JP3479122B2 - Vibration actuator and pager calling device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration actuator and a pager calling device using the vibration actuator.

[0002]

2. Description of the Related Art A pager uses two types of calling methods, that is, calling using sound and calling using vibration. In the call by sound, the sound is intermittently generated and the sound is gradually increased. In this case, it is realized by changing the current (voltage) supplied to the speaker, the buzzer (vibrator), or the like.

When calling by vibration, a vibration motor having an unbalanced weight attached to a rotor is generally used as a vibration generating means. This vibration motor generates the necessary vibration by rotating an unbalanced weight attached to the tip of the rotor.
As the vibration motor, a small DC motor that can be driven by the pager battery is used.

[0004]

However, the vibration motor having the above structure has the following problems. Although a cylindrical or flat type DC motor is used, it is necessary to use a motor that rotates at high speed and with sufficient torque in order to generate sufficient vibration that the user can feel. However, the pager must use a small motor due to the demand for thinning, but a remarkably small motor cannot generate sufficient vibration. Therefore, in order to generate sufficient vibration, a large motor has to be used to some extent. For this reason, the extremely thin pager does not have a vibration calling mode,
There are some that can only be called by sound.

Further, since the DC motor is used as the vibration generating means, the parts such as the brush have a long service life. Therefore, stable performance cannot be maintained for a long period of time. Actually, there is a problem that the number of revolutions changes as time passes. Further, the DC motor has a problem that electric noise is generated from the brush.

In the case of a DC motor, the rated speed is fixed, and it is difficult to arbitrarily change the speed if the applied voltage is constant. Therefore, the frequency is determined by the number of rotations, and this frequency cannot be changed. In addition, as a matter of course, the amplitude of vibration cannot be changed. Therefore, when slow vibration with a low frequency or vibration with a small amplitude is required, it is impossible to make any change even when the amplitude of the vibration is gradually increased to make a reliable call.
Moreover, it has not been possible to deal with the occurrence of intermittent vibration. Therefore, it is only possible to continuously vibrate with a constant amplitude.

Further, since vibration is generated by rotation, vibrations other than the direction sensitive to the user (direction perpendicular to the human body surface) are also included. Therefore, although the efficiency of converting the electric power into the rotary motion is high, there is also a problem that the effectively acting force of the generated vibration is small and the vibration transmission efficiency is low.

There are brushless motors that do not use brushes even if they are DC-driven motors, but in this case as well, it is impossible to change the number of revolutions. Further, this brushless motor requires a dedicated electronic circuit for generating a rotating magnetic field, is inefficient, and is not suitable for a pager which is required to be small and thin.

The present invention has been made in view of the above problems, and a first object thereof is to provide a vibration actuator having high vibration transmission efficiency and capable of generating vibrations of arbitrary frequencies and amplitudes. It is in.

A second object of the present invention is to provide a pager calling device having high vibration transmission efficiency and capable of generating vibrations of arbitrary frequencies and amplitudes.

[0011]

A first means for solving the above-mentioned problems is to wrap a base portion of a flat plate-shaped magnetic body having a plurality of cut and raised parts and the plurality of cut and raised parts. Coil, a spindle supported by the central portion of the flat plate-like base portion, and a spindle movably supported by the spindle via a holding means, and between the plurality of cut and raised portions and the spindle. A yoke having a plurality of bent portions arranged so as to face the cut-and-raised portion in a space, and provided in a portion facing the coil on the outer surface of the bent portion of the yoke and magnetized in the radial direction. A vibration actuator having a magnet.

A second means for solving the above-mentioned problems is a base portion of a flat plate-shaped magnetic body having a plurality of cut and raised portions, a coil wound around each of the plurality of cut and raised portions, and the flat plate shaped portion. A spindle supported by the central part of the base part of the base, and movably supported by the spindle in the axial direction via a holding means, and the cut and raised part in a space between the plurality of cut and raised parts and the spindle. A yoke having a plurality of bent portions arranged so as to face each other, a magnet provided in a portion facing the coil on the outer surface of the bent portion of the yoke, and magnetized in the radial direction; An elastic body which is disposed between the flat plate-shaped base portion and positions the holding means so that the bent portions of the coil and the yoke are in a position facing each other. It is a vibration actuator.

