Fused joint structure in a lamp tube and forming method therefor

Abstract

The invention provides a fused joint structure for a lamp, capable of obtaining stable high welding strength, reducing bad distortion and lack welding strength as well as bad welding through hole, and a method for manufacturing the same. The fused joint structure comprises a conductive member (5) made of high melting point metal, and a metallic foil (6), and is characterized in that the high melting point metal of the conductive member (5) is fused with the metallic foil (6) on an area where the metallic foil (6) is put together on a surface of the conductive member (5), and a circumferential edge of the concave portion of the metallic foil (6) is covered with the high melting point metal of the conductive member (5). Moreover, the method for manufacturing the fused joint structure is characterized in that a laser of more than 40MW/cm<2> energy is illuminated into the area where the metallic foil (6) is put together on a surface of the conductive member (5), from one side of the metallic foil (6) by a fiber laser device, to joint the conductive member (5) and the metallic foil (6).

Description

technical field [0001] The invention relates to a fusion bonding structure related to a lamp power supply structure and a manufacturing method thereof. Background technique [0002] Conventionally, in halogen lamps for OA, mercury lamps for liquid crystal projection light sources, and metal halide lamps for general lighting, internal leads and external leads are bonded via metal foil in the sealing part to ensure the airtightness of the light-emitting space inside the lamp. . When the internal wire and the external wire are bonded to the metal foil, for example, the OA is sealed by a pinch seal (pinch seal), and the bonding part of the metal foil and the internal wire of the halogen lamp is sealed by a shrink seal (shrink seal). Conventionally, resistance welding is used to join the metal foil and internal lead wires of mercury lamps used as light sources for projectors. [0003] However, in the resistance welding method, welding conditions fluctuate due to changes in weld...

AI Technical Summary

Problems solved by technology

[0007] However, the present inventors have found that when the lead rods and metal foils of the lamp electrodes are actually welded by YAG laser, as shown in FIG. The energy of welding causes the recrystallization of the weld nugget, and due to the heat shrinkage after welding, the grain boundary between the recrystallization part and the non-recrystallization part is easy to break, resulting in a very fragile weld, and welding peeling failure occurs

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