JP2018161047A - Vibration generator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vibration generator which enables reduction of manufacturing costs.SOLUTION: A vibration generator includes: a vibrator 11; a vibrator holding part which holds the vibrator 11; a case which stores the vibrator 11; and a coil which generates magnetic fields for changing at least one of a position and a posture of the vibrator 11 relative to the case. The vibrator 11 includes: a magnet 13; a yoke 14 which is disposed so as to be attracted by the magnet 13; and a magnet holding part 12 to which the magnet 13 is attached. The vibrator holding part has an attachment part 16 fixed to the case and an intermediate part 17. The intermediate part 17 connects the attachment part 16 to the magnet holding part 12 and functions as a plate spring. The attachment part 16, the intermediate part 17, and the magnet holding part 12 are integrally formed by using a metal material having elasticity.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a vibration generator, and more particularly to a vibration generator that generates vibration by causing a current to flow through a coil and moving a vibrator.

  As a vibration generator for generating vibration by moving a vibrator, various types of structures having a structure in which a vibrator including a magnet is supported by a housing via a spring portion are used. This type of vibration generator includes a coil disposed below the magnet so as to face the magnet. The vibrator moves while deforming the spring portion as the coil is energized to generate a magnetic field.

  Patent Document 1 listed below discloses a vibration generator having a structure in which a vibrating body that reciprocates in one direction by a magnetic field is supported by a leaf spring. This vibration generator has a belt-like shape arranged inside a peripheral wall surface of a non-magnetic housing so as to support a vibrating body between a vibrating body facing a coil attached to the bottom surface and the vibrating body and the peripheral wall surface. The leaf spring is provided. The leaf spring is fixed to the seating surface of the vibrating body at a connecting portion that is one end in the longitudinal direction, and is fixed to the peripheral wall surface of the case at an attachment portion that is the other end.

  A vibration generator having a similar structure is also disclosed in Patent Document 2 and Patent Document 3 below.

  Patent Document 4 listed below discloses a vibration generator having a structure in which a vibrator is supported by a leaf spring.

JP 2013-169544 A JP 2013-188353 A JP 2013-19295 A US Patent Application Publication No. 2013/0169072

  An object of the present invention is to provide a vibration generator in which an intermediate portion that connects an attachment portion and a vibrator is provided between two opposing side walls.

  In order to achieve the above object, according to one aspect of the present invention, a vibration generator includes a vibrator having a magnet, two side walls extending in the vibration direction of the vibrator and facing each other, and a case, A vibrator holding portion for holding the vibrator, and a flat plate-like coil disposed opposite to the vibrator, the vibrator holding portion being connected to the case and having one end connected to the attachment portion. The other end has an intermediate portion connected to the vibrator, and the mounting portion and the other end of the intermediate portion face each other in the direction from one side wall to the other side wall, There is a magnet between the parts.

  Preferably, the intermediate portion has a band shape along the other side wall.

  Preferably, the case includes two R-plane portions between the two side walls, and the intermediate portion includes only two curved portions along each of the two R-plane portions.

  Preferably, the vibrator includes a magnet holding portion for holding a magnet, and the other end of the intermediate portion in the direction from the coil toward the vibrator is connected to the magnet holding portion.

It is a sectional side view of the vibration generator in the 1st Embodiment of this invention. It is a perspective view explaining the attachment structure of the vibrator | oscillator of a vibration generator. It is a perspective view which shows a vibration unit. It is a disassembled perspective view of a vibration unit and a case. The development view of a sheet metal member is shown. It is a sectional side view of the vibration generator in 2nd Embodiment. It is a perspective view which shows a vibration unit. It is a perspective view which shows a sheet metal member. The development view of a sheet metal member is shown.

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

  The vibration generator has a structure in which a vibrator including a magnet is supported by the case so as to be displaceable with respect to the case (housing). A coil is disposed near the vibrator. The vibrator generates a magnetic field for changing at least one of a position and a posture with respect to the case. The vibration generator is of a so-called linear type that generates a vibration force by reciprocating a vibrator according to excitation of a coil.

  [First Embodiment]

  FIG. 1 is a side sectional view of a vibration generator according to a first embodiment of the present invention. FIG. 2 is a perspective view for explaining a mounting structure of the vibrator of the vibration generator.

  In FIG. 1, the cross section in the AA line of FIG. 2 is shown.

