A vibration generator including a coil, a plunger including a first shaft and a second shaft, and a frame. The first shaft is received in the coil such as to be movable in a first direction. The second shaft extends in a second direction orthogonal to the first direction, is disposed on the other side in the first direction relative to the coil with a gap therebetween. The first and second shafts are partly made of a magnetic material so as to be magnetically attractable to the coil and thereby movable to one side in the first direction. The frame is fixed to the first and second shafts at positions on the one and other sides, respectively, in the first direction relative to the coil, and elastically deformable at least partly as a result of movement of the first and second shafts.

A brushless electromagnetic suspension vibration motor with swing rods and elastic pieces is provided. A stator coil and a stator are respectively fixedly arranged inside a coil fixing base, elastic pieces are arranged on both sides of a bottom corner support, top ends of the elastic pieces are connected with an elastic piece connecting seat, the swing rods are arranged inside a through groove, bottom ends of the swing rods are fixedly connected with movers. According to the principle of magnetic induction, after the positive and negative alternating current is passed into the magnetic induction coil, under the action of the stator, the movers are urged to move back and forth in a staggered manner. When the movers move, parts above the movers are driven to follow the movement, thereby causing the elastic pieces to deform and swing back and forth.

A brushless electromagnetic suspension vibration motor with swing rods and elastic pieces is provided. A stator coil and a stator are respectively fixedly arranged inside a coil fixing base, elastic pieces are arranged on both sides of a bottom corner support, top ends of the elastic pieces are connected with an elastic piece connecting seat, the swing rods are arranged inside a through groove, bottom ends of the swing rods are fixedly connected with movers. According to the principle of magnetic induction, after the positive and negative alternating current is passed into the magnetic induction coil, under the action of the stator, the movers are urged to move back and forth in a staggered manner. When the movers move, parts above the movers are driven to follow the movement, thereby causing the elastic pieces to deform and swing back and forth.

Provided is a vibration actuator that includes: a coil; a core around which the coil is wound, the core including both ends projecting from the coil; a yoke formed of a magnetic material and disposed opposite to the both ends of the core at a position adjacent to the both ends of the core with a gap provided between the yoke and the both ends of the core in a direction orthogonal to a winding axis of the coil; and an elastic part fixed between the core and the yoke and configured for elastic support to enable a movement between the core and the yoke in a direction opposite to at least one of the both ends of the core.

Provided is a vibration actuator that includes: a base part having a plate shape on which an electromagnet having a plate shape and including a core and a coil is disposed; a movable part including a magnetic yoke having a plate shape and disposed with a gap from the electromagnet in a thickness direction of the electromagnet; and an elastic body configured to support the magnetic yoke at the base part such that when the electromagnet is energized the magnetic yoke comes closer to the base part in the thickness direction, wherein the movable part has a shape configured to accommodate a part of the coil at a position facing the coil.

A driving circuit for driving a resonant device includes a voltage sensor, a signal controller, a signal generator and a driver. The voltage sensor, coupled to the resonant device, is configured to detect a back electromotive force (EMF) of the resonant device. The signal controller, coupled to the voltage sensor, is configured to control the length of an operation period of the driving circuit according to the back EMF. The signal generator, coupled to the signal controller, is configured to generate a driving signal corresponding to the length of the operation period. The driver, coupled to the signal generator, is configured to output the driving signal to the resonant device.