# US 9,435,508 B2 · Lighting device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,435,508 B2 - Document ID: US9435508B2 - Status: Granted - Kind: B2 - Application number: 14/232,531 - Filed: 2012-07-06 - Published: 2014-06-19 - Granted: 2016-09-06 - Earliest claimed: 2011-07-11 - Assignees: LG Innotek Co., Ltd. - Applicants: Dong Hyun Lee; Dong Mug Seong; Jun Phill Eom; Beom Sun Hong - Inventors: Dong Hyun Lee; Dong Mug Seong; Jun Phill Eom; Beom Sun Hong - Web page: https://patentgrep.com/patent/US9435508B2 ## CPC - F21V 5/004: {using microlenses} - 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}) - F21Y 2105/00: Planar light sources - G02B 3/0056: {arranged along two different directions in a plane, e.g. honeycomb arrangement of lenses (G02B3/0043 takes precedence; miniaturised objectives for electronic devices employing wafer level optics G02B13/0085)} - G02B 5/0278: {used in transmission} - 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 - 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 - G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS ## Abstract Disclosed is a light device comprising: a diffusion unit for diffusing and radiating light incident from a light source; and a condensing unit installed on a light radiating surface of the diffusion unit, including a micro lens array of lenses having sag determined depending on one of a light emitting area of the lighting device and total light flux of the lighting device. Thus, the lighting device can reduce a light flux emitted at the angle between 65 deg and 90 deg, thereby meeting UGR conditions. ## Claims ### Claim 1 A lighting device, comprising: a light source unit; a diffusion unit for diffusing light emitted from the light source unit; and a condensing unit including a microlens array on a light emitting surface of the diffusion unit; wherein the microlens array includes a plurality of lenses having a sag determined based on any one of a light emitting area and a total luminous flux, and wherein the lenses of the plurality of lenses are spaced apart from each other. ### Claim 2 (depends on 1) The lighting device of claim 1, wherein the diffusion unit and the condensing unit are bonded so as to form a spaced part. ### Claim 3 (depends on 2) The lighting device of claim 2, further comprising a support frame between the diffusion unit and the condensing unit. ### Claim 4 (depends on 2) The lighting device of claim 2, further comprising an adhesive material interposed between the diffusion unit and the condensing unit. ### Claim 5 (depends on 4) The lighting device of claim 4, wherein a coating area of the adhesive material is less than 70% of a total area of the light emitting surface of the diffusion unit. ### Claim 6 (depends on 2) The lighting device of claim 2, further comprising a light diffusion member between the diffusion unit and the condensing unit. ### Claim 7 (depends on 1) The lighting device of claim 1, further comprising a roughness pattern having roughness on one surface or both surfaces of a surface of the diffusion unit and a surface of the condensing unit which are opposite to each other. ### Claim 8 (depends on 1) The lighting device of claim 1, wherein the sag ranges from 0.1 to 0.25. ### Claim 9 (depends on 8) The lighting device of claim 8, wherein a unified glare rating (UGR) is 19 or below. ### Claim 10 (depends on 9) The lighting device of claim 9, wherein the condensing unit enables the luminous flux emitted from the light source unit to be reduced at 65-90 degrees. ### Claim 11 (depends on 10) The lighting device of claim 10, wherein the condensing unit is disposed on a plate. ### Claim 12 (depends on 11) The lighting device of claim 11, wherein the plate contains any one material of polycarbonate (PC), polymethylmethacrylate (PMMA), and polyethylene terephthalate (PET). ### Claim 13 (depends on 11) The lighting device of claim 11, wherein the microlens array is made of a different material from that of the plate. ### Claim 14 (depends on 13) The lighting device of claim 13, wherein the microlens array is made of a photocurable or thermosetting resin. ### Claim 15 (depends on 11) The lighting device of claim 11, wherein the microlens array is directly formed on the plate. ### Claim 16 A lighting device, comprising: a light source unit; a diffusion unit for diffusing light emitted from the light source unit; a condensing unit including a microlens array on a light emitting surface of the diffusion unit; and a light diffusion member between the diffusion unit and the condensing unit; wherein the microlens array includes a plurality of lenses having a sag determined based on any one of a light emitting area and a total luminous flux, wherein the diffusion unit and the condensing unit are bonded so as to form a spaced part, and wherein the light diffusion member has a bead structure. ### Claim 17 (depends on 16) The lighting device of claim 16, wherein the light diffusion member is fixed by an adhesive material. ### Claim 18 A lighting device, comprising: a light source unit; a diffusion unit for diffusing light emitted from the light source unit; and a condensing unit on a light emitting surface of the diffusion unit; wherein the condensing unit includes a first concave part on a first surface facing the light emitting surface of the diffusion unit, wherein the condensing unit includes a plurality of lenses on a second surface opposite to the first surface, and wherein the plurality of lenses has a sag determined based on any one of a light emitting area and a total luminous flux. ### Claim 19 (depends on 18) The lighting device of claim 18, wherein the diffusion unit includes a second concave part on the light emitting surface.