Vibration generating device

Abstract

A vibration generating device (101) is provided with a fixed body (FB), a movable body (MB), and a support member (7) that supports the movable body (MB) so as to be able to vibrate in the Y-axis direction with respect to the fixed body (FB). The fixed body (FB) includes a coil (4) having a wire harness portion (4S) including a plurality of conductive wires extending in the X-axis direction, and the coil (4) is disposed on the lower side of the movable body (MB). The movable body (MB) includes a permanent magnet (5) that generates a downward first magnetic flux (MF1) and an upward second magnetic flux (MF2). The fixed body (FB) includes a conductive plate-shaped member (3) that is disposed on the upper side of the movable body (MB), extends in the Y-axis direction so as to intersect the second magnetic flux (MF2), and generates an eddy current when the movable body (MB) moves in the Y-axis direction.

Description

TECHNICAL FIELD

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

[0002] In the past, an actuator (vibration generating device) that generates vibration is known (see Patent Literature 1). The actuator is configured so that resonance when a movable body is vibrated can be suppressed by a gel-like damping member disposed between a support body and the movable body.

[0003] PRIOR ART DOCUMENT PATENT LITERATURE Patent Literature 1: Japanese Patent Application Publication No. 2019-013086 SUMMARY

[0004] PROBLEMS TO BE SOLVED BY THE INVENTION However, the above-described gel-like damping member can have a problem in terms of durability. Therefore, it is desirable to provide a vibration generating device having a configuration in which durability in which resonance can be suppressed is excellent.

[0005] MEANS FOR SOLVING THE PROBLEMS The vibration generating device of the embodiment of the present disclosure has a fixed body, a movable body, and a support member that supports the movable body so as to be able to vibrate in a first direction with respect to the fixed body, the fixed body includes a coil having a wire bundle portion including a plurality of conductive wires extending in a second direction perpendicular to the first direction, and is disposed on one side in a third direction perpendicular to the first direction and the second direction of the movable body, the movable body includes a permanent magnet that generates a first magnetic flux in a direction toward the wire bundle portion and a second magnetic flux in a direction toward the opposite side of the wire bundle portion, the fixed body includes a conductive plate-shaped member disposed on the other side in the third direction of the movable body and extending in the first direction in a manner that intersects the second magnetic flux, and an eddy current is generated when the movable body moves in the first direction.

[0006] EFFECT OF THE INVENTION The above-described vibration generating device has a configuration in which durability in which resonance can be suppressed is excellent. BRIEF DESCRIPTION OF DRAWINGS

[0007] Figure 1 is a diagram that shows a configuration example of a vibration generating device.

[0008] Figure 2 is an exploded perspective view of a vibration generating device.

[0009] Figure 3 is a six-face view of a support member.

[0010] Figure 4It is a three-dimensional view of the movable body and supporting components.

[0011] Figure 5 These are the front and bottom views of the movable body and supporting components.

[0012] Figure 6 These are top and cross-sectional views of the vibration generating device.

[0013] Figure 7 It is a top view of the coil, movable body, and supporting components.

[0014] Figure 8 It is a front view of the conductive plate-shaped component, coil, movable body, and supporting component.

[0015] Figure 9 It is a top view of the conductive plate-shaped component, the movable body, and the supporting component.

[0016] Figure 10 This is a cross-sectional view of the vibration generating device. Detailed Implementation

[0017] Hereinafter, the vibration generating apparatus 101 of the present disclosure will be described with reference to the accompanying drawings. Figure 1 This is a diagram illustrating a structural example of the vibration generating device 101. Specifically, Figure 1 The image above is a perspective view of the vibration generating device 101. Figure 1 The image below is an exploded perspective view of the vibration generating device 101. Figure 2 This is a more detailed exploded perspective view of the vibration generating device 101.

[0018] Figure 1 and Figure 2 In each of these directions, 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. Similarly, Y1 represents one direction of the Y-axis constituting a three-dimensional orthogonal coordinate system, and Y2 represents the other direction of the Y-axis. Likewise, Z1 represents one direction of the Z-axis constituting a three-dimensional orthogonal coordinate system, and Z2 represents the other direction of the Z-axis. In this embodiment, the X1 side of the vibration generating device 101 corresponds to the front side (front face side) of the vibration generating device 101, and the X2 side of the vibration generating device 101 corresponds to the rear side (back side) of the vibration generating device 101. Furthermore, the Y1 side of the vibration generating device 101 corresponds to the left side of the vibration generating device 101, and the Y2 side of the vibration generating device 101 corresponds to the right side of the vibration generating device 101. Moreover, the Z1 side of the vibration generating device 101 corresponds to the upper side of the vibration generating device 101, and the Z2 side of the vibration generating device 101 corresponds to the lower side of the vibration generating device 101. This also applies to other figures.

[0019] The vibration device VE includes a control unit CTR and a vibration generating device 101. The vibration generating device 101 is configured, for example, to be inserted into an elongated cylindrical object such as a stylus needle, and vibrates in the radial direction (short side direction) of the cylindrical object. Therefore, the vibration generating device 101 is preferably configured such that its length in the vibration direction is as small as possible, provided that the desired vibration power can be achieved. Specifically, the vibration generating device 101 includes a frame HS as a box-shaped housing, a movable body MB housed within the frame HS, a conductive plate-shaped member 3 mounted on the frame HS, and a coil 4 mounted on the frame HS via an insulating substrate BM. The frame HS, the conductive plate-shaped member 3, and the coil 4 constitute a fixed body FB. The control unit CTR is connected via an adhesive to an input terminal IT provided on the insulating substrate BM fixed to the frame HS. In this embodiment, the insulating substrate BM is a combination of a flexible substrate and a rigid substrate. However, the insulating substrate BM can also be a flexible substrate or a rigid-flexible composite substrate, etc. Furthermore, Figure 1 The dashed line in the above figure schematically indicates that the control unit CTR is electrically connected to the input terminal IT provided on the insulating substrate BM, which connects the control unit CTR to the input terminal IT.

