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JP2004222208

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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 JP2004222208
The present invention provides a vibration speaker that resonates and vibrates a magnetic circuit
unit inside a case with large inertial force and efficiently transmits the vibration of the magnetic
circuit unit to a housing of a mobile phone or the like. SOLUTION: The lower surface of a case 10
in which a magnetic circuit unit 30 is supported via a gimbal 40 is sealed by an elastic plate 60,
and a substantially central portion of the elastic plate is connected to a bottom 38 of the
magnetic circuit unit. Then, the elastic plate 60 prevents the vibration width of the magnetic
circuit unit 30 from becoming excessive and prevents the magnetic circuit unit 30 from colliding
with the inner wall of the case 10 or the like. At the same time, the magnetic circuit unit 30,
together with the elastic plate 60, causes the large inertial force to resonate and vibrates, and
much of the vibrational energy stored in both of the magnetic circuit unit 30 and the elastic plate
60 Tell to etc. [Selected figure] Figure 1
Vibration speaker
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
vibration speaker for use in a portable telephone or the like in which a speaker that emits sound
also serves as a vibration source serving as a vibrator. [0002] As the above-mentioned speaker,
there is a vibrating speaker described in the specification and drawings of Japanese Patent
Application No. 2002-216027. In this speaker, a low frequency current of low frequency of 100
to 170 Hz or a low frequency current of a waveform close to the low frequency of 100 to 170 Hz
flows in a voice coil provided on the back side of a vibrating cone provided on the top of the case.
It is possible to cause resonant vibration in the vertical direction and the like in the magnetic
circuit portion supported in the space via a gimbal made of an elastic material. Then, the
resonance vibration generated in the magnetic circuit unit including the yoke on which the
magnet is mounted can be transmitted to the housing or the like of the mobile phone on which
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the case is mounted. On the other hand, when a voice waveform current that changes in a
complex frequency range of 200 to 10000 Hz is applied to the voice coil, resonance vibration is
generated in the magnetic circuit portion supported via the gimbal in the inner space of the case.
It is possible to vibrate the vibration cone in which the voice coil is provided in a strong and weak
manner following the waveform of the voice waveform current without causing the voice coil to
move. And sound can be generated from the vibration cone. SUMMARY OF THE INVENTION
However, when the above speaker is used for a vibrator such as a portable telephone, if the input
power to the voice coil is increased in order to obtain strong vibration, the gimbal is mounted
inside the case. As the vibration width of the magnetic circuit unit supported by the magnetic
circuit unit increased, the magnetic circuit unit repeatedly and violently collided with the inner
wall of the case and the stopper inside the case to generate unpleasant noise. Then, there is a
problem that the input power of the voice coil can not be increased until a strong vibration with a
certain response is obtained. In addition, in the vibration speaker having such a structure, in
order to cause strong vibration with sufficient response, the magnetic circuit portion supported
via the gimbal is formed thick and large inside the case to increase its weight. It is necessary to
cause the magnetic circuit portion to generate strong resonance vibration with a large vibration
width. By the way, the said vibration speaker incorporated in a mobile telephone etc. is required
size reduction and thickness reduction. However, when the vibration speaker is miniaturized and
thinned, it is necessary to make the magnetic circuit portion supported inside the case thin and
small accordingly.
Therefore, the weight of the magnetic circuit unit is reduced, and the magnetic circuit unit can
not be resonantly vibrated in the vertical direction or the like by a large inertial force inside the
case. And, from the vibration speaker configured as such, a strong vibration with sufficient
response can not be obtained. Therefore, as a result of intensive studies, the inventors of the
present invention have been able to obtain strong vibration with a certain response on the
housing side of a portable telephone, etc., even in the case of a vibration speaker that has been
miniaturized and thinned as described above. In order to do so, it was found that it is necessary
for the vibration speaker itself to be able to realize a state in which stable high vibration energy
strong against disturbances is maintained. That is, the rate at which the vibration of the vibration
speaker is transmitted to the housing or the like of the mobile telephone in which it is mounted is
determined by the mounting method of the vibration speaker or the rigidity of the housing of the
mobile telephone, etc. It has been found that it is necessary to make it possible to realize a state
in which the vibration speaker itself maintains a stable high vibrational energy, in order to
vibrate the etc. more strongly. More specifically, the above-mentioned vibration speaker having a
structure in which the magnetic circuit unit is supported via a gimbal inside the case has a large
"value of ratio of vibration energy to energy lost as vibration loss", which is generally called Q
factor. When the vibration energy of the vibration speaker is not efficiently transmitted to the
housing of the mobile phone, most of the power input to the voice coil is converted to the
vibration energy of the magnetic circuit unit and is stored in the magnetic circuit unit. If a large
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amount of power is supplied to the voice coil, the amplitude of the magnetic circuit becomes
excessive, causing the magnetic circuit to stop on the inner wall of the case or the stopper inside
the case as described above. It has been found that it is likely to fall into an unstable state which
makes repeated collisions and produces unpleasant noise. As a measure for solving such a
problem, a method is conceivable in which the resonance frequency of a housing of a mobile
phone or the like is matched with the resonance frequency of the magnetic circuit unit.
