JP2005324162A - Vibration actuator - Google Patents

Abstract

To provide a small flat vibration actuator capable of generating a sufficient amount of vibration by a mover having a simple structure and excellent durability and efficiently swinging a limited space in a housing body.
By providing a drive coil 6 on the outer peripheral side surface of a housing body 7 formed in a substantially cylindrical shape, a large portion of the space inside the housing body 7 can be made an area occupied by the mover 5. Even in such a small space, a large amount of vibration can be obtained by using the weight body 3 having a high specific gravity as a weight. In addition, since the mover 5 and the coil 6 are separated by separating the side wall of the housing body 7, there is no mutual physical contact and interference, and there is no problem of coil disconnection, greatly improving reliability as well as durability. be able to.
[Selection] Figure 3

Description

  The present invention relates to a small vibration device as a vibration alarm device, and more particularly to a vibration electronic device mounted on an information terminal device such as a portable electronic device typified by a mobile phone and a portable liquid crystal TV game machine.

  At present, in a portable information terminal represented by a mobile phone, a vibration calling function for notifying a user of an incoming call by bodily sensation vibration is indispensable to society. Has been developed.

  As the vibration generating device, for example, an applied device that generates bodily sensation vibration and sound using a cylindrical and flat type small vibration motor that rotates an eccentric weight, a speaker-driven multifunction device (MFD), or the like is well known. However, with the recent trend toward miniaturization of the portable information terminal main body, the space that can be taken by the vibration generator inside the device has become limited year by year.

  Under such constraints, the vibration generator has a novel structure that can generate a vibration amount that can reliably recognize an incoming call while reducing power consumption and reducing power consumption. Development of vibration devices is desired.

In order to solve the above problem, for example, in the vibration generator shown in Patent Document 1, an inner yoke and a coil centered on a shaft are used as a stator, and an outer yoke disposed on the outer periphery thereof is used as a mover. A vibration generator has been developed (see, for example, Patent Document 1).
JP 2003-181374 A

  However, in the vibration generator represented by the above-mentioned Patent Document 1, the outer yoke, which is a mover, is formed in an annular shape with a disc cut out, so that the mover is sufficient to generate vibration. It is difficult to obtain weight, and the oscillation efficiency, that is, the vibration amount is not always sufficient. Further, in the general vibration motor as described above, since the structure is complicated and the vibration is generated by high-speed rotation, there remains a problem in the reliability of the sliding portion. In addition, since the multi-function device (MFD) adopts the basic structure of a speaker, the amplitude of the magnetic circuit and the amplitude of the diaphragm overlap each other, and the thickness of the limited thickness dimension There was a problem that sufficient vibration force could not be obtained within the range.

  Accordingly, the present invention provides a small-diameter flat-type vibration actuator that has a simple structure, is excellent in durability, and can generate a vibration amount that can be clearly recognized by the user by making maximum use of a limited space. With the goal.

In order to solve the above problem, the invention according to claim 1 is:
A mover having a plate-like or annular permanent magnet, a housing main body that houses the mover, a thin plate-like elastic body that supports the mover and the housing main body connected to each other, and drives the mover A permanent magnet is oriented such that a magnetic flux is generated in a radial direction at a radially outer peripheral portion of the permanent magnet, and the coil is an outer peripheral side surface of the housing body made of a nonmagnetic material. It is characterized by being provided in a ring shape along.

  According to the first aspect of the present invention, the magnetic flux of the permanent magnet is oriented in the radial direction, and vibration is generated by providing the driving coil on the outer peripheral side of the housing main body, which is a position where the magnetic flux passes substantially vertically. There is no physical contact between the mover and the coil, or interference due to the drive, and the mover integrated with the permanent magnet constituting the magnetic circuit section is formed by the magnetic flux generated from the coil side across the housing body. By receiving the force of magnetic flux, it is possible to reciprocate in the thrust direction using the elastic plate surface supported in the housing body as a reference surface, thereby generating a large vibration force.

The invention according to claim 2 is the invention according to claim 1,
The coil is provided at a position where the outer peripheral side surface of the housing body is wound in a strip shape and passes substantially perpendicular to the magnetic flux generated from the permanent magnet.

  According to the second aspect of the present invention, the radial magnetic flux generated from the permanent magnet provided inside the housing body passes through the annular coil surface wound in the belt shape substantially vertically. As a result, the mover having a permanent magnet receives a force in the axial direction by the drive magnetic field generated from the coil, and can reciprocate in the thrust direction with the elastic body plane as a reference plane, thereby generating a large vibration force. It becomes.

