INSIDE-OUT LED BULB

• US 20110234076A1
• Filed: 03/25/2011
• Published: 09/29/2011
• Est. Priority Date: 03/26/2010
• Status: Active Grant

• Current Assignee: Ilumisys Incorporated (Altair Engineering Incorporated)
• Original Assignee: Altair Engineering Incorporated
• Inventors: Simon, David L., Ivey, John
• Granted Patent: US 8,540,401 B2
• Time in Patent Office: Days
• US Class Current: 313/46
• CPC Class Codes: F21K 9/23 Retrofit light sources for lighting devices with a single fitting for each light source, e.g. for substitution of incandescent lamps with bayonet or threaded fittings
• 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 9/61 using light guides
• CPC Class Codes: F21V 21/00 Supporting, suspending, or attaching arrangements for lighting devices F21V17/00, F21V19/00 take precedence; arrangement of signalling or lighting devices, the mounting or supporting thereof or circuits therefor, for vehicles in general B60Q, stands for supporting apparatus or articles in general F16M11/00; Hand grips
• CPC Class Codes: F21V 23/009 the casing being inside the housing of the lighting device
• CPC Class Codes: F21V 23/06 the elements being coupling devices , e.g. connectors
• CPC Class Codes: F21V 29/15 Thermal insulation
• CPC Class Codes: F21V 29/508 of electrical circuits
• CPC Class Codes: F21V 29/70 characterised by passive heat-dissipating elements, e.g. heat-sinks
• CPC Class Codes: F21V 29/74 with fins or blades
• CPC Class Codes: F21V 29/83 the elements having apertures, ducts or channels, e.g. heat radiation holes
• CPC Class Codes: F21Y 2105/10 comprising a two-dimensional array of point-like light-generating elements
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: F21Y 2115/15 Organic light-emitting diodes [OLED]
• CPC Class Codes: Y10T 29/49002 Electrical device making

Abstract

An LED based light comprises a base, a light structure, a heat dissipating structure, and at least one LED. The light structure is adjacent to the base and extends along a longitudinal axis of the light. The light structure includes an inner surface and an outer surface and defines a cavity, and the heat dissipating structure extends into the cavity. At least one LED is mounted in thermally conductive relation to the heat dissipating structure. In one version, the light structure is an annular flange, and an organic LED is mounted to the outer surface. In another version, the light structure is a light pipe configured to distribute a light produced by the at least one LED in a predetermined light distribution.

Claims

1. An LED based light comprising:

a base having a first end and a second end;

a light structure adjacent to the base and extending along a longitudinal axis of the light;

wherein the light structure includes an inner surface and an outer surface and defines a cavity;

a heat dissipating structure extending into the cavity; and

at least one LED mounted in thermally conductive relation to the heat dissipating structure.

2. The LED based light of claim 1 further comprising a connector fixed to the first end of the base and configured to provide a physical connection to a conventional incandescent light fixture.

3. The LED based light of claim 2 further comprising electronics, wherein:

the base defines a compartment;

the electronics are disposed within the compartment;

the connector is further configured to provide an electrical connection to the conventional incandescent light fixture;

the electronics are in electrical communication with the connector and configured to receive a power from a conventional incandescent light fixture through the connector;

the electronics are in electrical communication with the at least one LED; and

the electronics are configured to supply a power suitable for transmission to the at least one LED.

4. The LED based light of claim 3 wherein the base includes a plurality of apertures configured to allow airflow between the compartment and an ambient environment external to the base.

5. The LED based light of claim 1 wherein:

the light structure is an annular flange;

the at least one LED includes at least one organic LED; and

the at least one organic LED is mounted to the outer surface and arranged to emit light in a predetermined light distribution.

6. The LED based light of claim 5 wherein the predetermined light distribution is the light distribution of a conventional incandescent bulb.

7. The LED based light of claim 1 wherein:

the light structure is a light pipe having a proximal end opposing a distal end;

the inner surface is configured for substantially total internal reflection of light; and

the light pipe is configured to distribute a light produced by the at least one LED in a predetermined light distribution.

8. The LED based light of claim 7 wherein the predetermined light distribution is the light distribution of a conventional incandescent bulb.

9. The LED based light of claim 7 wherein:

the heat dissipating structure extends from the base;

the base is made from a thermally conductive material; and

the at least one LED includes a first group of LEDs mounted in thermally conductive relation to the base.

10. The LED based light of claim 9 wherein:

the second end defines an annular platform;

an annular circuit board is mounted on the annular platform;

the first group of LEDs is mounted on and in electrical communication with the annular circuit board; and

the first group of LEDs is oriented to face substantially parallel to the longitudinal axis of the light.

11. The LED based light of claim 7 wherein:

the at least one LED includes a first LED disposed adjacent to the second end of the base;

the proximal end of the light pipe includes a proximal light receiving portion optically configured to receive a light produced by the first LED.

12. The LED based light of claim 11 wherein:

the light pipe is an annular light pipe;

the annular light pipe is solid between the inner surface and outer surface; and

the proximal light receiving portion defines an annular cutaway sized to receive the first LED.

13. The LED based light of claim 11 wherein:

the at least one LED includes a second LED oriented to face the inner surface; and

the inner surface includes an interior light receiving portion optically configured to receive a light produced by the second LED.

14. The LED based light of claim 1 wherein:

the heat dissipating structure is made from highly thermally conductive material; and

the heat dissipating structure has a high surface area to volume ratio.

15. The LED based light of claim 14 wherein the heat dissipating structure is at least one of a plurality of longitudinally extending pins or a plurality of longitudinally extending fins.

16. The LED based light of claim 1 further comprising an active heat dissipating device disposed within the cavity.

17. The LED based light of claim 1 further comprising a first thermal insulating shroud disposed about the base.

18. The LED based light of claim 1 further comprising a second thermal insulating shroud, wherein:

the second thermal insulating shroud extends over the distal end of the light structure to enclose the heat dissipating structure; and

at least one of the light structure or the second thermal insulating shroud includes a plurality of apertures configured to allow airflow between the cavity and an ambient environment external to the light structure.

19. A method making an LED based light comprising:

providing a base having a first end and a second end;

mounting a light structure having an inner surface and an outer surface and defining a cavity adjacent to the base so that the light structure extends along a longitudinal axis of the light;

providing a heat dissipating structure within the cavity; and

mounting at least one LED in thermally conductive relation to the heat dissipating structure.

20. The method of claim 19 wherein the light structure is an annular flange, further comprising:

mounting the annular flange in thermally conductive relation to the heat dissipating structure; and

mounting the at least one LED to the outer surface.

21. The method of claim 19 wherein:

the light structure is a light pipe having a proximal end opposing a distal end;

the inner surface is configured for substantially total internal reflection of light; and

the light pipe is configured to distribute a light produced by the at least one LED in a predetermined light distribution.

22. An LED based light for replacing a conventional incandescent light bulb comprising:

a connector configured to provide a physical connection to a conventional incandescent light fixture;

at least one LED;

a light pipe having an inner surface and an outer surface and extending along a longitudinal axis of the light to define a cavity radially inward of the inner surface;

wherein the light pipe is optically configured to receive a light emitted by the at least one LED and distribute substantially all of the received light radially outward from the light pipe in a predetermined light distribution; and

a heat dissipating structure in thermally conductive relation to the at least one LED and extending into the cavity.

23. The LED base light of claim 22 wherein the outer surface is linear and extends radially outward along the longitudinal axis of the light to form a conical shape.

24. The LED base light of claim 23 wherein the outer surface is contoured to form a bulbous profile.