JP6670723B2 - Vibration motor - Google Patents

Description

  The present invention relates to a vibration motor.

  Conventionally, various devices such as smartphones are provided with a vibration motor. Vibration motors include a type that performs linear vibration in the horizontal direction and a type that performs linear vibration in the vertical direction. A human being, as a user, tends to feel vertical vibrations more 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 fixed part, a magnetic field part, a substrate, a vibration part, and an elastic member. The fixing part has a case whose lower part is open, and a bracket that seals the internal space of the case. The magnetic field portion has a magnet fixed on the bracket and a yoke plate fixed on the magnet. The vibrating section has a coil and a mass body. The substrate is fixed to the lower surface of the coil. The elastic member is disposed between the case and the vibration part. The coil has an inner diameter that is greater than the outer diameter of the opposing magnet, and a portion of the magnet can be inserted into the space formed by the coil.

  When the coil is energized through the substrate, the vibrating portion vibrates in the vertical direction due to the interaction between the magnetic field generated in the coil and the magnetic field formed by the magnet.

JP 2013-85438 A

  Here, in a smartphone, a wearable device, or the like on which a vibration motor is mounted, a vibration motor capable of outputting a large vibration is required. However, the vibration motor of Patent Literature 1 does not aim to solve the above problem.

  In view of the above situation, an object of the present invention is to provide a vertical linear vibration type vibration motor capable of outputting a large vibration.

An exemplary vibration motor of the present invention comprises:
A stationary part having a base plate, a substrate, a coil, and a case,
A magnet, a back yoke, and a weight, including a vibrator that is supported to be able to vibrate vertically with respect to the stationary part,
And an elastic member,
The substrate is arranged on the base plate,
The coil is disposed on the substrate,
The magnet is arranged so as to be accommodated by vibration on the inner peripheral side of the annular coil,
The back yoke is disposed on the magnet,
The weight is disposed on the back yoke,
The case houses the coil, the magnet, the back yoke, and the weight,
The elastic member is disposed between the case and the weight,
The substrate is configured to have a penetrating region penetrating in the vertical direction at least on the inner peripheral side of the coil.

  According to the exemplary vibration motor of the present invention, it is possible to provide a vertical linear vibration type vibration motor capable of outputting a large vibration.

FIG. 1 is an overall perspective view of a vibration motor 15 according to an embodiment of the present invention as viewed from above. FIG. 2 is an overall perspective view of the vibration motor according to the embodiment of the present invention as viewed from below. FIG. 3 is a perspective view showing a state where a case is removed from the vibration motor shown in FIG. FIG. 4 is a side sectional view of the vibration motor according to one embodiment of the present invention. FIG. 5 is a top plan view of the vibration motor according to the embodiment of the present invention with the case 4 removed. FIG. 6 is a perspective view showing a configuration including a modification of the elastic member. FIG. 7 is a schematic diagram for explaining an appropriate arrangement position of the damper member. FIG. 8 is an overall perspective view of the back yoke. FIG. 9 is a partially enlarged perspective view of the vibration motor according to the embodiment of the present invention with the case removed. FIG. 10 is a perspective view showing a configuration in which a substrate and a coil are arranged on a base plate. FIG. 11 is a perspective view showing a configuration in which a substrate is arranged on a base plate. FIG. 12 is a perspective view for explaining coil fixing by a jig.

  Hereinafter, exemplary embodiments of the present invention will be described with reference to the drawings. In addition, in the following drawings, the vibration direction of the vibrating body is represented by the X direction with the vertical direction. The first direction orthogonal to the vertical direction is represented by the Y direction. In addition, a Z direction is represented as a second direction that is a direction perpendicular to the vertical direction and the first direction. However, the definition of the direction does not indicate the positional relationship and the direction when incorporated in an actual device.

<1. Overall configuration of vibration motor>
First, an overall configuration of a vibration motor according to an embodiment of the present invention will be described with reference to FIGS. FIG. 1 is an overall perspective view of a vibration motor 15 according to an embodiment of the present invention as viewed from above. FIG. 2 is an overall perspective view of the vibration motor 15 viewed from below. FIG. 3 is a perspective view showing a state where the case 4 is removed from the vibration motor 15 shown in FIG. FIG. 4 is a side sectional view of the vibration motor 15.

