OPTICAL SYSTEM AND OBSERVATION APPARATUS HAVING THE SAME
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United States of America Patent
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Issued Date -
Jun 15, 2023
app pub date -
Dec 5, 2022
filing date -
Dec 10, 2021
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Abstract
An optical system is configured to form an enlarged image of a display surface of an image display element and includes, in order from a side of an exit pupil to a side of the display surface, a first half-transmissive reflective surface and a second half-transmissive reflective surface. The optical system has a first optical path on which light from the display surface transmits through the second half-transmissive reflective surface, is reflected by the first half-transmissive reflective surface, is reflected by the second half-transmissive reflective surface, transmits through the first half-transmissive reflective surface, and is guided to the exit pupil, and a second optical path on which light from the side of the exit pupil transmits through the first half-transmissive reflective surface, transmits through the second half-transmissive reflective surface, and is guided to an image sensor.
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