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JPS5687788

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DESCRIPTION JPS5687788
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 and FIG. 2 are cross-sectional views showing the
structure of a conventional ultrasonic transducer, and FIG. 3 is a perspective view showing the
entire structure of the ultrasonic transducer according to the present invention, FIG. 4 is a
sectional view taken along line 4-4 in FIG. 3, and FIG. 5 is a sectional view showing another
embodiment of the present invention. 11 · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·
· · · · · · · · · · · · · · · · · · ·? Parts 17 17 ultrasonic transducers 18 elastic material rings 19 sleeves 20
resin 22 22 0 ring, 23.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an ultrasonic
transducer comprising an ultrasonic transducer and a horn, and relates to 1% of its waterproof
structure. As a transmitter or receiver of an ultrasonic switch which is often used as a door
switch or a level switch, the structure shown in FIG. 1 is conventionally employed. More
specifically, the friend horn 1 integrally formed of a resin molded body gradually expands in
diameter from the throat 2 to the opening 3 and a partition wall for attaching the ultrasonic
transducer 4 to the back of the throat 2 5 is formed. The terminal of the ultrasonic transducer 4
penetrates through the elastic member 6 formed of the partition 5 and the sponge, etc., and
further, the resin such as a rubber adhesive is spread over the entire lower portion of the
positioned t'L7j ultrasonic transducer 4 7 to fill. As a result, in addition to the positioning and
fixing of the ultrasonic transducer by the filling resin, it is made waterproof. In such a
configuration, the positioning of the ultrasonic transducer 4 is extremely limited by the leak that
is performed by the leaker. The characteristics of the device are likely to vary. Moreover, in order
to fill the resin around the ultrasonic transducer 4, its gap is small, and if it adheres to the upper
part of the imaging actuator, its operating characteristics will be adversely affected. In addition to
poor work efficiency, it also has the problem that it is not easy to fill it and y + lt9 is uneven 9
and its waterproof reliability is poor. Therefore, in view of the above-mentioned points, the
present applicant has proposed I.sup. + Developing the structure shown in FIG. This is apparent
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from the same figure. The back of the same diameter cylindrical portion 8 of the horn 1 [Further
expansion aperture portion 9 '! i? An elastic member 6t-fit like a sponge for holding the
ultrasonic transducer 4 in a row and connected to the enlarged aperture 9 is provided. Then, the
resin layer 7 is filled and formed on the entire bottom surface of the bottom surface of the
ultrasonic transducer 4 and the IC has a waterproof effect in combination with the fixation of the
ultrasonic transducer 4. In such a structure, if the positioning of the ultrasonic transducer with
respect to the horn is correctly made, it is 3-series. Both have the advantages of being able to
easily carry out the mounting work and of being able to obtain the child's waterproof effect of
the butterfly ultrasonic transducer itself in the normal use NIC. On the other hand, the resin filled
with the above-mentioned enlarged diameter portion 91C is easily shrunk due to the change of
the ambient temperature and the secular change, and it is difficult to maintain its waterproofness
for a long life VC @.
In particular, in consideration of the fact that the transducer is installed in an atmosphere
condition (a place where it is not immediately (for example, used as a level detection means for
powder, liquid, etc.)) (For example Delrin. In the case of using Duracon or the like, it is difficult to
maintain waterproofness in 11c because of poor adhesion to the above-mentioned light jJA resin.
