Bending LED bulb

• US 8,115,370 B2
• Filed: 08/11/2010
• Issued: 02/14/2012
• Est. Priority Date: 09/02/2009
• Status: Active Grant

• Current Assignee: Liquidleds Lighting Corp.
• Original Assignee: Liquidleds Lighting Corp.
• Inventors: Huang, David
• Primary Examiner(s): Patel, Ashok
• Application Number:
  US12/854,277
• Publication Number:
  US 20110050073A1
• Time in Patent Office: 552 Days
• Field of Search: None
• US Class Current: 313/46
• CPC Class Codes: F21K 9/00 Light sources using semiconductor devices as light-generating elements, e.g. using light-emitting diodes [LED] or lasers
• CPC Class Codes: F21S 4/26 of rope form, e.g. LED lighting ropes, or of tubular form
• CPC Class Codes: F21V 29/70 characterised by passive heat-dissipating elements, e.g. heat-sinks
• CPC Class Codes: F21Y 2103/33 annular
• CPC Class Codes: F21Y 2107/00 Light sources with three-dimensionally disposed light-generating elements
• CPC Class Codes: F21Y 2107/90 on two opposite sides of supports or substrates
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: Y10S 362/80 Light emitting diode

Abstract

A bending LED bulb has a transparent bending tube and a flexible LED strip. The flexible LED strip has a flexible printed circuit board (PCB) and a plurality of LEDs mounted on the flexible PCB and is inserted and fixed in the transparent bending tube. As the LEDs are sequentially mounted on the flexible PCB, the LEDs are adjacent to a wall of the transparent bending tube, and are equally spaced. Accordingly, a lumen value of the bending LED bulb can be raised, and heat generated by the LEDs can be dissipated out through the wall of the transparent bending tube to avoid high temperature arising from accumulation of the waste heat.

Claims

1. A bending LED bulb comprising:

a transparent bending tube made of glass and having;

two ends; and

at least one sealing end formed on at least one of the ends of the transparent bending tube, each one of the at least one sealing end having a power electrode mounted thereon; and

at least one flexible LED strip mounted in the transparent bending tube and each one of the at least one flexible LED strip having;

a flexible PCB electrically connected with the at least one power electrode; and

a plurality of LEDs separately mounted on the flexible PCB.

2. The bending LED bulb as claimed in claim 1, wherein

the flexible PCB of each one of the at least one flexible LED strip has two metal wires formed thereon and electrically connected with the power electrode of each one of the at least one sealing end;

and

the LEDs of each one of the at least one flexible LED strip are classified into multiple sub light groups parallelly connected with the two metal wires of the flexible LED strip, and each sub light group has multiple LEDs serially connected.

3. The bending LED bulb as claimed in claim 1, wherein the LEDs of each one of the at least one flexible LED strip are mounted on two opposite sides of the flexible PCB of the flexible LED strip.

4. The bending LED bulb as claimed in claim 1, wherein three flexible LED strips are mounted inside the transparent bending tube in a form of a triangular column.

5. The bending LED bulb as claimed in claim 1, wherein the transparent bending tube has two sealing ends and is alternatively and repeatedly bent up and down to have the two sealing ends facing a same direction.

6. The bending LED bulb as claimed in claim 1, wherein the transparent bending tube is helically wounded to take a form of a circular helix.

7. The bending LED bulb as claimed in claim 1, wherein the transparent bending tube is U-shaped.

8. The bending LED bulb as claimed in claim 1, wherein the transparent bending tube is formed by a small C tube and a large C tube mounted around the small C tube with openings of the two C tubes facing an identical direction.

9. The bending LED bulb as claimed in claim 1, wherein the transparent bending tube is spirally wounded.

10. The bending LED bulb as claimed in claim 1, wherein the transparent bending tube is helically wounded to take a form of a conic helix.

11. The bending LED bulb as claimed in claim 1, wherein the transparent bending tube is filled with a gas having a heat transfer coefficient higher than that of air.

12. The bending LED bulb as claimed in claim 11, wherein the gas is an inert gas.

13. The bending LED bulb as claimed in claim 1, wherein the LEDs of each one of the at least one flexible LED strip are mounted on the flexible PCB of the flexible LED strip at an equal interval.

14. The bending LED bulb as claimed in claim 1, wherein the transparent bending tube is filled with a liquid.