JP7096139B2 - Radome for in-vehicle radar equipment and its manufacturing method - Google Patents

Description

The present invention relates to a radome for an in-vehicle radar device, and relates to a radome for an in-vehicle radar device having a plurality of background colors and a method for manufacturing the radome.

Conventionally, as a radome for an in-vehicle radar device having a plurality of background colors, there is a radome of Patent Document 1 having two colors, black in a print layer and silver in a paint layer, as a background color of a brilliant discontinuous metal film. When manufacturing the redome of Patent Document 1, printing is applied to the print layer forming region on the back surface of the transparent resin member to form a black print layer, and then the region where the emblem is formed is covered with a coating mask and painted. A silver coating layer is formed by painting on the back surface of the transparent resin member excluding the mask. Further, a resin is separately injection-molded to form an inner core, a discontinuous metal is formed by vacuum deposition or sputtering so as to cover the surface of the inner core, and the inner core on which the discontinuous metal is formed is housed in a transparent resin member. A radome can be obtained by accommodating it in the recess.

Japanese Unexamined Patent Publication No. 2018-105741

By the way, when manufacturing the redome of Patent Document 1, in the step before painting, the back surface of the transparent resin member is exposed in the region where the emblem having the black printed characters in the center is formed. When painting is performed by applying a paint mask to the area where the emblem of the transparent resin member in such a state is formed, the paint seeps into the gap between the paint mask and the exposed transparent resin member, and the boundary of the paint layer is blurred and visually recognized. It may be in a state of being painted. In addition, the painting process using a painting mask complicates the work, and causes problems such as a decrease in work efficiency and an increase in manufacturing cost.

The present invention is proposed in view of the above problems, and can be decorated and manufactured without using a coating mask, and the boundary of the decorative layer is sharpened, the efficiency of the decorating work is improved, and the manufacturing cost is increased. It is an object of the present invention to provide a radome for an in-vehicle radar device having a plurality of background colors and a method for manufacturing the radome, which can reduce the number of radomes.

The radome for an in-vehicle radar device of the present invention has a first background color viewing range in which the first background color of the first background color printing layer is visually recognized from the surface side of the transparent substrate, and a second background from the surface side of the transparent substrate. A second background color viewing range in which a second background color different from the first background color of the color decoration layer is visually recognized, and the first background color and the second background color from the surface side of the transparent substrate. An electromagnetic wave-transmitting metal layer viewing range is provided in which an electromagnetic wave-transmitting metal layer having a different appearance from any of the background colors is visually recognized, and at least the first background color viewing range located around the second background color viewing range is provided. The second background color is also on the back side of the first background color printing layer and the back side of the electromagnetic wave transmitting metal layer in the electromagnetic wave transmitting metal layer viewing range located around the second background color viewing range. It is characterized in that a decorative layer is provided. The transparent substrate includes both a single transparent substrate and a transparent substrate having a transparent substrate layer formed on the back surface side of the transparent substrate.
According to this, the second background color decorative layer is located around the second background color viewing range, and the back side of the first background color printing layer in the first background color viewing range and the electromagnetic wave in the electromagnetic wave transmitting metal layer viewing range. By providing it on the back side of the transparent metal layer as well, it is possible to eliminate blurring when a paint mask is used and to sharpen the boundary of the decorative layer. Furthermore, since it is possible to decorate and manufacture without using a painting mask, it is possible to prevent the decoration work from becoming complicated, to improve the efficiency of the decoration work of the decoration layer, and to reduce the manufacturing cost. can. Further, since an electromagnetic wave transmitting metal layer is formed on the back surface of the transparent substrate, for example, a resin is separately injection-molded to form an inner core, and a metal is formed so as to cover the surface of the inner core, and this metal is manufactured. The work of accommodating the filmed inner core in the accommodating recess of the transparent resin member becomes unnecessary, and from this point as well, the efficiency of the manufacturing work and the reduction of the manufacturing cost can be achieved.

In the radome for an in-vehicle radar device of the present invention, the first background color printing layer in the first background color viewing range and the second background color decorative layer in the second background color viewing range are adjacent to each other in surface view. The transparent substrate is formed on the back surface where the depth positions of the transparent substrate are substantially different from each other, and the second background color decorative layer in the second background color viewing range and the electromagnetic wave transmitting metal layer in the electromagnetic wave transmitting metal layer viewing range are formed. It is characterized in that the transparent substrate is formed on a back surface having substantially different depth positions at positions adjacent to each other in the surface view.
According to this, the first background color printing layer in the first background color viewing range, the second background color decorative layer in the second background color viewing range, and the electromagnetic wave transmitting metal layer in the electromagnetic wave transmitting metal layer viewing range are Due to the difference in the depth position of the transparent substrate of the three, it is possible to increase the visual three-dimensional effect of the mark such as the emblem and the mark forming area shown by the combination of the three, and to enrich the three-dimensional visual expression. can do.

In the radome for an in-vehicle radar device of the present invention, the mark symbol portion is composed of the second background color decorative layer in the second background color viewing range and the electromagnetic wave transmitting metal layer in the electromagnetic wave transmitting metal layer viewing range. Alternatively, the second background color decorative layer is composed of the second background color decorative layer in the second background color viewing range, and the second background color decorative layer is a second background color coating layer, a second background color vapor deposition layer, and a second background. It is characterized by being one of the color spatter layers.
According to this, by forming the mark symbol portion such as the emblem symbol portion other than the print layer, the shape of the surface region of the transparent substrate on which the mark symbol portion is formed can freely have three-dimensional unevenness as needed. Further, it is possible to eliminate the need to make the peripheral edge of the surface region perpendicular to the surface region, to make the peripheral edge of the surface region an inclined surface, and to form a mark symbol portion on the inclined surface. Therefore, it is possible to increase the three-dimensional effect of the mark symbol portion or the mark symbol portion and its surroundings, and it is also possible to increase the variety of three-dimensional visibility. When the mark symbol portion is formed by the print layer, it is necessary to flatten the shape of the surface region of the transparent substrate on which the mark symbol portion is formed, and further, the peripheral edge of the surface region is not formed at a right angle. And the borders due to printing tend to blur.

