# US 9,518,705 B2 · Lens and an illumination device having the lens > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,518,705 B2 - Document ID: US9518705B2 - Status: Granted - Kind: B2 - Application number: 14/371,741 - Filed: 2013-01-03 - Published: 2015-02-12 - Granted: 2016-12-13 - Earliest claimed: 2012-01-11 - Applicants: OSRAM GmbH - Inventors: Qihui Zhang; HongWei Zhang; Yuhua Liang; Hui Gui - Web page: https://patentgrep.com/patent/US9518705B2 ## CPC - F21K 9/23: Retrofit light sources for lighting devices with a single fitting for each light source, e.g. for substitution of incandescent lamps with bayonet or threaded fittings - F21V 5/046: {the lens having a rotationally symmetrical shape about an axis for transmitting light in a direction mainly perpendicular to this axis, e.g. ring or annular lens with light source disposed inside the ring} - F21V 13/04: the elements being reflectors and refractors {(for vehicle rear lights F21S43/40)} - F21V 29/70: characterised by passive heat-dissipating elements, e.g. heat-sinks - F21Y 2105/10: comprising a two-dimensional [2D] array of point-like light-generating elements - F21Y 2115/10: Light-emitting diodes [LED] - 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 lens for an illumination device, in a cross section, includes a bottom surface, and a first side surface and a second side surface which respectively extend inclinedly upwards from two sides of the bottom surface and converge. The bottom surface includes a supporting surface and an incident surface, the incident surface defining an accommodation cavity for accommodating a light source of the illumination device. The first side surface includes a first emergent surface and a first reflective surface, the second side surface includes a second emergent surface. A first part of light from the incident surface emerges from the first emergent surface, and a second part of light from the incident surface at least emerges from the second emergent surface after reflected by the first reflective surface, such that the emergent light is distributed at an angle of 360°. ## Claims ### Claim 1 A lens for an illumination device, in a cross section, the lens comprising: a bottom surface; and a first side surface and a second side surface which respectively extend inclinedly upwards from two sides of the bottom surface and converge, wherein the bottom surface comprises a supporting surface and an incident surface, the incident surface defining an accommodation cavity for accommodating a light source of the illumination device, wherein the first side surface comprises a first emergent surface and a first reflective surface, the second side surface comprises a second emergent surface, wherein a first part of light from the incident surface emerges from the first emergent surface, and a second part of light from the incident surface at least emerges from the second emergent surface after reflected by the first reflective surface, such that the emergent light is distributed at an angle of 360°. ### Claim 2 (depends on 1) The lens according to claim 1, wherein the lens is configured to be a ring shape, and is rotationally symmetrical with respect to an axis which is perpendicular to the bottom surface. ### Claim 3 (depends on 2) The lens according to claim 2, wherein the second side surface further comprises a second reflective surface, the second part of light from the incident surface at least partially emerges from the second emergent surface after reflected by the second reflective surface and the first reflective surface in sequence. ### Claim 4 An illumination device comprising a lens the lens comprising: a bottom surface; and a first side surface and a second side surface which respectively extend inclinedly upwards from two sides of the bottom surface and converge, wherein the bottom surface comprises a supporting surface and an incident surface, the incident surface defining an accommodation cavity for accommodating a light source of the illumination device, wherein the first side surface comprises a first emergent surface and a first reflective surface, the second side surface comprises a second emergent surface, wherein a first part of light from the incident surface emerges from the first emergent surface, and a second part of light from the incident surface at least emerges from the second emergent surface after reflected by the first reflective surface, such that the emergent light is distributed at an angle of 360°, wherein the supporting surface of the lens is supported on the other side of the heat sink, and the second side surface of the lens is arranged such that a projection of the second side surface on the other side of the heat sink does not overlap a projection of the heat sink. ### Claim 5 (depends on 4) The illumination device according to claim 4, wherein the illumination device further comprises: a heat sink, an electronic assembly provided at one side of the heat sink, an LED light-emitting assembly provided at the other side of the heat sink, and a transparent bulb which defines, together with the other side of the heat sink, an accommodation space. ### Claim 6 (depends on 5) The illumination device according to claim 5, wherein the LED light-emitting assembly comprises a printed circuit board and a plurality of LED chips which are uniformly arranged in a ring shape in the