Vibration generating device

Abstract

The vibration generating device (101) includes a coil (4) and a magnetic flux source (5). The magnetic flux source (5) includes a left magnet (5L), a first central magnet (5C1), a second central magnet (5C2), and a right magnet (5R). The coil (4) includes a left coil (4L) formed by a left harness portion (4U1L) and a right harness portion (4U1R), and a right coil (4R) formed by a left harness portion (4U3L) and a right harness portion (4U3R). The magnetic flux generated by the first central magnet (5C1) passing through a space (SP1) between the right harness portion (4U1R) of the left coil (4L) and the first central magnet (5C1) in the vertical direction is smaller than the magnetic flux generated by the left magnet (5L) passing through a space (SP2) between the left harness portion (4U1L) of the left coil (4L) and the left magnet (5L) in the vertical direction.

Description

Technical Field

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

[0002] In the past, a linear vibration actuator having a guide portion for holding a movable member (movable body) in a reciprocating manner is known (see Patent Document 1). The guide portion is a component different from the housing accommodated in the housing, and is composed of a pair of guide rail components. A pair of guide grooves (recesses) formed in the pair of guide rail components are configured to engage with a pair of end edges (convex portions) provided on both sides of the movable member. Moreover, the movable member is configured to be able to reciprocate along the guide grooves while being guided by the pair of guide grooves.

[0003] The driving of the movable part is realized by six magnets installed on the movable part and six coils installed on the box body via the coil holding part. Moreover, the six magnets have the same magnetic force strength and are arranged in parallel along the reciprocating direction. In addition, the six coils include three coils arranged above the movable part and three coils arranged below the movable part.

[0004] Prior art literature

[0005] Patent Literature

[0006] Patent Document 1: International Publication No. 2019 / 151232 Summary of the invention

[0007] Problems to be solved by the invention

[0008] In the above-described configuration, when the movable body moves in the reciprocating direction, the strength of the magnetic field passing perpendicularly through the coil changes, and an induced current is generated in a direction that hinders the change, and there is a concern that the driving force (Lorentz force) that moves the movable body may be reduced.

[0009] Therefore, it is desirable to provide a vibration generating device capable of suppressing a reduction in driving force caused by a change in the intensity of a magnetic field passing through a coil.

[0010] Means for solving problems

[0011] The vibration generating device of the embodiment of the present invention comprises: a fixed body; a movable body accommodated in the fixed body; a guiding mechanism for guiding the movable body in such a manner that the movable body can reciprocate in the left-right direction within the fixed body; a magnetic flux source fixed to one of the movable body and the fixed body and generating a magnetic flux in the up-down direction; and a coil fixed to the other of the movable body and the fixed body in such a manner as to intersect the magnetic flux generated by the magnetic flux source, extending in the front-to-back direction and arranged in parallel in the left-to-right direction, and composed of a conductive wire, the magnetic flux source comprising a left magnet, at least one central magnet and a right magnet, the left magnet, at least one central magnet and the right magnet being arranged in parallel in the left-to-right direction, the coil comprising: a left coil composed of a left coil intersecting with the magnetic flux from the left magnet A side wire harness portion, and a right wire harness portion intersecting the magnetic flux from the central magnet; and a right coil, composed of a left wire harness portion intersecting the magnetic flux from the central magnet, and a right wire harness portion intersecting the magnetic flux from the right magnet, the magnetic flux generated by the central magnet penetrating the space between the right wire harness portion of the left coil and the central magnet in the up-down direction is smaller than the magnetic flux generated by the left magnet penetrating the space between the left wire harness portion of the left coil and the left magnet in the up-down direction, and the magnetic flux generated by the central magnet penetrating the space between the left wire harness portion of the right coil and the central magnet in the up-down direction is smaller than the magnetic flux generated by the right magnet penetrating the space between the right wire harness portion of the right coil and the right magnet in the up-down direction.

[0012] Effects of the Invention

[0013] The vibration generating device described above can suppress a decrease in driving force caused by a change in the intensity of the magnetic field passing through the coil. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1A It is a three-dimensional diagram of a vibration generating device.

[0015] Figure 1B It is a top view of the vibration generating device.

[0016] Figure 2 It is an exploded perspective view of the vibration generating device.

[0017] Figure 3A This is a three-dimensional diagram of the entire movable body.

[0018] Figure 3B This is an exploded perspective view of the movable body.

[0019] Figure 4A It is an exploded perspective view of the movable body in a state where the illustration of the magnetic flux source is omitted.

[0020] Figure 4B It is a top view of the movable body attached to the side case.

[0021] Figure 5A It is a detailed view of the components that make up the guide mechanism.

[0022] Figure 5B It is a detailed view of the components that make up the guide mechanism.

[0023] Fig. 6A It is a cross-sectional view of a vibration generating device.

[0024] Figure 6B It is a cross-sectional view of a vibration generating device.

[0025] Fig. 7A It is a perspective view of the components constituting the guide mechanism.

[0026] Figure 7B It is a perspective view of the components constituting the guide mechanism.

[0027] Fig. 8A This is a three-dimensional diagram of the coil fixed to the box.

[0028] Figure 8B This is a top view of the coil fixed to the box.

[0029] Fig. 9A It is a cross-sectional view of the housing, coil, and magnetic flux source.

[0030] Fig. 9B It is a cross-sectional view of the housing, coil, and magnetic flux source.

[0031] Fig. 9C It is a cross-sectional view of the housing, coil, and magnetic flux source.

[0032] Fig. 10A It is a top view of the lower housing, the lower coil, and the magnetic flux source.

[0033] Fig. 10B It is a top view of the lower housing, the lower coil, and the magnetic flux source.

[0034] Fig. 10C It is a top view of the lower housing, the lower coil, and the magnetic flux source.

[0035] Fig.11A It is a cross-sectional view of the housing, coil, and magnetic flux source.

[0036] Fig. 11B It is a cross-sectional view of the housing, coil, and magnetic flux source.

[0037] Fig. 12A This is an enlarged view of the left magnet and the first center magnet.

[0038] Fig. 12BThis is an enlarged view of the left magnet and the first center magnet.

[0039] Fig.13A It is a cross-sectional view of the housing, coil, and magnetic flux source.

[0040] Fig. 13B It is a cross-sectional view of the housing, coil, and magnetic flux source.

[0041] Fig. 13C It is a cross-sectional view of the housing, coil, and magnetic flux source.

[0042] Fig.14 It is a top view of the lower housing, coil, and magnetic flux source. DETAILED DESCRIPTION

[0043] Hereinafter, a vibration generator 101 according to an embodiment of the present invention will be described with reference to the drawings. Figure 1A as well as Figure 1B 1 is an external view of the vibration generating device 101. Specifically, Figure 1A is a three-dimensional diagram of the vibration generating device 101, Figure 1B It is a top view of the vibration generating device 101 . Figure 2 It is an exploded perspective view of the vibration generating device 101.

[0044] Figure 1A , Figure 1B ,as well as Figure 2 Each 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. 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.

[0045] The vibration device VE has a control unit CTR and a vibration generating device 101. The vibration generating device 101 has a housing HS as a fixed body, a movable body MB accommodated in the housing HS, and a coil 4 mounted on the housing HS. The control unit CTR is connected to an input terminal IT provided on an insulating substrate BM fixed to the housing HS. In addition, Figure 1AThe dotted line schematically shows that the control unit CTR is electrically connected to the input terminal IT provided on the insulating substrate BM.

[0046] like Figure 1A As shown, the box HS has a substantially rectangular shape, and is configured so that the area of ​​the surface (upper surface and lower surface) parallel to the XY plane is the largest. In the present embodiment, the box HS is formed of a non-magnetic material such as austenitic stainless steel. However, the box HS may also be formed of a synthetic resin. Alternatively, the box HS may also be formed of a magnetic material. Specifically, the box HS is composed of a shell 1 and a side shell 2.

[0047] like Figure 2 As shown, the housing 1 includes an upper housing 1U forming the top surface of the housing HS, and a lower housing 1D forming the bottom surface of the housing HS. The upper housing 1U and the lower housing 1D are both flat plate-shaped components. In this embodiment, the upper housing 1U and the lower housing 1D have the same shape and the same size. That is, the upper housing 1U and the lower housing 1D are configured as the same component.

[0048] The upper housing 1U is formed to be symmetrical in the front-rear direction and in the left-right direction. The same is true for the lower housing 1D. The upper housing 1U and the lower housing 1D are arranged to be vertically symmetrical to each other.

[0049] The side shell 2 is formed to constitute the side surface of the box body HS. In this embodiment, the side shell 2 has four side plate portions 2A formed in a flat plate shape. Figure 2 As shown, the side plate portion 2A includes a first side plate portion 2A1 and a third side plate portion 2A3 facing each other, and a second side plate portion 2A2 and a fourth side plate portion 2A4 which are perpendicular to the first side plate portion 2A1 and the third side plate portion 2A3 and facing each other.

