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JP2018504078

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DESCRIPTION JP2018504078
Abstract With the ceramic plate attached to the center of the metal diaphragm diaphragm, it is
output from the acoustic device and amplified while passing through the amplifier so that the
electrical signal of the voice is transmitted through the electrical wire, The other sharp end of the
elastic support piece, one of which is supported by the resonance cylinder to which the metal
diaphragm diaphragm is fixed, enables sound to be amplified without external influences such as
temperature and moisture, etc. The part controls the vibration of the ceramic plate, so that a
stable sound is amplified from high to low, and the ceramic plate is bent around the
circumference of a metal diaphragm diaphragm mounted in the center It is characterized in that
it is configured to form a part and to attenuate distortion frequencies in the middle and high tone
band. [Selected figure] Figure 1
Noncombustible piezoelectric speaker device
[0001]
The present invention relates to a noncombustible piezoelectric speaker device, and more
particularly, in a state in which a ceramic plate is attached to a metal diaphragm diaphragm, in a
resonance cylinder, a pointed end of an elastic support piece which receives elastic force of a
spring. By controlling the vibration, the electrical signal of the sound output from the acoustic
device and amplified while passing through the amplifier and transmitted through the electric
wire is high incombustible as a high quality sound signal from high tone to low tone. The
invention relates to a non-combustible piezoelectric speaker device in which sound is output
through the ceramic plate of metal and the metal diaphragm diaphragm, and sound can be
output without being affected by the temperature and moisture etc. at the time of fire. .
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[0002]
In general, almost all noise present in the surroundings is transmitted in the form of waves.
For example, sound heard in the ear, light entering the eye, electromagnetic waves received by
the television and radio, etc. are transmitted in the form of wave motion.
[0003]
The sound heard by the ear is a wave created by the vibration of the object, and the sound enters
the human ear canal, ie, the hole in the ear, is vibrated by the tympanic membrane, and the cells
in the inner ear of the tympanic membrane are stimulated. It is transmitted to the brain and can
be heard.
[0004]
The range of sounds that can be heard by humans varies depending on the auditory ability, but is
20 to 20,000 Hz, and sounds suitable for human hearing are 125 to 8,000 Hz.
[0005]
Conventionally, there are a cone type, a dome type, a horn type, etc., and the speaker is used
properly according to the use.
Among these, a cone type speaker is generally widely used to have a conical diaphragm, and the
diaphragm is vibrated by passing a drive current to a voice coil disposed on the diaphragm, and
the diaphragm A compression wave (longitudinal wave) is created to output sound (Patent
Document 1 and Patent Document 2).
[0006]
Conventionally, NTX Corporation and others have long developed and put into practical use a
speaker that generates sound by using a flat plate as a diaphragm and vibrating it (for example,
Patent Document 3).
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This type of speaker is lightweight and has the advantage of being easy to install anywhere, but it
is equipped with a cone-shaped woofer, dome-shaped tweeter, and squawker in terms of tone
range, frequency characteristics, and sound reproducibility. Its use has been limited compared to
conventional box-type speakers.
[0007]
Since conventionally used speakers output sound by creating compression waves of air
(longitudinal waves), the propagation of sound is attenuated in proportion to the square of the
distance so that the sound can reach far. Had to generate a large volume of sound.
[0008]
On the other hand, the transverse wave is characterized in that the attenuation factor is very
small compared to the longitudinal wave, and a speaker that allows the sound to reach far is
proposed using this (for example, Patent Document 4).
In the method described above, bending stress is applied to the diaphragm of the speaker, and
this bending generates a transverse wave. However, in this type of technology, a plate-like
member made of wood, plastic, metal or the like is used as the diaphragm, and it is premised that
this plate-like member is bent to generate and apply the bending stress.
[0009]
The speaker converts an electric signal into vibration by an electromagnetic coil or a
piezoelectric element, and emits sound by transmitting vibration to air through a flat panel
(diaphragm).
