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DESCRIPTION JP2006005625

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DESCRIPTION JP2006005625
PROBLEM TO BE SOLVED: To provide a piezoelectric type acoustic vibration generator which can
be connected to many kinds of acoustic electronic devices and can be shared with other audio
devices. SOLUTION: This is an acoustic vibration generating device in which an electric circuit
formed on a substrate 12 and a piezoelectric vibrating body 11 are integrally molded by molding,
and the piezoelectric vibrating body 11 is made of a piezoelectric bimorph having a shim, and the
piezoelectric vibration thereof. The body 11 is disposed in a notch provided in the substrate 12
and is joined to the substrate 12 through the shim. Further, the electric circuit formed on the
substrate 12 includes an amplification circuit, a D / A conversion circuit that converts a digital
voice signal into an analog voice signal, or a coil 16 that emits a magnetic field modulated by the
voice signal. [Selected figure] Figure 2
Acoustic vibration generator
[0001]
The present invention relates to an acoustic vibration generator using a piezoelectric vibrator,
and more particularly to an acoustic vibration generator in which an electric circuit and a
piezoelectric vibrator are integrated.
[0002]
When a piezoelectric vibrator is used as an acoustic vibration generator, a speaker with high
conversion efficiency can be obtained as compared to an electromagnetic vibration generator.
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However, as a normal speaker that generates air conduction sound through the outer ear, the
middle ear and the inner ear, there is a point that it does not correspond to the electromagnetic
vibration generator in terms of frequency characteristics and the like. Therefore, it has been used
in the past as a bone conduction sound, that is, a vibrator that generates an acoustic vibration
that is directly transmitted to the inner ear through the bone tissue without passing through the
middle ear. It is a use form similar to the bone conduction headset disclosed in Patent Document
1 and the like.
[0003]
Generally, a drive circuit of a piezoelectric vibrator is required to have a high drive voltage as
compared with an electromagnetic type. This is because, in order to lower the driving voltage, it
is necessary to increase the number of stacked piezoelectric vibrators, which complicates the
structure. When driving with such a high voltage, it is not possible to take advantage of the
inherent characteristics of the piezoelectric vibrator of high efficiency without adding an
amplifier circuit for impedance conversion or the like.
[0004]
Further, in the power consumption reducing device for a piezoelectric speaker disclosed in
Patent Document 2, the loss of the class B amplifier circuit itself requiring the idling current
increases in proportion to the power supply voltage, and the power consumption at no load
increases. It addresses the problem of not being able to make full use of the high efficiency
conversion characteristics of piezoelectric speakers.
[0005]
JP 2003-18683 A JP JP 2003-250 091 A
[0006]
As described above, it is necessary to use a drive circuit different from an electromagnetic
speaker in order to drive the piezoelectric vibrator by utilizing the high efficiency conversion
characteristic inherently possessed by the piezoelectric vibrator.
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However, as an acoustic vibration generator that can be used only for electronic devices having a
dedicated electric circuit, its application is limited.
In other words, it is desirable to be an acoustic vibration generator that can be used in place of
electromagnetic headphones. Moreover, when using as a vibration generator which generate |
occur | produces a bone conduction sound, it is desirable that it can be shared with the audio |
voice apparatus of air conduction sounds, such as a hearing aid.
[0007]
Therefore, it is an object of the present invention to provide a piezoelectric acoustic vibration
generator that can be connected to many types of acoustic electronic devices and can be shared
with other audio devices.
[0008]
The acoustic vibration generator of the first invention is characterized in that an electric circuit
formed on a substrate and a piezoelectric vibrator are integrally molded.
[0009]
An acoustic vibration generator according to a second aspect of the present invention is the
acoustic vibration generator according to the first aspect, wherein the piezoelectric vibrator is
made of a piezoelectric bimorph having a shim, and the piezoelectric vibrator is provided in a
notch provided in the substrate. It arrange | positions and it joins with the said board | substrate
via the said shim, It is characterized by the above-mentioned.
[0010]
An acoustic vibration generator of a third invention is characterized in that, in the acoustic
vibration generator of the first or second invention, the electric circuit comprises an amplifier
circuit.
[0011]
An acoustic vibration generator according to a fourth invention is the acoustic vibration
generator according to any one of the first to third inventions, wherein the electric circuit
includes a D / A conversion circuit that converts a digital audio signal into an analog audio signal.
It features.
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[0012]
An acoustic vibration generator according to a fifth invention is characterized in that, in any one
of the first to fourth acoustic vibration generators, the electric circuit includes a coil for radiating
a magnetic field modulated by an audio signal.
[0013]
In the acoustic vibration generator according to the present invention, since the electric circuit
formed on the substrate and the piezoelectric vibrator are integrally molded, a circuit unique to
the drive of the piezoelectric vibrator is integrated to form a general acoustic electronic device. It
becomes an easy-to-handle compact acoustic vibration generator that can be connected to
[0014]
Further, in the acoustic vibration generating device of the present invention, the piezoelectric
vibrating body is formed of a piezoelectric bimorph having a shim, and the piezoelectric vibrating
body is disposed in a cutout portion provided in a substrate of the electric circuit and supported
by the substrate via the shim. Because of this, it is easy to adjust the acoustic characteristics of
the piezoelectric vibrator.