[0050] The housing 1 is fastened to the side housing 2 by a fastening member 3. Specifically, the fastening member 3 includes an upper fastening member 3U and a lower fastening member 3D. In the present embodiment, the fastening member 3 is configured as an external thread that can be operated by a cross screwdriver, and is configured to engage with the internal thread holes 2T formed at the four corners of the side housing 2. The internal thread holes 2T formed at the four corners of the side housing 2 are formed in a manner that passes through the corners of the side housing 2 along the Z-axis direction, and include a first internal thread hole 2T1 to a fourth internal thread hole 2T4. Moreover, the upper housing 1U is fastened to the side housing 2 by four upper fastening members 3U (a first upper external thread 3U1 to a fourth upper external thread 3U4). Specifically, the first upper side external thread 3U1 is screwed into the upper side opening of the first internal thread hole 2T1 formed at the right front corner of the side case 2, the second upper side external thread 3U2 is screwed into the upper side opening of the second internal thread hole 2T2 formed at the left front corner of the side case 2, the third upper side external thread 3U3 is screwed into the upper side opening of the third internal thread hole 2T3 formed at the left rear corner of the side case 2, and the fourth upper side external thread 3U4 is screwed into the upper side opening of the fourth internal thread hole 2T4 formed at the right rear corner of the side case 2. Similarly, the lower side case 1D is fastened to the side case 2 by four lower side fastening components 3D (first lower side external thread 3D1 to fourth lower side external thread 3D4). Specifically, the first lower side external thread 3D1 is screwed into the lower side opening of the first internal threaded hole 2T1 formed at the right front corner of the side shell 2, the second lower side external thread 3D2 is screwed into the lower side opening of the second internal threaded hole 2T2 formed at the left front corner of the side shell 2, the third lower side external thread 3D3 is screwed into the lower side opening of the third internal threaded hole 2T3 formed at the left rear corner of the side shell 2, and the fourth lower side external thread 3D4 is screwed into the lower side opening of the fourth internal threaded hole 2T4 formed at the right rear corner of the side shell 2.

[0051] The coil 4 is a member constituting the drive mechanism DM. In the present embodiment, the coil 4 is a winding coil formed by winding a conductive wire whose surface is covered with an insulating material, and is configured to be fixed to the housing 1 . Figure 2For the sake of clarity, the illustration of the detailed winding state of the conductive wire is omitted. The same is true in other figures illustrating the coil 4. The coil 4 can also be a stacked coil or a thin film coil, etc. Specifically, the coil 4 includes an upper coil 4U fixed to the surface of the lower side (Z2 side) of the upper shell 1U, and a lower coil 4D fixed to the surface of the upper side (Z1 side) of the lower shell 1D. Moreover, the upper coil 4U includes a first upper coil 4U1, a second upper coil 4U2, and a third upper coil 4U3 arranged in parallel and connected in series along the Y-axis direction, and the lower coil 4D includes a first lower coil 4D1, a second lower coil 4D2, and a third lower coil 4D3 arranged in parallel and connected in series along the Y-axis direction. In addition, hereinafter, the first upper coil 4U1 and the first lower coil 4D1 are also referred to as the left coil 4L, the second upper coil 4U2 and the second lower coil 4D2 are also referred to as the center coil 4C, and the third upper coil 4U3 and the third lower coil 4D3 are also referred to as the right coil 4R.

[0052] The control unit CTR is configured to be able to control the movement of the movable body MB. In the present embodiment, the control unit CTR is a device including an electronic circuit and a non-volatile storage device, etc., and is configured to be able to control the direction and magnitude of the current flowing through the coil 4. The control unit CTR can be configured to control the direction and magnitude of the current flowing through 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 through the coil 4 without receiving a control instruction from an external device. In addition, in the present embodiment, the control unit CTR is disposed outside the housing HS, but can also be disposed inside the housing HS.

[0053] The movable body MB is configured to be able to vibrate the housing HS. In the present embodiment, the movable body MB is configured to be able to vibrate the housing HS by reciprocating in a state of being attached to the housing HS.

[0054] Next, refer to Figure 3A , Figure 3B , Figure 4A ,as well as Figure 4B , the details of the movable body MB are explained. Figure 3A , Figure 3B , Figure 4A ,as well as Figure 4B This is an outline diagram of the movable body MB. Specifically, Figure 3A This is a three-dimensional diagram of the entire movable body MB. Figure 3B It is an exploded perspective view of the movable body MB. Figure 4A It is an exploded perspective view of the movable body MB in a state where the magnetic flux source 5 is omitted from illustration. Figure 4B It is a plan view of the movable body MB attached to the side case 2 .

[0055] The movable body MB includes a magnetic flux source 5 and a magnetic flux source holding member 6, and is elastically supported by an elastic supporting member 7. Specifically, the movable body MB is configured to have a predetermined natural vibration frequency and to move along a vibration axis VA (see Figure 3A ) can reciprocate (vibrate) relative to the housing HS (side housing 2).

[0056] The magnetic flux source 5 is a component constituting the driving mechanism DM, and is configured to generate magnetic flux. In the present embodiment, the magnetic flux source 5 is a permanent magnet, including a left magnet 5L, a central magnet 5C, and a right magnet 5R. The central magnet 5C includes a first central magnet 5C1 and a second central magnet 5C2. The left magnet 5L, the first central magnet 5C1, the second central magnet 5C2, and the right magnet 5R are all permanent magnets magnetized into two poles, and are arranged in parallel along the Y-axis direction.

[0057] The magnetic flux source holding member 6 is configured to hold the magnetic flux source 5. In the present embodiment, the magnetic flux source holding member 6 is a rectangular frame-shaped member formed of synthetic resin, and is configured to hold the left magnet 5L, the first central magnet 5C1, the second central magnet 5C2, and the right magnet 5R at substantially equal intervals in the Y-axis direction.

[0058] The elastic support member 7 is configured to be sandwiched between the box body HS and the movable body MB and to be able to elastically support the movable body MB. In the present embodiment, the elastic support member 7 is a U-shaped leaf spring formed of a metal plate, including a left leaf spring 7L fixed to the left end of the magnetic flux source holding member 6, and a right leaf spring 7R fixed to the right end of the magnetic flux source holding member 6.

[0059] The fastening member 8 is a member for fastening the elastic support member 7 to the magnetic flux source holding member 6. In the present embodiment, the fastening member 8 is configured as an external thread that can be operated by a flat-blade screwdriver, and is configured to engage with the internal thread hole 6T formed in the magnetic flux source holding member 6. Specifically, the fastening member 8 includes a left external thread 8L for fastening the left leaf spring 7L to the left end portion of the magnetic flux source holding member 6, and a right external thread 8R for fastening the right leaf spring 7R to the right end portion of the magnetic flux source holding member 6.

[0060] like Figure 4A As shown, the fastening member 8 passes through the through hole 2H (see Figure 2 ) and the through hole 7H formed in the elastic support member 7, and is fastened to the internal thread hole 7T formed in the elastic support member 7 and the internal thread hole 6T formed in the magnetic flux source holding member 6. Specifically, the left external thread 8L passes through the left through hole 2HL (refer to Figure 2) and the left through hole 7HL formed in the left leaf spring 7L, and is screwed into the left internal thread hole 7TL formed in the left leaf spring 7L and the left internal thread hole 6TL formed in the left end of the magnetic flux source holding member 6. Similarly, the right external thread 8R passes through the right through hole 2HR (refer to Figure 2 ) and the right through hole 7HR formed in the right leaf spring 7R, and are screwed into the right internal threaded hole 7TR formed in the right leaf spring 7R and the right internal threaded hole 6TR formed in the right end portion of the magnetic flux source holding component 6.

[0061] The side case 2 is configured such that the elastic support member 7 is fixed to the side case 2 without using a fastening member. Figure 4B As shown, the side case 2 has a protrusion 2P formed to be able to clamp the outer end of the elastic support member 7. More specifically, the side case 2 has a left protrusion 2PL formed to be able to clamp the left end of the left leaf spring 7L, and a right protrusion 2PR formed to be able to clamp the right end of the right leaf spring 7R. The left end of the left leaf spring 7L is inserted between the inner surface of the second side plate 2A2 and the left protrusion 2PL and fixed, and the right end of the right leaf spring 7R is inserted between the inner surface of the fourth side plate 2A4 and the right protrusion 2PR and fixed.

[0062] The driving mechanism DM is an example of a vibration force generating unit, and is configured to enable the movable body MB to vibrate along the vibration axis VA. In the present embodiment, the driving mechanism DM is composed of a coil 4 and a magnetic flux source 5, and is configured to enable the movable body MB (magnetic flux source 5) elastically supported by the elastic supporting member 7 to vibrate along the vibration axis VA by utilizing the electromagnetic force acting between the coil 4 and the magnetic flux source 5 in accordance with the direction and magnitude of the current supplied to the coil 4 by the control unit CTR.

