Iris or shutter arrangements

Details Iris or shutter arrangements Iris or shutter arrangements

1986-05-28

1988-09-27

Gellner, Michael L.

3542711, G03B 904

Patent

active

047745371

ABSTRACT:
An iris and shutter arrangement for a camera, particularly a CCD camera, in which a first liquid crystal display is formed of a plurality of concentric annuli of liquid crystal material and a second liquid crystal display is provided as a further plurality of coaxial annuli each of which overlies the space separating one annuli from the next in the first display. The first display also includes a relatively clear central circular area, defining the smallest aperture desired, which is covered by a circular area of liquid crystal material in the second display. The annuli in both cases are continuous save for breaks along a line forming a path for control conductors deposited upon the faceplates of the two displays.

REFERENCES:
patent: 3986022 (1976-10-01), Hyatt
patent: 4313663 (1982-02-01), Stemme et al.
patent: 4478502 (1984-10-01), Nakai
Patent Abstracts of Japan, vol. 8, No. 65, p. 263, Mar. 27, 1984; Mitsumasa Moriya.

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