Abstract: It is possible to provide a vibrator configured so as to prevent the leakage of an adhesive out from between a frame and a diaphragm member and a portable information terminal having the vibrator. The vibrator includes: frame 11; diaphragm member 12 vibratably bonded to frame 11; and adhesive 21 used to bond the frame to the diaphragm member. To store adhesive 21, the vibrator further includes gap 22 which is formed between surfaces of frame 11 and diaphragm member 12 facing each other at bonded part 20 where frame 11 is bonded to diaphragm member 12 with adhesive 21, and the gap being used.

Abstract: A multifunctional voice coil motor is disclosed, the motor including a rotor including a bobbin and a plurality of magnets arranged at a periphery of the bobbin, a stator including a housing wrapping each magnet and a plurality of coil blocks each arranged at a position corresponding to that of each magnet, a base coupled to the housing, and an elastic member elastically supporting the rotor.

Abstract: A voice coil motor (VCM) includes a moving unit, a fixing unit, an elastic plate, and a conducting pole. The moving unit includes a moving barrel and a coil assembly around the moving barrel. The coil assembly includes a connecting portion. The moving barrel defines a blind hole on an upper surface thereof, one end of a conducting pole being received in the blind hole. The fixing unit defines a through hole receiving the moving unit. The elastic plate is connected between the moving barrel and the fixing unit. The conducting pole provides a stable electrical connection between the elastic plate and the connecting portion notwithstanding movements of the moving barrel.

Abstract: An electrodynamic actuator, in particular for a microvalve or a micropump, includes a magnet arrangement for generating a magnetic field and a control element movable relative to the magnet arrangement. The control element includes an energizable air-core coil (22) which is arranged in the magnetic field and firmly coupled to a coil carrier (20) made from a nonmagnetic material.

Abstract: Disclosed is a voice coil motor, the motor including a rotor having a cylindrical bobbin that has a support block protruding from an upper end of an outer circumference thereof and a coil block that is coupled to the outer circumference of the bobbin in a direction from a lower surface to an upper surface of the bobbin and is supported by the support block, a stator having a magnet facing the coil block and a yoke holding the magnet, elastic members coupled to upper and lower surfaces of the bobbin, respectively, a base supporting the stator and the elastic members, and a foreign substance inflow-prevention portion formed on an upper surface of the base in such a way as to protrude around an opening formed in a central portion of the base in a shape of a closed loop.

Abstract: The application describes an electromechanical actuator for generating a mechanical force to be transferred to an apparatus. The electromechanical actuator comprises an electromagnetic coil, a connecting member, and a magnet. The connecting member is mechanically coupled between the electromagnetic coil and the apparatus and is configured to transfer the mechanical force from the electromagnetic coil to the apparatus. The magnet is disposed between the electromagnetic coil and the apparatus and includes a channel in which the electromagnetic coil is disposed, the channel having a channel opening that faces away from the apparatus, the magnet further having a central hole through which the connecting member extends.

Abstract: An electromagnetic vibrator includes an electromagnetic provider and a vibration unit, wherein the vibration unit includes a diaphragm unit and an induction coil unit affixing on an inner side of the diaphragm unit, so that when the vibration unit is mounted to the electromagnetic provider, the induction coil is inducted to the electromagnetic to generate an electromagnetic field, so as to axially vibrate the induction coil to vibrate the vibration unit.

Abstract: A VCM is disclosed, the motor including a stator including a first driving unit, a rotor arranged inside the stator, including a second driving unit responding to the first driving unit and mounted therein with a lens, a base fixing the stator, and an elastic member coupled to the rotor to float the rotor from the base in a case a driving signal for driving the first and second driving units is not applied to the first and second driving units.

Abstract: An actuator may include a drive coil, a drive magnet part, a coil holding body and a magnet holding body. The coil holding body may include a tube part around which the drive coil is wound, and the drive magnet part may include two drive magnet pieces whose opposed faces are magnetized in the same magnetic pole. The coil holding body may be linearly and relatively movable to the magnet holding body. The magnet holding body may include an opening part formed in one of the two end face parts structuring the magnet holding body. The coil holding body may include a protruded part which is protruded to an outer side through the opening part, the protruded part may formed so as to extend over the tube part, and a flat part in a flat face shape may be formed in the protruded part.

