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JPS55162490

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DESCRIPTION JPS55162490
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view showing the structure of a
conventional ultrasonic transducer, FIG. 2 is a sectional view showing the structure of an
ultrasonic transducer according to the present invention, and FIG. It is an expansion half
sectional view of a sound wave vibrator. 8 · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·
· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ultrasonic transducer, 12 · · · ·
throat.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an ultrasonic
transmitter-receiver which comprises an ultrasonic transducer and a horn, and more particularly
to the improvement of horn picking. Conventionally, the constitution shown in FIG. 1 has been
adopted as a liquid transmitter or receiver of a supersonic 1 anti-switch which is frequently used
as a door switch or a level switch. More specifically, 1 is a horn integrally formed of synthetic
resin, and (1) 71,211 P ρ diameter gradually increases from the throat portion 2 toward the
opening portion 5 and a cylindrical copy circle is further formed on the throat portion 2) The
ultrasonic vibrator 6 is fitted to the vibrator mounting portion 4 from above with the elastic
member 5 interposed therebetween, and the terminal 7 is led out to the lower periphery and the
lower part of the ultrasonic vibrator 6. 7 rubber yarn cherry, a agent is filled and fixed. This
ultrasonic transducer 6 is. While attaching a piezoelectric element to the inside of the upper
bottom of a cylindrical cap with a bottom and closing the open bottom with a disk-shaped base, j
is a vibrating surface and 9 The circumferential side also vibrates in the radial direction, and
from this point as well, there is a feature that sum acoustic waves are generated. Therefore, with
this conventional structure, is the sum siding wave generated on the circumferential side of the
former not used at all? There is a defect that interferes with the ultrasonic waves from the top
and bottom toward the object, resulting in vibration loss and actually reducing the back pressure
of the ultra-speaking wave toward the object, so-called efficiency as a transmitter or receiving
liquid The sensitivity of the vessel was low. This device was made in view of the above points,
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and the purpose is to reflect the side vibration as well as the @ surface vibration of the ultrasonic
transducer to (2) and efficiently utilize the ultrasonic wave. It is. For this purpose, this invention
is designed to fix the fixed base of the ultrasonic transducer at the throat if relieved. Due to this
configuration, the Tochigi device transmits the ultrasonic waves that are emitted in the radial
direction of the wave S motion or not as a vibration loss, but they are used as effective ultrasonic
waves because they are reflected by the radiation surface of the horn. It has the effect of
improving the sensitivity as an i-conversion rate as a receiver or as a receiver. Hereinafter, an
embodiment of the present invention will be described. FIG. 2 shows an example of the ultrasonic
transducer according to the present invention. The horn 8 integrally molded by 9 synthetic trees
is directed from the throat 12 to the opening 13 at the tip. As the diameter gradually increases, a
cylindrical vibrator attachment portion 29 having a diameter larger than the diameter of the
throat 12 is connected to the throat 12 and penetrates from the opening 16 to the proximal end .
An ultrasonic transducer 9 having a diameter slightly smaller than that of the throat portion 120
is attached to the horn 8.
(6) As shown in FIG. 3, the sound wave perturbator 9 adheres the piezoelectric element 16 to the
inside of the upper bottom surface of the bottom cylindrical cap 15 made of aluminum or the
like, and the lower edge thereof Are bonded to the ring-shaped base 18 via the elastic material
17 of the sponge temple, and the terminals 19. The opening is closed by the terminal block 20
on which the '19 is erected, and when a high frequency voltage is applied between the electrodes
41 attached on both sides of the piezoelectric element 16, the piezoelectric element is used. It
vibrates integrally with the cap 15 to generate an ultrasonic wave. Further, as described above,
ultrasonic waves are emitted in the radial direction also from the surface of the cap 15. On the
other hand, it is assembled so as to be opposed to the throat 12 of the base 20r horn 8 of the
ultrasonic wave vibrator 9 and 9 is assembled. The entire surface of the back is filled with a resin
such as a rubber adhesive or silicone rubber to fix the filter. Accordingly, the surface of the
ultrasonic transducer 9 faces the radiation surface 10 of the horn 8 at a predetermined angle.
The light 7 emitted from the side is reflected by the radiation surface 10 and emitted toward the
@ 1 surface of the horn 8. (4) A large power can be obtained as the efficiency of the wave
transmitter or the sensitivity of the wave receiver. In this embodiment, the vibrator 9 and the
horn 8 are fixed with a resin such as silicone rubber, or the base 20 of the vibrator 9 is pressed
from the lower portion of the horn 8 with a beta plate or the like. You may fix this with a his.
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