Image Number 5 for United States Patent #6272965.
An electro-explosive device ("EED") having resistors fabricated on a thermally conductive substrate and interconnected by a central bridge element. The resistance of the bridge element is lower than that of the resistors, which have a larger surface area to volume ratio. A layer of zirconium is placed on the bridge element and explodes into a plasma along with the bridge element in order to ignite a pyrotechnic compound. The substrate using integrated circuit fabrication techniques and the conductive bridge of the EED is overcoated with a composite overcoat comprising a metal and an oxidizer, which produces a chemical explosion upon plasma vaporization of the conductive bridge.