JPH02214399

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DESCRIPTION JPH02214399
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
transducer, and more particularly to a low frequency, high efficiency, high water pressure
resistant, compact and lightweight transducer for use in a sonar. [Background Art]
Conventionally, as shown in FIG. 3 as an example, in this type of transducer, a plurality of
cylindrical vibrators 3c are laminated as an electromechanical transducer, and an insulating
sheath 4A is formed on the outer surface or the inner and outer surfaces. Had a structure. And in
order to obtain transmission sound pressure especially, the transmission frequency was set and
used using the resonance by the respiratory vibration mode of the cylindrical vibrator 3c.
[Problems to be Solved by the Invention] The above-mentioned conventional transducer has a
structure in which a plurality of cylindrical vibrators 3c are laminated, and in this case, the
rigidity of the cylindrical vibrator 3c is high, so resonance is caused. The frequency is increased,
and if the resonance frequency is lowered, the outer diameter is increased and the weight is also
increased. Further, when used at a low frequency apart from the resonance frequency, the power
factor of the mechanical impedance is deteriorated and the electromechanical conversion
efficiency is lowered. As a result, a high transmission sound pressure can not be obtained.
Therefore, in order to lower the rigidity of the electromechanical transducer and obtain a low
resonant frequency, as shown in FIG. In some cases, the sound is transmitted from the outer
surface, and the inner surface has a structure sealed by a sound case 8 in order to prevent a
short circuit phenomenon of reversed phase sound waves. However, if the inner surface of
diaphragm 6 is made into an air chamber in order to completely prevent a short circuit
phenomenon, the rigidity of diaphragm 6 is low and therefore the water resistance can not be
increased. If you try to make a sound wave from the inner surface of the diaphragm 6 with the
sound case 8 or sound it, the thickness of the sound case 8 becomes large due to the low
frequency, and the size and weight increase increase. is there. An object of the present invention
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is to provide a compact and lightweight transducer having low frequency, high efficiency, high
water pressure resistance. [Means for Solving the Problems] The transducer of the present
invention divides a cylindrical elastic band having a length of about half wavelength to 1
wavelength of the used sound wave by at least four dividing lines parallel to the central axis. A
cylindrical diaphragm provided with at least four divided diaphragms formed, the two support
rings for respectively fixing the ends of the divided diaphragms at both openings of the
cylindrical diaphragm, and the outer surface A cylinder that vibrates in response to the input
electric signal and contacts with the inner surface of each divided diaphragm that enters inside
by a predetermined distance from both opening faces of the cylindrical diaphragm and transmits
this vibration to each divided diaphragm And a cylindrical diaphragm, a support ring, and an
insulating sheath covering the surface of the cylindrical vibrator.
Next, an embodiment of the present invention will be described with reference to the drawings. 1
(a) to 1 (d) are a perspective view, a cross-sectional view, a top view and a partial cross-sectional
side view showing an embodiment of the present invention, respectively. In this embodiment, a
cylindrical elastic body such as a metal or a synthetic resin having a length of about half
wavelength to 1 wavelength of a sound wave used is divided by 12 dividing lines in parallel with
the central axis. The divided vibration of the cylindrical diaphragm 1 provided with the divided
vibrators 11 ^ to IIL and the tapered screws provided at the end portions of the divided
diaphragms 11 ^ to 11L at both openings of the cylindrical diaphragm 1 Two support rings 2A
and 2m for fixing the ends of the plates 11A to 11L, and the outer surfaces of the divided
diaphragms 114 to 11t having a predetermined distance from the both opening faces of the
cylindrical diaphragm 1 Two cylindrical vibrators 3 ^ + 3a that respectively contact the inner
surface and vibrate in response to the input electrical signal to transmit the vibrations to the
divided diaphragms 11 ^ to IIL, and the cylindrical diaphragm 1 ° support ring 2 ^ + 2 B and
cylindrical oscillator 3 A r 3 B It has the structure which has the insulating sheath 4 which covers
the surface. That is, the structure of the transducer according to the present invention generates
the flexural vibration of the cylindrical diaphragm 1 by the respiratory vibration of the highly
