Data imprinting lamp control circuit

Details Data imprinting lamp control circuit Data imprinting lamp control circuit

1978-12-21

1980-11-25

Hix, L. T.

354289, G03B 1724, G03B 1718

Patent

active

042355443

ABSTRACT:
A lamp control circuit for energizing a data imprinting lamp in response to an actuation of a flash trigger switch in a camera, for a given period so that data images illuminated by the lamp are imprinted on a film with a suitable exposure. The control circuit includes a series connection of a SCR element and a capacitor, a trigger circuit for applying a single pulse to the control terminal of the SCR element, a capacitor discharge circuit for discharging with a given time constant the capacitor that has been charged through the SCR element, and a switching circuit for energizing the lamp while the terminal voltage of the capacitor is above a threshold level. The trigger circuit has a high input impedance to protect the control circuit from high voltage which otherwise may be applied thereto through a camera synchro terminal to which the input terminal of the trigger circuit is connectable.

REFERENCES:
patent: 3812508 (1974-05-01), Matsuda et al.
patent: 3889281 (1975-06-01), Taguchi et al.
patent: 3906523 (1975-09-01), Ogiso et al.
patent: 3971049 (1976-07-01), Ohmori et al.
patent: 4025931 (1977-05-01), Taguchi et al.
patent: 4112444 (1978-09-01), Yonemoto et al.

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