A centrally positioned cylindrical Neodymium magnet that has opposing magnetic poles, radially disposed on either side of a rotational axis extending along the length of the cylindrical magnet and is centered within a central opening of rectangular coil, where it is free to rotate about its axis in either direction. At least one focus magnet (typically a small disk magnet) having axially opposing magnetic poles, each being arrange across each side substantially along a line parallel to the rotational axis of the cylindrical magnet within the frame, to cause the cylindrical magnet's field to be pulled into a more concentrated alignment so that more moving magnetic field lines from the cylindrical magnet can cut through the coil windings when the cylindrical magnet is rotated by an externally applied force.

A centrally positioned cylindrical Neodymium magnet that has opposing magnetic poles, radially disposed on either side of a rotational axis extending along the length of the cylindrical magnet and is centered within a central opening of rectangular coil, where it is free to rotate about its axis in either direction. At least one focus magnet (typically a small disk magnet) having axially opposing magnetic poles, each being arrange across each side substantially along a line parallel to the rotational axis of the cylindrical magnet within the frame, to cause the cylindrical magnet's field to be pulled into a more concentrated alignment so that more moving magnetic field lines from the cylindrical magnet can cut through the coil windings when the cylindrical magnet is rotated by an externally applied force.

A mobile terminal can include a case, a touch screen, a haptic module to generate vibration, a memory storing data, and a power supply unit. The haptic module may be a linear vibration motor including a housing, a coil, a moving portion, first and second elastic members; the housing includes an inner space defined by top and bottom surfaces, and first to fourth side surfaces; the coil, moving portion, and first and second elastic members are in the housing; the first and third side surfaces are spaced apart from the moving portion; the moving portion includes a magnet, first and second insertion grooves; the first and second elastic members are coil springs, the first and second elastic members are between the moving portion and the first third side surfaces, respectively; and one end of each coil spring is located at the first and second insertion grooves of the moving portion.

An electromagnetic haptic actuator comprises a first planar magnetic layer and a second planar magnetic layer. The first planar magnetic layer comprises a first substrate and a first planar conductive coil formed on the first substrate. The second planar magnetic layer comprises a planar magnet and spaced adjacent to the first planar magnetic layer with a gap in between the first planar magnetic layer and second planar magnetic layer. At least one of the first and second planar magnetic layers is flexible such that a portion of the first planar magnetic layer and a portion of the second planar magnetic layers are movable relative to each other.

Disclosed is an electromechanical generator for converting mechanical vibrational energy into electrical energy, the electromechanical generator comprising: a mass resiliently connected to a body by a biasing device and adapted to oscillate about an equilibrium point relative to the body with an oscillation amplitude, a transducer configured to convert oscillations of the mass about the equilibrium point relative to the body into electrical energy, and a resilient device disposed between the biasing device and one of the mass and the body, wherein the resilient device is configured to be deformed between the biasing device and the one of the mass and the body only when the oscillation amplitude exceeds a predetermined non-zero threshold amplitude. The resilient device may comprise one of a helical spring, an O-ring and a spring washer, such as a Belleville washer, a curved disc spring, a wave washer, and a split washer.

Disclosed is an electromechanical generator for converting mechanical vibrational energy into electrical energy, the electromechanical generator comprising: a mass resiliently connected to a body by a biasing device and adapted to oscillate about an equilibrium point relative to the body with an oscillation amplitude, a transducer configured to convert oscillations of the mass about the equilibrium point relative to the body into electrical energy, and a resilient device disposed between the biasing device and one of the mass and the body, wherein the resilient device is configured to be deformed between the biasing device and the one of the mass and the body only when the oscillation amplitude exceeds a predetermined non-zero threshold amplitude. The resilient device may comprise one of a helical spring, an O-ring and a spring washer, such as a Belleville washer, a curved disc spring, a wave washer, and a split washer.

A device for recovering or dampening vibratory energy from a mechanical resonator, comprising: an electrical generator comprising an element for converting mechanical vibration energy into electrical charges coupled to the resonator, the electrical generator periodically transferring a portion of the electrical charges from one terminal of the conversion element to the other; a frequency variation to phase variation conversion device, comprising an injection-locked oscillator of which the free-running oscillation frequency is equal to the resonance frequency of the resonator, and supplying to the electrical generator a control signal of frequency equal to that of the signal outputted by the conversion element and of which the phase shift depends on the difference between the frequency of the signal outputted by the conversion element and the resonance frequency of the resonator.

A power generation device includes a coil, a magnet, and a diaphragm. The magnet is provided at a position distant from the coil, having magnet pole faces facing a direction of the coil. The diaphragm vibrates upon receiving a sound wave, having either the coil or the magnet being placed. The diaphragm generates power by generating an electromotive force in the coil by a change in a magnetic field of the coil caused by changing a relative position of the coil and the magnet by vibration.

A vibration motor includes a stationary portion, a vibrating body, an elastic member, and a damper member. The elastic member includes a first extending portion, a second extending portion, a first connection portion, a second connection portion, a third extending portion, a fourth extending portion, a third connection portion, a fourth connection portion, and a fifth connection portion. The damper member includes a first longitudinal portion and a second longitudinal portion. An inner section including the first extending portion, the third extending portion, and the fifth connection portion directly opposes an upper surface of a weight in plan view in an up-down direction.

A VCM is disclosed, the VCM including a rotor including a bobbin arranged at an upper surface of a base formed with an opening, and a driving coil wound on the bobbin, a stator including a driving magnet opposite to the driving coil, and a yoke secured by the driving magnet at an inner surface of a lateral plate, and a tilting unit including a tilt magnet arranged at an outer surface of the lateral plate, a housing fixing the tilt magnet, and a tilt coil unit opposite to the tilt magnet.