Vibration Generator

Abstract

To provide a vibration generator which enables increase of a generation rate of a vibration force.SOLUTION: A vibration generator 1 includes a frame 20, a holder 50, a coil 40, and a magnet 60. The coil 40 is fixed to the frame 20 and has a flat plate shape. The magnet 60 is disposed at the bottom surface part side of the frame 20 and is disposed facing the coil 40. The magnet 60 is supported by the holder 50 so as to be displaced relative to the frame 20. Protruding parts 75a and 75b protruding toward an inner surface of an upper surface of the frame 20 are provided on an upper surface of the magnet 60 which faces the upper surface of the frame 20.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a vibration generator, and more particularly to a vibration generator that generates vibrations by passing a current through a coil to move a vibrator. [Background technology]

[0002] As a vibration generator that generates vibration by moving a vibrator, various types of vibration generators are used that have a structure in which a vibrator including a magnet is supported by a housing via a spring part. This type of vibration generator has a coil arranged below the magnet so as to face the magnet. The vibrator performs reciprocating motion in a substantially horizontal plane as a magnetic field is generated by passing a current through the coil.

[0003] The following Patent Document 1 discloses a vibration generator having a structure in which a vibrating part having a magnet is supported via a leaf spring. In this vibration generator, one flat coil is arranged so as to face the magnet of the vibrating part. One end of the leaf spring is fixed to the housing by a screw. The other end of the leaf spring is fixed to the weight of the vibrating part by crimping.

[0004] The following Patent Document 2 discloses a vibration generator in which a magnet is attached to a mover block and a coil is wound around a rod-shaped yoke body arranged along the magnet. In this vibration generator, the spring part that supports the mover block and the frame part of the frame are integrally molded from a resin material. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2003-24871 A [Patent Document 2] JP 2010-94567 A Summary of the Invention [Problem to be solved by the invention]

[0006] An object of the present invention is to provide a vibration generator in which a vibrator is unlikely to fall off from a holder. [Means for solving the problem]

[0007] In order to achieve the above object, according to one aspect of the present invention, a vibration generator includes: The bottom plate and A frame, a vibrator having a magnet and a yoke, and a coil, A holder for holding the transducer; an arm connecting the vibrator and the frame, the vibrator being supported by the arm so as to be displaceable relative to the frame; the transducer is displaceable in a direction from the bottom plate toward the frame, and the arm connects the transducer and the frame via the holding portion; The arm extends in a direction intersecting the vibration direction of the vibrator, and the yoke contacts the side surface of the magnet in the direction intersecting the vibration direction of the vibrator. Preferably, the ears of the yoke and the side of the magnet are in contact with each other. 。 Preferably, the yoke forms part of the retainer. The yoke is located inside the outer circumferential surface of the holding part, and the arm is connected to the outer circumferential surface of the holding part. . According to another aspect of the present invention, a vibration generator includes: The bottom plate and A frame, a vibrator having a magnet and a magnetic body, and a coil, A holder for holding the transducer; an elastic body connecting the vibrator and the frame, the vibrator being supported by the elastic body so as to be displaceable relative to the frame; the vibrator is displaceable in a direction from the bottom plate toward the frame, and the elastic body connects the vibrator and the frame via the holding portion; The elastic body extends in a direction intersecting the vibration direction of the vibrator, and the magnetic body is in contact with the side surface of the magnet in the direction intersecting the vibration direction of the vibrator. Preferably, magnetic material The ears of the magnet are in contact with the side of the magnet. 。 Preferably, the magnetic body forms part of the retaining portion. The magnetic body is located inside the outer circumferential surface of the holding portion, and the elastic body is connected to the outer circumferential surface of the holding portion. . [Brief description of the drawings]

[0012] [Figure 1] FIG. 1 is a plan view showing a vibration generator in a first embodiment of the present invention. [Diagram 2]2 is a cross-sectional view taken along line AA in FIG. 1. [Diagram 3] FIG. [Figure 4] 2 is a cross-sectional view of the frame taken along line BB in FIG. 1. [Diagram 5] 5 is a cross-sectional view of the frame taken along line CC in FIG. 4. [Figure 6] 2 is a side cross-sectional view of the yoke taken along line BB in FIG. 1. [Figure 7] FIG. 11 is a plan view showing a vibration generator according to a second embodiment. [Figure 8] 8 is a cross-sectional view taken along line EE in FIG. 7. [Figure 9] FIG. [Figure 10] FIG. [Figure 11] FIG. [Figure 12] FIG. [Figure 13] 13 is a cross-sectional view taken along the line FF in FIG. 12. [Figure 14] FIG. 13 is a plan view showing a vibration generator according to a third embodiment. [Figure 15] 15 is a cross-sectional view taken along line GG in FIG. 14. [Figure 16] FIG. 2 is a perspective view showing a holder and a vibrator. [Figure 17] FIG. 17 is an exploded perspective view of FIG. 16. [Figure 18] FIG. [Figure 19] FIG. [Figure 20] 20 is a cross-sectional view taken along line HH in FIG. 19. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] Hereinafter, a vibration generator according to an embodiment of the present invention will be described.

[0014] The vibration generator has a structure in which a vibrator holding a magnet is supported by a housing so as to be displaceable relative to the housing. A coil is disposed near the vibrator. The vibrator generates a magnetic field for changing at least one of its position and orientation relative to the housing. The vibration generator is a so-called linear type that generates vibration force by reciprocating the vibrator in response to excitation of the coil.

[0015] [First embodiment]

[0016] Fig. 1 is a plan view showing a vibration generator in a first embodiment of the present invention, Fig. 2 is a cross-sectional view taken along line AA in Fig. 1.

[0017] In FIG. 1, holder 50 and the like that are actually hidden by the upper surface of frame 20 are partially shown by solid lines so that the layout of components in vibration generator 1 can be easily understood.

[0018] In the following description, for vibration generator 1, the X-axis direction of the coordinate system shown in Fig. 1 may be referred to as the left-right direction (the positive direction on the X-axis when viewed from the origin is the rightward direction), and the Y-axis direction of the coordinate system shown in Fig. 2 may be referred to as the front-back direction (the positive direction on the Y-axis when viewed from the origin is the rearward direction). Additionally, the Z-axis direction in Fig. 2 (the direction perpendicular to the XY plane in Fig. 1) may be referred to as the up-down direction (the positive direction on the Z-axis when viewed from the origin is the upward direction).

