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JP2004064169

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DESCRIPTION JP2004064169
The present invention provides a vibration speaker capable of causing strong resonance vibration
with a large amplitude width. A gimbal 40 made of an elastic material extends from a
substantially central portion of an outer peripheral surface of a yoke 34 of a magnetic circuit
portion, and a tip portion of the gimbal is fixed inside the case 10. The magnetic circuit unit 30
mainly performs weight, size, and size of the magnetic circuit unit 30 so that resonant vibration
is vertically oscillated in the inner space of the case 10 by a 100-170 Hz sinusoidal current
flowing through the voice coil 22 or a waveform current close thereto. The shape and gimbal 40
are mainly adjusted in weight, size, shape and elastic force. In the surface of the gimbal 40 or the
yoke 34, a flow passage 50 for circulating the air in the case 10 is opened between the upper
inner space and the lower inner space of the case 10 partitioned by the gimbal or the yoke.
[Selected figure] Figure 1
Vibration speaker and mounting structure thereof
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
vibration speaker for use in a cellular phone or the like, in which a speaker emitting sound also
plays a role of a vibrator emitting vibration. [0002] As the vibration speaker, there is a speaker
described in the specification and drawings of Japanese Patent Application No. 2001-050445. In
this speaker, a low-frequency sine wave current of 250 Hz or less or a waveform having a
waveform close to that is applied to the voice coil provided on the back side of the vibrating cone
provided on the upper surface of the case to provide elasticity in the case inner space. Resonant
vibration can be generated in the magnetic circuit portion supported via the plate. And the
resonance vibration which arose in the magnetic circuit part which consists of a yoke in which
the heavy magnet is mounted can be transmitted to the speaker mounting part with which the
case was mounted | worn. On the other hand, when a voice waveform current that changes in a
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complex frequency range of 200 to 10000 Hz is applied to the voice coil, resonant vibration is
applied to the magnetic circuit portion supported via the elastic plate in the case inner space.
Without raising it, the vibrating cone in which the voice coil is provided can be vibrated strongly
according to the waveform of the voice waveform current. And sound can be generated from the
vibration cone. [0003] However, when the above-mentioned speaker is used for a vibrator such
as a portable telephone, the vibration of the conventional general-purpose eccentric weight is
compared with the vibration motor which causes the vibration by rotating. The width was small,
and sufficient strong vibration with sufficient response was not obtained. By the way, the said
vibration speaker incorporated in a mobile telephone etc. is required size reduction and weight
reduction. For example, in the case of a speaker for a mobile phone, there are many short
cylindrical shapes having a diameter of 16 mm and a thickness of 4.1 mm. In order to cause
resonance oscillation with a large amplitude width in such a magnetic circuit unit supported in a
narrow case inner space of a small speaker via an elastic plate, the thickness in the vertical
direction of the magnetic circuit unit is formed thin Thus, it is conceivable to configure the
magnetic circuit portion so as to be able to vibrate with a large amplitude width in the vertical
direction in the case inner space. However, in such a case, the weight of the magnetic circuit unit
is lightened, and the magnetic circuit unit can not be resonantly vibrated by force with a large
inertia force in the space inside the case. And, from such a speaker configured, strong vibration
with sufficient response can not be obtained.
