Vibration generating device

Abstract

A vibration generating device (101) is provided with: a housing (HS); a vibrating body (VB) housed in the housing (HS); an elastic support member (ES) that supports the vibrating body (VB) so as to be capable of vibrating in the X-axis direction; a coil (12) having a bunching portion extending in the Y-axis direction; and a magnet (15) that generates a magnetic flux that passes through the bunching part in the Z-axis direction. The vibration generating device (101) is configured such that the coil (12) is fixed to the housing (HS) and the magnet (15) is fixed to the vibrating body (VB). Furthermore, the vibration generating device (101) is provided with a bracket (11) as a conductive member, the bracket (11) being configured so as to be fixed to the coil (12), extending in the X-axis direction so as to traverse the magnetic flux, and generating an eddy current to reduce the acceleration of the vibrating body (VB) when the vibrating body (VB) moves in the X-axis direction.

Description

Technical Field

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

[0002] Conventionally, there is known an actuator (vibration generating device) that generates vibration (see Patent Document 1). The actuator is configured to vibrate a movable body relative to a supporting body by a magnetic drive circuit having a coil and a magnet. In addition, the actuator is configured to suppress the resonance of the movable body by using a viscoelastic member as a gel-like vibration damper member disposed between the supporting body and the movable body.

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent Application Publication No. 2019-013086 Summary of the invention

[0006] Problems to be solved by the invention

[0007] However, the above-mentioned viscoelastic member has a problem in terms of durability.

[0008] Therefore, it is desirable to provide a vibration generating device with greater durability.

[0009] Means used to solve problems

[0010] A vibration generating device according to an embodiment of the present disclosure is characterized in that it comprises: a shell; a movable body accommodated in the shell; a supporting component supporting the movable body so as to be able to vibrate along a first direction; a coil having a wire bundle portion extending along a second direction perpendicular to the first direction; and a magnetic flux generating component generating a magnetic flux passing through the wire bundle portion along a third direction perpendicular to the first direction and the second direction, wherein one side of the coil and the magnetic flux generating component is fixed relative to the shell, and the other side of the coil and the magnetic flux generating component is fixed relative to the movable body, and the vibration generating device comprises a conductive component, which is fixed relative to the coil and extends along the first direction in a manner transverse to the magnetic flux, and generates eddy current when the movable body moves along the first direction to reduce the acceleration of the movable body.

[0011] Effects of the Invention

[0012] Through the above means, a more durable vibration generating device is provided. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a three-dimensional diagram of a vibration generating device.

[0014] Figure 2 It is an exploded perspective view of the vibration generating device.

[0015] Figure 3 This is an exploded perspective view of the vibrating part and the non-vibrating body.

[0016] Figure 4 It is a three-dimensional diagram of a non-vibrating body.

[0017] Figure 5 It is a diagram showing a configuration example of a base member and an elastic supporting member.

[0018] Figure 6 It is a three-dimensional diagram of the vibration part.

[0019] Figure 7 It is a three-dimensional diagram of the components of the drive mechanism.

[0020] Figure 8 It is a three-dimensional diagram of a leaf spring.

[0021] Fig. 9 It is a three-dimensional view of the base component and the bracket.

[0022] Fig.10 is a cross-sectional view of a vibrating body.

[0023] Fig.11 It is a three-dimensional diagram of the components constituting the vibration generating device.

[0024] Fig.12 It is a three-dimensional diagram of the components constituting the vibration generating device.

[0025] Fig.13 It is a graph showing the relationship between the driving frequency of the vibrating body and the vibration acceleration. DETAILED DESCRIPTION

[0026] Hereinafter, a vibration device VE including the vibration generating device 101 according to an embodiment of the present disclosure will be described with reference to the drawings. Figure 1 1 is a perspective view of a vibration device VE including a vibration generating device 101 and a control unit CTR. Specifically, Figure 1 The above figure is a three-dimensional diagram of the vibration generating device 101 connected to the control unit CTR. Figure 1 The lower figure is a perspective view of the vibration generating device 101 with the cover member 1 removed. Figure 2 It is an exploded perspective view of the vibration generating device 101 .

[0027] Figure 1 and Figure 2In each of the above, X1 represents one direction of the X-axis constituting the three-dimensional orthogonal coordinate system, and X2 represents the other direction of the X-axis. In addition, 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 the present embodiment, the X1 side of the vibration generating device 101 is equivalent to the front side (front side) of the vibration generating device 101, and the X2 side of the vibration generating device 101 is equivalent to the rear side (back side) of the vibration generating device 101. In addition, the Y1 side of the vibration generating device 101 is equivalent to the left side of the vibration generating device 101, and the Y2 side of the vibration generating device 101 is equivalent to the right side of the vibration generating device 101. Moreover, the Z1 side of the vibration generating device 101 is equivalent to the upper side of the vibration generating device 101, and the Z2 side of the vibration generating device 101 is equivalent to the lower side of the vibration generating device 101. The same is true in other figures.

[0028] The vibration device VE includes a control unit CTR and a vibration generator 101. The vibration generator 101 includes a housing HS and a vibration unit VP accommodated in the housing HS.

[0029] like Figure 1 As shown in FIG. 1 , the housing HS has a substantially rectangular parallelepiped shape. In the present embodiment, the housing HS is formed of a non-magnetic material such as austenitic stainless steel. The housing HS is composed of a cover member 1 and a base member 2 .

[0030] like Figure 2 As shown, the cover member 1 is configured to form the side surface and the upper surface of the housing HS, and the base member 2 is configured to form the bottom surface of the housing HS. In the example shown in the figure, the base member 2 is configured to function as a base for supporting the vibration part VP.

[0031] In the present embodiment, the cover member 1 includes a substantially rectangular cylindrical outer wall portion 1A and a flat plate-shaped top plate portion 1T provided so as to be continuous with the upper end (end on the Z1 side) of the outer wall portion 1A.

[0032] The outer peripheral wall portion 1A includes four side plate portions formed in a flat plate shape. Figure 2 As shown, the outer peripheral wall portion 1A includes a first side plate portion 1A1 and a third side plate portion 1A3 facing each other, and a second side plate portion 1A2 and a fourth side plate portion 1A4 which are perpendicular to the first side plate portion 1A1 and the third side plate portion 1A3 and facing each other.

[0033] The control unit CTR is configured to realize the operation of the vibration unit VP. In the present embodiment, the control unit CTR includes an electronic circuit configured to supply an alternating current to the vibration unit VP for vibrating the vibration unit VP. In addition, in the present embodiment, the control unit CTR is disposed outside the housing HS, but may also be disposed inside the housing HS. In this case, the control unit CTR may also be one of the components of the vibration generating device 101.

[0034] The vibration part VP is configured to be able to vibrate the housing HS by its own vibration. In the present embodiment, the vibration part VP is configured to be attached to the housing HS and vibrate the housing HS.

[0035] Next, refer to Figure 3 , the details of the vibration part VP are described. Figure 3 2 is an exploded perspective view of the vibration part VP. The vibration part VP is configured to include a vibration body VB, a drive mechanism DM, and an elastic support member ES.