[0019] [Overall structure of vibration generator 1]

[0020] 1, vibration generator 1 broadly includes a double-sided board (an example of a circuit board) 10, a frame (an example of a housing) 20, a bottom plate 30, a coil 40, and a holder 50. In the present embodiment, holder 50 includes four pillars (an example of a fixing portion) 51 (51a, 51b, 51c, 51d), four arm portions 53 (53a, 53b, 53c, 53d), and one vibrator holding portion (hereinafter sometimes simply referred to as a holding portion) 55. A vibrator 80 constituted by a magnet 60 and a yoke 70 is held by holding portion 55.

[0021] Vibration generator 1 is formed as a whole in a thin, generally rectangular parallelepiped shape with relatively small top-to-bottom dimensions. Vibration generator 1 is small, for example, with external dimensions in the left-right and front-to-back directions each being only about 10 to 20 millimeters. Vibration generator 1 has a box-like external shape with front-to-back, left-to-right, and top sides formed by frame 20 and a bottom surface covered by double-sided substrate 10.

[0022] In this embodiment, the frame 20 and the yoke 70 are made of a soft magnetic material such as iron.

[0023] The double-sided substrate 10 is a printed wiring board having patterns on both sides. Two terminals 11 and 12 are provided in the center of the top surface of the double-sided substrate 10. The terminals 11 and 12 are electrically connected to a pattern (not shown) provided on the bottom surface of the double-sided substrate 10. The winding ends of the coil 40 are connected to the terminals 11 and 12 using solder, and electricity can be passed through the coil 40 via the pattern on the bottom surface of the double-sided substrate 10.

[0024] The bottom plate 30 is formed in a rectangular plate shape so as to cover substantially the entire upper surface of the double-sided substrate 10. The bottom plate 30 and the double-sided substrate 10 are fixed to each other, for example, via an adhesive sheet or adhesive. In other words, the double-sided substrate 10 is connected so as to be aligned along the bottom plate 30. An opening 31 is provided in the center of the bottom plate 30 so that the two terminals 11 and 12 are exposed upward. Four joints 33 (33a, 33b, 33c, 33d) are formed on the four sides of the bottom plate 30. As shown in FIG. 2, each joint 33 is formed by bending the bottom plate 30 upward by approximately 90 degrees, and forms an L-shaped cross section together with the part of the bottom plate 30 on the double-sided substrate 10. Each joint 33 is formed so that its outer surface contacts the inner side of the side of the frame 20. The bottom plate 30 is disposed at a position farther away from the vibrator 80 than the coil 40. That is, the bottom plate 30 covers the frame 20 as well as the vibrator 80, the coil 40, and the like.

[0025] In this embodiment, the bottom plate 30 is made of a non-magnetic material. The bottom plate 30 is made of a non-magnetic metal material, such as non-magnetic stainless steel. The bottom plate 30 is not limited to being made of a metal material, and may be made of a resin, for example.

[0026] The frame 20 has a rectangular parallelepiped shape with an open bottom surface. The frame 20 is formed, for example, by drawing an iron plate. In a plan view, the corners (parts between the side surfaces) of the frame 20 are connected with a rounded surface portion sandwiched therebetween. As shown in FIG. 2, the frame 20 is disposed so as to cover the upper surface of the double-sided board 10 from above the double-sided board 10. The frame 20 is fixed to the bottom plate 30 by gluing or welding to each joint 33 such that the inner surface of each side surface contacts the side surface of each joint 33 of the bottom plate 30. In other words, the bottom plate 30 is attached to the frame 20. The frame 20 may be fitted into the joint 33 or fixed to the bottom plate 30 by other methods.

[0027] In this way, vibration generator 1 has a structure surrounded by frame 20, and is therefore less susceptible to the effects of surrounding magnetic fields, etc. Furthermore, magnetic flux within vibration generator 1 is less likely to leak to the outside, preventing the influence on external devices, circuits, etc.

[0028] Furthermore, vibration generator 1 is surrounded by frame 20 and bottom plate 30 in a box shape, which increases the rigidity of vibration generator 1 itself. Therefore, vibration generator 1 can reliably generate vibration. Furthermore, vibration generator 1 is easy to handle when attaching it to an external device or the like.

[0029] The coil 40 is an air-core coil that is generally elliptical and flat, and is formed by winding a conductor wire, for example. That is, the coil 40 is a thin coil whose dimension in the winding axis direction is smaller than the dimension in the direction perpendicular to the winding axis direction. The coil 40 may be formed by slicing a wound metal foil, or may be formed by stacking sheet coils. The coil 40 may also have a circular or polygonal shape, such as a rectangular shape, in a plan view.

[0030] As shown in Fig. 2, coil 40 is disposed on the upper surface of bottom plate 30 with the winding axis direction being the up-down direction. As shown in Fig. 1, coil 40 is disposed in the center of vibration generator 1 in a plan view, facing vibrator 80 as described below. Coil 40 and bottom plate 30 are insulated. Both of the two winding ends of coil 40 are wired from the inside of coil 40 to the upper surface side of double-sided substrate 10 through opening 31, and are connected to terminals 11 and 12.

[0031] Holder 50 is integrally molded together with magnet 60 and yoke 70 by insert molding. That is, holder 50 and vibrator 80 are integrally molded. In the present embodiment, columnar body 51, arm portion 53, and holding portion 55 are integrally molded using an elastic body (an example of resin). For example, fluorine-based or silicon-based rubber that is resistant to heat can be used as the elastic body. By forming holder 50 using such rubber, it is possible to improve the heat resistance of vibration generator 1. The elastic body is not limited to this, and various elastic bodies can be used.

[0032] [Structure of holder 50 and transducer 80]

[0033] FIG. 3 is a perspective view showing the holder 50. As shown in FIG.

[0034] The holder 50 shown in Fig. 3 shows a state in which the magnet 60 and the yoke 70 are not attached to the holding portion 55. That is, in this embodiment, the holder 50 is integrally molded with the vibrator 80 constituted by the magnet 60 and the yoke 70, but in Fig. 3, the vibrator 80 is not shown at this portion, and only the holder 50 portion constituted by an elastic body is shown.

[0035] Each of the pillars 51 has a cylindrical shape with a height direction being the up-down direction. The height of each of the pillars 51 is slightly smaller than the vertical dimension of the inside of the frame 20.

[0036] 1, the four pillars 51 are disposed at positions that correspond to the four corners of the holder 50 in a plan view. The pillars 51 are disposed on the rounded portions of the side surfaces of the frame 20.

[0037] 1 and 2, the transducer 80 has a plate shape parallel to a horizontal plane (the XY plane in FIG. 1). The transducer 80 is formed in a substantially rectangular shape with each side parallel to the front-rear or left-right direction in a plan view.

