Lamp for a vehicle and method of making the same

Abstract

A lamp for vehicle that includes a light source, a housing, a reflector and a lens is disclosed. The lens is made by the process that includes the steps of (a) assuming an imaginary plane with a cross hatching pattern made of crossing groups of plural lines disposed in parallel at a constant pitch, (b) deforming the imaginary plane by a desired shape consisting of a convex surface, a concave surface or a combination of both surfaces, so that the cross hatching pattern is deformed into a process surface, and (c) processing a lens cut in accordance with the cross hatching pattern when the process surface is orthographically projected onto the lens surface. The deformation given to the imaginary plane is performed so that the maximum pitch of the cross hatching pattern orthographically projected onto the lens surface is 1.5 times or more and 20 times or less the minimum pitch. The lens cut may have curvatures of the same diffusion coefficient regardless of the pitch of the cross hatching pattern. Alternatively, the lens cut may have a curvature whose diffusion coefficient becomes greater when the pitch of the cross hatching pattern becomes greater. A convex or concave rib can be formed as a discontinuous portion in at least a part of the substantial boundary between the process surface in which the cross hatching pattern of the lens surface is deformed and the process surface in which the cross hatching pattern is not is deformed.