High illumination flashbulb array with firing sequence control m

Details High illumination flashbulb array with firing sequence control m High illumination flashbulb array with firing sequence control m

1981-12-21

1984-03-20

Adams, Russell E.

354148, G03B 1503

Patent

active

044377487

ABSTRACT:
Sequential firing of strings of flashbulbs arranged in a parallel array is controlled by a shift register that functions in response to an IC 555 timer. The timer delivers a pulse train (the PRF of which can be set for appropriate firing intervals) that drives the shift register which in turn provides firing signals sequentially from each stage. The firing signals are applied to the gates of silicon controlled rectifiers that are located in each flashbulb string. Firing due to spurious signals is prevented by diodes that short each silicon controlled rectifier gate to ground through a normally closed relay contact. During the arm and fire operational sequence the relay contact opens removing the ground from the silicon controlled rectifiers and enabline their operation.

REFERENCES:
patent: 3676045 (1972-07-01), Watrous et al.
patent: 3699861 (1972-10-01), Burgarella et al.
patent: 3714508 (1973-01-01), Harnden et al.
patent: 3728947 (1973-04-01), Harnden et al.
patent: 3860856 (1975-01-01), Watrous
patent: 3994664 (1976-11-01), Casano

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