[0020] like Figure 1 As shown in the figure above, the frame HS has a roughly cuboid shape, with the area of ​​the surfaces parallel to the XY plane (upper and lower surfaces) being larger than the other surfaces. In this embodiment, the frame HS is composed of a cover 1 and a base plate 2. The cover 1 is made of a non-magnetic metal such as austenitic stainless steel. However, the cover 1 can also be made of synthetic resin or a magnetic metal.

[0021] In the example diagram, such as Figure 1 As shown in the figure below, the cover 1 is configured to form a frame HS with five surfaces (upper surface, front surface, left surface, rear surface, and right surface) by bending a metal sheet. Specifically, the cover 1 includes a generally rectangular cylindrical portion 1A and a generally rectangular flat plate portion 1B. The cylindrical portion 1A includes a front side plate portion 1A1, a left side plate portion 1A2, a rear side plate portion 1A3, and a right side plate portion 1A4. More specifically, the cylindrical portion 1A has a front side plate portion 1A1 and a rear side plate portion 1A3 facing each other, and a left side plate portion 1A2 and a right side plate portion 1A4 that are perpendicular to the front side plate portion 1A1 and the rear side plate portion 1A3 and facing each other.

[0022] The base plate 2 is configured to form the lower surface (bottom surface) of the frame HS. In this embodiment, the base plate 2 is configured as a generally rectangular flat plate. In the example shown, the base plate 2 is formed of a magnetic metal and functions as a fixed-side magnetic component. As a fixed-side magnetic component, the base plate 2 is configured to control the path of the magnetic field lines generated by the permanent magnet 5, which is a movable-side magnetic field generating component. In addition, the base plate 2, as a fixed-side magnetic component, is a component constituting the drive unit DM. However, the base plate 2 may also be formed of a non-magnetic metal such as austenitic stainless steel.

[0023] The cover 1 is fixed to the base plate 2. Specifically, the cover 1 is joined to the base plate 2 by welding the lower end of the cylindrical portion 1A to the base plate 2. The lower end of the cylindrical portion 1A and the base plate 2 can also be joined by brazing, adhesive, or riveting. In addition, the insulating substrate BM is joined to the upper surface of the base plate 2 by adhesive.

[0024] The conductive plate-shaped component 3 is fixed to the top surface of the cover 1 by means of double-sided tape, adhesive, or riveting. In the example shown, the conductive plate-shaped component 3 is a copper plate, fixed to the top surface of the cover 1 by double-sided tape. Alternatively, the conductive plate-shaped component 3 may also be formed containing copper or aluminum.

[0025] Coil 4 is an example of a fixed-side magnetic field generating component, configured to generate a magnetic field while fixed to the frame HS. Furthermore, coil 4 is a component constituting the drive unit DM. In this embodiment, coil 4 is a winding coil formed by winding a wire whose surface is covered with insulating material, and is fixed to the insulating substrate BM by adhesive. Additionally, for clarity, Figure 1 and Figure 2 Detailed diagrams illustrating the winding state of the wire are omitted. The same applies to the other diagrams showing coil 4.

[0026] Specifically, such as Figure 1 As shown in the figure below, coil 4 is configured such that one end (first end 4A) is connected to the first conductor pad PD1 formed on the upper surface of the insulating substrate BM, and the other end (second end 4B) is connected to the second conductor pad PD2 formed on the upper surface of the insulating substrate BM.

[0027] The control section CTR is configured to be able to control the operation of the movable body MB. In the present embodiment, the control section CTR is a device including an electronic circuit and a nonvolatile storage device or the like, and is configured to be able to control the direction and magnitude of the current flowing in the coil 4. The control section CTR can be configured to control the direction and magnitude of the current flowing in the coil 4 according to a control instruction from an external device such as a computer, or can be configured to control the direction and magnitude of the current flowing in the coil 4 without accepting a control instruction from an external device. That is, the control section CTR can also be a microcomputer provided with a CPU. Furthermore, in the present embodiment, the control section CTR is provided outside the frame body HS, but can also be provided inside the frame body HS.

[0028] The movable body MB is configured to be able to vibrate the frame body HS. In the present embodiment, the movable body MB is configured to reciprocate in a state of being installed inside the frame body HS via the support member 7, thereby being able to vibrate the frame body HS.

[0029] Specifically, the movable body MB includes the permanent magnet 5 and the plate-shaped metal member 6, and is configured to be elastically supported by the support member 7. More specifically, the movable body MB is configured to have a prescribed natural vibration frequency, and is able to reciprocate (vibrate) with respect to the frame body HS along a vibration axis VA (see the lower drawing of FIG. 10) extending in a prescribed direction (Y-axis direction). Figure 1

[0030] The permanent magnet 5 is configured to be able to generate a magnetic field in a state of being able to reciprocate (vibrate) with respect to the frame body HS. In addition, the permanent magnet 5 is a component that constitutes the drive unit DM. In the present embodiment, as shown in FIG. 5, the permanent magnet 5 includes a left magnet 5L and a right magnet 5R that are magnetized to two poles in the Z-axis direction. In the present embodiment, the permanent magnet 5 is a rectangular parallelepiped-shaped magnet, but can also be a cylindrical magnet or the like. Figure 2 Figure 2 In the present embodiment, for the sake of clarity, a cross pattern is added to the S-pole portion of the permanent magnet 5, and a dot pattern is added to the N-pole portion of the permanent magnet 5. The same is true in other drawings that illustrate the polarity of the permanent magnet 5.

[0031] The plate-shaped metal member 6 is a component for mounting the permanent magnet 5 to the support member 7. In the illustrated example, the plate-shaped metal member 6 is joined to the support member 7 by welding. In addition, the plate-shaped metal member 6 functions as a movable-side magnetic member, and is configured to be able to control the path of the magnetic lines of force of the magnetic field generated by the permanent magnet 5. In addition, the plate-shaped metal member 6 is a component that constitutes the drive unit DM. In the present embodiment, the plate-shaped metal member 6 includes a central portion 6C that mounts the permanent magnet 5, a rear portion 6B disposed on the rear side of the central portion 6C, a front portion 6F disposed on the front side of the central portion 6C, a left portion 6L disposed on the left side of the central portion 6C, and a right portion 6R disposed on the right side of the central portion 6C. Figure 1 Figure 2 ​​​In the illustrated example, the permanent magnet 5 is attracted to the top surface CP of the plate-shaped metal member 6. Alternatively, the permanent magnet 5 and the plate-shaped metal member 6 can be fixed to each other by an adhesive. In this case, the plate-shaped metal member 6 can also be formed of a non-magnetic metal, and the drive unit DM can also be composed of the coil 4 and the permanent magnet 5.

