Vibration generating device

Abstract

To provide a vibration generating device that can be easily miniaturized.SOLUTION: A vibration generating device 101 includes: a vibrating body VB which is housed within a housing HS; an elastic support member ES which supports the vibrating body VB in a manner of being able to vibrate; a bracket 11 which has a main plate part 11B and a reinforcement part RF, and is attached to the housing HS via a mounting plate part 11A; a coil 12 which has a main wire bundle part MW and a sub wire bundle part SW, and is attached to the lower side of the main plate part 11B; and an upper magnet 15U which is attached to an upper yoke 10U on the upper side of the coil 12 and generates a magnetic flux directed toward the main wire bundle part MW. A left end LE1 of the upper magnet 15U is positioned on the inner side relative to a left end LE2 of the sub wire bundle part SW. A first reinforcement plate part RP1 of the reinforcement part RF extends upward from a position (point PS1) which is on the inner side relative to the left end LE2 of the sub wire bundle part SW and on the outer side relative to the left end LE1 of the upper magnet 15U.SELECTED DRAWING: Figure 14

Description

[Technical field]

[0001] The present disclosure relates to a vibration generating device. [Background technology]

[0002] Conventionally, a vibration motor (vibration generator) that generates vibrations has been known (see Patent Document 1). This vibration motor is composed of a fixed member including a coil supported by a coil stand fixed to a main housing via an L-shaped support part (reinforcement part), and a vibration member including a magnet steel set. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2017-022964 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, the support portion is disposed outside the coil so as to extend beyond the contour of the coil when viewed from above, which means that the vibration motor must be large in size to accommodate the support portion.

[0005] It is therefore desirable to provide a vibration generator that can be easily miniaturized. [Means for solving the problem]

[0006] A vibration generating device according to one embodiment of the present disclosure includes a housing, a movable body accommodated in the housing, a support member that supports the movable body so that it can vibrate along a first direction, a reinforcing portion including a main body plate portion extending in a second direction perpendicular to the first direction, and a first reinforcing plate portion extending from one end of the main body plate portion in the second direction via a first bent portion in a third direction perpendicular to the first direction and the second direction, and further includes a bracket attached to the housing via an attachment plate portion, a main bundle portion including a plurality of conductors extending in the second direction, and a reinforcing portion connecting two adjacent main bundle portions. the movable body on the other side of the coil in the third direction and generating a magnetic flux toward the main flux portion, wherein one end of the permanent magnet in the second direction is located inside one end of the sub flux portion in the second direction, and the first reinforcing plate portion is located inside one end of the sub flux portion in the second direction and extends from a position outside one end of the permanent magnet in the second direction toward the other side in the third direction. Effect of the Invention

[0007] The vibration generator described above can be easily miniaturized. [Brief description of the drawings]

[0008] [Figure 1] FIG. 2 is a perspective view of a vibration generating device. [Diagram 2] FIG. [Diagram 3] FIG. 2 is an exploded perspective view of a vibrating part and a non-vibrating body. [Figure 4] FIG. [Diagram 5] 5A to 5C are diagrams illustrating examples of configurations of a base member and an elastic support member. [Figure 6] FIG. 2 is a perspective view of a vibrating part and a non-vibrating body. [Figure 7] FIG. [Figure 8] FIG. [Figure 9] FIG. 2 is a perspective view of a base member and a bracket. [Figure 10] 4A and 4B are a top view and a cross-sectional view of a base member, a bracket, a coil, and a vibrating body. [Figure 11] FIG. 2 is a perspective view of each member constituting the vibration generating device. [Figure 12] FIG. 2 is a perspective view of each member constituting the vibration generating device. [Figure 13] 1 shows three views and a cross-sectional view of a bracket. [Figure 14] 4 is a cross-sectional view of a base member, a bracket, a coil, and a vibrating body. [Figure 15] 4 is a cross-sectional view of a base member, a bracket, a coil, and a vibrating body. [Figure 16] FIG. 13 is a perspective view of another example of the bracket. [Figure 17] FIG. 13 is a perspective view of yet another example of the bracket configuration. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Hereinafter, a vibration device VE including a vibration generator 101 according to an embodiment of the present disclosure will be described with reference to the drawings. Fig. 1 is a perspective view of the vibration device VE including the vibration generator 101 and a control unit CTR. Specifically, the upper view of Fig. 1 is a perspective view of the vibration generator 101 connected to the control unit CTR, and the lower view of Fig. 1 is a perspective view of the vibration generator 101 with a cover member 1 removed. Fig. 2 is an exploded perspective view of the vibration generator 101.

[0010] In each of FIG. 1 and FIG. 2, X1 represents one direction of the X axis constituting a three-dimensional orthogonal coordinate system, and X2 represents the other direction of the X axis. Moreover, Y1 represents one direction of the Y axis constituting the three-dimensional orthogonal coordinate system, and Y2 represents the other direction of the Y axis. Similarly, Z1 represents one direction of the Z axis constituting the three-dimensional orthogonal coordinate system, and Z2 represents the other direction of the Z axis. In this embodiment, the X1 side of the vibration generator 101 corresponds to the front side (front side) of the vibration generator 101, and the X2 side of the vibration generator 101 corresponds to the rear side (rear side) of the vibration generator 101. Moreover, the Y1 side of the vibration generator 101 corresponds to the left side of the vibration generator 101, and the Y2 side of the vibration generator 101 corresponds to the right side of the vibration generator 101. Moreover, the Z1 side of the vibration generator 101 corresponds to the upper side of the vibration generator 101, and the Z2 side of the vibration generator 101 corresponds to the lower side of the vibration generator 101. The same applies to the other figures.

[0011] The vibration device VE has a control unit CTR and a vibration generator 101. The vibration generator 101 has a housing HS and a vibration unit VP accommodated in the housing HS.

[0012] 1, the housing HS has a substantially rectangular parallelepiped shape. In this embodiment, the housing HS is made of a non-magnetic material such as austenitic stainless steel. The housing HS is made up of a cover member 1 and a base member 2.

[0013] 2, the cover member 1 is configured to form the side and top surfaces of the housing HS, and the base member 2 is configured to form the bottom surface of the housing HS. In the illustrated example, the base member 2 is configured to function as a base that supports the vibration part VP.

[0014] In the illustrated example, the cover member 1 has a substantially rectangular cylindrical outer circumferential wall portion 1A, and a flat top plate portion 1T provided so as to be continuous with the upper end (the end on the Z1 side) of the outer circumferential wall portion 1A.

[0015] The outer peripheral wall portion 1A has four side plate portions formed in a flat plate shape. Specifically, as shown in Fig. 2, the outer peripheral wall portion 1A has a first side plate portion 1A1 and a third side plate portion 1A3 that face each other, and a second side plate portion 1A2 and a fourth side plate portion 1A4 that are perpendicular to the first side plate portion 1A1 and the third side plate portion 1A3 and face each other.

[0016] The control unit CTR is configured to realize the movement of the vibration unit VP. In the illustrated example, the control unit CTR includes an electronic circuit and is configured to supply an alternating current to the vibration unit VP for vibrating the vibration unit VP. In the illustrated example, the control unit CTR is installed outside the housing HS, but it may be installed inside the housing HS. In this case, the control unit CTR may be one of the components of the vibration generator 101.

[0017] The vibrating part VP is configured to be able to vibrate the housing HS by vibrating itself. In the illustrated example, the vibrating part VP is configured to be attached inside the housing HS and to be able to vibrate the housing HS.

[0018] Next, details of the vibration part VP will be described with reference to Fig. 3. Fig. 3 is an exploded perspective view of the vibration part VP. The vibration part VP is configured to include a vibrating body VB, a driving means DM, and an elastic support member ES.

[0019] The vibrating body VB as a movable body has a predetermined natural frequency and is configured to be able to vibrate relative to the housing HS along a vibration axis VA (see FIG. 2) extending in a predetermined direction. In the illustrated example, the vibrating body VB has a predetermined natural frequency and is configured to be able to vibrate relative to the base member 2 along the vibration axis VA (see FIG. 2) extending in the X-axis direction (front-back direction).

[0020] The driving means DM is an example of a vibration force generating unit, and is configured to vibrate the vibrating body VB along the vibration axis VA. In the illustrated example, the driving means DM is configured to vibrate the vibrating body VB, which is elastically supported by the elastic support member ES, along the vibration axis VA in response to an AC current supplied through the control unit CTR.

[0021] The elastic support member ES is an example of a support member, and is configured to be interposed between the housing HS and the vibrating body VB so as to be able to elastically support the vibrating body VB.

[0022] Specifically, the vibrating part VP including the vibrating body VB, driving means DM, and elastic support member ES is composed of a yoke 10, a bracket 11, a coil 12, a wiring board 13, a magnet 15, and a leaf spring 17. The vibrating body VB is composed of the yoke 10 and the magnet 15, the driving means DM is composed of the coil 12 and the magnet 15, and the elastic support member ES is composed of the leaf spring 17. The bracket 11, the coil 12, and the wiring board 13 form a non-vibrating body NV that does not vibrate together with the vibrating body VB. The non-vibrating body NV vibrates together with the housing HS, but does not vibrate together with the vibrating body VB.