According to this method, it is possible to efficiently transmit much of the vibrational energy of
the magnetic circuit portion to be resonated and vibrated to the housing of the portable
telephone and the like. Then, it is possible to substantially resonate and vibrate the housing or
the like of the mobile phone with a large force by substantially synchronizing with the vibration
of the magnetic circuit portion to be resonantly vibrated inside the case. However, the housing or
the like of the portable telephone is usually formed of a hard rigid member, and its resonance
frequency is higher than that of the magnetic circuit unit supported inside the case via a gimbal
made of an elastic material, It is difficult to match the resonant frequencies of the two.
Therefore, in order to solve such a problem, the vibration energy of the magnetic circuit portion
is transmitted to the housing of the mobile telephone from the relationship between the vibration
speaker and the housing of the mobile telephone on which it is mounted using some other
means. Most of the power input to the voice coil is turned to the vibration energy of the magnetic
circuit, and the amplitude of the magnetic circuit becomes too large. We thought that it would be
good if it could be made to prevent the situation where the stopper inside the case repeatedly
and violently collides and emit an unpleasant sound. Then, even if a large amount of power is
supplied to the voice coil, it is preferable that the amplitude of the magnetic circuit unit is
prevented from becoming excessive and that the magnetic circuit unit can stably maintain a high
vibration energy state. I thought about it. In addition, in the case where it is suppressed that the
vibration width of the magnetic circuit portion to be resonantly vibrated in the vertical direction
or the like in the case inner space is suppressed by using any means in this way, the magnetic
circuit portion Even if the thickness and size of the sensor are increased, it is possible to prevent
the magnetic circuit portion that resonates and vibrates in the narrow case inner side of the
miniaturized and thinned vibration speaker from colliding with the inner wall of the case or the
stopper inside the case. I thought. Then, it was conceived that it would be possible to increase the
weight of the magnetic circuit unit, to increase the inertial force of the magnetic circuit unit, and
to cause the magnetic circuit unit to resonate strongly. Then, the vibrational energy stably stored
in the magnetic circuit unit to be resonantly vibrated is increased, and most of the vibrational
energy can be effectively used for the consumption energy to vibrate the housing etc. of the
portable telephone through the case etc. I thought. Then, it was conceived that it was possible to
vibrate the housing etc. of the mobile phone strongly. Then, based on such an idea, the weight of
the magnetic circuit portion is increased to increase the vibration energy stored in the magnetic
circuit portion to be subjected to the resonance vibration, and the resonance vibration is caused
in the case inner space. A vibration speaker that suppresses excessive vibration width of the
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magnetic circuit unit and prevents the magnetic circuit unit from colliding with the inner wall of
the case or a stopper inside the case, and the vibration accumulated in the magnetic circuit unit
We have developed a vibration speaker that can effectively vibrate the housing of a mobile
phone, etc., by effectively using much of the energy for the consumption energy that vibrates the
housing of the mobile phone. That is, the present invention is a vibration speaker in which the
vibration width of the magnetic circuit portion to be resonantly vibrated in the case inner space
is suppressed from being excessive and the inertial force of the magnetic circuit portion to be
resonantly vibrated is enhanced. An object of the present invention is to provide a vibration
speaker capable of strongly vibrating a housing or the like of a mobile phone.
SUMMARY OF THE INVENTION In order to achieve the above object, in the vibration speaker of
the present invention, the upper surface of a cylindrical case which opens up and down is sealed
by a vibration cone, and voices are formed on the cone. The coil is protruded toward the inside of
the case. A magnetic circuit unit comprising a yoke on which a magnet is mounted is disposed in
a case inner space on the inner side of the cone, and the voice coil is disposed in a groove formed
between the magnet of the magnetic circuit unit and the yoke. It is loosely fitted so as to be able
to vibrate vertically and so on. The yoke is supported inside the case via a gimbal made of an
elastic material. An airflow passage is opened in at least one of the gimbal or the yoke. The
magnetic circuit portion supported inside the case via the gimbal is a sinusoidal low frequency
current flowing in the voice coil or a low frequency current having a waveform close to it, and
generates sound in the vibrating cone. The low frequency current lower than the voice waveform
current flowing through the voice coil resonates in the up and down direction in the case inner
space. The lower surface of the case is sealed by an elastic plate which can be bent and
expanded. The bottom portion of the magnetic circuit portion is connected to a substantially
central portion of the elastic plate. In the elastic plate portion outside the connection portion
between the magnetic circuit portion and the elastic plate, an air circulation hole through which
the air is circulated through the elastic plate is opened. The elastic plate is configured to resonate
in the vertical direction or the like in substantially the same cycle as that of the magnetic circuit
portion, substantially in synchronization with the resonant vibration of the magnetic circuit
portion. In the vibration speaker having such a configuration, when the magnetic circuit portion
is resonantly vibrated in the case inner space in the vertical direction or the like, the magnetic
circuit portion performs resonant vibration with a large amplitude width in the vertical direction
or the like. And the elastic plate coupled to the bottom of the magnetic circuit unit. At the same
time, the elastic plate supporting the magnetic circuit unit, which is connected to the bottom of
the magnetic circuit unit, keeps the amplitude direction of the magnetic circuit unit that
resonates and vibrates inside the case kept substantially constant. Posture stabilizes. Then, the
amplitude direction and the amplitude width of the magnetic circuit unit are equalized. Then, the
magnetic circuit portion that resonates and vibrates inside the case is prevented from colliding
with the inner wall of the case, the stopper inside the case, and the like. On the other hand, since
the bottom of the magnetic circuit portion is connected to the substantially central portion of the
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flexible elastic plate which can be bent and expanded, it is feared that the resonant vibration of
the magnetic circuit portion in the vertical direction or the like is interrupted by the elastic plate.
