Structure of spark plug designed to provide higher...

Details Structure of spark plug designed to provide higher... Structure of spark plug designed to provide higher...

2005-02-08

2005-02-08

Williams, Joseph (Department: 2879)

Electric lamp and discharge devices

Spark plugs

Particular electrode structure or spacing

C313S143000, C313S118000

Reexamination Certificate

active

06853116

ABSTRACT:
An improved structure of a spark plug which provides higher durability and ignitability of a gaseous fuel. The spark plug consists of a center electrode, a ground electrode, a noble metal chip joined to a center electrode-opposed surface of the ground electrode by laser welding, and a fused portion that forms a weld of the noble metal chip and the ground electrode formed by materials of the ground electrode and the noble metal chip melted together. A sectional area of the noble metal chip traversing a length thereof is between 0.1 mm2and 0.6 mm2. An unfused sectional area percentage that is a percentage of a sectional area of an unfused portion of a joined end of the noble metal chip within a range of a sectional area of the noble metal chip closest to the fused portion traversing the length of the noble metal chip is less than or equal to 50%. A melt angle that is an angle which a line extending through the fused portion along a maximum depth of the fused portion makes with the center electrode-opposed surface of the ground electrode is less than or equal to 60°.

REFERENCES:
patent: 4109633 (1978-08-01), Mitsudo et al.
patent: 5811915 (1998-09-01), Abe et al.
patent: 5977695 (1999-11-01), Osamura et al.
patent: 6597089 (2003-07-01), Matsutani
patent: 0936710 (1999-08-01), None
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patent: 9-106880 (1997-04-01), None
patent: 11-354251 (1999-12-01), None
U.S. Appl. No. 09/324,860 (corres. to JP 11-354251).

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