[0023] The yoke 10 is a member that constitutes a magnetic circuit. In the embodiment, the yoke 10 is made of a magnetic material including iron or the like. In the illustrated example, the yoke 10 is composed of two members, an upper yoke 10U and a lower yoke 10D, and is made of a cold-rolled steel plate (SPCC). The upper yoke 10U is a member that constitutes the upper surface of the vibrating body VB, and includes a left plate portion LW, a right plate portion RW, and a top plate portion TW. Specifically, a convex portion PR is formed on the Z2-side end surface of each of the left plate portion LW and the right plate portion RW so as to be engaged with a concave portion RC formed on the lower yoke 10D. The lower yoke 10D is a member that constitutes the lower surface of the vibrating body VB, and includes a bottom plate portion BW. Specifically, a concave portion RC is formed on each of the Y1-side (left side) end surface and the Y2-side (right side) end surface of the lower yoke 10D so as to be engaged with a convex portion PR formed on the upper yoke 10U.

[0024] The bracket 11 is an example of a conductive member, and is configured to support the coil 12 in a state where the coil 12 faces the magnet 15 without contacting it. That is, the bracket 11 is configured to function as a coil holder that supports the coil 12. The bracket 11 is fixed to the base member 2 so as not to come into contact with the vibrating body VB. In this embodiment, the bracket 11 is a plate-shaped member formed of a non-magnetic material such as copper, aluminum, or an alloy thereof, and has an attachment plate portion 11A and a main body plate portion 11B. Specifically, the bracket 11 is fixed to the base member 2 by fastening members, welding, adhesion, crimping, or the like via the four attachment plate portions 11A protruding outward from the main body plate portion 11B at a position where the bracket 11 and the coil 12 do not come into contact with the vibrating body VB even when the vibrating body VB vibrates. That is, the bracket 11 to which the coil 12 is attached is configured not to vibrate together with the vibrating body VB.

[0025] The coil 12 is configured to generate a magnetic field when supplied with a current. In the example shown in FIG. 3, the coil 12 includes three coil winding parts (a first coil winding part 12A, a second coil winding part 12B, and a third coil winding part 12C) connected in series. Each of the first coil winding part 12A, the second coil winding part 12B, and the third coil winding part 12C has a substantially elliptical shape (a rounded rectangle) having a major axis along the Y-axis direction. The coil 12 has a first end part 12S at the winding start side and a second end part 12E at the winding end side. The coil 12 is fixed to the surface of the bracket 11 on the Z2 side (lower side) by adhesive or the like. The surface of the conductor wire (a wire material made of copper or a copper alloy or the like) constituting the coil 12 is insulated. In FIG. 3, for clarity, the coil 12 is illustrated in a simplified state, and a detailed winding state is omitted. The same is true in other figures.

[0026] The wiring board 13 is a member to which the first end 12S and the second end 12E of the coil 12 are connected. In the illustrated example, the wiring board 13 is fixed to the Z2 side (lower side) surface of the bracket 11 with an adhesive as shown in the lower diagram of Fig. 4. Fig. 4 is a perspective view of the non-vibrating body NV. Specifically, the upper diagram of Fig. 4 is an upper perspective view of the non-vibrating body NV, and the lower diagram of Fig. 4 is a lower perspective view of the non-vibrating body NV.

[0027] In the illustrated example, the wiring board 13 is a flexible wiring board having flexibility, and includes a left wiring board 13L and a right wiring board 13R. The left wiring board 13L and the right wiring board 13R are fixed to the end of the bracket 11 on the X1 side (front side) by adhesive or the like. As shown in the lower diagram of FIG. 4, the first end 12S of the coil 12 is connected to the inner conductor pattern PI of the right wiring board 13R by solder or conductive adhesive or the like, and the second end 12E of the coil 12 is connected to the inner conductor pattern PI of the left wiring board 13L by solder or conductive adhesive or the like. The outer conductor patterns PE of the left wiring board 13L and the right wiring board 13R are connected to the conductors from the control unit CTR by solder or conductive adhesive or the like.

[0028] Each of the first coil winding portion 12A, the second coil winding portion 12B, and the third coil winding portion 12C has an air-core portion AC. The first end portion 12S, the first coil winding portion 12A, the second coil winding portion 12B, the third coil winding portion 12C, and the second end portion 12E are connected by a conductor portion CP. Specifically, the conductor portion CP includes a first conductor portion CP1 to a fourth conductor portion CP4, as shown in FIG. 3. The first end portion 12S and the first coil winding portion 12A are connected by a first conductor portion CP1, the first coil winding portion 12A and the second coil winding portion 12B are connected by a second conductor portion CP2, the second coil winding portion 12B and the third coil winding portion 12C are connected by a third conductor portion CP3, and the third coil winding portion 12C and the second end portion 12E are connected by a fourth conductor portion CP4.

[0029] 4, the coil 12 includes a main bundle portion MW extending along the Y-axis direction and a sub bundle portion SW connecting two adjacent main bundle portions MW. In the illustrated example, the main bundle portion MW has a rectangular shape in top view and includes a plurality of conductors extending in the Y-axis direction (left-right direction), and the sub bundle portion SW has a substantially semicircular shape in top view and includes a plurality of conductors extending concentrically. Specifically, the first coil winding portion 12A has a front main bundle wire portion 12A1, a rear main bundle wire portion 12A2, a left sub-bundle wire portion 12A3, and a right sub-bundle wire portion 12A4, the second coil winding portion 12B has a front main bundle wire portion 12B1, a rear main bundle wire portion 12B2, a left sub-bundle wire portion 12B3, and a right sub-bundle wire portion 12B4, and the third coil winding portion 12C has a front main bundle wire portion 12C1, a rear main bundle wire portion 12C2, a left sub-bundle wire portion 12C3, and a right sub-bundle wire portion 12C4. The main bundle wire portion MW includes the front main bundle wire portion 12A1, the rear main bundle wire portion 12A2, the front main bundle wire portion 12B1, the rear main bundle wire portion 12B2, the front main bundle wire portion 12C1, and the rear main bundle wire portion 12C2. The sub-bundle portion SW includes a left sub-bundle portion 12A3, a right sub-bundle portion 12A4, a left sub-bundle portion 12B3, a right sub-bundle portion 12B4, a left sub-bundle portion 12C3, and a right sub-bundle portion 12C4. In the lower diagram of Fig. 4, for clarity, a dot pattern is applied to the main bundle portion MW of the coil 12.

[0030] The magnet 15 is an example of a magnetic flux generating member, and constitutes the driving means DM together with the coil 12. In the illustrated example, the magnet 15 includes an upper magnet 15U and a lower magnet 15D as shown in FIG. 3. Each of the upper magnet 15U and the lower magnet 15D is an eight-pole magnetized permanent magnet having a substantially rectangular parallelepiped outer shape. Specifically, the upper magnet 15U includes the first upper magnet portion 15U1 to the fourth upper magnet portion 15U4, and the lower magnet 15D includes the first lower magnet portion 15D1 to the fourth lower magnet portion 15D4. Each of the first upper magnet portion 15U1 to the fourth upper magnet portion 15U4 and the first lower magnet portion 15D1 to the fourth lower magnet portion 15D4 includes one N pole portion and one S pole portion. In the illustrated example, the top surfaces of the first upper magnet portion 15U1, the third upper magnet portion 15U3, the first lower magnet portion 15D1, and the third lower magnet portion 15D3 are N poles, and the top surfaces of the second upper magnet portion 15U2, the fourth upper magnet portion 15U4, the second lower magnet portion 15D2, and the fourth lower magnet portion 15D4 are S poles. In FIG. 3, for clarity, a dot pattern is applied to the N pole of the eight-pole magnetized permanent magnet, and a cross pattern is applied to the S pole. The same is true in other figures. Each of the upper magnet 15U and the lower magnet 15D may be a combination of four two-pole magnetized permanent magnets, or a combination of two four-pole magnetized permanent magnets.

[0031] The leaf spring 17 is an example of an elastic support member ES that is interposed between the housing HS and the vibrating body VB and is configured to elastically support the vibrating body VB. In this embodiment, the leaf spring 17 is made of a non-magnetic material such as austenitic stainless steel, and has a connection portion 17A, a vibrating body support portion 17B, and an elastic arm portion 17C, as shown in FIG.

[0032] Specifically, the leaf spring 17 is formed by punching and bending a metal plate made of austenitic stainless steel with a thickness of 0.2 mm, for example. More specifically, as shown in Fig. 5, the connection portion 17A of the leaf spring 17 is welded to the bottom plate portion 2B of the base member 2. The leaf spring 17 is attached to the base member 2 only via the connection portion 17A, with a gap GP formed between the bottom plate portion 2B of the base member 2 and the vibration body support portion 17B so that the vibration body support portion 17B and the elastic arm portion 17C do not come into contact with the base member 2.

[0033] Fig. 5 is a diagram showing a configuration example of the base member 2 and the elastic support member ES (leaf spring 17). Specifically, the upper diagram of Fig. 5 is a perspective view of the base member 2 to which the elastic support member ES (leaf spring 17) is attached. The lower diagram of Fig. 5 is a front view of the base member 2 to which the elastic support member ES (leaf spring 17) is attached, and corresponds to an enlarged view of the area R1 surrounded by a dashed line in the upper diagram of Fig. 5. Note that in Fig. 5, a dot pattern is applied to the elastic support member ES (leaf spring 17) for clarity.

[0034] In this embodiment, as shown in the upper diagram of FIG. 5, the connection portion 17A of the leaf spring 17 includes a first connection portion 17A1 to a fourth connection portion 17A4, and the elastic arm portion 17C of the leaf spring 17 includes a first elastic arm portion 17C1 to a fourth elastic arm portion 17C4.