Further, when the magnetic circuit portion is formed thin, the inertial force applied to the
magnetic circuit portion is reduced, and the resonance frequency of the magnetic circuit portion
is increased. Then, even if a low frequency current of 250 Hz or less is supplied to the voice coil
of the speaker, the magnetic circuit unit does not resonate and vibrate. Therefore, as a result of
repeated studies, the present inventors have found that, in the above-described conventional
vibration speaker, the magnetic circuit portion can not be resonantly oscillated with a large
amplitude width in the vertical direction in the narrow case inner space. The lower surface of the
magnetic circuit portion is covered with the first elastic plate, and the case inner space under the
magnetic circuit portion is formed by the first elastic plate and the second elastic plate or a
connecting member connecting the elastic plates. I discovered that it was because it was heavily
blocked. And it was discovered that it is because it is not disturbed by those 1st elastic board, the
2nd elastic board, and the connecting member, and it is because it can not make a magnetic
circuit part resonant oscillation large in amplitude with little resistance in the lower inside space
of the case. . In addition, it has been discovered that the strong resonance vibration generated in
the magnetic circuit unit is suppressed by being disturbed by the elastic force of the first elastic
plate covering the lower surface of the magnetic circuit unit. Then, the first elastic plate, the
second elastic plate, and the connecting member that prevent or suppress such resonant
oscillation with a large amplitude width in the lower inner space of the case as described above
may be used as a magnetic circuit. It has been discovered that the magnetic circuit portion can be
resonantly oscillated with a large amplitude width in the vertical direction in the case inner space
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even if it is a narrow case inner space by excluding it from the lower surface of the part or the
lower inner space of the case. Then, the vibration motor having a sufficiently responsive
structure in which the first elastic plate, the second elastic plate, and the connecting member
which disturb the resonance vibration of the magnetic circuit unit are excluded from the lower
surface of the magnetic circuit unit and the lower inner space of the case. We have developed a
speaker that can obtain large and strong vibration with an amplitude width close to In addition to
the above, the inventors of the present invention have also added the case of the vibration
speaker having the above structure or the bottom plate covering the lower surface of the case to
a frame incorporated in a portable telephone or the like via an elastic member. A magnetic circuit
that resonates and vibrates in the case inner space of the vibrating speaker when mounted on a
hard speaker mounting portion such as the inside of the outer case, as compared with the case
where the speaker case or bottom plate is directly mounted on the hard speaker mounting
portion. It has been discovered that the vibration of the magnetic circuit portion can be
transmitted to the speaker mounting portion in a strong state without the vibration of the portion
being attenuated by the hard speaker mounting portion.
Then, based on the discovery, the vibration speaker can be attached to the speaker mounting
portion without being damped by the hard speaker mounting portion, and the vibration of the
magnetic circuit portion resonatingly vibrated in the case inner space of the vibration speaker
can Developed a structure. That is, according to the present invention, a force having a
sufficiently large amplitude width and sufficient strength is obtained by removing a member that
disturbs or suppresses resonance vibration of the magnetic circuit unit from the lower surface of
the magnetic circuit unit or the lower inner space of the case. It is a first object to provide a
vibration speaker that can cause vibration. In addition, the mounting structure of the vibration
speaker capable of transmitting force-wise strongly to the speaker mounting portion without
damping the vibration of the magnetic circuit portion resonating in the case inner space of the
vibration speaker by the hard speaker mounting portion. The second purpose is to provide. In
order to achieve the above object, in the vibration speaker of the present invention, the upper
surface of a cylindrical case standing up in the vertical direction is sealed by a vibration cone,
and A voice coil is provided protruding on the back side, and a magnetic circuit unit consisting of
a yoke on which a magnet is mounted is disposed in a case inner space inner than the cone, and
a magnetic circuit unit is disposed between the magnet and the yoke of the magnetic circuit unit.
In the speaker, in which the voice coil is loosely fitted so as to be capable of vibrating up and
down in the formed loose fitting groove, a gimbal made of an elastic material is extended from a
substantially central portion of the outer peripheral surface of the body of the yoke. The tip of
the gimbal is fixed to the inside of the case, and the magnetic circuit portion is vertically and
vibratably supported in the inner space of the case via the gimbal, and the magnetic circuit
portion is fixed to the front. The main weight, size, and shape of the magnetic circuit portion and
the main weight of the gimbal so that resonant vibration is vertically oscillated in the inner space
of the case due to a 100-170 Hz sinusoidal current flowing through the voice coil or a waveform
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current close thereto. The size, shape and elastic force are adjusted, and the air in the case is
circulated between the upper inner space and the lower inner space of the case partitioned by
the gimbal or the yoke on at least one surface of the gimbal or the yoke. It is characterized in that
the flow passage to be made open. In this vibration speaker, a gimbal made of an elastic material
is extended around substantially the center portion of the outer peripheral surface of the body
portion of the yoke constituting the magnetic circuit portion. The tip of the gimbal is fixed to the
inside of the cylindrical case, and the magnetic circuit portion is vertically and vibratably
supported in the inner space of the case via the gimbal.