Abstract: Disclosed is a voice coil motor, the motor including a rotor having a cylindrical bobbin that has a support block protruding from an upper end of an outer circumference thereof and a coil block that is coupled to the outer circumference of the bobbin in a direction from a lower surface to an upper surface of the bobbin and is supported by the support block, a stator having a magnet facing the coil block and a yoke holding the magnet, elastic members coupled to upper and lower surfaces of the bobbin, respectively, a base supporting the stator and the elastic members, and a foreign substance inflow-prevention portion formed on an upper surface of the base in such a way as to protrude around an opening formed in a central portion of the base in a shape of a closed loop.

Abstract: A voice coil motor (VCM) includes a fixed assembly and a movable assembly. The fixed assembly includes a fixed bracket and a coil group. The fixed bracket is substantially tri-columnar in shape and includes three sidewalls supporting the coil group thereon, and defines a first receiving cavity between the three sidewalls. The coil group is arranged on the three sidewalls. The movable assembly includes a movable barrel movably received in the first receiving cavity, and a magnet group. The movable barrel is also substantially tri-columnar in shape and includes three external surfaces. The magnet group is arranged on the three external surfaces of the movable barrel and spatially opposite to the coil group.

Abstract: A voice coil motor (VCM) includes a fastening portion, a moving portion, a magnet assembly, a coil, an elastic sheet, and glue. The lower plate seals the fastening portion. The lower plate includes a first surface and a second surface opposite to the first surface, the lower plate defines a through hole penetrating the first surface and the second surface, the low plate defines a first glue recess around the through hole and a second glue recess along an edge of the low plate in the first surface. The fastening portion is positioned on the first surface of the lower plate via glue received in the first glue recess.

Abstract: A voice coil motor (VCM) includes a fixing portion, a moving portion, a magnet assembly, a coil, and an elastic sheet. The fixing portion includes an upper plate and a sidewall extending from edges of the upper plate. The moving portion is received in the fixing portion, and includes a top surface and an outer surface connected to the top surface. The moving portion defines a plurality of glue receiving recesses in the top surface and a plurality of second connecting portions each extending from a bottom surface of each glue receiving recess. The magnet assembly is fixed on the inner surface. The coil is circled around the outer surface of the moving portion, and is opposite to the magnet assembly. The elastic sheet is connected between the first connecting portions and the second connecting portions.

Abstract: A voice coil motor includes a stationary member, a moveable member, an upper resilient plate, and a lower resilient plate. The stationary member includes a receiving room and a magnetic unit. The magnetic unit consists of two magnets adhering to two sidewalls of the stationary member. The moveable member is received in the first receiving room and spaced from the stationary member. The moveable member includes a frame and coils wrapped around the frame. The coils face the magnets. The magnets and the coils cooperatively drive the moveable member to move upward from an initial position. The upper resilient plate and the lower resilient plate connect the stationary member with the moveable member. The two resilient plates provide a restoring force to drive the moveable member to return to the initial position.

Abstract: A VCM (voice coil motor) is disclosed, the VCM including: a rotor including a lens-accommodating, both ends opened cylindrical bobbin and a coil block including a coil wound on a periphery of the bobbin; a stator including a cylindrical yoke formed with a lens-exposing opening, a plurality of magnets disposed inside the yoke and opposite to the coil block, and a magnet fixing member disposed inside the yoke to fix the plurality of magnets; and an elastic member elastically supporting the bobbin.

Abstract: A VCM is disclosed, the VCM including a base formed with an opening; a bobbin arranged on an upper surface of the base and mounted with a lens therein; a plurality of magnets secured on the base to face a periphery of the bobbin; a coil block encompassing each magnet and the bobbin, and secured to a part of the bobbin exposed between the magnets; and a cover can encompassing the magnets and the coil block.

Abstract: The present invention provides a voice coil motor comprising a carrier, upper and lower spring plates, magnets, a base and a conductor. The carrier comprises a main body and a coil surrounding said main body. The upper spring plate is provided on the top of the main body and the lower spring plate is provided on the bottom of the main body. The lower spring plate comprises a lower securing portion and a lower actuating portion; the lower actuating portion is adjacent to the bottom of the base. The magnets are arranged outside of the coil; the conductor between the lower spring plate and the base comprises an attachment plate and two conductive legs. The attachment plate is attached to the lower securing portion and the two conductive legs are integrally formed with the attachment plate such that assembly of the voice coil motor is greatly facilitated.

