Importance

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Abstract

An igniter assembly for a gas generator used to inflate air bags or activate seat belt tensioners includes a header having a bridge element fabricated on a surface of the header. A pyrotechnic charge is applied to the bridge element so that delivering energy to the header heats the bridge thereby igniting the pyrotechnic material. The header includes metal sections separated by a insulating section of low thermal conductivity. A resistive film is applied to the header, across the metal sections and the insulating section. The bridge element is formed by laser cutting a kerf into the resistive film and thereby directing all current between the metal sections through a section of the film which comprises a resistor.

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First Claim