Vibration generating device

Abstract

To provide a vibration generator which can inhibit reduction of driving force.SOLUTION: A vibration generator 101 includes: a housing HS; a movable body MB; guide means GM which guides the movable body MB along a lateral direction in a reciprocable manner within the housing HS; a left side magnet 5L which is fixed to the movable body MB so that an N pole portion and an S pole portion are aligned in a vertical direction and generates magnetic flux along the vertical direction; a coil 4 which is fixed to the housing HS so as to intersect with the magnetic flux generated by the left side magnet 5L; and a left fixed side magnet 7L which is fixed to the housing HS so that an N pole portion and an S pole portion are aligned in the vertical direction and generates magnetic flux along the vertical direction. The N pole portion of the left side magnet 5L is arranged so as to face the N pole portion of the left fixed side magnet 7L in the lateral direction and the S pole portion of the left side magnet 5L is arranged so as to face the S pole portion of the left fixed side magnet 7L in the lateral direction.SELECTED DRAWING: Figure 2

Description

Technical Field

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

Background Art

[0002] Conventionally, a vibration generating device is known that supports a movable body so as to be vibratable by using a spring member disposed between the movable body and a fixed body (housing). In such a vibration generating device, when the movable body is moved from the initial position by the electromagnetic force generated by the drive magnet and the drive coil, the spring member is compressed and generates a restoring force to return the movable body to the initial position.

[0003] However, such a vibration generating device has a problem that the spring member has a life due to metal fatigue.

[0004] In order to solve such a problem, a linear vibration actuator configured to be able to return a movable body to an initial position without using a spring member is known (see Patent Document 1). This linear vibration actuator includes a magnetic spring that utilizes a repulsive force (repulsive force) between a movable-side magnet attached to the movable body and a fixed-side magnet attached to the housing, separately from the drive magnet attached to the movable body. The magnetic spring is configured to be able to generate a restoring force to return the movable body to the initial position when the movable body is moved from the initial position by the electromagnetic force, similar to the spring member.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] However, in the above linear vibration actuator, while the drive magnet is magnetized in two poles along a direction perpendicular to the vibration direction, both the movable-side magnet and the fixed-side magnet are magnetized in two poles along the vibration direction. Therefore, the movable-side magnet may reduce the number of magnetic fluxes passing through the drive coil among the magnetic fluxes generated by the drive magnet, and there is a risk of reducing the driving force, which is the electromagnetic force generated by the drive magnet and the drive coil.

[0007] Therefore, it is desirable to provide a vibration generating device capable of suppressing such a decrease in the driving force.

Means for Solving the Problems

[0008] The vibration generator according to an embodiment of the present invention includes a fixed body, a movable body housed in the fixed body, guide means for guiding the movable body to reciprocate along the left-right direction within the fixed body, a movable-side magnetic flux generating member fixed to the movable body such that an N-pole portion and an S-pole portion are arranged in the up-down direction and generating a magnetic flux along the up-down direction, a coil formed of conductive wires extending along the front-rear direction and arranged side by side along the left-right direction and fixed to the fixed body so as to intersect the magnetic flux generated by the movable-side magnetic flux generating member, and a fixed-side magnetic flux generating member fixed to the fixed body such that an N-pole portion and an S-pole portion are arranged in the up-down direction and generating a magnetic flux along the up-down direction. The N-pole portion of the movable-side magnetic flux generating member is arranged to face the N-pole portion of the fixed-side magnetic flux generating member in the left-right direction, and the S-pole portion of the movable-side magnetic flux generating member is arranged to face the S-pole portion of the fixed-side magnetic flux generating member in the left-right direction. The coils are arranged in a plurality side by side in the left-right direction. The movable-side magnetic flux generating member includes a plurality of movable-side magnets arranged side by side in the left-right direction. The plurality of movable-side magnets include a left movable-side magnet, a central movable-side magnet, and a right movable-side magnet. The fixed-side magnetic flux generating member includes a left fixed-side magnet arranged to face the left movable-side magnet arranged at the left end of the plurality of movable-side magnets in the left-right direction, and a right fixed-side magnet arranged to face the right movable-side magnet arranged at the right end of the plurality of movable-side magnets in the left-right direction. The N-pole portion of the left movable-side magnet is arranged to face the N-pole portion of the left fixed-side magnet in the left-right direction, and the S-pole portion of the left movable-side magnet is arranged to face the S-pole portion of the left fixed-side magnet in the left-right direction. The N-pole portion of the right movable-side magnet is arranged to face the N-pole portion of the right fixed-side magnet in the left-right direction, and the S-pole portion of the right movable-side magnet is arranged to face the S-pole portion of the right fixed-side magnet in the left-right direction. Each of all the plurality of movable-side magnets is a permanent magnet magnetized with two poles in the up-down direction. In the left - right direction, the width of the left movable - side magnet and the width of the right movable - side magnet are approximately half of the width of the central movable - side magnet. .

Advantages of the Invention

[0009] The above-described vibration generator can suppress a decrease in driving force.

Brief Description of the Drawings

[0010]

Figure 1A

Figure 1B

Figure 2

Figure 3A

Figure 3B

Figure 4

Figure 5A

Figure 5B

Figure 6A

Figure 6B

Figure 7A

Figure 7B

Figure 8A

Figure 8B

Figure 9A

Figure 9B

Figure 9C

Figure 10A

Figure 10B

Figure 10C

Figure 11

Embodiments for Carrying Out the Invention

[0011] Hereinafter, with reference to the drawings, the vibration generator 101 according to an embodiment of the present invention will be described. FIGS. 1A and 1B are external views of the vibration generator 101. Specifically, FIG. 1A is a perspective view of the vibration generator 101, and FIG. 1B is a top view of the vibration generator 101. FIG. 2 is an exploded perspective view of the vibration generator 101.

[0012] In each of FIGS. 1A, 1B, and 2, X1 represents one direction of the X-axis constituting a three-dimensional orthogonal coordinate system, and X2 represents the other direction of the X-axis. Also, Y1 represents one direction of the Y-axis constituting a three-dimensional orthogonal coordinate system, and Y2 represents the other direction. Similarly, 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 the present embodiment, the X1 side of the vibration generator 101 corresponds to the front side (front face side) of the vibration generator 101, and the X2 side of the vibration generator 101 corresponds to the rear side (rear face side) of the vibration generator 101. Also, the Y1 side of the vibration generator 101 corresponds to the left side of the vibration generator 101, and the Y2 side of the vibration generator 101 corresponds to the right side of the vibration generator 101. And the Z1 side of the vibration generator 101 corresponds to the upper side of the vibration generator 101, and the Z2 side of the vibration generator 101 corresponds to the lower side of the vibration generator 101. The same applies to other figures.

[0013] The vibration device VE includes a control unit CTR and a vibration generating device 101. The vibration generating device 101 includes a housing HS as a fixed body, a movable body MB accommodated in the housing HS, and a coil 4 attached to the housing HS. The control unit CTR is connected to an input terminal (not shown) provided on an insulating substrate (not shown) fixed to the housing HS. The broken line shown in FIG. 1A schematically shows that the control unit CTR and the input terminal provided on the insulating substrate are electrically connected.

[0014] As shown in FIG. 1A, the housing HS has a substantially rectangular parallelepiped outer shape and is configured such that the areas of the surfaces (upper surface and lower surface) parallel to the XY plane are the largest. In the present embodiment, the housing HS is composed of a case 1 and a side case 2.

[0015] The case 1 includes an upper case 1U forming the top surface of the housing HS and a lower case 1D forming the bottom surface of the housing HS. Both the upper case 1U and the lower case 1D are flat plate-like members. In the present embodiment, the upper case 1U and the lower case 1D have the same shape and the same size. That is, the upper case 1U and the lower case 1D are configured as the same component.

[0016] Also, the upper case 1U is formed to be symmetric in the front-rear direction and symmetric in the left-right direction. The same applies to the lower case 1D. The upper case 1U and the lower case 1D are arranged to be vertically symmetric with respect to each other.

[0017] Specifically, the upper case 1U includes an upper magnetic member 1UM and an upper frame body 1UW. Similarly, the lower case 1D includes a lower magnetic member 1DM and a lower frame body 1DW. Hereinafter, the upper magnetic member 1UM and the lower magnetic member 1DM are also referred to as a magnetic member MG, and the upper frame body 1UW and the lower frame body 1DW are also referred to as a frame body FB.

[0018] The magnetic member MG is a member that is arranged to magnetically attract to the magnetic flux source 5 at a location away from the magnetic flux source 5. In the present embodiment, the magnetic member MG is fixed to the frame body FB so as not to contact the magnetic flux source 5 that constitutes the movable body MB and to magnetically hold the magnetic flux source 5 at a predetermined position. When the magnetic flux source 5 is displaced from the predetermined position, the magnetic member MG acts to pull back the magnetic flux source 5 to the predetermined position by the attractive force between the magnetic flux source 5 and the magnetic member MG based on the magnetic force generated by the magnetic flux source 5. The predetermined position is, for example, the position of the magnetic flux source 5 when the movable body MB is located at the center of the movable range. In the present embodiment, the movable body MB is configured to be located at the center of the movable range when no power is supplied to the vibration generator 101.