There is no.
Therefore, in the speaker having such a configuration, the thickness and the outer diameter of
the magnet and yoke constituting the magnetic circuit portion supported on the inner side of the
case are formed to be as large as the length of the inner space of the case and the inner
circumferential diameter thereof. it can. Then, the weight of the magnetic circuit portion can be
increased, and the inertial force of the magnetic circuit portion to be resonantly oscillated can be
increased. Then, the magnetic circuit portion can be resonantly vibrated in the vertical direction
or the like inside the case. At the same time, in addition to the vibrational energy stored in the
magnetic circuit unit to be resonated and oscillated, it is connected to the bottom of the magnetic
circuit unit and substantially tuned to the resonant vibration of the magnetic circuit unit and
substantially the same cycle as the magnetic circuit unit. Vibration energy can also be stored on
an elastic plate that resonates in the vertical direction or the like. Then, the total amount of
vibrational energy stored in both of the magnetic circuit portion and the elastic plate can be
increased. Then, most of the vibrational energy stored in both of the magnetic circuit unit and the
elastic plate can be effectively used for the consumption energy for vibrating the housing or the
like of the portable telephone through the case or the like. Then, the housing or the like of the
mobile phone can be vibrated strongly. In the vibration speaker of the present invention, the
bottom portion of the magnetic circuit portion may be connected to a substantially central
portion of the elastic plate opposed thereto through an inertia member having a specific gravity
larger than that of the yoke. In such a case, the weight of the magnetic circuit can be increased
by the amount of the specific gravity inertia member connected to the bottom of the magnetic
circuit. And, the inertial force of the magnetic circuit portion which resonates and vibrates in the
vertical direction and the like in the case inner space can be increased. Then, the vibration energy
stored in the magnetic circuit portion can be increased, and the vibration energy can cause the
housing of the portable telephone to vibrate more strongly. Further, it is preferable that the yoke
portion excluding the magnetic flux flow passage portion of the yoke is formed by an inertia
member having a specific gravity larger than that of the magnetic flux flow passage portion. In
such a case as well, the weight of the magnetic circuit portion can be increased by the inertia
member with high specific gravity which forms the yoke portion excluding the magnetic flux flow
passage portion of the magnetic circuit portion. And, the inertial force of the magnetic circuit
portion which resonates and vibrates in the vertical direction and the like in the case inner space
can be increased. Then, the vibration energy stored in the magnetic circuit portion can be
increased, and the vibration energy can cause the housing of the portable telephone to vibrate
more strongly.
Preferably, a peripheral portion of the elastic plate located outside by a predetermined distance
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from the connection point between the elastic plate and the magnetic circuit portion is fixed to
the case via a rigid ring plate. Then, it is preferable that the air circulation holes passing through
both the rigid ring plate and the elastic plate overlapping it be provided continuously. Further,
the elastic plate portion capable of expansion and contraction and bending inside the rigid ring
plate is substantially synchronized with the resonance vibration of the magnetic circuit portion
without being disturbed by the rigid ring plate, and substantially the same as the magnetic circuit
portion. It is preferable to select and configure the hole shape inside the rigid ring plate, the
elastic force of the elastic body, and the like so as to resonate and vibrate in the vertical direction
and the like in the cycle. In such a case, the fragile case of the miniaturized and thinned vibration
speaker can be reinforced by a wide rigidity ring so as not to be damaged even by an impact
from a drop or the like. In addition, the lower surface of the case sealed by the elastic plate can
be stably fixed to the housing of the mobile phone or the like through the wide rigid ring. The air
circulation holes provided by penetrating both in the peripheral portion of the rigid ring plate
and the elastic plate overlapping it are holes for circulating air through the elastic plate to the
inside and the outside of the case so that the elastic plate resonates. It can be used as a receiver
hole for transmitting the sound emitted from the vibrating cone vibrated to the outside of the
lower surface of the case sealed with the elastic plate. In the vibration speaker of the present
invention, it is preferable that the projection provided on the magnetic circuit portion be slidably
fitted in a recess provided on the inner wall of the case. Then, due to the protrusion of the
magnetic circuit portion and the recess of the inner wall of the case, the magnetic circuit portion
rotates too large in forward and reverse inside the case, or the magnetic circuit portion moves
excessively in the circumferential direction of the case inside the case. It is better to incorporate a
stopper mechanism to prevent the In such a case, when the vibration speaker is dropped to a
floor surface or the like and a large impact force is applied to the magnetic circuit portion
supported via the gimbal inside the case, the magnetic circuit portion is reversed in the inner
space of the case. The above-mentioned stopper mechanism can prevent the rotation of the
magnetic circuit portion from being excessively large and the magnetic circuit portion from
moving excessively in the circumferential direction of the case in the case inner space. Then, it is
possible to prevent the gimbal supporting the magnetic circuit portion in the inner space of the
case from being largely curved or the like to cause plastic deformation or the like which can not
be recovered. At the same time, as the magnetic circuit portion resonates and vibrates in the
vertical direction and the like, the protrusion of the magnetic circuit portion can be slid in the
vertical direction and the like inside the recess of the inner wall of the case.