[0035] As shown in the upper diagram of FIG. 5, each of the first connecting portion 17A1 to the fourth connecting portion 17A4 is fixed to the bottom plate portion 2B of the base member 2 by welding. Also, as shown in FIG. 6, the vibrating body VB is welded to the vibrating body support portion 17B of the leaf spring 17. FIG. 6 is a perspective view of the vibrating portion VP. Specifically, the upper diagram of FIG. 6 is a perspective view of the vibrating portion VP (elastic support member ES and vibrating body VB) in a state in which the non-vibrating body NV (bracket 11, coil 12, and wiring board 13) is omitted, and the lower diagram of FIG. 6 is a perspective view of the vibrating portion VP in a state in which the non-vibrating body NV is illustrated. In addition, in the lower diagram of FIG. 6, a dot pattern is applied to the vibrating portion (vibrating body VB and elastic support member ES) for clarity. The presence or absence of a dot pattern indicates that the non-vibrating body NV, which is not provided with a dot pattern, is fixed to the base member 2 (not shown in the lower diagram of FIG. 6) so as not to come into contact with the vibrating body VB, which is provided with a dot pattern. The lower diagram in FIG. 1 shows a non-vibrating body NV fixed to a base member 2 so as not to come into contact with the vibrating body VB.

[0036] Specifically, the vibrating body VB is composed of an upper yoke 10U, an upper magnet 15U, a lower magnet 15D, and a lower yoke 10D, as shown in the upper diagram of Fig. 6. The Z2 side (lower side) surface of the bottom plate part BW of the lower yoke 10D is welded to the Z1 side (upper side) surface of the vibrating body support part 17B of the leaf spring 17.

[0037] When an AC current is applied to the coil 12 via the wiring board 13 in the state shown in the lower diagram of FIG. 6, the vibrating body VB vibrates along the vibration axis VA.

[0038] Here, referring to FIG. 7, the positional relationship of the components of the driving means DM when the vibrating body VB vibrates along the vibration axis VA will be described. FIG. 7 is a perspective view of the components of the driving means DM. Specifically, the upper diagram of FIG. 7 shows the positional relationship between the non-vibrating body NV (coil 12) and the vibrating body VB (magnet 15) when a current flows in one direction in the coil 12 and the vibrating body VB (magnet 15) moves to the furthest X2 side (rear side). The center diagram of FIG. 7 shows the positional relationship between the non-vibrating body NV (coil 12) and the vibrating body VB (magnet 15) when no current flows in the coil 12. The lower diagram of FIG. 7 shows the positional relationship between the non-vibrating body NV (coil 12) and the vibrating body VB (magnet 15) when a current flows in the other direction in the coil 12 and the vibrating body VB (magnet 15) moves to the furthest X1 side (front side).

[0039] When no current flows through the coil 12, the coil 12 does not generate a magnetic field, and therefore no repulsive or attractive force occurs between the coil 12 and the magnet 15. Therefore, the magnet 15 is positioned in a neutral position such that its center faces the center of the coil 12 (second coil winding portion 12B), as shown in the center of Fig. 7. Specifically, the vibrating body VB (magnet 15) in a position other than the neutral position is urged by the elastic support member ES (leaf spring 17) to return to the neutral position.

[0040] When current flows from the first end 12S to the second end 12E of the coil 12, the first coil winding portion 12A generates a magnetic field such that the Z1 side is a north pole and the Z2 side is a south pole, the second coil winding portion 12B generates a magnetic field such that the Z2 side is a north pole and the Z1 side is a south pole, and the third coil winding portion 12C generates a magnetic field such that the Z1 side is a north pole and the Z2 side is a south pole. As a result, the N-pole portion of the second upper magnet portion 15U2 is moved away from the first coil winding portion 12A and attracted toward the second coil winding portion 12B, the S-pole portion of the third upper magnet portion 15U3 is moved away from the second coil winding portion 12B and attracted toward the third coil winding portion 12C, the S-pole portion of the second lower magnet portion 15D2 is moved away from the first coil winding portion 12A and attracted toward the second coil winding portion 12B, and the N-pole portion of the third lower magnet portion 15D3 is moved away from the second coil winding portion 12B and attracted toward the third coil winding portion 12C, so that the vibrating body VB (magnet 15) moves toward the X2 side (rear side) as indicated by arrow AR1 in the upper diagram of Figure 7.

[0041] Conversely, when current flows from the second end 12E of the coil 12 to the first end 12S, the first coil winding portion 12A generates a magnetic field such that the Z1 side is a south pole and the Z2 side is a north pole, the second coil winding portion 12B generates a magnetic field such that the Z2 side is a south pole and the Z1 side is a north pole, and the third coil winding portion 12C generates a magnetic field such that the Z1 side is a south pole and the Z2 side is a north pole. As a result, the N-pole portion of the second upper magnet portion 15U2 is moved away from the second coil winding portion 12B and attracted toward the first coil winding portion 12A, the S-pole portion of the third upper magnet portion 15U3 is moved away from the third coil winding portion 12C and attracted toward the second coil winding portion 12B, the S-pole portion of the second lower magnet portion 15D2 is moved away from the second coil winding portion 12B and attracted toward the first coil winding portion 12A, and the N-pole portion of the third lower magnet portion 15D3 is moved away from the third coil winding portion 12C and attracted toward the second coil winding portion 12B, so that the vibrating body VB (magnet 15) moves toward the X1 side (front side) as shown by arrow AR2 in the lower diagram of Figure 7.

[0042] The control unit CTR can alternately reverse the direction of the magnetic field generated by the coil 12 by alternately reversing the direction of the current flowing through the coil 12, and thus can vibrate the vibrating body VB (magnet 15) along the vibration axis VA (X-axis direction).

[0043] Next, the movement of the elastic arm portion 17C when the vibrating body VB vibrates will be described with reference to Fig. 8. Fig. 8 is a perspective view of the leaf spring 17. Specifically, the upper diagram of Fig. 8 shows the state of the leaf spring 17 when no current flows through the coil 12, that is, when the vibrating body VB is in a neutral position (not vibrating). The lower diagram of Fig. 8 shows the state of the leaf spring 17 when the vibrating body VB moves to the X2 side (rear side).

[0044] The elastic arm portion 17C is provided between the connection portion 17A and the vibrating body support portion 17B, as shown in the upper diagram of Fig. 8. Specifically, the first elastic arm portion 17C1 is provided between the first connection portion 17A1 and the vibrating body support portion 17B, the second elastic arm portion 17C2 is provided between the second connection portion 17A2 and the vibrating body support portion 17B, the third elastic arm portion 17C3 is provided between the third connection portion 17A3 and the vibrating body support portion 17B, and the fourth elastic arm portion 17C4 is provided between the fourth connection portion 17A4 and the vibrating body support portion 17B.

[0045] When the vibrator VB (not shown in FIG. 8) is moved in the direction indicated by the arrow AR3 by the driving means DM, the elastic arm 17C bends as shown in the lower diagram of FIG. 8, enabling the translation of the vibrator VB in the X2 direction. Note that in FIG. 8, for clarity, a dot pattern is added to the part of the elastic arm 17C that is relatively bent.

[0046] Conversely, when the vibrator VB is moved by the driving means DM in the direction opposite (X1 direction) to the direction indicated by the arrow AR3 (X2 direction), the elastic arm portion 17C bends in the direction opposite to the bending direction shown in the lower diagram of Figure 8, enabling the vibrator VB to translate in the X1 direction.

[0047] Here, referring again to FIG. 3, the details of the upper yoke 10U will be described. The upper yoke 10U has a top plate portion TW, a right plate portion RW, and a left plate portion LW. Specifically, the left plate portion LW extending in the Z2 direction is formed at the end of the Y1 side of the top plate portion TW, and the right plate portion RW extending in the Z2 direction is formed at the end of the Y2 side of the top plate portion TW. In addition, a protrusion portion PR is formed at the lower end of each of the left plate portion LW and the right plate portion RW so as to mesh with the recess portion RC formed in the lower yoke 10D. The upper diagram of FIG. 6 shows a state in which the recess portion RC formed in the lower yoke 10D and the protrusion portion PR of the upper yoke 10U are meshed with each other.

[0048] When assembling the vibrating body VB, the upper magnet 15U is attached to the top plate portion TW (see FIG. 3) of the upper yoke 10U, the lower magnet 15D is attached to the bottom plate portion BW (see FIG. 3) of the lower yoke 10D, and further, the convex portion PR of the upper yoke 10U and the concave portion RC of the lower yoke 10D are engaged with each other. Thus, in this embodiment, the upper yoke 10U and the lower yoke 10D surrounding the magnet 15 are separate members to simplify the assembly of the vibrating body VB.

[0049] 6, the Z1 side (upper side) surface of the upper magnet 15U is magnetically joined to the Z2 side (lower side) surface of the top plate portion TW of the upper yoke 10U, and the Z2 side (lower side) surface of the lower magnet 15D is magnetically joined to the Z1 side (upper side) surface of the bottom plate portion BW of the lower yoke 10D. In the space surrounded by the upper yoke 10U and the lower yoke 10D, as shown in the lower diagram of FIG. 6, the coil 12 fixed to the bracket 11 is installed on the Z2 side of the upper magnet 15U and on the Z1 side of the lower magnet 15D, without contacting the upper magnet 15U and the lower magnet 15D.

[0050] As shown in Fig. 9, the bracket 11 is attached to the base member 2 by engaging an attachment plate portion 11A provided on the bracket 11 with a support portion 2P provided on the base member 2. Fig. 9 is a diagram showing an example of the configuration of the base member 2 and the bracket 11. Specifically, the upper diagram of Fig. 9 is a perspective view of the bracket 11, the center diagram of Fig. 9 is a perspective view of the base member 2, and the lower diagram of Fig. 9 is a perspective view of the bracket 11 attached to the base member 2.

