Patent
1975-01-15
1976-08-31
Hix, L. T.
354 53, G03B 700
Patent
active
039784991
ABSTRACT:
A warning light display device for an electric shutter of a camera having an exposure time control circuit for determining the exposure time of an electric shutter in dependence upon at least the brightness of an object being photographed. A warning display circuit is connected with the exposure time control circuit and has a control transistor that receives the output of the exposure time control circuit and controls the visual indication of three stages of the warning display circuit comprising light emitting diodes that indicate adequate and inadequate exposure conditions. A reference time generating circuit is provided in the warning display circuit for developing a signal representative of a predetermined time duration and a control transistor thereof controls energization of the three stages as a function of a comparison of the exposure time duration developed by the exposure time control circuit and the predetermined time duration developed by the reference time generating circuit.
REFERENCES:
patent: 3581634 (1971-06-01), Ort
patent: 3648053 (1972-03-01), Sato
patent: 3782254 (1974-01-01), Matsuzaki et al.
patent: 3792648 (1974-02-01), Ishiguro
Kato Shogo
Nagaoka Shinji
Nakamura Yukio
Adams Bruce L.
Burns Robert E.
Hix L. T,.
LaBarre James
Lobato Emmanuel J.
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