The radome for an in-vehicle radar device of the present invention is characterized in that the transparent substrate is a transparent substrate made of synthetic resin, glass or ceramic.
According to this, when the back surface of the transparent substrate is the back surface of a transparent base material made of synthetic resin, glass or ceramic, when painting is performed by applying a paint mask, the gap between the paint mask and the back surface of the exposed transparent base material is obtained. The paint is more likely to permeate into the glass, and bleeding is likely to occur. However, such a situation can be eliminated and the boundary of the decorative layer can be made clear.

The method for manufacturing a redo for an in-vehicle radar device of the present invention is a method for manufacturing a redo for an in-vehicle radar device of the present invention, which is transparent in which at least the first background color printing layer and the electromagnetic wave transmitting metal layer are formed. Along with decorating the first region on the back surface of the substrate between the first background color printing layer and the electromagnetic wave transmitting metal layer where the first background color printing layer and the electromagnetic wave transmitting metal layer are not formed. The second region on the back surface side of the first background color printing layer located around the first region and the third region on the back surface side of the electromagnetic wave transmitting metal layer located around the first region. It is characterized by comprising a decoration step of forming the second background color decoration layer by decorating the first region with the decoration.
According to this, in forming the second background color decorative layer, when painting the first region where the first background color printing layer and the electromagnetic wave transmitting metal layer are not formed, the position is located around the first region. By allowing the second region on the back side of the first background color printing layer and the third region on the back side of the electromagnetic wave transmitting metal layer to be decorated, decoration work such as electroless plating, vapor deposition, or spattering can be performed. It can be simplified and the allowable range of decoration accuracy can be expanded.

The method for manufacturing a redo for an in-vehicle radar device of the present invention includes a first step of printing a first background color on the back surface of a transparent substrate to form the first background color printing layer before the decoration step. At least, the back surface of the transparent substrate corresponding to the second background color viewing range in which the second background color different from the first background color is visually recognized from the surface side of the transparent substrate is covered with a photomask, and the above-mentioned The second step of forming a modified surface by light irradiation on the back surface of the transparent substrate corresponding to the visible range of the electromagnetic wave transmitting metal layer in which the electromagnetic wave transmitting metal layer is visually recognized from the surface side of the transparent substrate, and the electrolytic plating treatment are performed. It is characterized in that a third step of forming the electromagnetic wave transmitting metal layer of the discontinuous metal layer on the modified surface is performed.
According to this, the formation of the electromagnetic wave transmitting metal layer on the surface other than the modified surface is eliminated, and the amount of metal used for forming the electromagnetic wave transmitting metal layer such as the discontinuous metal layer is reduced to reduce the manufacturing cost. At the same time, it is possible to make effective use of precious metal resources. In addition, for example, it can be applied to redomes of various shapes at low cost by eliminating the increase in equipment cost when performing vacuum sputtering and vacuum deposition, and the restrictions on the size and shape of the transparent substrate to be deposited by the vacuum container. It will be possible.

The method for manufacturing a redo for an in-vehicle radar device of the present invention includes a first step of printing a first background color on the back surface of a transparent substrate to form the first background color printing layer before the decoration step. At least, the back surface of the transparent substrate corresponding to the second background color viewing range in which the second background color different from the first background color is visually recognized from the surface side of the transparent substrate is covered with a metal mask, and the above-mentioned The second step of forming the electromagnetic wave transmitting metal layer in the region including the back surface of the transparent substrate corresponding to the electromagnetic wave transmitting metal layer visible range in which the electromagnetic wave transmitting metal layer is visually recognized from the surface side of the transparent substrate, and the metal. It is characterized in that a third step of removing the mask is performed.
According to this, it becomes possible to form an electromagnetic wave transmitting metal layer by thin film deposition, sputtering, electroless plating, or the like, and it is possible to increase the degree of freedom in the manufacturing process.

The method for manufacturing a redo for an in-vehicle radar device of the present invention includes a first step of printing a first background color on the back surface of a transparent substrate to form the first background color printing layer before the decoration step. From the back surface side of the transparent substrate corresponding to the second background color viewing range in which a second background color different from the first background color is visually recognized from the surface side of the transparent substrate, and from the front surface side of the transparent substrate. In the second step of forming the electromagnetic wave transmitting metal layer in the region including the back surface of the transparent substrate corresponding to the electromagnetic wave transmitting metal layer viewing range in which the electromagnetic wave transmitting metal layer is visually recognized, and in the second background color viewing range. It is characterized in that a third step of removing the electromagnetic wave transmitting metal layer formed on the back surface of the corresponding transparent substrate by laser irradiation is performed.
According to this, it is possible to peel off the electromagnetic wave transmitting metal layer in a free shape at high speed and with high accuracy by laser irradiation, and the electromagnetic wave formed on the back surface of the transparent substrate corresponding to the second background color viewing range. It is possible to reliably remove the transparent metal layer and prevent the electromagnetic wave transmitting metal layer or a part thereof from remaining in the second background color viewing range by any chance, and the second background in the second background color viewing range can be prevented. Good visibility of the color decorative layer can be ensured. Further, the treatment for removing the electromagnetic wave transmitting metal layer by laser irradiation can be performed at low cost, and the manufacturing cost can be further reduced. Further, this manufacturing process can be performed without using a mask, and the manufacturing cost can be reduced from this point as well. Further, it is possible to form an electromagnetic wave transmitting metal layer by vapor deposition, sputtering, electroless plating, or the like, and it is possible to increase the degree of freedom in the manufacturing process.

According to the present invention, a radome for an in-vehicle radar device having a plurality of background colors can be decorated and manufactured without using a painting mask, and the boundary of the decorative layer can be sharpened and the decoration work can be performed. It is possible to improve efficiency and reduce manufacturing costs.