That is, in the vibration speaker, the lower and upper portions of the magnetic circuit portion are
not covered with gimbals or covered with gimbals, and the case inner space below and above the
magnetic circuit portions is an obstacle. Not widely open. For that purpose, the magnetic circuit
portion supported in the case inner space through the elastic gimbals is stably stabilized in a
large amplitude width in the case inner space without being hampered by the gimbal etc. Can.
Then, it is possible to provide a vibration speaker capable of obtaining a large strong vibration
with sufficient response. Further, since the gimbal made of an elastic material is extended from
the substantially central portion of the outer peripheral surface of the body of the yoke to the
periphery thereof, the upper portion of the magnetic circuit portion above the gimbal and the
gimbal The weight of the lower magnetic circuit and the lower part of the magnetic circuit can be
distributed almost equally at the gimbal. Then, when the heavy magnetic circuit portion
supported by the gimbal is resonantly vibrated up and down, the gimbal without causing the
magnetic circuit portion to be largely biased and oscillated to either the upper side or the lower
side of the gimbal. In the upper and lower parts of the boundary, the vibration can be oscillated
up and down by stabilizing it with substantially equal amplitude width. Then, because the heavy
magnetic circuit portion is vibrated largely biased upward or downward of the gimbal, an
excessive force is applied upward or downward to the gimbal, and the gimbal exceeds the limit
area of elastic deformation. It is possible to prevent plastic deformation due to large bending or
the like. And, it is possible to prevent the elastic force of the gimbal from being deteriorated
early. In addition, at least one surface of the gimbal or the yoke has a flow passage for passing air
in the case between the upper inner space and the lower inner space of the case partitioned by
the gimbal or the yoke. Therefore, when the magnetic circuit portion supported by the gimbal
inside the case is resonantly vibrated up and down in the case inner space, the gimbal or yoke
that opens between the upper inner space and the lower inner space of the case is opened.
Through the flow passage, the air in the case can be smoothly moved in and out between the
upper inner space and the lower inner space of the case in accordance with the vertical vibration
of the magnetic circuit portion. Then, the resistance of air contained in the upper inner space of
the case surrounded by the vibrating cone, the gimbal and the yoke is made to resonate and
vibrate the magnetic circuit portion to the upper inner space side of the case with a large
amplitude width. Can be prevented.
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And it can prevent that the resonant vibration which generate | occur | produced in the magnetic
circuit part is suppressed. In addition, the weight of the magnetic circuit unit, the elastic force of
the gimbal, and the like so that the magnetic circuit unit resonates vertically in the space inside
the case due to a 100-170 Hz sinusoidal current flowing through the voice coil or a waveform
current close thereto. The magnetic circuit is supported by gimbals in the inner space of the case
when the voice coil is supplied with a voice waveform current that changes in a complex
frequency range of 200 to 10000 Hz, because The voice coil is protruded without generating the
resonant vibration in the magnetic circuit portion which causes the resonant vibration when a
sinusoidal current of 100 to 170 Hz or a waveform having a waveform close thereto flows in the
voice coil. The vibrating cone can be vibrated up and down in accordance with the waveform of
the voice waveform current. And sound can be generated from the vibration cone. In the
vibration speaker of the present invention, the lower surface of the case is sealed by a bottom
plate having a through hole on the surface, and a front side surface including the through hole of
the bottom plate is covered with a flexible elastic plate. In a case where an elastic plate covering
the surface of the through hole is surrounded by the magnetic circuit portion and the bottom
plate at substantially the same cycle as the resonance cycle of the magnetic circuit portion in
accordance with the resonant vibration of the magnetic circuit portion. It is preferable to have a
structure in which mainly the hardness and thickness of the elastic plate and the size of the inner
diameter of the through hole are adjusted so as to resonate and vibrate in the vertical direction
with air in the lower inner space. In that case, the lower surface of the case can be sealed by a
bottom plate having a through hole on the surface and an elastic plate covering the front side
surface including the through hole of the bottom plate. Then, water and the like intrude into the
case inner space in which the magnetic circuit portion and the like are accommodated by the
vibration cone that seals the upper surface of the case, the bottom plate that seals the lower
surface of the case, and the elastic plate covering the through holes in the bottom plate surface.
