Exposure time control circuit

Details Exposure time control circuit Exposure time control circuit

1974-12-17

1976-06-08

Hix, L. T.

354 53, 354 60R, 354 60E, G03B 708, G03B 1718

Patent

active

039627098

ABSTRACT:
An exposure time control circuit for a camera shutter having a light-responsive element that controls charging of a capacitor as a function of the intensity of the light from a scene to be photographed. The charge of the capacitor at a certain level activates a switching circuit that initiates closing of the camera shutter. A light-intensity indicating circuit is directly connected to the light-responsive element for indicating the intensity of the light received from a scene to be photographed so that the camera shutter speed may be set accordingly. Photographic exposure and light readings are taken independently with control switches that need not make use of a change-over switch for connecting and disconnecting the light-intensity indicating circuit to the light-responsive element.

REFERENCES:
patent: 3324779 (1967-06-01), Nobusawa et al.
patent: 3418477 (1968-12-01), Schmitt
patent: 3616731 (1971-11-01), Rentschler
patent: 3675548 (1972-07-01), Kikuchi et al.
patent: 3750540 (1973-08-01), Yanagisawa et al.

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