Highway line detector

Details Highway line detector Highway line detector

1977-10-20

1979-03-06

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

250202, 250214B, H01J 3912

Patent

active

041432649

ABSTRACT:
A highway line detection system for an automobile which provides an output signal when a traffic line on a pavement under an automobile is about to be crossed. It includes a photoelectric sensor connected to an electrical bridge circuit, and the bridge circuit includes an impedance element which is varied in impedance responsive to the integrated output of the bridge circuit, and thereby the bridge circuit is maintained in balance for ambient light conditions. Further, the threshold of detection of the system, at which point an alarm is sounded, is varied as a function of the ambient light state, whereby the sensitivity of the system is increased for low light conditions and decreased for high light conditions to compensate for an opposite characteristic of the photosensor.

REFERENCES:
patent: 3719149 (1973-03-01), Masin
patent: 3811046 (1974-05-01), Levick
patent: 4003445 (1977-01-01), De Bruine

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