vicinity of a circumferential edge of the printed circuit board. ### Claim 7 (depends on 5) The illumination device according to claim 5, wherein the lens is fully enclosed in the accommodation space. ### Claim 8 A lens for an illumination device, in a cross section, the lens comprising: a bottom surface; and a first side surface and a second side surface which respectively extend inclinedly upwards from two sides of the bottom surface and converge, wherein the bottom surface comprises a supporting surface and an incident surface, the incident surface defining an accommodation cavity for accommodating a light source of the illumination device, wherein the first side surface comprises a first emergent surface and a first reflective surface, the second side surface comprises a second emergent surface, wherein a first part of light from the incident surface emerges from the first emergent surface, and a second part of light from the incident surface at least emerges from the second emergent surface after reflected by the first reflective surface, such that the emergent light is distributed at an angle of 360°, wherein the lens is configured to be a ring shape, and is rotationally symmetrical with respect to an axis which is perpendicular to the bottom surface, wherein the second side surface further comprises a second reflective surface, the second part of light from the incident surface at least partially emerges from the second emergent surface after reflected by the second reflective surface and the first reflective surface in sequence, wherein the incident surface comprises a first incident surface portion, a second incident surface portion, and a third incident surface portion, wherein a first part of light from the light source incidents into the first incident surface portion and emerges after refracted by the first emergent surface, and one part of a second part of light from the light source incidents into the second incident surface portion and emerges from the second emergent surface after reflected by the first reflective surface, and the other part of the second part of light from the light source incidents into the third incident surface portion and emerges from the second emergent surface after reflected by the second reflective surface and the first reflective surface in sequence. ### Claim 9 (depends on 8) The lens according to claim 8, wherein a side of the first reflective surface is connected with the second reflective surface via the second emergent surface, wherein the first reflective surface and the second reflective surface are arranged to partially face each other. ### Claim 10 (depends on 9) The lens according to claim 9, wherein the first reflective surface is connected with the supporting surface via the first emergent surface, the supporting surface is connected with the second incident surface portion via the first incident surface portion, and the second incident surface portion is connected with the second reflective surface via the third incident surface portion. ### Claim 11 (depends on 9) The lens according to claim 9, wherein in the cross section, the second reflective surface is arranged to be inclined with respect to the axis, and forms an angle with the third incident surface portion, wherein an angle between a tangential direction of the second reflective surface and the bottom surface is greater than 90°. ### Claim 12 (depends on 8) The lens according to claim 8, wherein in the cross section, the first incident surface portion is configured as a concave surface recessed away the light source, and the second incident surface portion is configured as a convex surface projecting towards the light source, wherein the concave surface and the convex surface are in a smooth transition. ### Claim 13 (depends on 8) The lens according to claim 8, wherein in the cross section, the third incident surface portion is in a linear shape and is arranged to be inclined with respect to the axis in a direction apart from the second side surface, wherein an angle between the second incident surface portion and the axis is between 2°-5°. ### Claim 14 (depends on 8) The lens according to claim 8, wherein the first emergent surface, the first reflective surface, the second emergent surface, and the second reflective surface are in a shape of spline curve in the cross section. ### Claim 15 (depends on 8) The lens according to claim 8, wherein the first emergent surface, the first reflective surface, the second emergent surface, and the second reflective surface are in a shape of rational quadric Bezier curve in the cross section. ### Claim 16 (depends on 15) The lens according to claim 15, characterized in that, the rational quadric Bezier curve can be defined by the equation: p ⁡ ( t ) = ( 1 - t ) 2 ⁢ w 0 ⁢ v 0 + 2 ⁢ ⁢ t ⁡ ( 1 - t ) ⁢ w 1 ⁢ v 1 + t 2 ⁢ w 2 ⁢ v 2 ( 1 - t ) 2 ⁢ w 0 + 2 ⁢ ⁢ t ⁡ ( 1 - t ) ⁢ w 2 + t 2 ⁢ w 2 , 0 ≤ t ≤ 1 , where v0, v1, v2 are predetermined control vertexes, and w0, w1, w2 are predefined weights. ### Claim 17 (depends on 8) The lens according to claim 8, wherein the second incident surface portion is in a shape of spline curve, conic, or arc in the cross section. ### Claim 18 (depends on 8) The lens according to claim 8, wherein the first incident surface portion is in an arc-shape which is tangent to the second incident surface portion in the cross section.