Observation apparatus
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United States of America Patent
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Aug 8, 2023
Grant Date -
N/A
app pub date -
Aug 23, 2021
filing date -
Aug 28, 2020
priority date (Note) -
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status (Latency Note)
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Abstract
An apparatus includes a display element, and an optical system configured to guide to an exit pupil the display light and external light. The optical system includes a first polarization separating element, a first optical unit, and a second optical unit that includes a half-transmissive reflective surface, a phase plate, and a second polarization separating element. The external light transmits through the first polarization separating element and the second optical unit toward the exit pupil. The display light transmits through the first polarization separating element, is reflected by the first optical unit and the first polarization separating element, is twice reflected by the second optical unit, and travels to the exit pupil. The display light forms an intermediate image in an optical path from the first optical unit to the second optical unit.
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