Composite optical lens with an integrated reflector

• US 20050270666A1
• Filed: 06/04/2004
• Published: 12/08/2005
• Est. Priority Date: 06/04/2004
• Status: Active Grant

• Current Assignee: Creeled Incorporated
• Original Assignee: CREE Incorporated (Wolfspeed, Inc.)
• Inventors: Negley, Gerald H., Loh, Ban P.
• Granted Patent: US 7,280,288 B2
• Time in Patent Office: Days
• US Class Current: 359/726
• CPC Class Codes: G02B 3/00 Simple or compound lenses
• CPC Class Codes: H01L 2224/48091 Arched
• CPC Class Codes: H01L 2224/48247 connecting the wire to a bond pad of the item
• CPC Class Codes: H01L 2924/00014 the subject-matter covered by the group, the symbol of which is combined with the symbol of this group, being disclosed without further technical details
• CPC Class Codes: H01L 33/58 Optical field-shaping elements

Abstract

A composite optical lens is disclosed. The composite optical lens includes a concave bottom surface adapted to receive light, reflective surface adapted to reflect the received light, and optical surface through which the reflected light leaves the optical lens. The concave bottom surface defines a concave cavity allowing placement of at least a portion of a light emitting device within the concave cavity. The concave bottom surface, the optical surface, or both may have predetermined optical finish to operate on the light such as diffusing or focusing the light. The reflective surface can be coated, designed, or both for total internal reflection effect.

Claims

1. A composite optical lens comprising

an concave bottom surface adapted to receive light;

reflective surface adapted to reflect the received light;

optical surface through which the reflected light leaves the optical lens; and

wherein the concave bottom surface defines a concave cavity allowing placement of at least a portion of a light emitting device within the concave cavity.

2. The composite optical lens recited in claim 1 wherein the concave bottom surface is coated with optical material adapted to operate on the light.

3. The composite optical lens recited in claim 2 wherein the optical material is selected from a group consisting of phosphor, diffusants, and frequency-shifting chemical.

4. The composite optical lens recited in claim 3 wherein the optical material is selected from a group consisting of phosphor, diffusants, and frequency-shifting chemical.

5. The composite optical lens recited in claim 1 wherein the reflective surface surrounds the concave cavity.

6. The composite optical lens recited in claim 1 wherein the reflective surface is coated with reflective material.

7. The composite optical lens recited in claim 5 wherein the reflective material is selected from a group consisting of gold, silver, and aluminum.

8. The composite optical lens recited in claim 1 wherein the reflective surface provides a total internal reflection (TIR) for at least a portion of the light emitted by the light emitting device.

9. The composite optical lens recited in claim 1 wherein the optical lens includes a ledge for placement of the lens on a package that comprises the light emitting device.

10. The composite optical lens recited in claim 1 wherein the reflective surface has a predetermined optical finish adopted to scatter the light.