The invention according to claim 3 is the invention according to claim 1 or 2,
The permanent magnet is movably provided within a range in which a magnetic field of magnetic flux substantially perpendicular to a coil provided on an outer peripheral side surface of the housing main body is located on the outer periphery of the mover. It is said.

  According to the third aspect of the present invention, a magnetic flux perpendicular to the coil provided on the outer peripheral side of the housing main body is generated from the permanent magnet provided in the housing main body. Is moved perpendicularly to both the direction of the current flowing in the coil and the direction of the magnetic flux generated from the permanent magnet with respect to the mover configured to have the permanent magnet and the weight body. Force (Fleming's left-hand rule) is applied.

The invention according to claim 4 is the invention according to any one of claims 1 to 3,
The permanent magnet is a united structure in which the same pole surfaces of two axially oriented permanent magnets are arranged opposite to each other, and the direction of the magnetic flux at the opposite position of the same pole surface is the same as the radial direction of the permanent magnet. It is characterized by being oriented in a direction.

According to the fourth aspect of the present invention, since the permanent magnet has a structure in which the same poles of two axially oriented permanent magnets are opposed to each other, magnetic fluxes generated from the opposite polarities of the permanent magnets act on each other. Accordingly, the magnetic field in the space in the vicinity of the opposed homopolar surface is oriented in a radial direction (radial direction) in the radial direction of the annular permanent magnet. To do. Therefore, the direction of the magnetic flux is the radial direction of the permanent magnet.

  The invention according to claim 5 is the invention according to any one of claims 1 to 3, wherein the permanent magnet is at least one radial orientation type permanent magnet.

  According to the fifth aspect of the present invention, the characteristics of a radial orientation type magnet can be obtained with only one permanent magnet, and when the current is passed through the coil, the permanent magnet and the weight body are included. A greater vibration force is applied to the vibration direction of the mover.

The invention according to claim 6 is the invention according to any one of claims 1 to 5,
A pole piece for guiding magnetic flux is provided on a part of the mover.

  According to the sixth aspect of the present invention, by providing a pole piece in a part of the mover, the coil provided on the outer peripheral side of the housing body from the permanent magnet side provided in the housing body is provided. On the other hand, since the magnetic flux intensively passes through the pole piece and the magnetic flux density in the radial direction is partially improved, a stronger magnetic flux acts on the coil. For this reason, when an electric current is passed through the coil, a larger vibration force is applied to the vibration direction of the mover configured to have the permanent magnet and the weight body.

The invention according to claim 7 is the invention according to any one of claims 1 to 4,
The movable element has two axially oriented permanent magnets formed in a plate shape or an annular shape and one pole piece, and the pole piece is formed of two axially oriented permanent magnets formed in a plate shape or an annular shape. It is characterized by being provided between the opposite poles of the magnet.

  According to the seventh aspect of the present invention, the permanent magnet of the mover has a structure in which the same poles of two permanent magnets formed in a plate shape or an annular shape are opposed to each other, and between the opposed magnetic poles. By providing the pole piece, the direction of the magnetic flux is concentrated on the outer periphery of the pole piece in the radial direction of the plate-like or annular permanent magnet, and the magnetic flux density in the radial direction is partially improved. A stronger magnetic flux is applied. For this reason, when an electric current is passed through the coil, a larger vibration force is applied to the vibration direction of the mover configured to have the permanent magnet and the weight body.

The invention according to claim 8 is the invention according to any one of claims 1 to 3,
The mover has one axially oriented permanent magnet and two pole pieces formed in a plate shape or annular shape having substantially the same diameter, and the two pole pieces have a thickness of the axially oriented permanent magnet. It is characterized by being provided at both upper and lower ends in the direction.

  According to the eighth aspect of the present invention, the permanent magnet of the mover has a structure including one axially oriented permanent magnet formed in a plate shape or an annular shape and two pole pieces arranged on both magnetic poles. The magnetic flux concentrates on the outer periphery of the pole pieces of the two magnetic poles of the permanent magnet formed in the shape of a plate or ring, and the magnetic flux density in the radial direction is partially improved, so that a stronger magnetic flux is applied to the coil. The For this reason, when an electric current is passed through the coil, a larger vibration force is applied to the vibration direction of the mover configured to have the permanent magnet and the weight body.

