Patent ID: 6611376
Filing Date: 2003-08-26
Classification: G02B,G03F,Y10S

Abstract:
A method of manufacturing a diffractive optical element, which is turned by a turntable and has a light-bending function, said method comprising:a first step of forming a diffraction grating of the diffractive optical element; a second step of detecting the state of light transmitted from a light source through the diffractive optical element while turning the diffractive optical element about a turn axis of the turntable; a third step of adjusting relative positions of an optical axis of the diffractive optical element and the turn axis to minimize a detected amount of shift of the light detected by said second step; and a fourth step of cutting an outer periphery of the diffractive optical element, so that the optical axis of the diffractive optical element aligns with a center of a profile of the diffractive optical element.