The front view of the radome for the vehicle-mounted radar apparatus of embodiment according to this invention. FIG. 1 is an enlarged sectional view taken along the line AA of FIG. (A) to (e) are schematic explanatory views illustrating the manufacturing process of the radome for an in-vehicle radar device of the embodiment. (A) to (e) are schematic explanatory views explaining the first modification of the manufacturing process of the radome for the vehicle-mounted radar apparatus of embodiment. (A) to (e) are schematic explanatory views explaining the second modification of the manufacturing process of the radome for the vehicle-mounted radar apparatus of embodiment. (A) is a schematic partial cross-sectional view of a radome for an in-vehicle radar device of a first modification, (b) is a schematic partial cross-sectional view of a radome for an in-vehicle radar device of a second modification, and (c) is a schematic partial cross-sectional view of a radome for an in-vehicle radar device of the second modification. Schematic partial cross-sectional view of a radome for radar equipment.

[Radome for in-vehicle radar device of embodiment]
As shown in FIGS. 1 and 2, the radome 1 for an in-vehicle radar device according to the present invention has an insulating transparent base material 2 visible from the surface side corresponding to the transparent base material of the present embodiment and a transparent base. An insulating support member 3 provided on the back surface side of the material 2 to support the transparent base material 2 is provided, and the support member 3 is formed in a predetermined shape to support the transparent base material 2.

The transparent base material 2 in the present embodiment is an insulating transparent resin, and is a colorless synthetic resin having a plate thickness of 2 mm and a visible light transmittance of 50% or more. As the transparent base material 2, an appropriate material such as synthetic resin, glass, ceramics, etc. can be used within the scope of the present invention, but it is preferable to use an insulating transparent synthetic resin. Further, the transparent base material 2 is preferably a colorless material or a colored material having a visible light transmittance of 50% or more in order to ensure good visibility. Further, the transparent substrate in the present invention is preferably a transparent substrate such as synthetic resin, glass, or ceramics, but on the back side of the transparent substrate, acrylic resin, polyurethane resin, polyester resin, silicon resin, epoxy resin, etc. It is also possible to form a transparent base layer such as a synthetic resin such as a fluororesin, a vinyl resin, a styrene resin, an amino resin, a phenol resin, a nitrocellulose resin, and a melamine resin. When the transparent substrate is a single transparent substrate made of synthetic resin, glass or ceramic, if painting is performed with a coating mask, the paint can more easily penetrate into the gap between the coating mask and the back surface of the exposed transparent substrate. Although bleeding is likely to occur, in the present embodiment, such a situation can be eliminated and the boundary of the coating layer can be surely sharpened.

When the transparent base material 2 is an insulating transparent synthetic resin, the material is appropriate to the extent applicable, and is, for example, polycarbonate (PC), polypropylene methacrylate (PMMA), acrylonitrile-butadiene-styrene copolymer (ABS). ), Polyethylene terephthalate (PET), polyethylene (PE), polypropylene (PP), acrylic nitrile-styrene copolymer (AS), polystyrene (PS), cycloolefin polymer (COP), etc. alone or in combination of two or more. Can be used in combination, or may contain an additive.

The support member 3 is formed of, for example, an insulating synthetic resin and is provided so as to be fixed to the second background color coating layer 6 described later, and the transparent base material 2 is fitted into the frame portion 31 of the support member 3. The transparent base material 2 is fixed. When the support member 3 is an insulating synthetic resin, the material is appropriate to the extent applicable, and for example, polycarbonate (PC), polymethylmethacrylate (PMMA), acrylonitrile-butadiene-styrene copolymer (ABS), polyethylene. Telephthalate (PET), Polyethylene (PE), Polypropylene (PP), Acrylonitrile-Stylized Copolymer (AS), Polystyrene (PS), Cycloolefin Polymer (COP), Acrylonitrile-Ethethylenepropyl Rubber-Stylized Copolymer (AES) , PC / ABS, PC / PET and other polycarbonate resins, styrene-acrylonitrile copolymer (SAN), acrylonitrile-butyl acrylate rubber-styrene copolymer (AAS), acrylonitrile-polyethylene chloride-styrene copolymer (ACS). , Polybutylene terephthalate (PBT), polyvinyl chloride (PVC), polyamide (PA), polyacetal (POM), polyether sulfone (PES), thermoplastic polyimide (PI), polyether ketone (PEK), polyether ether ketone (PEEK), Polyphenylene Sulfide (PSU), Cellulose Acetate (CA), Cellulose Acetate Butyrate (CAB), Ethyl Cellulose (EC), Liquid Polymer (LCP), Polyphenylene Sulfide (PPS), Polyurethane-based Thermoplastic Elastoma (TPU), One kind such as a polyester-based thermoplastic elastoma (TPEE) and an olefin-based thermoplastic elastoma (TPO) can be used alone or in combination of two or more, or an additive may be contained.

On the back side of the transparent base material 2, a first background color printing layer 4 printed on the back side of the transparent base material 2 and an electromagnetic wave formed on the back side of the transparent base material 2 by electrolytic plating, vapor deposition, sputtering, or the like. An electromagnetic wave-transmitting metal layer 5 such as a discontinuous metal layer having a transmissive and metallic luster, and a second background color coating layer 6 coated on the back surface side of the transparent base material 2 corresponding to the second background color decorative layer. The first background color of the first background color printing layer 4 and the second background color of the second background color coating layer 6 are different colors, and the electromagnetic wave transmitting metal layer 5 is the first background color and the above. The appearance is different from any of the second background colors. If the first background color and the second background color are different colors, the combination is appropriate, and for example, a blue or purple second background color can be used with respect to the black first background color. The electromagnetic wave transmitting metal layer 5 can be an appropriate electromagnetic wave transmitting metal layer, for example, in addition to a discontinuous metal layer having electromagnetic wave transparency and integral visibility with metal gloss, vapor deposition or A semiconductor layer such as silicon or germanium formed by sputtering, or a metal having a visible light reflectance of 50% or more (for example, gold, silver, copper, aluminum, platinum, palladium, iron, nickel, chromium) or the like. It can be an alloy layer with a bright metal.