  The vibration generator 1 as a whole is formed in a thin, substantially rectangular parallelepiped shape with relatively small vertical dimensions. In the following description, regarding the vibration generator 1, the X-axis direction shown in FIG. 1 is the left-right direction (the X-axis positive direction when viewed from the origin is the right direction), and the Z-axis direction is the up-down direction (viewed from the origin). The positive direction on the Z axis is sometimes referred to as the upward direction). Also, the Y-axis direction shown in FIG. 2 (the direction perpendicular to the XZ plane in FIG. 1) may be referred to as the front-rear direction (the direction that is positive on the Y-axis when viewed from the origin) may be referred to as the rear direction.

  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 front, rear, left, and right side surfaces and an upper surface are constituted by a case 2 and a bottom surface is covered with a circuit board 6.

  [Overall structure of vibration generator 1]

  As shown in FIG. 1, the vibration generator 1 roughly has a structure in which a vibrator 11 and a coil 5 for reciprocating the vibrator 11 are housed in a housing 2. A circuit board 6 is provided below the housing 2. The vibration generator 1 generates a vibration force when the vibrator 11 reciprocates according to the excitation of the coil 5.

  In the present embodiment, the vibrator 11 is supported by the vibrator holding portion 15 so as to be displaceable with respect to the housing 2. The vibrator 11 and the vibrator holding portion 15 constitute one vibration unit 10, and the vibration unit 10 is held by the housing 2.

  The circuit board 6 is a printed wiring board provided with patterns on both sides, for example. On the pattern of the circuit board 6, a terminal 6a to which the winding end of the coil 5 is connected is provided. The vibration generator 1 is driven by energizing the coil 5 through a pattern provided on the circuit board 6.

  The housing 2 is divided into a case 3 and a plate 4. The plate 4 is formed in a rectangular plate shape so as to cover substantially the entire upper surface of the circuit board 6. The plate 4 and the circuit board 6 are fixed to each other through, for example, an adhesive sheet or an adhesive. In other words, the circuit board 6 is connected along the plate 4. The plate 4 is provided with an opening 4a so that the terminal 6a is exposed upward. A side wall 4b is provided at the edge of the plate 4 so as to be bent approximately 90 degrees upward from the plane portion and to form an L-shaped cross section together with a portion on the circuit board 6. The plate 4 covers the vibrator 11 and the coil 5 together with the case 3.

  In the present embodiment, the case 3 and the plate 4 are configured using a nonmagnetic material. The case 3 and the plate 4 are made of a nonmagnetic metal material such as nonmagnetic stainless steel. The case 3 and the plate 4 are not limited to those using a metal material, and may be made of a resin, for example.

  The coil 5 is a flat air core coil as a whole formed by winding a conducting wire, for example. That is, the coil 5 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 5 may be formed by slicing a wound metal foil, or may be a laminate of sheet coils. Further, the shape of the coil 5 may be elliptical or circular in a plan view, or may be a polygonal shape such as a square shape.

  The coil 5 is disposed on the upper surface of the plate 4 so that the winding axis direction is the vertical direction. The coil 5 is disposed in the center of the vibration generator 1 so as to face the vibrator 11 in plan view. The coil 5 and the plate 4 are insulated. The two winding ends of the coil 5 are wired from the inside of the coil 5 to the upper surface side of the circuit board 6 through the opening 4a and connected to the terminal 6a.

  The case 3 as a whole has a rectangular parallelepiped shape with an open bottom. The case 3 is configured using, for example, a nonmagnetic material. The corners of the case 3 (parts between the side walls 3c) are connected to each other with the R-plane portion interposed therebetween in plan view. In the upper surface 3a of the case 3, a hole 3b is partially formed in the vicinity of the side wall 3c.

  As shown in FIG. 1, the case 3 is disposed from above the circuit board 6 so as to cover the upper surface of the circuit board 6. The case 3 is fixed to the plate 4 by bonding or welding the side walls 3c to the side walls 4b. That is, the plate 4 is attached to the case 3. Each side wall 3 c is disposed so as to contact the inner side surface of the side wall 4 b of the plate 4. The case 3 may be fixed to the plate 4 by being fitted to the side wall 4b or using other methods.

  Thus, since the vibration generator 1 has the structure enclosed by the box-shaped housing 2 comprised by the case 3 and the plate 4, the rigidity of the vibration generator 1 itself becomes high. 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.