[0019] The frame body FB is a non-magnetic member for supporting the magnetic member MG. In the present embodiment, the frame body FB is formed of austenitic stainless steel. However, the frame body FB may be formed of a synthetic resin. The magnetic member MG is joined to the frame body FB by an adhesive.

[0020] The side case 2 is formed so as to constitute the side surface of the housing HS. In the present embodiment, the side case 2 is a non-magnetic member and is formed of austenitic stainless steel. However, the side case 2 may be formed of a synthetic resin. Specifically, the side case 2 includes four side plate portions 2A formed in a flat plate shape. More specifically, as shown in FIG. 2, the side plate portion 2A has a first side plate portion 2A1 and a third side plate portion 2A3 that face each other, and a second side plate portion 2A2 and a fourth side plate portion 2A4 that are perpendicular to and face each of the first side plate portion 2A1 and the third side plate portion 2A3.

[0021] In Case 1, it is fastened to the side case 2 by the fastening member 3. Specifically, the fastening member 3 includes an upper fastening member 3U and a lower fastening member 3D. In this embodiment, the fastening member 3 is a male screw configured to be operable with a plus driver, and is configured to engage with female screw holes 2T formed at the four corners of the side case 2. The female screw holes 2T formed at the four corners of the side case 2 are formed to penetrate the corner portions of the side case 2 along the Z-axis direction, and include a first female screw hole 2T1 to a fourth female screw hole 2T4. And the upper case 1U (upper frame body 1UW) is fastened to the side case 2 by four upper fastening members 3U (a first upper male screw 3U1 to a fourth upper male screw 3U4). Specifically, the first upper male screw 3U1 is screwed into the upper opening of the first female screw hole 2T1 formed at the right front corner of the side case 2, the second upper male screw 3U2 is screwed into the upper opening of the second female screw hole 2T2 formed at the left front corner of the side case 2, the third upper male screw 3U3 is screwed into the upper opening of the third female screw hole 2T3 formed at the left rear corner of the side case 2, and the fourth upper male screw 3U4 is screwed into the upper opening of the fourth female screw hole 2T4 formed at the right rear corner of the side case 2. Similarly, the lower case 1D (lower frame body 1DW) is fastened to the side case 2 by four lower fastening members 3D (a first lower male screw 3D1 to a fourth lower male screw 3D4). Specifically, the first lower male screw 3D1 is screwed into the lower opening of the first female screw hole 2T1 formed at the right front corner of the side case 2, the second lower male screw 3D2 is screwed into the lower opening of the second female screw hole 2T2 formed at the left front corner of the side case 2, the third lower male screw 3D3 is screwed into the lower opening of the third female screw hole 2T3 formed at the left rear corner of the side case 2, and the fourth lower male screw 3D4 is screwed into the lower opening of the fourth female screw hole 2T4 formed at the right rear corner of the side case 2.

[0022] The coil 4 is a member that constitutes the driving means DM. In the present embodiment, the coil 4 is a winding coil formed by winding a conductive wire whose surface is coated with an insulating material, and is fixed to the case 1. FIG. 2 omits the illustration of the detailed winding state of the conductive wire for clarity. The same applies to other figures illustrating the coil 4. The coil 4 may be a multilayer coil, a thin film coil, or the like. Specifically, the coil 4 includes an upper coil 4U fixed to the lower surface (Z2 side) of the upper case 1U (upper magnetic member 1UM) and a lower coil 4D fixed to the upper surface (Z1 side) of the lower case 1D (lower magnetic member 1DM). The upper coil 4U includes a first upper coil 4U1, a second upper coil 4U2, and a third upper coil 4U3 that are juxtaposed 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 that are juxtaposed and connected in series along the Y-axis direction. 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.

[0023] 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, a non-volatile memory 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 may be configured to control the direction and magnitude of the current flowing through the coil 4 in response to a control command from an external device such as a computer, or may be configured to control the direction and magnitude of the current flowing through the coil 4 without receiving a control command from an external device. In the present embodiment, the control unit CTR is installed outside the housing HS, but may also be installed inside the housing HS.

[0024] 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 while being attached inside the housing HS.

[0025] Next, referring to FIGS. 3A, 3B, and 4, the details of the movable body MB will be described. FIGS. 3A, 3B, and 4 are external views of the movable body MB. Specifically, FIG. 3A is an overall perspective view of the movable body MB, and FIG. 3B is an exploded perspective view of the movable body MB. FIG. 4 is a top view of the movable body MB attached to the side case 2.

[0026] The movable body MB is configured to include a magnetic flux source 5 and a magnetic flux source holding member 6. Specifically, the movable body MB is configured to be able to reciprocate (vibrate) with respect to the housing HS (side case 2) along a vibration axis VA (see FIG. 3A) extending in a predetermined direction.

[0027] The magnetic flux source 5 is a member that constitutes the driving means DM and is configured to be able to generate a magnetic flux. In the present embodiment, the magnetic flux source 5 is a permanent magnet and includes 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 in two poles along the Z-axis direction and are juxtaposed along the Y-axis direction. In FIGS. 2, 3A, 3B, and 4, for clarity, the permanent magnet as the magnetic flux source 5 is provided with a thick cross pattern on the N-pole portion and a fine cross pattern on the S-pole portion.

[0028] The magnetic flux source holding member 6 is configured to be able 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 be able 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 along the Y-axis direction.

[0029] The driving means DM is configured to be able to vibrate the movable body MB along the vibration axis VA. In the present embodiment, the driving means DM is composed of a coil 4 and a magnetic flux source 5, and utilizes the electromagnetic force acting between the coil 4 and the magnetic flux source 5 according to the direction and magnitude of the current supplied to the coil 4 through the control unit CTR, and is configured to be able to vibrate the movable body MB (magnetic flux source 5) along the vibration axis VA.

[0030] The fixed-side magnetic flux source 7 is a member constituting the magnetic spring MS, and is configured to be able to generate a magnetic flux while being fixed to the side case 2. In the present embodiment, the fixed-side magnetic flux source 7 is a permanent magnet fixed to the side case 2, and includes a left fixed-side magnet 7L and a right fixed-side magnet 7R. Both the left fixed-side magnet 7L and the right fixed-side magnet 7R are permanent magnets magnetized in two poles along the Z-axis direction. The left fixed-side magnet 7L is fixed to the inner surface of the second side plate portion 2A2 of the side case 2 with an adhesive, and the right fixed-side magnet 7R is fixed to the inner surface of the fourth side plate portion 2A4 of the side case 2 with an adhesive. In addition, in FIG. 4, for clarity, the permanent magnet as the fixed-side magnetic flux source 7 is provided with a thick cross pattern on the N-pole portion and a fine cross pattern on the S-pole portion.

[0031] Specifically, the N-pole portion of the left magnet 5L is arranged to face the N-pole portion of the left fixed-side magnet 7L in the left-right direction (Y-axis direction), and the S-pole portion of the left magnet 5L is arranged to face the S-pole portion of the left fixed-side magnet 7L in the left-right direction (Y-axis direction). Also, the N-pole portion of the right magnet 5R is arranged to face the N-pole portion of the right fixed-side magnet 7R in the left-right direction (Y-axis direction), and the S-pole portion of the right magnet 5R is arranged to face the S-pole portion of the right fixed-side magnet 7R in the left-right direction (Y-axis direction).

[0032] The magnetic spring MS is configured to generate a restoring force that attempts to return the movable body MB to the initial position when the movable body MB is moved from the initial position (the center of the movable range) by the driving means DM. In the present embodiment, the magnetic spring MS is composed of a part of the magnetic flux source 5 and the fixed-side magnetic flux source 7, and is configured to be able to return the movable body MB to the initial position.

[0033] Specifically, the magnetic spring MS includes a left magnetic spring MSL and a right magnetic spring MSR. The left magnetic spring MSL is composed of a left magnet 5L and a left fixed-side magnet 7L, and is configured to be able to return the movable body MB that has moved leftward from the initial position to the initial position by the repulsive force between the left magnet 5L and the left fixed-side magnet 7L. Similarly, the right magnetic spring MSR is composed of a right magnet 5R and a right fixed-side magnet 7R, and is configured to be able to return the movable body MB that has moved rightward from the initial position to the initial position by the repulsive force between the right magnet 5R and the right fixed-side magnet 7R.