Can be prevented. And, it becomes possible to provide a vibration speaker having
waterproofness. Also, when the magnetic circuit portion is resonantly vibrated up and down in
the case inner space, the elastic plate covering the surface of the through hole is matched with
the resonant vibration of the magnetic circuit portion to substantially the same cycle as the
resonant cycle of the magnetic circuit portion. Thus, with the air in the lower inner space of the
case surrounded by the magnetic circuit portion and the bottom plate in the upper and lower
portions, resonance vibration can be caused by repeatedly expanding and immersing in and out
the through hole in a dome shape or the like. . Then, the bottom plate covering the lower surface
of the case and the elastic plate covering the upper surface of the bottom plate are disturbed, and
the vibration of the magnetic circuit portion resonating vertically in the case inner space is the
lower portion of the case between the magnetic circuit portion and the bottom plate. It is possible
to prevent the air resistance in the inner space from being greatly received and suppressed.
And it can prevent that the vibration of a vibration speaker is weakened. In the vibration speaker
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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
inner space of the case. A structure provided with a lower stopper that prevents the movement in
the inner space of the case from moving excessively downward, and a detent stopper that
prevents the same magnetic circuit portion from rotating excessively in the inner space of the
case. It is preferable to The lower stopper is preferably a bottom plate that covers the lower
surface of the case. The rotation stopper preferably has a structure having a function to prevent
the magnetic circuit portion supported inside the case via the gimbal from moving excessively in
the horizontal (radial) direction in the inner space of the case. . In that case, when the vibration
speaker falls from a high place to a hard floor surface or the like, and a large inertial force is
applied to the magnetic circuit portion supported via the gimbal in the case inner space of the
vibration speaker In addition, the upper stopper can prevent the heavy magnetic circuit portion
from moving excessively upward in the case inner space. Similarly, the lower stopper can prevent
the heavy magnetic circuit portion from moving excessively downward in the case inner space.
Similarly, the anti-rotation stopper can prevent the heavy magnetic circuit portion from rotating
too much in forward and reverse directions in the case inner space. Then, it is possible to prevent
the gimbal supporting the magnetic circuit portion from being greatly plastically deformed
beyond the limit area of elastic deformation. And, the elastic force of the gimbal can be prevented
from deteriorating. When the lower stopper is a bottom plate for sealing the lower surface of the
case, the lower stopper is provided in the lower inner space of the case, so that the lower stopper
obstructs the lower magnetic circuit portion of the case. It can prevent that it can not be made to
vibrate large amplitude width in inner space. Moreover, since the lower stopper is shared by the
bottom plate, the number of parts of the vibration speaker can be reduced, and the manufacture
of the vibration speaker can be facilitated. Furthermore, the detent stopper has a structure
having a function to prevent the magnetic circuit portion supported by the gimbal in the case
inner space from moving excessively in the horizontal (radial) direction in the inner space of the
case. When the vibration speaker falls from a high place to a hard floor surface, etc. and a large
inertial force in the horizontal direction is applied to the magnetic circuit unit, the heavy
magnetic circuit unit is in the case inside space An excessively large movement in the horizontal
direction can be prevented by the detent stopper.
