JP3348126B2 - Oscillating vibration actuator with movable magnet - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to control equipment, electronic equipment,
The present invention relates to a movable magnet type oscillating vibration actuator that converts electric energy into oscillating kinetic energy by electromagnetic action in a machine tool or the like.

[0002]

2. Description of the Related Art Actuators that convert electric energy into kinetic energy by electromagnetic action include those that perform reciprocating vibration motion using a combination of a DC solenoid and a spring, and those that perform reciprocating vibration motion using a combination of a permanent magnet and a coil. Are known as linear motion actuators.

Further, as an actuator for performing a reciprocating rotational motion (oscillating motion), an interaction between an electromagnetic pole that generates a magnetic field by energizing a coil and a magnetic pole of the magnet rotor causes the magnet rotor to perform a reciprocating turning operation. A reciprocating slewing motor has been proposed in Japanese Patent Application Laid-Open No. 50-22221.

[0004]

The linear motion actuator described above needs to slidably support a movable body that performs a reciprocating vibration motion, so that it is difficult to extend the life of the linear motion actuator, and the end portion absorbs the momentum. I hate energy loss is big.

Further, the reciprocating turning motor disclosed in Japanese Patent Application Laid-Open No. 50-22221 has a structure similar to a DC motor or the like,
A core or the like for constituting an electromagnetic pole is required, and the structure is complicated. In addition, no special consideration is given to speeding up the swinging motion and increasing the efficiency.

[0006] A first object of the present invention is to solve the above problems,
It is an object of the present invention to provide a movable magnet type oscillating vibration actuator capable of increasing the efficiency of oscillating motion.

A second object of the present invention is to provide a movable magnet type oscillating vibration actuator having a structure suitable for speeding up the oscillating motion.

A third object of the present invention is to provide a movable magnet type oscillating vibration actuator having a simple structure and a structure suitable for miniaturization.

[0009] Other objects and novel features of the present invention will be clarified in embodiments described later.

[0010]

In order to achieve the above object, a movable magnet type oscillating vibration actuator according to the present invention is provided so as to be capable of oscillating on a fulcrum axis and a plane perpendicular to the fulcrum axis. In a configuration comprising: a swinging magnet body in which at least one rare-earth permanent magnet is integrated; and a coil that generates a swinging torque in the swinging magnet body, the coil has a winding wound around a bobbin.
The swing fulcrum shaft is fixed to the bobbin or
Is rotatably supported, and the winding of the coil is
The bobbin includes a rare-earth permanent magnet or a soft-magnetic material return force generating means which is arranged to orbit around the magnet body and generates a return force for returning the rocking magnet body to the center position of the rocking motion. An alternating current having a frequency near the natural frequency of the oscillating motion of the oscillating magnet body caused by the return force is supplied to the coil.

Further, a plurality of (for example, two) permanent magnets may be arranged at positions symmetrical with respect to the axis of the fulcrum to constitute the oscillating magnet body.

[0012]

[0013]

[0014]

According to the movable magnet type swing vibration actuator of the present invention, the returning force of the swinging magnet body to return to the center position (origin position) of the swinging motion is changed by the returning force of a permanent magnet, a soft magnetic material, a spring or the like. It is generated by the generating means, but due to this returning force, the oscillating magnet body has a natural frequency (resonant frequency) of the oscillating motion.
have. Therefore, the frequency of the alternating current flowing through the coil that generates the oscillating thrust is set near the natural frequency so that the oscillating thrust and the natural vibration based on the return force resonate, and a high-speed, high-efficiency oscillating motion is performed. Can be performed. The resonance frequency can be increased by reducing the inertia of the oscillating magnet body, that is, by reducing the inertia ratio or increasing the centripetal force (the force for returning to the center position of the oscillating motion).

Further, when a plurality of (for example, two) permanent magnets are arranged at positions symmetrical with respect to the axis of the fulcrum to constitute the oscillating magnet body, the magnetic moment is increased and the inertia is reduced. Thus, the resonance frequency of the oscillating motion of the oscillating magnet body can be increased.

When the permanent magnet of the oscillating magnet body and the permanent magnet constituting the return force generating means are rare earth permanent magnets, the magnetic moment of the oscillating magnet body can be increased and the inertia can be reduced, and the return force can be reduced. Can be increased, and the resonance frequency of the oscillating motion of the oscillating magnet can also be increased.

When the swing fulcrum shaft is fixed or rotatably supported on the bobbin of the coil, the structure can be simplified and the size can be reduced.

