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JP2000317398

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
financial decisions, should not be based on machine-translation output.
DESCRIPTION JP2000317398
[0001]
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, that is, a vibration actuator for
generating voice and low frequency vibration, and can be used as a vibration actuator for a pager
in order to make it particularly compact and lightweight.
[0002]
2. Description of the Related Art A conventional vibration actuator for a pager, also referred to as
a vibration motor for a pager or a vibration generating actuator, needs to be small, thin, capable
of generating vibration with low power consumption, and inexpensive. 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. Also, the pager vibration motor, which is often used, has a large start-up
power consumption to rotate 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 switching the current is used for the reason of using a direct
current, large electromagnetic noise may be generated, an operation failure may occur during
rotation, and there is a limit to miniaturization and flattening.
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[0003]
FIG. 18 shows a pager vibration motor most commonly used conventionally. The counterweight
63 is rotated via a shaft 62 driven by a drive motor 61 constituted by a cylindrical coreless rotor,
and generates a whirling vibration. Naturally, no sound other than vibration can be generated.
The drive motor 61 is formed by a curved permanent magnet and a cylindrical coreless rotor,
and it is necessary to form a plurality of magnetic poles in order to obtain a rotational drive
force. There is a limit in accuracy control and production cost
[0004]
FIG. 19 shows a vibration state of a cylindrical vibration motor for a pager. The counter weight
63 swings around the center of rotation 64 by the rotation by the drive motor 61. Since the
vibration occurs in all directions, the vibration may not be transmitted to the outside depending
on how the pager vibration motor is fixed, and the swinging moment is proportional to the
square of the rotation speed of the drive motor 61. Because of the need for driving power, there
is a limit to power saving.
[0005]
FIG. 20 is a perspective view showing the inside of a pager vibration motor 65 configured of a
conventional flat coreless rotor. A disk-shaped winding coil 66 with its center of gravity
eccentrically provided is provided on the rotating shaft 68, and a rotational driving force is
generated between the rotating coil 68 and the thin plate-like permanent magnet 67. The drive
current is supplied from the brush 69. Unlike the cylindrical one, in place of the counterweight, a
winding coil 66 with its center of gravity decentered is used to generate vibrations upon rotation.
Of course, I can not play voice. Further, it is difficult to form a flat shape of several mm or less
with an outer diameter of 20 mm or less.
[0006]
FIG. 21 shows the most effective vibrational state of the flat pager vibration motor, and the
rotational state in the axial direction with respect to the vibration center shaft 70 is shown by 71,
72, 73 of the pager vibration motor main body. . There are also thickness vibration in the axial
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direction and vibration with a diameter in the direction perpendicular to the shaft, but depending
on the way of fixing the flat type vibration motor for a pager, it often does not contribute much
to the generation of external vibration. . This means that the drive current applied to the winding
coil is not effectively utilized as vibration energy to the outside.
[0007]
SUMMARY OF THE INVENTION The conventional vibration actuator for a pager can generate
vibration but can not generate sound. In addition, the starting power can not always be reduced,
and it is quite difficult to reduce the external dimensions, and some may be prone to rotational
malfunction and generate large electromagnetic noise.
[0008]
An object of the present invention is to provide a voice and low frequency vibration generating
vibration actuator capable of generating vibration and sound and effectively converting a drive
current into vibration energy, particularly a pager vibration actuator that can also be used as a
receiver. It is an object of the present invention to provide a vibration actuator for generating
voice and low frequency vibration which is easy to manufacture at low cost, small in size, easy to
be flattened, and less in malfunction.
[0009]
SUMMARY OF THE INVENTION In order to achieve the above object, the present invention
comprises a magnetic circuit comprising an annular magnetic gap comprising a permanent
magnet and a yoke, and arranging a coil in the magnetic gap, the coil A vibration actuator
comprising a cover attached to a cover, and an electric vibration transducer attached to the cover
for causing an alternating current electrical signal to flow to the coil to cause relative vibration
between the vibrator and the magnetic circuit, the coil being elastic, Material is fixed to the cover
and elastically supported by the damper to the magnetic circuit by a damper, and the magnetic
circuit is flexibly supported on the cover by a flexible structure, and the AC signal has a
frequency lower than the audio frequency When it is a signal, the relative vibration is transmitted
to the cover, and when the alternating current vibration is a high frequency sound frequency, the
relative vibration causes the vibration body to vibrate to generate sound. A voice and lowfrequency vibration generating vibration actuator, characterized by.
