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JPS62250800

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DESCRIPTION JPS62250800
[0001]
BACKGROUND OF THE INVENTION The present invention relates to a transducer using a boltclamped Langevin oscillator, particularly an active / passive dual-purpose sonar which has a
broad band reception function in a low frequency region in addition to a transmission / reception
function in a resonance frequency band. It relates to a wave. [Background Art] Conventionally, in
order to obtain a high acoustic output, a transducer for an active sonar is pinched by a
piezoelectric vibrator 18-1h as shown in FIG. 4 with a front mass 2b and a rear mass 3b and
clamped with a bolt 4b. The front mass 2b is supported and used by the rubber plate 15 as a
propagation path of the sound wave and the shock absorbing material 14 for blocking the
vibration, using the bolt-clamped Langevin vibrator. 6bはケース、7bはスペーサ。 8b is a lid,
9c is an O-ring, 10b and 10c are screws, and 16 is a pressure plate. The bolt-clamped Langevin
vibrator is a structure suitable for compensating for low tensile strength against high
compressive strength of the piezoelectric vibrator, and a mechanical resonance point is obtained
by applying a compressive load to the piezoelectric vibrator with a bolt. It has a structure that
can withstand large amplitude vibration in Then, by using a bolt-clamped Langevin oscillator
near the primary resonance frequency of longitudinal vibration, a transducer with high
conversion efficiency is configured. Also, as shown in FIG. 5 (a), a conventional passive sonar
receiver uses a cylindrical piezoelectric vibrator 17 and directly transmits a sound wave having a
frequency lower than the resonance frequency f0 due to respiratory vibration. The piezoelectric
vibrator 17 of the shape can be vibrated by respiration, and flat receiving voltage sensitivity is
obtained over a low frequency wide band as shown in FIG. 5 (b). 18a is a cap, 19 is a bolt, 20a
and 20b are shock absorbers, and 21 is a mold. [Problems to be Solved by the Invention]
However, a transducer using a conventional bolt-clamped Langevin oscillator has a front mass
and therefore supports a front mass, so that the passive sonar frequency band is lower than the
primary resonance frequency of longitudinal vibration. Vibration could not be transmitted from
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the front mass, which is the receiving surface, to the piezoelectric vibrator, and the receiving
voltage sensitivity became too low to be used as a passive dual-use transducer. Also, the
conventional cylinder Transducers using this type of piezoelectric vibrator can not apply a
compressive load like a bolt-clamped Langevin vibrator, so the low tensile strength of the
piezoelectric vibrator limits the sound output, so a high output can be obtained. Not suitable for
active sonar transducers. An object of the present invention is to provide an active / passive
multi-function transducer.
[Means for Solving the Problems] In the present invention, the polarities of the plurality of
piezoelectric vibrators are alternately stacked alternately, the front mass and the rear mass are
attached to both ends, and the front mass and the rear mass are connected by tightening with
bolts. In a transducer using a bolt-clamped Langevin oscillator, a bolt-clamped Langevin oscillator
is supported by a supporter previously provided at the node of oscillation in the primary
resonance mode of longitudinal oscillation, and the front side of the freon mass is acoustically
And a positive and negative input terminal in which electrodes of the same polarity of the
stacked piezoelectric vibrators of the bolt-clamped Langevin vibrator are electrically connected in
parallel in total, and one electrode (for example, a negative charge If With the other electrode (for
example, positive electrode) between the front mass and the supporter in the connected state. It
is a transducer characterized by having an output end between the supporter and the other
electrode (for example, positive electrode) between the rear mass. Next, an embodiment of the
present invention will be described with reference to the drawings. FIG. 1 is an embodiment of
the present invention. In FIG. 1, the piezoelectric vibrators 1a "ld are stacked alternately in
opposite polarity via the supporters-5, and the front mass 2a and the rear mass 3a at both ends
are tightened with a bolt 4a, and static compressive stress .sigma. A bolted Langevin oscillator is
added. The supporter 5 located at the node of the bolted Langevin oscillator is fixed by the case
6a by the spacer 7a and the lid 8a, and the external acoustic medium contacts only the front
surface of the front mass 2a. Do. 9a、9bはOリング、10aはネジである。 The electrodes
of the polarization polarity of the piezoelectric vibrators 1a to 1d (hereinafter referred to aselectrodes) are all connected and drawn out to form a ground 13b, and the polarization of the
piezoelectric vibrators 10 to 1d between the front mass 2a and the supporter 5 A live electrode
of polarity (hereinafter referred to as “ten electrode”) and a live electrode of the piezoelectric
vibrator 18 ~1b between the supporter 5 and the rear mass 38 are drawn out at each section 9
and connected to terminals 11a and 11b of the changeover switch 11 respectively. It is
connected. When the changeover switch 11 is connected to the 82 side, all the raw electrodes
are connected, that is, they are phase-connected and drawn out to the terminal 13a, and together
with the terminal Llb, transmitted and received around the primary resonance frequency of the
longitudinal vibration of the Langevin oscillator. Input and output terminals of the active
transducer. Since the vibration mode at this time moves in the direction in which the front mass
2a and the rear mass 3a are opposite to each other with the support 5 as a node as shown in
FIGS. 2 (a) to 2 (c), the piezoelectric vibrators 18 to 1d Static compressive stress σ.
