Patent ID: 8791623

Claim:
A piezoelectric actuator comprising: a plate-like piezoelectric element having an upper surface and a lower surface parallel to said upper surface of said element; a sheet having an upper surface and a lower surface parallel to said upper surface of said sheet; and a movable body, wherein, said plate-like piezoelectric element is provided to said sheet in such a manner that said upper surface of said plate-like piezoelectric element is parallel to said upper surface of said sheet; said sheet includes a movable body driving section formed on one of said upper surface of said sheet and said lower surface of said sheet; said movable body includes a contact section which contacts with said sheet at said movable body driving section; and said piezoelectric actuator is configured so as to move the movable body driving section in a direction parallel to said upper surface of said sheet by using expansion and contraction deformation of said plate-like piezoelectric element in a direction parallel to said upper surface of said plate-like piezoelectric element to thereby move said movable body through frictional force generated between said movable body driving section and said contact section.