Lens unit and LED module using the same

Patent metadata

Field	Value
Publication number	US-9267665-B2
Application number	US-201314067982-A
Country	US
Kind code	B2
Filing date	Oct 31, 2013
Priority date	Oct 22, 2013
Publication date	Feb 23, 2016
Grant date	Feb 23, 2016

Abstract

A lens unit includes a lens and a reflector received in the lens. The lens includes a light incident face and a light emerging face opposite to the light incident face. The reflector is enclosed by the light incident face. The reflector has a diameter gradually increasing and then decreasing along an optical axis of the lens. The reflector reflects light emitted from the LED divergently to enter the lens. An LED module incorporating the lens unit is also disclosed.

First claim

What is claimed is:

1. A lens unit comprising:
a lens comprising a light incident face and a light emerging face opposite to the light incident face, the lens having an optical axis extending through the light incident face and the light emerging face; and
a reflector located on the optical axis and facing the light incident face, the reflector having an outer diameter firstly increasing and then decreasing along the optical axis.

2. The lens unit of claim 1 , wherein the reflector has an ellipsoid-like shape.

3. The lens unit of claim 1 , wherein the reflector comprises a top end adjacent to the light incident face and a bottom end away from the light incident face, the optical axis extending through the top end and the bottom end of the reflector.

4. The lens unit of claim 3 , wherein the top end of the reflector protrudes towards the light incident face, and the bottom end of the reflector protrudes in a direction away from the light incident face.

5. The lens unit of claim 3 , wherein the top end of the reflector has a curvature less than that of the bottom end of the reflector.

6. The lens unit of claim 3 , wherein the bottom end of the reflector is sharper than the top end of the reflector.

7. The lens unit of claim 1 , wherein the reflector is hung within the lens by a wire.

8. The lens unit of claim 7 , wherein the wire extends through the light incident face and the light emerging face.

9. The lens unit of claim 7 further comprising a block disposed on the light emerging face, wherein a top of the wire is attached to the block, and a bottom of the wire is attached to the reflector.

10. The lens unit of claim 9 , wherein the light emerging face comprises a concave face and a convex face surrounding the concave face, the block abutting against the concave face.

11. The lens unit of claim 9 , wherein the lens defines a slot extending through the light incident face and the light emerging face, the wire being received in the slot and the block being located outside the slot.

12. The lens unit of claim 11 , wherein the light incident face encloses a cavity communicating with the slot, the reflector being received in the cavity.

13. An LED (light emitting diode) module comprising:
a lens comprising a light incident face and a light emerging face opposite to the light incident face;
an LED; and
a reflector placed between the LED and the light incident face, the reflector having an outer diameter firstly increasing and then decreasing along a direction from the LED towards the light incident face;
wherein light emitted from the LED is reflected by the reflector divergently to enter the light incident face.

14. The LED module of claim 13 , wherein the light incident face encloses a cavity receiving the reflector and the LED.

15. The LED module of claim 13 , wherein the reflector comprises a top end adjacent to the light incident face and a bottom end adjacent to the LED, the top end having a curvature less than that of the bottom end.

16. The LED module of claim 13 , wherein the reflector is hung within the lens by a wire extending through the light incident face and the light emerging face.

17. The LED module of claim 16 , wherein the wire has a top attached on a block, and a bottom attached to the reflector.

18. The LED module of claim 17 , wherein the light emerging face comprises a concave face and a convex face surrounding the concave face, the block directly contacting the concave face and being aligned with the reflector.

19. The LED module of claim 17 , wherein the lens has an optical axis sequentially extending through the LED, the reflector, the wire, the light incident face, the light emerging face and the block.

Assignees

• Hon Hai Prec Ind Co Ltd

Inventors

• Hu Chau-Jin
• Huang Yung-Lun

Classifications

• F21V5/04

  of lens shape · CPC title

• F21V7/09

  with a combination of different curvatures · CPC title

• F21V13/04 Primary

  the elements being reflectors and refractors {(for vehicle rear lights F21S43/40)} · CPC title

• F21Y2101/02

  Mechanical Engineering · mapped topic

• F21Y2115/10

  Light-emitting diodes [LED] · CPC title