JP2000325881

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DESCRIPTION JP2000325881
[0001]
BACKGROUND OF THE INVENTION The present invention relates to an electroacoustic
transducer which is built in a portable telephone or the like and emits voice for calling or
receiving at the time of an incoming call so that low frequency vibration can be output, and it is
also called by vibration. Can be used as a vibration actuator for a pager, that is, a vibration
actuator for generating voice and low frequency vibration, in particular, for the purpose of
reducing the size and weight.
[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 current switching brush is used for the reason of using a direct current, a
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. 24 shows a pager vibration motor that is most commonly used conventionally. The
counterweight 123 is rotated via a shaft 122 driven by a drive motor 121 composed of a
cylindrical coreless rotor, and generates a whirling vibration. Naturally, no sound other than
vibration can be generated. The drive motor 121 is formed of 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. 25 shows the vibration state of the cylindrical vibration motor for a pager. The counter
weight 123 swings around the rotation center 124 by the rotation by the drive motor 121. Since
the direction of vibration occurs in any direction, depending on the method of fixing the pager
vibration motor, there is a direction in which the vibration is not effectively transmitted to the
outside, and the swinging moment is proportional to the square of the rotation speed of the drive
motor 121 Because of the need for driving power, there is a limit to power saving.
[0005]
FIG. 26 is a perspective view showing the inside of a pager vibration motor 125 configured of a
conventional flat coreless rotor. A disk-shaped winding coil 126 whose center of gravity is
eccentrically provided on the rotation shaft 128 is provided to generate a rotational driving force
with the thin plate permanent magnet 127. The drive current is supplied from the brush 129.
Unlike the cylindrical one, in place of the counterweight, a winding coil 126 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. 27 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 130 is shown by
131, 132, 133 of the pager vibration motor main body. . There are also thickness vibration in the
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axial 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]
The present invention aims to obtain a vibration actuator for generating a voice and low
frequency vibration, particularly a vibration actuator for a pager, which can generate vibration
and sound and can effectively convert driving current to vibration energy, and is easy to make at
low cost. It is an object of the present invention to provide a vibration actuator for a pager which
is compact, easy to flatten, 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 an electric vibration converter attached to the cover, the electric vibration transducer
causing the coil and the magnetic circuit to vibrate relative to each other by attaching an AC
electric signal to the cover, the coil attached to the cover and the damper to the magnetic circuit
It is elastically supported, the magnetic circuit is flexibly supported by the cover in a flexible
structure, and the relative vibration is transmitted to the cover when the alternating current is a
signal having a frequency lower than an audio frequency. A voice and low frequency vibration
characterized in that the cover vibrates due to the relative vibration to emit a sound when the
alternating current is a high frequency sound frequency. It is generating vibration actuator.
[0010]
The flexible structure is a locking portion made of an annular soft elastic material attached to the
cover, and the yoke top portion of the magnetic circuit is locked to the locking portion.
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[0011]
The locking portion may be a structure in which flat portions around the periphery of the yoke
are vertically sandwiched by thin rubbers, and the upper and lower thin rubbers are continuously
supported by a plurality of rubbers.
[0012]
In addition, it is possible to make the upper and lower thin rubbers into an annular shape.
[0013]
Another example of the flexible structure is a tubular rubber extending around the outer
periphery of a magnetic circuit, and the yoke top of the magnetic circuit is locked to the support
of the cover via the tubular rubber.
[0014]
Still another example of the flexible structure is an annular foamed elastic material extending
around the outer periphery of a magnetic circuit, and the yoke top of the magnetic circuit is
interposed via the annular foamed elastic material. Lock on the support of the cover.
[0015]
Another example of 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 supported by the
cover via the annular bellows-like rubber. Lock to the part.
[0016]
Another example of the flexible structure may be a thin rubber fixed to the cover while covering
the outer surface of the magnetic circuit.