[0010]
The flexible structure may be a locking portion made of an annular soft elastic material attached
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to the cover, and the yoke top of the magnetic circuit is locked to the locking portion.
[0011]
The flexible arrangement may be a tubular rubber extending around the periphery of the
magnetic circuit.
In this case, the yoke top of the magnetic circuit is locked to the support of the cover via the
tubular rubber.
[0012]
The flexible structure may be formed of an annular soft elastic material extending around the
outer circumference of the magnetic circuit.
In that case, the yoke top of the magnetic circuit is locked to the support of the cover via the
annular soft elastic material.
[0013]
As another preferred means, the flexible structure is an annular bellows-like rubber extending
around the outer periphery of a magnetic circuit, and a yoke top of the magnetic circuit is
interposed through the annular bellows-like rubber. It is locked by the support part.
[0014]
In still another preferred example, the flexible structure is made of thin rubber fixed to the cover
while covering the outer surface of the magnetic circuit.
[0015]
DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiments of the present invention
will be described based on examples with reference to the drawings.
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[0016]
FIG. 1 shows an example of an embodiment of a vibration actuator for a pager according to the
present invention, which uses the driving principle of a moving coil type electro-acoustic
transducer that generates sound.
The vibrating body 1 is formed in a dome shape so as to be less likely to be bent at the time of
vibration so as to generate a good sound.
In order to support the central position and the upper and lower positions of the vibrating body
1 and the coil 3, they are bonded to a damper 7 which can be relatively softly displaced in the
vertical direction.
The upper portion of the bobbin 9 is bent at a right angle to the inner side, so that the bonding
between the vibrating body 1 and the damper 7 can be strengthened, and an annular flat portion
8 which is an annular collision portion can be formed.
The annular flat portion 8 and the collision portion 2 are bonded with the elastic member 15
interposed therebetween.
[0017]
In the magnetic circuit, a plate 6 of a disk-shaped magnetic body is adhered to one pole of a
magnet 4 which is a permanent magnet magnetized in the thickness direction with a column
having an opening 13 at the center, and the other pole is molded It is configured by bonding the
yokes 5 of the 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.
[0018]
In the case of voice, the frequency is as high as several hundred hertz to 3 kilohertz, and even if a
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relatively large drive current enters the coil 3, the displacement amount of the vibrator 1 is
relatively small, and the thickness direction change of the bonded soft elastic material 15 It can
correspond by. When driving at a low frequency of several tens of hertz, the displacement of the
vibrating body 1 etc. should be large, but it is due to the instantaneous upward displacement by
the coil 3 that the vibration is generated in the collision part 2 Even when the annular flat
portion 8 is bonded via the soft elastic member 15, the occurrence of vibration is not suppressed.
[0019]
The annular flat portion 8 which is an annular collision portion that collides with the collision
portion 2 is structurally strong and collides on average. The vibration generated by the collision
is transmitted through the support beam 12 and is further propagated from the outer peripheral
portion 10 to the outside. In order not to raise the back pressure of air when the vibrating body 1
and the damper 7 vibrate at a low frequency, it is preferable to provide a central hole 13 in the
plate 6 and a plurality of holes 14 in the yoke 5. The cross sectional structure is shown in FIG.
[0020]
If you want to generate a voice to notify the arrival of the signal or the other party's
conversational sound, realize it with a vibration of several hundred hertz to 3 kilohertz of the
vibrating body 1, and when notifying the incoming signal by a vibration, It drives and transmits
collision vibration with the collision part 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
addition, in order to suppress the generation of sound at the time of collision, and to soften the
impact of the collision and make it difficult to be damaged, it is preferable to bond the collision
portion 2 and the annular flat portion 8 via the elastic member 15.
[0021]
Furthermore, in order to increase the vibration generated outside, as shown in FIG. 3 of a crosssectional view which is an example of the embodiment of the present invention, a magnetic
circuit including yokes 18 other than the coil 20 may collide with the collision cover 27 or It is
effective to increase the collision force at the annular flat portion 23 of the coil 20 by effectively
utilizing the repulsive force with the magnetic circuit. Naturally, the annular flat portion 23 is
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bonded to the collision cover 27 via the elastic member 25.
