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

1975-10-16

1977-05-31

Hartary, Joseph W.

354 51, 354 60L, G03B 708

Patent

active

040273148

ABSTRACT:
Voltage comparators for actuating a camera shutter and a low-light indicating lamp respectively have inputs connected to junctions between photocells and resistors so as to be controlled in response to the light level. The voltage comparator for the low-light indicator energizes the indicator 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 through a diode to the input of the voltage comparator for the low-light indicator so that the low light indicator is deenergized when the shutter is closed.

REFERENCES:
patent: 3709113 (1973-01-01), Wood
patent: 3860936 (1975-01-01), Harvey

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