LED LIGHTING DEVICE

• US 20120020108A1
• Filed: 03/16/2011
• Published: 01/26/2012
• Est. Priority Date: 07/22/2010
• Status: Abandoned Application

• Current Assignee: Hon Hai Precision Industry Co., Ltd.
• Original Assignee: Hon Hai Precision Industry Co., Ltd.
• Inventors: CHANG, SHAO-HAN
• Application Number:
  US13/048,876
• Publication Number:
  US 20120020108A1
• Time in Patent Office: Days
• US Class Current: 362/555
• 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 9/61 using light guides
• CPC Class Codes: F21V 29/763 the planes containing the fins or blades having the direction of the light emitting axis
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: G02B 6/0011 the light guides being planar or of plate-like form
• CPC Class Codes: G02B 6/0035 provided on the surface of the light guide or in the bulk of it
• CPC Class Codes: G02B 6/0051 Diffusing sheet or layer
• CPC Class Codes: G02B 6/0061 to provide homogeneous light output intensity
• CPC Class Codes: G02B 6/0091 of the light source relative to the light guide G02B6/0021 takes precedence

Abstract

An LED lighting device includes at least one circuit board, an encapsulation, a number of LED light sources, and a light guiding member. The LED light sources are distributed on the circuit board. The encapsulation is arranged around the light guiding member. The light guiding member includes two opposite surfaces, at least one of which defines a number of accentuated portions. At least one end of the light guiding member includes a light incident surface opposing the LED light sources. After entering the light guiding member from the light incident surface, the light beams from the LED light sources are reflected between the opposite surfaces of the light guiding member. The light beams reaching the accentuated portions are diffused and exit the light guiding member, and are finally transmitted to outside through the encapsulation.

Claims

1. A light emitting diode (LED) lighting device comprising:

at least one circuit board;

a plurality of LED light sources distributed on the circuit board;

a light guiding member comprising two opposite surfaces, at least one of the opposite surfaces defining a plurality of accentuated portions, at least one end of the light guiding member comprising a light incident surface opposing the LED light sources; and

an encapsulation arranged around the light guiding member;

wherein after entering the light guiding member from the light incident surface, the light beams from the LED light sources are reflected between the opposite surfaces of the light guiding member;

the light beams reaching the accentuated portions are diffused and exit the light guiding member, and are finally transmitted to outside through the encapsulation.

2. The LED lighting device of claim 1, wherein the encapsulation is formed to be two semi-circular structures, each end of which defines an inward projecting member.

3. The LED lighting device of claim 1, wherein the encapsulation is formed to be two semi-elliptical structures, each end of which defines an inward projecting member.

4. The LED lighting device of claim 2, further comprises a pair of heat sinks, wherein one end of each heat sink defines a hollow space, two ends of the light guiding member are received in the hollow space of the corresponding heat sink, such that the light guiding member is arranged between the heat sinks.

5. The LED lighting device of claim 4, wherein the other opposite end of each heat sink defines a pair of grooves in opposite sides thereof, the corresponding inward projecting member is engaged in the corresponding groove of the heat sinks to arrow the light guiding member to be arranged in the encapsulation.

6. The LED lighting device of claim 1, wherein the encapsulation is made of diffusion material.

7. The LED lighting device of claim 1, wherein the encapsulation is made of transparent material, and a diffusion layer is applied to each surface of the light guiding member.

8. The LED lighting device of claim 1, wherein the encapsulation is made of transparent material, and a diffusion layer is applied to the outside surface of the encapsulation.

9. The LED lighting device of claim 1, wherein the encapsulation and the light guiding member are integrally formed.