated over the entire circumference in the circumferential direction, and the attachment portion 38 is formed on the outer edge portion 31a of the rear surface covering portion 31. It continues to both the entire circumference and the entire circumference of the outer edge portion 32a of the front surface covering portion 32. Accordingly, the attachment portion 38 has a substantially cylindrical shape. As shown in FIGS. 1 and 3, the second base material 3 has a substantially box shape with the rear surface covering portion 31 and the front surface covering portion 32 as the top wall and the mounting portion 38 as the side wall. Therefore, the radio wave transmission cover 1 according to the embodiment can accommodate the radio wave radar device 102 therein as shown in FIG.

  As shown in FIG. 3, the design portion 10 includes a first base material 2, a decorative layer 5, and a rear surface covering portion 31. The first base material 2 constitutes the forefront surface of the design portion 10, the decorative layer 5 is adjacent to the rear surface of the first base material 2, and the rear surface covering portion 31 is adjacent to the rear surface of the decorative layer 5. The rear surface of the first substrate 2 has an uneven shape. Specifically, the peripheral edge portion on the rear surface of the first base material 2 constitutes a first design region 2 a that is depressed in an annular shape over the entire circumference of the rear surface of the first base material 2. The central portion of the rear surface of the first base material 2 constitutes a second design region 2b that is relatively raised as compared with the depressed first design region 2a. The first design region 2 a appears to be raised when viewed from the surface side of the first base material 2, that is, from the surface side of the radio wave transmission cover 1. The second design region 2b appears to be depressed when viewed from the surface side of the radio wave transmission cover 1. That is, when viewed from the front surface side of the radio wave transmission cover 1, the decorative layer 5 appears to be raised in the first design region 2a and appears to be depressed in the second design region 2b.

  The decorative layer 5 includes a colored decorative portion 50 and a metallic gloss portion 51, and is interposed between the first base material 2 and the rear surface covering portion 31. The colored decorative portion 50 mainly constitutes a portion of the decorative layer 5 on the first base material 2 side, and the metallic gloss portion 51 mainly constitutes a portion of the decorative layer 5 on the rear surface covering portion 31 side. More specifically, the colored decorative portion 50 is printed on the second design region 2b. The metallic gloss portion 51 is made of indium and is deposited on the rear surface side of the first base material 2 on which the colored decoration portion 50 is formed. Therefore, the metallic luster part 51 is extended over the rear surface of the colored decorative part 50, the first design region 2 a, and the rear surface of the flange part 20.

  The 1st base material 2, the decoration layer 5, and the 2nd base material 3 are integrally shape | molded by the insert molding method. As an example of the insert molding method, first, the first base material 2 is injection-molded, and then the decorative layer 5 is formed on the rear surface side of the first base material 2 by the procedure described above. And the 2nd base material 3 is injection-molded on the back surface side of the 1st base material 2 and the decoration layer 5 by using the 1st base material 2 in which the decoration layer 5 was formed as an insert material. By integrally molding the first base material 2, the decorative layer 5 and the second base material 3, the first base material 2, the decorative layer 5 and the second base material 3 are in close contact with each other without a gap. Thus, since at least the design portion 10 has a multilayer structure in the thickness direction, the layers are in close contact with each other without a gap, and thus the vehicle radio wave transmission cover 1 of the embodiment is excellent in radio wave transmission.

  Moreover, in order to adhere the 1st base material 2, the decorating layer 5, and the 2nd base material 3 without gap, a thermosetting type adhesive material layer is provided between the decorating layer 5 and the second base material 3. Is more preferable. The thermosetting adhesive layer can be thermoset during insert molding. Examples of the thermosetting adhesive include epoxy resin, urethane resin, nylon resin, thermosetting silicone elastomer, and the like. These may be used alone or in combination of two or more. It is particularly preferable to use an epoxy resin because the dielectric loss tangent is low and it is difficult to be decomposed by heat during insert molding, that is, when the second base material 3 is formed.