And it can prevent that the protrusion of the magnetic circuit part inserted in the recessed part of
the case inner side wall prevents the resonance vibration of a magnetic circuit part. In the
vibration speaker according to the present invention, instead of incorporating the above stopper
mechanism, the case is formed into an elliptical cylindrical shape or a shape close to it, and
according to it, the yoke is shaped into an oval shape or close thereto Preferably, the peripheral
side wall of the yoke is disposed near the case inner side wall with a small gap between the case
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inner side wall and the yoke. Then, due to the peripheral side wall of the yoke and the inner side
wall of the case, the magnetic circuit portion may rotate excessively forward and backward inside
the case excessively, or the magnetic circuit portion may move excessively around the case inside
the case. It is good to incorporate a stopper mechanism that prevents In such a case, in the same
manner as described above, when the vibration speaker is dropped to the floor or the like and a
large impact force is applied to the magnetic circuit portion supported via the gimbal inside the
case, the magnetic circuit portion is on the inside of the case The above-mentioned stopper
mechanism can prevent the forward and reverse rotation of the space in the space and the
movement of the magnetic circuit portion in the case inner space in the circumferential direction
of the case. Then, it is possible to prevent the gimbal supporting the magnetic circuit portion in
the inner space of the case from being largely curved or the like to cause plastic deformation or
the like which can not be recovered. Moreover, in such a case, it is not necessary to provide a
protrusion in the magnetic circuit portion or to provide a recess for fitting in the protrusion on
the inner side wall of the case, simplifying the structure of the magnetic circuit portion and the
case to assemble the vibration speaker. Can be simplified. In the vibration speaker according to
the present invention, the same magnetic circuit as the upper stopper prevents the magnetic
circuit supported inside the case via the gimbal from moving excessively upward in the case
inner space. It is good to provide with a lower stopper which prevents moving too much
downward in inner space. The rigid ring plate may be used for the lower stopper. In such a case,
when the vibration speaker is dropped to a floor surface or the like, and a large impact force is
applied to the magnetic circuit portion supported via the gimbal inside the case, the magnetic
circuit portion is upward or downward in the case inner space. The upper stopper and the lower
stopper can prevent excessive movement of the lens. Then, it is possible to prevent the gimbal
supporting the magnetic circuit portion in the case inner space from being largely bent in the
vertical direction or causing plastic deformation or the like that can not be recovered. 1 and 2
show a preferred embodiment of a vibration speaker according to the present invention, FIG. 1 is
a front sectional view thereof, and FIG. 2 is a plan sectional view thereof.
3 and 4 show another preferred embodiment of the vibration speaker according to the present
invention, FIG. 3 is a front sectional view thereof, and FIG. 4 is a plan sectional view thereof.
