# US 10,480,724 B2 · Lighting device having a pumping light unit and luminescent element > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,480,724 B2 - Document ID: US10480724B2 - Status: Granted - Kind: B2 - Application number: 15/527,727 - Filed: 2015-11-05 - Published: 2017-12-07 - Granted: 2019-11-19 - Earliest claimed: 2014-11-18 - Assignees: OSRAM GmbH - Applicants: OSRAM GmbH - Inventors: Sergey Khrushchev; Andreas Breidenassel - Web page: https://patentgrep.com/patent/US10480724B2 ## CPC - F21V 9/30: Elements containing photoluminescent material distinct from or spaced from the light source (shades F21V1/17; globes, bowls or cover glasses F21V3/08, F21V3/12; refractors F21V5/10; reflectors F21V7/26, F21V7/30; elements with provision for controlling the spectral properties or intensity F21V9/40) - F21K 9/64: using wavelength conversion means distinct or spaced from the light-generating element, e.g. a remote phosphor layer - F21K 9/68: Details of reflectors forming part of the light source - F21V 5/04: of lens shape - F21V 5/10: comprising photoluminescent material - F21V 7/0066: {specially adapted to cooperate with point like light sources; specially adapted to cooperate with light sources the shape of which is unspecified (F21V7/16 - F21V7/30 take precedence)} - F21V 7/04: Optical design - F21V 13/14: the elements being filters or photoluminescent elements, reflectors and refractors - G02B 27/141: {using dichroic mirrors} - G02B 27/142: {Coating structures, e.g. thin films multilayers} - G03B 21/204: {using secondary light emission, e.g. luminescence or fluorescence (using different colours G03B33/00; if related to video signals H04N9/3197)} - 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} - F21Y 2115/30: Semiconductor lasers - H01S 5/0071: {for beam steering, e.g. using a mirror outside the cavity to change the beam direction} - H01S 5/32341: {blue laser based on GaN or GaP} - H01S 5/4025: {Array arrangements, e.g. constituted by discrete laser diodes or laser bar (H01S5/42 takes precedence)} - F21V: FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR - F21K: NON-ELECTRIC LIGHT SOURCES USING LUMINESCENCE; LIGHT SOURCES USING ELECTROCHEMILUMINESCENCE; LIGHT SOURCES USING CHARGES OF COMBUSTIBLE MATERIAL; LIGHT SOURCES USING SEMICONDUCTOR DEVICES AS LIGHT-GENERATING ELEMENTS; LIGHT SOURCES NOT OTHERWISE PROVIDED FOR - 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) - 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 - 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 lighting device provides a pump light unit for emitting pump light, a phosphor element for generating conversion light in response to excitation by the pump light, and a wavelength-dependent beam splitter which is reflective to the pump light and transmissive to the conversion light. The first pump light portion is incident on a light incidence surface of the beam splitter and is reflected from the beam splitter to the phosphor element. The element emits the conversion light in response to the excitation by the pump light. The conversion light is likewise incident on the light incidence surface, but transmitted by the beam splitter and exiting at a light exit surface of the beam splitter opposite the light incidence surface. Concurrently, the second pump light portion, reflected from the beam splitter, is directed onto the light exit surface of the beam splitter and is superposed with the conversion light. ## Claims ### Claim 1 A lighting device having a pump light unit for the emission of pump light, a phosphor element for the generation of conversion light in response to excitation by the pump light, and a wavelength-dependent beam splitter which is reflective to the pump light and transmissive to the conversion light, wherein a first portion of the pump light is incident on a light incidence surface of the beam splitter and is reflected from the beam splitter to the phosphor element, the phosphor element emitting the conversion light in response to the excitation by the pump light, the conversion light being incident on the light incidence surface of the beam splitter, but being transmitted by the beam splitter and exiting at a light exit surface of the beam splitter opposite the light incidence surface, and wherein at the same point in time, a second portion of the pump light is directed onto the light exit surface of the beam splitter and is reflected from the beam splitter and is superposed with the conversion light transmitted from the beam splitter, so that downstream of the beam splitter, mixed light made up of the pump light and the conversion light is available for lighting purposes a reflector arranged in a beam path containing the second portion of the pump light, upstream of the light exit surface of the wavelength-dependent beam splitter, and from which the second pump light portion is reflected to the wavelength-dependent beam splitter; wherein the reflector comprises a convex reflection surface from which the second portion of the pump light is bundled onto the light exit surface of the wavelength-dependent beam splitter. ### Claim 2 (depends on 1) The lighting device as claimed in claim 1, in which, directly downstream of the beam splitter, the second pump light portion has a primary direction of propagation and the conversion light has a primary direction of propagation, the primary directions of propagation being at an angle of not more than 10° with respect to one another. ### Claim 3 (depends on 1) The lighting device as claimed in claim 1, in which the beam splitter has a wavelength-dependent reflection