  The vibration motor 15 according to the present embodiment is roughly divided into a stationary portion 5, a vibrating body 10, and an elastic member 11.

  The stationary part 5 has a base plate 1, a substrate 2, a coil 3, and a case 4. The base plate 1 is, for example, a metal plate member. The base plate 1 is formed in a rectangular shape having a long side in the first direction and a short side in the second direction when viewed from above.

  The substrate 2 is disposed on the base plate 1 and is configured by an FPC (Flexible Printed Circuit). Note that the substrate 2 may be formed of a rigid substrate. The substrate 2 has a first substrate unit 21, a second substrate unit 22, and a connection unit 23. The first substrate part 21, the connection part 23, and the second substrate part 22 are arranged in order in the first direction. The width of the first substrate 21 in the first direction is shorter than the width of the second substrate 22 in the first direction. The widths of the first substrate portion 21 and the second substrate portion 22 in the second direction are the same, and are longer than the width of the connection portion 23 in the second direction.

  The two first terminal portions 21A are formed side by side in the second direction on the first substrate portion 21 and are exposed on the upper surface side. The two second terminal portions 23A are formed side by side in the second direction on the connection portion 23 and are exposed on the upper surface side. The first terminal portion 21A and the second terminal portion 23A adjacent to each other in the first direction are connected to each other by the wiring of the substrate 2 and are conducted.

  The coil 3 is disposed on the second substrate portion 22 of the substrate 2. The coil 3 is formed in an annular shape having a long side in the first direction and a short side in the second direction when viewed from above. A lead wire drawn from the coil 3 is connected to the second terminal portion 23A. This allows a current to flow through the coil 3 by externally applying a voltage to the first terminal portion 21A.

  The case 4 is a cover member having a rectangular parallelepiped shape having a long side in the first direction and a short side in the second direction, and a lower surface opened in a top view. The coil 3, the vibrating body 10, and the elastic member 11 are housed in the internal space of the case 4.

  The vibrating body 10 has a magnet 6, a back yoke 7, a weight 8, and a pole piece 9. The magnet 6 is a rectangular parallelepiped member having a long side in the first direction and a short side in the second direction when viewed from above.

  The back yoke 7 is disposed on the magnet 6, and is made of a magnetic material. The back yoke 7 has a top surface 71, two long-side protrusions 72, and two short-side protrusions 73. The top surface portion 71 has a rectangular shape having a long side in the first direction and a short side in the second direction when viewed from above. The long side protruding portion 72 protrudes downward from a long side portion of the top surface portion 72 facing the second direction. The short side protruding portion 73 protrudes downward from the short side portion of the top surface portion 72 facing the first direction.

  The weight 8 is disposed on the back yoke 7 and is formed of, for example, a tungsten alloy. The weight 8 is a rectangular parallelepiped member having a long side in the first direction and a short side in the second direction when viewed from above.

  The pole piece 9 is a plate-shaped member arranged on the lower surface of the magnet 6 and made of a magnetic material. The pole piece 9 has a rectangular shape having a long side in the first direction and a short side in the second direction when viewed from above. A magnetic path is formed by the magnet 6, the back yoke 7, and the pole piece 9.

  The elastic member 11 has one end fixed to the lower surface of the top surface portion 41 of the case 4 and the other end fixed to the upper surface 81 of the weight 8. That is, the elastic member 11 is disposed between the case 4 and the weight 8. Thereby, the vibrating body 10 is supported so as to be able to vibrate up and down with respect to the stationary part 5.

  The magnet 6 and the pole piece 9 are housed in the space on the inner peripheral side of the coil 7 depending on the position at the time of vibration. That is, the magnet 6 is arranged on the inner peripheral side of the annular coil 7 so as to be accommodated by vibration.

  By applying a voltage to the first terminal portion 21A of the substrate 2 from the outside, a current flows through the coil 3 and a magnetic field generated in the coil 3 and a magnetic field formed by the magnet 6, the back yoke 7, and the pole piece 9 The vibrating body 10 vibrates in the vertical direction by the interaction of Therefore, the vibration motor 15 is of a vertical linear vibration type.

