Solid state tube light assembly

• US 8,449,137 B2
• Filed: 06/29/2011
• Issued: 05/28/2013
• Est. Priority Date: 06/24/2009
• Status: Active Grant

• Current Assignee: Elumigen Llc
• Original Assignee: Elumigen Llc
• Inventors: Dassanayake, Mahendra, De Mel, Srini, Samarabandu, Jagath
• Primary Examiner(s): Neils, Peggy A.
• Application Number:
  US13/172,480
• Publication Number:
  US 20110255277A1
• Time in Patent Office: 699 Days
• Field of Search: 362/231, 362/293, 362/240, 362/241, 362/249.02, 362/217.01, 362/217.06, 362/223, 362/247, 362/341, 362/347, 362/296.08
• US Class Current: 362/217.06
• CPC Class Codes: F21K 9/232 specially adapted for generating an essentially omnidirectional light distribution, e.g. with a glass bulb
• CPC Class Codes: F21K 9/64 using wavelength conversion means distinct or spaced from the light-generating element, e.g. a remote phosphor layer
• CPC Class Codes: F21V 13/08 the elements being filters or photoluminescent elements and reflectors
• CPC Class Codes: F21V 23/009 the casing being inside the housing of the lighting device
• CPC Class Codes: F21V 29/70 characterised by passive heat-dissipating elements, e.g. heat-sinks
• CPC Class Codes: F21V 29/75 with fins or blades having different shapes, thicknesses or spacing
• CPC Class Codes: F21V 29/767 the planes containing the fins or blades having directions perpendicular to the light emitting axis
• CPC Class Codes: F21V 3/00 Globes; Bowls; Cover glasses with refracting properties F21V5/00; with reflecting properties F21V7/00; characterised by cooling arrangements F21V29/506
• CPC Class Codes: F21V 3/02 characterised by the shape
• CPC Class Codes: F21V 7/0025 Combination of two or more reflectors for a single light source array of reflectors for a cluster of light sources F21V7/0083
• CPC Class Codes: F21V 7/06 with parabolic curvature
• CPC Class Codes: F21V 7/08 with elliptical curvature
• CPC Class Codes: F21V 7/28 characterised by coatings
• CPC Class Codes: F21V 9/06 for filtering out ultraviolet radiation
• CPC Class Codes: F21V 9/08 for producing coloured light, e.g. monochromatic; for reducing intensity of light with provision for controlling the colour F21V9/40
• CPC Class Codes: F21V 9/30 Elements containing photoluminescent material distinct from or spaced from the light source shades F21V1/17; globes, bowls or cover glasses F21V3/08, F21V3/12; refractors F21V5/10; reflectors F21V7/26, F21V7/30; elements with provision for controlling the spectral properties or intensity F21V9/40
• CPC Class Codes: F21V 9/35 at focal points, e.g. of refractors, lenses, reflectors or arrays of light sources
• CPC Class Codes: F21Y 2103/33 annular
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]

Abstract

A light assembly that includes an elongated housing, a reflective parabolic cylindrical surface within the elongated housing having a focal line and an elongated cover coupled to the elongated housing. The light assembly also includes a plurality of light sources spaced apart longitudinally and emitting light toward the parabolic cylindrical surface. The parabolic cylindrical surface reflects light from the light sources out of the housing through the cover.

Claims

1. A light assembly comprising:

an elongated housing;

a reflective parabolic cylindrical surface within the elongated housing having a focal line;

an elongated cover coupled to the elongated housing; and

a plurality of light-emitting diodes spaced apart longitudinally along the focal line and emit light toward the parabolic cylindrical surface away from the elongated cover;

said reflective parabolic cylindrical surface reflecting light from the light-emitting diodes out of the housing and through the cover, wherein the light reflected from the parabolic cylindrical surface is collimated in a radial direction and diffuses in a longitudinal direction.

2. A light assembly as recited in claim 1 wherein the housing comprises the parabolic cylindrical surface.

3. A light assembly as recited in claim 1 wherein the housing comprises a cylindrical outer surface and wherein an inner surface of the housing comprises the parabolic cylindrical surface.

4. A light assembly as recited in claim 1 wherein the cover comprise a cylindrical shape.

5. A light assembly as recited in claim 1 wherein the cover and housing define a cylinder.

6. A light assembly as recited in claim 1 wherein the light-emitting diodes are coupled to the housing or cylindrical surface with legs.

7. A light assembly as recited in claim 1 wherein the light-emitting diodes are coupled to a support surface.

8. A light assembly as recited in claim 1 further comprising a light shifting element shifting light reflected from the parabolic cylindrical surface.

9. A light assembly as recited in claim 8 wherein the light shifting element is coupled to the parabolic cylindrical surface.

10. A light assembly as recited in claim 8 wherein the light shifting element supports the light-emitting diodes.

11. A light assembly as recited in claim 8 wherein the light shifting element comprises circuit traces for providing power to the light-emitting diodes from a control circuit.

12. A light assembly as recited in claim 8 wherein the light shifting element is coupled to a band pass filter transmitting light from the light-emitting diodes.

13. A light assembly as recited in claim 1 wherein the plurality of light-emitting diodes emits light toward the elongated housing.