Data exposure device for camera

Details Data exposure device for camera Data exposure device for camera

1975-04-01

1977-12-06

Adams, Russell E.

354 32, 354 33, 354 35, 354 60F, 354145, G03D 1502

Patent

active

040620271

ABSTRACT:
An improved data exposure device for a camera is provided with a flash starting voltage detecting circuit for generating a signal indicating that the voltage across a flash capacitor rises a predetermined level sufficient to turn on a flash lamp to emit a suitable amount of light on exposure surface upon which data is recorded, a trigger circuit including a trigger capacitor for triggering said flash capacitor and a switching element actuatable for discharging said trigger capacitor, and a synchro circuit including a synchro switch closed when a shutter is released for actuating said switching element when said signal is generated while said synchro switch is closed. An improvement is that said synchro circuit is prevented from actuating said switching element when said synchro switch is closed under the condition that the voltage across said flash capacitor is less than a predetermined level sufficient to cause said flash lamp to start to flash.

REFERENCES:
patent: 3688664 (1972-09-01), Mashimo
patent: 3710701 (1973-01-01), Takishima et al.
patent: 3714872 (1973-02-01), Mashimo et al.
patent: 3971049 (1976-07-01), Ohmori et al.

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