  As described above, the base plate 1, the case 4, the magnet 6, the back yoke 7, and the weight 8 each have a rectangular shape including a long side in the first direction and a short side in the second direction when viewed from above. Therefore, it is possible to arrange the vibration motor 15 of the vertical linear vibration type in a rectangular dead space such as the side of a battery in a device such as a smartphone or a wearable device.

<2. About the structure of the elastic member>
Next, a more specific configuration of the elastic member 11 will be described with reference to FIG. FIG. 5 is a plan view of the vibration motor 15 with the case 4 removed, as viewed from above.

  As shown in FIG. 5, the elastic member 11 includes a first extending portion 11A, a second extending portion 11B, a first connecting portion 11C, a second connecting portion 11D, a third extending portion 11E, and a fourth extending portion. It has a part 11F, a third connection part 11G, a fourth connection part 11H, and a fifth connection part 11I, and these parts are formed as the same member.

  The first extension 11A and the second extension 11B extend in the first direction and are adjacent to each other in the second direction when viewed from above. The first connection portion 11C connects one end of the first extension 11A and one end of the second extension 11B. The second connection portion 11D connects the other end of the first extension 11A to the other end of the second extension 11B.

  The third extension 11E extends in the first direction, and faces the first extension 11A in the second direction. The fourth extension 11F extends in the first direction, and is adjacent to the third extension 11E in the second direction when viewed from above. The third connection portion 11G connects one end of the third extension 11E and one end of the fourth extension 11F. The fourth connection portion 11H connects the other end of the third extension 11E to the other end of the fourth extension 11F.

  The fifth connecting portion 11I connects the central portion of the first extended portion 11A and the central portion of the third extended portion 11E in the second direction.

  With such a configuration, only one elastic member 11 is required, and the number of components can be reduced.

  Furthermore, if the configuration of the elastic member 11 is described with reference to FIG. 3 as well, the first extending portion 11A inclines upward from the center to both ends. The second extending portion 11B inclines upward from both ends to the center. The second extending portion 11B has a welded portion 11J at the top of the slope. In addition, the third extending portion 11E is inclined upward from the center toward both ends. The fourth extending portion 11F inclines upward from both ends to the center. The fourth extension 11F has a weld 11K at the top of the slope.

  With such a configuration, the fifth connection portion 11I is fixed to the upper surface 81 of the weight 8 by welding, and the welded portions 11J and 11K located above the fifth connection portion 11I are welded to the lower surface of the top surface portion 41 of the case 4. And the vibrating body 10 can be supported so as to be able to vibrate with respect to the case 4.

  As a modification of the elastic member, an elastic member 11 'having a configuration as shown in FIG. 6 may be used. In the elastic member 11 ', the first extending portion 11'A inclines downward from the center to both ends. The second extending portion 11'B is inclined downward from both ends toward the center. The second extending portion 11'B has a welded portion 11'J at the lowest point of the slope. Further, the third extending portion 11'E is inclined downward from the central portion toward both ends. The fourth extending portion 11'F is inclined downward from both ends to the center. The fourth extending portion 11'F has a welded portion 11'K at the lowest point of the inclination.

  With such a configuration, the welded portions 11′J and 11′K are fixed to the upper surface 81 of the weight 8 by welding, and the fifth connection portion 11′I located above the welded portions 11′J and 11′K is connected. The vibrating body 10 can be supported so as to be able to vibrate with respect to the case 4 by being fixed to the lower surface of the top surface portion 41 of the case 4 by welding.

  In the elastic member 11 (FIG. 5), the widths of the first connection portion 11C, the second connection portion 11D, the third connection portion 11G, and the fourth connection portion 11H are the first extension portion 11A and the second extension portion 11B. , The third extending portion 11E and the fourth extending portion 11F. Thereby, the stress applied to the elastic member 11 when the vibration body 10 vibrates can be dispersed. This is the same for the elastic member 11 'as a modification.

