# US 12,111,482 B2 · Optical device for augmented reality > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,111,482 B2 - Document ID: US12111482B2 - Status: Granted - Kind: B2 - Application number: 17/416,849 - Filed: 2019-10-17 - Published: 2022-01-27 - Granted: 2024-10-08 - Earliest claimed: 2018-12-26 - Assignees: Letinar Co., Ltd - Applicants: Letinar Co., Ltd - Inventors: Jeong Hun Ha - Web page: https://patentgrep.com/patent/US12111482B2 ## CPC - G02B 27/0172: {characterised by optical features} - G02B 30/35: using reflective optical elements in the optical path between the images and the observer - G02B 6/00: Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings - G06T 19/006: {Mixed reality (object pose determination, tracking or camera calibration for mixed reality G06T7/00)} - G02B 2027/0178: {Eyeglass type (eyeglass details G02C)} - G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS - G06T: IMAGE DATA PROCESSING OR GENERATION, IN GENERAL ## Abstract An optical device for augmented reality includes an optical means for transmitting at least part of visible light therethrough, a reflective unit disposed inside the optical means, and an image output unit configured to output image light corresponding to an image for augmented reality toward the inner surface of the optical means. The image light corresponding to the image for augmented reality output from the image output unit is reflected at least once from the inner surface of the optical means and transferred to the reflective unit. The reflective unit reflects the transferred image light toward the pupil of an eye of a user, thereby providing the image for augmented reality to the user. ## Claims ### Claim 1 An optical device for augmented reality, the optical device comprising: an optical means for transmitting at least part of visible light therethrough; a reflective unit disposed inside the optical means; and an image output unit configured to output image light corresponding to an image for augmented reality toward an inner surface of the optical means; wherein the image light corresponding to the image for augmented reality output from the image output unit is reflected at least once by the inner surface of the optical means and transferred to the reflective unit; wherein a size of the reflective unit is 8 mm or less; and wherein the reflective unit reflects the transferred image light toward a pupil of an eye of a user, thereby providing the image for augmented reality to the user. ### Claim 2 (depends on 1) The optical device of claim 1, wherein an area of the reflective unit is formed to have a value of 16π (mm2) or less. ### Claim 3 (depends on 2) The optical device of claim 2, wherein the area of the reflective unit is an area of an orthogonal projection of the reflective unit projected onto a plane perpendicular to a forward direction from the pupil when the user gazes forward. ### Claim 4 An optical device for augmented reality, the optical device comprising: an optical means for transmitting at least part of visible light therethrough; a plurality of reflective units disposed inside the optical means; and an image output unit configured to output image light corresponding to an image for augmented reality toward an inner surface of the optical means; wherein the image light corresponding to the image for augmented reality output from the image output unit is reflected at least once by the inner surface of the optical means and transferred to the plurality of reflective units in partially separated manner; wherein each of the plurality of reflective units is disposed such that a distance to an adjacent reflective unit is 8 mm or less; and wherein the plurality of reflective units reflects off the transferred image light toward a pupil of an eye of a user, thereby providing the image for augmented reality to the user. ### Claim 5 (depends on 4) The optical device of claim 4, wherein each of the plurality of reflective units is disposed parallel to the inner surface of the optical means and alongside another of the plurality of reflective units in a first direction, which is a direction in which the image output unit is located, when viewed in a state in which the optical device is placed in front of the user. ### Claim 6 (depends on 5) The optical device of claim 5, wherein another plurality of reflective units is additionally disposed in a second direction that is perpendicular to the first direction. ### Claim 7 (depends on 4) The optical device of claim 4, wherein a reflective unit closer to the image output unit than a downstream reflective unit is disposed not to prevent image light output by the image output unit from being incident on the downstream reflective unit. ### Claim 8 (depends on 4) The optical device of claim 4, wherein a reflective unit closer to the image output unit than a downstream reflective unit is disposed to prevent part of image light output by the image output unit from being incident on the downstream reflective unit. ### Claim 9 (depends on 4) The optical device of claim 4, wherein each of the plurality of reflective units is disposed such that an angle formed by each of the reflective units with respect to the inner surface of the optical unit is same as an angle formed by the image light, reflected from the inner surface of the optical unit and passing by the reflective unit, with respect to the inner surface of the optical unit. ### Claim 10 (depends on 4) The optical device of claim 4, wherein the distance between the adjacent reflective units is a minimum value between points on boundary lines of orthogonal projections of the adjacent reflective units projected onto a plane perpendicular to a forward direction from the pupil when the user gazes forward.