# US 2014/0191653 A1 · Protective diffusive coating for led lamp > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2014/0191653 A1 - Document ID: US20140191653A1 - Status: Published application - Kind: A1 - Application number: 13/951,206 - Filed: 2013-07-25 - Published: 2014-07-10 - Earliest claimed: 2013-01-10 - Assignees: Cree, Inc. - Applicants: Cree, Inc. - Inventors: Mark Edmond; Shaow B. Lin; Gerald H. Negley; Paul Kenneth Pickard - Web page: https://patentgrep.com/patent/US20140191653A1 ## CPC - H05B 33/22: characterised by the chemical or physical composition or the arrangement of auxiliary dielectric or reflective layers - F21K 9/232: specially adapted for generating an essentially omnidirectional light distribution, e.g. with a glass bulb - F21V 3/12: the coatings comprising photoluminescent substances - F21V 25/02: coming into action when lighting device is disturbed, dismounted, or broken - G02B 5/206: {comprising particles embedded in a solid matrix} - H10H 20/852: Encapsulations - F21K 9/64: using wavelength conversion means distinct or spaced from the light-generating element, e.g. a remote phosphor layer - H05B: ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL - 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 - G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS - H10H: INORGANIC LIGHT-EMITTING SEMICONDUCTOR DEVICES HAVING POTENTIAL BARRIERS ## Abstract The present disclosure discloses LED lamps and enclosures comprising light transparent polymer coatings comprising light diffusing particles as well as methods for providing improved luminous intensity distribution. More particularly, the present disclosure relates to enclosures comprising light-transparent polymer coatings comprising a light diffusing particles on at least one surfaces of the enclosure of an LED lamp. ## Claims ### Claim 1 An LED lamp comprising: an enclosure about one or more LEDs, the enclosure comprising an interior surface separated from an exterior surface by a thickness, the enclosure comprising deposited on the exterior surface a light-transparent coating comprising light-diffusing particles. ### Claim 2 (depends on 1) The LED lamp of claim 1, wherein the light-diffusing particles has an average particle size distribution between 1 micron and 25 micron. ### Claim 3 (depends on 1) The LED lamp of claim 1, wherein the light-transparent coating comprises a polymer matrix having a first index of refraction and the light-diffusing particles having a second index of refraction differing from the first index of refraction by about 0.3 to about 0.01. ### Claim 4 (canceled) ### Claim 5 (depends on 1) The LED lamp of claim 1, wherein the light-diffusing particles is silica, ground silica fused silica, fumed silica, precipitated silica, or chemically treated silica. ### Claim 6 (depends on 1) The LED lamp of claim 1, wherein the light-diffusing particles are present between 0.1 to 15 weight percent. ### Claim 7 (depends on 1) The LED lamp of claim 1, wherein the interior surface of the enclosure comprises a diffuse surface. ### Claim 8 (depends on 1) The LED lamp of claim 1, wherein the interior surface of the enclosure comprises a diffuse coating, the diffuse coating being the same or different as the light-transmitting coating. ### Claim 9 (depends on 1) The LED lamp of claim 1, wherein the interior surface of the enclosure is etched or sandblasted to a surface roughness capable of diffusing light emitted by the one or more LEDs. ### Claim 10 (depends on 1) The LED lamp of claim 1, wherein the thickness of the enclosure is between about 0.4 millimeters and about 1.5 millimeters. ### Claim 11 (depends on 1) The LED lamp of claim 1, wherein the light-transparent coating is of a thickness between 0.7 mm to about 1 mm. ### Claim 12 (depends on 1) The LED lamp of claim 1, wherein the thickness of the enclosure comprises one or more light filtering agents. ### Claim 13 (depends on 12) The LED lamp of claim 12, wherein the light filtering agents are one or more lanthanide elements or lanthanide compounds deposited on the interior surface or the exterior surface of the enclosure, or doped into the enclosure. ### Claim 14 (depends on 12) The LED lamp of claim 12, wherein the one or more light filtering agents are present in an amount sufficient to absorb at least a portion of the light emitted by the one or more LEDs. ### Claim 15 (depends on 1) The LED lamp of claim 1, wherein the light-transparent coating comprises a polysiloxane or polyurethane. ### Claim 16 (depends on 15) The LED lamp of claim 15, wherein the polysiloxane is a cured, elastomeric polysiloxane or the