VIBRATION MOTOR CONTROLLER, LENS APPARATUS INCLUDING THE SAME, AND IMAGE PICKUP APPARATUS INCLUDING THE SAME

摘要

A vibration motor controller configured to cause a vibrating member in which a vibration is excited based on two frequency signals having a phase difference to move relatively to a contact member, the vibration motor controller including: a memory configured to store a speed characteristic of the vibrating member with respect to a frequency of the two frequency signals; a controller configured to control a speed of the vibrating member by changing the frequency and/or a phase difference of the two frequency signals; a detector configured to detect the speed; and a changing unit configured to acquire change amount and change direction of the speed characteristic based on comparison between the speed detected by the detector and the speed characteristic stored in the memory, and change an activation frequency being a start point of control conducted by the controller based on the change amount and the change direction.

主权项

1. A vibration motor controller, configured to control a vibration motor configured to cause a vibrating member in which a vibration is excited based on two frequency signals having a phase difference to move relatively to a contact member brought into contact with the vibrating member, the vibration motor controller comprising:
a memory configured to store a speed characteristic of the vibrating member with respect to a frequency of the two frequency signals; a controller configured to control a speed of the vibrating member by changing at least one of the frequency and a phase difference of the two frequency signals; a detector configured to detect the speed; and a changing unit configured to acquire a change amount and a change direction of the speed characteristic based on a comparison between the speed detected by the detector and the speed characteristic stored in the memory, and change an activation frequency being a start point of control conducted by the controller based on the change amount and the change direction.