Lens meter

Details Lens meter Lens meter

1986-06-05

1989-05-02

Rosenberger, Richard A.

Optics: measuring and testing

Lens or reflective image former testing

Focal length measuring

G01B 900

Patent

active

048263150

ABSTRACT:
A lens meter has a single point-like light source, a collimator lens for collimating the light from the point-like light source and causes it to enter a lens to be examined, a plural-aperature stop disposed immediately reawardly of the lens to be examined and having three or more apertures, a light-receiving optical system including a prism assembly for separating the light beams from the plural-aperture stop on the light-receiving surface thereof, and an array light-receiving element disposed at the focus position of the light-receiving optical system for measuring the refractive value of the lens to be examined by the mutual positional relation between the received light beams.

REFERENCES:
patent: 3880525 (1975-04-01), Johnson
patent: 4275964 (1981-06-01), Vassiliadis
patent: 4641961 (1957-02-01), Yamada

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