Further, in the transparent base material 2, the first background color viewing range 21 in which the first background color is visually recognized from the surface side of the transparent base material 2 and the second background color are visually recognized from the surface side of the transparent base material 2. A second background color viewing range 22 and an electromagnetic wave transmitting metal layer viewing range 23 in which the electromagnetic wave transmitting metal layer 5 is visually recognized from the surface side of the transparent base material 2 are provided. A step is formed on the back surface 26 of the transparent base material 2, and the position in the depth direction of the back surface 26p of the transparent base material 2 corresponding to the first background color viewing range 21 and the second background color viewing range 22. The position in the depth direction of the back surface 26q of the corresponding transparent base material 2 is formed so as to be different from each other, and the position in the depth direction of the back surface 26q of the transparent base material 2 corresponding to the second background color viewing range 22 and the electromagnetic wave transmission. The transparent base material 2 corresponding to the visible range 23 of the sex metal layer is formed so that the positions of the back surface 26r in the depth direction are different from each other. The surface 27 of the transparent base material 2 in the illustrated example is formed into a curved surface or a flat surface having no step.

In the present embodiment, the depth direction of the back surface 26q of the transparent base material 2 corresponding to the second background color viewing range 22 is larger than the position in the depth direction of the back surface 26p of the transparent base material 2 corresponding to the first background color viewing range 21. Is formed so as to be arranged on the front surface side, and corresponds to the electromagnetic wave transmitting metal layer viewing range 23 rather than the position in the depth direction of the back surface 26q of the transparent base material 2 corresponding to the second background color viewing range 22. The back surface 26r of the transparent substrate 2 is formed so that the position in the depth direction is arranged on the front surface side. The back surfaces 26p, 26q, and 26r of the transparent base material 2 may have a planar shape or a curved surface shape, respectively.

The first background color printing layer 4 is fixedly formed on the back surface 26p of the transparent base material 2 corresponding to the first background color viewing range 21, and further, an electromagnetic wave transmitting metal is formed on the back surface side of the first background color printing layer 4. The layer 5 and the second background color coating layer 6 are sequentially laminated and fixed. The second background color coating layer 6 is fixedly formed on the back surface 26q of the transparent base material 2 corresponding to the second background color viewing range 22. An electromagnetic wave transmitting metal layer 5 is fixedly formed on the back surface 26r of the transparent base material 2 corresponding to the electromagnetic wave transmitting metal layer viewing range 23, and further, a second background color coating is applied to the back surface side of the electromagnetic wave transmitting metal layer 5. The layers 6 are laminated and fixed.

That is, the first background color printing layer 4 of the first background color viewing range 21 and the second background color coating layer 6 of the second background color viewing range 22 are adjacent to each other in the surface view of the transparent base material 2. The second background color coating layer 6 of the second background color viewing range 22 and the electromagnetic wave transmitting metal layer 5 of the electromagnetic wave transmitting metal layer viewing range 23, which are formed on the back surface 26p and the back surface 26q having different depth positions, are surface-viewed. The transparent substrate 2 is formed on the back surface 26q and the back surface 26r in which the depth positions of the transparent base materials 2 are different from each other at positions adjacent to each other. Further, on the back side of the first background color printing layer 4 of the first background color viewing range 21 and the back side of the electromagnetic wave transmitting metal layer 5 of the electromagnetic wave transmitting metal layer viewing range 23 other than the second background color viewing range 22. Also, a second background color coating layer 6 is provided.

The second background color coating layer 6 is entirely on the back side of the first background color printing layer 4 of the first background color viewing range 21 and the back side of the electromagnetic wave transmitting metal layer 5 of the electromagnetic wave transmitting metal layer viewing range 23. The back side of the first background color printing layer 4 of the first background color viewing range 21 located around the second background color viewing range 22 and the second background color viewing range 22 are not limited to the configuration provided. The present invention includes a configuration in which the second background color coating layer 6 is provided on the back surface side of the electromagnetic wave transmitting metal layer 5 in the electromagnetic wave transmitting metal layer viewing range 23 located around the range 22.

Further, in the in-vehicle radar device reddome 1 of the present embodiment, the mark symbol portion 7 which is the character portion or symbol portion of the mark such as the emblem corresponds to the second background color decorative layer of the second background color viewing range 22. It is composed of a second background color coating layer 6 and an electromagnetic wave transmitting metal layer 5 having an electromagnetic wave transmitting metal layer viewing range 23. The mark symbol portion 7 is composed of a second background color decorative layer other than the print layer of the second background color viewing range 22, and the electromagnetic wave transmitting metal layer 5 of the electromagnetic wave transmitting metal layer viewing range 23, or is composed of a second background color decorative layer. The second background color decorative layer is preferably composed of a second background color decorative layer other than the print layer having the two background color viewing range 22, and the second background color decorative layer is a second background color vapor deposition layer other than the second background color coating layer 6. Alternatively, it can be used as a second background color spatter layer or the like.

According to the vehicle-mounted radar device radome 1 of the present embodiment, the first background color printing layer 4 of the first background color viewing range 21 in which the second background color coating layer 6 is located around the second background color viewing range 22. By providing it on the back side and the back side of the electromagnetic wave transmitting metal layer 5 in the electromagnetic wave transmitting metal layer viewing range 23, it is possible to paint and manufacture without using a painting mask, and when a painting mask is used, it is possible to manufacture. It is possible to eliminate the blurring of the boundary of the coating layer due to the penetration of the paint in the above, and to clarify the boundary of the coating layer. Further, since it is possible to paint and manufacture without using a painting mask, it is possible to prevent the painting work from becoming complicated, to improve the efficiency of the painting work, and to reduce the manufacturing cost.

Further, since the electromagnetic wave transmitting metal layer 5 is formed on the back surface 26r of the transparent base material 2, a resin is separately injection-molded to form an inner core, and a discontinuous metal or the like is formed so as to cover the surface of the inner core. However, the work of accommodating the inner core formed of the discontinuous metal or the like into the accommodating recess of the transparent resin member becomes unnecessary, and from this point as well, the efficiency of the manufacturing operation and the reduction of the manufacturing cost can be achieved. Further, the first background color printing layer 4 of the first background color viewing range 21, the second background color coating layer 6 of the second background color viewing range 22, and the electromagnetic wave transmitting metal layer of the electromagnetic wave transmitting metal layer viewing range 23. Due to the difference in the depth position of the transparent base material 2 of the three parties, it is possible to increase the visual three-dimensional effect of the mark such as the emblem and the mark forming area shown by the combination of the three parties, and also to provide a three-dimensional visual expression. Can be enriched.

