Light emitting diode lamp tube

• US 7,976,185 B2
• Filed: 07/10/2009
• Issued: 07/12/2011
• Est. Priority Date: 09/17/2008
• Status: Expired due to Fees

• Current Assignee: I-Shou University
• Original Assignee: I-Shou University
• Inventors: Uang, Chii-Maw, Ku, Huei-Ting
• Primary Examiner(s): Ward; John A
• Application Number:
  US12/501,118
• Publication Number:
  US 20100067230A1
• Time in Patent Office: 732 Days
• Field of Search: 362/240, 362/235, 362/249.01, 362/249.02, 362/249.06, 362/217.01, 362/217.02, 362/246, 362/311.01, 362/311.02, 313/512, 313/493, 313/498, 313/634, 315/152
• 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 9/69 Details of refractors forming part of the light source
• CPC Class Codes: F21V 5/02 of prismatic shape F21V5/04 takes precedence
• 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

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.

Claims

1. A light emitting diode (LED) lamp tube comprising:

a lamp device including a circuit board, a plurality of LEDs mounted on said circuit board and electrically connected to said circuit board, and two electrode seats adapted to be electrically connected to a power source and electrically connected to said circuit board; and

a tubular enclosure including an inner peripheral surface, said circuit board being disposed in said tubular enclosure such that said inner peripheral surface of said enclosure is divided into a non-illuminated portion and a light-receiving portion that is positioned for receiving light emitted by said LEDs, said tubular enclosure further including a plurality of tapered protrusions extending from said light-receiving portion toward said LEDs, each of said tapered protrusions converging from said light-receiving portion toward said LEDs and having a pointed inner end distal from said light-receiving portion, and an outer end proximate to said light-receiving portion, each of said tapered protrusions further having a maximum width at said outer end thereof, which increases gradually from a middle portion of said light-receiving portion toward junctions of said light-receiving portion and said non-illuminated portion.

2. The LED lamp tube as claimed in claim 1, wherein each of said protrusions has a cross-section that is shaped as an isosceles triangle.

3. The LED lamp tube as claimed in claim 1, wherein each of said protrusions has a cross-section that is shaped as a right-angled triangle.