OPTICAL ELEMENT AND ILLUMINATION APPARATUS
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United States of America Patent
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Feb 28, 2017
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Sep 30, 2014
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Abstract
An optical element according to an embodiment is formed from a material transparent to visible light and has a rotationally symmetrical shape with respect to the central axis. A cavity containing no transparent material is provided inside the optical element. The inner surface of the cavity has a shape in which a boundary line of the cavity along which a plane including the central axis intersects the inner surface includes a curve portion expanding toward the outside of the optical element. The inner surface of the cavity does not include any surface recessed inwardly.
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