LED diffusion assembly

• US 6,488,392 B1
• Filed: 06/14/2001
• Issued: 12/03/2002
• Est. Priority Date: 06/14/2001
• Status: Expired due to Fees

• Current Assignee: Lu, Clive S.
• Original Assignee: Lu, Clive S.
• Inventors: Lu, Clive S.
• Primary Examiner(s): Cariaso, Alan
• Assistant Examiner(s): PAYNE, SHARON E
• Application Number:
  US09/880,046
• Time in Patent Office: 537 Days
• Field of Search: 313/500, 313/512, 257/98, 257/99, 362/800, 362/244, 362/246, 362/236, 362/235, 362/227, 362/308, 362/309, 362/339
• US Class Current: 362/308
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: G09F 9/33 being semiconductor devices, e.g. diodes
• CPC Class Codes: H01L 25/075 the devices being of a type provided for in group H01L33/00
• 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 2924/0002 Not covered by any one of groups H01L24/00, H01L24/00 and H01L2224/00
• CPC Class Codes: H01L 33/54 having a particular shape
• CPC Class Codes: Y10S 362/80 Light emitting diode

Abstract

An LED diffusion assembly having a concave tip portion shaped and dimensioned for the diffusion of light emitted thereby. The assembly includes a bulb portion and first and second leads extending within the bulb shaped portion. The assembly also includes LED dice embedded in the bulb shaped portion and coupled to the first and second leads in a manner allowing for transfer of electrical energy to the LED dice. The bulb portion includes a concave tip substantially opposite the LED dice, wherein the concave tip is shaped and dimensioned for diffusing light emitted by the LED dice.

Claims

1. An LED diffusion assembly having a concave tip portion shaped and dimensioned for the diffusion of light emitted thereby, comprising:

a bulb portion;

first and second leads extending within the bulb portion; and

at least one LED die embedded in the bulb portion and coupled to the first and second leads in a manner allowing for transfer of electrical energy to the at least one LED die;

wherein the bulb portion includes a concave tip substantially opposite the at least one LED die, the concave tip being shaped and dimensioned for diffusing light emitted by the at least one LED die, and wherein the concave tip takes the form of a diamond pavilion including a plurality of facets and having a diameter D, a height H and a concave angle a at a base of the concave tip which are so dimensioned such that light emitted by the at least one LED die bends away from the diffusion assembly into the air.

2. The LED diffusion assembly according to claim 1, wherein the bulb portion is formed from an epoxy resin.

3. The LED diffusion assembly according to claim 1, wherein the bulb portion is formed from glass.

4. The LED diffusion assembly according to claim 1, wherein a first end of the first lead is embedded within the bulb portion and coupled to the at least one LED die and a first end of the second lead is embedded within the bulb portion and coupled to the at least one LED die.

5. The LED diffusion assembly according to claim 1, wherein α

is between approximately 85 degrees and 170 degrees.

6. The LED diffusion assembly according to claim 1, wherein D is greater than approximately 2 mm.

7. The LED diffusion assembly according to claim 1, wherein H/D is less than approximately 58%.

8. The LED diffusion assembly according to claim 1, wherein the concave tip includes a Culer convex radius and the minimum Culer convex radius is approximately 1 mm.

9. The LED diffusion assembly according to claim 1, wherein the bulb portion is formed as a composite of different materials.

10. The LED diffusion assembly according claim 1, wherein the at least one LED die consists of two LED dice.