[0038] 1, vibrator 80 is disposed in the center of holder 50 in a plan view, i.e., in the center of vibration generator 1. As shown in FIG 2, vibrator 80 is disposed substantially parallel to coil 40 and faces opposite coil 40.

[0039] The magnet 60 is a permanent magnet and has a thin rectangular parallelepiped shape. For example, the magnet 60 is magnetized into two poles, an N pole and an S pole, separated in the front-rear direction, at the bottom side portion facing the coil 40. The yoke 70 is a magnetic plate that is rectangular in plan view and is attached so as to cover the upper surface of the magnet 60. The upper surface of the yoke 70 is disposed so as to face the inner surface of the upper surface of the frame 20. The yoke 70 has ears 71 and 72 that partially protrude in the left-right direction from the left and right sides, respectively. The yoke 70 and the magnet 60 are joined to each other by, for example, spot welding or adhesive bonding, to form an integrated vibrator 80. With the yoke 70 and the magnet 60 joined, the vibrator 80 and the holder 50 are molded integrally by insert molding. The upper surface of the yoke 70 is provided with protrusions 75a and 75b.

[0040] As shown in Fig. 3, the holding part 55 has a rectangular frame shape that forms a substantially rectangular hole 55a in which the vibrator 80 is disposed. Here, the holding part 55 is formed with two protruding parts 55b, 55c that protrude laterally in the left and right direction. As shown in Fig. 2, the yoke 70 is disposed together with the magnet 60 such that the ears 71, 72 are embedded in the protruding parts 55b, 55c, respectively. With this structure, the vibrator 80 is configured to be unlikely to fall off the holding part 55.

[0041] Each of the four arm portions 53 is formed so as to connect each corner of the holding portion 55 to the columnar body 51 closest to that corner. Each arm portion 53 is formed in the shape of a beam extending in the left-right direction. As shown in FIG. 2, the width direction (front-rear direction) dimension of the arm portion 53 is smaller than the vertical direction (up-down direction) dimension. Since each arm portion 53 is formed of an elastic body, it is easy to bend in the front-rear direction. Note that the relationship between the width direction dimension and the vertical direction dimension of each arm portion 53 is not limited thereto. The width direction dimension of each arm portion 53 may be equal to the vertical direction dimension or may be larger than the vertical direction dimension.

[0042] Since each of the four arm portions 53 is formed to be easily flexible in the front-rear direction, the vibrator 80 is mainly displaceable in the front-rear direction relative to the columnar body 51. That is, the vibrator 80 is supported by the arm portions 53 so as to be displaceable in a direction substantially parallel to the horizontal plane.

[0043] Holder 50 is attached to frame 20 by fixing each of four pillars 51 to frame 20. This forms the basic structure of vibration generator 1 in which vibrator 80 is supported displaceably with respect to frame 20 by holder 50 which is integrally molded separately from frame 20.

[0044] In vibration generator 1, coil 40 generates a magnetic field for reciprocating vibrator 80 relative to frame 20. That is, when a current flows through coil 40, coil 40 is excited, and a magnetic field is generated in the vertical direction. When a magnetic field is generated, magnet 60 is affected by this magnetic field and a repulsive or attractive force is generated, so that a force that displaces vibrator 80 forward or backward acts on vibrator 80 according to the direction of the magnetic field and the arrangement of the magnetic poles of magnet 60. Therefore, vibrator 80 displaces in either the front-rear direction while bending each arm portion 53. Therefore, when an alternating current is applied to coil 40, vibrator 80 performs a reciprocating linear motion in the front-rear direction relative to frame 20 in a plan view according to the alternating current. As a result, vibration generator 1 generates a vibration force.

[0045] When the AC current value decreases and the magnetic field weakens or disappears, the restoring force of arm portion 53 causes vibrator 80 to return to the center of vibration generator 1 in a plan view. At this time, since arm portion 53 is an elastic body, the energy consumed by arm portion 53 becomes relatively large. Therefore, the vibration is quickly damped.

[0046] In the present embodiment, bottom plate 30 is made of a non-magnetic material, so that no magnetic attraction force is generated between vibrator 80 and bottom plate 30 by magnet 60. Vibrator 80 is displaced smoothly and efficiently in response to the magnetic field generated by coil 40. Therefore, vibration generator 1 can be made thinner and can operate properly.

[0047] [Attachment structure of holder 50 to frame 20]

[0048] In the present embodiment, the columnar body 51 is attached to the frame 20 by engaging with the engaging portions 21 (21a, 21b, 21c, 21d) provided on the frame 20. This allows the holder 50 to be easily attached to the frame 20.

[0049] Fig. 4 is a cross-sectional view of the frame 20 taken along line BB in Fig. 1. Fig. 5 is a cross-sectional view of the frame 20 taken along line CC in Fig. 4.

[0050] 5, in this embodiment, the engagement portions 21 are provided at the corners of the frame 20 in a plan view. Each of the four engagement portions 21 has two claw portions 22, 23: a first claw portion 22 (22a, 22b, 22c, 22d) and a second claw portion 23 (23a, 23b, 23c, 23d).

[0051] 4, in each engagement portion 21, the two claw portions 22, 23 are each formed by providing a U-shaped cutout in a portion of the side surface of the frame 20 and pressing the inside of the cutout toward the inside of the frame 20. Therefore, each claw portion 22, 23 is molded integrally with the frame 20. By forming each claw portion 22, 23 in this manner, gaps 25 (25a, 25b, 25c, 25d) are partially provided on the side surface of the frame 20.

[0052] In this embodiment, the claws 22, 23 are formed in a shape corresponding to the shape of the columnar body 51. That is, while the columnar body 51 is cylindrical, the claws 22, 23 are formed in a shape that follows the side peripheral surface of the columnar body 51. As shown in Fig. 5, each engagement portion 21 is formed such that, in a plan view, the R-shaped portion between the claws 22, 23 and the side surface of the frame 20 surrounds at least half of the outer peripheral surface of the columnar body 51 disposed in that engagement portion 21.

[0053] When placing the holder 50 on the frame 20, first, the four pillars 51 are fitted into the four engagement parts 21. As a result, each pillar 51 is sandwiched between the claw parts 22, 23 of the engagement part 21. In other words, the side peripheral surface of each pillar 51 is held by the claw parts 22 and 23 of the engagement part 21. By engaging the pillars 51 with the engagement parts 21 in this way, the pillars 51 are fixed to the frame 20, and the holder 50 is attached to the frame 20.

