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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view of an example of the
present invention, and FIG. 3 is a longitudinal cross-sectional view of the structure of a die
showing its characteristics. FIG. 4 shows the structure of an ultrasonic transducer having a
resonance plate as a feature of the present invention. Numeral 44 indicates a radiation plate, 43
indicates a resonance plate, and 42 indicates a support. == 喬 λE == FIG. Fig. 1 fyq-. Rs ^ ˜ ρ 7
bF. , = F2. -2A 1-1 site 10 1 R, = 紅 −---t + Δ 1 K 3 two-posits---11-one site R 4 = hi.
+br−−−−−t −AtF? 5 = people +: wr---t-2 Δ 1-43-real opening 51 49 616 16 (2)
5th mouth 5th l-44 1
DETAILED DESCRIPTION OF THE INVENTION The present invention is characterized in that the
thickness of at least a part of the resonance plate of the ultrasonic wave transmitting / receiving
tool is changed to expand the resonance band. The following is a detailed description of the
figure. For example, the resonant frequency f of a general vibration mode of a resonant plate
having a uniform thickness in cross section with no external tension applied to a disc-shaped
resonant plate is shown. 0.412 Jt □ Qf = t, /, 1 expression%% expression (1 where, 這; thickness
of the resonance plate (a) R, = radius of the resonance plate (a) − − ′ ′ density of the
resonance plate (tr / Cd) σ = Poatoulin ratio Q-gin 2 ratio (dytμ / d) Conventionally, the cross
section of the resonance plate is shown in FIG. 1 and the relationship between the frequency at
the time of resonance and the sound pressure level is as shown in FIG. The sudden
characteristics, in other words the bandwidth of the resonance frequency, can not always be
obtained, which causes problems in transmitting or receiving multiplexed ultrasonic signals. The
present invention provides the results of various studies to expand the width of the resonant
frequency band of the resonant plate. As shown in FIG. 2a, an example of which is a crosssectional view with part enlarged, as indicated by A in FIG. 2a, a radius is provided on the outer
peripheral portion to make the thickness uneven as a non-flat portion of the resonance plate.
Describe. In the above equation (1), RQ and A correspond to RQ ± 2 Δτ difference ± 2 with a
likelihood width of 2 respectively to obtain an ultrasonic transmitting and receiving resonator
plate with a width of resonant frequency band as shown in Fig. 2. Can do. A specific method of
manufacturing is as follows. When a disc made of a predetermined material is punched out, the
gap between the die and the punching punch is relatively large. For example, 0.05% or more is
used when using a 0.4% thick flat plate made of aluminum material. The purpose is easily
achieved by providing an extremely small radius in the tooth portion of the die as shown in FIG.
The resonant plate thus obtained is shown in FIG. 4 as an example in a longitudinal sectional
view, and is provided with a support plate 41 having elasticity, a transducer 42 on the -plane and
a <14 恰 radiation plate 43. The ultrasonic transmitting and receiving tool equipped with the
resonance plate 44 which is not uniform is a wide resonance band width, in other words, a wide
frequency band width (capable of transmitting and receiving multiple signals without hindrance).
It is worthwhile.