Spark plug having noble metal tip

Details Spark plug having noble metal tip Spark plug having noble metal tip

2007-08-01

2010-12-07

Won, Bumsuk (Department: 2889)

Electric lamp and discharge devices

Spark plugs

Particular electrode structure or spacing

C313S142000, C313S143000, C123S1690EL

Reexamination Certificate

active

07847472

ABSTRACT:
A spark plug including: a center electrode; an insulator which holds the center electrode therein in a state where a tip end portion of the center electrode protrudes therefrom; a metal shell which holds the insulator therein; a ground electrode which is fixed to the metal shell, the ground electrode having an inner side face having a width that is smaller as it advances toward a tip end side, in a portion of the inner side face positioned between a pair of tapered faces; and a discharge portion which is bonded to the inner side face of the ground electrode by laser welding so as to attain a diameter of 0.8 mm or less and a height of 0.5 mm or more, and a discharge gap being formed between the discharge portion and the tip end portion of said center electrode.

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Japanese Office Action dated Jun. 24, 2008.

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