Abstract: A vibration motor having mounting hardware with a width dimension able to be kept within a thickness of a motor case, that is, a vibration motor provided with a vibration motor body attaching an eccentric weight to a motor shaft sticking out from a bearing part of a motor case and attaching a pair of motor terminals to a plastic end cap closing an opening of the motor case and with mounting hardware carrying this vibration motor body and to be set on a board, wherein the mounting hardware has a raised bottom flat-shaped part facing a barrel circumference of the motor case, oriented in an axial direction, and to be bonded to mounting patterns on the board, a collar-shaped support piece extending from this raised bottom flat-shaped part and fit over the bearing part in the axial direction, and a plug-in support piece extending from the raised bottom flat-shaped part to the opening side and plugged into first and second positioning slots provided in the plastic end cap in the axial direction.

Abstract: A device for generating forces that are variable and controllable in amplitude, in direction, and in frequency, the device includes two unbalanced rotors (18, 20, 35 to 38) mounted coaxially in a casing (11). The device further includes electromagnetic drive elements for driving a first of the two rotors in rotation relative to the second of the two rotors, and brake elements (43 to 45) for braking the second rotor (20, 36, 38) relative to the casing.

Abstract: A reciprocal vibration generator occupying a small area on a board and able to be mounted by solder reflow, the reciprocal vibration generator provided with a cylindrical case body in which a weight is suspended and supporting a flat spring, a permanent magnet attached to the bottom side of the weight, and a bottom lid carrying an air core toroidal core for making the weight vibrate in the up-down direction by magnetic attraction or magnetic repulsion of this permanent magnet and closing a bottom opening of the case body. The bottom lid is an insert molded board comprised of three terminal boards insulated and separated by a molding plastic. Outside surfaces at the recesses of the terminal boards projecting down from the bottom surface of the molding plastic form board connection patterns for solder reflow.

Abstract: An axial air-gap rotor includes wound air-core armature coils disposed on one side of a printed wiring board, and a cylindrical commutator disposed at the rotation center. The commutator includes commutator pieces separated from each other by positioning guides provided on the base, and each having a connection terminal integral with and extending axially from an arc-shaped sliding contact portion and flat portion, the printed wiring board further having terminal connection lands for the wound air-core armature coils, and through holes connected to the terminal connection lands in which the distal ends of the connection terminals are fitted and connected on the other side.

Abstract: A vibration generator has rotatable imbalance masses disposed on at least two shafts, in which means for adjusting the rotational position of the imbalance masses relative to one another are disposed. There is at least one sensor for determining the angular acceleration of the rotating imbalance masses. The sensors may also determine acceleration of the vibration generator. There is a module for determining the angular acceleration of the rotating imbalance masses on the basis of the measurement values determined by the sensors. A vibration pile driver for introducing elements to be pile-driven into the ground, and drawing them from the ground, as well as for compacting ground material, contains one of the aforementioned vibration generators.

Abstract: A vibrator includes a voice coil and a vibrating member supported by first and second suspensions so as to be vibratory in the axial direction of the coil. Each of the first and second suspensions has an inner ring portion fixed to the vibrating member and an outer ring portion fixed to a casing of the vibrator. The inner and outer ring portions are connected through arcuate portions. Each arcuate portion has a first end connected to the inner ring portion and a second end connected to the outer ring portion. The arcuate portions of the first and second suspensions extend from the first end to the second end, respectively, in the same circumferential direction as seen from one side of the axial direction.

Abstract: A vibrator assembly includes an electric motor, a shaft driven by the motor, and a cylindrical weight coaxially positioned on the shaft free end, wherein the cylindrical weight has a center of gravity that is radially offset from the shaft axis. The cylindrical weight includes a first portion that is lighter in weight than a second portion. When the vibrator assembly is installed within an electronic device, the cylindrical shape of the weight limits the amount of shaft deflection that can occur when the electronic device is dropped or subjected to other impact forces.

