Light emitting diode (LED) light bulb

• US 20080285279A1
• Filed: 04/01/2008
• Published: 11/20/2008
• Est. Priority Date: 04/23/2007
• Status: Active Grant

• Current Assignee: Kai Kong Ng, Kuo-Chiu Chiang
• Original Assignee: Kai Kong Ng, Kuo-Chiu Chiang
• Inventors: Ng, Kai Kong, Chiang, Kuo-Chiu
• Granted Patent: US 7,883,242 B2
• Time in Patent Office: Days
• US Class Current: 362/249
• CPC Class Codes: F21K 9/23 Retrofit light sources for lighting devices with a single fitting for each light source, e.g. for substitution of incandescent lamps with bayonet or threaded fittings
• CPC Class Codes: F21V 19/0005 of sources having contact pins, wires or blades, e.g. pinch sealed lamp F21V19/001 takes precedence
• CPC Class Codes: F21V 3/00 Globes; Bowls; Cover glasses with refracting properties F21V5/00; with reflecting properties F21V7/00; characterised by cooling arrangements F21V29/506
• CPC Class Codes: F21V 3/02 characterised by the shape
• CPC Class Codes: F21W 2121/00 Use or application of lighting devices or systems for decorative purposes, not provided for in codes F21W2102/00 – F21W2107/00
• CPC Class Codes: F21Y 2103/10 comprising a linear array of point-like light-generating elements
• CPC Class Codes: F21Y 2105/00 Planar light sources
• CPC Class Codes: F21Y 2107/00 Light sources with three-dimensionally disposed light-generating elements
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: H05B 45/00 Circuit arrangements for operating light-emitting diodes [LED]
• CPC Class Codes: H05B 45/37 Converter circuits
• CPC Class Codes: Y02B 20/30 Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]

Abstract

The present invention relates to an LED light bulb. The LED light bulb comprises a base and a hollow shell. The base has a closed end, an open end and a sleeve between the two ends. The shell is connected to the open end of the base. The LED light bulb comprises at least two LEDs substantially linearly arranged within the shell. By arrangement of multiple LEDs one or more strands the luminance or brightness of the bulb is improved compared with a bulb with one LED or with several horizontally arranged LEDs in a common place, without sacrificing the advantage of energy saving.

Claims

1. A bulb, comprising:

a base, said base further comprising a closed end, an open end and a sleeve therebetween, wherein said sleeve serves as an electrode and said closed end comprises a contact point serving as another electrode;

a hollow shell connected to the open end of the base; and

a strand of at least two LEDs joined together and substantially linearly arranged within the shell

wherein said bulb is adapted for connection to a DC power source.

2. The bulb according to claim 1, further comprising a support for maintaining at least two LEDs in a substantially linear arranged position.

3. The bulb according to claim 2, wherein the support comprises a hollow plastic stem adapted to contain the at least two LEDs.

4. The bulb according to claim 3, wherein the substantially linear LEDs are oriented in a substantially vertical direction in relation to said bulb.

5. The bulb according to claim 1, wherein the base is hollow, and, within the hollow base, the bulb further comprises a power converter for converting AC power to DC power to be supplied to the LEDs.

6. The bulb of claim 5, wherein

both the two electrodes are connected to the input of the power converter;

and

the bulb further comprises an insulating part separating and insulating the two electrodes.

7. The bulb according to claim 6, wherein the power converter comprises a filter circuit, a bridge rectifier circuit, and a resistor;

the bridge rectifier circuit is connected to the electrodes via the filter circuit, and the output of the bridge rectifier circuit is connected to LEDs via the resistor.

8. The bulb according to claim 7, wherein the sleeve of the base comprises external threading.

9. The bulb according to claim 1, wherein the shell is made of translucent or transparent plastic.

10. The bulb according to claim 1, wherein the shell is made of translucent or transparent glass.

11. The bulb according to claim 1, wherein the LEDs are connected in parallel.

12. The bulb according to claim 1, wherein the LEDs are connected in series.

13. An LED bulb, the bulb comprising:

a base, said base further comprising a closed end, an open end and a sleeve therebetween, wherein said sleeve serves as an electrode and said closed end comprises a contact point serving as another electrode;

a hollow shell connected to the open end of the base; and

at least two substantially linear strands of LEDs wherein each substantially linear strand of LEDs further comprises at least two LEDs

wherein said bulb is adapted for connection to a DC power source.

14. The bulb according to claim 13 wherein said at least two substantially linear strands are joined together at one or more points along the length of said substantially linear strands.

15. The bulb according to claim 14 wherein said substantially linear strands are joined to form an array whereby each strand points in a different direction within said compartment.

16. The bulb according to claim 14 wherein said substantially linear strands are each oriented in a substantially vertical orientation within said compartment.

17. The bulb according to claim 13 wherein the LEDs are connected in parallel within each strand.

18. The bulb according to claim 13 wherein the LEDs are connected in series within each strand.