[0010]
Therefore, when the rigidity of the panel (diaphragm) is small and soft, the panel can not catch
up with the vibration of the vibrator.
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That is, only the periphery of the vibrator vibrates, vibration at most other necessary frequencies
can not be obtained, unnecessary noise is generated, or necessary sound is not output due to
interference. In the case of high-pitched sound (high frequency and rapid vibration), the abovementioned phenomenon appears notably.
[0011]
Therefore, if the panel is made of the plate-like plastic or the like, the above-mentioned
phenomenon becomes remarkable, and the panel, that is, the speaker does not have the
performance to a practical level.
[0012]
On the other hand, if the panel (diaphragm) is made of a hard plate-like member such as metal,
the rigidity of the panel can be increased, but the panel itself becomes too heavy, so the vibrator
vibrates the panel Even if it tries to cause it, the inertia force of the panel becomes too large, and
the panel can not catch up with the vibration of the vibrator.
As a result, the panel reproduces only a partial frequency with respect to the vibration from the
vibrator.
[0013]
Therefore, if the panel is made of the plate-like metal, the above-mentioned phenomenon
becomes remarkable, and the panel, that is, the speaker does not have the performance to a
practical level.
[0014]
The term "piezoelectric element" refers to an element having the property of being able to
change electrical energy and mechanical energy between each other, and the piezoelectric
speaker has such mechanical movement of the piezoelectric element by the diaphragm. It is a
typical product of acoustic components that convert acoustically and generate sound in a desired
frequency band.
[0015]
The piezoelectric speaker includes a piezoelectric element, and a diaphragm that is larger than
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the piezoelectric element, attached to one surface of the piezoelectric element, and that amplifies
a vibration generated by the pressure dividing element.
[0016]
The diaphragm to be applied to the piezoelectric speaker is made of a metal material having a
good sound wave transmission coefficient and Young's modulus (increased elastic modulus), but
the piezoelectric speaker thus has an efficiency to convert the vibration of the piezoelectric
element into the sound wave. It has the advantage of being expensive.
[0017]
However, metals are disadvantageous in that they are thick and heavy because of their inherent
properties.
For this reason, the diaphragm applied to the piezoelectric speaker is only relatively thicker and
heavier than the diaphragm applied to the dynamic speaker formed of a thin synthetic resin
sheet of several tens of microns.
[0018]
The thinner and lighter the diaphragm can generate low frequency band sound, however, the
piezoelectric speaker has a limit in generating low frequency band sound compared to the
dynamic speaker for the reason described above .
[0019]
Thus, Patent Document 5 is proposed, and in the speaker diaphragm including a pair of covering
layers and a core having a foam layer sandwiched therebetween, the foam layer is a
thermosetting resin. A foamable resin composition comprising a resin, a hollow spherical
inorganic substance, and a thermally expandable microcapsule was used, and a bending stress
was applied to the speaker diaphragm.
[0020]
In addition, Patent Document 6 has been proposed, which comprises a storage case opened at
the top, a diaphragm housed in the storage case, and PZT (piezo-electric transducer) made of
ceramic material, and is formed on the upper surface and the lower surface An alternating
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current signal is supplied from an alternating current signal supply unit through the upper
surface silver paste and the lower surface silver paste, and a piezoelectric material is contracted
and expanded to vibrate the diaphragm laminated on the lower portion, and a predetermined size
on the upper surface of the upper surface silver paste The metal plate-like damper, the lid case
coupled to the open top of the storage case, one end coupled to the lid case, the other end
coupled to the diaphragm, and the diaphragm to the lid case And a supporting base configured to
be supported.
[0021]
In addition, Patent Document 7 is proposed, which includes a piezoelectric element, a vibrating
member attached to one side surface of the piezoelectric element, and a case supporting the
periphery of the vibrating member, the vibrating member comprising: An attachment portion to
which the piezoelectric element is attached is formed in a central region, a frame is formed along
the peripheral region, a connecting portion connecting the attaching portion and the frame is
formed, the attachment portion, the frame, and the connection A metal diaphragm in which a
through hole is formed in a portion excluding the object, and a resin diaphragm having a size
corresponding to the size of the metal diaphragm and attached to one surface of the metal
diaphragm By configuring, the weight of the vibrating member is reduced and sound in the low
frequency band can be realized.
