SEQUENTIAL FLASHING OF MULTIPLE FLASH LAMPS BY LOW COST STATIC CONTROL CIRCUIT OF INTEGRATED DESIGN

摘要

Electronic circuitry for sequentially firing photoflash lamps of an array of multiple flash lamps. The circuitry comprises means for causing capacitors to be charged, at different rates of charging, upon the occurrence of a start-flash signal. These capacitors are respectively associated, by means of solid state switching devices, with certain flashlamps of the array, and the unfired flashlamp associated with the charging capacitor which first reaches a predetermined voltage, will be the first to fire. Alternatively, the first lamp to be fired need not be associated with a capacitor. Upon a lamp firing, disenabling circuitry causes discontinuing of charging of the capacitors until occurrence of the next start-flash signal, whereupon the capacitors repeat or resume their charging until the unfired flashlamp becomes fired which is associated with the next charging capacitor to reach the predetermined firing voltage. The procedure is repeated for causing sequential firing of all flashlamps in the array. Circuit modifications and alternative embodiments disclosed, including a single-capacitor circuit.