Patent ID: 8613238

Claim:
A control knob for a vehicle formed by dual injection molding of two different materials and installed on one end of a shift lever to function as a handgrip, the control knob comprising: an opaque portion formed of an opaque material which is one of the two materials; a transparent portion formed of a transparent material which is another of the two materials; an overlapping portion integrally formed by dual injection molding with the two different materials, at which the opaque portion is disposed underneath the transparent portion so that the transparent portion covers the opaque portion; and a coated portion formed of paint applied to portions of the transparent portion that do not overlap with the opaque portion; wherein a boundary surface between the opaque portion and the transparent portion is formed in a slope such that a refractive index of light passing through the transparent portion from the overlapping portion is close to a refractive index of light passing through the transparent portion from the coated portion, and a thickness of the covering transparent portion measured perpendicularly from the opaque portion at the overlapping portion changes gradually along the boundary surface.