[0015]
Further, in the acoustic vibration generating device of the present invention, the electric circuit
includes an amplification circuit, so that it is possible to generate acoustic vibration by
performing impedance conversion or voltage amplification on an audio signal output assuming
an electromagnetic speaker.
[0016]
Further, in the acoustic vibration generator of the present invention, the electric circuit includes a
D / A conversion circuit that converts a digital audio signal into an analog audio signal, so that a
general digital audio signal can be input to generate acoustic vibration.
[0017]
In the acoustic vibration generator of the present invention, the electric circuit includes a coil
that emits a magnetic field modulated by the audio signal, so that the audio signal can be sent to
the hearing aid having the telephone coil at a high S / N ratio.
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As a result, (1) in the piezoelectric vibrator, bone conduction sound is generated and
simultaneously air conduction sound is generated from the hearing aid to enhance hearing; (2)
only bone conduction sound of the hearing aid is generated without generating bone conduction
sound. It can be generated.
[0018]
Next, an embodiment of the present invention will be described based on the drawings.
FIG. 3 is a perspective view showing the appearance of the acoustic vibration generator of the
present invention, 11 is a piezoelectric vibrator, 12 is a substrate of an electric circuit, 13 is a
mold resin, and 14 is a connection cord.
As described above, in the acoustic vibration generator of the present invention, the rectangular
piezoelectric vibrator 11 is placed on the substrate 12 of the electric circuit together with the
electric circuit, and the whole is covered with the mold resin 13.
[0019]
FIG. 1 is a perspective view showing the inside of the acoustic vibration generator of
Embodiments 1 and 2 in a transparent manner, and it is drawn as if the mold resin is
transparent.
As shown in the figure, a rectangular plate-shaped piezoelectric vibrating member 11 is disposed
in the notch portion of the substrate 12, and the circuit component 15 is mounted on the same
substrate 12 to form an electric circuit, and the whole is a rectangular plate shape. Is covered
with the mold resin 13 of
[0020]
FIG. 2 is a perspective view showing the inside of the acoustic vibration generator of Embodiment
3 in a see-through manner.
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[0021]
The piezoelectric vibrator 11 used in the present invention is shown in FIG.
4 (a) is a cross-sectional view in the longitudinal direction, and FIG. 4 (b) is an external
perspective view. 32 is a shim made of a metal elastic plate, 33 is a piezoelectric ceramic plate,
34 is a covering layer made of a flexible material It is.
It is a rectangular plate-shaped piezoelectric bimorph whose longitudinal direction is the leftright direction of the drawing.
When one piezoelectric ceramic plate elongates in the longitudinal direction, a voltage is applied
so that the other contracts in the longitudinal direction to generate bimorph oscillation.
[0022]
The piezoelectric ceramic plate 33 mainly generates the displacement in the longitudinal
direction (the displacement in the lateral direction in the plane of FIG. 4A) by using the lateral
effect of the piezoelectric.
The piezoelectric ceramic plate 33 is rectangular and polarized in the thickness direction, and
causes expansion and contraction in accordance with the electric signal applied to the upper and
lower surfaces.
In addition, the structure in which the electrodes are divided into two groups for each layer and
polarization and voltage application can be performed for each layer is advantageous in that the
driving voltage can be significantly reduced.
Electrical connections are omitted from the figure.
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[0023]
The manufacturing method will be described.
For the two piezoelectric ceramic plates 33, NEC Tokin piezoelectric ceramic (trade name NEPEC
10) is used, and its dimensions are 32 mm in length, 8 mm in width, and 0.15 mm in thickness.
The shim 32 is made of 50 μm thick brass and has a length of 36 mm and a width of 8 mm.
These were bonded together with an epoxy-based adhesive, and an electrode (not shown) was
provided on the main surface on the outer side of the piezoelectric ceramic plate 33, and a lead
was drawn from the electrode and the shim.
[0024]
Next, liquid urethane rubber was poured over the entire surface of the piezoelectric bimorph
using a brass mold, and a coating layer was formed to a thickness of about 1.5 mm on two
surfaces in the thickness direction by curing. The thickness of the covering layer controls the
resonant frequency and the Q of the vibrator. Further, at this time, if one piezoelectric ceramic
plate 33 is formed in a plurality of layers and electrodes are provided for each, the driving
voltage can be reduced accordingly.
[0025]
The state of connection between the piezoelectric vibrator and the electric circuit board
manufactured in this manner is shown in a cross-sectional view in FIG. The substrate 12 and the
shim 32 are bonded and fixed, and the piezoelectric vibrating body 11 is disposed in the notch of
the substrate 12 and is bonded to the substrate 12 via the shim 32.
[0026]
Next, the electrical circuit of the acoustic vibration generator of the present invention will be
described. FIG. 6 is a block diagram showing the circuit configuration of the acoustic vibration
generator of the present invention, FIG. 6 (a) is a block diagram showing the circuit configuration
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of the first embodiment, and FIG. 6 (b) is the second embodiment. FIG. 6C is a block diagram
showing the circuit configuration of the third embodiment.