[0036] The vibrating body VB as a movable body has a predetermined natural frequency and is configured to be able to move along a vibration axis VA extending in a predetermined direction (see Figure 2 ) vibrates relative to the housing HS. In the present embodiment, the vibrating body VB has a predetermined natural vibration frequency and is configured to be able to vibrate along a vibration axis VA (refer to Figure 2 ) vibrates relative to the base member 2.

[0037] The drive mechanism 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 present embodiment, the drive mechanism DM is configured to vibrate the vibrating body VB elastically supported by the elastic supporting member ES along the vibration axis VA according to the AC current supplied by the control unit CTR.

[0038] The elastic supporting member ES is an example of a supporting 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.

[0039] Specifically, the vibration part VP including the vibration body VB, the driving mechanism DM and the elastic support member ES is composed of the yoke 10, the bracket 11, the coil 12, the wiring substrate 13, the magnet 15 and the leaf spring 17. Moreover, the vibration body VB is composed of the yoke 10 and the magnet 15, the driving mechanism DM is composed of the coil 12 and the magnet 15, and the elastic support member ES is composed of the leaf spring 17. In addition, the bracket 11, the coil 12 and the wiring substrate 13 constitute a non-vibrating body NV that does not vibrate together with the vibration body VB. The non-vibrating body NV vibrates together with the housing HS, but does not vibrate together with the vibration body VB.

[0040] The yoke 10 is a component constituting a magnetic circuit. In the embodiment, the yoke 10 is formed of a magnetic material including iron and the like. In the illustrated example, the yoke 10 is composed of two components, an upper yoke 10U and a lower yoke 10D, and is formed of a cold-rolled steel sheet (SPCC). The upper yoke 10U is a component constituting 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 end surface on the Z2 side of each of the left plate portion LW and the right plate portion RW, and the convex portion PR can mesh with a concave portion RC formed on the lower yoke 10D. The lower yoke 10D is a component constituting the lower surface of the vibrating body VB, and includes a bottom plate portion BW. Specifically, a concave portion RC is formed on the end surface on the Y1 side (left side) and the end surface on the Y2 side (right side) of the lower yoke 10D, respectively, and the concave portion RC meshes with the convex portion PR formed on the upper yoke 10U.

[0041] 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 and the magnet 15 are placed opposite to each other in a non-contact manner. That is, the bracket 11 is configured to function as a coil holder that supports the coil 12. In addition, the bracket 11 is fixed to the base member 2 in a manner that does not contact the vibrating body VB. In the present 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 a connecting portion 11A and a plate-shaped portion 11B. Specifically, even when the vibrating body VB vibrates, the bracket 11 is fixed to the base member 2 by fastening components, welding, bonding, or riveting, etc., at a position where the bracket 11 and the coil 12 are not in contact with the vibrating body VB, via four connecting portions 11A protruding outward from the plate-shaped portion 11B. That is, the bracket 11 on which the coil 12 is mounted is configured not to vibrate together with the vibrating body VB.

[0042] The coil 12 is configured to generate a magnetic field when supplied with electric current. Figure 3 In the example shown, the coil 12 includes three coil winding portions (a first coil winding portion 12A, a second coil winding portion 12B, and a third coil winding portion 12C) connected in series. The first coil winding portion 12A, the second coil winding portion 12B, and the third coil winding portion 12C each have a substantially elliptical shape (a rounded rectangle) having a major axis along the Y-axis direction. Furthermore, the coil 12 has a first end portion 12S on the winding start side and a second end portion 12E on the winding end side. In addition, the coil 12 is fixed to the surface on the Z2 side (lower side) of the bracket 11 by an adhesive or the like. The surface of the conductive wire (a wire material formed of copper or a copper alloy, etc.) constituting the coil 12 is insulatingly coated. Figure 3 In the figure, for the sake of clarity, the coil 12 is shown in a simplified state, and the detailed winding state is omitted. The same is true in other figures.

[0043] The wiring substrate 13 is a component connected to the first end 12S and the second end 12E of the coil 12. Figure 4 As shown in the lower figure, the wiring substrate 13 is fixed to the Z2 side (lower side) surface of the bracket 11 by an adhesive. Figure 4 is a three-dimensional diagram of a non-vibrating body NV. Specifically, Figure 4 The above picture is a stereoscopic picture of the non-vibrating body NV from above. Figure 4 The figure below is a stereoscopic view of the non-vibrating body NV from below.

[0044] In the example shown in the figure, the wiring substrate 13 is a flexible wiring substrate having flexibility, and includes a left wiring substrate 13L and a right wiring substrate 13R. The left wiring substrate 13L and the right wiring substrate 13R are fixed to the end portion of the X1 side (front side) of the bracket 11 by adhesive or the like. Figure 4 As shown in the following figure, the first end 12S of the coil 12 is connected to the inner conductor pattern PI of the right wiring substrate 13R by solder or conductive adhesive, and the second end 12E of the coil 12 is connected to the inner conductor pattern PI of the left wiring substrate 13L by solder or conductive adhesive. In addition, the outer conductor pattern PE of the left wiring substrate 13L and the right wiring substrate 13R is connected to the wire from the control unit CTR by solder or conductive adhesive.

[0045] The first coil winding portion 12A, the second coil winding portion 12B and the third coil winding portion 12C respectively have an air core portion AC. Moreover, 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 wire portion CP. Specifically, the wire portion CP includes a first wire portion CP1 to a fourth wire portion CP4. Moreover, the first end portion 12S is connected to the first coil winding portion 12A by the first wire portion CP1, the first coil winding portion 12A is connected to the second coil winding portion 12B by the second wire portion CP2, the second coil winding portion 12B is connected to the third coil winding portion 12C by the third wire portion CP3, and the third coil winding portion 12C is connected to the second end portion 12E by the fourth wire portion CP4.

[0046] In addition, the coil 12 includes a harness portion extending along the Y-axis direction. Specifically, the first coil winding portion 12A includes a front harness portion 12A1 and a rear harness portion 12A2, the second coil winding portion 12B includes a front harness portion 12B1 and a rear harness portion 12B2, and the third coil winding portion 12C includes a front harness portion 12C1 and a rear harness portion 12C2. Figure 4 In the following figure, a dot pattern is added to the wire harness portion of the coil 12 for clarity.

[0047] The magnet 15 is an example of a magnetic flux generating component, and together with the coil 12, constitutes the driving mechanism DM. In the present embodiment, the magnet 15 includes an upper magnet 15U and a lower magnet 15D. The upper magnet 15U and the lower magnet 15D are respectively 8-pole magnetized permanent magnets having a substantially rectangular shape. Specifically, the upper magnet 15U includes a first upper magnet portion 15U1 to a fourth upper magnet portion 15U4, and the lower magnet 15D includes a first lower magnet portion 15D1 to a fourth lower magnet portion 15D4. 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 respectively include an N-pole portion and an S-pole portion. In the example shown in the figure, the upper 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 each N-pole, and the upper 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 each S-pole. Figure 3 In the figure, for the sake of clarity, a dot pattern is added to the N pole of the permanent magnet with 8 poles, and a cross pattern is added to the S pole. The same is true in other figures. The upper magnet 15U and the lower magnet 15D can be a combination of four permanent magnets with 2 poles magnetization or a combination of two permanent magnets with 4 poles magnetization.

