# US 2025/0208331 A1 · Method and system for integration of refractive optics with a diffractive eyepiece waveguide display > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2025/0208331 A1 - Document ID: US20250208331A1 - Status: Published application - Kind: A1 - Application number: 19/076,889 - Filed: 2025-03-11 - Published: 2025-06-26 - Earliest claimed: 2020-05-14 - Assignees: Magic Leap, Inc. - Applicants: Magic Leap, Inc. - Inventors: Chulwoo Oh; Ravi Kumar Komanduri; Vikramjit Singh; Shuqiang Yang; Frank Y. Xu - Web page: https://patentgrep.com/patent/US20250208331A1 ## CPC - G02B 6/0033: {Means for improving the coupling-out of light from the light guide} - G02B 6/0076: {Stacked arrangements of multiple light guides of the same or different cross-sectional area} - G02B 25/001: {Eyepieces} - G02B 27/0172: {characterised by optical features} - G02B 1/118: having sub-optical wavelength surface structures designed to provide an enhanced transmittance, e.g. moth-eye structures - G02B 6/262: {Optical details of coupling light into, or out of, or between fibre ends, e.g. special fibre end shapes or associated optical elements} - G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS ## Abstract A method of fabricating an optical element includes providing a substrate, forming a castable material coupled to the substrate, and casting the castable material using a mold. The method also includes curing the castable material and removing the mold. The optical element includes a planar region and a clear aperture adjacent the planar region and characterized by an optical power. ## Claims ### Claim 1 A method of fabricating an optical element, the method comprising: providing a substrate; forming a castable material coupled to the substrate; casting the castable material using a mold; curing the castable material; and removing the mold; wherein the optical element comprises a planar region and a clear aperture adjacent the planar region and characterized by an optical power. ### Claim 1 A viewing optics assembly including a viewing area, the viewing optics assembly comprising: a first cover plate including a first region having a first optical power and a first planar region laterally adjacent to the first region and positioned outside the viewing area; a waveguide having a world side and a user side; and a second cover plate having a second optical power, wherein the first optical power and second optical power have different values with respect to each other; wherein the waveguide is disposed between the first cover plate and the second cover plate. ### Claim 2 (depends on 1) The method of claim 1 wherein the substrate comprises a cover glass. ### Claim 3 (depends on 2) The method of claim 2 wherein the cover glass is planar. ### Claim 4 (depends on 1) The method of claim 1 wherein the substrate comprises a planar polymer structure. ### Claim 5 (depends on 1) The method of claim 1 wherein the castable material comprises a UV cured resin. ### Claim 6 (depends on 1) The method of claim 1 wherein the mold comprises an anti-stiction coating. ### Claim 7 (depends on 6) The method of claim 6 wherein the anti-stiction coating is hydrophobic. ### Claim 8 (depends on 6) The method of claim 6 wherein the anti-stiction coating comprises silicon oxide or silicon nitride. ### Claim 9 (depends on 1) The method of claim 1 wherein casting the castable material comprises forming nano-features in the castable material. ### Claim 10 (depends on 9) The method of claim 9 wherein the nano-features are diffractive features configured to reduce reflection at an interface of the castable material. ### Claim 12 (depends on 11) The viewing optics assembly of claim 11 wherein: the first cover plate is disposed adjacent the world side of the waveguide; and the second cover plate is disposed adjacent the user side of the waveguide. ### Claim 13 (depends on 11) The viewing optics assembly of claim 11 wherein the first optical power is positive and the second optical power is negative. ### Claim 14 (depends on 11) The viewing optics assembly of claim 11 wherein the first optical power and an absolute value of the second optical power are equal. ### Claim 15 (depends on 11) The viewing optics assembly of claim 11 wherein the first region of the first cover plate comprises nano-features. ### Claim 16 (depends on 15) The viewing optics assembly of claim 15 wherein the nano-features comprise an anti-reflection structure. ### Claim 17 (depends on 11) The viewing optics assembly of claim 11 wherein the second cover plate includes a second region having the second optical power, wherein the second region comprises nano-features. ### Claim 18 (depends on 11) The viewing optics assembly of claim 11 wherein the second cover plate comprises a second region having the second optical power and a second planar region laterally 2 adjacent to the second region, wherein the second region is positioned outside the viewing area. ### Claim 19 (depends on 11) The viewing optics assembly of claim 11 wherein: the first cover plate is separated from the world side of the waveguide by a first distance; and the second cover plate is separated from the user side of the waveguide by a second distance. ### Claim 20 (depends on 11) The viewing optics assembly of claim 11 wherein: the second cover plate is configured to diverge light rays generated by the waveguide; and the first cover plate is configured to compensate for the second optical power of the second cover plate.