US 11,988,839 B2
Augmented reality apparatus and optical system therefor
Bing Xiao, Beijing (CN); Xiaobin Liang, Beijing (CN); and Chi Xu, Beijing (CN)
Assigned to MATRIXED REALITY TECHNOLOGY CO., LTD., Wuxi (CN)
Filed by MATRIXED REALITY TECHNOLOGY CO., LTD., Wuxi (CN)
Filed on May 30, 2023, as Appl. No. 18/325,986.
Application 18/325,986 is a continuation of application No. 16/930,061, filed on Jul. 15, 2020, granted, now 11,693,244.
Application 16/930,061 is a continuation in part of application No. PCT/CN2019/074876, filed on Feb. 12, 2019.
Claims priority of application No. 201810146738.7 (CN), filed on Feb. 12, 2018; application No. 201810146751.2 (CN), filed on Feb. 12, 2018; application No. 201810146905.8 (CN), filed on Feb. 12, 2018; application No. 201810146912.8 (CN), filed on Feb. 12, 2018; application No. 201810146915.1 (CN), filed on Feb. 12, 2018; application No. 201810147325.0 (CN), filed on Feb. 12, 2018; application No. 201810147326.5 (CN), filed on Feb. 12, 2018; application No. 201810147328.4 (CN), filed on Feb. 12, 2018; application No. 201810147330.1 (CN), filed on Feb. 12, 2018; application No. 201810147332.0 (CN), filed on Feb. 12, 2018; and application No. 201810147336.9 (CN), filed on Feb. 12, 2018.
Prior Publication US 2023/0296905 A1, Sep. 21, 2023
Int. Cl. G02B 27/01 (2006.01); G02B 1/11 (2015.01); G02B 27/09 (2006.01); G02B 27/12 (2006.01); G02B 27/14 (2006.01); G02B 27/28 (2006.01)
CPC G02B 27/0172 (2013.01) [G02B 27/017 (2013.01); G02B 1/11 (2013.01); G02B 27/0101 (2013.01); G02B 2027/0118 (2013.01); G02B 2027/013 (2013.01); G02B 2027/0178 (2013.01); G02B 2027/0185 (2013.01); G02B 27/0955 (2013.01); G02B 27/123 (2013.01); G02B 27/142 (2013.01); G02B 27/145 (2013.01); G02B 27/281 (2013.01); G02B 27/283 (2013.01); G02B 27/286 (2013.01)] 20 Claims
OG exemplary drawing
 
1. An optical system for an AR apparatus, comprising:
an image projection source;
a polarizing beam splitter having a beam-splitting side adjacent to the image projection source and a transmission side facing away from the image projection source, the polarizing beam splitter being arranged such that light emitted from the image projection source is able to be non-perpendicularly incident on and be at least partially reflected by the beam-splitting side, and the polarizing beam splitter being configured such that when light is incident on the beam-splitting side, a polarized light component, whose polarization is in a first direction, passes through the polarizing beam splitter and is transmitted through the transmission side thereof, and a polarized light component, whose polarization is in a second direction perpendicular to the first direction, is reflected from the beam-splitting side;
a polarizer disposed between the image projection source and the beam-splitting side of the polarizing beam splitter, and the polarizer is configured to allow polarized light, whose polarization is in the second direction, to be transmitted therethrough and polarized light, whose polarization is in the first direction to be absorbed;
a wave plate adjacent to the beam-splitting side, the light emitted from the image projection source being able to be at least partially reflected by the beam-splitting side towards the wave plate;
a semi-reflector located downstream of the wave plate in an optical path of reflected light; and
an additional wave plate and an additional polarizer which are located in this order distal to the semi-reflector, wherein the additional wave plate is configured such that when circularly polarized light is incident on it, linearly polarized light is able to exit, and the additional polarizer is configured to absorb the exiting linearly polarized light;
wherein the additional wave plate is in one of configurations including:
when the circularly polarized light is incident on it, a polarized light component, whose polarization is in the first direction, is able to exit, and wherein the additional polarizer is configured to absorb the polarized light component whose polarization is in the first direction, and
when the circularly polarized light is incident on it, a polarized light component, whose polarization is in the second direction, is able to exit, and wherein the additional polarizer is configured to absorb the polarized light component whose polarization is in the second direction,
wherein the additional wave plate and the additional polarizer are adhered together, and
wherein the semi-reflector is a curved semi-reflector, and the additional wave plate and the additional polarizer are in one of configurations including:
contours of the additional wave plate and the additional polarizer in a lateral direction substantially follow a curved shape of the semi-reflector,
contours of the additional wave plate and the additional polarizer in a longitudinal direction substantially perpendicular to the lateral direction substantially follow a curved shape of the semi-reflector, and
contours of the additional wave plate and the additional polarizer substantially follow a curved shape of the semi-reflector.