[0034] Next, referring to FIGS. 5A, 5B, 6A, 6B, 7A, and 7B, the guide means GM will be described. FIGS. 5A and 5B are detailed views of the members constituting the guide means GM. Specifically, FIG. 5A 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 a disassembled state. FIG. 5B is a left side view of the upper case 1U, the lower case 1D, and the magnetic flux source holding member 6 in an assembled state. In FIGS. 5A and 5B, for clarity, the case 1 and the side case 2 are provided with a fine dot pattern, and the magnetic flux source holding member 6 is provided with a coarse dot pattern. Further, in FIG. 5B, for clarity, the illustration of the side case 2 shown in FIG. 5A is omitted. FIGS. 6A and 6B are cross-sectional views of the members constituting the vibration generating device 101. Specifically, FIG. 6A is a view of the cross-section of the vibration generating device 101 in a plane parallel to the XZ plane including the cutting line (dashed line VIA-VIA) shown in FIG. 1B as viewed from the Y1 side. FIG. 6B is a view in which the illustration of the coil 4 and the magnetic flux source 5 in FIG. 6A is omitted. FIGS. 7A and 7B are perspective views of the members constituting the guide means GM. Specifically, FIG. 7A 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. FIG. 7B is a perspective view of the lower case 1D and the magnetic flux source holding member 6 in an assembled state. In FIGS. 7A and 7B, for clarity, the magnetic flux source holding member 6 is provided with a coarse dot pattern. Further, in FIGS. 7A and 7B, the fixed-side magnetic flux source 7 is illustrated to show the positional relationship between the magnetic flux source holding member 6 and the fixed-side magnetic flux source 7. Further, in FIG. 7B, a state in which the illustration of the upper case 1U in FIG. 7A is omitted is shown, and a state in which the magnetic flux source 5 is held by the magnetic flux source holding member 6 is shown so as to be visible.

[0035] The guide means GM is configured to be able to guide the movable body MB to reciprocate along the left - right direction (Y - axis direction) within the housing HS as a fixed body. In the present embodiment, the guide means GM includes an upper guide portion 1UG that is integrally formed with the upper case 1U and extends downward (Z2 direction) from the upper case 1U, and a lower guide portion 1DG that is integrally formed with the lower case 1D and extends upward (Z1 direction) from the lower case 1D. And the guide means GM is configured such that a guided portion 6G, which is a protruding portion formed on the magnetic - flux source holding member 6 constituting the movable body MB, is slidably guided along the left - right direction by the upper guide portion 1UG and the lower guide portion 1DG.

[0036] Specifically, the upper guide portion 1UG includes a front - upper guide portion 1UGF that extends in the Y - axis direction facing the first side - plate portion 2A1 of the side case 2 (see FIG. 2), and a rear - upper guide portion 1UGB that extends in the Y - axis direction facing the third side - plate portion 2A3 of the side case 2 (see FIG. 2). Similarly, the lower guide portion 1DG includes a front - lower guide portion 1DGF that extends in the Y - axis direction facing the first side - plate portion 2A1 of the side case 2 (see FIG. 2), and a rear - lower guide portion 1DGB that extends in the Y - axis direction facing the third side - plate portion 2A3 of the side case 2 (see FIG. 2).

[0037] The guided portion 6G formed on the magnetic - flux source holding member 6 includes a front - side guided portion 6GF that extends in the Y - axis direction facing the first side - plate portion 2A1 of the side case 2 (see FIG. 2), and a rear - side guided portion 6GB that extends in the Y - axis direction facing the third side - plate portion 2A3 of the side case 2 (see FIG. 2).

[0038] And, as shown in FIG. 5B, the tip of the front - upper guide portion 1UGF and the tip of the front - lower guide portion 1DGF are combined to face each other with the front - side guided portion 6GF therebetween, and the tip of the rear - upper guide portion 1UGB and the tip of the rear - lower guide portion 1DGB are combined to face each other with the rear - side guided portion 6GB therebetween.

[0039] In this embodiment, the tips of the upper front guide portion 1UGF and the lower front guide portion 1DGF are both combined so as to contact the front guided portion 6GF. That is, the front guided portion 6GF is configured to have substantially the same shape as the space formed between the tip of the upper front guide portion 1UGF and the tip of the lower front guide portion 1DGF. Specifically, the front guided portion 6GF is formed as a single substantially rectangular parallelepiped-shaped protrusion that continuously extends over most of the entire longitudinal length of the magnetic flux source holding member 6. However, the front guided portion 6GF may be a combination of a plurality of protrusions intermittently arranged along the longitudinal direction of the magnetic flux source holding member 6. The same applies to the rear guided portion 6GB. Further, in this embodiment, the magnetic flux source holding member 6 is formed to be front-rear symmetric. 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 have different shapes.

[0040] In the example shown in FIG. 5, when the magnetic flux source holding member 6 is combined with the case 1 and the side case 2, the upper surface FS1 of the front guided portion 6GF contacts the tip surface FS2 of the upper front guide portion 1UGF, and the lower surface FS3 of the front guided portion 6GF contacts the tip surface FS4 of the lower front guide portion 1DGF. Further, the magnetic flux source holding member 6 is configured such that the upper front surface FS5 (the portion of the front surface located above the front guided portion 6GF) contacts the inner surface FS6 of the upper front guide portion 1UGF, and the lower front surface FS7 (the portion of the front surface located below the front guided portion 6GF) contacts the inner surface FS8 of the lower front guide portion 1DGF. On the other hand, the magnetic flux source holding member 6 is configured such that the front surface FS9 of the front guided portion 6GF does not contact the inner surface FS10 (see FIG. 6A) of the first side plate portion 2A1 of the side case 2. Note that the case 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 case 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 case 2.

[0041] Similarly, when the magnetic flux source holding member 6 is combined with the case 1 and the side case 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. Further, the magnetic flux source holding member 6 is configured such 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 member 6 is configured such that the rear surface BS9 of the rear guided portion 6GB does not contact the inner surface BS10 (see FIG. 6A) of the third side plate portion 2A3 of the side case 2. Note that the case 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 case 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 case 2.

[0042] As described above, the guided portion 6G is configured to be slidable in the direction indicated by the bidirectional arrow AR1 in each of FIGS. 7A and 7B between the upper guide portion 1UG and the lower guide portion 1DG. Specifically, the guided portion 6G is configured to be reciprocally movable in the left-right direction (Y-axis direction) while bringing its upper surface into contact with the front end surface of the upper guide portion 1UG and its lower surface into contact with the front end surface of the lower guide portion 1DG.

[0043] With this configuration, the magnetic flux source holding member 6 is restricted in movement in each of the front-rear direction and the up-down direction, while smooth movement in the left-right direction is allowed.

[0044] Next, referring to FIGS. 8A, 8B, 9A to 9C, and 10A to 10C, the details of the driving means DM and the magnetic spring MS will be described. FIGS. 8A and 8B are detailed views of the coil 4 fixed to the housing HS as a fixed body. Specifically, FIG. 8A is a perspective view of the lower coil 4D fixed to the lower case 1D. FIG. 8B is a top view of the lower coil 4D fixed to the lower case 1D. In FIGS. 8A and 8B, for clarity, the lower coil 4D is provided with a dot pattern. FIG. 9A is a view of a cross-section of the vibration generating device 101 in a virtual plane parallel to the YZ plane including the cutting line (dashed line IXA-IXA) shown in FIG. 1B as viewed from the X1 side. FIGS. 9B and 9C are views of a cross-section of the case 1, the coil 4, and the magnetic flux source 5 in a virtual plane parallel to the YZ plane including the cutting line (dashed line IXB-IXB) shown in FIG. 7A as viewed from the X1 side. Specifically, FIG. 9A is a cross-sectional view of the vibration generating device 101 when the movable body MB (magnetic flux source 5) is located at the center of the movable range. FIG. 9B is a cross-sectional view of the case 1, the coil 4, the magnetic flux source 5, and the fixed-side magnetic flux source 7 when the movable body MB (magnetic flux source 5) is located at the right end of the movable range. FIG. 9C is a cross-sectional view of the case 1, the coil 4, the magnetic flux source 5, and the fixed-side magnetic flux source 7 when the movable body MB (magnetic flux source 5) is located at the left end of the movable range. In FIGS. 9A to 9C, for clarity, each permanent magnet constituting the magnetic flux source 5 and the fixed-side magnetic flux source 7 is provided with a thick cross pattern at the N-pole portion and a fine cross pattern at the S-pole portion instead of a pattern representing the cross-section. FIGS. 10A to 10C are top views of the magnetic flux source 5 that can move in the left-right direction (Y-axis direction) above the lower coil 4D fixed to the lower case 1D. Specifically, FIG. 10A is a top view of the lower case 1D, the lower coil 4D, the magnetic flux source 5, and the fixed-side magnetic flux source 7 when the movable body MB (magnetic flux source 5) is located at the center of the movable range. FIG. 10B is a top view of the lower case 1D, the lower coil 4D, the magnetic flux source 5, and the fixed-side magnetic flux source 7 when the movable body MB (magnetic flux source 5) is located at the right end of the movable range. FIG. 10C is a top view of the lower case 1D, the lower coil 4D, the magnetic flux source 5, and the fixed-side magnetic flux source 7 when the movable body MB (magnetic flux source 5) is located at the left end of the movable range.

[0045] As shown in FIG. 2, one of the components of the driving means DM, the coil 4, includes an upper coil 4U fixed to the lower surface (Z2 side) of the upper case 1U and a lower coil 4D fixed to the upper surface (Z1 side) of the lower case 1D.

[0046] As shown in FIGS. 8A and 8B, the lower coil 4D includes three coils (the first lower coil 4D1, the second lower coil 4D2, and the third lower coil 4D3) fixed to the upper surface (the Z1 side surface) of the lower case 1D with an adhesive. Note that the following description with reference to FIGS. 8A and 8B relates to the lower coil 4D, but is similarly 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.

