| 摘要 |
A vibration drive device giving an appropriate click feeling when an operation member driven by a vibration actuator is manually operated. A controller applies, to a piezoelectric element, a drive signal for exciting, in an elastic body joined to the piezoelectric element, only a first vibration perpendicular to a contact surface between the elastic body and a driven element, or the first vibration and a second vibration parallel to the contact surface. When the position of the operation member is outside a driving section, only the first vibration is excited, whereas when within the driving section, the first vibration and the second vibration are excited so as to make the position closer to a target position set within the driving section. Application of the drive signal is stopped when the position is in a section in the driving section for a predetermined time period. |
| 主权项 |
1. A vibration drive device comprising:
a vibration actuator including: a vibration element including an electromechanical energy conversion element, and an elastic body joined to said electromechanical energy conversion element, and a driven element that is in pressure contact with said elastic body; a position detection unit configured to detect a relative position between said vibration element and said driven element; and a controller that applies a drive signal for exciting only a first vibration in a direction perpendicular to a contact surface between said elastic body and said driven element, or the first vibration and a second vibration parallel to the contact surface in said elastic body, to said electromechanical energy conversion element, wherein in a case where the relative position is outside a first section, said controller excites only the first vibration in said elastic body by the drive signal, whereas in a case where the relative position is within the first section, said controller excites the first vibration and the second vibration in said elastic body by the drive signal so as to make the relative position closer to a target position set within the first section, wherein the first section includes a second section including the target position, and wherein said controller stops applying the drive signal to said electromechanical energy conversion element, when the relative position is within the second section for a predetermined time period including zero time period. |
