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1. 发明授权

EP2933996B1 DUST REMOVAL APPARATUS AND IMAGE PICKUP APPARATUS 有权转让
公开(公告)号：EP2933996B1
公开(公告)日：2018-09-19
申请号：EP15000957.9
申请日：2015-04-02
申请人： Canon Kabushiki Kaisha
发明人： Shimizu, Yasushi , Takeda, Kenichi , Ifuku, Toshihiro , Kubota, Makoto , Hayashi, Jumpei , Furuta, Tatsuo , Matsushima, Kazuki
IPC分类号： H04N5/217 , H04N5/225
CPC分类号： H04N5/2171 , H04N5/2251 , H04N5/2253 , H04N5/2254
摘要： 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 ”tn, ”tn ‰¤ 10 ms is satisfied.

2. 发明公开

EP2933996A1 DUST REMOVAL APPARATUS AND IMAGE PICKUP APPARATUS 有权转让
标题翻译： ENTSTAUBUNGSVORRICHTUNG UND BILDAUFNAHMEVORRICHTUNG
公开(公告)号：EP2933996A1
公开(公告)日：2015-10-21
申请号：EP15000957.9
申请日：2015-04-02
申请人： Canon Kabushiki Kaisha
发明人： Shimizu, Yasushi , Takeda, Kenichi , Ifuku, Toshihiro , Kubota, Makoto , Hayashi, Jumpei , Furuta, Tatsuo , Matsushima, Kazuki
IPC分类号： H04N5/217 , H04N5/225
CPC分类号： H04N5/2171 , H04N5/2251 , H04N5/2253 , H04N5/2254
摘要： 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.
摘要翻译：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。

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