[0017]
In this case, an annular resin molded material having a plurality of claw-like projections outside
the outer diameter of the yoke of the magnetic circuit is adhered to the cover, and the thin
rubber supporting the bottom of the yoke is used as the claw-like projections. Hang up.
[0018]
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Alternatively, an annular resin molded material having a plurality of claw-like projections outside
the outer diameter of the yoke of the magnetic circuit is adhered to the cover, and the yoke is
provided with a slit, and the hook protruding from the slit to the outside of the yoke is used. An
annular ring is adhered to the bottom of the magnetic circuit, and rubber is applied to the claws
and the hooks to support the magnetic circuit.
[0019]
The coil may be provided with an annular flat portion having a diameter close to that of the coil,
and the annular flat portion may be fixed to the cover.
[0020]
The portion of the cover to which the toroidal flat portion is fixed may be a plate portion not
having a hole for sound emission.
[0021]
The damper may be a spiral damper provided inside the annular flat portion.
[0022]
At this time, the annular flat portion and the spiral damper can be formed by resin integral
molding.
[0023]
The damper on the inner side of the annular flat portion can be inclined to form a central portion
higher from the upper surface of the magnetic circuit, and can be inserted into a circular hole of
a plate adhered to the upper surface of the magnetic circuit to be adhesively fixed.
[0024]
The alternating current applied to the coil to cause relative vibration between the magnetic
circuit and the coil is polarized when a force that drives the coil in the direction of the cover acts
on the coil It is good to make it an alternating current mainly made of
[0025]
Further, the alternating current can be an alternating current in which the slope of the rising and
falling of the square wave is relaxed.
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[0026]
In order to obtain the AC waveform, an integration circuit is provided after the square wave
transmission circuit, and a voltage-current conversion circuit for current driving is connected.
[0027]
A yoke of the magnetic circuit is formed by stacking a plurality of thin magnetic plates and pressforming it to have a relatively deep and vertical circumferential inner wall surface.
[0028]
The voice and low frequency vibration generating actuator according to the present invention
described above can be conveniently used as a pager vibration actuator by using the cover as a
casing of a portable telephone.
[0029]
BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will
be described with reference to the drawings, in which a vibration actuator for a pager having a
telephone case as a cover is described.
[0030]
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.
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 is formed.
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The annular flat portion 8 and the projection 2 of the cover 12 are directly bonded by an
adhesive or an adhesive sheet.
The projection 2 constitutes an annular projection integrated with the cover 12 and fixed as a
whole.
[0031]
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.
[0032]
In the case of voice, the frequency is as high as several hundred hertz to 3 kilohertz, and even if a
relatively large drive current enters coil 3, the amount of displacement of vibrator 1 is relatively
small, and depending on the softness of the adhesive layer it is dome-shaped The main body of
the vibrator 1 and the cover 12 integrated with the protrusion 2 bonded thereto are
subordinately displaced up and down according to the driving force of the coil 3, or both of
which drive the same displacement of vibration. Perform in the vicinity of 3.
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 caused in the projection 2 Even if the annular flat portion 8 is directly bonded,
the occurrence of vibration is not suppressed.
[0033]
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The annular flat portion 8 which is scraped to the projection 2 via the adhesive layer is
structurally strong and vibrates on average.
This vibration is transmitted through the cover 12 and further propagated to the outside.
Preferably, the yoke 5 is provided with a hole 14 and the cover 12 is provided with a plurality of
holes 15.
A cross-sectional view of the embodiment of the invention of FIG. 1 is shown in FIG.
[0034]
In the case of generating a voice notifying the arrival of a signal or the conversational sound of
the other party, it is realized by the vibration of several hundred hertz to 3 kilohertz of the
vibrator 1 and the cover 12 and in the case of vibrating the incoming signal by vibration The
body 1 is driven to transmit the vibration with the directly adhered protrusion 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.