Abstract: A voice coil motor for driving a lens group includes a housing, a first cover, a second cover, a movable member, and a plurality of magnets. The housing is a hollow and includes a top plate and four sidewalls protruding from the top plate. The movable member is movably received in a space defined by the housing and the first and second covers, and includes a barrel for receiving and being connected to the lens group, and a coil arranged around the barrel. The magnets are arranged between the housing and the movable member, stayed in contact with the sidewalls, and drive the movable member and the lens group to move in the housing when a current is supplied to the coil.

Abstract: A voice coil motor assembly includes a coil support, a coil wound on the coil support, and two opposing lower elastic plates disposed on an upper part of the coil support. The outer edge of an upper flange of the coil support has at least two opposing protrusions which are arranged radially. The coil has a head end and a tail end which are respectively wound on the two protrusions. The two lower elastic plates are respectively connected with the coil wound on the two protrusions by welding. To prevent the head end from slanting, the lower elastic plates are mounted on the coil support through the operation of an automation apparatus to be soldered with the coil wound on the protrusions. The connection of the coil and the lower elastic plates is firm, without the problem of disconnection, to ensure the quality of the product of the voice coil motor assembly.

Abstract: A voice coil motor (VCM) is disclosed, the VCM including: a rotor including a bobbin accommodated by a lens, and a coil block arranged at a periphery of the bobbin, a base formed with an opening for exposing a lens and a first foreign object penetration prevention unit formed along an upper edge, a stator including magnets wrapping the coil block and a housing formed with an opening for fixing the magnets and formed at a bottom surface with lateral surfaces formed with a second foreign object penetration prevention unit coupled to the first foreign object prevention unit, and an elastic member coupled to the bobbin to elastically support the bobbin.

Abstract: A VCM (voice coil motor) is disclosed, the VCM including: a rotor including a lens-accommodating, both ends opened cylindrical bobbin and a coil block including a coil wound on a periphery of the bobbin; a stator including a cylindrical yoke formed with a lens-exposing opening, a plurality of magnets disposed inside the yoke and opposite to the coil block, and a magnet fixing member disposed inside the yoke to fix the plurality of magnets; and an elastic member elastically supporting the bobbin.

Abstract: A synthetic jet actuator is provided which includes a voice coil, a yoke consisting of a back iron (303) and pole piece, a plate (307), a first magnet (305) disposed on a first side of said plate, and a second magnet (309) disposed on a second side of said plate. The second magnet is disposed on said pole piece, and the first and second magnets and the plate cooperate to produce and direct magnetic flux which drives the voice coil.

Abstract: A VCM (voice coil motor) is disclosed, the VCM including: a rotor including a cylindrical bobbin for accommodating a lens and protruded at a bottom end with a boss, and a coil block arranged at a periphery of the bobbin; a stator including a magnet facing the coil block and a yoke fixing the magnet; and an elastic member including a first elastic member formed with a through hole coupled to the boss of the bobbin and a second elastic member coupled to an upper end facing the bottom end of the bobbin; wherein the boss is formed with a disengagement prevention unit preventing the first elastic member from being disengaged from the boss, and the first elastic member is formed with a coupling unit contacting a joint where the disengagement prevention unit and the coupling unit meet.

Abstract: This invention provides an actuator, comprising: a supporting frame having a movable element accommodation space; a movable element received by the movable element accommodation space of the supporting frame, at least one elastic element accommodation space and at least one electrically-driven element accommodation space being arranged in proximity to each other around the exterior thereof; an electrically-driven element received by the at least one electrically-driven element accommodation space and configured to cause the movable element to move with respect to at least one axis; and an elastic element configured to provide an elastic force with respect to at least one axis, wherein the elastic element is received by the at least one elastic element accommodation space and able to perform a sliding function with the at least one elastic element accommodation space.

Abstract: Disclosed herein is a linear vibration motor. The motor includes a stator and a vibrator. The stator includes a magnet. The vibrator includes a coil facing the magnet. A weight is coupled to the coil. A PCB is connected to the coil and the stator. An elastic member is coupled to stator and the coil. A damper is provided on the weight at a position facing the elastic member. The damper may be provided between the elastic member and the weight or between the elastic member and the inner surface of a casing. The damper can mitigate metallic high frequency noise attributable to friction between the elastic member and the weight or between the elastic member and the casing. Furthermore, the spatial utilization is increased, thereby enhancing the degree of freedom in designing the linear vibration motor.