[0051] As shown in FIG. 9, the mounting plate portion 11A includes a first mounting plate portion 11A1 to a fourth mounting plate portion 11A4. The support portion 2P includes a first support portion 2P1 to a fourth support portion 2P4. The first mounting plate portion 11A1 is engaged with the first support portion 2P1, the second mounting plate portion 11A2 is engaged with the second support portion 2P2, the third mounting plate portion 11A3 is engaged with the third support portion 2P3, and the fourth mounting plate portion 11A4 is engaged with the fourth support portion 2P4. In the illustrated example, the mounting plate portion 11A and the support portion 2P are joined by welding. Specifically, a through hole 11H is formed in each of the first mounting plate portion 11A1 to the fourth mounting plate portion 11A4, and a convex portion 2Q protruding upward is formed in each of the first support portion 2P1 to the fourth support portion 2P4. The joining (joining by laser welding) between the first attachment plate portion 11A1 and the first support portion 2P1 is realized by irradiating the protrusion 2Q of the first support portion 2P1 with a laser while the protrusion 2Q is inserted into the through hole 11H in the first attachment plate portion 11A1. The same applies to the joining between the second attachment plate portion 11A2 and the second support portion 2P2, the joining between the third attachment plate portion 11A3 and the third support portion 2P3, and the joining between the fourth attachment plate portion 11A4 and the fourth support portion 2P4. However, the attachment plate portion 11A and the support portion 2P may be joined by a fastening member, an adhesive, caulking, or the like.

[0052] Next, the magnetic flux generated by the magnet 15 will be described with reference to FIG. 10. FIG. 10 is a diagram showing a configuration example of the base member 2, the bracket 11, the coil 12, and the vibrating body VB. Specifically, the upper diagram of FIG. 10 is a top view of the base member 2, the bracket 11, and the vibrating body VB. In the upper diagram of FIG. 10, a dot pattern is added to the bracket 11 for clarity. The lower diagram of FIG. 10 is a cross-sectional view of the base member 2, the bracket 11, the coil 12, and the vibrating body VB. Specifically, the lower diagram of FIG. 10 is a cross-sectional view of the base member 2, the bracket 11, the coil 12, and the vibrating body VB in a virtual plane parallel to the XZ plane including the dashed line L2 in the upper diagram of FIG. 10, as viewed from the Y2 side. More specifically, the lower diagram of Fig. 10 shows a vibrating body VB formed by an upper yoke 10U, an upper magnet 15U, a lower magnet 15D, and a lower yoke 10D, and a coil 12 installed inside a space surrounded by the upper yoke 10U and the lower yoke 10D (a space sandwiched between the upper magnet 15U and the lower magnet 15D). The magnet 15 generates a magnetic flux represented by magnetic field lines MF as shown by dotted lines in the lower diagram of Fig. 10. In the example shown in the lower diagram of Fig. 10, the magnetic field lines MF include a first magnetic field line MF1 to a sixth magnetic field line MF6.

[0053] Specifically, when no current flows through the coil 12, the first magnetic field line MF1 exits from the N-pole portion of the first lower magnet portion 15D1 of the lower magnet 15D, passes through the front main flux portion 12A1 of the first coil winding portion 12A, and enters the S-pole portion of the first upper magnet portion 15U1 of the upper magnet 15U. The second magnetic field line MF2 exits from the N-pole portion of the second upper magnet portion 15U2 of the upper magnet 15U, passes through the rear main flux portion 12A2 of the first coil winding portion 12A, and enters the S-pole portion of the second lower magnet portion 15D2 of the lower magnet 15D. The third magnetic field line MF3 exits from the N-pole portion of the second upper magnet portion 15U2 of the upper magnet 15U, passes through the front main flux portion 12B1 of the second coil winding portion 12B, and enters the S-pole portion of the second lower magnet portion 15D2 of the lower magnet 15D. The fourth magnetic field line MF4 exits from the N-pole portion of the third lower magnet portion 15D3 of the lower magnet 15D, passes through the rear main flux portion 12B2 of the second coil winding portion 12B, and enters the S-pole portion of the third upper magnet portion 15U3 of the upper magnet 15U. The fifth magnetic field line MF5 exits from the N-pole portion of the third lower magnet portion 15D3 of the lower magnet 15D, passes through the front main flux portion 12C1 of the third coil winding portion 12C, and enters the S-pole portion of the third upper magnet portion 15U3 of the upper magnet 15U. The sixth magnetic field line MF6 exits from the N-pole portion of the fourth upper magnet portion 15U4 of the upper magnet 15U, passes through the rear main flux portion 12C2 of the third coil winding portion 12C, and enters the S-pole portion of the fourth lower magnet portion 15D4 of the lower magnet 15D.

[0054] Therefore, in the space surrounded by upper yoke 10U and lower yoke 10D, magnetic flux density is high because magnetic field lines are concentrated in the partial space between upper magnet 15U and lower magnet 15D, and coil 12 is placed in this partial space. Therefore, in this configuration, by passing a current between first end 12S and second end 12E of coil 12, Lorentz force can be efficiently generated and vibrating body VB can be efficiently vibrated along the X-axis direction.

[0055] For example, when a current flows from the first end 12S to the second end 12E of the coil 12, the vibrating body VB moves to the X2 side (rear side). When a current flows from the second end 12E to the first end 12S of the coil 12, the vibrating body VB moves to the X1 side (front side). Therefore, the control unit CTR can vibrate the vibrating body VB along the vibration axis VA by passing a current through the coil 12 so that the direction of the current alternately reverses. Note that the bracket 11 to which the coil 12 is attached is fixed to the base member 2, and is not fixed to the vibrating body VB, so that the bracket 11 and the coil 12 do not vibrate together with the vibrating body VB.

[0056] Furthermore, when the vibrating body VB vibrates along the vibration axis VA, the magnetic flux (hereinafter referred to as "effective magnetic flux") extending in the Z-axis direction generated between the upper magnet 15U and the lower magnet 15D included in the vibrating body VB also vibrates along the vibration axis VA. That is, the effective magnetic flux that crosses the bracket 11 as a conductive member between the upper magnet 15U and the lower magnet 15D vibrates along the vibration axis VA while maintaining the relationship of crossing the bracket 11. Therefore, an eddy current flows in the main body plate portion 11B of the bracket 11. In the illustrated example, the upper magnet 15U, the lower magnet 15D, and the bracket 11 are arranged so that the effective magnetic flux and the main body plate portion 11B are perpendicular to each other.

[0057] The vibrating body VB is constantly subjected to a damping force, which is a force caused by eddy currents and acts in the direction opposite to the vibration direction. Specifically, while the vibrating body VB is vibrated by the Lorentz force generated by the driving means DM, the vibrating body VB is subjected to a damping force that acts to decelerate the vibration. The damping force increases in proportion to the vibration speed of the vibrating body VB. Therefore, the vibration acceleration at the natural frequency of the vibrating body VB and frequencies near it is reduced by the damping force.

[0058] The braking force caused by eddy currents increases as the eddy currents increase. The eddy currents also increase as the resistivity of the conductive member (bracket 11) decreases, as the conductivity of the conductive member (bracket 11) increases, and as the thickness of the conductive member (bracket 11) (thickness of main body plate portion 11B) increases. Therefore, the material and thickness of bracket 11 are selected so as to obtain a desired braking force. In the illustrated example, bracket 11 is made of tough pitch copper, which is the same material as the wire material of coil 12, and has a thickness of about 0.3 mm.

[0059] This configuration improves the durability of the vibration generator 101 compared to a case in which a viscoelastic member for generating a braking force is attached between the vibrating body VB and the non-vibrating body NV. This is because the bracket 11 is less susceptible to the effects of viscoelastic members, such as the ambient temperature, dimensional variations, deterioration, peeling, or breaking.

[0060] 4, the bracket 11 is formed to have a plurality of openings (three first openings H1, three second openings H2, and six third openings H3). At least one of the plurality of openings may be a notch.

[0061] The first opening H1 is a non-circular (approximately teardrop-shaped) opening that prevents the upper surface of the coil 12 from tilting relative to the lower surface of the main body plate portion 11B due to interference between the main body plate portion 11B and the conductor portion CP when the coil 12 is attached to the lower surface of the main body plate portion 11B of the bracket 11.

[0062] The second opening H2 is a substantially circular opening for receiving a jig (not shown) used for positioning the hollow core portion AC of the coil 12. The jig (not shown) is, for example, a cylindrical rod member. In the illustrated example, the first opening H1 also functions as an opening for receiving the jig.

[0063] The third opening H3 is an approximately circular opening formed for inserting a jig to maintain an appropriate clearance between the bracket 11 and the coil 12 when supplying adhesive between the lower surface of the main body plate portion 11B of the bracket 11 and the upper surface of the coil 12.

[0064] In the illustrated example, the first opening H1 to the third opening H3 are all formed at positions that avoid the locus TR. The locus TR is a locus on the main body plate part 11B through which the central axis of the effective magnetic flux passes when the vibrating body VB vibrates. That is, the vibration generator 101 is configured so that the central axis of the effective magnetic flux extending along the Z-axis direction moves in the X-axis direction along a linear locus TR. In the illustrated example, the central axis of the effective magnetic flux includes the central axes of the effective magnetic flux generated by the first lower magnet part 15D1, the second upper magnet part 15U2, the third lower magnet part 15D3, and the fourth upper magnet part 15U4, as shown by the magnetic field lines MF in FIG. 10. In addition, the locus TR is located on the vibration axis VA in top view. The central axis of the effective magnetic flux may be interpreted as the coil axes of the first coil winding part 12A, the second coil winding part 12B, and the third coil winding part 12C.