[0054] Each of the claws 22, 23 is crimped to the columnar body 51 with each columnar body 51 fitted in the engagement portion 21. For example, as shown by the arrow in Fig. 5, for example, with respect to the engagement portion 21d, the first claw 22d is pushed forward (downward in Fig. 5) and the second claw 23d is pushed rightward (rightward in Fig. 5). By crimping the claws 22, 23 in this manner, the claws 22, 23 bite into each columnar body 51, and the columnar body 51 is fixed to the frame 20 more firmly.

[0055] In conventional vibration generators, the vibrator is supported by a leaf spring attached to the housing. For example, the leaf spring is attached to the housing by a screw, and the structure of the attachment part of the leaf spring to the housing side is complicated. Therefore, the assembly man-hours of the vibration generator are complicated, the number of parts is increased, and the manufacturing cost of the vibration generator is increased. Such a problem is more prominent as the demand for miniaturization and thinning of the vibration generator increases. That is, as the vibration generator is miniaturized, the components are also miniaturized, and it is necessary to use an attachment method such as spot welding instead of screw fastening or crimping, and the structure of the attachment part between the parts becomes complicated. For example, when spot welding is performed on the attachment part between the leaf spring and the housing, it is necessary to weld many parts in order to maintain the reliability of the vibration generator at a high level, and the manufacturing may be time-consuming. This is because the spot-welded part is relatively fragile against impact force. In response to such a problem, in the conventional structure in which the spring part and the frame part of the frame are integrally molded, the above-mentioned problem regarding the joining method of the spring part and the housing does not occur in the first place. In this case, however, there is a problem in that the material used for the housing is limited to one that can be molded integrally with the spring portion.

[0056] To address such problems, in the present embodiment, holder 50 including columnar body 51 is integrally molded, and holder 50 is attached to frame 20 by fitting columnar body 51 into engagement portion 21. Holder 50 can be easily attached to frame 20, and the number of parts can be kept small, so that the manufacturing cost of vibration generator 1 can be reduced. Furthermore, since holder 50 and frame 20 are each integrally formed, the attachment portion between holder 50 and frame 20 does not become brittle. Therefore, the reliability of vibration generator 1 against impact can be improved. Since no separate member such as a screw is required to attach holder 50 to frame 20, vibration generator 1 can be made smaller, thinner, and lighter.

[0057] When using a conventional structure in which the spring portion supporting the vibrator and the housing are integrally molded from resin, there is a problem in selecting the material, as the spring portion and the housing must be made of the same material. However, in this embodiment, the holder 50 and the frame 20 are made of separate members, so the number of parts is reduced. In addition, while having a simple structure that can be easily assembled, the material of the frame 20 can be appropriately selected. Therefore, the frame 20 can be configured to fulfill its role without providing a separate member that functions as a magnetic circuit or a magnetic shield.

[0058] Holder 50 is configured by integrally molding columnar body 51, arm portion 53, and vibrator holding portion 55 with an elastic body. This reduces the number of parts and enables holder 50 to be manufactured easily. In the present embodiment, magnet 60 and yoke 70 are insert molded together with holder 50, so that holder 50 holding vibrator 80 can be easily configured, and the manufacturing process of vibration generator 1 can be further simplified.

[0059] The engagement portion 21 is formed integrally with the frame 20 by providing a notch in a part of the side surface of the frame 20 to form the claw portions 22, 23. This allows the number of parts to be reduced, and the manufacturing cost to be further reduced.

[0060] The mounting structure of holder 50 to frame 20 is such that cylindrical pillar body 51 is gripped by two claw portions 22, 23. Therefore, while simplifying the structure of vibration generator 1, pillar body 51 can be reliably positioned on frame 20, and the mounting accuracy of holder 50 to frame 20 can be improved. Since claw portions 22, 23 are crimped to pillar body 51, holder 50 can be more firmly mounted to frame 20.

[0061] The mounting structure of the vibrator 80 to the holder 50, i.e., the mounting structure of the magnet 60 and the yoke 70 to the holder 50, is not limited to insert molding. For example, the magnet 60 and the yoke 70 joined to each other by welding or the like may be incorporated into the integrally molded holder 50, and then adhesively bonded. Also, the holder 50 and the yoke 70 may be integrally formed, and then the magnet 60 may be attached to the yoke 70.

[0062] [York 70 Structure]

[0063] Vibrator 80 moves under the influence of a magnetic field generated by a coil arranged below, and may be displaced in the vertical direction or tilted from the horizontal plane (in this sense, the movement of vibrator 80 does not strictly speaking take place within a horizontal plane. However, the amount of vertical displacement and the amount of change in posture of vibrator 80 are relatively small, and such movement of vibrator 80 may be expressed as "moving in the horizontal direction" from a macroscopic perspective). Furthermore, when an external force is applied to vibration generator 1, vibrator 80 may be displaced in the vertical direction relative to frame 20. Vibration generator 1 has a thin structure, and the gap between frame 20 and the upper surface of vibrator 80 is relatively narrow. Therefore, when vibrator 80 is displaced in the vertical direction or tilted relative to frame 20 in this manner, the upper part of vibrator 80 may come into contact with the inner surface of the upper surface of frame 20.

[0064] In this embodiment, when vibrator 80 is displaced or tilted in the vertical direction relative to frame 20, two protrusions 75a, 75b on the upper surface of yoke 70 come into contact with frame 20.

[0065] As shown in FIG. 1, the protrusions 75a and 75b are provided so as to protrude from the upper surface of the yoke 70 toward the inner surface of the upper surface of the frame 20. The protrusions 75a and 75b are provided at two locations symmetrical to each other with respect to a plane (a plane parallel to the ZX plane) that passes through the center of the vibrator 80 and is perpendicular to the front-rear direction, which is the motion direction of the vibrator 80. The protrusions 75a and 75b are also located at two locations on a plane that passes through the center of the vibrator 80 and is parallel to the YZ plane. That is, in this embodiment, the protrusion 75a is provided at the rear of the left-right center of the upper surface of the vibrator 80. The protrusion 75b is provided at a position symmetrical to the protrusion 75a, in the front of the left-right center of the upper surface of the vibrator 80.

[0066] FIG. 6 is a side cross-sectional view of the yoke 70 taken along line BB in FIG.

[0067] As shown in FIG. 6, in this embodiment, each of the protrusions 75a and 75b has a curved shape that is convex upward (to the right in FIG. 6). In other words, each of the protrusions 75a and 75b has a curved shape that is convex toward the inner surface of the upper surface of the frame 20. The surface shape of each of the protrusions 75a and 75b is formed, for example, to be a substantially spherical shape (a substantially arc shape in the cross section shown in FIG. 6). Each of the protrusions 75a and 75b is formed by being pushed upward from the flat plate-shaped yoke 70 by pressing or sheet metal processing. That is, each of the protrusions 75a and 75b is formed integrally with other parts of the yoke 70. Note that each of the protrusions 75a and 75b is not limited to such a structure. For example, each of the protrusions 75a and 75b may be provided by attaching a member formed separately from the main body of the yoke 70 to the upper surface of the yoke 70. Alternatively, each of the protrusions 75a and 75b may be formed by applying a different liquid material (such as an epoxy resin material or molten metal) to the upper surface of the yoke 70 and then hardening or solidifying it.

