Abstract: An actuator may include a supporting body; a movable body; a first magnetic drive circuit; a second magnetic drive circuit. The first magnetic drive circuit may include a first coil and a first magnet. The second magnetic drive circuit may include a second coil and a second magnet. The actuator may further include a first yoke on a side of the first coil remote from the second coil; a second yoke on a side of the second coil remote from the first coil; and a third yoke between the first coil and the second coil. The first magnet may be held on a face of the first yoke or a face of the third yoke. The second magnet may be held on a face of the second yoke or a face of the third yoke. The third yoke may be thicker than the first and second yoke.

Abstract: The present disclosure provides a linear vibration motor, including a housing, a vibration unit, an elastic component, and a driving unit. the driving unit includes a first coil component and a second coil component that are disposed opposite to each other and spaced apart from each other, the vibration unit includes a first permanent magnet, two second permanent magnets, and two third permanent magnets, the first permanent magnet is disposed between the first coil component and the second coil component, the two second permanent magnets are disposed opposite to two ends of the first coil component, and the two third permanent magnets are disposed opposite to two ends of the second coil component. Compared with the related art, the vibration unit of the linear vibration motor provided in the present disclosure provides a greater driving force and a higher response speed during vibration.

Abstract: A linear actuator having an elastic injection-molded frame includes a yoke, a permanent magnet attached to a bottom surface of the yoke at a distance from a side surface of the yoke, a top plate attached to a top surface of the permanent magnet, a frame coupled to an outer periphery of the yoke and injection-molded with an elastic material, a protector disposed on the frame, and a coil secured to the protector, with a lower end positioned between the permanent magnet and the side surface of the yoke. The frame includes a yoke coupling portion coupled to the yoke, a fixing portion spaced apart from the yoke coupling portion and coupled to the protector, and two or more bridges for elastically connecting the yoke coupling portion and the fixing portion.

Abstract: A vibrator includes a frame, a swing unit, and an elastic member. The swing unit is disposed within the frame and holds a magnet. The elastic member connects the swing unit and the frame. The swing unit is movable with respect to the frame while deforming the elastic member. The frame, the swing unit, and the elastic member are integrally molded with each other.

Abstract: A vibration generation apparatus includes a casing, a magnet attached in the casing, a vibrator having a coil that vibrates in the casing, an elastic support member connected to the casing and holding the vibrator in the casing, and a flexible interconnect member. One end of the flexible interconnect member is connected to the electric wire of the coil, and the other end of the flexible interconnect member protrudes to the outside of the casing. The casing is provided with an opening through which the interconnect member passes, and the interconnect member is supported by a support in the casing.

Abstract: A cochlear implant including a cochlear lead, an antenna, a stimulation processor, and a magnet apparatus, associated with the antenna, including a case defining a central axis, a magnet frame within the case and rotatable about the central axis of the case, and a plurality of elongate diametrically magnetized magnets that are located in the magnet frame, the magnets defining a longitudinal axis and a N-S direction and being freely rotatable about the longitudinal axis relative to the magnet frame.

Abstract: A movable core-type reciprocating motor and a compressor having a movable core-type reciprocating motor are provided. The motor may include a stator including an inner stator and an outer stator; a magnet coil wound between the inner stator and the outer stator; a magnet fixed to at least one of the inner stator or the outer stator so as to be at least partially positioned within a range of the air gap; and a mover including at least one movable core disposed in the air gap and made of a magnetic material to perform a reciprocation movement with respect to the stator and the magnet and a connection member made of a non-magnetic material and configured to support the at least one movable core.

Abstract: Embodiments of the present invention provide a heat dissipation apparatus. Wherein a loop coil is disposed on a swing plate. A first magnet and a second magnet are located on two sides of the loop coil, and when a current whose direction periodically varies flows through the loop coil, an Ampere force whose direction periodically varies is applied to the loop coil under an action of a magnetic field formed by the first magnet and the second magnet, so that the loop coil drives the swing plate to swing back and forth. The present invention is used for heat dissipation of a micro electronic component.

Abstract: A vibrator includes a frame, a swing unit, and an elastic member. The swing unit is disposed within the frame and holds a magnet. The elastic member connects the swing unit and the frame. The swing unit is movable with respect to the frame while deforming the elastic member. The frame, the swing unit, and the elastic member are integrally molded with each other.

