Defocused unicell photometer with aspheric zone

Details Defocused unicell photometer with aspheric zone Defocused unicell photometer with aspheric zone

1977-01-31

1978-08-08

Corbin, John K.

Optics: measuring and testing

Photometers

Photoelectric

250237R, G01J 142, H01J 314

Patent

active

041053001

ABSTRACT:
A defocused unicell photometer of the type having a positive lens element is provided with at least one aspheric zone on a portion of the lens element surface to change the directional response characteristic of the photometer in a select manner without increasing the extreme field of view of the photometer.

REFERENCES:
patent: 3880528 (1975-04-01), Petersen
patent: 4040751 (1977-08-01), Baker et al.
patent: 4055761 (1977-10-01), Shimonura

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