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BACKGROUND OF THE INVENTION The present invention is designed to output low-frequency
vibration to an electro-acoustic transducer which is built in a portable telephone or the like and
emits voice for calling upon signal incoming, so that calling can also be performed by vibration. It
is an electric vibration converter used to make it known, and can be used particularly for the
purpose of making it small and light.
2. Description of the Related Art A vibration actuator for a pager as this type of electric vibration
converter of the prior art is also referred to as a vibration motor or vibration generating actuator
for a pager, is small and thin, can generate vibration with low power consumption, and is
inexpensive. It is necessary. However, in order to generate only vibration, it is of course not
possible to make a voice call or to make a speech sound. Therefore, at least two or more device
parts are required for incoming call information and voice generation.
Moreover, the vibration actuator for pagers used frequently has a large start-up power
consumption because it rotates a relatively large mass. Furthermore, the number of parts
increases due to the configuration to be rotated, and there are problems with reliability and
accuracy management. Since a brush for current switching is used for the reason of using a
direct current, operation failure may occur during rotation, and there is a limit to miniaturization
and flattening.
FIG. 11 shows a vibration motor for a pager that is conventionally and most commonly used. The
counterweight 48 is rotated via a shaft 47 driven by a drive motor 46 constituted by a cylindrical
coreless rotor to generate whirling vibration. The drive motor 46 is formed of a curved
permanent magnet or a cylindrical coreless rotor, and it is necessary to form a plurality of
magnetic poles in order to obtain a rotational drive force, and in order to realize the thin
diameter drive motor 46 There is a limit in management and production cost. Furthermore, since
the direction of the vibration mode is omnidirectional, there is a limit to effectively use the drive
current applied to the coreless rotor as vibration energy propagation to the outside.
FIG. 12 is a perspective view showing the inside of another conventional pager vibration motor
49 configured of a flat coreless rotor. A coil 50 of a disk-shaped winding whose center of gravity
is eccentrically provided on the rotation shaft 51 is provided to generate a rotational driving
force with the thin plate-like magnet 52. The drive current is supplied from the brush 53. Unlike
the cylindrical type, in place of the counterweight, a winding coil 50 having an eccentric center
of gravity is used. Vibration occurs during rotation. It is difficult to form a flat shape of several
mm or less with an outer diameter of 20 mm or less. And since this also takes an omnidirectional
vibration mode, there is also a limit that can effectively use the drive current for vibration energy.
Although the conventional vibration actuator for a pager can generate vibration, it can not
generate sound and the efficiency of converting it into external vibration energy is not
necessarily good. Also, the starting power can not always be reduced, and it is quite difficult to
reduce the external dimensions. There is also a limit to low cost, and there are also cases where
rotational malfunction is likely to occur.
An object of the present invention is to obtain an electric vibration converter capable of
generating vibration and sound and effectively converting driving current into vibration energy,
particularly a vibration actuator for a pager. It is an object of the present invention to provide a
pager vibration actuator which is easy to operate and has few malfunctions.
SUMMARY OF THE INVENTION In order to achieve the above object, an electric vibration
converter used as a vibration actuator for a pager according to the present invention comprises a
magnetic circuit having an annular magnetic gap with a permanent magnet and a yoke. An
electric vibration converter in which a coil is disposed in the magnetic gap, a vibrator is attached
to the coil, and an alternating current electrical signal is supplied to the coil to cause relative
vibration between the vibrator and the magnetic circuit; The vibrator is elastically supported by
the yoke on the magnetic circuit through a damper, and when the AC electrical signal is a high
frequency audio signal, the oscillator vibrates and generates sound, and the AC electrical signal is
an audio signal. When the low frequency signal is lower than the frequency, the relative vibration
is transmitted to the outside of the yoke, and the damper is in a spiral shape.
The spiral damper may be disposed inside the coil and be fixed to an inner portion of the annular
magnetic gap of the magnetic circuit.
Further, the yoke portion has a large diameter portion having an inner diameter larger than the
diameter of the annular magnetic gap, and a central portion of the spiral damper is fixed to the
vibrator, and the spiral damper is outside the coil. Preferably, the spiral damper is disposed and
the outer diameter portion of the spiral damper is fixed to the large diameter portion of the
magnetic circuit.
