Light emitting diode lamp tube

Details Light emitting diode lamp tube Light emitting diode lamp tube

2011-07-12

2011-07-12

Ward, John A (Department: 2885)

Illumination

Plural light sources

With modifier

C362S311020, C313S512000

Reexamination Certificate

active

07976185

ABSTRACT:
A light emitting diode (LED) lamp tube includes a lamp device including a circuit board, and a plurality of LEDs mounted on the circuit board. The circuit board is disposed in a tubular enclosure such that an inner peripheral surface of the enclosure is divided into a non-illuminated portion and a light-receiving portion. The tubular enclosure has a plurality of tapered protrusions extending from the light-receiving portion toward the LEDs. Each of the tapered protrusions converges from the light-receiving portion toward the LEDs. Each of the tapered protrusions further has a maximum width at an outer end thereof, which increases gradually from a middle portion of the light-receiving portion toward junctions of the light-receiving portion and the non-illuminated portion.

REFERENCES:
patent: 4991070 (1991-02-01), Stob
patent: 6283612 (2001-09-01), Hunter
patent: 6860628 (2005-03-01), Robertson et al.
patent: 7476004 (2009-01-01), Chan
patent: 7611260 (2009-11-01), Lin et al.
patent: 2005/0122742 (2005-06-01), Ho
patent: 2010/0079075 (2010-04-01), Son
patent: 2010/0102729 (2010-04-01), Katzir et al.

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