Then, it is possible to prevent the gimbal supporting the magnetic circuit portion from being
greatly plastically deformed beyond the limit area of elastic deformation. And, the elastic force of
the gimbal can be prevented from deteriorating. The mounting structure of the vibration speaker
of the present invention is characterized in that the case of the vibration speaker of the present
invention or the bottom plate covering the lower surface of the case is mounted to a hard
speaker mounting portion via an elastic member. There is. In the mounting structure of the
vibration speaker, as described above, the vibration of the magnetic circuit portion to be
resonantly vibrated in the inner space of the case, the bottom plate covering the case of the
vibration speaker or the lower surface of the case and the hard speaker mounting portion The
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elastic member interposed between can be transmitted to the hard speaker mounting portion in a
strong state without being attenuated by the hard speaker mounting portion. Then, the speaker
mounting portion can be vibrated by the vibration speaker with a large amplitude and force. In
the vibration speaker mounting structure of the present invention, it is preferable that the elastic
member is the elastic plate that covers the bottom side surface of the bottom plate. In that case,
since the elastic member is shared by the elastic plate covering the bottom surface of the bottom
plate, the number of parts of the mounting structure of the vibration speaker can be reduced, and
the mounting structure of the vibration speaker can be simplified. 1 to 3 show a preferred
embodiment of a vibration speaker according to the present invention, FIG. 1 is a front sectional
view thereof, FIG. 2 is a plan sectional view thereof, and FIG. It is a top view of a gimbal. Below,
this vibration speaker is demonstrated. In the vibration speaker shown in the figure, a short
cylindrical cylindrical case 10, which is vertically erected and made of reinforced ABS resin
containing glass fiber, etc., is provided, and the upper surface of the case is covered by a
vibrating cone 20 that emits sound. ing. 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. The voice coil 22 is loosely fitted so as
to be capable of vibrating in the vertical direction in the loose fitting groove 36 formed between
the magnet 32 of the magnetic circuit portion and the yoke 34. The above configuration is the
same as that of a conventional general-purpose dynamic speaker, but in the vibration speaker
shown in the figure, it is made of an elastic material such as phosphor bronze from about the
center of the outer peripheral surface of the body of the yoke 34. The gimbal 40 is extended.
Specifically, 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. Three tip portions 42 protruding from the
outer peripheral edge of the gimbal are adhered and fixed to a stepped surface formed inside the
case 10. The tip end portion 42 of the gimbal may be integrally embedded and fixed to the inner
side wall of the case 10. The magnetic circuit unit 30 is vertically and vibratably supported in the
inner space of the case 10 through the gimbal 40. At the same time, when the magnetic circuit
unit 30 applies a sinusoidal current of 100 to 170 Hz or a waveform close to it to the voice coil
22, the magnetic action acting between the voice coil 20 and the magnetic circuit unit 30. The
main weight, size, and shape of the magnetic circuit unit 30 and the main weight, size, shape, and
elastic force of the gimbal 40 are adjusted so as to resonate vertically in the inner space of the
case 10. Between the upper inner space and the lower inner space of the case 10 partitioned by
the gimbal or yoke, as shown in FIG. 2, on the surface of at least one of the gimbal 40 or the yoke
34 (both sides in the figure). A flow passage 50 for circulating the air in the case 10 is opened.
