OPTICAL DEVICE AND IMAGE DISPLAY APPARATUS
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United States of America Patent
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Issued Date -
Mar 5, 2015
app pub date -
Aug 26, 2014
filing date -
Aug 30, 2013
priority date (Note) -
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Abstract
A first diffraction optical element is disposed on a light incident surface of a light guide, a second diffraction optical element is disposed on a light emitting surface of the light guide, and a reflection layer is disposed on an end surface of the light guide. A diffraction grating of the first diffraction optical element and a diffraction grating of the second diffraction optical element has an inclined portion respectively. The inclined portion of the first diffraction optical element and the inclined portion of the second diffraction optical element are inclined in same direction.
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