[0047] Each of the three coils constituting the lower coil 4D is wound so as to surround the lower internal space 1DP. Specifically, the first lower coil 4D1 is wound so as to surround the lower left internal space 1DPL, the second lower coil 4D2 is wound so as to surround the central lower internal space 1DPC, and the third lower coil 4D3 is wound so as to surround the lower right internal space 1DPR.

[0048] The first lower coil 4D1 includes a left side bundling portion 4D1L located on the left side (Y1 side) of the lower left internal space 1DPL and extending along the lower left internal space 1DPL, and a right side bundling portion 4D1R located on the right side (Y2 side) of the lower left internal space 1DPL and extending along the lower left internal space 1DPL. Note that the bundling portion means a portion where the conductive wires constituting the coil extend linearly along the front-rear direction (X-axis direction).

[0049] In FIG. 8B, for clarity, the left side bundling portion 4D1L and the right side bundling portion 4D1R in the first lower coil 4D1 are provided with a dot pattern finer than the dot pattern provided on the other portions of the first lower coil 4D1. The same applies to the second lower coil 4D2 and the third lower coil 4D3.

[0050] The second lower coil 4D2 includes a left bundled wire portion 4D2L located on the left side (Y1 side) of the central lower internal space 1DPC and extending along the central lower internal space 1DPC, and a right bundled wire portion 4D2R located on the right side (Y2 side) of the central lower internal space 1DPC and extending along the central lower internal space 1DPC.

[0051] Similarly, the third lower coil 4D3 includes a left bundled wire portion 4D3L located on the left side (Y1 side) of the lower right internal space 1DPR and extending along the lower right internal space 1DPR, and a right bundled wire portion 4D3R located on the right side (Y2 side) of the lower right internal space 1DPR and extending along the lower right internal space 1DPR.

[0052] The left bundled wire portion 4D1L and the right bundled wire 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 applies to the left bundled wire portion 4D2L and the right bundled wire portion 4D2R of the second lower coil 4D2, and the left bundled wire portion 4D3L and the right bundled wire portion 4D3R of the third lower coil 4D3.

[0053] The magnetic flux source 5, which is another component of the driving means DM, is arranged to be movable in the left - right direction (Y - axis direction) within the space between the upper coil 4U and the lower coil 4D as shown in FIGS. 9A to 9C. 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. And each of the left magnet 5L, the first central magnet 5C1, the second central magnet 5C2, and the right magnet 5R is held by a magnetic flux source holding member 6 (see FIG. 9A) at a predetermined interval from each other.

[0054] In the present embodiment, as shown in FIG. 9A, the left magnet 5L is configured such that its width W1 is substantially the same as the width W2 of the right magnet 5R. Also, 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. Further, the left magnet 5L is configured such that its width W1 is approximately half of the width W3 of the first central magnet 5C1.

[0055] In this embodiment, the six coils constituting the coil 4 are configured to have the same shape and the same size. That is, as shown in FIG. 9B, the width W5 of the left bundling portion 4U1L of the first upper coil 4U1, the width W6 of the right bundling portion 4U1R of the first upper coil 4U1, the width W7 of the left bundling portion 4U2L of the second upper coil 4U2, the width W8 of the right bundling portion 4U2R of the second upper coil 4U2, the width W9 of the left bundling portion 4U3L of the third upper coil 4U3, the width W10 of the right bundling portion 4U3R of the third upper coil 4U3, the width W11 of the left bundling portion 4D1L of the first lower coil 4D1, the width W12 of the right bundling portion 4D1R of the first lower coil 4D1, the width W13 of the left bundling portion 4D2L of the second lower coil 4D2, the width W14 of the right bundling portion 4D2R of the second lower coil 4D2, the width W15 of the left bundling portion 4D3L of the third lower coil 4D3, and the width W16 of the right bundling portion 4D3R of the third lower coil 4D3 are all the same size.

[0056] And the left magnet 5L is configured such that its width W1 is substantially the same as the width W5 of the left bundling portion 4U1L of the first upper coil 4U1. Also, 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 bundling portion 4U1R of the first upper coil 4U1 and the width W7 of the left bundling portion 4U2L of the second upper coil 4U2.

[0057] Also, as shown in FIG. 9A, the vibration generating device 101 is configured such that the width WD1 of the magnetic flux source 5 is larger than the width WD2 of the magnetic member MG.

[0058] With this configuration, in the vibration generating device 101, even when the movable body MB (magnetic flux source 5) is located at the center of the movable range, the magnetic member MG can magnetically hold the magnetic flux source 5 so that the magnetic flux source 5 does not move from the center of the movable range due to the attractive force between the magnetic flux source 5 and the magnetic member MG. This effect is similarly realized even when the width WD1 of the magnetic flux source 5 and the width WD2 of the magnetic member MG are the same.

[0059] Further, each of the left magnet 5L, the first central magnet 5C1, the second central magnet 5C2, and the right magnet 5R is arranged such that a virtual plane parallel to the XY plane including the center line CL passing through the center of the vibration generating device 101 serves as the boundary surface between the N-pole portion and the S-pole portion. The same applies to the left fixed-side magnet 7L and the right fixed-side magnet 7R.

[0060] Note that the left fixed-side magnet 7L is configured such that its width W21 is smaller than the width W1 of the left magnet 5L, and the right fixed-side magnet 7R is configured such that its width W22 is smaller than the width W2 of the right magnet 5R.

[0061] Further, as shown in FIG. 9A, the vibration generating device 101 is configured such that the height H1 of the central magnet 5C, the heights H2 of the left magnet 5L and the right magnet 5R, respectively, and the heights H3 of the left fixed-side magnet 7L and the right fixed-side magnet 7R, respectively, are the same.

[0062] Further, as shown in FIG. 10A, the vibration generating device 101 is configured such that the depth DP1 of the central magnet 5C, the depths DP2 of the left magnet 5L and the right magnet 5R, respectively, and the depths DP3 of the left fixed-side magnet 7L and the right fixed-side magnet 7R, respectively, are the same.

[0063] When the movable body MB (magnetic flux source 5) is located at the center of the movable range, as shown in Fig. 9A, the left magnet 5L is arranged such that the N-pole portion (upper portion) faces the left-side bundle portion 4U1L of the first upper coil 4U1, and the S-pole portion (lower portion) faces the left-side bundle portion 4D1L of the first lower coil 4D1. Also, the first central magnet 5C1 is arranged such that the S-pole portion (upper portion) faces the right-side bundle portion 4U1R of the first upper coil 4U1 and the left-side bundle portion 4U2L of the second upper coil 4U2 respectively, and the N-pole portion (lower portion) faces the right-side bundle portion 4D1R of the first lower coil 4D1 and the left-side bundle portion 4D2L of the second lower coil 4D2 respectively. Also, the second central magnet 5C2 is arranged such that the N-pole portion (upper portion) faces the right-side bundle portion 4U2R of the second upper coil 4U2 and the left-side bundle portion 4U3L of the third upper coil 4U3 respectively, and the S-pole portion (lower portion) faces the right-side bundle portion 4D2R of the second lower coil 4D2 and the left-side bundle portion 4D3L of the third lower coil 4D3 respectively. Also, the right magnet 5R is arranged such that the S-pole portion (upper portion) faces the right-side bundle portion 4U3R of the third upper coil 4U3, and the N-pole portion (lower portion) faces the right-side bundle portion 4D3R of the third lower coil 4D3.

[0064] Also, as shown in Fig. 9A, the left magnet 5L is arranged such that the N-pole portion (upper portion) faces the N-pole portion (upper portion) of the left fixed-side magnet 7L with a gap G1L therebetween, and the S-pole portion (lower portion) faces the S-pole portion (lower portion) of the left fixed-side magnet 7L with a gap G1L therebetween. Similarly, the right magnet 5R is arranged such that the S-pole portion (upper portion) faces the S-pole portion (upper portion) of the right fixed-side magnet 7R with a gap G1R therebetween, and the N-pole portion (lower portion) faces the N-pole portion (lower portion) of the right fixed-side magnet 7R with a gap G1R therebetween.

[0065] When a current flows through the lower coil 4D as indicated by the dashed arrow in Fig. 10B, the movable body MB (flux source 5) slides in the right direction (Y2 direction) while being guided by the guide means GM. Specifically, when a current flows counterclockwise in the first lower coil 4D1 in top view, a current flows clockwise in the second lower coil 4D2 in top view, and a current flows counterclockwise in the third lower coil 4D3 in top view, the movable body MB (flux source 5) slides in the right direction (Y2 direction).

[0066] The Lorentz force acts on the charged particles moving within the conductive wire forming the lower coil 4D fixed to the lower case 1D, and due to the reaction force, the left magnet 5L, the first central magnet 5C1, the second central magnet 5C2, and the right magnet 5R as the flux source 5 are moved in the right direction.