Further, by forming the mark symbol portion 7 such as the emblem symbol portion other than the print layer, the shape of the surface region of the transparent base material 2 on which the mark symbol portion 7 is formed can be freely formed with three-dimensional unevenness as needed. It is possible to have it, and further, it is not necessary to make the peripheral edge of the surface area at a right angle, the peripheral edge of the surface area is made an inclined surface, and a part of the mark symbol portion 7 is formed on this inclined surface. Is possible. Therefore, the three-dimensional effect of the mark symbol portion 7 or the mark symbol portion 7 and its surroundings can be increased as needed, and the variety of three-dimensional visibility can be increased.

[Example of Manufacturing Process of Radome for In-Vehicle Radar Device of Embodiment]
Next, an example of a manufacturing process of the radome 1 for an in-vehicle radar device according to the embodiment will be described. The radome 1 for an in-vehicle radar device of the embodiment can be manufactured by using, for example, the manufacturing process shown in FIG. In the manufacturing process example of FIG. 3, a transparent base material 2 having a stepped back surface 26p, 26q, 26r formed is used, and a first background color is printed on the back surface 26p of the transparent base material 2 to print a first background color printing layer. 4 is formed (see FIGS. 3 (a) and 3 (b)). The printing step of the first background color can be performed by using an appropriate printing method such as silk screen printing, and the same applies to the manufacturing steps of the first modification and the second modification described later. Even when the transparent base layer is provided on the back surface of the transparent base material 2, the same process as in the present manufacturing process example can be applied.

After that, as shown in FIGS. 3 (c) and 3 (d), the back surface 26q of the transparent base material 2 corresponding to the second background color viewing range 22 is covered with the photo mask 11 to correspond to the electromagnetic wave transmitting metal layer viewing range 23. The modified surface 25 is formed on the back surface 26r of the transparent substrate 2 by light irradiation, and the modified surface 25 is similarly irradiated on the back surface of the first background color printing layer 4 corresponding to the back surface 26p of the transparent substrate 2. Is further subjected to electroless plating treatment to form an electromagnetic wave transmitting metal layer 5 of a discontinuous metal layer on the modified surface 25 and the modified surface on the back surface of the background color printing layer 4.

In the process of forming the modified surface and performing the electrolytic plating treatment, at least the back surface 26q of the transparent base material 2 corresponding to the second background color viewing range 22 is covered with the photomask 11 so that the electromagnetic wave transmitting metal layer viewing range is visible. The modified surface 25 is formed on the back surface of the transparent base material 2 corresponding to 23 by light irradiation, and further subjected to electroless plating treatment to form the electromagnetic wave transmitting metal layer 5 of the discontinuous metal layer on the modified surface 25. Just do it. For example, the back surface side of the first background color printing layer 4 is also covered with the photo mask 11 together with the back surface 26q of the transparent base material 2, and the back surface 26r of the transparent base material 2 corresponding to the electromagnetic wave transmitting metal layer viewing range 23 is irradiated with light. It is also possible to form the modified surface 25 and apply electroless plating treatment to form the electromagnetic wave transmitting metal layer 5 of the discontinuous metal layer on the modified surface 25. In this case, the first background It is a radome for an in-vehicle radar device having a structure in which a second background color coating layer 6 is laminated and fixed on the back surface of the color printing layer 4.

Further, the light irradiation for forming the modified surface 25 on the back surface 26r of the transparent base material 2 is directly bonded to the reaction nucleus of the discontinuous metal layer of the electromagnetic wave transmitting metal layer 5, or when a chemical solution such as a conditioning solution is used. It is appropriate as long as a reactive functional group that indirectly binds to the reaction nucleus of the discontinuous metal layer of the electromagnetic wave transmitting metal layer 5 can be formed on the back surface 26r of the transparent base material 2, and for example, ultraviolet irradiation is preferable. Yes, and it is good to use infrared irradiation. When the modified surface 25 is formed by infrared irradiation, the surface is modified by the heat energy generated by absorbing infrared rays on the back surface 26r, so that the wavelength is longer than the visible light region and the transparent resin or the like is used. It is a requirement to irradiate infrared rays in the wavelength band absorbed by the transparent base layer 2 or the transparent base layer such as a transparent resin with laser light or the like at the energy density or output required for modification.

Further, the electromagnetic wave transmitting metal layer 5 of the electromagnetic wave transmitting discontinuous metal layer formed by electroless plating is, for example, nickel or nickel alloy, chromium or chromium alloy, cobalt or cobalt alloy, tin or tin alloy, copper or copper. It can be composed of alloys, silver or silver alloys, palladium or palladium alloys, platinum or platinum alloys, rhodium or rhodium alloys, gold or gold alloys and the like.

After that, as shown in FIG. 3 (e), the first background color printing layer 4 and the electromagnetic wave transmitting metal on the back surface 26 of the transparent base material 2 on which the first background color printing layer 4 and the electromagnetic wave transmitting metal layer 5 are formed. The first background color viewing range 21 and the second, including the region where the first background color printing layer 4 between the layers 5 and the electromagnetic wave transmitting metal layer 5 are not formed (the region corresponding to the back surface 26q in the illustrated example). The entire area corresponding to the background color viewing range 22 and the electromagnetic wave transmitting metal layer viewing range 23 is painted with a paint having a color different from that of the first background color to form the second background color coating layer 6. Further, a support member 3 is attached to the back surface side of the transparent base material 2 on which the first background color printing layer 4, the electromagnetic wave transmitting metal layer 5, and the second background color coating layer 6 are formed, and the radome 1 for an in-vehicle radar device is completed. do.