The vibration speaker shown in FIGS. 1 to 3 is configured as described above. In this vibration
speaker, the lower part and the upper part of the magnetic circuit unit 30 are covered with the
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gimbal 40 or the gimbal 40 is used. Since the inside space of the case 10 below and above the
magnetic circuit unit 30 is widely opened without an obstacle without being blocked, the inside
space of the case 10 through the gimbal 40 made of the elastic material In the inner space of the
case 10, the magnetic circuit unit 30 supported on the upper surface of the case 10 can be stably
vibrated up and down by making the amplitude width large and stable without being hampered
by the gimbal 40 and the like. Further, since the weight of the upper portion of the magnetic
circuit portion 30 above the gimbal and the lower portion of the magnetic circuit portion 30
below the gimbal are substantially equally distributed at the gimbal 40 as a boundary, When the
heavy magnetic circuit unit 30 supported by the gimbal 40 is resonantly vibrated up and down,
the magnetic circuit unit 30 is stabilized with substantially equal amplitude width above and
below the gimbal 40. , Can be resonant vibration up and down. Then, since the heavy magnetic
circuit unit 30 is vibrated largely biased upward or downward of the gimbal 40, an excessive
force is applied upward or downward to the gimbal 40, and the gimbal 40 is elastically deformed.
It is possible to prevent plastic deformation due to large deflection or the like beyond the limit
area.
When the magnetic circuit unit 30 supported by the gimbal 40 inside the case 10 is resonantly
oscillated in the space inside the case 10, the space between the upper inner space and the lower
inner space of the case 10 is The air in the case 10 is matched to the vertical vibration of the
magnetic circuit unit 30 through the flow passage 50 opened in the gimbal 40 or the yoke 34
that separates, and the resistance between the upper inner space and the lower inner space of
the case 10 is small and smooth You can get in and out of the Then, due to the resistance of air
contained in the upper inner space of the case 10 surrounded by the vibrating cone 20, the
gimbal 40 and the yoke 34, the amplitude of the magnetic circuit unit 30 toward the upper inner
space of the case 10 It is possible to prevent that the resonance vibration can not be made large
and strong. The weight of the magnetic circuit unit 30 and the gimbals are such that the
magnetic circuit unit 30 resonantly vibrates up and down in the inner space of the case 10 by a
100-170 Hz sinusoidal current flowing through the voice coil 22 or a waveform current close
thereto. The gimbal 40 in the case 10 inner space when a voice waveform current which changes
complicatedly in the wide frequency band range of 200 to 10000 Hz is supplied to the voice coil
22 because the elastic force and the like of 40 are adjusted. Is a magnetic circuit unit 30
supported via the magnetic circuit unit 30 that generates a resonant vibration when a sinusoidal
current of 100 to 170 Hz or a waveform having a waveform close to that of the voice coil 22
flows. The vibration cone 20 in which the voice coil 22 is provided can be vibrated up and down
in accordance with the waveform of the voice waveform current without raising it. it can. And
sound can be generated from the vibration cone 20. In this vibration speaker, as shown in FIG. 1,
the lower surface of the case 10 is sealed by a bottom plate 60 having a through hole 62 on the
surface, and the front side surface including the through hole 62 of the bottom plate is bent, It is
good to make it the structure covered by the elastic board 70 which can be expanded-contracted.
At the same time, the elastic plate 70 covering the surface of the through hole 62 is surrounded
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by the magnetic circuit unit 30 and the bottom plate at the same cycle as the resonant circuit of
the magnetic circuit unit 30 in accordance with the resonant vibration of the magnetic circuit
unit 30. Preferably, the hardness and thickness of the elastic plate 70 and the inner diameter of
the through hole 62 are adjusted to resonate with the air in the lower inner space of the case 10.
Specifically, for example, the inner diameter of the through hole 62 opened to the surface of the
bottom plate 60 is about 4 mm, and the surface side of the bottom plate 60 is made of silicone
rubber having a thickness of about 0.2 mm and a rubber hardness of 30. The elastic plate 70
may be attached via the double-sided adhesive tape 64.
In that case, the lower surface of the case 10 can be sealed by the bottom plate 60 having the
through holes 62 on the surface, and the elastic plate 70 covering the front side surface
including the through holes 62 of the bottom plate. The case 10 contains the vibrating circuit 20
for sealing the upper surface of the case 10, the bottom plate 60 for sealing the lower surface of
the case 10, and the elastic plate 70 for covering the surface of the through hole 62 on the
surface of the bottom plate. Water and the like can be prevented from entering the inner space.