[0048] The leaf spring 17 is an example of an elastic support member ES, which is configured to be sandwiched between the housing HS and the vibrating body VB and can elastically support the vibrating body VB. In this embodiment, the leaf spring 17 is formed of a non-magnetic material such as austenitic stainless steel. Figure 3 As shown, it has a connecting portion 17A, a vibrating body supporting portion 17B and an elastic arm portion 17C.

[0049] Specifically, the leaf spring 17 is formed by, for example, stamping and bending a metal plate made of austenitic stainless steel having a thickness of 0.2 mm. Figure 5 As shown, 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 in a state where the vibration body support portion 17B and the elastic arm portion 17C are not in contact with the base member 2 and a gap GP is formed between the bottom plate portion 2B of the base member 2 and the vibration body support portion 17B.

[0050] Figure 5 1 is a diagram showing a configuration example of the base member 2 and the elastic support member ES (leaf spring 17). Specifically, Figure 5 The upper figure is a perspective view of the base member 2 to which the elastic supporting member ES (leaf spring 17) is mounted. Figure 5 The figure below is a front view of the base member 2 with the elastic support member ES (leaf spring 17) installed, which is equivalent to Figure 5 The enlarged view of the range R1 surrounded by the dotted line in the above figure. Figure 5 In the figure, for the sake of clarity, a dot pattern is added to the elastic supporting member ES (leaf spring 17).

[0051] In this embodiment, if Figure 5 As shown in the above figure, the connection portion 17A of the leaf spring 17 includes first to fourth connection portions 17A1 to 17A4, and the elastic arm portion 17C of the leaf spring 17 includes first to fourth elastic arm portions 17C1 to 17C4.

[0052] Moreover, if Figure 5 As shown in the above figure, the first connecting portion 17A1 to the fourth connecting portion 17A4 are fixed to the bottom plate portion 2B of the base member 2 by welding. Figure 6 As shown, the vibrator VB is welded to the vibrator support portion 17B of the leaf spring 17 . Figure 6 is a three-dimensional diagram of the vibration part VP. Specifically, Figure 6 The upper figure is a three-dimensional view of the vibrating portion VP (elastic supporting member ES and vibrating body VB) in a state where the non-vibrating body NV (bracket 11, coil 12 and wiring substrate 13) is omitted from the illustration. Figure 6 The figure below is a three-dimensional diagram of the vibration part VP showing the state of the non-vibrating body NV. Figure 6 In the figure below, for the sake of clarity, a dot pattern is added to the vibrating part (vibrating body VB and elastic support member ES). The presence or absence of the dot pattern indicates that the non-vibrating body NV without the dot pattern is fixed to the base member 2 in a manner that does not contact the vibrating body VB with the dot pattern. Figure 6 (not shown in the figure below). In addition, Figure 1 The lower figure shows the non-vibrating body NV fixed to the base member 2 in a non-contact manner with the vibrating body VB.

[0053] Specifically, if Figure 6 As shown in the above figure, the vibrating body VB is composed of an upper yoke 10U, an upper magnet 15U, a lower magnet 15D and a lower yoke 10D. Furthermore, the surface on the Z2 side (lower side) of the bottom plate portion BW of the lower yoke 10D is welded to the surface on the Z1 side (upper side) of the vibrating body support portion 17B of the leaf spring 17.

[0054] exist Figure 6 In the state shown in the figure below, when an alternating current is applied to the coil 12 via the wiring substrate 13, the vibrating body VB vibrates along the vibration axis VA.

[0055] Here, refer to Figure 7, the positional relationship of the components of the drive mechanism DM when the vibrating body VB vibrates along the vibration axis VA will be described. Figure 7 DM is a three-dimensional diagram of the components of the drive mechanism DM. Specifically, Figure 7 The upper figure shows the positional relationship between the non-vibrating body NV (coil 12) and the vibrating body VB (magnet 15) when the current flows in one direction of the coil 12 and the vibrating body VB (magnet 15) moves to the X2 side (rear side). Figure 7 The central diagram of FIG. 1 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 . Figure 7 The figure below shows the positional relationship between the non-vibrating body NV (coil 12) and the vibrating body VB (magnet 15) when the current flows in the other direction of the coil 12 and the vibrating body VB (magnet 15) moves to the X1 side (front side).

[0056] When no current flows in the coil 12, since the coil 12 does not generate a magnetic field, neither repulsion nor attraction occurs between the coil 12 and the magnet 15. Figure 7 As shown in the central figure, the magnet 15 is positioned in the neutral position in such a way that its center is relative to the center of the coil 12 (the second coil winding portion 12B). 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.

[0057] When current flows from the first end 12S of the coil 12 toward the second end 12E, the first coil winding portion 12A generates a magnetic field in a manner that the Z1 side becomes the N pole and the Z2 side becomes the S pole, the second coil winding portion 12B generates a magnetic field in a manner that the Z2 side becomes the N pole and the Z1 side becomes the S pole, and the third coil winding portion 12C generates a magnetic field in a manner that the Z1 side becomes the N pole and the Z2 side becomes the S pole. As a result, the N-pole portion of the second upper magnet portion 15U2 is away from the first coil winding portion 12A and is pulled closer to the second coil winding portion 12B, the S-pole portion of the third upper magnet portion 15U3 is away from the second coil winding portion 12B and is pulled closer to the third coil winding portion 12C, the S-pole portion of the second lower magnet portion 15D2 is away from the first coil winding portion 12A and is pulled closer to the second coil winding portion 12B, and the N-pole portion of the third lower magnet portion 15D3 is away from the second coil winding portion 12B and is pulled closer to the third coil winding portion 12C, thereby, the vibrating body VB (magnet 15) is as follows: Figure 7 As shown by arrow AR1 in the upper figure, it moves toward the X2 side (rear side).

[0058] On the contrary, when the current flows from the second end 12E of the coil 12 toward the first end 12S, the first coil winding portion 12A generates a magnetic field in a manner that the Z1 side becomes the S pole and the Z2 side becomes the N pole, the second coil winding portion 12B generates a magnetic field in a manner that the Z2 side becomes the S pole and the Z1 side becomes the N pole, and the third coil winding portion 12C generates a magnetic field in a manner that the Z1 side becomes the S pole and the Z2 side becomes the N pole. As a result, the N-pole portion of the second upper magnet portion 15U2 is away from the second coil winding portion 12B and is pulled closer to the first coil winding portion 12A, the S-pole portion of the third upper magnet portion 15U3 is away from the third coil winding portion 12C and is pulled closer to the second coil winding portion 12B, the S-pole portion of the second lower magnet portion 15D2 is away from the second coil winding portion 12B and is pulled closer to the first coil winding portion 12A, and the N-pole portion of the third lower magnet portion 15D3 is away from the third coil winding portion 12C and is pulled closer to the second coil winding portion 12B, thereby, the vibrating body VB (magnet 15) is as follows: Figure 7 As shown by arrow AR2 in the figure below, it moves toward the X1 side (front side).

