Last-flash indicator for photoflash array
AssigneeGeneral Electric Company
InventorPaul T. Cote
Life of this patent
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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. A radiation switch associated with the last lamp to be flashed causes a short circuit across the array's electrical terminals when the last lamp is flashed and actuates a last-flash indicator in the camera.
Claims10
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 input signal connector terminals adapted to receive lamp-firing electrical signals for causing said lamps to flash, wherein the improvement comprises last-flash indicator switch means connected electrically between said pair of terminals and having an initial value of impedance and adapted to change to a different value of impedance in response to the flashing of said last-to-flash lamp thereby changing the impedance across said input signal connector terminals to indicate that said last-to-flash lamp has flashed.
Dependencies are inferred from the claim text.