A third means for solving the above-mentioned problems is a base portion of a flat magnetic material having a plurality of cut and raised portions,
A coil wound around each of the plurality of cut-and-raised parts, a shaft supported by the central portion of the flat plate-shaped base part, and movably supported in the axial direction by a holding means on the shaft, A yoke having a plurality of bent portions arranged so as to face the cut and raised portions in a space between the plurality of cut and raised portions and the spindle, and the coil facing the outer surface of the bent portion of the yoke. A magnet magnetized in the radial direction, the holding means is disposed between the shaft and the yoke, and the coil and the bent portion of the yoke are positioned so as to face each other. The vibration actuator is an elastic body for positioning the yoke.

A fourth means for solving the above-mentioned problems is to provide a base portion of a flat magnetic material having a plurality of cut and raised portions,
A coil wound around each of the plurality of cut-and-raised parts, a spindle supported by the central portion of the flat plate-shaped base part, and a spindle movably supported by the spindle via a holding means, It has a plurality of bent portions arranged to face the cut and raised portions in a space between the plurality of cut and raised portions and the spindle, and vibrates according to a magnetic field generated by an alternating current supplied to the coil or An audible sound is provided according to an alternating current supplied, which has a yoke that generates an audible sound and a magnet that is provided in a portion facing the coil on the outer surface of the bent portion of the yoke and that is magnetized in the radial direction. Alternatively, the pager calling device is characterized by using a vibration actuator that generates low-frequency vibration.

A fifth means for solving the above-mentioned problems is to provide a base portion of a flat plate-shaped magnetic body having a plurality of cut and raised portions, a coil wound around each of the plurality of cut and raised portions,
A spindle supported by the central portion of the flat plate-shaped base portion and a spindle are supported by the spindle so as to be movable in the axial direction via a holding means, and the cutting and raising are performed in a space between the plurality of cutting and raising portions and the spindle. A yoke that has a plurality of bent portions arranged so as to face each other and that vibrates or produces an audible sound in accordance with a magnetic field generated by an alternating current supplied to the coil; and on the outer surface of the bent portion of the yoke. A vibration actuator that is provided at a portion facing the coil and that has a magnetized in the radial direction and that generates an audible sound or vibration, and a predetermined value that is used to generate an audible sound or low-frequency vibration used for calling the pager. For a pager, which is provided with a signal generator for generating an alternating current having a frequency of It is a fine-out equipment.

[0016]

In the vibration actuator which is the first means for solving the problem, the coil of the cut and raised portion, the magnet,
A magnetic circuit is formed by the path of the bent portion of the yoke, the yoke, the bent portion of the yoke, the magnet, the coil of the cut and raised portion, and the flat base portion. When a current is applied to the coil in this magnetic circuit, thrust is generated in the yoke provided with the magnet as a reaction of the thrust generated in the coil,
The yoke moves in the axial direction of the spindle via the holding means. If the current supplied to the coil is an alternating current, the yoke and the base portion vibrate according to the waveform of the current.

In the vibration actuator which is the second means for solving the problem, in the coil actuator of the cut and raised portion, the magnet, the bent portion of the yoke, the yoke, the bent portion of the yoke, the magnet, the coil of the cut and raised portion, and the flat plate-shaped base portion. A magnetic circuit is formed along the path. When a current is applied to the coil in this magnetic circuit, a thrust is generated in the yoke provided with the magnet as a reaction of the thrust generated in the coil, and the yoke moves in the axial direction of the spindle through the holding means positioned by the elastic body. Move to. If the current supplied to the coil is an alternating current, the yoke and the base portion vibrate according to the waveform of the current.

In the vibration actuator which is the third means for solving the problem, in the coil actuator of the cut and raised portion, the magnet, the bent portion of the yoke, the yoke, the bent portion of the yoke, the magnet, the coil of the cut and raised portion, and the flat plate-shaped base portion. A magnetic circuit is formed along the path. When a current is applied to the coil in the magnetic circuit, a thrust is generated in the yoke provided with the magnet as a reaction of the thrust generated in the coil, and the yoke moves in the axial direction of the shaft through the elastic body. If the current supplied to the coil is an alternating current, the yoke and the base portion vibrate according to the waveform of the current.

