Shutter and low-light indicator actuating device for a camera

Details Shutter and low-light indicator actuating device for a camera Shutter and low-light indicator actuating device for a camera

1977-01-21

1978-09-05

Gellner, Michael L.

354 51, 354 60L, G03B 708

Patent

active

041124430

ABSTRACT:
Voltage comparators for actuating a camera shutter and a low-light indicating lamp respectively have inputs connected to junctions of photocells and resistors so as to be controlled in response to sensed light level. The voltage comparator for the low-light indicator energizes the indicator lamp when the light level is below a low-light value from the time the shutter release button is partially depressed until the time the shutter is closed after the exposure. The voltage comparator for the shutter produces a shutter opening signal to open the shutter for the required length of time based on the light level. The output of the voltage comparator for the shutter is connected to a stroke input of the voltage comparator for the low-light indicator so that the low light indicator is de-energized when the shutter is closed.

REFERENCES:
patent: 3664245 (1972-05-01), Bresson et al.
patent: 4027314 (1977-05-01), Iguchi et al.

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