  [Structure of vibration unit 10]

  FIG. 3 is a perspective view showing the vibration unit 10. FIG. 4 is an exploded perspective view of the vibration unit 10 and the case 3.

  3 and 4 show a state where the vibration unit 10 is viewed from below, that is, the side of the vibration unit 10 facing the coil 5.

  As shown in FIG. 3, the vibration unit 10 is divided into a vibrator 11 and a vibrator holding portion 15 that supports the vibrator 11. A part of the vibrator holding portion 15 is fixed to the housing 2 as will be described later, whereby the vibrator 11 is supported so as to be displaceable with respect to the housing 2.

  As shown in FIG. 4, the vibration unit 10 is configured by combining a sheet metal member 10 a, a magnet 13, and a yoke 14. Among these, the vibrator 11 is composed of the magnet holding portion 12, the magnet 13, and the yoke 14 which are a part of the sheet metal member 10 a. The vibrator holding portion 15 is configured by a portion excluding the magnet holding portion 12 in the sheet metal member 10a.

  The vibrator holding part 15 has an attachment part 16 and an intermediate part 17. The attachment portion 16 is sandwiched between the case 3 and the plate 4 and is fixed to the case 3. The intermediate portion 17 connects the attachment portion 16 and the magnet holding portion 12. The intermediate portion 17 has a shape that functions as a leaf spring, and the vibrator 11 is supported by the intermediate portion 17 so as to be displaceable with respect to the attachment portion 16.

  Hereinafter, the structure of the vibration unit 10 and the structure for attaching the vibration unit 10 to the case 3 will be described more specifically.

  As shown in FIG. 4, holes 3 b are formed at two locations in the vicinity of the two side walls 3 c on the upper surface 3 a of the case 3. In the present embodiment, the attachment portion 16 includes the vicinity of the front side wall 3ca and the vicinity of the right side wall 3cb among the four side walls 3c (the front side wall 3ca, the right side wall 3cb, the rear side wall 3cc, and the left side wall 3cd) of the case 3. And is provided. Each hole 3b is a through-hole, for example, but may be a bottomed recess recessed from the inner surface of the upper surface 3a.

  FIG. 5 shows a development view of the sheet metal member 10a.

  In FIG. 5, illustration of dowel processing or the like applied to the magnet holding portion 12 is omitted as will be described later.

  As shown in FIG. 5, the attachment portion 16, the intermediate portion 17, and the magnet holding portion 12 are integrally formed using the same sheet metal member 10 a. The magnet holding part 12 is connected to the tip of the intermediate part 17 via a bent part 17a. The sheet metal member 10a is a nonmagnetic, elastic metal plate. Specifically, as the sheet metal member 10a, for example, a thin plate material such as austenitic spring stainless steel or phosphor bronze is used. A flat sheet metal member 10a as shown in FIG. 5 is bent by sheet metal processing to form a sheet metal member 10a having a shape as shown in FIG.

  The sheet metal member 10 a has a shape in which one end of the intermediate portion 17 is connected to the mounting portion 16 and the other end is connected to the magnet holding portion 12. The intermediate portion 17 has a band shape in which the longitudinal direction is the longitudinal direction so as to follow the inner surface of the case 3 in a state where the vibration unit 10 is housed in the housing 2. Specifically, the intermediate portion 17 is formed along the inner surface of the side wall 3c from the right side wall 3cb through the rear side wall 3cc side to the left side wall 3cd. The intermediate portion 17 is formed such that the vertical direction is the width direction of the band, and the vertical direction is the plate thickness direction. Thereby, the intermediate part 17 has flexibility which curves in the direction perpendicular | vertical with respect to the up-down direction mainly.

  The attachment portion 16 is formed in a strip shape whose vertical width is substantially equal to the vertical dimension of the inner surface of the case 3. That is, the vertical dimension of the attachment portion 16 is larger than that of the intermediate portion 17. The attachment portion 16 has a band shape in which the front-rear direction or the left-right direction is the longitudinal direction so as to follow the inner surface of the case 3 in a state where the vibration unit 10 is housed in the housing 2. Specifically, the attachment portion 16 is formed by being bent halfway along the two surfaces of the inner surface of the front side wall 3ca and the inner surface of the right side wall 3cb. The attachment portion 16 is connected to the intermediate portion 17 at an end portion on the right side wall 3cb side.

