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US20150159831A1 OPTICAL ELEMENT AND LIGHT EMITTING DEVICE INCLUDING THE SAME 有权
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OPTICAL ELEMENT AND LIGHT EMITTING DEVICE INCLUDING THE SAME
Abstract:
An optical element includes a lens includes a surface of incidence on which light is incident from a light source, a first optical surface recessed toward the light source, and a second optical surface extending from the first optical surface, and a cover arranged on the lens to cover at least a part of the first optical surface.
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