The invention according to claim 9 is the invention according to any one of claims 1 to 8,
The mover has a substantially disc-shaped weight body at the center thereof, and has an outer diameter close to the inner wall of the housing body with respect to a radial direction substantially perpendicular to a vibration direction of the mover. It is said.

  According to the ninth aspect of the present invention, the permanent magnet on the mover side having a substantially disc-shaped heavy body having an outer diameter close to the inner wall of the housing main body, and the outer peripheral side of the housing main body are provided. Is generated when a current flows through the coil provided on the outer peripheral side of the housing body and the magnetic flux generated from the permanent magnet provided on the mover. A stronger magnetic force can be received by the magnetic field, and thus a larger vibration force can be obtained.

The invention according to claim 10 is the invention according to any one of claims 1 to 9,
The weight body is characterized by being formed of a weight of a non-magnetic material whose main component is high specific polymerization gold such as tungsten.

  According to the invention described in claim 10, in the invention described in any one of claims 1 to 9, it is formed of a high specific gravity metal body containing a nonmagnetic material mainly composed of tungsten. The weight, which is the weight body, receives a magnetic force generated by a magnetic flux generated from the permanent magnet on the mover side and a magnetic field generated when a current is passed through a coil provided on the outer peripheral side of the housing body, A large vibration force can be obtained.

The invention according to claim 11 is the invention according to any one of claims 1 to 9,
The weight body is formed of a weight of a general non-magnetic material having a large specific gravity such as brass.

  According to the eleventh aspect of the present invention, in the invention according to any one of the first to ninth aspects, the weight formed by a metal body of a nonmagnetic material having a large specific gravity such as brass. The body is vibrated by receiving a force generated by the action of a magnetic flux generated from the permanent magnet and a magnetic field generated when a current is passed through a coil provided on the outer peripheral side of the main body.

  According to the first aspect of the present invention, the coil that vibrates the mover in which the permanent magnet and the weight body are integrated is provided on the outer peripheral side of the housing main body, so that most of the inner region of the housing main body is obtained. A region for driving the mover can be used, and a sufficient amplitude can be obtained even in a small space in a small-diameter housing, and a larger amount of vibration can be generated. In addition, since the mover and the coil are separated from each other through the side wall of the housing body, the contact and interference between the mover and the coil, which are caused by the deviation of the vibration direction due to a slight difference in weight distribution or the like, are reliably prevented. be able to. As a result, the structure can be simplified and the durability and reliability of the apparatus can be improved. Furthermore, when attaching the coil in the manufacturing process, there is no need to worry about interference between the mover and the coil, and the work time for positioning and the like can be greatly shortened, and the production efficiency can be improved.

  According to the second aspect of the present invention, the same effect as that of the first aspect of the invention can be obtained, and in particular, a movable element in which a permanent magnet and a weight body are integrated is vibrated. By winding a coil for generating a magnetic field to be wound in a strip shape and providing the magnetic flux generated from the permanent magnet provided inside the housing main body at a substantially right angle, the magnetic efficiency can be increased. it can. Therefore, a more powerful vibration force can be obtained efficiently.

  According to the invention described in claim 3, the same effect as that of the invention described in claim 1 or 2 can be obtained, and in particular, a permanent magnet provided inside the housing body can be moved. A permanent magnet and a weight body are provided by driving the mover within a range in which a magnetic field of magnetic flux substantially perpendicular to the coil provided on the outer peripheral side of the housing body is generated. The maximum amplitude and vibration can be made to act on the vibration direction of the entire mover configured as described above.

  According to the invention described in claim 4, the same effect as in the invention described in any one of claims 1 to 3 can be obtained. In particular, the permanent magnet is plate-shaped or annular. In order to force the magnetic flux generated from the two poles of the two axially oriented permanent magnets to be bent in the radial direction, the radial direction of the permanent magnets is More powerful magnetic flux can be generated. Thereby, when an electric current is passed through the coil, a stronger magnetic force can be obtained with respect to the vibration direction of the mover, and at the same time a large vibration force can be obtained. In addition, it is technically difficult to obtain a permanent magnet that is magnetized in a radial direction in a small permanent magnet that is applied to the present invention. However, the axial formed in a plate shape or an annular shape as in the present invention. By forming the oriented permanent magnets with the same polarity facing each other and forming them as an integral permanent magnet, it is possible to obtain an equivalent of a small permanent magnet magnetized in the radial direction.

