Spark plug with noble metal chip joined by unique laser...

Details Spark plug with noble metal chip joined by unique laser... Spark plug with noble metal chip joined by unique laser...

2007-12-11

2007-12-11

Williams, Joseph (Department: 2879)

Electric lamp or space discharge component or device manufacturi

Process

Spark plug or spark gap making

C313S143000, C029S03300H, C219S121600

Reexamination Certificate

active

11700149

ABSTRACT:
A spark plug is provided which ensures the reliability of a weld between a noble metal chip and a ground electrode as well as higher durability and ignitability of fuel. The ground electrode is joined to a metal shell, after which the noble metal chip is laser-welded to the ground electrode. The laser welding is achieved by emitting laser beams around an interface between the noble metal chip and the ground electrode outside a given angular range within which the metal shell will be an obstruction to the traveling of the laser beams. Specifically, the laser beams are emitted without any optical interference with the metal shell. This permits the angle between the orientation of each of the laser beams and the surface of the ground electrode to be minimized regardless of the metal shell, thus ensuring a desired depth of the fused portions in the noble metal chip.

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patent: 6595818 (2003-07-01), Uchara
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French Preliminary Search Report dated Aug. 8, 2006 issued in counterpart French application No. 04/08407.
Japanese Office Action dated May 8, 2007 issued in corresponding Japanese Application No. 2003-282873 with English translation.

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