Traffic signal light device
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United States of America Patent
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Sep 16, 2014
Grant Date -
May 2, 2013
app pub date -
Oct 19, 2012
filing date -
Oct 25, 2011
priority date (Note) -
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status (Latency Note)
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Abstract
A traffic signal light device that includes a spread window, a Fresnel lens, and an LED module for emitting light. The light emitted by the LED module passes through the Fresnel lens and to the spread window. The LED module is disposed at a position that is offset from an axis of the spread window that passes through a center of, and is perpendicular to, the spread window. The Fresnel lens can have a saw-toothed pattern of teeth formed as concentric circles on one surface of the Fresnel lens sharing a common center, where the size or height of the teeth vary. The spread window can have a plurality of protruding cells of varying size on a surface of the spread window.
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