Global Patent Index - EP 1316242 A1

EP 1316242 A1 2003-06-04 - CONSTANT OUTPUT SOLID STATE LIGHT SOURCE WITH ELECTRONICALLY FILTERED OPTICAL FEEDBACK

Title (en)

CONSTANT OUTPUT SOLID STATE LIGHT SOURCE WITH ELECTRONICALLY FILTERED OPTICAL FEEDBACK

Title (de)

LICHTQUELLE MIT KONSTANTER LEISTUNG MIT ELEKTRONISCH GEFILTERTER OPTISCHER RÜCKKOPPLUNG

Title (fr)

SOURCE LUMINEUSE ELECTRONIQUE A SORTIE CONSTANTE ET CONTRE-REACTION OPTIQUE FILTREE ELECTRONIQUEMENT

Publication

EP 1316242 A1 (EN)

Application

EP 01966371 A

Priority

  • US 0126915 W
  • US 65058800 A

Abstract (en)

[origin: WO0219777A1] A solid state traffic light apparatus provided with an optical feedback sensor ensuring a constant light intensity by detecting back-scattered light from a diffuser centered above an LED array. Control logic individually drives the LEDs, the drive characteristics being changed over time by the optical feedback to ensure a uniform beam intensity is generated at a intensity meeting DOT standards, across the life of the device, and as a function of ambient light conditions.

IPC 1-7 (main, further and additional classification)

H05B 33/08

IPC 8 full level (invention and additional information)

H05B 33/08 (2006.01)

CPC (invention and additional information)

H05B 33/0821 (2013.01); H05B 33/0851 (2013.01)

Citation (search report)

See references of WO 0219777A1

Designated contracting state (EPC)

AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR

DOCDB simple family

WO 0219777 A1 20020307; AT 282939 T 20041215; AU 8689301 A 20020313; DE 60107269 D1 20041223; EP 1316242 A1 20030604; EP 1316242 B1 20041117