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DESCRIPTION JP2013038769

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DESCRIPTION JP2013038769
The present invention provides a multifunctional vibration actuator which is easy to reduce its
overall thickness and maintain its vibration characteristics without being restricted in the place
where it is mounted in a mounting case to be mounted. SOLUTION: By forming a structure in
which a part of a separate weight is cut out, it is possible to prevent the reduction of the air
viscosity and the lateral blurring of the magnetic circuit part, and it is possible to improve the
durability and the reliability as a whole. It became. In addition, since it is easy to configure a thin
structure as a whole, it is possible to obtain an effect of space saving in the mounting case.
[Selected figure] Figure 5
Adjustment method of vibration characteristics in multifunctional vibration actuator
[0001]
The present invention comprises a magnetic circuit unit having a magnet and a diaphragm
having a voice coil, and the suspension is used to support the magnetic circuit unit in a housing,
the diaphragm is provided at the end of the housing, and the voice is The present invention
relates to a multifunctional vibration actuator having a dynamic structure having a function of
generating a sensational sensation due to a vibration of the magnetic circuit unit by an input to a
coil and an acoustic reproduction function due to a vibration of the diaphragm.
[0002]
Currently, mobile communication devices typified by mobile phones are provided with an
incoming call notification function for notifying a user of an incoming call by sound reproduction
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and sensational vibration.
Among such mobile communication devices, in recent years, those that perform the abovementioned sound reproduction and vibration generation with a multifunctional vibration actuator
represented by Japanese Patent Application Laid-Open No. 2001-095076 (hereinafter described
as Patent Document 1) are used.
[0003]
Here, the multifunctional vibration actuator described in Patent Document 1 is characterized in
that a stabilizer is provided for the purpose of preventing lateral blurring of a magnetic circuit
portion provided with a magnet at the time of bodily sensation vibration. Moreover, as a
structure aiming at the improvement of the same vibration characteristic, a multifunctional
vibration actuator described in Japanese Patent Application Laid-Open No. 2001-293436
(hereinafter described as Patent Document 2) is disclosed. We are trying to improve the vibration
characteristics from the aspect.
[0004]
Patent Document 1: Japanese Patent Application Publication No. 2001-095076 Patent Document
2: Japanese Patent Application Publication No. 2001-293436
[0005]
As described above, the structure described in each of the patent documents is characterized in
that the behavior of the magnetic circuit portion at the time of occurrence of body sensation
vibration is stabilized.
More specifically, the structure described in Patent Document 1 obtains the effect by a stabilizer
provided separately, and the structure described in Patent Document 2 obtains the effect by
damping due to air viscosity. However, with the progress of thinning mobile phones in recent
years, thinning of the multifunctional vibration actuator is also required while maintaining the
conventional performance.
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[0006]
With respect to the demand for the reduction in thickness, the structure described in Patent
Document 1 has a problem that it is difficult to reduce the thickness of the entire element
because a space for providing a stabilizer is required on the side of the housing. Further, the
structure described in Patent Document 2 reduces the viscosity of air acting on the magnetic
circuit portion by releasing air from the through hole. For this reason, it is necessary to open and
arrange the through hole at the time of mounting on a mobile phone.
[0007]
In order to solve the problems described above, the invention described in the present
application provides a multifunctional vibration actuator that is easy to reduce the overall
thickness and maintain the vibration characteristics without being limited by the arrangement
location in the mounting housing to be mounted. The purpose is to
[0008]
In order to achieve the above object, the multifunctional vibration actuator according to the
present invention performs sound reproduction with a diaphragm provided with a voice coil as a
basic structure, and a magnetic circuit having a magnet and a weight in a housing provided with
the sound reproduction portion. A dynamic structure in which the magnetic circuit portion is
supported by a suspension.
Further, in the basic structure, regarding the planar shape of the weight provided in the magnetic
circuit portion, a part of the diameter dimension in the planar shape is the magnetic circuit, while
the notch portion is provided at the target position. The diameter is set to 97% or more with
respect to the diameter of the inner wall of the storage unit for storing the unit.
[0009]
In the second aspect of the present invention, the weight is provided with a step in the thickness
direction.
[0010]
Further, in the third aspect of the present invention, the weight is configured by adding a
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bending process or the like to the plate material.
[0011]
In the fourth aspect of the present invention, the yoke and the weight are replaced by a yoke
integrated with the weight.
[0012]
By using such a structure, in the multifunctional vibration actuator according to the present
invention, the sharpness of the vibration characteristic can be adjusted by the notch amount of
the notch portion provided on the outer peripheral portion of the weight.
More specifically, plastic deformation of the suspension caused by impact or the like is caused by
providing a notch in the weight set to a diameter dimension of 97% or more of the diameter
dimension of the inner wall of the housing portion for housing the magnetic circuit portion. At
the same time, the effect of being able to adjust the Q value of the vibration characteristic is
obtained.
