Patent ID: 6565250
Filing Date: 2003-05-20
Classification: F21V,F21W

Abstract:
A method of designing a reflective surface of a reflector used in a vehicle lamp, which comprises:a first base curve generating step of generating a first base curve on a first base plane including an optical axis passing a light source position where a light source is placed and becoming a direction into which light from said light source is reflected by the reflector, and a first base axis perpendicular to said optical axis; a second base curve generating step of, at each of a plurality of predetermined points existing on said first base curve, generating a second base curve extending in a direction of a second base axis perpendicular to said first base plane, on a second base plane including said predetermined point and being parallel to a direction of reflection of the light from said light source at said predetermined point and normal to said first base plane; and a surface shape generating step of generating a surface shape of said reflective surface, based on said first base curve and said plurality of second base curves.