Invention Grant

Spark plug
Abstract:
In a spark plug, at a cross section of a ground electrode which is orthogonal to a longitudinal direction of an electrode base material and passes an axis of an electrode tip, a surface of the base material is exposed, and the following conditions are satisfied: 1.2E≦F≦1.9E; 0.05 mm≦Da≦0.30 mm; 0.05 mm≦Db≦0.30 mm; and 0.20 mm≦J≦0.70 mm2.
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