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DESCRIPTION JPS5827075

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DESCRIPTION JPS5827075
[0001]
The present invention relates to an electroacoustic transducer for a conditioner. In particular, the
present invention relates to an electroacoustic transducer used in a runner system for detecting
the distance and direction of a target. This kind of electric noise that has been proposed so far!
As shown in FIG. 1, the i # transformer (for example, JP-B 49-1223 W) a, as shown in FIG. 1, the
'IIL poles of the inner and outer diameter surfaces of one cylindrical piezoelectric element are
axially Of the two electrodes, one is divided into electrodes on the circumference of the cylinder
diameter surface, and the former electrode produces an electroacoustic transducing function in
which directivity in the radial direction becomes nondirectional, and the latter of the electrodes is
the circumference of the element As shown in FIG. 4, the two opposite electrodes facing each
other are connected in reverse by making the polarity of the polarization opposite, to create an
electroacoustic transducing function in which the directivity in the half pole direction becomes
directional. Therefore, the X pole that creates nondirectionality and the one that creates
directionalality divide one cylindrical piezoelectric element into one, and each electrode viewed
from one cylindrical piezoelectric element is a partial electrode As a result, there has been a
disadvantage that an increase in electrical impedance, a decrease in electro-acoustic conversion
efficiency, a decrease in output sound pressure, etc. There was also the drawback of a runaway
and rising prices. The present invention uses the same electrodes as the electrodes for making
omnidirectional and the electrodes for making directional, and creates the function of
omnidirectionality and the function of directionalality in the connection method of # pole, thus
the above-mentioned drawbacks. It is an object of the present invention to provide an electroacoustic transducer t-, which has a low electrical impedance, a high electro-acoustic conversion
efficiency, and is inexpensive. Specifically, the present invention is continuous from the top end
to the bottom end of the radially polarized cylindrical piezoelectric element n. Further, an
electrode divided in the direction of the circle is provided so as to be opposed between the inner
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diameter direction and the outer diameter surface, and two pairs of inner and outer diameter
direction 'IIL poles opposed on the circumference of the element are connected in series. As soon
as they are connected in reverse, and one set of WJ2 in which two sets of inner and outer
diameter surface electrodes orthogonal to the inner and outer diameter surface electrodes of this
first set are connected in series with their polarizations reversed. The output signals of the
individually connected balanced transformers are directional in each direction of the first and
second sets, and the first set of inter-electrode connection points and one thousand *! A signal
from an input / output terminal in which all the inner and outer diameter surface electrodes are
connected in order of polarization polarity using the neutral point of lance and the second set of
inter-electrode connection points and the neutral point of balanced transformer Is configured to
be omnidirectional. Next, a practical example of the present invention will be described with
reference to the drawings. The vibrators shown in FIGS. 6 and 7 are shown in which the lead
storage is drawn out from the pole in each of the four pieces of the electric wire #ji provided on
the circumference of the inner diameter surface and outer diameter surface of the cylindrical
piezoelectric element. To connect using balanced transformers 12 and 13.
When sound waves pass through the vibrator, a pressure distribution is generated on the outer
diameter surface of the vibrator, and the pressure distribution causes the vibrator to vibrate in
translation with the direction of the sound wave (hereinafter referred to as translational
vibration), and the vibrator expands and contracts. Do. The so-called respiratory vibration,
translational vibration applies alternating acceleration force evenly to each part of the cylindrical
piezoelectric element, and this alternating acceleration force and the piezoelectric effect of the
vibrator correspond to the direction of the alternating acceleration force and the polarity
direction of polarization. Four phases of Ic voltage are generated between the electrodes, and at
the same time, the respiratory vibration equally applies the cogging force to each cross section of
the cylindrical piezoelectric element, and this paternity power and the piezoelectric heat of the
vibrator An alternating voltage having a phase corresponding to the direction of the alternating
force and the polarity direction of the polarization is generated between the electrodes. When the
polarization of the cylindrical piezoelectric element is uniformly performed in the radial
direction, the voltage due to the translational vibration is inverted in phase between the front and
back surfaces of the sound wave f: and is in phase between one side surface. In addition, the
voltage due to the respiratory vibration is in phase over the entire circumference of the vibrator.