[0059] The control unit CTR can alternately reverse the direction of the current flowing through the coil 12 to alternately reverse the direction of the magnetic field generated by the coil 12 , thereby causing the vibrating body VB (magnet 15 ) to vibrate along the vibration axis VA (X-axis direction).

[0060] Next, refer to Figure 8 , the operation of the elastic arm portion 17C when the vibrating body VB vibrates will be described. Figure 8 1 is a perspective view of the leaf spring 17. Specifically, Figure 8 The upper figure shows the state of the leaf spring 17 when no current flows in the coil 12, that is, when the vibrating body VB is in a neutral position (not vibrating). Figure 8 The lower figure shows the state of the leaf spring 17 when the vibrating body VB moves to the X2 side (rear side).

[0061] like Figure 8 As shown in the above figure, the elastic arm portion 17C is provided between the connecting portion 17A and the vibrating body supporting portion 17B. Specifically, the first elastic arm portion 17C1 is provided between the first connecting portion 17A1 and the vibrating body supporting portion 17B, the second elastic arm portion 17C2 is provided between the second connecting portion 17A2 and the vibrating body supporting portion 17B, the third elastic arm portion 17C3 is provided between the third connecting portion 17A3 and the vibrating body supporting portion 17B, and the fourth elastic arm portion 17C4 is provided between the fourth connecting portion 17A4 and the vibrating body supporting portion 17B.

[0062] When the vibrating body VB ( Figure 8 When the elastic arm portion 17C moves in the direction indicated by the arrow AR3 (not shown in the figure), the elastic arm portion 17C Figure 8As shown in the figure below, the vibration body VB can be moved in the X2 direction. Figure 8 In the figure, for the sake of clarity, a dot pattern is added to the portion of the elastic arm portion 17C where the deflection is relatively large.

[0063] On the contrary, when the vibrating body VB is moved in the direction (X1 direction) opposite to the direction (X2 direction) indicated by the arrow AR3 by the driving mechanism DM, the elastic arm portion 17C moves in the direction opposite to the direction indicated by the arrow AR3. Figure 8 Bending in the direction opposite to the bending direction shown in the figure below can cause the vibrating body VB to translate in the direction of X1.

[0064] Here, refer again Figure 3 , the details of the upper yoke 10U are described. The upper yoke 10U has a top plate portion TW, a right plate portion RW, and a left plate portion LW. Specifically, a 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 a 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 convex portion PR is formed at the lower end of each of the left plate portion LW and the right plate portion RW, and the convex portion PR is engaged with a concave portion RC formed in the lower yoke 10D. Figure 6 The upper figure shows a state where the concave portion RC formed in the lower yoke 10D and the convex portion PR of the upper yoke 10U are engaged with each other.

[0065] When assembling the vibrating body VB, the top plate portion TW (see Figure 3 ) The upper magnet 15U is mounted on the bottom plate portion BW of the lower yoke 10D (see Figure 3 ) The lower magnet 15D is installed, and the protrusion PR of the upper yoke 10U is engaged with the recess RC of the lower yoke 10D. In this way, in the present embodiment, the vibrating body VB sets the upper yoke 10U and the lower yoke 10D surrounding the magnet 15 as different components to simplify assembly.

[0066] In addition, if Figure 6 As shown in the figure above, the surface on the Z1 side (upper side) of the upper magnet 15U is magnetically bonded to the surface on the Z2 side (lower side) of the top plate portion TW of the upper yoke 10U, and the surface on the Z2 side (lower side) of the lower magnet 15D is magnetically bonded to the surface on the Z1 side (upper side) of the bottom plate portion BW of the lower yoke 10D. In addition, in the space surrounded by the upper yoke 10U and the lower yoke 10D, as shown in FIG. Figure 6 As shown in the lower figure, the coil 12 fixed to the bracket 11 in a non-contact state with the upper magnet 15U and the lower magnet 15D is provided on the Z2 side of the upper magnet 15U and on the Z1 side of the lower magnet 15D.

[0067] like Fig. 9As shown, the bracket 11 is attached to the base member 2 by engaging a connecting portion 11A provided on the bracket 11 with a supporting portion 2P provided on the base member 2 . Fig. 9 1 is a diagram showing a configuration example of the base member 2 and the bracket 11. Specifically, Fig. 9 The above figure is a three-dimensional diagram of the bracket 11. Fig. 9 The central figure is a three-dimensional view of the base member 2. Fig. 9 The lower figure is a three-dimensional view of the bracket 11 installed on the base member 2.

[0068] like Fig. 9 As shown, the connecting portion 11A includes a first connecting portion 11A1 to a fourth connecting portion 11A4. In addition, the supporting portion 2P includes a first supporting portion 2P1 to a fourth supporting portion 2P4. Moreover, the first connecting portion 11A1 is engaged with the first supporting portion 2P1, the second connecting portion 11A2 is engaged with the second supporting portion 2P2, the third connecting portion 11A3 is engaged with the third supporting portion 2P3, and the fourth connecting portion 11A4 is engaged with the fourth supporting portion 2P4. In the example shown in the figure, the connecting portion 11A and the supporting portion 2P are joined by welding. However, the connecting portion 11A and the supporting portion 2P may also be joined by a fastening member, an adhesive, or riveting.

[0069] Next, refer to Fig.10 , the magnetic flux generated by the magnet 15 is described. Fig.10 is a cross-sectional view of the vibrating body VB. Specifically, Fig.10 The vibrating body VB composed of the upper yoke 10U, the upper magnet 15U, the lower magnet 15D and the lower yoke 10D is shown, and the coil 12 is provided inside the space surrounded by the upper yoke 10U and the lower yoke 10D (the space sandwiched between the upper magnet 15U and the lower magnet 15D). Fig.10 The dotted lines of magnetic force MF represent the magnetic flux. Fig.10 In the example shown, the magnetic force lines MF include first to sixth magnetic force lines MF1 to MF6.

[0070] Specifically, in a state where no current flows in the coil 12, the first magnetic force line MF1 comes out from the N-pole portion of the first lower magnet portion 15D1 of the lower magnet 15D, passes through the front wiring 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 force line MF2 comes out from the N-pole portion of the second upper magnet portion 15U2 of the upper magnet 15U, passes through the rear wiring 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 force line MF3 comes out from the N-pole portion of the second upper magnet portion 15U2 of the upper magnet 15U, passes through the front wiring 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 force line MF4 comes out from the N-pole portion of the third lower magnet portion 15D3 of the lower magnet 15D, passes through the rear harness 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 force line MF5 comes out from the N-pole portion of the third lower magnet portion 15D3 of the lower magnet 15D, passes through the front harness 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 force line MF6 comes out from the N-pole portion of the fourth upper magnet portion 15U4 of the upper magnet 15U, passes through the rear harness 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.

[0071] Therefore, in the space surrounded by the upper yoke 10U and the lower yoke 10D, the magnetic lines of force are concentrated in the partial space between the upper magnet 15U and the lower magnet 15D, the magnetic flux density becomes high, and the coil 12 is set in this partial space. Therefore, this structure can efficiently generate the Lorentz force by passing the current between the first end 12S and the second end 12E of the coil 12, and can make the vibrator VB vibrate efficiently along the X-axis direction.