  According to the invention described in claim 5, the same effect as in the invention described in any one of claims 1 to 3 can be obtained, and in particular, the permanent magnet has one radial orientation type. It consists of a permanent magnet. Thereby, the characteristic as a radial orientation type permanent magnet most suitable for this invention is acquired.

  According to the invention described in claim 6, in addition to obtaining the same effect as the invention described in claims 1-5, in particular, a pole piece for guiding magnetic flux to a part of the mover is provided. As a result, the magnetic flux acting on the coil from the permanent magnet side can be made stronger, so that when a current is passed through the coil, the vibration of the mover configured to have a permanent magnet and a weight body Driving in the direction can be maximized.

  According to the invention described in claim 7, the same effect as in any one of claims 1 to 4 can be obtained, and in particular, two permanent bodies are attached to the weight body which is a part of the mover. By providing a magnet and one pole piece, a magnetic field generated from the two permanent magnets provided inside the housing main body at a substantially right angle to a coil provided on the outer peripheral side of the housing main body is It can be made to pass through in one pole piece, and a stronger magnetic flux can be made to act on the coil. For this reason, when an electric current is passed through the coil, a stronger driving force can be obtained with respect to the vibration direction of the mover configured to include a weight body having the two permanent magnets and one pole piece. Vibration force can be obtained.

  According to the invention described in claim 8, the same effect as that of the invention described in any one of claims 1 to 3 can be obtained, and in particular, the weight body has an annular shape with the same diameter. The magnetic flux generated from the annularly formed permanent magnets intensively passes through the pole piece and the outer periphery of the main body. A stronger magnetic flux can be applied to the two coils provided on the side. For this reason, when a current is passed through two coils, the movable element is arranged in a vibration direction having a weight body having one permanent magnet and two pole pieces formed in an annular shape with the same diameter. On the other hand, a stronger driving force and vibration force can be obtained.

  According to the invention of claim 9, the same effect as that of any one of claims 1 to 8 can be obtained. Since it has a substantially disc-shaped weight body having an outer diameter close to the inner wall, the maximum weight of the mover can be obtained in a limited space.

  Further, according to the invention described in claim 10, in addition to obtaining the same effect as that of the invention described in any one of claims 1 to 9, in particular, the weight body is made of a high material such as tungsten. Since it is formed by a weight of a metal body containing a non-magnetic material mainly composed of specific polymerized gold, the maximum weight of the mover can be obtained in a limited small space.

  According to the eleventh aspect of the present invention, the same effects as those of the first aspect of the present invention can be obtained. In particular, the weight body has a specific gravity such as brass. Since it is formed by the weight of a metal body of a large general non-magnetic material, the maximum weight of the mover can be obtained using a relatively inexpensive material in a limited space.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

<First Embodiment>
As shown in FIGS. 1 to 4, the vibration actuator 1 according to this embodiment includes a substantially cylindrical housing body 7 having one end closed by a substrate 10 and a recess 7 a at the center of the other end. ing. In terms of dimensions, the vibration actuator will be described as a small flat-shaped vibration actuator having an outer diameter of 15 mm to 10 mm or less and a thickness of 5 mm to 4 mm.

  As shown in FIG. 1, a substantially disc-shaped elastic body 4 having an outer diameter close to the inner diameter side frame of the housing body 7 is formed on the annular surface corresponding to the bottom surface of the recess 7a inside the housing body 7. The inner diameter hole 8 of the recess 7a is fixed concentrically.

  On the outer peripheral edge on the lower surface side of the elastic body 4, two axially oriented permanent magnets 2a and 2b having an outer diameter substantially equal to that of the elastic body 4 are arranged on the same polar surface (for example, As shown in FIGS. 3 and 4, the N pole and the N pole) are bonded and fixed to face each other, and the upper surface of the permanent magnet 2a is supported by bonding and fixing to the outer peripheral edge on the lower surface side of the elastic body 4. ing. In addition to the adhesive fixing, there is a method of opposingly arranging using a mechanical fixing structure.

  Further, below the permanent magnet 2b, a small-diameter step is provided so that the elastic body 4 and the permanent magnets 2a and 2b have substantially the same outer diameter, and a part thereof is fitted into the permanent magnets 2a and 2b. The weight body 3 is configured to be fitted to a depth slightly exceeding the facing surface.

  Further, the weight body 3 and the permanent magnets 2a and 2b are laminated together in the direction of the circular axis to form a mover 5. The mover 5 as a whole is elasticated via the elastic body 4. By being fixed concentrically to the bottom surface of the recess 7a of the housing body 7 at the center of the body 4, the movable element 5 can reciprocate greatly in the thickness direction in the housing body 7. Is attached.