[0067] Similarly, when a current flows through the lower coil 4D as indicated by the dashed arrow in Fig. 10C, the movable body MB (flux source 5) slides in the left direction (Y1 direction) while being guided by the guide means GM. Specifically, when a current flows clockwise in the first lower coil 4D1 in top view, a current flows counterclockwise in the second lower coil 4D2 in top view, and a current flows clockwise in the third lower coil 4D3 in top view, the movable body MB (flux source 5) slides in the left direction (Y1 direction).

[0068] When the movable body MB (magnetic flux source 5) moves in the right direction (Y2 direction), as shown in FIG. 9B, a part of the right magnet 5R protrudes to the right of the right end RE of the inner surface of the magnetic member MG (the surface facing the coil 4). Specifically, a part of the right magnet 5R protrudes to the right of the right end URE of the inner surface of the upper magnetic member 1UM and also protrudes to the right of the right end DRE of the inner surface of the lower magnetic member 1DM. And since an attractive force acts between the right magnet 5R and the magnetic member MG, a portion 5Ra of the right magnet 5R that protrudes to the right of the right end RE of the inner surface of the magnetic member MG is attracted leftward by the right end RE of the inner surface of the magnetic member MG. In this state, the right end RE of the inner surface of the magnetic member MG is the part of the magnetic member MG that is at the position closest to the portion 5Ra. In FIG. 9B, a part of the magnetic force lines (the magnetic force lines extending between the portion 5Ra and the right end RE) representing the magnetic field that generates the attractive force attracting the right magnet 5R to the magnetic member MG is shown by a dotted line. Also, in FIG. 9B, for clarity, the illustration of the magnetic force lines representing other parts of the magnetic field generated by the magnetic flux source 5 is omitted.

[0069] Also, when the movable body MB (magnetic flux source 5) moves in the right direction (Y2 direction), as shown in FIG. 9B, the left end portion of the magnetic member MG protrudes to the left of the left end of the left magnet 5L. Specifically, the left end portions of the upper magnetic member 1UM and the lower magnetic member 1DM each protrude to the left of the left end of the left magnet 5L. And since an attractive force acts between the left magnet 5L and the magnetic member MG, a portion MGLa of the magnetic member MG that protrudes to the left of the left end of the left magnet 5L attracts the left magnet 5L to the left. In this state, the left end of the left magnet 5L is the part of the left magnet 5L that is at the position closest to the portion MGLa of the magnetic member MG. In FIG. 9B, a part of the magnetic force lines (the magnetic force lines extending between the portion MGLa and the left end of the left magnet 5L) representing the magnetic field that generates the attractive force attracting the left magnet 5L to the magnetic member MG is shown by a dotted line.

[0070] Also, as shown in FIGS. 9B and 10B, when the movable body MB (magnetic flux source 5) moves in the right direction (Y2 direction), the distance G1L between the left magnet 5L and the left fixed-side magnet 7L (see FIGS. 9A and 10A) expands to the distance G2L, while the distance G1R between the right magnet 5R and the right fixed-side magnet 7R (see FIGS. 9A and 10A) narrows to the distance G2R. As a result, the repulsive force acting between the right magnet 5R and the right fixed-side magnet 7R increases, and the right fixed-side magnet 7R pushes the right magnet 5R in the left direction when the electromagnetic force (driving force) weakens.

[0071] In this way, the movable body MB (magnetic flux source 5) displaced rightward from the center of the movable range receives a force (attractive force and repulsive force) that attempts to return the movable body MB (magnetic flux source 5) to the center of the movable range. And when the force (electromagnetic force) that attempts to move the movable body MB in the right direction disappears, that is, when the current flowing through the coil 4 disappears, the movable body MB (magnetic flux source 5) displaced rightward from the center of the movable range moves leftward by that force (attractive force and repulsive force) and returns toward the center of the movable range.

[0072] Conversely, when the movable body MB (magnetic flux source 5) moves in the left direction (Y1 direction), as shown in FIG. 9C, a part of the left magnet 5L protrudes to the left of the left end LE of the inner surface (the surface facing the coil 4) of the magnetic member MG. And since an attractive force acts between the left magnet 5L and the magnetic member MG, the portion 5La of the left magnet 5L that protrudes to the left of the left end LE of the inner surface of the magnetic member MG is attracted rightward by the left end LE of the inner surface of the magnetic member MG. In this state, the left end LE of the inner surface of the magnetic member MG is the part of the magnetic member MG that is closest to the portion 5La. In FIG. 9C, a part of the magnetic force lines (the magnetic force lines extending between the portion 5La and the left end LE) representing the magnetic field that generates the attractive force attracting the left magnet 5L to the magnetic member MG is shown as a dotted line. Also, in FIG. 9C, for clarity, the illustration of the magnetic force lines representing the other parts of the magnetic field generated by the magnetic flux source 5 is omitted.

[0073] Also, when the movable body MB (flux source 5) moves in the left direction (Y1 direction), as shown in FIG. 9C, the right end portion of the magnetic member MG protrudes to the right of the right end of the right magnet 5R. Specifically, the right end portions of the upper magnetic member 1UM and the lower magnetic member 1DM each protrude to the right of the right end of the right magnet 5R. And since an attractive force acts between the right magnet 5R and the magnetic member MG, a portion MGRa of the magnetic member MG that protrudes to the right of the right end of the right magnet 5R attracts the right magnet 5R to the right. In this state, the right end of the right magnet 5R is the part of the right magnet 5R that is at the position closest to the portion MGRa of the magnetic member MG. Note that in FIG. 9C, a part of the magnetic force lines (magnetic force lines extending between the portion MGRa and the right end of the right magnet 5R) representing the magnetic field that generates the attractive force attracting the right magnet 5R to the magnetic member MG is shown by dotted lines.

[0074] Also, as shown in FIGS. 9C and 10C, when the movable body MB (flux source 5) moves in the left direction (Y1 direction), the distance G1R (see FIGS. 9A and 10A) between the right magnet 5R and the right fixed-side magnet 7R expands to the distance G3R, while the distance G1L (see FIGS. 9A and 10A) between the left magnet 5L and the left fixed-side magnet 7L narrows to the distance G3L. As a result, the repulsive force acting between the left magnet 5L and the left fixed-side magnet 7L strengthens, and the left fixed-side magnet 7L pushes the left magnet 5L in the right direction when the electromagnetic force (driving force) weakens.

[0075] In this way, the movable body MB (flux source 5) displaced leftward from the center of the movable range receives a force (attractive force and repulsive force) that tries to return the movable body MB (flux source 5) to the center of the movable range. And when the force (electromagnetic force) that tries to move the movable body MB in the left direction disappears, that is, when the current flowing through the coil 4 disappears, the movable body MB (flux source 5) displaced leftward from the center of the movable range moves rightward by that force (attractive force and repulsive force) and returns toward the center of the movable range.

[0076] Therefore, when the supply of current to the coil 4 is stopped, the movable body MB located at a position deviated from the center of the movable range is returned to the center of the movable range by the attractive force between the magnetic flux source 5 and the magnetic member MG. In this way, the driving means DM can vibrate the movable body MB in the left - right direction.

[0077] As described above, the vibration generating device 101 according to the embodiment of the present invention includes, for example, as shown in FIGS. 1A and 2, a housing HS as a fixed body, a movable body MB housed in the housing HS, a guide means GM for guiding the movable body MB to reciprocate along the left - right direction in the housing HS, a coil 4 composed of conductive wires extending along the front - rear direction (X - axis direction) and arranged side - by - side along the left - right direction (Y - axis direction) and fixed to the housing HS so as to intersect the magnetic flux generated by the magnetic flux source 5, a magnetic flux source 5 as a movable - side magnetic flux generating member fixed to the movable body MB (magnetic flux source holding member 6) such that the N - pole portion and the S - pole portion are arranged in the up - down direction (Z - axis direction) and generating magnetic flux along the up - down direction, and a fixed - side magnetic flux source 7 as a fixed - side magnetic flux generating member fixed to the housing HS (side case 2) such that the N - pole portion and the S - pole portion are arranged in the up - down direction and generating magnetic flux along the up - down direction. And, the N - pole portion of the left - hand magnet 5L, which is one of the magnetic flux sources 5, is arranged to face the N - pole portion of the left - hand fixed - side magnet 7L, which is one of the fixed - side magnetic flux sources 7, in the left - right direction, and the S - pole portion of the left - hand magnet 5L is arranged to face the S - pole portion of the left - hand fixed - side magnet 7L in the left - right direction. Also, the N - pole portion of the right - hand magnet 5R, which is another one of the magnetic flux sources 5, is arranged to face the N - pole portion of the right - hand fixed - side magnet 7R, which is another one of the fixed - side magnetic flux sources 7, in the left - right direction, and the S - pole portion of the right - hand magnet 5R is arranged to face the S - pole portion of the right - hand fixed - side magnet 7R in the left - right direction.

[0078] Note that the magnetic flux source 5 as the movable - side magnetic flux generating member is also referred to as the "driving movable magnet" that constitutes the driving means DM. Also, the fixed - side magnetic flux source 7 as the fixed - side magnetic flux generating member is also referred to as the "regulating fixed magnet" that regulates the movement of the movable body MB in the left - right direction.