<3. About the arrangement of the damper member>
The vibration motor 15 according to the present embodiment further includes damper members 12A to 12D on the top surface portion 81 of the weight 8 as shown in FIGS. In a top view, the damper members 12A and 12B, that is, at least one damper member are arranged in a region surrounded by the first extension portion 11A, the second extension portion 11B, the first connection portion 11C, and the second connection portion 11D. . The damper members 12A and 12B are arranged at positions separated from each other in the first direction from the center of the region.

  Further, in a top view, the damper members 12C and 12D, that is, at least one damper member are arranged in a region surrounded by the third extension portion 11E, the fourth extension portion 11F, the third connection portion 11G, and the fourth connection portion 11H. Is done. The damper members 12C and 12D are arranged at positions separated from each other in the first direction from the center of the region.

  By providing such damper members 12A to 12D, when the vibration motor 15 is dropped by mistake, the weight 8 moves excessively upward, and the elastic member 11 (the fifth connection portion 11I and the like) is moved. Contact with the lower surface of the top surface portion 41 of the case 4 and generation of noise can be suppressed.

  Further, since the damper members 12A to 12D can be arranged inside the region where the elastic member 11 is arranged, the arrangement space can be omitted.

  In addition, as shown in FIG. 5, for example, the damper members may be disposed at a position P1 sandwiched in the second direction by the damper members 12A and 12C and a place P2 sandwiched in the second direction by the damper members 12B and 12D. It is possible. That is, at least one damper member may be arranged in a region sandwiched between the first extending portion 11A and the third extending portion 11E. In this case, it may be arranged together with the damper members 12A to 12D, or may be arranged only at the points P1 and P2. With such a configuration, the same effects as those described above can be enjoyed.

  It can be said that the configuration relating to the damper member described above is a configuration in which at least one damper member is disposed within an area occupied by the elastic member 11 in a top view. Thereby, the arrangement space of the damper member can be saved.

  Next, an appropriate arrangement position of the damper member will be described with reference to FIG. FIG. 7 is a schematic view of the weight 8, the elastic member 11, and the damper member 12 as viewed from the side. FIG. 7 shows a state in which each of these components (that is, the vibrating body 10) is inclined clockwise from the first direction by an angle θ. Show.

The vertical height from the line L1 extending in the first direction through the intersection S where the side sandwiched between the upper side and the lower side of the damper member 12 intersects the upper side of the elastic member to one end of the upper side of the elastic member 11 is represented by W Then, W is represented by the following equation (1).
W = Xsin θ (1)

  Where X is the distance from one end of the upper side of the elastic member 11 to the intersection S.

Further, assuming that the vertical height from the line L1 to one end of the upper side of the elastic member 12 is Z, Z is represented by the following equation (2).
Z = (AB) cos θ (2)

  Here, A: thickness of the damper member 12, B: thickness of the elastic member 11.

Under the condition of W <Z, the case 4 (not shown in FIG. 7) does not contact the elastic member 11. Therefore, the above condition is
Xsin θ <(AB) cos θ, which can be rewritten as the following equation (3).

  X <(AB) cos θ / sin θ (3)

  Therefore, if the damper member 12 is arranged at a position represented by X that satisfies the condition of the above equation (3), the case 4 and the elastic member 11 do not come into contact with each other. For example, when A: 0.25 mm, B: 0.12 mm, and θ: 3 °, X <2.4 mm.

<4. Configuration of back yoke>
Next, the configuration of the back yoke 7 will be described with reference to FIGS. FIG. 8 is an overall perspective view of the back yoke 7. FIG. 9 is a partially enlarged perspective view of the vibration motor 15 with the case 4 removed. FIG. 9 shows a configuration around the first substrate unit 21 of the substrate 2.

  As shown in FIG. 8, the back yoke 7 has a rectangular top surface portion 71, two long side protrusion portions 72, and two short side protrusion portions 73, and these portions are formed as the same member. Is done. The long side protrusion 72 protrudes downward from each long side 711 of the top surface 71. The short side protruding portions 73 protrude downward from each short side portion 712 of the top surface portion 71. The top surface portion 71 has notches C1 at four corners. Accordingly, when the back yoke 7 is molded from a plate material, the long side projection 72 and the short side projection 73 do not come into contact with each other when the long side projection 72 and the short side projection 73 are bent from the top surface 71. .

