LED lamp with controlled distribution

• US 9,046,224 B2
• Filed: 05/07/2013
• Issued: 06/02/2015
• Est. Priority Date: 05/07/2013
• Status: Active Grant

• Current Assignee: Technical Consumer Products, Inc. (Quality Light Source GmbH)
• Original Assignee: Technical Consumer Products, Inc. (Quality Light Source GmbH)
• Inventors: Yan, Ellis, Chen, Timothy
• Primary Examiner(s): NEILS, PEGGY A
• Application Number:
  US13/889,027
• Publication Number:
  US 20140334158A1
• Time in Patent Office: 756 Days
• Field of Search: 362/247, 362/249.02, 362/294, 362/235
• 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 9/60 Optical arrangements integrated in the light source, e.g. for improving the colour rendering index or the light extraction
• CPC Class Codes: F21V 29/70 characterised by passive heat-dissipating elements, e.g. heat-sinks
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]

Abstract

An LED lamp includes a heat dissipating base. The LED lamp further includes an LED assembly, including a plurality if LEDs. The LED assembly is in thermal communication with the heat dissipating base. The LED lamp further includes a bulb disposed over the LED assembly and coupled to the heat dissipating base. The LED lamp further includes a reflective insert disposed inside the bulb and configured to reflect a portion of light generated by the LED assembly in a substantially downward direction.

Claims

1. An LED lamp comprising:

a heat dissipating base;

an LED assembly, comprising a plurality of LEDs, in thermal communication with the heat dissipating base;

a bulb disposed over the LED assembly and coupled to the heat dissipating base, the bulb defining an inner surface and an upper surface, wherein the upper surface is located along the inner surface of the bulb; and

a reflective insert disposed inside the bulb and configured to reflect a portion of light generated by the LED assembly in a substantially downward direction, the reflective insert comprising;

an inner edge defining a circular opening including a circumference, wherein the circumference of the circular opening of the reflective insert allows a remaining portion of light generated by the LED assembly to pass through the reflective insert and radiate in a substantially upward direction towards the upper surface of the bulb; and

an outermost edge that is flush against the inner surface of the bulb.

2. The LED lamp of claim 1, wherein the reflective insert is substantially flat.

3. The LED lamp of claim 1, wherein the reflective insert is disposed in a center of the bulb, and wherein an outer circumference of the reflective insert is substantially the same as an inner circumference of the center of the bulb.

4. The LED lamp of claim 1, wherein the reflective insert comprises paper.

5. The LED lamp of claim 1, wherein the reflective insert comprises plastic.

6. The LED lamp of claim 1, wherein the reflective insert comprises a reflective coating.

7. The LED lamp of claim 1, wherein the reflective insert is disposed inside the bulb, substantially parallel to the LED assembly.

8. The LED lamp of claim 1, wherein the bulb is transparent.

9. The LED lamp of claim 1, wherein the outermost edge of the reflective insert includes an outer circumference that corresponds with the inner surface of the bulb.

10. The LED lamp of claim 9, wherein the outer circumference of the reflective insert determines a position at which the reflective insert is located within the bulb.

11. The LED lamp of claim 1, wherein the circumference of the circular opening of the reflective insert is sized to allow about 60% of the light generated by the LED assembly to pass through the insert and radiate in the substantially upward direction towards the upper surface of the bulb.

12. The LED lamp of claim 1, wherein the circumference of the circular opening of the reflective insert is determinative of how much of the light generated by the LED assembly is allowed to pass through the reflective insert and radiate in the substantially upward direction.