[0022]
For that purpose, it is necessary to flexibly support the magnetic circuit including the yoke 18 so
that it can be displaced to some extent. In the embodiment of FIG. 3, the support rubber 29
supports the flat portion of the yoke top 28 around the yoke 18 of the magnetic circuit. The
upper thin rubber end 30 adheres to the collision cover 27 and the lower thin rubber end 31
covers under the yoke top 28. Both ends of the upper and lower thin rubbers are formed in an
annular shape, and are connected by a plurality of independent width not large supporting
rubbers 29. The support rubber 29 and the annular thin rubber at the upper and lower ends are
suitably formed by integral molding.
[0023]
FIG. 4 shows a state in which a drive current is supplied to the coil 20 of FIG. 3 which is an
embodiment of the present invention, and the annular flat portion 23 holds down the elastic
member 25 to reduce it. At this time, at the same time, the support rubber supporting the yoke
top 28 extends, and the magnetic circuit consisting of the yoke 18, the magnet 16 and the plate
17 moves downward, and the yoke top 28 is separated from the collision cover 27. This state
indicates the state in which the collision vibration is transmitted to the collision cover 27 or the
state in which the driving current as described below is polarized.
[0024]
FIG. 5 is a perspective view in which the configuration for flexibly supporting the magnetic
circuit including the yoke 18 of the embodiment of the present invention shown in FIG. 3 is
substantially reversed. The end 30 of the annular thin rubber sandwiching the yoke top 28 is
bonded to the collision cover, and the other end 31 of the annular thin rubber has a larger outer
periphery as it approaches the support rubber 29 when the support rubber 29 receives an
extension force. It is displaced in the direction, and as a result, it becomes equivalent to the
support rubber 29 extending greatly. Bonding with the yoke top 28 at an intermediate position
from the plurality of support rubbers 29 at the other end 31 of the annular thin rubber is
effective for positioning. An electrode wire is taken out from the slit 32.
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[0025]
An example in which the drive current has a polarity is shown in FIG. It is advantageous to use an
alternating current of approximately one polarity so that a force is generated in the coil 20 which
mainly drives in the direction of the collision cover 27 in the opposite direction to the magnet 16
of FIG. The direction of this polarity is uniquely determined by the direction of magnetization of
the magnet and the winding of the coil, and the direction of the current is selected, and the
polarity matching the direction of this current is selected. The dashed square wave current 34 in
FIG. 6 is such that the value of B is greater than the value of C, and the polarity in the direction of
B is mainly. The solid square wave current 33 has only one polarity between A and zero.
[0026]
When the drive current has no polarity, the magnetic circuit including the yoke 18 is displaced in
the opposite direction only when a current receiving the drive force in the direction of the
collision cover 27 flows in the coil 20 in the embodiment of FIG. The yoke top 28 as shown in
FIG. As a matter of course, since the coil 20 and the annular flat portion 23 are bonded to the
collision cover 27 via the elastic member 25, they do not separate even if the elastic member 25
is expanded and deformed, and the driving AC current has reverse polarity. If it does, the yoke
top 28 will collide with the collision cover 27 in the process. At this time, it is necessary to
suppress unnecessary noise at the time of a collision. Also, the lower elastic member 26 can be
omitted.
[0027]
When the drive current has a polarity only on one side as shown by the square wave current 33
in FIG. 6 and the current value A is large to some extent, the yoke top 28 is always kept apart
from the collision cover 27. For example, when the value of A in FIG. 6 is set to 200 milliamperes,
when supported by the relatively soft support rubber 29, the magnetic circuit including the yoke
18 keeps floating about 1 mm upward or downward viewed from the collision cover 27 It
vibrates with an amplitude of about 0.1 mm, plus at tens of hertz.
