LED LAMP

• US 20110084554A1
• Filed: 02/09/2010
• Published: 04/14/2011
• Est. Priority Date: 10/13/2009
• Status: Active Grant

• 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: LONG, YUAN, TIAN, FENG, LIU, TAY-JIAN
• Granted Patent: US 8,434,882 B2
• Time in Patent Office: Days
• US Class Current: 307/66
• CPC Class Codes: F21K 9/278 Arrangement or mounting of circuit elements integrated in the light source
• CPC Class Codes: F21S 9/022 Emergency lighting devices
• CPC Class Codes: F21V 29/506 of globes, bowls or cover glasses
• CPC Class Codes: F21V 29/83 the elements having apertures, ducts or channels, e.g. heat radiation holes
• CPC Class Codes: F21Y 2103/10 comprising a linear array of point-like light-generating elements
• CPC Class Codes: F21Y 2105/10 comprising a two-dimensional array of point-like light-generating elements
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]

Abstract

An LED lamp includes an optical part, a heat dissipation member and an electric part. The optical part includes a hollow light penetrable tube and an LED module received in the tube. The heat dissipation member is received in the tube to mount the LED module thereon. The electric part include a circuit board and a rechargeable battery arranged in the tube, and two end covers arranged at two opposite ends of the tube. The LED module is provided with at least one first LED and at least one second LED. The at least one first LED and the at least one second LED cooperatively function as a main light source to provide normal illumination when an external AC power source is supplied normally. The at least one second LED independently function as an auxiliary light source to provide emergency illumination when the external AC power source is interrupted.

Claims

1. An LED lamp, comprising:

an optical part comprising a hollow light penetrable tube and an LED module received in the light penetrable tube, the LED module being provided with at least one first LED and at least one second LED, the at least one first LED and the at least one second LED of the LED module cooperatively functioning as a main light source for normal illumination, the at least one second LED of the LED module functioning independently as an auxiliary light source for emergency illumination;

a heat dissipation member received in the light penetrable tube, the LED module being thermally attached to the heat dissipation member; and

an electric part comprising a circuit board, a rechargeable battery and two end covers, the circuit board and the rechargeable battery being arranged in the light penetrable tube, the two end covers being arranged at two opposite ends of the light penetrable tube, the circuit board forming an AC-to-DC power conversion circuit, a charging circuit and a switching controlling circuit thereon, wherein when an external AC power source is transferred to the AC-to-DC power conversion circuit, the AC-to-DC power conversion circuit converts the AC power source to DC power source and provides a first DC power source at a first output end thereof and a second DC power source at a second output end thereof, the charging circuit being electrically connected to the first output end of the AC-to-DC power conversion circuit to receive the first DC power source, the rechargeable battery being electrically connected to the charging circuit, the auxiliary light source being electrically connected to the rechargeable battery through the switching controlling circuit, the main light source being electrically connected to the second output end of the AC-to-DC power conversion circuit to receive the second DC power source and adapted for providing normal illumination when the external AC power source is supplied normally, the auxiliary light source being adapted for providing emergency illumination when the external AC power source is interrupted, wherein when the external AC power source is supplied normally the switching controlling circuit electrically disconnects the rechargeable battery and the auxiliary light source and wherein when the external AC power source is interrupted the switching controlling circuit electrically interconnects the rechargeable battery and the auxiliary light source.

2. The LED lamp of claim 1, further comprising a photoelectric component, wherein when the external AC power source is interrupted, the photoelectric component functions as a switch between the rechargeable battery and the auxiliary light source.

3. The LED lamp of claim 2, wherein the photoelectric component is a photoresistor.

4. The LED lamp of claim 2, wherein the LED module further comprises a substrate, the at least one first LED, the at least one second LED and the photoelectric component being arranged on the substrate.

5. The LED lamp of claim 1, wherein the LED module further comprises a substrate, the at least one first LED and the at least one second LED being arranged on the substrate, the substrate forming a first electrode, a second electrode and a common electrode thereon, the main light source being electrically connected to the second output end of the AC-to-DC power conversion circuit via the first electrode and the common electrode, the auxiliary light source being electrically connected to the rechargeable battery via the second electrode and the common electrode.

6. The LED lamp of claim 1, wherein the heat dissipation member comprises an elongated base and a plurality of spaced fins extending from the base, the LED module being attached to the base of the heat dissipation member.

7. The LED lamp of claim 6, wherein heat dissipation member is provided with a receiving space, the circuit board being accommodated in the receiving space.

8. The LED lamp of claim 6, wherein heat dissipation member is provided with an accommodating space, a container being accommodated in the accommodating space, the rechargeable battery being received in the container.

9. The LED lamp of claim 6, wherein the light penetrable tube defines a plurality of air exchanging holes through a portion thereof facing the fins of the heat dissipation member to allow air flowing into and out of the light penetrable tube.

10. The LED lamp of claim 1, wherein each of the two end covers forms a pair of pins at an outer end surface thereof, the circuit board being electrically connected to the pair of pins on one of the two end covers.