  As shown in FIGS. 1 and 3, the front surface of the front covering portion 32 is located behind the front end portion 25 of the first base material 2 at the boundary with the first base material 2. Moreover, the 2nd base material 3 containing the front surface coating | coated part 32 consists of a non-transparent resin material, and a color and a texture differ from the 1st base material 2 which consists of a transparent resin material. For this reason, a portion of the first base material 2 located on the inner peripheral side with respect to the front cover portion 32 and the parting portion 15 appears to protrude forward while being independent of the front cover portion 32. In other words, the design part 10 is viewed independently of the frame part 11 as if it is a separate member from the frame part 11. Moreover, since the design part 10 and the frame part 11 are integrally molded, the design part 10 is visually recognized with a sense of unity with respect to the frame part 11. The design portion 10 is visually recognized as if it is an emblem, and the frame portion 11 is visually recognized as if it is an exterior member. That is, the radio wave transmission cover 1 of the embodiment seems to be a combination of a part of independent exterior members and an emblem, and both are formed with high accuracy and are arranged without gaps. looks like.

  Further, in the parting portion 15, the front surface of the first base material 2 and the front surface of the front cover portion 32 are joined at an acute angle. Specifically, the intersection angle θ between the tangent line of the front surface of the first base material 2 in the parting portion 15 and the tangent line of the front surface of the front surface covering portion 32 in the parting portion 15 is an acute angle. The crossing angle referred to here refers to a minor angle. The parting portion 15 serves as a resin flow end portion when the front cover portion 32 is molded, and unnecessary protrusions called burrs are easily formed during molding. However, by forming the parting part 15 between the first base material 2 and the front covering part 32 so that the crossing angle θ is an acute angle, burrs are hardly generated or the generated burrs are hardly visible. A radio wave transmission cover with excellent design is obtained. As shown in FIG. 3, since the front surface of the front covering portion 32 is a curved surface, the fluidity of the molten resin at the time of molding is increased compared to, for example, a curved surface. Also by this, the parting part 15 is formed with good design.

  Furthermore, since the radio wave transmission cover of the embodiment is attached to the front grill 100, the attachment portion 38 is painted in a color corresponding to the front grill, for example, a metal color. In this case, by setting the crossing angle θ to an acute angle, the mask jig can be easily attached to a portion that is not painted, that is, a portion radially inward of the attachment portion 38. For this reason, the painting operation | work of the attaching part 38 becomes easy and the electromagnetic wave transmission cover excellent in the designability can be manufactured easily. In consideration of attaching the mask jig, the crossing angle θ is preferably about 90 °, preferably 70 ° or more and 90 ° or less, and more preferably 80 ° or more and 90 ° or less.

  Further, as shown in FIG. 3, the attachment portion 38 which is a part of the second base material 3 is continuous with the outer edge portions of the rear surface covering portion 31 and the front surface covering portion 32 which are other parts of the second base material 3. However, it extends rearward, that is, in the rearward direction shown in FIG. That is, unlike the conventional radio wave transmission cover 1, the attachment portion 38 is not provided on the rear surface of the second base material 3. Instead, the attachment portion 38 itself constitutes the outer edge of the radio wave transmission cover 1, and the attachment portion 38 does not substantially protrude on the rear surface side of the second base material 3.

  In other words, in the projection view of the radio wave transmission cover 1 of the present invention attached to the exterior member of the vehicle in the horizontal direction from the front side to the rear side in the vehicle traveling direction, the region where the attachment portion 38 is projected is: It does not overlap the area where the part on the inner peripheral side of the parting portion 15 is projected. By doing so, the attachment portion 38 is unlikely to interfere with the radio wave radar device 102 arranged on the rear side of the radio wave transmission cover 1, and the radio wave transmission cover 1 and the radio wave radar device 102 can be arranged close to each other. Therefore, the distance between the radio wave emitting unit 102a and the radio wave transmission cover 1 in the radio wave radar apparatus 102 can be reduced, the radio wave transmission area in the radio wave transmission cover 1 can be reduced, and the radio wave transmission cover 1 can be downsized. In the embodiment, the attachment portion 38 extends further toward the outer peripheral side of the radio wave transmission cover than the parting portion 15. Therefore, the region where the mounting portion 38 is projected and the region where the inner peripheral portion of the parting portion 15 is projected are separated from each other. For this reason, the attachment portion 38 has an advantage that it does not interfere with the large-sized radio wave radar device 102.

  In particular, as shown in FIG. 3, the second base 3 in the radio wave transmission cover 1 of the embodiment is box-shaped, and the radio radar device 102 is accommodated inside the second base 3. The distance between the radio wave emitting unit 102a and the radio wave transmitting cover 1 can be made as small as possible. Therefore, the radio wave transmission cover 1 of the embodiment is very small.

