# US 12,191,429 B2 · Light emitting device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,191,429 B2 - Document ID: US12191429B2 - Status: Granted - Kind: B2 - Application number: 17/706,092 - Filed: 2022-03-28 - Published: 2022-10-13 - Granted: 2025-01-07 - Earliest claimed: 2021-04-08 - Assignees: Nichia Corporation - Applicants: Nichia Corporation - Inventors: Norimasa Yoshida - Web page: https://patentgrep.com/patent/US12191429B2 ## CPC - H10H 20/8514: {characterised by their shape, e.g. plate or foil} - H10H 20/855: Optical field-shaping means, e.g. lenses - F21S 41/176: Light sources where the light is generated by photoluminescent material spaced from a primary light generating element - F21S 41/19: Attachment of light sources or lamp holders (achieving variable light distribution by movable light sources F21S41/657) - F21S 41/285: {Refractors, transparent cover plates, light guides or filters not provided in groups F21S41/24 - F21S41/2805} - F21S 41/635: {by moving refractors, filters or transparent cover plates} - F21S 41/657: by moving light sources - F21V 9/38: Combination of two or more photoluminescent elements of different materials - F21V 14/08: by movement of the screens {or filters} - H10H 20/8512: {Wavelength conversion materials} - H10H 20/8513: {having two or more wavelength conversion materials} - H10H 20/8515: {not being in contact with the bodies} - H10H 20/0361: {of wavelength conversion means} - H10H: INORGANIC LIGHT-EMITTING SEMICONDUCTOR DEVICES HAVING POTENTIAL BARRIERS - F21S: NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS - F21V: FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR ## Abstract A light emitting device includes: a light emitting unit; an optical member configured to transmit or pass light emitted by the light emitting unit, the optical member including: a first region configured to transmit or pass light having a first chromaticity; and a second region configured to transmit or pass light having a second chromaticity different from the first chromaticity; and a movable member configured to move to change a distance between the light emitting unit and the optical member along an optical axis of the light emitting unit. ## Claims ### Claim 1 A camera flash comprising: a light emitting device comprising: a light emitting unit; an optical member configured to transmit or pass light emitted by the light emitting unit, the optical member comprising: a first region configured to transmit or pass light having a first chromaticity; and a second region configured to transmit or pass light having a second chromaticity different from the first chromaticity; and a movable member configured to move to change a distance between the light emitting unit and the optical member along an optical axis of the light emitting unit. ### Claim 2 (depends on 1) The camera flash according to claim 1, wherein: the optical member is configured to extract mixed light that includes light emitted by the light emitting unit and transmitted or passed through the first region, and light emitted by the light emitting unit and transmitted or passed through the second region; and the movable member is configured to change the distance between the light emitting unit and the optical member to change a chromaticity of the mixed light. ### Claim 3 (depends on 1) The camera flash according to claim 1, wherein: the optical member further comprises a third region configured to transmit or pass light having a third chromaticity different from the first chromaticity and the second chromaticity; the optical member is configured to extract mixed light that includes light emitted by the light emitting unit and transmitted or passed through the first region, light emitted by the light emitting unit and transmitted or passed through the second region, and light emitted by the light emitting unit and transmitted or passed through the third region; and the movable member is configured to change the distance between the light emitting unit and the optical member to change a chromaticity of the mixed light so as to follow a blackbody locus. ### Claim 4 (depends on 1) The camera flash according to claim 1, wherein: the optical member overlaps the light emitting unit in a plan view; and the light emitting device further comprises a light distribution member on a surface of the optical member on a light emitting unit side, the light distribution member being configured to define a distribution of light from the light emitting unit. ### Claim 5 (depends on 1) The camera flash according to claim 1, wherein the second region surrounds the first region. ### Claim 6 (depends on 1) The camera flash according to claim 1, wherein: the first region comprises at least one of: a passing portion configured to allow the light emitted by the light emitting unit to pass through, a color filter configured to transmit light of a first wavelength of the light emitted by the light emitting unit, or a wavelength conversion member configured to convert the light emitted by the light emitting unit into the light of the first wavelength; and the second region includes at least one of: a transmitting portion configured to transmit the light emitted by the light emitting unit, a color filter configured to transmit light of a second wavelength