JP2014107996A - Vibration generator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vibration generator that can be easily assembled with high accuracy.SOLUTION: The vibration generator comprises: an oscillation part 60 having a magnet; at least two frames 55a and 55b that support the oscillation part 60 via arm parts 80a to 80d; and an outer case 102 fitted to the at least two frames 55a and 55b. The at least two frames 55a and 55b, the arm parts 80a to 80d, and the oscillation part 60 are integrally molded. Preferably, the at least two frames 55a and 55b are attached while being pulled by the outer case 102.

Description

  The present invention relates to a vibration generator, and more particularly to a vibration generator that reciprocates to generate vibration.

  As a vibration generator that generates vibration by moving a vibrator, for example, there is a vibrator that reciprocates a vibrator including a magnet using a magnetic force.

  The following Patent Document 1 discloses a linear motor having a structure in which a magnet serving as a movable portion is disposed inside a frame portion that is a fixed portion, and a plate spring is provided between the magnet and the frame portion to hold the magnet. Yes. In this linear motor, the magnet moves relative to the frame portion by exciting the coil portions arranged so as to sandwich the upper and lower sides of the magnet.

JP 2010-36131 A

  By the way, since the vibration generator as described in the above-mentioned Patent Document 1 is for energizing the magnet by the leaf spring and moving the magnet, it ensures a relatively wide space for deformation of the leaf spring. is necessary. Therefore, there is a limit to increasing the size of the vibrator with respect to the vibration generator, and it is difficult to increase the amount of vibration. In other words, in order to increase the vibration amount, it is necessary to enlarge the vibration generator itself.

  Moreover, the vibration generator as described in patent document 1 is comprised combining a magnet, a leaf | plate spring, and a frame part which are mutually different members. Therefore, the number of steps required for assembling the vibration generator is large, and the manufacturing process of the vibration generator becomes relatively complicated. Moreover, since it becomes relatively difficult to ensure assembly accuracy, the variation (individual difference) in the performance of the vibration generator increases.

  The present invention has been made to solve such problems, and an object thereof is to provide a vibration generator that can be assembled easily and accurately.

  In order to achieve the above object, according to one aspect of the present invention, a vibration generator includes a swing part including a magnet, at least two frames that support the swing part via an arm part, and the at least two frames. The at least two frames, the arm portion, and the swinging portion are integrally formed with each other.

  Preferably, the at least two frames are attached to the outer case while being pulled.

  Preferably, the vibration generator further includes a coil disposed so as to face the swinging portion, and a recess is formed in a portion of the swinging portion facing the coil.

  According to these inventions, a vibration generator that can be easily and accurately assembled can be provided.

It is a top view which shows the vibration generator in one of the embodiment of this invention. It is the sectional view on the AA line of FIG. It is a perspective view which shows the structure of a vibration generator. It is a perspective view which shows the site | part in which the groove part is formed among weights. It is a perspective view which shows an arm part. It is a top view which shows the vibration generator which concerns on the modified example of this Embodiment. It is a perspective view which shows an arm part. It is a perspective view which shows the site | part in which the groove part is formed among the weights of the vibration generator which concerns on another modification of this Embodiment. It is a disassembled perspective view which shows the structure of the vibration generator in other embodiment. It is a figure which shows the cross-section of the vibration generator in other embodiment.

  Hereinafter, a vibration generator in one embodiment of the present invention will be described.

  The vibration generator has a structure in which a portion of the vibrator that holds the magnet is supported so as to be displaceable with respect to the other portions of the vibration generator. A coil is arranged near the magnet, away from the magnet. The coil generates a magnetic field for changing at least one of the position and posture of the magnet. The vibration generator generates a vibration force by deforming the vibrator according to the excitation of the coil and causing the magnet to reciprocate. That is, the vibration generator is of a so-called linear type.

[First Embodiment]
FIG. 1 is a plan view showing a vibration generator in one embodiment of the present invention. 2 is a cross-sectional view taken along line AA in FIG. FIG. 3 is a perspective view showing the structure of the vibration generator.

  In FIG. 1, the vibrator 50 and the like originally hidden by the top plate 20 are partially displayed with a solid line so that the component layout of the vibration generator 1 can be easily understood. In FIG. 1, the illustration of a flexible printed circuit board (FPC; hereinafter simply referred to as a substrate) 10 is omitted except for a part thereof.

