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Patent Searching and Data


Title:
SPARK PLUG
Document Type and Number:
WIPO Patent Application WO/2015/118581
Kind Code:
A1
Abstract:
In the present invention, radio-wave noise suppression and resistor longevity are improved, and a spark plug resistor includes an aggregate, a ZrO2-containing filler, and carbon. In a cross-section including an axis of the resistor, a rectangular region that, when the axis is taken as the center line, is 1800μm in the direction perpendicular to the axis, and is 2400μm in the direction of the axis, is taken as a target region. When the target region is divided into a plurality of square regions in which the length of a side is 200μm, a linear region composed of nine square regions aligned in the direction perpendicular to the axis, is taken as a linear region. When a square region having a ZrO2 surface area ratio of equal to or greater than 25% is taken as a first type of region, and a square region with a ZrO2 surface area ratio of less than 25% is taken as a second type of region, the total number of linear regions including two or more of the first type of regions is equal to or greater than five.

Inventors:
YOSHIDA, Haruki (C/O NGK SPARK PLUG CO. LTD, 14-18,Takatsuji-cho, Mizuho-ku, Nagoya-sh, Aichi 25, 〒4678525, JP)
KITA, Jumpei (C/O NGK SPARK PLUG CO. LTD, 14-18,Takatsuji-cho, Mizuho-ku, Nagoya-sh, Aichi 25, 〒4678525, JP)
IWASAKI, Yoshitomo (C/O NGK SPARK PLUG CO. LTD, 14-18,Takatsuji-cho, Mizuho-ku, Nagoya-sh, Aichi 25, 〒4678525, JP)
HONDA, Toshitaka (C/O NGK SPARK PLUG CO. LTD, 14-18,Takatsuji-cho, Mizuho-ku, Nagoya-sh, Aichi 25, 〒4678525, JP)
Application Number:
JP2014/002900
Publication Date:
August 13, 2015
Filing Date:
June 02, 2014
Export Citation:
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Assignee:
NGK SPARK PLUG CO., LTD. (14-18, Takatsuji-cho Mizuho-ku, Nagoya-sh, Aichi 25, 〒4678525, JP)
International Classes:
H01T13/20
Domestic Patent References:
WO2009154070A12009-12-23
Foreign References:
JPS6139386A1986-02-25
JP2005327743A2005-11-24
Other References:
See also references of EP 3104475A4
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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