Traffic signal light having ambient light detection

A traffic signal (310) having a reflector (322, 400) having a plurality of reflective surfaces (330, 402) directing incident ambient light received from the signal lens (318) to a photodetector (322). The reflector is disposed proximate and about a plurality of LEDs (324, 406) which are pulse width...

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Bibliographische Detailangaben
Hauptverfasser:	HEALD ARTHUR D, ZALTA MICHAEL J, SHARP FRANK M
Format:	Patent
Sprache:	eng
Schlagworte:	ELECTRIC HEATING ELECTRIC LIGHTING NOT OTHERWISE PROVIDED FOR ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR ELECTRICITY PHYSICS SIGNALLING TRAFFIC CONTROL SYSTEMS
Online-Zugang:	Volltext bestellen
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Beschreibung
Zusammenfassung:	A traffic signal (310) having a reflector (322, 400) having a plurality of reflective surfaces (330, 402) directing incident ambient light received from the signal lens (318) to a photodetector (322). The reflector is disposed proximate and about a plurality of LEDs (324, 406) which are pulse width modulated by an integrated controller (360) to generate light which is also transmitted through the lens. The photodetector senses the incoming ambient light when the LEDs are in the "off" mode. Incident ambient light is focused by a lens to overfill the reflector and LEDs, and the photodetector is positioned within the redirected incident ambient light from the lens.