Light emitting apparatus

• US 8,272,764 B2
• Filed: 09/28/2009
• Issued: 09/25/2012
• Est. Priority Date: 09/29/2008
• Status: Active Grant

• Current Assignee: Suzhou Lekin Semiconductor Company Limited
• Original Assignee: LG Innotek Company Limited (LG Corporation)
• Inventors: Son, Won Jin
• Primary Examiner(s): Owens, Douglas W
• Assistant Examiner(s): COOPER, JONATHAN G
• Application Number:
  US12/567,995
• Publication Number:
  US 20100079075A1
• Time in Patent Office: 1,093 Days
• Field of Search: 315/35, 315/152, 315/291, 315/294, 362/294, 362/612, 362/373
• US Class Current: 362/294
• 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 9/66 Details of globes or covers forming part of the light source
• CPC Class Codes: F21S 4/20 with light sources held by or within elongate supports
• CPC Class Codes: F21V 17/104 using feather joints, e.g. tongues and grooves, with or without friction
• CPC Class Codes: F21V 17/164 the parts being subjected to bending, e.g. snap joints
• CPC Class Codes: F21V 19/008 of straight tubular light sources, e.g. straight fluorescent tubes, soffit lamps
• CPC Class Codes: F21V 29/507 of means for protecting lighting devices from damage, e.g. housings
• CPC Class Codes: F21V 29/763 the planes containing the fins or blades having the direction of the light emitting axis
• CPC Class Codes: F21V 29/80 with pins or wires
• CPC Class Codes: F21V 29/87 Organic material, e.g. filled polymer composites; Thermo-conductive additives or coatings therefor
• CPC Class Codes: F21V 3/02 characterised by the shape
• CPC Class Codes: F21Y 2103/10 comprising a linear array of point-like light-generating elements
• CPC Class Codes: F21Y 2105/10 comprising a two-dimensional array of point-like light-generating elements
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: H05B 45/34 Voltage stabilisation; Maintaining constant voltage
• CPC Class Codes: H05B 45/3578 Emulating the electrical or functional characteristics of discharge lamps
• CPC Class Codes: H05B 45/42 Antiparallel configurations
• CPC Class Codes: Y02B 20/30 Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]

Abstract

A fluorescent lamp type light emitting apparatus is provided. The light emitting apparatus comprises a cover, a light emitting module, radiation pads, and cap parts. The cover comprises a first cover and a transmissive second cover coupled to the first cover. The light emitting module comprises a plurality of light emitting diodes in the cover. The radiation pads are disposed on the light emitting module. The cap parts comprise electrode terminals at both ends of the cover.

Claims

1. A light emitting unit comprising:

a first cover;

a second cover including a transparent material;

a light emitting module including a circuit board between the first cover and the second cover and a light emitting diode on the circuit board;

at least one radiation pad between the first cover and the circuit board; and

a cap part including a guide coupled to both ends of the first cover and the second cover, a groove on the guide, and a terminal,

wherein at least one of the first cover and the second cover comprises a protrusion coupled with the groove.

2. The light emitting unit of claim 1, wherein at least one of the first cover and the second cover comprises a half-cylindrical cover.

3. The light emitting unit of claim 1, further comprising a coupling protrusion and a coupling groove formed in correspondence with each other at both edges of the first cover and the second cover.

4. The light emitting unit of claim 1, further comprising a diffusion member provided on the second cover.

5. The light emitting unit of claim 1, wherein the radiation pad comprises silicon.

6. The light emitting unit of claim 1, wherein the first cover comprises a metal and heat sink pins having a concavo-convex structure formed on inner and outer surfaces of the first cover.

7. A light emitting unit comprising:

a first cover;

a second cover including a transparent material;

a light emitting module including a circuit board between the first cover and the second cover and a light emitting diode on the circuit hoard;

at least one radiation pad between the first cover and the circuit board; and

a cap part coupled with the first cover and the second cover,

wherein the first cover comprises a protrusion at an edge,

wherein the circuit board contacts at least one surface of the protrusion.

8. The light emitting unit of claim 7, wherein at least one of the first cover and the second cover comprises a half-cylindrical cover.

9. The light emitting unit of claim 7, further comprising a coupling protrusion and a coupling groove formed in correspondence with each other at both edges of the first cover and the second cover.

10. The light emitting unit of claim 7, further comprising a diffusion member provided on the second cover.

11. The light emitting unit of claim 7, wherein the radiation pad comprises silicon.

12. The light emitting unit of claim 7, wherein the first cover comprises a metal and heat sink pins having a concavo-convex structure formed on inner and outer surfaces of the first cover.

13. A light emitting apparatus comprising:

a cover comprising a first cover and a second cover coupled to the first cover, the first cover including

a body in which a cross section is an arc such that a cross section of the first cover and the second cover is a circle, and

a support extended from an inner surface of the body of the first cover to a direction of an inner side of the circle,

the body of the first cover having a plurality of heat sink pins;

a light emitting module comprising a circuit board and a light emitting diode on the circuit board, the circuit board being in contact with the support of the first cover;

a radiation pad on the light emitting module, the radiation pad thermally connected between the circuit board of the light emitting module and an inner surface of the body of the first cover so as to release heat generated from the light emitting diode; and

a cap part comprising electrode terminals coupled at both ends of the cover, the cap part comprising a guide being in contact with outer surfaces of the first cover and the second cover.

14. The light emitting apparatus according to claim 13, wherein one of the first cover and the second cover comprises a coupling protrusion and the other comprises a coupling groove.

15. The light emitting apparatus according to claim 13, wherein the radiation pad stands substantially perpendicular to the circuit board so as to be in contact with the inner surface of the first cover.

16. The light emitting apparatus according to claim 15, wherein a place where the radiation pad is in contact with the inner surface of the first cover is substantially at the center of the first cover.

17. The light emitting apparatus according to claim 13, further comprising a diffusion member diffusing light emitted from the light emitting module to inhibit glare caused by light transmitted by the second cover.