JP2018202287A - Vibration motor - Google Patents

Abstract

To provide a vibration motor which enables improvement of assemblability and durability.SOLUTION: A vibration motor includes a solid damper part 9 disposed above a vibrator 7. A housing C1 has a top plate part 21 located on the damper part 9. The damper part 9 is fixed to one of an upper surface of the vibrator 7 and a lower surface of the top plate part 21. The damper part 9 contacts with both of the vibrator 7 and the top plate part 21 in a non-operational state of the vibrator 7.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a vibration motor.

  Conventionally, various devices such as a smartphone are provided with a vibration motor. There are types of vibration motors that perform linear vibration in the horizontal direction and types that perform linear vibration in the vertical direction. Humans who are users are more likely to feel vertical vibrations than horizontal vibrations. An example of a conventional longitudinal linear vibration type vibration motor is disclosed in Patent Document 1.

  The vibration motor of Patent Document 1 includes a stator and a vibrating body. The stator has a case and a bracket. The vibrating body has a weight and a magnet. A magnetic fluid is disposed on the lower surface of the magnet. The magnetic fluid faces the bracket.

  The magnetic fluid is used for suppressing the occurrence of wear or the like due to collision between the vibrating body and the bracket when the vibrating body is driven.

US Patent Application Publication No. 2013/0033126

  However, although the magnetic fluid is used in Patent Document 1, it is not easy to apply and hold the magnetic fluid at a desired position of the magnet. Therefore, the assemblability as a vibration motor is not good. Further, since the magnetic fluid and the bracket are separated from each other, the vibrating body moves when the vibration motor is dropped, and the weight of the vibrating body is likely to come into contact with the bracket. Thereby, durability of a vibration motor falls.

  In view of the above situation, an object of the present invention is to provide a vibration motor that can improve assemblability and durability.

An exemplary vibration motor of the present invention includes a stationary part having a housing and a coil,
A vibrating body including a magnet and supported to be able to vibrate in a vertical direction with respect to the stationary portion;
An elastic member disposed between the casing and the lower surface of the vibrating body;
A solid damper portion disposed on the upper side with respect to the vibrating body;
With
The housing has a top plate portion located on the upper side of the damper portion,
The damper portion is fixed to one of the upper surface of the vibrating body and the lower surface of the top plate portion,
The damper portion is configured to contact both the vibrating body and the top plate portion when the vibrating body is not in operation.

  According to the vibration motor of the present invention, assembling property and durability can be improved.

FIG. 1 is a perspective view showing an appearance of the vibration motor according to the first embodiment of the present invention. FIG. 2 is a cross-sectional perspective view taken along line AA in FIG. 3 is a cross-sectional view taken along line AA in FIG. FIG. 4 is a partial cross-sectional perspective view of the vibration motor cut downward. FIG. 5 is a longitudinal sectional view of a vibration motor according to the second embodiment of the present invention. FIG. 6 is a longitudinal sectional view of a vibration motor according to a third embodiment of the present invention. FIG. 7 is a longitudinal sectional view of a vibration motor according to the fourth embodiment of the present invention. FIG. 8 is a schematic view showing a haptic device according to an embodiment of the present invention.

  Hereinafter, exemplary embodiments of the present invention will be described with reference to the drawings. Note that the direction in which the central axis J of the vibration motor extends is the “vertical direction”, and for example, the upper side in FIG. The radial direction centered on the central axis J is simply referred to as “radial direction”, and the circumferential direction centered on the central axis J is simply referred to as “circumferential direction”. Note that the above-mentioned “vertical direction” does not indicate the positional relationship or direction when incorporated in an actual device.

<1. First Embodiment>
FIG. 1 is a perspective view showing an appearance of the vibration motor 15 according to the first embodiment of the present invention. FIG. 2 is a cross-sectional perspective view taken along line AA in FIG. 3 is a cross-sectional view taken along line AA in FIG.

  The vibration motor 15 includes a stationary part 10, a vibrating body 7, an elastic member 8, and a damper part 9. The stationary part 10 includes a housing C 1, an FPC (flexible printed circuit board) 3, a coil 4, a first yoke part 5, and a second yoke part 6.

  The housing C1 includes a base plate 1 and a case 2. The base plate 1 is a plate-like member made of, for example, a cold rolled steel plate. The base plate 1 extends in a direction perpendicular to the central axis J.

