Photoflash unit with secured insulator

摘要

A compact photoflash unit comprising a plurality of flashlamps having lead-in wires connected to a circuit board containing thereon radiation-sensitive switching circuitry for sequentially flashing the lamps. Electrically conductive reflector panels are positioned between the lamps and the circuit board, and a sheet of electrically insulating material is interposed between the reflectors and the circuit board to prevent shorting of the circuitry on the circuit board by the conductive reflector. The insulating sheet, which may be of transparent plastic, is provided with T-shaped tabs which interlock with slots in the circuit board to secure the aligned position of the insulating sheet thereon. In assembling the photoflash unit, the insulating sheet is placed on the circuit board prior to mounting the lamps, and the T-shaped tabs of the sheet are inserted in the circuit board slots to secure the aligned location of holes in the insulating sheet with lamp-mounting eyelets in the circuit board.