[0065] In other words, the first opening H1 to the third opening H3 are all formed at positions avoiding the central region CR. The central region CR is a region in the central portion of the main body plate portion 11B that includes the locus TR. Specifically, the central region CR is a region through which eddy currents flow that are generated by the effective magnetic flux generated by the magnet 15 and the conductive member (bracket 11) that is placed so as to cross the effective magnetic flux. In the upper diagram of FIG. 4, a dot pattern is added to the central region CR for clarity.

[0066] In the illustrated example, the vibration generator 101 has no openings such as the first opening H1 to the third opening H3 in the rectangular central region CR of the main body plate 11B, which provides the effect that eddy currents flow more easily than when openings are formed in the central region CR. Also, the vibration generator 101 has a rectangular central region CR in the main body plate 11B that is flat and has no recesses, protrusions, or the like, which provides the effect that eddy currents flow more easily than when recesses, protrusions, or the like are formed in the central region CR and it is not flat.

[0067] In addition, the central region CR is symmetrical with respect to the vibration axis VA in a top view, and is also symmetrical with respect to the line segment L1 (see the upper diagram in FIG. 4) that represents the left-right axis passing through the center point of the bracket 11. This configuration brings about the effect that the magnitude of the braking force when the vibrating body VB moves forward (in the X1 direction) is the same as the magnitude of the braking force when the vibrating body VB moves backward (in the X2 direction).

[0068] Next, a method of assembling the electromagnetic exciter 101 will be described with reference to Fig. 11 and Fig. 12. Fig. 11 and Fig. 12 are perspective views of the components constituting the electromagnetic exciter 101. For clarity, dot patterns are added to newly attached components in Fig. 11 and Fig. 12.

[0069] Specifically, the upper figure in Figure 11 is an oblique view of leaf spring 17, the central figure in Figure 11 is an oblique view of leaf spring 17 with a lower yoke 10D attached, and the lower figure in Figure 11 is an oblique view of base member 2 with leaf spring 17 attached in the state shown in the central figure in Figure 11.

[0070] The top figure in Figure 12 is an oblique view of the base member 2 to which a lower magnet 15D is further attached, the second figure from the top in Figure 12 is an oblique view of the base member 2 to which a bracket 11 and a coil 12 are further attached, the third figure from the top in Figure 12 is an oblique view of the base member 2 to which an upper magnet 15U, an upper yoke 10U and a wiring board 13 are further attached, and the bottom figure in Figure 12 is an oblique view of the base member 2 to which a cover member 1 is further attached, i.e., an oblique view of the vibration generating device 101.

[0071] First, the lower yoke 10D is placed on the upper surface of the vibrating body support portion 17B of the leaf spring 17, as shown in the center diagram of Fig. 11. In the illustrated example, the bottom plate portion BW of the lower yoke 10D is placed on the upper surface of the vibrating body support portion 17B without applying adhesive. Note that a vibration-damping steel plate (not shown) may be attached to the outer surface of the standing portion EP of the elastic arm portion 17C of the leaf spring 17 as a reinforcing material for suppressing bending of the standing portion EP.

[0072] Thereafter, the leaf spring 17 on which the lower yoke 10D is placed is placed on the upper surface of the bottom plate portion 2B of the base member 2, as shown in the lower diagram of Fig. 11. Then, the lower yoke 10D and the leaf spring 17 are joined, and the base member 2 and the leaf spring 17 are joined. In the illustrated example, the bottom plate portion BW of the lower yoke 10D is joined to the upper surface of the vibrating body support portion 17B of the leaf spring 17 by laser welding, and the connection portion 17A of the leaf spring 17 is joined to the upper surface of the bottom plate portion 2B of the base member 2 by laser welding.

[0073] Then, the lower magnet 15D is placed on the upper surface of the bottom plate portion BW of the lower yoke 10D, as shown in the top diagram of Fig. 12. In the illustrated example, the lower yoke 10D and the lower magnet 15D are attracted to each other by magnetic force, so they are not joined by laser welding, and are not joined by adhesive. However, the lower yoke 10D and the lower magnet 15D may be joined by laser welding or adhesive.

[0074] Thereafter, the non-vibrating body NV is attached to the base member 2, as shown in the second diagram from the top in Fig. 12. In the illustrated example, the non-vibrating body NV is composed of a bracket 11, a coil 12, and a wiring board 13. Then, the support portion 2P of the base member 2 and the mounting plate portion 11A of the bracket 11 are joined by a fastening member, crimping, laser welding, an adhesive, or the like. In the illustrated example, the support portion 2P and the mounting plate portion 11A are joined by an adhesive. Note that, before the non-vibrating body NV is attached to the base member 2, the coil 12 is joined to the bracket 11 by an adhesive, and the wiring board 13 is joined to the bracket 11 by double-sided tape.

[0075] Thereafter, the upper yoke 10U to which the upper magnet 15U is attached is joined to the lower yoke 10D at a position where it does not contact the non-vibrating body NV, as shown in the third diagram from the top of Fig. 12. Specifically, the upper yoke 10U and the lower yoke 10D are joined by welding, adhesive, or the like at a portion where a recess RC formed in the lower yoke 10D and a protrusion PR of the upper yoke 10U engage with each other. In the illustrated example, the upper yoke 10U and the lower yoke 10D are joined by laser welding.

[0076] The upper magnet 15U is placed on the lower surface of the top plate portion TW of the upper yoke 10U in the same manner as when the lower magnet 15D is placed on the upper surface of the bottom plate portion BW of the lower yoke 10D before the upper yoke 10U is joined to the lower yoke 10D. The upper yoke 10U and the upper magnet 15U are attracted to each other by magnetic force, so they are not joined by laser welding, nor are they joined with an adhesive. However, the upper yoke 10U and the upper magnet 15U may be joined by laser welding or an adhesive.

[0077] 12, the cover member 1 is attached so as to cover the members other than the base member 2 and the wiring board 13. In the illustrated example, the lower end of the outer peripheral wall portion 1A of the cover member 1 and the peripheral edge portion of the bottom plate portion 2B of the base member 2 are joined by laser welding. Note that the cover member 1 and the base member 2 may be joined by a fastening member, an adhesive, caulking, or the like.

[0078] In this manner, the vibration generating device 101 is assembled. The adhesive used in the above-described assembly process may be any of a thermosetting adhesive, a light-curing adhesive, a moisture-curing adhesive, and a hybrid adhesive that is a combination of these. In the illustrated example, the adhesive is a thermosetting adhesive.

[0079] Next, the reinforcing structure of the bracket 11 will be described in detail with reference to Fig. 13. Fig. 13 shows three views (top view, front view, and right side view) and a cross-sectional view of the bracket 11. Specifically, the bottom view of Fig. 13 shows a cross-section of the base member 2 on a virtual plane parallel to the YZ plane including the dashed dotted line L3 in the top view of Fig. 13, as viewed from the X1 side.

[0080] In the illustrated example, the bracket 11 is formed from a rolled copper plate. Therefore, the bracket 11 has rolling marks (roll marks RM). The dashed lines drawn on the upper surface of the main body plate portion 11B of the bracket 11 in Fig. 13 represent the roll marks RM.

[0081] Further, reinforcing parts RF are formed at the left and right ends of the main body plate part 11B. In the illustrated example, the reinforcing parts RF are so-called Z-bent (step-bent) parts, and are configured so that the bending line FL on the lower side of the reinforcing parts RF is perpendicular to the roll eye RM. Specifically, a left reinforcing part RFL is formed at the left end of the main body plate part 11B, and a right reinforcing part RFR is formed at the right end of the main body plate part 11B.

[0082] As shown in the cross-sectional view, the left reinforcing part RFL has a first bent part FD1 bent upward from the left end of the main body plate part 11B, a first reinforcing plate part RP1 extending upward from the upper end of the first bent part FD1, a second bent part FD2 bent left from the upper end of the first reinforcing plate part RP1, and a second reinforcing plate part RP2 extending left from the left end of the second bent part FD2.

[0083] As shown in Fig. 13, the mounting plate portion 11A extends outward from the outer end of the second reinforcing plate portion RP2. Specifically, the first mounting plate portion 11A1 is formed so as to extend rightward from the right rear end of the second reinforcing plate portion RP2 of the right side reinforcing portion RFR, and the second mounting plate portion 11A2 is formed so as to extend rightward from the right front end of the second reinforcing plate portion RP2 of the right side reinforcing portion RFR. Similarly, the third mounting plate portion 11A3 is formed so as to extend leftward from the left front end of the second reinforcing plate portion RP2 of the left side reinforcing portion RFL, and the fourth mounting plate portion 11A4 is formed so as to extend leftward from the left rear end of the second reinforcing plate portion RP2 of the left side reinforcing portion RFL.

[0084] Furthermore, bracket 11 has, on both sides of its front end, pedestal portions FP for placing the inner conductor pattern PI (see the lower diagram in FIG. 4) of wiring board 13. Specifically, bracket 11 includes a left pedestal portion FPL for placing the inner conductor pattern PI of left wiring board 13L, and a right pedestal portion FPR for placing the inner conductor pattern PI of right wiring board 13R.

