REMOTE PHOSPHOR LIGHT ENGINES AND LAMPS

• US 20110096552A1
• Filed: 10/22/2010
• Published: 04/28/2011
• Est. Priority Date: 10/22/2009
• Status: Active Grant

• Current Assignee: Light Prescriptions Innovators, LLC
• Original Assignee: Light Prescriptions Innovators, LLC
• Inventors: Shatford, Will, Sun, Yupin, Parkyn, William, Falicoff, Waqidi
• Granted Patent: US 9,328,894 B2
• Time in Patent Office: Days
• US Class Current: 362/297
• 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 9/64 using wavelength conversion means distinct or spaced from the light-generating element, e.g. a remote phosphor layer
• CPC Class Codes: F21V 29/75 with fins or blades having different shapes, thicknesses or spacing
• CPC Class Codes: F21V 3/12 the coatings comprising photoluminescent substances
• CPC Class Codes: F21Y 2113/13 comprising an assembly of point-like light sources
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]

Abstract

A light engine has a pillar with first and second ends; a circuit board on the first end of the pillar, a light source mounted on the circuit board encircling the pillar and facing towards the second end of the pillar, and a surface extending from the second end of the pillar, that surface and the exterior of the pillar between that surface and the circuit board being coated with a reflective remote phosphor that is excited by light from the light source. The light engine may be used in a light bulb, with a frosted globe enclosing the circuit board and mounted round the outer edge of the phosphor-coated surface, and an Edison screw or other standard base connected to the second end of the pillar.

Claims

1. A light engine comprising:

a pillar with first and second ends;

a circuit board on the first end of the pillar;

a light source mounted on the circuit board encircling the pillar and facing towards the second end of the pillar; and

a surface extending from the second end of the pillar, said surface and the exterior of the pillar between said surface and said circuit board being coated with a reflective remote phosphor that is excited by light from said light source.

2. The light engine of claim 1, wherein said light source encircling said pillar is a ring of light emitting diodes.

3. The light engine of claim 1, wherein said pillar is hollow and electrical power is supplied to said light source through the interior of said pillar.

4. The light engine of claim 1, further comprising a light shield surrounding said circuit board, said light shield diffusely reflecting all light from said chips that does not shine on said reflective remote phosphor.

5. The light engine of claim 1 wherein said laterally extending surface comprises a cup, the rim of said cup even with the plane of said circuit board, said cup with said reflective remote phosphor on its interior surface.

6. The light engine of claim 1, further comprising a frosted globe enclosing said circuit board and receiving the light from said reflective remote phosphor.

7. The light engine of claim 6, further comprising an electronics bay joined to said pillar and a base compatible with a standard lighting receptacle.

8. The light engine of claim 5, further comprising a diffusing globe joining the rim of said cup and receiving the light emitted therefrom, said globe larger than said cup, the plane of the rim of said cup being a chordal plane of said globe, and a base compatible with a standard lighting receptacle joined to said second end of said pillar.

9. The light engine of claim 8, wherein the base is coaxial with the pillar, and is joined to the second end of the pillar through a compartment for electronics for driving the light source.

10. The light engine of claim 5, further comprising a reflector opening from said rim in the direction from said second end towards said first end and a base compatible with a standard lighting receptacle joined to said second end of said pillar.

11. A light engine comprising a circuit board, said circuit board mounted with multiple LED chips, said multiple chips forming a ring, said board with a central pillar mounted thereupon, said pillar extending upwards at least a distance of the diameter of said ring, said pillar hollow, said pillar coated on its exterior surface with a reflective remote phosphor responding to the light of said LED chips, said light engine further comprising a surface extending laterally from the top of said pillar, said surface coated with said reflective remote phosphor.

12. The light engine of claim 11, further comprising a light shield surrounding said circuit board, said light shield diffusely reflecting all light from said chips that does not shine on said reflective remote phosphor.

13. The light engine of claim 11, wherein said laterally extending surface comprises a hemispheric cup, the rim of said cup even with the plane of said circuit board, said cup with a reflective remote phosphor on its interior surface.

14. The light engine of claim 11, further comprising a frosted globe centered on said circuit board and receiving all the light from said reflective remote phosphor.

15. The light engine of claim 14, further comprising an electronics bay joined to said pillar and an Edison-style screw-in or GU24 twist-and-lock base.

16. The light engine of claim 13, further comprising an Edison or GU24 base joined to said pillar and a diffusing globe joining the rim of said hemispheric cup and receiving all light emitted therefrom, said globe larger than said cup, the plane of the rim of said cup being a chordal plane of said globe.

17. The light engine of claim 13, further comprising a conical reflector opening upward from said rim and an Edison-style screw-in base joined to said pillar.