Elongated LED illumination device

• US 7,850,341 B2
• Filed: 08/04/2005
• Issued: 12/14/2010
• Est. Priority Date: 08/06/2004
• Status: Active Grant

• Current Assignee: Current Lighting Solutions, LLC (f/k/a GE Lighting Solutions, LLC) (American Industrial Partners)
• Original Assignee: GE Lighting Solutions LLC (Savant Systems, LLC)
• Inventors: Sekela, William D., Mayer, Mark J., Mrakovich, Matthew, Brengartner, Ronald Jr.
• Primary Examiner(s): Ward; John A
• Application Number:
  US11/659,687
• Publication Number:
  US 20080030981A1
• Time in Patent Office: 1,958 Days
• Field of Search: 362/227, 362/228, 362/249, 362/250, 362/252, 362/555, 362/235
• US Class Current: 362/249.06
• CPC Class Codes: F21S 4/22 flexible or deformable, e.g. into a curved shape
• CPC Class Codes: F21S 4/28 rigid, e.g. LED bars
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: G02B 6/001 the light being emitted along at least a portion of the lateral surface of the fibre
• CPC Class Codes: G09F 13/22 electroluminescent electroluminescent light sources per se H05B33/00
• CPC Class Codes: H05K 2201/10106 Light emitting diode [LED]

Abstract

An illumination device (10) for simulating neon lighting comprises an elongated light guide (14) and a light engine (12), operatively connected the elongated light guide (14). The light engine includes a plurality of LEDs (18). The light engine is positioned in relation to the light guide (14) such that light emanating from the light engine (12) passes through the light guide (14).

Claims

1. A method of assembling an illumination device that simulates a neon light, the method comprising:

heating and bending an elongated light guide into a desired configuration, the light guide defining a central axis; and

attaching a flexible light engine to the light guide such that the light engine can selectively detach from the light guide by moving the light engine in a direction generally perpendicular to the central axis of the light guide, wherein the light engine comprises a plurality of LEDs connected to a flexible power conductor, wherein the light guide includes a channel adapted to receive the light engine, the method further comprising inserting a member into the channel prior to forming the light guide and removing the member from the channel prior to attaching the light engine to the light guide.

2. The method of claim 1, wherein the light guide includes a channel dimensioned to receive the light guide and the light engine includes a resilient housing for at least one LED, the attaching step further comprising inserting the light engine into the channel such that the resilient housing is compressed in the channel.

3. The method of claim 1, wherein the forming step comprises heating and bending the light guide.

4. An illumination device comprising:

an elongated body having a longitudinal channel formed therein, the elongated body comprising a material adapted to bend into a number of desired configurations, the material also adapted to scatter and transmit light; and

a light engine attached to the elongated body, the light engine comprising at least one LED, a flexible power conductor in electrical communication with the at least one LED, and a resilient housing for the at least one LED, wherein the resilient housing is at least partially received in the longitudinal channel of the elongated body, wherein the light engine is selectively removable from the longitudinal channel by moving the light engine in a direction that is generally perpendicular to a longitudinal axis of the elongated body; and

a bending aid member adapted for selective insertion into the elongated body during heating and bending thereof.

5. The device of claim 4, wherein the elongated body includes a light emitting surface defined by a curved surface that transitions into at least one substantially planar surface.

6. The device of claim 4, wherein the flexible resilient housing includes a light emitting surface and the light guide elongated body includes a light entering surface having a complementary shape to the light emitting surface.

7. The device of claim 6, wherein the light emitting surface of the resilient housing abuts the light entering surfaces of the elongated body.

8. The device of claim 4, wherein the resilient housing is dimensioned to at least substantially fill the channel.

9. The device of claim 4, wherein the elongated body and the light engine are adapted to cooperate with one another to generate a light pattern having its greatest dimension at least substantially perpendicular to a longitudinal axis of the body.

10. An illumination device for simulating neon lighting, the device comprising:

an elongated light guide comprising a material to diffuse and transmit light, the elongated light guide including a longitudinal channel;

at least one printed circuit hoard (“

PCB”

);

a plurality of light emitting diodes (“

LEDs”

) mounted on the at least one PCB; and

a flexible overmolded housing substantially encapsulating each LED and PCB, the overmolded housing disposed inside the longitudinal channel and compressed to engage the light guide via a resilient fit.

11. The device of claim 10, wherein the light guide includes a body portion disposed between a light entering surface and a light exiting surface, the body portion having a mid-plane thickness t measured between the light entering surface and the light exiting surface through a longitudinal axis of the light guide, the light guide having a width w measured along a line that is perpendicular to t, the ratio t:

w being less than about 0.75;

1.

12. The device of claim 10, wherein the light guide includes a body portion having a height h and a width w that is measured perpendicular to the height h, the ratio of h:

w being less than about 1.5;

1.

13. The device of claim 10, wherein the housing is selectively removable from the longitudinal channel by moving the housing in a direction that is generally perpendicular to a longitudinal axis of the elongated light guide.

14. The device of claim 10, wherein the flexible housing includes a light emitting surface and the light guide includes a light entering surface having a complementary shape to the light emitting surface.

15. The device of claim 14, wherein the light emitting surface of the flexible housing abuts the light entering surface of the light guide.

16. The device of claim 15, wherein the flexible housing is dimensioned to at least substantially fill the channel.

17. An illumination device for simulating neon lighting, the device comprising:

an elongated light guide comprising a first extruded material and a second extruded material that covers the first extruded material, the elongated light guide including a longitudinal channel;

at least one printed circuit hoard (“

PCB”

);

a plurality of light emitting diodes (“

LEDs”

) mounted on the at least one PCB; and

a flexible overmolded housing substantially encapsulating each LED and PCB, the overmolded housing disposed inside the longitudinal channel and compressed to engage the light guide via a resilient fit.

18. The device of claim 17, wherein the second extruded material coats on the first extruded material via co-extrusion.

19. The device of claim 17, wherein at least one of the extruded materials comprises an optically clear material.