LED LIGHT BULB WITH TRANSLUCENT SPHERICAL DIFFUSER AND REMOTE PHOSPHOR THEREUPON

• US 20130057140A1
• Filed: 05/19/2011
• Published: 03/07/2013
• Est. Priority Date: 05/20/2010
• Status: Active Grant

• Current Assignee: Light Prescriptions Innovators, LLC
• Original Assignee: Light Prescriptions Innovators, LLC
• Inventors: Falicoff, Waqidi, Sun, Yupin, Shatford, Will
• Granted Patent: US 8,896,198 B2
• Time in Patent Office: Days
• US Class Current: 313/483
• 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 9/62 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: F21Y 2107/10 on concave supports or substrates, e.g. on the inner side of bowl-shaped supports
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]

Abstract

An LED lamp is disclosed comprising a remote phosphor patch on or near the interior surface of a translucent sphere. The phosphor is illuminated by an adjacent light box containing blue LEDs, located within the lamp below the transmissive phosphor patch or alternatively above a reflective phosphor patch. The reflective patch can be either fully or partially populated with phosphor. Below the light box is an electronics bay, and below that is an Edison screw-in base.

Claims

1. A remote-phosphor lamp comprising:

a round, translucent diffuser; and

a light engine that in operation emits light into the interior of the diffuser through an exit aperture occupying a minor portion of the round surface of the diffuser;

wherein the light engine comprises;

a phosphor patch; and

a source of light that in operation illuminates and excites the phosphor.

2. The lamp of claim 1, wherein the exit aperture is formed by a diffusive component.

3. The lamp of claim 2, wherein the diffusive component is the phosphor patch.

4. The lamp of claim 1, wherein the light engine comprises a light box on the outside of the diffuser, wherein the light source is within the light box and the exit aperture is an exit for light from the light box.

5. The lamp of claim 4, wherein the phosphor patch faces the exit aperture and the light source is on a surface of the light box facing the phosphor patch.

6. The lamp of claim 4, wherein the light box is in the shape of a cone frustum, the exit aperture forms the small end of the cone frustum, the light source is on the conical surface of the cone frustum, and a reflective surface forms the large end of the cone frustum.

7. The lamp of claim 1 wherein the light source comprises one or more blue emitters.

8. The lamp of claim 7, wherein the light source further comprises one or more red emitters, and the phosphor down-converts part of the blue light from the blue emitters to green or yellow light.

9. A remote-phosphor LED lamp comprising a translucent spherical diffuser with a phosphor patch on its interior surface, said phosphor patch illuminated with blue light.

10. The lamp of claim 9, wherein said blue light is provided by a light box containing blue LEDs, said light box with diffusely reflecting interior walls of high reflectance, said light box with an exit aperture coupled to said phosphor patch.

11. The lamp of claim 9, wherein said blue light is provided by one or more blue LEDs positioned adjacent to them within said sphere.

12. The lamp of claim 10, wherein said light box has a heat pipe attached to said one or more LEDs.

13. The lamp of claim 11, further comprising one or more red LEDs.

14. The lamp of claim 11, further comprising an Edison socket at the base.

15. The lamp of claim 9, wherein said phosphor patch is a silk-screened array of phosphor dots on a partially reflecting substrate.

16. The lamp of claim 10, wherein said light box also comprises LEDs emitting colors other than blue.

17. A remote-phosphor LED lamp comprising a translucent spherical diffuser with a phosphor patch, said phosphor patch illuminated with blue light, wherein said blue light is provided by a light box containing blue LEDs, said light box with diffusely reflecting interior walls of high reflectance, said light box with an exit aperture, wherein said phosphor patch is on an interior side wall of the said light box which is coupled to a transmissive diffusing surface of the said translucent spherical diffuser.

18. A remote-phosphor LED lamp comprising a translucent diffuser with a phosphor patch on its interior surface, said phosphor patch illuminated with blue light in an integrating box.