Last-flash indicator switch in photoflash array
AssigneeGeneral Electric Company
InventorNorman E. Kewley
Life of this patent
Estimating the term…
Abstract
A multiple lamp photoflash array of the FlipFlash type having flash-sequencing circuitry for causing the lamps to flash one at a time in response to firing pulses applied to the array. All lamp circuits except for the last-to-flash lamp provide an open circuit after lamp flashing, and the last-to-flash lamp provides a short circuit or low impedance after flashing to function as a last-flash indicator switch.
Claims6
A multiple flash array comprising a group of flash lamps of which one of the lamps is to be flashed last, said array being provided with a pair of connector terminals adapted to receive lamp-firing electrical signals for causing said lamps to flash, said flash lamps being respectively connected in lamp circuits which are electrically connected across said connector terminals, all of said lamp circuits except that of the last-to-flash lamp being adapted to have open circuits or high impedances after their lamps are flashed, and said lamp circuit of the last-to-flash lamp being adapted to have a short circuit or low impedance after the lamp is flashed.
Dependencies are inferred from the claim text.