Lens characterization apparatus and method

Details Lens characterization apparatus and method Lens characterization apparatus and method

1986-06-09

1988-08-30

Rosenberger, R. A.

Optics: measuring and testing

Lens or reflective image former testing

For optical transfer function

G01B 900

Patent

active

047672153

ABSTRACT:
A beam of light, such as a laser, is used to scan across a lens. The beam passing through the lens is modulated by an optical encoder which controls the amount of the beam passing through the encoder to a light receptor. The received light is quantified and processed to determine any distortion caused by the lens. The encoder is comprised of a set of transparent windows upon an opaque face, the windows having a certain pattern that a beam travelling across the windows casts a specific light intensity pattern. The encoder also allows determination of astigmatism of the lens and distortion inherent in the beam itself.

REFERENCES:
patent: 4203666 (1980-05-01), Ili et al.
patent: 4272190 (1981-06-01), Shapiro
patent: 4641964 (1987-02-01), Mitani et al.
patent: 4654525 (1987-03-01), Ebina et al.

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