Therefore, when two pairs of opposing inner and outer diameters 1ris1ii on the circumference of
the oscillator are connected with the polarity of the polarization reversed, the in-phase
component of the voltage due to respiratory vibration and the voltage due to translational
vibration disappears, and the voltage due to translational vibration is reversed The phase
components are summed n to make the remaining sine or cosine directivity. Also, when two pairs
of inner and outer diameter surface electrodes are connected in order of polarization polarity, the
reverse phase component of the voltage due to translational vibration disappears, and the voltage
due to respiratory vibration and the voltage in phase due to translational vibration add up. n will
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remain. Since the in-phase component of the voltage due to translational vibration is unevenly
distributed with the incident direction of the sound wave as the symmetry axis, the sum of the inphase component of the voltage due to respiratory vibration and the voltage due to translational
vibration is made uniform over the entire circumferential surface of the oscillator In order to
achieve nondirectionality, all the inner and outer diameter surface electrodes of the vibrator are
connected in such a manner that the polarities of the polarizations become in order. Thus, as
shown in FIG. 8, directivity in the X direction can be obtained from the first set of 'llt poles 9a +
9b + 111 * 111) through the balanced transformer 12, and from the second set of electrodes gay
& b * 10a * 10b The directional directivity in the Y direction is lost through balanced transformer
13, and from the two equilibrium points O neutral point to conjugate ring 14, output capacitance
15 and diode 16t for transmission / reception switching-through OMNI (' A non-directionality is
generated at the transmission input skin of i ') and the reception output end of OMNI (R). The
connection in FIG. 8 is modified so that the neutral point of the balanced transformer 12 is the
same (a neutral point of 13 is short-circuited, and an electrode connection point of 9b and 11b
and an electrode connection point of 8a and tOa are also used as input / output terminals
Omnidirectionality is obtained. The neutral point of the balanced transformer 13 in FIG. 71 clag
8 and the electrode connection point of 9 b and 11 bq are short-circuited, and the electrodes 8 a
and 8 b and the electrodes 10 a and 10 b are respectively turned on to reverse the polarity of
polarization. Nondirectionality can also be obtained by using the 10's' dt pole connection point
and the neutral point of the balanced transformer 12 as input / output terminals.
The above explanation is for the case where four sets of electrodes are formed on the
circumference, but the present invention is not limited to this. The present invention can also be
applied to the case where 2 n sets of electrodes (n is a natural number) are formed instead of 4 ft
fixed n. That is, in this case, two sets of inner and outer electrodes are connected in reverse
polarity of polarization to obtain n directional characteristics, and n or less electrodes from n
circuits connected in reverse Are connected in such a way that the polarity of polarization is in
order to obtain nondirectionality. As described above, according to the present invention, a
vibrator provided with inner and outer diameter surface electrodes divided only in one chest
direction without division in one cylindrical piezoelectric element in one direction and two pairs
of inner and outer diameter surface electrodes facing each other Are connected in series by
reversing the polarity of the polarization and the output end is drawn out with a balanced microtransformer, and the inter-electrode connection point of the two sets of circuits and the neutral
point of two balanced transformers connected by an input / output As a result of the use
efficiency on the circumferential surface of the two cylindrical piezoelectric elements being
falsified by configuring the end to be drawn out, '-a decrease in the aerial impedance and an
electro-acoustic distortion factor' f: serving, output Sound pressure f: has an effect of increasing.
Furthermore, since the electrode structure is simplified, the vibrator, that is, the electric sound-tonoise converter can be made inexpensive.
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[0002]
Brief description of the drawings
[0003]
1 to 5 are drawings and connection diagrams of a vibrator using the conventional 1 as a freestanding w transducer, and FIG. 1 is a cross-sectional view of Nt 1 and FIG. 2 is a cross-cut of AAI. FIG. 3 is a plan sectional view of b-b I, FIG. 4 and FIG. 5 are connection diagrams
corresponding to FIG. 2 and FIG. 3, respectively.
6 is a side view of the vibration exciter according to the present invention, FIG. 6 is a plan view
thereof, and FIG. 8 is a connection diagram thereof. 1, 7---------------------------------------------------------cylindrical cylindrical piezoelectric element, 2 am2bt3at3by4a+4be5as5. by6as6bt8a + 8b +
9as9bt 10a * 10bs flat llb "”-”mmb12s13 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・
・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・
・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・. $ 1 Figure 2 Figure 3
Section 4 口 = 85L! J
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