polyurethane is an elastomeric polyurethane. ### Claim 17 (depends on 1) The LED lamp of claim 1, wherein the light-transparent coating is of a thickness between 1 micron 1000 micron. ### Claim 18 (depends on 1) The LED lamp of claim 1, wherein the light-transparent coating is of a thickness between 100 micron to 500 micron. ### Claim 19 (depends on 1) The LED lamp of claim 1, wherein the light-transparent coating is of a thickness between 150 micron to 300 micron. ### Claim 20 (depends on 1) The LED lamp of claim 1, wherein the light-transparent coating is at least selectively absorbing of a portion of light having one or more wavelengths between about 350 nm to about 850 nm. ### Claim 21 (depends on 1) The LED lamp of claim 1, wherein the light-transparent coating is transparent to light between about 350 nm to about 850 nm. ### Claim 22 (depends on 1) The LED lamp of claim 1, wherein the LED lamp further comprises one or more phosphors. ### Claim 23 (depends on 1) The LED lamp of claim 1, wherein the enclosure is frangible. ### Claim 24 An LED lamp comprising: an enclosure about one or more LEDs, the enclosure comprising: a diffuse interior surface capable of diffracting light emitted from the one or more LEDs; an exterior surface separated from the diffuse interior surface by a thickness; and a light-transparent coating deposited on the exterior surface, the light-transparent coating comprising light-diffusing particles. ### Claim 25 An LED lamp comprising: an enclosure about one or more LEDs, the enclosure comprising: an interior surface; an exterior surface separated from the interior surface by a thickness, the thickness comprising one or more lanthanide compounds and/or lanthanide elements; and a light-transparent coating deposited on the exterior surface, the light-transparent coating comprising light-diffusing particles. ### Claim 26 An LED lamp comprising: an enclosure about one or more LEDs, the enclosure comprising: a diffuse interior surface capable of diffracting light emitted from the one or more LEDs; an exterior surface separated from the interior surface by a thickness, the thickness comprising one or more lanthanide compounds and/or lanthanide elements; and a light-transparent coating deposited on the exterior surface, the light-transparent coating comprising light-diffusing particles. ### Claim 27 An LED lamp comprising: an enclosure about one or more LEDs, the enclosure comprising: an interior diffuse surface; and an exterior diffuse surface separated from the interior surface. ### Claim 28 (depends on 27) The LED lamp of claim 27, wherein the thickness is in the range of 0.4 millimeters to 1.7 millimeters. ### Claim 29 (depends on 27) The LED lamp of claim 27, wherein the thickness is 0.7 to 1 mm. ### Claim 30 (depends on 27) The LED lamp of claim 27, wherein the interior surface is diffuse. ### Claim 31 (depends on 27) The LED lamp of claim 27, wherein the exterior surface is coated with a light-transparent polymer matrix comprising light-diffusing particles comprising a different refractive index than the light-transparent polymer matrix. ### Claim 32 (depends on 27) The LED lamp of claim 27, wherein the enclosure is glass. ### Claim 33 (depends on 27) The LED lamp of claim 27, wherein the enclosure comprises a light filtering agent. ### Claim 34 (depends on 33) The LED lamp of claim 33, wherein the light filtering agent comprises one or more light filtering. ### Claim 35 (depends on 33) The LED lamp of claim 33 at, wherein the light filtering agent comprises neodymium. ### Claim 36 A method of providing improved luminous intensity distribution of a light emitting diode (LED) lamp, the method comprising: coating an enclosure surrounding the one or more LEDs, the enclosure having an interior surface separated from an exterior surface by a thickness, the coating comprising light-diffusing particles in an amount sufficient to diffuse light emitted by the one or more LEDs; and providing a normalized luminous intensity of 0.75 to 1.25 maintained over the range of 0 to 135 degrees of angle of measurement. ### Claim 37 (depends on 36) The method of claim 36, wherein the coating comprises a light-transparent polymer matrix. ### Claim 38 (depends on 36) The method of claim 36, wherein the light-transparent polymer matrix is one or more polysiloxanes or polyurethanes. ### Claim 39 (depends on 36) The method of claim 36, wherein the interior surface of the enclosure comprises a diffuse coating. ### Claim 40 (depends on 36) The method of claim 36, wherein the thickness of the enclosure comprises a light filtering agent. ### Claim 41 (depends on 