Protective coating for LED lamp

• US 9,570,661 B2
• Filed: 01/10/2013
• Issued: 02/14/2017
• Est. Priority Date: 01/10/2013
• Status: Active Grant

• Current Assignee: IDEAL Industries Lighting, LLC (Ideal Industries Incorporated)
• Original Assignee: CREE Incorporated (Wolfspeed, Inc.)
• Inventors: Lin, Shaow B.
• Primary Examiner(s): COUGHLIN, ANDREW J
• Application Number:
  US13/738,575
• Publication Number:
  US 20140191648A1
• Time in Patent Office: 1,496 Days
• US Class Current: 1/1
• 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 9/233 specially adapted for generating a spot light distribution, e.g. for substitution of reflector lamps
• 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 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: F21V 3/10 characterised by coatings
• CPC Class Codes: F21V 3/12 the coatings comprising photoluminescent substances
• 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]
• CPC Class Codes: H01L 33/52 Encapsulations

Abstract

The present disclosure discloses a method for providing protective coatings onto one or more surfaces of a frangible enclosure of an LED lamp and a lamp prepared therefrom. More particularly, the present disclosure relates to LED lamps comprising polymer coatings on at least one or more surfaces of an enclosure of an LED lamps.

Claims

1. An LED lamp comprising:

at least one LED element energizable through an electrical connection and internal electrical components, wherein the internal electrical components comprise at least one of a power supply, driver, AC/DC converter, and associated electrical path or circuitry thereof;

a frangible enclosure having an internal surface and an external surface, the frangible enclosure coupled to a threaded metal base;

the frangible enclosure enclosing the at least one LED element and at least a portion of the internal electrical components, the frangible enclosure having a main body that tapers to a narrow neck in proximity to the metal base;

wherein at least one LED element is positioned above the narrow neck and is capable of directly emitting light through the narrow neck; and

a coating comprising one or more phosphors, diffusers, and lanthanide oxides, the coating covering one or both of the internal surface and the external surface of the frangible enclosure, the coating providing impact and shatter resistance to the frangible enclosure;

wherein the main body of the frangible enclosure has an apex and a wide portion tapering to the narrow neck, and wherein the coating about the apex or the wide portion is of a different thickness than that about the narrow neck.

2. The LED lamp of claim 1, wherein the coating comprises a polysiloxane or polyurethane.

3. The LED lamp of claim 2, wherein the polysiloxane is a cured, elastomeric polysiloxane or the polyurethane is an elastomeric polyurethane.

4. The LED lamp of claim 1, wherein the coating is at least partially non-transparent to light between about 350 nm to about 850 nm.

5. The LED lamp of claim 1, wherein the coating is transparent to light between about 350 nm to about 850 nm.

6. The LED lamp of claim 1, wherein the coating completely covers one of the internal surface or the external surface of the frangible enclosure.

7. The LED lamp of claim 1, wherein the coating completely covers both the internal surface and the external surface of the frangible enclosure.

8. The LED lamp of claim 1, wherein the at least one LED element is coated with one or more particulates selected from phosphors, diffusers, and lanthanide oxides.

9. The LED lamp of claim 1, wherein the frangible enclosure encloses the at least one LED element and at least a portion of the associated electrical path or circuitry of the internal electrical components.