Patent ID: 7286211

Claim:
A method for measuring fundamental data of a lens, comprising the steps of: illuminating a first measurement point of the lens with a first light at a first predetermined angle of incidence from a first surface side of the lens, measuring a first degree of refraction of the first transmitted light that passes through the lens from a second surface side of the lens; illuminating the first measurement point with a second light at a second predetermined angle of incidence from the first surface side of the lens; measuring a second degree of refraction of the second transmitted light that passes through the lens from the second surface side of the lens; illuminating the first measurement point with a third light at a third predetermined angle of incidence from the first surface side of the lens; measuring a third degree of refraction of the third transmitted light that passes through the lens from the second surface side of the lens; illuminating a second measurement point with a fourth light at a fourth predetermined angle of incidence from the second surface side of the lens; measuring a fourth degree of refraction of the fourth transmitted light that passes through the lens from the first surface side of the lens; illuminating the second measurement point with a fifth light at a fifth predetermined angle of incidence from the second surface side of the lens; measuring a fifth degree of refraction of the fifth transmitted light that passes through the lens from the first surface side of the lens; illuminating the second measurement point with a sixth light at a sixth predetermined angle of incidence from the second surface side of the lens; measuring a sixth degree of refraction of the sixth transmitted light that passes through the lens from the first surface side of the lens; calculating a thickness of the lens, a focal distance of the first side surface of the lens, a focal distance of the second side surface of the lens, a focal distance of the lens, a curvature of radius of the first side surface of the lens, a curvature of radius of the second side surface of the lens and a refractive index of the lens based upon first, second, third, fourth, fifth and sixth “angle of incidence—degree of refraction” relationships; and outputting at least one of the calculated thickness of the lens, focal distance of the first side surface of the lens, focal distance of the second side surface of the lens, focal distance of the lens, curvature of radius of the first side surface, curvature of radius of the second side surface, and a refractive index of the lens.