  The attachment portion 16 and the intermediate portion 17 are bent so that the vibration unit 10 is bent along the R-shaped portion (corner portion) between the side walls 3c of the case 3 in a state where the vibration unit 10 is housed in the housing 2. Is formed.

  The magnet holding part 12 has a plate shape substantially parallel to the horizontal plane. The magnet holding part 12 is formed by being bent 90 degrees at a bent part 17 a at the tip of the intermediate part 17.

  During sheet metal processing of the sheet metal member 10a, a plurality of dowels (projections) 12a and openings 12b are formed in the magnet holding portion 12 by the sheet metal processing.

  The dowel 12a is formed by doweling processing. In the present embodiment, five dowels 12 a are formed so as to protrude downward from the bottom surface of the magnet holding portion 12. When the magnet 13 is placed on the magnet holding portion 12, the dowel 12 a is disposed at a position close to the side portion of the magnet 13 and positions the magnet 13.

  The openings 12b are formed at two locations in the magnet holding portion 12 in the region where the magnet 13 is disposed. The opening 12b is formed so that a plurality of dowels 14a (protrusions) formed in the yoke 14 are fitted as will be described later.

  The yoke 14 is a rectangular plate formed from a soft magnetic metal material such as iron, for example, in plan view. Two dowels 14a are formed on the bottom surface of the yoke 14 so as to protrude downward by doweling. The yoke 14 is attached to the magnet holding part 12 so that each of the two dowels 14a fits in each of the two openings 12b. Thereby, the yoke 14 is attached in the state positioned with respect to the magnet holding part 12.

  In addition, since the dowel 12a is formed on the bottom surface of the yoke 14, the magnet holding portion 12 is provided by providing protrusions so as to fit into some of the recesses formed on the upper surface side of the magnet holding portion 12. Alternatively, the yoke 14 may be positioned with respect to the yoke 14. Such a protrusion may be provided in place of the dowel 14a fitted in the opening 12b. In this case, the opening 12b may not be provided. Further, such a protruding portion may be provided in addition to the dowel 14a fitted into the opening 12b.

  The magnet 13 has a thin rectangular parallelepiped shape. For example, a neodymium magnet is used as the magnet 13, but the magnet 13 is not limited to this. For example, the magnet 13 is magnetized in two poles so that the N pole and the S pole are separated in the front-rear direction on the bottom side facing the coil 5. The magnet 13 is placed on the magnet holding unit 12 in a state of being positioned by the five dowels 12a.

  The magnet 13 attracts the yoke 14 by the magnetic attraction force of the magnet 13. Therefore, the magnet 13 and the yoke 14 are fixed to the magnet holding part 12 so as to firmly hold the magnet holding part 12. The magnet 13 is fixed to the magnet holding part 12 in a state of being positioned by the dowel 12a. In the state where the magnet 13 is fixed to the magnet holding portion 12 in this way, the dowel 12a also functions as a stopper that restricts the movement (movement) of the magnet 13.

  In addition, the magnet 13 and the yoke 14 may be attached to the magnet holding part 12 not only by the above magnetic attraction force but also by a method such as adhesion.

  Here, for example, two positioning projections 16 a are formed at two positions on the lower end portion of the attachment portion 16. Each positioning protrusion 16a is formed at a position corresponding to the hole 3b of the case 3 so as to be fitted into the hole 3b. Each positioning projection 16a is fitted in each of the holes 3b, so that the vibration unit 10 is mounted in a positioned state with respect to the case 3. When the housing 3 is formed by fitting the case 3 and the plate 4, the end portion (lower end portion) of the mounting portion 16 opposite to the side on which the positioning projection 16 a is formed is located upward by the bottom surface of the plate 4. It will be in the state pressed. In this way, the vibrator holding unit 15 is sandwiched between the case 3 and the plate 4.

  In addition, although the positioning protrusion 16a is formed only at the upper end portion of the attachment portion 16, it may be formed only at the lower end portion of the attachment portion 16, or may be formed at both ends of the upper end portion and the lower end portion. Also good. For example, when the positioning protrusions 16 a are formed on the upper end portion and the lower end portion of the attachment portion 16, a hole similar to the hole portion 3 b of the case 3 is formed on the plate 4, and the upper end portion of the attachment portion 16 is formed. With the positioning protrusion 16 a fitted in the hole 3 b of the case 3 and the positioning protrusion on the lower end of the mounting portion 16 fitted in the hole of the plate 4, the vibrator holding portion 15 is connected to the case 3 and the plate 4. It is sufficient to be sandwiched between.