[0028]
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In this case, since the yoke top portion 28 does not collide with the collision cover 27, the elastic
material may be inserted all around or in part, but it is not necessary to take measures against
the unnecessary sound. Also, the relative vibration between the coil 20 and the vibrator 24 and
the magnetic circuit including the yoke 18 is maintained in a stationary state through the
support rubber 29 between the cover 27 and the yoke top 28 Assuming that only the relative
vibration of the coil 20 and the vibrator 24 is transmitted to the collision cover 27 only from the
annular flat portion 23 integrated with the coil 20 via the elastic material 25. That is, relative
vibration between the coil 20 and the vibrator 24 and the magnetic circuit including the yoke 18
is transmitted to the cover 27 via the elastic member 25 and the support rubber 29. When the
square wave current 33 in FIG. 6 rises, the coil 20 is added to the reaction with the magnetic
circuit including the yoke 18 to give a large vibrational force to the collision cover 27 and the
vibration generation level becomes large. Furthermore, when the polarity of the drive current is
all biased and the maximum peak current value is larger, the collision force due to the reaction of
the drive force of the coil 20 and the magnetic circuit is larger, and it is annoyed by measures
against unwanted noise due to the collision of the yoke top 28 Will be reduced.
[0029]
When a drive current having a steep rise is applied to the coil 20 of the embodiment of FIG. 3 as
in the square wave current 33 of only one polarity of FIG. 6, changes due to the rapid drive force
or the reaction force from the magnetic circuit. As a result, momentary mechanical deformation
stress of the vibrating body 24 or the like is large, and an unnecessary sound different from a
collision sound containing many high frequency components is generated at a considerable level.
In the case of the trapezoidal wave, the generation of the unnecessary sound becomes smaller as
the slope portion becomes looser, and becomes lower in the SIN wave and the triangular wave.
However, if the inclination is too loose, the vibration level will be low.
[0030]
The trapezoidal wave is also similar to the waveform in which the rising and falling slopes of the
square wave are mitigated, but in the case of the dashed square wave 35 in FIG. The slope of the
waveform can be relaxed. In the case of the rising curve 36, the unnecessary sound of high
frequency components can be suppressed to a level that causes no problem by merely setting the
time for reaching the saturation level A to be the slope of the curve less than one sixth of one
cycle. Of course, the shape of the falling curve 37 is inverted and similar to the rising curve 36.
By the way, when the frequency was 80 Hz, the unnecessary sound could be ignored at a
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practical level with a time constant of about 1.5 milliseconds. The block diagram of the circuit
configuration may be configured by an integrating circuit 39 and a voltage-current conversion
circuit 40 after the square wave transmission circuit 38 as shown in FIG.
[0031]
In any of the drive current waveforms, as shown in the embodiment of FIG. 3, when the annular
flat portion 23 integrated with the coil 20 is bonded to the collision cover 27 via the elastic
member 25, no bonding is performed. As compared with the case where the annular flat portion
23 is separated from the elastic member 25, the generation level of the unnecessary sound is low
if it is flexible regardless of the material selection of the elastic member 25. As a matter of
course, the vibration generation level is not lowered. The sound has a slight drop in the low
frequency range around several hundreds of hertz, but by making the elastic material 25 flexible,
a low frequency output can be obtained. Sounds of high frequency are rather high. The reason is
that not only the vibrating body 24 but also a part of the collision cover 27 of the resin plate
follow and vibrate.
[0032]
The annular flat portion 23 shown in FIG. 3, which is an embodiment of the present invention, is
adhered to the collision cover 27 via the soft elastic member 25 to drive the coil 20 and the
magnetic circuit including the yoke 18 to some extent. The structure that is flexibly supported by
the flexible structure so as to be displaceable applies a repulsive force to the coil 20 to raise the
level of vibration, ie, the relative between the coil 20 and the oscillator 24 and the magnetic
circuit including the yoke 18 Four other embodiments are shown in FIGS. 9, 10, 11 and 12 to
realize the concept of transmitting the dynamic vibration to the cover 27 through the elastic
member 25 and the flexible structure, and at the same time reducing the unnecessary collision
noise. Is shown below.
[0033]
FIG. 9 is a cross-sectional view of another embodiment, which is supported by the support
portion 42 via the tubular rubber 41 on the back flat portion of the yoke top 28 at the outermost
periphery of the magnetic circuit.
Since the support portion 42 itself is fixed to the collision cover 27, the magnetic circuit
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including the yoke 18 can be relatively flexibly displaced up and down. The support portion may
be in an annular shape and adhered to the collision cover 27.
[0034]
FIG. 10 is a cross-sectional view of another embodiment, which is also pressed by a bellows-like
rubber 44 molded in a bellows-like manner on the back flat portion of the yoke top 28 at the
outermost periphery of the magnetic circuit. To support. As a result, the magnetic circuit
including the yoke 18 can be flexibly displaced up and down.
