# US 9,752,748 B2 · Projecting light fixture with a plurality of lenslets packed in an optimized dense circular pattern > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,752,748 B2 - Document ID: US9752748B2 - Status: Granted - Kind: B2 - Application number: 14/561,178 - Filed: 2014-12-04 - Published: 2015-06-11 - Granted: 2017-09-05 - Earliest claimed: 2013-12-05 - Assignees: Martin Professional ApS - Applicants: Martin Professional ApS - Inventors: Dennis Joergensen - Web page: https://patentgrep.com/patent/US9752748B2 ## CPC - 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)} - F21W 2131/406: for theatres, stages or film studios - F21Y 2105/18: annular; polygonal other than square or rectangular, e.g. for spotlights or for generating an axially symmetrical light beam - 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 - F21W: INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO USES OR APPLICATIONS OF LIGHTING DEVICES OR SYSTEMS - 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 comprising a plurality of light sources emitting, an optical gate; a light collector, an optical gate, and an optical projecting system adapted to image the optical gate at a distance along the optical axis. The light collector is adapted to collect light from a plurality of light sources and where the light collector comprises a plurality of lenslets collecting light from the light sources and convert the light into a plurality of light beams propagating along an optical axis. The lenslets are arranged in a dense pattern. A plurality of outermost adjacent lenslets is located along an outer circular boundary having the same radial distance to a center of the light collector. The dense pattern has been obtained by optimizing a packaging density defined by a ratio of a sum of areas of circular cross sections of the lenslets and an area of the outer circular boundary. ## Claims ### Claim 1 An illumination device comprising: a plurality of light sources emitting light along an optical axis; an optical gate arranged along the optical axis; a light collector arranged between the plurality of light sources and the optical gate, the light collector is adapted to collect light from the plurality of light sources, the light collector comprises a plurality of lenslets adapted to collect light from the light sources and is adapted to convert the collected light into a plurality of light beams, each lenslet comprises an entrance surface where the light enters the lenslet and an exit surface where the light exits the lenslet, the plurality of light beams propagate along the optical axis and through the optical gate; and an optical projecting system adapted to collect at least a part of the plurality of light beams and adapted to image the optical gate at a distance along the optical axis; wherein the plurality of lenslets are arranged in a dense pattern, wherein the lenslets comprise a plurality of outermost adjacent lenslets located along an outer circular boundary, wherein each of the plurality of outermost adjacent lenslets has a same radial distance to a center of the light collector, and wherein the dense pattern has been obtained by optimizing a packaging density defined by a ratio of a sum of areas of circular cross sections of the plurality of lenslets and an area of the outer circular boundary, and wherein the plurality of outermost adjacent lenslets comprise at least 7 outermost lenslets and the packaging density is at least 0.72. ### Claim 2 (depends on 1) The illumination device of claim 1 further comprising selecting a number of the plurality of lenslets from a group consisting of the following intervals: [18, 21]; [36, 38]; [54, 55]; [60,61]; [82, 87]; [113,122]; [148, 157]; [198, 201]; [234, 254]; [264, 276]; [291, 302]; [327, 337]; [498, 425]; [478, 501]; [560, 583]; [630, 660]; [718,747]; [779, 789]; [817, 847]; [910, 913]; [927, 933]; [1124, 1138]; [1231,1244]; [1415,1446]; and [1468,1500]. ### Claim 3 (depends on 1) The illumination device of claim 1 further comprising selecting a number of the plurality of lenslets that is equal to a value from a group consisting of: 19, 37, 55, 61, 85, 91, 121, 151, 199, 219, 235, 241, 270, 295, 301, 331, 349, 421, 481, 499, 528, 565, 631, 637, 649, 690, 745, 783, 847, 913, 931, 1003, 1015, 1027, 1039, 1045, 1092, 1133, 1180, 1201, 1236, 1244, 1278, 1304, 1379, 1420, 1427, 1436, 1446, and 1491. ### Claim 4 (depends on 1) The illumination device of claim 1 wherein the plurality of outermost adjacent lenslets comprises at least 12 outermost lenslets and the packaging density is at least 0.79. ### Claim 5 (depends on 4) The illumination device of claim 4 further comprising selecting a number of the plurality of lenslets from a group consisting of of the following intervals: [36, 38]; [54, 55]; [60,61]; [82, 87]; [113,122]; [148, 157]; [198, 201]; [234, 254]; [264, 276]; [291, 302]; [327, 337]; [498, 425]; [478, 501]; [560, 583]; [630, 660]; [718,747]; [779, 789]; [817, 847]; [910, 913]; [927, 933]; [1124, 1138]; [1231,1244]; [1415,1446]; and [1468,1500]. ### Claim 6 (depends on 1) The illumination device of claim 1 further comprising selecting a number of the plurality of lenslets that is equal to a value from a group consisting of: 37, 55, 61, 85, 91, 121, 151, 199, 219, 235, 241, 270, 295, 301, 331, 349, 421, 481, 499, 528, 565, 631, 637, 649, 690, 745, 783, 847, 913, 931, 1003, 1015, 1027, 1039, 1045, 1092, 1133, 1180, 1201, 1236, 1244, 1278, 1304, 1379, 1420, 1427, 1436, 1446, and 1491. ### Claim 7 (depends on 1) The illumination device of claim 1 wherein the light collector comprises at least 20 lenslets. ### Claim 8 (depends on 1) The illumination device of claim 1 wherein the packaging density is greater than 0.763 and less than 0.88. ### Claim 9 (depends on 1) The illumination device of claim 1 wherein each of the plurality of outermost adjacent lenslets are in contact with two