Accession Number : ADD011023

Title :   High Illumination Flashbulb Array with Firing Sequence Control Means.

Descriptive Note : Patent,

Corporate Author : DEPARTMENT OF THE AIR FORCE WASHINGTON DC

Personal Author(s) : Kelly,R H

Report Date : 20 Mar 1984

Pagination or Media Count : 4

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.

Descriptors :   *Patents, *Firing circuits, *Photographic lighting systems, *Flash lamps, Control sequences, Delay, Shift registers, Silicon controlled rectifiers, Gates(Circuits), Timing circuits, Pulse trains, Diodes

Subject Categories : Air Condition, Heating, Lighting & Ventilating
      Photography

Distribution Statement : APPROVED FOR PUBLIC RELEASE