Dual optical interface LED lamp

• US 9,759,387 B2
• Filed: 03/04/2014
• Issued: 09/12/2017
• Est. Priority Date: 03/04/2014
• Status: Active Grant

• Current Assignee: IDEAL Industries Lighting, LLC (Ideal Industries Incorporated)
• Original Assignee: CREE Incorporated (Wolfspeed, Inc.)
• Inventors: Progl, Curt, Athalye, Praneet
• Primary Examiner(s): Mai, Anh
• Assistant Examiner(s): HORIKOSHI, STEVEN Y
• Application Number:
  US14/196,352
• Publication Number:
  US 20150252953A1
• Time in Patent Office: 1,288 Days
• 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 9/238 Arrangement or mounting of circuit elements integrated in the light source
• CPC Class Codes: F21K 9/62 using mixing chambers, e.g. housings with reflective walls
• 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 23/006 the substrate being distinct from the light source holder
• 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: F21Y 2107/30 on the outer surface of cylindrical surfaces, e.g. rod-shaped supports having a circular or a polygonal cross section
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]

Abstract

A LED lamp includes an at least partially optically transmissive enclosure and a base connected to the enclosure. A plurality of LEDs are located in the enclosure and are operable to emit light when energized through an electrical path from the base. An optical interface is positioned in the enclosure for electrically isolating a live electrical component and for receiving at least a portion of the light. The optical interface includes a light modifying property for modifying a characteristic of the portion of the light.

Claims

1. A lamp comprising:

an at least partially optically transmissive glass enclosure;

a base defining a longitudinal axis of the lamp extending from the base to the at least partially optically transmissive glass enclosure;

a heat sink extending into the at least partially transmissive glass enclosure substantially along the longitudinal axis;

at least one LED mounted on a submount, the submount being mounted on the heat sink in the at least partially optically transmissive glass enclosure, and the at least one LED operable to emit light when energized through an electrical path from the base to the submount, the electrical path comprises a lamp electronics board and a deformable electrical contact on one of the submount and the lamp electronics board that is biased into engagement with an electrical contact on the other one of the submount and the lamp electronics board to create a live contact coupling in the enclosure, the submount being generally cylindrically shaped and extending along the longitudinal axis;

an optical interface disposed between the at least one LED and the at least partially optically transmissive glass enclosure, the optical interface being generally cylindrically shaped and open at at least one end thereof and being suspended on the heat sink and disposed outside of the submount such that light from the at least one LED passes through the optical interface, said optical interface being electrically insulating and configured to electrically isolate at least the live contact coupling and comprising a light modifying property such that a characteristic of the light may be modified as the light passes through the optical interface, wherein a passage is provided allowing a gas to circulate between the at least one LED and the enclosure, the passage being configured such that a probe simulating a human finger cannot contact the live contact coupling through the passage.

2. The lamp of claim 1 wherein the characteristic of the light comprises a color of the light.

3. The lamp of claim 1 wherein the optical interface comprises a phosphor.

4. The lamp of claim 1 wherein the light modifying property is caused by a material comprising a rare earth element (REE).

5. The lamp of claim 4 wherein the REE comprises neodymium.

6. The lamp of claim 1 wherein light comprises a second characteristic and the optical interface comprises a second light modifying property where the optical interface modifies the first and second characteristics.

7. The lamp of claim 1 wherein light passing through the optical interface is filtered so that the light exiting the optical element exhibits a spectral notch.

8. The lamp of claim 7 wherein the spectral notch occurs between the wavelengths of 520 nm and 605 nm.

9. The lamp of claim 1 wherein the base comprises an Edison screw.

10. The lamp of claim 1 wherein the optical interface comprises an elastic material.

11. The lamp of claim 1 wherein the optical interface comprises silicone.

12. A lamp comprising:

an at least partially optically transmissive glass enclosure;

a base connected to the enclosure;

a heat sink extending into the at least partially optically transmissive glass enclosure;

a plurality of LEDs located in the at least partially optically transmissive glass enclosure and operable to emit light when energized through an electrical path from the base, the plurality of LEDs being mounted on a submount where the submount is in the electrical path;

wherein the electrical path comprises a lamp electronics board and a deformable electrical contact on one of the submount and the lamp electronics board that is biased into engagement with an electrical contact on the other one of the submount and the lamp electronics board to create a live contact coupling in the enclosure;

an optical interface positioned in the at least partially optically transmissive glass enclosure and spaced from the submount for electrically isolating a live electrical component from the exterior via breaks in the at least partially optically transmissive glass enclosure of the lamp in the event that the at least partially optically transmissive glass enclosure breaks and for receiving at least a portion of the light, the optical interface comprising a glass enclosure having a shatter resistant coating and comprising a light modifying property for modifying a characteristic of the portion of the light, the optical interface being generally cylindrically shaped and open at least one at end thereof and being suspended on the heat sink and disposed outside of the submount such that light from the at least one LED passes through the optical interface, said optical interface being electrically insulating, and wherein a passage is provided allowing a gas to circulate between the at least one LED and the enclosure, the passage being configured such that a probe simulating a human finger cannot contact the live contact coupling through the passage.

13. The lamp of claim 12 wherein the characteristic of the light comprises a color of the light.

14. The lamp of claim 12 wherein the optical interface comprises a phosphor.

15. The lamp of claim 12 wherein the optical interface comprises a rare earth element (REE).

16. The lamp of claim 12 wherein light comprises a second characteristic and the optical interface comprises a second light modifying property where the optical interface modifies the first and second characteristics.

17. The lamp of claim 12 wherein the base comprises an Edison screw.