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    • 8. 发明公开
    • DUST REMOVAL APPARATUS AND IMAGE PICKUP APPARATUS
    • ENTSTAUBUNGSVORRICHTUNG UND BILDAUFNAHMEVORRICHTUNG
    • EP2933996A1
    • 2015-10-21
    • EP15000957.9
    • 2015-04-02
    • Canon Kabushiki Kaisha
    • Shimizu, YasushiTakeda, KenichiIfuku, ToshihiroKubota, MakotoHayashi, JumpeiFuruta, TatsuoMatsushima, Kazuki
    • H04N5/217H04N5/225
    • H04N5/2171H04N5/2251H04N5/2253H04N5/2254
    • A dust removal apparatus includes a vibrating plate (410), a piezoelectric element (430), a power supply (42) that applies the piezoelectric element with an alternating voltage; and a control circuit (10) that changes a frequency of the alternating voltage, in which the piezoelectric element includes first and second electrodes and a piezoelectric material, a phase transition temperature T from a first crystal phase to a second crystal phase of the piezoelectric material is -40°C ≤ T ≤ 85°C, the change of the frequency is for repeating a sweep operation from a first frequency to a second frequency, and when a frequency at which an audible vibration is generated during the sweep operation is set as fns, a frequency at which this vibration is ended is set as fne, and a changing time from fns to fne during the sweep operation is set as Δtn, Δtn ≤ 10 ms is satisfied.
    • 除尘装置包括振动板(410),压电元件(430),施加具有交流电压的压电元件的电源(42); 以及控制电路(10),其将压电元件包括​​第一和第二电极和压电材料的交变电压的频率,从压电材料的第一晶相到第二结晶相的相变温度T 在-40°C‰¤¤85°C时,频率的变化是用于重复从第一频率到第二频率的扫描操作,并且当在扫描操作期间产生可听见的振动的频率是 设置为fns,将该振动结束的频率设定为fne,并且在扫描操作期间从fns到fne的改变时间被设置为“tn”,满足10ns。