Abstract: A vibration motor is disclosed. The vibration motor includes a housing; an elastic connecting piece; a fixed component; a vibrating component comprising a counterweight suspended in the housing by the elastic connecting piece; and a damping piece accommodated in the housing and fixed on the counterweight. One of the fixed component and the vibrating component includes coils, and the other includes a magnet. The counterweight includes a restricting protrusion extending from a side facing the elastic connecting piece for abutting against and restricting the damping piece.

Abstract: A linear compressor is provided that may include a shell having a cylindrical shape, a frame fixed inside the shell, a cylinder inserted to pass through the frame, a piston provided in the cylinder, a motor that linearly reciprocates the piston, and a stator cover coupled to the motor. The stator cover may include a cover body and a reinforcement sleeve bent from an outer edge of the cover body, the reinforcement sleeve having a plurality of protrusions that protrudes in a radial direction from the reinforcement sleeve. A portion of the shell corresponding to a position of each of the plurality of protrusions includes a bulge that protrudes in the radial direction of the shell.

Abstract: The present invention relates to electric appliances for personal care, in particular electric shavers, comprising a magnetic linear drive unit having first and second drive components supported for linear displacement relative to each other by a spring device and adapted to magnetically interact with each other. Said spring device includes a ring element made in one piece from plastic including at least one pair of leaf springs and a pair of cross-bars extending crosswise to said leaf springs and connecting said leaf springs to each other.

Abstract: A linear vibration motor comprises: a motor housing, a stator, a vibrator, and at least two sets of elastic support assemblies for suspending the vibrator in the motor housing and for supporting the vibrator and providing an elastic restoring force. The elastic support assemblies are located between the inner wall of the motor housing and the vibrator, each set of the elastic support assemblies comprising at least two elastic supports. The elastic support comprises a first connection point fixedly connected to the vibrator and a second connection point fixedly connected to the inner wall of the motor housing. The second connection point is coupled to a side wall of the motor housing parallel to the vibration direction of the vibrator. The first connection point and the second connection point of the elastic support are located at the same side of the central axis of the vibrator parallel to the vibration direction of the transducer.

Abstract: A system includes a downhole acquisition tool housing that may receive a fluid that enters the downhole acquisition tool from a first flowline, a second flowline, or both. The system includes a flow control device removably coupled to the downhole acquisition tool. The flow control device may include a housing, a plurality of flow routing plugs that may be in fluid communication to the first flowline, the second flowline, or both, and channels disposed within the housing and fluidly coupled to the plurality of flow routing plugs.

Abstract: Provided are a lens driving motor and an elastic member of the lens driving motor. The elastic member of a lens driving motor, the elastic member includes a first spring and a second spring. The second spring is different from the first spring and disposed together with the first spring on one side of a carrier to support the carrier. A first lead line of a coil and a first external power source are connected to the first spring, and a second lead line of the coil and a second external power source are connected to the second spring to supply power to the coil. Since the carrier can be assembled to other part after a (+) lead line and a (?) lead line of the coil are connected to the first and second springs, respectively, using solder, a process is simple and convenient.

Abstract: The linear actuator comprises a double-chamber solenoid pump comprising at least one pump coil, a multi-way valve and at least one pump armature that can be moved by energizing the at least one pump coil and is provided with a switching armature by means of which the multi-way valve can be switched and which can be moved by energizing the at least one pump coil. In the method, both the switching armature and the pump armature are moved by energizing the pump coil.

Abstract: In accordance with one aspect of the present disclosure, an electronic device includes a housing, a contact member attached to the housing, and a vibration generating device. The vibration generating device is fixed to the contact member or the housing. A gap is formed between a surface of the vibration generating device facing the housing and a surface of the housing facing the vibration generating device.

Abstract: A muzzle-mounted chronograph for measuring velocities of projectiles launched from firearms. The chronograph includes a sensor module and a controller. The sensor module includes a first and second coils and a device for applying a stable magnetic field to the first and second coils. The controller determines a velocity of a projectile passing by the first and second coils based on detected variations in magnetic fields at the first and second coils.

Abstract: An oscillatory linear actuator includes an electromagnetic core block including an electromagnet (electromagnetic part), and a magnetic block that holds permanent magnets so that the permanent magnets face the electromagnet with a predetermined space in between. The electromagnetic core block integrally includes a core, a coil bobbin, and a base, the core and the coil bobbin forming the electromagnet, and the base holding the core and the coil bobbin. The magnetic block includes the permanent magnets and a frame that holds the permanent magnets so as to allow the permanent magnets to oscillate freely and holds the electromagnetic core block. The frame has a guide portion that guides the electromagnetic core block to adjust a positional relation of the permanent magnets and the electromagnet, and the base is fixed to the frame inside the guide portion.

