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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view of a conventional conetype reflector-mounted transducer, FIG. 2 is a cross-sectional view of an embodiment of the
present invention, and FIG. 3 is an acoustic view of FIG. FIG. 4 is a schematic view of a radiation
surface, and FIG. 4 is an explanatory view of another embodiment of the present invention.
DESCRIPTION OF SYMBOLS 1 иии Cone-type reflective plate, 2 иии Mold, 3 иии Hardware, 4, 5.6.7 иии
Element, 11 иии Cone-type reflective plate, 12 иии Mold, 13 иии и и Hardware, 14.15.16 и и и element
(resonance fL), 17.1 B, 19.20 и и и element (resonance fH), a и и и (size (the outer radius of the
radiation surface of the element of resonance fL B) Size (outside radius of the radiation surface of
the element which becomes resonance fH) C: Outer diameter size of the transducer.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a transducer
having the same sound directivity and different sensitivities, with the best sensitivity at each
resonant frequency. A conventional cone-type reflector-mounted transducer is shown in FIG. In
FIG. 1, 1 is a cone type reflector, 2 is a mold material, 3 is a metal fitting, and 4 to 7 are
transmitting / receiving elements (configured and directional transducers, which change the
operating frequency. There are the following disadvantages when using it. 20 LIG (1)-/ 7 /? If the
?, l, i, near (i)? frequency is changed, the same directivity can not be obtained. That is, in order
to obtain the same pointing width at different frequencies, separate transducers must be used. (B)
When the wave number changes, the transmission / reception sensitivity drops compared to 5 of
the resonance point. The object of the present invention is to solve these drawbacks, which will
be described in detail below on the combination of elements with different resonant frequencies
on an axis. FIG. 2 shows a first embodiment of the present invention, in which 11 is a core 10type reflector, 12 is a molding material, 13 is a fitting, 14-1 .alpha. An element 20 has a high
resonant frequency fil. Here, the elements 14 to 16 are driven at a frequency which is nine. At
the two frequencies of 15 and 9 and fL, therefore, the same best directivity and sensitivity as the
resonance point can be obtained. As described above, in the first embodiment, since the elements
are driven at respective resonance frequencies, driving at a plurality of frequencies can be
performed with good sensitivity. 20 (2) 907) ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?
? ? ? ? ? ?The directional beam and the directional beam when driving the region
(company) in 9 are advantageously the same. Also, it is of course possible to make each
directional beam to have an arbitrary beam width. Although the first embodiment has described a
cone-type reflecting wedged transducer as a transducer, a transducer as shown in FIG. 4 is also
possible. FIG. 4 shows a combination of a cylindrical element having an outer diameter a1 and an
outer diameter a1, and a cylindrical element having an outer shape, each of which is provided
with a glaze. Here, if the dimensions of a and b are properly determined, the same effect as the
first embodiment is produced. In the present invention, since the acoustic center is the same and
the directional beam is also the same, the processing for the position of the acoustic center and
the processing for the directional beam are easier than in the case of using the conventional
transducer. It is.
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