LED light tube with dual sided light distribution

• US 9,057,493 B2
• Filed: 03/25/2011
• Issued: 06/16/2015
• Est. Priority Date: 03/26/2010
• Status: Active Grant

• Current Assignee: Ilumisys Incorporated (Altair Engineering Incorporated)
• Original Assignee: Ilumisys Incorporated (Altair Engineering Incorporated)
• Inventors: Simon, David L., Ivey, John
• Primary Examiner(s): Sawhney, Hargobind S
• Assistant Examiner(s): Gyllstrom, Bryon T
• Application Number:
  US13/071,576
• Publication Number:
  US 20110235318A1
• Time in Patent Office: 1,544 Days
• Field of Search: 362/225, 362/293, 36221708-21709, 362298-303
• US Class Current: 1/1
• CPC Class Codes: F21K 9/275 Details of bases or housings, i.e. the parts between the light-generating element and the end caps; Arrangement of components within bases or housings F21K9/278 takes precedence
• CPC Class Codes: F21K 9/69 Details of refractors forming part of the light source
• CPC Class Codes: F21S 4/28 rigid, e.g. LED bars
• CPC Class Codes: F21V 29/83 the elements having apertures, ducts or channels, e.g. heat radiation holes
• CPC Class Codes: F21V 7/0008 providing for indirect lighting
• CPC Class Codes: F21V 7/0016 on lighting devices that also provide for direct lighting, e.g. by means of independent light sources, by splitting of the light beam, by switching between both lighting modes
• 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 7/005 with an elongated shape to cooperate with linear light sources
• CPC Class Codes: F21Y 2103/10 comprising a linear array of point-like light-generating elements
• CPC Class Codes: F21Y 2105/10 comprising a two-dimensional array of point-like light-generating elements
• CPC Class Codes: F21Y 2107/90 on two opposite sides of supports or substrates
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: H05K 1/02 Details
• CPC Class Codes: H05K 2201/09063 Holes or slots in insulating substrate not used for electrical connections
• CPC Class Codes: H05K 2201/10106 Light emitting diode [LED]

Abstract

Disclosed herein are embodiments of LED-based lights for use in fluorescent fixtures that emanate light in a plurality of directions. One embodiment disclosed herein of an LED light for use in a fluorescent light fixture comprises a housing and a circuit board having a first surface configured to face an illumination area, the circuit board mounted in the housing and defining a plane conceptually dividing the housing into a first portion and a second portion. At least one LED is mounted on the first surface of the circuit board and is configured to emanate light in a first direction. Light distribution means is configured to distribute a portion of the light emanated in the first direction to at least a second direction different than the first direction.

Claims

1. A method of distributing light in more than one direction from an LED light for use in a fluorescent light fixture having a reflector comprising:

emanating light in a first direction from at least one LED positioned on a circuit board facing an illumination area;

emitting a portion of the light emanated in the first direction from a housing at least partially enclosing the circuit board and the at least one LED through a first portion of the housing facing the at least one LED;

deflecting a portion of the light emanated in the first direction in a second direction with the first portion of the housing;

passing the deflected light through apertures in the circuit board that are in communication with a second portion of the housing;

emitting a portion of the passed light from the housing through the second portion of the housing; and

reflecting the portion of the light emitted from the housing through the second portion of the housing back toward the illumination area with the reflector.

2. The method of claim 1 further comprising:

emitting at least some of the light deflected in the second direction through the apertures from a different portion of the housing.

3. The method of claim 1 further comprising:

installing an LED light in the fixture, the LED light comprising the housing and the circuit board.

4. The method of claim 1, wherein the housing comprises a tubular structure defining the first and second portions.

5. An LED light for use in a fluorescent light fixture comprising:

an generally flat elongate circuit board having a first side with a mounting surface and an opposing second side, and defining at least one aperture;

at least one LED on the mounting surface, the at least one LED configured to emanate light;

a housing for the circuit board, the housing having a tubular cross-sectional profile and laterally divided by the circuit board into a first circumferential portion defining a first lens surface facing the mounting surface and a second circumferential portion defining a second lens surface facing the second side, the first lens surface configured to emit a portion of the emanated light from the housing and deflect a portion of the emanated light to the second lens surface through the at least one aperture defined by the mounting surface, and the second lens surface configured to emit at least a portion of the deflected light from the housing; and

at least one connector arranged at an end of the housing, the housing and the connector defining a package adapted for installation in a fluorescent light fixture.

6. The LED light of claim 5, wherein the first lens surface defines at least one deflecting area configured to deflect a portion of the emanated light to the second lens surface through the at least one aperture defined by the mounting surface.

7. The LED light of claim 6, wherein the at least one deflecting area is a reflector.

8. The LED light of claim 5, wherein the at least one aperture is located inboard from longitudinal edges of the circuit board.

9. The LED light of claim 5, wherein the at least one aperture is located along a center of the circuit board.

10. The LED light of claim 5, wherein the at least one aperture is a cut out along a longitudinal edge of the circuit board.

11. The LED light of claim 5, wherein the second lens surface includes a light pipe, the light pipe having at least one light inlet corresponding to the at least one aperture defined by the mounting surface to receive at least a portion of the deflected light for emission.

12. The LED light of claim 5, wherein the circuit board defines a plane conceptually dividing the housing into the first circumferential portion and the second circumferential portion.

13. The LED light of claim 5, wherein the first circumferential portion and the second circumferential portion approximately comprise respective halves of the circumference of the housing.

14. An LED-based replacement light comprising:

an generally flat circuit board having a first side with a mounting surface and an opposing second side, and defining at least one aperture;

at least one LED on the mounting surface, the at least one LED configured to emanate light;

a housing for the circuit board and the at least one LED, the housing at least partially enclosing the circuit board and the at least one LED and defining a first lens surface spaced from and facing the mounting surface and a second lens surface spaced from and facing the second side, the first lens surface configured to emit a portion of the emanated light from the housing and deflect a portion of the emanated light to the second lens surface through the at least one aperture defined by the mounting surface, and the second lens surface configured to emit at least a portion of the deflected light from the housing; and

at least one connector arranged at an end of the housing, the housing and the connector defining a package adapted for installation in a light fixture.

15. The LED light of claim 14, wherein the first lens surface defines at least one deflecting area configured to deflect a portion of the emanated light to the second lens surface through the at least one aperture defined by the mounting surface.

16. The LED light of claim 15, wherein the at least one deflecting area is a reflector.

17. The LED light of claim 14, wherein the at least one aperture is located inboard from longitudinal edges of the circuit board, is located along a center of the circuit board, or is a cut out along a longitudinal edge of the circuit board.

18. The LED light of claim 14, wherein the second lens surface includes a light pipe, the light pipe having at least one light inlet corresponding to the at least one aperture defined by the mounting surface to receive at least a portion of the deflected light for emission.

19. The LED light of claim 14, wherein the circuit board defines a plane conceptually dividing the housing into a first portion and a second portion, with the first portion defining the first lens surface and the second portion defining the second lens surface.

20. The LED light of claim 14, wherein the circuit board laterally spans the housing, dividing the housing into a first circumferential portion and a second circumferential portion, with the first circumferential portion defining the first lens surface and the second circumferential portion defining the second lens surface.

21. The LED light of claim 20, wherein the first circumferential portion and the second circumferential portion approximately comprise respective halves of the circumference of the housing.