Patent ID: 7163162

Claim:
A fuel injection valve, which comprises: a valve seat disposed in the vicinity of a fuel injection hole; a valve element that sits on or lifts from said valve seat to close or open a fuel path; a linked movable member installed on said valve element in a manner such that said linked movable member can slide in an axial direction of said valve element and can contact with or separate from said valve element; a spring to press said valve element to said valve seat via said linked movable member; and an attracting means to attract said valve element to separate from said valve seat against said spring, wherein said valve element and said linked movable element are disposed in a manner such that they can mutually contact through a flat-ring-shaped leaf spring or can separate from each other; wherein an outer edge of said leaf spring is secured to said valve element; wherein said linked movable member is arranged in a manner such that an end part of said linked movable member touches to an inner bore of said leaf spring; and wherein a natural frequency of a secondary oscillation system comprised of said linked movable member and said leaf spring is set at such a value that said natural frequency substantially accords with a frequency of an impact force caused from a collision of said valve element with said valve seat.