Liquid crystal indicator in camera finder

Details Liquid crystal indicator in camera finder Liquid crystal indicator in camera finder

1980-02-13

1981-11-24

Hix, L. T.

Optics: motion pictures

Removable film strip magazine type

354289, 354 60E, 354 72, 352171, 350336, 340765, G03B 1720

Patent

active

043020860

ABSTRACT:
A liquid crystal cell of elongated shape adapted to be arranged at one side of the field of view of the camera finder has a plurality of opposing of transparent electrodes on opposite sides of a liquid crystal layer which are aligned to each other in a matrix form, whereby the necessary number of leads is reduced. In order for the liquid crystal layer to present an indication in a selected area, or areas, an alternating voltage is applied across the correspondingly aligned electrodes, while still preventing the above-identified alternating voltage to appear at two or more electrodes in one set simultaneously even when light is blocked in the two separated areas of the liquid crystal layer. In other words, the number of those of the plurality of electrodes in set to which the alternating voltage is applied at a time depending upon the exposure value is limited always to only one even when two separated areas are selected for light shuttering at a time. Thus, the exposure values or shutter times can be indicated in half-steps increments.

REFERENCES:
patent: 3727527 (1973-04-01), Borowski
patent: 4050064 (1977-09-01), Hashimoto et al.

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