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The present invention relates to an ultrasonic transmitter-receiver. Although the shape includes
not only round shapes but also polygons, the text mainly describes objects using representative
round ceramic bodies. A large number of transmitters / receivers in the ultrasonic band are
conventionally known, and such ones are obtained by joining two ceramic plates, or one with two
ceramic plates. "J A sandwich-like one, or a ceramic plate on which a resonator plate and a
radiation M, I tool are joined, or a jig for performing phase control at a predetermined position
instead of a radiation rod Those are the main ones, and they are all larger in size, inferior in size
and thinner than the transceiver according to the present invention. In particular, the transceiver
of the present invention has a center frequency much smaller than that of the conventional
transceiver in the 18 KHz to 40 KHz band, and can be 60% or less in area. Hereinafter, the
contents of the present invention will be additionally described in detail from [2]. The center
frequency is selected and described as 25 KHz. The structure of this ultrasonic transmitterreceiver is as shown in FIG. 1 in the form of a circular resonant plate 11 and a circular and
polygonal porous ceramic body 21 in which the lead wire 61 is taken out of the electrode to the
polygonal resonant plate 12. 22 is bonded to a resonance plate, and a vibration N body (a
ceramic body and a resonance plate are bonded) is bonded to the vibration mother support
portion 41 of the haze 51 using an adhesive 31 and a lead wire is connected to a terminal 71 It
is. According to this structure, by using the perforated ceramic body, the resonance frequency of
the vibration f'J body is adapted to the target frequency band b) and the size of the conventional
non-porous vibration 747 body is 17 judiciously small. It is possible to vibrate the resonance
plate joined to the portion of the hole, and to obtain the sound pressure and the sensitivity
instead of the radiation. Hereinafter, the ring-shaped ceramic body representative of the present
invention is used to describe j-i) a). As shown in FIG. 2, i.e. Let rl be the inner diameter-[, the ratio
r2 / r 1 of it is lly on the horizontal axis, l! If the merit of the characteristic 1 is taken as the
vertical axis with J 1 iii l = 41 j, the result is as shown in FIG. If the diameter and diameter of the
ceramic body are ↓ l: r 2 / r i r 1.4> r 2 / rl, the size of the excited body with respect to the load
of the ceramic body with the body is an overload. As a result, the characteristics of the finished
transmitter-receiver deteriorate and can not be used for one use. When 2.8 <r 2 / rl, a large area
of the resonance plate is joined and adjusted to a predetermined frequency (If it is not 1, there is
a need to reduce the size).
The difference between f and f is no longer seen, and it is impossible to see the difference from-to
the H part of the hole. Will decrease. Among the conventional products, there is also a product
which is used for forming holes for the purpose of bonding radiation to the center of the ceramic
body. However, in the application of the hole of the present invention, the resonance frequency is
adapted to the target frequency band, so that the size reduction is legally reduced, and ■, one,
the resonant plate which is bonded to the hole portion Because the purpose is to vibrate, n
pressure, to obtain sensitivity, instead of radiation, the application is completely different from
the former. In other words, the holes of the conventional perforated plate are filled with metal
and / or adhesive agent C, so that the miniaturization effect of the present invention can not be
obtained. In the following, r2 / rl selects 19 for the ceramic body / body and describes one
thousand. J (speaker + (select the quality is free to meet the design requirements of the
transducer. = 3-For example, ■? Lamic, metal aluminum stainless steel. It is a titanium plate etc.
However, this time, in order to mainly use a thin resonance plate, it was decided to use a
combination of stainless steel and plastic with a low rigidity: + i4 stainless steel for spurious pullin. Now, assuming that the diameter of the resonance plate is r3, the ratio r3 / rl to the inner
diameter r1 of the ceramic body is taken on the horizontal axis, and the manufacturing is 1 .
It is shown in the figure. When r3 / rl <1.1, (joining of the ceramic body and the resonance plate
becomes difficult, and there is a structural problem, and when r3 / rl> 3.3, the conventional
product when it is geometrically finished There is no difference in the law, and it goes against
miniaturization, there is no value, and the merit 1 will fall. In addition, as shown in FIG. 4, when
the ratio t2 / l1 of the thickness t1 of the ceramic body to the thickness t2 of the resonant plate
is 0.2> t2 / ll, the resonant plate becomes abnormally thin. The resonant plate locally generates
abnormal vibration, so that electrical problems easily occur and characteristically degrades. t2 /
ll> 1. . In the case of (5), in order to adapt the vibration frequency of the vibration / iJ body to the
target frequency band V, it is necessary to join with the one having a large area of the resonance
plate. Therefore, there is a problem because the method can not be miniaturized. Next, as the
method 1 is miniaturized and the area of the vibration body 14 can be made 60% or more of that
of the conventional product, the directivity characteristic is as shown in FIG. It is found that the
directivity characteristic half angle is 15 to 30 wide characteristics wider than that of the
conventional product (solid line).
Second, as shown in FIG. 6, at least two pairs of the ultrasonic transmitter-receivers are arranged
in pairs as shown in FIG. As shown, the transmitter / receiver (dotted line) has no possibility that
the central part of the directional characteristic is broken and drops as in the conventional
product (solid line), and the directional characteristic half angle may be narrowed by 10 ° to 20
°. It turned out that it is possible. Note that using transmitters and receivers in combination and
in multiples is γfv! 11) Described in a) (issue of modern harmony 1 study 71). 〜J1でいイ)か
1. Kneel tl, let, i'r sound path length difference 31-a) phase difference, and non-uniform
directivity 1'l [1-1-(1)] Directionality 171, squeezing [I-like (", it is a totally different mechanism.
Also, as shown in FIG. By the v between the centers of 11 ultrasonic transmitters / receivers T (to
make p 1 ^ ^, especially 0.8λ −-), ρ [1 く in FIG. It is possible to take a very large ratio of = 1beam to zido []-zo. In FIG. 8, when -C and p are less than or equal to 08λ, they are indicated by a
dotted line, and when か or λ or more by a solid line t051, the ultrasonic transmitter-receiver
and the composite ultrasonic transmitter-receiver according to the present invention It is
expected to be used industrially in the future (ITF is very promising).
Brief description of the drawings
1 shows the structure of the ultrasonic transmitter-receiver according to the present invention in
FIG. 61, FIG. 2 shows the relationship between the outer diameter and the inner diameter of the
ceramic body, and FIGS. 3 and 4 show the ceramic body. And + r (the relationship between the
diameter of the resonance plate and the thickness j).
FIG. 5 shows a comparison of the directivity characteristics of this ultrasonic transmitter-receiver
and a typical conventional product. FIG. 6 shows 11 methods of the arrangement (I) in the
composite ultrasonic transmitter-receiver. ている。 FIG. 7 shows a comparison of directivity
characteristics when the composite ultrasonic transmitter-receiver and the conventional product
are used as a composite type. FIG. 8 shows the (-) finger directivity in the difference in the
spacing of the array of the composite ultrasonic transmitter-receiver.