[0072] For example, when current flows from the first end 12S toward the second end 12E of the coil 12, the vibrating body VB moves toward the X2 side (rear side). In addition, when current flows from the second end 12E toward the first end 12S of the coil 12, the vibrating body VB moves toward the X1 side (front side). Therefore, the control unit CTR can make the vibrating body VB vibrate along the vibration axis VA by passing current in a manner that alternately reverses the direction of the current flowing through the coil 12. In addition, the bracket 11 on which the coil 12 is mounted is fixed to the base member 2, but not to the vibrating body VB, so the bracket 11 and the coil 12 do not vibrate together with the vibrating body VB.

[0073] In addition, 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, which is a conductive component located 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, eddy current flows in the plate-like portion 11B of the bracket 11. In addition, in the example shown in the figure, the upper magnet 15U, the lower magnet 15D and the bracket 11 are arranged in a manner that the effective magnetic flux is orthogonal to the plate-like portion 11B.

[0074] The vibrating body VB is always subjected to a force caused by eddy currents, i.e., a braking force, which acts in the opposite direction to the vibration direction. Specifically, the vibrating body VB vibrates by the Lorentz force generated by the driving mechanism DM, and at the same time, is subjected to a braking force that acts to decelerate the vibration. Moreover, the braking force increases in proportion to the vibration speed of the vibrating body VB. Therefore, the vibration acceleration at the natural vibration frequency of the vibrating body VB and the vibration frequency near it is reduced by its braking force.

[0075] In addition, the larger the eddy current, the greater the braking force caused by the eddy current. In addition, the smaller the resistivity of the conductive component (bracket 11), the larger the eddy current, the greater the conductivity of the conductive component (bracket 11), the larger the eddy current, and the greater the thickness of the conductive component (bracket 11) (the thickness of the plate-like portion 11B), the larger the eddy current. Therefore, the material and thickness of the bracket 11 are selected to obtain the desired braking force. In the example shown in the figure, the bracket 11 is formed of tough copper, which is the same material as the wire material of the coil 12, and has a thickness of about 0.3 mm.

[0076] With this configuration, the durability of the vibration generating device 101 can be improved compared to the case where the viscoelastic component for generating the braking force is installed between the vibrating body VB and the non-vibrating body NV. This is because the viscoelastic component is easily affected by the ambient temperature, dimensional deviation, degradation, peeling, or tearing, but the bracket 11 is not easily affected by them.

[0077] In addition, if Figure 4 As shown in the above figure, 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 also be a cutout.

[0078] The first opening H1 is a non-circular (roughly teardrop-shaped) opening for preventing the upper surface of the coil 12 from tilting relative to the lower surface of the plate-like portion 11B due to interference between the plate-like portion 11B and the conductor portion CP when the coil 12 is mounted on the lower surface of the plate-like portion 11B of the bracket 11.

[0079] The second opening H2 is a substantially circular opening for receiving a jig (not shown) used to position the air 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.

[0080] The third opening H3 is a substantially circular opening formed to insert a jig for maintaining an appropriate gap between the bracket 11 and the coil 12 when supplying adhesive between the lower surface of the plate-shaped portion 11B of the bracket 11 and the upper surface of the coil 12 .

[0081] In the example shown in the figure, the first opening H1 to the third opening H3 are all formed at positions avoiding the track TR. The track TR is the track on the plate-shaped portion 11B through which the center axis of the effective magnetic flux passes when the vibrating body VB vibrates. That is, the vibration generating device 101 is configured so that the center axis of the effective magnetic flux extending along the Z-axis direction moves along the linear track TR in the X-axis direction. In the example shown in the figure, Fig.10 As shown in the magnetic force lines MF, the center axis of the effective magnetic flux includes the center axes of the effective magnetic fluxes generated by the first lower magnet portion 15D1, the second upper magnet portion 15U2, the third lower magnet portion 15D3, and the fourth upper magnet portion 15U4, respectively. In addition, the trajectory TR is located on the vibration axis VA when viewed from above. In addition, the center axis of the effective magnetic flux can also be renamed as the coil axis of each of the first coil winding portion 12A, the second coil winding portion 12B, and the third coil winding portion 12C.

[0082] 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 including the track TR located in the central part of the plate-like portion 11B. Specifically, the central region CR is a region where the eddy current generated by the effective magnetic flux generated by the magnet 15 and the conductive component (bracket 11) arranged to cross the effective magnetic flux flows. Figure 4 In the above figure, a dot pattern is added to the central area CR for clarity.

[0083] In the example shown in the figure, since the rectangular central region CR of the plate-shaped portion 11B of the vibration generating device 101 does not form openings such as the first opening H1 to the third opening H3, it is easier for eddy currents to flow than when an opening is formed in the central region CR. In addition, in the vibration generating device 101, since the rectangular central region CR of the plate-shaped portion 11B is flat and does not have concave portions or convex portions, it is easier for eddy currents to flow than when a concave portion or convex portion is formed in the central region CR and it is not flat.

[0084] The central region CR is bilaterally symmetrical with respect to the vibration axis VA in a plan view and is symmetrical with respect to a line segment L1 (see Figure 4 This structure has the effect of making the magnitude of the braking force when the vibrating body VB moves forward (X1 direction) and the magnitude of the braking force when the vibrating body VB moves backward (X2 direction) the same.

[0085] Next, refer to Fig.11 and Fig.12 , the assembly method of the vibration generating device 101 is described. Fig.11 and Fig.12 1 is a perspective view of the components constituting the vibration generating device 101. Fig.11 and Fig.12 In the figure, a dot pattern is added on the newly installed parts for clarity.

[0086] Specifically, Fig.11 The above figure is a three-dimensional diagram of the leaf spring 17. Fig.11 The central figure is a perspective view of the leaf spring 17 to which the lower yoke 10D is mounted. Fig.11 The following figure shows the installation Fig.11 The center figure is a perspective view of the base member 2 with the leaf spring 17 in the state shown.

[0087] Fig.12 The top figure is a perspective view of the base member 2 to which the lower magnet 15D is further installed. Fig.12 The second figure from the top is a three-dimensional view of the base member 2 further equipped with a bracket 11 and a coil 12. Fig.12 The third figure from the top is a perspective view of the base member 2 to which the upper yoke 10U and the wiring substrate 13 are further installed. Fig.12 The bottom figure is a perspective view of the base member 2 to which the cover member 1 is further mounted.

[0088] First, if Fig.11 As shown in the central figure of the figure, the lower yoke 10D overlaps the upper surface of the vibration body support part 17B of the leaf spring 17. In the example shown in the figure, the bottom plate part BW of the lower yoke 10D overlaps the upper surface of the vibration body support part 17B without applying an adhesive. In addition, a vibration-damping steel plate (not shown) as a reinforcing material for suppressing the deflection of the upright part EP may be attached to the outer side surface of the upright part EP of the elastic arm part 17C of the leaf spring 17.