Abstract: The invention provides the submersible pumping apparatus comprising, united in a single housing, a filtration system for the inlet of a wellbore fluid, a gravity gas separation system, a head for attachment to a tubing, a double action pump, a linear driven electric motor, a hydro-protector, and a telemetry system. The linear electric motor comprises a fixed part, a stator with a dielectric liquid which surrounds the stator, and a movable part being a slider, comprising several sections spaced-apart from the central axis of a stator housing along a diameter, and is configured to reciprocate along a longitudinal axis. The double action pump comprises two plungers; movable parts of the pump, plungers, are mechanically connected with the slider sections; fixed parts of the pump, cylinders, are arranged as follows: one cylinder is in the central part of the motor stator, and the second cylinder is in the inner part of the hydro-protector.

Abstract: A linear vibrator having a flexible printed circuit board including a copper film pattern processed in a meander line pattern and, more particularly, a linear vibrator for solving a frequency interference problem between an electromagnetic structure and antenna disposed within a mobile device using a flexible printed circuit board (FPCB) including a copper film pattern processed in a meander line pattern in the linear vibrator. The linear vibrator can avoid resonant frequency interference through the copper film pattern having a frequency region out of the resonant frequency region of an antenna within a mobile device by processing the copper film pattern unique to an FPCB used in a linear vibrator.

Abstract: A linear vibration motor has a movable element including a magnet and a weight, and an elastic member are inserted into a frame. The frame supports the movable element so the movable element can freely slide axially; a coil fixed to the frame and drives the magnet axially; and an elastic member applying, to the movable element, an elastic force against the driving force of the magnet. The frame has a bottom surface plate with a bottom surface affixing the coil; an upper surface plate has an upper surface opposing the bottom surface; and a front surface plate facing the axially and supports the elastic member. The bottom surface plate has partial side surface portions that are respectively bent from both side edges of the bottom surface portion and in which an opening is formed in a central part of the partial side surface portions in the axial direction.

Abstract: A linear vibration motor comprises: a movable element that comprises a magnet portion, a weight portion, and a yoke; a frame for enclosing the movable element; a coil, secured to the frame, for applying a driving force to the magnet portion so as to cause the movable element to undergo reciprocating vibration along the axial direction; and an elastic member for applying, to the movable element, an elastic force that repels the driving force that is applied to the magnet portion, wherein: a magnetic material portion (a magnetic material piece) that extend along the direction of vibration of the movable element is provided on an inner surface of the frame, and the yoke has a raised portion near the magnetic material portion (the magnetic material piece).

Abstract: An oscillatory actuator has: a fixed body that has a planar part and a flat coil disposed on the planar part; and a movable body that has a magnet facing the coil and oscillates in a reciprocating manner in one direction relative to the fixed body above the planar part via cooperation between the coil and the magnet. The fixed body has a pair of linear bearings that are respectively disposed along both side surfaces extending in said one direction of the movable body and are equipped with balls capable of rolling and coming into contact with the respective side surfaces. The movable body is supported via the balls of the linear bearings so as to be able to oscillate in said one direction.

Abstract: A sound generator system of a vehicle is provided. The system includes a housing with an interior space formed therein and a cover that encloses the housing. An exciter is inserted into the interior space and includes yokes and a magnetic. A coil is positioned adjacent to the exciter and vibrates the exciter when current is applied. A main shaft has a first end connected to the housing a second end penetrating the cover, exposed to an outside, and penetrated and installed in the exciter and the vibration generated by the exciter if finally output. An elastic portion is installed adjacent to the exciter and delivers the vibration to the main shaft to remove removing a horizontal directional driving force of the exciter and prevent the exciter from contacting other components and enhances a vertical directional driving force of the exciter.

Abstract: An oscillator typically includes a rotatable drive shaft, at least two pivot members which rotate with the drive shaft, at least one oscillating member which is pivotable back and forth in an oscillating manner and at least one rod mounted on the at least one oscillating member which is movable in response to rotational and pivotal movement of the at least two pivot members so as to cause the oscillating member to pivot back and forth in an oscillating manner. At least one rotatable drive wheel may drive rotatable movement of the drive shaft. A drive mechanism may be used to drive rotation of the at least one drive wheel. At least one generating magnet may be mounted on the oscillating member and movable adjacent an electrically conductive coil for producing an electric current therein.

