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JPS62135100

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DESCRIPTION JPS62135100
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
electroacoustic transducer, and more particularly to an electroacoustic transducer used at low
frequencies. 2. Description of the Related Art An electroacoustic transducer of this type converts
sound energy into mechanical energy and transmits the energy into the water by transmitting the
mechanical energy into the water. A conventional electro-acoustic transducer utilizing refractive
vibration comprises a peristaltic element composed of an electrostrictive probe 31 and a shell 32
as shown in FIG. 5, and the thickness is uniform due to the vibration of the vibrator. The shell is
bent and vibrated to emit sound waves into the water. As shown in FIG. 4, in the vibrational state
of the shell, the solid line indicates the equilibrium state 20 of the shell's neutral plane, and the
broken line indicates the operating state 21 of the shell's neutral plane. Therefore, when an
external pressure is applied to the long diameter portion (long -g2b) of the equilibrium state 20
of the neutral surface of the shell to obtain the displacement amount ξb, the displacement
amount ξa of the short diameter portion (length 2a) is generally determined from the
displacement amount ξb Sound waves can be radiated more efficiently into the water. Also, the
same vibration if of the conventional uniform shell of thickness t is the total length of the shell '!
14so, Young's 4 'fcE of the shell material, 留置 for the shell material placement and hd thickness
of the shell can be obtained by the equation (1) (for example, by the Journal of Acoustical
Society, the natural frequency is lowered) To do this, either increase the size of the shell or
reduce the thickness of the shell. However, if the size of the shell is increased, the size of the
converter will be too small to fit, and the weight will increase, making it inconvenient to handle
and further increasing the manufacturing cost. When the thickness of the shell is reduced, the
water pressure resistance is reduced, which makes it difficult to install or lower the shell deep in
the sea. Also, under certain limitations, the thickness of the shell is partially reduced to lower the
solid vibration f12 'without substantially reducing the water pressure resistance (see, for
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example, Japanese Patent Application No. 60-94926). book). [Problems to be Solved by the
Invention] The conventional problems to be solved by the present invention are, as mentioned
above, inconvenient for handling when the dog's diameter of the shell is increased to lower the
natural frequency. The point is that as the shell thickness decreases, the water pressure
resistance decreases. Accordingly, the present invention is to provide an electrical sound 9
converter which overcomes the above-mentioned drawbacks. [Means for Solving the Problems]
The electroacoustic transducer according to the present invention has a junction between the
vibrating surface of the vibrator and the shell on the inner surface of the shell surrounding the
vibrator, and the acoustic wave from the shell In the radiation-to-sound-fever converter, at least a
part of nil 7 has a plurality of projections.
Next, the present invention will be described in detail with reference to the drawings showing the
embodiments. '41 is a perspective view showing the configuration of the first embodiment of the
present invention, FIG. 2 is a perspective view showing the configuration of the second
embodiment of the present invention, and FIGS. 3 (a) and 3 (b) are It is explanatory drawing
which shows the relationship between the shell of this invention, and a protrusion part. First, the
outline of the embodiment of the present invention will be described with reference to FIG. In the
above-mentioned equation (1), increasing the size of the shell in lowering the natural frequency
of the electric sound 9 converter (ie increasing the total length of the shell by 48 oi) and
uniformly making the thickness of the shell Thinning (i.e. reducing the thickness hd of the shell)
was said to be problematic in terms of handling and water pressure resistance. Therefore, there
are two points to lower the frequency from the equation (1): to decrease the Young's modulus E
and to increase the density ρ. These are all constants inherent to the material of which the shell
is made, so once the material is determined, it is uniquely determined. However, among these,
with regard to the density 見, it is possible to increase the apparent density by leaving or simply
adding a portion that protrudes to the inside of the shell during cutting. The structure and
operation of the first embodiment of the present invention will now be described. Referring to
FIG. 1, a first embodiment of the present invention is provided with an electrostrictive element 1
and a shell 2 and provided with an arrow raising portion 3 inside the shell 2. The electrostrictive
cord 1 is stacked in advance by a limited number, and a voltage of the natural frequency of the
electrical precursor converter is applied from the power source to expand and contract in the
same direction in the same phase. Send the vibration to the part showing 2b). As a result, as
shown in FIG. 4, the portion of the shell corresponding to the short diameter (length 2a) vibrates
in a loop, and the sound wave is emitted to the water in contact with this. The protrusions 3 are
slot-shaped as shown in FIG. 1, but the details of the cross section can be seen in FIGS. 4 (a) and
1b), and the distance between the protrusions is compared to the width of the protrusions If the
expansion and contraction of the shell itself by the tensile strength is determined by the
thickness hd of the shell itself, the effect of the projection is small, and the mass of the projection
acts as a force on the vibrating shell. Density increases. For example, if the shell of thickness
1cIIL has 5 (the protrusion of width 1α height 5crIL every 1m, it has the same mass as the shell
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of thickness 2cIIL, and the expansion by tension and the contraction by compression can be
calculated as thickness 1clIL So the apparent density is twice the Wlffi of the shell as a result.
Therefore, in this case, the resonance natural frequency is 1⁄2 compared to when there is no
protrusion. Next, the configuration and operation of the second embodiment of the present
invention will be described. Referring to FIG. 2, the second embodiment of the present invention
comprises an electrostrictive cord 11 and a shell 12, and a projection 13 is provided inside the
shell 12. The electrostrictive cord 11 is stacked in advance by a limited number, and a voltage of
the natural frequency of the underwater -f9i1 duster is applied from the power source to expand
and contract in the same direction in the same phase. The vibration is transmitted to the part
showing the length 2b). As a result, as shown in FIG. 3, the portion corresponding to the short
diameter (length 2a) vibrates in a loop, and the sound wave is radiated to the water in contact
with this. The details of the projection 13 are the same as in the first embodiment, but the
structure of the shell 12 is different from the first embodiment. The contents thereof are such
that the thickness of the shell gradually decreases from the portion corresponding to the major
axis (length 2b) to the portion corresponding to the minor axis (length 2a). In this case, since
lowering the natural frequency without lowering the water pressure resistance is implemented
under a certain limitation, the provision of the projection on the inner side of the shell further
increases the underwater sound The natural frequency is capable of metalworking. [Effects of the
Invention] The electric sound n converter of the present invention can be provided with a
protrusion on the vibrating shell and can be provided as a calorific rod, so that the natural
frequency can be lowered and a low frequency is obtained even with the same magnitude There
is an effect that it can be used efficiently.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a perspective view showing the opening of the first embodiment of the present
invention, FIG. 2 is a perspective view showing the configuration of the second embodiment of
the present invention, and FIGS. 3 (a) and 1b) are the present invention. FIG. 4 is an explanatory
view showing an operating condition of the shell, and FIG. 5 is a perspective view showing an
example of a configuration according to the prior art.
1.11,31 ...... electrostrictive element, 2,12,32 ...... shell, 3.13 ...... protrusion. ・ ・ ・ ・ ・ ・ \
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Attorney patent attorney Uchihara '\ 晋 JI N N-2nd Fig. 3 Conclusion
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