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Patent Searching and Data

Document Type and Number:
WIPO Patent Application WO/2015/098007
Kind Code:
Provided is a spark plug having an extended life. A spark plug is provided with: a first electrode; and a second electrode having an electrode tip which forms a gap between the electrode tip and the first electrode, the second electrode also having an electrode base material to which the electrode tip is joined. The electrode tip has a flat surface located at a distance from the electrode base material and is joined at the back surface thereof, the back surface being the surface on the reverse side of the flat surface, to the electrode base material by laser welding in which laser light enters in the flat surface direction extending from one end of the flat surface toward the other end. A weld section is formed by the laser welding on the back surface side of the electrode tip. The shape of a cross-section of the weld section cut by a plane which is perpendicular to the flat surface and which is parallel to the flat surface direction has a constricted section at a position along the length of the weld section from one side in the flat surface direction toward the other side.

SUZUKI, Kaori (C/O NGK SPARK PLUG CO. LTD, 14-18,Takatsuji-cho, Mizuho-ku, Nagoya-sh, Aichi 25, 〒4678525, JP)
Application Number:
Publication Date:
July 02, 2015
Filing Date:
December 08, 2014
Export Citation:
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NGK SPARK PLUG CO., LTD. (14-18, Takatsuji-cho Mizuho-ku, Nagoya-sh, Aichi 25, 〒4678525, JP)
International Classes:
Domestic Patent References:
Foreign References:
Other References:
See also references of EP 3089289A4
Attorney, Agent or Firm:
AOKI, Noboru et al. (C/O NGK SPARK PLUG CO. LTD, 2808 Oaza-Iwasaki, Komaki-sh, Aichi 10, 〒4858510, JP)
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