Elongated LED luminaire and associated methods

• US 9,127,818 B2
• Filed: 10/03/2013
• Issued: 09/08/2015
• Est. Priority Date: 10/03/2012
• Status: Active Grant

• Current Assignee: Lighting Science Group Corporation (Pegasus Capital Advisors, L.P.)
• Original Assignee: Lighting Science Group Corporation (Pegasus Capital Advisors, L.P.)
• Inventors: Maxik, Fredric S., Bartine, David E.
• Primary Examiner(s): Ton, Anabel
• Application Number:
  US14/044,939
• Publication Number:
  US 20140177214A1
• Time in Patent Office: 705 Days
• Field of Search: 362/249.02, 362/558, 362/218, 362/223, 36221702-21707, 362244-247
• US Class Current: 1/1
• CPC Class Codes: F21K 9/27 Retrofit light sources for lighting devices with two fittings for each light source, e.g. for substitution of fluorescent tubes
• CPC Class Codes: F21K 9/60 Optical arrangements integrated in the light source, e.g. for improving the colour rendering index or the light extraction
• CPC Class Codes: F21K 9/61 using light guides
• CPC Class Codes: F21K 9/90 Methods of manufacture
• CPC Class Codes: F21V 17/06 the fastening being onto or by the lampholder
• CPC Class Codes: F21V 29/70 characterised by passive heat-dissipating elements, e.g. heat-sinks
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: Y02B 20/30 Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
• CPC Class Codes: Y10T 29/49117 Conductor or circuit manufacturing

Abstract

A fluorescent tube retrofit luminaire includes a lamp, a light guide, and a heat dissipating frame. The lamp may include a bi-pin base, middle structure, and outer structure, which may include a light-emitting diode (LED)-based light source in thermal communication with a finned heat sink section of the middle structure. Light emitted from the light source may be distributed generally along the length and/or width of the light guide. A bi-pin connector in the light guide may attach the luminaire to a first fluorescent socket. The bi-pin base may be received by a mounting aperture in the light guide before anchoring the luminaire to a second fluorescent socket using a pin-lock. The heat dissipating frame may be in thermal communication with both the light guide and the heat sink section of the lamp.

Claims

1. A luminaire comprising:

a lamp comprising

an outer structure,

a light source configured to emit a source light and carried by the outer structure,

a middle structure connected to the outer structure and comprising a heat sink section in thermal communication with the light source, and

a bi-pin base connected to the middle structure;

a light guide having an inner surface and an outer surface; and

a heat dissipating frame having a contact surface in thermal communication with the outer surface of the light guide;

wherein the light source is configured to emit the source light so as to be incident upon the inner surface of the light guide; and

wherein the light guide is configured to change the source light into a shaped light that illuminates a space proximate to the luminaire.

2. The luminaire according to claim 1 wherein the bi-pin base comprises a pin lock configured to anchor the lamp to a standard fluorescent socket.

3. The luminaire according to claim 1 wherein the light source comprises a light-emitting diode (LED).

4. The luminaire according to claim 1 wherein the outer structure of the lamp further comprises a shelf and an optic;

and wherein the light source is disposed on the shelf and oriented such that the source light emitted from the light source passes through the optic.

5. The luminaire according to claim 1 wherein the light guide is further configured to change the source light into the shaped light using at least one of collimation, concentration, refraction, conversion, reflection, and diffusion.

6. The luminaire according to claim 1 wherein the inner surface of the light guide comprises an optically transmissive material and a reflective material that are configured, in combination, to change the source light into the shaped light.

7. The luminaire according to claim 1 wherein the light guide comprises a conversion material configured to convert a wavelength of the source light so that the wavelength of the shaped light is defined as having a converted wavelength range.

8. The luminaire according to claim 1 wherein the light guide comprises a bi-pin connector configured to mechanically attach to a standard fluorescent socket.

9. The luminaire according to claim 8 wherein the light guide comprises a mounting aperture positioned opposite the bi-pin connector;

and wherein the mounting aperture is sized to fittedly receive at least one of the bi-pin base and the middle structure of the lamp such that a portion of the outer structure of the lamp is positioned adjacent to the light guide.