[0089] Afterwards, if Fig.11As shown in the figure below, the leaf spring 17 overlapped with the lower yoke 10D is provided on the upper surface of the bottom plate portion 2B of the base member 2. Then, the lower yoke 10D is joined to the leaf spring 17, and the base member 2 is joined to the leaf spring 17. In the example shown in the figure, the bottom plate portion BW of the lower yoke 10D is joined to the upper surface of the vibration 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.

[0090] Afterwards, if Fig.12 As shown in the top figure, the lower magnet 15D is overlapped on the upper surface of the bottom plate portion BW of the lower yoke 10D. In the example shown in the figure, the lower yoke 10D and the lower magnet 15D are mutually attracted by magnetic force, so they are not joined by laser welding or adhesive. However, the lower yoke 10D and the lower magnet 15D may be joined by laser welding or adhesive.

[0091] Afterwards, if Fig.12 As shown in the second figure from the top, a non-vibrating body NV is installed on the base component 2. In the example shown in the figure, the non-vibrating body NV is composed of a bracket 11, a coil 12 and a wiring substrate 13. Moreover, the supporting portion 2P of the base component 2 is joined to the connecting portion 11A of the bracket 11 by fastening components, riveting, laser welding, or adhesives. In the example shown in the figure, the supporting portion 2P and the connecting portion 11A are joined by an adhesive. In addition, before the non-vibrating body NV is installed on the base component 2, the coil 12 is joined to the bracket 11 by an adhesive, and the wiring substrate 13 is joined to the bracket 11 by a double-sided tape.

[0092] Afterwards, if Fig.12 As shown in the third figure from the top, the upper yoke 10U equipped with the upper magnet 15U is joined to the lower yoke 10D at a position that does not contact the non-vibrating body NV. Specifically, the upper yoke 10U and the lower yoke 10D are joined by welding or adhesive at a portion where the concave portion RC formed in the lower yoke 10D meshes with the convex portion PR of the upper yoke 10U. In the example shown in the figure, the upper yoke 10U and the lower yoke 10D are joined by laser welding.

[0093] In addition, before the upper yoke 10U is joined to the lower yoke 10D, the upper magnet 15U overlaps the lower surface of the top plate portion TW of the upper yoke 10U, similarly to the case where the lower magnet 15D overlaps the upper surface of the bottom plate portion BW of the lower yoke 10D. Since the upper yoke 10U and the upper magnet 15U are mutually attracted by magnetic force, they are not joined by laser welding or adhesive. However, the upper yoke 10U and the upper magnet 15U may be joined by laser welding or adhesive.

[0094] Afterwards, if Fig.12 As shown in the bottom figure, the cover member 1 is installed in a manner covering the base member 2 and the components other than the wiring substrate 13. In the example shown in the figure, the lower end of the outer peripheral wall portion 1A of the cover member 1 is joined to the peripheral edge portion of the bottom plate portion 2B of the base member 2 by laser welding. In addition, the cover member 1 and the base member 2 may also be joined by a fastening member, an adhesive, or riveting.

[0095] In this way, vibration generator 101 is assembled. The adhesive used in the above-mentioned assembly process may be any of a thermosetting adhesive, a light-curing adhesive, a moisture-curing adhesive, or a hybrid adhesive as a combination thereof. In the example shown in the figure, the adhesive is a thermosetting adhesive.

[0096] Next, refer to Fig.13 , the relationship between the driving frequency and vibration acceleration of the vibrating body VB is explained. Fig.13 : is a graph showing the relationship between the driving frequency and vibration acceleration of the vibrating body VB, with the driving frequency [Hz] arranged on the horizontal axis and the vibration acceleration [Gp-p] arranged on the vertical axis. Fig.13 The solid line curve shows the relationship between the drive frequency [Hz] and the vibration acceleration [Gp-p] when the copper bracket 11 is used. Fig.13 The dotted curve represents the relationship between the driving frequency and the vibration acceleration when a stainless steel bracket is used instead of the copper bracket 11. The copper bracket 11 and the stainless steel bracket are formed to be the same size and shape. In addition, the thickness of the copper bracket 11 and the thickness of the stainless steel bracket are both 0.2 [mm]. In addition, the value f0 of the driving frequency is equivalent to the resonance frequency (natural vibration frequency) of the vibrating body VB, and vibrating the vibrating body VB with a driving frequency of the value f0 means vibrating the vibrating body VB at the resonance frequency. Similarly, the value 2f0 of the driving frequency is equivalent to a frequency twice the resonance frequency of the vibrating body VB, and vibrating the vibrating body VB with a driving frequency of the value 2f0 means vibrating the vibrating body VB at a frequency twice the resonance frequency. The same is true for the value 3f0 (frequency three times the resonance frequency) and the value 4f0 (frequency four times the resonance frequency) of the driving frequency.

[0097] In the case of the copper bracket 11, as shown by the solid line curve, when the driving vibration frequency is f0, the vibration acceleration of the vibrating body VB is 1.0, and when the driving vibration frequency is 2f0, the vibration acceleration is 0.6. That is, the value of 1.0 of the vibration acceleration when the vibrating body VB vibrates at the resonance frequency is less than twice (about 1.67 times) the value of 0.6 of the vibration acceleration when the vibrating body VB vibrates at a frequency twice the resonance frequency.

[0098] On the other hand, in the case of a bracket made of stainless steel, as shown by the dotted line curve, when the driving vibration frequency is f0, the vibration acceleration of the vibrating body VB is 1.4, and when the driving vibration frequency is 2f0, the vibration acceleration is 0.6. That is, the value of 1.4 of the vibration acceleration when the vibrating body VB vibrates at the resonance frequency is twice greater than the value of 0.6 when the vibrating body VB vibrates at a frequency twice the resonance frequency, which is about 2.33 times.

[0099] Thus, in the case where the bracket 11 is made of copper, the vibration generating device 101 can suppress the value of the vibration acceleration when the vibrating body VB vibrates at the resonance frequency to less than twice the value of the vibration acceleration when the vibrating body VB vibrates at a frequency twice the resonance frequency. Therefore, compared with the case where the bracket is made of stainless steel, this configuration has the effect of suppressing the vibration of the vibrating body VB at the resonance frequency and its vicinity. The same is true for the case where the bracket 11 is formed of aluminum, an alloy containing copper, or an alloy containing aluminum.

[0100] As mentioned above, if Figure 1 to Figure 3 As shown, a vibration generating device 101 of an embodiment of the present disclosure includes: a housing HS; a movable body (vibrating body VB) accommodated in the housing HS; a supporting member (elastic supporting member ES) supporting the movable body (vibrating body VB) so as to be able to vibrate along a first direction (X-axis direction); a coil 12 having a wire harness portion extending along a second direction (Y-axis direction) perpendicular to the first direction (X-axis direction); and a magnetic flux generating member (magnet 15) generating a magnetic flux passing through the wire harness portion along a third direction (Z-axis direction) perpendicular to the first direction (X-axis direction) and the second direction (Y-axis direction). Furthermore, the vibration generating device 101 is configured such that one of the coil 12 and the magnetic flux generating member (magnet 15) is fixed to the housing HS, and the other of the coil 12 and the magnetic flux generating member (magnet 15) is fixed to the movable body (vibrating body VB). In addition, the vibration generating device 101 has a conductive component (bracket 11), which is fixed relative to the coil 12 and extends along the first direction (X-axis direction) in a manner transverse to the magnetic flux, and generates eddy current when the movable body (vibrating body VB) moves along the first direction (X-axis direction) to reduce the acceleration (vibration acceleration) of the movable body (vibrating body VB).