In this painting step, at least the first background color printing layer 4 and the electromagnetic wave transmitting metal layer 5 on the back surface 26 of the transparent base material 2 on which the first background color printing layer 4 and the electromagnetic wave transmitting metal layer 5 are formed are formed. The first area (the area corresponding to the back surface 26q in the illustrated example) where the first background color printing layer 4 and the electromagnetic wave transmitting metal layer 5 are not formed is painted, and the first area is located around the first area. 1 The second region on the back side of the background color printing layer 4 (corresponding to the back side of the region where the first background color printing layer 4 and the electromagnetic wave transmitting metal layer 5 in FIG. 3E are laminated) and the first region. In the third region on the back surface side of the electromagnetic wave transmitting metal layer 5 located around the above (corresponding to the back surface side of the region provided only with the electromagnetic wave transmitting metal layer 5 in FIG. 3 (e)), to the first region. The second background color coating layer 6 may be formed by coating with the coating of.

According to this manufacturing process example, the film formation of the electromagnetic wave transmitting metal layer 5 on a surface other than the modified surface is eliminated, the amount of metal used for forming the electromagnetic wave transmitting metal layer 5 is reduced, and the manufacturing cost is reduced. At the same time, it is possible to make effective use of precious metal resources. Further, for example, the increase in equipment cost in the case of vacuum sputtering or vacuum deposition, the restriction on the size and shape of the transparent base material 2 to be deposited by the vacuum container, etc. are eliminated, and it can be applied to redomes of various shapes at low cost. Is possible. Further, in forming the second background color coating layer 6, it is located around the first region when the first region in which the first background color printing layer 4 and the electromagnetic wave transmitting metal layer 5 are not formed is painted. By allowing coating on the second region on the back surface side of the first background color printing layer 4 and the third region on the back surface side of the electromagnetic wave transmitting metal layer 5, the coating operation is simplified and the allowable range of coating accuracy is increased. Can be expanded.

[First modification of the manufacturing process of the radome for the in-vehicle radar device of the embodiment]
Next, a first modification of the manufacturing process of the radome 1 for an in-vehicle radar device according to the embodiment will be described. In the manufacturing process of the first modification, first, as in the printing process of FIG. 3, the transparent base material 2 on which the stepped back surface 26p, 26q, 26r is formed is used, and the first surface is formed on the back surface 26p of the transparent base material 2. The background color is printed to form the first background color printing layer 4 (see FIGS. 4A and 4B). Even when the transparent base layer is provided on the back surface of the transparent base material 2, the same process as in the first modification can be applied.

After that, at least the back surface 26q of the transparent base material 2 corresponding to the second background color viewing range 22 is covered with the metal mask 12, and the area including the back surface 26r of the transparent base material 2 corresponding to the electromagnetic wave transmitting metal layer viewing range 23 is covered. The electromagnetic wave transmitting metal layer 5 is formed (see FIGS. 4 (c) and 4 (d)). In the illustrated example, the back surface 26q of the transparent base material 2 corresponding to the second background color viewing range 22 is covered with a metal mask, and the back surface 26r of the transparent base material 2 corresponding to the electromagnetic wave transmitting metal layer viewing range 23 and the metal mask 12 Then, the electromagnetic wave transmitting metal layer 5 is formed in the region corresponding to the first background color printing layer 5, and the metal mask 12 formed by laminating the electromagnetic wave transmitting metal layer 5 is removed.

In the process of forming the electromagnetic wave transmitting metal layer 5 and removing the metal mask, the back surface side of the first background color printing layer 4 is also formed in addition to the back surface 26q of the transparent base material 2 corresponding to the second background color viewing range 22. It is covered with a metal mask, and after the electromagnetic wave transmitting metal layer is laminated and formed on the metal mask, the metal mask is removed so that the electromagnetic wave transmitting metal layer 5 is not laminated and formed on the back surface of the first background color printing layer 4. In this case, the radome for an in-vehicle radar device has a structure in which the second background color coating layer 6 is laminated and fixed on the back surface of the first background color printing layer 4. Further, the step of forming the electromagnetic wave transmissive metal layer 5 can be performed by electroplating, vapor deposition, spattering, or the like, and the material of the electromagnetic wave transmissive metal layer 5 is the manufacturing step of FIG. It is possible to use the same as in the case of the example.

After that, the painting process (see FIG. 4E) and the mounting process of the support member 3 are performed in the same manner as in the manufacturing process example of FIG. 3, and the radome 1 for the in-vehicle radar device is completed.

According to the manufacturing process of the first modification, the electromagnetic wave transmitting metal layer 5 can be formed by thin film deposition, sputtering, electroless plating, or the like, and the degree of freedom in the manufacturing process can be increased. In addition, the corresponding effect can be obtained from the configuration corresponding to the manufacturing process example of FIG.

[Second modification of the manufacturing process of the radome for the in-vehicle radar device of the embodiment]
Next, a second modification of the manufacturing process of the radome 1 for an in-vehicle radar device according to the embodiment will be described. In the manufacturing process of the second modification, first, as in the printing process of FIG. 3, the transparent base material 2 on which the stepped back surface 26p, 26q, 26r is formed is used, and the first surface is on the back surface 26p of the transparent base material 2. The background color is printed to form the first background color printing layer 4 (see FIGS. 5A and 5B). Even when the transparent base layer is provided on the back surface of the transparent base material 2, the same process as in the second modification can be applied.

After that, the electromagnetic wave transmitting metal layer 5 is placed in a region including the back surface 26q of the transparent base material 2 corresponding to the second background color viewing range 22 and the back surface 26r of the transparent base material 2 corresponding to the electromagnetic wave transmitting metal layer viewing range 23. Form (see FIG. 3 (c)). In the illustrated example, the back surface 26q of the transparent base material 2 corresponding to the second background color viewing range 22 and the back surface 26r of the transparent base material 2 corresponding to the electromagnetic wave transmitting metal layer viewing range 23 are combined with the first background color printing. An electromagnetic wave transmitting metal layer 5 is also formed on the back surface of the layer 4. The step of forming the electromagnetic wave transmissive metal layer 5 can be performed by electroplating, vapor deposition, spattering, or the like, and the material of the electromagnetic wave transmissive metal layer 5 is an example of the manufacturing process shown in FIG. It is possible to use the same as in the case of.