[0085] Next, referring to FIG. 14, the positional relationship between the base member 2, the yoke 10, the bracket 11, the coil 12, and the magnet 15 will be described. FIG. 14 is a cross-sectional view of the base member 2, the yoke 10, the bracket 11, the coil 12, and the magnet 15. Specifically, the upper view of FIG. 14 is a cross-sectional view of each member on a virtual plane parallel to the YZ plane including the dashed line L4 in the upper view of FIG. 10, as viewed from the X1 side. The lower view of FIG. 14 corresponds to an enlarged view of the range R2 surrounded by the dashed line in the upper view of FIG. 14. In addition, in the lower view of FIG. 14, for clarity, a cross pattern is applied to the cross section of the first bent portion FD1 and the second bent portion FD2 constituting the left reinforcing portion RFL, a dot pattern is applied to the cross section of the first reinforcing plate portion RP1 and the second reinforcing plate portion RP2 constituting the left reinforcing portion RFL, and a diagonal line pattern is applied to the other cross sections, which indicate that they are cross sections of metal members.

[0086] In the illustrated example, the reinforcing part RF is arranged so that at least a part of it is located in the space SP, as shown in the lower diagram of FIG. 14. The space SP corresponds to a part of the space located above the coil 12 that is not occupied by the upper magnet 15U. Specifically, the space SP corresponds to a part of the space located above the sub-bundle part SW of the coil 12 that is not occupied by the upper magnet 15U. No permanent magnet is arranged in this space SP. This is because even if a permanent magnet is arranged, the permanent magnet cannot efficiently generate a driving force suitable for driving the vibrating body VB. Therefore, this space SP is suitable as a place for arranging at least a part of the reinforcing part RF without reducing the driving force by the driving means DM.

[0087] Specifically, the space SP includes a left space SPL for accommodating at least a part of the left reinforcement part RFL and a right space SPR for accommodating at least a part of the right reinforcement part RFR. As shown in the upper diagram of Fig. 14, the left space SPL includes a part of the space located above the left sub-bundle part 12C3 of the third coil winding part 12C that is not occupied by the upper magnet 15U, and the right space SPR includes a part of the space located above the right sub-bundle part 12C4 of the third coil winding part 12C that is not occupied by the upper magnet 15U.

[0088] With this configuration, the reinforcing portion RF is disposed in the space SP without protruding beyond the contour of the coil 12 in top view. Therefore, this configuration brings about the effect that the vibration generator 101 can be made smaller without reducing the driving force.

[0089] Next, referring to FIG. 15, a bracket 11V, which is another configuration example of the bracket 11, will be described. FIG. 15 is a cross-sectional view of the base member 2, the yoke 10, the bracket 11 (bracket 11V), the coil 12, and the magnet 15. Specifically, the upper view of FIG. 15 is a cross-sectional view of each member on a virtual plane parallel to the YZ plane including the dashed line L5 in the upper view of FIG. 10, seen from the X1 side. The lower view of FIG. 15 is a cross-sectional view of the base member 2, the yoke 10, the bracket 11V, the coil 12, and the magnet 15, and corresponds to the upper view of FIG. 15. That is, the lower view of FIG. 15 corresponds to a view in which the bracket 11 in the upper view of FIG. 15 is replaced with the bracket 11V.

[0090] The bracket 11V differs from the bracket 11 having the reinforcing portion RF extending over substantially the entire length of the main body plate portion 11B in the X-axis direction in that the bracket 11V has a reinforcing portion RF extending between the two mounting plate portions 11A at both ends (left and right ends) of the main body plate portion 11B in the Y-axis direction. Specifically, in the bracket 11V, the right reinforcing portion RFR is formed so as to extend between the first mounting plate portion 11A1 and the second mounting plate portion 11A2, and the left reinforcing portion RFL is formed so as to extend between the third mounting plate portion 11A3 and the fourth mounting plate portion 11A4. That is, in the bracket 11V, no reinforcing portion is formed at the left front end portion, the left rear end portion, the right front end portion, and the right rear end portion of the main body plate portion 11B. However, the bracket 11V may have the reinforcing portion RF formed so as to extend over substantially the entire length of the main body plate portion 11B in the X-axis direction.

[0091] Bracket 11V also differs from bracket 11 in that the second bent portion FD2 and second reinforcing plate portion RP2 are omitted, and the first reinforcing plate portion RP1 extends upward close to the lower surface (ceiling surface) of upper yoke 10U.

[0092] Bracket 11V also differs from bracket 11 in that mounting plate portion 11A is formed to extend outward from main body plate portion 11B without reinforcing portion RF, in that mounting plate portion 11A is formed to extend outward from second reinforcing plate portion RP2 of reinforcing portion RF. That is, in bracket 11V, the upper surface of mounting plate portion 11A and the upper surface of main body plate portion 11B are substantially flush with each other.

[0093] Even when such a bracket 11V is provided instead of the bracket 11, the vibration generator 101 can be made smaller without reducing the driving force, as in the case of having the bracket 11. This is because at least a part of the left reinforcement part RFL is housed in the left space SPL, and at least a part of the right reinforcement part RFR is housed in the right space SPR. In addition, the bracket 11V has the advantage that it is easier to process than the bracket 11.

[0094] Next, bracket 11W, which is yet another configuration example of bracket 11, will be described with reference to Fig. 16. Fig. 16 is a perspective view of bracket 11W. Bracket 11W differs from bracket 11, which has two pedestal portions FP, in that bracket 11W has four pedestal portions FP and in that bracket 11W omits third opening H3 (see the upper diagram in Fig. 4), but is otherwise the same as bracket 11.

[0095] Specifically, in the bracket 11W, the right-side reinforcing part RFR is formed so as to extend between the first mounting plate part 11A1 and the second mounting plate part 11A2, including the parts where the first mounting plate part 11A1 and the second mounting plate part 11A2 are arranged. Similarly, the left-side reinforcing part RFL is formed so as to extend between the third mounting plate part 11A3 and the fourth mounting plate part 11A4, including the parts where the third mounting plate part 11A3 and the fourth mounting plate part 11A4 are arranged. Similarly to the reinforcing part RF in the bracket 11 (see FIG. 14), each of the reinforcing parts RF in the bracket 11 is configured to include a first bent part FD1, a first reinforcing plate part RP1, a second bent part FD2, and a second reinforcing plate part RP2.

[0096] Even when such a bracket 11W is provided instead of the bracket 11, the vibration generator 101 can be made smaller without reducing the driving force, as in the case where the vibration generator 101 has the bracket 11. This is because at least a part of the left reinforcement part RFL is accommodated in the left space SPL, and at least a part of the right reinforcement part RFR is accommodated in the right space SPR.

[0097] Next, referring to FIG. 17, a bracket 11X, which is yet another configuration example of the bracket 11, will be described. FIG. 17 is a perspective view of the bracket 11X. The bracket 11X is different from the bracket 11 in that it has reinforcing parts RF (left reinforcing part RFL and right reinforcing part RFR) that extend over the entire length in the X-axis direction of both ends (left end and right end) of the main body plate part 11B in the Y-axis direction, but is the same as the bracket 11 in other respects. Specifically, the left reinforcing part RFL is formed so as to extend over the entire length of the left edge of the main body plate part 11B in the X-axis direction, and the right reinforcing part RFR is formed so as to extend over the entire length of the right edge of the main body plate part 11B in the X-axis direction. Each of the reinforcing parts RF of the bracket 11X is configured to include a first bent part FD1, a first reinforcing plate part RP1, a second bent part FD2, and a second reinforcing plate part RP2, similar to the reinforcing part RF of the bracket 11 (see FIG. 14).

[0098] Even when such a bracket 11X is provided instead of the bracket 11, the vibration generator 101 can be made smaller without reducing the driving force, as in the case where the vibration generator 101 has the bracket 11. This is because at least a part of the left reinforcement part RFL is accommodated in the left space SPL, and at least a part of the right reinforcement part RFR is accommodated in the right space SPR.

[0099] 1 to 3, the vibration generator 101 according to an embodiment of the present disclosure includes a housing HS, a movable body (oscillating body VB) accommodated in the housing HS, a support member (elastic support member ES) that supports the movable body (oscillating body VB) so that the movable body can vibrate along a first direction (X-axis direction), a coil 12 having a main flux part MW extending along a second direction (Y-axis direction) perpendicular to the first direction (X-axis direction), and a magnetic flux generating member (magnet 15) that generates a magnetic flux passing through the main flux part MW along a third direction (Z-axis direction) perpendicular to both the first direction (X-axis direction) and the second direction (Y-axis direction). The vibration generator 101 is configured such that the coil 12 is fixed to the housing HS, and the magnetic flux generating member (magnet 15) is fixed to the movable body (oscillating body VB). The vibration generating device 101 also includes a conductive member (bracket 11) that is fixed to the coil 12, extends along a first direction (X-axis direction) so as to cross the magnetic flux, and is configured to generate eddy currents when the movable body (vibrator VB) moves along the first direction (X-axis direction) to reduce the acceleration (vibration acceleration) of the movable body (vibrator VB).

[0100] In this configuration, the magnetism generating member (magnet 15) and the conductive member (bracket 11) can generate a damping force (a force that suppresses vibration) in the same way as a gel-like damper member that generates viscous resistance. This configuration can also suppress resonance of the vibrating body VB by the damping force. In this configuration, the damping force is generated by eddy currents. Therefore, this configuration, which does not include a deforming part or a sliding part like a gel-like damper member, has the effect of improving the durability of the vibration generating device 101.