[0063] Next, refer to Figure 5A , Figure 5B , Fig. 6A , Figure 6B , Fig. 7A ,as well as Figure 7B The guide mechanism GM will be described. Figure 5A as well as Figure 5B Detailed diagram of the components constituting the guide mechanism GM. Specifically, Figure 5A It is a left side view of the upper case 1U, the lower case 1D, the side case 2, and the magnetic flux source holding member 6 in an exploded state. Figure 5B FIG. 1 is a left side view of the upper housing 1U, the lower housing 1D, and the magnetic flux source holding member 6 in the assembled state. Figure 5A as well as Figure 5B In the figure, for the sake of clarity, a fine dot pattern is added to the housing 1 and the side housing 2, and a coarse dot pattern is added to the magnetic flux source holding member 6. Figure 5B For clarity, the Figure 5A FIG. 2 is an illustration of the side shell 2 already illustrated in FIG. Fig. 6A as well as Figure 6B is a cross-sectional view of the vibration generating device 101. Specifically, Fig. 6A is viewed from the Y1 side. Figure 1B The diagram is a cross-sectional view of the vibration generator 101 in a plane parallel to the XZ plane, as shown by the single-dot chain line L1. Figure 6B It is omitted Fig. 6A FIG. 4 is a diagram showing a schematic diagram of the coil 4 and the magnetic flux source 5 . Fig. 7A as well as Figure 7B 2 is a perspective view of the components constituting the guide mechanism GM. Specifically, Fig. 7A It is a perspective view of the upper case 1U, the lower case 1D, and the magnetic flux source holding member 6 in an assembled state. Figure 7B FIG. 2 is a perspective view of the lower housing 1D and the magnetic flux source holding member 6 in an assembled state. Fig. 7A as well as Figure 7B In the figure, a rough dot pattern is added to the magnetic flux source holding member 6 for clarity. Figure 7B , a state in which the magnetic flux source 5 is held by the magnetic flux source holding member 6 is shown.

[0064] The guide mechanism GM is configured to guide the movable body MB in such a manner that the movable body MB can reciprocate in the left-right direction (Y-axis direction) in the housing HS as a fixed body. In the present embodiment, the guide mechanism GM includes an upper guide portion 1UG formed integrally with the upper housing 1U and extending downward (in the Z2 direction) from the upper housing 1U, and a lower guide portion 1DG formed integrally with the lower housing 1D and extending upward (in the Z1 direction) from the lower housing 1D. Furthermore, the guide mechanism GM is configured so that the protruding portion formed in the magnetic flux source holding member 6 constituting the movable body MB, i.e., the guided portion 6G, is slidably guided in the left-right direction by the upper guide portion 1UG and the lower guide portion 1DG.

[0065] Specifically, the upper guide portion 1UG includes a first side plate portion 2A1 (see Figure 2 ) and extending in the Y-axis direction, and the upper front guide portion 1UGF and the third side plate portion 2A3 (see Figure 2 ) and extending in the Y-axis direction. Similarly, the lower guide portion 1DG includes a first side plate portion 2A1 (see Figure 2 ) and extending in the Y-axis direction, and the lower front guide portion 1DGF and the third side plate portion 2A3 (see Figure 2 ) and extending in the Y-axis direction.

[0066] The guided portion 6G formed in the magnetic flux source holding member 6 includes a first side plate portion 2A1 (see Figure 2 ) and extending in the Y-axis direction, and the front side guided portion 6GF and the third side plate portion 2A3 (see Figure 2 ) and a rear side guided portion 6GB extending in the Y-axis direction.

[0067] Moreover, if Figure 5B As shown, the front end of the upper front guide 1UGF and the front end of the lower front guide 1DGF are combined in a manner opposite to each other with the front guided portion 6GF in between, and the front end of the upper rear guide 1UGB and the front end of the lower rear guide 1DGB are combined in a manner opposite to each other with the rear guided portion 6GB in between.

[0068] In the present embodiment, the front end of the upper front guide 1UGF and the front end of the lower front guide 1DGF are combined in contact with the front guided portion 6GF. That is, the front guided portion 6GF is configured to have a shape substantially the same as the space formed between the front end of the upper front guide 1UGF and the front end of the lower front guide 1DGF. Specifically, the front guided portion 6GF is formed as a roughly rectangular protrusion extending continuously in most of the entire length in the longitudinal direction of the magnetic flux source holding component 6. However, the front guided portion 6GF may also be a combination of a plurality of protrusions intermittently arranged along the longitudinal direction of the magnetic flux source holding component 6. The same is true for the rear guided portion 6GB. In addition, in the present embodiment, the magnetic flux source holding component 6 is formed to be symmetrical front and rear. That is, the front guided portion 6GF and the rear guided portion 6GB are formed to have the same shape and the same size. However, the front guided portion 6GF and the rear guided portion 6GB may also have different shapes.

[0069] exist Figure 5A as well as Figure 5B In the example shown, the magnetic flux source holding component 6 is configured so that, when combined with the shell 1 and the side shell 2, the upper surface FS1 of the front side guided portion 6GF contacts the front end surface FS2 of the upper front side guide portion 1UGF, and the lower surface FS3 of the front side guided portion 6GF contacts the front end surface FS4 of the lower front side guide portion 1DGF. In addition, the magnetic flux source holding component 6 is configured so that the upper front surface FS5 (the portion of the front surface located above the front side guided portion 6GF) contacts the inner surface FS6 of the upper front side guide portion 1UGF, and the lower front surface FS7 (the portion of the front surface located below the front side guided portion 6GF) contacts the inner surface FS8 of the lower front side guide portion 1DGF. On the other hand, the magnetic flux source holding component 6 is configured so that the front surface FS9 of the front side guided portion 6GF does not contact the inner surface FS10 (refer to the inner surface FS10 of the first side plate portion 2A1 of the side shell 2) Fig. 6A In addition, the housing 1 is configured such that the outer surface FS11 of the upper front guide portion 1UGF contacts the inner surface FS10 of the first side plate portion 2A1 of the side housing 2, and the outer surface FS12 of the lower front guide portion 1DGF contacts the inner surface FS10 of the first side plate portion 2A1 of the side housing 2.

[0070] Similarly, the magnetic flux source holding component 6 is configured so that, when combined with the shell 1 and the side shell 2, the upper surface BS1 of the rear guided portion 6GB contacts the front end surface BS2 of the upper rear guide portion 1UGB, and the lower surface BS3 of the rear guided portion 6GB contacts the front end surface BS4 of the lower rear guide portion 1DGB. In addition, the magnetic flux source holding component 6 is configured so that the upper rear surface BS5 (the portion of the rear surface located above the rear guided portion 6GB) contacts the inner surface BS6 of the upper rear guide portion 1UGB, and the lower rear surface BS7 (the portion of the rear surface located below the rear guided portion 6GB) contacts the inner surface BS8 of the lower rear guide portion 1DGB. On the other hand, the magnetic flux source holding component 6 is configured so that the rear surface BS9 of the rear guided portion 6GB does not contact the inner surface BS10 (refer to the inner surface BS10 of the third side plate portion 2A3 of the side shell 2) Fig. 6A In addition, the housing 1 is configured such that the outer surface BS11 of the upper rear guide portion 1UGB contacts the inner surface BS10 of the third side plate portion 2A3 of the side housing 2, and the outer surface BS12 of the lower rear guide portion 1DGB contacts the inner surface BS10 of the third side plate portion 2A3 of the side housing 2.

[0071] As described above, the guided portion 6G is configured to be able to move along the upper guide portion 1UG and the lower guide portion 1DG. Fig. 7A as well as Figure 7B Specifically, the guided portion 6G is configured to reciprocate in the left-right direction (Y-axis direction) while its upper surface contacts the front end surface of the upper guide portion 1UG and its lower surface contacts the front end surface of the lower guide portion 1DG.

[0072] With this configuration, the movement of the magnetic flux source holding member 6 in the front-rear direction and the up-down direction is restricted, while smooth movement in the left-right direction is permitted.

[0073] Next, refer to Fig. 8A , Figure 8B , Figures 9A to 9C as well as Figures 10A to 10C The details of the drive mechanism DM will be described. Fig. 8A as well as Figure 8B Detailed diagram of the coil 4 fixed to the housing HS as a fixed body. Fig. 8A It is a perspective view of the lower coil 4D fixed to the lower case 1D. Figure 8B 1D is a top view of the lower coil 4D fixed to the lower housing 1D. Fig. 8A as well as Figure 8B In the figure, a dot pattern is added to the lower coil 4D for clarity. Figures 9A to 9C is viewed from the X1 side and includes Fig. 7A The cross-section of the housing 1, the coil 4, and the magnetic flux source 5 in the virtual plane parallel to the YZ plane of the single-dot chain line L2 shown. Specifically, Fig. 9A It is a cross-sectional view of the housing 1 , the coil 4 , and the magnetic flux source 5 when the movable body MB (magnetic flux source 5 ) is located at the center of the movable range. Fig. 9B It is a cross-sectional view of the housing 1 , the coil 4 , and the magnetic flux source 5 when the movable body MB (magnetic flux source 5 ) is located at the right end of the movable range. Fig. 9C 2 is a cross-sectional view of the housing 1, the coil 4, and the magnetic flux source 5 when the movable body MB (magnetic flux source 5) is located at the left end of the movable range. Figures 9A to 9C In the figure, for the sake of clarity, a coarse cross pattern is added to the N-pole portion and a fine cross pattern is added to the S-pole portion of the permanent magnet serving as the magnetic flux source 5 instead of a pattern showing a cross section. The same is true for the other figures. Figures 10A to 10C 1 is a top view of the magnetic flux source 5 that can move in the left-right direction (Y-axis direction) on the lower coil 4D fixed to the lower housing 1D. Specifically, Fig. 10A It is a plan view of the lower housing 1D, the lower coil 4D, and the magnetic flux source 5 when the movable body MB (magnetic flux source 5) is located at the center of the movable range. Fig. 10B It is a plan view of the lower case 1D, the lower coil 4D, and the magnetic flux source 5 when the movable body MB (magnetic flux source 5) is located at the right end of the movable range. Fig. 10C It is a plan view of the lower case 1D, the lower coil 4D, and the magnetic flux source 5 when the movable body MB (magnetic flux source 5) is located at the left end of the movable range.