[0079] With this configuration, the vibration generator 101 can utilize the magnetic spring (the repulsive force between the magnetic flux source 5 and the fixed-side magnetic flux source 7) to return the movable body MB moved by the electromagnetic force toward the center of the movable range. Therefore, the vibration generator 101 can return the movable body MB moved by the electromagnetic force toward the center of the movable range without using a spring member.

[0080] As shown in FIG. 9A, the magnetic flux source 5 as the movable-side magnetic flux generating member may be configured to include a plurality of movable-side magnets (left magnet 5L, center magnet 5C, and right magnet 5R) arranged in the left-right direction. Further, the fixed-side magnetic flux source 7 as the fixed-side magnetic flux generating member may be configured to include a left fixed-side magnet 7L facing the left movable-side magnet (left magnet 5L) arranged at the left end of the plurality of movable-side magnets in the left-right direction, and a right fixed-side magnet 7R facing the right movable-side magnet (right magnet 5R) arranged at the right end of the plurality of movable-side magnets in the left-right direction.

[0081] In this case, the N-pole portion of the left magnet 5L is arranged to face the N-pole portion of the left fixed-side magnet 7L in the left-right direction, and the S-pole portion of the left magnet 5L is arranged to face the S-pole portion of the left fixed-side magnet 7L in the left-right direction. Further, the N-pole portion of the right magnet 5R is arranged to face the N-pole portion of the right fixed-side magnet 7R in the left-right direction, and the S-pole portion of the right magnet 5R is arranged to face the S-pole portion of the right fixed-side magnet 7R in the left-right direction.

[0082] Specifically, in the vibration generator 101, as shown in the upper part of FIG. 11, a magnetic spring MS is formed by the magnetic flux source 5 and the fixed-side magnetic flux source 7 arranged such that the N-pole portion and the S-pole portion are arranged in the up-down direction (Z-axis direction). Therefore, the vibration generator 101 can suppress a decrease in the driving force as compared with the case where a magnetic spring MSA is formed by the movable-side magnet 50 and the fixed-side magnet 70 arranged such that the N-pole portion and the S-pole portion are arranged in the left-right direction (Y-axis direction) as shown in the lower part of FIG. 11.

[0083] FIG. 11 is a diagram for explaining the difference between the magnetic spring MS and the magnetic spring MSA. Specifically, the upper part of FIG. 11 is a cross-sectional view of the coil 4, the magnetic flux source 5, and the fixed-side magnetic flux source 7, corresponding to FIG. 9A. The upper part of FIG. 11 shows the magnetic spring MS constituted by the combination of the magnetic flux source 5 and the fixed-side magnetic flux source 7 arranged such that the N-pole part and the S-pole part are adjacent in the vertical direction (Z-axis direction) in the vibration generator 101. The lower part of FIG. 11 is a cross-sectional view of the coil 4, the magnetic flux source 5, the movable-side magnet 50, and the fixed-side magnet 70. The lower part of FIG. 11 shows the magnetic spring MSA constituted by the combination of the movable-side magnet 50 and the fixed-side magnet 70 arranged such that the N-pole part and the S-pole part are adjacent in the horizontal direction (Y-axis direction). Specifically, the magnetic spring MSA includes a left magnetic spring MSAL and a right magnetic spring MSAR. The left magnetic spring MSAL is constituted by the combination of the left movable-side magnet 50L and the left fixed-side magnet 70L, and the right magnetic spring MSAR is constituted by the combination of the right movable-side magnet 50R and the right fixed-side magnet 70R.

[0084] Note that in each of the upper and lower parts of FIG. 11, a part of the magnetic force lines representing the magnetic field generated by the left magnet 5L is represented by dotted lines. Specifically, the upper part of FIG. 11 shows a state where the magnetic force lines representing the magnetic field generated by the left magnet 5L cross perpendicularly the left-side bundle part 4U1L of the first upper coil 4U1 and the left-side bundle part 4D1L of the first lower coil 4D1, respectively. On the other hand, the lower part of FIG. 11 shows a state where a part of the magnetic force lines representing the magnetic field generated by the left magnet 5L is distorted under the influence of the magnetic field of the left movable-side magnet 50L and crosses obliquely the left-side bundle part 4U1L and the left-side bundle part 4D1L, respectively.

[0085] That is, the configuration shown in the lower part of FIG. 11 has fewer magnetic fluxes vertically crossing each of the left side wire bundle portions 4U1L and 4D1L compared to the configuration shown in the upper part of FIG. 11. In other words, the movable side magnet 50 as shown in the lower part of FIG. 11 reduces the number of magnetic fluxes vertically crossing the drive coils (left side wire bundle portions 4U1L and 4D1L) among the magnetic fluxes generated by the drive magnet (left side magnet 5L), and reduces the driving force, which is the electromagnetic force generated by the drive magnet and the drive coils.

[0086] On the other hand, the configuration shown in the upper part of FIG. 11 does not reduce the number of magnetic fluxes vertically crossing the drive coils (left side wire bundle portions 4U1L and 4D1L) among the magnetic fluxes generated by the drive magnet (left side magnet 5L), and does not reduce the driving force either.

[0087] In addition, the vibration generating device 101 can omit the movable side magnet 50 that is required in the configuration shown in the lower part of FIG. 11, resulting in the effect of reducing the number of components.

[0088] Each of the plurality of movable side magnets (left side magnet 5L, first central magnet 5C1, second central magnet 5C2, and right side magnet 5R) is preferably a permanent magnet magnetized in two poles along the vertical direction. In the above-described embodiment, the magnetic flux source 5 is composed of four movable side magnets (permanent magnets), but it may be composed of two or three movable side magnets (permanent magnets), or may be composed of five or more movable side magnets (permanent magnets). Note that the plurality of movable side magnets may be electromagnets.

[0089] As shown in FIG. 9A, the height H3 of the fixed side magnetic flux source 7 in the vertical direction (Z-axis direction) may be the same as the height of the magnetic flux source 5 in the vertical direction (the height H1 of the central magnet 5C and the heights H2 of the left side magnet 5L and the right side magnet 5R respectively). Also, as shown in FIG. 10A, the length (depth DP3) of the fixed side magnetic flux source 7 in the front-rear direction (X-axis direction) may be the same as the length of the magnetic flux source 5 in the front-rear direction (the depth DP1 of the central magnet 5C and the depths DP2 of the left side magnet 5L and the right side magnet 5R respectively).

[0090] This configuration brings about the effect that the areas of the opposing surfaces of the pair of magnets constituting the magnetic spring MS are the same, that is, the area of the left surface of the left magnet 5L is the same as the area of the right surface of the left fixed magnet 7L. As a result, it also brings about the effect that a repulsive force can be efficiently applied between the left magnet 5L and the left fixed magnet 7L.

[0091] The widths in the left - right direction (Y - axis direction) of the fixed - side magnetic - flux source 7 (the width W21 of the left fixed - side magnet 7L and the width W22 of the right fixed - side magnet 7R) may be smaller than the widths in the left - right direction of the magnetic - flux source 5 (the width W1 of the left magnet 5L, the width W2 of the first central magnet 5C1, the width W3 of the second central magnet 5C2, and the width W4 of the right magnet 5R), as shown in FIG. 9A.

[0092] This configuration brings about the effect that the width of the vibration - generating device 101 in the left - right direction can be reduced.

[0093] The vibration - generating device 101 may include a magnetic member MG that is fixed to the housing HS and disposed outside the coil 4. In this case, the magnetic member MG may be arranged so as to generate an attractive force that attracts the movable body MB, which is at a position deviated from the center of the movable range of the movable body MB, toward the center of the movable range.

[0094] With this configuration, the vibration - generating device 101 can utilize the attractive force between the magnetic - flux source 5 and the magnetic member MG in addition to the repulsive force between the magnetic - flux source 5 and the fixed - side magnetic - flux source 7, and return the movable body MB moved by the electromagnetic force toward the center of the movable range. Therefore, the vibration - generating device 101 can more reliably return the movable body MB moved by the electromagnetic force toward the center of the movable range without using a spring member.

[0095] In addition, the vibration generating device 101 can suppress the occurrence of the stick-slip phenomenon between the movable body MB and the housing HS as compared with a configuration having the magnetic member MG but not having the magnetic spring MS. That is, the vibration generating device 101 can suppress the occurrence of distortion in the acceleration waveform of the reciprocating movable body MB. The ease of occurrence (occurrence probability) of the stick-slip phenomenon is reduced as the spring constant of the virtual spring (corresponding to the resultant force of the repulsive force and the attractive force) caused by the repulsive force between the magnetic flux source 5 and the fixed-side magnetic flux source 7 and the attractive force between the magnetic flux source 5 and the magnetic member MG increases.

[0096] The vibration generating device 101 may be configured such that when the movable body MB is located at the center of the movable range, the left end of the magnetic member MG is located on the left side of the left end of the magnetic flux source 5 and the right end of the magnetic member MG is located on the right side of the right end of the magnetic flux source 5.