  The case 2 is a cylindrical cover member having a top plate portion 21 at the upper end. That is, the case 2 has an opening 22 at the lower end. Case 2 is made of, for example, SUS material. The base plate 1 includes a first base portion 11 having a substantially disc shape and a second base portion 12 having a substantially rectangular plate shape, and the first base portion 11 and the second base portion 12 are connected to each other. It has a configuration. By fitting the first base portion 11 into the opening 22, the case 2 is attached to the base plate 1 from above, and the case 2 is fixed to the base plate 1 by welding or fusion. The second base portion 12 is disposed outside the case 2.

  The FPC 3 is a substrate having wiring for supplying a current to the coil 4. The FPC 3 is configured by laminating a base film layer, a wiring layer, and a resist layer. The base film layer is made of polyimide, for example, and has flexibility and insulation. A wiring layer is comprised, for example with copper foil, and is arrange | positioned on a base film layer. The resist layer is made of, for example, polyimide, has an insulating property, and is disposed on the wiring layer. The resist layer is not disposed at a portion of the wiring layer that conducts to the outside, and the portion is exposed upward. The FPC 3 is fixed on the base plate 1 with an adhesive or an adhesive sheet.

  The FPC 3 includes a substantially disc-shaped first substrate portion 31 and a substantially rectangular plate-shaped second substrate portion 32, and the first substrate portion 31 and the second substrate portion 32 are connected to each other. The first substrate unit 31 is disposed on the first base unit 11. The first substrate portion 31 has two land portions 31A. The land portion 31 </ b> A is configured to extend in a circular arc shape in the circumferential direction on the radially outer side of the coil 4, and is exposed upward. A lead wire drawn from the coil 4 is electrically connected to the land portion 31A by soldering or the like. The second substrate unit 32 is disposed on the second base unit 12. The second substrate portion 32 has two terminal portions 32A exposed upward. Each of the terminal portions 32A is connected to each of the land portions 31A by a wiring layer. Thereby, a current can be supplied to the coil 4 by applying a voltage to the terminal portion 32A from the outside.

  The first yoke portion (central yoke) 5 has a columnar shape extending in the vertical direction as a whole, and has a base portion 51 and a protruding portion 52. The first yoke portion is made of, for example, cutting steel and has magnetism. The base 51 has a columnar shape extending in the vertical direction. The protrusion 52 has a cylindrical shape that protrudes downward from the base 51. The diameter of the protrusion 52 is smaller than the diameter of the base 51.

  The first base portion 11 has a fixing portion 111 that protrudes upward about the central axis J. The fixing portion 111 has a through hole 111A that penetrates in the vertical direction. The first yoke portion 5 is fixed to the fixed portion 111 by fitting the protruding portion 52 into the through hole 111 </ b> A and placing the base portion 51 on the fixed portion 111. The first yoke portion 5 is fixed by press-fitting or caulking at a position where the protruding portion 52 is fitted.

  The coil 4 is configured by, for example, winding a coil wire made of a fused polyurethane copper wire around the central axis J in the vertical direction. The lower part of the coil 4 is fitted on the radially outer side of the fixed part 111. The lower end surface of the coil 4 is fixed to the first substrate unit 31 by adhesion or an adhesive sheet. The coil 4 is disposed on the radially outer side of the first yoke portion 5. The upper end surface of the coil 4 coincides with the upper end surface of the base 51 in the vertical direction. That is, the upper end surfaces of the coil 4 and the base 51 constitute the same plane.

  The second yoke portion (back yoke) 6 is made of, for example, a cold-rolled steel plate and has magnetism. The second yoke portion 6 has a bottom portion 61 and a wall portion 62. The bottom portion 61 has a substantially disc shape having a thickness in the vertical direction, and is disposed on the same plane constituted by the upper end surfaces of the coil 4 and the base portion 51. The diameter of the bottom part 61 is larger than the outer diameter of the coil 4. That is, the bottom 61 extends from the central axis J to the outside in the radial direction of the coil 4.