of the light emitted by the light emitting unit, or a wavelength conversion member configured to convert the light emitted by the light emitting unit into the light of the second wavelength. ### Claim 7 (depends on 1) The camera flash according to claim 1, wherein: the light emitting device further comprises a light diffusion unit configured to diffuse light transmitted or passed through the optical member, the light diffusion unit located on a side opposite to the light emitting unit with the optical member interposed between the light diffusion unit and the light emitting unit. ### Claim 8 (depends on 1) The camera flash according to claim 1, wherein: the light emitting device further comprises an irradiation side light distribution member located on a side opposite to the light emitting unit with the optical member interposed between the irradiation side light distribution member and the light emitting unit, the irradiation side light distribution member being configured to define a distribution of light transmitted or passed through the optical member. ### Claim 9 A camera flash comprising: a light emitting device comprising: a light emitting unit; an optical member configured to transmit or pass light emitted by the light emitting unit, the optical member comprising: a first region configured to transmit or pass light having a first chromaticity; and a second region configured to transmit or pass light having a second chromaticity different from the first chromaticity; a light emission side light distribution member disposed between the light emitting unit and the optical member, the light emission side light distribution member being configured to define a distribution of light from the light emitting unit; and a movable member configured to move to change a distance between the light emitting unit and the light emission side light distribution member in a direction along an optical axis of the light emitting unit. ### Claim 10 (depends on 9) The camera flash according to claim 9, wherein: the optical member is configured to extract mixed light that includes light emitted by the light emitting unit and transmitted or passed through the first region, and light emitted by the light emitting unit and transmitted or passed through the second region; and the movable member is configured to change the distance between the light emitting unit and the light emission side light distribution member to change a chromaticity of the mixed light. ### Claim 11 (depends on 9) The camera flash according to claim 9, wherein the light emission side light distribution member comprises a lens. ### Claim 12 (depends on 9) The camera flash according to claim 9, wherein: the optical member further comprises a third region configured to transmit or pass light having a third chromaticity different from the first chromaticity and the second chromaticity; the optical member is configured to extract mixed light that includes light emitted by the light emitting unit and transmitted or passed through the first region, light emitted by the light emitting unit and transmitted or passed through the second region, and light emitted by the light emitting unit and transmitted or passed through the third region; and the movable member is configured to change the distance between the light emitting unit and the optical member to change a chromaticity of the mixed light so as to follow a blackbody locus. ### Claim 13 (depends on 9) The camera flash according to claim 9, wherein the second region surrounds the first region. ### Claim 14 (depends on 9) The camera flash according to claim 9, wherein: the first region comprises at least one of: a passing portion configured to allow the light emitted by the light emitting unit to pass through, a color filter configured to transmit light of a first wavelength of the light emitted by the light emitting unit, or a wavelength conversion member configured to convert the light emitted by the light emitting unit into the light of the first wavelength; and the second region includes at least one of: a transmitting portion configured to transmit the light emitted by the light emitting unit, a color filter configured to transmit light of a second wavelength of the light emitted by the light emitting unit, or a wavelength conversion member configured to convert the light emitted by the light emitting unit into the light of the second wavelength. ### Claim 15 (depends on 9) The camera flash according to claim 9, wherein: the light emitting device further comprises a light diffusion unit configured to diffuse light transmitted or passed through the optical member, the light diffusion unit located on a side opposite to the light emitting unit with the optical member interposed between the light diffusion unit and the light emitting unit. ### Claim 16 (depends on 9) The camera flash according to claim 9, wherein: the light emitting device further comprises an irradiation side light distribution member located on a side opposite to the light emitting unit with the optical member interposed between the irradiation side light distribution member and the light emitting unit, the irradiation side light distribution member being configured to define a distribution of light transmitted or passed through the optical member.