[0022]
However, according to the above-described conventional piezoelectric loudspeaker, while the
medium bass can be heard when the method of attaching the damper to the piezoelectric
loudspeaker is used, when the volume is increased, the waveform is distorted at high sound
saturation The phenomenon occurs, and there is a problem that the sound can not be effectively
heard at a large output.
[0023]
In addition, parasitic frequencies are generated in the middle and high tone bands as well as
inability to hear low tones, or distortion of the waveform occurs, so that it is not easy to spread
the middle and high tones.
[0024]
Japan JP 2004-64726 JP Japan JP 2002-78077 JP Japan JP 11-512249 JP Japan JP 200719623 South Korea Registered Patent 10-1159037 (registration date: 2012) June 15, 2015:
Loudspeaker diaphragm and loudspeaker using it Korean Registered Patent 10-12 25 552 (Date
of registration: January 17, 2013, title of the invention: Piezoelectric loudspeaker) Korean
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Registered Patent 10-1057105 (date of registration: August 9, 2011, title of the invention:
vibrating member and piezoelectric speaker using it)
[0025]
The present invention has been made in view of the above problems, and in a state in which a
ceramic plate is attached to a metal diaphragm diaphragm, vibration is performed by a pointed
end of an elastic support piece which receives elastic force of a spring in a resonance cylinder. By
controlling, the electric signal of the sound output from the sound device and amplified through
the amplifier and transmitted through the electric wire from high-pitched sound to low-pitched
sound, is a ceramic of incombustible material as a high-quality sound signal. Provided is a noncombustible piezoelectric speaker device that outputs sound through a plate and a metal
diaphragm diaphragm so that sound can be output without being affected by external influences
such as temperature and moisture during a fire. With the goal.
[0026]
Further, the ceramic plate is deformed to form a bent portion on the periphery of the metal
diaphragm diaphragm attached to the central hole, thereby correcting distortion of the vibration
and physically absorbing not only the bass but also the saturation phenomenon of the high
sound, Another object is to be able to amplify high quality sound.
[0027]
In addition, the high gain specific frequency generated by the material of the metal diaphragm
diaphragm such as copper, stainless steel, titanium, nickel and the like is absorbed in the inside
of the resonance cylinder in which the ceramic plate, the metal diaphragm diaphragm, and the
elastic support piece are built. Another object of the present invention is to make it possible to
selectively incorporate a sound absorbing material to reproduce stable frequencies.
[0028]
In addition, by arranging ceramic plates in parallel circuits on both sides of a metal diaphragm
diaphragm provided with a circular hole at the center, large vibrations can be transmitted to the
metal diaphragm diaphragm through both ceramic plates. Another purpose is to do so.
[0029]
In the non-combustible piezoelectric speaker device according to the present invention for
achieving the above object, in a state where a ceramic plate is attached to the center of a metal
diaphragm diaphragm, it is outputted from an acoustic device and amplified while passing
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through an amplifier. The electrical signal of the voice is transmitted, and the non-combustible
parts such as the ceramic plate and the metal diaphragm diaphragm output the voice without
being affected by the temperature and moisture at the time of fire. Enable the other pointed end
of the elastic support piece, one of which is supported while receiving the elasticity of the spring
to the resonance cylinder to which the metal diaphragm diaphragm is fixed, so as to control the
vibration of the ceramic plate, so that high noise From the lower to the lower end to be output as
a good quality audio signal, with a fold around the metal diaphragm diaphragm on which the
ceramic plate is mounted in the center By adding deformation that forms a position, correcting
distortion of vibration and reducing the saturation phenomenon of the whole frequency, high
quality sound can be amplified, and the ceramic plate, the metal diaphragm diaphragm, and the
elastic support piece are integrated. The sound absorption material which absorbs the frequency
of the high gain generated by the material of the metal diaphragm diaphragm such as copper,
stainless steel, titanium, nickel etc. is selectively built in the inside of the resonance cylinder to be
stabilized, and the frequency of stable whole band Are configured to be reproducible.
