LED replacement for fluorescent lighting

• US 7,114,830 B2
• Filed: 02/28/2005
• Issued: 10/03/2006
• Est. Priority Date: 07/17/2002
• Status: Expired due to Term

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Plastic Inventions and Patents Incorporated
• Inventors: Robertson, Jonas J., Currie, Robert M.
• Primary Examiner(s): Husar, Stephen F
• Application Number:
  US11/066,302
• Publication Number:
  US 20050225979A1
• Time in Patent Office: 582 Days
• Field of Search: 362/217, 362/223, 362/240, 362/241, 362/247, 362/260, 362/800
• US Class Current: 362/240
• 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: F21K 9/68 Details of reflectors forming part of the light source
• CPC Class Codes: F21S 9/022 Emergency lighting devices
• CPC Class Codes: F21V 17/04 the fastening being onto or by the light source
• CPC Class Codes: F21V 23/02 the elements being transformers, impedances or power supply units, e.g. a transformer with a rectifier
• CPC Class Codes: F21V 25/12 Flameproof or explosion-proof arrangements
• CPC Class Codes: F21V 5/043 the lens having cylindrical faces, e.g. rod lenses, toric lenses
• CPC Class Codes: F21V 7/005 with an elongated shape to cooperate with linear light sources
• CPC Class Codes: F21Y 2103/10 comprising a linear array of point-like light-generating elements
• CPC Class Codes: F21Y 2113/00 Combination of light sources
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: H05B 45/3578 Emulating the electrical or functional characteristics of discharge lamps
• CPC Class Codes: H05B 45/382 with galvanic isolation between input and output
• CPC Class Codes: Y02B 20/30 Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
• CPC Class Codes: Y10S 362/80 Light emitting diode

Abstract

The present invention provides several embodiments of an elongate hollow tubular or solid rod lighting device including a plurality of LEDs therewith and appropriate electrical componentry, and serving as a direct replacement for a conventional fluorescent light tube in a conventional fluorescent lighting fixture. The present lighting device includes appropriate connector pins extending from each end thereof, enabling the device to be installed in a conventional fluorescent lighting fixture with no modification to the fixture. The light may include appropriate electrical componentry such as a step-down transformer to provide the required voltage for the LEDs, either integrally within the light, incorporated in an end cap thereof, or installed separately therefrom in the fixture, as desired. The light may be colored or tinted as desired by the use of LEDs providing the desired color output, and/or by installing a tinted sleeve over the tube or rod as desired.

Claims

1. An LED lighting unit for replacing a conventional fluorescent tube between the opposed electrical receptacles of a conventional fluorescent lighting fixture, comprising:

a hollow, rigid, translucent tube having a first end and a second end opposite said first end;

a first end cap disposed upon said first end of said tube, and a second end cap disposed upon said second end of said tube;

a pair of parallel, fluorescent light fixture receptacle connectors extending from each said end cap, and configured for installing within the opposed electrical receptacles of the fluorescent lighting fixture;

a plurality of LEDs disposed within said tube, in electrical contact with one another and with at least said pair of connectors extending from at least one said end cap; and

a reflective coating disposed circumferentially about at least a portion of said tube.

2. The LED lighting unit according to claim 1, wherein each of said LEDs is oriented having its light emissions directed toward said reflective coating.

3. The LED lighting unit according to claim 1, further including a step-down transformer for reducing supply voltage to a level compatible with said plurality of LEDs.

4. The LED lighting unit according to claim 3, wherein said transformer is contained between each said end cap of said tube.

5. The LED lighting unit according to claim 1, wherein said plurality of LEDs are electrically connected in series with one another.

6. The LED lighting unit according to claim 1, further including a tinted sleeve disposed about said tube.

7. The LED lighting unit according to claim 1, wherein at least some of said LEDs emit colored light when electrically actuated.