发明名称 |
DEVICE FOR DRIVING PIEZO-ACTUATOR AND DRIVING METHOD THEREFOR |
摘要 |
A device for driving a piezo-actuator comprises: a signal generating unit for generating signals having a constant frequency; and a modulation unit for modulating the signals generated from the signal generating unit and outputting the modulated signals, wherein the modulation unit comprises a density modulation unit which performs a first mode for repeating an operation for outputting an input signal at a first constant number and an operation for blocking the input signal at a second constant number, and which performs a second mode for repeating an operation for outputting the input signal during a first period and an operation for blocking the input signal during a second period. The device for driving the piezo-actuator and the method therefor can reduce the noise generated when the piezo-actuator for an automatic focus function of a camera is driven. |
申请公布号 |
US2015091476(A1) |
申请公布日期 |
2015.04.02 |
申请号 |
US201314381297 |
申请日期 |
2013.03.11 |
申请人 |
SNA CO., LTD. |
发明人 |
Kwon Kyoungsoo;Go Chaedong;Do Hyunwoo |
分类号 |
H02N2/00 |
主分类号 |
H02N2/00 |
代理机构 |
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代理人 |
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主权项 |
1. A device for driving a piezoelectric actuator, comprising:
a signal generation unit for generating a signal having a certain frequency; and a modulation unit for modulating and outputting the signal generated by the signal generation unit, wherein the modulation unit comprises a density modulation unit for executing a first mode in which an operation of outputting as many input signals as a first predetermined number and an operation of blocking as many input signals as a second predetermined number are repeated, or a second mode in which an operation of outputting input signals for a first interval and an operation of blocking the input signals for a second interval are repeated. |
地址 |
Yongin-si KR |