Switching circuit for regulation of camera functions

Details Switching circuit for regulation of camera functions Switching circuit for regulation of camera functions

1981-03-09

1982-10-19

Hix, L. T.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

354 50, 354 60R, 354 60A, 354173, 354234, 307132E, 307132M, 307140, 307143, G03B 118, G03B 726, H01H 4700

Patent

active

043547478

ABSTRACT:
A digital circuit is described for controlling functions of a camera wherein the circuit is powered by a potential source which is connected to the circuit through a relay actuated switch. The circuit employs a plurality of D-flip flops to regulate functions such as film transport and opening and closing of the camera shutter as a function of the light intensity of the scene being photographed. A reset signal generator is used to provide stable and reliable control over the starting condition of the flip flops and render the circuit insensitive to voltage transients as may occur from contact bounce effects at the relay actuated switch. The reset signal generator employs an inverter delay chain to provide like reset pulses when such contact bounce occurs. Various control features are described.

REFERENCES:
patent: 3810228 (1974-05-01), Taguchi et al.
patent: 4200375 (1980-04-01), Ishiguro et al.

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