Since the projection 2 and the annular flat portion 8 are directly fixed by an adhesive or an
adhesive sheet, no collision noise is generated due to the two colliding with each other.
[0035]
Furthermore, as shown in FIG. 3 of a cross-sectional view which is an example of the embodiment
of the present invention, the magnetic circuit including the yoke 18 other than the coil 20 is
made to collide with the cover 26 or It is effective to increase the pressing force between the
annular flat portion 23 and the projection of the coil 20 by effectively making use of the
repulsive force with the circuit.
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As a matter of course, the annular flat portion 23 is directly adhered by the projection 25
integrated with the cover 26 and an adhesive or an adhesive sheet.
[0036]
For that purpose, the magnetic circuit including the yoke 18 needs to be flexibly supported 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.
It adheres to the cover 26 at one end 30 of the upper thin rubber and covers under the yoke top
28 at the other end 31 of the lower thin rubber.
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.
[0037]
FIG. 6 is a perspective view of the configuration for flexibly supporting the magnetic circuit
including the yoke 18 of the actuator used in the embodiment of the present invention shown in
FIG.
When one end 30 of the annular thin rubber sandwiching the yoke top 28 is bonded to the
cover, and the other end 31 of the annular thin rubber receives the stretching force of the
support rubber 29, the portion closer to the support rubber 29 is larger in the outer
circumferential direction As a result, it becomes equivalent to that the support rubber 29 is
greatly extended.
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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.
[0038]
FIG. 5 shows an actuator which is a drive unit including the magnetic circuit and the coil 20 used
in FIG. 3 of the embodiment of the present invention.
The bobbin 19, the coil 20 and the annular flat portion 23 are supported by the damper 21 so as
to be rigidly displaced in the center direction and softly in the vertical direction, and the position
is fixed by the damper support portion 22 at the center of the magnetic circuit.
[0039]
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, the annular flat portion 23 presses the projection 25, and
the magnetic circuit is displaced downward by its reaction.
At this time, the support rubber 29 supporting the yoke top 28 is extended, 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 cover 26.
This state indicates the state in which the vibration of the coil 20 is transmitted to the cover 26
or the state in which the drive current has a polarity as described below.
[0040]
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When the drive current is polarized, it is effective to use an alternating current of substantially
one polarity so that a force is generated in the coil 20 mainly for driving in the direction opposite
to the magnet 16 of FIG. The direction of this polarity is uniquely determined by the direction of
the current depending on the magnetization direction of the magnet 16 and the winding method
of the coil 20, and the polarity matching the direction of the current is selected. The dashed
square wave current 34 in FIG. 7 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.
[0041]
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 cover
26 flows in the coil 20 in the embodiment of FIG. The yoke top 28 as shown in FIG. As a matter
of course, the coil 20 and the annular flat portion 23 are directly adhered to the protrusion 25
with an adhesive or an adhesive sheet, so that they do not separate from each other, and when
the drive AC current becomes reverse polarity, The yoke top 28 will collide with the cover 26. At
this time, it is necessary to suppress unnecessary noise at the time of a collision.
[0042]
When the drive current has a polarity only on one side as shown by the solid square wave
current 33 in FIG. 7 and the current value A is large to some extent, the yoke top 28 is always
separated from the cover 26 as in FIG. Maintained. For example, when the value of A in FIG. 7 is
200 milliamperes, when supported by the relatively soft support rubber 29 in FIG. 4, the
magnetic circuit including the yoke 18 floats about 1 mm upward or downward viewed from the
cover 26 It vibrates at an amplitude of about 0.1 mm, plus and minus several tens of hertz, as it
is maintained.
[0043]
In this case, since the yoke top portion 28 does not collide with the cover 26, the elastic material
may be inserted all around or in part, but it is not necessary to take measures against
unnecessary noise. Further, relative vibration between the coil and the magnetic circuit is
transmitted from the projection 25 to the cover 26 from the annular flat portion 23 integrated
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with the coil 20 through the adhesive layer. At the time of rising of the square wave current 33
of FIG. 7, the reaction with the magnetic circuit including the yoke 18 is added to the coil 20 to
give a large displacement to the projection 25 and the vibration generation level becomes large.
