Communications: electrical – External condition vehicle-mounted indicator or alarm
Patent
1987-10-14
1989-04-25
Crosland, Donnie L.
Communications: electrical
External condition vehicle-mounted indicator or alarm
340903, 340435, 340555, 455605, 180167, G08G 100
Patent
active
048252115
ABSTRACT:
A warning device for use on a vehicle for sensing an approaching object when the vehicle is moving backward. The device produces a first signal when the object is in remote proximity of the vehicle and at least a second signal when the object is in close proximity of the vehicle. The device has a circuit for emitting intermittent infrared light when the vehicle is moving backward and a circuit for receiving the infrared light reflected from the object. The circuit for receiving produces a receive signal indicative of the received infrared light. The device further has an output of the circuit for receiving connected to two inverting inputs of both first and second differential amplifiers, inverting inputs of the first and second differential amplifiers being connected by a first and second variable resistors, respectively, to an applied voltage. First and second outputs of the first and second differential amplifiers, respectively, are connected to first and second inputs of an AND gate. An output of the AND gate is connected to a circuit for producing the second signal and the output of the first differential amplifier is connected to a circuit for producing the first signal.
REFERENCES:
patent: 3605082 (1971-09-01), Matthews
patent: 3840848 (1975-10-01), Marshall et al.
patent: 4207466 (1980-06-01), Drage et al.
patent: 4398172 (1983-08-01), Carroll et al.
patent: 4433328 (1984-02-01), Saphir et al.
Crosland Donnie L.
Poong-Kyu Lee
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