close

Вход

Забыли?

вход по аккаунту

?

JPH02303299

код для вставкиСкачать
Patent Translate
Powered by EPO and Google
Notice
This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
financial decisions, should not be based on machine-translation output.
DESCRIPTION JPH02303299
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
transducer, and more particularly to a transducer for a low frequency, high efficiency, high
acoustic output sonar. [Background Art] Conventionally, as shown in FIGS. 4 and 5, this type of
transducer comprises the disk-like piezoelectric material 16 of FIG. The vibrating element 11 is
attached by bonding, and the periphery of the vibrating plate 12 is joined and supported at the
end of the case 13. When a voltage is applied to the electrode 17 of the vibrating element 11 via
the cable 15 to this transducer, the piezoelectric lateral effect is produced in the radial direction
of the vibrating element, that is, by the action in which the polarization direction and the
vibration direction of the piezoelectric material are orthogonal As a result, a so-called flexural
vibration in which the bimorph structure of the diaphragm and the vibrating element is displaced
in the central axis direction of the disk is generated due to the strain difference with the
diaphragm 12. The vibration distribution of this bimorph structure is shown in FIG. 5 by a dotted
line and an alternate long and short dash line. The resonance frequency according to this flexural
vibration mode is determined by the flexural rigidity and equal mass of the bimorph structure,
and these are determined by the diameter and thickness of the diaphragm and the vibrating
element, the size 1 elastic constant, and the specific gravity. In general, the stiffness of the
bimorph structure is about the ratio of thickness to diameter, which is smaller than the stiffness
of the longitudinal vibration that causes half-wave resonance inside the elastic body of the same
material, so it has low frequency resonance even with small dimensions. You can get it.
Therefore, by using the bimorph structure, it is characterized in that a compact, low frequency
transducer can be obtained. [Problems to be Solved by the Invention] However, in the abovedescribed conventional transducer, the piezoelectric transverse effect of the vibrating element is
compared with the piezoelectric longitudinal effect, that is, the electromechanical conversion
compared with the action in which the polarization direction and the vibration direction of the
04-05-2019
1
piezoelectric material are parallel Since the constant is low, the electrical impedance angle at the
resonant frequency between the electrodes is high, and there is a disadvantage that the acoustic
output can not be increased because the reverse withstand voltage for the polarization voltage is
reached at low input power. Moreover, since the volume of the vibrating element is small, the
mechanical vibration output is small, and increasing the volume of the vibrating element
increases the dimensions of the acoustic radiation surface and the thickness of the bimorph
structure, and changes the directivity of the acoustic radiation and the resonance frequency. is
there. It is an object of the present invention to provide a transducer that uses high frequency
output by using a vibrating element with a piezoelectric longitudinal effect and making use of the
feature of low frequency resonance due to flexural vibration of a diaphragm. is there. [Means for
Solving the Problems] The transducer according to the present invention comprises a diaphragm
made of a disk-like elastic body, a case made of a cylindrical high-rigidity body having an end
joined to the periphery of the diaphragm, and A cylindrical vibrating element having a diameter
of about 172 or more of the vibrating plate, one end face of which is concentrically bonded to
the inner surface of the vibrating plate, and the other end face of the cylindrical vibrating
element and the case It comprises and a lid by a highly rigid body which connects and
pressurizes and supports a cylindrical vibration element.
Next, the present invention will be described with reference to the drawings. 1 and 2 are a partial
sectional perspective view and a longitudinal sectional view of an embodiment of the present
invention. The periphery of the diaphragm 2 and the end of the case 3 are joined, and one end
face of the cylindrical vibrating element 1 is concentrically bonded to the inner surface of the
diaphragm 2 and housed in the case. The lid 4 is in contact with the other end face of the
vibrating element 1 and applies pressure and supports the vibrating element 1 by screw
connection with the case 3. As shown in FIG. 3, the vibrating element 1 has a plurality of annular
piezoelectric materials 6 having electrodes 7 on both end surfaces in the axial direction. ing. The
cable 5 pulls the input / output end of the electrical signal to the outside from the electrode
connected in positive and negative directions. When an electrical signal is applied to the cable 5,
distortion due to the piezoelectric longitudinal effect occurs in the vibrating element 1, and axial
expansion and contraction due to this distortion are transmitted to the diaphragm 2 and the lid 4
as a driving force. Since the lid 4 is made of a rigid material and dimensioned structure together
with the case 3, most expansion and contraction of the vibration element 1 contribute to the
displacement of the diaphragm 2. As a result, the vibration plate 2 generates flexural vibration
with the bonding peripheral portion with the case 3 as a support point and the bonding surface
with the vibration element 1 as a drive point. By setting the material and dimensions of the
diaphragm 2 so that the flexural resonance frequency of the diaphragm alone matches the
operating frequency, regardless of the length of the vibrating element l, that is, the volume,
efficient low at the resonance point Since frequency transmission is possible, the increase in
acoustic output can be measured by the increase in volume of the vibrating element. In addition,
the vibration element 1 can be pressurized with a lid 4 to apply a compression bias to reinforce
04-05-2019
2
the low tensile strength of the piezoelectric material 6 to increase mechanical vibration output.
As described above, according to the present invention, the resonance frequency of the flexural
vibration is determined by the diaphragm, and the driving direction of the vibrating element to
the diaphragm is made parallel to the direction of the flexural vibration. As a result of being able
to measure the efficient increase of the output, there is an effect that it can be used as a
transducer of high efficiency and high sound power for low frequency.
[0002]
Brief description of the drawings
[0003]
1 is a partial sectional perspective view of the transducer according to the present invention, FIG.
2 is a longitudinal sectional view of the transducer according to the embodiment of FIG. 1, and
FIG. 3 is a perspective view of the transducer element 1 of FIG. 4 is a partial cross-sectional
perspective view of the conventional transducer, FIG. 5 is a longitudinal cross-sectional view of
the transducer of FIG. 4, and FIG. 6 is a perspective view of the vibrating element 11 of FIG.
1, 11 и и и и и и Vibration element, 2, 12 и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и lid и 5, 15 и и и
иииииии Cable, 6, 16 ииииии Piezoelectric material, 7, 17 ииииии Electrodes. Agent Patent Attorney Uchihara
Satoshi 1 figure 2 figure 3 dairy
04-05-2019
3
Документ
Категория
Без категории
Просмотров
0
Размер файла
11 Кб
Теги
jph02303299
1/--страниц
Пожаловаться на содержимое документа