Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1985-08-05
1989-02-21
Westin, Edward P.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
250225, 250226, 356369, 356384, 358107, G01B 1100, G01B 1102
Patent
active
048067768
ABSTRACT:
A light transmission unit, such as a liquid crystal cell, operated by an electronic control circuit is interposed in the illumination system of a viewing system for providing a plurality of selectable illumination or viewing conditions, such as transmissive illumination, incident illumination, oblique illuminations, differentially shaded illumination, dark field illumination, bright field illumination, phase contrast illumination, differential polarization illumination, and/or color illumination.
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