Twisted kaleido
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United States of America Patent
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Dec 25, 2018
Grant Date -
Jan 25, 2018
app pub date -
Jul 21, 2017
filing date -
Jul 22, 2016
priority date (Note) -
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status (Latency Note)
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Abstract
Implementations disclosed herein generally relate to a light pipe, or kaleido, for homogenizing light such that the light is uniform once the light exits the light pipe. By reflecting the light inside the light pipe, light uniformity is increased. In one implementation, a light pipe for an image projection apparatus is provided. The light pipe comprises an elongated rectangular body having a refractive index that provides total internal reflection within the elongated rectangular body. The elongated rectangular body has an input face for accepting light into the elongated rectangular body. The input face disposed substantially orthogonal to a longitudinal axis of the elongated rectangular body. The elongated rectangular body has an output face for releasing light from the elongated rectangular body. The output face is disposed substantially orthogonal to the longitudinal axis. The elongated rectangular body has a twist along the longitudinal axis.
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