# US 12,215,849 B2 · Illumination device, optical element and luminaire > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,215,849 B2 - Document ID: US12215849B2 - Status: Granted - Kind: B2 - Application number: 18/280,754 - Filed: 2022-02-28 - Published: 2024-05-23 - Granted: 2025-02-04 - Earliest claimed: 2021-03-11 - Assignees: Signify Holding B.V. - Applicants: Signify Holding B.V. - Inventors: Peter Johannes Martinus Bukkems; Barry Mos; Simon Jacobus Maria Kuppens - Web page: https://patentgrep.com/patent/US12215849B2 ## CPC - F21V 3/06: characterised by the material - F21V 5/007: {Array of lenses or refractors for a cluster of light sources, e.g. for arrangement of multiple light sources in one plane (combination of two or more refractors F21V5/008)} - F21S 8/04: intended only for mounting on a ceiling or the like overhead structures (F21S8/02 takes precedence; {details of ceiling bases F21V21/03}) - F21V 7/0083: {Array of reflectors for a cluster of light sources, e.g. arrangement of multiple light sources in one plane (combination of two or more reflectors F21V7/0025)} - G02B 5/0231: {the surface having microprismatic or micropyramidal shape (macroscopic prism arrays G02B5/045)} - F21Y 2105/10: comprising a two-dimensional [2D] array of point-like light-generating elements - F21Y 2113/00: Combination of light sources - F21Y 2115/10: Light-emitting diodes [LED] - F21V: FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR - F21S: NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS - 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 An illumination device (100) provided with a support structure (10), an array of a plurality of spatially separated solid state lighting elements (11) mounted on a first side of the support structure (10), as well as an optical element (12) made from a light diffusing material for diffusing light emitted by the array of the plurality of spatially separated solid state lighting elements (11), the optical element (12) being mounted on the first side of the support structure and provided with a pattern formed of an array of a plurality of recessed portions (120) and an array of a plurality of elevated portions (122). ## Claims ### Claim 1 An illumination device comprising a support structure having a first side with mounted thereon: a plurality of spatially separated solid state lighting elements disposed in an array, and an optical element made of a solid, light transmissive, light diffusing, foam material, wherein the optical element is provided with a pattern of concaves, essentially each concave being formed by: a recessed portion of the concaves comprising a closed bottom wall, a circumferential side wall extending from the closed bottom wall to a light exit window, the light exit window bordering an apex of an elevated portion of the concaves and opposite to the closed bottom wall, and wherein the plurality of spatially separated solid state elements is arranged outside and upstream of the concaves and conformal to said pattern of concaves. ### Claim 2 (depends on 1) The illumination device according to claim 1, wherein the optical element has a back surface and a front surface opposite to the back surface of the optical element, wherein the optical element is mounted with said back surface on said first side of the support structure and downstream of the solid state elements, and wherein the optical element has a maximum thickness D between the back surface and the front surface at the apex of the elevated portions at least two times larger than the thickness Tr between the back surface and the front surface at the recessed portions. ### Claim 3 (depends on 2) The illumination device according to claim 2, wherein thickness Tr is in between 0.3*D and 0.5*D. ### Claim 4 (depends on 1) The illumination device according to claim 1, wherein the back surface is essentially flat. ### Claim 5 (depends on 1) The illumination device according to claim 1, wherein the solid state elements are partly recessed or partly embedded in the optical element at said back surface. ### Claim 6 (depends on 1) The illumination device according to claim 1, wherein the optical element is made in one piece. ### Claim 7 (depends on 1) The illumination device according to claim 1, wherein the array of the plurality of recessed portions is conformal to the array of the plurality of spatially separated solid state lighting elements. ### Claim 8 (depends on 1) The illumination device according to claim 1, wherein the array of the plurality of elevated portions is conformal to the array of the plurality of spatially separated solid state lighting elements. ### Claim 9 (depends on 1) The illumination device according to claim 1, wherein the solid foam material is a solid closed-cell foam material having a closed-cell volume of at least 80 volume-%. ### Claim 10 (depends on 9) The illumination device according to claim 9, wherein the closed-cells have a diameter in the range of 0.2-1.7 mm. ### Claim 11 (depends on 1) The illumination device according to claim 1, wherein the pattern formed of the array of the plurality of recessed portions and the array of the plurality of elevated portions have a polygon-shaped, an elliptical-shaped or a pyramidal-shaped circumference. ### Claim 12 (depends on 1) The illumination device according to claim 1, wherein the plurality of recessed portions having recessed side walls arranged under an angle α with respect to the structure, with a in a range of 50° to 80°. ### Claim 13 (depends on 1) The illumination device according to claim 1, wherein the support structure is provided with a further plurality of spatially separated solid state lighting elements disposed in an array mounted on the first side of the support structure and wherein the pattern formed of the array of the plurality of recessed portions and the array of the plurality of elevated portions is provided with an auxiliary recess conformal to the further plurality of spatially separated solid state lighting elements. ### Claim 14 (depends on 1) A luminaire comprising: an illumination device according to claim 1. ### Claim 15 (depends on 1, 14) An optical element for use in an illumination device according to claim 1 or in a luminaire according to claim 14, the optical element being made of a solid, light transmissive, light diffusing, foam material and provided with a pattern of concaves, wherein essentially each concave is formed by: a recessed portion of the concaves comprising a closed bottom wall, a circumferential side wall extending from the closed bottom wall to a light exit window, the light exit window bordering an apex of an elevated portion of the concaves and opposite to the closed bottom wall.