# US 2019/0170927 A1 · Indirect luminaire > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2019/0170927 A1 - Document ID: US20190170927A1 - Status: Published application - Kind: A1 - Application number: 16/323,837 - Filed: 2017-08-01 - Published: 2019-06-06 - Earliest claimed: 2016-08-10 - Assignees: Signify Holding B.V. - Applicants: Signify Holding B.V. - Inventors: QIN LI; QUN LUO; KANG LI; ZHENYI ZHENG; MIN CHEN - Web page: https://patentgrep.com/patent/US20190170927A1 ## CPC - G02B 6/0045: {by shaping at least a portion of the light guide} - G02B 6/0001: {specially adapted for lighting devices or systems (lighting or signalling on vehicles using light guides B60Q1/00; lighting devices for vehicle dashboards B60Q3/10; lighting devices for vehicle interior using light guides B60Q3/62; lighting devices mounted on the vehicle rear part using light guides F21S43/235; measuring arrangements having light conducting pointers G01D13/265; illumination of liquid crystal displays G02F1/1336; illuminated signs G09F13/00)} - G02B 6/0055: {Reflecting element, sheet or layer} - G02B 6/0068: {Arrangements of plural sources, e.g. multi-colour light sources} - G02B 6/0088: {of the light guide or other optical sheets in the package} - G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS ## Abstract A luminaire (1) is disclosed comprising at least one optical chamber (10) delimited by a light exit window (11) and a curved reflective surface (15) extending from the light exit window to a mounting surface (17) extending from the curved reflective surface towards the light exit window. Each optical chamber comprises a light source (20) mounted on the mounting surface; and a light guide (30) extending across part of the optical chamber. The light guide comprises a total internal reflection major surface (40) facing the light exit window; a further major surface (50) facing the curved reflective surface, said further major surface comprising a light outcoupling portion (51) comprising a plurality of light outcoupling structures (53); a first edge surface (60) optically coupled to the light source; and a further edge surface (70) opposite the first edge surface arranged to direct light towards the curved reflective surface. ## Claims ### Claim 1 A luminaire comprising: at least one optical chamber delimited by a light exit window and a 5 curved reflective surface extending from the light exit window to a mounting surface extending from the curved reflective surface towards the light exit window, each optical chamber comprising: a light source mounted on the mounting surface; and a light guide extending across part of the optical chamber, comprising: a total internal reflection major surface facing the light exit window; a further major surface facing the curved reflective surface, said further major surface comprising a light outcoupling portion comprising a plurality of light outcoupling structures; a first edge surface optically coupled to the light source; and a further edge surface opposite the first edge surface arranged to direct light towards the curved reflective surface; wherein: the optical chamber has a width (W) defined from a light emission surface of the light source to an end point of the curved reflective surface proximal to the light exit window; the light guide has a length (L) between the first edge surface and the further edge surface; a ratio between the width (W) and the length (L) is in a range of 2:1-5:1; and the light guide is spatially away from the curved reflective surface at a substantial distance (H1) along direction of the mounting surface, wherein the substantial distance (H1) is equal to or larger than thickness of the light guide. ### Claim 2 (depends on 1) The luminaire of claim 1, wherein the further major surface further comprises a total internal reflection portion in between the mounting surface and the light outcoupling portion. ### Claim 3 (depends on 2) The luminaire of claim 2, wherein a ratio of the length (L1) of the light outcoupling portion and the length (L2) of the total internal reflection portion is in a range 1:5-1:30. ### Claim 4 (depends on 1) The luminaire of any claim 1, wherein the light outcoupling structures are prisms such as Fresnel prisms. ### Claim 5 (depends on 4) The luminaire of claim 4, wherein each prism has a width in a range of 1-4 mm and/or a vertex angle in a range of 70-105°. ### Claim 6 (depends on 1) The luminaire of claim 1, wherein the light outcoupling structures are scattering dots. ### Claim 7 (depends on 1) The luminaire of claim 1, wherein the further edge surface 15 comprises a micro lens. ### Claim 8 (depends on 1) The luminaire of claim 1, wherein the further edge surface comprises a freeform surface. ### Claim 9 (depends on 1) The luminaire of claim 1, wherein the further edge surface comprises a slanted surface portion under an angle(θ) in a range of 60-80° with the total internal reflection surface. ### Claim 10 (depends on 9) The luminaire of claim 9, wherein the further edge surface comprises a further 25 slanted surface portion under an angle(α) in a range of 120-160° with the slanted surface portion, the further slanted surface portion extending from the total internal reflection surface and the slanted surface portion extending from the further slanted surface portion to the further major surface. ### Claim 11 (depends on 1) The luminaire of claim 1, wherein: the distance (H1) between the light guide and the curved reflective surface is larger than a distance (H2) between the light guide and the light exit window. ### Claim 12 (depends on 1) The luminaire of claim 1, wherein: the optical chamber has a width (W) defined from a light emission surface of the light source to an end point of the curved reflective surface proximal to the light exit window; the mounting surface has a height (H); and a ratio between the width (W) and the height (H) is in a range of 1:1-5:1. ### Claim 13 (depends on 1) The luminaire of claim 1, wherein the light source is a solid state light source. ### Claim 14 (depends on 1) The luminaire of claim 1, comprising a pair of optical chambers separated by a compartment for housing one or more luminaire components, optionally wherein the optical chambers are mirror images of each other. ### Claim 15 (depends on 1) The luminaire of claim 1, wherein the luminaire is a troffer.