In the pager calling device which is the fourth means for solving the problem, in the cut-and-raised portion coil, magnet, yoke bent portion, yoke, yoke bent portion, magnet, cut-and-raised portion coil, and flat plate-shaped member. A magnetic circuit is formed in the path of the base portion. When an electric current is applied to the coil in the magnetic circuit, a thrust is generated in the yoke provided with the magnet as a reaction of the thrust generated in the coil, and the yoke moves in the axial direction of the spindle via the holding means. The frequency of the alternating current supplied to the coil,
The yoke and the base portion vibrate according to the amplitude, generating sound or vibration.

In the pager calling device which is the fifth means for solving the problem, in the coil of the cut and raised portion, the magnet, the bent portion of the yoke, the yoke, the bent portion of the yoke, the magnet, the coil of the cut and raised portion, and the flat plate shape. A magnetic circuit is formed in the vibration actuator along the path of the base portion. When an alternating current is passed through the coil in the magnetic circuit from the signal generating portion, the yoke and the base portion vibrate according to the frequency and amplitude of the alternating current, generating audible sound or low frequency vibration.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described with reference to the drawings. 1 is a sectional view of an embodiment of the present invention, FIG. 2 is a left side view of FIG. 1, and FIG. 3 is a plan view of FIG.

In these figures, the base portion 1 has a plurality of cut-and-raised portions (in this embodiment, the first cut-and-raised portion 1).
a, a flat magnetic body having a second cut-and-raised portion 1b).

The first coil 2 is a solenoid coil wound around the cut and raised portion 1a, and the second coil 3 is a solenoid coil wound around the cut and raised portion 1b. The spindle 4 is attached to a hole 1c provided in the center of the base portion 1. A disc-shaped holder 6 is axially movable with respect to the spindle 4 via a bearing 5. The bearing 5 and the holder 6 constitute a holding means.

The elastic body 7 is provided to maintain a predetermined position (for example, a magnetic neutral position) when the holder 6 is not vibrating, and has elastic material (rubber, coil spring, leaf spring, air spring). Etc.) and is fixed to the holder 6 or fixed to both the holder 6 and the base portion 1. The elastic body 7 may have the same disk shape as the holder 6 or may be composed of two or more elastic bodies.

The yoke 8 is made of a donut-shaped magnetic material and attached to the holder 6, and has a first bent portion 8a and a second bent portion 8b at opposite positions on the outer peripheral portion. In addition, the first bent portion 8a and the second bent portion 8b respectively include the first cut-and-raised portion 1a (first
Coil 2) and the second cut-and-raised part 1b (second coil 3).
In addition to the metal of the ferromagnetic material, it is also possible to use various materials of the non-magnetic material mixed with the powder of the ferromagnetic material as the material of the magnetic material.

The first magnet 9 has a first bent portion 8
It is provided in the portion facing the first coil 2 on the outer surface of a and is magnetized in the radial direction. The second magnet 10 is the second
It is provided on the outer surface of the bent portion 8b facing the second coil 3 and is magnetized in the radial direction.

Therefore, the first magnet 9 → the first coil 2 → the first cut and raised portion 1a → the base portion 1 → the second cut and raised portion 1b → the second coil 3 → the second magnet 1
A magnetic circuit is formed such that the magnetic flux goes through one round like 0 → yoke → first magnet 9. The state of this magnetic flux is shown by a broken line in FIG.

Next, the operation of the vibration actuator having the above structure will be described. When a current in a predetermined direction is applied to the first coil 2 and the second coil 3, the thrust force is applied to the first coil 2 and the second coil 3 arranged in the above magnetic circuit according to the Fleming's left-hand rule. Occurs. Then, as a reaction of this thrust, the mover (holder 6, yoke 8, first magnet 9, second magnet 10) tries to move.

Therefore, the first coil 2 and the second coil 3
When an alternating current is applied to the mover, the mover generates vibration according to the current waveform. Since the mover has a magnet and has a certain weight, the base 1 side also vibrates in the opposite direction to the mover.

