Self contained and powered traffic signal using natural and...

Details Self contained and powered traffic signal using natural and... Self contained and powered traffic signal using natural and...

2006-05-09

2006-05-09

Alavi, Ali (Department: 2875)

Illumination

Automatic substitution of power supply or light source

C362S192000, C362S231000, C362S293000, C362S183000, C126S600000

Reexamination Certificate

active

07040773

ABSTRACT:
An traffic light capable of utilizing both natural sunlight and artificial light for illuminating selective traffic signals. Natural light is directed to a natural light router or switch and to a color switch for providing a red, amber or yellow, and a green light for each bank of traffic light signals. A controller is coupled to the natural light router and light emitting diodes for controlling the mode of operation for operating the traffic light with either electrically powered light emitting diodes or with natural light collected by the natural light collector. A sensor detects the adequacy of the natural light, and when insufficient, causes the controller to power an LED signal light. The natural light may either be amplitude modulated or time modulated so as to provide a desired high illumination output to the desired signal light. The power consumption is greatly reduced, as well as providing a more reliable traffic light substantially independent of power line interruptions or fluctuations. Any information, not only traffic signals, may be displayed.

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patent: 6895145 (2005-05-01), Ho

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