Then, as shown in FIG. 3D, the electromagnetic wave transmitting metal layer 5 formed on the back surface 26q of the transparent base material 2 corresponding to the second background color viewing range 22 is removed by laser irradiation. For the removal of the electromagnetic wave transmitting metal layer 5 by this laser irradiation, for example, a laser beam having a beam diameter of 0.1 μm to 1000 μm is used, and a scanning speed of 1 mm / s to 10000 mm / s is used in the range of the back surface 26q. It is good to scan at high speed with and remove it.

After that, the painting process (see FIG. 5E) and the mounting process of the support member 3 are performed in the same manner as in the manufacturing process example of FIG. 3, and the radome 1 for the in-vehicle radar device is completed.

According to the manufacturing process of the second modification, it is possible to peel off the electromagnetic wave transmitting metal layer 5 into a free shape at high speed and with high accuracy by laser irradiation, and it is transparent corresponding to the second background color viewing range 22. The electromagnetic wave transmitting metal layer 5 formed on the back surface 26q of the base material 2 is surely removed, and the electromagnetic wave transmitting metal layer 5 or a part thereof is prevented from remaining in the second background color viewing range 22 by any chance. This makes it possible to ensure good visibility of the second background color coating layer 6 in the second background color viewing range 22. Further, the treatment for removing the electromagnetic wave transmitting metal layer 5 by laser irradiation can be performed at low cost, and the manufacturing cost can be further reduced. Further, the manufacturing process of the second modification can be performed without using a mask, and the manufacturing cost can be reduced from this point as well. Further, the electromagnetic wave transmitting metal layer 5 can be formed by vapor deposition, sputtering, electroless plating, or the like, and the degree of freedom in the manufacturing process can be increased. In addition, the corresponding effect can be obtained from the configuration corresponding to the manufacturing process example of FIG.

[Scope of inclusion of the invention disclosed in the present specification]
The invention disclosed in the present specification is specified by changing the partial contents thereof to other contents disclosed in the present specification to the extent applicable, in addition to the inventions and embodiments listed as inventions. Alternatively, those specified by adding other contents disclosed in the present specification to these contents, or those specified by deleting these partial contents to the extent that a partial action and effect can be obtained and making them into a higher concept. Include. The invention disclosed in the present specification also includes the following modifications and additional contents.

For example, in the present invention, the first background color printing layer 4 of the first background color viewing range 21 and the second background color coating layer 6 of the second background color viewing range 22 are transparent at positions adjacent to each other in the surface view. The depth positions of the base material 2 are substantially different, preferably different. The transparent metal layer 5 includes an appropriate configuration in which the depth positions of the transparent base materials 2 are substantially different from each other at positions adjacent to each other in the surface view, preferably different back surfaces 26q and 26r. Formed at locations where the depth positions of the first background color printing layer 4 of the first background color viewing range 21 and the second background color coating layer 6 of the second background color viewing range 22 are the same, except for the locations adjacent to each other. Or those formed at locations where the depth position of the second background color coating layer 6 in the second background color viewing range 22 and the electromagnetic wave transmitting metal layer 5 in the electromagnetic wave transmitting metal layer viewing range 23 are the same. Is also included.

Further, for example, the position of the back surface 26q of the transparent base material 2 corresponding to the second background color viewing range 22 in the depth direction rather than the position in the depth direction of the back surface 26p of the transparent base material 2 corresponding to the first background color viewing range 21. Is formed so as to be arranged on the front surface side, and is a transparent group corresponding to the electromagnetic wave transmitting metal layer viewing range 23 rather than the position in the depth direction of the back surface 26q of the transparent base material 2 corresponding to the second background color viewing range 22. The back surface 26r of the material 2 is formed so as to be arranged on the back surface side in the depth direction, and the transparent base material 2 has a first background color printing layer 4, an electromagnetic wave transmitting metal layer 5, and a second background color coating layer 6. Is also included (see FIG. 6 (a)).

Further, for example, the position of the back surface 26q of the transparent base material 2 corresponding to the second background color viewing range 22 in the depth direction rather than the position in the depth direction of the back surface 26p of the transparent base material 2 corresponding to the first background color viewing range 21. Is formed so as to be arranged on the back surface side, and is a transparent group corresponding to the electromagnetic wave transmitting metal layer viewing range 23 rather than the position in the depth direction of the back surface 26q of the transparent base material 2 corresponding to the second background color viewing range 22. The back surface 26r of the material 2 is formed so as to be arranged on the front surface side in the depth direction, and the transparent base material 2 has a first background color printing layer 4, an electromagnetic wave transmitting metal layer 5, and a second background color coating layer 6. Is also included (see FIG. 6 (b)).

Further, for example, the position of the back surface 26q of the transparent base material 2 corresponding to the second background color viewing range 22 in the depth direction rather than the position in the depth direction of the back surface 26p of the transparent base material 2 corresponding to the first background color viewing range 21. Is formed so as to be arranged on the back surface side, and is a transparent group corresponding to the electromagnetic wave transmitting metal layer viewing range 23 rather than the position in the depth direction of the back surface 26q of the transparent base material 2 corresponding to the second background color viewing range 22. The back surface 26r of the material 2 is formed so as to be arranged on the back surface side in the depth direction, and the transparent base material 2 has a first background color printing layer 4, an electromagnetic wave transmitting metal layer 5, and a second background color coating layer 6. Is also included (see FIG. 6 (c)).

Further, the radome for an in-vehicle radar device of the present invention includes a radome for an in-vehicle radar device having a plurality of different background colors, such as a radome having a first background color and a third background color other than the second background color.