[0068] In this manner, in the present embodiment, since the protrusions 75a and 75b are provided on the upper surface of the yoke 70, even if the vibrator 80 approaches the frame 20, the protrusions 75a or 75b contact the frame 20 first. The parts that contact the frame 20 are limited to the protrusions 75a and 75b, so the area of ​​contact with the frame 20 is limited. Therefore, when the protrusions 75a and 75b of the vibrator 80 contact the frame 20, the frictional force acting on the vibrator 80 is reduced, and the influence on the operation of the vibrator 80 is reduced. The vibration generator 1 that can operate properly can be made thinner. In addition, since the frictional force acting on the vibrator 80 can be reduced, the power consumption of the vibration generator 1 can be reduced. The operation of the vibrator 80 can be prevented from being hindered by contact with the frame 20, and the vibrator 80 can be operated smoothly.

[0069] The protrusions 75a, 75b are disposed symmetrically with respect to the direction of motion (vibration direction) of the vibrator 80. Therefore, when the vibrator 80 comes into contact with the frame 20 during vibration of the vibrator 80, the protrusions 75a, 75b are surely in contact with the frame 20, and other portions are unlikely to come into contact with the frame 20. Therefore, the effect of the vibrator 80 coming into contact with the frame 20 on the operation of the vibrator 80 can be surely reduced.

[0070] Since each of the protrusions 75a, 75b has a spherical shape that is convex toward the inner surface of the upper surface of the frame 20, each of the protrusions 75a, 75b and the frame 20 come into point contact with each other. Therefore, the frictional force acting on the vibrator 80 can be reliably reduced, and the vibrator 80 can be reliably operated.

[0071] [Second embodiment]

[0072] The basic configuration of the vibration generator in the second embodiment is the same as that in the first embodiment, and therefore description thereof will not be repeated here. The second embodiment differs from the first embodiment mainly in that the vibrator has a weight and that a flexible printed circuit board is used.

[0073] Fig. 7 is a plan view showing vibration generator 201 according to the second embodiment, and Fig. 8 is a cross-sectional view taken along line EE in Fig. 7.

[0074] 7, similarly to Fig. 1, the holder 250 and other components that are actually hidden by the upper surface of the frame 20 are partially shown by solid lines. Also, in Fig. 7, the illustration of the substrate 210 (shown in Fig. 8 and other figures) is omitted.

[0075] Vibration generator 201 has a structure which differs from vibration generator 201 of the first embodiment mainly in that it has holder 250 instead of holder 50, and in that it has substrate 210 having a different structure instead of double-sided substrate 10.

[0076] 7, holder 250 has four pillars 51 and four arm portions 53, similar to holder 50. Holder 250 also has oscillator holding portion (hereinafter sometimes referred to as holding portion) 255 having a shape different from oscillator holding portion 55. Magnet 60, weights 281 and 282, and yoke 270 are attached to oscillator holding portion 255. That is, in the second embodiment, magnet 60, weights 281 and 282, and yoke 270 configure oscillator 280 of vibration generator 201.

[0077] As shown in FIG. 8, substrate 210 is a flexible printed circuit board (FPC) and is arranged to sandwich bottom plate 230. In other words, substrate 210 is arranged to cover a portion of each of both sides of bottom plate 230. In this embodiment, bottom plate 230 has a flat plate shape. Bottom plate 230 is fitted into a portion on the bottom side of frame 20 and fixed to frame 20. A notch 235 is provided on a right edge portion (an example of a portion of the periphery) of bottom plate 230. As a result, when bottom plate 230 is fixed to frame 20, the inside and outside of vibration generator 201 communicate with each other at the portion where notch 235 is provided.

[0078] The bottom plate 230 is made of a non-magnetic material such as non-magnetic stainless steel. Since the vibration generator 201 is surrounded by the frame 20 and the bottom plate 230, which are made of a metallic material, the vibration generator 201 becomes easier to handle and the durability of the vibration generator 201 is also increased.

[0079] The substrate 210 has an upper surface portion 216 disposed along the upper surface of the bottom plate 230, and a bottom surface portion 217 disposed along the bottom surface of the bottom plate 230. A folded portion 218 is formed between the upper surface portion 216 and the bottom surface portion 217. The upper surface portion 216 is disposed so as to be sandwiched between the coil 40 and the bottom plate 230. The substrate 210 is folded back at the folded portion 218 located in the cutout portion 235 so that the bottom surface portion 217 is aligned along the bottom surface of the bottom plate 230. The substrate 210 is fixed, for example, by being adhered to the bottom plate 230.

[0080] Fig. 9 is a perspective view showing the holder 250. Fig. 10 is a plan view showing the holder 250.

[0081] 9, the holder 250 is shown without illustrating the magnet 60, the yoke 270, and the weights 281 and 282, similar to Fig. 3. Also, in Fig. 10, the yoke 270 is not shown.

[0082] As shown in FIG. 9, the holding portion 255 of the holder 250 is provided with a hole 255a and holes 255b and 255c. A magnet 60 is attached to the hole 255a. The holes 255b and 255c are provided on both the left and right sides of the hole 255a so as to protrude to the left and right from the portion where the hole 255a is provided. The holes 255b and 255c each have a rectangular shape with the long side extending in the front-rear direction in a plan view. An elastic body is formed in the portion between the hole 255a and the hole 255b and in the portion between the hole 255a and the hole 255c so as to be recessed from the upper surface of the holding portion 255. This separates the holes 255a, 255b, and 255c from each other.

[0083] 10, weights 281 and 282 are attached to holes 255b and 255c, respectively. Holder 250 has a shape that is symmetrical with respect to a plane that is perpendicular to the left-right direction and passes through the center of transducer 280. That is, weights 281 and 282 have the same shape.

[0084] FIG. 11 is a development view showing the substrate 210. As shown in FIG.

[0085] In Fig. 11, the substrate 210 has an upper surface portion 216, a bottom surface portion 217, and a folded portion 218 that are developed in a planar shape. As shown in Fig. 11, the upper surface portion 216 of the substrate 210 has two pads 211 and 212, and the bottom surface portion 217 has two pads 211a and 212a. The pads 211 and 211a, and the pads 212 and 212a are connected via wiring patterns so that they are at the same potential. The winding end of the coil 40 is connected to the pads 211 and 212 on the upper surface portion 216. The pads 211a and 212a on the bottom surface portion 217 become electrodes when the vibration generator 201 is mounted on a circuit or the like.

