Patent ID: 7798595
Filing Date: 2010-09-21
Classification: B41J

Abstract:
1. A method of blowing a fuse element capable of being blown by passing an electric current therethrough, the fuse element being provided on a substrate for an ink jet printing head, the substrate having ejection energy generation means for generating ejection energy, a first layer made of a material with a lower melting point than that of the fuse element and formed over the fuse element, and a second layer made of a material with a higher melting point than that of the first layer and formed over the first layer, the method comprising the steps of: melting a part of the fuse element and gasifying a part of the first layer to form a hollow space by applying an electric current reaching a peak after rising with a moderate curve of a leading edge; and forming a hollow space in the second layer by continuing to apply the electric current to the fuse element after the fuse element has been melted.