[0032] The drive unit DM is an example of a vibration force generator configured to enable the movable body MB to vibrate along the vibration axis VA. In the present embodiment, the drive unit DM is an electromagnetic drive mechanism composed of the base plate 2 (fixed-side magnetic member), the coil 4 (fixed-side magnetic field generating member), the permanent magnet 5 (movable-side magnetic field generating member), and the plate-shaped metal member 6 (movable-side magnetic member). Specifically, the drive unit DM is configured to enable the movable body MB (permanent magnet 5) elastically supported by the support member 7 to vibrate along the vibration axis VA by means of the Lorentz force corresponding to the direction and magnitude of the current supplied to the coil 4 under the control of the control section CTR.

[0033] The support member 7 is disposed between the fixed body FB (frame body HS) and the movable body MB, and is configured to be capable of elastically supporting the movable body MB. In the present embodiment, the support member 7 is a leaf spring formed of a metal plate, and includes a left-side elastic support portion 7L mounted to the inner side surface (surface on the Y2 side) of the left-side plate portion 1A2 of the frame body HS, a right-side elastic support portion 7R mounted to the inner side surface (surface on the Yl side) of the right-side plate portion 1A4 of the frame body HS, and a central portion 7C provided between the left-side elastic support portion 7L and the right-side elastic support portion 7R. In the illustrated example, the central portion 7C functions as a connecting plate portion that connects the left-side elastic support portion 7L and the right-side elastic support portion 7R. Alternatively, the central portion 7C can be omitted. In this case, the left-side elastic support portion 7L and the right-side elastic support portion 7R are separate members, respectively, and are fixed to the movable body MB, respectively.

[0034] Alternatively, the support member 7 can include a reinforcing plate portion that suppresses deformation of the central portion 7C. Specifically, the reinforcing plate portion includes at least one of a front-side extending portion that extends downward from a front edge portion of the central portion 7C and a rear-side extending portion that extends downward from a rear edge portion of the central portion 7C.

[0035] Here, the details of the support member 7 will be described with reference to Figure 3 , Figure 4 , and Figure 5 . Figure 3 is a six-view diagram of the support member 7. Figure 4 , and Figure 5 are diagrams of the support member 7 that supports the movable body MB (permanent magnet 5 and plate-shaped metal member 6) so as to be capable of reciprocating motion. Specifically, Figure 4 is a perspective view of the permanent magnet 5, the plate-shaped metal member 6, and the support member 7.Figure 5 The image above is a front view of the permanent magnet 5, the plate-shaped metal component 6, and the support component 7. Figure 5 The image below is a bottom view of the permanent magnet 5, the plate-shaped metal component 6, and the support component 7.

[0036] The central portion 7C is configured to be fixed to the upper surface of the plate-shaped metal component 6. In this embodiment, the lower surface of the central portion 7C is fixed to the upper surface of the plate-shaped metal component 6 by welding.

[0037] The left-side elastic support portion 7L is the part that elastically supports the movable body MB, and has a left-side upright portion 7L1, a first left-side deformable portion 7L2, a left-side folding portion 7L3, a second left-side deformable portion 7L4, and a left-side fixed portion 7L5. The left-side upright portion 7L1 is the left end portion LE of the central portion 7C (see reference). Figure 3 The portion connected to the first left-side deformable portion 7L2 (top view). In this embodiment, the left-side upright portion 7L1 is formed by bending with a crease at the left end LE of the central portion 7C extending along the X-axis direction. The left-side upright portion 7L1 includes a portion that is formed as a straight line in the front view. In this embodiment, the left-side upright portion 7L1 is configured to extend vertically downward (Z2 direction) relative to the central portion 7C. The first left-side deformable portion 7L2 is a portion that is formed as a straight line in the top view. In this embodiment, the first left-side deformable portion 7L2 is configured to extend forward (X1 direction) from the left-side upright portion 7L1. The left-side fold-back portion 7L3 is configured to extend to the left (Y1 direction) from the front end of the first left-side deformable portion 7L2 and bend forward. In this embodiment, the left-side fold-back portion 7L3 is configured to have a U-shape in the top view so that the stress acting on the left-side fold-back portion 7L3 is dispersed over a large area. The second left deformable portion 7L4 is a straight section extending rearward (in the X2 direction) from the left end of the left fold-back portion 7L3. The left fixed portion 7L5 is a portion fixed to the frame HS. In this embodiment, the left fixed portion 7L5 extends rearward (in the Z1 direction) parallel to the left side plate portion 1A2 of the cover 1 from the rear end of the second left deformable portion 7L4, and is fixed to the left side plate portion 1A2 by welding. However, the left fixed portion 7L5 may also be fixed to other parts of the frame HS, such as the front side plate portion 1A1, the rear side plate portion 1A3, the top plate portion 1B, or the bottom plate 2, by welding or the like. In addition, the first left deformable portion 7L2, the left fold-back portion 7L3, and the second left deformable portion 7L4 are also referred to as the left deformable portion 7LT (see reference) as the portion that deforms according to the reciprocating motion of the movable body MB. Figure 3 (Top view).