[0086] 7, yoke 270 is a magnetic plate formed so as to cover the portion of the upper surface of vibrator 280 where magnet 60 and weights 281, 282 are provided. In this embodiment, vibrator 280, which is composed of magnet 60, yoke 270, and weights 281, 282, is integrally molded with holder 250 by insert molding, and is held by holding portion 255 of holder 250.

[0087] Fig. 12 is a plan view showing the yoke 270. Fig. 13 is a cross-sectional view taken along the line FF in Fig. 12.

[0088] As shown in Fig. 12, four protrusions 275 (275a, 275b, 275c, 275d) are provided on the yoke 270. As shown in Fig. 13, in the second embodiment, similarly to the first embodiment, each protrusion 275 has a spherical shape that is convex toward the inner surface of the upper surface of the frame 20 (upward, in the Z direction).

[0089] Each of the protrusions 275 is disposed symmetrically on the yoke 270. That is, as shown in FIG. 7, the protrusions 275a and 275b are provided at two locations symmetrical to each other with respect to a first plane (a plane parallel to the ZX plane) that passes through the center of the vibrator 280 and is perpendicular to the front-rear direction that is the motion direction of the vibrator 280. The protrusions 275a and 275b are located at two locations on a second plane that passes through the center of the vibrator 280 and is parallel to the YZ plane. On the other hand, the protrusions 275c and 275d are provided at two locations symmetrical to each other with respect to the second plane and located on the first plane. That is, in this embodiment, the protrusion 275a is provided at the rear of the left-right center of the upper surface of the vibrator 280. The protrusion 275b is provided at a position symmetrical to the protrusion 275a in the front of the left-right center of the upper surface of the vibrator 280. Protrusion 275c is provided at the front-rear center on the right side of the upper surface of transducer 280. Protrusion 275b is provided at the front-rear center on the left side of the upper surface of transducer 280, in a position symmetrical to protrusion 275c.

[0090] In the second embodiment, vibration generator 201 has a configuration basically similar to that of the first embodiment, and therefore the same effects as those of the first embodiment can be obtained. In the second embodiment, vibrator 280 is provided with weights 281, 282, which are displaced with the reciprocating motion of vibrator 280. This makes it possible to increase the amount of vibration force generated. Regardless of the size and length of arm portion 53 and the material of the elastic body, the required vibration force can be easily adjusted. Note that, as weights 281, 282, a metal having a relatively large specific gravity may be used, but is not limited thereto.

[0091] Moreover, in the second embodiment, substrate 210 is used which is an FPC. Therefore, compared with the case where a double-sided substrate is used, it is possible to reduce the vertical dimension of vibration generator 201. Also, the shape of bottom plate 230 can be simplified.

[0092] Since the bottom plate 230 is provided with the notch 235, the substrate 210 does not protrude outside the housing, and the substrate 210 can be reliably protected.

[0093] In the second embodiment, too, since protrusion 275 is provided on yoke 270, vibration generator 201 can be made thinner while maintaining a state in which vibrator 280 can move appropriately. Protrusions 275c, 275d are provided on yoke 270 at positions corresponding to the left-right direction at which weights 281, 282 are provided. Therefore, even if the structure is one in which the inertial force is large due to the provision of weights 281, 282 and vibrator 280 is likely to come into contact with frame 20, protrusions 275c, 275d come into contact with frame 20, so that vibration generator 201 can be operated reliably.

[0094] Bottom plate 230 is made of a non-magnetic material, so that, similarly to the first embodiment, even if the gap between vibrator 280 and bottom plate 230 is narrow, the operation of vibrator 280 is not impeded. Therefore, it is possible to provide a thin vibration generator 201 with a high durability, the bottom of which is covered with bottom plate 230.

[0095] [Third embodiment]

[0096] The basic configuration of the vibration generator in the third embodiment is the same as that in the first embodiment, and therefore description thereof will not be repeated here. The third embodiment differs from the first and second embodiments described above mainly in that a plurality of coils is provided.

[0097] Fig. 14 is a plan view showing vibration generator 401 according to the third embodiment, and Fig. 15 is a cross-sectional view taken along line GG in Fig. 14.

[0098] 1, holder 450 and other components that are actually hidden by the upper surface of frame 20 are partially shown in solid lines in Fig. 14. Also, in Fig. 14, the holding structure of four pillars 51 of holder 450 by frame 20 is omitted. In the third embodiment, the holding structure of holder 450 by frame 20 is the same as in the above-mentioned first embodiment.

[0099] Vibration generator 401 differs from vibration generator 1 of the first embodiment in that it has a holder 450 instead of holder 50, and vibrator 480 includes weights 481-484. Vibration generator 401 also differs from vibration generator 201 of the second embodiment in that it has two coils 440a, 440b. Vibration generator 401 is configured to generate vibrations by reciprocating vibrator 480 in the left-right direction.

[0100] As shown in FIG. 15, the substrate 410 is a flexible printed circuit board (FPC) similar to the substrate 410 of the second embodiment, and is arranged to sandwich the bottom plate 430. The bottom plate 430 is made of a non-magnetic material such as non-magnetic stainless steel. The bottom plate 430 is also configured in a manner substantially similar to the bottom plate 230 of the second embodiment. That is, the bottom plate 430 is fitted into the bottom side of the frame 20 and fixed to the frame 20. A notch 435 is provided at the right edge of the bottom plate 430. The top surface portion 416 of the substrate 410 is arranged to be sandwiched between the coils 440a, 440b and the bottom plate 430. The substrate 410 is folded back at a folding back portion 418 located at the notch 435 so that the bottom surface portion 417 is aligned with the bottom surface of the bottom plate 430. As a result, a portion of each of both sides of the bottom plate 430 is covered by the substrate 410.

[0101] Fig. 16 is a perspective view showing the holder 450 and the transducer 480. Fig. 17 is an exploded perspective view of Fig. 16.

[0102] 16, similar to holder 50, holder 450 has four pillars 51 and four arms 53. In the third embodiment, each arm 53 is formed such that the longitudinal direction is the front-rear direction. This allows vibrator 480 to vibrate in the left-right direction.