[0035]
FIG. 11 is a cross-sectional view of another embodiment, in which a tubular soft elastic material
46 is applied to the flat surface on the back surface of the yoke top 28 on the outermost
periphery of the magnetic circuit, and the support 45 also softens the magnetic circuit including
the yoke 18. To support.
[0036]
Although the construction of the other embodiment of FIG. 12 is slightly different, the bottom of
the yoke 18 of the magnetic circuit is held down by the rubber 47 with the rubber 47 and
adhered to the collision cover 27 by the rubber end 48 or 50 with rubber 47.
A magnetic circuit composed of the magnet 16, the plate 17 and the yoke 18 is supported by the
rubber 47 so as to be vertically displaceable.
[0037]
As shown in FIG. 9, FIG. 10 and FIG. 11, when the flat portion of the back surface of the yoke top
28 of the magnetic circuit is supported by the support portion 42 and the support portion 45
with a flexible structure or material, The function can be maintained without breaking the
relatively heavy magnetic circuit or breaking the damper 21 that flexibly supports the coil 20
bonded to the collision cover 27.
[0038]
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In the case of the embodiment shown in FIGS. 3 and 12, although the supporting portion as
described above is not provided in the vicinity from the collision cover 27 to softly support the
magnetic circuit such as rubber, the support rubber 29 of the outermost periphery of the
magnetic circuit Although not shown, if an annular or a plurality of columnar support portions,
which are not illustrated, are provided just outside the rubber 47, durability against particularly
rapid lateral acceleration changes is provided.
[0039]
FIG. 13 is a cross-sectional view of the embodiment of the present invention, but slightly different
from the above embodiments, the yoke top 51 of the outermost periphery of the magnetic circuit
other than the coil 20 is made of elastic material 52 relatively soft in the thickness direction. It is
bonded to the collision cover 27 via the same.
However, the fact that the annular flat portion 23 integrated with the coil 20 is bonded to the
collision cover 27 via the elastic material 25 is the same as all the embodiments of the present
invention.
[0040]
When a drive current having a polarity on one side as shown in FIG. 7 is applied to the coil 20 of
FIG. 13 and a drive force in the direction of the collision cover 27 is generated, as shown in the
cross sectional view of FIG. The damper 21 supporting the bobbin 23 and the coil 19 is displaced
from the horizontal direction, and the elastic member 25 is compressed and deformed.
The elastic member 52 expands and deforms because the magnetic circuit including the yoke 18
moves away from the collision cover 27. As described above, when the polarity is mainly on one
side and the peak value of the current is large, it is equivalent to the application of a direct
current bias current. It is displaced at the drive frequency centering on the equilibrium state. The
driving force of the coil 20 and the reaction from the magnetic circuit cause vibration generation
due to the collision of the coil 20 against the collision cover 27 via the elastic material 25.
[0041]
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In all the inventive embodiments, for example, the damper 7 was used in FIG. 1, and the damper
21 was used in FIGS. 3, 9, 10, 11, 12 and 13. In particular, the purpose of the structure such as
the damper 21 is to position the coil 20 and the vibrating body 24 in the center direction and the
vertical direction with respect to the magnetic circuit, but further stiffer in the center direction
while having softness of displacement in the vertical direction. It was intended to support.
Therefore, as shown in FIG. 16 which is a perspective view of the actuator used in the present
invention in which the vibrator is not bonded, the damper 21 is formed of a resin material and
has a narrow width of about 1 mm and a thin thickness of about 0.2 mm. In multiple spirals. At
this time, the entire diameter can be reduced by providing the coil 20 on the inner side. Further,
it is preferable to form the annular flat portion 23 for fixing the coil 20 by bonding or the like
and the damper 21 by integral molding of resin. When the bobbin 19 is provided, this bobbin 19
may be formed together with the damper 21. The damper 21 is positioned by the damper
support 22 by the holes of the magnet 16 and the plate 17.
[0042]
In the embodiment of the present invention shown in FIG. 15, a damper for supporting and
positioning the coil 53, the annular flat portion 54 and the bobbin 55 is not used. The vibration
body 56, the annular flat portion 54, and the bobbin 55 integrally formed are bonded to the
collision cover 27 via the elastic member 25 and positioned, and the magnetic circuit including
the yoke 18 is interposed at the yoke top 51 via the elastic member 52. When the adhesive cover
27 is bonded and positioned, the dampers do not need to be particularly centered on each other
or positioned vertically. This is because the magnetic circuit composed of the coil 53, the magnet
16 and the plate 17 exchanges forces with each other through space. The configuration without
the damper is also possible in the embodiments of FIGS. 3, 9, 10, 11 and 12.