[0038] The right-side elastic support portion 7R is the part that elastically supports the movable body MB, and includes a right-side upright portion 7R1, a first right-side deformable portion 7R2, a right-side folding portion 7R3, a second right-side deformable portion 7R4, and a right-side fixed portion 7R5. The right-side upright portion 7R1 is the portion that supports the right end RE of the central portion 7C (refer to...). Figure 3 The portion connected to the first right-side deformable portion 7R2 (top view). In this embodiment, the right-side upright portion 7R1 is formed by bending with a crease at the right end RE of the central portion 7C extending along the X-axis direction. The right-side upright portion 7R1 includes a portion that is formed as a straight line in the front view. In this embodiment, the right-side upright portion 7R1 is configured to extend vertically downward (Z2 direction) relative to the central portion 7C. The first right-side deformable portion 7R2 is a portion that is formed as a straight line in the top view. In this embodiment, the first right-side deformable portion 7R2 is configured to extend rearward (X2 direction) from the right-side upright portion 7R1. The right-side fold-back portion 7R3 is configured to extend to the right (Y2 direction) from the rear end of the first right-side deformable portion 7R2 and bend rearward. In this embodiment, the right-side fold-back portion 7R3 is configured to have a U-shape in the top view so that the stress acting on the right-side fold-back portion 7R3 is dispersed over a large area. The second right-side deformable portion 7R4 is a straight section extending forward (in the X1 direction) from the right end of the right-side fold-back portion 7R3. The right-side fixed portion 7R5 is a portion fixed to the frame HS. In this embodiment, the right-side fixed portion 7R5 extends forward (in the X1 direction) parallel to the right-side plate portion 1A4 of the cover 1 from the front end of the second right-side deformable portion 7R4, and is fixed to the right-side plate portion 1A4 by welding. However, the right-side fixed portion 7R5 may also be fixed to other parts of the frame HS, such as the front side plate portion 1A1, the rear side plate portion 1A3, the top plate portion 1B, or the bottom plate 2, by welding or the like. In addition, the first right-side deformable portion 7R2, the right-side fold-back portion 7R3, and the second right-side deformable portion 7R4 are also referred to as the right-side deformable portion 7RT (see reference) as the portion that deforms according to the reciprocating motion of the movable body MB. Figure 3 (Top view).

[0039] The left side portion 6L of the plate-shaped metal component 6 is configured to restrict the permanent magnet 5 (left magnet 5L) attached to the plate-shaped metal component 6 fixed to the central portion 7C from moving to the left relative to the plate-shaped metal component 6. Similarly, the right side portion 6R of the plate-shaped metal component 6 is configured to restrict the permanent magnet 5 (right magnet 5R) attached to the plate-shaped metal component 6 fixed to the central portion 7C from moving to the right relative to the plate-shaped metal component 6. Furthermore, the rear portion 6B of the plate-shaped metal component 6 is configured to restrict the permanent magnet 5 attached to the plate-shaped metal component 6 fixed to the central portion 7C from moving rearward relative to the plate-shaped metal component 6. Finally, the front portion 6F of the plate-shaped metal component 6 is configured to restrict the permanent magnet 5 attached to the plate-shaped metal component 6 fixed to the central portion 7C from moving forward relative to the plate-shaped metal component 6.

[0040] Specifically, the rear portion 6B has a central rear portion 6BC, a left rear portion 6BL, and a right rear portion 6BR, while the front portion 6F has a central front portion 6FC, a left front portion 6FL, and a right front portion 6FR. Furthermore, the left rear portion 6BL and the left front portion 6FL function as left-side stops restricting the movement of the movable body MB to the left (Y1 direction), and the right rear portion 6BR and the right front portion 6FR function as right-side stops restricting the movement of the movable body MB to the right (Y2 direction). Specifically, the left rear portion 6BL and the left front portion 6FL are configured such that when the movable body MB moves a predetermined distance to the left, the left rear portion 6BL and the left front portion 6FL contact the inner surface of the left side plate portion 1A2 of the cylindrical portion 1A, thereby suppressing further leftward movement of the movable body MB. In addition, the right rear side 6BR and the right front side 6FR are configured such that when the movable body MB moves a predetermined distance to the right, the right rear side 6BR and the right front side 6FR come into contact with the inner surface of the right side plate 1A4 of the cylindrical part 1A, which can suppress the movable body MB from moving further to the right.

[0041] Next, refer to Figure 6 , Figure 7 as well as Figure 8 The reciprocating motion of the movable body MB based on the drive unit DM is explained. Figure 6 This is a detailed diagram of the vibration generating device 101. Specifically, Figure 6 The image above is a top view of the vibration generating device 101. Figure 6 The image below is an observation from the X1 side and includes... Figure 6 The above figure shows a longitudinal sectional view of the vibration generating device 101 in an imaginary plane parallel to the YZ plane of the dashed line L1. Specifically, Figure 6 The following diagram shows the state of the vibration generating device 101 in its initial state. The initial state of the vibration generating device 101 refers to the state of the vibration generating device 101 when no current is supplied to the coil 4.

[0042] Figure 7 This is a top view of coil 4, movable body MB (permanent magnet 5 and plate-shaped metal part 6), and support part 7. Specifically, Figure 7 The image above shows the state of the movable body MB when it moves to the left (Y1 direction). Figure 7 The central diagram represents the state of the movable body MB when it is in a neutral position (when it is not moving). Figure 7 The diagram below shows the state of the movable body MB when it moves to the right (Y2 direction). Furthermore, in Figure 7 In the illustration, for the purpose of explanation, the coil 4 and a portion of the support component 7, which are actually hidden and not visible by the movable body MB, are represented by hidden lines (dashed lines).

[0043] Figure 8 This is a front view of the conductive plate-shaped component 3, the coil 4, the movable body MB (permanent magnet 5 and plate-shaped metal component 6), and the supporting component 7. Specifically, Figure 8 The image above shows the state of the movable body MB when it moves to the left (Y1 direction). Figure 8 The central diagram represents the state of the movable body MB when it is in a neutral position (when it is not moving). Figure 8 The diagram below shows the state of the movable body MB when it moves to the right (Y2 direction).

[0044] For example, Figure 6 As shown in the diagram below, the lower half of the left magnet 5L, which constitutes the permanent magnet 5, is magnetized as the N pole, and the upper half is magnetized as the S pole. Similarly, the lower half of the right magnet 5R, which constitutes the permanent magnet 5, is magnetized as the S pole, and the upper half is magnetized as the N pole.

