Optical device for semiconductor based lamp

• US 8,390,017 B2
• Filed: 04/18/2012
• Issued: 03/05/2013
• Est. Priority Date: 07/15/2010
• Status: Active Grant

• Current Assignee: Pinecone Energies, Inc.
• Original Assignee: Pinecone Energies, Inc.
• Inventors: Liu, Keh Shium
• Primary Examiner(s): Kim, Jay C
• Application Number:
  US13/449,506
• Publication Number:
  US 20120211790A1
• Time in Patent Office: 321 Days
• Field of Search: 257/79, 257/98, 257/99, 257/100, 257/E33.055, 257/E33.056, 257/E33.059, 257/E33.06, 257/E33.067
• US Class Current: 257/98
• CPC Class Codes: G02B 19/0028 refractive and reflective surfaces, e.g. non-imaging catadioptric systems
• CPC Class Codes: G02B 19/0061 the light source comprising a LED semiconductor devices with at least one potential-jump barrier or surface barrier specially adapted for light emission H01L33/00
• CPC Class Codes: G02B 19/0071 adapted to illuminate a complete hemisphere or a plane extending 360 degrees around the source
• CPC Class Codes: H01L 33/58 Optical field-shaping elements
• CPC Class Codes: H01L 33/60 Reflective elements

Abstract

An optical device for a semiconductor based lamp includes a base and a semiconductor based light-emitting device mounted on the base. A transparent body encapsulates the semiconductor based light-emitting device. A reflective surface is in contact with the transparent body and covers a predetermined region on a top of the transparent body. The reflective surface has an opening. At least a portion of the transparent body protrudes through the opening in the reflective surface. Light emitted from the semiconductor based light-emitting device transmits upwardly through the opening in the reflective surface.

Claims

1. An optical device for a semiconductor based lamp, the optical device comprising:

a base;

a semiconductor based light-emitting device mounted on the base;

a transparent body encapsulating the semiconductor based light-emitting device; and

a reflective surface in contact with the transparent body and covering a predetermined region on a top surface of the transparent body, the reflective surface having an opening in a portion of the reflective surface parallel to the base;

wherein at least a portion of the transparent body protrudes through the opening in the reflective surface;

wherein light emitted from the semiconductor based light-emitting device transmits upwardly through the opening in the reflective surface.

2. The optical device of claim 1, wherein the opening in the reflective surface is at or near a center of the reflective surface.

3. The optical device of claim 1, wherein the portion of the transparent body protruding through the opening in the reflective surface is a center portion of the transparent body.

4. The optical device of claim 1, wherein the transparent body is secured to the base.

5. The optical device of claim 1, wherein the transparent body is made of a material selected from the group consisting of glass and polymer.

6. The optical device of claim 1, wherein end portions of the reflective surface are slanted downward.

7. The optical device of claim 1, wherein the reflective surface comprises a plated reflective material on the top surface of the transparent body.

8. The optical device of claim 1, wherein the portion of the transparent body protruding through the opening includes two convex regions.

9. The optical device of claim 8, wherein the two convex regions are symmetrical about a center axis of the opening in the reflective surface.

10. The optical device of claim 9, wherein each of the two convex regions has a first boundary and a second boundary, and the first boundary faces away from the center axis and is designed to be straight, and the second boundary faces toward the center axis and is designed to be curved.

11. The optical device of claim 1, wherein at least part of the portion of the transparent body protruding through the opening totally internally reflects light emitted by the semiconductor based light-emitting device during use.

12. The optical device of claim 1 further comprising a frosted semi-transparent cover enclosing the base and the transparent body.

13. An optical device for a semiconductor based lamp, the optical device comprising:

a base;

one or more light-emitting diodes (LEDs) mounted on the base;

a transparent body encapsulating the one or more LEDs; and

a reflective surface in contact with the transparent body and covering a predetermined region on a top surface of the transparent body, the reflective surface having an opening in a portion of the reflective surface parallel to the base;

wherein at least a portion of the transparent body protrudes through the opening in the reflective surface;

wherein light emitted from the one or more LEDs transmits upwardly through the opening in the reflective surface.

14. The optical device of claim 13, wherein the opening in the reflective surface is at or near a center of the reflective surface.

15. The optical device of claim 13, wherein the portion of the transparent body protruding through the opening in the reflective surface is a center portion of the transparent body.