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JPS55144481

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DESCRIPTION JPS55144481
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional front view of a conventional
ultrasonic transducer, FIG. 2 is a sectional front view of an ultrasonic transducer according to the
present invention, FIG. 3 is a plan view thereof, FIG. FIG. 4 is a sectional front view of another
embodiment of the present invention, and FIG. 5 is a plan view thereof. 6 · · · · · · · · · · · · · · · · · · · · · ·
· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ultrasonic transducer,
11 · · · · · · baffle ····························· 13
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an ultrasonic
transducer which is integrally formed with a transmitting horn and a receiving horn.
Conventionally, an integrally formed one as shown in FIG. 1t is used for an ultrasonic transducer
used as a reflection type ultrasonic switch. This is a pair of horns 1.1 of the same shape, one for
transmitting and the other for receiving, arranged in parallel, and each horn 1 has a diameter
toward the opening 27 of the throat 27. The T6 ultrasonic transducer 4 has a short cylindrical
package attached to its throat portion 2 together with a gradually expanding T6 cone 1 / 2b ′
′ T, and the double horn 1. In the case where the transmission horn and the reception horn are
integrally formed in this way, it is advantageous in terms of molding or assembly, etc. In the case
of FIG. 1 described above, a part of the ultrasonic wave emitted from the transmitting horn
toward the object IC wraps around along the baffled blood between the two horns 1.1 and is
received. There is a so-called wraparound wave or a large withdrawal defect that is directly
received by the wave horn It was Therefore, as an ultrasonic switch f! In order to prevent the
occurrence of four phrases, it has been considered to set the distance between the two horns 1.1
larger with a phrase, while setting a certain insensitive term at the signal processing stage. If the
detection at the close distance is impossible, the C detection performance is deteriorated, and in
the latter case, there is a disadvantage that the transducer is enlarged. The present invention has
been made in view of the above-mentioned point, and it is intended to divide the integral JiEshaped baffle surface into each horn 22-V so as to divide 22-V. In order to reduce the above-
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mentioned wraparound wave and eliminate the above-mentioned inconvenience, it is TΦ.
Hereinafter, an embodiment of the present invention will be described based on the drawings.
The second garden and FIG. 3 show an example in which a concave groove is formed on the
baffle surface, and this ultrasonic transducer has a pair of self-shaped horns 6 one for
transmitting and the other for receiving. .6 or parallel is displaced and integrally molded of resin.
Each horn 6 has a diameter or a gradually expanding T6 conical shape toward the opening
portion 1) and the opening portion 8, and the cylindrical vibrator attachment portion 9 is
connected to the throat portion 7 and the connection portion The ultrasonic vibrator 1 ohms
inserted into the base is positioned by the aberration of. In this ultrasonic mobile unit 10, for
example, a pair of electrodes (electrodes are formed by vapor deposition on both surfaces of a
piezoelectric element, and this is attached to the upper and lower sides of a substantially
cylindrical package).
Furthermore, the two horns 6.6 each have an opening 8.degree. 8 integrally connected to the 0
baffle 11 as a substantially rectangular plate in an opening T65. Then, between the two openings
8.8, this baffle portion 11 is bent in a U-shape in cross section to form the concave groove 12
and is formed on the substantially square baffle surfaces 11a and 11a centering on the
respective horns 6.6. It is divided. Therefore, a part of the ultrasonic wave emitted from the one
transmission d acoustic wave moving member 10 toward the object becomes a wraparound
wave, and tries to see behind the openings 8 and 1) and so on. Once you move sideways along
the surface 11a or move around in the concave groove 12 and are absorbed here and partially
cut off by the 1IIil emperor of the concave # 12, one so-called 'MA sonic yarn It is received by
the moving child 10 and the six wraparound waves are significantly reduced. It should be noted
that the shape of both horns 6.6 and the distance thereof are set to the same one as the
conventional one that shows the first line: 1 Jl, and the result of comparing and measuring the 6
output levels of the same included is about It was also found that 30 減少 φ reduction T was also
effective. In FIG. 4 and FIG. 5, a convex wall 13 is formed at the center of the baffle portion 11
instead of the above-mentioned concave groove 12, and this is divided into two parts, "J full plate
11a, 11a)" 4-! As in the above-described embodiment, the rounding wave traveling along the
baffle surface 11 is limited to 6 嘲 16, and the received wave tl, /) reduces the rounding wave
significantly by T6. 60% reduced to the effect or clear in the explanation on O line 71) fc, this
invention heat lover 6 ultrasonic transducer i; %, The bore diameter gradually extends from the
part to the opening part T1 pair of horns in parallel-one pair of two holes, each opening f pile is
integrally formed as connection TQ with the same baffle, No) each one + Ql) 祁 こ 超 切 thing
equipped with ultrasonic low facets Φ thing T1. The above-mentioned baffle surface is attached
to each horn [a, b, t between the two openings q-a baffle 1 a ditch or a convex crest? で あ 7)) et
al., A wave horn cam or the like can be directly received on the horn so that the bending wave
can be made extremely small. Therefore, as an ultrasonic switch, the insensitive range can be
extremely small, power can be collected, the stage performance can be improved with a whistle,
and the distance between horns can be further reduced.
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