Furthermore, if the polarity of the drive current is all biased and the maximum peak current
value is large, the relative vibration due to the reaction with the drive force of the coil 20 and the
magnetic circuit is large, and it is bothered by measures against unwanted noise due to collision
of the yoke top 28 Things will be less.
[0044]
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 shown in FIG. 7, the change 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. Even
in the case of the vibrating body in which the majority of the dome portion of the vibrating body
24 is removed, this phenomenon has a merit that the level of the unnecessary sound is slightly
lowered, but the same result is obtained.
[0045]
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 almost no problem by merely
setting the time until the saturation level A is reached to the slope of the curve of 1⁄6 or less 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
practical level with a time constant of about 1.5 milliseconds. As shown in FIG. 9, the block
diagram of the circuit configuration may be configured by the integration circuit 39 and the
voltage-current conversion circuit 40 after the square wave transmission circuit 38.
[0046]
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In any drive current waveform, as shown in the embodiment of FIG. 3, if the annular flat portion
23 integrated with the coil 20 is directly bonded to the projection 25 through the adhesive layer,
bonding is performed. As compared with the case where the annular flat portion 23 may be
separated from the protrusion 25, the generation level of the unnecessary collision noise at the
time of vibration is extremely low. As a matter of course, the vibration generation level is not
lowered. The voice has some reduction in low frequencies around several hundred hertz, but by
making the cover 26 relatively thin, low frequency output is also possible. Sounds of high
frequency are rather high. The reason is that not only the vibrator 24 but also a part of the cover
26 of the resin plate vibrates.
[0047]
Another embodiment of the present invention will be described in which the above-mentioned
case is further clarified. As shown in the sectional views of FIGS. 10 and 11, the vibrator 1 and
the vibrator 24 shown in the embodiment of FIGS. The dome-shaped portion of the cover 12 is
removed, and the sound emission holes 15 and 27 in the cover 12 and the cover 26 are
eliminated.
[0048]
In FIG. 10, the vibrating body 41 has no dome-shaped portion.
However, it is integrally formed with the bobbin 45, the coil 46 and the annular flat portion 44, is
supported by the flexible damper 42 in the vertical displacement, and is fixed in position by the
damper support portion 43. A drive current is supplied to the coil 46, and the cover 47 vibrates
via the projection 48 bonded to the annular flat portion 44, and the displacement is relatively
small in the case of voice with a frequency of several hundred to several kilohertz. Although the
cover 47 has a relatively large area even if it vibrates, the sound level becomes quite large. It is
needless to say that the vibration due to the low frequency can be increased by flexibly
supporting the magnetic circuit including the yoke 18. By sealing the cover 47 without providing
a plurality of holes, it also plays a role of waterproof and dustproof.
[0049]
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FIG. 11 shows an embodiment of the present invention for the same purpose, but by providing an
annular thin portion 51 near the projection 50 of the cover 49 formed of resin or the like to
facilitate displacement, It is also possible to make the voice generation level higher. Even if the
diameter of the thin portion 51 is made larger, it is also possible to generate a larger sound.
[0050]
When the vibration actuator for a pager of the present invention shown in FIG. 10 is mounted on
the inside of the housing position 52 as shown in FIG. 12, it is natural that the housing vibrates
largely at the housing position 52. Depending on the design and drive frequency, the vibration
level may be larger at the housing position 54 and the housing position 55 than at the near
housing position 53. However, since the part that emits the sound is not fixed to a part of the
housing and is not limited to one surface from the relatively wide housing surface, the sound
level is also relatively large, and the part of the housing position 52 is It becomes easy to hear
the incoming call voice even if it is closely attached by clothes or the like. At a case position 56
where the voice microphone is built in, it is preferable to set the microphone so as to float on the
elastic material from the case as a device not to mix a large amount of sound due to vibration.
