Optical device including diffraction elements for diffracting light inside of a light guide, image projecting apparatus, and electronic device
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United States of America Patent
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Feb 14, 2017
Grant Date -
Oct 1, 2015
app pub date -
Mar 17, 2015
filing date -
Mar 31, 2014
priority date (Note) -
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status (Latency Note)
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Abstract
An optical device includes a light guide plate; a first diffraction element that is a transmission type diffraction element provided on a first face of the light guide plate and that diffracts and ejects at least a portion of light which is guided along inside the light guide plate; a second diffraction element that is a transmission type diffraction element provided on the first face of the light guide plate and that diffracts at least a portion of light proceeding to the light guide plate; and a third diffraction element that is a reflection type diffraction element provided on a face which is an opposite face of the light guide plate from the first face, and that diffracts at least a portion of light which enters an inside of the light guide plate via the second diffraction element.
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