PHOTOFLASH LAMP ARRAY CIRCUIT BOARD HAVING RADIATION SENSITIVE FUSE ELEMENTS

摘要

Fuse elements are used with a circuit board to provide more reliable sequential firing in a flash lamp array. The circuit board includes the lamp firing circuitry along with radiation switches connected in said circuitry and the fuse elements cooperate with said radiation switches in the circuit operation. Fuse elements are deposited on the circuit t pattern adjacent to the flash lamps for actuation by radiation being emitted therefrom and the activated fuse element interrupt the circuit path by thermal action. In a preferred embodiment, the circuit board is constructed from an organic polymer and the fuse elements are deposited at circuit locations wherein the underlying substrate has a thick less than the substrate thickness elsewhere to produce holes in the circuit board by melting or thermal decomposition