[0051]
Another embodiment of the present invention for the same purpose as that of FIG. 10 is shown in
the sectional views of FIGS. 13, 14, 15, 16, 17 and 18. The concept of the structure that
generates vibration and voice is the same. It goes without saying that adhering the vibrating coil
to the cover via the adhesive layer and the concept of flexibly supporting the magnetic circuit to
increase the vibration level.
[0052]
In the cross-sectional view of the embodiment of FIG. 13, the support portion 60 supports the
back flat portion of the back surface of the yoke top 58 at the outermost periphery of the
magnetic circuit via a tubular rubber 59. Since the support portion 60 itself is fixed to the cover
47, the magnetic circuit including the yoke 57 can be relatively flexibly displaced up and down.
The support portion 60 may be formed in an annular shape and adhered to the cover 47.
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[0053]
FIG. 14 is a cross-sectional view of another embodiment, which is also pressed by a bellows-like
rubber 62 molded in a bellows shape on the back flat portion of the yoke top 58 at the outermost
periphery of the magnetic circuit. To support. As a result, the magnetic circuit including the yoke
57 can be flexibly displaced up and down.
[0054]
FIG. 15 is a cross-sectional view of another embodiment, in which a ring-shaped foamed elastic
material 64 is applied to the flat surface on the back surface of the yoke top 58 at the outermost
periphery of the magnetic circuit. Support flexibly. Both support parts are integrated with the
projection through the cover.
[0055]
An embodiment of the present invention which has the same purpose as that of FIG. 10 but is
configured to suppress the actual assembling and the irregularity of the characteristics is shown
in the cross-sectional views of FIG. 16, FIG. 17 and FIG. In FIG. 16, an annular resin molding
material 74 having a plurality of claw-like projections 75 is adhered to the cover 78. The vicinity
of the inner diameter of the annular resin molding material 74 is also used as a protrusion, and
the annular flat portion 73 having the coil 67 is directly bonded. The support rubber 76 is
hooked on the plurality of claw-like projections 75, and the rubber bottom 77 supports the
bottom of the yoke 68 to support the magnetic circuit consisting of the yoke 68, the plate 66 and
the magnet 65 so as to move up and down flexibly. Since the support rubber 76 does not have to
be fixed by adhesion or the like, the assembly is easy and the irregularities in characteristics are
small.
[0056]
In FIG. 17, instead of supporting the bottom of the yoke 83 with the support rubber 79, the
magnetic circuit is supported so as to move up and down flexibly by alternately hooking on a
plurality of hooks 80. The hook 80 is integrated with the annular ring 82. The annular ring 82 is
adhesively fixed to the bottom portion between the magnet 65 and the yoke 83, and the hook 80
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protrudes from the slit 81.
[0057]
Even in the embodiment of FIGS. 16 and 17, the centering of the magnetic circuit and the coil 67
is the same as that of the upper and lower flexible dampers 71 to which the damper supporting
portion 72 is bonded and fixed at the central portion of the plate 66. By supporting the support
rubber 79 using the hook 80, no rubber is required at the bottom of the yoke 83, and the overall
thickness can be made even smaller.
[0058]
FIG. 18 has almost the same configuration as FIG. 16, but is for making more effective use of the
magnet and thinning the whole as much as possible. The support of the claws 75 and the bottom
of the yoke 88 with the support rubber 76 does not change the flexible support of the magnetic
circuit, but the plate 86 on the magnet 85 has no hole in the center, effectively making the
magnet effective. Available. In addition, by making the damper 90 have a slope so that the center
is high, the damper support 92 is inserted into the hole in the center of the perforated plate 93
adhered to the plate 86 and adhesively fixed, so that the whole becomes thin at the same time as
centering. it can. Then, the elastic material 95 may be interposed for the purpose of alleviating
the collision which occurs rarely with the annular resin molded material 74 in which the yoke
top 94 is bonded and integrated with the cover 78.
