Color light signal using light emitting diodes

Details Color light signal using light emitting diodes Color light signal using light emitting diodes

B - Operations, Transporting

61

L

346/104, 240/58

B61L 5/18 (2006.01) H05B 37/00 (2006.01)

Patent

CA 1240024

ABSTRACT A colour light signal especially adapted to railroad use has a cluster of diodes in place of a conventional incandescent source and each diode is located behind a collimating lens (the diodes may be located behind individual lenses or the entire cluster of diodes may be behind a single lens, if desired) and is positioned so the on-axis energy emitted from each diode is so directed that the combined wavefront is seen by the lens to originate at its focus, so that the dispersed energy is collimated into a signal beam of high-intensity and high directionality.

482750

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