[0045] Furthermore, when current flows from the first end 4A of coil 4 (refer to...) Figure 2 To the second end 4B (refer to) Figure 2 When it flows, the current is like Figure 7 As shown by arrow AR1 in the diagram above, the current flows counterclockwise when viewed from above. In this case, in the initial state, in the wire harness section 4S (left wire harness section 4SL), which is opposite the left magnet 5L in coil 4 in the vertical direction and extends in a straight line in the front-back direction, the current flows from the rear side (X2 side) to the front side (X1 side) when viewed from above. Therefore, as a reaction force of the Lorentz force, a force is applied to the left magnet 5L to move to the left (Y1 direction). In addition, in the initial state, in the wire harness section 4S (right wire harness section 4SR), which is opposite the right magnet 5R in coil 4 in the vertical direction and extends in a straight line in the front-back direction, the current flows from the front side (X1 side) to the rear side (X2 side) when viewed from above. Therefore, as a reaction force of the Lorentz force, a force is applied to move the right magnet 5R to the left (Y1 direction).

[0046] As a result, movable bodies such as MB Figure 6 The hollow arrow AR3 in the image below is being forced to the left (in the Y1 direction), as shown. Figure 7 The above image and Figure 8 As shown in the diagram above, it moves to the left. When the movable body MB has moved a predetermined distance to the left, the left front side 6FL and left rear side 6BL of the plate-shaped metal part 6 come into contact with the inner surface of the left side plate 1A2 of the cylindrical part 1A, restricting further leftward movement of the movable body MB. Additionally, in Figure 7 and Figure 8In the illustration, the position of the left side plate portion 1A2 of the cylindrical portion 1A is indicated by a single-dotted line. In addition, the control unit CTR is typically configured to cause the movable body MB to vibrate in a manner in which the left front side portion 6FL and the left rear side portion 6BL of the plate-shaped metal member 6 do not contact the inner surface of the left side plate portion 1A2 of the cylindrical portion 1A.

[0047] In this case, such as Figure 7 As shown in the figure above, the distance DL1 between the left end LE of the central part 7C and the left fixed part 7L5 in the left-right direction (Y-axis direction) is greater than the distance DL0 in the initial state (refer to the figure above). Figure 7 The central portion is compressed in a smaller manner. In addition, the right elastic support portion 7R extends such that the distance DR1 between the right end RE of the central portion 7C and the right fixed portion 7R5 in the left-right direction (Y-axis direction) is greater than the distance DR0 in the initial state.

[0048] Conversely, when current flows from the second end 4B of coil 4 (refer to...) Figure 2 To the first end 4A (refer to) Figure 2 When it flows, the current is like Figure 7 As shown by arrow AR2 in the diagram below, the current flows clockwise when viewed from above. In this case, in the initial state, in the left wire harness 4SL, which is opposite the left magnet 5L in coil 4 in the vertical direction, the current flows from the front (X1 side) to the rear (X2 side) when viewed from above. Therefore, as a reaction force of the Lorentz force, a force is applied to the left magnet 5L to move to the right (Y2 direction). Additionally, in the initial state, in the right wire harness 4SR, which is opposite the right magnet 5R in coil 4 in the vertical direction, the current flows from the rear (X2 side) to the front (X1 side) when viewed from above. Therefore, as a reaction force of the Lorentz force, a force is applied to move the right magnet 5R to the right (Y2 direction).

[0049] As a result, the movable body MB is subjected to a force to the right (in the Y2 direction), such as Figure 7 The image below and Figure 8 As shown in the diagram below, it moves to the right. When the movable body MB has moved a predetermined distance to the right, the right front side 6FR and right rear side 6BR of the plate-shaped metal part 6 come into contact with the inner surface of the right side plate part 1A4 of the cylindrical part 1A, restricting further rightward movement of the movable body MB. Additionally, in Figure 7 and Figure 8 In the illustration, the position of the right side plate portion 1A4 of the cylindrical portion 1A is indicated by a single-dotted line. Furthermore, the control unit CTR is typically configured to cause the movable body MB to vibrate in a manner where the right front side portion 6FR and the right rear side portion 6BR of the plate-shaped metal member 6 do not contact the inner surface of the right side plate portion 1A4 of the cylindrical portion 1A.

[0050] In this case, such as Figure 7 As shown in the figure below, the distance DL2 between the left end LE of the central part 7C and the left fixed part 7L5 in the left-right direction (Y-axis direction) is greater than the distance DL0 in the initial state (refer to...). Figure 7 The central portion of the central portion 7C is elongated in a larger manner. In addition, the right elastic support portion 7R is compressed such that the distance DR2 between the right end RE of the central portion 7C and the right fixed portion 7R5 in the left-right direction (Y-axis direction) is smaller than the distance DR0 in the initial state.

[0051] The control unit CTR, for example, reverses the direction of the current flowing in the coil 4 repeatedly at a period corresponding to the natural vibration frequency of the support member 7, thereby enabling operation across... Figure 7 The state shown in the central diagram is generated alternately. Figure 7 The state shown in the above figure and Figure 7 The state is shown in the image below.

[0052] Specifically, the control unit CTR becomes the vibration generating device 101 Figure 9 When the state shown in the diagram above is reached, the current supply to coil 4 is stopped. When the current supply to coil 4 is stopped, the Lorentz force and its reaction force disappear. At this time, the movable body MB is pushed back to the right (Y2 direction) by the restoring force of the support member 7. The vibration generating device 101 becomes Figure 9 The same applies when the state shown in the image below is reached.

[0053] Alternatively, the control unit CTR may not reverse the direction of the current flowing through coil 4, but instead switch the supply and stop of the current to coil 4 to make the movable body MB reciprocate in the left and right directions.

[0054] Next, refer to Figure 9 The positional relationship between the conductive plate-shaped component 3, the movable body MB, and the supporting component 7 is explained. Figure 9 This is a top view of the conductive plate-shaped component 3, the movable body MB, and the supporting component 7. Specifically, Figure 9 The image above is a top view of the movable body MB (permanent magnet 5 and plate-shaped metal part 6). Figure 9 The central view is a top view of the movable body MB supported by support member 7. Figure 9 The figure below is a top view showing the positional relationship between the conductive plate-shaped component 3, the movable body MB, and the support component 7.