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: A method is provided for making a synthetic jet ejector.

Abstract: An exemplary voice coil motor includes a base, a stationary magnetic field generator, a moveable magnetic field generator, and a case. The base includes a first surface defining a number of cavities. The stationary magnetic field generator is mounted on the first surface, and includes a supporting frame defining a first receiving space. The moveable magnetic field generator is moveably received in the first receiving space, and includes a core member. The core includes a lower surface. A number of flanges extend downwards from the lower surface, and received in a respective one of the cavities. Each of the flanges includes an end surface that is away from the lower surface. The end surface defines two symmetrical sloped surfaces respectively extending slantingly downward from the middle of the end surface to two opposite sides of the flange. The case receives the stationary magnetic field generator, the moveable magnetic field generator.

Abstract: Disclosed herein is a linear vibration motor including: a stator part having an internal space formed therein and including a main magnet mounted therein; a vibrator part including a coil disposed to face the main magnet and accommodated in the internal space of the stator part; and an elastic member connecting to the stator part and the vibrator part to each other, wherein the vibrator part further includes an auxiliary magnet disposed to face the main magnet.

Abstract: A linear motor includes an assembly of two magnets separated by a non-magnetic spacer wherein the assembly is coaxially affixed inside of a housing, which results in an air gap therebetween. The magnets are positioned to have a same direction of magnetization. A first embodiment of the motor includes a coil carrier having a single electrical coil of two sections wound in the same direction and positioned into the corresponding two winding areas of the carrier. The coil carrier is movably positioned into the air gap and further to surround the assembly, thereby moving along an axial direction of the motor. A second embodiment includes two coils that wound in a same direction with the respective separated wires and positioned into the respective two winding areas of the coil carrier.

Abstract: Disclosed herein is a linear vibration motor including: a stator part including a magnetic force part and a casing receiving the magnetic force part therein; and a vibrator part including a coil facing the magnetic force part to thereby generate electromagnetic force and a printed circuit board having one end coupled to the stator part and the other end coupled to the coil, wherein the vibrator part moves linearly along a longitudinal outer peripheral surface of the casing receiving the magnetic force part therein.

Abstract: Disclosed is a linear vibrator including a fixing part providing an inner space of a predetermined size, at least one magnet disposed in the inner space of the fixing part to generate a magnetic force, a vibration part including a coil disposed to face the magnet to generate electromagnetic force by interacting with the magnet and a vibrating mass body, an elastic member coupled to the fixing part and the vibration part to provide an elastic force, and a substrate coupled to the vibration part and including a through hole through which the magnet passes to prevent the substrate from contacting the magnet when the vibration part is vibrated.

Abstract: A magnetic circuit for a voice coil, comprising, a magnet cup with a one sided open cylindrical shape with a base. The magnetic circuit further includes a conical magnet with a side including a partial conical shape. The magnetic circuit includes a pole shoe which has a side with a recessed conical shape corresponding to the conical shape of said magnet. The magnet cup, the conical magnet and the pole shoe are stacked so that the conical magnet is centrally arranged on the base inside said magnet cup, the pole shoe is arranged on the conical magnet so that the side with a recessed conical shape of the pole shoe is in contact with the side with a conical shape of the conical magnet, such that an air gap is obtained between an inner wall surface of the magnet cup and the stacked conical magnet and the pole shoe.

Abstract: A magnetic levitation motor includes a fastening unit and a moving unit. The fastening unit includes a fixing frame and a first magnet assembly. The fixing frame includes a lower plate and four guiding poles extending upward from corners of the lower plate. The first magnet assembly includes four first magnets supported on the lower plate. Each first magnet is positioned between two adjacent guiding poles. The moving unit includes a moving frame and a second magnet assembly. The moving frame includes an outer surface and defines a receiving recess on the outer surface. The second magnet assembly includes four second magnets received in the receiving recess. The first magnets are positioned above the second magnets along an optical axis of the magnetic levitation motor.