  The wall portion 62 has a cylindrical shape that protrudes downward from the outer edge of the bottom portion 61. That is, the inner peripheral surface of the wall portion 62 is located on the radially outer side of the outer peripheral surface of the coil 4 and faces the outer peripheral surface in the radial direction. The second yoke portion 6 is fixed to the first yoke portion 5 by fixing the lower surface of the bottom portion 61 to the upper end surface of the base portion 51 with an adhesive or an adhesive sheet. In the state where no current flows through the coil 4, the center of a magnet 71 described later overlaps the wall portion 62 in the vertical direction. As a result, the vibration amount of the vibrating body 7 can be quickly raised from zero to the peak at the start of current supply to the coil 4 as compared with the configuration in which the center of the magnet 71 does not overlap the wall 62 in the vertical direction. In other words, the responsiveness at the start of operation of the vibration motor 15 can be improved.

  The vibrating body 7 includes a magnet 71, a weight 72, and a pole piece 73. The magnet 71 is made of, for example, a sintered neodymium magnet and has a substantially cylindrical shape having an annular shape in a top view. The weight 72 is made of, for example, a tungsten alloy and has a substantially cylindrical shape having an annular shape in a top view. The magnet 71 is disposed inside the weight 72 in the radial direction. The outer peripheral surface of the magnet 71 and the inner peripheral surface of the weight 72 are fixed by adhesion or an adhesive sheet. The pole piece 73 is an annular plate member made of, for example, SUS material and having magnetism. The pole piece 73 is disposed below the magnet 71 and is fixed to the lower surface of the magnet 71 by adhesion or an adhesive sheet.

  The elastic member 8 is a leaf spring member made of, for example, SUS material. Here, in order to show the structure of the elastic member 8, FIG. 4 shows a partially sectional perspective view of the vibration motor 15 cut downward. The elastic member 8 includes a first ring portion 81, a second ring portion 82 located below the first ring portion 81, and three connection portions 83 that connect the first ring portion 81 and the second ring portion 82. Have. Three locations arranged at equal intervals in the circumferential direction on the outer edge of the annular first ring portion 81 are connected to the inner edge of the second ring portion 82 by connection portions 83 extending in the circumferential direction while facing outward in the radial direction. The With such a configuration, the elastic member 8 can be expanded and contracted in the vertical direction.

  The elastic member 8 is disposed between the vibrating body 7 and the first base portion 11. The coil 4 is disposed on the radially inner side of the first ring portion 81. The elastic member 8 is fixed to the base plate 1 by fixing the lower surface of the second ring portion 82 to the upper surface of the first base portion 11 by welding or fusion. The elastic member 8 is fixed to the vibrating body 7 by fixing the upper surface of the first ring portion 81 to the lower surface of the pole piece 73 by welding or fusion.

  Thereby, the vibrating body 7 is supported by the elastic member 8 so that it can vibrate in the vertical direction. The inner peripheral surface of the magnet 71 is located radially outside the outer peripheral surface of the second yoke portion 6 and faces the outer peripheral surface in the radial direction.

  The damper portion 9 is a columnar member, and is a solid shape made of, for example, foamed polyurethane. The damper portion 9 is formed by, for example, removing it from a plate-like material by a press. The damper portion 9 is disposed between the weight 72 and the top plate portion 21 in the vertical direction. The damper portion 9 contacts both the upper surface of the weight 72 and the lower surface of the top plate portion 21 when the vibrating body 7 is not in operation. The non-operating state is a state in which no current flows through the coil 4 and no force is applied to the vibrating body 7 based on the magnetic field generated by the coil 4. That is, the vibrating body 7 is not operating.

  By supplying an electric current to the coil 4, a magnetic flux passing through a magnetic path composed of the coil 4, the first yoke portion 5, and the second yoke portion 6 is generated. Due to the interaction between the generated magnetic flux and the magnetic flux using the magnet 71 and the pole piece 73 as a magnetic path, the vibrating body 7 vibrates in the vertical direction. Accordingly, the vibration motor 15 is a longitudinal linear vibration type vibration motor.

  In particular, since the second yoke portion 6 is constituted by the bottom portion 61 and the wall portion 62 described above, the radial distance between the second yoke portion 6 and the magnet 71 is shortened, and the short portion is vertically moved. Since it can be made longer in the direction, the power of the vibration motor 15 can be increased. At this time, since it is not necessary to increase the thickness of the bottom portion 61, it is possible to suppress an increase in the vertical size of the vibration motor 15. Moreover, since it is not necessary to shorten the length of the coil 4 in the vertical direction, it is possible to suppress a decrease in the number of turns and a decrease in attractive force (reactance torque).