  The sheet metal member 10a is not limited to a nonmagnetic metal material. The sheet metal member 10a may be configured using a soft magnetic metal material instead of a nonmagnetic metal material. For example, spring steel or SUS420J2CSP, which is martensitic spring stainless steel, can be used. When the soft magnetic metal material is used in this way, the magnet holding portion 12 also functions as a yoke. Further, when the magnet holding portion is configured by using a soft magnetic metal material so as to function as a yoke in this way, it is not necessary to provide a separate yoke from the magnet holding portion 12.

  [Operation of vibration generator 1]

  In the vibration generator 1, the coil 5 generates a magnetic field for reciprocating the vibrator 11 with respect to the case 3. That is, when a current flows through the coil 5, the coil 5 is excited and a magnetic field is generated in the vertical direction. When a magnetic field is generated, the magnet 13 is affected by the magnetic field and a repulsive / attractive force is generated. Depending on the direction of the magnetic field and the arrangement of the magnetic poles of the magnet 13, a force for displacing the vibrator 11 forward or backward acts. Therefore, the vibrator 11 is displaced in one of the front and rear directions (the direction indicated by the arrow D in FIG. 2) while bending the intermediate portion 17. Therefore, when an alternating current is passed through the coil 5, the vibrator 11 performs a reciprocating linear motion in the front-rear direction with respect to the case 3 in plan view according to the alternating current. Thereby, the vibration generator 1 generates a vibration force.

  Note that the shape and arrangement of coils, magnets, holders, and the like may be set so that a vibration force is generated by a change in the posture of the vibrator 11 according to the generation of the magnetic field.

  As described above, in the first embodiment, the magnet holding portion 12, the intermediate portion 17, and the mounting portion 16 are integrally configured by the sheet metal member 10a that is one member. Since the vibration unit 10 is configured by performing sheet metal processing on a sheet metal member 10a which is a metal plate and attaching the magnet 13 and the yoke 14, it can be manufactured at low cost.

  Further, two positioning projections 16 a are formed on the attachment portion 16, and the vibrator holding portion 15 can be easily positioned with respect to the case 3 by fitting the positioning projections 16 a into the holes 3 b of the case 3. Then, the lower end of the side opposite to the side on which the positioning protrusions 16 a are formed is pressed by the plate 4 so that the vibrator holding unit 15 is sandwiched between the case 3 and the plate 4. The housing 2 can be formed by fitting. Therefore, it is not necessary to use a method such as welding when fixing the vibrator holding portion 15 to the case 3, and the vibrator holding portion 15 can be easily and reliably fixed to the case 3. The manufacturing cost can be reduced.

  [Second Embodiment]

  Since the basic configuration of vibration generator 1 in the second embodiment is the same as that in the first embodiment, description thereof will not be repeated here. The second embodiment is different from the first embodiment in that the yoke is formed using the same magnetic material as the vibrator holding portion.

  FIG. 6 is a side sectional view of the vibration generator 1 according to the second embodiment.

  In FIG. 6, a cross-sectional view in the same cross section as FIG. 1 is shown.

  As shown in FIG. 6, the second embodiment is different from the second embodiment except that a vibration unit 210 having a configuration different from that of the vibration unit 10 of the first embodiment is used. A similarly configured member is used. The vibration unit 210 includes a vibrator 211 and a vibrator holding unit 15 configured in the same manner as that of the vibration unit 10 of the first embodiment.

  FIG. 7 is a perspective view showing the vibration unit 210. FIG. 8 is a perspective view showing the sheet metal member 210a.

  The vibration unit 210 includes the magnet 13 and a sheet metal member 210a. As shown in FIG. 7, the vibration unit 210 has a configuration in which the vibrator 211 having the magnet 13 is held by the vibrator holding unit 15.

  As shown in FIG. 8, the sheet metal member 210 a includes the vibrator holding unit 15, the magnet holding unit 212, and the yoke 214. The vibrator holding unit 15, the magnet holding unit 212, and the yoke 214 are integrally configured using the same member. In the present embodiment, the sheet metal member 210a is a metal material such as SUS420J2CSP, which is a metal material having a soft magnetic material, such as spring steel or stainless steel for martensite springs. The magnet 13 is attracted to the magnet holding part 212 and the yoke 214 by a magnetic attractive force while being positioned by the dowel 212a, and is fixed to the magnet holding part 212.

