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-No change in the content of the document 11) Description 1
Ultrasonic transducer
3. Detailed Description of the Invention Conventionally, ultrasonic transducers used in water, etc.
transmit and receive waves only in a certain direction, and the dimensions and shape of the
transducers are on the outer periphery of the ultrasonic transducer except the transmission and
reception wavefronts. The method of sticking the sponge board of closed cells, such as rubber |
gum and plastics which were cut according to the etc., is used. However, this is very timeconsuming and efficient. In addition to this, a method has also been proposed in which a liquid or
viscous curable foamable plastic containing a foaming agent is injected into a mold or a frame
provided on the outside of the ultrasonic transducer. Although this is more efficient than the
above-mentioned ones for cutting and bonding the sponge plates and there is no need to apply
external pressure, it is advantageous, but open cells are generated in the foaming process and
there is a risk of water immersion. Therefore, the thickness of the foam becomes a dog, and there
is a drawback to the reduction in size and weight of this type of device. The present invention
solves the above-mentioned drawbacks. The surface of the foamed plastic layer provided on the
outer periphery of the ultrasonic transducer is brushed or dip-coated with PVC plastisol, and this
is heat-melted (gelled) to make the plastic A protective layer is formed, and these double
structures improve water tightness and mechanical performance. This will be described below
with reference to the drawings. The figure is a cross-sectional view of the present invention,
wherein 1 is an ultrasonic vibration element, 2 is a winding, 3 is a winding end, 4 is an ultrasonic
radiation plate, 5 is a foamed plastic layer, and 6 is a plastic protective layer. . The foamed
plastics layer 5 is preferably made of polyurethane, polystyrene L / N, PVC, rubber, ethylene
vinyl acetate copolymer and the like having good workability, and in particular, for example, a
polyol to be casted into a mold or a frame. A mold or frame provided at a position surrounding 1
by stirring and mixing the first solution for urethane foam having the main agent EndPage 1 and
the second solution containing the polyisocyanate as the main agent in the same container. Apply
the agent to form a foamed plastic layer of polyurethane foam. Next, the plastisol to be applied to
the surface of the foamed plastic layer 5 is 100 parts of a PVC paste range (for example, Geon
121 or 135 J), a plasticizer (for example, DOP). DOA etc. 50-150 parts, stabilizers (e.g. tribase).
The amount of the plasticizer is determined from the viscosity of plastisol and the mechanical
properties of PVC after heat gelation, ie, the tensile strength, elongation and the like. This
plastisol is applied to the surface of the foamed plastic layer as described above, but in this case
it may be by dip coating in which the transducer is turned upside down and dipped in a plastisol
immersion tank, in which case the plastisol used is The workability is further improved if the
non-droplet-type formulation is performed.
Thus, the layer of plastisol which has been dipped or brushed is heated and PvC resin (the
plasticizer absorbs and dissolves (gels), and the plastisol which was a fluid is soft and
homogeneous plasticized. It becomes a plastic protective layer 6 made of PVC. For this heating, a
suitable one such as hot air, infrared lamp, heating, or a furnace may be used, but if the heating
temperature is low, the mechanical properties are poor, so sufficient heating at an appropriate
temperature (150 to 200 ° C.) is necessary. is there. In this case, since the vibrating element 1
and the winding 2 are surrounded by the foamed plastic layer 5 and this acts as a heat insulating
material, there is no concern about the thermal deterioration of these. The thickness of the
plastic layer formed by dip coating or the like may be sufficient to satisfy airtightness and
mechanical performance, for example, from 05 to 1 mm, and when it becomes thicker, the
heating temperature and time become longer, the workability decreases and the inside There is
also a danger that the surface may be heated and cause thermal decomposition before the
gelation of is complete. In the present invention, as described above, the plastisol is applied to the
surface of the foamed plastic layer, which is gelled to prevent water immersion and mechanical
protection, and the cells of the foamed plastic layer are also not limited to closed cells. There is
also an effect that when the change in foaming is increased and the reflection efficiency is
improved more than in the prior art, it becomes possible to carry out nostalgia. , 4 [a simple
explanation of the surface, and 1 is a sectional view of this layer. 1 · · vibration element, 2 · · ·
winding, 3 · · winding end, 4 · · ultrasonic radiation root, 5 · · foamed plastic layer, 6 · · · plastic
protective layer. Patent application applicant's clean book (no change to the contents) EndPage: 2
Procedure Amendment (Spontaneous) No. 2 No. 2 1959, Secretary General of the Patent Office
Nobuo Kawahara 1, display of the case Japanese Patent Application No. 54-153641 2, Title 2 of
the invention, title of the invention Ultrasonic transducer 3 Related to the case of correction
Patent applicant vl 41 Tokyo parts for Tokyo ward Kamiosaki 2-10-455 Content of correction 明
細 Specification and description of drawings (No change to the content) EndPage: 3
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