Abstract: A force sense generator includes a rotatable circular plate having a rotation axis at a center of gravity; a motor that drives the circular plate to be rotated; a cam formed at a surface of the circular plate so as to surround the rotation axis; an anchor that is reciprocated along a linear trajectory that is perpendicular to the rotation axis of the circular plate; and a follower provided at the anchor and is moved along the cam, the cam being configured to include a first angle range and a second angle range such that the anchor is moved in opposite directions at different accelerations when the follower moves within the first angle range and when the follower moves within the second angle range, respectively, while the circular plate is rotated in one direction.

Abstract: Disclosed is a linear vibration motor comprising a movable element that is equipped with a magnet and weights; a coil for applying a driving force on the magnet through the application of an electric current; a frame, wherein the coil is secured; a shaft, borne on or secured by the frame, for supporting the movable element so as to be able to vibrate along the axial direction; and coil springs, disposed between the movable element and the frame, for elastically supporting the vibration of the movable element along the axial direction, on both sides of the movable element in the direction of vibration, wherein the directions of winding of the coil springs are set so as to prevent rotational vibration, around the shaft, of the movable element that is vibrating reciprocatingly along the axial direction.

Abstract: A vibration motor includes a housing; a stator; an vibrator accommodated in the housing; an elastic piece suspending the vibrator in the housing; a protrusion protruding along the center axis from the hole wall of the accommodation hole and formed at a position on the mass block corresponding to and fit with the bending structure; at least two magnets fixed on one side of the first side walls far from the hole wall of the accommodation hole. The vibrator includes a mass block with an accommodation hole, a center axis passing through a geometrical center thereof along a vibration direction of the vibrator; and a yoke disposed along a hole wall of the accommodation hole. The yoke includes a first side wall, a second side wall, and bending structures.

Abstract: A vibration motor is provided in the present disclosure. The vibration motor includes a shell providing an accommodating space, and a vibrating system elastically suspended and accommodated in the accommodating space. The vibrating system includes a magnet assembly and a coil assembly arranged opposite to each other. The coil assembly includes a coil unit with a lead wire, and a first circuit board connected to the lead wire. The vibrating system further includes a second circuit board fixed to the shell, and a twist line unit connected between the first circuit board and the second circuit board.

Abstract: A linear vibrating motor is provided in the present disclosure. The linear vibrating motor includes a housing, a vibrator, a stator and an elastic part. The vibrator and the stator are received in the housing, the elastic part suspends the vibrator. The stator includes a coil and a coil support supporting the coil. The coil support includes a supporting plate, a pair of supporting arms and a pair of supporting legs. The supporting plate supports the coil, the pair of supporting arms extends from ends of the supporting plate respectively, and the pair of supporting legs extends from ends of the supporting arms respectively and is opposite to the supporting plate. The vibrator comprises a groove to receive the supporting plate, and the vibrator is partially positioned between the pair of supporting arms.

Abstract: A horizontal linear vibration motor for securing the straightness of a coil spring and preventing a driving unit, such as a mass body, from axially rotating around the axis of a shaft within a housing due to the rotational property of the coil spring by providing a coil and a magnet for generating a force that enables the reciprocating motion of the driving unit including the mass body and an anti-rotation member provided in the driving unit to slide and come into contact with the housing.

Abstract: A haptic actuator may include a housing having opposing ends and opposing sides extending therebetween. The haptic actuator may also include at least one coil carried by the housing and a field member having opposing ends and opposing sides extending therebetween. The haptic actuator may also include a respective flexure coupling each end of the field member to an adjacent end of the housing so that the field member is reciprocally movable within the housing responsive to the at least one coil over an operating range and while maintaining a respective sidewall clearance between each side of the field member and an adjacent side of the housing. At least one sidewall clearance restricting feature may be configured to restrict the sidewall clearance when the field member moves beyond the operating range when subject to mechanical shock.

Abstract: An electromagnetic converter that converts kinetic energy to electric energy, or converts electric energy to kinetic energy, includes a core configured to have a coil disposed; a magnet configured to be magnetically coupled with the core; a yoke configured to have the magnet disposed; a fixing portion configured to have the core and the yoke placed; and an elastic member configured to support the yoke, and to elastically deform so as to displace the magnet with respect to the core. Both ends of the elastic member are fixed to the fixing portion. The magnet and the yoke can rotate around an axis in an extending direction of the elastic member.

