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JP2006093774

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DESCRIPTION JP2006093774
[PROBLEMS] To provide a low-cost multi-functional vibration actuator which has a vibration
function and which can be independently reproduced in stereo, and which does not need to
individually cope with space securing and power feeding when mounting on a substrate or the
like. A housing is divided into a plurality of outer frames only, and a sound producing mechanism
provided with a diaphragm is arranged, and a plurality of magnets and pole pieces corresponding
to the sound producing mechanism are arranged on one shared yoke. A plurality of sound
producing mechanisms and one vibration mechanism share parts with one another to operate.
[Selected figure] Figure 1
Stereo compatible multifunction vibration actuator
[0001]
The present invention relates to a multifunctional vibration actuator mounted on mobile
communication devices such as mobile phones and portable electronic devices.
[0002]
In recent years, with the diversification of ring tone melody and sound reproduction functions,
reproduction of stereo sound has been required of portable information terminals.
[0003]
In order to meet the above requirements, a portable information terminal such as a mobile phone
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1
is mainly configured to use a vibrating motor as a configuration using an oscillating motor to
notify an incoming call by vibration, and to use two separate speakers.
As a part of the vibration generating device in the configuration without the stereo function, a
multifunctional vibration actuator (see Patent Document 1) having a function of generating a
vibration and a sound generation function of outputting a ring tone and the like is used.
However, there is a problem that this multi-functional vibration actuator alone can not cope with
stereo output.
WO 2000−556882
[0004]
As mentioned above, in order to give a stereo function to a portable information terminal such as
a mobile phone, at present, a configuration in which a small vibration motor and two speakers
are used is mainly used. It is necessary to attach separately about a vibration actuator and a total
of three parts of two speakers at the time of attachment to the case, and it is necessary to cope
with the problem of arrangement space and the method of electric power feeding separately.
[0005]
Therefore, the present invention provides a multifunctional vibration actuator capable of
supporting stereo output with one component at a low mounting cost when mounted on a device
by arranging sound producing mechanisms serving as a sound source in one housing in parallel.
The purpose is
[0006]
In order to solve the above-mentioned problems, in the multifunctional vibration actuator
according to claim 1, a sound generating mechanism comprising a diaphragm and a coil sharing
a magnet, and a vibration mechanism sharing the coil and comprising the magnet, a yoke and an
elastic body And a housing that mounts both of these mechanisms inside, and by changing the
frequency input to the coil at the time of operation, in a multifunctional vibration actuator
capable of outputting both sound and vibration, one housing A vibration mechanism is integrated
by attaching a plurality of sound generating mechanisms using a diaphragm and a coil in one,
and attaching a plurality of magnets and pole pieces corresponding to each diaphragm and a coil
on one shared yoke. And
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2
[0007]
The invention according to claim 2 is characterized in that, in the multifunctional vibration
actuator according to claim 1, a plurality of diaphragms used for the sound generation
mechanism are integrally formed.
[0008]
The invention according to claim 3 is characterized in that in the multifunctional vibration
actuator according to claim 1 or 2, a through hole for moving air is provided on the side surface
of the housing.
[0009]
In the invention according to claim 4, in the multifunctional vibration actuator according to any
one of claims 1 to 3, the flow rate of air is restricted by adjusting the gap between the outer
periphery of the vibration mechanism and the inner wall of the housing, and the vibration
mechanism And an air damper structure using air between the vibrating mechanism and the
cover as a damper.
[0010]
According to the invention of claim 1, it is possible to obtain a multifunctional vibration actuator
capable of stereo audio output and vibration output with one component without using a
vibration motor and a plurality of speakers.
[0011]
According to the basic driving method of the multifunctional vibration actuator in the present
invention, a coil attached to a diaphragm is disposed between a pole piece made of a magnetic
material and a yoke disposed so as to sandwich a magnet, and a driving current is applied to the
coil. As a result, the magnetic flux between the pole piece and the yoke and the magnetic flux of
the coil act to generate a force in a direction perpendicular to the direction of the current flowing
through the coil, resulting in a structure that vibrates.
[0012]
Accordingly, in the multifunctional vibration actuator of the present invention, the coil vibrates
by applying an audio current to the coil, and the vibration is transmitted to the diaphragm to
function as a speaker.
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[0013]
Further, by inputting an alternating current in the vicinity of the resonance frequency of the
vibration mechanism supported by the elastic body to the coil, the vibration mechanism can be
vibrated to vibrate the casing of the mobile communication device.