[0055] like Figure 9As shown in the figure above, a through hole 6H and a notch 6K are formed in the central portion 6C of the plate-shaped metal component 6, exposing a portion of the upper surface of the permanent magnet 5. Furthermore, the notch 6K includes a left notch 6KL exposing a portion of the upper surface of the left magnet 5L, and a right notch 6KR exposing a portion of the upper surface of the right magnet 5R. Additionally, as... Figure 9 As shown in the central view, a through hole 7H and a notch 7K are also formed in the central portion 7C of the support member 7, exposing a portion of the upper surface of the permanent magnet 5. Furthermore, the notch 7K includes a left notch 6KL exposing a portion of the upper surface of the left magnet 5L, and a right notch 6KR exposing a portion of the upper surface of the right magnet 5R. In the example shown, the position of the through hole 7H corresponds to the position of the through hole 6H, and the position of the notch 7K corresponds to the position of the notch 6K.

[0056] Compared to the case where the through hole 6H and notch 6K are not formed in the central portion 6C of the plate-shaped metal component 6, the magnetic flux generated by the permanent magnet 5 can more easily reach the conductive plate-shaped component 3. The same applies to the through hole 7H and notch 7K.

[0057] In addition, such as Figure 8 As shown in the figure below, the conductive plate-shaped member 3 does not have a through hole 6H like the through hole 6H of the plate-shaped metal member 6 or a through hole 7H like the through hole 7H of the support member 7, nor does it have a notch 6K like the notch 6K of the plate-shaped metal member 6 or the notch 7K of the support member 7. Therefore, compared with cases where openings or notches are formed, eddy currents flow more easily through the conductive plate-shaped member 3. In addition, the conductive plate-shaped member 3 is generally flat, without recesses or protrusions, so eddy currents flow more easily compared with cases where it is uneven and has recesses or protrusions.

[0058] In addition, such as Figure 8 As shown in the figure below, the conductive plate-shaped component 3 is configured to have a length LT2 shorter than the length LT1 of the permanent magnet 5 in the X-axis direction, and a width W2 narrower than the width W1 of the permanent magnet 5 in the Y-axis direction. This is to suppress the generation of non-continuous magnetic flux of the permanent magnet 5. In the example shown, the width W2 of the conductive plate-shaped component 3 is set as follows: Figure 2 As shown in the figure above, when the movable body MB (permanent magnet 5) moves a predetermined distance to the left (Y1 side), the position of the right end 3RE of the conductive plate-shaped component 3 in the Y-axis direction is approximately the same as the position of the right end of the permanent magnet 5 (right magnet 5R), and as... Figure 6 As shown in the figure below, when the movable body MB (permanent magnet 5) moves a specified distance to the right (Y2 side), the position of the left end 3LE of the conductive plate-shaped member 3 in the Y-axis direction is approximately the same as the position of the left end of the permanent magnet 5 (left magnet 5L).

[0059] Furthermore, in the illustrated example, if the movable body MB vibrates along the vibration axis VA, the magnetic flux MF generated by the permanent magnet 5 contained within the movable body MB also vibrates along the vibration axis VA. That is, the magnetic flux traversing the conductive plate-shaped member 3 located above the permanent magnet 5 vibrates along the vibration axis VA while maintaining its traversal of the conductive plate-shaped member 3. Therefore, eddy currents flow through the conductive plate-shaped member 3 to reduce the change in the density of the magnetic flux traversing the conductive plate-shaped member 3. In addition, the conductive plate-shaped member 3 is arranged orthogonally to the magnetic flux generated by the permanent magnet 5.

[0060] Therefore, the movable body MB is subjected to a braking force, which originates from eddy currents and acts in the opposite direction to the direction of vibration (movement). Specifically, the movable body MB vibrates under the Lorentz force generated by the drive unit DM, while being subjected to a braking force that slows down this vibration. Moreover, the braking force increases proportionally to the vibration velocity of the movable body MB. Therefore, the vibration acceleration at the natural vibration frequency of the movable body MB and its vibrating frequencies is reduced by its braking force.

[0061] Furthermore, the larger the eddy current, the greater the braking force caused by the eddy current. Additionally, the lower the resistivity (resistivity coefficient) of the conductive plate-shaped component 3, the larger the eddy current; the higher the conductivity of the conductive plate-shaped component 3, and the greater the thickness of the conductive plate-shaped component 3, the larger the eddy current. Therefore, the material and thickness of the conductive plate-shaped component 3 are selected to obtain the desired braking force. In the example shown, the conductive plate-shaped component 3 is formed of the same material as the wire of the coil 4, namely, ductile copper.

[0062] Furthermore, in vibration generating devices, eddy current-based braking forces may become undesirable forces that reduce vibration acceleration. However, a vibration generating device 101 of one embodiment of the present disclosure is configured to suppress resonance of the movable body MB by actively utilizing eddy current-based braking forces.

[0063] With this structure, the vibration generating device 101 can use the braking force caused by the eddy current flowing through the conductive plate-shaped component 3 to suppress the resonance of the movable body MB.

[0064] As mentioned above, such as Figure 6As shown, the vibration generating apparatus 101 of this disclosure includes a fixed body FB, a movable body MB, and a support member 7 that supports the movable body MB so that it can vibrate relative to the fixed body FB along a first direction (Y-axis direction). Furthermore, the fixed body FB includes a coil 4, which has a wire harness portion 4S comprising a plurality of wires extending along a second direction (X-axis direction) perpendicular to the first direction (Y-axis direction), and is disposed on one side (Z2 side, lower side) of the movable body MB in a third direction (Z-axis direction) perpendicular to both the first direction (Y-axis direction) and the second direction (X-axis direction). Additionally, as... Figure 10 As shown in the figure below, the movable body MB includes a permanent magnet 5 that generates a first magnetic flux MF1 in the direction toward the wire harness 4S side (Z2 side, lower side) and a second magnetic flux MF2 in the direction toward the opposite side (Z1 side, upper side) of the wire harness 4S. Additionally, as... Figure 10 As shown in the figure below, the fixed body FB includes a conductive plate-shaped component 3, which is disposed on the other side (Z1 side, upper side) of the movable body MB in the third direction (Z-axis direction) and extends along the first direction (Y-axis direction) in a manner that intersects with the second magnetic flux MF2, generating eddy currents when the movable body MB moves along the first direction (Y-axis direction).