Below, these vibration speakers are explained. In the illustrated vibration speaker, a short
cylindrical case 10 having an open top and bottom made of reinforced ABS resin containing glass
fiber is provided, and the upper surface of the case is covered with a vibration cone 20 that emits
sound. There is. In the vibration speakers of FIGS. 1 and 2, the case 10 is formed in a short
cylindrical shape. In the vibration speakers shown in FIGS. 3 and 4, the case 10 is formed in a
short oval cylinder shape or a shape close thereto. A small cylindrical voice coil 22 is provided in
a projecting manner substantially at the center of the rear surface of the vibrating cone 20. In an
inner space of the case 10 inside the vibration cone 20, a magnetic circuit unit 30 including a
yoke 34 on which the magnet 32 is mounted is disposed. In the vibration speakers shown in
FIGS. 1 and 2, the yoke 34 housed inside the cylindrical case 10 is formed in a substantially disk
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shape or a shape close thereto. In the vibration speakers shown in FIGS. 3 and 4, the yoke 34
housed inside the case 10 having an elliptical cylindrical shape or a shape close thereto is formed
in an elliptical shape or a shape close thereto. The peripheral side wall of the yoke 34 is disposed
near the inner side wall of the case 10 with a small gap between the case 10 and the inner side
wall of the case 10. The voice coil 22 is loosely fitted in the groove 36 formed between the
magnet 32 of the magnetic circuit portion and the yoke 34 so that the voice coil 22 can vibrate
in the vertical direction or the like. The yoke 34 is formed of soft iron or the like having high
permeability. From the yoke 34, a gimbal 40 made of an elastic material such as phosphor
bronze is extended around the yoke 34. In the vibration speakers of FIGS. 1 and 2, the yoke 34 is
vertically separated at the approximate center thereof, and the inner peripheral edge of the
gimbal 40 is held between the separated yokes 34. The yokes 34 separated at the top and the
bottom are connected to each other by pressing one convex portion at the center thereof into the
other concave portion. In the vibration speakers shown in FIGS. 3 and 4, the inner peripheral
edge of the gimbal 40 is bonded or welded to the upper surface of the yoke 34. Then, gimbals 40
are extended around the yokes 34. The three or two tip portions 42 protruding from the outer
peripheral edge of the gimbal are adhered and fixed to the step surface 12 formed inside the case
10 as shown in FIG. 2 or 4. The tip end portion 42 of the gimbal may be integrally embedded and
fixed to the inner side wall of the case 10.
Then, as shown in FIG. 1 or FIG. 3, the magnetic circuit unit 30 is supported so as to be capable
of vibrating in the vertical direction or the like in the space inside the case 10 through the gimbal
40. At least one of the gimbal 40 or the yoke 34 (both are shown in the figure), as shown in FIG.
2 or FIG. 4, between the upper space and the lower space inside the case 10 partitioned by the
gimbal or yoke And an air flow passage 50 for circulating air. The magnetic circuit unit 30 is
configured to be able to resonate in the vertical direction or the like inside the case 10. The
weight, size, shape, etc. of the magnetic circuit unit 30 and the weight, size, shape, and the like of
the magnetic circuit unit 30 are factors determining the resonant vibration frequency value of
the magnetic circuit unit 30 supported inside the case 10 through the gimbal 40. The elastic
force or the like is a low frequency current of a sinusoidal low frequency current of, for example,
100 to 170 Hz flowing through the voice coil 22 or a waveform close thereto, and a voice
waveform current to be flowed to the voice coil 22 when generating sound in the vibrating cone
20 The magnetic circuit unit 30 is adjusted such that it resonates in the vertical direction or the
like inside the case 10 by receiving a magnetic force acting between the magnetic circuit unit and
the voice coil 22 by a lower frequency current lower than that of the magnetic circuit unit 30. .
The lower surface of the case 10 is sealed by an elastic plate 60 which can be bent and
expanded. As the elastic plate 60, a rubber plate made of silicon or the like, a metal spring plate,
a plate made of a polymer material such as a resin, or the like is used. The substantially central
portion of the elastic plate 60 has a magnetic circuit portion 30 which is formed on the bottom
portion 38 located substantially at the central portion of the lower surface of the magnetic circuit
portion opposed thereto as shown in FIG. It is connected via an inertia member 90 made of
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tungsten, beryllium, copper or the like which has a specific gravity larger than that of a high soft
iron or the like yoke 34. As shown in FIG. 1 or FIG. 3, a rigid ring plate 100 made of metal or the
like is provided around the elastic plate 60 located a predetermined distance outside of the
connection point between the elastic plate 60 and the magnetic circuit unit 30. It is being fixed to
case 10 via. In the peripheral portion of the rigid ring plate 100 and the elastic plate 60
overlapping it, an air circulation hole 70 for circulating air through the elastic plate 60 to the
inside and the outside of the case 10 is continuously provided through both. Then, as shown by
the broken line in FIG. 1 or FIG. 3, the elastic plate 60 portion which can extend and contract and
bend inside the rigid ring plate 100 is not disturbed by the rigid ring plate 100, and It is
configured to resonate in the vertical direction or the like in substantially the same cycle as that
of the magnetic circuit portion in substantially the same manner as the resonant vibration.
The hole shape on the inner side of the rigid ring plate 100 and the weight, size, shape, elastic
force, etc. of the elastic plate 60 are factors that determine the resonant vibration frequency
value of the elastic plate 60 portion inside the rigid ring plate 100. The plate 60 portion is
adjusted so as to resonate in the vertical direction or the like inside and outside the case 10 in
substantially the same cycle as the magnetic circuit portion, substantially in synchronization with
the resonant vibration of the magnetic circuit portion 30. A fragile case 10 made of a resin which
is miniaturized and thinned is reinforced by a wide rigid ring plate 100 so as not to be damaged
even if it receives an impact due to a drop or the like. Further, the lower surface of the case 10
sealed by the elastic plate 60 can be stably fixed to the housing 80 or the like of the mobile
phone via the wide rigid ring plate 100. The air circulation hole 70 continuously penetrating the
rigid ring plate 100 and the surrounding portion of the elastic plate 60 overlapping it allows the
air to flow in and out of the case 10 through the elastic plate 60 so that the elastic plate 60
resonates. And a receiver hole for transmitting the sound emitted from the vibrating cone 20
outward of the lower surface of the case 10 sealed by the elastic plate 60. In the vibration
speakers of FIGS. 1 and 2 or the vibration speakers of FIGS. 3 and 4, when the peripheral side
wall of the case is thick and strong, the rigid ring plate 100 is not provided. The case 10 may be
directly fixed to the housing 80 or the like of the mobile phone via the elastic plate 60 or the like.