[0013]
Here, the effect of preventing plastic deformation of the suspension is an effect that can be
realized by preventing plastic deformation in the radial direction of the suspension by adding a
restriction on the diameter to the weight provided in the magnetic circuit portion.
That is, while the prior art has a structure in which the plastic deformation of the suspension is
reduced by a stabilizer or the like, or the change in vibration characteristics due to the plastic
deformation is allowed, the structure described in the present application has a radial direction
with respect to the planar shape of the weight. The structure is designed to prevent plastic
deformation of the suspension by adding dimensional limitations.
[0014]
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Further, with regard to the effect of adjusting the Q value of the vibration characteristic by the
notched portion, the structure described in the present application changes not only the notch
amount but also the air viscosity and flow rate during bodily sensation generation depending on
the shape of the notched portion. Therefore, the Q value can be adjusted from both the notch
amount and the notch shape.
More specifically, in the structure described in the present application, an air viscosity which
becomes a damper component by setting a cut-out portion according to the required
specification for the Q value of the vibration characteristic calculated by the ratio of the half
width to the resonance frequency. Is adjusted to obtain a target Q value. Therefore, unlike the
structure described in Patent Document 2 mentioned at the outset, the structure described in the
present application can stably maintain vibration characteristics even in a sealed state.
Furthermore, by using means for reducing the air viscosity due to the notch portion, the above
adjustment can be performed while suppressing the weight reduction of the weight and
maintaining the vibration amount.
[0015]
Further, by using the second aspect of the present invention, in addition to the effects described
above, the collision between the suspension that is deformed at the occurrence of bodily
sensation vibration and the weight is alleviated, and the plastic deformation of the suspension
due to the collision is prevented. It becomes possible. By using such a structure, the structure
described in the present application can prevent plastic deformation of the suspension not only
in the radial direction but also in the displacement in the thickness direction in the thin structure.
In addition, since the structure of this embodiment prevents plastic deformation of the
suspension in both the radial direction and the thickness direction at the time of vibration of the
magnetic circuit portion, it has an effect of prolonging the life by suppressing the wear of the
suspension. There is.
[0016]
Further, by using the third aspect of the present invention, the step portion of the weight is
formed by bending. For this reason, it is possible to suppress variations in the flatness and the
outer dimensions of the weight surface, and to improve the positioning and dimensional accuracy
of the weight with respect to the magnetic circuit portion. In addition, the adjustment of the Q
value, which is the object of the basic structure of the present invention, can be easily performed
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by the improvement of the dimensional accuracy.
[0017]
Further, by using the fourth aspect of the present invention, in addition to the effects of reducing
the number of parts and facilitating the assembly, the effect of increasing the weight of the
magnetic circuit portion by integrating the yoke and the weight Can also be obtained. This is
because it is not necessary to set the clearance and the tolerance which are necessary when
separately forming the yoke and the weight, and in the thin structure, it is possible to secure the
amount of vibration by the weight of the magnetic circuit portion. .
[0018]
As described above, by using the structure described in the present application, there is no
restriction on the arrangement location in the mounting housing to be mounted, and a
multifunctional vibration actuator that facilitates overall thinning and maintenance of vibration
characteristics. It is possible to provide
[0019]
A perspective view of the multifunctional vibration actuator used in the preferred embodiment of
the present invention An exploded perspective view of the multifunctional vibration actuator
used in the preferred embodiment of the present invention A of the multifunctional vibration
actuator shown in FIG. 1 is a side sectional view taken along the line B-B 'of the multifunctional
vibration actuator shown in FIG. 1; FIG. 2 is a perspective view of a weight used in the preferred
embodiment of the present invention; 1 is a plan view showing the arrangement of weights in a
perspective view of a yoke-integrated weight used in the configuration modification of FIG. 1 A
side sectional view of the yoke-integrated weight shown in FIG.
[0020]
Hereinafter, the best embodiment of the present invention will be described with reference to
FIGS. 1, 2, 3, 4, 5 and 6. FIG.
1 is an overall perspective view of the multifunctional vibration actuator used in the present
embodiment, FIG. 2 is an exploded perspective view, and FIG. 3 is a side sectional view of the AA
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'cross section in FIG. 1 is a side sectional view taken along the line B--B 'of FIG. 1, FIG. 5 is a
perspective view of a single weight, and FIG. 6 is an arrangement of weights within the cover of
FIG.
The A-A 'cross section in FIG. 3 is a side cross-sectional view not passing through the notch
portion of the weight, and the B-B' cross section in FIG. 4 is a side cross-sectional view passing
through the weight notch portion.
[0021]
As can be understood from FIGS. 1, 2, 3 and 4, the multifunctional vibration actuator used in the
present embodiment includes an acoustic reproducing unit constituted by a diaphragm 2 to
which a voice coil 3 is attached, a pole piece 6, It has a vibration generating unit that supports
the magnetic circuit unit consisting of the magnet 7, the yoke 8 and the weight 9 on the housing
4 via the suspension 5, and the acoustic reproduction is performed by the mutual magnetic force
acting between the voice coil 3 and the magnet 7. It has a dynamic structure in which sound
reproduction by the unit and vibration generation by the vibration generation unit are
performed. The suspension 5, the pole piece 6, and the yoke 8 are made of magnetic material,
and the magnet 7 is magnetized in the thickness direction. The suspension 5 is configured to be
insert-molded in the housing 4.