  Further, when the yoke is thick, the yoke cannot be manufactured by an inexpensive press process, and a cutting part is used, which is expensive. On the other hand, since it is not necessary to increase the thickness in the second yoke portion 6 of the present embodiment, it is possible to use an inexpensive press process.

  Here, the characteristic regarding the damper part 9 is further explained in full detail. The weight 72 has an outer peripheral part 721 located on the outer peripheral side and an inner peripheral part 722 located on the inner peripheral side. The inner peripheral part 722 is thinner in the vertical direction than the outer peripheral part 721. The outer peripheral surface of the magnet 71 is fixed to the inner wall surface of the inner peripheral portion 722. The upper surface of the inner peripheral part 722 is located below the upper surface of the outer peripheral part 721. Therefore, a step is formed on the upper surface of the weight 72. The upper surface of the magnet 71 is located between the upper surface of the inner peripheral part 722 and the upper surface of the outer peripheral part 721. That is, a gap is formed in the vertical direction between the upper surface of the outer peripheral portion 721 and the upper surface of the magnet 71. Note that the position of the upper surface of the magnet 71 may coincide with the position of the upper surface of the inner peripheral portion 722. In a non-operating state of the vibrating body 7, the lower surface of the cylindrical damper portion 9 is in contact with the upper surface of the outer peripheral portion 721, and the upper surface of the damper portion 9 is in contact with the lower surface of the top plate portion 21. In this state, a vertical gap is formed between the lower surface of the damper portion 9 and the magnet 71.

  The upper surface of the damper portion 9 is fixed to the lower surface of the top plate portion 21 by adhesion or an adhesive sheet. In this case, the lower surface of the damper portion 9 is not fixed to the upper surface of the outer peripheral portion 721. Note that the lower surface of the damper portion 9 may be fixed to the upper surface of the outer peripheral portion 721 by adhesion or an adhesive sheet. In that case, the upper surface of the damper portion 9 is not fixed to the lower surface of the top plate portion 21.

  That is, the vibration motor 15 according to the present embodiment includes a stationary part 10 having a casing C1 and a coil 4 and a magnet 71, and is supported by the stationary part 10 so as to be able to vibrate in the vertical direction. And an elastic member 8 disposed between the casing C1 and the lower surface of the vibrating body 7, and a solid damper portion 9 disposed on the upper side with respect to the vibrating body 7. The housing C <b> 1 has a top plate portion 21 located on the upper side of the damper portion 9. The damper portion 9 is fixed to one of the upper surface of the vibrating body 7 and the lower surface of the top plate portion 21. The damper portion 9 contacts both the vibrating body 7 and the top plate portion 21 when the vibrating body 7 is not in operation.

  According to such a configuration, since the damper part 9 is solid, it is not difficult to apply and hold it at a desired position like a magnetic fluid, and the damper part 9 can be easily assembled. Further, since the damper unit 9 is in contact with both the vibrating unit 7 and the top plate unit 21 when the vibrating unit 7 is not in operation, the vibrating unit 7 is not affected even when an impact is applied to the vibration motor 15 such as when dropped. It is difficult to move, and the vibrating body 7 can be prevented from coming into contact with the top plate 21 or the like. Thereby, the durability of the vibration motor 7 can be improved. That is, the vibration motor 15 with improved assemblability and durability can be realized.

  Moreover, the damper part 9 is comprised only from foaming polyurethane, for example. By using foamed polyurethane as the material, the density of the damper portion 9 is about 104 kg / m3, which is relatively low. Therefore, when the vibration motor 15 is dropped, the vibration body 7 is displaced by the collapse of the damper portion 9, and the density of the foamed polyurethane is increased when the polyurethane foam is compressed. The foamed polyurethane is crushed and the resistance gradually increases, so the impact is reduced. Note that the damper portion 9 is not limited to the above configuration, and for example, a part may be made of polyurethane foam and the other part may be made of rubber. That is, the damper part 9 should just be comprised with a foaming polyurethane as a material at least.

  The vibrating body 7 has a weight 72 disposed outside the magnet 71. The damper portion 9 contacts both the upper surface of the weight 72 and the lower surface of the top plate portion 21 in the non-operating state, and a gap is provided between the lower surface of the damper portion 9 and the upper surface of the magnet 71 in the non-operating state. The damper portion 9 is fixed to the lower surface of the top plate portion 21. In order to prevent the damper portion 9 from vibrating due to the gap between the lower surface of the damper portion 9 and the upper surface of the magnet 71, it is desirable that the damper portion 9 is fixed to the top plate portion 21 side instead of the weight 72.