  In the following description, with respect to the vibration generator 1, the X-axis direction of the coordinates shown in FIG. The direction that is positive on the Y axis as viewed is sometimes referred to as the backward direction). Also, the Z-axis direction in FIG. 2 (the direction perpendicular to the XY plane in FIG. 1) may be referred to as the vertical direction (the positive direction on the Z-axis when viewed from the origin is the upward direction).

[Overall structure of vibration generator 1]
As shown in FIG. 3, the vibration generator 1 roughly includes a substrate 10, a top plate 20, a bottom plate 30, a coil 40, and a vibrator 50. As shown in FIG. 1, the vibrator 50 includes a frame 55, a swinging portion 60, four arm portions (an example of an elastic member) 80 (80a, 80b, 80c, 80d) in the present embodiment. have.

  As will be described later, in the vibration generator 1, the swinging unit 60 is displaced in the left-right direction mainly with respect to other parts of the vibration generator 1 including the vibrator 50 such as the frame 55, and swings. Generate vibration. That is, in the present embodiment, the swinging direction of the swinging unit 60 is the left-right direction.

  The vibration generator 1 as a whole is formed in a thin, substantially rectangular parallelepiped shape with relatively small vertical dimensions. The vibration generator 1 is, for example, a small one whose outer dimensions in the left-right direction and the front-rear direction are only about 10 millimeters to 20 millimeters. The vibration generator 1 has a box-shaped outer shape in which an upper surface and a lower surface of a vibrator 50 having a frame 55 surrounding a side periphery are covered with a top plate 20 and a bottom plate 30.

  As shown in FIG. 3, the vibrator 50 has a structure in which the swinging part 60 is disposed inside the frame 55. The frame 55 and the swinging part 60 are connected via four arm parts 80.

  In the present embodiment, the frame 55 is formed in a rectangular ring shape by bending, for example, one or a plurality of strip-shaped metal plates. In other words, the frame 55 has a square shape and is formed in a hollow shape, and the swinging portion 60 is disposed therein. Note that the frame 55 does not have to be completely annular. For example, it may be partially interrupted, or may be formed in a ring shape as a whole so that the ends of one or more metal plates partially overlap each other.

  The swing part 60 is formed in a substantially rectangular shape in plan view. The swing part 60 has a plate shape that is parallel to a horizontal plane (XY plane in FIG. 1). The oscillating portion 60 is formed in a substantially rectangular shape in which each side is parallel to the front-rear direction or the left-right direction, except for a square, in plan view.

  The oscillating unit 60 is disposed at the center of the vibrator 50 in a plan view, that is, at the center of the vibration generator 1. As shown in FIG. 2, the oscillating portion 60 is disposed so as to face the coil 40 in substantially parallel to the coil 40.

  The top plate 20 is flat and has a rectangular shape that is substantially the same shape as the upper edge of the frame 55. The top plate 20 is disposed so as to be fitted into the upper end portion of the frame 55. The bottom plate 30 is flat and has a rectangular shape that is substantially the same shape as the lower edge of the frame 55. The top plate 20 is disposed so as to be fitted into the lower end portion of the frame 55. The top plate 20 and the bottom plate 30 may be bonded to the frame 55 or welded.

  In the present embodiment, a notch 35 is formed in a part of the short side of the bottom plate 30. By forming the notch 35, the inside and the outside of the vibration generator 1 are in communication.

  As shown in FIG. 2, the substrate 10 includes a first portion 10 a on which an electrode connected to the coil 40 is formed and an electrode on which a line for driving the vibration generator 1 is connected. 2 part 10b is mutually connected via the bending part 10c. The bent portion 10 c is formed to have a width that passes through the cutout portion 35. The substrate 10 is disposed such that the bent portion 10c is positioned in the notch 35 and the bottom plate 30 is sandwiched between the first portion 10a and the second portion 10b. By using such a flexible printed circuit board 10, the vertical dimension of the vibration generator 1 can be reduced as compared with the case of using a double-sided circuit board. Further, since the bottom plate 30 having a simple shape can be used, the manufacturing cost of the vibration generator 1 can be reduced. Since the notch 35 is provided in the bottom plate 30, the substrate 10 does not protrude outside the housing, and the substrate 10 can be reliably protected.