layer which is interrupted in an interruption region, through which the second pump light portion passes and thus travels past the reflection layer and thereby passes through the beam splitter in a reflection-free manner. ### Claim 4 (depends on 3) The lighting device as claimed in claim 3, in which the interruption region is provided in the reflection layer as a pinhole or having a ring shape. ### Claim 5 (depends on 3) The lighting device as claimed in claim 3, in which a region of the reflection layer contributing to the light guidance has a reflection layer surface content taken in the layer directions of the reflection layer, and the interruption region has an interruption region surface content taken in the same directions, wherein the interruption region surface content is at a ratio of at most 1/5 with respect to the reflection layer surface content. ### Claim 6 (depends on 5) The lighting device as claimed in claim 5, in which the pump light unit is constructed from a plurality of pump light sources, wherein at least two of the pump light sources differ in their respective contribution to the first and the second pump light portion, and the at least two pump light sources are controllable independently of one another in such a way that the ratio of the first pump light portion to the second pump light portion is at least partially adjustable. ### Claim 7 (depends on 6) The lighting device as claimed in claim 6, in which the mixed light is white light, the color temperature of which is adjustable via the ratio of the first pump light portion to the second pump light portion. ### Claim 8 (depends on 3) The lighting device as claimed in claim 3, in which a scattering means is arranged in a beam path of the second pump light portion with reference to the propagation path of the second pump light portion. ### Claim 9 (depends on 8) The lighting device as claimed in claim 8, in which a diffuse reflector is provided as the scattering means and simultaneously as the reflector. ### Claim 10 (depends on 3) The lighting device as claimed in claim 3, in which an inner second pump light portion is directed through the interruption region and an outer second pump light portion travels laterally past the reflection layer, in which the second pump light portion travels laterally past a wavelength-dependent reflection layer of the beam splitter. ### Claim 11 (depends on 3) The lighting device as claimed in claim 3, in which an inner second pump light portion is directed through the interruption region and an outer second pump light portion travels laterally past the reflection layer, and in which the reflector, which is upstream of the light exit surface of the beam splitter in a beam path containing the second pump light portion, has a convex reflection surface from which the second pump light portion is bundled onto the light exit surface of the beam splitter. ### Claim 12 (depends on 3) The lighting device as claimed in claim 3, in which an inner second pump light portion is directed through the interruption region and an outer second pump light portion travels laterally past the reflection layer, and in which, downstream of the pump light unit and upstream of the light incidence surface of the beam splitter, a beam compression optical system is arranged in a beam path containing the first pump light portion past which the second pump light portion travels. ### Claim 13 (depends on 3) The lighting device as claimed in claim 3, in which an inner second pump light portion is directed through the interruption region and an outer second pump light portion travels laterally past the reflection layer, and in which a converging lens is arranged in a beam path containing the first pump light portion, downstream of the pump light unit and upstream of the light incidence surface of the beam splitter, the converging lens being enclosed by a plane-parallel plate, wherein the first pump light portion passes through the converging lens, and the second pump light portion passes through the plane-parallel plate. ### Claim 14 (depends on 3) The lighting device as claimed in claim 3, in which a diffuse scattering means is arranged in a beam path of the second pump light portion with reference to the propagation path of the second pump light portion. ### Claim 15 (depends on 1) The lighting device as claimed in claim 1, in which the second pump light portion travels laterally past a wavelength-dependent reflection layer of the beam splitter. ### Claim 16 (depends on 15) The lighting device as claimed in claim 15, in which, downstream of the pump light unit and upstream of the light incidence surface of the beam splitter, a beam compression optical system is arranged in a beam path containing the first pump light portion past which the second pump light portion travels. ### Claim 17 (depends on 15) The lighting device as claimed in claim 15, in which, downstream of the pump light unit and upstream of the light incidence surface of the beam splitter, a telescopic optical system is arranged in a beam path containing the first pump light portion past which the second pump light portion travels. ### Claim 18 (depends on 1) The lighting device as claimed in claim 1, in which a converging lens is arranged in a beam path containing the first pump light portion, downstream of the pump light unit and upstream of the light incidence surface of the beam splitter, the converging lens being enclosed by a plane-parallel plate, wherein the first pump light portion passes through the converging lens, and the second pump light portion passes through the plane-parallel plate.