[0018]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing an embodiment of a movable magnet type oscillating vibration actuator according to the present invention.

FIGS. 1 and 2 show a first embodiment of the present invention. In these figures, reference numeral 1 denotes a coil in which a winding 8 is provided on a bobbin 2 made of insulating resin or the like. The bobbin 2 has flanges 2b on both sides of a winding drum 2a having a rectangular cross section in a rectangular cross section, and the winding 8 is wound around the outer periphery of the winding drum 2a.

The oscillating magnet body 10 is formed by integrating two disc-shaped rare earth permanent magnets 4a and 4b and a bearing 5 with a non-magnetic lightweight holder 3 made of aluminum or the like. The arm part 6 is formed integrally. The integration of the rare earth permanent magnets 4a, 4b and the bearing 5 with the holder 3
The rare earth permanent magnets 4a, 4b and the bearing 5 are respectively fitted and fixed (adhered) to the holes 3a, 3b, 3c formed in advance.
It is done by doing. The center hole 5 of the bearing 5
The rare earth permanent magnets 4a and 4b are arranged at positions symmetrical with respect to a. As shown in FIG. 1, the magnetization directions of the rare-earth permanent magnets 4a and 4b coincide with the X direction which is the longitudinal direction of the main body portion 10a of the oscillating magnet body 10 passing through the center hole 5a of the bearing 5, and the direction of the magnetic poles (The north pole is facing left). The longitudinal end of the main body 10a has a shape in which the outer shape of the holder 3 is cut in an arc shape along the outer shape of the rare earth permanent magnets 4a, 4b in order to reduce excess mass. Such a swinging magnet body 10 swings around the swinging fulcrum shaft 7 when the swinging fulcrum shaft 7 fixed to the winding drum portion 2a of the bobbin 2 passes through the center hole 5a of the bearing 5. The bobbin 2 is freely supported. That is, the oscillating magnet body 10 can perform oscillating motion in a plane perpendicular to the oscillating fulcrum shaft 7. In addition, as shown in FIG.
And the winding 8 is arranged so as to surround the oscillating magnet body 10.
Has become.

The rectangular fixed rare earth permanent magnets 11a and 11b for generating a restoring force for returning the oscillating magnet body 10 to the center position of the oscillating motion (the state shown in FIG. 1) are provided on the bobbin 2. It is disposed and fixed inside the winding 8 outside the winding drum 2a. In the case of FIG.
The center position of the rocking motion of 0 corresponds to the position where the rocking torque is maximized. Each fixed rare earth permanent magnet 11a, 11b
Are set so as to attract the magnetic poles at both ends of the main body portion 10a of the oscillating magnet body 10, respectively.

An annular soft magnetic yoke 12 is mounted (fixed) outside the coil 1 and surrounds the outside of the winding 8. The yoke 12 functions to strengthen the magnetic field generated by the coil 1 inside the yoke and reduce the leakage magnetic field to the outside of the yoke.

In the configuration of the first embodiment, the electromagnetic force (reaction force of the force acting on the coil based on Fleming's left hand rule) acting between the magnetic field of the oscillating magnet body 10 and the current of the coil 1 causes the oscillation. The moving magnet body 10 generates oscillating torque, and the coil 1
By applying an alternating current to the oscillating arm, the oscillating motion can be periodically reversed to cause the oscillating motion, and the oscillating arm 6 of the oscillating magnet body 10 can be oscillated to achieve a desired mechanical operation. It is possible to do.

Further, the returning rare earth permanent magnets 11a and 11b as return force generating means generate a return force for returning the rocking magnet body 10 to the center position (origin position) of the rocking motion. Due to the force, the oscillating magnet body 10 has a natural frequency (resonant frequency) of the oscillating motion. Therefore, the frequency of the alternating current flowing through the coil 1 that generates the oscillating thrust is set near the natural frequency so that the oscillating thrust and the natural vibration based on the return force resonate, and high-speed, high efficiency and sufficient amplitude Rocking motion with The resonance frequency can be increased by reducing the inertia of the oscillating magnet body 10, that is, by reducing the inertia rate or increasing the centripetal force (the force for returning to the center position of the oscillating motion).

Here, when the natural angular frequency of the oscillating magnet body 10 is ω ₀ , the moment of inertia is J, and the rigidity coefficient is K, ω ₀
= (K / J) ^1/2 , and the coil 1 is supplied with an AC input having a frequency in the vicinity of the natural angular frequency (within ± 15%) to operate the coil 1, thereby enabling high-efficiency operation. It is. If the value is out of the range of ± 15%, the effect of improving the efficiency is undesirably reduced. Further, the resonance frequency f of the natural vibration of the oscillating magnet body 10 is f = (ω ₀ / 2π) .

