# US 10,480,725 B2 · Light fixture and lens for a light fixture > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,480,725 B2 - Document ID: US10480725B2 - Status: Granted - Kind: B2 - Application number: 16/045,971 - Filed: 2018-07-26 - Published: 2019-01-31 - Granted: 2019-11-19 - Earliest claimed: 2017-07-26 - Assignees: Ledvance GmbH - Applicants: LEDVANCE GmbH - Inventors: Henrike Streppel - Web page: https://patentgrep.com/patent/US10480725B2 ## CPC - F21K 9/65: specially adapted for changing the characteristics or the distribution of the light, e.g. by adjustment of parts - F21K 9/237: Details of housings or cases, i.e. the parts between the light-generating element and the bases; Arrangement of components within housings or cases (F21K9/238 takes precedence) - F21V 5/045: {the lens having discontinuous faces, e.g. Fresnel lenses} - G02B 19/00: Condensers, {e.g. light collectors or similar non-imaging optics}(for microscopes G02B21/08) - G02B 19/0061: {the light source comprising a LED} - F21K 9/69: Details of refractors forming part of the light source - F21Y 2115/10: Light-emitting diodes [LED] - 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 - 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 - 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 fixture has a housing having a depression in which at least one light-emitting diode is received. The light-emitting diode is mounted on a mounting surface and in operation of the light fixture emits light with an initial emission angle of more than 80°. A lens is arranged downstream of the light-emitting diode, having a central focus area and an outer area radially surrounding the focus area. The central focus area is configured and/or arranged in such a way that a part of the light propagating through the focus area is focused in such a way that a final emission angle of the light propagated through the focus area is at least 50° and at most 80°. The outer area of the lens is spaced at least 2 mm from the mounting surface in a vertical direction. ## Claims ### Claim 1 A light fixture, comprising a housing having a depression in which at least one light-emitting diode is received, which is mounted on a mounting surface and which in operation of the light fixture emits light with an initial emission angle of more than 80°, and a lens arranged downstream of the light-emitting diode, having a central focus area and an outer area radially surrounding the focus area, wherein the central focus area is configured in such a way that a part of the light propagating through the focus area is focused in such a way that a final emission angle of the light propagated through the focus area is at least 50° and at most 80°, and the outer area of the lens is spaced at least 2 mm from the mounting surface in a vertical direction. ### Claim 2 (depends on 1) The light fixture according to claim 1, wherein at least one mounting component projecting in the vertical direction beyond the mounting surface is received in the depression of the housing, wherein a total radius of the focus area is at most as great as a lateral spacing between the light-emitting diode and the mounting component, and wherein a vertical spacing between the mounting surface and the outer area in the region of the mounting component is at least as great as a height of the mounting component in relation to the mounting surface. ### Claim 3 (depends on 1) The light fixture according to claim 1, wherein the lens closes the depression in the housing with a precise fit. ### Claim 4 (depends on 1) The light fixture according to claim 1, wherein the outer area encloses an angle of less than 90° with an optical axis of the lens. ### Claim 5 (depends on 4) The light fixture according to claim 4, wherein the focus area extends in the vertical direction at most as far as an outer plane defined by an upper outer edge of the outer area. ### Claim 6 (depends on 1) The light fixture according to claim 1, wherein the housing projects at least partially over the lens in the vertical direction and/or ends flush with an upper edge of the lens. ### Claim 7 (depends on 1) The light fixture according to claim 1, wherein the lens is designed in the manner of a Fresnel lens and/or the focus area has a central lens area and annular Fresnel steps radially surrounding the central lens area. ### Claim 8 (depends on 7) The light fixture according to claim 7, wherein the lens has precisely two annular Fresnel steps. ### Claim 9 (depends on 7) The light fixture according to claim 7, wherein the central lens area and the Fresnel steps are arranged on an upper face of the lens facing away from the light-emitting diode. ### Claim 10 (depends on 1) The light fixture according claim 1, wherein the lens has on an underside facing the light-emitting diode a cavity which is radially surrounded by an annular cavity step, wherein a cross-section of the cavity is trapezoidal. ### Claim 11 (depends on 10) The light fixture according to claim 10, wherein the cavity has a base surface and the cavity step has a cavity inner face facing the base surface and a cavity outer face facing away from the base surface, wherein the base surface and the cavity inner face form a part of a light entry surface of the lens and wherein the cavity outer face has a flatter configuration than the cavity inner face in relation to the base surface. ### Claim 12 (depends on 10) The light fixture according to claim 10, wherein at least one of the cavity and the cavity step is designed and arranged in such a way that a part of the light emitted by the light-emitting diode in operation of the light fixture impinges on the cavity step, and is at least partially deflected by means of total reflection on at least one of the cavity inner face and the cavity outer face of the cavity step. ### Claim 13 (depends on 10) The light fixture according to claim 10, wherein a light exit surface of the lens facing away from the light-emitting diode is roughened at least at some points. ### Claim 14 A lens for a light fixture, comprising an outer area, a central lens area and annular Fresnel steps radially surrounding the central lens area, wherein the lens is configured to focus light penetrating into the lens and propagating through the lens with an initial emission angle of more than 80° in such a way that a final maximum emission angle of the light propagated through the lens is at least 50° and at most 80°.