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DESCRIPTION JPS5761400

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DESCRIPTION JPS5761400
Specification 11 Title of the Invention Transducer 1, Electrode (/ 7. Disc-like piezoelectric
transducer element (/ 6), an outer casing (/ J) with the-side of the disc-like transducer element (/
6) placed on the bottom, the disc-like element Acoustic impedance element (, 2 and said
transducer element C / 6) engaged on the other side of the transducer element (16) and in such a
way that one side contacts the medium through which the sonar energy to be delivered
propagates k) means for energizing </) 'fr, in the sonar transducer, the acoustic impedance
element (24A) K is negative at a resonant frequency determined by the diameter of the disc-like
transducer element (16). ° The transformer element (/ 6) is energized at a frequency at which a
resonance occurs when loaded.
λ 0% claim scope
3. Detailed Description of the Invention The present invention relates to a transducer using a
piezoelectric transducer element. Conventionally, using a transducer having a piezoelectric
transducer element in the shape of a disk, it is possible to provide polarity in the axial direction
of the disk shape and to provide electrodes on both surfaces of the disk shape. It is done. When
using such a disk-shaped transducer element as a transducer, one surface of the disk-shaped
transducer element is placed on a backing plate placed on the bottom of the recess, and the other
side is a thin partition wall In use, the medium should be energized at an appropriate frequency
to cause the axial vibration of the disc-shaped transducer element, the medium through which
the finger movement is to be passed through the partition wall. Send out during. If the medium is
air, it is known to use this type of transducer designed to operate at, for example, / 10 KHz, and
an acoustic impedance element is interposed, and its surface is a disc. Matching with the medium
to which ultrasonic energy is to be supplied, connected to the other side of the transducer
structure, and making such an acoustic impedance element in the form of a layer of epoxy resin
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material It is also known. Therefore, at the above-mentioned frequency / soKHz, the resin layer of
the partition becomes relatively thin, so the mass and overall characteristics of the partition are
likely to change unfavorably to the humidity and other external factors, and the mass of the
partition changes Then, because the acoustic impedance of the bulkhead changes, the output of
the transducer has dropped by one. On the other hand, ultrasonic transducers that operate in air
and generate an oscillating sound at a frequency of sOK Hz only operate effectively over
relatively short distances due to the attenuation of ultrasonic energy in air. That is, the disk-like
piezoelectric transducer element described above is typically designed to operate at a resonant
frequency of 100 KHz or higher, but at such frequencies attenuation in the air is avoided even
over short distances. Absent. However, this type of transducer element has the advantage that it
is inexpensive and can usually be created from lead zirconate or barium titanate. The present
invention relates to a disk-shaped piezoelectric transducer element having an electrode, an outer
casing mounted on the entire bottom surface of one surface of the disk-shaped transducer
element, and another one-sided engagement of the disk-shaped transducer element. The present
invention relates to a transducer for a sonar including an acoustic impedance element whose one
surface is in contact with a medium through which a source energy to be delivered propagates
and a means for fully energizing the transducer element. According to the present invention, the
transducer element is energized at a frequency at which resonance occurs at the resonance
frequency determined by the diameter of the disk-shaped transducer element after being loaded
by the acoustic impedance element.
According to the arrangement as described above, the axial vibration of the disk-like transducer
element is transmitted into the medium through the acoustic impedance element, but the
frequency of the vibration is the disk-like transducer element As a matter of course, the
resonance frequency is significantly lower than in the case where it is determined by the axial
thickness of the disc-like transducer. Therefore, the thickness of the acoustic impedance element
required for the purpose of matching at relatively low frequencies becomes extremely thick, and
the resonance frequency of the transducer element under load is 30 KHz "" ", for example. C that
exceeds the thickness FiIwrwr of the acoustic impedance element made of epoxy resin on the
material. That is, for the thickness of an acoustic impedance element, t'h of the wavelength of the
acoustic energy passing through the acoustic impedance element is i, and thus it is determined
by the acoustic propagation velocity in the acoustic impedance element. An acoustic impedance
element having such a thickness t is less susceptible to moisture and other extrinsic shadows 41.
