Phosphor-loaded waveguide
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United States of America Patent
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Aug 11, 2020
Grant Date -
Jan 25, 2018
app pub date -
Feb 29, 2016
filing date -
Mar 9, 2015
priority date (Note) -
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Abstract
An improved waveguide is disclosed. The waveguide utilizes a luminescent material disposed within or around its perimeter to introduce additional light into the waveguide. For example, the waveguide may include a plurality of planar layers having different refractive indexes. A luminescent material may be disposed along the outer edge of these layers. When light from within the waveguide strikes the luminescent material, it emits light, thereby adding to the light in the waveguide. Not only does the luminescent material introduce more light into the waveguide, it also introduces more light sources, thereby making it more difficult to introduce a probe without blocking at least a portion of the light destined for the image sensor. The luminescent material may be a phosphor.
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