By attaching the yoke of the electric vibration converter to the case of a mobile communication
device via an elastic body, the vibrator vibrates to generate sound when the AC signal is a high
frequency audio signal, and the AC electric signal is generated. An audio and vibration actuator
can be obtained, characterized in that the relative vibration is transmitted from the yoke to the
case when the low frequency signal is lower than the audio frequency.
DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiments of the present invention
will be described based on examples with reference to the drawings.
FIG. 1 shows an embodiment of a vibration actuator for a pager according to the present
invention, which uses the driving principle of a moving coil type electroacoustic transducer that
generates sound.
The vibrator 1 is bonded to the annular flat portion 8, and the damper 7 is formed by integral
molding of the annular flat portion 8, the bobbin 9, and the resin.
The damper 7 supports the central position of the vibrating body 1 and the bobbin 9, has a
configuration that can be softly displaced in the vertical direction, and is supported by the
damper support portion 10.
The damper support portion 10 is fixed to the hole 13 at the center of the plate 6 in a cylindrical
configuration having a step.
Further, a cylindrical coil 3 in which a conductor fine wire is wound a plurality of times is formed
on the outer periphery of the bobbin 9.
The structural strength can be increased by having the bobbin 9 and being integrally formed of
the annular flat portion 8 and the resin.
In the magnetic circuit, a plate 6 of a disk-shaped magnetic body having a hole 13 at its center is
bonded to one pole of a permanent magnet 4 magnetized in a columnar thickness direction, and
the other pole is formed and processed. It is configured by bonding a yoke 5 of a magnetic plate.
An annular gap in which the coil 3 and the bobbin 9 move up and down is formed between the
yoke 5 and the plate 6 to form a space having a large magnetic flux density.
The vibrating body 1 is supported by the damper 7 at a position slightly separated from the
collision cover 2 and when driven at a relatively low frequency, the displacement of the vibrating
body 1 becomes large and collides with the collision cover 2.
The annular flat portion 8 colliding with the collision cover 2 is structurally strong and collides
on average.
The vibration generated by the collision propagates to the outside. A hole 13 is provided at the
center of the magnetic circuit so as not to increase the back pressure of air when the vibrator 1
and the damper 7 vibrate at a low frequency. The cross sectional structure is shown in FIG.
When the incoming signal is notified by vibration, it is driven at a low frequency of several
hundreds of hertz or less to transmit the collision vibration between the annular flat portion 8
and the collision cover 2 to the outside. The vibration direction at this time is only the vertical
direction, and vibration energy can be efficiently taken out to the outside.
In order to increase the amplitude of vibration at low frequencies and not to reduce the driving
force, the damper 7 needs to be configured to have large compliance in the vertical direction.
FIG. 9 shows a pager vibration actuator using a damper 36 of a conventional configuration.
The damper 36 supporting the vibrating body 35, the bobbin 38 and the coil 39 is fixed by the
support base 37. The conventional damper 36 is formed in a wave-like shape and impregnated
with a phenolic resin or the like to have relatively large compliance with minute vibrations so
that the center position can be formed.
Even if the vibration body 35 and the bobbin 38 are driven by the current supplied to the coil 39
so as to largely fluctuate, the damper 36 does not have large compliance and thus the speed at
the time of collision with the elastic members 44 and 45 is not large. It also happens that there is
no collision or collision, so the vibration can not be taken large.
The conventional damper 36 has a limit in compliance because the tension in the circumferential
direction of the damper 36 increases when the damper 36 moves up and down, and a large
reaction occurs when moving up and down.
FIG. 3 is a perspective view of the configuration excluding the vibrator 1 of FIG. 1, and the
damper 7 is formed in a spiral thin plate shape having a plurality of narrow widths continuously
from the annular flat portion 8 to the inside. It is coupled to the damper support 10.
Since the spiral damper 7 can be made long, it is possible to cope with displacement in the
vertical direction, to be soft and to cope with it, and to have a narrow width of 1 mm or more, so
that the rigidity in the width direction is large. The deviation from the center of the bobbin 8 or
the bobbin 9 can be made small.
As shown in FIG. 1, when the damper 7 is formed inside the annular flat portion 8, it is difficult to
integrally form the damper 7 and the vibrator 1.