For example, the first coil 2 and the second coil 3
By passing an AC current with an audible frequency of about 3000 Hz, the yoke 8 acts as a diaphragm of the speaker to generate sound. In this case, various sounds can be generated by changing the frequency or the amplitude thereof, or intermittently generating sounds. This allows the pager to make a sound call.

Further, by passing a current having a frequency lower than an audible frequency of about several tens Hz to 100 Hz through the first coil 2 and the second coil 3, the yoke 8, the first magnet 9 and the second magnet 10 are caused to flow. However, since the mover has a certain weight, the base part 1 also vibrates. The vibration of the base portion 1 vibrates the entire pager, and the vibration can be transmitted to the user. Further, this vibration is only the vibration in the direction perpendicular to the base portion 1, and is the vibration in the direction that is easily felt by the user when used for a thin pager, so that it is efficient.

As described above, the pager can call by sound and vibration using a single vibration actuator, and efficient vibration can be generated.

In the above cases, it is possible to generate various sounds and vibrations by changing the frequency and its amplitude, and intermittently generating an electric current. FIG. 4 is a waveform diagram showing the current waveform in this case. 4 (a) to (e)
Shows an example of a current waveform from the signal generator. still,
It is possible to use a known signal generator.
It is also possible to arrange it in an empty space below the base portion 1 in FIG. FIG. 4A shows a current waveform when sound is generated, and a current having a frequency of several hundreds to several thousands Hz is generated intermittently and by changing the amplitude. By supplying the current having such a waveform to the first coil 2 and the second coil 3, it is possible to make a reliable call such that the yoke 8 vibrates and the sound gradually increases.

FIG. 4B shows a current waveform when vibration is generated, and a current having a frequency of several tens to several hundreds Hz is continuously generated. The current having such a waveform is supplied to the first coil 2 and the second coil 3, whereby the base portion 1 vibrates, so that the calling can be performed. Although a sine wave is shown here, various AC waveforms other than this can be used.

FIG. 4C shows a current waveform when vibration is generated, and a current having a frequency of several tens to several hundreds Hz is intermittently generated. By supplying the current having such a waveform to the first coil 2 and the second coil 3, the base portion 1 intermittently vibrates, so that a reliable call can be performed.

FIG. 4D shows a current waveform when vibration is generated, and a current having a low frequency of about several tens Hz is continuously generated. By supplying the current having such a waveform to the first coil 2 and the second coil 3, the base portion 1 slowly vibrates, and a ringing can be performed with a soft vibration at the initial stage of ringing.

FIG. 4E shows a current waveform when vibration is generated, and a current having a low frequency of about several tens to several hundreds Hz is generated intermittently by changing the amplitude. By supplying a current having such a waveform to the first coil 2 and the second coil 3, the base portion 1 vibrates intermittently and gradually increases in amplitude. You can make reliable calls such as small vibrations and large vibrations later.

Although not shown, it is possible to achieve both sound and vibration by superimposing the current waveform of FIG. 4 (a) and the current waveform of FIG. 4 (b) and thereafter. In this way, by making the vibration intermittent, changing the frequency of the vibration, and changing the amplitude (vibration intensity), it is possible to make various changes in the vibration as well as the sound. . Further, it is possible to arbitrarily create various vibrations other than the above by further combining the above current waveforms.

Incidentally, such various vibrations can be switched by the selection of the user and the selection of the control section of the pager. It is also possible to make a configuration such that the caller can arbitrarily select the setting. Although two sets of magnets and coils are provided in the above configuration, other numbers may be used.

Further, by using the elastic body for determining the position of the yoke when the yoke is stationary, the vibration of the yoke can be quickly converged when the AC current is stopped. As the elastic body 7, it is possible to use a means for determining the stationary position of the yoke 8 by magnetic force, for example, instead of a material having elasticity. Thus, by using the stationary position determining means that determines the stationary position and does not hinder the movement, accurate vibration according to the current waveform is realized.