[0101] Furthermore, in a typical vibration generating device, the braking force due to eddy currents can be an undesirable force that reduces vibration acceleration, but the vibration generating device 101 according to the present disclosure is configured to actively utilize the braking force due to eddy currents to suppress resonance of the vibrating body VB.

[0102] The conductive member (bracket 11) may be made of a non-magnetic metal. This configuration can prevent a magnetic force (attraction force) from acting between the conductive member and magnet 15 as occurs when the conductive member (bracket 11) is made of a magnetic metal, and has the effect of suppressing the efficient use of the driving force by the driving means DM from being hindered by such attraction force.

[0103] Furthermore, the conductive member (bracket 11) may be made of a material with a higher electrical conductivity than iron and iron alloys. This configuration has the effect of increasing the damping force (force that suppresses vibration) caused by eddy currents. This is because the greater the electrical conductivity, the greater the damping force caused by eddy currents. Therefore, this configuration has the effect of suppressing resonance of, for example, a heavier vibrating body VB.

[0104] Moreover, the conductive member (bracket 11) may be preferably made of copper, aluminum, or an alloy thereof. This configuration has the effect of reducing material costs compared to when the conductive member is made of a precious metal such as silver or an alloy thereof.

[0105] Furthermore, the conductive member (bracket 11) may be provided between the magnetic flux generating member (magnet 15) and the coil 12. This configuration allows the conductive member (bracket 11) to be located closer to the magnetic flux generating member (magnet 15) than when the coil 12 is located between the conductive member (bracket 11) and the magnetic flux generating member (magnet 15), and thus brings about the effect of increasing the braking force (force that suppresses vibration). This is because the closer the conductive member (bracket 11) is to the magnetic flux generating member (magnet 15), the higher the magnetic flux density passing through the conductive member (bracket 11), and therefore the higher the magnetic flux density passing through the conductive member (bracket 11), the greater the braking force.

[0106] The vibration generator 101 may also include a magnetic flux attracting member that attracts magnetic flux at a position separated from the magnetic flux generating member (magnet 15) along the third direction (Z-axis direction). In this case, the conductive member (bracket 11) may be disposed between the magnetic flux generating member (magnet 15) and the magnetic flux attracting member. In the illustrated example, the magnet 15 functions as a magnetic flux generating member and a magnetic flux attracting member, and the yoke 10 functions as a magnetic flux attracting member. Specifically, when the upper magnet 15U functions as a magnetic flux generating member, the lower yoke 10D and the lower magnet 15D function as a magnetic flux attracting member. When the lower magnet 15D functions as a magnetic flux generating member, the upper yoke 10U and the upper magnet 15U function as a magnetic flux attracting member. Note that one of the upper magnet 15U and the lower magnet 15D may be omitted. When the upper magnet 15U is omitted, the lower magnet 15D functions as a magnetic flux generating member, and the upper yoke 10U functions as a magnetic flux attracting member. The same applies to the case where the lower magnet 15D is omitted. This configuration makes the angle (hereinafter referred to as the "magnetic flux angle") formed between the extension direction (X-axis or Y-axis direction) of the conductive member (bracket 11) and the direction of the magnetic flux from the magnetic flux generating member (magnet 15) toward the magnetic flux attracting member (Z-axis direction) approximately a right angle, which has the effect of making the braking force (force to suppress vibration) greater than when the magnetic flux angle is an angle other than a right angle. This is because, if the magnetic flux density is the same, the closer the magnetic flux angle is to a right angle, the greater the braking force.

[0107] For example, the magnetic flux generating member may be an upper magnet 15U serving as a first permanent magnet, and the magnetic flux attracting member may be a lower magnet 15D serving as a second permanent magnet. In this case, the first permanent magnet (upper magnet 15U) and the second permanent magnet (lower magnet 15D) may be arranged so that opposing faces have different polarities, as shown in Fig. 7. This configuration brings about the effect of further increasing the damping force (force for suppressing vibration) by making the magnetic flux angle closer to a right angle.

[0108] As shown in FIG. 4, the vibration generator 101 may include a bracket 11 having a main body plate 11B extending along a plane parallel to each of the first direction (X-axis direction) and the second direction (Y-axis direction) and having a coil 12 attached thereto, and an attachment plate 11A extending from the main body plate 11B and fixed to a housing HS. In this case, the coil 12 may be fixed to the housing HS (base member 2) via the bracket 11, and the magnetic flux generating member (magnet 15) may be fixed to the movable body (vibration body VB). The main body plate 11B may be made of copper, aluminum, or an alloy thereof and configured to function as a conductive member. This configuration has the effect of reducing the number of parts compared to a case in which a member other than the bracket 11 (main body plate 11B) functions as a conductive member.

[0109] Furthermore, the conductive member (bracket 11) may be configured not to have an opening at a position corresponding to the locus TR (see the upper diagram in FIG. 4) of the center of the magnetic flux when the movable body (vibrating body VB) vibrates. In other words, the conductive member (bracket 11) may be configured to always intersect with the magnetic flux at least in the central region CR when the movable body (vibrating body VB) is vibrating. This configuration brings about the effect that eddy currents flow more easily than when there is an opening that intersects with the locus TR.

[0110] Furthermore, the coil 12 may have an air core portion AC, which is the innermost portion of the coil winding portion, and a conductor portion CP extending outward from the air core portion AC. The conductive member (bracket 11) may have an opening (see the first opening H1 in the upper diagram of FIG. 4) that prevents interference with the conductor portion CP when the coil 12 is attached. In this case, the opening (first opening H1) may be formed at a position that avoids the locus TR. In other words, the opening (first opening H1) may be formed at a position that avoids the central region CR. This configuration brings about the effect of preventing interference between the conductor portion CP and the conductive member (bracket 11) while allowing eddy currents to flow more easily than when an opening (first opening H1) that intersects with the locus TR is provided.

[0111] The air-core portion AC may be formed in the shape of a long hole extending along the second direction (Y-axis direction) as shown in the lower diagram of FIG. 4. In this case, the conductor portion CP may be configured to extend outward from an end portion of the air-core portion AC in the second direction (Y-axis direction) as shown in the upper diagram of FIG. 4. In the example shown in the upper diagram of FIG. 4, the first conductor portion CP1 is configured to extend forward (X1 direction) from the left end portion (end portion on the Y1 side) of the air-core portion AC. This configuration brings about an effect that an opening (first opening H1) can be formed at a position away from the locus TR, compared with a case in which the first conductor portion CP1 is configured to extend outward from a portion other than the end portion of the air-core portion AC (for example, the center portion). The same applies to the second conductor portion CP2 and the third conductor portion CP3.

[0112] 1 to 3, a vibration generator 101 according to an embodiment of the present disclosure includes a housing HS, a movable body (vibrator VB) accommodated in the housing HS, a support member (elastic support member ES, leaf spring 17) that supports the movable body (vibrator VB) so that the movable body can vibrate along a first direction (X-axis direction, front-rear direction), a main body plate portion 11B extending in a second direction (Y-axis direction, left-right direction) perpendicular to the first direction (X-axis direction), and a first auxiliary support member 11B extending in a third direction (Z-axis direction, up-down direction) perpendicular to the first direction (X-axis direction) and the second direction (Y-axis direction) via a first bent portion FD1 (see FIG. 14). The bracket 11 has a reinforcing portion RF (see FIG. 14) including a strong plate portion RP1 (see FIG. 14) and is attached to the housing HS (base member 2) via the mounting plate portion 11A, a coil 12 has a main bundle wire portion MW (see FIG. 4) including a plurality of conductors extending in the second direction (Y-axis direction) and a sub bundle wire portion SW (see FIG. 4) connecting two adjacent main bundle wire portions MW and is attached to one side (Z2 side, lower side) of the main body plate portion 11B in the third direction (Z-axis direction), and a permanent magnet (magnet 15) is attached to the movable body (yoke 10) on the other side (Z1 side, upper side) of the coil 12 in the third direction (Z-axis direction) and generates a magnetic flux toward the main bundle wire portion MW. As shown in FIG. 14, one end (left end LE1) of the permanent magnet (magnet 15) in the second direction (Y-axis direction) is located on the inner side (Y2 side) of one end (left end LE2) of the sub-bundle portion SW in the second direction (Y-axis direction) by a distance DS1 (see also the central view of FIG. 7). The left end LE1 being located on the inner side (Y2 side) of the left end LE2 means that the left end LE1 is located closer to the center point of the vibrating body VB than the left end LE2. The first reinforcing plate portion RP1 is located on the inner side (Y2 side) of one end (left end LE2) of the sub-bundle portion SW in the second direction (Y-axis direction) and extends from a position (point PS1) outside one end (left end LE1) of the permanent magnet (magnet 15) in the second direction (Y-axis direction) toward the other side (Z1 side, upper side) in the third direction (Z-axis direction). The position outside the left end LE1 means a position farther from the center point of the vibrating body VB than the left end LE1. In the illustrated example, the point PS1 corresponds to the position of the inner end and the lower end of the first reinforcing plate portion RP1.

[0113] This configuration has the advantage that since at least a part of the reinforcing part RF is provided in the space SP (see FIG. 14), it is easier to achieve miniaturization compared to a configuration in which the reinforcing part is provided outside the coil. In the example shown in FIG. 14, the space SP corresponds to a part of the space (a space having the same cross section as the cross section of the coil 12 in the XY plane) located above the coil 12 that is not occupied by the upper magnet 15U. Specifically, the space SP corresponds to a part of the space located above the sub bundle part SW of the coil 12 that is not occupied by the upper magnet 15U. No permanent magnet is arranged in this space SP. This is because even if a permanent magnet is arranged, the permanent magnet cannot efficiently generate a driving force suitable for driving the vibrating body VB. Therefore, this space SP is suitable as a place for arranging at least a part of the reinforcing part RF without reducing the driving force by the driving means DM.

