Dustproof lens and its module for LED road lamp
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United States of America Patent
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Apr 30, 2013
Grant Date -
Apr 26, 2012
app pub date -
Dec 28, 2011
filing date -
Jul 31, 2008
priority date (Note) -
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Abstract
A dustproof lens for an LED road lamp has an incident surface and an exit surface. The exit surface is flat. The incident surface is saddle-shaped and has a section in a shape of a concave curve along a road direction and in a shape of a convex curve vertically to the road direction. A lens module thereof has the dustproof lenses jointed with each other and has an integrally flat exit plane. The dustproof lens and its module, while meeting requirements in distributing lights for road lighting, adopt a flat surface for emitting lights, in such a manner that the lens is protected from dusts piled up thereon, can be cleaned simply, and is better fit for using. By accomplishing modularization of the lens module in production and assembly, a productive efficiency of lamps is greatly improved.
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