# US 2018/0024337 A1 · Color correcting collimation of light from a color over position light source > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2018/0024337 A1 - Document ID: US20180024337A1 - Status: Published application - Kind: A1 - Application number: 15/548,323 - Filed: 2016-01-26 - Published: 2018-01-25 - Earliest claimed: 2015-02-05 - Assignees: Philips Lighting Holding B.V. - Applicants: Philips Lighting Holding B.V. - Inventors: Oliver DROSS; Fetze PIJLMAN; Hendrikus Hubertus Petrus GOMMANS - Web page: https://patentgrep.com/patent/US20180024337A1 ## CPC - G02B 19/0028: {refractive and reflective surfaces, e.g. non-imaging catadioptric systems} - F21K 9/62: using mixing chambers, e.g. housings with reflective walls - G02B 19/0061: {the light source comprising a LED} - F21Y 2115/10: Light-emitting diodes [LED] - G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS - 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 - 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 collimator (3) for a color over position light source (2) is provided. The collimator (3) comprises a focal point (F), an optical axis (OA) containing the focal point (F), an imaging element (4) arranged around or on the optical axis (OA) and several light spreading elements (5, 11, 12) ranged around the optical axis (OA) to receive at least one image from the imaging element (4). The light spreading elements (5, 11, 12) have different light beam widening characteristics, the light beam widening characteristics of each light spreading element (5, 11, 12) of said light spreading elements (5, 11, 12) depending on the position of the light spreading element (5, 11, 12) relative to the focal point (F). The light spreading elements (5, 11, 12) are adapted to spread light striking the light spreading elements (5, 11,12) in a first plane (M) including the optical axis (OA). A method for collimating light from a color over position light source (2) is also provided. ## Claims ### Claim 1 A lighting device, comprising a collimator for a color over position light source, the collimator comprising: a focal point; an optical axis containing the focal point; an imaging element arranged around or on the optical axis, wherein the imaging element is configured to form at least one image of the light source; and several light spreading elements having a first set of light spreading elements and a second set of light spreading elements the first set of light spreading elements being located further from the optical axis and the light source than the second set of light spreading elements, arranged around the optical axis to receive said at least one image from the imaging element, wherein the imaging element generates a first image on the first set of light spreading elements and a second image on the second set of light spreading elements, said the first image is formed by light emitted from the light source at an angle smaller than eowith respect to the optical axis, and a second image is formed by light emitted at an angle larger than θ0, wherein the light spreading elements have different light beam widening characteristics, the light beam widening characteristics of each light spreading element of said light spreading elements depending on the position of the light spreading element relative to the focal point, and wherein the light spreading elements are adapted to spread light striking the first set of light spreading elements and the second set of light spreading elements in a first plane including the optical axis in such a way that the beam widening characteristics enable the first image and the second image to be spread over a substantially equal angle θ1, wherein the lighting device further comprises the color over position light source arranged on the focal point of the collimator so that light from the light source is received by the collimator. ### Claim 2 (depends on 1) The lighting device according to claim 1, wherein the imaging element is configured for one dimensional imaging. ### Claim 3 (depends on 1) The lighting device according to claim 1, wherein the imaging element) is configured for two dimensional imaging. ### Claim 4 (depends on 1) The lighting device according to claim 1, wherein the light beam widening characteristics of each light spreading element depend on an optical path length measured from the focal point to the light spreading element. ### Claim 5 (depends on 1) The lighting device according to claim 1, wherein the light beam widening characteristics of each light spreading element depend on the orthogonal distance from the optical axis to the light spreading element. ### Claim 6 (depends on 1) The lighting device according to claim 1, wherein the light spreading elements are adapted to spread light striking the light spreading elements in both the first plane and a second plane the second plane being orthogonal to the first plane and having a normal orthogonal to the optical axis. ### Claim 7 (depends on 1) The lighting device according to claim 1, wherein the light spreading elements are microlenses or facets. ### Claim 8 (depends on 1) The lighting device according to claim 1, wherein the light spreading elements are adapted to spread light striking the light spreading elements so that light beams having struck different light spreading elements are equally spread out in space. ### Claim 9 (depends on 1) The lighting device according to claim 1, wherein the light spreading elements are provided on a light redirecting surface of the collimator. ### Claim 10 (depends on 1) The lighting device according to claim 1, wherein the light spreading elements are provided on a light exit surface of the collimator. ### Claim 11 (depends on 1) The lighting device according to claim 1, wherein the collimator comprises a first lens and a second lens, the imaging element being formed by the first lens and the light spreading elements being provided on the second lens. ### Claim 12 (depends on 1) The lighting device according to claim 1, wherein the imaging element is configured to form at least two magnified images of the light source, including a first image generated on a first set of light spreading elements and a second image generated on a second set of light spreading elements, the first set of light spreading elements being located further from the optical axis and the light source than the second set of light spreading elements. ### Claim 13 A method for collimating light from a color over position light source, the method comprising: providing a collimator including: a focal point; an optical axis containing the focal point; an imaging element arranged around or on the optical axis, wherein the imaging element is configured to form at least one image of the light source; and several light spreading elements having a first set of light spreading elements and a second set of light spreading elements the first set of light spreading elements being located further from the optical axis and the light source than the second set of light spreading elements, arranged around the optical axis to receive said least one image from the imaging element, wherein the imaging element generates a first image on the first set of light spreading elements and a second image on the second set of light spreading elements, said the first image is formed by light emitted from the light source at an angle smaller than eowith respect to the optical axis, and a second image is formed by light emitted at an angle larger than θ0, wherein the light spreading elements have different light beam widening characteristics, the light beam widening characteristics of each light spreading element of said light spreading elements depending on the position of the light spreading element relative to the focal point, and wherein the light spreading elements are adapted to spread light striking the first set light spreading elements and the second set of light spreading elements in a first plane including the optical axis in such a way that the beam widening characteristics enable the first image and the second image to be spread over a substantially equal angle θ1; arranging the light source on the focal point of the collimator; and operating the light source, whereby the light spreading elements receive said at least one image of the light source from the imaging element, and whereby light striking the light spreading elements is spread in a first plane including the optical axis.