Vibration actuator suitable for use in magnetic field environment and medical system
Abstract:
In a vibration actuator suitable for use in a magnetic field environment, vibration is excited in a vibration element in pressure contact with a driven element, so as to cause relative movement of the driven element and the vibration element. The vibration element includes an elastic body, of which a main ingredient is electrically insulating, dielectric, or semi-conductive, and an electromechanical energy conversion element. A first electrode having an open loop structure is provided on a surface of a piezoelectric body of the electromechanical energy conversion element, through which surface the piezoelectric body is joined to the elastic body. Second electrodes are provided on the piezoelectric body in a manner opposed to the first electrode via the piezoelectric body. A conduction path electrically connects the first electrode and at least one of the second electrodes. A gap is formed between each of adjacent second electrodes.
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