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An alternating stress of the same phase is generated on the basis of, and a voltage of the same
phase is induced. Since the piezoelectric vibrators are connected in phase, the sensitivity of the
transducer is as shown in (d) to (e) of FIG. 2 in which the total length of the bolt-clamped
Langevin vibrator is λ. / 2 (λ. Is the maximum at the primary resonance frequency f0 of the
longitudinal vibration, which is the wavelength). When the changeover switch 11 is connected to
the 51 side, the raw electrodes are drawn directly from the terminals 11a and 11b to the
terminals 12a and 12b, that is, they are differentially connected, and the terminals 12a and 12b
receive in the low frequency band. It becomes the output end of the wave receiver. When a sound
wave of a frequency lower than the primary resonance frequency of longitudinal vibration is
received from the front mass 2a by differential connection, the front mass 2a and the rear mass
3a are driven by the sound pressure as shown in FIGS. 3 (a) to 3 (c). In the piezoelectric vibrators
10 to 1d between the front mass and the supporter, and the piezoelectric vibrators 18 to 1b
between the supporter and the rear mass, the stresses in the opposite directions are opposite to
each other. As a result, voltages in opposite phase to each other are induced, but since terminals
12a and 12b are differentially connected, as shown in FIG. 3 (4), stable flat received voltage
sensitivity across a wide frequency band of low frequency It becomes a characteristic. However,
the primary resonance frequency f of longitudinal vibration. In this case, stress in the same
direction is generated in all of the piezoelectric vibrators 1a to 1d, and the voltage generated in
the piezoelectric vibrators 18 to 1b and the voltage generated in the piezoelectric vibrator 1c = ld
cancel each other. It drops significantly. [Effects of the Invention] As described above, in the
transducer of the present invention, the polarities of a plurality of piezoelectric vibrators are
alternately stacked alternately, the front mass and the rear mass are attached to both ends, and
the front mass and the rear mass are fastened by bolts. The bolt-clamped Langevin vibrator is
supported by a supporter previously provided at the node of vibration in the primary resonance
mode of the longitudinal vibration of the bolt-clamped Langevin vibrator connected in series, and
all the electrodes of the laminated piezoelectric vibrator are electrically The input / output end
arranged in parallel and the other electrode between the front mass and the supporter (a live
electrode in the embodiment according to the present invention) and the supporter in a state
where all the one electrodes (one electrode in the embodiment according to the present
invention) are connected The switch end switches the output end between the negative mass and
the other electrode between the rear mass and the phase connection and the differential
connection. Active transducer with high conversion efficiency near the primary resonance
frequency of vibration, high power and active transducer, and flat passive voltage sensitivity over
low frequency broadband, active / passive There is an effect that it can be used as a multifunctional transducer.
[0002]
Brief description of the drawings
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[0003]
FIG. 1 is a longitudinal sectional view showing an embodiment of a transducer according to the
present invention, and FIGS. 2 (a) to 2 (c) are bolted lange bangs when the changeover switch of
FIG. Vibration state diagram of primary resonance mode of longitudinal vibration of vibrator, ((1)
shows transmission voltage sensitivity characteristics, (e) shows reception voltage sensitivity
characteristics, and FIGS. 3 (a) to 3 (c) show FIG. The vibration state diagram of the bolt-clamped
Langevin oscillator when the changeover switch in 1 is connected to the 81 side, (d) is the
receiving voltage sensitivity characteristic chart, and FIG. 4 is the active using the conventional
bolt-clamped Langevin oscillator FIG. 5 (a) is a longitudinal sectional view of an example of a
conventional passive sonar transducer, and FIG. 5 (b) is a passing voltage sensitivity
characteristic diagram.
1a to 1h, 17: piezoelectric vibrator, 2a, 2b: front mass, 3a, 3b: rear mass, 4a, 4b, 19: por 1-15:
supporters 16a, 6b- Case, 7a, 7b-spacer, 8a.
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