  As shown in FIG. 9, a lead wire 31 drawn in the first direction from the short side of the coil 3 has an end portion connected to each of the second terminals provided on the connection portion 23 of the substrate portion 2 by the solder fixing portion R. It is connected and fixed to the portion 23A. The end of the lead wire 31 to be fixed is disposed below the short side projection 73 of the back yoke 7. That is, a part of the lead wire 31 is disposed below the short side projection 73.

  Here, the short side protrusion 73 has a smaller protrusion amount than the long side protrusion 72. Therefore, even if the lead wire 31 is pulled out from the short side of the coil 3, disconnection of the lead wire 31 can be suppressed, and space can be saved.

  Further, the solder fixing portion R is disposed below the short side protruding portion 73. That is, below the short-side protruding portion 73, the solder fixing portion R where a part of the lead wire 31 is fixed to the substrate 2 is arranged. Thus, it is possible to prevent the back yoke 7 from contacting the solder fixing portion R and breaking the solder fixing portion R during normal vibration of the vibrating body 10.

  Further, in order to suppress the disconnection of the lead wire 31, an adhesive Q is provided so as to cover the lead wire 31 and the solder fixing portion R. The adhesive Q contacts the short side of the coil 3. The adhesive Q is disposed below the short side protrusion 73. Therefore, it is possible to prevent the back yoke 7 from coming into contact with the adhesive Q during normal vibration of the vibrating body 10 and generating noise.

  The top surface 71 of the back yoke 7 is provided with a through hole 71A penetrating vertically. That is, the through-hole 71A is provided on the surface of the back yoke 7 to which the magnet 6 is fixed.

  Thus, for example, when the magnet 6 is fixed to the top surface 71 by magnetic force and the adhesive is poured into the through hole 71A to fix the magnet 6 to the top surface 71, the adhesive protrudes outside the magnet 6. Can be suppressed.

  Further, for example, in a state where the adhesive is applied in advance to the area around the through hole 71A or to the surface of the magnet 6 corresponding to the area around the through hole 71A, the magnet 6 is brought into contact with the top surface 71 so that the magnet 6 is attached to the top surface 71. Even in the case of the fixing method, since a part of the adhesive flows into the through hole 71A, it is possible to suppress the adhesive from protruding outside the magnet 6. That is, the adhesive can be released to the through-hole 71A.

  Also, for example, similarly to the magnet 6, the weight 8 and the top surface 71 are brought into contact with each other in a state in which the adhesive is applied in advance to the peripheral area of the through hole 71A or the surface of the weight 8 corresponding to the peripheral area. Even in the case of fixing the top surface 8 to the top surface portion 71, it is possible to prevent a part of the adhesive from leaking into the through hole 71A and prevent the adhesive from protruding outside the weight 8.

<5. About the configuration of the board>
Next, a more specific configuration of the substrate 2 will be described with reference to FIGS. FIG. 10 is a perspective view showing a configuration in which the substrate 2 and the coil 3 are arranged on the base plate 1 in the vibration motor 15. FIG. 11 is a perspective view showing a configuration in which the substrate 2 is arranged on the base plate 1 in the vibration motor 15. That is, FIG. 11 is a diagram in which the coil 3 is omitted from the state of FIG.

  The coil 3 has an internal space 221 on the inner peripheral side. In the second substrate portion 22 of the substrate 2, a penetrating region 221 penetrating in the up-down direction is formed. In a top view, the edge of the internal space 221 overlaps with a straight line portion at the edge of the through region 221. That is, the substrate 2 has the penetrating region 221 penetrating in the vertical direction at least on the inner peripheral side of the coil 3. Thereby, the stroke of the vibrating body 10 can be increased. The edge of the through region 221 may be arranged on the inner peripheral side or the outer peripheral side of the edge of the internal space 221.

