Automatic lens meter

Details Automatic lens meter Automatic lens meter

1991-10-04

1993-07-27

Rosenberger, Richard A.

Optics: measuring and testing

Lens or reflective image former testing

Focal length measuring

356127, G01B 900

Patent

active

052314600

ABSTRACT:
An automatic lens meter includes a projection optical system for projecting light beams onto a lens to be tested. The lens is held at a predetermined position in the direction of an optical axis. The meter also includes a receiving optical system having a light position detector. The receiving optical system receives light beams transmitted through the lens to be tested on the light-position detector. The meter further includes a calculator for calculating a diopter value and an eccentricity of the lens to be tested from the position of the tranmitted light beams on the light-position detector, a timer for measuring the time during which the eccentricity is within a predetermined range, and a display device for displaying the diopter value of the lens to be tested when the time during which the eccentricity is within a predetermined range exceeds a predetermined time.

REFERENCES:
patent: 4534645 (1985-08-01), Nohda
patent: 4609287 (1986-09-01), Kohayakawa
patent: 4730924 (1988-03-01), Allard et al.
patent: 4779979 (1988-10-01), Iwane
patent: 4826315 (1989-05-01), Kohayakawa

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