  The coil 40 is an air core coil that is an elliptical and flat plate as a whole, for example, formed by winding a conductive wire. That is, the coil 40 is a thin coil in which the dimension in the winding axis direction is smaller than the dimension in the direction orthogonal to the winding axis direction. The coil 40 may be formed by slicing a wound metal foil, or may be a laminate of sheet coils. The coil 40 may have a circular shape or a polygonal shape such as a quadrangular shape in plan view.

  The coil 40 is disposed on the first portion 10a of the substrate 10 so that the winding axis direction is the vertical direction. As shown in FIG. 1, the coil 40 is disposed in the center of the vibration generator 1 so as to face the swinging portion 60 as will be described later in plan view. The coil 40 is connected to an electrode (not shown) formed on the first portion 10 a of the substrate 10. The coil 40 can be energized by energizing an electrode (not shown) formed on the second portion 10 b of the substrate 10 exposed on the outer surface of the vibration generator 1.

  As described above, the swinging portion 60 and the coil 40 are covered with the top plate 20, the bottom plate 30, and the frame 55. As a result, foreign matter such as dust can be prevented from entering the vibration generator 1, and the vibration generator 1 can be kept operable. Further, since the vibration generator 1 is surrounded by the top plate 20, the bottom plate 30, and the frame 55 in a box shape, the rigidity of the vibration generator 1 itself is increased. Therefore, the vibration generator 1 can reliably generate vibration. In addition, the vibration generator 1 is easy to handle during attachment to an external device or the like.

  In the present embodiment, the frame 55 and the top plate 20 are made of a soft magnetic material such as iron, for example. Since the vibration generator 1 has a structure surrounded by the frame 55 and the top plate 20, the vibration generator 1 is hardly affected by the surrounding magnetic field. Further, the magnetic flux in the vibration generator 1 is hardly leaked to the outside, and it is prevented that the external device or circuit is affected.

  On the other hand, the bottom plate 30 is configured using a nonmagnetic material. The bottom plate 30 is made of a nonmagnetic metal material such as nonmagnetic stainless steel. The bottom plate 30 is not limited to one using a metal material, and may be made of a resin, for example. Further, the frame 55 and the top plate 20 are not limited to being made of a soft magnetic material, and may be configured using, for example, a resin or a nonmagnetic metal material.

[Detailed structure of vibrator 50]
As shown in FIG. 2, the swinging unit 60 includes a magnet 61, a back yoke 63, and a weight 65. The magnet 61 is a permanent magnet and is disposed at the approximate center of the swinging unit 60. The back yoke 63 is a soft magnetic material such as iron, and is disposed on the magnet 61. The weight 65 is disposed around the magnet 61 and the back yoke 63 so as to hold the magnet 61 and the back yoke 63. The weight 65 is made of, for example, a metal having a relatively large specific gravity.

  In the present embodiment, as the magnet 61, two (magnets 61a and 61b) arranged separately on the left and right are provided. The magnet 61a and the magnet 61b are configured to have different polarities. That is, the direction of the magnetic pole with respect to the coil 40 of the magnet 61a is opposite to that of the magnet 61b. As the magnet 61, one magnetized so that the directions of the magnetic poles with respect to the coil 40 are different from each other on the left and right may be provided. For example, the magnet 61 may be magnetized in two poles so that the N pole and the S pole are separated in the left-right direction at the bottom side facing the coil 40. Three or more magnets 61 may be arranged.

  As shown in FIG. 1, each arm portion 80 includes a weight joint portion 81 joined to the outer peripheral surface of the weight 65 in the swing portion 60 and a frame joint portion 83 joined to the inner side surface of the frame 55. And a beam portion 85 connecting the weight joint portion 81 and the frame joint portion 83, and a gate portion 87 formed on the weight joint portion 81 side. Each arm portion 80 is integrally formed of, for example, an elastic resin.

  The beam portion 85 is a portion of each arm portion 80 that bends mainly when the swinging portion 60 is displaced with respect to the frame 55. Each arm portion 80 is arranged such that the longitudinal direction of each beam portion 85 is substantially parallel to the Y-axis direction. That is, the beam portion 85 is formed such that the direction perpendicular to the swinging direction of the swinging portion 60 is the longitudinal direction.

  In the present embodiment, a cross section perpendicular to the longitudinal direction of the beam portion 85 (that is, a cross section parallel to the ZX plane; hereinafter, simply referred to as a cross section of the beam portion 85) is a rectangle. The short side of the cross section is substantially parallel to the swinging direction of the swinging unit 60.