Further, in the above embodiment, the second background color decoration layer constituting the second background color viewing range is the second background color coating layer 6 provided by painting, but the second background color decoration in the present invention is used. The layer includes an appropriate decorative layer capable of decorating a second background color different from the first background color, for example, a second background color vapor deposition layer or a second background color spatter layer. It is also possible to use it as a background color decorative layer. In this case, in the manufacturing process of the above embodiment and the first and second modifications, the second background color decorative layer is formed by vapor deposition treatment or spatter treatment instead of the painting step of forming the second background color coating layer 6. The decoration step of forming is performed, and at least the back side of the first background color printing layer 4 of the first background color viewing range 21 located around the second background color viewing range 22 and the second background color viewing range 22. A second background color decorative layer is also provided on the back surface side of the electromagnetic wave transmitting metal layer 5 in the electromagnetic wave transmitting metal layer viewing range 23 located in the vicinity.

The present invention can be used for a radome for an in-vehicle radar device.

1 ... Redome for in-vehicle radar device 2 ... Transparent base material 21 ... First background color viewing range 22 ... Second background color viewing range 23 ... Electromagnetic wave transmissive metal layer viewing range 25 ... Modified surface 26, 26p, 26q, 26r ... Back surface 27 ... Surface 3 ... Support member 31 ... Frame part 4 ... First background color printing layer 5 ... Electromagnetic wave transmissive metal layer 6 ... Second background color painting layer 7 ... Mark symbol part 11 ... Photo mask 12 ... Metal mask

Claims (7)

The first background color viewing range in which the first background color of the first background color printing layer is visually recognized from the surface side of the transparent substrate, and
A second background color viewing range in which a second background color different from the first background color of the second background color decorative layer is visually recognized from the surface side of the transparent substrate.
An electromagnetic wave transmitting metal layer viewing range is provided in which an electromagnetic wave transmitting metal layer having a different appearance from that of the first background color and the second background color can be visually recognized from the surface side of the transparent substrate.
At least, the electromagnetic wave transmitting metal located on the back surface side of the first background color printing layer of the first background color viewing range located around the second background color viewing range and around the second background color viewing range. The second background color decorative layer is also provided on the back surface side of the electromagnetic wave transmitting metal layer in the layer viewing range, and is also provided .
The depth position of the transparent substrate at a position where the first background color printing layer in the first background color viewing range and the second background color decorative layer in the second background color viewing range are adjacent to each other in the surface view. Is formed on a substantially different back surface,
The depth position of the transparent substrate at a position where the second background color decorative layer in the second background color viewing range and the electromagnetic wave transmitting metal layer in the electromagnetic wave transmitting metal layer viewing range are adjacent to each other in the surface view. A redome for an in-vehicle radar device, characterized in that it is formed on a substantially different back surface . The mark symbol portion is composed of the second background color decorative layer in the second background color viewing range and the electromagnetic wave transmitting metal layer in the electromagnetic wave transmitting metal layer viewing range, or the second background color viewing range. In addition to being composed of the second background color decorative layer,
The vehicle-mounted radar device according to claim 1 , wherein the second background color decorative layer is any one of a second background color coating layer, a second background color vapor deposition layer, and a second background color sputtering layer. Radome. The radome for an in-vehicle radar device according to claim 1 or 2 , wherein the transparent substrate is a transparent substrate made of synthetic resin, glass, or ceramic. The method for manufacturing a radome for an in-vehicle radar device according to any one of claims 1 to 3 .
At least, the first background color printing layer between the first background color printing layer and the electromagnetic wave transmitting metal layer on the back surface of the transparent substrate on which the first background color printing layer and the electromagnetic wave transmitting metal layer are formed. In addition to decorating the first region where the electromagnetic wave transmitting metal layer is not formed, the second region on the back surface side of the first background color printing layer located around the first region and the first region. The second background color decorative layer is formed by decorating the third region on the back surface side of the electromagnetic wave transmitting metal layer located in the vicinity of the first region with the decoration of the first region. A method for manufacturing a redome for an in-vehicle radar device, which comprises a decoration process. Before the decoration process,
The first step of printing the first background color on the back surface of the transparent substrate to form the first background color printing layer, and
At least, the back surface of the transparent substrate corresponding to the second background color viewing range in which the second background color different from the first background color is visually recognized from the surface side of the transparent substrate is covered with a photomask, and the above-mentioned The second step of forming a modified surface by light irradiation on the back surface of the transparent substrate corresponding to the electromagnetic wave transmitting metal layer visible range in which the electromagnetic wave transmitting metal layer is visually recognized from the surface side of the transparent substrate.
The method for manufacturing a radome for an in-vehicle radar device according to claim 4 , wherein the third step of forming the electromagnetic wave transmitting metal layer of the discontinuous metal layer on the modified surface by performing electroless plating treatment is performed. Before the decoration process,
The first step of printing the first background color on the back surface of the transparent substrate to form the first background color printing layer, and
At least, the back surface of the transparent substrate corresponding to the second background color viewing range in which the second background color different from the first background color is visually recognized from the surface side of the transparent substrate is covered with a metal mask, and the above-mentioned The second step of forming the electromagnetic wave transmitting metal layer in the region including the back surface of the transparent substrate corresponding to the electromagnetic wave transmitting metal layer visible range in which the electromagnetic wave transmitting metal layer is visually recognized from the surface side of the transparent substrate.
The method for manufacturing a radome for an in-vehicle radar device according to claim 4 , wherein the third step of removing the metal mask is performed. Before the decoration process,
The first step of printing the first background color on the back surface of the transparent substrate to form the first background color printing layer, and
From the back surface side of the transparent substrate corresponding to the second background color viewing range in which a second background color different from the first background color is visually recognized from the surface side of the transparent substrate, and from the front surface side of the transparent substrate. The second step of forming the electromagnetic wave transmitting metal layer in the region including the back surface of the transparent substrate corresponding to the electromagnetic wave transmitting metal layer visible range in which the electromagnetic wave transmitting metal layer is visually recognized, and the second step.
The vehicle-mounted radar device according to claim 4 , wherein the third step of removing the electromagnetic wave transmitting metal layer formed on the back surface of the transparent substrate corresponding to the second background color viewing range by laser irradiation is performed. How to make a radome.

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