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Title: Occupancy detector apparatus for automotive safety systems

Abstract: Occupancy detector apparatus including a metallic electrode disposed to cooperate with the body of an automobile to form an occupant sensing capacitor, a reference capacitor, and an IC capacitance detecting and logic generating circuit. The IC includes a current source for continuously supplying charging current to the sensing capacitor and the reference capacitor, a first charge detecting circuit for detecting the charge on the sensing capacitor, a second charge detecting circuit for detecting the charge on the reference capacitor, and a comparator circuit for comparing the output signals developed by the first and second charge detecting circuits and for developing a logic output commensurate with the relationship between the capacitances of the sensing capacitor and the reference capacitor.


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Inventors: Long, David K. (Sunnyvale, CA, US)

Application Number: 544444
Filing Date: 1975-01-27
Publication_date: 1976-03-09
Assignee: Fairchild Camera and Instrument Corporation (Mountain View, CA)
Primary Class(es): 307/116
Other Classes:
US Patent Ref:
3751674Mar, 1972Holt340/278.
3864668Feb, 1975Bickford340/278.

Other Refs:
Primary Examiner: Hohauser, Herman
Assistant Examiner:
Attorney: MacPherson; Alan H., Richbourg; J. Ronald, Woodward; Henry K.