LED tube lamp

• US 10,190,732 B2
• Filed: 09/29/2017
• Issued: 01/29/2019
• Est. Priority Date: 09/28/2014
• Status: Active Grant

• Current Assignee: Jiaxing Super Lighting Electric Appliance Co., Ltd.
• Original Assignee: Jiaxing Super Lighting Electric Appliance Co., Ltd.
• Inventors: Li, Li-Qin, Jiang, Tao, Yang, Chang, Wang, Bao
• Primary Examiner(s): Tran, Anh
• Application Number:
  US15/720,284
• Publication Number:
  US 20180031186A1
• Time in Patent Office: 487 Days
• Field of Search: None
• CPC Class Codes: B23K 1/0016 Brazing of electronic components
• CPC Class Codes: B23K 2101/42 Printed circuits
• CPC Class Codes: B23K 3/047 electric
• CPC Class Codes: C03C 21/002 to perform ion-exchange between alkali ions C03C21/005 takes precedence
• CPC Class Codes: C03C 27/048 consisting of an adhesive specially adapted for that purpose
• CPC Class Codes: F21K 9/23 Retrofit light sources for lighting devices with a single fitting for each light source, e.g. for substitution of incandescent lamps with bayonet or threaded fittings
• CPC Class Codes: F21K 9/235 Details of bases or caps, i.e. the parts that connect the light source to a fitting; Arrangement of components within bases or caps F21K9/238 takes precedence
• 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 9/272 Details of end parts, i.e. the parts that connect the light source to a fitting; Arrangement of components within end parts F21K9/278 takes precedence
• CPC Class Codes: F21K 9/275 Details of bases or housings, i.e. the parts between the light-generating element and the end caps; Arrangement of components within bases or housings F21K9/278 takes precedence
• CPC Class Codes: F21K 9/278 Arrangement or mounting of circuit elements integrated in the light source
• CPC Class Codes: F21K 9/68 Details of reflectors forming part of the light source
• CPC Class Codes: F21V 15/015 Devices for covering joints between adjacent lighting devices; End coverings
• CPC Class Codes: F21V 17/101 permanently, e.g. welding, gluing or riveting
• CPC Class Codes: F21V 23/009 the casing being inside the housing of the lighting device
• CPC Class Codes: F21V 23/02 the elements being transformers, impedances or power supply units, e.g. a transformer with a rectifier
• CPC Class Codes: F21V 25/02 coming into action when lighting device is disturbed, dismounted, or broken
• CPC Class Codes: F21V 25/04 breaking the electric circuit
• CPC Class Codes: F21V 29/70 characterised by passive heat-dissipating elements, e.g. heat-sinks
• CPC Class Codes: F21V 29/83 the elements having apertures, ducts or channels, e.g. heat radiation holes
• CPC Class Codes: F21V 3/061 : the material being glass
• CPC Class Codes: F21V 3/10 : characterised by coatings
• CPC Class Codes: F21V 7/22 : characterised by materials, surface treatments or coatings, e.g. dichroic reflectors
• CPC Class Codes: F21V 7/28 : characterised by coatings
• CPC Class Codes: F21Y 2101/00 : Point-like light sources
• CPC Class Codes: F21Y 2103/00 : Elongate light sources, e.g. fluorescent tubes
• 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]
• CPC Class Codes: H05B 45/37 : Converter circuits
• CPC Class Codes: H05B 45/50 : responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits
• CPC Class Codes: H05B 6/105 : using a susceptor

Abstract

An LED tube lamp comprises a plurality of LED light sources, an end cap, a power supply disposed in the end cap, a lamp tube, and an LED light strip. The lamp tube extends in a first direction along a length of the lamp tube, and has an end attached to the end cap. The LED light strip is electrically connected the LED light sources with the power supply. The LED light strip has in sequence a first wiring layer, a dielectric layer and a second wiring layer. A thickness of the second wiring layer is greater than a thickness of the first wiring layer.