[0103] As shown in FIG. 17, holder 450 has vibrator holding section (hereinafter, sometimes referred to as holding section) 455 having a shape different from vibrator holding section 55. Holding section 455 houses magnet 460 and weights 481, 482 arranged on the left and right of magnet 460. Yoke 470 is attached to the upper surface of holding section 455. Yoke 470 is formed so as to protrude from holding section 455 in the front-rear direction. Weights 483, 484 are attached to the lower side of the part of yoke 470 protruding from holding section 455. That is, in the third embodiment, magnet 460, weights 481, 482, 483, 484, and yoke 470 constitute vibrator 480 of vibration generator 401. Each member constituting vibrator 480 is bonded to each other, fused, welded, or joined by a method such as insert molding, and is integrally constituted as a whole.

[0104] Holder 450 has a shape that is symmetrical with respect to a third plane (a plane parallel to the YZ plane) that passes through the center of transducer 480 and is perpendicular to the left-right direction, and a fourth plane (a plane parallel to the ZX plane) that passes through the center of transducer 480 and is perpendicular to the front-rear direction. Weights 481 and 482 have the same shape. Weights 483 and 484 have the same shape.

[0105] The yoke 470 has a flat plate shape as a whole, and is formed so as to cover substantially the entire upper surface of the holding portion 455. As shown in FIG. 17, holes 471a, 471b are formed near the left and right sides of the yoke 470 at positions corresponding to the weights 481, 482. The weights 481, 482 have protrusions 481a, 482a protruding upward formed on their upper surfaces. The protrusions 481a, 482b are formed so as to fit into the holes 471a, 471b, respectively. That is, the weights 481, 482 are fixed to the yoke 470 with the protrusions 481a, 482b fitted into the holes 471a, 471b, respectively.

[0106] In this embodiment, the shape of the magnet 460 is substantially the same as that of the magnet 60 in the first embodiment, but the magnetization mode of the magnet 460 is different from that of the magnet 60. That is, the magnet 460 is magnetized to a single pole. The bottom surface side of the magnet 460 is magnetized to either the S pole or the N pole.

[0107] The yoke 470 has overhangs 473a to 473d formed so as to extend in the up-down direction from the portions corresponding to the four vertices of the magnet 460. The overhang 473a is provided on the left rear portion of the vibrator 480. The overhang 473b is provided on the right rear portion of the vibrator 480. The overhang 473c is provided on the left front portion of the vibrator 480. The overhang 473d is provided on the right front portion of the vibrator 480. These overhangs 473a to 473d overhang forward or backward from the holder 455 in a plan view. The weight 483 is fixed to the yoke 470 by having the upper surfaces of both left and right sides joined to the overhangs 473a and 473b. The weight 484 is fixed to the yoke 470 by having the upper surfaces of both left and right sides joined to the overhangs 473c and 473d. A protruding portion 483a is formed on the upper surface of weight 483 so as to fit between overhanging portion 473a and overhanging portion 473b. A protruding portion 484a is formed on the upper surface of weight 484 so as to fit between overhanging portion 473c and overhanging portion 473d. Each of protruding portions 483a, 484a protrudes from the upper surfaces of weights 483, 484 by a height substantially equal to the thickness of yoke 470. This allows the weight of vibrator 480 to be increased without increasing the vertical dimension of vibrator 480 or increasing its size.

[0108] FIG. 18 is a development view showing the substrate 410.

[0109] 18, substrate 410 has top surface 416, bottom surface 417, and folded-back portion 418 laid out in a planar shape. In FIG. 18, the positions at which coils 440a and 440b are mounted are indicated by thick two-dot chain lines.

[0110] Coils 440a and 440b are arranged adjacent to each other in the left-right direction, i.e., in the direction corresponding to the motion direction of oscillator 480. Coil 440a is arranged on the left side of vibration generator 401 (lower side in FIG. 18), and coil 440b is arranged on the right side of vibration generator 401 (upper side in FIG. 18). As shown in FIG. 14, coils 440a and 440b are arranged at positions symmetrical to each other with respect to the third plane.

[0111] As shown in FIG. 18, the upper surface portion 416 of the substrate 410 is provided with pads 411a and 411b and pads 412a and 412b. The pad 411a is provided at the center of the position where the coil 440a is arranged. The pad 411b is provided at the center of the position where the coil 440b is arranged. The pads 412a and 412b are respectively arranged behind the coils 440a and 440b. The bottom surface portion 417 of the substrate 410 is provided with two pads 413a and 413b. The pads 411a and 413a are connected to each other via a wiring pattern so that they are at the same potential. The pads 411b and 413b are connected to each other via a wiring pattern so that they are at the same potential. The pads 412a and 412b are connected to each other via a wiring pattern so that they are at the same potential. The pads 412a and 412b are connected to, for example, a ground potential. A wound end of coil 440a is connected to pads 411a and 412a. A wound end of coil 440b is connected to pads 411b and 412b. Pads 413a and 413b on bottom surface 417 serve as electrodes when vibration generator 401 is mounted on a circuit or the like.

[0112] Vibration generator 401 is driven by passing currents in different directions through two coils 440a and 440b via pads 413a and 413b. That is, since magnet 460 is magnetized to a single pole, vibrator 480 moves in the left-right direction as two coils 440a and 440b are alternately excited to have polarities different from each other.

[0113] 14 and the like, yoke 470 is a single magnetic plate. In the third embodiment, yoke 470 is also provided with protrusions 475a, 475b, 475c, and 475d.

[0114] Fig. 19 is a plan view showing the yoke 470. Fig. 20 is a cross-sectional view taken along line HH in Fig. 19.

[0115] As shown in FIG. 19, four protrusions 475 (475a, 475b, 475c, 475d) are provided on yoke 470. Protrusion 475a is provided on overhanging portion 473a. Protrusion 475b is provided on overhanging portion 473b. Protrusion 475c is provided on overhanging portion 473c. Protrusion 475d is provided on overhanging portion 473d. As shown in FIG. 20, in the third embodiment as in the first embodiment, each protrusion 475 has a spherical shape that is convex toward the inner surface of the upper surface of frame 20 (upward, in the Z direction).

[0116] Each protrusion 475 is disposed symmetrically on yoke 470. That is, protrusions 475a and 475b are provided at two positions symmetrical to each other about the third plane perpendicular to the left-right direction that is the motion direction of vibrator 480. Similarly, protrusions 475c and 475d are provided at two positions symmetrical to each other about the third plane. Protrusion 475a is symmetrical to protrusion 475c, and protrusion 475b is symmetrical to protrusion 475d about the fourth plane.

[0117] In the third embodiment, vibration generator 401 basically has the same configuration as the second embodiment in that vibrator 480 includes weights 481-484 and substrate 410, which is an FPC, is used, and therefore the same effects as the second embodiment can be obtained. That is, the vertical dimension of vibration generator 401 can be reduced compared to the case where a double-sided substrate is used. In addition, since weights 481-484 are provided, the amount of vibration force generated can be increased and the required vibration force can be easily adjusted. Note that, as weights 481-484, a metal having a relatively large specific gravity may be used, but the present invention is not limited to this.

