VCM control circuit
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United States of America Patent
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Jul 17, 2012
Grant Date -
Apr 23, 2009
app pub date -
Oct 20, 2008
filing date -
Oct 22, 2007
priority date (Note) -
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Abstract
A method of controlling a moving part of a voice coil motor to move from an first position to a second position, wherein the position of the moving part is controlled by the level of an electrical signal applied to a coil of the voice coil motor, a first level of the electrical signal corresponding to the first position, and a second level of the electrical signal corresponding to the second position, the method including: at a first time, changing the electrical signal from the first level to an intermediate level, the intermediate level being chosen such that a peak overshoot of the moving part corresponds to the second position; and at a second time calculated to correspond to a delay of half an oscillation period of the moving part after the first time, changing the electrical signal to the second level.
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