  Further, on the outer peripheral side of the housing main body 7, a conductor wound along the outer peripheral edge of the housing main body 7 at a circumferentially opposed position corresponding to the arrangement surface of the permanent magnets 2a, 2b on the movable element 5 side. Is provided as a winding coil 6 for generating a drive magnetic field for moving the mover 5.

  The open end of the housing body 7 forms a casing body of the vibration actuator by holding and fixing the substrate 10 provided with the terminals 10a with the fixing portion 7b, and between the substrate 10 and the coil 6. 2 is connected to the land R on the bottom side of the substrate 10 so that the terminal 10a can be energized. By the way, the terminal 10a portion of the substrate 10 is provided with through-holes so that both the front and back lands R can be energized.

  Here, since the movable element 5 vibrates (amplifies) in the vertical direction during operation with the stationary state of the elastic body 4 as a reference plane in the housing main body 7, as shown in FIG. The clearance 60A between the inner wall of the upper surface of 7 and the upper surface of the elastic body 4, the clearance 60B between the lower surface of the elastic body 4 and the upper surface of the weight body 3, and the clearance 60C between the lower surface of the weight body 3 and the upper surface of the substrate 10 are both It is desirable to ensure the same height at the maximum.

  The housing body 7 is preferably a non-magnetic material such as stainless steel, aluminum, or a composite resin material, and stainless steel is used in the present embodiment.

  Further, the weight body 3 is preferably a non-magnetic material and a material having a high specific gravity. In this embodiment, a tungsten sintered alloy is employed. However, it is not necessarily limited to this. In addition to tungsten (W) alloy, high specific polymerized gold mainly composed of tantalum (Ta), and as an alternative to the alloy material, inexpensive brass, composite resin material, etc. A weight member having a relatively large specific gravity and made of a nonmagnetic material is desirable. With the reduction in the diameter of the vibration actuator, it is always desired that the weight of the movable part is higher.

  Next, the operation of the vibration actuator according to the present embodiment will be described in detail with reference to the drawings.

  In the vibration actuator 1 shown in the present embodiment, when no current flows through the coil 6, as shown in FIGS. 1 and 4, the two annular permanent magnets 2 a and 2 b provided inside the housing body 7 are When the same-polar surfaces (for example, the N pole and the N pole) are opposed and fixed in close contact, the magnetic flux generated from these same-polar surfaces is bent at a substantially right angle, and the radial direction (the radial direction shown in FIG. 6). ) Produces a radial (radial) magnetic flux. For this reason, a substantially right-angled magnetic flux acts on the coil 6 that is fixedly provided at a position on the outer peripheral side where the magnetic flux passes through the side wall of the housing body 7 at a substantially right angle.

  Next, the coil 6 is fixed to the outer peripheral side of the housing body 7 through which the magnetic flux is transmitted at a substantially right angle while being wound in the peripheral direction of the housing body 7 formed in a substantially cylindrical shape. Furthermore, for example, when an alternating current having a characteristic such as a sine wave or a rectangular wave is continuously passed, the force in the vertical direction (vertical direction) in FIG. 6 is applied to the permanent magnets 2a and 2b according to Fleming's law. It will act repeatedly. The coil 6 and the mover 5 having the permanent magnets 2a and 2b are subjected to forces in the opposite directions corresponding to the action and reaction, depending on the direction of the current flowing in the coil 6, but the outer peripheral side of the housing body 7 Since the coil 6 provided at is always fixed, the mover 5 side of the permanent magnets 2a and 2b naturally repeats vibration in the vertical direction (direction of force shown in FIG. 6).

  As for the current flowing through the coil 6, the direction of the current shown in FIG. 5 (circle symbol, reverse to positive) is switched between the normal and reverse directions every short time as described above. Since a perpendicular magnetic field always acts on the coil 6, the mover 5 on the permanent magnets 2a, 2b side receives a force reversed in the vertical direction due to the switching of the forward and reverse current directions, and the mover itself Reciprocates in the direction of the arrow (force direction).

