LED TRAFFIC SIGNAL DEVICE
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United States of America Patent
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Issued Date -
Jun 9, 2011
app pub date -
Feb 12, 2010
filing date -
Dec 7, 2009
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
The present invention provides a LED (Light Emitting Diodes) traffic signal device including a plurality of LEDs, a light-distribution lens and a Fresnel lens arranged between the plurality of LEDs and the light-distribution lens. The Fresnel lens is formed with multiple sections coaxially arranged with respect to an optical axis, every section having a different radius of curvature corresponding to a different focal distance.
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