  Further, the damper portion 9 having a cylindrical shape is circular in a plan view in the vertical direction. The shape of the top plate portion 21 in a plan view in the vertical direction is also circular. That is, the shape of the damper portion 9 in the plan view in the vertical direction substantially matches the shape of the top plate portion 21 in the plan view in the vertical direction. Thereby, shaping | molding of the damper part 9 can be simplified.

  Further, the circular outer edge position of the damper portion 9 is radially inward from the circular outer edge position of the lower surface of the top plate portion 21. That is, the outer edge of the damper portion 9 has a gap between the outer edge of the lower surface of the top plate portion 21. Thereby, the assembly | attachment property in the case of fixing to the top-plate part 21 of the damper part 9 can be improved.

  Moreover, the distance of the up-down direction between the upper surface of the outer peripheral part 721 and the lower surface of the top-plate part 21 in the state which does not arrange | position the damper part 9 shall be 0.8 mm, for example, and the damper arrange | positioned in the non-operating state of the vibrating body 7 The thickness in the vertical direction of the portion 9 is 1.1 mm, for example. That is, the thickness of the damper portion 9 in the non-operating state is larger than the gap between the weight 72 and the top plate portion 21 when the damper portion 9 is not disposed. Thereby, the elastic member 8 can be compressed by disposing the damper portion 9, and the vibrating body 7 can be stably brought into contact with the damper portion 9 by the elastic force.

<2. Second Embodiment>
Next, a second embodiment of the present invention will be described. FIG. 5 is a longitudinal sectional view of the vibration motor according to the second embodiment, corresponding to FIG. 3 according to the first embodiment. The structural difference of the vibration motor 151 according to the second embodiment shown in FIG. 5 from the first embodiment is the configuration of the damper portion 91.

  In the present embodiment, the damper portion 91 includes a first damper 911 and a second damper 912. The 1st damper 911 is the structure similar to the damper part 9 which concerns on 1st Embodiment. That is, the cylindrical first damper 911 contacts both the upper surface of the outer peripheral portion 721 and the lower surface of the top plate portion 21 included in the weight 72 when the vibrating body 7 is not in operation.

  The second damper 912 is made of, for example, the same solid material as the first damper 911, and is made of, for example, foamed polyurethane. The second damper 912 is configured in a disc shape, and the diameter thereof is smaller than the diameter of the first damper 911. In a non-operating state of the vibrating body 7, the second damper 912 contacts both the upper surface of the magnet 71 and the lower surface of the first damper 911.

  That is, in this embodiment, the vibrating body 7 has a weight 72 disposed outside the magnet 71, and the damper portion 91 is provided on both the upper surface of the weight 72 and the lower surface of the top plate portion 21 in the non-operating state. A first damper 911 that contacts, and a second damper 912 that contacts both the upper surface of the magnet 71 and the lower surface of the first damper 911 in the non-operating state.

  As a result, the same effects as those of the first embodiment can be obtained, and the second damper is used in addition to the first damper, so that the damping effect of the vibrating body can be improved.

  In addition, the lower surface of the first damper 911 is fixed to the upper surface of the outer peripheral portion 721 with an adhesive or an adhesive sheet, and the upper surface of the first damper 911 is not fixed to the lower surface of the top plate portion 21. The lower surface of the second damper 912 is fixed to the upper surface of the magnet 71 with an adhesive or an adhesive sheet. The upper surface of the second damper 912 may or may not be fixed to the lower surface of the first damper 911.

  That is, in the present embodiment, it is preferable that the first damper 911 is fixed to the upper surface of the weight 72 and the second damper 912 is fixed to the upper surface of the magnet 71. Thereby, the assembly | attachment property at the time of fixing both a 1st damper and a 2nd damper can be improved. In addition, it is possible to use other fixing methods. For example, the first damper 911 may be fixed to the top plate portion 21 and the second damper 912 may be fixed to the magnet 71.

<3. Third Embodiment>
Next, a third embodiment of the present invention will be described. FIG. 6 is a longitudinal sectional view of the vibration motor according to the third embodiment, corresponding to FIG. 3 according to the first embodiment. The structural difference of the vibration motor 152 according to the third embodiment shown in FIG. 6 from the first embodiment is the configuration of the damper portion.