  The attachment portion 38 does not have to be continuous over the entire circumference of the outer edge portion 31a of the rear surface covering portion 31 and the entire outer periphery of the outer edge portion 32a of the front surface covering portion 32, and may be continuous except for a part thereof. That is, the 2nd base material 3 may make the box shape by which a part of the peripheral direction in the side wall was notched. Further, the box-shaped second base material 3 may accommodate the entire radio wave radar device 102 or only a part of the radio wave radar device 102. In any case, similarly to the above, the distance between the radio wave emitting unit 102a and the radio wave transmission cover 1 in the radio wave radar device 102 can be made as small as possible, and the radio wave transmission cover 1 can be downsized.

  Further, as shown in FIG. 3, in the radio wave transmission cover 1 of the embodiment, a part of the attachment portion 38 covers the upper side of the radio wave radar device 102. For this reason, intrusion of rainwater or the like from the upper side toward the radio wave radar apparatus 102 at the time of rain can be suppressed by the mounting portion 38. Further, the other part of the attachment portion 38 covers the lower side of the radio wave radar device 102. For this reason, even if mud, water, or the like is splashed while the vehicle is running, it is blocked by the mounting portion 38 and hardly reaches the radio wave radar device 102.

  In the radio wave transmission cover 1 of the embodiment, the rear end portion of the attachment portion 38 is provided with an exterior member, that is, an engagement portion that engages with the front grill 100, and the attachment portion 38 engages with the front grill 100, The transmission cover 1 is attached to the front grill 100. However, in the radio wave transmission cover 1 of the present invention, the attachment portion 38 may be attached to the exterior member by any method. For example, a double-sided tape may be provided on the attachment portion 38, and the attachment portion 38 and the exterior member may be adhered by the double-sided tape, or the attachment portion 38 and the exterior member may be adhered with a known adhesive. . Furthermore, the attachment portion 38 and the exterior member may be welded by a known method such as vibration welding. In any case, the attachment portion 38 is not provided on the rear surface of the back surface covering portion 31 but extends from the outer edge portion 31a of the rear surface covering portion 31 and the outer edge portion 32a of the front surface covering portion 32, as described above. This is the same in that interference between the radio wave transmission cover 1 and the radio wave radar device 102 can be suppressed.

  The rear surface covering portion 31 in the radio wave transmission cover 1 of the present invention may cover the rear surface of the first base material 2. That is, as in the embodiment, the rear surface covering portion 31 may indirectly cover the rear surface of the first substrate 2 with the decorative layer 5 or other layers interposed therebetween, or the rear surface covering portion 31 is the first one. 1 The rear surface of the substrate 2 may be directly covered. In any case, the rear surface covering portion 31 covers and protects the first base material 2 and the decorative layer 5 to improve the durability of the radio wave transmission cover 1, and the design as a background of the decorative layer 5 Some design property can be imparted to the portion 10.

  The radio wave transmission cover 1 of the embodiment has a decoration layer 5 including a colored decoration portion 50 and a metallic luster portion 51. Since the colored decoration part 50 is comprised with the coating material with low light transmittance, when the 1st base material 2 is visually recognized from the front side, only the colored decoration part 50 will be displayed in the 2nd design area | region 2b, and the 1st design Only the metallic luster 51 is displayed in the region 2a. As described above, since the metallic gloss portion 51 extends not only to the first design region 2 a but also to the rear surface of the flange portion 20, a part of the metallic gloss portion 51 is the first base material 2 and the front covering portion 32. Are disposed immediately behind the parting part 15 between the design part 10 and the frame part 11. For this reason, according to the radio wave transmission cover 1 of the embodiment, the metallic luster part 51 is formed at the boundary part between the design part 10 and the frame part 11, that is, the part that is visually recognized as the outer edge of the emblem in the radio wave transmission cover 1. Can be arranged, and a metallic glossy color can be displayed on the portion.

