Patent ID: 7230370
Filing Date: 2007-06-12
Classification: H01T

Abstract:
1. A spark plug comprising: an insulator having an axial hole in an axial direction of said spark plug; a center electrode disposed in a tip end side of said axial hole of said insulator; a metal shell surrounding said insulator; a first ground electrode including a first ground electrode body having one end joined to said metal shell, and a noble metal tip joined to an inner side face of another end portion of said first ground electrode body and disposed opposite a tip end face of said center electrode across a first discharge gap; and a second ground electrode having one end bonded to said metal shell, and another end disposed opposite a side peripheral face of said center electrode or a side peripheral face of said insulator across a second discharge gap, wherein a distance in an axial direction between an opposing face of said noble metal tip which opposes said tip end face of said center electrode, and said inner side face of said first ground electrode body is 0.3 mm or more, and in a virtual section which passes through a center of gravity of said second ground electrode and which contains an axis of said spark plug, an included angle θ between a virtual line s the virtual line s