# US 2013/0155707 A1 · Anisotropic incandescent light source > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2013/0155707 A1 - Document ID: US20130155707A1 - Status: Published application - Kind: A1 - Application number: 13/327,167 - Filed: 2011-12-15 - Published: 2013-06-20 - Earliest claimed: 2011-12-15 - Inventors: Istvan MUDRA; Laszlo Nagy; Jozsef Gallai - Web page: https://patentgrep.com/patent/US20130155707A1 ## CPC - H01K 1/14: characterised by the shape - H01K: ELECTRIC INCANDESCENT LAMPS (details, apparatus or processes for manufacture applicable to both discharge devices and incandescent lamps H01J; light sources using a combination of incandescent and other types of light generation H01J61/96, H05B35/00) ## Abstract An improved incandescent light source as may be used in a vehicle headlamp for providing forward illumination. The illuminating system includes a filament coil and an anisotropic reflector assembly. The filament coil is constructed from a coil of wire that is electrically conductive and has a high melting point and the primary axis of the coil of wire is substantially aligned with a principal axis of the reflector system. The light flux emitted by the filament coil toward the reflector system is rotationally anisotropic. ## Claims ### Claim 1 An illuminating system, comprising: an anisotropic filament coil comprising a coil of wire that is electrically conductive and that as a longitudinal axis; and an anisotropic reflector assembly having a principal axis, wherein the longitudinal axis of the coil of wire is substantially aligned with the principal axis of the anisotropic reflector assembly, and wherein a light flux emitted by the anisotropic filament coil toward the anisotropic reflector assembly is rotationally anisotropic. ### Claim 2 (depends on 1) The illuminating system of claim 1 wherein the anisotropic reflector assembly comprises an upper quadrant, a lower quadrant, and right quadrant and a left quadrant, and the anisotropic reflector assembly is configured such that the right and left quadrants reflect a greater portion of the flux than the upper and lower quadrants. ### Claim 3 (depends on 2) The illuminating system of claim 2 wherein the anisotropic filament coil emits a greater portion of the flux toward the right and left quadrants than toward the upper and lower quadrants. ### Claim 4 (depends on 3) The illuminating system of claim 3, wherein a cross-section of the coil of wire has a height and a width, the height being greater than the width. ### Claim 5 (depends on 4) The illuminating system of claim 4, wherein a shape of the cross-section of the coil of wire comprises an oval shape. ### Claim 5 (depends on 4) The illuminating system of claim 4, wherein the height of the cross-section of the coil of wire is between about 1.05 and about five times the width of the cross-section of the coil of wire. ### Claim 6 (depends on 4) The illuminating system of claim 4, wherein a shape of the cross-section of the coil of wire comprises a rounded rectangular shape. ### Claim 7 (depends on 3) The illuminating system of claim 3, wherein the coil of wire is a single-coil of wire. ### Claim 8 (depends on 3) The illuminating system of claim 3, wherein the coil of wire is a coiled-coil of wire. ### Claim 9 (depends on 3) The illuminating system of claim 3, wherein the anisotropic reflector assembly further comprises a generally parabolic reflector assembly. ### Claim 10 An incandescent lamp, comprising: an anisotropic filament coil; a substantially transparent envelope enclosing the filament coil, the envelope having a first end and a second end; and a cap fixedly attached to the first end of the envelope, wherein the filament coil comprises a coil of wire that is electrically conductive, and wherein a light flux emitted by the coil of wire is rotationally anisotropic, and the cap is configured to hold the anisotropic filament coil in a fixed orientation such that a longitudinal axis of the coil of wire is substantially aligned with a principal axis of an anisotropic reflector assembly. ### Claim 11 (depends on 10) The incandescent lamp of claim 10, wherein the coil of wire has a height and a width, the height of the cross-section of the coil of wire being greater than the width of the cross-section of the coil of wire, and the longitudinal axis of the coil of wire is substantially aligned with an optical axis of the lamp. ### Claim 12 (depends on 11) The incandescent lamp of claim 11, wherein a shape of the cross-section of the coil of wire comprises an oval shape. ### Claim 13 (depends on 11) The incandescent lamp of claim 11, wherein a shape of the cross-section of the coil of wire comprises a rounded rectangular shape. ### Claim 14 (depends on 11) The incandescent lamp of claim 11, wherein the height of the cross-section of the coil of wire is between about 11.05 and about five times the width of the cross-section of the coil of wire. ### Claim 15 (depends on 11) The incandescent lamp of claim 11, wherein the filament coil comprises a single-coil of wire. ### Claim 16 (depends on 11) The incandescent lamp of claim 11, wherein the filament coil comprises a coiled-coil of wire. ### Claim 17 (depends on 11) The incandescent lamp of claim 11, wherein the anisotropic reflector assembly comprises a generally parabolic reflector assembly. ### Claim 18 An automotive headlamp assembly, the assembly comprising: an incandescent lamp; an anisotropic reflector assembly having a principal axis; and a housing, wherein the lamp comprises: an anisotropic filament coil; a substantially transparent envelope enclosing the filament coil, the envelope having a first end and a second end; and a cap fixedly attached to the first end of the envelope, wherein the anisotropic filament coil comprises a coil of wire that is electrically conductive, and wherein a light flux emitted by the coil of wire toward the anisotropic reflector assembly is rotationally anisotropic, and wherein the cap is removably coupled to the housing and configured to hold the anisotropic filament coil in a fixed orientation within the anisotropic reflector assembly such that longitudinal axis of the coil of wire is substantially aligned with a principal axis of the anisotropic reflector assembly. ### Claim 19 (depends on 18) The automobile headlamp assembly of claim 18, wherein a cross-section of the coil of wire has a height and a width, the height of the cross-section of the coil of wire being greater than the width of the cross-section of the coil of wire. ### Claim 20 (depends on 19) The automobile headlamp assembly of claim 19, wherein a shape of the cross-section of the coil of wire comprises an oval shape. ### Claim 21 (depends on 19) The automobile headlamp assembly of claim 19, wherein a shape of the cross-section of the coil of wire comprises a rounded rectangular shape. ### Claim 22 (depends on 19) The automobile headlamp assembly of claim 19, wherein the height of the cross-section of the coil of wire is between about 1.05 and about five times the width of the cross-section of the coil of wire.