发明授权
US08896746B2 Driving circuit and method for voice coil motor with spring return
有权
具有弹簧复位功能的音圈电机的驱动电路及方法
- 专利标题: Driving circuit and method for voice coil motor with spring return
- 专利标题(中): 具有弹簧复位功能的音圈电机的驱动电路及方法
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申请号: US13206665申请日: 2011-08-10
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公开(公告)号: US08896746B2公开(公告)日: 2014-11-25
- 发明人: Tatsuya Ninomiya
- 申请人: Tatsuya Ninomiya
- 申请人地址: JP
- 专利权人: Rohm Co., Ltd.
- 当前专利权人: Rohm Co., Ltd.
- 当前专利权人地址: JP
- 代理机构: Cantor Colburn LLP
- 优先权: JP2010-181063 20100812
- 主分类号: H04N5/232
- IPC分类号: H04N5/232 ; H02P25/02
摘要:
A driving circuit drives a voice coil motor having a spring return mechanism. A driving current generating unit supplies, to a coil of the voice coil motor, a driving current that corresponds to an analog control signal. Waveform memory stores digital waveform data which indicates the time waveform of a driving current to be supplied to the voice coil motor. A predetermined frequency component is removed from the frequency components of the waveform data. A control unit reads out the waveform data from the waveform memory at a rate that corresponds to the resonance frequency of the voice coil motor, and outputs the waveform data thus read out as a digital code. A D/A converter converts a digital code into an analog control signal, and outputs the analog control signal to the driving current generating unit.
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