US 11,754,837 B2
Optical device for augmented reality having external light leakage prevention function
Jeong Hun Ha, Seoul (KR)
Assigned to LETINAR CO., LTD, Anyang-si (KR)
Appl. No. 17/606,409
Filed by LETINAR CO., LTD, Anyang-si (KR)
PCT Filed Apr. 20, 2020, PCT No. PCT/KR2020/005211
§ 371(c)(1), (2) Date Oct. 25, 2021,
PCT Pub. No. WO2020/218790, PCT Pub. Date Oct. 29, 2020.
Claims priority of application No. 10-2019-0049149 (KR), filed on Apr. 26, 2019.
Prior Publication US 2022/0197031 A1, Jun. 23, 2022
Int. Cl. G02B 27/01 (2006.01); F21V 8/00 (2006.01); G06T 19/00 (2011.01)
CPC G02B 27/017 (2013.01) [G02B 6/0031 (2013.01); G06T 19/006 (2013.01); G02B 2027/0178 (2013.01)] 8 Claims
OG exemplary drawing
 
1. An optical device for augmented reality having an external light leakage prevention function, the optical device comprising:
a display device configured to output image light corresponding to an image for augmented reality;
at least one reflective unit configured to transfer the image light corresponding to an image for augmented reality, output from the display device, to a pupil of an eye of a user by reflecting the image light toward the pupil, thereby providing the image for augmented reality to the user; and
an optical means configured such that the reflective unit is disposed therein and configured to transmit at least part of image light, output from a real object, therethrough toward the pupil of the eye of the user;
wherein the at least one reflective unit is formed to have a size of 4 mm or less, and includes a first surface configured to reflect the image light corresponding to an image for augmented reality, output from the display device, toward the pupil of the eye of the user and a second surface which is a surface opposite to the first surface; and
wherein the second surface is made of a light absorbing material that does not reflect light.