Abstract: To realize high reliability and a long-term stabilized power supply (long lifetime) in the connection between a power supply terminal and a power supply land on a circuit board.

Abstract: A rotor, vibration motor having the same, and fabrication method thereof are disclosed. A rotor according to an embodiment of the invention comprises a first layer on which are formed a plurality of commutators, a second to an n-th layer—wherein n is 4 or greater—on which are formed a plurality of patterned coils that are connected with the commutators, insulation layers interposed in-between the first to the n-th layers; blind via holes which connect the commutators of the first layer with the patterned coils formed on the second layer and which connect the patterned coils formed on the (n?1)-th layer with the patterned coils formed on the n-th layer, and a plurality of through holes which connect the patterned coils formed on the second to the (n?1)-th layers, where the patterned coils located on the second to the (n?1)-th layers are connected by means of different through holes.

Abstract: In order to improve the reliability of an electrical connection between a power supply terminal of a vibrator and an electrode of a circuit board and to improve the efficiency of mounting the vibrator on the circuit board, the power supply terminal is made from a torsion coil spring and a contact portion of the power supply terminal in contact with the electrode of the circuit board is formed by winding. In addition, a torsion coil spring portion is wound around a spindle pin and a housing is provided with a step portion as a space for accommodating the contact portion without interference and a plane portion to which the contact portion faces.

Abstract: A vibrating massager includes a housing (10), a power source (14) supported by the housing and a replaceable motor (12). The housing (10) and motor (12) are configured so that the motor may be readily replaced by a human operator without the need to replace the housing, power source, or other components. The motor (12) may be sized and configured to substitute for a conventional battery in a multi-battery device. When positioned in place of a battery in a supporting device, the motor operates to impart a vibrating motion to the supporting device.

Abstract: A vibration motor having a vibration motor main body 10 provided with a motor shaft 12 projected from a motor case 11, an eccentric weight 20 being attached to the motor shaft; a metal holder frame 30 having a tubular shape and being provided with a flat bottom part 31 and a wall surface 32, the flat bottom part 31 having an inner projection 31f with a bottom-up recess part W, the wall surface 32 having a domal structure rising up from both-side edges 31a and 31b of the flat bottom part 31; and a pair of external terminal pieces 14 and 15 attached to a plastic end cap 13 for closing an opening of the motor case 11 at the side opposite to the eccentric weight; wherein the plastic end cap 13 integrally has a pair of spacer projections 13b and 13c inserted between the motor case 11 and the inner sides of the both-side edges 31a and 31b of the flat bottom part 31, whereby, even when a motor case having a round circumferential surface is used, the motor case 11 is not easily unfastened from a metal holder frame 30

Abstract: In a vibration motor holding structure for retaining a vibration motor having eccentric weights at rotation shaft ends and holding the vibration motor on a circuit board, there is provided a metal holder having support legs provided along a part of the length of the vibration motor and protruding horizontally in the direction orthogonal to the longitudinal direction of the vibration motor on both sides thereof. Thus, the vibration motor can be prevented from falling over during the mounting process and be held on the circuit board at solder-applied positions.

Abstract: A board mounted structure of a vibration motor which self aligns along with melting of cream solder even if deviation occurs in positioning of the flat bottom surface of a metal holder frame and a fastening pattern at the time of automatic mounting, that is, a board mounted structure having a vibration motor having a metal holder frame into which a motor case is fit and a pair of external terminal pieces attached to a plastic end cap and a printed circuit board having a fastening pattern shaped left-right symmetric about a center line and superposed with a bottom surface of the metal holder frame and power feed patterns adjoining this fastening pattern, arranged left-right symmetrical with respect to a center line, and superposed with corresponding external terminal pieces, the metal holder frame having front projecting pieces and a back projecting piece at its flat bottom surface, the fastening pattern having front extending pattern surfaces superposed with corresponding front projecting pieces and a back ex

Abstract: A massaging vibrator includes a massage assembly provided with a contact member, which is at least partly elastically deformable, and which can be applied directly or indirectly to the skin of a user, and which can be used in a deformed position when a stress is applied by the user. The arrangement also includes a reinforcement for the contact member at least partly embedded inside the contact member, with the reinforcement being able to deform jointly with the contact member and capable of keeping the contact member in the deformed position when the user ceases to apply the stress. The vibrator further includes at least one vibration generator, preferably directly in contact with the reinforcement within the contact member.

Abstract: A direct current (DC) brushless vibration motor includes an inductive coil as the stator, and a magnetic element, which has a plurality of coplanar magnetic poles, as the rotor. The inductive coil is a single annular coil formed by a singly-wound conductive wire. The winding area corresponds to two magnetic poles of the magnetic element of the like polarity at opposite sides. The magnetic element has a centrifugal slot to make the gravity center of the magnetic element eccentric from the axis. When current is input into the inductive coil to form a magnetic field, the magnetic element and the magnetic field generated by the inductive coil repulse each other to generate rotation. The eccentric gravity center of the magnetic element can generate the vibration desired.

Abstract: In a solder reflow process, a vibration motor is stably mounted on a circuit board by changing the design of a partial shape of a soldered motor holder without changing the design of a vibration motor body and securing a sufficient soldering area to completely perform solder bonding to prevent a soldered portion of a motor holder from peeling off the circuit board. [Solution] To provide a surface mount type vibration motor, wherein the pedestals of a motor holder comprise the support plates that are in contact with stationary lands on a surface of a circuit board and extend in the axial direction of an output shaft, end portions of the support plates are arranged between the position of an eccentric weight and the end surface of the eccentric weight along the axial direction, and the support plates are not arranged just under an axis of said output shaft where the distance between the weight and the circuit board is minimum.

Abstract: A vibration motor includes: a rotor having an eccentric gravity center; a shaft inserted through a bearing of the rotor; a magnet provided at a position facing the rotor, at least one commutator circumferentially formed on a lower surface of the rotor; at least one pair of brushes being in contact with the commutator; a first terminal and a second terminal connected with the one pair of brushes and exposed to the external at their lower sides so as to be in contact with an electric line; and a base as a mold for fixing the first terminal and/or the second terminal thereto.

Abstract: The present invention provides a vibration-generating stepping motor including: two stator yokes; a bearing that magnetically couples the two stator yokes; a rotor frame that rotates on a circumference of the stator yokes; and an eccentric weight that shifts a gravity center of the rotor frame from a rotation center of the rotor frame.

Abstract: There is provided a holding structure to hold a vibration motor on a circuit board with a sufficient holding strength using an inexpensive and simple means such as caulking and bonding and a vibration motor held on a circuit board using the holding structure. The holding structure having a holder clamps a vibration motor body having an eccentric weight at an end of the rotation shaft around the outer periphery from the outside and supports the vibration motor at the lower part.

Abstract: Controlling haptic sensations from a vibrotactile feedback device connected to a computer. The vibrotactile device includes an actuator having a rotatable mass, and receives information, which causes a periodic control signal to be produced. The control signal controls the actuator to rotate the mass to induce a vibration in the device, where a magnitude and a frequency of the vibration can be adjusted independently of each other by adjusting the control signal. Vibration magnitude is based on control signal duty cycle, and vibration frequency is based on control signal frequency. Kinesthetic haptic effects can be output on the vibrotactile device by mapping the kinesthetic effect to a vibrotactile effect that causes vibrotactile forces to be output. The kinesthetic haptic effect can be a periodic or nonperiodic effect.

Abstract: A vibration motor and an electronic device utilizing the same. The vibration motor is disposed in a housing to abut the housing. A first case is disposed in the housing. A second case is combined with the first case. A magnet and a rotor are disposed between the first and second cases. A shaft passes through the magnet, the rotor, and the second case, and is rotatably disposed on the first case. A weight is exposed by the second case, and connected to the shaft passing through the second case. The weight rotates along with the shaft to generate vibration. The vibration of the weight is transmitted to the housing.

Abstract: A slim type vibration motor is provided. The slim type vibration motor includes a case, a shaft, a rotor, a printed circuit board, and a plurality of coils. The shaft has at least one end thereof fixed to a central portion of the case. The rotor rotates about the shaft within the case, and includes a rotor yoke, a magnet fixed to the rotor yoke, and a weight imparting eccentricity to the rotor. The printed circuit board is installed to a bottom surface of the case, and forms a coil hole in a region thereof facing the magnet. The plurality of coils passes through the coil hole and is installed on the bottom surface of the case.

Abstract: Provided is a spindle motor comprising a stator and a shaft provided in the stator. A rotor is coupled with the shaft, and a turntable is connected with the shaft. The turntable has a ball container for receiving a plurality of ball, and the ball container has an inclined inner or outer wall. A ball cover is coupled with the ball container and having decelerating means. Herein, the decelerating means comprise an inclination or protrusions formed in the ball cover.

Abstract: A vibration exciter, particularly for a vibration pile driver, comprising at least two axles disposed parallel to one another, as well as at least two imbalance masses, which are attached to one or more of the axles. The relative rotary position of the imbalance masses can be adjusted relative to one another by at least one rotary oscillating motor having a rotor shaft and a stator housing. The rotor shaft is an integral part of one of the axles, and the rotary position of the stator housing relative to the rotor shaft can be changed. The stator housing can be locked to the rotor shaft. An oscillating motor suitable for use in a vibration exciter, comprises a rotor shaft and a stator housing, between which working chambers are formed. The stator housing can rotate about the rotor shaft and can be locked relative to the rotor shaft.

Abstract: A stepping motor has a stator; and a rotor disposed to surround the stator. The stator includes annular first and second stator yokes disposed to face each other, each having a plurality of pole teeth formed along a circumference thereof, and an annular stator coil disposed between the first and second stator yokes. The rotor includes an annular magnet disposed to surround the first and second stator yokes, which has a plurality of magnetic poles formed along a circumference thereof, and a shaft disposed on a central portion of the magnet. A part of the plurality of pole teeth of the first stator yoke is a first commutating pole which has a width different from the widths of the other pole teeth. A part of the plurality of pole teeth of the second stator yoke is a second commutating pole which has a width different from the widths of the other pole teeth and the first commutating pole, and is disposed adjacent to the first commutating pole.

Abstract: A vibration apparatus and also a motor assembly are provided to enhance vibrational massage therapy and to improve non-impact exercise. In particular, the motor assembly generates vibrations of differing amplitudes utilizing a single motor to drive a shaft that, in turn, rotates an eccentric weight whose rotational axis is non-coaxial with the shaft's rotational axis. The reversal of the direction in which the motor rotates the shaft changes the amplitude of the resulting vibrations communicated to a platform. Thus, vibrational amplitude most suitable for a particular application or purpose may be selected.

Abstract: A vibration motor that includes a base and a case which form an internal space, a shaft rotatably inserted in the base and the case, a rotor inserted onto the shaft and configured to rotate, which includes multiple wound coils and a commutator connected to the wound coils, a weight attached to a lower surface of the rotor, a brush which is in contact with the commutator and which is positioned on the base, and a magnet facing the rotor, can increase vibration and reduce electrical consumption during operation.

Abstract: An electric motor (100) for controlling the lateral displacement of a shaft (114) connected to a rotor (104) of the electric motor (100) is provided. The electric motor (100) includes one or more stator conductors (106) for carrying a current and one or more permanent magnets (108) to produce a magnetic field (504). The one or more stator conductors (106) interact with the magnetic field (504) when the power is applied, to purposely generate a force with an axial (Fa) and a circumferential component (Fc). The electric motor (100) includes the shaft (114) that travels along a rotor axis (506) in an axial direction when the power is applied, under an action of the axial component of the force. However, when the power is removed, the shaft (114) retracts under the action of a biasing force from a tension device (118).

Abstract: A vibration stator includes a housing (30), a stator (10) received in the housing and a rotor (20) being rotatably disposed in the stator. The stator includes two claw-pole assemblies (11) arranged back-to-back and located at two opposite ends of the vibration motor symmetrically. Each claw-pole assembly includes two yokes (10a, 10b) each having a plurality of pole teeth (16a, 16b) extending therefrom and being intermeshed with those of the other yoke. The rotor includes a permanent magnet (26) and an eccentric weight (24) connected with the permanent magnet.

Abstract: A vibration motor includes a housing, a stator (10) received in the housing (30) and a rotor (20) rotatably disposed in the stator. The stator includes two claw-pole assemblies (11) arranged back-to-back, and a shaft (23) being fixedly connected with the two claw-pole assemblies. The rotor includes a bearing (22) rotatably mounted around the shaft, a permanent magnet (26) mounted around the bearing, and an eccentric weight (24) fixedly attached to the permanent magnet. The eccentric weight includes a main body (240) and at least one inserting portion (244) having a density higher than that of the main body.

Abstract: A linear vibration motor comprising a movable unit, a base assembly having a coil assembly, a housing and an elastic member, in which the movable unit has the maximum mass from a fixed housing volume. The elastic member has the outer periphery fixed to the ceiling of the housing and the inner periphery fixed to the top of the movable unit opposed to the outer periphery. The elastic member is deformable to the extent that the outer and inner peripheries are shift to a coplanar position from a parallel position where they are spaced for a predetermined distance from each other. The core assembly is distanced downward from the movable unit or a predetermined gap.

Abstract: The present invention relates to a flat type vibration motor and a rotor structure, which can increase a vibration amount of the vibration motor by the rotor structure adapted to increase a volume of a weight formed on a substrate. The weight is formed with the stepped portion formed on the surface thereof, which is contacted with the substrate and the substrate is formed on an inserting hole or an inserting groove corresponding to the stepped portion, so that the stepped portion can be engaged with the inserting hole or the inserting groove. Alternatively, the weight is formed with a mounting groove and the substrate is formed with the inserting hole or the inserting groove and the fixing bar.

Abstract: A vibration motor includes a stator assembly, a rotor assembly, a shaft and a pair of brushes having different osculatory tracks. The stator assembly includes a magnet and a lower substrate. The rotor assembly has an eccentric weight, and includes a commutator positioned on the lower surface thereof and a coil. The shaft is inserted into a rotary center of the rotor assembly for forming a rotary shaft of the rotor assembly.

Abstract: A stator includes a bracket having a shaft bearing portion at a center, a stator base including a flexible printed wiring board outwardly attached to the shaft bearing portion, single-phase air-armature coils disposed on the stator base, and a drive circuit member disposed on the stator base so as not to overlap with the single-phase air-core armature coils. The bracket has a through hole at the section corresponding to the bottom of the drive circuit member. The stator base is embedded at least partly in the thickness direction in the through hole and fixed using a resin, and a detent torque generation member is contained in, and is no thicker than, the stator base.

Abstract: An electronic device includes a plurality link bars, a plurality of magnetic devices, a first module and a second module connected to the first module in a slideable manner. The magnetic devices are disposed at connecting nodes where the link bars are connected to each other. One connecting node of the link bars is fixed at the first module of the electronic device, and another connecting node of the link bars is fixed at the second module of the electronic device. The first and second modules are open and closed in a semi-automatic manner based on magnetic force formed between the magnetic devices disposed at the connecting nodes.

Abstract: A vibration motor having a tubular case, a shaft protruding from a front end of the case, a weight eccentrically fixed to an end of the shaft, and a metallic holder surrounding the case, the holder being surface-mounted on a wiring board by reflow-soldering, wherein the holder has a planate bottom placed on the wiring board, a pair of forward tilting prevention portions that extends up to a position facing the weight is formed at the bottom, a notch is provided on a center line extending along the bottom between the forward tilting prevention portions, and the notch extends from the front end of the forward tilting prevention portions beyond the position facing the weight.

Abstract: A stepping motor for generating vibration is provided and includes a stator and a rotor. The rotor includes a shaft, a ring magnet and a rotor frame, and the rotor frame is formed into a substantial cup-shape including a disk portion having an opening at the center and also including a cylindrical portion continuously arranged at the periphery of the disk portion, and a weight portion is arranged in a portion of the rotor frame so that the gravity center of the rotor frame an be located at a position eccentric with respect to the center of the rotor frame.

Abstract: The present invention is constituted such that a motor is small in size and can be mounted simply, with a sure electrical connection by means of power terminals. There is provided a terminal seat made of insulating resin fitted and fixed to one end of a motor housing, a pair of support pins are held by the terminal seat so as to project in a direction approximately parallel to a surface of a circuit board and in a cylinder axial direction of the motor housing from the end surface of the terminal seat, respective leads of a motor drive circuit are provided in a plane direction perpendicular to the cylinder axial direction of the motor housing so as to come out from the terminal seat, and there are provided a pair of torsion coil springs as the power terminals that have central spirals fitting over the axes of support pins, ends projecting outward from the terminal seat as points of contact with power supply lands, and opposite ends connected to leads.

Abstract: A printed wiring board includes a commutator at a rotation center thereof on one side and a bearing at the rotation center on the other side, first, second and third wound air-core coils having an effective conductor opened to the magnetic pole opening angle, and an eccentric weight comprising a main component and a supplementary part formed so as to be no thicker than the first wound air-core coil and disposed so that the main component does not protrude axially upward of the second and third wound air-core coils.

Abstract: Because the bearing of an eccentric rotor is small, when it is integrated in a rotor by resin molding, the bearing unit can be fractured by impacts unless it has a sufficient mounting strength. Accordingly, an eccentric rotor is provided in which a sufficient mounting strength of the bearing on the rotor is ensured and the bearing unit is prevented from fracture by impacts. Also a vibration motor using the eccentric rotor is provided. The eccentric rotor includes a printed wiring board, a cylindrical bearing for insertion of a shaft, and a weight which are integrated to have a flat disk shape by resin molding. A shaft insertion hole has a diameter larger than the outer diameter of the shaft and smaller than the outer diameter of the bearing, and the bearing is integrated by resin molding in a state in which the entire periphery at the end portion thereof is disposed in contact with the printed wiring board around the insertion hole.

Abstract: A vibrator of the present invention comprises a coreless coil (2), a driver (4) including a magnet (4a) inserted in the coreless coil (2), a yoke (4b) for pinching the coreless coil (2) and facing the magnet (4a), and a top plate (4c), suspensions (6 and 8) for carrying resiliently the driver (4). The driver (4) is reciprocated in an axial direction of the coreless coil (2) by applying an alternate current to the coreless coil (2) to generate vibrations. The vibrator can be miniaturized without increasing a cost and has a good rising of vibrations.

Abstract: A vibrator motor has a stationary piece and a moving piece hinged at one end. The moving piece does not generate substantial internal spring forces under the influence of an electromagnetic field, because it does not have a tail bracket. Other parts of conventional motors are also eliminated, so the motor is easier and less expensive to manufacture. In addition, the motor can be assembled and tuned before installation, which increases the ability to automate assembly.

Abstract: A driver IC and passive parts, which convert a direct current voltage into a three-phase voltage, and an FP coil for cyclically generating a magnetic field through the driver IC are mounted on a flexible substrate, which constitutes a small vibration motor. The driver IC is a so-called bare chip in which a circuit section is exposed and is not molded with resin and the like. Magnets and an unbalance weight are installed on a yoke having a shaft. The FP coil and the magnet are placed so as to face each other. A cover is caulked to fixed to a bottom plate. Thus, the vibration motor can be miniaturized and thinned. Moreover, the vibration motor can be automatically manufactured, and installing them to an electronic apparatus can be automatically performed.