36) The method of claim 36, wherein the light filtering agent comprises one or more lanthanide compounds or lanthanide elements. ### Claim 42 (depends on 36) The method of claim 36, wherein the enclosure further comprises one or more lanthanide compounds or lanthanide elements deposited on the interior surface or the exterior surface of the enclosure. ### Claim 43 (depends on 36) The method of claim 36, wherein the LED lamp further comprises one or more phosphors. ### Claim 44 (depends on 36) The method of claim 36, wherein the light-diffusing particles silica, ground silica fused silica, fumed silica, precipitated silica, or chemically treated silica. ### Claim 45 (depends on 44) The method of claim 44, wherein the silicate is of an average particle size between 1 and 100 micron. ### Claim 46 (depends on 36) The method of claim 36, wherein the diffusing material is present between 0.1 to about 15 weight percent. ### Claim 47 (depends on 36) The method of claim 36, wherein the coating is of a thickness between 1 micron 1000 micron. ### Claim 48 (depends on 36) The method of claim 36, wherein the thickness is between about 0.4 millimeters and about 1.7 millimeters. ### Claim 49 (depends on 36) The method of claim 36, wherein the thickness comprises one or more lanthanide elements or lanthanide compounds. ### Claim 50 (depends on 36) The method of claim 36, wherein the one or more lanthanide elements or lanthanide compounds present in an amount sufficient to absorb at least a portion of the light emitted by the one or more LEDs, the method further comprising absorbing at least a portion of the light emitted by the one or more LEDs. ### Claim at position 51 51-59. (canceled) ### Claim 60 A method of providing improved luminous intensity distribution of a light emitting diode (LED) lamp, the method comprising: diffusing light emitted by one or more LEDs capable of emitting light of one or more wavelengths by passing the one or more wavelengths of light through a coating deposited on an exterior surface of an enclosure at least partially surrounding the one or more LEDs, the coating comprising a transparent polymer matrix and an amount of light-diffusing particles; and providing a normalized luminous intensity of between 0.75 to 1.25 maintained over a range of 0 to 135 degrees of angle of measurement. ### Claim 61 (depends on 60) The method of claim 60, further comprising absorbing at least a portion of the light emitted by the one or more LEDs before passage through the coating using one or more lanthanide elements or lanthanide compounds deposited on an interior surface of the enclosure or incorporated within the thickness of the enclosure. ### Claim 62 (depends on 60) The method of claim 60, further comprising diffusing at least a portion of the light emitted by the one or more LEDs before passage through the coating using an etched or frosted interior surface of the enclosure. ### Claim 63 (depends on 60) The method of claim 60, further comprising: diffusing at least a portion of the light emitted by the one or more LEDs before passage through the coating using an etched or frosted interior surface of the enclosure; and absorbing at least a portion of the light emitted by the one or more LEDs before passage through the coating using one or more lanthanide elements or lanthanide compounds deposited on an interior surface of the enclosure or incorporated within the thickness of the enclosure. ### Claim 64 An enclosure for a light emitting diode (LED) lamp, the enclosure comprising: an interior surface and an exterior surface separated by a thickness from the interior surface; and a coating deposited on at least a portion of the enclosure, the coating comprising a light-transparent polymer matrix and an amount of light-diffusing particles distributed or dispersed therein. ### Claim 65 (depends on 63) The enclosure of claim 63, wherein the thickness comprises one or more lanthanide elements or lanthanide compounds incorporated therein. ### Claim 66 (depends on 63) The enclosure of claim 63, wherein one or more lanthanide elements or lanthanide compounds are deposited on the interior surface. ### Claim 67 (depends on 63) The enclosure of claim 63, wherein the interior surface is diffuse. ### Claim 68 (depends on 63) The enclosure of claim 63, comprising one or more lanthanide elements or lanthanide compounds incorporated therein and wherein the interior surface is diffuse. ### Claim 69 (depends on 63) The enclosure of claim 63, comprising one or more lanthanide elements or lanthanide compounds deposited on the interior surface and wherein the interior surface is diffuse.