  Movable element 5 having permanent magnets 2a, 2b and weight body 3 has a central annular part 4c and a plurality of arm parts 4a, 4b on the upper surface thereof as shown in FIG. A circular recess provided in the housing body 7 when a vertical vibration force is applied to the mover 5 when suspended from the center of the inner upper surface of the housing body 7 via the leaf spring-like elastic body 4. The joint surface formed by 7a and the annular surface of the elastic body 4 is used as a reference surface and is vibrated in the vertical direction within the clearance range. Further, a gap G as shown in FIG. 4 is evenly arranged around the entire circumference between the outer diameter of the mover 5 and the inner diameter of the housing body 7 so that the mover 5 and the housing body 7 can cushion each other. Arranged not to.

  Thus, the vibration actuator 1 according to the present embodiment vibrates the mover 5 part in the magnetic circuit system of the mover 5 and the magnetic field range of the permanent magnet according to the input signal to the coil 6, The design is such that the acceleration is maximized by the resonance frequency determined by the weight of the mover 5 and the spring constant of the elastic body 4.

  As described above, according to the vibration actuator according to the present embodiment, the same poles of two axially oriented permanent magnets formed in an annular shape are arranged to face each other to generate a radial magnetic flux in the radial direction. Thereby, the magnetic flux generated from the permanent magnet is transmitted substantially perpendicularly to the coil wound in the circumferential direction on the outer peripheral side of the housing body, as shown in FIGS. 5 and 6.

  As shown in FIG. 1 (B), a large part of the inner area of the housing main body can be an area occupied by the mover, and a weight part that obtains a sufficient weight with a maximum diameter even in a space having a small outer dimension. The mover is obtained. That is, it is possible to secure the weight of the mover that can generate a sufficient amount of vibration.

  In addition, since the mover and the coil are separated from each other through the side wall of the housing body, the contact and interference between the mover and the coil caused by the deviation of the vibration direction due to a slight difference in weight distribution or the like can be reliably ensured. Can be prevented. As a result, not only the assembly process but also the coil arrangement structure can be simplified, disconnection and the like are eliminated, and durability and reliability can be greatly improved. Furthermore, when attaching the coil in the manufacturing process, there is no need to worry about the operation interference between the mover and the coil, work time for positioning and the like can be greatly shortened, and production efficiency can be improved. .

  In the present embodiment, for example, as shown in FIGS. 7 to 9, a general magnetic circuit structure is formed in a gap in which the same polarities of two annularly oriented permanent magnets 22a and 22b are opposed to each other. Similarly, a pole piece 31 made of a ferromagnetic material such as iron may be provided so as to be integrally formed as the mover 25 together with the weight body 23 formed in a disc shape.

  In this case, the weight body 23 has a columnar shape (or a disk shape) having an outer diameter substantially equal to the inner diameter of the annular permanent magnets 22a and 22b, and the two permanent magnets 22a and 22b and the pole piece 31 The thickness of the portion where the pole piece 31 and the two permanent magnets 22a and 22b are laminated is configured by being fitted to the outer portion of the laminated magnetic circuit portion to be an integral mover 25. However, the thickness and the outer shape of the mover 5 shown in FIG. Also in this case, the clearance 61A between the inner wall of the upper surface of the housing body 27 and the upper surface of the elastic body 24 shown in FIG. 7, the clearance 61B between the lower surface of the elastic body 24 and the upper surface of the weight body 23, and the lower surface of the weight body 23 When the clearance 61C with the upper surface of the substrate 20 is made equal, the maximum amplitude can be obtained in the space in the housing body 27.

  In this way, by providing the pole piece 31 having a low resistance to magnetic flux in the gap between the two permanent magnets 22a and 22b, the magnetic efficiency in the magnetic circuit can be improved, and more powerful magnetic flux is effectively used. As a result, a large vibration force can be obtained during operation.

<Second Embodiment>
Next, a second embodiment of the vibration actuator according to the present invention will be described in detail. In the second embodiment, the configuration of the magnetic circuit portion is configured by using a single axially oriented permanent magnet and a surface mounting (SMD) mounting structure in which the bottom surface of the substrate is adapted for solder reflow. Further, the material of the weight body 43 is a tungsten sintered alloy as in the first embodiment.

  As shown in FIGS. 10 and 11, in the vibration actuator 41 of the present embodiment, the housing main body 47 and the elastic body 44 are configured in the same manner as in the first embodiment, but a fixing method by solder reflow is used. As an object, unlike the first embodiment, the board design is such that the solder joint M is arranged on one side on the bottom side of the board 40. In addition, the mover 45 in the present embodiment includes a single permanent magnet 42 formed in an annular shape and pole pieces 51a and 51b joined to both upper and lower ends of the permanent magnet 42. The coil mounting position is the same as that of the first embodiment in that it is provided at the outer peripheral position of the housing body 47. In this embodiment, however, the housing body corresponding to the pole pieces 51a and 51b is further provided. Two upper and lower coils 46A and 46B are provided at the outer peripheral position, respectively.