[0118] In the third embodiment, oscillator 480 is driven by a simple structure using two coils 440a, 440b. In this case, oscillator 480 can be reliably moved by either one of coils 440a, 440b. Since oscillator 480 can be moved efficiently with a high driving force, vibration generator 401 can have a higher performance.

[0119] Since protrusions 475 are provided near each of the four corners of yoke 470, vibration generator 401 can be made thinner while maintaining a state in which vibrator 480 can move appropriately. Regardless of the posture of vibrator 480, the contact area between vibrator 480 and frame 20 can be made smaller more reliably.

[0120] In the third embodiment, bottom plate 430 is also made of a non-magnetic material, and therefore the operation of vibrator 480 is not impeded even if the gap between vibrator 480 and bottom plate 430 is narrow. Therefore, it is possible to provide a thin vibration generator 401 that is highly durable.

[0121] [others]

[0122] In the second and third embodiments described above, the cutout of the bottom plate may be provided with a rounded chamfer. The chamfer may be provided, for example, at an edge portion formed by forming the cutout. This makes it difficult for the FPC board to be stressed even if it is bent at the cutout, and makes it possible to more reliably prevent damage to the board.

[0123] The frame is not limited to iron and may be made of other materials. For example, the frame may be made of resin and be formed separately from the holder. The frame may not have a top or bottom surface and may surround the holder in a plan view. The frame may be square in a plan view.

[0124] The circuit board may not be provided. The bottom plate may be disposed on only a portion of the bottom of the frame, rather than covering the entire bottom of the frame.

[0125] The number of protrusions provided on the yoke may be four or an odd number. The surface of the protrusion is not limited to a spherical shape or a curved shape. The above-mentioned effects can be obtained by forming the protrusion so that a portion of a limited area contacts the inner surface of the frame.

[0126] The number of pillars and the number of arms may each be at least two. The pillars do not have to be cylindrical, and may be polygonal. The holder does not have to be integrally molded, and may be configured by assembling multiple members.

[0127] The mounting structure of the holder to the frame is not limited to the one in which the columnar body is engaged with two claws that sandwich it, but may be any other shape of fixing part on the holder side and an engaging part formed on the frame. For example, the frame may be formed with a hole-shaped engaging part, and the holder may be mounted to the frame by fitting a protrusion on the holder side into the engaging part.

[0128] The holder is not limited to being molded in a single color, but may be molded, for example, in such a manner that the columnar body and the holding portion, and the arm portion are integrally molded by two-color molding using different materials.

[0129] The structure for attaching the vibrator to the holder, i.e., the structure for attaching the magnet and yoke to the holder, is not limited to insert molding. For example, in a process separate from the molding of the holder, the magnet and yoke joined to each other by welding or the like may be incorporated into the integrally molded holder and then glued. Also, the holder and yoke may be integrally formed, and then the magnet may be attached to the yoke portion.

[0130] The weight may be placed in the center of the magnet, etc. It is sufficient to place the weight in a part of the magnet that does not have much effect on the generation of the force that moves the vibrator. This makes it possible to configure a vibration generator that can generate a large vibration force while keeping the vibrator small.

[0131] The configuration of the holder as described above is not limited to the holder for the vibration generator as described above, but can be widely applied. That is, the holder is configured so that the movable element (the part that becomes the vibrator in the above-mentioned embodiment) provided with a magnet can be displaced via the arm part with respect to the part supported by the frame. Such a holder can be used in various other devices, such as an actuator driven by magnetism, or a device that displaces the movable element in a predetermined direction as appropriate. By configuring the holder as described above, the same effect as described above can be obtained even in devices other than such vibration generators.

[0132] The above-described embodiments should be considered as illustrative and not restrictive in all respects. The scope of the present invention is defined by the claims, not the above description, and is intended to include all modifications within the meaning and scope of the claims. [Explanation of symbols]

[0133] 1,201,401 Vibration Generator 10 Double-sided board (an example of a circuit board) 20 Frame (example of a housing) 21(21a,21b,21c,21d) Engagement part 22(22a, 22b, 22c, 22d) First claw 23(23a, 23b, 23c, 23d) Second claw 30,230,430 Bottom plate 40,440a,440b Coil 50,250,450 Holder 51 (51a, 51b, 51c, 51d) Pillar body (an example of a fixing part) 53(53a, 53b, 53c, 53d) Arm section 55,255,455 Vibrator holding part 60,460 Magnet 70,270,470 Yoke (magnetic plate) 75a,75b,275a~275d,475a~475d Projection 80,280,480 transducer 210,410 Substrate (an example of a circuit board) 281,282,481~484 Weight

Claims

1. A bottom plate, A frame, a vibrator having a magnet and a yoke; A coil and A holder for holding the vibrator; an arm connecting the transducer and the frame; Equipped with the vibrator is supported by the arm so as to be displaceable relative to the frame; the vibrator is displaceable in a direction from the bottom plate toward the frame, the arm connects the transducer and the frame via the holding portion, The arm extends in a direction intersecting a vibration direction of the vibrator, A vibration generator, wherein the yoke is in contact with a side surface of the magnet in a direction intersecting a vibration direction of the vibrator.

2. The vibration generator according to claim 1 , wherein the ears of the yoke and the sides of the magnet are in contact with each other.

3. the yoke forms part of the retainer; The yoke is located inside an outer circumferential surface of the holding portion, The vibration generator according to claim 1 , wherein the arm is connected to an outer circumferential surface of the holding portion.

4. A bottom plate; A frame, A vibrator having a magnet and a magnetic material; A coil and A holder for holding the vibrator; an elastic body connecting the vibrator and the frame; Equipped with the vibrator is supported by the elastic body so as to be displaceable relative to the frame, the vibrator is displaceable in a direction from the bottom plate toward the frame, the elastic body connects the vibrator and the frame via the holding portion, The elastic body extends in a direction intersecting a vibration direction of the vibrator, A vibration generator, wherein the magnetic body is in contact with a side surface of the magnet in a direction intersecting a vibration direction of the vibrator.

5. The vibration generator according to claim 4 , wherein ears of the magnetic body are in contact with side surfaces of the magnet.

6. The magnetic body forms a part of the holding portion, The magnetic body is located inside the outer circumferential surface of the holding portion, The vibration generator according to claim 4 , wherein the elastic body is connected to an outer circumferential surface of the holding portion.

Images