  Further, the edge of the penetrating region 221 includes a long side edge 221A facing in the first direction and a short side edge 221B facing in the second direction. Each of the long side edge portions 221A is formed with three cutout portions C2 recessed toward the outer peripheral side. Further, at the four corners of the edge of the penetrating region 221, that is, at a portion where the long side edge 221 </ b> A and the short side edge 221 </ b> B are close to each other, a notch C <b> 3 recessed to the outer peripheral side is formed. That is, a plurality of notches are provided at the edge of the through region 221.

  When fixing the coil 3 to the base plate 1, an adhesive is applied to each of the notches C2 and C3. Then, by pressing the coil 3 against the second substrate portion 22 from above the notches C2 and C3, the coil 3 is fixed to the base plate 1 while sandwiching the second substrate portion 22 between the coil 3 and the base plate 1. Can be. Therefore, it is possible to prevent the substrate 2 from being peeled off from the base plate 1.

  Further, in the second substrate portion 22, a closed circuit pattern 24 is provided around the through region 221. The closed circuit pattern 24 is a closed wiring pattern (for example, a copper foil pattern), and no current flows. In addition, the closed circuit pattern 24 is formed inside the substrate 2 in FIG. 11, but may be exposed on the upper surface of the substrate 2. Although the closed circuit pattern 24 in FIG. 11 has a shape in which both ends are not connected, it may be a pattern in which both ends are connected, that is, an annular pattern. Alternatively, the closed circuit pattern 24 may be a linear pattern divided corresponding to each side of the edge of the through region 221.

  Thus, the strength of the second substrate portion 22, which is reduced in strength by providing the through region 221, can be reinforced by the closed circuit pattern 24.

<6. About the configuration of the base plate>
Next, a more specific configuration of the base plate 1 will be described. As shown in FIG. 11, two holes 1 </ b> A and 1 </ b> B penetrating in a vertical direction having different shapes are provided in a region inside the through region 221 in the base plate 1. The holes 1A and 1B are arranged in the first direction.

  The holes 1A and 1B are used when fixing the coil 3 to the substrate 2. As shown in FIG. 12, when fixing the coil 3 to the substrate 2, a jig (bobbin) 100 is used. The jig 100 has a base 101 and bosses 102 and 103 projecting downward from the base 101. The boss 102 has a sectional shape corresponding to the hole 1A, and the boss 103 has a sectional shape corresponding to the hole 1B.

  The boss 102 of the jig 100 with the coil 3 wound around the base 101 is passed through the hole 1A, and the boss 103 is passed through the hole 1B. At this time, since the adhesive is applied to the notches C2 and C3 of the substrate 2 as described above, the coil 3 is fixed to the base plate 1. Thereafter, the jig 100 is removed from the coil 3.

  Since the holes 1A and 1B have different shapes from each other, the jig 100 can be easily oriented in the fixing operation of the coil 3.

  Further, as shown in FIG. 11 and the like, a notch recess 1C is provided on each of the sides of the base plate 1 facing the second direction. In the example of FIG. 11, three notched concave portions 1C are provided side by side in the first direction.

  On the other hand, as shown in FIGS. 1 and 2, the case 4 has a side surface 42 facing the second direction. Each side surface portion 42 has a convex portion 4A projecting downward. Three convex portions 4A are provided in the first direction for each side surface portion 42.

  And each convex part 4A is fitted in each corresponding notch concave part 1C. Thereby, when fixing the case 4 to the base plate 1, the positioning of the case 4 becomes easy.

<7. Others>
As described above, the embodiments of the present invention have been described, but the embodiments can be variously modified within the scope of the gist of the present invention.

  For example, the elastic member is not limited to the elastic member 11 described above, and may be a plurality of leaf springs or wound springs arranged side by side on the weight 8.

  INDUSTRIAL APPLICATION This invention can be utilized for the vibration motor provided in a smart phone, a wearable apparatus, etc., for example.

