	US 12,276,794 B2
	Optical device for augmented reality having improved light efficiency
Jeong Hun Ha, Seoul (KR)
Assigned to LETINAR CO., LTD, Anyang-si (KR)
Filed by LETINAR CO., LTD, Anyang-si (KR)
Filed on Oct. 6, 2022, as Appl. No. 17/961,207.
Application 17/961,207 is a continuation of application No. 17/024,503, filed on Sep. 17, 2020, granted, now 11,536,963.
Claims priority of application No. 10-2019-0114729 (KR), filed on Sep. 18, 2019; and application No. 10-2019-0173543 (KR), filed on Dec. 24, 2019.
Prior Publication US 2023/0033762 A1, Feb. 2, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. G02B 27/01 (2006.01); G02B 27/14 (2006.01)

CPC G02B 27/0172 (2013.01) [G02B 27/143 (2013.01); G02B 2027/0118 (2013.01); G02B 2027/0178 (2013.01)]

11 Claims

11. An optical device for augmented reality having improved light efficiency, the optical device comprising:

a reflective means configured to transfer augmented reality image light, which is image light corresponding to an image for augmented reality output from an image output unit, to a pupil of an eye of a user by reflecting the augmented reality image light toward the pupil, thereby providing the image for augmented reality to the user; and

an optical lens adapted such that the reflective means is embedded and disposed therein, and configured to transmit at least part of real object image light, which is image light output from a real object, therethrough toward the pupil of the eye of the user;

wherein the optical lens includes a first surface through which the augmented reality image light reflected from the reflective means and at least part of the real object image light go toward the pupil of the user and a second surface being opposite to the first surface and into which the real object image light enters;

wherein the reflective means includes a plurality of reflective units having a size of 4 mm or less that are embedded and arranged inside the optical lens to transfer the augmented reality image light, transferred to the reflective means, to the pupil of the user by reflecting the augmented reality image light;

wherein the plurality of reflective units are embedded and arranged at intervals inside the optical lens;

wherein at least two reflective units of the plurality of reflective units are arranged closer to the second surface of the optical lens as a distance from the image output unit increases; and

wherein, when the optical device for augmented reality is placed in front of the pupil of the user, assuming that a forward direction from the pupil is referred to as an x axis, any one of line segments being parallel to a vertical line between the image output unit and the x axis along the x axis and passing between the first and second surfaces of the optical lens is referred to as an y axis and a line segment perpendicular to both the x axis and the y axis is referred to as an z axis, then each of the plurality of reflective units is formed in bar shapes extending in a z-axis direction.