# US 11,028,988 B2 · Light source device and lighting device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,028,988 B2 - Document ID: US11028988B2 - Status: Granted - Kind: B2 - Application number: 16/184,125 - Filed: 2018-11-08 - Published: 2019-03-28 - Granted: 2021-06-08 - Earliest claimed: 2016-05-13 - Assignees: Panasonic Semiconductor Solutions Co., Ltd. - Applicants: Panasonic Intellectual Property Management Co., Ltd. - Inventors: Kazuhiko Yamanaka; Hideki Kasugai - Web page: https://patentgrep.com/patent/US11028988B2 ## CPC - F21S 41/16: Laser light sources - F21S 41/176: Light sources where the light is generated by photoluminescent material spaced from a primary light generating element - F21S 41/192: {Details of lamp holders, terminals or connectors} - F21S 41/25: Projection lenses - F21S 41/285: {Refractors, transparent cover plates, light guides or filters not provided in groups F21S41/24 - F21S41/2805} - F21S 41/321: {the reflector being a surface of revolution or a planar surface, e.g. truncated} - F21S 41/365: successively reflecting the light - F21S 41/39: Attachment thereof (achieving variable light distribution by movable reflectors F21S41/675) - F21S 45/70: Prevention of harmful light leakage - F21V 7/24: characterised by the material - F21V 9/32: characterised by the arrangement of the photoluminescent material - F21V 9/38: Combination of two or more photoluminescent elements of different materials - F21V 9/45: by adjustment of photoluminescent elements - F21V 13/14: the elements being filters or photoluminescent elements, reflectors and refractors - G02B 5/0205: {characterised by the diffusing properties} - G02B 27/1006: {for splitting or combining different wavelengths (G02B27/1086, G02B27/141 take precedence)} - H01S 5/005: {Optical components external to the laser cavity, specially adapted therefor, e.g. for homogenisation or merging of the beams or for manipulating laser pulses, e.g. pulse shaping (H01S5/026, H01S5/18388 take precedence)} - H01S 5/0087: {for illuminating phosphorescent or fluorescent materials, e.g. using optical arrangements specifically adapted for guiding or shaping laser beams illuminating these materials} - H01S 5/02326: Arrangements for relative positioning of laser diodes and optical components, e.g. grooves in the mount to fix optical fibres or lenses - H10H 20/8512: {Wavelength conversion materials} - F21Y 2115/30: Semiconductor lasers - H01S 5/02: Structural details or components not essential to laser action - H01S 5/02251: using optical fibres - H01S 5/02255: using beam deflecting elements - H01S 5/02469: {Passive cooling, e.g. where heat is removed by the housing as a whole or by a heat pipe without any active cooling element like a TEC} - H01S 5/06825: {Protecting the laser, e.g. during switch-on/off, detection of malfunctioning or degradation} - H01S 5/0683: by monitoring the optical output parameters - H01S 5/32341: {blue laser based on GaN or GaP} - 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 - G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS - H01S: DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL - H10H: INORGANIC LIGHT-EMITTING SEMICONDUCTOR DEVICES HAVING POTENTIAL BARRIERS - F21Y: INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED ## Abstract A light source device includes a semiconductor light-emitting device which emits coherent excitation light, and a wavelength conversion element which is spaced from the semiconductor light-emitting device, generates fluorescence by converting the wavelength of the excitation light emitted from semiconductor light-emitting device, and generates scattered light by scattering the excitation light. The wavelength conversion element includes a support member, and a wavelength converter disposed on the support member. The wavelength converter includes a first wavelength converter, and a second wavelength converter which is disposed around the first wavelength converter to surround the first wavelength converter in a top view of the surface of the support member on which the wavelength converter is disposed. The ratio of the intensity of fluorescence to that of scattered light is lower in the second wavelength converter than in the first wavelength converter. ## Claims ### Claim 1 A light source device, comprising: a semiconductor light-emitting device which emits excitation light that is coherent; and a wavelength conversion element which is spaced from the semiconductor light-emitting device, generates fluorescence by converting a wavelength of the excitation light emitted from the semiconductor light-emitting device, and generates scattered light by scattering the excitation light, wherein the wavelength conversion element includes a support member, and a wavelength converter disposed on the support member, the wavelength converter includes a first wavelength converter, and a second wavelength converter which is disposed around the first wavelength converter to surround the first wavelength converter in a top view of a surface of the support member on which the wavelength converter is disposed, the first wavelength converter has a first surface, a second surface and a lateral surface, the second surface faces the support member, the first surface is opposite to the second surface, and the lateral surface connects the first surface to the second surface, the wavelength conversion element includes a reflective member which covers part of at least part of the lateral surface, and the second wavelength converter is in direct contact with part of the lateral surface. ### Claim 2 (depends on 1) The light source device according to claim 1, wherein the first wavelength converter contains fluorescent particles and a transparent bonding material. ### Claim 3 (depends on 2) The light source device according to claim 2, wherein the first wavelength converter is a ceramic YAG fluorescent substance. ### Claim 4 (depends on 2) The light source device according to claim 2, wherein fluorescent particles contained in the second wavelength converter have an average particle diameter different from an average particle diameter of fluorescent particles contained in the first wavelength converter. ### Claim 5 (depends on 2) The light source device according to claim 2, wherein the