Patent ID: 6947697
Filing Date: 2005-09-20
Classification: B06B,G03G

Abstract:
1. An ultrasonic vibration tool comprising: a block of substantially rectangular parallelepiped form, the block including a longitudinal side face, an end face formed as an output end face, and another end face opposite the output end face formed as an input end face, said input face having a central portion; an ultrasonic vibration source connected to said central portion of the input end face; mass portions, said mass portions being formed on said longitudinal side face of said block, said mass portions being located at peripheries of said output and input end faces of said block; at least three slits, said slits being formed between said mass portions for defining a plurality of elastic portions, said slits being spaced at a pitch which is equal to or less than a quarter of an oscillation wavelength; protrusions, said protrusions protruding from said mass portions on said input face, said protrusion having a height equal to or less than a quarter of the oscillation wave length; and said height of said protrusions increasing with distance from said central portion, said protrusions forming a mass distribution in said mass portion that provides a uniform amplitude distribution in said output end face.