LED light assembly
DC
First Claim
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1. A light assembly comprising:
- a parabolic reflector defining a reflecting cavity having a linear focal axis;
a plurality of LEDs positioned in said cavity, each said LED having an optical axis; and
a collimating lens mounted within said reflecting cavity, wherein the optical axis of each said LED intersects said linear focal axis passes through said collimating lens, said collimating lens arranged to collimate light emitted from said at least one LED that is not incident upon said reflecting surface while allowing light emitted from said at least one LED incident upon said reflecting surface to exit said light assembly without further change of direction after reflection from said reflecting surface.
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Abstract
An light source utilizes a parabolic reflector to collimate light emitted from at greater than a predetermined angle relative to the optical axis of an LED arranged at the focus of the reflector. An optional collimating lens is arranged to collimate light emitted at less than the predetermined angle. Both variations provide light in the form of a substantially collimated beam. The parabolic reflector is preferably extended along its focal point to form a linear parabolic section having a linear focal axis. A linear array of LEDs is arranged such that the linear focal axis passes through the area of light emission of each LED. The linear parabolic section may be provided with parabolic dish ends. Alternatively, the ends of the parabolic section may be left open for increased wide angle visibility.
396 Citations
23 Claims
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1. A light assembly comprising:
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a parabolic reflector defining a reflecting cavity having a linear focal axis;
a plurality of LEDs positioned in said cavity, each said LED having an optical axis; and
a collimating lens mounted within said reflecting cavity, wherein the optical axis of each said LED intersects said linear focal axis passes through said collimating lens, said collimating lens arranged to collimate light emitted from said at least one LED that is not incident upon said reflecting surface while allowing light emitted from said at least one LED incident upon said reflecting surface to exit said light assembly without further change of direction after reflection from said reflecting surface. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A light assembly comprising:
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a reflector comprising a concave reflecting surface defining a reflecting cavity, said reflecting surface flaring from an inner vertex to an open outer end, said reflecting surface being symmetrical to a plane through said vertex;
at least one light emitting diode having an optical axis and disposed in said reflecting cavity such that said optical axis is generally coincident with said plane; and
a collimating lens mounted within said reflecting cavity, wherein said collimating lens is configured to collimate substantially all light output from said at least one LED that is not incident upon said reflecting surface without altering the direction of light emitted from said at least one LED reflected by said reflecting surface. - View Dependent Claims (13, 14, 15, 16, 17, 18)
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19. A light assembly comprising:
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an elongated concave reflector extending a first longitudinal span and having a linear focal axis; and
a linear array of LEDs, each said LED having an optical axis and a light output on said optical axis of a first luminous intensity, wherein the optical axes of said LEDs substantially intersect said focal axis in orthogonal relationship thereto, the reflector integrates the light output of said array of LEDs into a band of illumination extending the longitudinal span of said reflector, said reflector defines a central directional axis and said band of illumination has a continuous second luminous intensity distribution measured in a horizontal plane passing through said linear focal axis, each point of said second luminous intensity distribution exceeding three times the sum of the first intensities over an arc of 30 degrees to either side of said directional axis in said horizontal plane. - View Dependent Claims (20, 21, 22, 23)
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Specification
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Litigation Data
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Current AssigneeWhelen Engineering Company Incorporated
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Original AssigneeWhelen Engineering Company Incorporated
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InventorsSmith, Todd J., Stopa, James L.
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Primary Examiner(s)Sember, Thomas M.
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Application NumberUS10/081,905Publication NumberTime in Patent Office621 DaysField of Search362/235, 362/800, 362/249, 362/294, 362/373, 362/244, 362/245, 362/240, 362/242, 362/243US Class Current362/240CPC Class CodesB64D 47/02 Arrangements or adaptations...F21S 4/20 with light sources held by ...F21S 43/14 Light emitting diodes [LED]F21S 43/15 Strips of light sourcesF21S 43/31 Optical layout thereofF21S 45/47 Passive cooling, e.g. using...F21V 13/04 the elements being reflecto...F21V 17/164 the parts being subjected t...F21V 29/70 characterised by passive he...F21V 29/75 with fins or blades having ...F21V 29/763 the planes containing the f...F21V 5/04 of lens shapeF21V 7/005 with an elongated shape to ...F21V 7/06 with parabolic curvatureF21W 2107/10 for land vehiclesF21W 2107/30 for aircraftF21Y 2103/10 comprising a linear array o...F21Y 2115/10 Light-emitting diodes [LED]H01L 2224/48091 ArchedH01L 2224/73265 Layer and wire connectorsView All