  In the present embodiment, the third damper 92 is used as the damper portion. The third damper 92 has an annular cylindrical shape in a plan view in the vertical direction, and is made of, for example, polyurethane foam. In a non-operating state of the vibrating body 7, the lower surface of the third damper 92 is in contact with the upper surface of the outer peripheral portion 721, and the upper surface of the third damper 92 is in contact with the lower surface of the top plate portion 21. The third damper 92 overlaps only the weight 72 of the weight 72 and the magnet 71 in a plan view in the vertical direction. That is, the third damper 92 does not overlap with the magnet 71. The lower surface of the third damper 92 is fixed to the upper surface of the outer peripheral portion 721 by adhesion or an adhesive sheet. The upper surface of the third damper 92 is not fixed to the lower surface of the top plate portion 21.

  That is, in the present embodiment, the vibrating body 7 has an annular weight 72 in a plan view in the vertical direction surrounding the magnet 71, and the damper portion has at least a third damper 92 that is annular in a plan view in the vertical direction. The third damper 92 contacts both the upper surface of the weight 72 and the lower surface of the top plate portion 21 in the non-operating state, and the third damper 92 is only the weight 72 of the weight 72 and the magnet 71 in the plan view in the vertical direction. The third damper 92 is fixed to the upper surface of the weight 72.

  Thereby, while having the same effect as the first embodiment, the third damper does not vibrate due to the gap between the upper surface of the magnets, and thus the third damper can be fixed to the weight side. . Therefore, it is possible to improve the assembling property when fixing the third damper.

<4. Fourth Embodiment>
Next, a fourth embodiment of the present invention will be described. FIG. 7 is a longitudinal sectional view of the vibration motor according to the fourth embodiment, corresponding to FIG. 6 according to the third embodiment. The structural difference of the vibration motor 153 according to the fourth embodiment shown in FIG. 7 from the third embodiment is the configuration of the damper portion.

  In the present embodiment, the damper portion includes a fourth damper 93 in addition to the third damper 92 described in the third embodiment. The fourth damper portion 93 has a cylindrical shape and is made of, for example, the same solid material as the third damper 92, and is made of, for example, foamed polyurethane. The third damper 92 has a through hole 92A extending in the vertical direction. The fourth damper 93 is disposed inside the through hole 92A. In a non-operating state of the vibrating body 7, the lower surface of the fourth damper 93 is in contact with the upper surface of the magnet 71, and the upper surface of the fourth damper 93 is in contact with the lower surface of the top plate portion 21.

  In other words, in the present embodiment, the damper portion further includes a fourth damper 93 disposed inside the through hole 92A of the third damper 92, and the fourth damper 93 is positioned on the top surface of the magnet 71 and the ceiling in the non-operating state. It contacts both of the lower surfaces of the plate part 21. Thereby, in addition to the 3rd damper 92, the 4th damper 93 is used, Therefore The damping effect of a vibrating body can be improved.

  In the present embodiment, the lower surface of the fourth damper 93 is fixed to the upper surface of the magnet 71 by adhesion or an adhesive sheet, and the upper surface of the fourth damper 93 is not fixed to the lower surface of the top plate portion 21. In other words, the fourth damper 93 is preferably fixed to the upper surface of the magnet 71. Thereby, the assembly | attachment property at the time of fixing the 4th damper 93 can be improved.

<5. About tactile devices>
As shown in FIG. 8, the vibration motor 15 is mounted on the haptic device 200. In addition to the vibration motor 15, the above-described vibration motors 151 to 153 may be mounted on the tactile device 200. The tactile device 200 gives a tactile stimulus to a person who operates the tactile device 200 by the vibration of the vibration motor 15. As the haptic device 200, for example, a mobile phone including a smartphone, a tablet, a game device, and a wearable terminal can be employed.

  The tactile device 200 according to the present embodiment includes the vibration motor 15, a substrate 110 on which the vibration motor 15 is mounted, and a control unit 120. The vibration motor 15 is electrically and mechanically connected to the substrate 110. The control unit 120 outputs a drive current to the vibration motor 15 via the substrate 110. The vibration motor 15 vibrates according to a drive signal from the control unit 120. The tactile device 200 vibrates so as to give a tactile stimulus to a person who operates the tactile device 200 by the vibration of the vibration motor 15.

