JP2009027682

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DESCRIPTION JP2009027682
A multifunctional type capable of improving the reproduction sound pressure at the time of
sound reproduction without changing the area required for mounting on a mounting substrate,
and flattening the vibration characteristics and increasing the amount of vibration at the time of
bodily sensation vibration. Provided is a vibration actuator. SOLUTION: A notch is provided in a
magnetic circuit mounting portion provided in a yoke, and the voice coil diameter is set beyond
the edge portion of the diaphragm, so that a sense of sensation can be felt without changing the
entire size of the multifunctional vibration actuator. The amount of vibration at the time of
vibration occurrence is increased to improve the sound pressure at the time of sound
reproduction. [Selected figure] Figure 4
Magnetic circuit structure of multifunctional vibration actuator
[0001]
At present, some models of mobile communication devices represented by mobile phones are
provided with a multi-function function for notifying the user of the incoming call with sound
reproduction and sensational vibration by one device. is there.
[0002]
In order to add such a function, a small speaker such as Japanese Patent Application Laid-Open
No. 2006-311156 (hereinafter described as Patent Document 1) and Japanese Patent Application
Laid-Open No. 2005-294982 (hereinafter described as Patent Document 2) is combined with a
sensational vibration generating device. The configuration is used, and the user can be notified of
an incoming call by the sound reproduction function by the speaker and the vibration generation
function of the sensation vibration generation device.
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[0003]
Among the devices described above, the speakers described in Patent Documents 1 and 2 expand
the size of the voice coil diameter with respect to the diaphragm as compared with the
conventional speakers, and the mounting is limited without expanding the diaphragm diameter. It
is possible to improve the sound pressure in space.
[0004]
In addition to the above effects, in Patent Documents 1 and 2 described above, the voice coil is
attached to the portion of the diaphragm extended from the center dome, thereby reducing the
rigidity in the annular vibration portion around the center dome and setting the lowest resonance
frequency. It can be suppressed.
[0005]
Moreover, in patent document 2, the voice coil which extended the center dome and expanded
the diameter is provided, and it is said that the improvement of the sound pressure by the
expansion of a center dome is carried out with the widening of the reproduction ¦ regeneration
zone by suppressing the said minimum resonant frequency. It has an effect.
[0006]
Patent document 1: JP 2006-311156 Patent document 2: JP 2005-294982
[0007]
However, when the small-sized speakers described in Patent Documents 1 and 2 are used, there
is a problem that it is necessary to separately mount a sensational vibration generating device.
[0008]
For this reason, it is necessary to take a large mounting space at the time of incorporation into
the mobile phone main body, and as a result, it becomes difficult to miniaturize the entire mobile
phone.
[0009]
In view of these problems, according to the present invention, in a multi-functional vibration
actuator that performs acoustic reproduction and generation of sensational vibration with a
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single device, the sound pressure is increased by expanding the diameter of the voice coil without
changing the size of the diaphragm. The aim is to increase the
[0010]
In order to achieve the above object, according to the invention as set forth in claim 1, in the
multifunctional vibration actuator of the dynamic structure having the yoke provided with the
cup-shaped magnet mounting portion, a notch is formed in the magnetic circuit mounting
portion for generating bodily sensation vibration. It is characterized in that a part is provided.
[0011]
By using the above-mentioned structure, in the invention according to claim 1, the magnet
diameter can be expanded without changing the yoke outer diameter.
For this reason, the effect of the increase of the magnetic flux by the expansion of a magnet
diameter, and the improvement of the magnetic efficiency accompanying it can be acquired.
[0012]
In addition, since the reproduction sound pressure can be improved by the increase of the
magnetic flux, in addition to the improvement of the magnetic efficiency due to the increase in
diameter of the magnet, the vibration characteristic is said to be flattened when the disk shaped
magnet is used. You can get the effect.
[0013]
The invention according to claim 2 is characterized in that, in the multifunctional vibration
actuator according to claim 1, the voice coil attached to the diaphragm is provided so as to
protrude from the edge surface of the diaphragm.
[0014]
Therefore, in the multifunctional vibration actuator according to claim 1, it is possible to expand
only the diameter of the voice coil provided on the diaphragm in accordance with the enlarged
magnet diameter, and expand the planar shape of the diaphragm. Without, it is possible to
increase the sound pressure at the time of sound reproduction.
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[0015]
In the third aspect of the present invention, in the multifunctional vibration actuator according to
the first or second aspect, a voice coil attachment portion having a notch portion is provided in a
diaphragm constituting the sound reproduction portion. The voice coil attachment portion can be
formed in accordance with the enlarged magnet diameter in the multifunctional vibration
actuator according to claim 1 or 2, which is characterized in that the voice coil attachment
portion is attached.
[0016]
In addition to the effects described above, since the multifunctional vibration actuator of the
present invention uses a dynamic structure, the amplitude at the time of occurrence of bodily
sensation vibration can be set larger compared to other structures such as movable iron type etc.
It has become.
[0017]
Hereinafter, the best embodiment of the present invention will be described with reference to
FIGS. 1 to 4.
[0018]
FIG. 1 shows a perspective view of a multifunctional vibration actuator used in the present
embodiment.
As can be seen from FIG. 1, the multifunctional vibration actuator of this embodiment uses a
housing having a rectangular planar shape.
