# US 2024/0201423 A1 · Optical element and optical module > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2024/0201423 A1 - Document ID: US20240201423A1 - Status: Published application - Kind: A1 - Application number: 18/286,581 - Filed: 2021-12-29 - Published: 2024-06-20 - Earliest claimed: 2021-04-12 - Assignees: Zhejiang Crystal-Optech Co., Ltd. - Applicants: Zhejiang Crystal-Optech Co., Ltd. - Inventors: Huan Tao; Weiming Wu; Fenglei Liu - Web page: https://patentgrep.com/patent/US20240201423A1 ## CPC - G02B 3/0062: {Stacked lens arrays, i.e. refractive surfaces arranged in at least two planes, without structurally separate optical elements in-between} - G02B 3/0043: {Inhomogeneous or irregular arrays, e.g. varying shape, size, height} - G02B 3/0056: {arranged along two different directions in a plane, e.g. honeycomb arrangement of lenses (G02B3/0043 takes precedence; miniaturised objectives for electronic devices employing wafer level optics G02B13/0085)} - G02B 3/08: with discontinuous faces, e.g. Fresnel lens {(diffractive Fresnel lenses G02B5/1876)} - G02B 5/0215: {the surface having a regular structure} - G02B 27/0927: {Systems for changing the beam intensity distribution, e.g. Gaussian to top-hat} - G02B 27/0961: {Lens arrays (lens arrays per se G02B3/0006)} - G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS ## Abstract An optical element (100) and an optical module (200) are provided. The optical element (100) comprises a transparent substrate (110), an array microlens layer (120) and a Fresnel lens layer (130). The array microlens layer (120) and the Fresnel lens layer (130) are stacked on the transparent substrate (110), or the array microlens layer (120) and the Fresnel lens layer (130) are respectively located on two opposite sides of the transparent substrate (110), wherein the Fresnel lens layer (130) is used for adjusting an emergent angle of an incident light beam, and the array microlens layer (120) is used for homogenizing a light beam emitted by the Fresnel lens layer (130). ## Claims ### Claim 1 An optical element, comprising a transparent substrate, an array microlens layer, and a Fresnel lens layer, wherein the array microlens layer and the Fresnel lens layer are stacked on the transparent substrate, or the array microlens layer and the Fresnel lens layer are respectively located on two opposite sides of the transparent substrate, wherein the Fresnel lens layer is configured for adjusting an emergent angle of an incident light beam, and the array microlens layer is configured for homogenizing the light beam emerged from the Fresnel lens layer. ### Claim 2 (depends on 1) The optical element according to claim 1, wherein the array microlens layer is implemented by combining laser direct writing and embossing, or the array microlens layer is implemented by combining mask lithography and melting. ### Claim 3 (depends on 1) The optical element according to claim 1, wherein the Fresnel lens layer is made by combining mask lithography and etching, or by combining mask lithography and embossing, or by combining laser direct writing and embossing. ### Claim 4 (depends on 1) The optical element according to claim 1, wherein the array microlens layer comprises microlenses distributed along a same plane, and the microlenses at different positions have different shapes and sizes. ### Claim 5 (depends on 4) The optical element according to claim 4, wherein a light transmission surface of the microlens comprises any one of a concave surface, a convex surface, or a wavy curved surface. ### Claim 6 (depends on 4) The optical element according to claim 4, wherein adjacent microlenses are closely attached to each other, and a spacing between geometric centers of the adjacent microlenses is 1 um to 200 um. ### Claim 7 (depends on 4) The optical element according to claim 4, wherein a height of the microlens is 1 um to 100 um. ### Claim 8 (depends on 1) The optical element according to claim 1, wherein when the array microlens layer and the Fresnel lens layer are stacked on the transparent substrate, a difference between a refractive index n1 of the array microlens layer and a refractive index n2 of the Fresnel lens layer satisfies |n1−n2|≥0.2. ### Claim 9 (depends on 8) The optical element according to claim 8, wherein a spacer layer is further arranged between the array microlens layer and the Fresnel lens layer, a difference between the refractive index n1 of the array microlens layer and a refractive index n3 of the spacer layer satisfies |n1−n3|≥0.2, and a difference between the refractive index n2 of the Fresnel lens layer and the refractive index n3 of the spacer layer satisfies |n2−n3|≥0.2. ### Claim 10 (depends on 1) The optical element according to claim 1, wherein the Fresnel lens layer comprises a stepped Fresnel structure with a height h1 of 0.1 um to 10 um, or the Fresnel lens layer comprises a continuous Fresnel structure with a height h2 of 1 um to 100 um. ### Claim 11 (depends on 1) The optical element according to claim 1, wherein materials of the transparent substrate, the array microlens layer, and the Fresnel lens layer comprise any one of glass, resin, or plastic. ### Claim 12 (depends on 1) The optical element according to claim 1, wherein a thickness of the transparent substrate is 0.1 mm to 5 mm. ### Claim 13 (depends on 1) An optical module, comprising the optical element according to claim 1, and a light emitting module, wherein the optical element is located on an emergent light path of the light emitting module. ### Claim 14 (depends on 13) The optical element according to claim 13, wherein the light emitting module is a single light source, or the light emitting module is a module consisting of: a light source; and a lens, a mirror, or an aperture. ### Claim 15 (depends on 2) The optical element according to claim 2, wherein the Fresnel lens layer is made by combining mask lithography and etching, or by combining mask lithography and embossing, or by combining laser direct writing and embossing. ### Claim 16 (depends on 2) The optical element according claim 2, wherein the array microlens layer comprises microlenses distributed along a same plane, and the microlenses at different positions have different shapes and sizes. ### Claim 17 (depends on 3) The optical element according claim 3, wherein the array microlens layer comprises microlenses distributed along a same plane, and the microlenses at different positions have different shapes and sizes. ### Claim 18 (depends on 5) The optical element according to claim 5, wherein adjacent microlenses are closely attached to each other, and a spacing between geometric centers of the adjacent microlenses is 1 um to 200 um. ### Claim 19 (depends on 5) The optical element according to claim 5, wherein a height of the microlens is 1 um to 100 um. ### Claim 20 (depends on 6) The optical element according to claim 6, wherein a height of the microlens is 1 um to 100 um.