<6. Other>
As mentioned above, although embodiment of this invention was described, if it is in the range of the meaning of this invention, embodiment can be variously changed.

  For example, although each damper part in the said 1st-4th embodiment was the structure arrange | positioned over the perimeter of the circumferential direction, it comprised from the several damper arrange | positioned at intervals in the circumferential direction. Also good. In this case, the plurality of dampers are preferably equally spaced in the circumferential direction.

  The present invention can be used for a vibration motor provided in, for example, a smartphone, a wearable device, and the like.

DESCRIPTION OF SYMBOLS 1 ... Base plate, 11 ... 1st base part, 111 ... Fixed part, 12 ... 2nd base part, 2 ... Case, 21 ... Top plate part, 22 ... Opening, 3... FPC (flexible printed circuit board), 31... First substrate, 32... Second substrate, 4. .... Base part, 52 ... Projection part, 6 ... Second yoke part, 61 ... Bottom part, 62 ... Wall part, 7 ... Vibrating body, 71 ... Magnet, 72 ... Weight, 721 ... outer peripheral part, 722 ... inner peripheral part, 73 ... pole piece, 8 ... elastic member, 81 ... first ring part, 82 ... second ring part, 83 ... Connection parts
9, 91 ... damper part, 911 ... first damper, 912 ... second damper, 92 ... third damper, 92A ... through-hole, 93 ... fourth damper, 10 · ..Standing part, 15, 151, 152, 153 ... vibration motor, C1 ... casing, J ... central axis

Claims (12)

A stationary part having a housing and a coil;
A vibrating body including a magnet and supported to be able to vibrate in a vertical direction with respect to the stationary portion;
An elastic member disposed between the casing and the lower surface of the vibrating body;
A solid damper portion disposed on the upper side with respect to the vibrating body;
With
The housing has a top plate portion located on the upper side of the damper portion,
The damper portion is fixed to one of the upper surface of the vibrating body and the lower surface of the top plate portion,
The damper part is in contact with both the vibrator and the top plate part when the vibrator is not in operation.
Vibration motor.   The vibration motor according to claim 1, wherein the damper portion is made of at least foamed polyurethane. The vibrator has a weight arranged outside the magnet,
The damper portion contacts both the upper surface of the weight and the lower surface of the top plate portion in the non-operating state,
A gap is provided between the lower surface of the damper portion and the upper surface of the magnet in the non-operating state,
The vibration motor according to claim 1, wherein the damper portion is fixed to a lower surface of the top plate portion.   The vibration motor according to claim 3, wherein a shape of the damper portion in a plan view in the vertical direction substantially matches a shape of the top plate portion in a plan view in the vertical direction.   5. The vibration motor according to claim 3, wherein an outer edge of the damper portion has a gap with an outer edge of a lower surface of the top plate portion.   The thickness of the said damper part in the said non-operating state is larger than the clearance gap between the said weight in the state which does not arrange | position the said damper part, and the said top-plate part, In any one of Claims 3-5. The vibration motor described. The vibrator has a weight arranged outside the magnet,
The damper part is
A first damper that contacts both the upper surface of the weight and the lower surface of the top plate in the non-operating state;
A second damper that contacts both the upper surface of the magnet and the lower surface of the first damper in the non-operating state;
The vibration motor according to claim 1, comprising: The first damper is fixed to an upper surface of the weight;
The vibration motor according to claim 7, wherein the second damper is fixed to an upper surface of the magnet. The vibrating body has an annular weight in a plan view in the vertical direction surrounding the magnet,
The damper portion has at least a third damper that is annular in a plan view in the vertical direction,
The third damper is in contact with both the upper surface of the weight and the lower surface of the top plate in the non-operating state,
The third damper overlaps only the weight among the weight and the magnet in a plan view in the vertical direction,
The vibration motor according to claim 1, wherein the third damper is fixed to an upper surface of the weight. The damper portion further includes a fourth damper disposed inside the through hole of the third damper,
The vibration motor according to claim 9, wherein the fourth damper is in contact with both the upper surface of the magnet and the lower surface of the top plate portion in the non-operating state.   The vibration motor according to claim 10, wherein the fourth damper is fixed to an upper surface of the magnet.   A tactile device having the vibration motor according to any one of claims 1 to 11.

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