[0101] In this structure, the magnetic generating component (magnet 15) and the conductive component (bracket 11) can generate a braking force (force to suppress vibration) in the same manner as the gel-like damper component that generates viscous resistance. In addition, this structure can suppress the resonance of the vibrating body VB by its braking force. In addition, in this structure, the braking force is generated by eddy current. Therefore, this structure that does not include a deformation part or a sliding part like the gel-like damper component has the effect of improving the durability of the vibration generating device 101.

[0102] In addition, in a general vibration generating device, the braking force generated by the eddy current may also become an undesirable force that reduces the vibration acceleration, but the vibration generating device 101 of the present disclosure is configured to suppress the resonance of the vibrating body VB by actively utilizing the braking force generated by the eddy current.

[0103] The conductive component (bracket 11) may also be formed of a non-magnetic metal. This configuration can prevent the magnetic force (attractive force) from acting between the conductive component and the magnet 15 as in the case where the conductive component (bracket 11) is formed of a magnetic metal, and has the effect of suppressing the efficient use of the driving force of the driving mechanism DM from being hindered by such an attractive force. In the example shown in the figure, the conductive component (bracket 11) is formed of tough copper and is contained in a housing HS formed of austenitic stainless steel having a lower conductivity than tough copper. This configuration has the effect of suppressing the outflow of eddy currents to the outside of the housing HS.

[0104] In addition, the conductive component (bracket 11) can also be formed of a material having a conductivity greater than that of iron and iron alloys. This structure has the effect of increasing the braking force (force to suppress vibration) generated by eddy currents. This is because the greater the conductivity, the greater the braking force generated by eddy currents. Therefore, this structure has the effect of suppressing the resonance of a heavier vibrating body VB, for example.

[0105] The conductive member (bracket 11) may be preferably formed of copper, aluminum, or an alloy thereof. This configuration has an effect of reducing material costs compared to a case where the conductive member is formed of a noble metal such as silver or an alloy thereof.

[0106] In addition, the conductive component (bracket 11) can also be arranged between the magnetic flux generating component (magnet 15) and the coil 12. Compared with the case where the coil 12 is arranged between the conductive component (bracket 11) and the magnetic flux generating component (magnet 15), this configuration can set the conductive component (bracket 11) at a position close to the magnetic flux generating component (magnet 15), thereby having the effect of increasing the braking force (force to suppress vibration). This is because the closer the conductive component (bracket 11) is to the magnetic flux generating component (magnet 15), the higher the magnetic flux density passing through the conductive component (bracket 11), and the higher the magnetic flux density passing through the conductive component (bracket 11), the greater the braking force.

[0107] In addition, the vibration generating device 101 may also have a magnetic flux attracting component that attracts magnetic flux at a position separated from the magnetic flux generating component (magnet 15) along the third direction (Z-axis direction). In this case, the conductive component (bracket 11) may also be arranged between the magnetic flux generating component (magnet 15) and the magnetic flux attracting component. In the illustrated example, the magnet 15 functions as a magnetic flux generating component and a magnetic flux attracting component, and the yoke 10 functions as a magnetic flux attracting component. Specifically, when the upper magnet 15U functions as a magnetic flux generating component, the lower yoke 10D and the lower magnet 15D function as magnetic flux attracting components. In addition, when the lower magnet 15D functions as a magnetic flux generating component, the upper yoke 10U and the upper magnet 15U function as magnetic flux attracting components. In addition, one of the upper magnet 15U and the lower magnet 15D may be omitted. Moreover, when the upper magnet 15U is omitted, the lower magnet 15D functions as a magnetic flux generating component, and the upper yoke 10U functions as a magnetic flux attracting component. The same is true when the lower magnet 15D is omitted. This structure makes the angle (hereinafter referred to as "magnetic flux angle") formed between the extension direction (X-axis direction or Y-axis direction) of the conductive component (bracket 11) and the direction (Z-axis direction) of the magnetic flux from the magnetic flux generating component (magnet 15) toward the magnetic flux attracting component become approximately a right angle, so it has the effect of increasing the braking force (force to suppress vibration) compared to the case where 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.

[0108] For example, the magnetic flux generating component may be the upper magnet 15U as the first permanent magnet, and the magnetic flux attracting component may be the lower magnet 15D as the second permanent magnet. Figure 7 As shown, the first permanent magnet (upper magnet 15U) and the second permanent magnet (lower magnet 15D) can also be configured so that the opposing surfaces have different polarities. This configuration has the effect of further increasing the braking force (force to suppress vibration) because it can make the magnetic flux angle closer to a right angle.

[0109] In addition, if Figure 4As shown, the vibration generating device 101 may also include a bracket 11, which includes: a plate-like portion 11B extending along planes parallel to the first direction (X-axis direction) and the second direction (Y-axis direction) and on which the coil 12 is mounted; and a connecting portion 11A extending from the plate-like portion 11B and fixed to the housing HS. In this case, the coil 12 may also be fixed to the housing HS (base component 2) via the bracket 11, and the magnetic flux generating component (magnet 15) may also be fixed to the movable body (vibrating body VB). Moreover, the plate-like portion 11B may also be formed of copper, aluminum, or an alloy thereof, and function as a conductive component. This configuration has the effect of reducing the number of components compared to the case where a component different from the bracket 11 (plate-like portion 11B) functions as a conductive component.

[0110] In addition, the conductive member (bracket 11) may be configured to be arranged along the locus TR (refer to Figure 4 The position corresponding to the position of the conductive member (bracket 11) does not have an opening. That is, the conductive member (bracket 11) may also be configured to always intersect with the magnetic flux at least in the central region CR when the movable body (vibrating body VB) vibrates. This configuration has an effect of facilitating the flow of eddy currents compared to the case of having an opening intersecting with the track TR.

[0111] In addition, the coil 12 may also have a hollow core portion AC as the innermost portion of the coil winding portion and a conductor portion CP extending outward from the hollow core portion AC. Furthermore, the conductive member (bracket 11) may also have an opening for preventing interference with the conductor portion CP when the coil 12 is mounted (see Figure 4 In this case, the opening (first opening H1) may be formed at a position avoiding the track TR. That is, the opening (first opening H1) may be formed at a position avoiding the central region CR. This configuration prevents interference between the conductor portion CP and the conductive component (bracket 11), and has an effect of facilitating the flow of eddy currents compared to the case of having an opening (first opening H1) intersecting the track TR.

[0112] like Figure 4 As shown in the following figure, the hollow core portion AC may also be formed into a long hole extending along the second direction (Y-axis direction). Figure 4 As shown in the above figure, the conductor portion CP may also be configured to extend outward from the end portion of the hollow core portion AC in the second direction (Y-axis direction). Figure 4In the example shown in the above figure, the conductor portion CP is configured to extend forward (in the X1 direction) from the right end portion (the end portion on the Y2 side) of the hollow portion AC. Compared with a configuration in which the conductor portion CP extends outward from a portion other than the end portion (e.g., the central portion) of the hollow portion AC, this configuration has the effect of being able to form an opening (first opening) at a position away from the track TR.