  For example, as shown in FIGS. 4 and 5, even when the rear surface peripheral portion of the rear surface covering portion 31 is covered with a part of the first base material 2 (referred to as the peripheral surface covering portion 28), It is considered that the two base materials 3 can be firmly and integrally formed and the first base material 2, the decorative layer 5, and the rear surface covering portion 31 can be closely adhered to each other without any gaps. However, in this case, since the first base member 2 constitutes the entire front surface of the radio wave transmission cover 1, a uniform texture is given to the entire front surface of the radio wave transmission cover 1, and the first base as shown in FIG. It is visually recognized that the outer edge of the material 2 is the outer edge of the design portion 10, that is, the emblem. For this reason, in this case, the outer edge of the emblem is composed of the first base material 2 made of a transparent resin material, and the metallic gloss portion 51 cannot be disposed on the outer edge.

  Further, for example, as shown in FIGS. 6 and 7, a mode in which the front covering portion 32 is interposed in a partial region in the thickness direction of the first base material 2 in the peripheral portion of the radio wave transmission cover 1 is also conceivable. In this case, the outer edge portion of the radio wave transmission cover 1 is arranged in the order of the first base material 2 -the front surface covering portion 32 -the first base material 2 -the decorative layer 5 -the rear surface covering portion 31 from the front side to the rear side. Has a laminated structure in which are stacked. Also in this case, it is considered that the first base material 2 and the second base material 3 can be firmly integrated and the respective layers can be closely adhered without any gap. In this case, a front cover 32 is disposed on the outer edge of the radio wave transmission cover 1. However, also in this case, the front surface covering portion 32 is further covered with the first base material 2, and the front surface covering portion 32 covered with the first base material 2 is visually recognized as being a part of the design portion 10, that is, the emblem. . That is, even in this case, the entire radio wave transmission cover 1 looks as if it is an emblem. In this case, since the metallic gloss part 51 cannot be formed on the front covering part 32 that constitutes a part of the above-described laminated structure and a part of the first base material 2 is laminated on the front side and the rear side. However, the metallic luster part 51 cannot be arranged on the outer edge of the design part 10, that is, the outer edge of the emblem.

  On the other hand, according to the radio wave transmission cover 1 of the embodiment, the metallic gloss part 51 can be disposed on the outer edge of the emblem as shown in FIGS.

  Note that the metallic gloss portion 51 may extend from directly behind the parting portion 15 to the inner peripheral side portion of the design portion 10, but not limited thereto, the end of the metallic gloss portion 51 may be in the vicinity of the parting portion 15. For example, it is possible to display a metallic gloss color on a portion that is visually recognized as the outer edge of the emblem.

  The radio wave transmission cover 1 of the embodiment has the decoration layer 5 including the colored decoration part 50 and the metallic luster part 51, but the radio wave transmission cover 1 of the present invention may not have the decoration layer 5. For example, an uneven shape may be provided on the rear surface of the first base material 2 and / or the front surface of the rear surface covering portion 31, and the design may be displayed by the uneven shape. Alternatively, the radio wave transmission cover 1 of the present invention may be provided with a decoration layer 5 made of only one of the colored decoration portion 50 or the metallic luster portion 51.

  The decoration layer 5 is a layer for displaying a design as described above, and may be made of a material different from the first base material 2 in any one of saturation, brightness, transparency, and light refractive index. . For example, the decoration layer 5 may be made of resin, or may be composed of paint, metal, or the like. The decoration layer 5 may be directly formed on the first base material 2 and / or the second base material 3. Examples of the method for directly forming the decoration layer 5 on the first base material 2 and / or the second base material 3 include methods such as printing, multicolor molding such as two-color molding, and vapor deposition. When the metal decoration layer 5 is formed by vapor deposition, it is preferable to select a metal material deposited in an island shape such as indium, tin, or gold in consideration of radio wave transmission. Alternatively, the decorative layer 5 may be formed separately from the first base material 2 and the second base material 3. As a method of forming the decorative layer 5 separately from the first base material 2 and the second base material 3, the decorative layer 5 formed by a method such as printing or vapor deposition on the resin sheet is inserted together with the resin sheet. The method of integrating with the 1st base material 2 and / or the 2nd base material 3 by methods, such as shaping | molding and adhesion | attachment, is illustrated.

  Moreover, it is preferable that the relative dielectric constant of the transparent resin material which comprises the 1st base material 2 and the opaque resin material which comprises the 2nd base material 3 is substantially the same. Specifically, these dielectric constants are preferably 2.7 ± 1.5 at room temperature and 76.5 GHz. Similarly, it is preferable to select a coating layer having a relative dielectric constant within the above range. Furthermore, when interposing the decoration layer 5 between the 1st base material 2 and the 2nd base material 3, more specifically between the 1st base material 2 and the back surface coating | coated part 31, the said decoration The relative dielectric constant of the layer 5 is also preferably in the above-mentioned range.

