A buzzer unit 4 includes a case 10, a vibrating element 11, and a pressing member 14. The case 10 includes a vibrating plate 28 in which no through-holes are formed. The case 10 includes a storage space 22 formed therein on the lower side X2 of the vibrating plate 28. The vibrating element 11 faces the vibrating plate 28 in the vertical direction X inside the storage space 22, produces vibration as a result of voltage being applied thereto, and as a result, causes the vibrating plate 28 to vibrate. The pressing member 14 is stored in the storage space 22, and presses the vibrating element 11 against the vibrating plate 28.

A vibration device that includes a vibration portion, a support portion connected to the vibration portion, a bending-vibrating portion connected to the support portion, and a frame-shaped base portion connected to the bending-vibration portion and disposed so as to surround the vibration portion. The base portion defines a slit that extends in a first direction crossing a second direction in which the support portion extends from the vibration portion, the slit defining first and second fixed ends of the bending-vibrating portion and which are continuous with the base portion. A length between a portion of the bending-vibrating portion connected to the support portion to one of the first and second fixed ends of the bending-vibrating portion is in a range of /8 to 3/8, where denotes a wavelength of a bending vibration corresponding to a frequency of a characteristic vibration of the vibration portion.

A vibration actuator includes a vibrator including a shaft, an output transmission member penetrated by the shaft, and configured to rotate about the axis of the shall, and a fixed member configured not to move relative to the shaft and configured to move relative to the output transmission member. The fixed member includes a base portion and a projection portion protruding from the base portion to the output transmission member side, the vibration actuator includes a pressure reception member between the base portion and the output transmission member in an axial direction of the shaft, and wherein the projection portion and the output transmission member are in contact with each other in a direction orthogonal to the axial direction of the shaft, and the projection portion and the output transmission member are not in contact with each other in the axial direction of the shaft.

A vibration wave actuator has a vibration member including an elastic member and an electro-mechanical energy transducer, and a contact member in contact with the vibration member, and the contact member and the vibration member move relative to each other. The vibration wave actuator includes a detected portion configured to move, together with the contact member, relative to the vibration member, and a detection unit configured to move, together with the vibration member, relative to the contact member to detect displacement information or position information for the detected portion. The vibration member has two projections provided side by side in a direction intersecting with the direction of the relative movement. The contact member contacts the two projections. The detection unit and the detected portion are located between the contact member and the vibration member when viewed from the direction of the relative movement.

A piezoelectric actuator includes a vibration portion, a support portion that is integrally configured with the vibration portion and supports the vibration portion, and a piezoelectric element that is disposed on the vibration portion. The piezoelectric element includes a piezoelectric film including columnar crystal grains extending in a thickness direction. When a thickness of the piezoelectric film is referred to as T [?m] and an average diameter of the crystal grains in the width direction is referred to as D [?m], T/D is within a range of 10 to 100. The thickness T of the piezoelectric film is larger than or equal to 2 ?m. A standard deviation of diameters of the crystal grains in the width direction is less than or equal to 1.8 ?m.

A motor includes a vibrator, a mover guided by a guide member to move with the vibrator, and rollers sandwiched between the mover and the guide member. The mover includes first and second groove shapes formed along a moving direction of the vibrator to separate from each other. The guide member includes first and second guide parts opposite to the first and second groove shapes, respectively. The rollers are sandwiched among the first and second groove shapes, and the first and second guide parts. On a rear side of a surface of the guide member where the first and second guide parts are formed, the mover includes regulating parts regulating a movement of the guide member to the rear side. When the guide member abuts against the regulating parts, part of each of the rolling balls is positioned inside the first and second groove shapes.

Included are a vibrator including a protruding portion that performs high frequency vibration; a friction member, the vibrator being pressed to cause the protruding portion to abut to the friction member; a fixing member to which either the vibrator or the friction member; a movable member that moves integratedly with either the vibrator or the friction member; a plurality of rotating members enabling relative movement between the friction member and the movable member; and a falling off restriction portion that prevents the rotating members provided in either the fixing member or the movable member from falling off, wherein the falling off restriction portion abuts to an opposed portion opposed to the falling off restriction portion to restrict a movable range of the movable member in a pressing direction and to prevent the rotating members from falling off.

A vibration actuator includes a vibrator including an electromechanical transducer and an elastic body, a vibrator fixing member configured to hold the vibrator, a driven member configured to come into frictional contact with the vibrator so as to move relative to the vibrator, a pressing portion configured to press the vibrator against the driven member, a guide portion configured to guide the vibrator in a direction in which the vibrator moves, and a vibration damping member disposed between the vibrator fixing member and the movable plate. The guide portion includes a movable plate configured to move integrally with the vibrator, a rolling member configured to roll in the direction in which the vibrator moves, and a press-and-hold member configured to press the rolling member against the movable plate.

Provided is a piezoelectric driving device for a motor including: a vibrating plate which includes a fixed portion and a vibrator portion in which a piezoelectric element is provided and which is supported by the fixed portion; and a contact portion which comes into contact with a driven body and transmits motion of the vibrating plate to the driven body, in which the fixed portion, the vibrator portion, and the contact portion are provided along an X direction in this order, when seen in a Y direction, when two directions parallel to a main surface of the vibrating plate and orthogonal to each other are set as the X direction and the Y direction and a direction orthogonal to the main surface of the vibrating plate is set as a Z direction.

A piezo actuator includes a piezo motor element having a top and a bottom surface, and a connection element having arms with flexure hinges for contacting the piezo motor element at different fixation positions located at node positions of a bending mode of the piezo motor element. The flexure hinges are such that the piezo motor element is allowed to move in the normal direction and the flexure hinges being stiff in the tangential direction, wherein the flexure arms are fixed to the piezo motor element with a fixation means.