Vibration-type actuator and optical device using the same

An optical device comprising:

• a lens;
• and
• a vibration-type linear actuator comprising:
• a drive unit having an electro-mechanical energy conversion element and a vibration body including a first projection;
• a driven body in pressure contact with the first projection;
• a pressurizing unit configured to apply a pressure force between the first projection and the driven body, the pressurizing unit comprising:
• a pressurizing member;
• and
• a transfer unit configured to transfer the pressure force occurring in the pressurizing member to the vibration body,
• wherein the vibration body and the driven body are configured to change a relative position of the first projection and the driven body by vibration occurring in the vibration body when a drive voltage is applied to the electro-mechanical energy conversion element,
• wherein the transfer unit is disposed between the electro-mechanical energy conversion element and the pressurizing member while being in contact with both of the pressurizing member and one surface of the electro-mechanical energy conversion element, the one surface being opposite to a surface on which the vibration body is arranged, and
• wherein, in a direction that intersects perpendicularly with a relative moving direction of the vibration body and the driven body and that intersects perpendicularly with a pressurizing direction by the pressurizing unit, a length of an area in which the first projection is in contact with the driven body is shorter than a length of an area in which the pressurizing member is in contact with the transfer unit.