Railway switches and signals – Signals – Light beam projecting
Patent
1996-05-13
1997-12-16
Le, Mark T.
Railway switches and signals
Signals
Light beam projecting
34081545, 34081565, B61L 900
Patent
active
056975848
ABSTRACT:
A railroad searchlight signal for producing light signals of selected colors. The searchlight uses a reflector that has an inner surface of reflective material and a focal point. One or more light emitting diodes are provided at the reflector focal point. When a current is supplied to the light emitting diode from a variable current power source, a light having a color that varies dependent upon the current is produced. The colored light produced at the light emitting diode is then directed outward of the reflector as a beam. At least one color filter that allows light of a respective color to pass therethrough is preferably provided proximate the reflector. Light that passes through the color filter is detected by a light detector such as a photovoltaic cell, a phototransistor or a photodiode.
REFERENCES:
patent: 2503786 (1950-04-01), Wells
patent: 2520445 (1950-08-01), Sponsler
patent: 3576563 (1971-04-01), Scott
patent: 4283716 (1981-08-01), Pasquali
patent: 4700278 (1987-10-01), Chew
patent: 4754272 (1988-06-01), Illenberg et al.
Specification sheet for Rainbow (RGB) LED packages, Ledtronics, Inc., 400 Pacific Coast Highway Torrance, CA 90505, (no date).
Le Mark T.
Sembrat Kevin A.
Union Switch & Signal Inc.
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