Measuring force control apparatus
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United States of America Patent
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Apr 24, 2012
Grant Date -
Apr 21, 2011
app pub date -
Oct 21, 2010
filing date -
Oct 21, 2009
priority date (Note) -
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status (Latency Note)
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Abstract
A position controller provided in a controlling module obtains a difference between a detected rotation angle of a stylus and a target rotation angle, and determines an energization amount to a voice coil motor so that the difference becomes zero. A variable limiter circuit limits a driving current, which is supplied from the position controller, to a limitation value so that a rotation force applied to the stylus from the voice coil motor is constant. A target rotation angle issuing portion switches over the target rotation angle based on a relative position of a contact portion of the stylus.
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