Patent · US Expired

Switching circuit for regulation of camera functions

US4354747A · kind A · utility

4Cited by

2References

26Claims

0Family size

Assignee

Agfa-Gevaert NV · BE

Inventors

Kurt Borowski · Aschheim, DE
Reinhard Nicko · Munich, DE
Istvan Cocron · Munich, DE
Dieter Engelsmann · Unterhaching, DE

Key dates

Filing date	Mar 9, 1981
Grant date	Oct 19, 1982
Priority date	—
Expiry date	Mar 9, 2001

Classification

Technology area (CPC G)Physics
CPC primaryG03B7/097
WIPO fieldBasic communication processes
WIPO sectorElectrical engineering

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.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.