[0074] In addition, Figures 9A to 9C as well as Figures 10A to 10C In the figure, for the sake of clarity, the telescopic state of the elastic supporting member 7 is schematically shown by a figure representing a spring.

[0075] like Figure 2 As shown, the coil 4 as one of the components of the drive mechanism DM includes an upper coil 4U fixed to the lower side (Z2 side) surface of the upper case 1U and a lower coil 4D fixed to the upper side (Z1 side) surface of the lower case 1D.

[0076] like Fig. 8A as well as Figure 8BAs shown, the lower coil 4D includes three coils (a first lower coil 4D1, a second lower coil 4D2, and a third lower coil 4D3) fixed to the upper surface (the surface on the Z1 side) of the lower case 1D by an adhesive. Fig. 8A as well as Figure 8B The following description is about the lower coil 4D, but is also applicable to the upper coil 4U. This is because the upper case 1U and the lower case 1D have the same shape and the same size, and the upper coil 4U and the lower coil 4D have the same shape and the same size.

[0077] like Figure 2 as well as Figure 8B As shown, a substantially rectangular lower protrusion 1DP protruding upward (in the Z1 direction) is formed on the upper surface of the lower housing 1D. Specifically, the lower protrusion 1DP includes a left lower protrusion 1DPL for holding the first lower coil 4D1, a central lower protrusion 1DPC for holding the second lower coil 4D2, and a right lower protrusion 1DPR for holding the third lower coil 4D3.

[0078] The first lower coil 4D1 includes a left harness portion 4D1L located on the left side (Y1 side) of the left lower protrusion 1DPL and extending along the left lower protrusion 1DPL, and a right harness portion 4D1R located on the right side (Y2 side) of the left lower protrusion 1DPL and extending along the left lower protrusion 1DPL. The harness portion refers to a portion of the conductive wire constituting the coil extending in the front-rear direction (X-axis direction).

[0079] exist Figure 8B For clarity, a finer dot pattern is added to the left harness portion 4D1L and the right harness portion 4D1R of the first lower coil 4D1 than to the other portions of the first lower coil 4D1. The same is true for the second lower coil 4D2 and the third lower coil 4D3.

[0080] The second lower coil 4D2 includes a left harness portion 4D2L located on the left side (Y1 side) of the central lower protrusion 1DPC and extending along the central lower protrusion 1DPC, and a right harness portion 4D2R located on the right side (Y2 side) of the central lower protrusion 1DPC and extending along the central lower protrusion 1DPC.

[0081] Similarly, the third lower coil 4D3 includes a left harness portion 4D3L located on the left side (Y1 side) of the right lower protrusion 1DPR and extending along the right lower protrusion 1DPR, and a right harness portion 4D3R located on the right side (Y2 side) of the right lower protrusion 1DPR and extending along the right lower protrusion 1DPR.

[0082] The left harness portion 4D1L and the right harness portion 4D1R of the first lower coil 4D1 are portions through which the magnetic flux generated by the magnetic flux source 5 passes, that is, portions that generate a driving force based on the Lorentz force for moving the movable body MB in the left-right direction. The same is true for the left harness portion 4D2L and the right harness portion 4D2R of the second lower coil 4D2, and the left harness portion 4D3L and the right harness portion 4D3R of the third lower coil 4D3.

[0083] like Figures 9A to 9C As shown in FIG. 1 , another magnetic flux source 5 as a component of the driving mechanism DM is configured to be movable in the left-right direction (Y-axis direction) in the space between the upper coil 4U and the lower coil 4D. Specifically, the magnetic flux source 5 includes a left magnet 5L, a first central magnet 5C1, a second central magnet 5C2, and a right magnet 5R. The left magnet 5L, the first central magnet 5C1, the second central magnet 5C2, and the right magnet 5R are respectively Figures 9A to 9C The magnetic flux source holding members 6 (not shown) are held at a predetermined interval from each other.

[0084] like Fig. 9B As shown, in this embodiment, the left magnet 5L is configured such that its width W1 is substantially the same as the width W2 of the right magnet 5R. In addition, the first central magnet 5C1 is configured such that its width W3 is substantially the same as the width W4 of the second central magnet 5C2. In addition, the left magnet 5L is configured such that its width W1 is substantially half of the width W3 of the first central magnet 5C1.

[0085] In the present embodiment, the six coils constituting the coil 4 are configured to have the same shape and the same size. That is, the width W5 of the left harness portion 4U1L of the first upper coil 4U1, the width W6 of the right harness portion 4U1R of the first upper coil 4U1, the width W7 of the left harness portion 4U2L of the second upper coil 4U2, the width W8 of the right harness portion 4U2R of the second upper coil 4U2, the width W9 of the left harness portion 4U3L of the third upper coil 4U3, the width W10 of the right harness portion 4U3R of the third upper coil 4U3, the width W11 of the first lower coil 4U1, the width W12 of the left harness portion 4U3L of the third upper coil 4U3, the width W13 of the right harness portion 4U3R of the third upper coil 4U3, the width W14 of the left harness portion 4U3L of the third upper coil 4U3, the width W15 of the right harness portion 4U3R of the third upper coil 4U3, the width W16 of the left harness portion 4U3L of the third upper coil 4U3, the width W17 of the right harness portion 4U3R of the third upper coil 4U3, the width W18 of the left harness portion 4U3L of the third upper coil 4U3, the width W19 of the right harness portion 4U3R of the third upper coil 4U3, the width W20 of the left harness portion 4U3L of the third upper coil 4U3, the width W21 of the right harness portion 4U3R of the third upper coil 4U3, the width W30 of the left harness portion 4U3L of the third upper coil 4U3, the width W40 of the right harness portion 4U3R of the third upper coil 4U3, the width W5 of the left harness portion 4U3L of the third upper coil The width W11 of the left wire harness portion 4D1L of 4D1, the width W12 of the right wire harness portion 4D1R of the first lower coil 4D1, the width W13 of the left wire harness portion 4D2L of the second lower coil 4D2, the width W14 of the right wire harness portion 4D2R of the second lower coil 4D2, the width W15 of the left wire harness portion 4D3L of the third lower coil 4D3, and the width W16 of the right wire harness portion 4D3R of the third lower coil 4D3 are all the same size.

[0086] The left magnet 5L is configured such that its width W1 is substantially the same as the width W5 of the left harness portion 4U1L of the first upper coil 4U1. The first central magnet 5C1 is configured such that its width W3 is substantially the same as the sum of the width W6 of the right harness portion 4U1R of the first upper coil 4U1 and the width W7 of the left harness portion 4U2L of the second upper coil 4U2.

[0087] like Fig. 9A As shown, when the movable body MB (magnetic flux source 5) is located at the center of the movable range, the left magnet 5L is arranged so that the N-pole portion (upper portion) faces the left-side harness portion 4U1L of the first upper coil 4U1, and the S-pole portion (lower portion) faces the left-side harness portion 4D1L of the first lower coil 4D1. In addition, the first central magnet 5C1 is arranged so that the S-pole portion (upper portion) faces the right-side harness portion 4U1R of the first upper coil 4U1 and the left-side harness portion 4U2L of the second upper coil 4U2, respectively, and the N-pole portion (lower portion) faces the right-side harness portion 4D1R of the first lower coil 4D1 and the left-side harness portion 4D2L of the second lower coil 4D2, respectively. The second central magnet 5C2 is arranged so that its N-pole portion (upper portion) is opposed to the right harness portion 4U2R of the second upper coil 4U2 and the left harness portion 4U3L of the third upper coil 4U3, and its S-pole portion (lower portion) is opposed to the right harness portion 4D2R of the second lower coil 4D2 and the left harness portion 4D3L of the third lower coil 4D3. The right magnet 5R is arranged so that its S-pole portion (upper portion) is opposed to the right harness portion 4U3R of the third upper coil 4U3, and its N-pole portion (lower portion) is opposed to the right harness portion 4D3R of the third lower coil 4D3.

[0088] If Fig. 10B If the current flows in the lower coil 4D as shown by the dotted arrow, the movable body MB (magnetic flux source 5) slides in the right direction (Y2 direction) while being guided by the guide mechanism GM. Specifically, if the current flows counterclockwise in the first lower coil 4D1 when viewed from above, the current flows clockwise in the second lower coil 4D2 when viewed from above, and the current flows counterclockwise in the third lower coil 4D3 when viewed from above, the movable body MB (magnetic flux source 5) slides in the right direction (Y2 direction).

[0089] This is because the Lorentz force acts on the charged particles moving in the conductive wire constituting the lower coil 4D fixed to the lower housing 1D, and its reaction force causes the left magnet 5L, the first central magnet 5C1, the second central magnet 5C2, and the right magnet 5R, which are the magnetic flux source 5, to move rightward.

[0090] Similarly, if Fig. 10CIf the current flows in the lower coil 4D as shown by the dotted arrow, the movable body MB (magnetic flux source 5) slides in the left direction (Y1 direction) while being guided by the guide mechanism GM. Specifically, if the current flows clockwise in the first lower coil 4D1 when viewed from above, the current flows counterclockwise in the second lower coil 4D2 when viewed from above, and the current flows clockwise in the third lower coil 4D3 when viewed from above, the movable body MB (magnetic flux source 5) slides in the left direction (Y1 direction).