Claims

1. An LED tube lamp, comprising:

a tube comprising;

a main body region;

two rear end regions respectively at two ends of the main body region; and

two transition regions respectively between the main body region and the two rear end regions,

wherein an outer diameter of each of the rear end regions is less than that of the main body region;

two end caps respectively sleeving the two rear end regions, each of the end caps being made of metal and comprising an electrically insulation member and two conductive pins, wherein

each of the electrically insulation members being fixed to a respective end of the end cap, and the conductive pins extend from the electrically insulation member,

a hot melt adhesive adhered to each of the rear end regions, wherein the hot melt adhesive is enclosed by the corresponding transition region, the corresponding rear end region, and the corresponding end cap; and

an LED light strip in the tube, the LED light strip being provided with a plurality of LED light sources disposed thereon;

wherein a creepage distance between the conductive pin and the corresponding metal made end cap is at least 3.2 mm and not more than 12.5 mm.

2. The LED tube lamp of claim 1, wherein the electrically insulation member is an insulation pad.

3. The LED tube lamp of claim 1, wherein the electrically insulation member comprises a convex portion protruded from the end of the corresponding end cap, and the conductive pins extend from the convex portion.

4. The LED tube lamp of claim 3, wherein the electrically insulation member further comprises a hole, and the conductive pin is coupled to the hole.

5. The LED tube lamp of claim 4, wherein the electrically insulation member further comprises a restriction groove, and the restriction groove is formed on a periphery of the hole.

6. The LED tube lamp of claim 5, wherein the electrically insulation member further comprises a base, the convex portion is on a side of the base, and the hole penetrates through the convex portion and the base.

7. The LED tube lamp of claim 3, wherein the convex portion has a trapezoid shape.

8. The LED tube lamp of claim 7, wherein the trapezoid shape of the convex portion is observed in a cross section along an axial direction of the corresponding end cap.

9. The LED tube lamp of claim 5, wherein a creepage distance between a surface of the convex portion and a surface of the base is not zero and less than 1.5 mm.

10. The LED tube lamp of claim 1, wherein the hot melt adhesive is heated by the corresponding metal made end cap during a securing process.

11. The LED tube lamp of claim 1, wherein the hot melt adhesive comprises high permeability powders and is heated by the high permeability powders during a securing process.

12. The LED tube lamp of claim 1, wherein each of the end caps comprises at least one opening penetrating through the corresponding end cap for heat dissipation while the hot melt adhesive is heated during a securing process.

13. The LED tube lamp of claim 12, wherein each of the end caps comprises:

a lateral wall substantially coaxial with the tube and connected to the corresponding rear end region; and

an end wall substantially perpendicular to an axial direction of the lateral wall and connected to an end of the lateral wall away from the tube;

wherein the at least one opening is disposed on the end wall of the corresponding end cap.

14. The LED tube lamp of claim 13, wherein the electrically insulation member is on the end wall, and the at least one opening penetrates through the electrically insulation member.

15. The LED tube lamp of claim 1, wherein the hot melt adhesive is at least partially filled in an overlapped region between an inner surface of the corresponding lateral wall and an outer surface of the corresponding rear end region.

16. The LED tube lamp of claim 1, wherein the hot melt adhesive electrically insulates the corresponding end cap and the tube.

17. The LED tube lamp of claim 1, wherein the tube further comprises a diffusion film for diffusing light emitted by the LED light sources, the diffusion film is on an outer surface of the tube or an inner surface of the tube.

18. The LED tube lamp of claim 17, wherein the diffusion film is applied to the outer surface of the tube, and the diffusion film contacts with the hot melt adhesive producing increased friction resistance between the end caps and the rear end regions.

19. The LED tube lamp of claim 1, wherein;

and

the LED tube lamp further comprises a power supply circuit comprising a plurality of electronic components, wherein all of the electronic components of the power supply circuit are on the LED light strip.