  The four arm portions 80 are connected to four corners (right rear, right front, left front, and left rear) of the swing portion 60 so that the swing portion 60 is supported in a balanced manner with respect to the frame 55. The arm portion 80a is disposed on the right side of the weight 65. The arm portion 80 b is disposed on the right front side of the weight 65. The arm portion 80 c is disposed on the left front side of the weight 65. The arm portion 80d is disposed on the left side of the weight 65.

  The oscillating unit 60 is symmetrical with respect to each of a first plane passing through the center of the oscillating unit 60 and parallel to the YZ plane and a second plane passing through the center of the oscillating unit 60 and parallel to the ZX plane in plan view. It has a shape. Further, the four arm portions 80 are arranged in symmetrical positions at symmetrical positions with respect to each of the first plane and the second plane. That is, the vibrator 50 is configured symmetrically with respect to each of the first plane and the second plane.

  Here, as shown in FIG. 1, each portion of the weight 65 where the arm portion 80 is disposed (joint portion between the weight 65 and the arm portion 80) has a groove portion 67 (67 a, 67 b, 67 c, 67d) is formed.

  FIG. 4 is a perspective view showing a portion of the weight 65 where the groove 67 is formed.

  Referring to FIG. 4, groove 67 is formed such that the longitudinal direction is a direction that is not parallel to the swinging direction of swinging unit 60 (here, mainly the X-axis direction). That is, the groove portion 67 is formed such that the Z-axis direction substantially perpendicular to the swinging direction of the swinging portion 60 is the longitudinal direction.

  While the groove portion 67 is formed in this way, the arm portion 80 is formed with a gate portion 87 that protrudes from the weight joint portion 81 so as to bite into the groove portion 67. That is, the joint surface between the arm portion 80 and the weight 65 is undulated in a direction perpendicular to the swinging direction of the swinging portion 60.

[Description on Manufacturing Method of Vibrator 50]
In the present embodiment, the vibrator 50 is configured by integrally forming a frame 55, a swinging portion 60 (a magnet 61, a back yoke 63, and a weight 65), and four arm portions 80 by insert molding. . The vibrator 50 is manufactured as follows.

  First, the back yoke 63 and the magnet 61 are attached to the weight 65. Thereby, the rocking | swiveling part 60 is comprised. In addition, a frame 55 that is bent into a rectangular shape is prepared. The back yoke 63 and the magnet 61 may be attached to each other by, for example, spot welding or adhesion.

  Next, the frame 55 and the swinging portion 60 are set in the mold for the vibrator 50.

  Then, a resin constituting the arm portion 80 is poured into the mold. The vibrator 50 is obtained by removing the mold.

  Note that the back yoke 63 and the magnet 61 may be attached to the weight 65 portion after being integrally formed.

  As a resin (resin used for integral molding) used for the arm portion 80 or the like, for example, a silicon resin or the like is used. In addition, heat-resistant fluorine rubber or the like may be used. By forming the vibrator 50 using such rubber, the heat resistance of the vibration generator 1 can be improved. The elastic body is not limited to this, and various types can be used.

  Here, when the groove portion 67 is formed in the weight 65 as described above, when the vibrator 50 is integrally formed, resin is injected using the groove portion 67 as a gate. Therefore, molding can be performed more easily.

[Description of Operation of Vibration Generator 1]
In the vibration generator 1, the swinging part 60 can be displaced with respect to the frame 55 while deforming the beam part 85 of the arm part 80. The coil 40 generates a magnetic field for causing the swinging unit 60 to reciprocate with respect to the frame 55. When the coil 40 is excited, the swinging portion 60 is displaced with respect to the frame 55 accordingly. The vibration generator 1 generates vibration by repeating the reciprocating motion of the swinging unit 60.

  More specifically, when a current flows through the coil 40, the coil 40 is excited and a magnetic field is generated in the vertical direction. When a magnetic field is generated, the magnet 61 is affected by the magnetic field, and a repulsive / attractive force is generated. A force for displacing leftward or rightward is applied to the oscillating portion 60 according to the direction of the magnetic field and the arrangement of the magnetic poles of the magnet 61. For this reason, the swinging portion 60 is displaced in any of the left and right directions while bending each beam portion 85. When an alternating current is passed through the coil 40, the swinging unit 60 performs a reciprocating linear motion in the left-right direction with respect to the frame 55 in a plan view according to the alternating current. Thereby, the vibration generator 1 generates a vibration force.

