| 摘要 |
PURPOSE:To positively actuate an air bag even when a vehicle collides at its front pillar section by providing a collision detecting means for the circumference of a front glass to detect damages made around the front glass. CONSTITUTION:When a collision is made in such a way that the front section of our vehicle creeps into the lower section of a vehicle running ahead, that is, the rear section of the vehicle running ahead collides against the front glass 71 and each front pillar 72 of our vehicle, a part of an optical fiber 11 set in each front pillar 72 is cracked or disconnected. A part of light irradiated by an light emitting section 12 leaks out of a place where the optical fiber is cracked, and the whole of light irradiated by the light emitting section 12 can not be received by a light receiving section 13, so that the output level of the light receiving section 13 is thereby lowered. Therefore, a transistor is turned on so as to allow an air bag to be expanded.
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