[0059]
When the pager vibration actuator of the present invention is used in a cellular phone or the like,
when a rapid acceleration change due to a drop or the like occurs, the cover 78 and the magnetic
circuit having a relatively large mass cause a rapid position change, resulting in In addition, a
large stress may be applied to the damper 71 or the like to cause breakage. In order to avoid this,
the support rubbers 76 and 79 also serve to protect the cover 78 in the vertical direction, and
more importantly, the claw-like projections 75 from a large acceleration change in the parallel
direction.
[0060]
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FIG. 19 is a perspective view of the embodiment of FIG. 16 upside down. The bottom of the yoke
68, which is a part of the magnetic circuit, is supported by a rubber bottom 77 continuous with
the support rubber 76, and the support rubber 76 is hooked on the claw-like projections 75
provided on the annular resin molding material 74 Support flexibly. At this time, it is convenient
to use the electrode wire 96 drawn out from the coil by pressing it with an elastic material 97
and bonding and fixing it and connecting it to the terminal 98.
[0061]
In another embodiment of the present invention shown in FIG. 20, an annular resin molded
material 99 having a claw-like projection 75 on which a support rubber 76 is hooked is integrally
molded with an annular flat portion 102 to which a coil 103 is adhered. And an adhesive sheet
directly adhered to the cover 78. The damper 100 may also be integrally formed. This
configuration has a small number of parts.
[0062]
In FIG. 21, the purpose of flexibly supporting the magnetic circuit to increase the vibration is the
same, and the annular flat portion 108 is directly adhered to the projection 48, but it flexibly
supports the magnetic circuit. Configuration is different. The damper support portion 107 is
bonded and fixed at the central portion of the plate 17, and the magnetic circuit is flexibly
supported only by the damper 106. When a drive current of one polarity is applied, the yoke 57
moves from the cover 47 to a position away from the center of displacement. It is effective to
make the inside of the damper 106 thin and the outside thick in order to soften the vibration
without making the amount of displacement extremely large.
[0063]
In all the embodiments of the present invention, for example, in FIG. 1, the damper 7 is used, and
the damper 21, the damper 42, the damper 71, the damper 90, the damper 100 and the damper
106 are used in FIG. The purpose of the structure of these dampers is to position the coil and
vibrator in the central and vertical directions with respect to the magnetic circuit, but to further
support the center in a rigid manner while having softness of displacement in the vertical
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direction. It was.
[0064]
As shown in FIG. 5 and FIG. 22 which are perspective views of a part of the actuator, it is formed
of a resin material and has a narrow width of about 1 mm and a thin thickness of about 0.2 mm.
Provided in At this time, the entire diameter can be reduced by providing the coil 20 and the coil
67 inside. Further, it is preferable to form the annular flat portions 23, 73 and the dampers 21,
71 for fixing the coil 20 of FIG. 5 and the coil 67 of FIG. 22 by adhesion or the like by integral
molding of resin. When the bobbin 19 is provided as shown in FIG. 5, the 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. Also in FIG. 22, the damper 71 is fixed in position
by the damper support portion 72.
[0065]
Incidentally, as shown in FIG. 22, a circumferential vertical inner wall surface facing the plate 66
is formed by stacking a plurality of thin magnetic material plates and providing a plurality of slits
112 and pressing the yoke 110. It becomes easy to make it deep precisely. In addition, most of
the bottom of the yoke 110 for flowing magnetic flux and the number of annular side surface
portions are increased, and the number of the yoke top 111 is reduced to reduce the overall
weight without sacrificing the purpose as a magnetic circuit. It can be reduced. In addition, it is
preferable to take out the electrode wire 115 from the concave portion 114 in the vicinity of one
of the slits 112. The elastic member 113 separately provided on the top of the yoke 111 is for
suppressing the generation of unnecessary noise at the time of a collision.