[0091] If the movable body MB (magnetic flux source 5) slides in the right direction (Y2 direction), the right leaf spring 7R fixed to the right end of the movable body MB (magnetic flux source holding component 6) contracts. When the force that wants to move the movable body MB in the right direction disappears, that is, when the current flowing through the coil 4 disappears, the contracted right leaf spring 7R generates a restoring force that wants to return the movable body MB to the center of the movable range (a restoring force that wants to push the movable body MB back to the left direction). On the contrary, if the movable body MB (magnetic flux source 5) slides in the right direction (Y2 direction), the left leaf spring 7L fixed to the left end of the movable body MB (magnetic flux source holding component 6) extends. When the force that wants to move the movable body MB in the right direction disappears, that is, when the current flowing through the coil 4 disappears, the extended left leaf spring 7L generates a restoring force that wants to return the movable body MB to the center of the movable range (a restoring force that wants to pull the movable body MB back to the left direction). The same applies to the case where the movable body MB (magnetic flux source 5 ) slides in the left direction (Y1 direction).

[0092] Therefore, when the supply of current to coil 4 stops, movable body MB at a position deviated from the center of the movable range returns to the center of the movable range by the restoring force of elastic support member 7. In this way, drive mechanism DM can vibrate movable body MB in the left-right direction.

[0093] Next, refer to Fig.11A as well as Fig. 11B The magnetic flux source 5 will be described in detail. Fig.11A as well as Fig. 11B is a cross-sectional view of the housing 1, the coil 4, and the magnetic flux source 5, corresponding to Fig. 9A Specifically, Fig.11A It is a cross-sectional view of the housing 1 , the coil 4 , and the magnetic flux source 5 when the movable body MB (magnetic flux source 5 ) in the vibration generator 101 is located at the center of the movable range. Fig. 11B It is a cross-sectional view of the housing 1, the coil 4, and the magnetic flux source 5 in the vibration generating device 101X as a reference example.

[0094] The vibration generating device 101 is different from the vibration generating device 101X in that the height H1 of the central magnet 5C is smaller than the height H2 of the left magnet 5L and the right magnet 5R, that is, the gap (distance) between the coil 4 and the central magnet 5C is larger than the gap (distance) between the coil 4 and the left magnet 5L and the right magnet 5R, respectively. The other points are the same as the vibration generating device 101. Therefore, the description of the common parts is omitted below, and the different parts are described in detail.

[0095] In the vibration generating device 101X, the magnetic flux source 5 is configured such that the height H11 of the central magnet 5C is the same as the height H12 of the left magnet 5L and the right magnet 5R. That is, the magnetic flux source 5 is configured such that the distance between the coil 4 and the central magnet 5C is the same as the distance between the coil 4 and the left magnet 5L and the right magnet 5R. In this case, the strength of the magnetic field of the wire harness passing through the coil 4 becomes uneven depending on the position. In addition, Fig.11A as well as Fig. 11B In FIG. 4 , for the sake of clarity, the strength of the magnetic field passing through the coil 4 is represented by the density of the dot pattern added to the cross section of the coil 4. Specifically, Fig.11A as well as Fig. 11B , it is shown that the finer the dot pattern added to the cross section of the coil 4, the stronger the magnetic field.

[0096] More specifically, Fig.11A It is shown that the strength of the magnetic fields respectively passing through the left side wire harness portion 4U1L and the right side wire harness portion 4U1R of the first upper coil 4U1, the left side wire harness portion 4U2L and the right side wire harness portion 4U2R of the second upper coil 4U2, the left side wire harness portion 4U3L and the right side wire harness portion 4U3R of the third upper coil 4U3, the left side wire harness portion 4D1L and the right side wire harness portion 4D1R of the first lower coil 4D1, the left side wire harness portion 4D2L and the right side wire harness portion 4D2R of the second lower coil 4D2, and the left side wire harness portion 4D3L and the right side wire harness portion 4D3R of the third lower coil 4D3 are all of the same degree.

[0097] In contrast, Fig. 11BThe magnetic flux density passing through the right side portion of the right side harness portion 4U1R of the first upper coil 4U1, the left side portion of the left side harness portion 4U2L of the second upper coil 4U2, the right side portion of the right side harness portion 4U2R of the second upper coil 4U2, the left side portion of the left side harness portion 4U3L of the third upper coil 4U3, the right side portion of the right side harness portion 4D1R of the first lower coil 4D1, the left side portion of the left side harness portion 4D2L of the second lower coil 4D2, the right side portion of the right side harness portion 4D2R of the second lower coil 4D2, and the left side portion of the left side harness portion 4D3L of the third lower coil 4D3 is shown to be higher than the magnetic flux density passing through other harness portions of the coil 4. Hereinafter, the portion with relatively high magnetic flux density in the coil 4 is referred to as a "magnetic flux concentration portion".

[0098] exist Fig. 11B In the vibration generating device 101X shown, if the movable body MB (magnetic flux source 5) moves to the right, the magnetic flux concentrated portion also moves to the left. Therefore, the strength of the magnetic field passing through the right harness portion 4U1R of the first upper coil 4U1, the left harness portion 4U2L and the right harness portion 4U2R of the second upper coil 4U2, the left harness portion 4U3L of the third upper coil 4U3, the right harness portion 4D1R of the first lower coil 4D1, the left harness portion 4D2L and the right harness portion 4D2R of the second lower coil 4D2, and the left harness portion 4D3L of the third lower coil 4D3 changes according to the movement of the movable body MB (magnetic flux source 5). As a result, due to the electromagnetic induction caused by the change in the magnetic field strength (magnetic flux density), an induced electromotive force is generated in the coil 4, which hinders the movement of the movable body MB to the right. The same is true for the case where the movable body MB (magnetic flux source 5) moves to the left.

[0099] On the other hand, Fig.11A In the vibration generating device 101 shown, since it is configured not to generate a magnetic flux concentration portion, even if the movable body MB (magnetic flux source 5) moves in the left-right direction, the intensity of the magnetic field passing through the wire harness portion of the coil 4 does not change sharply, and an excessive induced electromotive force caused by a change in the magnetic field intensity (magnetic flux density) is not generated, and the movement of the movable body MB is not excessively hindered. Fig.11A In the example shown, the generation of the magnetic flux concentration portion is achieved by configuring the height H1 of the central magnet 5C (the first central magnet 5C1 and the second central magnet 5C2) to be smaller than the height H2 of each of the left magnet 5L and the right magnet 5R.

[0100] Here, refer to Fig. 12A as well as Fig. 12B The reason why the magnetic flux concentration portion is generated is explained. Fig. 12A as well as Fig. 12BThis is an enlarged view of the left magnet 5L facing the left harness portion 4U1L of the first upper coil 4U1, the right harness portion 4U1R of the first upper coil 4U1, and the first central magnet 5C1 facing the left harness portion 4U2L of the second upper coil 4U2. Fig. 12A yes Fig.11A An enlarged view of the range R1 surrounded by a single-dot chain line in FIG. Fig. 12B yes Fig. 11B An enlarged view of a range R2 surrounded by a single-dot chain line in FIG. Fig. 12A as well as Fig. 12B The dotted line in Schematically represents a portion of the magnetic flux extending from the magnetic flux source 5.

[0101] like Fig. 12A as well as Fig. 12B As shown in FIG. 1 , the magnetic flux extending from the left magnet 5L is formed so that the magnetic flux extending from a position closer to the left end of the left magnet 5L expands more toward the left, and the magnetic flux extending from a position closer to the right end of the left magnet 5L expands more toward the right. That is, the magnetic flux extending from the left magnet 5L is formed so that the magnetic flux extending from a position closer to the center of the left magnet 5L extends more straightly along the Z axis and vertically passes through the left harness portion 4U1L.

[0102] Similarly, the magnetic flux extending from the first central magnet 5C1 is formed so that the magnetic flux extending from a position closer to the left end of the first central magnet 5C1 expands more toward the left, and the magnetic flux extending from a position closer to the right end of the first central magnet 5C1 expands more toward the right. That is, the magnetic flux extending from the first central magnet 5C1 is formed so that the magnetic flux extending from a position closer to the center of the first central magnet 5C1 extends more straightly along the Z axis, and vertically passes through the right harness portion 4U1R and the left harness portion 4U2L, respectively.

[0103] Therefore, if Fig. 12B As shown, in the vibration generating device 101X, since the gap between the right harness portion 4U1R and the first central magnet 5C1 is smaller than that in the vibration generating device 101, the magnetic flux passing vertically through the right side portion of the right harness portion 4U1R increases, thereby generating a magnetic flux concentration portion. The same is true for the left side portion of the left harness portion 4U2L.

[0104] Therefore, the vibration generating device 101 is constructed to reduce the magnetic flux passing vertically through the right side portion of the right side harness portion 4U1R by making the height H1 of the first central magnet 5C1 smaller than the height H2 of the left side magnet 5L, that is, by increasing the gap between the first central magnet 5C1 and the right side harness portion 4U1R compared to the gap between the left side magnet 5L and the left side harness portion 4U1L.

[0105] Specifically, in Fig. 12B In the vibration generating device 101X shown, the magnetic flux generated by the first central magnet 5C1 and passing through the space SP1X between the right harness portion 4U1R and the first central magnet 5C1 in the vertical direction is larger than the magnetic flux generated by the left magnet 5L and passing through the space SP2 between the left harness portion 4U1L and the left magnet 5L in the vertical direction. This is because the magnetic flux that does not pass through the upper surface of the space SP2 but passes through the right side surface of the space SP2 and extends to the right is larger than the magnetic flux that does not pass through the upper surface of the space SP1X but passes through the right side surface of the space SP1X and extends to the right.

