Patent ID: 7304256

Claim:
A thin film-form seating detection switch capable of detecting whether or not a passenger is seated in a seat, comprising: a film-form substrate made of insulating material; a first conductor fixed to one of the surfaces of the film-form substrate, including a first terminal at one end and a first electrode at the other end; a second conductor fixed to said one of the surfaces of the film-form substrate including a second terminal at one end and a second electrode at the other end, said second conductor being insulated from said first conductor; a film-form member disposed on said one of the surfaces of the film-form substrate, said film-form member being slightly spaced from the film-form substrate via a spacer and substantially parallel to the film-form substrate; and a third conductor pair fixed to the surface of the film-form member facing the film-form substrate, and a fourth conductor fixed to said one of the surfaces of the film-form substrate including a third electrode corresponding to the first electrode at one end and a fourth electrode corresponding to the second electrode at the other end, said fourth conductor being insulated from said first conductor and second conductor; wherein the first and third electrodes and one of the third conductor pair form a first switch portion, the second and fourth electrodes and the other of the third conductor pair form a second switch portion, and the first and second switch portions form an AND circuit, wherein when a passenger sits down in a seat on which the seating detection switch is provided, at least one of a part of the film-form substrate and a part of the film-form member bends due to the weight of the passenger, the first and third electrodes become conductive via said one of the third conductor pair, the second and fourth electrodes become conductive via said other of the third conductor pair, and thereby the first electrode and the second electrode enter a condition of mutual conductivity via the third conductor.