fluorescent particles contained in the first wavelength converter have a volume proportion different from a volume proportion of the fluorescent particles contained in the second wavelength converter. ### Claim 6 (depends on 1) The light source device according to claim 1, wherein the second wavelength converter contains a fluorescent material different from a fluorescent material contained in the first wavelength converter. ### Claim 7 (depends on 1) The light source device according to claim 1, wherein the wavelength converter includes two or more first wavelength converters, and the second wavelength converter is disposed around the two or more first wavelength converters. ### Claim 8 (depends on 7) The light source device according to claim 7, wherein the two or more first wavelength converters are scanned with the excitation light. ### Claim 9 A light source device, comprising: a semiconductor light-emitting device which emits excitation light that is coherent; and a wavelength conversion element which is spaced from the semiconductor light-emitting device, generates fluorescence by converting a wavelength of the excitation light emitted from the semiconductor light-emitting device, and generates scattered light by scattering the excitation light, wherein the wavelength conversion element includes a support member, and a wavelength converter disposed on the support member, the wavelength converter includes two or more first wavelength converters disposed on the support member to be spaced from each other, and a second wavelength converter disposed around the two or more first wavelength converters to be in direct contact with each of the two or more first wavelength converters, each of the two or more first wavelength converters includes a first emitting region which emits a first emission light, the second wavelength converter includes a second emitting region which emits a second emission light, a chromaticity coordinate x of the first emission light of the first emitting region and chromaticity coordinate x of the second emission light of the second emitting region are each distributed between 0.2 and 0.4, and the two or more first wavelength converters are scanned with the excitation light. ### Claim 10 (depends on 9) The light source device according to claim 9, wherein the second wavelength converter has an average refractive index smaller than an average refractive index of the two or more first wavelength converters. ### Claim 11 (depends on 7) The light source device according to claim 7, wherein the two or more first wavelength converters are arranged in a matrix. ### Claim 12 (depends on 7) The light source device according to claim 7, wherein a projected pattern is formed corresponding to a pattern of the excitation light which scans the two or more first wavelength converters. ### Claim 13 (depends on 9) The light source device according to claim 9, wherein the two or more first wavelength converters are a ceramic YAG fluorescent substance. ### Claim 14 (depends on 1) The light source device according to claim 1, wherein the first wavelength converter contains a plurality of air voids. ### Claim 15 (depends on 9) The light source device according to claim 9, wherein the wavelength conversion element includes a reflective member disposed between the wavelength converter and the support member, and the reflective member covers at least part of each of lateral surfaces of the two or more first wavelength converters. ### Claim 16 (depends on 1) A lighting device, comprising: the light source device according to claim 1. ### Claim 17 (depends on 1) The light source device according to claim 1, wherein a ratio of an intensity of the fluorescence to an intensity of the scattered light is lower in the second wavelength converter than in the first wavelength converter. ### Claim 18 (depends on 1) The light source device according to claim 1, wherein the first wavelength converter includes a first emitting region into which part of the excitation light enters, and which emits a first emission light, the second wavelength converter includes a second emitting region into which another part of the excitation light enters, and which emits a second emission light, a chromaticity coordinate x of the first emission light of the first emitting region and chromaticity coordinate x of the second emission light of the second emitting region are each distributed between 0.2 and 0.4. ### Claim 19 (depends on 9) The light source device according to claim 9, wherein part of the excitation light enters the first emitting region, and another part of the excitation light enters the second emitting region. ### Claim 20 A light source device, comprising: a semiconductor light-emitting device which emits excitation light that is coherent; and a wavelength conversion element which is spaced from the semiconductor light-emitting device, generates fluorescence by converting a wavelength of the excitation light emitted from the semiconductor light-emitting device, and generates scattered light by scattering the excitation light, wherein the wavelength conversion element includes a support member, and a wavelength converter disposed on the support member, the wavelength converter includes a first wavelength converter, and a second wavelength converter which is disposed around the first wavelength converter to surround the first wavelength converter in a top view of a surface of the support member on which the wavelength converter is disposed, the first wavelength converter has a first surface, a second surface and a lateral surface, the second surface faces the support member, the first surface is opposite to the second surface, and the lateral surface connects the first surface to the second surface, the wavelength conversion element includes a reflective member which covers at least part of the lateral surface, a maximum height of the first wavelength converter from the surface of the support member is greater than a maximum height of the reflective member from the surface of the support member, and the second wavelength converter is in direct contact with at least part of the lateral surface which is located farther from the support member than the at least part of the lateral surface covered by the reflective member is.