# US 9,039,252 B2 · Lens for asymmetrical light beam generation > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,039,252 B2 - Document ID: US9039252B2 - Status: Granted - Kind: B2 - Application number: 13/500,101 - Filed: 2010-09-29 - Published: 2012-08-02 - Granted: 2015-05-26 - Earliest claimed: 2009-10-08 - Assignees: Koninklijkle Philips N.V. - Applicants: Vincent Treanton - Inventors: Vincent Treanton - Web page: https://patentgrep.com/patent/US9039252B2 ## CPC - F21S 8/086: {with lighting device attached sideways of the standard, e.g. for roads and highways} - F21V 5/04: of lens shape - F21V 5/08: producing an asymmetric light distribution - G02B 19/0028: {refractive and reflective surfaces, e.g. non-imaging catadioptric systems} - G02B 19/0061: {the light source comprising a LED} - F21W 2131/103: of streets or roads - F21Y 2115/10: Light-emitting diodes [LED] - F21S: NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS - 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 - F21W: INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO USES OR APPLICATIONS OF LIGHTING DEVICES OR SYSTEMS - 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 The invention relates to an optical device for imparting an asymmetrical light beam. The optical device comprises a lens (10) having an exit diopter (12) having an exit surface consisting of a convex surface (16) defining a curved rear portion (18) having a first curvature and a curved front portion (19) having a second curvature different from the first curvature. Furthermore the lens (10) comprises an entry diopter (11) including at least one concave lodging (13) for lodging at least one light source, the surface of the concave lodging (13) facing at least partly the curved rear portion (18). ## Claims ### Claim 1 An optical device for imparting an asymmetrical light beam, said optical device comprising a lens having: an exit diopter which comprises an exit surface consisting of a convex surface defining a curved rear portion having a first curvature and a curved front portion having a second curvature different from the first curvature; an entry diopter including at least one concave lodging for lodging at least one light source, the surface of the concave lodging facing at least partly the curved rear portion; wherein the lens is arranged such that at least 50% of the light emitted directly by the light source(s) is reflected without reflectors or reflective coatings by total internal reflection on the curved rear portion and at least 50% of the light reflected on surfaces of the lens and directly emitted by the light source(s) is transmitted through the front portion. ### Claim 2 (depends on 1) The optical device of claim 1, wherein a planar base surface joins the concave lodging to the rear portion and front portion of the exit diopter. ### Claim 3 (depends on 1) The optical device of claim 1, wherein the curved rear portion has a profile that provide an internal reflection of at least 75% of light rays coming directly from the light source and a front part that transmit at least 90% of light rays coming directly from the light source and reflected light rays. ### Claim 4 (depends on 1) The optical device of claim 1, wherein the lodging is positioned at ¼ of the distance between the rear portion and the front portion of said lens. ### Claim 5 (depends on 1) The optical device of claim 1, wherein each concave lodging has an axis of symmetry. ### Claim 6 (depends on 5) The optical device of claim 5, wherein each concave lodging is a portion of a sphere. ### Claim 7 (depends on 5) The optical device of claim 5, wherein each concave lodging is a portion of a sphere cut off by a plane at a distance comprised between 0.1*r and 0.8*r from the center of the sphere, wherein r is the radius of the sphere. ### Claim 8 (depends on 1) The optical device of claim 1, wherein a profile of the rear portion in a plane is described by a first polynomial equation of at least degree 3, and a profile of the front portion in the same plane is described by a second polynomial equation of at least degree 5, wherein the x and y parameters of the polynomial equations are defined from an x-axis and an y-axis perpendicular to each other and lying within the plane. ### Claim 9 (depends on 8) The optical device according to claim 8, wherein said plane is a sagittal plane of the lens. ### Claim 10 (depends on 2) The optical device according to claim 2, wherein the surfaces of the rear portion and/or the front portion are rotationally constructed around an axis defined as the intersection between said plane and the planar base surface, in a Cartesian orthonormal coordinate system wherein x-axis and y-axis lie within the sagittal plane of the lens. ### Claim 11 (depends on 1) The optical device according to claim 1, wherein the distal part of the front portion from the rear portion is a planar face perpendicular to the base plane surface. ### Claim 12 (depends on 9) The optical device according to claim 9, wherein the lens is arranged such that output beams are parallel to each other in the sagittal plane. ### Claim 13 (depends on 8) The optical device of claim 8, wherein the first polynomial equation is: y=−0.61x4−7.74x3−36.47x2−74.40x−49, and the second polynomial equation is: y=−3E−05x6+0.0009x5×0.0086x4+0.0242x3−0.0307x2+0.5574x+8.2846, wherein the origin of x-axis and y-axis is the geometric center of the light source(s). ### Claim 14 An optical device for imparting an asymmetrical light beam, comprising a lens: an exit diopter of the lens having a convex exit surface defining a curved rear portion with a first curvature and a curved front portion having a second curvature different from the first curvature; an entry diopter including at least one concave lodging for lodging at least one light source, the surface of the concave lodging facing at least partly the curved rear portion; wherein the lens is arranged for total internal reflection such that at least 75% of the light emitted directly by the light source is reflected on the curved rear portion without reflectors or reflective coatings and at least 90% of the light reflected on surfaces of the lens and directly emitted by the light source is transmitted through the front portion; and wherein each of the at least one concave lodging is a portion of a sphere cut off by a plane at a distance comprised between 0.1*r and 0.8*r from the center of the sphere, wherein r is the radius of the sphere. ### Claim 15 An optical device for imparting an asymmetrical light beam, comprising a lens: an exit diopter of the lens having a convex exit surface defining a curved rear portion with a first curvature and a curved front portion having a second curvature different from the first curvature; an entry diopter including at least one concave lodging for lodging at least one light source, the surface of the concave lodging facing at least partly the curved rear portion; wherein the lens is arranged for total internal reflection such that at least 75% of the light emitted directly by the light source is reflected on the curved rear portion without reflectors and at least 90% of the light reflected on surfaces of the lens and directly emitted by the light source is transmitted through the front portion; the concave lodging positioned on a sagittal plane of the optical device and is further positioned about one quarter of the distance between a rear end and a front end of the optical device; the lens arranged such that the light emitted through the front portion is a plurality of light output beams substantially parallel to each other.