Apparatus and method for measuring eccentricity of...

Details Apparatus and method for measuring eccentricity of... Apparatus and method for measuring eccentricity of...

2007-10-23

2007-10-23

Toatley, Jr., Gregory J. (Department: 2877)

Optics: measuring and testing

Lens or reflective image former testing

Optical center, cylinder axis, or prism measuring or...

C356S124000

Reexamination Certificate

active

10979165

ABSTRACT:
An apparatus for measuring the eccentricity of the aspherical surface has a light source unit; a condenser lens condensing light rays in the proximity of the center of paraxial curvature of a surface to be examined, of an aspherical lens; an angle changing means for entering the rays on the surface to be examined, at angles θ1i (i=1, 2, . . . , N) with an optical axis; a holding tool of the aspherical lens; a light-splitting element; an imaging lens; a light-detecting element detecting the situation of light collected by the imaging lens; and an arithmetical unit. The arithmetical unit is such as to calculate the amount of eccentricity of the surface to be examined, from amounts of shift ΔP1i (i=1, 2, . . . , N) between spot positions P1i (i=1, 2, . . . , N) based on the design data of the surface to be examined and spot positions P1mi (i=1, 2, . . . , N) derived from the light-detecting element, with respect to light rays Q1i (i=1, 2, . . . , N) produced by the angle changing means.

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