Optical element providing oblique illumination and apparatuses using same
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United States of America Patent
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Dec 22, 2015
Grant Date -
N/A
app pub date -
Feb 15, 2013
filing date -
Feb 15, 2013
priority date (Note) -
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Abstract
An optical element is provided having an asymmetric body with a base cavity for receiving a light source, and outer sides providing total internal reflection, and a front face tilted so that the optical element's optical axis is at an oblique angle with respect to a target surface. Curvatures along cavity surfaces and outer sides are selected to output illumination from the body's front face having a distribution extending along the target surface's height and at least a portion of the width thereof having increased intensity with increasing height to provide at least substantially uniform illumination along the target surface's height. One or more optical elements may be in an apparatus, and multiple apparatuses may be disposed in front of one edge of a target surface and spaced from each other to provide the target surface with at least substantially uniform oblique illumination.
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