# US 2021/0344883 A1 · Color conversion element > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2021/0344883 A1 - Document ID: US20210344883A1 - Status: Published application - Kind: A1 - Application number: 17/270,622 - Filed: 2019-07-23 - Published: 2021-11-04 - Earliest claimed: 2018-08-28 - Assignees: Panasonic Intellectual Property Management Co., Ltd. - Applicants: Panasonic Intellectual Property Management Co., Ltd. - Inventors: Takanori AKETA; Yosuke HONDA; Takashi KISHIDA; Toru HIRANO - Web page: https://patentgrep.com/patent/US20210344883A1 ## CPC - G02B 26/008: {in the form of devices for effecting sequential colour changes, e.g. colour wheels} - H04N 9/3158: {for controlling the spectrum} - G02B 5/206: {comprising particles embedded in a solid matrix} - G02B 5/285: {comprising deposited thin solid films (G02B5/281 - G02B5/289 take precedence; multilayered film filters for fibre optic multiplexing G02B6/29361)} - 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)} - H04N 9/3152: {for shaping the light beam (beam shaping per se G02B27/09)} - H04N 9/3161: {using laser light sources (using laser beams scanning the display screen H04N9/3129)} - G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS - H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION - 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 color conversion element includes: a substrate; a phosphor portion that is disposed above the substrate, receives laser light transmitted from an outside, and emits light in a color different from a color of the laser light; a reflective layer that includes a dielectric multilayer film and is disposed on a principal surface of the phosphor portion facing the substrate; and a joining portion interposed between the reflective layer and the substrate to join the reflective layer and the substrate. The joining portion includes an air layer that exposes the reflective layer in a position where the air layer at least partially overlaps an irradiation region in a plan view, the irradiation region being a region irradiated with the laser light on the phosphor portion. ## Claims ### Claim 1 A color conversion element, comprising: a substrate; a phosphor portion that is disposed above the substrate, receives laser light transmitted from an outside, and emits light in a color different from a color of the laser light; a reflective layer that includes a dielectric multilayer film and is disposed on a principal surface of the phosphor portion, the principal surface of the phosphor portion being a surface facing the substrate; and a joining portion that is interposed between the reflective layer and the substrate to join the reflective layer and the substrate, wherein the joining portion includes an air layer that exposes the reflective layer in a position where the air layer at least partially overlaps an irradiation region in a plan view, the irradiation region being a region irradiated with the laser light on the phosphor portion. ### Claim 2 (depends on 1) The color conversion element according to claim 1, wherein a recessed portion is provided in a principal surface of the substrate in a position where the recessed portion at least partially overlaps the irradiation region in the plan view, and the air layer is provided above the recessed portion, the principal surface of the substrate being a surface facing the phosphor portion. ### Claim 3 (depends on 1) The color conversion element according to claim 1, wherein a recessed portion group including a plurality of recessed portions is provided on the principal surface of the substrate in a position where the recessed portion group at least partially overlaps the irradiation region in the plan view, and the air layer is provided above the recessed portion group. ### Claim 4 (depends on 1) The color conversion element according to claim 1, wherein the joining portion includes a communication hole that communicates the air layer with the outside. ### Claim 5 (depends on 1) The color conversion element according to claim 1, wherein the phosphor portion and the reflective layer each have an annular shape in the plan view, and the joining portion only joins the substrate and an outer peripheral portion of the reflective layer located in a more outward position than the irradiation region. ### Claim 6 (depends on 1) The color conversion element according to claim 1, wherein the phosphor portion is disposed above the substrate with a normal direction of the principal surface of the phosphor portion being tilted with respect to an incident direction of the laser light on the phosphor portion. ### Claim 7 (depends on 6) The color conversion element according to claim 6, wherein an angle between the normal direction and the incident direction is greater than or equal to a critical angle between air and the phosphor portion. ### Claim 8 (depends on 1) The color conversion element according to claim 1, wherein the phosphor portion includes a plurality of individual pieces having a sheet shape and being planarly arranged, the plurality of individual pieces including at least one type of phosphor. ### Claim 9 (depends on 1) The color conversion element according to claim 1, wherein the phosphor portion is embedded in the substrate, with a side of the phosphor portion being at least partially in contact with the substrate.