# US 10,119,676 B2 · Lighting device, corresponding lamp and method > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,119,676 B2 - Document ID: US10119676B2 - Status: Granted - Kind: B2 - Application number: 15/250,988 - Filed: 2016-08-30 - Published: 2017-12-14 - Granted: 2018-11-06 - Earliest claimed: 2016-06-10 - Assignees: OSRAM GmbH - Applicants: OSRAM GmbH - Inventors: Nicola Schiccheri; Alessandro Bizzotto; Marco Munarin - Web page: https://patentgrep.com/patent/US10119676B2 ## CPC - F21S 41/143: the main emission direction of the LED being parallel to the optical axis of the illuminating device - F21K 9/61: using light guides - F21S 41/24: Light guides - F21S 41/32: Optical layout thereof - F21S 41/322: {the reflector using total internal reflection} - F21V 5/04: of lens shape - F21V 5/10: comprising photoluminescent material - F21V 7/0033: {with successive reflections from one reflector to the next or following} - F21V 7/0091: {using total internal reflection} - F21V 7/041: {with conical or pyramidal surface} - F21V 9/08: for producing coloured light, e.g. monochromatic; for reducing intensity of light (with provision for controlling the colour F21V9/40) - F21V 7/0008: {providing for indirect lighting} - F21Y 2115/10: Light-emitting diodes [LED] - F21S: NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS - F21K: NON-ELECTRIC LIGHT SOURCES USING LUMINESCENCE; LIGHT SOURCES USING ELECTROCHEMILUMINESCENCE; LIGHT SOURCES USING CHARGES OF COMBUSTIBLE MATERIAL; LIGHT SOURCES USING SEMICONDUCTOR DEVICES AS LIGHT-GENERATING ELEMENTS; LIGHT SOURCES NOT OTHERWISE PROVIDED FOR - F21V: FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR - 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, which may be used e.g. to produce motor vehicle lamps, may include a light radiation source, e.g. a LED source, having a light-permeable body arranged facing source for propagating light radiation along a longitudinal axis. The light-permeable body includes a collimator exposed to light radiation source and adapted to collect light radiation and to inject it into light-permeable body, a tapered portion coupled to collimator for receiving light radiation and directing it towards an output end, a distal portion acting as an emission filament, coupled to the output end of tapered portion, with an output mirror having a shank portion extending in said distal portion and a head portion, the output mirror reflecting light radiation radially from longitudinal axis and proximally towards said light radiation source. ## Claims ### Claim 1 A lighting device, comprising: an electrically-powered light radiation source, a light-permeable body having a longitudinal axis arranged facing said light radiation source for propagating light radiation from said source distally of the light radiation source along said longitudinal axis, the light-permeable body comprising: a collimator exposed to said light radiation source for collecting light radiation from said light radiation source and injecting it into said light-permeable body, a portion tapered from an input end towards an output end, the input end of said tapered portion coupled to said collimator for receiving light radiation collimated thereby and directing said collimated radiation towards said output end, and a distal portion coupled to the output end of said tapered portion, the device further comprising an output mirror with a shank portion extending in said distal portion and a head portion, said output mirror reflecting light radiation radially from said longitudinal axis and proximally towards said light radiation source; wherein the shank portion extending in the distal portion of said output mirror has a layered dichroic filter structure; wherein said layered dichroic filter structure includes a first and a second layer, said first layer having a dichroic filtering surface, wherein light radiation is partially reflected from said first surface and partially propagates through said first layer towards said second layer to be reflected from said second layer. ### Claim 2 (depends on 1) The lighting device of claim 1, wherein said collimator comprises: a lenticular surface exposed to said light radiation source to collect light radiation emitted by said light radiation source within a certain solid angle, and an outer surface around said lenticular surface to reflect light radiation emitted by said light radiation source outside said solid angle. ### Claim 3 (depends on 2) The lighting device of claim 2, wherein said collimator includes a proximal cavity facing said light radiation source, said cavity having a peripheral wall surrounding a bottom wall, said bottom surface including said lenticular surface. ### Claim 4 (depends on 1) The lighting device of claim 1, wherein said collimator and/or said tapered portion and/or said distal portion have symmetry of revolution around said longitudinal axis. ### Claim 5 (depends on 1) The lighting device of claim 1, wherein said distal portion is filament-like. ### Claim 6 (depends on 1) The lighting device of claim 1, wherein said output mirror, is specularly reflective and/or is diffusively reflective and/or is partly specularly reflective and partly diffusively reflective. ### Claim 7 (depends on 1) The lighting device of claim 1, wherein said light radiation source includes a LED source. ### Claim 8 A lamp comprising: a lighting device, said lighting device, comprising: an electrically-powered light radiation source, a light-permeable body having a longitudinal axis arranged facing said light radiation source for propagating light radiation from said source distally of the light radiation source along said longitudinal axis, the light-permeable body comprising: a collimator exposed to said light radiation source for collecting light radiation from said light radiation source and injecting it into said light-permeable body, a portion tapered from an input end towards an output end, the input end of said tapered portion coupled to said collimator for receiving light radiation collimated thereby and directing said collimated radiation towards said output end, and a distal portion coupled to the output end of said tapered portion, the device further comprising an output mirror with a shank portion extending in said distal portion and a head portion, said output mirror reflecting light radiation radially from said longitudinal axis and proximally towards said light radiation source, wherein the shank portion extending in the distal portion of said output mirror has a layered dichroic filter structure; wherein said layered dichroic filter structure includes a first and a second layer, said first layer having a dichroic filtering surface, wherein light radiation is partially reflected from said first surface and partially propagates through said first layer towards said second layer to be reflected from said second layer; and a casing for said lighting device, said casing including at least one light-permeable portion for emitting light radiation from said lighting device. ### Claim 9 A method of providing a lighting device, the method comprising: providing an electrically-powered light radiation source, arranging facing said light radiation source a light-permeable body having a longitudinal axis for propagating light radiation from said source distally of the light radiation source along said longitudinal axis, the light-permeable body comprising: a collimator exposed to said light radiation source for collecting light radiation from said light radiation source and injecting it into said light-permeable body, a portion tapered from an input end towards an output end, the input end of said tapered portion coupled to said collimator for receiving light radiation collimated thereby and directing said collimated radiation towards said output end, and a distal portion coupled to the output end of said tapered portion, providing an output mirror with a shank portion extending in said distal portion and a head portion, said output mirror reflecting light radiation radially from said longitudinal axis and proximally towards said light radiation source; wherein the shank portion extending in the distal portion of said output mirror has a layered dichroic filter structure; wherein said layered dichroic filter structure includes a first and a second layer, said first layer having a dichroic filtering surface, wherein light radiation is partially reflected from said first surface and partially propagates through said first layer towards said second layer to be reflected from said second layer.