Abstract: A voice coil motor (VCM) is disclosed, the VCM including: a stator including a magnet generating a first electromagnetic field; a mover including a bobbin formed with a hollow hole through which light passes and a coil formed on a periphery of the bobbin that generates a second electromagnetic field responsive to the first electromagnetic field; a base fixed at the stator and formed with an opening through which the light passes; and at least one elastic member elastically supporting the bobbin and forming a gap between the bobbin and the base when the coil is not applied with a current.

Abstract: According to one example, an ophthalmic surgical probe for treating an eye of a patient includes a body arranged for grasping by a surgeon and a cutting element extending distally from the body. The cutting element includes a sleeve member and an inner member disposed within the sleeve member, the inner member being movable axially with respect to the sleeve member. The probe also includes an actuating element configured to reciprocally move the inner member relative to the sleeve member. The actuating element includes a first coil secured within the body, a first magnet operatively secured to the inner member, and a second magnet that is not secured to the inner member, the second magnet being positioned and arranged to move in an opposite direction of the first magnet upon application of a voltage to the first coil.

Abstract: A vibration motor includes a base portion arranged to extend perpendicularly to a central axis extending in a vertical direction; a magnet portion fixed above the base portion, and arranged to point in the vertical direction; a vibrating portion including a coil portion arranged radially opposite to the magnet portion, and arranged around the magnet portion to vibrate in the vertical direction; a cover portion arranged to cover upper and lateral sides of the magnet portion and the vibrating portion, and fixed to the base portion; an elastic member arranged around the magnet portion between an inner surface of an upper portion of the cover portion and an upper portion of the vibrating portion, and arranged to extend radially inward in a downward direction from the inner surface of the upper portion of the cover portion; at least one adhesive layer fixed to an upper surface of the vibrating portion, and arranged in a circumferential direction below the elastic member; and at least one viscous body in a paste, a

Abstract: A power generation device of the present invention includes: a first magnet member; a second magnet member having its N-pole reversely disposed to an N-pole of the first magnet member; a center yoke capable of horizontally shifting and disposed between the first magnet member and the second magnet member; a coil disposed at the outer circumference of the center yoke; and a drive member horizontally shifting while holding the first magnet member and the second magnet member. The drive member and the center yoke horizontally shift in a first direction. After the horizontal shift of the center yoke in the first direction stops, the drive member further horizontally shifts in the first direction, and the center yoke horizontally shifts in a second direction opposite to the first direction.

Abstract: A vibration motor is disclosed. The vibration motor includes a housing having a receiving space; a vibration unit accommodated in the receiving space, the vibration unit including a main weight, a main pole plate, and a main magnet carried by the main pole plate, the main weight comprising a first weight, and a second weight opposed to and apart from the first weight; and a plurality of elastic members suspending the vibration unit in the receiving space. The main magnet is sandwiched between the first and second weights, and two ends of the main pole plate are respectively connected to the first weight and the second weight.

Abstract: The present invention relates to a haptic actuator, and the vibrating body includes a first magnet and a second magnet that are disposed on one end of the coil member in the vertical direction to be spaced apart from each other; a third magnet and a second magnet that are disposed on the other end of the coil member in the vertical direction to be spaced apart from each other; a first magnetic body that is mounted on one end of the first magnet and the third magnet in the horizontal direction; a second magnetic body that is mounted on the other end of the second magnet and the fourth magnet in the horizontal direction; and the first weight and the second weight that is mounted the first magnetic body and the second magnetic body respectively, the polarities of the first magnet and the second magnet having a north pole in the direction facing each other and a south pole in the opposite direction thereof, and the polarities of the third magnet and the forth magnet having a north pole in the direction facing eac

Abstract: A vibration generating device has a vibration generating member that causes vibration in a vibration direction, a vibration transmitting member, and a base body. The vibration generating member has a first yoke and a second yoke spaced in the vibration direction so as to face each other, a coil that generates magnetism, and a support body that supports the first yoke. A first gap is formed between the first vibration-side opposite surface of the first yoke and the second vibration-side opposite surface of the second yoke; these surfaces face each other in the vibration direction. A second gap is formed between the first orthogonal-side opposite surface of the first yoke and the second orthogonal-side opposite surface of the second yoke; these surfaces face each other in an orthogonal direction orthogonal to the vibration direction. The first gap is narrower than the second gap.

