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JPS5643897

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DESCRIPTION JPS5643897
Description 1, title of the invention
Whistled transducer
3. Detailed Description of the Invention The present invention relates to an electroacoustic
transducer for an actop sonar, and more particularly to an electroacoustic transducer used for
sounding of seabed from shallow depth to deep depth. Conventionally, as the electro-acoustic
transducer of this type, a high resonance frequency is used to increase the resolution at shallow
depths using multiple resonance frequencies, and a low resonance frequency is used to extend
the sounding distance at depth. In general, it is common to use the primary and secondary
resonance modes of a rod-like vertical vibrator to obtain a plurality of resonance frequencies. In
this case, in order to obtain sharp directivity with an electroacoustic transducer using a vertical
vibrator in order to make the end face of the 8'i'c type vibration element a sound emitting
surface, a large acoustic radiation area is obtained. I was relieved, and I had the disadvantage of
requiring a large number of vertical speakers. In addition, a 't <Gin-to-noise converter
(hereinafter, referred to as a ?barbed transducer?, which is composed of a cylindrical vibrator
and a bowl-shaped ring reflector which reflects a prayer wave. ) At the resonance frequency of
the number of resonances, in contrast to the advantage that the area of the opening surface of
the acoustic radiation area, i.e. There is a drawback that in order to use it, a plurality of
cylindrical transducers with different outer diameters and a fluffer are required. The present
invention eliminates the above-mentioned drawback of EndPage: 1 by using cylindrical vibrators
of two or more known with different outer diameter and substantially the same size but different
vibration modes so that a plurality of resonant frequencies can be used with one rector. The
present invention provides a wrinkled transducer. That is, when the conventional differential
transducer is used at two or more types of frequencies, it is necessary to meet the dimensions of
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the cylindrical vibrators having different outer diameters and the vibrators of the respective ones
using respiratory vibration of the same vibration mode. In the present invention, the outer
diameter is made to be the same size, and a plurality of types of resonance frequencies can be
used in one type of 7 rectors by using vibrators having different vibration modes as opposed to
using a plurality of sets of folding or bending. It is an implementation of a transducer. The
present invention relates to a first cylindrical vibrator for respiratory vibration, and at least the
first cylindrical vibrator and t? F, a second cylindrical vibrator or cylinder of seventy or more
types that has approximately the same outer diameter size and has one or more vibration nodes
between the outer surface and the inner surface and vibrates in a higher vibration mode A
plurality of cages comprising means for concentrically stacking and arranging the transducers
and a common bowl-shaped reflector for reflecting the sound waves radiated from the two or
more types of circular f2 transducers to change the direction of the sound waves Be able to use
at the resonance frequency of tF! It is a hooked transducer with j features.
Next, embodiments of the present invention will be described with reference to the drawings. FIG.
1 shows a side cross-sectional view of an embodiment according to the present invention, in
which first cylindrical vibrators 1a to 1d used for respiratory vibration and second cylindrical
vibrators 2a to 2d vibrating in higher order vibration modes are used. Through the cushions 3a
to 31 that shield the vibration, the load 4 is fixed to the reflector 6 with the shaft 4 and the nut 5.
A rouling 7 for water honey is contained in the canned portion of the shaft take-up flapter, and
an outer cover 8 for watertightness is wound around the outer surface of the laminated
cylindrical vibrator. The first and second cylindrical vibrators are connected to a connector 9 at a
lead edge 10 so that input and output of electric signals are performed from this connector. In
the cylindrical vibrator of the crucible 1, the inner and outer surfaces vibrate in the same radial
direction r as shown in (a) of FIG. 2 and the liquid level ?r between the inner surface and the
outer cylinder as shown in (b) of FIG. There is a uniform so-called respiratory oscillation. In the
second cylindrical vibration exciter, the inner and outer surfaces vibrate in opposite directions as
shown in (a) of FIG. 3, and the displacement of + = j between the inner and outer surfaces
becomes zero as shown in (b) of FIG. It vibrates to create a node of narrative. The resonant
frequency of the second cylindrical vibrator is higher than the resonant frequency of the first
cylindrical oscillator LLt, and the ratio is about 3 times or more, and can be adjusted by the inner
diameter of the cylindrical vibrator of ? 2. The height dimensions of the first and second
cylindrical vibrators should be kept low enough not to cause coupled resonance in the same
vibration mode as the high and low vibration modes, but the drawings are explained Is a
simplification. Using a transducer according to this embodiment at a low frequency frequency If
a signal of the same frequency as the resonant frequency of the first cylindrical vibrator is
applied from the connector, the first cylindrical vibrator will breathe as shown in FIG. The
vibration is conducted, and the sound wave on the outer surface of the vibrator generated by the
vibration is spread to the light deflector, and then reflected and emitted from the opening surface
of the 7 rector. When the transducer according to the non-embodiment is used at a high
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frequency, if the same signal wave number as the resonance frequency of the second cylindrical
vibrator is applied from the connector, the 25th cylindrical vibrator has the third frequency. As
shown in the figure, the respiratory vibration Ii and / I are conducted, and the sound wave on the
outer surface of the transducer generated by this vibration is spread with a light fleece and then
reflected, and it is emitted from the aperture surface of the 7 rector. As described above,
according to the non-embodiment, the resonance frequency of the two ears can be used with a
pair of hooked transducer comprising two types of cylindrical vibrators and one piece of 7
rectors. Although two types of frequencies have been described above, it is apparent that higherorder modes should be used in combination on the same principle also in the case of three or
more types.
In the present invention, as described above, cylindrical vibrators having the same number of
outer diameters but different vibration modes are concentrically stacked and arrayed, and sound
waves of different frequencies radiated from the respective cylindrical vibrators are commonly
used. By changing the direction of the sound wave by the wedge-shaped reflector, sound waves
of a plurality of types of frequencies can be efficiently transmitted and received by a single set of
transducers. ?????????? ?
4. Brief description of the drawings. FIG. 1 is a cross-sectional view of an embodiment of the
present invention showing an example of one bm of the present invention, and FIGS. 2 (a) and 2
(b) are cylindrical vibrators 1a to 1d shown in FIG. 3A and 3B show the state of respiratory
vibration and the distribution of displacement, and FIGS. 3A and 3B show the states of high-order
vibration modes of the cylindrical vibrators 2a to 2d shown in FIG. And the distribution of
displacement. 1a to 1d иииииии Cylindrical vibrator, 2a to 2d ииииииии Cylindrical vibrator, 3a to 31
иииииииииииииииииииииииииииииииииииииииииии Shaft, 5 иии .......... 7- 2nd section + ar1 Figure 3 EndPage: ?
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