In addition, it is possible to use adhesive and chemical resistance (immediately epoxy resin gold
as an nfc material, but because it is a thermosetting resin, it is a butterfly-friendly material for
molding relatively large parts such as horns) It takes time, is suitable in terms of formability and
does not have a butterfly. This invention was made to solve the problem A as described above,
and its purpose is to accurately position the ultrasonic transducer with respect to the horn i. The
present invention provides a Hakusou ultrasonic transducer capable of maintaining complete
waterproofness even under adverse conditions I. Next, an embodiment of this consideration will
be described in detail with reference to the drawings. FIGS. 3 and 4 show one example of the
ultrasonic transducer according to the present invention, and the horn 11 integrally formed with
the polyacetal tree JfrlKL recase gradually increases in diameter from the throat 12 toward the
opening 13. Then, a cylindrical portion 14 having a constant diameter is extended from the
throat portion 12, and a concentric enlarged diameter portion 15.16 is further connected to the
cylindrical portion 14 in a stepwise manner, It penetrates from 13 to the back of the case. The
ultrasonic transducer 17 disposed in the enlarged diameter portion 15 at a predetermined
distance t (for example-wavelength of 8 degrees) from the throat portion 12 mentioned above
enters and exits the center of the elastic material ring 18 constituted by a sponge or the like. The
elastic ring 18 is fitted and supported by a sleeve 19 fitted to the enlarged------------------------------------------------------------------------------------------------------tongue shaft section) portion. Then, the entire
bottom surface of the elastic material ring 18 including the vibrator bottom N (a rubber material
such as silicone rubber, silicone rubber, etc. 111i 120 t-1 is filled, the upper surface of the
ultrasonic transducer 17 is elastic material ring 18 j? The resin is positioned and fixed so as to be
flush with the upper surface of the sleeve 19. Furthermore, in view of the contactability and
waterproofness with the resin 20 described above, the sleeve 19 is a phenolic resin or a resin
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having a particularly high affinity. It is made of epoxy resin etc. The lower peripheral portion of
the outer periphery of the sleeve 19 has a thin and small diameter as shown in FIG. 4, and a
relatively deep peripheral groove 21 is formed between the outer peripheral portion and the
enlarged diameter portion 16. The lower portion is V-shaped by forming the boundary portion
between the large diameter portion and the small diameter portion of the elastic ring 18 and the
boundary portion of the enlarged diameter portion 15.16 into a taber shape.
Then, the above-mentioned circumferential groove 21fCO ring 22 gold is attached, and the Oring 22 is pressed against the upper bottom portion of the circumferential groove 21 in order to
load the upper surface 19 pressing ring 23ft, sleeve ==-6; Sealing the space between the second
wall and the inner wall of the enlarged aperture s15. Incidentally, the pressing IJ song 3 is
integrally fixed to the back of the seventeen rank portion 23 (19 times after applying the IK
ultrasonic bathing. With the above configuration, the gap between the elastic material ring 18
and the sleeve 19 is sealed against the filling resin 20, and the gap between the sleeve 19 and
the inner wall of the enlarged diameter portion 15 is sealed by the O ring 22. The penetration
progress of water reaching the back surface of the ultrasonic transducer 17 is cut off to
completely protect the waterproof structure, the vibrator and other @ path components.
Therefore, the installation work company of the ultrasonic transducer 17 can perform all the
processing of the horn 11 based on S *, so that the workability is enhanced and the ultrasonic
transducer is fitted by fitting the inner and outer periphery of the elastic material ring 18 The
center of the horn 17 and the center of the horn 11 are accurately regulated, and the positioning
of the center of the elastic ring 18 is easily and accurately made to coincide with the front face of
the elastic ring 18, and the characteristic as an ultrasonic transducer varies. Does not occur. FIG.
5 shows another embodiment of the present invention, and in particular, the pressing ring 23
and the horn 11 are fixed without using ultrasonic welding rC. In the same figure, the same parts
as those in the embodiment described above are denoted by the same reference numeral, and the
detailed description thereof will be omitted. Only the different parts will be described. The
pressure ring 23 is inserted into the circumferential groove 21 and the O-ring 22 is compressed
and fixed by utilizing the elasticity of the claw 24.24. It will be obtained. As described above, the
ultrasonic transducer relating to the non-invention [In the above, the ultrasonic transducer is
positioned by the fitting of the inner and outer circumferences of the elastic material ring and the
sleeve, so that the mounting operation can be easily performed. At the same time, it is possible to
improve the quality of the position accuracy completely eliminated. It is possible to intervene by
interposing a sleeve between the enlarged diameter portion of the housing horn and the elastic
material ring, and individually select the material of the horn and the filling resin based on the
contradictory conditions of chemical resistance and adhesion. Therefore, the waterproofness
between the sleeve and the elastic material ring can be completely considered. In addition, since
the gap between the enlarged bore and the sleeve is sealed to the O-ring, as a result, it is possible
to provide a versatile ultrasonic transducer which is rich in chemical resistance and water
resistance.
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