Patent ID: 6389972
Filing Date: 2002-05-21
Classification: F42B

Abstract:
An electro-pyrotechnic initiator suitable for use in igniting a pyrotechnic generator of gas for inflating an air bag, said initiator being connected to an electric cable comprising two conductive wires, said initiator comprising:i) a thermosensitive charge carried by a heating resistive element consisting of a resistive strip and initiatable by said heating resistive element, ii) an electric circuit connecting said resistive element to said conductive wires, and iii) means of electromagnetically protecting said electric circuit, wherein said heating resistive element, said electric circuit and said means of electromagnetically protecting are integrated into a circuit of conductive strips which are joined to said conductive wires and which are formed on a printed circuit support which is in the form of a thin parallelepipedal card with two opposite flat faces, wherein each of the two opposite flat faces of said support carries a complete circuit of conductive strips, each said complete circuit including a heating resistive element covered by a thermosensitive charge and means of electromagnetic protection printed on each of the two opposite faces of the circuit support, and around which said initiator is built, said circuit support being partially coated with an overmoulded insulation.