Further, when the magnetic circuit unit 30 is resonantly vibrated up and down in the inner space
of the case 10, as shown by the broken line in FIG. 1, the elastic plate 70 covering the surface of
the through hole 62 is a resonant vibration of the magnetic circuit unit 30. In accordance with
the resonance cycle of the magnetic circuit unit, it is repeatedly dome-shaped inside and outside
of the through hole 62 together with the air in the lower inner space of the case 10 surrounded
by the magnetic circuit unit 30 and the bottom plate 60 in substantially the same cycle. It can be
made to resonate and vibrate by bulging or immersing etc. The vibration of the magnetic circuit
portion 30 which is disturbed by the bottom plate 60 sealing the lower surface of the case 10
and the elastic plate 70 covering the bottom surface of the bottom plate and resonates vertically
in the space inside the case 10 is the magnetic circuit portion 30 and the bottom plate. The air
resistance in the lower inner space of the case between 60 and 60 can be prevented from being
greatly received and suppressed. Further, in this vibration speaker, as shown in FIG. 1, the
magnetic circuit portion 30 supported inside the case 10 via the gimbal 40 is moved excessively
large upward in the case 10 inner space. The upper stopper 82 for preventing, the lower stopper
84 for preventing the same magnetic circuit unit 30 from moving excessively downward in the
inner space of the case 10, and the same magnetic circuit unit 30 rotate excessively forward and
reversely in the inner space of the case 10 It is good to have the structure provided with the
rotation stop stopper 86 which prevents that. The upper stopper 82 may be formed of a ringshaped plate disposed at the upper end of the upper inner space of the case 10 to abut and lock
the upper end surface of the yoke 34. The lower stopper 84 may be constituted by a bottom
plate 60 which seals the lower surface of the case 10, which abuts and locks the lower end
surface of the yoke 34. As shown in FIG. 2, the anti-rotation stopper 86 is fitted inside the case
10 with a protrusion 38 extending around the outer periphery of the yoke 34 and a clearance of
about 0.1 mm. It is good to comprise from the fitting part 12 formed. The anti-rotation stopper
86 may have a function to prevent the magnetic circuit unit 30 supported inside the case 10 via
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the gimbal 40 from moving excessively in the horizontal (radial) direction in the space inside the
case 10.
Specifically, for example, when the magnetic circuit unit 30 tries to move excessively in the
horizontal direction in the space inside the case 10, the tip end edge of the protrusion 38 of the
yoke outer peripheral edge of the rotation stopper 86 is the fitting portion inside the case It is
preferable that the magnetic circuit portion 30 be prevented from moving excessively in the
horizontal direction in the inner space of the case 10 by being brought into contact with and
locked to the inner peripheral edge 12 of the case 12. In this case, the vibration speaker falls
from a high place to a hard floor surface, and a large inertial force is generated in the magnetic
circuit unit 30 supported via the gimbal 40 in the case 10 inner space of the vibration speaker.
The upper stopper 82 can prevent the heavy magnetic circuit unit 30 from moving excessively
upward in the space inside the case 10 when it is added. Similarly, the lower stopper 84 can
prevent the heavy magnetic circuit unit 30 from moving excessively downward in the inner space
of the case 10. Similarly, the anti-rotation stopper 86 can prevent the heavy magnetic circuit unit
30 from rotating excessively in the forward and reverse directions in the inner space of the case
10. Then, the gimbal 40 supporting the magnetic circuit unit 30 can be prevented from being
greatly plastically deformed beyond the limit area of elastic deformation. When the lower stopper
84 is the bottom plate 60 sealing the lower surface of the case 10, the magnetic circuit unit 30 is
vibrated by a large amplitude width in the lower inner space of the case 10, being disturbed by
the lower stopper 84. You can prevent it from becoming impossible. Further, since the lower
stopper 84 is shared by the bottom plate 60, the number of parts of the vibration speaker can be
reduced. Furthermore, the rotation stopper 86 also has a function to prevent the magnetic circuit
portion 30 supported inside the case 10 via the gimbal 40 from moving excessively in the
horizontal (radial) direction in the case 10 inner space. In the case of the construction, when the
vibration speaker falls from a high place to a hard floor surface or the like and a large inertial
force in the horizontal direction is applied to the magnetic circuit unit 30, the heavy magnetic
circuit unit The anti-rotation stopper 86 can prevent the horizontal movement of the case 30 in
the inner space of the case 10 by excessively large amounts. Then, the gimbal 40 supporting the
magnetic circuit unit 30 can be prevented from being greatly plastically deformed beyond the
limit area of elastic deformation. Next, a preferred embodiment of the mounting structure of the
vibration speaker of the present invention will be described. FIG. 1 shows the mounting structure.