20. The LED tube lamp of claim 19, wherein the plurality of the electronic components of the power supply circuit comprises a rectifying circuit and a filtering circuit;

the rectifying circuit is configured to rectify an external driving signal to produce a rectified signal;

the filtering circuit is connected to the rectifying circuit and configured to produce a filtered signal.

21. The LED tube lamp of claim 20, wherein the hot melt adhesive comprises welding mud powders.

22. The LED tube lamp of claim 20, wherein the hot melt adhesive comprises phenolic resin, shellac, rosin, calcium carbonate powder, zinc oxide, or a combination thereof.

23. The LED tube lamp of claim 20, wherein there is an accommodation space formed between an inner surface of each of the end caps and an outer surface of the corresponding rear end region, and the hot melt adhesive is in the accommodation space.

24. The LED tube lamp of claim 23, wherein the hot melt adhesive is partially filled into the corresponding accommodation space.

25. The LED tube lamp of claim 24, wherein the hot melt adhesive is between the corresponding rear end region and the corresponding metal member.

26. The LED tube lamp of claim 25, wherein the hot melt adhesive is heated by the corresponding metal member during a securing process.

27. The LED tube lamp of claim 25, wherein the hot melt adhesive comprises high permeability powders and is heated by the high permeability powders during a securing process.

28. The LED tube lamp of claim 25, wherein each of the end caps comprises at least one opening penetrating through the corresponding end cap for heat dissipation while the hot melt adhesive is heated during a securing process.

29. The LED tube lamp of claim 20, wherein the hot melt adhesive electrically insulates the end caps and the tube.

30. The LED tube lamp of claim 20, wherein the tube further comprises a diffusion film for diffusing light emitted by the LED light sources, the diffusion film is on an outer surface of the tube or an inner surface of the tube.

31. The LED tube lamp of claim 30, wherein the diffusion film is applied to the outer surface of the tube, and the diffusion film contacts with the hot melt adhesive producing increased friction resistance between the end caps and the rear end regions.

32. The LED tube lamp of claim 19, wherein the plurality of the electronic components of the power supply circuit comprises a current-limiting element.

33. The LED tube lamp of claim 32, wherein the current-limiting element comprises a resistor, a capacitor, an inductor, or any combination thereof.

34. The LED tube lamp of claim 32, wherein the current-limiting element is configured for reducing EMI (electromagnetic interference).

35. The LED tube lamp of claim 32, wherein the current-limiting element is an element of, or constitutes, a terminal adapter circuit.

36. The LED tube lamp of claim 19, wherein the plurality of the electronic components of the power supply circuit comprises a fuse connected to one of the two conductive pins of one of the end caps.

37. The LED tube lamp of claim 1, wherein:

the LED light strip comprises in sequence a first wiring layer, a dielectric layer and a second wiring layer, a thickness of the second wiring layer is greater than a thickness of the first wiring layer.

38. The LED tube lamp of claim 37, wherein each of the end caps comprises a metal member, the metal member is around the corresponding rear end region.

39. The LED tube lamp of claim 38, wherein each of the end caps further comprises:

a lateral wall substantially coaxial with the tube and connected to the corresponding rear end region; and

an end wall substantially perpendicular to an axial direction of the lateral wall and connected to an end of the lateral wall away from the tube,

wherein the metal member is on the lateral wall.

40. The LED tube lamp of claim 37, wherein each of the end caps comprises:

a lateral wall substantially coaxial with the tube and connected to the corresponding rear end region; and

an end wall substantially perpendicular to an axial direction of the lateral wall and connected to an end of the lateral wall away from the tube; and

an electrically insulation member fixed to the end wall,

wherein the lateral wall and the end wall are metal, and the conductive pin extends from the electrically insulation member.

41. The LED tube lamp of claim 37, wherein the tube further comprises a diffusion film for diffusing light emitted by the LED light sources, the diffusion film is on an outer surface of the tube or an inner surface of the tube.

42. The LED tube lamp of claim 41, wherein the diffusion film is applied to the outer surface of the tube, and the diffusion film contacts with the hot melt adhesive producing increased friction resistance between the end caps and the rear end regions.