rigid cylindrical vibrators 3A and 3B and the supporting force of the support rings 2 ^ and 2a, As
a result, the rigidity of the radiation surface resonator, that is, the rigidity of the deflection of the
cylindrical diaphragm 1 is lowered to obtain low frequency resonance, and the sound wave
radiated to the inner surface of the cylindrical diaphragm 1, the cylindrical diaphragm (1) By
delaying the phase in the acoustic tube, which itself constitutes a partition, and propagating the
phase to the outside, the short-circuit phenomenon of sound waves radiated from the inner and
outer surfaces is prevented, and a highly efficient, compact and lightweight transducer is
realized. It is a thing. In this embodiment, the divided diaphragms 11 ^ to ILL are arranged in the
range between 2 'cylindrical pagoda 3 · · · · so that the side surfaces of the divided diaphragms 11
^ to ILL do not collide with each other by flexural vibration. A gap (about 0.1 to 1.0 inch) is
provided between them. In addition, contact surfaces of the divided diaphragms 11 ^ to IIL with
the cylindrical vibrators 3 ^ and 3a are counterbored to the divided diaphragms 11 ^ to lli so that
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displacement does not occur due to flexural vibration. Provide a cylindrical oscillator 3 ^. I have
inserted 311. The piezoceramics are magnetostrictive vibrators for the cylindrical vibrator 3 ^ +
3i + and the polarities of the two cylindrical vibrators 3A + 3B are matched and connected, and
the electric terminal is drawn out by the lead wire 5, and the cylindrical diaphragm 12 cylinder
Shape oscillator 3 ^, 3! An insulating sheath 4 for protection from seawater is provided by
molding or the like on surfaces such as inner and outer surfaces and end faces of the I and
support ring 2 ^ + 2a.
When an electrical signal of the same frequency as the flexural resonance of each of the divided
diaphragms 11A to 11t is applied from the lead wire 5, the cylindrical vibrators 3A and 3B
perform respiratory vibration, and radial direction on the contact surface of each divided
diaphragm 11A to 11t Add driving force. On the other hand, since the support ring 2 ^ 12B fixes
the end of the divided diaphragms 11 ^ to ILL, a bending vibration occurs in which the central
portion of the divided diaphragms 11A to ILL is largely displaced by the leverage. The
relationship between the displacement distribution and direction of the cylindrical vibrator 3 ^ +
3B and the cylindrical diaphragm 1 is shown by the dotted line and the dotted line in FIG. Due to
this vibration, sound waves of opposite phase are radiated to the inner and outer surfaces of the
cylindrical diaphragm 1, and the sound waves radiated to the inner surface are vibrated in the
same phase as the side wall of the acoustic tube (ie, the cylindrical diaphragm 1). It is propagated
to the upper and lower end faces without being transmitted through the diaphragm 1, and a
short circuit with the sound wave radiated from the outer surface is effectively prevented by the
phase delay due to the propagation time. In addition, since the gaps between the divided
diaphragms 11 ^ to 11t are small, it is possible to obtain a high water pressure resistant
transducer by thickening the insulating sheath 4 appropriately. [Effects of the Invention] As
described above, according to the present invention, a cylindrical diaphragm provided with a
divided diaphragm formed by dividing a cylindrical elastic body into at least 4 and both openings
of the cylindrical diaphragm are fixed. Support ring, and a cylindrical vibrator provided at a
predetermined distance from both open faces of the cylindrical diaphragm and in contact with
the inner surface of each divided diaphragm, and used for flexural resonance of each divided
diaphragm In addition, by constructing the acoustic tube by the cylindrical diaphragm, it is
possible to obtain a small-sized lightweight transmitter-receiver having low frequency, high
efficiency, high water pressure resistance, and the like.
[0002]
Brief description of the drawings
[0003]
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1 (a) to 1 (d) are a perspective view, a cross-sectional view, a top view and a partial crosssectional side view showing an embodiment of the present invention, respectively, and FIG. 2 is
FIG. 1 (a) to (d). The side schematic diagram for demonstrating the operation ¦ movement of the
shown Example, FIG. 3 and FIG. 4 is a side view which respectively shows the 1st and 2nd
example of the conventional transducer.
DESCRIPTION OF SYMBOLS 1 ... Cylindrical diaphragm, 2A, 2B ... Support ring, 3A-3c ...
Cylindrical vibrator, 4, 4 ^ ... Insulating sheath, 5, 5 ^ + 5B ... Lead wire, 6 ··· diaphragm, 7
····································································· Division diaphragm. Attorney Attorney Uchihara Moth
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