  When the alternating current value decreases and the magnetic field becomes weaker or disappears, the oscillating unit 60 tries to return to the center of the vibration generator 1 in plan view by the restoring force of the arm unit 80. At this time, since the arm part 80 is an elastic body, the energy consumed by the arm part 80 is relatively large. Therefore, the vibration is quickly damped.

  In the present embodiment, since the bottom plate 30 is configured using a nonmagnetic material, no magnetic attractive force is generated by the magnet 61 between the swinging portion 60 and the bottom plate 30. The oscillating unit 60 is smoothly and efficiently displaced according to the magnetic field generated by the coil 40. Therefore, the vibration generator 1 can be made thinner and can be operated appropriately.

[Description of shape of beam portion 85]
Here, in the present embodiment, the shape of the beam portion 85 of each arm portion 80 is determined so that the vibrator 50 operates efficiently as follows.

  FIG. 5 is a perspective view showing the arm unit 80.

  As shown in FIG. 5, in the present embodiment, the vertical dimension (the dimension of the long side of the cross section of the beam part 85) h of the beam part 85 is the horizontal dimension (the beam part 85 of the beam part 85). It is larger than the dimension (t of the short side of the cross section) t. For example, the vertical dimension h is about twice as large as the horizontal dimension t.

  By setting the shape of the beam portion 85 in this manner, the behavior of the swinging portion 60 in the Z-axis direction can be relatively suppressed, while a large amount of vibration can be obtained. Therefore, the force generated when the coil 40 is excited can be efficiently transmitted in the main swinging direction of the swinging unit 60. The optimum dimensional ratio between the vertical dimension h and the horizontal dimension t of the beam portion 85 can be determined as appropriate by performing a simulation while changing these parameters.

[Effects of the embodiment]
As described above, in the present embodiment, the vibrator 50 is configured by integrally forming the frame 55, the swinging part 60, and the arm part 80. Therefore, the vibrator 50 can be easily assembled with high assembly accuracy. Since it does not take time to attach the swinging part 60 to the frame 55 and the number of parts can be reduced, the manufacturing cost of the vibration generator 1 can be reduced. Moreover, since the rocking | swiveling part 60 and the flame | frame 55 are integrally formed, the attaching part of the rocking | swiveling part 60 and the flame | frame 55 does not become fragile. Therefore, the reliability with respect to the impact of the vibration generator 1 can be improved. Since another member such as a screw is not required to attach the swinging unit 60 to the frame 55, the vibration generator 1 can be reduced in size, thickness, and weight.

  In the present embodiment, since the swinging portion 60 and the frame 55 are configured as separate members, the number of parts is reduced. Further, the material of the frame 55 can be appropriately selected while having a simple structure that can be easily assembled. Therefore, for example, the frame 55 can be configured to play its role without providing a member that functions as a magnetic shield.

  The vibrator 50 is integrally formed including the frame 55. Therefore, sufficient vibration force can be obtained while the size of the arm portion 80 is relatively small. Compared to the overall size of the vibrator 50, that is, compared to the overall size of the vibration generator 1, the size of the oscillating portion 60 can be made relatively large. Therefore, even in the small vibration generator 1, a relatively large amount of vibration can be obtained. In particular, in each arm portion 80, the longitudinal direction of the beam portion 85 is a direction orthogonal to the swing direction, and the beam portion 85 is efficiently deformed in the swing direction. Therefore, this effect can be obtained more effectively.

  The arm portion 80 is disposed so as to be symmetric with respect to each of the first plane and the second plane. Therefore, the rocking | swiveling part 60 is supported with sufficient balance and the vibration generator 1 can generate | occur | produce a vibration more effectively.

  The joint portion between the arm portion 80 and the weight 65 is undulated by the provision of the groove portion 67. In particular, the groove 67 is formed such that a direction different from the swinging direction of the swinging unit 60 is the longitudinal direction. Even if the groove portion 67 is not provided, a sufficient bonding strength between the arm portion 80 and the swinging portion 60 can be obtained. However, by providing the groove portion 67 in this manner, the arm portion 80 swings in the swinging direction. Troubles such as displacement of the moving part 60 can be prevented more reliably, and the durability of the vibration generator 1 can be further improved.

[Description of variant]
The vibrator may have a slit in the beam portion of the arm portion.

  FIG. 6 is a plan view showing a vibration generator according to a variation of the present embodiment.