Therefore, according to the above-mentioned structure, thinning: a yoke, a magnet magnetized in a radial direction provided on a bent portion of the yoke end, and provided on the cut-and-raised portion of the base portion so as to correspond to the magnet. Since the yoke is configured to vibrate in the direction perpendicular to the base portion by the magnetic circuit including the coil and the base portion, it is possible to realize a thinner structure as compared with a motor or the like. For this reason, it is suitable for a thin pager, and can call by vibration even for an extremely thin pager that could only call by sound. Moreover, since a single vibration actuator generates both sound and vibration, a dedicated sound generating means (speaker or the like) is not required in the pager, and the size can be reduced.

Long life: Only an alternating current is supplied to the coil, and it is not necessary to use high-speed sliding parts such as a brush and a commutator, and a long life can be realized. Therefore, stable sound and vibration can be generated for a long time,
There is no problem of aging. Further, a DC motor generates electric noise from the brush, but this vibration actuator does not have such a problem.

Efficiency: Since the vibration is generated not in the direction of rotation but in the direction directly felt by the user, the utilization efficiency of the vibration is high. Vibration mode: By selecting the current waveform to be supplied to the coil, it is possible to generate arbitrary frequency, amplitude, and intermittent / continuous vibration. Therefore, it is possible to generate an arbitrary vibration, which was conventionally only vibration on / vibration off, so it is also possible to use a vibration to transmit a message previously decided between the parties. is there.

Although the bearing 5 and the holder 6 constitute the holding means in the above embodiment, the holder 6 is made of a material having a small friction coefficient and is movable in the axial direction with respect to the spindle 4. Therefore, it is possible to use no bearing. Further, it is possible to make a modification in which the holder 6 and the spindle 4 are fixed and the bearing 5 is provided between the spindle 4 and the base portion 1.

FIG. 5 is a sectional view showing the structure of another embodiment of the present invention, and FIG. 6 is a left side view in FIG. In these figures, the same parts as those in the embodiments already described with reference to FIGS. 1 to 3 are designated by the same reference numerals, and the duplicated description will be omitted. In the vibration actuator shown in FIGS. 5 and 6, a shaft 11 is attached to the hole 1c of the base portion 1, and a disk-shaped diaphragm 12 that constitutes an elastic body is provided on the shaft 11. A donut-shaped magnetic yoke 8 is attached to the outer peripheral portion of the diaphragm 12.

That is, in this embodiment, instead of the holding means (bearing 5, holder 6) and the elastic body 7 of the above-mentioned embodiment, the yoke 8 is constructed to be movable in the axial direction by the diaphragm 12. Therefore, the diaphragm 12
Realizes the functions of the holding means and the elastic body of the above-mentioned embodiment.

Also in this embodiment, the first magnet 9 → the first coil 2 → the first cut and raised portion 1a → the base portion 1 → the second cut and raised portion 1b → the second coil 3 → the second coil
The magnetic circuit is formed such that the magnetic flux goes through one round, such as the magnet 10 → the yoke → the first magnet 9.
In this embodiment, the diaphragm 12 is provided to maintain a predetermined position when the yoke 8 is not vibrating, and various elastic substances (rubber, coil spring, leaf spring, air spring, etc.) other than the diaphragm are used. The shaft 11 and the yoke 8 can be held at a predetermined position in a vibrating state, and the vibration can be quickly converged when the current is not supplied. . As a result, accurate vibration according to the current waveform is realized.

Therefore, also in the configurations shown in FIGS. 5 and 6, when a current in a predetermined direction is applied to the first coil 2 and the second coil 3, the first coil disposed in the above magnetic circuit is arranged. Thrust is generated in the second coil 3 and the second coil 3 according to Fleming's left-hand rule. Then, as a reaction of this thrust, the mover (yoke 8, first magnet 9, second magnet 10) tries to move. Therefore, by applying an alternating current to the first coil 2 and the second coil 3,
The mover generates vibration according to the current waveform. It is possible to set arbitrary frequencies and amplitudes for both sound and vibration.

The mover has a magnet,
Since it has a certain amount of weight, vibration in the direction opposite to the mover is also generated on the base portion 1 side. And the base part 1
The vibration of vibrates the entire pager and can transmit the vibration to the user. Further, this vibration is only the vibration in the direction perpendicular to the base portion 1, and is the vibration in the direction that is easily felt by the user when used for a thin pager, so that it is efficient.

