US 12,468,163 B2
Optical device for augmented reality having a function of adjusting depth of a virtual image
Jeong Hun Ha, Seoul (KR); and Soon Gi Park, Seoul (KR)
Assigned to LETINAR CO., LTD, Anyang-si (KR)
Appl. No. 18/255,359
Filed by LETINAR CO., LTD, Anyang-si (KR)
PCT Filed Jul. 9, 2021, PCT No. PCT/KR2021/008831
§ 371(c)(1), (2) Date May 31, 2023,
PCT Pub. No. WO2022/124510, PCT Pub. Date Jun. 16, 2022.
Claims priority of application No. 10-2020-0172721 (KR), filed on Dec. 10, 2020.
Prior Publication US 2024/0019706 A1, Jan. 18, 2024
Int. Cl. G02B 27/01 (2006.01)
CPC G02B 27/0179 (2013.01) [G02B 27/0172 (2013.01); G02B 2027/0185 (2013.01)] 9 Claims
OG exemplary drawing
 
1. An optical device for augmented reality having a function of adjusting a depth of a virtual image, the optical device comprising:
a display unit configured to display a virtual image;
focusing optics configured to refract or reflect virtual image light output from the virtual image displayed on the display unit;
a reflective unit including a plurality of reflective modules configured to provide the virtual image to a user by reflecting and transferring the virtual image light, refracted or reflected by the focusing optics, toward a pupil of the user's eye;
an optical means provided with the reflective unit including the plurality of reflective modules installed therein, and configured to transmit real object image light, output from a real object, toward the pupil of the user's eye;
a position adjustment device configured to move at least one of the display unit and the focusing optics in a direction parallel to an optical axis of the focusing optics;
a focal length tracking unit configured to measure a focal length of the user; and
a control unit configured to control movement of the position adjustment device based on the focal length of the user measured by the focal length tracking unit;
wherein the control unit controls the movement of the position adjustment device so that a depth of the virtual image displayed on the display unit corresponds to the focal length of the user measured by the focal length tracking unit.