Abstract: The present disclosure is related to a vibration motor. The vibration motor includes a housing, a vibrator, a stator and an elastic part. One of the vibrator and the stator includes a coil, and the other includes a magnet opposite to the coil. The elastic part includes a first fixation part, a second fixation part and a connecting part. A weight includes a first side and a second side and a gap part formed by denting towards the direction far from a first side wall from the first side. The weight further includes a welding part protruding from the center of the gap part and extends to the edge of the gap part. The durability of the elastic part is accordingly increased, and the reliability of the product is thus improved.

Abstract: A linear vibrator includes a stator having a housing including a receiving space; a moveable unit received in the receiving space; an elastic member having one end connecting to the moveable unit and another end connecting to the stator for suspending the moveable unit in the receiving space; and a cushion arranged between the moveable unit and the housing, the cushion comprising a plurality of parts having different stiffness.

Abstract: According to embodiments of the disclosure, a downhole tool for taking acoustic measurements in a wellbore is provided. The tool may have an acoustic dipole transmitter with a piston made from a soft magnetic material, mounted on a centering spring between the first coil and the second coil, which moves the piston bi-directionally along a longitudinal axis when energized. The tool may also have a feedback winding on at least one of the first or second coils. The tool may also have a circuit for energizing the first and second coils which includes an input for receiving a signal responsive to the position of the piston relative to the coils and a processor for determining an output waveform used to generate an acoustic signal.

Abstract: A linear vibration motor is disclosed. The linear vibration motor, includes a housing provided with an accommodation space; a vibrator accommodated in the accommodation space; and an electromagnet accommodated in the accommodation space. The vibrator includes a weight having a through-hole and a plurality of permanent magnets engaging with an inner wall of the through-hole. A number of elastic connecting parts are accommodated in the accommodation space, one end of the elastic connecting part connected with the housing and the other end connected with the weight for suspending the vibrator in the accommodation space. The electromagnet includes an iron core and a coil around the iron core for producing magnet fields interacting with the permanent magnets further for producing attracting and repelling force to drive the vibrator to vibrate.

Abstract: A vibration motor includes a housing having a receiving space and a vibration unit. The vibration unit includes a main weight, a main pole plate, and a main magnet carried by the main pole plate. The main weight includes a first weight, and a second weight opposed to the first weight, the main magnet being sandwiched between the first and second weights, and two ends of the main pole plate respectively connected to the first weight and the second weight. The vibration unit further includes an auxiliary weight, an auxiliary pole plate, and an auxiliary magnet carried by the auxiliary pole plate. One of the main weight and the auxiliary weight forms a recess, and another forms a flange extending along a vibration direction corresponding to the recesses for engaging the main weight and the auxiliary weight.

Abstract: Provided is a linear compressor. The linear compressor includes a cylinder defining a compression space for a refrigerant, a piston reciprocated in an axis direction within the cylinder, and a linear motor providing power to the piston. The linear motor includes an inner stator disposed outside the cylinder, the inner stator including a center core and a side core disposed on at least one side of the center core, an outer stator disposed to be spaced outward from the inner stator in a radius direction, and a magnet movably disposed in an airgap defined between the inner stator and the outer stator. The side core includes a core body and a lead-out guide device coupled to the core body to expose or lead out a power line to the outside of the side core.

Abstract: A bistable electromagnetic actuator including: a tube; a stator arranged outside of the tube; and a rotor mounted in the tube so as to be displaceable along the longitudinal axis, the rotor at least partially comprises one or more of a paramagnetic and a ferromagnetic material and can be reversibly displaced between a first position and a second position by applying an electromagnetic field; wherein the stator comprises two ring permanent magnets, a coil for producing the electromagnetic field, and a back-iron element having two stator pole shoes; and the two ring permanent magnets comprise hard magnetic particles that are embedded in a plastic matrix.

Abstract: Provided is a linear actuator which is simple in structure, inexpensive to manufacture, in addition, has small magnetic leakage, and can provide a large inertial force without increasing the number of parts and weight.

Abstract: An actuator configured to provide haptic feedback to a user. The actuator is located on a plate and is configured to apply various excitations to the plate to generate a mechanical wave propagating in the controlled direction. The excitations can be a translational motion of the actuator (or a portion of the actuator) in two or three perpendicular axes. Alternatively, the excitations can be a non-translational motion (e.g., rotation about an axis) of the actuator (or a portion of the actuator). By generating the mechanical wave traveling in the controlled direction, loss of energy due to scattering of the mechanical wave can be obviated.