In that case, the air flow hole 70 may be provided in the elastic plate 60 portion outside the
connection portion between the magnetic circuit unit 30 and the elastic plate 100. The vibration
speakers of FIGS. 1 and 2 or the vibration speakers of FIGS. 3 and 4 are configured as described
above, and in this vibration speaker, the voice coil 22 has a sine low of, for example, 100 to 170
Hz. The magnetic circuit unit 30 supported in the inner space of the case 10 via the gimbal 40
can be resonantly oscillated in the vertical direction or the like inside the case 10 by supplying a
low frequency current having a waveform close to that or a high frequency current. At the same
time, the elastic plate 60 connected to the bottom portion 38 of the magnetic circuit portion is
substantially tuned to the resonant vibration of the magnetic circuit portion 30 as shown by the
broken line in FIG. Resonant vibration can be made in and out of the case 10 in the same cycle.
Then, the vibrational energy stored in the magnetic circuit unit 30 and the elastic plate 60 can be
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transmitted to the housing 80 or the like of the portable telephone to which the case 10 is fixed
via the gimbal 40 or the case 10 or the like.
Then, the housing 80 or the like of the mobile phone can be vibrated. At that time, the elastic
plate 60 connected to the bottom portion 38 of the magnetic circuit unit can suppress that the
magnetic circuit unit 30 resonates and vibrates with a large amplitude width in the vertical
direction and the like inside the case 10. At the same time, the amplitude direction of the
magnetic circuit unit 30 that resonates and vibrates inside the case 10 is held approximately
stably in a stable manner by the elastic plate 60 connected to the magnetic circuit unit and
supporting the magnetic circuit unit. Can. Then, the attitude of the magnetic circuit unit 30 can
be stabilized, and the amplitude direction and amplitude width of the magnetic circuit unit 30
can be equalized. Then, the magnetic circuit unit 30 that resonates and vibrates inside the case
10 can be prevented from colliding with the inner side wall or the like of the case 10. On the
other hand, the magnetic circuit unit 30 is connected to and supported by the substantially
central portion of the elastic plate 60 which can be bent and expanded, so that the resonance
vibration of the magnetic circuit unit 30 in the vertical direction is interrupted by the elastic
plate 60. There is no risk of At the same time, since the air flow passage 50 and the air
circulation hole 70 are opened in the yoke 34, the gimbal 40 and the elastic plate 60 of the
magnetic circuit portion, the magnetic circuit portion 30 and the elastic plate 60 There is no
possibility that the resonance vibration may be disturbed due to the resistance of air inside or
outside the case 10. Therefore, in the speaker having such a configuration, the thickness and the
outer diameter of the magnet 32 and the yoke 34 that constitute the magnetic circuit unit
supported inside the case 10 are between the inner side wall and the like of the case 10 facing it.
For example, a small gap such as 0.1 mm may be formed to increase the length of the inner
space of the case 10 and the inner circumferential diameter thereof. Then, the weight of the
magnetic circuit unit 30 can be increased, and the inertial force of the magnetic circuit unit 30
can be increased. Then, the magnetic circuit unit 30 can be resonantly vibrated in the vertical
direction or the like inside the case 10. At the same time, in addition to the vibrational energy
stored in the magnetic circuit unit 30 that resonates and vibrates, it is connected to the bottom
38 of the magnetic circuit unit and substantially synchronized with the resonant vibration of the
magnetic circuit unit 30. Vibration energy can also be stored on the elastic plate 60 that
resonates in the vertical direction or the like in substantially the same cycle. Then, the total
amount of vibrational energy stored in both of the magnetic circuit unit 30 and the elastic plate
60 can be increased. Then, most of the vibrational energy stored in both of the magnetic circuit
unit 30 and the elastic plate 60 can be effectively used for energy consumption for vibrating the
housing 80 etc. of the portable telephone via the gimbal 40 and the case 10 etc. .
Further, the weight of the magnetic circuit unit 30 can be increased by the large specific gravity
inertia member 90 connected to the bottom portion 38 of the magnetic circuit unit. Then, it is
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possible to increase the inertial force of the magnetic circuit unit 30 that is resonantly vibrated in
the vertical direction or the like in the inner space of the case 10. Then, the vibration energy
stored in the magnetic circuit unit 30 can be increased, and the housing 80 of the portable
telephone can be strongly vibrated by the vibration energy. In the vibration loudspeakers of FIGS.
