SPARK PLUG AND PROCESS FOR PRODUCING SAME

Title:

SPARK PLUG AND PROCESS FOR PRODUCING SAME

Document Type and Number:

WIPO Patent Application WO/2010/087076

Kind Code:

A1

Abstract:

A spark plug and a process for producing the plug, in which a deposit formed on a ground electrode by plating can be relatively easily removed without causing an increase in cost and ignition properties can be prevented from decreasing. The spark plug (1) comprises a base metal (3) and a ground electrode (27) constituted of a nickel alloy, at least the basal end part of the ground electrode (27) and the surface of the base metal (3) having a nickel deposit layer (28) comprising nickel as the major component. A nickel deposit film (41) formed on a ground electrode (27) is irradiated with laser light, etc., the area of the film (41) to be irradiated being the part of the ground electrode (27) which is to be bent and faces a center electrode (5). Thus, a layer (29) is formed in the part to be bent which faces the center electrode (5), through the melting of a metallic component of the nickel deposit film (41) and of a metallic component of the ground electrode (27). A nickel deposit layer (28) is formed in the part of the ground electrode (27) which is other than the part irradiated with laser light, etc.

Inventors:

TAIDO AKIKAZU (JP)
KATO TOMOAKI (JP)

Application Number:

PCT/JP2009/070723

Publication Date:

August 05, 2010

Filing Date:

December 11, 2009

Export Citation:

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Assignee:

NGK SPARK PLUG CO (JP)
TAIDO AKIKAZU (JP)
KATO TOMOAKI (JP)

International Classes:

H01T13/20; C25D5/26; C25D7/00; H01T13/39

Foreign References:

JP2005293954A	2005-10-20
JPH08236263A	1996-09-13
JPH0711409A	1995-01-13
JP2001068250A	2001-03-16
JP2006236906A	2006-09-07

Other References: