JP2018160999A - Linear vibration motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a linear vibration motor which is power saving and easily miniaturized since components are easily handled and assembled, with high shock resistance, and a magnetic circuit is easily strengthened.SOLUTION: A linear vibration motor is provided with: a stator which has a cylindrical coil, and a stator magnet or a magnetic substance yoke projection located outside the coil; a support shaft which is fixed to the stator to penetrate the coil; and a movable body which has a movable body magnet located to face the stator magnet or the magnetic substance yoke projection on both sides of the coil, and is supported by the support shaft to be freely movable in an axial direction of the support shaft, positions the movable body at a predetermined position on the support shaft in a floating state by magnetic suction force between the movable body magnet and the stator magnet or the magnetic substance yoke projection, and constitutes a magnetic spring which strengthens magnetic fluxes penetrating the coil in a direction contributing to drive of the movable body.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a linear vibration motor that magnetically drives a mover to linearly vibrate and outputs the vibration.

  The linear vibration motor as described above is mounted on a portable terminal device or the like in order to notify a user of the portable terminal device, for example, an incoming call or an operation input by vibration. What was disclosed by literature 1-4 is known.

  The linear vibration motor described in Patent Document 1 is connected to a disk-shaped fixed body 2, a movable body (movable element) 6 accommodated in the fixed body 2, and the fixed body 2 and the movable body 6. On the other hand, a spring member (mechanical spring) 8 that supports the movable body 6 so as to be movable in the axial direction and a magnetic drive mechanism 5 that drives the movable body 6 in the axial direction are provided. By providing the gel-like damper member 9 disposed between the two, the resonance of the movable body can be effectively suppressed even when the spring member is connected to the movable body.

  The linear vibration motor (linear actuator) described in Patent Document 2 is a rectangular parallelepiped housing 220, a shaft 320 disposed in the housing 220 and connected to both longitudinal ends of the housing 220, and a shaft 320 that is movable. Combined masses (movable elements) 310, 330, springs (mechanical springs) 510 that surround portions of the shaft 320 to prevent the masses 310, 330 from contacting the housing 220, shafts 320, mass 310, An electromagnetic structure 300 that exerts a driving force on the mass so that the mass 310, 330 moves from the first position to the second position, surrounding at least a part of the mass 310, 330. By generating a haptic output with movement from one position to a second position, the mass can be moved in two directions with a relatively small configuration Unishi to have.

  The linear vibration motor (linear actuator) described in Patent Document 3 includes a rod-like movable element 4 having at least one permanent magnet 3a, 3b, 3c magnetized with an N pole and an S pole in the axial direction, and a movable element 4. The surrounding first coil 1a and second coil 1b have a cylindrical stator 2 arranged in the axial direction, and the phases of thrust generated in the first coil 1a and thrust generated in the second coil 1b The coil center pitch and the mover that pass alternating currents having different phases to the first and second coils 1a and 1b so as to be offset and connect the centers of the first and second coils 1a and 1b in the axial direction. By making the pitch between the magnetic poles 4 coincide with each other, the mover is reciprocated without using a mechanical spring.

  The linear vibration motor described in Patent Document 4 includes a rectangular parallelepiped housing 10 having an accommodation space, a first magnet 11 and a second magnet 13 each accommodated in the accommodation space and fixed to the housing 10, and the housing 10. While being floated inside, it has a clamp weight 120, a third magnet 121, a drive magnet 122, and a fourth magnet 123, and the magnetic pole of the third magnet 121 is opposed to the adjacent magnetic pole of the first magnet 11. Then, the vibrator unit (mover) 12 in which the magnetic pole of the fourth magnet 123 is opposed to the adjacent magnetic pole of the second magnet 13, the first magnet 11, the vibrator unit 12, the second magnet 13, and the like. Are arranged one by one along the vibration direction of the vibrator unit 12, and are further provided with a guide groove part having a magnetic guide groove and a magnetic floating at least partially wrapped in the magnetic guide groove. A guide rail part having an inner rail, the engaging structures 15 and 16 which float the vibrator unit 12 in the housing 10 and move along the vibration direction, and are housed in the housing space, The vibrator unit is floated without using a mechanical spring by providing the drive coil 14 with a gap and surrounding the drive magnet 122.

WO2015 / 141648A1 US2016 / 172953A1 WO2010 / 119788A1 US2016 / 226359A1

  However, since the vibration motors described in Patent Document 1 and Patent Document 2 both have the mover positioned by a mechanical spring, problems such as deformation of the mechanical spring are likely to occur during assembly. There is a problem that the degree of difficulty is very high, and there is also a problem that the impact resistance after the product is completed is low, which causes a characteristic change or a failure.

  On the other hand, although the vibration motors described in Patent Document 3 and Patent Document 4 do not use a mechanical spring for positioning the mover, the electromagnetic circuit is arranged so as to extend in the moving direction of the mover instead. Therefore, there is a problem that it is difficult to reduce the size of the housing.

  Therefore, the present invention advantageously solves the above problems in a vibration motor that drives the mover magnetically to linearly vibrate and outputs the vibration, and is easy to handle and assemble parts and has high impact resistance. Moreover, it is an object of the present invention to provide a linear vibration motor that is easy to reinforce because it can easily reinforce a magnetic circuit.

The linear vibration motor of this invention is
A stator having a cylindrical coil and a stator magnet or magnetic yoke protrusion located outside the coil;
A support shaft fixed to the stator so as to penetrate the coil;
A mover having a mover magnet positioned so as to face the stator magnet or the magnetic yoke projection with the coil interposed therebetween, and is supported by the support shaft so as to be movable in the axial direction of the support shaft. When,
With
The mover magnet is positioned in a floating state at a predetermined position on the support shaft by a magnetic attraction force between the mover magnet and the stator magnet or the magnetic yoke projection, and the mover is driven. The magnetic spring is configured to strengthen the magnetic flux penetrating the coil in a contributing direction.

  In the linear vibration motor of the present invention, the mover supported on the support shaft fixed to the stator so as to penetrate the cylindrical coil of the stator is movable in the axial direction. The mover magnet is positioned so as to face the stator magnet or magnetic yoke protrusion of the stator with the magnet sandwiched in between, and the mover magnet and the stator magnet or magnetic yoke protrusion facing it are magnetic springs. The magnetic spring is pulled back even if the mover moves in the axial direction on the support shaft to position the mover at a predetermined position on the support shaft in a floating state, and contributes to the drive of the mover. The magnetic flux penetrating the coil in the direction is strengthened, and the coil moves in one direction in the axial direction of the support shaft by the strengthened magnetic flux under the pulling back action of the magnetic spring. Move driven in reverse direction.

  Therefore, according to the linear vibration motor of the present invention, since a mechanical spring is not used, parts can be easily handled and assembled, impact resistance can be increased, and the magnetic spring strengthens the magnetic circuit. Therefore, it is possible to increase energy efficiency and save power, and since the magnetic spring pulling action works in the moving direction of the mover, there is no need to extend the electromagnetic circuit in the moving direction of the mover, and the magnetic circuit that drives the mover And the magnetic spring need not be provided separately, so that the stator can be easily downsized.

  In the linear vibration motor of the present invention, it is preferable that at least one of the mover magnet and the stator magnet or the magnetic yoke projection has a tapered shape in a portion facing the other. . In this way, the magnetic spring can concentrate and strengthen the magnetic flux penetrating the coil in the direction that contributes to the drive of the mover. In addition, the mover can be accurately positioned at a predetermined position.

  In the linear vibration motor of the present invention, it is preferable that the coil has a contour shape having an arcuate portion and a linear portion. In this way, the stator magnet or the magnetic yoke projection can be arranged outside the linear portion of the coil while making the outer peripheral contour of the stator circular, so that the stator can be easily downsized. In addition, since the portions of the mover magnet and the stator magnet that face the linear portion of the coil can be made linear, a stable magnetic circuit can be formed.

  Furthermore, in the linear vibration motor according to the present invention, the mover magnet is fitted into an inverse fitting portion of the mover whose width becomes narrower toward the stator magnet or the magnetic yoke projection. And preferred. In this way, the mover can be easily assembled and the impact resistance of the mover can be increased.

  Furthermore, in the linear vibration motor according to the present invention, the stator has a disk-shaped housing that accommodates the coil and the stator magnet, and the support shaft is arranged at the center of the housing. It is preferable that it is fixed to the housing in an arrangement extending in the axial direction. In this way, the stator and thus the entire linear vibration motor can be easily downsized.

  On the other hand, in the linear vibration motor according to the present invention, the stator includes a disk-shaped housing in which the coil is housed and the magnetic yoke protrusion is formed inwardly toward the outer peripheral surface of the coil. Preferably, the support shaft may be fixed to the housing in an arrangement extending in the axial direction of the housing at the center of the housing. In this way, the stator can be simply configured by omitting the stator magnet, and the stator and thus the entire linear vibration motor can be easily downsized.

It is a perspective view which shows the external appearance of 1st Embodiment of the linear vibration motor of this invention in the state seen from the upper side. It is a disassembled perspective view which shows the structure of the linear vibration motor of the said 1st Embodiment in the state seen from the upper side. It is a disassembled perspective view which shows the structure of the linear vibration motor of the said 1st Embodiment in the state seen from lower side. (A) is a perspective view which shows the needle | mover of the linear vibration motor of the said 1st Embodiment, (b) is a perspective view which shows the needle | mover with the bracket of a stator, a board | substrate, a stator magnet, and a shaft, (c) ) Is a perspective view showing the mover together with a stator bracket, a substrate, a stator magnet, a coil and a shaft. (A) is a top view which shows the linear vibration motor of the said 1st Embodiment, (b) is sectional drawing which follows the AA line in (a), (c) is B- in (a). It is sectional drawing which follows a B line. (A) is a perspective view which shows the case which comprises the housing of 2nd Embodiment of the linear vibration motor of this invention, (b) shows the mover magnet of the needle | mover of the linear vibration motor of the 2nd embodiment. A perspective view, (c) is a perspective view showing a bracket of the stator of the linear vibration motor of the second embodiment, and (d) is a perspective view showing the bracket together with a mover magnet of the mover. It is sectional drawing which shows the linear vibration motor of the said 2nd Embodiment in the cross-sectional position similar to FIG.5 (c).

  Embodiments of a linear vibration motor according to the present invention will be described below in detail with reference to the drawings. FIG. 1 is a perspective view showing the appearance of the first embodiment of the linear vibration motor of the present invention as viewed from above, and FIG. 2 is a view of the configuration of the linear vibration motor of the first embodiment as viewed from above. FIG. 3 is an exploded perspective view showing the configuration of the linear vibration motor of the first embodiment as viewed from below.

  4A is a perspective view showing the mover of the linear vibration motor of the first embodiment, and FIG. 4B shows the mover together with a stator bracket, a substrate, a stator magnet, and a shaft. FIG. 4C is a perspective view showing the mover together with a stator bracket, a substrate, a stator magnet, a coil and a shaft, and FIG. 5A is a linear vibration of the first embodiment. FIG. 5B is a cross-sectional view taken along the line AA in FIG. 5A, and FIG. 5C is a cross-sectional view taken along the line BB in FIG. 5A. FIG.

  As shown in FIG. 1, the linear vibration motor according to the first embodiment has a generally disk shape as a whole and includes a disk-shaped housing 1 that constitutes a stator. As shown in FIGS. 2 and 3, the housing 1 has a shallow circular container-like case 2 having a short cylindrical shape and having a flat portion at one end in the axial direction, and an opening which is the other end of the case 2. The case 2 and the bracket 3 are made of steel or stainless steel.

  The linear vibration motor according to the first embodiment is also provided with a support shaft fixed to the housing 1 in an arrangement extending in the axial direction of the housing 1 at the center of the housing 1 as shown in FIGS. The shaft 4 is formed of high-strength stainless steel or the like. A recess 2 a that fits with the shaft 4 is formed at the center inside the flat portion of the case 2, and a notch 2 b that fits with the bracket 3 is formed at the open end of the case 2. A recess 3 a that fits with the shaft 4 is formed at the center of the bracket 3, and a notch 3 b that fits with the open end of the case 2 is formed at the outer peripheral edge of the bracket 3.

  The case 2 and the bracket 3 are fitted to each other and fixed to each other by welding or the like, and the shaft 4 is fixed to both the case 2 and the bracket 3 by fitting, press-fitting, welding, or the like. In the illustrated example, the lower end portion of the shaft 4 is welded after being press-fitted into the concave portion 3 a at the center portion of the bracket 3, and the upper end portion of the shaft 4 is fitted into the concave portion 2 a at the central portion of the flat portion of the case 2. ing.

  As shown in FIGS. 2 and 3, the linear vibration motor according to the first embodiment is also positioned on the outside of the thin plate-like substrate 5 and the cylindrical coil 6 that constitute the stator, and the coil 6, respectively. A plurality of stator magnets 7 in the illustrated example are provided.

  The substrate 5 is formed of a flexible printed wiring board (FPC) or the like, and is laminated on the insulating resin layer 5a having a disk-shaped portion and a rectangular protruding portion protruding from the outer peripheral edge thereof, and the insulating resin layer 5a. And a copper foil 5b for forming two electric circuits from the power terminal portion (rectangular portion) 5c to the coil connecting portion (substantially semicircular portion) 5d. Portions of the copper foil 5b other than the power supply terminal portion 5c and the coil connection portion 5d are electrically insulated from the outside by the insulating resin layer 5a. In the illustrated example, the substrate 5 has a structure in which a copper foil 5b is sandwiched between two insulating resin layers 5a. The two power terminal portions 5c and the two coil connection portions 5d of the copper foil 5b are as follows. The insulating resin layer 5a is exposed to the outside through openings formed in the protruding portion and the disc-like portion. The substrate 5 is fixed to the bracket 3 with a double-sided tape 8 or the like.

  The coil 6 is wound with a magnet wire or the like and is formed in a substantially cylindrical shape with an oval cross section having two linear portions 6 a and two arc-shaped portions 6 b, and the shaft 4 is coiled inside the coil 6. The coil 6 penetrates along the axis and is fixed to the substrate 5 with an adhesive or the like in such an arrangement that one end in the axial direction of the coil 6 is in close contact with the substrate 5. Two end lines (not shown) of the coil 6 are electrically connected to two coil connection portions 5d of the substrate 5 by soldering, welding, or the like.

  Each of the two stator magnets 7 is composed of a neodymium magnet or the like, and is magnetized in the radial direction of the shaft 4 (a direction facing a mover magnet 10 described later). As shown in FIGS. 4 and 5, each stator magnet 7 is fixed to the case 2 or the bracket 3 by adhesion or the like at a position close to the linear portion 6 a of the coil 6 outside the coil 6. In the illustrated example, each stator magnet 7 is fixed to the inner peripheral surface of the case 2 with an adhesive (not shown).

  As shown in FIGS. 2 and 3, the linear vibration motor according to the first embodiment further includes weights 9, two mover magnets 10 and bearings 11 constituting the movers, and each stator. The area of the portion of the magnet 7 that faces the mover magnet 10 with the linear portion 6a of the coil 6 interposed therebetween is equal to the area of the stator magnet 7 that is sandwiched between the linear portions 6a of the coils 6 of each mover magnet 10. Is substantially the same as the area of the portion facing.

  The weight 9 is made of a high specific gravity material such as a tungsten alloy and is formed in a substantially disc shape. A center hole 9a for fixing the bearing 11 by press-fitting or the like is formed in the center portion of the weight 9, and a fitting portion for fixing the mover magnet 10 at a position opposed to each other in the diametrical direction of the outer peripheral edge portion of the weight 9 A fitting groove 9b is formed. The fitting groove 9b for fixing the mover magnet 10 is directed toward the stator magnet 7 by a taper shape to prevent the mover magnet 10 from falling off radially outward, which is the direction facing the stator magnet 7. It is made into the inverse (ant groove | channel) shape where opening width narrows as it goes.

  Each of the two mover magnets 10 is made of a neodymium magnet or the like, and is magnetized in the radial direction of the shaft 4 (direction facing the stator magnet 7). Each mover magnet 10 has a tapered shape similar to the fitting groove 9 b at the outer peripheral edge of the weight 9. Due to this taper shape, the area of the mover magnet 10 in the vicinity of the stator magnet 7 is made smaller so that the magnetic flux between the stator magnet 7 and the stator magnet 7 converges. Each mover magnet 10 is fixed in the fitting groove 9b of the weight 9 by adhesion or the like.

  The bearing 11 is formed in a substantially cylindrical shape with an oil-impregnated bearing material such as iron / copper, and is fixed in the center hole 9a of the weight 9 by press fitting or the like. The shaft 4 is inserted into the hole in the center of the bearing 11 so as to be slidable in the axial direction.

  When assembling the linear vibration motor of the first embodiment, as shown in FIG. 4A, the bearing 11 is press-fitted into the weight 9 and the mover magnet 10 is adhered to constitute the mover M. On the other hand, the stator magnet 7 is bonded to the case 2 to form the stator S1, and the shaft 4 is press-fitted and welded to the bracket 3 and the substrate 5 is attached with the double-sided tape 8 as shown in FIG. Next, as shown in FIG. 4 (c), the coil 6 is bonded to the substrate 5 and the end line of the coil 6 is connected to form the stator S2. Then, the stator 4 is connected to the shaft 4 of the stator S2. After inserting the mover M, the bracket 3 of the stator S2 and the case 2 of the stator S1 are fitted and welded to assemble a linear vibration motor.

  In the linear vibration motor according to the first embodiment, the mover M when the coil 6 is not energized has the mover magnet 10, the stator magnet 7, and the like by a magnetic flux as indicated by a virtual line in FIG. As shown in FIGS. 5B and 5C, the mover magnet 10 and the stator magnet 7 sandwich the coil 6 between the axial direction and the circumferential direction of the shaft 4 that are most stable due to the magnetic attractive force between them. When the mover M is moved in the axial direction of the shaft 4 from the stable position of the magnetic attraction force due to an external force or the like, the position is stopped in a floating state. Since an urging force (retraction force) that tries to return acts on the mover M, the mover magnet 10 and the stator magnet 7 function as magnetic springs. Further, when the mover M tries to rotate in the circumferential direction of the shaft 4, the urging force for returning to the stable position of the magnetic attraction force suppresses the rotation of the mover M.

  In this state, when a voltage is applied between the power supply terminal portions 5c of the substrate 5 and the coil 6 disposed between the mover magnet 10 and the stator magnet 7 is energized, it is movable according to Fleming's left-hand rule. The child M is driven in the axial direction of the shaft 4 and moves to a position that balances the biasing force (retraction force) of the magnetic spring by the magnetic attractive force between the mover magnet 10 and the stator magnet 7. Here, when the voltage applied to the coil 6 is, for example, a sine wave or a rectangular wave whose polarity is alternately inverted, the mover M reciprocates in the axial direction of the shaft 4. In particular, if the frequency of the applied voltage waveform is substantially matched with the natural frequency of the mass of the mover M supported by the magnetic spring, a reciprocating motion with the maximum amplitude can be obtained by resonance.

  Further, for example, even when the polarity of the voltage applied to the coil 6 is not changed, the movable element M is driven in one direction in the axial direction of the shaft 4 by intermittently applying the voltage, and the above-described magnetism is applied when the coil 6 is not energized. It is also possible to reciprocate the mover M by repeating the operation of returning the mover M to the stable position by the magnetic attractive force (retraction force) of the spring.

  FIG. 6A is a perspective view showing a case constituting the housing of the second embodiment of the linear vibration motor of the present invention, and FIG. 6B shows the movable of the mover of the linear vibration motor of the second embodiment. FIG. 6C is a perspective view showing a stator bracket of the linear vibration motor of the second embodiment, and FIG. 6D is a perspective view showing the child magnet together with the mover magnet of the mover. FIG. 7 is a cross-sectional view showing the linear vibration motor of the second embodiment at the same cross-sectional position as FIG.

  In the linear vibration motor of the second embodiment, the stator magnet 7 in the linear vibration motor of the first embodiment is omitted, and instead, the magnetic yoke projection 3c is provided integrally with the bracket 3 on the bracket 3, A taper that inclines in the axial direction of the shaft 4 is provided at the end of the mover magnet 10 that faces the tip of the magnetic yoke protrusion 3c. The magnetic yoke protrusion 3c is, for example, the outer peripheral edge of the bracket 3 It can be formed by bending two rectangular convex portions projecting in the diametrical direction facing each other from the portion, and then bending inward at the intermediate portion. The case 2 is provided with an escape portion 2c in order to avoid interference with the magnetic yoke protrusion 3c when the bracket 2 is fitted.

  The front end surface of the magnetic yoke protrusion 3c of the stator and the front end surface of the front end portion of the mover magnet 10 that is tapered and inclined in the axial direction of the shaft 4 have substantially the same area. The magnetic flux converging effect similar to that in the first embodiment is produced, and the function of the magnetic spring is exhibited.

  Therefore, according to the linear vibration motors of the first and second embodiments, since mechanical springs are not used, parts can be easily handled and assembled, and impact resistance can be increased. Since the magnetic circuit is strengthened, the energy efficiency can be improved and the power can be saved, and since the retracting action of the magnetic spring works in the moving direction of the mover M, there is no need to extend the electromagnetic circuit in the moving direction of the mover. Since it is not necessary to separately provide a magnetic circuit and a magnetic spring for driving the mover, the stator can be easily downsized.

  Furthermore, according to the linear vibration motors of the first and second embodiments, the mover magnet 10 is opposed to the stator magnet 7, and the magnetic yoke projection 3 c and the mover magnet 10 are opposed to each other. Since the opposing portion has a tapered shape, the magnetic spring can concentrate and strengthen the magnetic flux penetrating the coil 6 in a direction that contributes to driving the mover M, and the mover can be strengthened. Can be accurately positioned at a predetermined position.

  Furthermore, according to the linear vibration motors of the first and second embodiments, the coil 6 has a contour shape having an arcuate portion 6b and a linear portion 6a, so that the housing constituting the stator. Since the stator magnet 7 or the magnetic yoke projection 3c can be arranged outside the linear portion 6a of the coil 6 while making the outer peripheral contour shape of the circle 1 circular, the housing 1 can be easily downsized, Since the part facing the linear part 6a of the coil 6 of the mover magnet 10 and the stator magnet 7 can be made linear, a stable magnetic circuit can be formed.

  Furthermore, according to the linear vibration motors of the first and second embodiments, the mover magnet 10 has an inverse width that decreases in width toward the stator magnet 7 or the magnetic yoke protrusion 3c of the weight 9 of the mover M. Since the fitting groove 9b is fitted in the shape, the movable piece M can be easily assembled and the impact resistance of the movable piece M can be improved.

  Furthermore, according to the linear vibration motor of the first embodiment, the stator has the disk-shaped housing 1 that houses the coil 6 and the stator magnet 7, and the shaft 4 is located at the center of the housing 1. Since the housing 1 is fixed to the housing 1 so as to extend in the axial direction, the housing 1 and the entire linear vibration motor can be easily downsized.

  On the other hand, according to the linear vibration motor of the second embodiment, the stator accommodates the coil 6 and has a disk shape in which the magnetic yoke protrusion 3c is formed inwardly toward the outer peripheral surface of the coil 6. Since the shaft 4 is fixed to the housing 1 in an arrangement extending in the axial direction of the housing 1 at the center of the housing 1, the stator magnet 7 is omitted and the stator is omitted. The housing 1 and thus the entire linear vibration motor can be easily downsized.

  The linear vibration motor according to the present invention has been described above based on the illustrated embodiment. However, the linear vibration motor of the present invention is not limited to the above-described embodiment, and can be appropriately changed within the scope of the claims. For example, a stator The number of the magnets 7 and the mover magnets 10 may be three or more instead of two each. In that case, the linear portion 6a of the coil 6 may be a plurality of three or more, the same number as the stator magnets 7 and the mover magnets 10, instead of two each.

  Further, the taper shape for concentrating the magnetic flux between the mover magnet 10 and the stator magnet 7 or the magnetic yoke projection 3c does not need to be provided only in the mover magnet 10, and is fixed to the mover magnet 10. It may be provided on both the child magnet 7 and the magnetic yoke protrusion 3c, or may be provided only on the stator magnet 7 or the magnetic yoke protrusion 3c.

  The tapered shape need not be provided only in the circumferential direction of the shaft 4, and may be provided in both the circumferential direction of the shaft 4 and the axial direction of the shaft 4, and provided only in the axial direction of the shaft 4. Also good. The magnetic yoke protrusion 3c may be provided integrally with the case 2 in the same manner without being provided integrally with the bracket 3, or may be separately formed with a magnetic material and fixed to the case 2 or the bracket 3. It may be provided.

  Thus, according to the linear vibration motor of the present invention, since a mechanical spring is not used, parts can be easily handled and assembled, impact resistance can be increased, and the magnetic spring strengthens the magnetic circuit. Energy efficiency can be improved by saving energy, and the magnetic spring pulling action works in the moving direction of the mover, so there is no need to extend the electromagnetic circuit in the moving direction of the mover. Since it is not necessary to provide a magnetic spring separately, the stator can be easily downsized.

DESCRIPTION OF SYMBOLS 1 Housing 2 Case 2a, 3a Recessed part 2b, 3b Notch 2c Escape part 3 Bracket 3c Magnetic body yoke protrusion part 4 Shaft 5 Board | substrate 5a Insulation resin layer 5b Copper foil 5c Power supply terminal part 5d Coil connection part 6 Coil 6a Linear part 6b Arc-shaped part 7 Stator magnet 8 Double-sided tape 9 Weight 9a Central hole 9b Fitting groove 10 Movable magnet 11 Bearing M Movable element S1, S2 Stator

Claims (6)

A stator having a cylindrical coil and a stator magnet or magnetic yoke protrusion located outside the coil;
A support shaft fixed to the stator so as to penetrate the coil;
A mover having a mover magnet positioned so as to face the stator magnet or the magnetic yoke projection with the coil interposed therebetween, and is supported by the support shaft so as to be movable in the axial direction of the support shaft. When,
With
The mover magnet is positioned in a floating state at a predetermined position on the support shaft by a magnetic attraction force between the mover magnet and the stator magnet or the magnetic yoke projection, and the mover is driven. A linear vibration motor comprising a magnetic spring that strengthens a magnetic flux penetrating the coil in a contributing direction.   2. The linear vibration according to claim 1, wherein at least one of the mover magnet and the stator magnet or the magnetic yoke projection has a tapered shape in a portion facing the other. motor.   The linear vibration motor according to claim 1, wherein the coil has a contour shape having an arc-shaped portion and a linear portion.   The said mover magnet is fitted to the fitting part of the inverse shape of which the width | variety becomes narrow as it goes to the said stator magnet or magnetic body yoke projection part of the said mover, The Claim 1 to 3 characterized by the above-mentioned. The linear vibration motor according to any one of the above. The stator has a disk-shaped housing that houses the coil and the stator magnet,
5. The linear device according to claim 1, wherein the support shaft is fixed to the housing in an arrangement extending in an axial direction of the housing at a central portion of the housing. Vibration motor. The stator includes a disk-shaped housing in which the magnetic yoke protrusion is formed to receive the coil and to face inward toward the outer peripheral surface of the coil.
5. The linear device according to claim 1, wherein the support shaft is fixed to the housing in an arrangement extending in an axial direction of the housing at a central portion of the housing. Vibration motor.

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