Light guide device and virtual image display apparatus
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United States of America Patent
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Oct 23, 2018
Grant Date -
Aug 3, 2017
app pub date -
Aug 12, 2015
filing date -
Aug 18, 2014
priority date (Note) -
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status (Latency Note)
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Abstract
A light guide device that does not cause non-uniformity in image light and external light and does not cause ghosts, and a virtual image display apparatus provided with the light guide device. The light guide device includes a parallel light guide, an incident section, and an emission section. Here, the light guide device is set such that image light rays are reflected without reflecting from a boundary surface between the parallel light guide and the reflection unit and head for an observer. Thus, the image light rays only pass through half mirrors, which are positioned in positions where the image light rays are emitted from the reflection unit of the emission section or are positioned therearound. Accordingly, it is possible to prevent luminance non-uniformity or light reduction by reducing the number of times of the image light rays to be observed pass through the half mirrors.
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