[0027]
In the circuit configuration (first embodiment) of FIG. 6A, an audio signal assuming an
electromagnetic speaker is voltage-amplified by the amplifier circuit 52 and impedance
conversion is performed to drive the piezoelectric vibrator 51.
[0028]
In the circuit configuration (second embodiment) of FIG. 6B, the D / A conversion circuit 53
converts the input of the digital audio signal into an analog audio signal, and then obtains driving
power to generate acoustic vibration in the piezoelectric vibrator 51. Let
[0029]
In the circuit configuration (third embodiment) of FIG. 6 (c), the piezoelectric vibrating body 51
bears the generation of bone conduction sound and shares it with the hearing aid which
generates air conduction sound, and the hearing aid has a high S / N ratio. It comprises means
for transmitting a signal.
By the way, there are types of hearing aids that have a pickup coil called a telephone coil, and
that the hearing aid user can receive an audio signal with a high S / N ratio from a telephone
without passing through a speaker.
The circuit configuration for sending an audio signal to this hearing aid is the configuration of
FIG. 6 (c).
[0030]
As shown in the figure, the output from the amplification circuit 52 is input to the piezoelectric
vibrator 51 and the impedance-matched magnetic field emission coil 54. As a result, bone
conduction noise is generated in the piezoelectric vibrator 51. On the other hand, the magnetic
field emission coil 54 emits a magnetic field modulated with an audio signal. Here, the magnetic
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field emission coil 54 is formed of a coil wound in a loop, and the magnetic field emission coil is
disposed on the substrate as shown in FIG. 2 in the internal perspective view, and the coil 16 is
an audio signal. It emits a modulated magnetic field and transmits it to the telephone coil of the
hearing aid. At this time, the other circuit component 15, the piezoelectric vibrator 11, the
substrate 12, and the mold resin 13 are the same as those in FIG.
[0031]
As described above, the effects obtained by sharing the generation of the bone conduction sound
by the piezoelectric vibrator and the generation of the air conduction sound by the hearing aid
will be described. In a general situation, adjusting the balance between the bone conduction
sound by the piezoelectric vibrator and the air conduction sound by the hearing aid makes it
possible to improve the audibility different for each hearing aid user. The balance also changes
depending on the use environment.
[0032]
To explain further, (1) when only bone conduction sound by the piezoelectric vibrator is used, the
input to the magnetic field radiation coil 54 may be turned off, or may be left on to turn off the
switch on the hearing aid side. The power consumption by the magnetic field radiation is slight.
In this state, the voice output from the voice generation electronic device can be heard by bone
conduction sound. (2) When only the air conduction sound by the hearing aid is used by turning
off the bone conduction sound output by the piezoelectric vibrator, high S / N is also obtained
from general acoustic electronic devices having no means for transmitting the magnetic field to
the telephone coil of the hearing aid. You can listen to the audio in ratio. (3) When the bone
conduction sound by the piezoelectric vibrator and the air conduction sound by the hearing aid
are used in combination, the maximum S / N ratio according to the S / N ratio by the air
conduction sound and the S / N ratio by the bone conduction sound Adjustment can be made to
obtain an N ratio.
[0033]
By the way, it is also possible to switch and operate the circuit configuration including the circuit
configurations of Embodiments 1 to 3 simultaneously.
[0034]
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As described above, when the plate-like piezoelectric vibrator is placed on a substrate of an
electric circuit for driving and the like, and the whole is molded, it is compact and easy to handle,
and can be used in place of an electromagnetic speaker. An acoustic vibration generator can be
obtained that can be connected to acoustic electronic devices and can be shared with other audio
devices.
[0035]
FIG. 2 is a perspective view showing the inside of the acoustic vibration generating device of
Embodiments 1 and 2 in a transparent manner.
FIG. 10 is a perspective view showing the inside of the acoustic vibration generator of the third
embodiment as seen through.
The perspective view which shows the external appearance of the acoustic vibration generator of
this invention. Fig. 4 shows a piezoelectric vibrator according to the present invention, Fig. 4 (a)
is a cross-sectional view in the longitudinal direction, and Fig. 4 (b) is an external perspective
view. Sectional drawing which shows the mode of the connection of the piezoelectric vibrator in
this invention, and an electric circuit board. Fig. 6 shows an electric circuit configuration of the
acoustic vibration generating apparatus of the present invention, Fig. 6 (a) is a block diagram
showing a circuit configuration of the first embodiment, and Fig. 6 (b) shows a block diagram
showing a circuit configuration of the second embodiment. FIG.6 (c) is a block diagram which
shows the circuit structure of Embodiment 3. FIG.
Explanation of sign
[0036]
11 and 51 Piezoelectric vibrator 12 Substrate 13 Mold resin 14 Connecting cord 15 Circuit part
16 Coil 32 Shim 33 Piezoelectric ceramic plate 34 Coating layer 52 Amplifier circuit 53 D / A
conversion circuit 54 Magnetic field emission coil
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