Variable background intensity apparatus for imaging systems

Details Variable background intensity apparatus for imaging systems Variable background intensity apparatus for imaging systems

1975-03-25

1977-12-13

Clark, Conrad J.

350162SF, G02B 2114

Patent

active

040626199

ABSTRACT:
A variable background intensity control system employs a modulator plate having different density or transmittance regions located thereon. The modulator contains an area upon which an aperture slit or image is normally registered. By varying the position of this image on the plate, one can achieve a change in background intensity.
Other embodiments show the use of additional aperture images registering on other regions of the modulator to achieve background or contrast variations.

REFERENCES:
patent: 2427689 (1947-09-01), Osterberg et al.
patent: 2732759 (1956-01-01), Osterberg
patent: 2950648 (1960-08-01), Rhodes, Jr.

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