Driving apparatus that drives pan head apparatus, control method therefor, vibration-wave motor apparatus, and image pickup apparatus
AssigneeCanon Kabushiki Kaisha
InventorTakao Mori
Life of this patent
Estimating the term…
Abstract
The driving apparatus comprises a vibrating body which includes an electro-mechanical energy conversion device, and drives a vibration-wave motor which moves the vibrating body and a driven body relatively to each other. The electro-mechanical energy conversion device has sensor electrodes that output detecting signals corresponding to vibrations of the vibrating body. Based on the detecting signals, the driving apparatus determines a direction in which the vibrating body and the driven body are to be moved relatively to each other.
Claims10
A driving apparatus for driving a vibration-wave motor comprising a vibrating body including an electro-mechanical energy conversion device and a driven body pressed against the vibrating body and configured to move the driven body relatively to each other, wherein the electro-mechanical energy conversion device comprises driving electrodes that receive driving signals, and sensor electrodes that output detecting signals corresponding to vibrations of the vibrating body, the driving apparatus comprising:
- a determination unit configured to determine, based on the detecting signals, a direction in which the vibrating body and the driven body are to be moved relatively to each other;
- and
- a control unit configured to control the vibration-wave motor based on the driving signals, which correspond to a result of determination by the determination unit,
- wherein the determination unit determines slip direction when a slip occurs between the vibrating body and the driven body, in a state where the vibration-wave motor is at a standstill, and
- wherein the control unit is configured to control the vibration-wave motor so that the driven body is driven in the same direction as the slip direction to reduce the slip of the vibration-wave motor, in the state where a slip occurs between the vibrating body and the driven body.
A driving method of driving a vibration-wave motor comprising a vibrating body including an electro-mechanical energy conversion device and a driven body pressed against the vibrating body and configured to move the driven body relatively to each other, wherein the electro-mechanical energy conversion device comprises driving electrodes that receive driving signal, and sensor electrodes that output detecting signals corresponding to vibrations of the vibrating body, the driving method comprising:
- determining, based on the detecting signals, a direction in which the vibrating body and the driven body are to be moved relatively to each other;
- controlling the vibration-wave motor based on the driving signals, which correspond to a result of determination by the determining;
- determining a slip direction, in a state where a slip occurs between the vibrating body and the driven body, while in a state where the vibration-wave motor is at a standstill;
- and
- controlling the vibration-wave motor so that the driven body is driven in the same direction as the slip direction to reduce the slip of the vibration-wave motor, in the state where the slip occurs between the vibrating body and the driven body.
A vibration-wave motor apparatus comprising:
- a vibration-wave motor comprising:
- a vibrating body including an electro-mechanical energy conversion device;
- and
- a driven body pressed against the vibrating body and configured to move the driven body relatively to each other,
- wherein the electro-mechanical energy conversion device comprises driving electrodes that receive driving signals, and sensor electrodes that output detecting signals corresponding to vibrations of the vibrating body;
- and
- a driving apparatus that drives the vibration-wave motor, and comprising:
- a determination unit configured to determine, based on the detecting signals, a direction in which the vibrating body and the driven body are to be moved relatively to each other;
- and
- a control unit configured to control the vibration-wave motor based on the driving signals, which correspond to a result of determination by the determination unit,
- wherein the determination unit determines a slip direction, in a state where a slip occurs between the vibrating body and the driven body, while in a state where the vibration-wave motor is at a standstill, and
- wherein the control unit is configured to control the vibration-wave motor so that the driven body is driven in the same direction as the slip direction to reduce the slip of the vibration-wave motor, in the state where the slip occurs between the vibrating body and the driven body.
Dependencies are inferred from the claim text.