Spark plug having a specific structure of noble metal tip on...

Details Spark plug having a specific structure of noble metal tip on... Spark plug having a specific structure of noble metal tip on...

2007-11-06

2007-11-06

Williams, Joseph (Department: 2879)

Electric lamp and discharge devices

Spark plugs

Particular electrode structure or spacing

C313S142000, C313S143000, C123S1690EL

Reexamination Certificate

active

10948465

ABSTRACT:
A method for producing a spark plug, the 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, a discharge gap being formed between the discharge portion and the tip end portion of said center electrode, the method including: forming the tapered faces before the discharge portion is laser-welded to the inner side face.

REFERENCES:
patent: 2002/0038992 (2002-04-01), Morita et al.
patent: 2002/0067111 (2002-06-01), Shibata et al.
patent: 2002/0105254 (2002-08-01), Hori et al.
patent: 2002/0121849 (2002-09-01), Kanao et al.
patent: 2003/0155849 (2003-08-01), Hori
patent: 2003/0193282 (2003-10-01), Shibata et al.
patent: 2004/0041506 (2004-03-01), Teramura et al.
patent: 2004/0061421 (2004-04-01), Morita et al.

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