[0043]
As shown in FIG. 16, a plurality of thin magnetic material plates are stacked on the yoke 57, and
a plurality of slits 58 are provided, and pressure molding is performed to form an annular
vertical wall facing the plate 17 with high precision. It will be easier to do. Although not shown,
most of the bottom of the yoke 57 through which magnetic flux flows and the number of annular
side portions are increased, and the number of the yoke tops 59 is reduced so that the purpose
as a magnetic circuit is not sacrificed. The overall weight can be reduced.
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[0044]
By the way, in order to enlarge the vibration and to suppress the generation of unnecessary noise
at the time of collision, as in the present invention, it is adhered to the colliding portion via the
elastic material to the colliding portion to support the yoke of the magnetic circuit flexibly. In
contrast to the method described above, examples of transient steps leading to the present
invention are shown. As shown in FIG. 17, when the annular flat portion 23 is not bonded to the
elastic member 60 and the magnetic circuit including the magnet 16, the plate 17 and the yoke
18 is fixed by the collision cover 27 by the support portion 26, I struggle with the suppression of
unwanted sounds. In particular, there is a problem in selecting the elastic member 60 and
maintaining its long-term reliability. And since the force by reaction of the coil 20 due to the
elastic energy storage by the flexible support structure due to the displacement of the magnetic
circuit including the yoke 18 can not be expected, as a result, the annular flat portion 23
integrated with the coil 20 It should be added that the vibration caused by the collision with the
collision cover 27 via the elastic material does not increase so much.
[0045]
Since the present invention is configured as described above, the following effects can be
obtained.
[0046]
Since the coil attached with the diaphragm is bonded to the cover via the elastic material, the
unnecessary sound at the time of collision can be suppressed relatively easily.
Not only can the unwanted sound level of the present invention be lowered, but the high
frequency components of the conventional pager vibration motor have less sound.
[0047]
Furthermore, by flexibly supporting the magnetic circuit with rubber or the like on the cover so
that the magnetic circuit such as the yoke can move relatively easily in the vertical direction,
elastic energy accumulated in rubber or the like is applied to the coil to exert a reaction force. ,
Can generate a large vibration.
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[0048]
It is consistent with the fact that the drive current has polarity and the coil is pushed in the
collision direction and always in close contact with the elastic material, which is consistent with
the fact that it adheres to the elastic material. There is almost no
Further, by supplying a drive current having a polarity to the coil, the magnetic circuit composed
of a yoke, a magnet, etc. flexibly supported on the cover by its repulsive force is maintained in a
state separated from the cover, and the frequency and current of the drive current The
movement of the amplitude determined by the value and the reaction force applied to the coil at
the rise time of the drive current can generate large vibration of the coil.
[0049]
As a result, a large vibration can be generated compared to the conventional pager vibration
motor. In addition, since the vibration noise does not include high frequency vibration associated
with sliding, and the frequency of the drive current that can be freely selected is low and single, it
is possible to select a frequency that can be easily recognized by bodily sensation. However, it is
more reliable to avoid the vicinity of the resonance frequency.
[0050]
At the time of this drive current, the magnetic circuit hardly collides with the cover, so there is no
difficulty in selecting an elastic material to suppress unnecessary noise generated at the time of
collision and ensuring thickness and material reliability, and external acceleration is large. It is
only necessary to simplify measures when changing or not driving.
[0051]
As a result of the above, according to the present invention, both the coil and the yoke move in
the vertical direction only, vibration energy can be effectively transmitted, and vibration energy
can be effectively extracted.
In addition, since the starting power is relatively small, power consumption can be reduced.
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[0052]
Further, as a matter of course, the drive current is an alternating current, and no electromagnetic
noise is generated since it is not necessary to switch contacts as in a conventional direct current
driven pager vibration motor. This does not require a noise filter in the cell phone and does not
induce malfunction in external devices.
[0053]
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 can be reduced despite the large driving force. In
addition, the thickness is about 6 mm, and there is a high possibility of being acceptable as a
thickness in the case of using both vibration generation and speech production.
[0054]
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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