Spherical light output LED lens and heat sink stem system

• US 8,330,342 B2
• Filed: 12/21/2009
• Issued: 12/11/2012
• Est. Priority Date: 12/21/2009
• Status: Active Grant

• Current Assignee: Malek Bhairi
• Original Assignee: Malek Bhairi
• Inventors: Bhairi, Malek
• Primary Examiner(s): Guharay, Karabi
• Assistant Examiner(s): SANTONOCITO, MICHAEL P
• Application Number:
  US12/643,182
• Publication Number:
  US 20110148270A1
• Time in Patent Office: 1,086 Days
• Field of Search: 313/116, 257/E33.073, 362/329, 362/800, 359/743
• US Class Current: 313/116
• 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 5/04 of lens shape
• CPC Class Codes: F21V 7/0091 using total internal reflection
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• 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 2224/32245 the item being metallic
• 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 2224/73265 Layer and wire connectors
• CPC Class Codes: H01L 2924/00 Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
• CPC Class Codes: H01L 2924/00012 Relevant to the scope of the group, the symbol of which is combined with the symbol of this group
• 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 2924/181 Encapsulation
• CPC Class Codes: H01L 33/58 Optical field-shaping elements
• CPC Class Codes: H01L 33/62 Arrangements for conducting electric current to or from the semiconductor body, e.g. lead-frames, wire-bonds or solder balls
• CPC Class Codes: H01L 33/642 characterized by the shape

Abstract

This light emitting diode (LED) device provides a 360 degree lighting angle in the horizontal plane and a 300 degree lighting angle in the vertical plane while simultaneously addressing LED die thermal management, which is critical to high lumen output LEDs. This LED lighting device is comprised of the LED lens, the LED holder and the heat sink stem. Light produced by at least one LED die traveling vertically is diffused by the top refractive portion of the lens. Light rays directed towards the pointed elements are totally internally reflected downwards then refracted out of the lens, thus resulting in a spherical light pattern. This technology is designed as a replacement for conventional light sources, such as incandescent light bulbs, halogen bulbs, CFLs (compact fluorescent lamps) and metal halide lamps.

Claims

1. A lens attachable to a light emitting diode (LED) light source, the lens comprising:

a body having a crown, a base, and a generally cylindrical surface located between the crown and the base;

five (5) pointed, reflective and refractive elements located on the generally cylindrical surface, which totally internally reflect light and then refract light emitted from the LED light source such that the majority of the light rays emitted from the lens is radiated around a 300 degree angle in the vertical plane and 360 degrees in the horizontal plane, wherein the five pointed, reflective and refractive elements abut one another on the generally cylindrical surface; and

an internal surface within the lens roughly parallel to an LED light source which acts as a lens, directing more light towards the pointed elements or towards the crown of the lens.

2. The lens of claim 1, wherein a top portion of each of the pointed elements is coated with a reflective material.

3. The lens of claim 1, wherein the lens is made of a transparent material selected from the group consisting of polymethylmethacrylate (PMMA), polycarbonate (PC), polyetherimide (PEI), cyclic olefin copolymer (COC), and a combination thereof.

4. The lens of claim 1, wherein the lens has a refractive index of 1.4 to 1.6.

5. The lens of claim 1, wherein the base is shaped to couple the base to a LED light source and a LED holder, or a heat sink stem.

6. The lens of claim 5, wherein the base is attached to the LED light source and the LED holder, or the heat sink stem via an optical adhesive.

7. The lens of claim 5, wherein the base is attached to the LED light source with an air gap located between the lens and the LED holder, or the heat sink stem.

8. The lens of claim 5, wherein the base is attached to the LED light source with a refractive index matched material located between the lens and the LED holder, or the heat sink stem.

9. The lens of claim 1, wherein the lens is attached to an LED holder or heat sink stem containing an LED light source with an LED die mounted lens located between the lens and LED holder or heat sink stem.

10. The lens of claim 1, wherein a diameter of the generally cylindrical surface is at least two times greater than a length of the LED.

11. The lens of claim 1, wherein a height of the lens is between two and five times greater than a length of the LED.

12. The lens of claim 1, wherein the crown has a convex shape.

13. The lens of claim 1, wherein the crown has a concave shape.