  FIG. 9 is a development view of the sheet metal member 210a.

  In FIG. 9, projections and holes formed in the magnet holding part 212 are not shown.

  As shown in FIG. 9, in the sheet metal member 210a, the portion that becomes the magnet holding portion 212 is secured larger than the portion that becomes the magnet holding portion 12 of the first embodiment. The other parts of the sheet metal member 210a are configured in substantially the same manner as the sheet metal member 10a of the first embodiment described above.

  Of the sheet metal member 210 a, the large portion as described above is a magnet holding portion 212 and a yoke 214 connected to the magnet holding portion 212. That is, leaving only the portion that becomes the magnet holding portion 212, the other portion is folded back toward the opposite side (upper surface side) of the magnet holding portion 212 to the side on which the magnet 13 is arranged (upper surface side) and overlapped with the magnet holding portion 212. Processing is performed. Thus, the part folded back on the upper surface side of the magnet holding part 212 becomes the yoke 214, and a structure is obtained in which the yoke 214 is arranged above the magnet holding part 212 so as to be in contact with the magnet holding part 212. Thus, the yoke 214 is configured integrally with the magnet holding part 212 and the vibrator holding part 15.

  In the second embodiment, the surface area of the portion that becomes the yoke 214 is larger than that of the magnet holding portion 212. Therefore, the yoke 214 is configured such that a plurality of layers of metal plates are folded so that the other part of the sheet metal member 210a except the part that becomes the magnet holding part 212 is folded in a so-called zigzag manner. In the second embodiment, as shown in FIG. 6, for example, a configuration in which a total of three layers of metal plates are folded together by combining the magnet holding portion 212 and the yoke 214 is obtained. In addition, what is necessary is just to set suitably the direction and aspect of a spell fold. Instead of zigzag folding, the yoke may be formed by folding a plurality of metal plates by a method of winding repeatedly in the same direction. Alternatively, a configuration may be used in which the metal plate is folded once and the magnet holding portion 212 and the yoke 214 are combined and a total of two layers of metal plates overlap.

  Here, as shown in FIG. 8, five dowels 212 a projecting downward are formed on the lower surface of the magnet holding portion 212. As in the first embodiment, the dowel 212a functions as a stopper that positions the magnet 13 and restricts the movement (movement) of the magnet 13 when the vibration generator 1 is driven.

  Further, a hole 212b is formed in a portion of the magnet holding portion 212 other than the range where the magnet 13 is placed. Further, a dowel 212c formed so as to be fitted into the hole 212b when bent into the yoke 214 is provided at a portion to be the yoke 214. The holes 212b and the dowels 212c are formed by performing sheet metal processing (press processing, doweling processing, etc.) at the time of sheet metal processing, like the dowels 212a. When the yoke 214 is formed by bending the sheet metal member 210a, sheet metal processing is performed so that the dowel 212c fits into the hole 212b, and a structure in which the yoke 214 is joined to the magnet holding portion 212 is obtained.

  The magnet 13 is attracted to the magnet holding part 212 and the yoke 214 by a magnetic attractive force while being positioned by the dowel 212a, and is fixed to the magnet holding part 212. Thus, the vibrator 211 is constituted by the magnet holding portion 212 and the yoke 214 and the magnet 13 which are integrated. The magnet holding part 212 is sandwiched between the yoke 214 and the magnet 13.

  Also in the second embodiment, the vibration generator 1 operates in the same manner as in the first embodiment. Since the vibration unit 210 is configured by, for example, bending the sheet metal member 210a by sheet metal processing and attracting the magnet 13 to the sheet metal member 210a, the number of components is small and can be easily manufactured. Therefore, the manufacturing cost of the vibration generator 1 can be further reduced.

  [Others]

  The magnet and the yoke may not be arranged so as to sandwich a part of the magnet holding portion. For example, the magnet holder, the yoke that contacts the magnet holder, and the magnet that contacts the yoke may be arranged so as to overlap in this order from above. In this case, it is desirable that the magnet holding portion is a soft magnetic material and is configured to be attracted to the yoke based on the magnetism of the magnet. Such a structure can also be employed when the yoke and the magnet are configured to be separate (not integrated) parts.

