Electropyrotechnical igniter with thin film ignition bridge and low energy requirement

摘要

The two electrodes of the initiator device are interconnected by two conductive metal layers in the surface of an insulator, with a resistor heating element between the two layers. An electropyrotechnic device comprises : (i) a container with a brittle wall and sealed by a body mass of height h which has an upper plane surface at the interior of the container and is electrically insulating ; (ii) two electrodes in the form of a fork which traverse the solid body ; and (iii) an electric circuit comprising thin layer deposits on a non-conductive support fixed to the upper face. The circuit is connected to the electrodes and comprises a thin layer resistive heating element, and is covered by a pyrotechnic initiator composition. The support has a thermal conductivity less than 20 mW/cm. degrees C. The resistive heating element has a thickness less than 1 x 10-6 m. The pyrotechnic composition consists of a binder and a primary explosive with a particle size between 1 x 10-6 and 30 x 10-6.