According to the first embodiment, the following effects can be obtained.

(1) The oscillating magnet body 10 is an actuator that oscillates around the oscillating fulcrum shaft 7, and the bearing has a longer life than a linear actuator.

(2) The rocking position can be determined by adding fixed rare earth permanent magnets 11a and 11b as a return force generating means for returning the rocking magnet body 10 to the rocking center position (origin position). . Further, since the magnetic attraction of the fixed rare earth permanent magnets 11a and 11b is used, the structure is simple and the life can be extended. At this time, since the fixed rare earth permanent magnets 11a and 11b are located inside the winding 8 wound around the bobbin 2, it is easy to sufficiently increase the magnetic attraction force of the fixed rare earth permanent magnets 11a and 11b.

(3) Fixed rare earth permanent magnets 11a, 11b
Although the oscillating magnet body 10 has a natural frequency (resonant frequency) of the oscillating motion due to the return force of the above, the frequency of the alternating current flowing through the coil 1 that generates the oscillating thrust is set near the natural frequency. By causing the oscillation thrust to resonate with the natural vibration based on the return force, the oscillation can be executed at high speed, with high efficiency and with sufficient amplitude.

(4) Two rare-earth permanent magnets 4a and 4b are arranged at positions symmetrical with respect to the fulcrum shaft 7 to constitute the oscillating magnet body 10, and only the center of the fulcrum shaft 7 is provided. As compared with the case where one permanent magnet is arranged, a magnet having a large weight can be effectively arranged, so that the magnetic moment is large and the inertia is small, and the resonance frequency of the oscillating motion of the oscillating magnet body 10 is increased. be able to. In addition, a rare earth permanent magnet 4a,
Since the bearing 4b is not located, the bearing 5 can be easily arranged (it is only necessary to form a hole in the nonmagnetic lightweight holder 3 and fix it, and it is not necessary to provide a hole or the like on the permanent magnet side).

FIG. 3 shows a second embodiment of the present invention. In the second embodiment, the oscillating magnet body 20 includes two disc-shaped rare-earth permanent magnets 4a, 4
b and the bearing 5 are integrated, but the magnetization direction of at least one of the rare earth permanent magnets 4a and 4b is the longitudinal direction of the main body portion 20a of the oscillating magnet body 20 passing through the center hole 5a of the bearing 5. From the direction by an angle θ (where θ
Is 90 ° or less). Other components are the same as those of the first embodiment.
This is the same as the embodiment, and the same or corresponding portions are denoted by the same reference characters and description thereof is omitted.

In the case of the second embodiment, the center position of the oscillating magnet body 20, that is, the return position of the oscillating arm 6, is shifted from the X direction of the rare earth permanent magnets 4a, 4b. It can be arbitrarily changed as shown by a virtual line in FIG.

FIGS. 4 and 5 show a third embodiment of the present invention. In the third embodiment, the oscillating magnet body 30 is formed by integrating one long disk-shaped rare earth permanent magnet 34 and the bearing 5 with a non-magnetic lightweight holder 33 made of aluminum or the like. The swing arm 36 is integrally formed. The rare earth permanent magnet 34 is integrated with the holder 33 by inserting a rare earth permanent magnet 34 into a hole 33 a formed in the holder 33 in advance.
The bearing 5 is integrated by attaching and fixing (adhering) the bearing 5 into the central hole 34 a of the rare earth permanent magnet 34. 4, the magnetizing direction of the rare earth permanent magnet 34 coincides with the X direction which is the longitudinal direction of the main body portion 30a of the oscillating magnet body 30 passing through the center hole 5a of the bearing 5, and as shown in FIG.
Rare earth permanent magnet 34 at a position symmetrical with respect to
Are arranged. The longitudinal end of the main body portion 30a has a shape in which the outer shape of the holder 33 is cut in an arc shape along the outer shape of the rare earth permanent magnet 34 in order to reduce excess mass. Such a swinging magnet body 30 is swingable about the swinging fulcrum shaft 7 as the swinging fulcrum shaft 7 fixed to the bobbin 2a of the bobbin 2 passes through the center hole 5a of the bearing 5. Is supported by the bobbin 2. That is, the oscillating magnet body 30 can perform oscillating motion in a plane perpendicular to the oscillating fulcrum shaft 7. The other components are the same as those in the first embodiment, and the same or corresponding portions are denoted by the same reference characters and description thereof will be omitted.