adjacent other outermost located lenslets. ### Claim 10 (depends on 1) The illumination device of claim 1 wherein inner lenslets are arranged in a number of annular rings and wherein at least one of the number of annular rings comprises at least two sets of lenslets, each set of lenslets comprising a number of lenslets having a same radial distance to the center of the light collector and the radial distance to the center of the light collector is different for the at least two sets of lenslets and a difference between the radial distance of the outermost set of lenslets and the radial distance of an innermost set of lenslets is less than a half diameter of the lenslets. ### Claim 11 (depends on 1) The illumination device of claim 1 wherein the plurality of lenslets is arranged in an invariant pattern and wherein the invariant pattern is invariant under a 60 degrees rotation. ### Claim 12 (depends on 1) The illumination device of claim 1 wherein: each lenslet of the plurality of lenslets defines a disc corresponding to a substantial uniform circular cross section of the lenslet, wherein each disc of each lenslet includes a same diameter, and wherein the dense pattern has been obtained by optimizing the packaging density that is defined by the ratio of the sum of areas of the discs and an area of a container disc circumscribing the discs. ### Claim 13 (depends on 1) The illumination device of claim 1 wherein the dense pattern is a non-hexagonal pattern. ### Claim 14 (depends on 1) The illumination device of claim 1 wherein at least one of the plurality of lenslets have been omitted. ### Claim 15 (depends on 1) The illumination device of claim 1 wherein the plurality of light sources is arranged on a flat plane. ### Claim 16 A method of providing an illumination device, the method comprising: arranging a plurality of light sources for emitting light along an optical axis; arranging an optical gate along the optical axis; and providing and arranging a light collector to collect light from the plurality of light sources, wherein the light collector comprises a plurality of lenslets adapted to collect light from the plurality of light sources and adapted to convert the collected light into a plurality of light beams so that the plurality of light beams propagate along the optical axis and through the optical gate, wherein each lenslet of the plurality of lenslets comprises an entrance surface where said light enters the lenslet and an exit surface where the light exits the lenslet, and wherein each lenslet has a substantial uniform circular cross section of the lenslet, and arranging an optical projecting system to collect at least a portion of the plurality of light beams passing through the optical gate, the optical projecting system is adapted to image the optical gate at a distance along the optical axis; wherein providing the light collector includes: arranging the plurality of lenslets in a dense pattern, wherein the plurality of lenslets comprise a plurality of outermost lenslets located along an outer circular boundary, wherein each of the outermost lenslets includes a same radial distance to a center of the light collector, and optimizing a packaging density defined by a ratio of a sum of areas of the circular cross sections of the lenslets and an area of the outer circular boundary, and wherein the plurality of outermost adjacent lenslets comprise at least 7 outermost lenslets and the packaging density is at least 0.72. ### Claim 17 (depends on 16) The method of claim 16 further comprising selecting a number of the plurality of lenslets from a group consisting of the following intervals: [18, 21]; [36, 38]; [54, 55]; [60,61]; [82, 87]; [113,122]; [148, 157]; [198, 201]; [234, 254]; [264, 276]; [291, 302]; [327, 337]; [498, 425]; [478, 501]; [560, 583]; [630, 660]; [718,747]; [779, 789]; [817, 847]; [910, 913]; [927, 933]; [1124, 1138]; [1231,1244]; [1415,1446]; and [1468,1500]. ### Claim 18 (depends on 16) The method of claim 16 further comprising selecting a number of the plurality of lenslets that is equal to a value from a group consisting ofthe following numbers: 19, 37, 55, 61, 85, 91, 121, 151, 199, 219, 235, 241, 270, 295, 301, 331, 349, 421, 481, 499, 528, 565, 631, 637, 649, 690, 745, 783, 847, 913, 931, 1003, 1015, 1027, 1039, 1045, 1092, 1133, 1180, 1201, 1236, 1244, 1278, 1304, 1379, 1420, 1427, 1436, 1446, and 1491. ### Claim 19 An illumination device comprising: a plurality of light sources emitting light along an optical axis; an optical gate arranged along the optical axis; a light collector arranged between the plurality of light sources and the optical gate, the light collector is adapted to collect light from the plurality of light sources, the light collector comprises a plurality of lenslets adapted to collect light from the light sources and is adapted to convert the collected light into a plurality of light beams, each lenslet comprises an entrance surface where the light enters the lenslet and an exit surface where the light exits the lenslet, the plurality of light beams propagate along the optical axis and through the optical gate; and an optical projecting system adapted to collect at least a part of the plurality of light beams and adapted to image the optical gate at a distance along the optical axis; wherein the plurality of lenslets are arranged in a dense pattern, wherein the lenslets comprise a plurality of outermost adjacent lenslets located along an outer circular boundary, wherein each of the plurality of outermost adjacent lenslets has a same radial distance to a center of the light collector, and wherein the dense pattern has been obtained by optimizing a packaging density defined by a ratio of a sum of areas of circular cross sections of the plurality of lenslets and an area of the outer circular boundary, and wherein the packaging density is greater than 0.763 and less than 0.88.