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Description 1, title of the invention
Composite oscillator
3. Detailed Description of the Invention The present invention relates to a composite m oscillator
for transmitting and receiving ultrasonic waves in an underwater noble document detection
device. An underwater noble document detection device is a device that transmits a pulse sound,
whose sound wave strikes a target and receives an fct wave to detect a target, and the time when
the wave is transmitted is the time when the wave was transmitted. The distance to the target is
determined by measuring how much delay has occurred. Heretofore, a vibrator used in the
underwater noble document detection device is used as both transmission and reception. When
used for transmission, while low impedance is preferable because the applied voltage to the
vibrator is low for the purpose of supplying high power, high impedance is used for reception.
There is a contradiction that it is preferable to obtain high five sensitivity. That is, there is a
disadvantage that the performance of either the transmission characteristic or the reception
characteristic must be sacrificed electrically, as it can be used both as a transmission and
reception function. It is an object of the present invention to structurally integrate the
transmitting longitudinal oscillator and the receiving oscillator 10 and to lower the impedance of
the takeout transmission independently of the electrical independence and increase the
impedance of the receiving wave. It is an object of the present invention to provide a structure of
a vibrator capable of enhancing the transmission / reception sensitivity. In the configuration of
the present invention, both ends of a wave receiving vibrator formed by bonding one side of a
piezoelectric sheet made of a polymeric piezoelectric material with electrodes formed on both
sides to an elastic plate are made to both ends of a wave transmitting longitudinal vibrator.
Electrical terminals are provided in a bonded structure, and transmission and reception of sound
waves are composite vibrators that make use of their respective advantages by using the end face
20EndPage: 1 of the longitudinal transducer for transmitting waves. Next, embodiments of the
present invention will be described with reference to the drawings. 1 and 2 show the first
embodiment, and FIG. 1 is a perspective view, and FIG. 2 is a cross-sectional view. Longitudinal
vibrator 1 for wave transmission is a Langeban type vertical in which four piezoelectric or
electrostrictive materials 2 are electrically connected in parallel and stacked, and gold S elastic
bodies 3 and 4 such as aluminum, iron and stainless steel are joined to both ends thereof. It
shows about the case of a vibrator. The lead wires 5 and 6 are attached to the metal elastic body
4 and taken out from the through hole 7.8. The vibrator for wave reception is a piezoelectric in
which positive and negative electrodes are provided on the front and back of polyvinylidene
fluoride (PVDF) and poly-IJyllk / 171-J (PMG)% O polymer piezoelectric material on a thin-plate
cylindrical elastic body 9 such as metal. The sheet 10 is adhered. The lead wire 11.12 of the
wave receiving vibrator is removed from the positive and negative electrodes of the piezoelectric
sheet 10. In the case of a good circuit configuration in which the negative electrodes of
transmission and reception are common, it is possible to use the negative electrodes of
transmission and reception as common electrodes from metal elastic bodies 3, 4 and 9.
The principle of operation will now be described. In general, it is common to use a vertical
transducer for transmitting waves as a 1⁄2 length vertical imaging moving transducer having a
good electroacoustic conversion efficiency. When the transmission longitudinal oscillator 1 is
driven with the number of resonances 5 and 6 and the number of resonances from 5 and 6,
resonance occurs in the vibration direction shown by the arrow in FIG. 2, the rIft end face
becomes an antinode and the central part becomes a node. On the other hand, in the vibrator for
wave reception, the polymeric piezoelectric sheet 10 is adhered to the surface of the thin plate
cylindrical elastic body 9 made of metal or the like, and both ends of the thin plate cylindrical
elastic 10 body 90 are respectively It is fixed. Now, when the transmission longitudinal oscillator
l converges, the thin-plate cylindrical elastic body 9 of the reception am core expands, and
conversely, when the transmission longitudinal oscillator 1 extends, the thin-plate cylindrical
elastic body 9 contracts. The piezoelectric polymer sheet 10 is deformed in response to the
deformation as described above, and an output voltage is generated between the sheath wire
11.12 by the piezoelectric effect. Here, the composite type vibrator having the highest electrictoner conversion efficiency of 20 if the natural frequency of the thin-plate cylindrical elastic body
9 to which the polymeric piezoelectric sheet 10 is bonded is made to coincide with the natural
frequency of the transmitting vertical moving element l. In addition, when it is desired to broaden
the sensitivity frequency characteristics, it is possible to intentionally shift the natural
frequencies of both, and it is better to use the transmitting longitudinal oscillator 1 to increase
the number of laminated piezoelectric or electrostrictive materials 2 to electrically By connecting
in parallel, it is possible to lower the impedance and lower the applied voltage at the time of
transmission. On the other hand, the transducer for receiving wave is a feature of the polymeric
piezoelectric sheet 10. High sensitivity can be achieved by utilizing the constant pressure of 4 g
constant. It is also possible to further increase the sensitivity by increasing the number of
laminated piezoelectric polymer sheets 10 and electrically connecting them in series. Although
the longitudinal transducer 1 for wave transmission has been described in the case of a two-inone transducer, it may be a longitudinal transducer made of only a piezoelectric or
electrostrictive material, or may be a transducer of an electric type. In addition, the inside of the
joint of the transmission longitudinal vibrator may not necessarily be cylindrical but may be
polygonal, and the shape of the reception vibrator may be not cylindrical but strip-like. In the
same figure, in the figure, T indicates a transmission, and 几 indicates a direct receiving
electrode. According to the present invention, by integrating the vertical transducer for
transmitting wave 5 and the transducer for receiving wave as described above, it is possible to
obtain a transducer with high wave transmitting sensitivity and receiving sensitivity. .
4. Brief Description of the Drawings FIGS. 1 and 2 are a schematic perspective view and a
sectional view of an embodiment according to the present invention. Engineering ········ Vertical
transducer for transmission 2 · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · metal elastic body, 5.6 · · · · ·
Lead wire for wave transmission, 7.8
··························································· Polymer polymer sheath;
································································································································ 6-EndPage: 2! New lF 5 '!
F170EndPage: 3
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