  As shown in FIG. 12, the magnetic flux generated from the upper surface and the lower surface of the permanent magnet 42 is reversed in the direction of the magnetic flux on the N pole side and the S pole side, so that the coil 46A provided at the outer peripheral position of the corresponding housing body 47 is provided. , 46B are connected so that currents in opposite phases flow.

  Next, the operation and action of the vibration actuator 41 according to this embodiment will be described in detail below.

  In the vibration actuator 41 according to the present embodiment, the magnetic flux flow is generated from the upper surface of the permanent magnet 42 when the upper surface of the permanent magnet 42 is an N pole as shown in FIG. The magnetic flux passes through the pole piece 51a disposed on the upper surface side of the permanent magnet 42, passes through the coil 46A provided on the outer peripheral side of the housing body 47 at a substantially right angle, and then faces in the opposite direction. The magnetic flux having changed is passed through the coil 46B, led to the pole piece 51b disposed on the lower surface side of the permanent magnet 42, and returned to the permanent magnet 42.

  In addition, since the coils 46A and 46B are designed to have currents flowing in opposite directions, when the current flows through the coils 46A and 46B, the driving force for the permanent magnet 42 is the same. Acts on direction. At this time, as in the case of the first embodiment, since the coils 46A and 46B are fixed to the outer periphery of the housing body 47, the permanent magnet 42, the pole piece 51a, The entire mover 45 including the 51b and the weight body 43 reciprocally vibrates in the force direction (vertical direction) shown in FIG.

  Thus, as in the case of the first embodiment, an alternating current, such as a sine wave or a rectangular wave, whose direction of flow is reversed in a short period is passed through the coils 46A and 46B. The direction of the force acting on 45 changes in the reverse direction in a short period of time. For example, as shown by the direction of the current flowing on the coil of FIG. 12 (black and white positive and negative arrows), the coils 46A and 46B If the flowing direction changes, the direction of the acting force also changes, and the mover 45 suspended in the housing body 47 via the elastic body 44 repeats vibration according to the direction of the vertical force.

  Also in this case, as in the first embodiment, the clearance 62A between the inner wall of the upper surface of the housing body 47 and the upper surface of the elastic body 44 shown in FIG. 10 and the clearance between the lower surface of the elastic body 44 and the upper surface of the weight body 43 are shown. By ensuring the same degree of clearance 62C between 62B and the lower surface of the weight body 43 and the upper surface of the terminal board 40, the movable element 45 can obtain the maximum amplitude in the housing main body 47. For reference, in FIG. 13, the vibration operation of the mover 45 when the amplitude W is repeated within this clearance is shown by a broken line as a schematic shape.

  As described above, according to the vibration actuator 41 according to the present embodiment, the pole pieces 51a and 51b are respectively provided on the upper and lower ends of the annular permanent magnet, and the housing main body 47 corresponding to the pole pieces 51a and 51b is provided. By providing two coils 46A and 46B that are connected so that currents in opposite directions flow on the outer peripheral side, the driving force of the movable part can be obtained by improving the magnetic efficiency as in the first embodiment or higher. I was able to get it. In addition, the center of the mover 45 is provided with a weight of a heavy body made of high-specific-polymerized gold, and the width of the amplitude of the mover 45 is set so that each of the reference numerals 62A, so that the maximum swing width can be obtained in the thickness direction structurally. Since the clearance of 62B and 62C was set, sufficient vibration force was obtained as a small and small diameter vibration actuator.

