METHOD FOR MEASURING DECENTRALIZATION OF OPTICAL AXIS ON THE FRONT AND THE REAR SURFACE OF LENS

摘要

A laser probe is used to measure a cross sectional shape in a first and a second direction at each of apexes at the front and the rear surface of an aspheric lens. The measured cross sectional shape of the front and the rear surface of the aspheric lens is described in a common coordinate system decided according to the 3D position of the measured pin hole (common reference point). According to the measured cross sectional shape, each of the apexes is detected so as to obtain the relative decentralization amount of the front and the rear surface of the aspheric lens with accuracy in the order of micrometers or below.