# US 11,442,216 B2 · Lighting device, window with a lighting function, and building product for a window > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,442,216 B2 - Document ID: US11442216B2 - Status: Granted - Kind: B2 - Application number: 17/432,097 - Filed: 2020-02-26 - Published: 2022-06-23 - Granted: 2022-09-13 - Earliest claimed: 2019-02-27 - Assignees: Mitsubishi Electric Corporation - Applicants: Mitsubishi Electric Corporation - Inventors: Yusuke Fujii; Satoru Okagaki - Web page: https://patentgrep.com/patent/US11442216B2 ## CPC - F21V 9/02: for simulating daylight (F21V9/04, F21V9/06 take precedence) - G02B 6/0041: {provided in the bulk of the light guide} - E06B 3/4618: {the sliding wing being arranged beside a fixed wing (E06B3/4627 takes precedence)} - E06B 3/4654: {disappearing in pockets in the wall; Pockets therefor} - E06B 3/5454: {inside U-shaped section members} - F21V 9/40: with provision for controlling spectral properties, e.g. colour, or intensity - F21V 15/01: Housings, e.g. material or assembling of housing parts (F21V15/02 takes precedence {housings forming signs or letters G09F13/04}) - G02B 5/0242: {by means of dispersed particles} - G02B 6/0063: {for extracting light out both the major surfaces of the light guide} - F21Y 2103/10: comprising a linear array of point-like light-generating elements - F21Y 2113/13: comprising an assembly of point-like 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 - G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS - E06B: FIXED OR MOVABLE CLOSURES FOR OPENINGS IN BUILDINGS, VEHICLES, FENCES OR LIKE ENCLOSURES IN GENERAL, e.g. DOORS, WINDOWS, BLINDS, GATES (shades or blinds for greenhouses A01G9/22; curtains A47H; lids for car boots or bonnets B62D25/10; skylights E04B7/18; sunshades, awnings E04F10/00) - 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 lighting device includes a first light source to emit first light; a diffuser to receive the first light and emits first scattered light; and a frame to support the first light source and the diffuser. The diffuser includes nanoparticles, and guides the received first light, scatters it with the nanoparticles, and emits it as the first scattered light. The diffuser includes an incident surface to receive the first light, a first surface on which an emission surface to emit the first scattered light is formed, and a second surface opposite the first surface. The incident surface is at a first edge portion of the diffuser, the frame is opened to expose at least a portion of a region on the first surface of the diffuser in which the emission surface is formed and a region on the second surface corresponding thereto. ## Claims ### Claim 1 A lighting device comprising: a first light source to emit first light; a diffuser to receive the first light and emit scattered light; and a frame to support the first light source and the diffuser, wherein the diffuser includes nanoparticles, and guides the received first light, scatters the first light with the nanoparticles, and emits the first light as the scattered light, the diffuser includes a light incident surface to receive the first light, a first surface on which a first light emission surface to emit the scattered light is formed, and a second surface opposite the first surface, the light incident surface is formed at a first edge portion of the diffuser, the frame is opened to expose at least a portion of a region on the first surface of the diffuser in which the first light emission surface is formed and a region on the second surface corresponding thereto, and a correlated color temperature of the scattered light is higher than a correlated color temperature of the first light. ### Claim 2 (depends on 1) The lighting device of claim 1, wherein a haze of the diffuser in a thickness direction that is a normal direction of the first surface is not less than 0.1% and not more than 15%. ### Claim 3 (depends on 1) The lighting device of claim 1, wherein the first light emission surface is formed on at least one surface connected to the first edge portion and a second edge portion at which the first light received through the light incident surface is guided and arrives. ### Claim 4 (depends on 1) The lighting device of claim 1, wherein the lighting device includes, as the first light source, a plurality of light sources to emit lights having at least two different color temperatures. ### Claim 5 (depends on 1) The lighting device of claim 1, wherein the frame is constituted by two or more separable structural bodies. ### Claim 6 (depends on 5) The lighting device of claim 5, wherein the frame includes a first frame portion and a second frame portion that are separable from each other, the first frame portion supports the diffuser, and the second frame portion supports the first light source. ### Claim 7 (depends on 5) The lighting device of claim 5, wherein the frame includes a first frame portion and a second frame portion that are separable from each other, the first frame portion supports the diffuser and the first light source, the second frame portion supports the first frame portion in an installed state, and includes a power feeder to supply electrical power to the first light source, and the first frame portion includes a power receiver to receive the electrical power supplied from the power feeder. ### Claim 8 (depends on 1) The lighting device of claim 1, wherein a back plate that is an opaque structural body is provided on a second surface side of the diffuser in an openable and closable manner. ### Claim 9 (depends on 1) The lighting device of claim 1, wherein a sunlight reproducer including a light emitting surface to reproduce sunlight is provided on a first surface side of the diffuser. ### Claim 10 (depends on 9) The lighting device of claim 9, wherein a second light source is provided between the sunlight reproducer and the diffuser. ### Claim 11 (depends on 1) The lighting device of claim 1, wherein a deflector to change a traveling direction of the first light is provided in at least one edge surface of the diffuser or an inner surface of the frame facing the edge surface. ### Claim 12 (depends on 1) The lighting device of claim 1, wherein a light shield to block external light is provided on at least one of a first surface side and a second surface side of the diffuser. ### Claim 13 (depends on 1) The lighting device of claim 1, wherein the frame supports the diffuser in an openable and closable manner. ### Claim 14 (depends on 1) The lighting device of claim 1, wherein the diffuser includes a second light emission surface disposed opposite the light incident surface, the second light emission surface emitting light guided in the diffuser, and the lighting device further comprises a light extractor to deflect the light emitted through the second light emission surface, toward a space facing the first light emission surface. ### Claim 15 (depends on 1) The lighting device of claim 1, wherein the diffuser includes two or more regions having different particle concentrations. ### Claim 16 (depends on 15) The lighting device of claim 15, wherein the diffuser includes, at an edge portion other than an edge portion at which the light incident surface is provided, a region having a smaller particle concentration than another region. ### Claim 17 A window with a lighting function used as a window of a building or a mobile body, the window comprising: a diffuser to receive first light and emit scattered light; and a frame to support the diffuser, wherein the diffuser includes nanoparticles, and guides the received first light, scatters the first light with the nanoparticles, and emits the first light as the scattered light, the diffuser includes a light incident surface to receive the first light, a first surface on which a first light emission surface to emit the scattered light is formed, and a second surface opposite the first surface, the light incident surface is formed at a first edge portion of the diffuser, the frame is opened to expose at least a portion of a region on the first surface of the diffuser in which the first light emission surface is formed and a region on the second surface corresponding thereto, and a correlated color temperature of the scattered light is higher than a correlated color temperature of the first light. ### Claim 18 (depends on 17) The window with the lighting function of claim 17, further comprising a first light source to emit the first light, wherein the frame supports the first light source and the diffuser. ### Claim 19 A building product for a window comprising: a first light source to emit first light; a diffuser to receive the first light and emit scattered light; and a frame to support the first light source and the diffuser, wherein the diffuser includes nanoparticles, and guides the received first light, scatters the first light with the nanoparticles, and emits the first light as the scattered light, the diffuser includes a light incident surface to receive the first light, a first surface on which a first light emission surface to emit the scattered light is formed, and a second surface opposite the first surface, the light incident surface is formed at a first edge portion of the diffuser, the frame is opened to expose at least a portion of a region on the first surface of the diffuser in which the first light emission surface is formed and a region on the second surface corresponding thereto, and a correlated color temperature of the scattered light is higher than a correlated color temperature of the first light.