LED tube light with LED leadframes

• US 10,047,932 B2
• Filed: 05/30/2015
• Issued: 08/14/2018
• Est. Priority Date: 04/02/2015
• Status: Active Grant

• Current Assignee: Jiaxing Super Lighting Electric Appliance Co., Ltd.
• Original Assignee: Jiaxing Super Lighting Electric Appliance Co., Ltd.
• Inventors: Jiang, Tao, Li, Li-Qin
• Primary Examiner(s): Tumebo, Tsion
• Application Number:
  US14/726,465
• Publication Number:
  US 20160290566A1
• Time in Patent Office: 1,172 Days
• Field of Search: 36221714, 362235, 36224908, 1 1
• 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 9/272 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 9/68 Details of reflectors forming part of the light source
• CPC Class Codes: F21V 11/00 Screens not covered by groups F21V1/00, F21V3/00, F21V7/00 or F21V9/00 characterised by cooling arrangements F21V29/502
• CPC Class Codes: F21V 17/101 permanently, e.g. welding, gluing or riveting
• CPC Class Codes: F21V 19/009 the support means engaging the vessel of the source
• CPC Class Codes: F21V 3/02 characterised by the shape
• CPC Class Codes: F21V 3/061 the material being glass
• CPC Class Codes: F21V 7/005 with an elongated shape to cooperate with linear light sources
• CPC Class Codes: F21Y 2103/00 Elongate light sources, e.g. fluorescent tubes
• CPC Class Codes: F21Y 2113/10 of different colours
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]

Abstract

An LED tube light which includes LED light sources mounted in LED leadframes is disclosed. The LED leadframe has a recess, a first sidewall and a second sidewall. Each LED light source includes an LED leadframe and an LED chip, in which LED chip is disposed in recess of LED leadframe. A height of first sidewall of LED leadframe is lower than a height of second sidewall thereof. Inner surface of the first sidewall is a sloped flat or curved surface facing towards outside the recess. First sidewalls of the LED leadframe are arranged along a length direction of the light tube, and second sidewalls of the LED leadframe are arranged along a width direction of the light tube. The LED tube light further includes an LED light bar. The LED light sources together with the LED leadframes are mounted on the LED light bar.

Claims

1. A method for bonding an end cap to a light tube of an

LED tube light, wherein the end cap has an insulating tubular part and a magnetic metal member fixedly disposed on an inner circumferential surface of the insulating tubular part, the method comprising:

coating a hot melt adhesive on an inner surface of the magnetic metal member;

disposing the end cap at an end of the light tube and sleeving the insulating tubular part over the light tube, wherein the magnetic metal member is interposed between the insulating tubular part and the light tube; and

forming an electromagnetic field to heat the hot melt adhesive and bond the hot melt adhesive to the light tube,

wherein the light tube with the bonded end cap includes a plurality of LED light sources disposed therein.

2. The method as claimed in claim 1, wherein the forming an electromagnetic field is by an external equipment, the external equipment includes an induction coil and the magnetic metal member is disposed opposite or adjacent to the induction coil in the radially extending direction of the insulating tubular part.

3. The method as claimed in claim 2, wherein making the magnetic metal member be disposed opposite or adjacent to the induction coil includes inserting the insulating tubular part of the end cap into the induction coil;

and

the end cap and the light tube is moved away from the induction coil when the bonding is complete.

4. The method as claimed in claim 2, wherein making the magnetic metal member be disposed opposite or adjacent to the induction coil includes moving the induction coil to encompass the insulating tubular part of the end cap;

and

the induction coil is moved away from the end cap when the bonding process is complete.

5. The method as claimed in claim 2, wherein during the bonding, the induction coil and the insulating tubular part are coaxially aligned, so that energy transfer to the magnetic metal member is more uniform.

6. The method as claimed in claim 2, wherein a deviation value between the axes of the induction coil and the insulating tubular part during the bonding is not more than 0.05 mm.

7. The method as claimed in claim 1, wherein the magnetic metal member partially overlaps the light tube in the radial direction.

8. The method as claimed in claim 1, wherein the electromagnetic field induces an electrical current in the magnetic metal member to heat the hot melt adhesive.

9. A method for bonding an end cap to a light tube of an

LED tube light, wherein the end cap has an insulating tubular part, the method comprises:

coating a hot melt adhesive including a magnetic object on an inner circumferential surface of the insulating tubular part;

disposing the end cap at the end of the light tube and sleeving the insulating tubular part over the light tube; and

applying an electromagnetic field to the magnetic object in the hot melt adhesive to adhere the end cap with the light tube,

wherein the light tube with the adhered end cap includes a plurality of LED light sources disposed therein.

10. The method as claimed in claim 9, wherein the applying the electromagnetic field is by external equipment, the external equipment includes an induction coil outside the end cap, wherein the magnetic object is disposed opposite or adjacent to the induction coil in the radially extending direction of the light tube.

11. The method as claimed in claim 10, wherein disposing the magnetic object opposite or adjacent to the induction coil includes inserting the end cap into the induction coil;

and

the end cap and the light tube are moved away from the induction coil when the adhering process is complete.

12. The method as claimed in claim 10, disposing the magnetic object opposite or adjacent to the induction coil includes moving the induction coil to encompass the end cap;

and

the induction coil is moved away from the end cap when adhering process is complete.

13. The method as claimed in claim 9, wherein the magnetic object is iron powder, nickel powder or iron-nickel powder directly doped into the hot melt adhesive.

14. The method as claimed in claim 9, wherein the magnetic object in the coated hot melt adhesive forms a closed loop.