[0030]
According to the present invention, in a state where the ceramic plate is attached to the center of
the metal diaphragm diaphragm, the electrical signal of the sound output from the acoustic
device and amplified while passing through the amplifier is transmitted through the electric wire
to the ceramic plate It is transmitted through non-combustible parts including metal diaphragm
diaphragms.
[0031]
The other sharp end of the elastic support piece supported by the resonance cylinder to which
the metal diaphragm diaphragm is fixed while the one side receives the elasticity of the spring
controls the vibration of the ceramic plate so that the high sound to the low sound Make sure
that the sound of good quality is loudened.
[0032]
By forming a bent portion around the circumferential shape of the metal diaphragm diaphragm
to which the ceramic plate is attached at the center, it is effective to attenuate the distortion
frequency by reducing the saturation phenomenon.
[0033]
It is a schematic diagram showing the whole composition of the present invention.
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FIG. 7 is a schematic view showing the configuration of a vibrating member according to another
embodiment of the present invention.
It is a graph which shows the output frequency characteristic of the piezoelectric speaker by this
invention.
It is a graph which shows the output frequency characteristic of the conventional general
piezoelectric speaker.
It is a graph which compares and shows the output frequency characteristic of the piezo-electric
speaker by the present invention, and the conventional common piezo-electric speaker.
[0034]
Hereinafter, preferred embodiments of the present invention will be described with reference to
the attached drawings.
[0035]
The incombustible piezoelectric speaker device according to the present invention measures the
frequency characteristics of the metal diaphragm diaphragm 3 manufactured from materials
such as copper, stainless steel, titanium, nickel and the like with a frequency measuring
instrument, and grasps in advance which frequency band is weak. The ceramic plate 2 which is a
piezoelectric element is attached to the center of the metal diaphragm diaphragm 3 to
manufacture a vibrating member 1 of non-combustible material, and the metal diaphragm
diaphragm 3 of the vibrating member 1 is The other pointed end of the elastic support piece 7
fixed to the open portion and supported so that one is received the elastic force of the spring 6
inside the resonance cylinder 5 selectively vibrates with the ceramic plate 2 Of the incombustible
material when it is transmitted from the acoustic device 10 and amplified while passing through
the amplifier 11 and an electrical signal of voice is transmitted through the electrical wire 12.
Through the Mick plate 2 and the metal diaphragm diaphragm 3, it is output as an audio signal
of uniform sound quality from high to low tones, and the ceramic plate 2 is folded around the
circumference of the metal diaphragm diaphragm 3 mounted at the center The curved portion 4
is formed, the vibration of the metal diaphragm diaphragm 3 stops at that portion, the distortion
frequency mainly generated at the outer portion of the metal diaphragm diaphragm 3 is damped,
and the whole frequency is stabilized. A sound absorbing material 8 is attached to the inner
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surface of 5 to absorb and remove the frequency of the band causing distortion of the waveform
due to the frequency characteristic by the material of the metal diaphragm diaphragm 3
measured in the existing, from high tone to low tone It is made to be able to hear the sound of
uniform sound quality without being influenced by the temperature, moisture, etc. at the time of
fire.
[0036]
The non-combustible piezoelectric speaker device according to the present invention thus
constructed manufactures the ceramic plate 2 which is the piezoelectric element 2 to a thickness
of about 0.2 mm.
[0037]
Moreover, while manufacturing the metal diaphragm diaphragm 3 of materials, such as copper,
stainless steel, titanium, nickel, etc., a frequency characteristic is measured and it can be grasped
¦ ascertained beforehand in which frequency band it is weak.
