Optical conversion method

Details Optical conversion method Optical conversion method

1976-01-21

1978-01-03

Murray, Richard

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 41, 358225, 350159, H04N 904

Patent

active

040670430

ABSTRACT:
Disclosed is a method for converting an optical system, employing an electrooptic device in conjunction with a pair of crossed polarizing devices, between an activated mode and a deactivated mode. Embodiments in which the optical system is used as a neutral density filter, a selective color filter, or a light shutter, as applied to a television camera are described in which the electrooptic device and the polarizing analyzer are fixed with respect to the television camera, and the first polarizing device is selectively positioned in, or removed from, the optical path of the optical system to activate or deactivate the optical system, respectively. Where the optical system is used as a selective color filter to produce light beams of alternating colors in a field sequential color television system, deactivation of the optical system renders the television a black-and-white system.

REFERENCES:
patent: 2586635 (1952-02-01), Fernsler
patent: 2901539 (1959-08-01), Morgan

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