In the case of such a configuration, the above
In addition to the effect of (1), the effect that it can be easily configured is added because the bearing and holder are not required. Although the above vibration actuator is suitable for a pager, it can be used for various other applications using vibration. For example, in view of the characteristic that any vibration can be generated, it can be used for an actuator such as a measuring instrument or a vibration canceller.

FIG. 7 is an exploded perspective view showing the entire pager for each main component in an embodiment in which the above-mentioned vibration actuator is arranged in the pager to form a pager calling device.

In FIG. 7, the circuit board 21 on which the circuit parts of the pager and the display portion 21a are mounted is attached to the main body board 22. A battery 23 and the above-mentioned vibration actuator are arranged on the main body substrate 22. The body substrate 22 is configured so as to be integrated with (or also used as) the base portion 1 of the vibration actuator. The main body substrate 22 to which the circuit board 21 is attached is sandwiched between the front cover 24 and the rear cover 25. The front cover 24 has a display 21
A transparent display frame 24a for various displays of a, and a hole 24 for outputting a ringing sound from the vibration actuator to the outside
b and are provided.

As described above, since the calling device is constituted by the single vibration actuator to generate both sound and vibration,
The pager can be downsized. Also, the first
Although a mover composed of the yoke 8, the first magnet 9 and the second magnet 10 vibrates when a current having a frequency lower than an audible frequency of about several tens Hz to 100 Hz is applied to the coil 2 and the second coil 3 of FIG. Since the mover has a certain weight, the body substrate 22 (base portion 1) also vibrates. The vibration of the main body substrate 22 vibrates the entire pager, and the vibration can be transmitted to the user. Further, this vibration is only the vibration in the direction perpendicular to the pager, and is the vibration in the direction that is easily felt by the user when used in a thin pager, and thus has an advantage of good vibration transmission efficiency.

FIG. 8 is a block diagram showing the electrical construction around the pager calling device. In the configuration of FIG. 8, the reception unit 30 receives the radio wave from the center (transmission side), and the control unit 31 demodulates and decodes the transmission content.
Then, the control unit 31 controls the display unit 21a according to the decoding result.
A message is displayed on the screen and a control signal corresponding to the decoding result is given to the signal generator 32. Signal generator 3
2 generates a signal current having a predetermined frequency and cycle as described above in response to a control signal from the control unit 31, and supplies the signal current to the vibration actuator 33.

Since the calling device is constituted by a single vibration actuator in this way to generate both sound and vibration,
This has the advantage that the signal path can be simplified. For example, compared with the conventional case where separate elements are used for sound and vibration, there are also effects such as reducing the programs and ports of the microcomputer.

[0056]

As described above, the coil and magnet of the cut and raised portion, the bent portion of the yoke, the yoke held by the holding means, the bent portion of the yoke, the magnet, the coil of the cut and raised portion, and the flat base portion. In a vibration actuator having a magnetic circuit formed in the path of, when a current is applied to the coil, the yoke and the base part vibrate according to the waveform of the current, the vibration transmission efficiency is high, and vibration of arbitrary frequency and amplitude can be generated. Possible vibration actuator can be realized.

Further, in the vibration actuator in which the yoke is vibrated by the elastic body or the diaphragm, the vibration transmission efficiency is high, it is possible to generate the vibration of any frequency and amplitude, and it is possible to accurately generate the vibration according to the waveform of the current. A vibration actuator capable of generating various vibrations can be realized.

The pager can be miniaturized by constructing the pager calling device using a single vibration actuator. Further, by generating a variable frequency signal and supplying it to the vibration actuator, it is possible to realize a pager calling device having high vibration transmission efficiency and capable of generating vibration of an arbitrary frequency and amplitude.

[Brief description of drawings]

FIG. 1 is a sectional view of a vibration actuator according to an embodiment of the present invention.

FIG. 2 is a left side view of the vibration actuator shown in FIG.

FIG. 3 is a plan view of the vibration actuator shown in FIG.

