Person detecting device

Details Person detecting device Person detecting device

1988-10-27

1989-12-12

Solis, Jose M.

Electricity: measuring and testing

Conductor identification or location

Inaccessible

324 61P, 324 60CD, 340562, G01R 2726, G08B 2100

Patent

active

048870242

ABSTRACT:
A person detecting device detects the presence and absence of a person in a certain space such as a vehicle compartment. The device includes means for sensing the capacitance between a pair of electrodes with a space where a person may present, oscillating means for providing a first pulse signal and means for delaying the first pulse signal and providing a second pulse signal delayed in response to the capacitance. The device further includes means for receiving the first and second pulse signals and providing a third pulse signal of a duty ratio determined in response to the capacitance. The third pulse signal is further converted to a value representing the duty ratio which is compared with at least a reference value preset for judging as to the presence and absence of the person.

REFERENCES:
patent: 3864668 (1975-02-01), Bickford
patent: 3874474 (1975-04-01), Quantz
patent: 3898472 (1975-08-01), Long
patent: 3912939 (1975-10-01), Quantz
patent: 4065715 (1977-12-01), Jaffe
patent: 4295132 (1981-10-01), Burney
patent: 4348662 (1982-09-01), Fontaine
patent: 4476461 (1984-10-01), Cabubia
patent: 4491841 (1985-01-01), Clark
patent: 4796013 (1989-01-01), Yasuda

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