Below, the mounting structure of this vibration speaker is demonstrated. The mounting structure
of this vibration speaker is a vibration speaker when mounting the vibration speaker shown in
FIG. 1 and the like to a rigid speaker mounting portion 100 such as a frame inside a mobile
phone or inside an outer case of a mobile phone. Shows the mounting structure of. In this
vibration speaker mounting structure, the case 10 of the vibration speaker or a bottom plate (in
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the figure, the bottom plate) 60 for sealing the lower surface of the case is attached to the hard
speaker mounting portion 100 via an elastic member 90 such as a rubber plate. It is attached.
The mounting structure of the vibration speaker shown in FIG. 1 has the above-mentioned
structure, and in the mounting structure of this vibration speaker, as described above, the
magnetic circuit to resonate in the inner space of the case 10 as described above. The vibration
of the portion 30 can be transmitted to the hard speaker mounting portion 100 in a strong state
without being attenuated by the hard speaker mounting portion 100 using the elastic member
90. Then, the speaker mounting portion 100 can be strongly vibrated with a large amplitude
width by the vibration speaker. In this vibration speaker mounting structure, as shown in FIG. 1,
the elastic member 90 may be an elastic plate 70 that covers the surface of the bottom plate 60.
In that case, since the elastic member 90 is also used as the elastic plate 70 covering the bottom
surface of the bottom plate 60, the number of parts of the mounting structure of the vibration
speaker can be reduced. In that case, the speaker mounting portion 100 immediately below the
elastic plate 70 covering the surface of the through hole 62 is provided with the recess 110
widely, and the elastic plate 70 covering the surface of the through hole 62 of the bottom plate is
disturbed by the speaker mounting portion 100 Therefore, it is necessary to prevent the dome
shape etc. from being unable to expand downward. As described above, according to the
vibration speaker of the present invention, the magnetic circuit portion can be resonantly
vibrated with a large amplitude width and force in the case inner space. Then, it is possible to
provide a small speaker having a powerful vibrator function with sufficient response. Therefore,
by incorporating the vibration speaker of the present invention in a mobile phone, the vibration
motor serving as a vibrator can be eliminated from the mobile phone. Since the vibration motor
is not provided, the size, weight and power saving of the mobile phone can be achieved. Further,
according to the mounting structure of the vibration speaker of the present invention, the
resonant vibration generated by the vibration speaker is not attenuated by the rigid speaker
mounting portion such as the frame inside the mobile phone or the outer case of the mobile
phone. It can be transmitted to the speaker mounting portion with a large amplitude width and a
strong state.
Then, it becomes possible to vibrate the speaker mounting portion with a large amplitude width
and strong force. 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 plan view of a gimbal of the vibration speaker of the
present invention. [Description of the code] 10 Case 20 Vibration cone 22 Voice coil 30 Magnetic
circuit part 32 Magnet 34 Yoke 36 Free fitting groove 40 Gimbal 50 Flow passage 60 Bottom
plate 62 Through hole 70 Elastic plate 82 Upper stopper 84 Lower stopper 86 Rotation stopper
90 Elastic Part 100 Speaker mounting part
13-05-2019
11
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