# US 11,906,430 B2 · Light source device including laser-excited light source > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,906,430 B2 - Document ID: US11906430B2 - Status: Granted - Kind: B2 - Application number: 17/035,568 - Filed: 2020-09-28 - Published: 2021-04-01 - Granted: 2024-02-20 - Earliest claimed: 2019-09-30 - Assignees: Ushio Denki Kabushiki Kaisha - Applicants: Ushio Denki Kabushiki Kaisha - Inventors: Kiyoyuki Kabuki; Yuichi Miura - Web page: https://patentgrep.com/patent/US11906430B2 ## CPC - G01N 21/6458: {Fluorescence microscopy (fluorescence microscopes per se G02B21/0076 and G02B21/16)} - H01S 5/02: Structural details or components not essential to laser action - G02B 21/16: adapted for ultraviolet illumination {; Fluorescence microscopes (G02B21/0076 takes precedence)} - G02B 27/141: {using dichroic mirrors} - G02B 27/145: {having sequential partially reflecting surfaces} - 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} - G01N 2021/6419: {Excitation at two or more wavelengths} - G01N 2201/062: LED's - 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 5/022: Mountings; Housings - H01S 5/02251: using optical fibres - 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 5/4025: {Array arrangements, e.g. constituted by discrete laser diodes or laser bar (H01S5/42 takes precedence)} - G01N: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES (measuring or testing apparatus or processes other than immunoassay, involving enzymes or microorganisms C12M, C12Q) - 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 - G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS ## Abstract A light source device includes at least one semiconductor laser and a laser-excited light source. The laser-excited light source has a phosphor excited by the semiconductor laser(s), and an optical system for extracting fluorescence emitted from the phosphor. The light source device also includes a plurality of LED light sources for emitting light having wavelengths different from a wavelength of the fluorescence. The light source device also includes a composite optical system for synthesizing the fluorescence from the laser-excited light source with the light from the LED light sources, and emitting the synthesized light from a light emitting portion. The LED light sources include an LED light source configured to emit light in an ultraviolet range. The LED light source configured to emit the light in the ultraviolet range is disposed at a position farther from the laser-excited light source than the remaining LED light source(s). ## Claims ### Claim 1 A light source device comprising: at least one semiconductor laser for excitation; a laser-excited light source having a phosphor excited by the at least one semiconductor laser, and a first optical system for extracting fluorescence emitted from the phosphor; a plurality of light emitting diode (LED) light sources for emitting light having wavelengths different from a wavelength of the fluorescence; and a second optical system for synthesizing the fluorescence from the laser-excited light source with the light from the plurality of LED light sources, and emitting the synthesized light from a light emitting portion, the plurality of LED light sources including an LED light source configured to emit light in an ultraviolet range, and of the plurality of LED light sources, the LED light source configured to emit the light in the ultraviolet range being disposed at a position farther from the laser-excited light source than the remaining LED light source or LED light sources configured to emit light of other wavelengths. ### Claim 2 (depends on 1) The light source device according to claim 1, wherein the plurality of LED light sources are arranged in a row along an optical axis of the first optical system. ### Claim 3 (depends on 2) The light source device according to claim 2, wherein the light emitting portion is situated at an end of the optical axis of the first optical system, and the LED light source for emitting light in the ultraviolet range is disposed at a position closest to the light emitting portion among the plurality of LED light sources. ### Claim 4 (depends on 2) The light source device according to claim 2, wherein each of the plurality of LED light sources emits light in a direction orthogonal to the optical axis, and the second optical system includes at least one dichroic mirror for converting a traveling direction of the light emitted from the plurality of LED light sources in a direction parallel to the optical axis of the first optical system, respectively. ### Claim 5 (depends on 4) The light source device according to claim 4, wherein said at least one dichroic mirror includes a plurality of dichroic mirrors that correspond to the plurality of LED light sources respectively, and the plurality of dichroic mirrors are disposed on the optical axis of the first optical system. ### Claim 6 (depends on 2) The light source device according to claim 2, wherein the plurality of LED light sources are arranged in sequence along the optical axis of the first optical system from a vicinity of the laser-excited light source toward the light emitting portion such that the wavelengths of the light emitted from the plurality of LED light sources decrease in sequence. ### Claim 7 (depends on 1) The light source device according to claim 1, wherein each of said LED light sources includes an LED, at least one collimating lens for collimating light emitted from the LED, and a first housing for housing the LED and said at least one collimating lens, and the first housing is made from metal. ### Claim 8 (depends on 7) The light source device according to claim 7 further comprising a second housing for housing the laser-excited light source and the second optical system, and wherein the first housing is disposed outside the second housing, and the second housing is made from metal. ### Claim 9 (depends on 8) The light source device according to claim 8, wherein the plurality of LED light sources have a plurality of said first housings, respectively, and the plurality of said first housing are fixed on a same wall of the second housing. ### Claim 10 (depends on 2) The light source device according to claim 2, wherein each of said LED light sources includes an LED, at least one collimating lens for collimating light emitted from the LED, and a first housing for housing the LED and said at least one collimating lens, and the first housing is made from metal. ### Claim 11 (depends on 10) The light source device according to claim 10 further comprising a second housing for housing the laser-excited light source and the second optical system, and wherein the first housing is disposed outside the second housing, and the second housing is made from metal. ### Claim 12 (depends on 11) The light source device according to claim 11 wherein the plurality of LED light sources have a plurality of said first housings, respectively, and the plurality of said first housing are fixed on a same wall of the second housing.