[0065] In this structure, the vibration generating device 101 can suppress the resonance of the movable body MB using the braking force generated by the eddy current flowing through the conductive plate-like component 3. Therefore, compared with structures that suppress resonance using gel-like damping components or sponges, the vibration generating device 101 can achieve the effect of suppressing resonance and improve durability. That is, this structure provides the effect of a vibration generating device 101 with a construction that can suppress the resonance of the movable body MB and has excellent durability.

[0066] Furthermore, compared to structures that suppress resonance using gel-like damping components or sponges, this structure increases the damping coefficient, resulting in a balance between responsiveness and peak acceleration. Additionally, compared to structures that suppress resonance using gel-like damping components or sponges, this structure also suppresses vibration waveform deformation. This is because in structures that suppress resonance using gel-like damping components or sponges, the gel-like damping components or sponges affect the spring constant of the supporting component 7 (leaf spring), making the vibration waveform prone to deformation.

[0067] Furthermore, compared to structures that suppress resonance by providing a magnetic fluid layer in the gap between the coil and the permanent magnet, or in the gap between the frame and the permanent magnet, the vibration generating device 101 offers the advantage of high stability relative to ambient temperature, meaning that it is difficult to produce performance changes caused by changes in ambient temperature.

[0068] Furthermore, this structure is similar to the structure in which a conductive plate-like component 3 and a coil 4 are arranged on one side of the permanent magnet 5 (see reference). Figure 10 Compared to the central and lower diagrams, the distances between the conductive plate-shaped component 3 and the coil 4 and the permanent magnet 5 can be reduced. Therefore, this structure has the following effects: compared to a structure in which the conductive plate-shaped component 3 and the coil 4 are arranged on one side of the permanent magnet 5, the reduction in driving force caused by the interaction between the coil 4 and the permanent magnet 5 can be suppressed, that is, the reduction in thrust constant can be suppressed, and the braking force caused by the eddy current generated by the interaction between the conductive plate-shaped component 3 and the permanent magnet 5 can be increased.

[0069] also, Figure 6 These are diagrams illustrating the differences between the vibration generating apparatus 101 of the embodiments of this disclosure and the vibration generating apparatus 101X and vibration generating apparatus 101Y, which are comparative examples. Specifically, Figure 10 The above figure is a schematic cross-sectional view of the vibration generating device 101, and... Figure 10 The image below corresponds to this. Additionally, Figure 6 The central view is a schematic cross-sectional view of the vibration generating device 101X. Figure 9 The following figure is a schematic cross-sectional view of the vibration generating device 101Y.

[0070] The vibration generating device 101X differs from the vibration generating device 101 in that it has a plate-shaped metal member 6X that functions as a magnetic yoke plate instead of the plate-shaped metal member 6, and a conductive plate-shaped member 3 is disposed on the lower side of the movable body MB and the upper side of the coil 4. Otherwise, it is the same as the vibration generating device 101. Furthermore, since the plate-shaped metal member 6X functions as a magnetic yoke member, it is therefore formed to be thicker than the plate-shaped metal member 6.

[0071] The vibration generating device 101Y differs from the vibration generating device 101 in that it has a plate-shaped metal member 6X that functions as a magnetic yoke instead of the plate-shaped metal member 6, and a conductive plate-shaped member 3 is disposed on the lower side of the movable body MB and the lower side of the coil 4. Otherwise, it is the same as the vibration generating device 101. That is, the vibration generating device 101Y differs from the vibration generating device 101X, where the conductive plate-shaped member 3 is disposed on the lower side of the coil 4, in that the conductive plate-shaped member 3 is disposed on the upper side of the coil 4.

[0072] In vibration generating device 101X, compared to vibration generating device 101, the distance between the conductive plate-shaped member 3 and the permanent magnet 5 remains unchanged, but the distance between the coil 4 and the permanent magnet 5 increases, thus reducing the driving force caused by the interaction between the coil 4 and the permanent magnet 5. On the other hand, in vibration generating device 101Y, compared to vibration generating device 101, the distance between the coil 4 and the permanent magnet 5 remains unchanged, but the distance between the conductive plate-shaped member 3 and the permanent magnet 5 increases, thus reducing the braking force caused by the eddy current generated by the interaction between the conductive plate-shaped member 3 and the permanent magnet 5.

[0073] In contrast, compared to vibration generating devices 101X and 101Y, vibration generating device 101 can simultaneously reduce the distances between the conductive plate member 3 and the coil 4 and the permanent magnet 5. Therefore, compared to vibration generating device 101X, vibration generating device 101 can increase the driving force generated by the interaction between the coil 4 and the permanent magnet 5, and compared to vibration generating device 101Y, it can increase the braking force caused by the eddy current generated by the interaction between the conductive plate member 3 and the permanent magnet 5.

[0074] In addition, such as ​ As shown in the figure below, the vibration generating device 101 may also include a plate-shaped metal component 6 adsorbed onto the upper surface of the permanent magnet 5. That is, the plate-shaped metal component 6 may also be formed of a magnetic metal. In this case, the vibration generating device 101 may also be configured such that the second magnetic flux MF2 passes through the plate-shaped metal component 6 from the upper surface of the permanent magnet 5 toward the conductive plate-shaped component 3. For example, the plate-shaped metal component 6 may also be formed of a non-magnetic metal so as not to block the magnetic flux generated by the permanent magnet 5.

[0075] This structure allows the permanent magnet 5 to be easily mounted on the support member 7 via the plate-shaped metal component 6. This is because the permanent magnet 5 and the plate-shaped metal component 6 are magnetically bonded to each other even without adhesives or the like. Furthermore, this structure provides the following effect: the braking force caused by eddy currents resulting from the interaction between the conductive plate-shaped component 3 and the permanent magnet 5 is reduced by the plate-shaped metal component 6.

