Patent ID: 8287990

Claim:
A radio wave transmission cover for providing in front of a radar device for vehicles, comprising: a design layer, the design layer having a front surface and a rear surface opposite to the front surface; a cover layer that covers the front surface of the design layer, the cover layer having a plate shape and having a rear surface facing the design layer and a front surface opposite to the rear surface; and a substrate layer that covers the rear surface of the design layer, the substrate layer having a plate shape, wherein the cover layer comprises a first cover layer that includes a transparent resin material, and a second cover layer for covering a portion of the first cover layer, the second cover layer being made of a mixture of the transparent resin material and a colorant, the second cover layer having a rear surface facing the design layer and a front surface opposite to the rear surface; wherein the design layer is formed on the rear surface of the cover layer by vapor-depositing metal, the design layer being positioned between the cover layer and the substrate layer; wherein the second cover layer comprises a plurality of engaging projection parts each of which has a plurality of cover-side wall surfaces extending in a frontward to a rearward direction; wherein the substrate layer is made of a resin material having a melting point different from the melting point of the transparent resin material, and comprises a plurality of engaging depression parts, each of which has a plurality of substrate-side wall surfaces having shapes complementary to the shapes of the plurality of cover-side wall surfaces; wherein the plurality of engaging projection parts are engaged to the plurality of engaging depression parts; wherein each of the plurality of cover-side wall surfaces engages with each of the plurality of substrate-side wall surfaces at the plurality of engaging depression parts.