Therefore, it is necessary to form the vibrating body 1 as a separate piece like a dome and to
bond it to the annular flat portion 8.
In order to significantly reduce the collision noise generated when hard objects collide with each
other, the annular elastic members 11 and 12 are bonded to the fixed collision cover 2 in which
the annular flat portion collides, and to the plate 6. Do.
When urethane foam is used as the elastic material, the collision noise becomes very small.
In order to make the thickness about half of 1 mm, it may be formed by thermoforming.
In order to effectively propagate the vibration due to the collision to the outside, it is effective to
cause the annular flat portion 8 to directly collide with the case 16 of the mobile communication
device via the elastic member 11, as shown in the sectional view of FIG. .
Furthermore, in order to increase the vibration of the case 16, it is preferable that the yoke 14 be
supported by the claw 17 directly coupled to the case 16 via the elastic spacer 15 without
adhering the whole vibration actuator for the pager to the case 16.
It is stabilized when the yoke 14 is adhered at the part of the claws 17.
In consideration of the difficulty of the mold and the fact that the case 16 does not hate that the
hole is carelessly formed in the case 16 by integrally molding the nail 17 in the case 16, the resin
portion with the nail 17 is inside the case 16 It may be configured to be fitted.
Also, the elastic spacer 15 interposed between the yoke 14 and the case 16 may be the same
continuously as the elastic material 11 for reducing the collision noise at the time of collision.
The cross-sectional view of FIG. 5 also shows a method of effectively extracting energy at the
time of collision as vibration.
By shifting the position of the bonding portion 21 and the portion where the annular flat portion
8 collides, the vibration can be made large.
In addition, in order to prevent the extraction electrode wire 19 from the coil 3 from disturbing
the vibration of the bobbin 9, a slit-like yoke notch is formed at two places in the opposite
direction of the side face of the yoke 18 up to near the bottom of the yoke 18 20 is provided, and
the lead-out electrode wire 19 is taken out.
If the lead-out electrode wire 19 has a margin of about a half turn under the bobbin until it
comes out to the yoke notch 20, it can respond flexibly to the vibration of the bobbin.
FIG. 6 shows another embodiment of the present invention, which is a pager vibration actuator in
the case where the damper 27 is provided outside the annular flat portion 28. As shown in FIG.
The damper 27 is connected to and fixed to the damper support 29 on the outside.
The annular flat portion 28 and the bobbin 30 as well as the vibrating body 22 can be formed
inside the damper 27, and the damper support portion 29 can be formed integrally with resin on
the outside. This is an advantage different from the case of FIG. As a disadvantage, the outer
diameter may be increased, and when emphasis is placed on reducing the outer diameter, there is
a limit that the length of the spiral damper 27 can be increased.
FIG. 8 is a perspective view excluding the collision cover 33 of FIG. 6, and as a result of adding
the widths of the damper 27, the slit 34 and the damper support 29 to the size of the outer
diameter, the tip of the present invention of FIG. It is understood that the outer diameter is
necessarily larger than that of the embodiment of. However, as described above, the advantage
that all vibrating parts except the coil 23 can be formed by integral molding of resin is great.
Since the present invention is configured as described above, the following effects can be
The vibrator is easy to move in the vertical direction, and most of the driving force can be
directly converted to kinetic energy, so that vibration energy can be effectively transmitted and
vibration energy can be effectively extracted.
In addition, since the starting power is also relatively small, power consumption can be reduced.
Furthermore, since the damper, the bobbin, and the annular flat portion can be formed as a
continuous structure by integral molding of resin or the like and the structural strength can be
increased, the cost can be reduced and accuracy and reliability can be easily ensured.
Further, in the case of the present invention in which the damper is disposed inside, the diameter
of the drive coil is large, and the outer diameter size can be made small for the large driving
In addition, the thickness is about 6 mm, and there is a high possibility that the thickness can be
allowed when using both the function of generating vibration and the function of generating
Furthermore, the assembling operation and the accuracy control are simplified, and there is no
rotating part as in the prior art, so there is no brush or bearing part, and the total number of
parts can be reduced. Also, there is no disadvantage that the position of the electrical contact
does not cause the start of rotation.
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