Method of and systems for measuring eccentricity of an aspherica

Details Method of and systems for measuring eccentricity of an aspherica Method of and systems for measuring eccentricity of an aspherica

1996-07-29

1998-12-01

Font, Frank G.

Optics: measuring and testing

Lens or reflective image former testing

For optical transfer function

356127, G01B 900

Patent

active

058446702

ABSTRACT:
Accurate yet cost-effective measurement methods and systems determine eccentricity at a particular location of the aspherical lens surface. Since an aspherical lens generally has varying degrees of curvature along the aspherical surface, the eccentricity at the selected location on the aspherical lens surface provides precise information in determining the quality of a certain type of an aspherical lens component. Furthermore, these improved methods and systems according to the current invention are applicable to measure eccentricity of a selected aspherical lens surface in a complex lens assembly containing a plurality of aspherical lens components.

REFERENCES:
patent: 4767215 (1988-08-01), Borodovsky
patent: 4779979 (1988-10-01), Iwane
patent: 4818108 (1989-04-01), Eppinger
patent: 5231460 (1993-07-01), Kohayakawa
patent: 5349433 (1994-09-01), Iwane
patent: 5548396 (1996-08-01), Morita et al.
Article entitled "Theory and Practice of Lens Engineering" in Optical Technology Contact, vol. 20, No. 5 (1982) (In Japanese).

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