Abstract: A VCM (voice coil motor) is disclosed, the VCM comprising: a bobbin formed with a support unit protruded from a periphery of a body at a bottom portion of the body, and a recess unit partially removed at the support unit; and a coil block supported by the support unit and including a plurality of coil layers wound at a periphery of the bobbin, wherein first and second distal ends of the coil block pass through the recess unit.

Abstract: The present invention provides a voice coil motor comprising a carrier, upper and lower spring plates, magnets, a base and a conductor. The carrier comprises a main body and a coil surrounding said main body. The upper spring plate is provided on the top of the main body and the lower spring plate is provided on the bottom of the main body. The lower spring plate comprises a lower securing portion and a lower actuating portion; the lower actuating portion is adjacent to the bottom of the base. The magnets are arranged outside of the coil; the conductor between the lower spring plate and the base comprises an attachment plate and two conductive legs. The attachment plate is attached to the lower securing portion and the two conductive legs are integrally formed with the attachment plate such that assembly of the voice coil motor is greatly facilitated.

Abstract: Disclosed is a linear vibrator, the linear vibrator including: a stator including a circuit substrate formed at a bottom surface with a connection terminal and a coil block arranged at an upper surface opposite to the bottom surface and electrically connected to the connection terminal; a first cover arranged at the bottom surface of the circuit substrate and formed with an opening for exposing the connection terminal; a second cover coupled to the first cover in a bottom-opened cylindrical shape; and a vibrator including a magnet arranged inside the coil block, a yoke in which the magnet is mounted, and an elastic member coupled to the yoke and the second cover to vertically vibrate the magnet relative to the coil block.

Abstract: A vibration generator includes a tubular magnetic case, an end cover holding a first bearing metal, a second bearing metal held in a burring portion of the bottom plate of the case, a non-magnetic movable thrust shaft that is inserted in an axially movable manner spinning the first and second bearing metal, and first to third toroidal coils connected and fixed at the inner circumference of the case. The vibration generator further includes a first annular pole piece fixed to the movable thrust shaft, a first and a second tubular permanent magnet of axial magnetization, a second annular pole piece and third annular pole piece, first and second wight body fixed at both ends of the movable thrust shaft outside the case, a first coil spring between the end cover and the first wight body, and a second coil spring between the bottom plate and the second wight body.

Abstract: A portable electronic device comprises an electromechanical module having an actuator for positioning a mechanical element between first and second positions, and a controller coupled to the electromechanical module. The controller is configured to detect a mechanical event coupling to the electromechanical module, select an actuation signal to position the mechanical element in a safe position between the first and second positions, and transmit the selected signal, such that the mechanical element is positioned in the safe position during the event.

Abstract: A linear actuator, comprising: a base; a fixed part support mechanism attached to the base; a fixed part elastically supported by the fixed part support mechanism; and a movable part driven to reciprocate in a predetermined drive direction with respect to the fixed part, wherein the fixed part support mechanism comprises: a movable block attached to the fixed part; a linear guide that couples the movable block with the base to be slidable in the predetermined drive direction; and an elastic member that is disposed between the base and the movable block and prevents transmission of a high frequency component of vibration in the predetermined drive direction.

Abstract: A loudspeaker magnetic motor utilizes a voice coil with two or more wire coils that are connected in parallel and that are layered on top of one another. The motor utilizes, as a magnetic field source, a permanent magnet and, more particularly, a permanent magnet that includes a rare earth metal such as a neodymium boron iron magnet.

Abstract: A magnetic motor system for driving a loudspeaker voice coil. The system has first and second parts that define a volume for receiving a voice coil. The first and second parts each have a respective permanent magnet with first and second sidewalls that extend in a direction away from the volume. The first sidewall slopes in a direction towards the second sidewall as the sidewalls extend away from the volume. The first and second parts further have respective guide members for channelling lines of magnetic flux in a return path between the permanent magnets.

Abstract: A lens driving device, which movably supports a lens assembly along a direction of an optical axis of a lens, includes an actuator base disposed to a lower side of the direction of the optical axis, a lens holder made of a ferromagnet that is disposed to an upper side of the actuator base and which has a tubular portion for holding the lens assembly, a ring-shaped driving coil fixed to the lens holder so as to be positioned around the tubular portion, a yoke covering the lens holder so as to be apart from the driving coil and to oppose to the lens holder in a state where the driving coil is sandwiched therebetween, and a guide arrangement guiding the lens holder along the direction of the optical axis.