FIG. 4 is a waveform diagram showing a current waveform supplied to a coil of a vibration actuator.

FIG. 5 is a sectional view of a vibration actuator of another embodiment of the present invention.

6 is a left side view of the vibration actuator shown in FIG.

FIG. 7 is an exploded perspective view showing the entire pager for each main component.

FIG. 8 is a configuration diagram showing an electrical configuration of a pager calling device.

[Explanation of symbols]

1 base part 2 the first coil 3 and the second coil 4 spindle 5 bearing 6 holder 7 elastic body 8 yoke 9 first magnet 10 and the second magnet

Claims (5)

(57) [Claims] 1. A base portion of a flat plate-shaped magnetic body having a plurality of cut and raised portions, a coil wound around each of the plurality of cut and raised portions, and a central portion of the flat plate-shaped base portion. And a plurality of spindles supported by the spindle via a holding means so as to be movable in the axial direction, and arranged to face the cut and raised portions in a space between the plurality of cut and raised portions and the spindle. 2. A vibration actuator comprising: a yoke having a bent portion and a magnet that is provided in a portion facing the coil on an outer surface of the bent portion of the yoke and is magnetized in a radial direction. 2. A base portion of a flat plate-shaped magnetic body having a plurality of cut and raised portions, a coil wound around each of the plurality of cut and raised portions, and a central portion of the flat plate-shaped base portion. A spindle, and a plurality of spindles supported by the spindle so as to be movable in the axial direction via holding means, and arranged so as to face the cut and raised portions in a space between the plurality of cut and raised portions and the spindle. A yoke having a bent portion, a magnet provided in a portion facing the coil on the outer surface of the bent portion of the yoke, and magnetized in the radial direction, between the holding means and the flat base portion. A vibration actuator, comprising: an elastic body that is disposed and that positions the holding means such that the bent portions of the coil and the yoke face each other. 3. A base portion of a flat plate-shaped magnetic body having a plurality of cut-and-raised portions, a coil wound around each of the plurality of cut-and-raised portions, and a central portion of the flat-plate-shaped base portion. And a plurality of shafts that are movably supported by the shafts in the axial direction via holding means and that are arranged so as to face the cut and raised portions in a space between the plurality of cut and raised portions and the spindle. And a magnet provided in a portion facing the coil on the outer surface of the bent portion of the yoke and magnetized in the radial direction, wherein the holding means includes a shaft and the yoke. A vibration actuator, which is an elastic body that is disposed between the coils and positions the yoke so that the bent portions of the coil and the yoke face each other. 4. A base portion of a flat plate-shaped magnetic body having a plurality of cut and raised portions, a coil wound around each of the plurality of cut and raised portions, and supported by a central portion of the flat plate-shaped base portion. And a plurality of spindles supported by the spindle via a holding means so as to be movable in the axial direction, and arranged to face the cut and raised portions in a space between the plurality of cut and raised portions and the spindle. A yoke that has a bent portion and that generates a vibration or an audible sound according to a magnetic field generated by an alternating current supplied to the coil; and a radius provided on an outer surface of the bent portion of the yoke that faces the coil. A pager characterized by using a vibration actuator that has a magnet magnetized in a certain direction and that generates an audible sound or low-frequency vibration in accordance with the supplied AC current. Fine-out equipment. 5. A base portion of a flat plate-shaped magnetic body having a plurality of cut-and-raised portions, a coil wound around each of the plurality of cut-and-raised portions, and a spindle supported by the central portion of the flat-plate-shaped base portion. A plurality of bent portions that are supported by the spindle so as to be movable in the axial direction via holding means and that are arranged to face the cut and raised portions in a space between the plurality of cut and raised portions and the spindle. A yoke that vibrates or produces an audible sound according to a magnetic field generated by an alternating current supplied to the coil, and is provided in a portion facing the coil on an outer surface of a bent portion of the yoke and is magnetized in a radial direction. A vibration actuator that has a magnet and generates audible sound or vibration, and a place that is used to generate audible sound or low frequency vibration used for calling the pager. The generated alternating current having a frequency, a pager for paging system being characterized in that a coil and supplies a signal generator of the ultrasonic actuator.