Photoflash unit with formed insulating sheet

A photoflash unit comprising a printed circuit board having circuitry on a surface thereof, a plurality of flashlamps positioned over said surface and having lead-in wires connected to said circuitry, said circuitry being provided for sequentially igniting said flashlamps, a plurality of conductive reflectors respectively associated with said flashlamps and positioned between said lamps and said circuit board, at least one of said reflectors having an aperture therein, a radiant-energy-activated disconnect switch attached to said circuit board in alignment with said aperture in the reflector, said disconnect switch being electrically connected to said circuitry in series with a respective one of said flashlamps for interrupting the ignition circuit for said flashlamp after said flashlamp is ignited, said disconnect switch comprising a conductive strip of heat-separable material attached at both ends to said circuit board with the midportion of said strip being spatially suspended to avoid contact with said circuit board, said strip midportion being positioned so as to be in operative relationship with the radiant output from a respective ignited flashlamp via said aperture in the reflector, a sheet of electrically insulating material interposed between said reflectors and said circuit board, and a deformation provided in said sheet of insulating material for spacing said sheet from the midportion of said strip to avoid contact therewith.