In the case of the third embodiment, the structure can be further simplified by using one rare earth permanent magnet 34 having a large longitudinal dimension. An engaging groove 36a is formed at the tip of the swing arm portion 36 of the swing magnet body 30, and can be used by being engaged with the driven side portion.

FIGS. 6 and 7 show a fourth embodiment of the present invention. In these figures, a coil 41 is provided with a winding 48 provided on a bobbin 42 made of insulating resin or the like. Bobbin 42
Has a flange portion 42b on both sides of a winding drum portion 42a having a rectangular cross section in a rectangular cross section, and has the winding 48 on the outer periphery of the winding drum portion 42a.
Is wound.

The oscillating magnet body 30 has the same structure as that of the above-described third embodiment, in which a single non-magnetic lightweight holding body 33 made of aluminum or the like is integrated with one long disk-shaped rare earth permanent magnet 34 and the bearing 5. The swing arm 36 is formed integrally with the holder 33. The oscillating magnet 30 includes a fulcrum shaft 7 fixed to the bobbin portion 42 a of the bobbin 42.
Is supported by the bobbin 42 so as to be swingable about the swing fulcrum shaft 7. That is, the oscillating magnet body 30 can perform the oscillating motion in a plane perpendicular to the oscillating fulcrum shaft 7.

The rectangular fixed rare earth permanent magnets 51a and 51b for generating a restoring force for returning the oscillating magnet body 30 to the center position of the oscillating movement (the state shown in FIG. 6) are provided on the bobbin 42. The winding 48 wound around the winding drum portion 42a
And is fixed between the flanges 42b outside of the front. In the case of FIG.
The center position of the rocking motion of the rocking magnet body 30 coincides with the position where the rocking torque is maximized. The directions of the magnetic poles of the fixed rare earth permanent magnets 51a and 51b are set so as to attract the magnetic poles at both ends of the main body portion 30a of the oscillating magnet body 30, respectively.

An annular soft magnetic yoke 12 is mounted (fixed) outside the coil 41 and surrounds the outside of the winding 48. The yoke 12 functions to strengthen the magnetic field generated by the coil 41 inside the yoke and reduce the leakage magnetic field to the outside of the yoke.

The other components are the same as those of the third embodiment described above, and the same or corresponding portions are denoted by the same reference characters and description thereof is omitted.

According to the fourth embodiment, the oscillating magnet 30
Cubic fixed rare earth permanent magnet 5 for generating a restoring force for returning the magnet to the center position (the state shown in FIG. 6) of the rocking motion.
Since 1a and 51b are arranged outside the winding 48 wound around the winding drum portion 42a of the bobbin 42, the distance between the winding 48 of the coil 41 and the magnetic pole of the oscillating magnet body 30 can be shortened. The torque can be increased.

FIGS. 8 and 9 show a fifth embodiment of the present invention. In this embodiment, one fixed rare earth permanent magnet 61 and a soft magnetic yoke 62 generate a return force for returning the oscillating magnet body 30 to the center position of the oscillating motion (the state shown in FIG. 8). ing. That is, the fixed rare earth permanent magnet 61
The tip of the yoke 62 joined to the magnetic pole is fixed between the bobbin flanges 42b outside the windings 48 of the coil 41.
The orientation of the magnetic pole of the fixed rare earth permanent magnet 61 is
The magnetic poles at both ends of the 0 main body portion 30a are set to be attracted respectively. Note that the plate-shaped soft magnetic yoke 12 is provided above and below the coil 41. A hole 36b is formed in the swing arm portion 36 of the swing magnet body 30, and the hole 36b can be used to connect to the driven side. The other components are the same as those of the above-described fourth embodiment, and the same or corresponding portions are denoted by the same reference numerals and description thereof will be omitted.

According to the fifth embodiment, there is an advantage that only one fixed rare earth permanent magnet 61 is required for the permanent magnet for generating the restoring force.

FIGS. 10 and 11 show a sixth embodiment of the present invention. In these figures, a coil 71 is obtained by providing a winding 78 on a bobbin 72 made of insulating resin or the like. Bobbin 7
Numeral 2 has flange portions 72b on both sides of a winding drum portion 72a having a rectangular cross section in a rectangular cross section.
8 are wound. Further, a pair of holding portions 72c is formed outside the one flange portion 72b.