  In FIG. 6, the vibration generator 101 is shown in the same manner as in FIG. The vibration generator 101 is different from the above-described vibration generator 1 in that it includes an arm part 180 (180a, 180b, 180c, 180d) having a slightly different shape from the arm part 80. In addition, in FIG. 6, illustration of the groove part 67 is abbreviate | omitted. Except for the difference between the arm unit 80 and the arm unit 180, the vibration generator 101 has substantially the same configuration as the vibration generator 1.

  FIG. 7 is a perspective view showing the arm unit 180.

  As shown in FIG. 7, the arm portion 180 has a beam portion 185 that is wider in the X-axis direction than the beam portion 85 of the arm portion 80. The beam portion 185 has a slit 186 formed along the longitudinal direction of the beam portion 185 at the center in the X-axis direction. The slit 186 is formed so as to penetrate from the upper surface to the lower surface of the beam portion 185. The slit 186 is formed in the entire area from the weight joint portion 81 to the frame joint portion 83. That is, the beam portion 185 is divided into two beams having a narrow width in the X-axis direction because the slit 186 is formed. The width dimension of the beam portion 185 in the X-axis direction, the width dimension of the slit 186, and the like may be set as appropriate so that characteristics such as an amplitude amount when the vibrator 50 vibrates are desired.

  Since the slit 186 is provided in the beam portion 185 as described above, the stress generated in the beam portion 185 when the swinging portion 60 is displaced is the case where the beam portion 85 of the type in which the slit 186 is not provided is used. Compared to Therefore, the lifetime of the beam portion 185 can be made relatively long, and the durability of the vibration generator 101 can be further improved.

  The groove part may be provided only in a part of the joint part between the weight and the arm part.

  FIG. 8 is a perspective view showing a portion where a groove is formed in a weight of a vibration generator according to another modification of the present embodiment.

  As shown in FIG. 8, the weight 65 may have a groove portion 267 having a shape different from that of the groove portion 67 in the above embodiment. In this case, since the groove portion 267 is used as a gate when the arm portion 80 is formed, the arm portion 80 is formed with a protruding portion 287 having a shape corresponding to the groove portion 267.

  The groove part 267 has, for example, a shape carved downward from the upper surface of the weight 65 by a predetermined distance. The lower end portion of the groove portion 267 does not reach the lower surface of the weight 65. That is, the groove portion 267 is provided only in a part of the joint portion between the weight 65 and the arm portion 80.

  Even if the groove 267 having such a shape is provided, the same effects as those of the above-described embodiment can be obtained. That is, the undulation is generated on the joint surface between the weight 65 and the arm portion 80, and the arm portion 80 is less likely to be displaced with respect to the weight 65 when the swinging portion 60 swings. Moreover, since the groove part 267 is used as a gate when the arm part 80 is formed, the arm part 80 can be easily formed.

[Others]
The groove part of the weight and the protruding part of the arm part may not be provided. Even if the gate position is not provided on the weight side, the bonding strength is sufficiently ensured.

  A plurality of coils may be provided. For example, it can be provided so as to be lined up on the left and right along the swing direction of the swing portion. In this case, a magnet that is magnetized so that the pole on the surface facing the coil is a single pole may be used.

  The shape of the frame and the shape of the vibrator are not limited to a rectangular shape in plan view. For example, it can be formed in various shapes such as an ellipse and a polygon.

  The coil may be attached to a main board or the like of a device that uses vibration, and the oscillator may be attached to the main board on which the coil is mounted so that the swinging unit can be driven. . In other words, the vibration generator may be configured using a coil mounted on a substrate of another device.

  The top plate may not necessarily be attached to the vibration generator. The top plate is useful for preventing dust from entering the vibrator, but the top plate may not be used, for example, when the vibration generator is stored in a narrow space.

  Instead of the flexible printed board, a printed wiring board (such as a double-sided board) may be used. In this case, instead of both the bottom plate and the flexible printed board, a printed wiring board is used, and the bottom plate may not be used.

[Other embodiments]
FIG. 9 is an exploded perspective view showing a structure of a vibration generator (linear vibration motor) according to another embodiment, and FIG. 10 is a view showing a cross-sectional structure of the vibration generator.

  Referring to the drawing, the vibration generator includes a top plate 20, a vibrator 50, an outer case 102 having a U-shaped cross section, and a bottom plate 30.