Abstract: A surface-mountable linear vibrator includes a hollow cylindrical housing of a predetermined thickness having a space therein. An elastic member is fixed to an inner surface of the housing. A vibrating body includes a yoke fixed to the elastic member to be affected by elastic force in an axial direction of the housing, a weight fixed to the yoke, and a magnet fixed to the yoke. A circular substrate member is attached to a lower part of the housing, and provided with (i) a winding coil fixed to the upper surface thereof and (ii) a connection element formed on the lower surface thereof and electrically connected to the winding coil. Power is applied to the winding coil through the connection element.

Abstract: A multi-mode vibration generating device for a communication terminal includes a first vibration generator and one or more second vibration generators. The first vibration generator includes a first coil assembly and a first magnet and generating a vibration of a given direction by an interaction between an electric field generated by the first coil assembly and a magnet field generated by the first magnet. The one or more second vibration generators include a second coil assembly and a second magnet and generate a vibration of a given direction by an interaction between an electric field generated by the second coil assembly and an magnet field generated by the second magnet. The second vibration generator generates a vibration of a direction or frequency different from a vibration direction or frequency of the first vibration generator, whereby various mode vibrations are generated.

Abstract: A vibration motor includes a stator assembly, a rotor assembly, a shaft and a pair of brushes having different osculatory tracks. The stator assembly includes a magnet and a lower substrate. The rotor assembly has an eccentric weight, and includes a commutator positioned on the lower surface thereof and a coil. The shaft is inserted into a rotary center of the rotor assembly for forming a rotary shaft of the rotor assembly.

Abstract: Disclosed is an improved flat vibration motor to be disposed in a mobile communication terminal, etc. for generating a vibration signal. A brushless-type vibration motor without brushes and a commutator is adopted, instead of a brush-type vibration motor with the brushes and commutator. An eccentric portion is disposed on one side of the peripheral surface of a rotor made of a permanent magnet, and one or more pairs of hall sensors are mounted in the vibration motor so as to start and drive the vibration motor. A motor controller may be used as internally or externally disposed on the vibration motor. The arrangement of a stator coil is improved so as to reduce the loss of magnetic flux as well as remove the non-operation points, thereby preventing the starting and driving disorders of the vibration motor, and improving its performance and efficiency.

Abstract: A bar-type vibration motor has a stator unit including a body and a magnet attached in the body; a rotor unit including a rotary shaft having one end fixed to an eccentric weight and the other end fixed to a stationary member, a portion of the rotary shall adjacent to the eccentric weight being rotatably supported by the body like a cantilever, a commutator having several segments attached on one side of the stationary member, and an armature fixed to the stationary member spaced apart from the magnet, and electrically connected with the commutator; and a power supply unit including a fixing cap faxed to the body and a brush mounted on the fixing cap to supply voltage to the armature.

Abstract: There is provided a vibration generator (40) in which a rotor with an unbalancer is rotated. The vibration generator includes a bottom plate (47) having a flat coil substrate (120) installed thereto, a stationary shaft (91) provided perpendicularly to the bottom plate, a magnet (85) installed on the stationary shaft (91) with a freely rotatable bearing being disposed between them and opposite to the surface of the flat coil substrate (120) with a slight clearance defined between them, and a weight (87) installed to the magnet (85). For generating a vibration, a current is supplied to the coil on the flat coil substrate (120) to rotate the magnet (85) and weight (87). The bottom plate (47) is formed from a nonmagnetic material. A thin magnetic plate (48) is installed at the side opposite to the magnet (85) with the bottom plate (47) being placed between the thin magnetic plate (48) and magnet (85).