Optical element, lighting device and luminaire
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United States of America Patent
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Jan 16, 2018
Grant Date -
Oct 20, 2016
app pub date -
Dec 24, 2014
filing date -
Jan 3, 2014
priority date (Note) -
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status (Latency Note)
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Abstract
Disclosed is an optical element (10) comprising a central cavity (20) extending from a first aperture (12) to a second aperture (14) of the optical element, said central cavity gradually widening in a direction from the first aperture to the second aperture, said central cavity being delimited by a stack of transparent frustums (30) including a first frustum defining the first aperture and a final frustum defining the second aperture, each frustum having a prismatic outer surface (32) having a first surface portion (34) tapering in the direction from the second aperture to the first aperture and a continuous inner surface (36), wherein the respective continuous inner surfaces combine to delimit said central cavity. Also disclosed is a lighting device including such an optical element and a luminaire including such a lighting device.
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