[0038]
The ceramic plate 2 is attached to the center of the metal diaphragm vibrating plate 3 to
manufacture the vibrating member 1.
[0039]
Since the ceramic plate 2 of the vibrating member 1 and the metal diaphragm vibrating plate 3
are non-combustible materials that are not affected by moisture, sound can be output without
being affected by external influences such as temperature and moisture during a fire.
[0040]
The metal diaphragm diaphragm 3 of the vibration member 1 is fixed to the open portion of the
resonance cylinder 5 so that the vibration due to the vibration of the metal diaphragm diaphragm
3 and the ceramic plate 2 is performed in the resonance cylinder 5. Do.
[0041]
Further, in the inside of the resonance cylinder 5, the other sharp end of the elastic support piece
7 supported so that one receives the elastic force of the spring 6 selectively controls the
vibration with the ceramic plate 2. When the electric signal of the sound is transmitted through
the electric wire 12, the high frequency sound is transmitted through the incombustible ceramic
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plate 2 and the metal diaphragm diaphragm 3. By outputting as a voice signal of uniform sound
quality up to the bass, it is possible to listen to music and broadcast through stable high-quality
voice when an emergency does not occur.
[0042]
Further, the bending portion 4 is formed around the circumferential shape of the metal
diaphragm diaphragm 3 to which the ceramic plate 2 is attached at the center, and the vibration
of the metal diaphragm diaphragm 3 stops at that portion. It prevents the saturation
phenomenon that occurs mainly at the outer part and partially occurs at high tones, attenuates
the distortion frequency, and stabilizes the overall frequency.
[0043]
Furthermore, on the inner surface of the resonance cylinder 5 is attached the sound absorbing
material 8 for absorbing and removing the frequency of the band causing distortion of the
waveform due to the frequency characteristic of the material of the metal diaphragm diaphragm
3 measured in the prior art. Sounds of uniform quality can be heard without being influenced by
external influences such as temperature and moisture at the time of fire up to the bass.
[0044]
Since all of the ceramic plate 2 and the metal plate 3 are flame retardant, even in the event of an
emergency such as a fire, collapse of a building, various gas leaks, etc., it is possible to stably
broadcast the guidance broadcast.
[0045]
FIG. 2 is a view showing the structure of a vibration member according to another embodiment
of the present invention, which is a ceramic plate 22 having different diameter values on both
sides of a metal diaphragm diaphragm 20 provided with a circular hole 21 at the center. , 23 can
widen the frequency range through the two ceramic plates 22 and 23 and transmit the vibration
of the low frequency range to the metal diaphragm diaphragm 20, thus providing dynamic
sound. To be able to hear without external influences such as temperature and moisture at the
time of fire.
[0046]
Referring to FIGS. 3 to 5, the piezoelectric speaker according to the present invention listens well
to the 230 Hz band as well as the 1 KHz band which is the best audio frequency band of the
output frequency characteristic as shown in FIG. While the conventional piezoelectric speaker is
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in a ready state, as shown in FIG. 4, it is confirmed that the output frequency characteristic can
be heard well only up to the band up to 550 Hz. Ru.
[0047]
Therefore, an output frequency characteristic (identical to the illustration of FIG. 3) which can be
heard well up to 1 KHz band and 230 Hz band which are audio frequency bands of the
piezoelectric speaker according to the present invention and 1 KHz of the conventional general
piezoelectric speaker This can be seen more clearly through FIG. 5 which shows the band and the
output frequency characteristics (identical to the illustration of FIG. 4) which can be heard well
up to the band up to 550 Hz (compared with each other).
[0048]
Although the preferred embodiments of the present invention have been illustrated and
described above, the present invention is not limited to the above-described embodiments, and
within the scope of the subject matter of the present invention claimed in the claims. Those
skilled in the art will appreciate that various modifications can be made by anyone having
ordinary knowledge in the field to which the invention belongs, and such modifications are
included within the scope of the appended claims.
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