Lensmeter

Details Lensmeter Lensmeter

1977-11-01

1980-05-20

Corbin, John K.

Optics: measuring and testing

Lens or reflective image former testing

For optical transfer function

356125, G01B 900

Patent

active

042036666

ABSTRACT:
An improved lensmeter comprising a conventional optical system and a novel displaying system. The displaying system includes a linear encoder producing two sets of pulse signals equivalent to the distance and direction of linear movement of the target and circuitry for converting the two sets of pulse signals to a dioptral number of digits, and displaying it. The dioptral number has a plus or minus sign and precision of 0.125 or 0.06 diopters. The displaying system also includes two circuits for displaying at the same time "the power of the sphere" (S) and "the power of the cylinder" (C) of an astigmatic lens respectively as a dioptral number of digits, a rotary encoder and circuitry for displaying "the direction of axis of the cylinder" (Ax) as an angular degree of digits, a (C) sign transposing circuit, and a cylinder form transposing circuit.

REFERENCES:
patent: 3360660 (1967-12-01), Kusch et al.
patent: 3378677 (1968-04-01), Waldecker et al.
patent: 3723748 (1973-05-01), Coburn et al.
patent: 3749925 (1973-07-01), Hertrich
patent: 3832066 (1974-08-01), Cornsweet
patent: 4123163 (1978-10-01), Chace et al.

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