Time-delay means for rechargeable stroboscopic flash attachment

Claim 1

A rechargeable stroboscopic flash attachment on a camera having a flash cube operating circuit and a flash-cube-receiving receptacle provided with a pair of electrical contacts connected to said flash cube operating circuit and having a shutter control mechanism and a flash cube indexing mechanism, comprising a housing having a rechargeable stroboscopic flash unit therein, means fixedly securing said housing to said camera and including a fitting at least partially disposed in said housing and being rotatably mounted thereon, said fitting extending into said receptacle for actuating said shutter control mechanism, contact means secured to said housing engaging said pair of electrical contacts, time-delay operating means in said housing electrically connected to said contact means for time delaying a signal from said flash cube operating circuit, said rechargeable stroboscopic flash unit being operatively electrically connected to said timedelay operating means so that said time-delay operating means effectively delays actuation of said flash unit, said time-delay operating means comprising a resistance capacitance circuit, including first and second connector legs, a first resistor and a capacitor connected in series along said first connector leg, a second resistor shunted across the terminals of said capacitor, and a third resistor connected to one of the terminals of said capacitor and the second connector through a silicon control rectifier, said silicon control rectifier connecting said second connector leg to the other terminal of said capacitor for providing a time-delay in the operation of said rechargeable stroboscoPic flash unit.