Electromechanical drive element
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United States of America Patent
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Apr 24, 2007
Grant Date -
Aug 10, 2006
app pub date -
Feb 4, 2005
filing date -
Feb 4, 2005
priority date (Note) -
In Force
status (Latency Note)
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Abstract
In manufacturing electromechanical drive elements, vibration properties are defined in a test environment. These properties are found to give a good operation when being arranged in a motor. Two flexural vibration modes are defined. One is an s-mode connected to an element being strapped at two supports at respective outer portions. The s-mode have three nodal points. The other vibration mode is an .epsilon.-mode connected to an element being strapped at the supports and at a drive pad arranged at a middle portion. The .epsilon.-mode has one nodal point at each side of the middle portion and the middle portion has a stroke amplitude that is smaller than stroke amplitudes at portions between the middle portion and the nodal points. An average of the resonance frequencies of the s-mode strapped at two and three points, respectively, differs from and the .epsilon.-mode resonance frequency by less than 25%.
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