[0076] In addition, such as ​ As shown in the figure above, the plate-shaped metal component 6 may also have a through hole 6H or a notch 6K that exposes the upper surface of the permanent magnet 5. In the example shown, a circular through hole 6H that exposes the upper surface of the central part of the permanent magnet 5 is formed in the central part 6C of the plate-shaped metal component 6, a left notch 6KL that exposes the upper surface of the central part of the left end of the left magnet 5L, and a right notch 6KR that exposes the upper surface of the central part of the right end of the right magnet 5R.

[0077] This structure has the following effect: compared with the structure in which no through hole 6H or notch 6K is formed in the central part 6C of the plate-shaped metal component 6, the magnetic flux generated by the permanent magnet 5 can easily reach the conductive plate-shaped component 3, thereby increasing the braking force caused by the eddy current generated by the interaction between the conductive plate-shaped component 3 and the permanent magnet 5.

[0078] Alternatively, the conductive plate-shaped component 3 can also be a component separate from the fixing body FB. That is, the conductive plate-shaped component 3 may not be part of the cover 1 or the base plate 2 constituting the frame HS, but may be a component that is independent of the cover 1 and the base plate 2.

[0079] This structure has the following effect: even when the frame HS is made of a non-conductive material, braking force caused by eddy currents can be used to suppress the resonance of the movable body MB.

[0080] Alternatively, the conductive plate-shaped component 3 can also be made of a non-magnetic metal. This structure provides the following effect: it can prevent the magnetic force (attraction force) between the conductive plate-shaped component 3 and the permanent magnet 5 from acting as it would in the case where the conductive plate-shaped component 3 is made of a magnetic metal, and it can suppress such attraction forces from hindering the efficient utilization of the driving force of the drive unit DM.

[0081] Furthermore, the conductive plate-shaped component 3 can also be formed from a material with a higher conductivity than the fixed body FB. For example, the conductive plate-shaped component 3 can also be formed from a material with a conductivity greater than that of iron or iron alloys. This structure results in an increase in the braking force (force that suppresses vibration) generated by eddy currents. This is because the higher the conductivity, the greater the braking force generated by eddy currents. Therefore, this structure, for example, provides an effect that can suppress the resonance of a heavier movable body MB.

[0082] Alternatively, the conductive plate-shaped component 3 can also be formed from copper or aluminum. For example, the conductive plate-shaped component 3 can also be formed from copper, aluminum, or alloys thereof. This structure offers the following advantage: compared to the case where the conductive plate-shaped component 3 is formed from precious metals such as silver or alloys thereof, material costs can be reduced.

[0083] The preferred embodiments of this disclosure have been 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 various features described with reference to the above embodiments can be appropriately combined as long as they are not technically contradictory.

[0084] This application claims priority based on Japanese Patent Application No. 2023-139211, filed on August 29, 2023, the entire contents of which are incorporated herein by reference.

[0085] Explanation of reference numerals in the attached figures 1. Cover; 1A. Cylindrical section; 1A1. Front side plate; 1A2. Left side plate; 1A3. Rear side plate; 1A4. Right side plate; 1B. Top plate; 2. Bottom plate; 3. Conductive plate-shaped component; 3LE. Left end; 3RE. Right end; 4. Coil; 4A. First end; 4B. Second end; 4S. Wire harness; 4SL. Left wire harness; 4SR. Right wire harness; 5. Permanent magnet; 5L. Left magnet; 5R. Right magnet Magnet; 6, 6X, plate-shaped metal parts; 6B, rear side; 6BC, central rear side; 6BL, left rear side; 6BR, right rear side; 6C, central part; 6F, front side; 6FC, central front side; 6FL, left front side; 6FR, right front side; 6H, through hole; 6K, notch; 6KL, left notch; 6KR, right notch; 6L, left side; 6R, right side; 7, support component; 7C, central part; 7H Through hole; 7K, notch; 7KL, left notch; 7KR, right notch; 7L, left elastic support; 7L1, left upright part; 7L2, first left deformable part; 7L3, left folding part; 7L4, second left deformable part; 7L5, left fixed part; 7LT, left deformable part; 7R, right elastic support; 7R1, right upright part; 7R2, first right deformable part; 7R3, right folding part; 7R4, second right deformable part; 7R5, right fixed part; 7RT, right deformable part; 101, 101X, 101Y, vibration generating device; BM, insulating substrate; CP, top surface; CTR, control unit; DM, drive unit; FB, fixed body; HS, frame; IT, input terminal; LE, left end; MB, movable body; PD1, first conductor pad; PD2, second conductor pad; RE, right end; VA, vibration shaft; VE, vibration device.

Claims

1. A vibration generating device, comprising: Fixed body; Movable bodies; and A support member supports the movable body so that it can vibrate relative to the fixed body along a first direction. The vibration generating device is characterized in that... The fixed body includes a coil having a bundle portion comprising a plurality of wires extending in a second direction perpendicular to the first direction, and is disposed on a third upward side of the movable body perpendicular to both the first and second directions. The movable body includes a permanent magnet that generates a first magnetic flux toward the wire harness portion and a second magnetic flux toward the opposite side of the wire harness portion. The fixed body includes a conductive plate-like component disposed on the other side of the movable body in the third direction and extending along the first direction in a manner intersecting with the second magnetic flux, generating eddy currents when the movable body moves in the first direction.

2. The vibration generating device according to claim 1, characterized in that, The vibration generating device includes a plate-shaped metal component that is adsorbed onto the upper surface of the permanent magnet. The second magnetic flux passes from the upper surface of the permanent magnet through the plate-shaped metal component toward the conductive plate-shaped component.

3. The vibration generating device according to claim 2, characterized in that, The plate-shaped metal component has a through hole or notch that exposes the upper surface of the permanent magnet.

4. The vibration generating device according to claim 1, characterized in that, The conductive plate-shaped component is a separate component from the fixing body.

5. The vibration generating device according to claim 4, characterized in that, The conductive plate-shaped component is formed of a material with a higher conductivity than the fixed body.

6. The vibration generating device according to claim 5, characterized in that, The conductive plate-shaped component is formed of copper or aluminum.

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