[0113] In addition, if Fig.13 As shown, the vibration generating device 101 may also be configured so that the acceleration (vibration acceleration value) of the movable body (vibration body VB) when it vibrates at the resonance frequency is less than or equal to twice the acceleration (vibration acceleration value) of the movable body (vibration body VB) when it vibrates at a frequency twice the resonance frequency. This configuration has the effect of suppressing the vibration of the vibration body VB at the resonance frequency and in the vicinity thereof.

[0114] The preferred embodiments of the present invention are described in detail above. However, the present invention is not limited to the above embodiments. Various modifications or substitutions can be applied to the above embodiments without departing from the scope of the present invention. In addition, the features described with reference to the above embodiments can also be appropriately combined as long as they are not technically contradictory.

[0115] For example, in the above embodiment, the magnet 15 is a component of the vibrating body VB, and the coil 12 is a component of the non-vibrating body NV, but the magnet 15 may be a component of the non-vibrating body NV, and the coil 12 may be a component of the vibrating body VB. That is, the vibration generating device 101 may be configured such that the magnet 15 is fixed to the cover part 1 or the base part 2, and the bracket 11 and the coil 12 vibrate together with the yoke 10.

[0116] In addition, in the above embodiment, the vibrating body VB includes the yoke 10 and the magnet 15, but the yoke 10 may also be a component of the non-vibrating body NV. In this case, the yoke 10 may also be fixed to the inner surface of the housing HS. In addition, in this case, the coil 12 may be fixed to the inner surface of the conductive component (bracket 11), and the conductive component (bracket 11) may also be fixed to the inner surface of the yoke 10. That is, the coil 12 may be arranged between the vibrating body VB (magnet 15) and the conductive component (bracket 11), and may also be arranged between the yoke 10 and the conductive component (bracket 11).

[0117] In addition, in the above-mentioned embodiment, the magnet 15 includes the upper magnet 15U and the lower magnet 15D, but one of the upper magnet 15U and the lower magnet 15D may be omitted. For example, the lower magnet 15D may be omitted. In this case, the yoke 10 may also be a component of the non-vibrating body NV. For example, the upper yoke 10U may be omitted, and the lower yoke 10D may be fixed to the base member 2. In addition, in this case, a conductive component such as the bracket 11 may also be arranged on the opposite side of the upper magnet 15U via the coil 12, and fixed to the base member 2 or the lower yoke 10D.

[0118] In addition, the conductive component (bracket 11) may also be a cylindrical component. In this case, the coil 12 may also be wound around the cylindrical conductive component. Furthermore, the magnet 15 may also be configured to vibrate along the axial direction of the cylindrical conductive component inside the cylindrical conductive component. In addition, in this configuration, the coil 12 wound around the outer peripheral surface of the cylindrical conductive component may also be fixed to the inner peripheral surface of the cylindrical yoke 10 disposed outside thereof. Furthermore, the outer peripheral surface of the cylindrical yoke 10 may also be further fixed to the housing HS located outside thereof.

[0119] The bracket 11 may also be composed of a base formed of a non-conductive member and a conductive member (conductive film) attached to the base. In this case, the conductive film may be a film formed of, for example, copper, aluminum, or an alloy thereof.

[0120] In addition, in the above-mentioned embodiment, the vibration generating device 101 is configured to include the magnet 15 magnetized with 8 poles and the coil 12 having three coil winding parts (six wire harness parts), but it can also be configured to include the magnet 15 magnetized with a number of poles other than 8 poles such as 2 poles, 4 poles, 6 poles, 10 poles, or 12 poles and the coil 12 having a corresponding number of wire harness parts. That is, the coil 12 can also be configured to have one, two, or more than four coil winding parts.

[0121] This application claims priority based on Japanese Patent Application No. 2022-123572 filed on August 2, 2022, the entire contents of which are incorporated herein by reference.

[0122] Description of Reference Numerals

[0123]

Claims

1. A vibration generating device, characterized in that: have: case; A movable body is accommodated in the housing; a supporting member that supports the movable body so as to be able to vibrate along a first direction; a coil having a wire bundle portion extending along a second direction perpendicular to the first direction; as well as a magnetic flux generating member for generating a magnetic flux passing through the wiring harness portion along a third direction perpendicular to the first direction and the second direction, One of the coil and the magnetic flux generating member is fixed relative to the housing. The other of the coil and the magnetic flux generating member is fixed to the movable body. The vibration generator includes a conductive member that is fixed to the coil and extends in the first direction so as to cross the magnetic flux, and generates eddy current to reduce acceleration of the movable body when the movable body moves in the first direction.

2. The vibration generating device according to claim 1, characterized in that: The conductive member is formed of a non-magnetic metal.

3. The vibration generating device according to claim 1, characterized in that: The electrical conductivity of the conductive component is greater than that of iron and iron alloys.

4. The vibration generating device according to claim 1, characterized in that: The conductive member is formed of copper, aluminum, or an alloy thereof.

5. The vibration generating device according to any one of claims 1 to 4, characterized in that: The conductive member is provided between the magnetic flux generating member and the coil.

6. The vibration generating device according to any one of claims 1 to 4, characterized in that: The vibration generating device further includes a magnetic flux attracting member at a position separated from the magnetic flux generating member along the third direction, the magnetic flux attracting member attracting the magnetic flux, The conductive member is arranged between the magnetic flux generating member and the magnetic flux attracting member.

7. The vibration generating device according to claim 6, characterized in that: The magnetic flux generating component is a first permanent magnet, The magnetic flux attracting component is a second permanent magnet, The first permanent magnet and the second permanent magnet are arranged so that surfaces facing each other have different polarities.

8. The vibration generating device according to claim 1, wherein: The vibration generating device further includes a bracket having a plate-like portion and a connecting portion, the plate-like portion extending along a plane parallel to the first direction and the second direction and mounted with the coil, and the connecting portion extending from the plate-like portion and fixed to the housing. The coil is fixed to the housing via the bracket. The magnetic flux generating member is fixed to the movable body, The plate-shaped portion is formed of copper, aluminum, or an alloy thereof, and functions as the conductive member.

9. The vibration generating device according to claim 1, wherein: The conductive member does not have an opening at a position corresponding to a locus of the center of the magnetic flux when the movable body vibrates.

10. The vibration generating device according to claim 9, characterized in that: The coil has a hollow core portion and a conductor portion, the conductor portion extending outward from the hollow core portion. The conductive member has an opening for preventing interference with the lead wire portion when the coil is mounted. The opening is formed at a position avoiding the track.

11. The vibration generating device according to claim 10, characterized in that: The hollow portion is formed in a long hole shape extending along the second direction, The lead portion extends outward from an end portion of the hollow portion in the second direction.

12. The vibration generating device according to claim 1, wherein: The acceleration when the movable body vibrates at the resonance frequency is twice or less than the acceleration when the movable body vibrates at a frequency twice the resonance frequency.

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