# US 2024/0053519 A1 · Optical angular filter > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2024/0053519 A1 - Document ID: US20240053519A1 - Status: Published application - Kind: A1 - Application number: 18/266,559 - Filed: 2021-11-22 - Published: 2024-02-15 - Earliest claimed: 2020-12-14 - Assignees: Isorg - Applicants: Isorg - Inventors: Jérôme MICHALLON; Benjamin BOUTHINON - Web page: https://patentgrep.com/patent/US20240053519A1 ## CPC - G02B 5/201: {in the form of arrays} - G02B 3/0006: {Arrays (G02B3/02, G02B5/188 take precedence)} - G02B 5/223: {containing organic substances, e.g. dyes, inks or pigments} - H10F 39/806: {Optical elements or arrangements associated with the image sensors} - G02B 2207/123: Optical louvre elements, e.g. for directional light blocking - G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS - H10F: INORGANIC SEMICONDUCTOR DEVICES SENSITIVE TO INFRARED RADIATION, LIGHT, ELECTROMAGNETIC RADIATION OF SHORTER WAVELENGTH OR CORPUSCULAR RADIATION ## Abstract An angular filter includes an array of microlenses, a first array of openings in a layer of a first resin and a second array of openings in a layer of a second resin. The first resin blocks at least a first radiation and the second resin blocks a second radiation, different from the first radiation. ## Claims ### Claim 1 An angular filter comprising: an array of microlenses, a first array of openings in a layer of a first resin and a second array of openings in a layer of a second resin, the first resin blocking at least a first radiation and the second resin blocking a second radiation, different from the first radiation, wherein the first array is arranged between the array of microlenses and the second array, and wherein the openings of the first array have, in the direction perpendicular to the axis of the openings, a larger surface area than the openings of the second array, in said direction. ### Claim 2 (depends on 1) The angular filter according to claim 1, wherein the first radiation corresponds to a radiation having a wavelength in the range from 700 nm to 1,700 nm, preferably in the range from 820 nm to 870 nm or from 910 nm to 970 nm. ### Claim 3 (depends on 1) The angular filter according to claim 1, wherein the second radiation corresponds to a radiation having a wavelength in the range from 400 nm to 600 nm, preferably from 470 nm to 600 nm. ### Claim 4 (depends on 1) The angular filter according to claim 1, wherein the second radiation corresponds to a radiation having a wavelength in the range from 600 nm to 700 nm, preferably from 600 nm to 680 nm. ### Claim 5 (depends on 1) The angular filter according to claim 1, wherein each opening of the first array has its center aligned with an opening of the second array and with the optical axis of a microlens. ### Claim 6 (depends on 1) The angular filter according to claim 1, comprising a protection layer 434 between the first array of openings and the second array of openings. ### Claim 7 (depends on 1) The angular filter according to claim 1, wherein the first resin blocks the first radiation. ### Claim 8 (depends on 7) The angular filter according to claim 7, wherein the first resin blocks the second radiation. ### Claim 9 (depends on 1) The angular filter according to claim 1, wherein the openings of the first array are holes, for example, filled with a material transparent to the second radiation and/or to the first radiation. ### Claim 10 (depends on 1) The angular filter according to claim 1, wherein the openings of the second array are holes, for example, filled with a material transparent to the second radiation and/or to the first radiation. ### Claim 11 (depends on 1) A manufacturing method to obtain an angular filter according to claim 1, the method comprising the steps of: a. forming, on a surface of an array of microlenses, a layer of a first resin so that the first resin and the planar surfaces of the microlenses face one another; b. illuminating with a light radiation the layer of the first resin through the array of microlenses a developing to form a first array of openings in the first resin; c. forming a layer of a second resin on the first array of openings, on a surface opposite to the microlens array; and d. illuminating with a light radiation the layer of the second resin through the array of microlenses a developing to form a second array of openings in the second resin. ### Claim 12 (depends on 1) A manufacturing method to obtain an angular filter according to claim 1, the method comprising the steps of: a. forming, on a surface of an array of microlenses, a layer of a transparent resin so that the transparent resin and the planar surfaces of the microlenses face one another; b. illuminating with a light radiation the transparent resin layer through the array of microlenses, developing to form a first array of pads in the transparent resin, and filling the spaces between the pads with a first resin; c. forming another transparent resin layer on the first array, on a surface opposite to the microlens array; and d. illuminating with a light radiation the other transparent resin layer through the array of microlenses, developing to form a second array of pads in the transparent resin, and filling the spaces between the pads with a second resin. ### Claim 13 (depends on 11) The method according to claim 11, wherein the light radiation of step d) is a collimated radiation. ### Claim 14 (depends on 11) The method according to claim 11, wherein the light radiation of step b) is a radiation less collimated than the light radiation of step d). ### Claim 15 (depends on 11) The method according to claim 11, wherein the light radiation is identical and collimated in steps b) and d). ### Claim 16 (depends on 11) The method according to claim 11, wherein the light radiations at steps b) and d) are ultraviolet radiations. ### Claim 17 (depends on 11) The method according to claim 11, comprising a step e), between step b) and step c), of forming of a protection layer on top of and in contact with the first array. ### Claim 18 (depends on 1) An image sensor comprising, at least: an image sensor formed of an array of photodetectors; and an angular filter according to claim 1.