| 摘要 |
<p>An actuator (34) comprises: an electro-mechanical conversion element (42); a driving frictional member (44) mounted onto one side in an extension/contraction direction of the electro-mechanical conversion element; a driven member (46) frictionally engaged with the driving frictional member; an urging section that urges the driven member to frictionally engage the driven member with the driving frictional member; and an urging force adjusting section that adjusts an urging force of the urging section.
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