Invention Grant
- Patent Title: Vibration driving device, apparatus equipped with vibration driving device, control device and control method for vibration actuator
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Application No.: US17345792Application Date: 2021-06-11
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Publication No.: US11611294B2Publication Date: 2023-03-21
- Inventor: Hiromitsu Morita
- Applicant: CANON KABUSHIKI KAISHA
- Applicant Address: JP Tokyo
- Assignee: CANON KABUSHIKI KAISHA
- Current Assignee: CANON KABUSHIKI KAISHA
- Current Assignee Address: JP Tokyo
- Agency: Venable LLP
- Priority: JPJP2020-105643 20200618
- Main IPC: H02N2/06
- IPC: H02N2/06 ; G02B21/24 ; G02B26/08

Abstract:
A vibration driving device that improves controllability in low speed driving. The vibration driving device includes a vibration actuator that includes a vibrator that has an elastic member and an electro-mechanical energy conversion element, a contact member that contacts the vibrator, and a control device that controls drive of the vibration actuator. The control device includes a speed detection unit that detects speed information showing relative speed of the vibrator and the contact member, and an adjustment unit that decreases amplitude of vibration excited in the vibrator in a case where the speed detection unit detects that a state where the vibration actuator does not operate approximately and a state where the vibration actuator operates at a speed faster than a target driving speed occur alternately after starting to drive the vibration actuator.
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