[0097] And the vibration generating device 101 may be configured such that when the movable body MB is located at the left end of the movable range, the left end of the magnetic member MG is located on the right side of the left end of the magnetic flux source 5 (the left end of the left-side magnet 5L), and when the movable body MB is located at the right end of the movable range, the right end of the magnetic member MG is located on the left side of the right end of the magnetic flux source 5 (the right end of the right-side magnet 5R).

[0098] With this configuration, when the movable body MB moves in the left-right direction from the center of the movable range, the vibration generating device 101 can bias the movable body MB toward the center of the movable range by the attractive force between the magnetic flux source 5 and the magnetic member MG.

[0099] As shown in FIG. 2, the coil 4 may include an upper coil 4U disposed above the movable body MB and a lower coil 4D disposed below the movable body MB. Further, the magnetic member MG may include an upper magnetic member 1UM disposed above the movable body MB and a lower magnetic member 1DM disposed below the movable body MB.

[0100] With this configuration, the vibration generating device 101 can increase the driving force by the driving means DM while effectively utilizing the space within the housing HS. However, either one of the upper coil 4U and the lower coil 4D may be omitted. Also, either one of the upper magnetic member 1UM and the lower magnetic member 1DM may be omitted.

[0101] The guiding means GM may include a guiding portion provided on the housing HS and having a guiding surface extending along the left - right direction, and guiding the guided portion 6G slidably. In this case, the guided portion 6G may have a guided surface extending along the left - right direction provided on the movable body MB.

[0102] Specifically, in the vibration generating device 101, as shown in FIG. 5A, the guiding means GM includes an upper front guiding portion 1UGF and an upper rear guiding portion 1UGB provided on the upper case 1U, and a lower front guiding portion 1DGF and a lower rear guiding portion 1DGB provided on the lower case 1D. The guided portion 6G includes a front guided portion 6GF and a rear guided portion 6GB provided on the magnetic flux source holding member 6 constituting the movable body MB. Then, as shown in FIG. 5B, the front guided portion 6GF is assembled to the case 1 such that the upper surface FS1 as the guided surface contacts the tip surface FS2 of the upper front guiding portion 1UGF as the guiding surface, and the lower surface FS3 as the guided surface contacts the tip surface FS4 of the lower front guiding portion 1DGF as the guiding surface. The same applies to the rear guided portion 6GB.

[0103] With this configuration, the vibration generating device 101 can realize the guiding means GM capable of guiding the left - right movement of the guided portion 6G with a small number of parts. Specifically, the vibration generating device 101 can realize the guiding means GM by the upper case 1U and the lower case 1D.

[0104] Further, as shown in FIG. 2, for example, the vibration generator 101 according to the embodiment of the present invention includes a housing HS (see FIG. 1A) as a fixed body having an upper case 1U and a lower case 1D, a movable body MB accommodated in a space between the upper case 1U and the lower case 1D, a guide means GM for guiding the movable body MB to reciprocate along the left - right direction within the housing HS, a magnetic flux source 5 fixed to the movable body MB, and a coil 4 fixed to the housing HS, and includes a drive means DM for applying a driving force in the left - right direction to the movable body MB.

[0105] And, as shown in FIG. 5A, for example, the guide means 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. Further, the guide means GM is configured such that a guided portion 6G formed on the movable body MB (magnetic flux source holding member 6) is slidably guided along the left - right direction by the upper guide portion 1UG and the lower guide portion 1DG.

[0106] Since this vibration generator 101 constitutes the guide means GM by using a part of the upper case 1U and a part of the lower case 1D, it is possible to suppress an increase in the number of parts while including the guide means GM for guiding the movable body MB to reciprocate in the left - right direction within the housing HS. Also, this configuration can suppress the vibration generator 101 from becoming large - sized.

[0107] As shown in FIGS. 5A and 5B, the guide means GM may be configured such that the guided portion 6G is slidably guided along the left - right direction in a space between the upper guide portion 1UG and the lower guide portion 1DG.

[0108] Specifically, for example, as shown in FIG. 5A, the upper guide portion 1UG may include an upper front guide portion 1UGF at the front side of the upper case 1U and an upper rear guide portion 1UGB at the rear side of the upper case 1U. Further, the lower guide portion 1DG may include a lower front guide portion 1DGF at the front side of the lower case 1D and a lower rear guide portion 1DGB at the rear side of the lower case 1D. And the guided portion 6G may include a front guided portion 6GF at the front side of the magnetic flux source holding member 6 that constitutes the movable body MB and a rear guided portion 6GB at the rear side of the magnetic flux source holding member 6 that constitutes the movable body MB.

[0109] More specifically, the magnetic flux source holding member 6 may have a convex front guided portion 6GF formed to protrude forward from its front surface so as to be fitted into a concave space having a substantially rectangular parallelepiped shape formed between the tip of the upper front guide portion 1UGF and the tip of the lower front guide portion 1DGF. Further, the magnetic flux source holding member 6 may have a convex rear guided portion 6GB formed to protrude rearward from its rear surface so as to be fitted into a concave space having a substantially rectangular parallelepiped shape formed between the tip of the upper rear guide portion 1UGB and the tip of the lower rear guide portion 1DGB.

[0110] In this configuration, the guide means GM can suppress the movement of the guided portion 6G in a direction other than the left-right direction (Y-axis direction). That is, the guide means 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).

[0111] The housing HS may include a cylindrical side case 2 with its upper and lower portions open. In this case, as shown in FIGS. 5A and 6A, the upper case 1U may be configured to be positioned in contact with the upper end portion of the side case 2 from above, and the lower case 1D may be configured to be positioned in contact with the lower end portion of the side case 2 from below.

[0112] This configuration enables the desired size of the concave space formed between the tip of the upper rear guide portion 1UGB and the tip of the lower rear guide portion 1DGB to be realized with high precision. Therefore, this configuration can realize smooth sliding of the movable body MB in the left-right direction.

[0113] The upper case 1U and the lower case 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.

[0114] Further, as shown in FIG. 2 for example, the vibration generator 101 according to the embodiment of the present invention includes a housing HS (see FIG. 1A) as a fixed body, a movable body MB housed in the housing HS, and a guide means GM for guiding the movable body MB to reciprocate along the left-right direction in the housing HS, a magnetic flux source 5 fixed to the movable body MB and generating a magnetic flux along the up-down direction, and a coil 4 composed of conductive wires fixed to the housing HS so as to intersect the magnetic flux generated by the magnetic flux source 5, extending along the front-rear direction and arranged side by side along the left-right direction.

[0115] The magnetic flux source 5 includes, for example, a left magnet 5L, at least one central magnet 5C, and a right magnet 5R as shown in FIGS. 3A and 3B. The left magnet 5L, at least one central magnet 5C, and the right magnet 5R are arranged side by side along the left-right direction.

[0116] As shown in FIG. 9A, the coil 4 includes a left coil 4L composed of a left flux line portion intersecting the magnetic flux from the left magnet 5L and a right flux line portion intersecting the magnetic flux from the central magnet 5C, and a right coil 4R composed of a left flux line portion intersecting the magnetic flux from the central magnet 5C and a right flux line portion intersecting the magnetic flux from the right magnet 5R.

[0117] Further, the magnetic flux source 5 may be configured such that the central magnet 5C has a width dimension approximately twice that of the left magnet 5L in the left-right direction, and generates a magnetic flux toward the right flux line portion of the left coil 4L and the left flux line portion of the coil (right coil 4R) adjacent to the right side of the left coil 4L.

[0118] This configuration can reduce the number of components that make up the vibration generating device 101 as compared to the case where the central magnet 5C is configured by arranging two magnets having the same left - right width as the left - hand coil 4L side by side.

[0119] As described above, the preferred embodiments of the present invention have been described in detail. However, the present invention is not limited to the above - described embodiments. Various modifications, substitutions, etc. can be applied without departing from the scope of the present invention. Also, each of the features described with reference to the above - described embodiments may be appropriately combined as long as there is no technical contradiction.

[0120] For example, in the above - described embodiment, the lower case 1D, the upper case 1U, and the side case 2 are formed as separate members independent of each other. However, the side case 2 may be integrated with the lower case 1D or the upper case 1U. For example, the upper case 1U and the side case 2 may be integrated and formed as one part.

[0121] Also, in the above - described embodiment, the magnetic - flux source holding member 6 has a convex front - side guided portion 6GF formed to protrude forward from its front surface so as to be fitted into a concave space which is a substantially rectangular - parallelepiped - shaped space formed between the tip of the upper - front - side guide portion 1UGF and the tip of the lower - front - side guide portion 1DGF. Further, the magnetic - flux source holding member 6 has a convex rear - side guided portion 6GB formed to protrude rearward from its rear surface so as to be fitted into a concave space which is a substantially rectangular - parallelepiped - shaped space formed between the tip of the upper - rear - side guide portion 1UGB and the tip of the lower - rear - side guide portion 1DGB. However, the magnetic - flux source holding member 6 may have a concave - shaped guided portion instead of the convex - shaped guided portion 6G. For example, the magnetic - flux source holding member 6 may have a concave - shaped front - side guided portion instead of the convex - shaped front - side guided portion 6GF. In this case, the tip of each of the upper - front - side guide portion 1UGF and the lower - front - side guide portion 1DGF may be bent inward and formed to engage with the concave - shaped front - side guided portion. The same applies to the rear - side guided portion 6GB.