The oscillating magnet body 80 is formed by integrating one long disk-shaped rare earth permanent magnet 84 and a bearing 5 into a non-magnetic lightweight holder 83 made of aluminum or the like. The part 86 and the sub-arm part 87 extending to the opposite side are integrally formed. The integration of the rare earth permanent magnet 84 with the holder 83 is performed by using the holes 8 formed in the holder 83 in advance.
This is performed by inserting and fixing (adhering) the rare-earth permanent magnet 84 to the center of the rare-earth permanent magnet 84.
The bearing 5 is integrated by fitting and adhering (adhering) the bearing 5 to a. As shown in FIG. 10, the magnetization direction of the rare-earth permanent magnet 84 coincides with the X direction which is the longitudinal direction of the main body portion 80a of the oscillating magnet body 80 passing through the center hole 5a of the bearing 5. The magnetic poles of the rare-earth permanent magnet 84 are arranged symmetrically with respect to the center hole 5a.
Note that the longitudinal end of the main body portion 80a has a shape in which the outer shape of the holder 83 is cut in an arc shape along the outer shape of the rare earth permanent magnet 84 in order to reduce excess mass. Such an oscillating magnet body 80 is provided on the bobbin 72a of the bobbin 72.
Is supported by the bobbin 72 so as to be swingable about the swing fulcrum shaft 7 by passing through the center hole 5 a of the bearing 5. That is, the oscillating magnet body 80 can perform oscillating motion in a plane perpendicular to the oscillating fulcrum shaft 7.

In order to generate a restoring force for returning the oscillating magnet body 80 to the center position of the oscillating motion (the state shown in FIG. 10), a fixed rare earth permanent element is attached to the pair of holding portions 72c on the bobbin 72 side. While the magnets 91a and 91b are fixed,
Rare earth permanent magnets 92a and 92b as sub magnets are fixed to both sides of the sub arm 87 on the swing magnet body 80 side. The fixed rare-earth permanent magnets 91a and 91b and the rare-earth permanent magnets 92a and 92b are arranged to face each other so as to generate magnetic repulsion.

In the case of the sixth embodiment, a return force for returning the oscillating magnet body 80 to the center position of the oscillating motion (the state shown in FIG. 10) is realized by a magnetic repulsive force. The natural frequency (resonance frequency) of the oscillating motion of the oscillating magnet body 80 can be increased by increasing the repulsive force between the oscillating magnet body 91a and 91b and the rare-earth permanent magnets 92a and 92b.

Although not shown in the sixth embodiment, a soft magnetic yoke may be provided so as to surround the coil 71.

[0048]

[0049]

[0050]

FIG. 12 shows a seventh embodiment of the present invention. In this case, the oscillating magnet body 110 in which the two rare-earth permanent magnets 4a, 4b are integrated has two oscillating arm portions 111a, 111
b are symmetrical (in opposite directions and on a straight line).
That is, the oscillating magnet body 110 is composed of two disc-shaped rare earth permanent magnets 4a, 4b
And the bearing 5 are integrated, and the holding body 113 is integrally formed with swing arm portions 111a and 111b. The other components are the same as those of the first embodiment, and the same or corresponding portions are denoted by the same reference numerals and description thereof will be omitted.

According to the seventh embodiment, the swing arms 111a and 111b protrude from both sides of the coil 1, so that the swing output can be taken out from both sides.

FIGS. 13 and 14 show an eighth embodiment of the present invention. In this figure, a swing fulcrum shaft 7 is attached to a swing magnet body 10.
The swinging fulcrum shaft 7 is rotatably supported on the bobbin 2 by a fixed bearing 5. The swing fulcrum shaft 7 projects above the coil 1 (or both the upper and lower portions) as a swing output shaft. The other components are the same as those in the first embodiment described above, and the same or corresponding portions are denoted by the same reference characters and description thereof is omitted.

According to the eighth embodiment, the swing fulcrum shaft 7 can be used directly as a swing output shaft and can be connected to the driven side.

In the embodiments described above, the oscillating magnet body is caused to oscillate by utilizing magnetic attraction or magnetic repulsion between the permanent magnet of the oscillating magnet body and the fixed permanent magnet fixed to the coil side. Generated a return force to return to the center position (origin position), but the fixed permanent magnet on the coil side can be replaced with a soft magnetic material. The return force may be generated by the magnetic attraction force (however, the return force becomes weaker).

Although the embodiments of the present invention have been described above, it is obvious to those skilled in the art that the present invention is not limited to the embodiments and various modifications and changes can be made within the scope of the claims. Would.