  In the radio wave transmission cover 1 according to the present invention, the first base member 2 and the rear surface covering portion 31, and in some cases, the design portion 10 composed of the decorative layer 5 and / or the coat layer are mainly used for the radio wave radar device 102. Arranged on the front side. Therefore, it is preferable that the thickness of the design portion 10 is constant in consideration of radio wave permeability. Here, the constant thickness of the design portion 10 is a concept including substantially constant thickness. Specifically, when the maximum thickness of the design portion 10 is 100%, a variation of -0.2% can be allowed.

  The first base material 2 and the second base material 3 can be integrally molded by a method such as a two-color molding method in addition to the insert molding method described above. Also in this case, the first base material 2 and the second base material 3, or the first base material 2, the decoration layer 5, and the second base material 3 can be joined to each other without any gaps. Radio wave permeability can be improved.

  The radio wave transmission cover 1 of the present invention is mounted on a vehicle and can be attached to various vehicle exterior members, not limited to the front grill 100.

(Note 1)
The present invention is not limited to the embodiments described above and shown in the drawings, and can be implemented with appropriate modifications within the scope not departing from the gist.

(Note 2)
The vehicle radio wave transmission cover of the present invention is a vehicle radio wave transmission cover 1 disposed on the front side of the radio wave radar device 102, and
A first base material 2 made of a transparent resin material and a second base material 3 made of an opaque resin material and molded integrally with the first base material 2;
The second base 3 is
A rear surface covering portion 31 covering the rear surface side of the first base material 2, and
A front covering portion 32 covering at least a part of the peripheral edge portion on the front surface side of the first base member 2;
And an attachment portion 38 that continues to the outer edge portion of the rear surface covering portion 31 and the front surface covering portion 32 and extends rearward.

The radio wave transmission cover of the present invention preferably includes any of the following (1) to (3), and more preferably includes a plurality of (1) to (3).
(1) The parting portion 15 between the front covering portion 32 and the first base material 2 is on the rear side of the front end portion 25 of the first base material 2.
(2) The second base material 3 has a box shape in which the rear surface covering portion 31 and the front surface covering portion 32 are used as a top wall and the mounting portion 38 is used as a side wall so that the radio wave radar device 102 can be accommodated.
(3) Furthermore, a decorative layer 5 interposed between the first base material 2 and the second base material 3 is provided,
The decorative layer 5 has a metallic luster 51 having a metallic luster,
The metallic gloss part 51 is disposed immediately behind at least a part of the parting part 15 between the front covering part 32 and the first base material 2.

1: Radio wave transmission cover for vehicle 2: First base material 3: Second base material 5: Decorating layer 15: Parting part 25 between the front covering portion and the first base material 25: Front end portion 31 of the first base material: Rear surface Cover part 32: Front cover part 38: Mounting part 51: Metal gloss part 102: Radio wave radar device

Claims (3)

A radio wave transmission cover for a vehicle disposed on the front side of a radio wave radar device,
A first base material made of a transparent resin material, and a second base material made of an opaque resin material and molded integrally with the first base material,
The second base material is
A rear surface covering portion covering the rear surface side of the first base material;
A front cover covering at least a part of the peripheral edge on the front side of the first substrate;
Have a, and a mounting portion extending continuously rearward outer edge of the front cover section and the rear surface covering portion,
The parting part between the front covering portion and the first base is on the rear side of the front end of the first base,
The radio wave transmission cover for a vehicle , wherein an intersection angle between a tangent line of the front surface of the first base material in the parting part and a tangent line of the front surface of the front covering part in the parting part is an acute angle . 2. The radio wave transmission cover for a vehicle according to claim 1, wherein the second base material has a box shape in which the rear surface covering portion and the front surface covering portion are a top wall, the attachment portion is a side wall and the radio wave radar device can be accommodated. Furthermore, a decorative layer interposed between the first base material and the second base material is provided,
The decorative layer has a metallic luster having a metallic luster,
3. The radio wave transmission cover for a vehicle according to claim 1, wherein the metallic luster portion is disposed immediately behind at least a part of a parting portion between the front surface covering portion and the first base material.

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