  In the vibrator 50 of the vibration generator, the frames (side surfaces) 55a and 55b, the weight 65, and the arm portions 80a to 80d are connected by being integrally formed. At the time of molding, the size of the vibrator 50 in the direction of arrow A (or B) is formed slightly smaller than the size of the outer case 102 in the direction of arrow A (or B). When the vibrator 50 is assembled in the outer case 102, the arm portions 80a to 80d are extended by pulling the frame 55a in the arrow A direction and the frame 55b in the arrow B direction. As a result, the size of the vibrator 50 in the direction of arrow A (or B) is larger than the size of the outer case 102 in the direction of arrow A (or B) while being pulled. In this state, the frames 55a and 55b are hooked on the outer case 102.

  When hooking, the convex portions 107 a to 107 d formed on the frames 55 a and 55 b of the vibrator 50 are engaged with the concave portions 109 a to 109 d formed on the outer case 102. Further, each of the convex portions 113a to 113d (113b and 113c are not shown) formed on the frames 55a and 55b of the vibrator 50 is engaged with each of the concave portions 111a to 111d formed on the outer case 102. . Thereby, positioning with respect to vibrator 50 and outer case 102 is performed correctly.

  As shown in FIG. 10, the magnet 61 with the back yoke 63 bonded is provided between the weights 65 to form the swinging portion 60. The arm portions 80a to 80d are made of a stretchable material such as resin or rubber.

  The top plate 20 is attached to a structure in which the vibrator 50 and the outer case 102 are combined. At this time, the convex portion 20a of the top plate 20 and the concave portion 105a of the outer case 102 are fitted, the convex portion 20b of the top plate 20 and the concave portion 109b of the vibrator 50 are fitted, and the convex portion of the top plate 20 20c and the concave portion 105c of the outer case 102 are fitted, and the convex portion 20d of the top plate 20 and the concave portion 109d of the vibrator 50 are fitted. As a result, the positioning of the top plate 20 and the structure in which the vibrator 50 and the outer case 102 are combined is accurately performed.

  A hole 103 for projecting the coil 40 attached to the bottom plate 30 is provided at the bottom of the outer case 102. By fitting the coil 40 into the hole 103, a vibration generator as shown in the cross-sectional view of FIG. 10 can be formed.

  Further, as shown in FIG. 10, when the bottom surface of the weight 65 is compared with the bottom surface of the magnet 61, the bottom surface of the magnet 61 is positioned upward. Thereby, the hollow 61a which avoids the coil 40 which protrudes upwards from the bottom is formed. The weight 65 can be made as large (heavy) as possible so that the coil 40 is positioned in the recess 61a or the recess 61a and the coil 40 face each other, and a larger amount of vibration can be obtained. it can.

  A hole 103 is formed in the central portion of the outer case 102 so that the coil 40 can be fitted, and the wiring board (bottom plate 30) on which the coil 40 is mounted is attached from the bottom. The top plate 20 is mounted on the surface opposite to the wiring board. The top plate 20 may not be provided in the vibration generator. That is, the top plate 20 is necessary for preventing dust from mixing, but may not be necessary in a vibration generator mounted in a narrow space.

  The vibration generator configured as described above has a structure in which the vibration generator 50 is hooked and stopped on the outer case 102 by pulling and extending the arm portions (made of rubber or resin) 80a to 80d. With such a structure, vibration can be generated quickly, and the response of vibration generation is enhanced.

  Further, by integrally molding the frame, the arm portion, and the swinging portion, the number of manufacturing steps can be reduced, and the assembly accuracy can be increased.

  The above embodiment should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

1,101 Vibration generator 10 Flexible printed circuit board 20 Top plate 30 Bottom plate 40 Coil 50 Vibrator 55 Frame 60 Oscillating part 61 Magnet 63 Back yoke 65 Weight 67,267 Groove part (gate)
80, 180 arm part (an example of an elastic member)
85,185 Beam 102 Outer case 109a, 109b Frame 186 Slit

Claims (3)

A swing part including a magnet;
At least two frames for supporting the swinging part via an arm part;
An outer case that fits into the at least two frames;
The vibration generator, wherein the at least two frames, the arm part, and the swing part are integrally formed with each other.   The vibration generator according to claim 1, wherein the at least two frames are attached to the outer case while being pulled. A coil disposed to face the swinging portion;
The vibration generator according to claim 1, wherein a recess is formed in a portion of the swinging portion facing the coil.

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