1 and 2, or the vibration loudspeakers of FIGS. 3 and 4, in order to simplify the structure, as
shown in FIG. 5, the bottom portion 38 of the magnetic circuit portion is convex. It is also
possible to directly connect the bottom 38 of the elastic plate 60 substantially to the center
without the inertia member 90. Or, conversely, it is possible to make the substantially central
portion of the elastic plate 60 project in a convex shape, and to connect the central portion
directly to the bottom portion 38 of the magnetic circuit portion. In the case of the vibration
speakers shown in FIGS. 1 and 2 or the vibration speakers shown in FIGS. 3 and 4, for example, a
sinusoidal low frequency current of 100 to 170 Hz or a low frequency current having a
waveform close thereto flows in the voice coil 22. Weight of the magnetic circuit 30, the gimbal
40 and the elastic plate 60 so that the magnetic circuit 30 supported inside the case 10 via the
gimbal 40 and the elastic plate 60 connected thereto resonate in the vertical direction etc. When
the voice waveform current, which is complexly changed within the wide frequency range of 200
to 10000 Hz higher than the low frequency current, is supplied to the voice coil 22 because the
size, elasticity, etc. are adjusted. The voice coil 2 has a vibrating cone 20 with a voice coil 22
protruding from the magnetic circuit unit 30 and the elastic plate 60 without causing resonant
vibration. The magnetic force acting between the second and second magnetic circuits 30 and 30
can vibrate in the vertical direction or the like according to the waveform of the voice waveform
current. And sound can be generated from the vibration cone 20. The sound emitted from the
vibrating cone 20 is transmitted to the upper side of the case 10 in front of the vibrating cone
20, or a receiver hole serving as an air circulation hole 70 continuously provided to the rigid ring
plate 100 and the elastic plate 60 overlapping it. Through the case 10 below. In the vibration
speaker of FIG. 1 and FIG. 2 or the vibration speakers of FIG. 3 and FIG. 4, as shown in FIG. 6, the
yoke 34 part excluding the flux flow passage portion 35 of the yoke located around the magnet
32. Preferably, the magnetic flux flow passage portion 35 is formed of an inertial member such
as tungsten, beryllium, copper or the like having a specific gravity larger than that of soft iron or
the like having a high permeability.
Then, it is preferable to increase the weight of the magnetic circuit unit 30 by an inertia member
having a large specific gravity which forms the yoke 34 portion excluding the magnetic flux flow
passage portion 35 of the magnetic circuit unit. Then, it is preferable to increase the inertial force
of the magnetic circuit unit 30 that is resonantly vibrated in the vertical direction or the like in
the inner space of the case 10. Then, it is preferable that the vibration energy stored in the
magnetic circuit unit 30 be increased, and the case 80 of the portable telephone can be strongly
vibrated by the vibration energy. In the amplitude speaker of FIGS. 1 and 2, as shown in FIG. 2, a
protrusion 33 is provided on the periphery of the yoke 34 of the magnetic circuit portion and the
like, and the protrusion 33 is a recess provided on the inner wall of the case. It is good to be able
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to slide in 14 in the up-down direction etc. so that sliding is possible. Then, the magnetic circuit
portion 30 rotates excessively forward and backward inside the case 10 excessively by the
projection 33 of the magnetic circuit portion and the concave portion 14 of the case inner side
wall, or the magnetic circuit portion 30 of the case 10 A stopper mechanism 110 may be
incorporated to prevent excessive movement in the circumferential direction. When the vibration
speaker is dropped to a floor surface or the like and a large impact force is applied to the
magnetic circuit unit 30 supported inside the case 10 via the gimbal 40, the magnetic circuit unit
30 is positive in the case 10 inner space. On the contrary, the stopper mechanism 110 may
prevent the magnetic circuit unit 30 from excessively rotating in the inner space of the case 10
and excessively moving in the circumferential direction of the case 10 in the inner space of the
case 10. At the same time, it is preferable that the protrusion 33 of the magnetic circuit portion
can slide in the vertical direction or the like inside the recess 14 of the inner wall of the case as
the magnetic circuit portion 30 resonantly vibrates in the vertical direction or the like. And it is
good to prevent that the projection 33 of the magnetic circuit part inserted in the recessed part
14 of the inner wall of the case prevents the resonance vibration of the magnetic circuit part 30.
In the vibration speakers shown in FIGS. 3 and 4, the case 10 is formed in or near the shape of an
elliptical cylinder, and the yoke 34 housed inside thereof is shaped in or near the oval disk
according to it. The peripheral side wall of the yoke 34 is disposed near the inner side wall of the
case 10 with a small gap between the inner side wall of the case 10 and the inner side wall of the
case 10. Therefore, in the vibration speakers of FIG. 3 and FIG. 4, the magnetic circuit unit 30
rotates too largely in forward and reverse directions inside the case 10 or around the side wall of
the yoke 34 and the inner side wall of the case 10. The stopper mechanism 112 can be used in
place of the stopper mechanism 110 described above, which prevents the portion 30 from
moving excessively in the circumferential direction of the case 10 inside the case 10.