[0022]
By using such a structure, the multifunctional vibration actuator described in the present
application has been able to provide sound reproduction and a sensational vibration generation
function with a single device. More specifically, providing a sound reproduction and vibration
generation function by the single device by switching the signal input to the voice coil 3 between
the resonance frequency band of the sound reproduction unit and the resonance frequency band
of the vibration generation unit. It is possible. In the present embodiment, the grille 1 provided
on the outer periphery of the diaphragm 2 is configured to prevent contact between the
diaphragm 2 and the inner wall of the mounting case when the mounting case is assembled.
[0023]
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Further, as will be understood from FIG. 3 and FIG. 4, the magnetic circuit portion according to
the present embodiment forms a magnetic gap g by the suspension 5, the yoke 8, the magnet 7
and the pole piece 6. Therefore, the suspension 5 is used as a part of the magnetic path forming
the magnetic gap g, and the magnetic circuit portion is made thin while maintaining the magnetic
efficiency when the voice coil 3 is disposed in the magnetic gap g. I was able to. In addition, along
with the thinning of the magnetic circuit portion, it has become possible to reduce the overall
thickness dimension while suppressing the decrease in the amount of vibration.
[0024]
Further, as understood from FIGS. 3, 4, 5 and 6, in the structure according to the present
embodiment, the weight 9 provided in the magnetic circuit portion is formed of a plate material,
and the outer periphery of the weight 9 is notched k It has a planar shape with In addition, the
outer peripheral dimension d1 of the weight is set to 97% or more with respect to the inner
peripheral dimension d2 of the cover inner wall, and a concentric step e is formed on the surface
of the weight.
[0025]
By using such a structure, the multifunctional vibration actuator according to the present
embodiment limits the horizontal displacement generated in the suspension 5 within the elastic
deformation range at the time of an impact such as falling, and is provided on the weight surface.
The step portion e makes it possible to prevent the plastic deformation of the suspension 5 due
to the contact between the weight and the suspension. In addition, in this embodiment, the
component arrangement is such that the distance c1 between the housing bottom and the weight
outer periphery is shorter than the distance c2 between the voice coil and the yoke, and the
housing bottom receives the impact in the vibration direction. It functions as a stopper for
preventing the collision between the voice coil and the magnetic circuit unit. With these multiple
effects, the structure described herein can protect the internal structure in both the horizontal
and vibrational directions.
[0026]
Further, in the present embodiment, the weight 9 is processed by punching and the stepped
portion e is formed by bending. In addition, by providing the weight 9 on the outer periphery of
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the yoke 8, the air viscosity acting on the magnetic circuit portion is adjusted by the shape of the
weight. As a result, it becomes easy to improve the accuracy of the weight of the weight 9 during
manufacture and to adjust the air viscosity by the weight 9, making it possible to stably obtain
the target Q value. In addition, the dimension setting of the weight outer circumference with
respect to the housing inner wall, the mutual positioning between the cover inner wall-weight
outer circumference and the weight inner circumference-yoke during assembly can also be
performed with high accuracy.
[0027]
Further, as will be understood from FIG. 4, in the present embodiment, the sound release holes h
of the cover side wall are provided at the same positions as the notches k of the weight. For this
reason, it was possible to obtain the effect of reducing the viscosity of the air at the time of the
occurrence of the vibration while using the notched portion k of the weight as a path for sound
emission. In the structure described in the present application, since the air viscosity is adjusted
by the notch portion k, stable vibration characteristics can be maintained even if the sound
emitting hole h is closed at the time of installation in the mounting case.
[0028]
Here, a configuration modification example in which the yoke 8 and the weight 9 are integrated
according to the present embodiment is described using the perspective view of the yoke
integrated weight shown in FIG. 7 and the side sectional view of the yoke integrated weight
shown in FIG. Do. In this modification, the yoke 8 and the weight 9 are configured as a single
part. Therefore, in addition to the effect of reducing the number of parts, the effect of facilitating
the positioning of the magnetic circuit on the side wall of the cover can be obtained.
[0029]
As described above, by using the structure described in the present embodiment, a
multifunctional type in which overall thinning and maintenance of vibration characteristics are
easy without being limited by the arrangement location in the mounting housing to be mounted.
The vibration actuator could be obtained.
[0030]
Reference Signs List 1 grill 2 diaphragm 3 voice coil 4 housing 5 suspension 6 pole piece 7
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magnet 8 yoke 9 weight 10 cover 11 yoke integrated weight c1 distance between housing
bottom and weight outer periphery c2 distance between voice coil and yoke d1 weight outer
diameter d2 cover Inner circumference dimension e Step height g Magnetic air gap h Sound
release hole k Notched portion
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