10. The luminaire according to claim 9 wherein the light guide comprises a substantially elongated-basket shape between the bi-pin connector and the mounting aperture.

11. The luminaire according to claim 10 wherein the heat sink section is substantially cylinder-shaped and comprises a plurality of fins configured to project radially outward therefrom.

12. The luminaire according to claim 11 wherein the middle structure comprises a housing section configured to engage the heat sink section such that a proximal side of the heat sink section is positioned adjacent to the exterior of the housing section, and a distal edge of each of the plurality of fins is substantially exposed to an environment external to the luminaire.

13. The luminaire according to claim 12 further comprising a power supply that is carried within the interior of the housing section, electrically coupled to the light source, and configured to convert and condition AC power to DC power.

14. The luminaire according to claim 1 wherein the heat dissipating frame comprises a plurality of heat sink rods positioned to abut each other to define the contact surface of the heat dissipating frame.

15. The luminaire according to claim 1 wherein the heat dissipating frame comprises a through-hole positioned on a substantially frustoconical attaching end of the heat dissipating frame.

16. The luminaire according to claim 15 wherein a rim of the through-hole is in thermal communication with the heat sink section of the middle structure of the luminaire.

17. A luminaire comprising:

a lamp comprising

an outer structure,

a light source carried by the outer structure and comprising a light-emitting diode (LED) configured to emit a source light,

a middle structure connected to the outer structure and comprising a heat sink section in thermal communication with the light source, and

a bi-pin base connected to the middle structure and comprising a pin lock configured to anchor the lamp to a first fluorescent socket;

a light guide having an inner surface and an outer surface, and comprising a bi-pin connector configured to mechanically attach to a second fluorescent socket; and

a heat dissipating frame having a contact surface in thermal communication with the outer surface of the light guide;

wherein the light source is configured to emit the source light so as to be incident upon the inner surface of the light guide; and

wherein the light guide comprises an optically transmissive material and a reflective material that are configured, in combination, to change the source light into a shaped light that illuminates a space proximate to the luminaire in a generally even distribution along at least one of a length of the light guide and a width of the light guide.

18. The luminaire according to claim 17 wherein the light guide comprises a mounting aperture positioned opposite the bi-pin connector;

and wherein the mounting aperture is sized to fittedly receive the bi-pin base and the middle structure of the lamp such that a portion of the outer structure of the lamp is positioned adjacent to the light guide.

19. The luminaire according to claim 17 wherein the heat dissipating frame comprises a through-hole disposed on an attaching end of the heat dissipating frame and positioned such that a rim of the through-hole is in thermal communication with the heat sink section of the middle structure of the luminaire.

20. A method for retrofitting a fluorescent tube lamp with a luminaire that includes a lamp comprising an outer structure comprising a light source configured to emit a source light, a middle structure attached to the outer structure, and a bi-pin base attached to the middle structure, the luminaire further including a light guide and a heat dissipating frame, the method comprising:

removing the fluorescent tube lamp from a fluorescent light fixture comprising first and second fluorescent sockets;

positioning a contact surface of the heat dissipating frame substantially adjacent to and in thermal contact with an outer surface of the light guide;

aligning a through-hole in the heat dissipating frame with a mounting aperture in the light guide;

inserting the bi-pin base and the middle structure of the lamp through the mounting aperture in the light guide and, in turn, through the through-hole of the heat dissipating frame such that the outer structure of the lamp is fixedly attached to the light guide adjacent the mounting aperture;

mechanically attaching a bi-pin connector disposed on a first end of the light guide to the first fluorescent socket;

anchoring the lamp to the second fluorescent socket by mechanically and electrically attaching to the second fluorescent socket at least one pin lock disposed on the bi-pin base; and

positioning the light guide in relation to the light source such that the source light emitted from the light source is incident upon an inner surface of the light guide, and is changed by the light guide into a shaped light that illuminates a space proximate to the luminaire.