Ultrasonic motor with a vibrating body and a moving body driven thereby

An ultrasonic motor, comprising:

• a moving body;
• and
• a vibrating body, said moving body being pressed against said vibrating body for movement of said moving body in a direction of movement by the friction force between said moving body and said vibrating body when said vibrating body is excited to generate a progressive wave of flexural vibration therein;
• wherein said vibrating body comprises a piezoelectric body bonded to an elastic base board;
• wherein said moving body comprises a reinforced resin composite material reinforced with at least carbon fiber and provides elasticity corresponding to the applied pressure in a direction of force of said moving body, said elasticity being provided through said moving body including a beam extending in the direction of movement of said moving body, said beam having lateral ends thereof, two first projections projecting upwardly from respective said lateral ends of said beam and defining a pressure receiving surface, and a second projection projecting downwardly from said beam toward said vibrating body and defining a sliding contact surface for contact with said vibrating body;
• and
• wherein said second projection has a width W.sub.1 set within a range of 0.3 mm.ltoreq.W.sub.1 .ltoreq.2.0 mm.

An ultrasonic motor, comprising:

• a moving body;
• and
• a vibrating body, said moving body being pressed against said vibrating body for movement of said moving body in a direction of movement by the friction force between said moving body and said vibrating body when said vibrating body is excited to generate a progressive wave of flexural vibration therein;
• wherein said vibrating body comprises a piezoelectric body bonded to an elastic base board;
• wherein said moving body comprises a reinforced resin composite material reinforced with at least carbon fiber and provides elasticity corresponding to the applied pressure in a direction of force of said moving body, said elasticity being provided through said moving body including a beam having lateral ends thereof, a first projection projecting upwardly from one said lateral end and defining a pressure receiving surface, and a second projection projecting downwardly from the other said lateral end toward said vibrating body and defining a sliding contact surface for contact with said vibrating body;
• and
• wherein said beam has a width L and a thickness T, said second projection has a width W.sub.2 and a height H, L/T<2, H/L.ltoreq.2 and 0.3 mm.ltoreq.W.sub.2 .ltoreq.2.0 mm.