US 11,719,950 B2
Observation apparatus
Kazutaka Inoguchi, Tokyo (JP)
Assigned to CANON KABUSHIKI KAISHA, Tokyo (JP)
Filed by CANON KABUSHIKI KAISHA, Tokyo (JP)
Filed on Aug. 23, 2021, as Appl. No. 17/409,550.
Claims priority of application No. 2020-144484 (JP), filed on Aug. 28, 2020.
Prior Publication US 2022/0066228 A1, Mar. 3, 2022
Int. Cl. G02B 27/28 (2006.01); G02B 27/14 (2006.01)
CPC G02B 27/283 (2013.01) [G02B 27/14 (2013.01)] 20 Claims
OG exemplary drawing
 
1. An apparatus comprising:
a display element configured to emit display light to display an image; and
an optical system configured to guide to an exit pupil the display light and external light as light from an outside of the apparatus,
wherein the optical system includes:
a first polarization separating element;
a first optical unit that includes a reflective surface and has a power for incident light; and
a second optical unit that includes a half-transmissive reflective surface, a phase plate, and a second polarization separating element,
wherein the optical system causes the external light to transmit through the first polarization separating element and the second optical unit and to travel to the exit pupil,
wherein the optical system causes the display light to transmit through the first polarization separating element, to be reflected by the first optical unit and the first polarization separating element, to be twice reflected by the second optical unit, and to travel to the exit pupil, and
wherein the optical system causes the display light to form an intermediate image in an optical path from the first optical unit to the second optical unit.