[0057]

As described above, according to the movable magnet type oscillating vibration actuator of the present invention, at least one oscillating fulcrum axis and at least one oscillating free axis in a plane perpendicular to the oscillating fulcrum axis.
In a configuration including an oscillating magnet body integrated with a rare earth permanent magnet and a coil that generates oscillating torque in the oscillating magnet body, the coil is formed by winding a winding around a bobbin.
And the swing fulcrum shaft is fixed or rotatable on the bobbin.
Support, and the winding of the coil surrounds the oscillating magnet body
And disposed orbiting as, the rare earth permanent magnet oscillating magnet for generating a return force for returning to the center position of the swinging movement or soft
Since a return force generating means for the magnetic body is provided on the bobbin side, an alternating current having a frequency near the natural frequency of the oscillating motion of the oscillating magnet body caused by the return force is supplied to the coil. The following effects can be obtained.

(1) The oscillating magnet is an actuator that oscillates about the axis of the fulcrum, and the bearing has a longer life than a linear actuator.

(2) A swinging position can be determined by adding a permanent magnet or soft magnetic material restoring force generating means for returning the swinging magnet body to the swinging center position (origin position).

(3) Due to the restoring force of the restoring force generating means, the oscillating magnet body has a natural frequency (resonant frequency) of the oscillating motion.
However, by setting the frequency of the alternating current flowing through the coil that generates the oscillating thrust near the natural frequency and causing the oscillating thrust and the natural vibration based on the return force to resonate, at high speed and with high efficiency A swinging motion having a sufficient amplitude can be performed.

[Brief description of the drawings]

FIG. 1 is a plan sectional view showing a first embodiment of a movable magnet type oscillating vibration actuator according to the present invention.

FIG. 2 is a front view showing a part of the first embodiment in cross section.

FIG. 3 is a plan sectional view of a second embodiment of the present invention.

FIG. 4 is a plan sectional view of a third embodiment of the present invention.

FIG. 5 is a front view of the same.

FIG. 6 is a plan sectional view of a fourth embodiment of the present invention.

FIG. 7 is a front view of the same.

FIG. 8 is a plan sectional view of a fifth embodiment of the present invention.

FIG. 9 is a front view of the same.

FIG. 10 is a plan sectional view of a sixth embodiment of the present invention.

FIG. 11 is a front view of the same.

FIG. 12 is a plan sectional view of a seventh embodiment of the present invention.

FIG. 13 is a front view of an eighth embodiment of the present invention .

FIG. 14 is a plan sectional view of the same.

[Explanation of symbols]

1, 41, 71 Coil 2, 42, 72 Bobbin 3, 33, 83, 113 Holder 4a, 4b, 34, 84 Rare earth permanent magnet 5 Bearing 6, 36, 86, 111a, 111b Swing arm 7 Swing fulcrum Shafts 8, 48, 78 Windings 10, 30, 80, 110 Oscillating magnet bodies 11a, 11b, 51a, 51b, 61, 91a, 91
b Fixed rare earth permanent magnet 12,62 Soft magnetic yoke 92a, 92b Rare earth permanent magnet

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Hiroshi Ito 1-13-1 Nihonbashi, Chuo-ku, Tokyo Inside TDK Corporation (56) References JP-A-2-74143 (JP, A) JP-A-2 -55563 (JP, A) JP-A-5-168195 (JP, A) Japanese Utility Model Application Sho 55-158679 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) H02K 33/16 H01F 7/08

Claims (2)

(57) [Claims] An oscillating fulcrum shaft, an oscillating magnet body integrated with at least one rare earth permanent magnet oscillating in a plane perpendicular to the oscillating fulcrum axis, and an oscillating magnet body. And a coil for generating a dynamic torque, wherein the coil has a coil wound around a bobbin.
The swing fulcrum shaft is fixed or rotatably supported on the bobbin,
And the winding of the coil surrounds the oscillating magnet body.
A return-force generating means of a rare-earth permanent magnet or a soft magnetic material for generating a return force for returning the oscillating magnet body to the center position of the oscillating motion is provided on the bobbin side; A magnet movable type oscillating vibration actuator characterized in that an alternating current having a frequency near the natural frequency of the oscillating motion of the oscillating magnet body caused by the above is supplied to the coil. 2. A movable magnet type rocking vibration actuator according to claim 1, wherein a plurality of rare earth permanent magnets are arranged at positions symmetrical with respect to the axis of the rocking fulcrum to form a rocking magnet body.