They are the top view (A) which shows the outline of the vibration actuator which concerns on 1st Embodiment in this invention, and XX sectional drawing (B). They are the rear view (A) which shows the outline of the vibration actuator which concerns on 1st Embodiment in this invention, and a side view (B). 1 is an exploded perspective view of a vibration actuator according to a first embodiment of the present invention. It is a partial expanded sectional view which shows the positional relationship of the needle | mover and coil of a vibration actuator which concern on 1st Embodiment in this invention. It is a schematic sectional drawing which shows the flow of the magnetic flux produced from the whole permanent magnet of the vibration actuator which concerns on 1st Embodiment in this invention. It is a schematic sectional drawing which shows the arrangement | positioning of the flow of the magnetic flux which arises from the permanent magnet of the vibration actuator which concerns on 1st Embodiment in this invention, and a coil. They are the top view (A) which shows the outline of the modification application example of the vibration actuator which concerns on 1st Embodiment in this invention, and XX sectional drawing (B). They are the bottom view (A) which shows the outline of the modification application example of the vibration actuator which concerns on 1st Embodiment in this invention, and a side view (B). It is a schematic sectional drawing which shows the flow of the magnetic flux produced from the permanent magnet which pinched | interposed the pole piece of the deformation | transformation application example of the vibration actuator which concerns on 1st Embodiment in this invention, and arrangement | positioning of a coil. It is the top view (A) which shows the outline of the vibration actuator which concerns on 2nd Embodiment in this invention, and XX sectional drawing (B). It is the bottom view (A) which shows the outline of the vibration actuator which concerns on 2nd Embodiment in this invention, and a side view (B). It is a schematic sectional drawing which shows arrangement | positioning with the flow of the magnetic flux produced from the permanent magnet pinched | interposed with the pole piece which is a modification application example of the vibration actuator which concerns on 2nd Embodiment in this invention, and two coils. It is a schematic perspective view of the whole structure which shows the flow of the magnetic flux which arises from the permanent magnet pinched | interposed with the pole piece which is a modification application example of the vibration actuator which concerns on 2nd Embodiment in this invention, and arrangement | positioning of two coils.

Explanation of symbols

1, 21, 41 Vibration actuators 2, 22, 42 Permanent magnets 3, 23, 43 Weight bodies 4, 24, 44 Elastic bodies 5, 25, 45 Movers 6, 26, 46 Coils 7, 27, 47 Main bodies 8, 28 , 48 bore
10, 20, 40 substrate
31, 51a, 52b Pole piece

Claims (11)

A mover having a plate-like or annular permanent magnet, a housing main body that houses the mover, a thin plate-like elastic body that supports the mover and the housing main body connected to each other, and drives the mover A vibration actuator comprising a coil,
The permanent magnet is oriented so that a magnetic flux is generated in the radial direction at the radial outer periphery of the permanent magnet,
The vibration actuator, wherein the coil is provided in an annular shape along an outer peripheral side surface of the housing body made of a nonmagnetic material. 2. The vibration actuator according to claim 1, wherein the coil is provided at a position where the outer peripheral side surface of the housing body is wound in a strip shape and passes substantially perpendicularly to a magnetic flux generated from the permanent magnet. The permanent magnet is movably provided within a range in which a magnetic field of magnetic flux substantially perpendicular to a coil provided on the outer peripheral side surface of the housing main body is located on the outer periphery of the mover. The vibration actuator according to claim 1 or 2. The permanent magnet is a united structure in which the same pole surfaces of two axially oriented permanent magnets are arranged opposite to each other, and the direction of the magnetic flux at the opposite position of the same pole surface is the same as the radial direction of the permanent magnet. The vibration actuator according to any one of claims 1 to 3, wherein the vibration actuator is oriented in a direction. 4. The vibration actuator according to claim 1, wherein the permanent magnet is at least one radial-oriented permanent magnet. 5. The vibration actuator according to any one of claims 1 to 5, wherein a pole piece for guiding magnetic flux is provided on a part of the mover. The movable element has two axially oriented permanent magnets formed in a plate shape or an annular shape and one pole piece, and the pole piece is formed of two axially oriented permanent magnets formed in a plate shape or an annular shape. The vibration actuator according to claim 1, wherein the vibration actuator is provided between the same poles facing each other. The mover has one axially oriented permanent magnet and two pole pieces formed in a plate shape or annular shape having substantially the same diameter, and the two pole pieces have a thickness of the axially oriented permanent magnet. The vibration actuator according to claim 1, wherein the vibration actuator is provided at both upper and lower ends in the direction. The mover has a substantially disc-shaped weight body at the center thereof, and has an outer diameter close to the inner wall of the housing body with respect to a radial direction substantially perpendicular to the vibration direction of the mover. The vibration actuator according to any one of claims 1 to 8. The vibration actuator according to any one of claims 1 to 9, wherein the weight body is formed of a weight of a nonmagnetic material whose main component is high specific polymerization gold such as tungsten. 10. The vibration actuator according to claim 1, wherein the weight body is formed of a weight of a general non-magnetic material having a large specific gravity such as brass.

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