LED UNIT

• US 20100165635A1
• Filed: 12/29/2008
• Published: 07/01/2010
• Est. Priority Date: 12/29/2008
• Status: Abandoned Application

• Current Assignee: Foxconn Technology Co., Ltd., Fuzhun Precision Industry Company Limited (Foxconn Technology Co., Ltd.)
• Original Assignee: Foxconn Technology Co., Ltd., Fuzhun Precision Industry Company Limited (Foxconn Technology Co., Ltd.)
• Inventors: Zhang, Hai-Wei, Chen, Chin-Chung
• Application Number:
  US12/345,521
• Publication Number:
  US 20100165635A1
• Time in Patent Office: Days
• US Class Current: 362/307
• CPC Class Codes: F21K 9/68 Details of reflectors forming part of the light source
• CPC Class Codes: F21V 13/04 the elements being reflectors and refractors for vehicle rear lights F21S43/40
• CPC Class Codes: F21V 17/164 the parts being subjected to bending, e.g. snap joints
• CPC Class Codes: F21V 5/04 of lens shape
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]

Abstract

An LED unit includes a reflector, an LED mounted in the reflector, and a lens detachably mounted within the reflector and covering the LED. The reflector includes a bottom plate in which the LED is received, an annular sidewall and a tapered sidewall interconnecting the annular sidewall and the bottom plate. The lens includes a disk and dome protruding upwardly from the disk. The reflector forms a pair of buckles at two opposite sides thereof to abut against the disk, thereby fixing the lens therein. A bottom face of the disk confronting the LED and a top face of the dome remote from the LED are all aspheric surfaces.

Claims

1. An LED unit, comprising:

a reflector;

an LED received in the reflector; and

a lens detachably fixed in the reflector and covering the LED;

wherein the lens has a bottom face facing the LED and a top face away from the LED, at least one of the bottom face and the top face of the lens is an aspheric surface.

2. The LED unit as claimed in claim 1, wherein another one of the bottom face and the top face of the lens is also an aspheric surface.

3. The LED unit as claimed in claim 2, wherein the reflector comprises a bottom plate and a sidewall extending upwardly from the bottom plate;

the LED being contained in the bottom plate.

4. The LED unit as claimed in claim 3, wherein the LED comprises a base, an LED die fixed on the base, a substrate fixed on the base and surrounding the LED die, and an encapsulant encapsulating the LED die;

the base and the substrate of the LED being accommodated in the bottom plate of the reflector and the encapsulant of the LED extending upwardly beyond the bottom plate.

5. The LED unit as claimed in claim 3, wherein the reflector further comprises a pair of bendable protrusions and a step, and the lens are retained in the reflector between the pair of protrusions and the step.

6. The LED unit as claimed in claim 5, wherein the reflector defines a pair of cutouts in opposite sides of the sidewall thereof, and the pair of protrusions are respectively received in the pair of cutouts.

7. The LED unit as claimed in claim 6, wherein the reflector has a groove defined around an inner perimeter thereof, and the pair of cutouts each have an upper portion communicating with the groove.

8. The LED unit as claimed in claim 7, wherein the lens comprises a disk and a dome projecting upwardly from a central area of a surface of the disk, and the disk engages in the groove and is locked by the pair of protrusions of the reflector.

9. The LED unit as claimed in claim 8, wherein the one aspheric surface is a part of the dome, and the other aspheric surface is a part of the disk.

10. The LED unit as claimed in claim 1, wherein the lens and the reflector are made from a light-permeable material.

11. An LED unit, comprising:

a housing enclosing a conical space;

an LED attached in the housing at a narrow end of the conical space; and

a lens secured in the housing at a middle portion of the conical space, wherein the lens, the LED and the housing are coaxial, and a face of the lens facing the LED is an aspheric surface.

12. The LED unit as claimed in claim 11, wherein another face of the lens away from the LED is an aspheric surface.

13. The LED unit as claimed in claim 11, wherein the housing is a reflector.

14. The LED unit as claimed in claim 11, wherein the lens is detachably fixed in the housing.

15. The LED unit as claimed in claim 11, wherein the housing forms a pair of buckles at opposite sides thereof to abut against the lens.

16. The LED unit as claimed in claim 11, wherein the lens is spaced a distance from the LED.

17. The LED unit as claimed in claim 11, wherein an inner perimeter of the housing is coated with a reflective layer.

18. The LED unit as claimed in claim 17, wherein a material of the reflective layer is chosen from one of gold, copper and ceramic.

19. The LED unit as claimed in claim 18, wherein the housing is made of transparent material.

20. The LED unit as claimed in claim 11, wherein the lens is made of transparent material.