When the vibration speaker is dropped to a floor surface or the like using the stopper mechanism
112 and a large impact force is applied to the magnetic circuit unit 30 supported via the gimbal
40 inside the case 10, the magnetic circuit unit The magnetic circuit unit 30 is supported by
rotating the magnetic circuit unit 30 excessively large in the inner space of the case 10 or
moving the magnetic circuit unit 30 excessively in the circumferential direction of the case 10 in
the inner space of the case 10. Thus, it is possible to prevent the gimbal 40 from being largely
bent or the like to cause plastic deformation or the like which can not be recovered. At the same
time, it is possible to simplify the structure of the vibration speaker by omitting the provision of
the protrusion 33 and the recess 14 for the stopper mechanism 110 on the inner side wall of the
magnetic circuit unit 30 and the case 10. In the case of the vibration speakers of FIGS. 1 and 2 or
the vibration speakers of FIGS. 3 and 4, when there is a space in the inside of the case 10 or the
like, as shown in FIG. 1, 5 or 6, The upper stopper 120 for preventing the magnetic circuit unit
30 from moving excessively upward in the case inner space, butts against the lower surface of
the yoke 34 of the magnetic circuit unit, etc. The lower stopper 130 may be provided to prevent
the magnetic circuit unit 30 from moving excessively downward in the inner space of the case
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10. The upper stopper 120 may be provided in a ring shape or the like in the space inside the
case 10 below the vibrating cone 20. For the lower stopper 130, the above-described rigid ring
plate 100 may be used. When the vibration speaker is dropped to a floor surface or the like and a
large impact force is applied to the magnetic circuit unit 30 supported inside the case 10 via the
gimbal 40, the magnetic circuit unit 30 is located above the case 10 inside space. The upper
stopper 120 and the lower stopper 130 move so that the gimbal 40 supporting the magnetic
circuit portion 30 is greatly bent in the vertical direction or the like so that the plastic
deformation or the like can not be recovered. Better to prevent. In the vibration speaker shown in
FIGS. 1 and 2 or the vibration speakers shown in FIGS. 3 and 4, the bottom portion 38 of the
magnetic circuit portion is connected to and supported by the elastic plate 60, and the magnetic
circuit portion 30 is the case 10. The elastic plate 60 has a structure capable of suppressing large
rotation in the forward and reverse directions in the inner space and large movement in the
circumferential direction, the vertical direction, and the like. Therefore, in some cases, the
stopper mechanism 110, the upper stopper 120 or the lower stopper 130 may not be provided.
Instead, when the vibration speaker is dropped to the floor or the like and a large impact force is
applied to the magnetic circuit unit 30 supported via the gimbal 40 inside the case 10, it is
connected to the bottom 38 of the magnetic circuit unit. With the elastic plate 60, the magnetic
circuit unit 30 rotates forward and backward excessively in the inner space of the case 10, the
magnetic circuit unit 30 moves excessively in the circumferential direction of the case 10 in the
inner space of the case 10, or If the magnetic circuit unit 30 moves excessively upward or
downward and the gimbal 40 supporting the magnetic circuit unit 30 is largely bent or bent,
plastic deformation or the like becomes impossible to recover. You can prevent it.
As described above, according to the vibration speaker of the present invention, the magnetic
circuit portion can be made to resonate and vibrate with a large inertial force and a strong force
in the space inside the case. At the same time, the vibrational energy stored in both the magnetic
circuit portion and the elastic plate can be efficiently and efficiently transmitted to the housing of
the portable telephone and the like. Then, it is possible to provide a vibration speaker having a
powerful vibrator function with sufficient response. Further, the amplitude width of the magnetic
circuit portion to be resonantly vibrated inside the case can be suppressed in the vertical
direction and the like. Then, it is possible to properly prevent that the magnetic circuit portion
collides with the inner wall of the case, the stopper inside the case, and the like to generate
unpleasant noise. At the same time, the case that accommodates the magnetic circuit portion can
be made thinner and smaller. Then, it is possible to provide a thin and compact vibration speaker.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a front cross-sectional view of a vibration
speaker of the present invention. FIG. 2 is a plan sectional view of the vibration speaker of the
present invention. FIG. 3 is a front sectional view of the vibration speaker of the present
invention. FIG. 4 is a plan sectional view of the vibration speaker of the present invention. FIG. 5
is a front sectional view of the vibration speaker of the present invention. FIG. 6 is a front crosssectional view of the vibration speaker of the present invention. [Description of the code] 10 Case
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20 Vibration cone 22 Voice coil 30 Magnetic circuit part 32 Magnet 34 Yoke 36 Groove 40
Gimbal 50 Air flow passage 60 Elastic plate 70 Air flow hole 80 Body 90 Inertia member 100
Rigid ring plate 110, 112 Stopper mechanism 120 upper stopper 130 lower stopper
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