Vibration actuator and driving device for vibration actuator
AssigneeCanon Kabushiki Kaisha
InventorKenichi Kataoka
Life of this patent
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Abstract
A vibration actuator is capable of reducing differences in vibration phase and vibration amplitude without raising a voltage of a drive circuit when driving a contact member using a plurality of vibrators connected in series. The vibration actuator includes a vibrator device and a contact member that moves relative to the vibrator device. The vibrator device includes transformers of which primary coils are connected in series, and vibrators that are respectively connected in parallel to secondary coils of the transformers.
Claims17
A vibration actuator comprising:
- a vibrator device;
- and
- a contact member that moves relative to the vibrator device,
- wherein the vibrator device comprises:
- transformers of which primary coils are connected in series, and
- vibrators that are respectively connected in parallel to secondary coils of the transformers, and
- wherein the vibrators are arranged so as to drive the contact member to rotate or move linearly.
A driving device for a vibration actuator equipped with a vibrator device and a contact member that move relatively and mutually, the driving device comprising:
- a drive signal generator that generates an alternating voltage applied to the vibrator device;
- an amplitude detector that detects amplitude of an electric current flowing to the vibrator device;
- and
- a drive signal controller that controls the alternating voltage that the drive signal generator generates according to the amplitude of the electric current,
- wherein the vibrator device comprises:
- transformers of which primary coils are connected in series, and
- vibrators that are respectively connected in parallel to secondary coils of the transformers, and
- wherein the vibrators are arranged so as to drive the contact member to rotate or move linearly.
Dependencies are inferred from the claim text.