[0122] Further, in the above-described embodiment, the vibration generating device 101 is configured to return the movable body MB moved by electromagnetic force toward the center of the movable range by utilizing the attractive force between the magnetic flux source 5 and the magnetic member MG in addition to the repulsive force between the magnetic flux source 5 and the fixed-side magnetic flux source 7. However, the magnetic member MG may be omitted. In this case, the vibration generating device 101 may be configured to return the movable body MB moved by electromagnetic force toward the center of the movable range by utilizing only the repulsive force between the magnetic flux source 5 and the fixed-side magnetic flux source 7.

[0123] Further, in the above-described embodiment, the guide means GM is constituted by the upper guide portion 1UG and the lower guide portion 1DG. However, the guide means GM may be configured using balls. For example, the guide means GM may be constituted by a plurality of balls disposed between a groove formed on the tip surface of the upper guide portion 1UG and a groove formed on the upper surface of the guided portion 6G, and a plurality of balls disposed between a groove formed on the tip surface of the lower guide portion 1DG and a groove formed on the lower surface of the guided portion 6G.

[0124] Further, in the above-described embodiment, the magnetic flux source 5 is constituted by four permanent magnets magnetized in two poles along the vertical direction, but may be constituted by two four-pole permanent magnets, or may be constituted by one four-pole permanent magnet and two two-pole permanent magnets. Also, the N-pole portion of the left magnet 5L and the S-pole portion of the first central magnet 5C1 may be constituted by one two-pole permanent magnet, and the S-pole portion of the left magnet 5L and the N-pole portion of the first central magnet 5C1 may be constituted by one two-pole permanent magnet. In this case, the N-pole portion of the right magnet 5R and the S-pole portion of the second central magnet 5C2 may be constituted by one two-pole permanent magnet, and the S-pole portion of the right magnet 5R and the N-pole portion of the second central magnet 5C2 may be constituted by one two-pole permanent magnet.

Explanation of Reference Numerals

[0125] 1 ··· Case 1D ··· Lower case 1DG ··· Lower guide part 1DGB ··· Lower rear guide part 1DGF ··· Lower front guide part 1DM ··· Lower magnetic member 1DW ··· Lower frame 1DP ··· Lower internal space 1DPC ··· Central lower internal space 1DPL ··· Lower left internal space 1DPR ··· Lower right internal space 1U ··· Upper case 1UG ··· Upper guide part 1UGB ··· Upper rear guide part 1UGF ··· Upper front guide part 1UM ··· Upper magnetic member 1UW ··· Upper frame 2 ··· Side case 2A ··· Side plate part 2A1 ··· First side plate part 2A2 ··· Second side plate part 2A3 ··· Third side plate part 2A4 ··· Fourth side plate part 2T ··· Female screw hole 2T1 ··· First female screw hole 2T2 ··· Second female screw hole 2T3 ··· Third female screw hole 2T4 ··· Fourth female screw hole 3 ··· Fastening member 3D ··· Lower fastening member 3D1 ··· First lower male screw 3D2 ··· Second lower male screw 3D3 ··· Third lower male screw 3D4 ··· Fourth lower male screw 3U ··· Upper fastening member 3U1 ··· First upper male screw 3U2 ··· Second upper male screw 3U3 ··· Third upper male screw 3U4 ··· Fourth upper male screw 4 ··· Coil 4C ··· Central coil 4D ··· Lower coil 4D1 ··· First lower coil 4D1L ··· Left side bundling part 4D1R ··· Right side bundling part 4D2 ··· Second lower coil 4D2L ··· Left side bundling part 4D2R ··· Right side bundling part 4D3 ··· Third lower coil 4D3L ··· Left side bundling part 4D3R ··· Right side bundling part 4L ··· Left side coil 4R ··· Right side 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 side magnet 5La ··· Part 5R ··· Right side magnet 5Ra ··· Part 6 ··· Magnetic flux source holding member 6G ··· Guided part 6GB ··· Rear guided part 6GF ··· Front guided part 7 ··· Fixed side magnetic flux source 7L ··· Left fixed side magnet 7R ··· Right fixed side magnet 50 ··· Movable side magnet 50L ··· Left movable side magnet 50R ··· Right movable side magnet 70 ··· Fixed side magnet 70L ··· Left fixed side magnet 70R ··· Right fixed side magnet 101 ··· Vibration generating device BS1 ··· Upper surface BS2 ··· Tip surfaceBS3 ··· The following BS4 ··· The front end face BS5 ··· The upper rear face BS6 ··· The inner face BS7 ··· The lower rear face BS8 ··· The inner face BS9 ··· The rear face BS10 ··· The inner face BS11 ··· The outer face BS12 ··· The outer face CTR ··· Control unit DLE ··· The left end DM ··· Driving means DRE ··· The right end FB ··· Frame body FS1 ··· The upper face FS2 ··· The front end face FS3 ··· The lower face FS4 ··· The front end face FS5 ··· The upper front face FS6 ··· The inner face FS7 ··· The lower front face FS8 ··· The inner face FS9 ··· The front face FS10 ··· The inner face FS11 ··· The outer face FS12 ··· The outer face GM ··· Guide means HS ··· Housing LE ··· The left end MB ··· Movable body MG ··· Magnetic member MGLa, MGRa ··· Parts MS, MSA ··· Magnetic spring MSL, MSAL ··· Left magnetic spring MSR, MSAR ··· Right magnetic spring RE ··· The right end ULE ··· The left end URE ··· The right end VA ··· Vibration axis VE ··· Vibration device

Claims

1. A fixed body, a movable body accommodated in the fixed body, guide means for guiding the movable body to reciprocate along the left - right direction within the fixed body, a movable - side magnetic - flux generating member fixed to the movable body such that an N - pole portion and an S - pole portion are arranged in the up - down direction and generating a magnetic flux along the up - down direction, a coil composed of conductive wires extending along the front - rear direction and arranged side - by - side along the left - right direction, and fixed to the fixed body so as to intersect the magnetic flux generated by the movable - side magnetic - flux generating member, a fixed - side magnetic - flux generating member fixed to the fixed body such that an N - pole portion and an S - pole portion are arranged in the up - down direction and generating a magnetic flux along the up - down direction, and comprising: the N - pole portion of the movable - side magnetic - flux generating member is arranged to face the N - pole portion of the fixed - side magnetic - flux generating member in the left - right direction, and the S - pole portion of the movable - side magnetic - flux generating member is arranged to face the S - pole portion of the fixed - side magnetic - flux generating member in the left - right direction, the coils are arranged so as to be arranged in a plurality in the left - right direction, the movable - side magnetic - flux generating member includes a plurality of movable - side magnets arranged side - by - side in the left - right direction, the plurality of movable - side magnets include a left movable - side magnet, a central movable - side magnet, and a right movable - side magnet, the fixed - side magnetic - flux generating member includes a left fixed - side magnet arranged to face the left movable - side magnet arranged at the left end of the plurality of movable - side magnets in the left - right direction, and a right fixed - side magnet arranged to face the right movable - side magnet arranged at the right end of the plurality of movable - side magnets in the left - right direction, the N - pole portion of the left movable - side magnet is arranged to face the N - pole portion of the left fixed - side magnet in the left - right direction, the S - pole portion of the left movable - side magnet is arranged to face the S - pole portion of the left fixed - side magnet in the left - right direction, the N - pole portion of the right movable - side magnet is arranged to face the N - pole portion of the right fixed - side magnet in the left - right direction, and the S - pole portion of the right movable - side magnet is arranged to face the S - pole portion of the right fixed - side magnet in the left - right direction, each of all the plurality of movable - side magnets is a permanent magnet magnetized with two poles in the up - down direction, in the left - right direction, the width of the left movable - side magnet and the width of the right movable - side magnet are approximately one - half of the width of the central movable - side magnet, A vibration generating device, characterized in that.

2. In the left - right direction, the width of the left movable - side magnet and the width of the right movable - side magnet are substantially the same as the width of the bundle portion of the coil, The vibration generating device according to claim 1.

3. The height of the fixed-side magnetic flux generating member in the vertical direction is the same as the height of the movable-side magnetic flux generating member in the vertical direction, and / or, The length of the fixed-side magnetic flux generating member in the front-rear direction is the same as the length of the movable-side magnetic flux generating member in the front-rear direction, and / or, The width of the fixed-side magnetic flux generating member in the left-right direction is smaller than the width of the movable-side magnetic flux generating member in the left-right direction, The vibration generating device according to claim 1 or claim 2.

4. The coil includes an upper coil disposed above the movable body and a lower coil disposed below the movable body. The vibration generating device according to any one of claims 1 to 3.

5. It includes a magnetic member that is fixed to the fixed body and disposed outside the coil, The magnetic member is arranged so as to generate an attractive force that attracts the movable body, which is at a position deviated from the center of the movable range of the movable body, to the center of the movable range. The vibration generating device according to any one of claims 1 to 4.

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