[0106] In contrast, Fig. 12A The vibration generating device 101 shown is configured such that the magnetic flux generated by the first central magnet 5C1 and penetrating the space SP1 between the right harness portion 4U1R and the first central magnet 5C1 in the vertical direction is smaller than the magnetic flux generated by the left magnet 5L and penetrating the space SP2 between the left harness portion 4U1L and the left magnet 5L in the vertical direction. That is, Fig. 12A The vibration generator 101 shown is configured so that more magnetic flux passes through the left side surface of the space SP1 and extends to the left instead of passing through the upper surface of the space SP1 than in the case of the vibration generator 101X.

[0107] The magnetic flux vertically penetrating the space SP1 is a magnetic flux that passes through the lower surface of the space SP1 and the upper surface of the space SP1. The same is true for the magnetic flux vertically penetrating the space SP1X and the magnetic flux vertically penetrating the space SP2.

[0108] In addition, space SP1 is a rectangular space having the same width and depth as the right harness portion 4U1R, space SP1X is a rectangular space having the same width and depth as the right harness portion 4U1R, and space SP2 is a rectangular space having the same width and depth as the left harness portion 4U1L.

[0109] With this configuration, in the vibration generator 101, the magnetic flux perpendicularly passing through the right side portion of the right harness portion 4U1R is reduced compared to the vibration generator 101X, and the generation of a magnetic flux concentration portion is suppressed. This is because the magnetic flux extending from the first central magnet 5C1 extends in a manner that is more inclined relative to the Z axis as it moves away from the first central magnet 5C1.

[0110] In addition, the above description is about the structure for suppressing the formation of the magnetic flux concentration portion on the right side portion of the right harness portion 4U1R, but it is also applicable to the structure for suppressing the formation of the magnetic flux concentration portion on the left side portion of the left harness portion 4U2L, the right side portion of the right harness portion 4U2R, the left side portion of the left harness portion 4U3L, the right side portion of the right harness portion 4D1R, the left side portion of the left harness portion 4D2L, the right side portion of the right harness portion 4D2R and the left side portion of the left harness portion 4D3L.

[0111] Here, refer to Figures 13A to 13C Another configuration for suppressing the occurrence of the magnetic flux concentrated portion will be described. Figures 13A to 13C is a cross-sectional view of the housing 1, the coil 4, and the magnetic flux source 5, corresponding to Fig. 9A Specifically, Fig.13A It is a cross-sectional view of the housing 1 , the coil 4 , and the magnetic flux source 5 when the movable body MB (magnetic flux source 5 ) is located at the center of the movable range in a vibration generating device 101A as another configuration example of the vibration generating device 101 . Fig. 13B It is a cross-sectional view of the housing 1 , the coil 4 , and the magnetic flux source 5 when the movable body MB (magnetic flux source 5 ) is located at the center of the movable range in a vibration generating device 101B as another configuration example of the vibration generating device 101 . Fig. 13C It is a cross-sectional view of the housing 1 , the coil 4 , and the magnetic flux source 5 when the movable body MB (magnetic flux source 5 ) is located at the center of the movable range in a vibration generating device 101C as another configuration example of the vibration generating device 101 .

[0112] Fig.13A The vibration generating device 101A shown is different from the vibration generating device 101 mainly in that the upper coil 4U and the lower coil 4D are respectively composed of the left coil 4L and the right coil 4R, and the central magnet 5C is composed of a permanent magnet magnetized into two poles. That is, the vibration generating device 101 is different from the vibration generating device 101A mainly in that the upper coil 4U and the lower coil 4D have the central coil 4C in addition to the left coil 4L and the right coil 4R, and the central magnet 5C is composed of two permanent magnets magnetized into two poles (a first central magnet 5C1 and a second central magnet 5C2). In addition, the vibration generating device 101A is different from the vibration generating device 101 in that the height H21 of the central magnet 5C is the same as the height H22 of the left magnet 5L and the right magnet 5R, respectively, and the magnetic force of the central magnet 5C is weaker than the magnetic force of the left magnet 5L and the right magnet 5R, respectively. That is, as Fig.11AAs shown, the vibration generating device 101 is different from the vibration generating device 101A in that the height H1 of the central magnet 5C is smaller than the height H2 of the left magnet 5L and the right magnet 5R, and the magnetic force of the central magnet 5C is the same as the magnetic force of the left magnet 5L and the right magnet 5R. Fig.13A In the figure, for the sake of clarity, a cross pattern coarser than the cross patterns added to the left and right magnets 5L and 5R having stronger magnetic forces is added to the center magnet 5C having weaker magnetic force.

[0113] With this configuration, the vibration generating device 101A can suppress the intensity of the magnetic field passing through the wire harness portion of the coil 4 from becoming uneven, similar to the vibration generating device 101 using the thin central magnet 5C. In addition, in order to obtain the same effect, the vibration generating device 101A can also be configured so that the magnetic forces of the left magnet 5L, the central magnet 5C, and the right magnet 5R are the same, and the height H21 of the central magnet 5C is smaller than the height H22 of the left magnet 5L and the right magnet 5R.

[0114] Fig. 13B The vibration generating device 101B shown mainly differs from the vibration generating device 101A in that the central magnet 5C is composed of two permanent magnets (the first central magnet 5C1 and the second central magnet 5C2), and the width W31 of the left magnet 5L, the width W32 of the first central magnet 5C1, the width W33 of the second central magnet 5C2, and the width W34 of the right magnet 5R are substantially the same. In addition, the vibration generating device 101B differs from the vibration generating device 101A in that the magnetic forces of the left magnet 5L, the first central magnet 5C1, the second central magnet 5C2, and the right magnet 5R are substantially the same, and the height H31 of the first central magnet 5C1 and the second central magnet 5C2 is smaller than the height H32 of the left magnet 5L and the right magnet 5R. However, the vibration generating device 101B is common to the vibration generating device 101A in other points.

[0115] With this configuration, the vibration generator 101B can suppress the intensity of the magnetic field passing through the wire bundle of the coil 4 from becoming uneven, similar to the vibration generator 101A using the central magnet 5C having a relatively weak magnetic force.

[0116] Fig. 13C The vibration generating device 101C shown is different from the vibration generating device 101B mainly in that the height H41 of the first central magnet 5C1 and the second central magnet 5C2 is approximately the same as the height H42 of the left magnet 5L and the right magnet 5R, and the width W42 of the first central magnet 5C1 and the width W43 of the second central magnet 5C2 are smaller than the width W41 of the left magnet 5L and the width W44 of the right magnet 5R.

[0117] With this configuration, the vibration generator 101C can suppress the intensity of the magnetic field passing through the wire bundle of the coil 4 from becoming uneven, similar to the vibration generator 101B using the thin and wide central magnet 5C.

[0118] As described above, the vibration generating device 101 can suppress the intensity of the magnetic field passing through the harness portion of the coil 4 from becoming uneven by appropriately setting at least one of the width, height (the distance between the central magnet 5C and the coil 4), depth, and magnetic force of the central magnet 5C. As a result, the drive mechanism DM composed of the coil 4 and the magnetic flux source 5 can suppress the reduction of the drive force (electromagnetic force) when the movable body MB is displaced in the left-right direction. In the present embodiment, the drive mechanism DM can output a substantially fixed drive force (electromagnetic force) regardless of the displacement amount of the movable body MB in the left-right direction. On the other hand, in Fig. 11B In the vibration generator 101X shown, the driving force (electromagnetic force) of the driving mechanism DM tends to become smaller as the displacement amount of the movable body MB (magnetic flux source 5) increases.

[0119] Alternatively, plate-shaped members made of magnetic material may be attached to the upper and lower surfaces of the central magnet 5C. This is to reduce the strength of the magnetic field emitted from the central magnet 5C and passing through the coil 4. In this case, the heights of the left magnet 5L, the central magnet 5C, and the right magnet 5R may be the same.

[0120] This configuration is similar to the case of the vibration generators 101A to 101C, and can suppress the intensity of the magnetic field in the wire bundle portion passing through the coil 4 from becoming non-uniform.

[0121] Next, refer to Fig.14 Another configuration for suppressing the occurrence of a magnetic flux concentration portion will be described. Fig.14 is a top view of the housing 1, the coil 4, and the magnetic flux source 5, corresponding to Fig. 10A Specifically, Fig.14 It is a plan view of the housing 1 , the coil 4 , and the magnetic flux source 5 when the movable body MB (magnetic flux source 5 ) is located at the center of the movable range in a vibration generating device 101D as another configuration example of the vibration generating device 101 .

[0122] Fig.14 The vibration generator 101D shown is different from the vibration generator 101 in that the depth DP1 of the central magnet 5C is smaller than the depth DP2 of each of the left magnet 5L and the right magnet 5R, but is similar to the vibration generator 101 in other points.

[0123] exist Fig.14In the example shown, the occurrence of the magnetic flux concentration portion is suppressed by the configuration in which the depth DP1 of the central magnet 5C (the first central magnet 5C1 and the second central magnet 5C2) is smaller than the depth DP2 of each of the left magnet 5L and the right magnet 5R.