In a preferred configuration example of the transducer according to the present invention, the
EndPage: 2 disk-shaped transducer element is placed on a backing plate placed on a substrate of
a tip-like container, and the tip-like container is used as the acoustic impedance element. It is
filled with an epoxy resin material, and in the same manner as in the prior art, a tube is extended
from the central portion of the substrate of the tip-like container, and the connecting wire to the
electrode of the transducer element through the tube The electrodes are preferably formed on
the flat surface of a disk-shaped transducer element, as in the prior art. Thus, since the
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transducer of the present invention uses a standard disk-like transducer element, it can be
manufactured relatively inexpensively, and operates at a relatively low frequency, for example,
30 KH3. Because of this, they operate effectively in air even over relatively long distances, for
example 10 * or more. It is noted that the transducer of the present invention is suitable not only
for propagation in air exhibiting relatively high impedance to acoustic energy, but also for
propagation in water and other fluids. The invention will now be described in detail by way of
example with reference to the drawings. First, a schematic configuration of the transducer of the
present invention is shown in FIG. In the illustrated configuration, a butterfly, oscillator / is
coupled to the transducer head 3 via a coaxial cable 2.
The transducer head 3 has a tip-like outer shell 1 / t threaded with an outer 1tl, which extends
from the central opening of the substrate / 2, as shown in FIGS. 2 and 3. 10k, and the inner
surface of the substrate / co is provided with grooves / 3 and / 44'i extending along the
diametrical direction of the substrate 12. Also, a backing plate / jf is placed on the inner surface
of the substrate / 2, and a transducer element made of PZT ceramic made of vernitron (V6rnitron) in this example is placed on the plate / j. A disc-like transducer element / 6i loaded with a
diameter of about 3 /, 75 starvation Ill and a thickness of about / ≠ @ Ill. The above-mentioned
backing plate / j is in the form of a neobrene washer, and the inner wall surface of the container
10 is a metal plate. Also, the transducer element / 6 in the form of a piezoelectric crystal has
electrodes 17 and it respectively on its outer and inner flat surfaces, which electrodes / Ir and 17
are in the tube / 2 Are soldered to the inner conductor 21 and the outer conductor 2- of the
coaxial cable .lambda. The solder is extended to the point 2 o via the central portion opening of
the backing plate / j of the inner conductor 2 of the coaxial cable 2, and the outer conductor 22
of the coaxial cable 2 is the substrate 12. Along the groove between the pressure plate and the
backing plate / j, and further through the space between the disc-like transducer element 16 and
the container 10, on the metallized inner wall surface of the container 10 After soldering, the
above-mentioned soldering extends to the point / mark. In addition, in the tip-shaped container I,
the epoxy resin is filled around and on top of the transducer element / 6, and at least 10 lectures
of disc-shaped transducer element / 6 epoxy resin layers of the soil are provided. The thickness
of the Thus, the epoxy resin layer moss acts as an acoustic impedance element and has a
thickness equal to 4 of the wavelength at the frequency at which the transducer is intended to
operate. The illustrated configuration example is designed to operate at 3 kHz, and the frequency
of 3 kHz is one of the resonant frequencies of the transducer element when loaded by the
acoustic impedance element. Thus, although the transducer according to the illustrated
configuration can be operated at as low as / so KHz if desired, it is necessary to significantly
increase the thickness of the epoxy resin layer moss # 1 . Also, in order to achieve impedance
matching of 1 ° by the acoustic impedance made of epoxy resin 11-g, it is possible to use the
epoxy resin material during molding without changing the thickness of the sound V impedance
of the epoxy resin layer 2μ. Additives at various concentrations?
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It can be made to change by adding. It is to be noted that the above-described frequencies and
dimensions are only preferred examples, and the transducer of the present invention designed to
operate at, for example, 20 KHz can be easily realized. EndPage: 3 In the configuration shown in
FIG. 1B, the oscillator / resonator B has a resonant frequency determined by the diameter not
depending on the axial thickness of the disk-shaped transducer element / 6 at a constant interval.
The transducer element 6 is energized at a frequency at which the transducer element 16
resonates when loaded with the epoxy resin layer 2. Other piezoelectric crystal materials such as
lead zirconate and barium titanate can be used for the transducer of the present invention. The
acoustic impedance element layer λμ can also be made of a material other than epoxy resin,
and the front surface thereof can also be covered with a thin disc of stainless steel. In addition, a
metal disk may be joined to the back surface of the disk-shaped transducer element 1 'so that the
resonance frequency can be lowered. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block
diagram showing a schematic configuration 1 of the transducer according to the present
invention, wIJ is a longitudinal sectional view showing an example of the configuration of the
transducer head, and FIG. It is a top view which shows the structure of the outer casing of a
transducer head. / ... oscillator, lambda ... coaxial cable, 3 ... transducer head, lo ... cup-shaped
container, // ... tube, / co ... substrate, 13. / Μ ... groove, lj ... backing plate, 16 ... disk-like
transducer element / 7. / I ... electrode / 9, 20. Core 3 · · · soldered points, 2 / · · · · · · · · · · · · · · · · · ·
epoxy resin layer. Attorney Attorney Atsushi SugimuraEndPage: 4
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