LIGHT EMITTING DIODE (LED) LIGHTING DEVICE

• US 20100033964A1
• Filed: 08/08/2008
• Published: 02/11/2010
• Est. Priority Date: 08/08/2008
• Status: Abandoned Application

• Current Assignee: Photonics & Co., Limited
• Original Assignee: Photonics & Co., Limited
• Inventors: Chan, Yat Sun, CHOI, Sui Cheung
• Application Number:
  US12/188,824
• Publication Number:
  US 20100033964A1
• Time in Patent Office: Days
• US Class Current: 362/234
• 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: F21K 9/27 Retrofit light sources for lighting devices with two fittings for each light source, e.g. for substitution of fluorescent tubes
• CPC Class Codes: F21Y 2103/10 comprising a linear array of point-like light-generating elements
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]

Abstract

The present invention is an alternative lighting technology to form light emitting diode (LED) light tube. The tubular or circular LED tube is formed by transparent plastic and a metal heat sink that includes LEDs soldered onto a metal core printed circuit board with a special arrangement to achieve greater brightness than an equal distance arrangement. All LEDs are directly inserted into the metal core printed circuit board with a unique insulation coating to allow the LED anode and cathode to be inserted into the metal core printed circuit board and soldered on the opposite side of the metal core printed circuit board. It can connect one or more control units to control intensity.

Claims

1. A light emitting diode (LED) lighting-device for an alternative general lighting, the device being circular or tubular, the device comprising:

a metal core printed circuit board having a plurality of LEDs, wherein density of LEDs from a center of the circuit board decreases towards ends thereof, the metal core printed circuit board having one end engaging a DC electrical input.

2. The lighting device of claim 1, further comprising:

a transparent plastic housing; and

a curved metal heat sink made integral with the plastic housing, forming a circuit tube or rectangular rod, the metal core printed circuit board being in heat conductive connection with the metal heat sink.

3. The lighting device of claim 1, wherein said plurality of LEDs are mounted on the circuit board without any current limiting resistor.

4. The lighting device of claim 2, the circuit board being mounted or embedded into the metal heat sink.

5. The lighting device of claim 2, further comprising:

a secondary metal core printed circuit board;

a transparent housing; and

a secondary metal heat sink.

6. The lighting device of claim 2, wherein the metal heat sink has protective oxide layer, if installed onto a high voltage AC fluorescent fixture.

7. The lighting device of claim 1, being connected to an electronics device to convert AC to DC plus providing constant current.

8. The lighting device of claim 1, wherein the LEDs have an array arrangement connecting in a mixture of series and parallel.

9. The lighting device of claim 5, wherein the transparent plastic housing has a nano-optics material coating on the inner side.

10. The lighting device of claim 1, said LEDs having a driver with a step down output in series or parallel connection.