[0066]
By the way, in order to enlarge the vibration and suppress the generation of unnecessary noise at
the time of collision, as in the present invention, the vibrating part such as a coil is directly
bonded to the projection of the cover through the adhesive layer to make the yoke of the
magnetic circuit flexible. In contrast to the method supported by the above, an example of the
transition steps leading to the invention is shown. As shown in FIG. 21, when the annular flat
portion 23 is not bonded to the elastic member 117 and the magnetic circuit including the
magnet 16, the plate 17 and the yoke 18 is fixed to the cover 116 by the support portion 120,
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the annular flat portion is flat. It struggles to suppress unnecessary noise due to the collision
between the club and the cover. In particular, there is a problem in selecting the elastic member
117 and maintaining its long-term reliability. And since displacement of the magnetic circuit
containing yoke 18 can not be enlarged, the force by the reaction to coil 20 by accumulation of
elastic energy by a flexible support structure can not be expected, and as a result, annular flat
part 23 integrated with coil 20 It should be noted that the transmission of vibration to the cover
116 does not increase too much.
[0067]
Since the present invention is configured as described above, the following effects can be
obtained.
[0068]
Since an annular flat portion such as a bobbin to which the coil is fixed is directly adhered to the
cover with an adhesive or an adhesive sheet, relative vibration of the coil and the magnetic
circuit can be directly drawn to the cover.
Therefore, it is not necessary to provide a diaphragm corresponding to the cone of the speaker,
and sound can be generated. In addition, since the coils are attached to the cover, it is possible to
suppress unnecessary collision noise due to their collision relatively easily.
[0069]
Furthermore, by flexibly supporting the magnetic circuit with rubber or the like so that the
magnetic circuit such as the yoke can move relatively easily in the vertical direction, elastic
energy accumulated in low frequency vibration in the rubber or the like reacts to the coil As a
result, the cover can generate a large vibration.
[0070]
Furthermore, by supplying a drive current having a polarity to the coil, the magnetic circuit
composed of a yoke, a magnet, etc. flexibly supported by the repulsive force is maintained in a
state separated from the cover, depending on the frequency and current value of the drive
current. The movement of a fixed amplitude and the reaction force at the rise of the drive current
can be applied to the coil to generate large vibrations in the cover through the large
displacement force of the coil.
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[0071]
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.
[0072]
At the time of this drive current, the magnetic circuit hardly collides with the cover etc.
Therefore, the elastic material can be easily made without difficulty in selecting an elastic
material to suppress unnecessary noise generated at the time of collision and ensuring thickness
and material reliability. It is only necessary to simplify the measures when the external
acceleration is greatly changed or when the non-driving is provided.
[0073]
Also, the annular flat portion integrated with the coil is directly adhered to the projection
through the adhesive layer, and the vibration body is removed, so that the generation level of the
unwanted sound is raised so much even if the inclination of the rising is made a little steep The
relative vibration can be increased without.
[0074]
As a result of the above, according to the present invention, the coil and the yoke move only in
the vertical direction, and the vibration energy can be effectively transmitted through the
adhesive layer to the cover such as a resin plate which is relatively thin easily. Can be taken out
effectively.
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In addition, since the starting power is relatively small, power consumption can be reduced.
[0075]
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.
[0076]
Further, in the case of the present invention in which the damper is disposed inside the coil
diameter, the diameter of the drive coil is large, and the overall outer diameter size can be made
small, although the driving force is large. In addition, the thickness is likely to be acceptable as
the case where the vibration generation and the voice generation are shared.
[0077]
In addition, since it is not always necessary to make a hole in the vicinity of the protrusion in
order to generate sound, as a result, it is possible to design a waterproof or dustproof device.
[0078]
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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