[0124] With this configuration, the vibration generator 101D can suppress the intensity of the magnetic field passing through the wire bundle of the coil 4 from becoming uneven, similar to the vibration generator 101 using the thin central magnet 5C.

[0125] As mentioned above, for example Figure 2 As shown, the vibration generating device 101 according to the embodiment of the present invention includes a housing HS as a fixed body having an upper housing 1U and a lower housing 1D (see Figure 1A ), a movable body MB accommodated in the space between the upper shell 1U and the lower shell 1D, a guide mechanism GM for guiding the movable body MB so that the movable body MB can reciprocate in the left-right direction in the housing HS, and a drive mechanism DM, which is fixed to one of the movable body MB and the housing HS (in Figure 2 In the example shown, the magnetic flux source 5 is a movable body MB) and the other one of the movable body MB and the housing HS is fixed (in Figure 2 In the example shown, the coil 4 of the housing HS is used to apply a driving force in the left-right direction to the movable body MB.

[0126] Moreover, for example Figure 5A As shown in FIG. 1 , the guide mechanism GM includes an upper guide portion 1UG formed integrally with the upper case 1U and extending downward from the upper case 1U, and a lower guide portion 1DG formed integrally with the lower case 1D and extending upward from the lower case 1D. The guide mechanism GM is configured such that a guided portion 6G formed on the movable body MB (magnetic flux source holding member 6) is slidably guided in the left-right direction by the upper guide portion 1UG and the lower guide portion 1DG.

[0127] Since the vibration generating device 101 uses a part of the upper housing 1U and a part of the lower housing 1D to form the guide mechanism GM, although it is provided with the guide mechanism GM that guides the movable body MB so that the movable body MB can reciprocate in the left-right direction in the housing HS, it is possible to suppress an increase in the number of components. In addition, this configuration can suppress an increase in the size of the vibration generating device 101.

[0128] like Figure 5B As shown, the guide mechanism GM may be configured so that the guided portion 6G is slidably guided in the left-right direction in the space between the upper guide portion 1UG and the lower guide portion 1DG.

[0129] Specifically, for example Figure 5A As shown, the upper guide portion 1UG may include an upper front guide portion 1UGF located on the front side of the upper housing 1U and an upper rear guide portion 1UGB located on the rear side of the upper housing 1U. In addition, the lower guide portion 1DG may include a lower front guide portion 1DGF located on the front side of the lower housing 1D and a lower rear guide portion 1DGB located on the rear side of the lower housing 1D. Furthermore, the guided portion 6G may include a front guided portion 6GF located on the front side of the magnetic flux source holding member 6 constituting the movable body MB and a rear guided portion 6GB located on the rear side of the magnetic flux source holding member 6 constituting the movable body MB.

[0130] More specifically, the magnetic flux source holding member 6 may also include a convex front guided portion 6GF formed to protrude forward from its front surface so as to fit into a substantially rectangular parallelepiped space, i.e., a concave space, formed between the front end portions of the upper front guide portion 1UGF and the front end portions of the lower front guide portion 1DGF. Furthermore, the magnetic flux source holding member 6 may also include a convex rear guided portion 6GB formed to protrude backward from its rear surface so as to fit into a substantially rectangular parallelepiped space, i.e., a concave space, formed between the front end portions of the upper rear guide portion 1UGB and the front end portions of the lower rear guide portion 1DGB.

[0131] In this configuration, the guide mechanism GM can suppress the movement of the guided portion 6G in directions other than the left-right direction (Y-axis direction). That is, the guide mechanism GM can suppress the movement of the movable body MB in the front-rear direction (X-axis direction) and the up-down direction (Z-axis direction). Therefore, this configuration can simplify the shape of the elastic support member 7 that is sandwiched between the box HS and the movable body MB and can elastically support the movable body MB. This is because the elastic support member 7 does not need to suppress the movement of the movable body MB in the front-rear direction (X-axis direction) and the up-down direction (Z-axis direction).

[0132] The housing HS may also include a cylindrical side shell 2 with an upper and lower portion open. Figure 5A as well as Fig. 6A As shown, the housing HS may be configured such that the upper case 1U is positioned by contacting the upper end of the side case 2 from above, and the lower case 1D is positioned by contacting the lower end of the side case 2 from below.

[0133] This configuration can achieve a desired size of the concave space formed between the front end of the upper rear guide 1UGB and the front end of the lower rear guide 1DGB with high accuracy. Therefore, this configuration can achieve smooth sliding of the movable body MB in the left-right direction.

[0134] The upper housing 1U and the lower housing 1D are preferably configured to have the same shape and the same size. This configuration can further reduce the number of components constituting the vibration generator 101 .

[0135] In addition, for example Figure 2 As shown, the vibration generating device 101 according to the embodiment of the present invention includes a housing HS as a fixed body (see Figure 1A Reference), a movable body MB accommodated in the housing HS, a guide mechanism GM for guiding the movable body MB so that the movable body MB can reciprocate in the left-right direction in the housing HS, and a side fixed to the movable body MB and the housing HS (in Figure 2 In the example shown, the movable body MB) is provided with a magnetic flux source 5 that generates a magnetic flux in the vertical direction, and a coil 4 that is fixed to the movable body MB and the other side of the housing HS (in the case of the movable body MB) in such a manner as to intersect the magnetic flux generated by the magnetic flux source 5. Figure 2 In the example shown, it is a box body HS), which extends in the front-to-back direction and is arranged in parallel in the left-to-right direction, and is composed of conductive wires.

[0136] For example Figure 3A As shown, the magnetic flux source 5 includes a left magnet 5L, at least one central magnet 5C and a right magnet 5R. The left magnet 5L, at least one central magnet 5C and the right magnet 5R are arranged side by side in the left-right direction.

[0137] like Fig. 9A As shown, the coil 4 is constructed to include a left coil 4L and a right coil 4R, wherein the left coil 4L is composed of a left wire harness portion that intersects the magnetic flux from the left magnet 5L and a right wire harness portion that intersects the magnetic flux from the central magnet 5C, and the right coil 4R is composed of a left wire harness portion that intersects the magnetic flux from the central magnet 5C and a right wire harness portion that intersects the magnetic flux from the right magnet 5R.

[0138] Moreover, the vibration generating device 101 is constructed so that the magnetic flux generated by the central magnet 5C and the space between the right side wire harness portion of the left side coil 4L and the central magnet 5C in the up-down direction is smaller than the magnetic flux generated by the left side magnet 5L and the space between the left side wire harness portion of the left side coil 4L and the left side magnet 5L in the up-down direction, and the magnetic flux generated by the central magnet 5C and the space between the left side wire harness portion of the right side coil 4R and the central magnet 5C in the up-down direction is smaller than the magnetic flux generated by the right side magnet 5R and the space between the right side wire harness portion of the right side coil 4R and the right side magnet 5R in the up-down direction.

[0139] Moreover, the vibration generating device 101 is preferably constructed so that the magnetic flux passing through each wiring harness portion constituting the coil 4 is approximately uniform between the wiring harness portions by appropriately setting at least one of the width, height (the distance between the central magnet 5C and the coil 4), depth and magnetic force of the central magnet 5C.

[0140] This structure can prevent the strength of the magnetic field passing through the coil 4 from becoming uneven depending on the position, regardless of the relative positional relationship between the coil 4 and the magnetic flux source 5. Specifically, this structure can prevent the magnetic flux passing through the harness portion of the coil 4 from becoming uneven between the harness portions. Therefore, this structure can prevent the strength of the magnetic field passing through a specific harness portion in the coil 4 from changing when the movable body MB moves in the left-right direction, thereby preventing the induced electromotive force generated due to electromagnetic induction and thus hindering the movement in the desired direction. This means that Fig. 11B Compared to a configuration in which the strength of the magnetic field passing through the coil 4 becomes uneven depending on the position as shown, the vibration generating device 101 can achieve a larger driving force with the same power consumption, or can suppress the power consumption used to achieve the same driving force.

[0141] For example Fig.11A As shown in FIG. 1 , the magnetic flux source 5 may be configured such that the thickness of the central magnet 5C in the vertical direction is smaller than the thickness of the left magnet 5L in the vertical direction, and smaller than the thickness of the right magnet 5R in the vertical direction. This is to reduce the magnetic flux generated by the central magnet 5C in the magnetic flux passing through the wire bundle of the coil 4, thereby suppressing the intensity of the magnetic field passing through the wire bundle of the coil 4 from becoming non-uniform depending on the position.

[0142] This composition is similar to Fig. 13C Compared with the case where the magnetic flux source 5 is configured such that the width of the central magnet 5C in the left-right direction is smaller than the widths of the left magnet 5L and the right magnet 5R in the left-right direction, it is possible to more reliably suppress the intensity of the magnetic field passing through the coil 4 from becoming uneven depending on the position. This is because this configuration can make the widths of the left magnet 5L, the central magnet 5C, and the right magnet 5R in the left-right direction fit the width of the wire harness portion of the coil 4 in the left-right direction.

[0143] In addition, the magnetic flux source 5 can also be configured as follows Fig.13A As shown, the central magnet 5C has a width dimension in the left-right direction that is approximately twice that of the left magnet 5L, and generates magnetic flux toward the right wire portion of the left coil 4L and the left wire portion of the coil adjacent to the right side of the left coil 4L (the right coil 4R).