For this reason, it is possible to closely arrange other mounting parts at the time of mounting on
a mounting substrate, and it is possible to obtain an effect of facilitating the arrangement in a
narrow portion at the time of assembling in a housing.
[0019]
2 is an exploded perspective view of the multifunctional vibration actuator shown in FIG. 1, FIG.
4 is a side sectional view of the multifunctional vibration actuator shown in FIG. 5 shows a rear
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perspective view and a plan view of the diaphragm, respectively.
[0020]
As can be understood from FIGS. 2, 3 and 4, the multi-functional vibration actuator used in this
embodiment is a voice coil attachment portion D having a notch portion d 'in a diaphragm
formed of the center cap 1 and the diaphragm 2. The sound reproducing unit is configured by
fixing the voice coil 3 to the voice coil mounting portion.
[0021]
By using the above-described structure, the multifunctional vibration actuator of the present
invention can project 3 d from the edge surface S of the diaphragm 2 to enlarge the diameter of
the voice coil 3.
Also, by expanding the voice coil diameter, it was possible to increase the reproduction sound
pressure without changing the shape of the diaphragm.
[0022]
Further, in the present embodiment, the configuration in which the center cap 1 has a flat plate
shape is used, and the acoustic characteristics can be easily adjusted by changing the plate
thickness, and the thickness dimension of the entire actuator can be suppressed. There is.
[0023]
Furthermore, in the present embodiment, when the diaphragm 2 and the center cap 1 are
bonded to each other, a structure in which the concave portion i on the back of the voice coil
attachment portion is filled with the adhesive h is used.
For this reason, the rigidity of the voice coil attachment portion can be improved, and the
attenuation between the voice coil and the diaphragm at the time of sound reproduction can be
suppressed.
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[0024]
In addition, the multifunctional vibration actuator described in the present embodiment has a
structure in which a V-shaped groove c is provided in a substantially rectangular diaphragm
corner.
Therefore, it is possible to disperse the distortion of the annular support portion in the
diaphragm 2 and to improve the acoustic characteristics at the time of sound reproduction.
[0025]
Further, as to the magnetic circuit portion generating the bodily sensation vibration, a cupshaped magnet mounting portion having a notch portion 6d 'is provided in the yoke 6 made of
magnetic material, and the magnet 5 and the pole piece 4 are fixed to the magnet mounting
portion. It uses a structure.
[0026]
Further, in the present embodiment, the diameter dimension of the magnet mounted on the
magnetic circuit portion is expanded by using a structure in which only a part of the magnet
mounting portion is cut away, and the magnetic efficiency at the time of sound reproduction and
sensation vibration is generated. Was able to improve.
[0027]
Further, as described above, in the present embodiment, the disk-shaped magnet 5 is combined
with the rectangular yoke 6.
Therefore, the vibration characteristic that becomes unstable due to the rectangular planar shape
of the yoke 6 is solved by using the disk-shaped magnet 5 having a high magnetic flux density at
the end face, and the yoke 4 matched to the housing shape A sufficient amount of vibration and
flat vibration characteristics by the disk-shaped magnet could be obtained.
[0028]
Further, as can be understood from the exploded perspective view shown in FIG. 2, in the present
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embodiment, the suspension for supporting the magnetic circuit portion has a structure using the
frame-shaped suspension 7 having a planar shape with the corner portion protruding. The
magnetic circuit portion is supported on the housing 8 by the attachment portions 7b and 7e.
[0029]
As a result, when the bodily sensation vibration occurs, the suspension corners absorb the
distortion generated in the entire suspension, and the problem of the rotation of the magnetic
circuit portion at the time of the bodily sensation vibration that the conventional radiation type
suspension had is solved. We were able to.
[0030]
In addition to the above effects, in the present embodiment, a structure is used in which the
magnetic circuit portion is supported in a projecting state from the end of the housing 8 and the
magnetic circuit portion is protected by the cover 9 attached to the outer edge of the housing.
For this reason, in the present embodiment, the outer edge of the yoke is formed larger than the
inner wall of the housing, and the end of the housing can be functioned as a stopper f for impact
resistance corresponding to the outer edge of the yoke.
[0031]
As described above, by using the multifunctional vibration actuator described in this
embodiment, the sound pressure can be increased by expanding the diameter of the voice coil
without changing the size of the diaphragm, and the overall size can be easily reduced. It has
become possible to obtain a multifunctional vibration actuator that can
[0032]
A perspective view of a multifunctional vibration actuator used in the present embodiment An
exploded perspective view of the multifunctional vibration actuator used in the present
embodiment A side sectional view taken along the line a-a 'in FIG. Voice coil attachment part of
the diaphragm used in FIG. 4 is a plan view of the voice coil mounted on the diaphragm in FIG. 4
Explanation of sign
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[0033]
Reference Signs List 1 center cap 2 diaphragm 3 voice coil 3 d voice coil projecting portion 4
pole piece 5 magnet 6 yoke 6 b yoke side suspension mounting portion 6 d ′ yoke cutout 7
suspension 7 b yoke mounting portion 7 e housing mounting portion 8 housing 9 cover 10
contact terminal c V groove D voice coil attachment part d 'notch of voice coil attachment part f
stopper mechanism g magnetic air gap h adhesive i diaphragm recess S edge surface
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