  The above-described structure can also be employed when the yoke and the magnet holding part are both configured to be an integral part by bending one metal plate. For example, the yoke may be arranged on the surface of the magnet holding portion opposite to the side where the magnet is arranged so as to be connected to the magnet holding portion.

  The circuit board may not be provided. The plate may be disposed only on a part of the bottom of the case without covering the entire surface of the bottom of the case.

  The specific shape of the vibrator and the specific shape of the vibrator holding portion are not limited to those described above.

  The vibrator may have a weight arranged to increase the mass of the vibrator.

  A coil is attached to the main board of equipment that uses vibration, and a vibration generator can be driven by attaching a case with a vibration unit to the main board on which the coil is mounted. May be. In other words, the vibration generator may be configured using a coil mounted on a substrate of another device.

The vibration generator is not limited to a small one as exemplified above. Large vibration generators having the same basic configuration may be configured, and even in this case, the same effects as described above can be obtained.
In the vibration generating device described in Patent Document 1 described above, the leaf springs are formed in an elongated strip shape, and one is arranged on each side of the vibrating body. One end of the leaf spring in the longitudinal direction is fixed to a part of the side surface of the vibrating body, and the other end is fixed to the peripheral wall surface of the case. Here, the vibration generator using the above structure has the following problems. That is, in order to manufacture such a vibration generator, an operation of attaching the leaf spring to the vibrating body and an operation of attaching the leaf spring to the case are required. In order to attach the leaf spring to the vibrating body or the case, it is generally necessary to use a fixing method such as laser welding. However, if such work is performed by laser welding, for example, the manufacturing cost of the vibration generator is reduced. Becomes higher. In particular, for parts used in consumer products such as mobile terminals, there is a strong demand for reduction in manufacturing costs. However, if such a structure is adopted, it may not be possible to meet such demands. is there. Regarding such a problem, none of Patent Documents 2 to 4 discloses an effective solution. In the said embodiment, the vibration generator which can reduce manufacturing cost can be provided.

  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.

DESCRIPTION OF SYMBOLS 1 Vibration generator 2 Housing 3 Case 3b Hole 4 Plate 5 Coil 6 Circuit board 10,210 Vibration unit 11, 211 Vibrator 12,212
12a, 14a, 212a, 212c Dowel 13 Magnet 14, 214 Yoke 15 Transducer holding part 16 Mounting part 16a Positioning protrusion 17 Intermediate part

An object of this invention is to provide a vibration generator provided with a magnet holding part .

According to one aspect of the present invention to achieve the above object, the vibration generator includes a coil,
A magnet facing the coil, a magnet holding part on which the magnet is placed, and a housing that supports the coil and the magnet holding part. The magnet holding part includes a plurality of protrusions, and the plurality of protrusions The magnet is fixed to the magnet holder.

Preferably, the magnet is positioned by a plurality of protrusions .

Preferably, the magnet holding part is made of a magnetic material .

Preferably, the plurality of protrusions are stoppers against movement of the magnet .
Preferably, the magnet has a rectangular parallelepiped shape.
Preferably, a metal plate is provided, the metal plate includes an attachment portion and a magnet holding portion, and the attachment portion is fitted in the housing.
Preferably, a positioning protrusion is formed on the attachment portion, and the positioning protrusion is fitted in the housing.

Claims (4)

A vibrator having a magnet;
A case having two side walls extending in the vibration direction of the vibrator and facing each other;
A vibrator holding unit for holding the vibrator with respect to the case;
A flat coil disposed opposite to the vibrator,
The vibrator holding unit is
A mounting portion fixed to the case;
One end is connected to the mounting portion, and the other end has an intermediate portion connected to the vibrator,
In the direction from the one side wall toward the other side wall, the mounting portion and the other end of the intermediate portion are opposed to each other,
A vibration generator in which the magnet is located between the mounting portion and the intermediate portion facing each other.   The vibration generator according to claim 1, wherein the intermediate portion has a band shape along the other side wall. The case includes two R-plane portions between the two side walls,
The vibration generator according to claim 1 or 2, wherein the intermediate portion includes only two curved portions along each of the two R-plane portions. The vibrator includes a magnet holding portion that holds the magnet,
4. The vibration generator according to claim 1, wherein an end of the other end of the intermediate portion in a direction from the coil toward the vibrator is connected to the magnet holding portion. 5.

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