Abstract: A VCM (voice coil motor) is disclosed, the VCM including: a rotor including a lens-fixing hollow holed bobbin including a coil discharge unit formed from a peripheral upper end to a peripheral bottom end facing the peripheral upper end, and a coil block arranged at a periphery of the bobbin and including a cylindrically wound coil; a stator including a magnet facing the coil block and a yoke fixing the magnet; a case including a bottom case arrange with the bobbin and an upper case coupled to the bottom case and having an opening at a portion corresponding the bobbin; and an elastic member elastically supporting an upper end of the bobbin and a bottom end facing the upper end of the bobbin, wherein a distal end of the coil arranged at an upper end of the coil block employs the coil discharge unit to be discharged to a bottom end of the bobbin.

Abstract: Disclosed is a voice coil motor, the motor including a mover having a bobbin equipped with a lens and a coil block secured to an outer circumference of the bobbin; a stator having a magnet that is disposed in such a way as to face the coil block; elastic members coupled to a lower end of the bobbin and connected to both ends of the coil block; a base supporting the elastic members and the stator; and a cover can covering the mover, the stator and the base, with an opening being formed in the cover can to expose the lens therethrough, wherein each of the elastic members includes a terminal portion that extends between the cover can and a side surface of the base, the terminal portion including a short-circuit prevention portion so as to inhibit a short-circuit between the terminal portion and the cover can.

Abstract: The invention is an electrodynamic linear oscillating motor, which has high power densities in the magnet gap, a high efficiency, and magnetically restores the oscillating system to a center position. The linear oscillating motor has a stator system, which has at least one magnet, and an oscillating system, which is movably mounted in the magnetic field of the stator. The oscillating system has at least one core made of a soft magnetic material, and at least one driving coil. The electrodynamic linear motor combines the advantages of the known moving coil and moving magnet linear motor, achieving electrodynamic conversion levels of up to 99%. The motor is suited as a drive for refrigerating and air conditioning systems having low power and also for pumping and injection systems, and, reversing the electrodynamic principle, as a generator, such as for shock absorber systems in a motor vehicle.

Abstract: The disclosed is a linear motor which comprises an armature part including a coil, a field magnet part including a permanent magnet or an electromagnet, and a yoke part, in which the armature part is distributed in the field magnet part to excite the coil in the armature part, and which gives either the armature part or the field magnet part a rectilinear motion, wherein the armature part has a molded body in which the coil is covered with a magnetic substance, or has a structure in which a wall is formed on at least one of the internal circumference and the outer circumference of the coil with a magnetic cylindrical body.

Abstract: An optical device may include a movable body holding a lens, a fixed body movably holding the movable body, a drive magnet and a drive coil for relatively moving the movable body with respect to the fixed body, and a metal member fixed to the drive magnet. The drive magnet is fixed to one of the movable body and the fixed body and the drive coil is fixed to the other of the movable body and the fixed body. A nickel plating layer containing at least nickel is formed on a surface of the drive magnet and a surface of the metal member, and the drive magnet and the metal member are joined to each other by a joining layer which is made of tin-based metal containing at least tin and is disposed between the drive magnet and the metal member.

Abstract: Disclosed is a vibration motor for a portable terminal, including a flat spring; a cylindrical magnetic substance mounted on the flat spring; an annular magnetic substance disposed around the cylindrical magnetic substance mounted on the flat spring; and a coil disposed between the cylindrical magnetic substance and the annular magnetic substance, wherein the magnetic substances perform a linear reciprocal movement by the electromagnetic force generated between the magnetic substances and the coil and by the elastic force of the flat spring as an electric current is applied to the coil. The vibration motor operates at higher resonant frequencies than those of conventional vibration motors, thereby improving the sense of an after-vibration and realizing a delicate haptic feedback function.

Abstract: A voice coil motor includes a mount, a movable unit and a number of rollers. The mount includes a through hole, a number of recesses opposing the through hole, and a number of magnetic blocks mounted in the through hole. The movable unit includes a barrel and a coil of wire surrounding the barrel. The movable unit is movably received in the through hole of the frame and surrounded by the magnetic blocks. The rollers are rotatably received in the respective recesses and come in contact with the barrel. The rollers hold the movable unit in position when no magnetic force needed to be applied on the movable unit.