[0014]
In the present invention, since the multi-function actuator corresponding to stereo is configured
as one component, the number of attaching processes to the substrate is half as compared with
the case of using a plurality of speakers and a vibration actuator, and the substrate at the time of
assembly It takes only one response for securing space above and supplying electricity.
[0015]
Further, the number of parts can be reduced and the number of assembling steps can be reduced
as compared with the case of using a plurality of speakers or a plurality of multifunctional
vibration actuators.
[0016]
The multifunctional vibration actuator according to the present invention has a structure in
which the vibration mechanism is integrated, so that independent parts can be configured with a
smaller number of parts than reproducing the same function, and a stereo with a simple
structure and high reliability. It becomes possible to use as a multi-functional vibration actuator
corresponding to voice.
[0017]
According to the second aspect of the present invention, in the present invention, the diaphragms
are not integrally attached by the number of the sound generation mechanism, but a plurality of
diaphragms are integrally formed. Lower assembly man-hours and manufacturing costs
[0018]
According to the invention as set forth in claim 3, by providing the through hole for the purpose
of air movement in the housing, the air movement of the back of the diaphragm is controlled, and
good acoustic characteristics can be obtained, and at the time of sound generation It can be used.
[0019]
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According to the invention as set forth in claim 4, the space between the vibration mechanism
outer periphery and the inner wall of the housing is adjusted, and the flow rate of air is adjusted
to adjust the air existing between the vibration mechanism and the diaphragm when the
vibration mechanism is driven; By using the air between the mechanism and the cover as a
damper, stable frequency characteristics with small resonance sharpness can be obtained
without increasing the number of parts.
[0020]
A multifunctional vibration actuator according to an embodiment of the present invention will be
described below with reference to the drawings.
FIG. 1 shows schematic cross-sectional views (a), (b) and (c) of a first embodiment according to
the present invention from respective directions.
[0021]
As can be seen from the cross-sectional views shown in FIG. 1, the multifunctional vibration
actuator according to the present embodiment includes a sound generation mechanism including
a diaphragm 40, coils 20a and 20b, pole pieces 60a and 60b, and magnets 70a and 70b, and
coils 20a, 20b, pole pieces 60a and 60b, magnets 70a and 70b, yokes 80, springs 30a and 30b, a
housing 50 for housing them, a cover 50 and terminals 90 to which the coils 10a and 20b are
connected ing.
Here, the pole pieces 60a, 60b and the yoke 80 use a magnetic material.
[0022]
In the present embodiment, when an alternating current is caused to flow through the coils 20a
and 20b arranged in the magnetic gap A, the current acts on the magnetic flux to vibrate the coil.
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Therefore, by controlling the applied current, the vibrating mechanism or the diaphragm 40 or
both of the pole pieces 60a and 60b, the magnets 70a and 70b, and the yoke 80 can be vibrated
and generated.
[0023]
The multifunctional vibration actuator in the present invention can control the movement of the
sound generation mechanism and the vibration mechanism by the input alternating current.
Therefore, by separately inputting the alternating current of the frequency for audio output to
the left and right coils 20 and 21 in FIG. 1, it is possible to output an independent voice by the
left and right sound generation mechanisms.
[0024]
Moreover, when using it as a vibration actuator, the said vibration mechanism vibrates by
inputting into the coil 20a, 20b the alternating current of the frequency (frequency near the
natural frequency of a vibration mechanism) which drives a vibration mechanism.
[0025]
In the present embodiment, by providing the through holes H in the housing 50 shown in FIG. 2,
it is possible to reproduce clear sound when used as a speaker.
[0026]
In addition, by adjusting the gap between the yoke 80 and the housing 50 and limiting the
amount of movement of the air flowing therebetween, the air between the diaphragm 40 and the
vibration mechanism and the space between the cover 10 and the vibration mechanism sandwich
the vibration mechanism. By limiting the amount of air movement that occurs in the above, and
using each air as a damper, it is possible to obtain frequency characteristics in which the
resonance sharpness (Q) of the vibration mechanism is reduced.
[0027]
As described above, by using the multifunctional vibration actuator according to the present
embodiment, it is possible to create a multifunctional vibration actuator that has a stereo output
function and is compatible with a space-saving and easy-to-assemble stereo output.
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[0028]
Sectional view according to an embodiment of the present invention An external view showing a
positional relationship between a housing, a cover, and a terminal in a multifunctional vibration
actuator according to an embodiment of the present invention
Explanation of sign
[0029]
Reference Signs List 10 cover 20a, 20b coil 30a, 30b spring 40 diaphragm 50 housing 60a, 60b
pole piece 70a, 70b magnet 80 yoke 90 terminal A magnetic gap H through hole
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