Invention Grant
- Patent Title: Control apparatus and control method for vibration wave driven apparatus
- Patent Title (中): 振动波驱动装置的控制装置及控制方法
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Application No.: US12208059Application Date: 2008-09-10
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Publication No.: US07755251B2Publication Date: 2010-07-13
- Inventor: Shinya Kudo
- Applicant: Shinya Kudo
- Applicant Address: JP
- Assignee: Canon Kabushiki Kaisha
- Current Assignee: Canon Kabushiki Kaisha
- Current Assignee Address: JP
- Agency: Rossi, Kimms & McDowell LLP
- Priority: JP2007-236502 20070912; JP2008-206985 20080811
- Main IPC: H02N2/00
- IPC: H02N2/00 ; H01L41/09

Abstract:
A vibration wave driven apparatus capable of preventing a resonance frequency of a vibrator from being shifted to a frequency side higher than a fixed drive frequency of the vibrator during the execution of phase difference control or voltage control. Driving signals are supplied from a control apparatus to a vibration-type actuator having a piezoelectric element that functions as an electro-mechanical energy conversion element. To control the drive of the vibration-type actuator, either a phase difference between the driving signals or a voltage of the driving signals is changed. When either the phase difference or the driving signal voltage is changed, the frequency of the driving signals is set to a predetermined frequency higher than the frequency for use when neither the phase difference nor the driving signal voltage is changed.
Public/Granted literature
- US20090066187A1 CONTROL APPARATUS AND CONTROL METHOD FOR VIBRATION WAVE DRIVEN APPARATUS Public/Granted day:2009-03-12
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