[0144] This composition is similar to Fig. 13BAs shown, the number of components constituting the vibration generator 101 can be reduced compared to the case where the center magnet 5C is constituted by arranging two magnets having the same left-right width as the left coil 4L in parallel.

[0145] 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 various features described with reference to the above embodiments can also be appropriately combined as long as there is no technical contradiction.

[0146] For example, in the above-mentioned embodiment, the lower housing 1D, the upper housing 1U, and the side housing 2 are formed as separate components independent of each other. However, the side housing 2 may be integrated with the lower housing 1D or the upper housing 1U. For example, the upper housing 1U and the side housing 2 may be formed as one component.

[0147] In addition, the upper guide portion 1UG and the lower guide portion 1DG may be formed opposite to the second side plate portion 2A2 and the fourth side plate portion 2A4, respectively. In this case, the guided portion 6G may be formed at the left end and the right end of the movable body MB. For example, the guided portion 6G may be a combination of a rod-shaped member protruding to the left from the left end of the magnetic flux source holding member 6 and a rod-shaped member protruding to the right from the right end of the magnetic flux source holding member 6. In this case, the guide mechanism GM may be configured such that the upper guide portion 1UG has an upper right guide portion and an upper left guide portion, and the lower guide portion 1DG has a lower right guide portion and a lower left guide portion. Furthermore, the rod-shaped member protruding to the left from the left end of the magnetic flux source holding member 6 may be configured to be slidably supported between the front end of the upper left guide portion and the front end of the lower left guide portion, and the rod-shaped member protruding to the right from the right end of the magnetic flux source holding member 6 may be configured to be slidably supported between the front end of the upper right guide portion and the front end of the lower right guide portion. Alternatively, the rod-shaped member protruding to the left from the left end portion of the magnetic flux source holding member 6 may be configured to be inserted into a guide hole formed in at least one of the upper left guide portion and the lower left guide portion, and the rod-shaped member protruding to the right from the right end portion of the magnetic flux source holding member 6 may be configured to be inserted into a guide hole formed in at least one of the upper right guide portion and the lower right guide portion.

[0148] Furthermore, in the above-mentioned embodiment, the magnetic flux source holding member 6 has a convex front guided portion 6GF formed protruding forward from its front surface so as to be embedded in a substantially rectangular parallelepiped space, i.e., a concave space, formed between the front end portion of the upper front guide portion 1UGF and the front end portion of the lower front guide portion 1DGF. Furthermore, the magnetic flux source holding member 6 has a convex rear guided portion 6GB formed protruding backward from its rear surface so as to be embedded in a substantially rectangular parallelepiped space, i.e., a concave space, formed between the front end portion of the upper rear guide portion 1UGB and the front end portion of the lower rear guide portion 1DGB. However, the magnetic flux source holding member 6 may also have a concave guided portion instead of the convex guided portion 6G. For example, the magnetic flux source holding member 6 may also have a concave front guided portion instead of the convex front guided portion 6GF. In this case, the front end portions of the upper front guide portion 1UGF and the lower front guide portion 1DGF may also be formed so as to be bent inward and engage with the concave front guided portion. The same applies to the rear guided portion 6GB.

[0149] In addition, in the above-mentioned embodiment, the vibration generating device 101 is configured such that the coil 4 is mounted on the housing HS as a fixed body, and the magnetic flux source 5 is mounted on the movable body MB. That is, the vibration generating device 101 is configured as a moving magnet type (moving magnet) vibration generating device. However, the vibration generating device 101 may also be configured such that the coil 4 is mounted on the movable body MB, and the magnetic flux source 5 is mounted on the housing HS. That is, the vibration generating device 101 may also be configured as a moving coil type (moving coil) vibration generating device.

[0150] In the above embodiment, the vibration generator 101 is configured such that the coil axis of the coil 4 is perpendicular to the moving direction of the magnetic flux source 5. However, the vibration generator 101 may be configured such that the coil axis of the coil 4 is parallel to the moving direction of the magnetic flux source 5.

[0151] In the above-described embodiment, the coil 4 is configured to include the upper coil 4U fixed to the lower surface of the upper housing 1U and the lower coil 4D fixed to the upper surface of the lower housing 1D. However, either the upper coil 4U or the lower coil 4D may be omitted.

[0152] This application claims priority based on Japanese Patent Application No. 2020-217437 filed on December 25, 2020, the entire contents of which are incorporated into this application by reference.

[0153] Description of Reference Numerals

[0154] 1…housing, 1D…lower housing, 1DG…lower guide, 1DGB…lower rear guide, 1DGF…lower front guide, 1DP…lower protrusion, 1DPC…central lower protrusion, 1DPL…lower left protrusion, 1DPR…lower right protrusion, 1U…upper housing, 1UG…upper guide, 1UGB…upper rear guide, 1UGF…upper front guide, 2…side housing, 2A…side plate, 2A1…first side plate, 2A2…second side plate, 2A3…third side plate, 2A4…fourth side plate, 2H…through hole, 2HL…left through hole, 2HR…right through hole, 2P…protrusion, 2PL…left protrusion, 2PR…right protrusion, 2T…internal thread hole , 2T1…first internal thread hole, 2T2…second internal thread hole, 2T3…third internal thread hole, 2T4…fourth internal thread hole, 3…fastening component, 3D…lower fastening component, 3D1…first lower external thread, 3D2…second lower external thread, 3D3…third lower external thread, 3D4…fourth lower external thread, 3U…upper fastening component, 3U1…first upper external thread, 3U2…second upper external thread, 3U3…third upper external thread, 3U4…fourth upper external thread, 4…coil, 4C…central coil, 4D…lower coil, 4D1…first lower coil, 4D1L…left harness, 4D1R…right harness, 4D2…second lower coil, 4D2L…left harness, 4D2R…right side harness portion, 4D3…third lower coil, 4D3L…left harness portion, 4D3R…right harness portion, 4L…left coil, 4R…right coil, 4U…upper coil, 4U1…first upper coil, 4U2…second upper coil, 4U3…third upper coil, 5…magnetic flux source, 5C…central magnet, 5C1…first central magnet, 5C2…second central magnet, 5L…left magnet, 5R…right magnet, 6…magnetic flux source holding member, 6G…guided portion, 6GB…rear guided portion, 6GF…front guided portion, 6T…internal thread hole, 6TL…left internal thread hole, 6TR…right internal thread hole, 7…elastic support member, 7L…left leaf spring, 7R…right leaf spring, 7H…through hole, 7 HL…left through hole, 7HR…right through hole, 7T…internal thread hole, 7TL…left internal thread hole, 7TR…right internal thread hole, 8…fastening member, 8L…left external thread, 8R…right external thread, 101, 101A to 101D, 101X…vibration generator, BM…insulating substrate, BS1…upper surface, BS2…front end surface, BS3…lower surface, BS4…front end surface, BS5…upper rear surface, BS6…inner surface, BS7…lower rear surface, BS8…inner surface, BS9…rear surface, BS10…inner surface, BS11…outer surface, BS12…outer surface, CTR…control unit, DM…driving mechanism, FS1…upper surface, FS2…front end surface, FS3…lower surface,FS4…front end surface, FS5…upper front surface, FS6…inner surface, FS7…lower front surface, FS8…inner surface, FS9…front surface, FS10…inner surface, FS11…outer surface, FS12…outer surface, GM…guide mechanism, HS…housing, IT…input terminal, MB…movable body, VA…vibration axis, VE…vibration device. ,

Claims

1. A vibration generating device, characterized in that: have: Fixed body; A movable body is accommodated in the fixed body; a guide mechanism for guiding the movable body in such a manner that the movable body can reciprocate in the left-right direction within the fixed body; A magnetic flux source fixed to one of the movable body and the fixed body and generating a magnetic flux in an up-down direction; as well as The coil is fixed to the other of the movable body and the fixed body in a manner intersecting the magnetic flux generated by the magnetic flux source, extends in the front-rear direction and is arranged in parallel in the left-right direction, and is composed of a conductive wire. The magnetic flux source comprises a left magnet, at least one central magnet and a right magnet, The left magnet, at least one of the central magnets, and the right magnet are arranged in parallel along the left-right direction. The coil comprises: a left coil, comprising a left wire harness portion intersecting with the magnetic flux from the left magnet, and a right wire harness portion intersecting with the magnetic flux from the central magnet; and The right coil is composed of a left wire bundle portion intersecting with the magnetic flux from the central magnet and a right wire bundle portion intersecting with the magnetic flux from the right magnet. The magnetic flux generated by the central magnet and penetrating the space between the right wire harness portion of the left coil and the central magnet in the vertical direction is smaller than the magnetic flux generated by the left magnet and penetrating the space between the left wire harness portion of the left coil and the left magnet in the vertical direction. The magnetic flux generated by the central magnet and vertically penetrating the space between the left harness portion of the right coil and the central magnet is smaller than the magnetic flux generated by the right magnet and vertically penetrating the space between the right harness portion of the right coil and the right magnet.

2. The vibration generating device according to claim 1, characterized in that: The thickness of the central magnet in the up-down direction is smaller than the thickness of the left magnet in the up-down direction, and smaller than the thickness of the right magnet in the up-down direction.

3. The vibration generating device according to claim 1 or 2, characterized in that: The central magnet has a width dimension in the left-right direction that is approximately twice that of the left magnet, and generates magnetic flux toward the right harness portion of the left coil and the left harness portion of the coil adjacent to the right side of the left coil.

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