LED STREET LAMP

• US 20110233568A1
• Filed: 10/08/2009
• Published: 09/29/2011
• Est. Priority Date: 12/18/2008
• Status: Abandoned Application

• Current Assignee: Set Co., Ltd.
• Original Assignee: Set Co., Ltd.
• Inventors: Kim, Jung Suk, An, Haeng Su
• Application Number:
  US12/995,838
• Publication Number:
  US 20110233568A1
• Time in Patent Office: Days
• US Class Current: 257/88
• CPC Class Codes: F21S 8/086 with lighting device attached sideways of the standard, e.g. for roads and highways
• CPC Class Codes: F21V 29/74 with fins or blades
• CPC Class Codes: F21V 29/89 Metals
• CPC Class Codes: F21W 2131/103 of streets or roads
• CPC Class Codes: F21Y 2107/10 on concave supports or substrates, e.g. on the inner side of bowl-shaped supports
• CPC Class Codes: F21Y 2107/20 on convex supports or substrates, e.g. on the outer surface of spheres
• CPC Class Codes: F21Y 2113/00 Combination of light sources
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]

Abstract

Disclosed is a light emitting diode (LED) street lamp using an LED as a light source and capable of minimizing a luminance deviation within an illuminated area while increasing the luminance of the entire illuminated area. The LED street lamp includes a case provided at a front end of a lamp post; a board provided inside the case and having a plurality of LEDs spaced apart from each other; and heat dissipation units closely adhered to the board and dissipating heat generated when the LEDs emit light, wherein the plurality of LEDs have different luminance levels from each other, the luminance levels gradually increase from the center of the board to the edge of the board, and diffusing members diffusing the light generated from the plurality of LEDs are provided on board portions corresponding to areas between each of the plurality of LEDs.

Claims

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

a case provided at a front end of a lamp post;

a board provided inside the case and having a plurality of LEDs spaced apart from each other; and

heat dissipation units closely adhered to the board and dissipating heat generated when the LEDs emit light,

wherein the plurality of LEDs have different luminance levels from each other, the luminance levels gradually increase from the center of the board to the edge of the board, and diffusing members diffusing the light generated from the plurality of LEDs are provided on board portions corresponding to areas between each of the plurality of LEDs.

2. The LED street lamp of claim 1, wherein the board is convexly formed and each of the LEDs is installed on a convex external surface.

3. The LED street lamp of claim 1, wherein the board is concavely formed and each of the LEDs is installed on a concave internal surface.

4. The LED street lamp of claim 2 or 3, wherein the diffusing members are made of a transparent material in the form of a polyhedron such that some of the light beams emitted from the plurality of LEDs are diffused, and protrude from the board until it reaches a position where the light beams from neighboring ones among the plurality of LEDs overlap each other.

6. The LED street lamp of any one of claims 1 and 5, further comprising a diffusion lens installed under the board and collecting the light emitted from the LEDs and uniformly diffusing the collected light into the illuminated area.

5. A light emitting diode (LED) street lamp comprising:

a case provided at a front end of a lamp post;

a board provided inside the case and having a plurality of LEDs spaced apart from each other;

heat dissipation units closely adhered to the board and dissipating heat generated when the LEDs emit light,

wherein assuming that a line passing from the LEDs to the center of beam angles of light illuminated is referred to as an optical center line and an angle between optical center lines of two adjacent LEDs is a beam angle, the beam angle between the two adjacent LEDs decreases gradually from the central portion to the edge of the board.