# US 2019/0378960 A1 · Wavelength-converting element, projection apparatus, and manufacturing method of wavelength-converting element > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2019/0378960 A1 - Document ID: US20190378960A1 - Status: Published application - Kind: A1 - Application number: 16/380,983 - Filed: 2019-04-10 - Published: 2019-12-12 - Earliest claimed: 2018-06-11 - Assignees: Coretronic Corporation - Applicants: Coretronic Corporation - Inventors: I-HUA CHEN - Web page: https://patentgrep.com/patent/US20190378960A1 ## CPC - H10H 20/8512: {Wavelength conversion materials} - G02B 5/0205: {characterised by the diffusing properties} - G02B 5/0242: {by means of dispersed particles} - G02B 27/0977: {Reflective elements} - G03B 21/204: {using secondary light emission, e.g. luminescence or fluorescence (using different colours G03B33/00; if related to video signals H04N9/3197)} - G03B 21/2066: {Reflectors in illumination beam (in projection beam G03B21/28)} - H10H 20/835: {Reflective materials} - H10H 20/841: Reflective coatings, e.g. dielectric Bragg reflectors - H10H 20/0361: {of wavelength conversion means} - H10H 20/8515: {not being in contact with the bodies} - H10H: INORGANIC LIGHT-EMITTING SEMICONDUCTOR DEVICES HAVING POTENTIAL BARRIERS - G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS - G03B: APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR (optical parts of such apparatus G02B; photosensitive materials or processes for photographic purposes G03C; apparatus for processing exposed photographic materials G03D) ## Abstract A wavelength-converting element includes a substrate, a wavelength-converting layer and a diffuse reflection layer. The wavelength-converting layer is disposed above the substrate. The diffuse reflection layer is disposed between the substrate and the wavelength-converting layer. The diffuse reflection layer includes an inorganic binder and a plurality of diffuse reflection particles. The diffuse reflection particles are mixed with the inorganic binder. The inorganic binder includes an alcohol-soluble inorganic binder or a water-soluble inorganic binder. A projection apparatus using the wavelength-converting element and a manufacturing method of the wavelength-converting element are also provided. ## Claims ### Claim 1 A wavelength-converting element, comprising a substrate, a wavelength-converting layer and a diffuse reflection layer, wherein the wavelength-converting layer is disposed above the substrate; and the diffuse reflection layer is disposed between the substrate and the wavelength-converting layer, the diffuse reflection layer comprises an inorganic binder and a plurality of diffuse reflection particles, the plurality of diffuse reflection particles are mixed with the inorganic binder, and the inorganic binder comprises an alcohol-soluble inorganic binder or a water-soluble inorganic binder. ### Claim 2 (depends on 1) The wavelength-converting element according to claim 1, wherein the inorganic binder is the alcohol-soluble inorganic binder, and a component of the alcohol-soluble inorganic binder comprises a siloxane and a metal oxide. ### Claim 3 (depends on 1) The wavelength-converting element according to claim 1, wherein the inorganic binder is the water-soluble inorganic binder, and a component of the water-soluble inorganic binder comprises at least one of silica sol, phosphate, glass paste and water glass. ### Claim 4 (depends on 1) The wavelength-converting element according to claim 1, further comprising an intermediate layer disposed between the substrate and the diffuse reflection layer. ### Claim 5 (depends on 4) The wavelength-converting element according to claim 4, wherein a material of the intermediate layer comprises a silica gel, an epoxy resin or a thermal conductive adhesive. ### Claim 6 (depends on 5) The wavelength-converting element according to claim 5, wherein a thermal conductivity of the diffuse reflection layer is less than or equal to a thermal conductivity of the intermediate layer. ### Claim 7 (depends on 1) The wavelength-converting element according to claim 1, wherein a material of the plurality of diffuse reflection particles comprises at least one of titanium dioxide, silicon dioxide, aluminum oxide, boron nitride and zirconium dioxide. ### Claim 8 (depends on 1) The wavelength-converting element according to claim 1, wherein a width ratio of the diffuse reflection layer to the wavelength-converting layer in a direction parallel to the substrate is 0.7 to 1.5. ### Claim 9 (depends on 1) The wavelength-converting element according to claim 1, wherein a curing temperature of the inorganic binder is 200° C. to 300° C. ### Claim 10 (depends on 1) The wavelength-converting element according to claim 1, wherein the wavelength-converting layer comprises a phosphor in glass, a phosphor in ceramic, a polycrystalline fluorescent sheet, a monocrystalline fluorescent sheet or a phosphor in silicon. ### Claim 11 (depends on 1) The wavelength-converting element according to claim 1, wherein the wavelength-converting element is a wavelength-converting wheel, and the substrate is a turntable. ### Claim 12 A projection apparatus, comprising: an illumination system, a light valve and a projection lens, wherein the illumination system is adapted to provide an illumination beam, the light valve is disposed on a transmission path of the illumination beam to convert the illumination beam into an image beam, the projection lens is disposed on a transmission path of the image beam, the illumination system comprises an exciting light source and a wavelength-converting element, wherein the exciting light source is adapted to provide an exciting beam, the wavelength-converting element is disposed on a transmission path of the exciting beam, a wavelength-converting layer of the wavelength-converting element is adapted to convert the exciting beam into a converted beam, the illumination beam comprises the converted beam, and the wavelength-converting element comprises a substrate, the wavelength-converting layer and a diffuse reflection layer, wherein the wavelength-converting layer is disposed above the substrate; and the diffuse reflection layer is disposed between the substrate and the wavelength-converting layer, the diffuse reflection layer comprises an inorganic binder and a plurality of diffuse reflection particles, the plurality of diffuse reflection particles are mixed with the inorganic binder, and the inorganic binder comprises an alcohol-soluble inorganic binder or a water-soluble inorganic binder. ### Claim 13 A manufacturing method of a wavelength-converting element, comprising steps of: forming a diffuse reflection layer on a surface of a wavelength-converting layer, wherein the diffuse reflection layer comprises an inorganic binder and a plurality of diffuse reflection particles, the plurality of diffuse reflection particles are mixed with the inorganic binder, and the inorganic binder comprises an alcohol-soluble inorganic binder or a water-soluble inorganic binder; and bonding the diffuse reflection layer to a substrate. ### Claim 14 (depends on 13) The manufacturing method of a wavelength-converting element according to claim 13, wherein the inorganic binder is the alcohol-soluble inorganic binder, and a component of the alcohol-soluble inorganic binder comprises a siloxane and a metal oxide. ### Claim 15 (depends on 13) The manufacturing method of a wavelength-converting element according to claim 13, wherein the inorganic binder is the water-soluble inorganic binder, and a component of the water-soluble inorganic binder comprises at least one of silica sol, phosphate, glass paste and water glass. ### Claim 16 (depends on 13) The manufacturing method of a wavelength-converting element according to claim 13, wherein the step of forming the diffuse reflection layer on the surface of the wavelength-converting layer comprises steps of: coating or printing the diffuse reflection layer on the surface of the wavelength-converting layer; and curing the diffuse reflection layer at a temperature of 200° C. to 300° C. ### Claim 17 (depends on 13) The manufacturing method of a wavelength-converting element according to claim 13, wherein the step of bonding the diffuse reflection layer to the substrate comprises a step of: bonding the diffuse reflection layer to the substrate by an intermediate layer.