Patent ID: 7781949
Filing Date: 2010-08-24
Classification: H01T

Abstract:
1. A spark plug, comprising: a center electrode; an insulator having an axial bore that extends along an axial direction of the center electrode and that accommodates the center electrode therein; a metal shell surrounding the insulator in a radial direction so as to hold the insulator therein; and a ground electrode having one end bonded to the metal shell and a free end bent so that a side face of the ground electrode is located opposed to the center electrode, said ground electrode having a core material which extends through said ground electrode from one end of said ground electrode toward the free end of the ground electrode along a first direction, said core material defining a predetermined core profile outline when projected onto said side face, said core profile outline having a first segment, a second segment and a third segment, said first and second segments of said core profile each extending in said first direction and defining the lateral edges of said core material, and said third segment connecting said first segment to said second segment and generally defining an end of said core material, said third segment of said core profile outline having a first point thereon, said first point being disposed midway between the lateral sides of said ground electrode, wherein at least one side of said core profile outline extends toward said free end beyond said first point.