  DESCRIPTION OF SYMBOLS 1 ... Base plate, 2 ... Board, 3 ... Coil, 4 ... Case, 5 ... Stationary part, 6 ... Magnet, 7 ... Back yoke, 8 ... Weight, 9 ... Pole piece, 10 ... Vibrator, 11 ... Elastic member, 12A-12D ... Damper member, 15 ... Vibration motor, 100 ... Jig (bobbin)

Claims (16)

A stationary part having a base plate, a substrate, a coil, and a case,
A magnet, a back yoke, and a weight, including a vibrator that is supported to be able to vibrate vertically with respect to the stationary part,
And an elastic member,
The substrate is arranged on the base plate,
The coil is disposed on the substrate,
The magnet is arranged so as to be accommodated by vibration on the inner peripheral side of the annular coil,
The back yoke is disposed on the magnet,
The weight is disposed on the back yoke,
The case houses the coil, the magnet, the back yoke, and the weight,
The elastic member is disposed between the case and the weight,
The vibration motor, wherein the substrate has a penetrating region penetrating in a vertical direction at least on an inner peripheral side of the coil.   The vibration motor according to claim 1, wherein a plurality of notches are provided at an edge of the through region.   The vibration motor according to claim 1, wherein a closed circuit pattern is provided around the through region.   The vibration motor according to any one of claims 1 to 3, wherein two holes having different shapes and penetrating in a vertical direction are provided in a region in the through region of the base plate. The elastic member,
A first extending portion extending in a first direction orthogonal to the vertical direction;
A second extending portion extending in the first direction;
A first connecting portion that connects one end of the first extending portion and one end of the second extending portion,
A second connecting portion connecting the other end of the first extending portion and the other end of the second extending portion,
A third extending portion extending in a first direction and facing the first extending portion in a second direction;
A fourth extending portion extending in the first direction;
A third connecting portion connecting one end of the third extending portion and one end of the fourth extending portion,
A fourth connecting portion connecting the other end of the third extending portion and the other end of the fourth extending portion,
A fifth connecting portion that connects a central portion of the first extended portion and a central portion of the third extended portion in a vertical direction and a second direction orthogonal to the first direction;
The vibration motor according to any one of claims 1 to 4, comprising: The first extending portion is inclined upward as going from the center to both ends,
The second extending portion is inclined upward from both ends toward the center,
The third extending portion is inclined upward from the center toward both ends,
The vibration motor according to claim 5, wherein the fourth extension portion is inclined upward from both ends to the center. The first extending portion is inclined downward as going from the center to both ends,
The second extending portion is inclined downward from both ends toward the center,
The third extending portion is inclined downward from the center toward both ends,
The vibration motor according to claim 5, wherein the fourth extension portion is inclined downward from both ends to the center.   The vibration motor according to any one of claims 5 to 7, wherein a width of the first to fourth connection portions is wider than a width of the first to fourth extension portions. At least one damper member is disposed in a region surrounded by the first extension portion, the second extension portion, the first connection portion, and the second connection portion,
The at least one damper member is disposed in a region surrounded by the third extension, the fourth extension, the third connection, and the fourth connection. A vibration motor according to the item.   The vibration motor according to any one of claims 5 to 9, wherein at least one damper member is disposed in a region sandwiched between the first extension portion and the third extension portion.   The vibration motor according to any one of claims 1 to 10, wherein at least one damper member is disposed within an area occupied by the elastic member when viewed from above. The back yoke has a rectangular top surface, a long side protrusion that protrudes downward from a long side of the top surface, and a short side protrusion that protrudes downward from a short side of the top surface. Has,
The short side protrusion has a smaller protrusion amount than the long side protrusion,
The vibration motor according to any one of claims 1 to 11, wherein a part of a lead wire drawn from a short side of the coil is disposed below the short side protrusion.   The vibration motor according to claim 12, wherein an adhesive covering a part of the lead wire is disposed below the short side protrusion.   14. The vibration motor according to claim 12, wherein a solder fixing part for fixing a part of the lead wire to the substrate is disposed below the short side protruding part.   The vibration motor according to any one of claims 1 to 14, wherein a through-hole penetrating vertically is provided on a surface of the back yoke to which the magnet is fixed. A notch recess is provided on each of the sides facing the one direction perpendicular to the vertical direction of the base plate,
The case has side portions facing in one direction,
Each of the side portions has a convex portion protruding downward,
The vibration motor according to any one of claims 1 to 15, wherein the protrusion is fitted into the notch recess.

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