[0114] 14, the reinforcing portion RF may include a second reinforcing portion RP2 extending from the other end (Z1 end, upper end) of the first reinforcing portion RP1 in the third direction (Z-axis direction) toward the outside (Y1 side, left side) in the second direction (Y-axis direction) via a second bent portion FD2. That is, the reinforcing portion RF may have a structure formed by so-called Z bending.

[0115] This structure brings about the effect of further increasing the strength of the bracket 11, as compared to a reinforcing portion RF having a portion that does not include the second reinforcing plate portion RP2 as shown in the lower diagram of FIG.

[0116] As shown in FIG. 14, the mounting plate portion 11A may extend outward (in the Y1 direction) from the outer end (left end LE3) of the second reinforcing plate portion RP2.

[0117] This configuration has the advantage that deformation of main body plate portion 11B can be more reliably suppressed compared to a configuration in which mounting plate portion 11A extends from main body plate portion 11B as shown in the lower diagram of FIG.

[0118] 13, the bracket 11 may be formed of a metal plate having a material grain such as roll grain RM. In this case, the reinforcing portion RF may be configured to include a first bent portion FD1 formed so that a bend line FL extends along a direction (X-axis direction) intersecting with the direction (Y-axis direction) of the material grain (roll grain RM). In other words, the reinforcing portion RF may be configured so that the first bent portion is not formed so that the bend line extends along a direction (Y-axis direction) parallel to the direction (Y-axis direction) of the material grain (roll grain RM). The bend line FL is a line formed by bending the metal plate to form the first bent portion FD1.

[0119] This configuration has the effect of making it easier for the bracket 11 to withstand loads from various directions.

[0120] Furthermore, bracket 11 may be formed of a metal (e.g., copper, aluminum, silver, or an alloy thereof) having higher electrical conductivity and lower strength than the material (e.g., austenitic stainless steel) constituting housing HS. In this case, bracket 11 may be configured to reduce the acceleration of the movable body (oscillating body VB) by generating an eddy current to cancel out a change in magnetic flux when a permanent magnet (magnet 15) attached to the movable body (yoke 10) moves along the first direction (X-axis direction).

[0121] This configuration has the advantage that it is possible to realize bracket 11 made of a material that easily generates eddy currents.

[0122] The preferred embodiments of the present invention have been described above in detail. However, the present invention is not limited to the above-described embodiments. Various modifications or substitutions may be applied to the above-described embodiments without departing from the scope of the present invention. Furthermore, each of the features described with reference to the above-described embodiments may be appropriately combined as long as there is no technical contradiction.

[0123] For example, in the above embodiment, the vibration generator 101 is configured to include the magnet 15 magnetized with eight poles and the coil 12 having three coil winding parts (six bundle parts), but it may be configured to include the magnet 15 magnetized with a number of magnetic poles other than eight, such as two, four, six, ten or twelve poles, and the coil 12 having the corresponding number of bundle parts. In other words, the coil 12 may be configured to have one, two, four or more coil winding parts.

[0124] In the above embodiment, the bracket 11 has a right side reinforcement part RFR and a left side reinforcement part RFL, but one of the right side reinforcement part RFR and the left side reinforcement part RFL may be omitted. Alternatively, the bracket 11 may have a front side reinforcement part formed at the front end of the main body plate part 11B, or a rear side reinforcement part formed at the rear end of the main body plate part 11B. In this case, at least one of the right side reinforcement part RFR, the left side reinforcement part RFL, the front side reinforcement part, and the rear side reinforcement part may be omitted.

[0125] In the above embodiment, the left side reinforcement part RFL is formed so as to extend over substantially the entire length of the left side edge of the main body plate part 11B in the X-axis direction, but it may be formed so as to extend along part of the left side edge of the main body plate part 11B. Also, the left side reinforcement part RFL may be formed so as to extend along multiple parts of the left side edge of the main body plate part 11B. The same applies to the right side reinforcement part RFR, the front reinforcement part, and the rear reinforcement part. [Explanation of symbols]

[0126] REFERENCE SIGNS LIST 1 Cover member 1A Outer peripheral wall portion 1A1 First side plate portion 1A2 Second side plate portion 1A3 Third side plate portion 1A4 Fourth side plate portion 1T Top plate portion 2 Base member 2B Bottom plate portion 2P Support portion 2P1 First support portion 2P2 Second support portion 2P3 Third support portion 2P4 Fourth support portion 10 Yoke 10D Lower yoke 10U Upper yoke 11 Bracket 11A Mounting plate portion 11A1 First mounting plate portion 11A2 Second mounting plate portion 11A3 Third mounting plate portion 11A4 Fourth mounting plate portion 11B Main body plate portion 11V, 11W, 11X Bracket 12 Coil 12A First coil winding portion 12A1 Front main bundle portion 12A2 Rear main bundle portion 12A3 Left side sub-bundle portion 12A4 Right side sub-bundle portion 12B Second coil winding portion 12B1 Front main bundle portion 12B2 Rear main bundle portion 12B3 Left side sub-bundle portion 12B4 Right side sub-bundle portion 12C Third coil winding portion 12C1 Front main bundle portion 12C2 Rear main bundle portion 12C3 Left side sub-bundle portion 12C4 Right side sub-bundle portion 12E Second end portion 12S...First end 13...Wiring board 13L...Left side wiring board 13R...Right side wiring board 15...Magnet 15D...Lower magnet 15D1...First lower magnet part 15D2...Second lower magnet part 15D3...Third lower magnet part 15D4... Fourth lower magnet part 15U... Upper magnet 15U1... First upper magnet part 15U2... Second upper magnet part 15U3... Third upper magnet part 15U4... Fourth upper magnet part 17... Leaf spring 17A... Connection part 17A1... First connection part 17A2...2nd connection part 17A3...3rd connection part 17A4...4th connection part 17B...Vibrator support section 17C...Elastic arm section 17C1...First elastic arm section 17C2...Second elastic arm section 17C3...Third elastic arm section 17C4...Fourth elastic arm section 101...Vibration generator AC...Air core section BW...Bottom plate section CP...Conductor section CP1...First conductive section CP2...Second conductive section CP3...Third conductive section CP4...Fourth conductive section CR...Central region CTR...Control sectionDM...Drive means EP...Upright part ES...Elastic support member FD1...First bent part FD2...Second bent part FL...Bending line FP...Pedestal part FPL...Left side pedestal part FPR...Right side pedestal part GP...Gap H1...First opening H2...Second opening H3...Third opening HS...Housing LE1, LE2, LE3...Left end LW...Left side plate part MF...Magnetic field line MF1...First magnetic field line MF2...Second magnetic field line MF3...Third magnetic field line MF4...Fourth magnetic field line MF5...Fifth magnetic field line MF6...Sixth magnetic field line MW...Main flux part NV...Non-vibrating body PE...Outer conductor pattern PI...Inner conductor pattern PR...Convex part PS1...Point RC...Concave part RF...Reinforcement part RFL...Left side reinforcement part RFR...Right side reinforcement part RM...Roll eye RP1...1st reinforcing plate part RP2...2nd reinforcing plate part RW...Right side plate part SP...Space SPL...Left side space SPR...Right side space SW...Sub-bundle part TR...Trajectory TW...Top plate VA...Vibration axis B...Vibration body VE...Vibration device VP...Vibration section

Claims

1. Housing and A movable body accommodated in the housing; a support member that supports the movable body so that the movable body can vibrate along a first direction; a bracket having a reinforcing portion including a main body plate portion extending in a second direction perpendicular to the first direction and a first reinforcing plate portion extending from one end of the main body plate portion in the second direction via a first bent portion in a third direction perpendicular to the first direction and the second direction, the bracket being attached to the housing via an attachment plate portion; a coil having a main bundle portion including a plurality of conductors extending in the second direction and a sub bundle portion connecting two adjacent main bundle portions, the coil being attached to one side of the main body plate portion in the third direction; a permanent magnet attached to the movable body on the other side of the coil in the third direction and generating a magnetic flux directed toward the main flux portion, one end of the permanent magnet in the second direction is located inside one end of the sub flux portion in the second direction, The vibration generating device is characterized in that the first reinforcing plate portion is located inside one end of the secondary bundle portion in the second direction and extends from a position outside one end of the permanent magnet in the second direction toward the other side in the third direction.

2. The reinforcing portion includes a second reinforcing plate portion extending from the other end of the first reinforcing plate portion in the third direction toward an outer side in the second direction via a second bent portion. The vibration generating device according to claim 1 .

3. The mounting plate portion extends outward from the outer end of the second reinforcing plate portion. The vibration generating device according to claim 2 .

4. The bracket is formed of a metal plate having a material grain, The reinforcing portion includes the first bent portion formed such that a bend line extends along a direction intersecting the direction of the material grain, The first bend is not formed so that a bend line extends along a direction parallel to the grain direction of the material. The vibration generating device according to claim 1 .

5. The bracket is formed of a metal having a higher electrical conductivity and a lower strength than the material constituting the housing, and is configured to generate an eddy current so as to cancel the change in the magnetic flux when the permanent magnet attached to the movable body moves along the first direction, thereby reducing the acceleration of the movable body. The vibration generating device according to claim 1 .

6. the housing is formed of stainless steel; The bracket is made of copper or a copper alloy. The vibration generating device according to claim 5 .

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