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BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
ultrasonic horn such as a washing machine for detecting the amount of cloth by ultrasonic
waves. PRIOR ART Conventional ultrasonic horns of this type are shaped as shown in FIG. That is,
the ultrasonic element 2 can be placed at one end of the conical cylinder (referred to as a conical
horn) 1 to prevent a drop in the sound pressure of the ultrasonic wave and allow the ultrasonic
wave to be emitted in one direction. Problems to be solved by the invention However, with such a
shape, when it is incorporated in a limited space, for example, a pig in the upper part of a
washing machine, the size is limited, and only a small horn can be used. The sound output
performance is degraded. Means for solving the problems and technical means of the present
invention for solving the above problems are the conventional conical tube horns (conical horns
are cut at a plane inclined with respect to their central axis, and these cut surfaces The parts
separated at symmetrical positions are placed in such a way that the cut surfaces join with each
other to form a bent conical cylinder that is penetrated, and a reflecting plate is provided on the
cut surfaces. Operation The action of this technical means is as follows. That is, since the emitted
ultrasonic waves are reflected by the reflection plate and the subsequent path travels in the bent
horn cylinder without hitting any inner wall, the same effect as a straight horn is obtained, and
the output sound pressure is obtained. Not to lower An embodiment of the present invention will
be described below with reference to the attached drawings. FIG. 1 shows a ho 71 showing an
embodiment of the invention, which is a straight conical horn 1a (indicated by a two-dot chain
line in the figure) cut at a surface B having a bevel with respect to a center AK and a line AK. The
section BK which is symmetrical to the section BK is symmetrical to the section 4. This section
has a shape of penetrating each other. The reflective plate 3 is bonded to the cut surface. An
ultrasonic element 2 is attached to the horn 1 via an elastic body 4. Now, although the ultrasonic
wave emitted from the ultrasonic element 2 is reflected by the reflecting plate 3 and proceeds in
the direction as shown in the figure, the ultrasonic wave 5 or 1j 6 traveling along the inner wall
of the horn 1! (I) Since the inflected part molecules are in a straight state and at symmetrical
positions with respect to the reflecting plate 3, they are emitted without hitting the inner wall of
the bending ho 77 even after reflection. FIG. 2 shows the horn incorporated in a washer. In the
figure, 8 is the upper pig of the washing machine in which the ultrasonic horn 1 is installed, and
the emitted ultrasonic waves are used to measure the distance to the cloth or water surface in the
washing tub 9, Detect water level and amount of clothes. Based on the results, determine the
amount of water suitable for cloth loading and the time for washing, sipping and dehydration.
In addition, it explained with the conical horn in the execution line, but it is exbonen / kuru. The
same is true for parabola horns. Effects of the Invention As described above, the ultrasonic horn
of the present invention can be built in a small space, and the same effect as a straight horn can
be obtained. Moreover, since it is bent, even if there are splashes of water droplets, it does not
adhere to the ultrasonic element itself, and the reliability is also high.
Brief description of the drawings
FIG. 1 is a cross-sectional view of an ultrasonic horn showing one embodiment of the present
invention, FIG. 2 is a block diagram showing a state incorporated in the washing machine, and
FIG. 3 is a cross-sectional view of the horn showing a conventional example. .
1 o · · · · washing machine body, 11 · · · · · · · · · · · · · · · · · water, 13 · · · · pulsator. Figure 1 Figure 2
Figure 3
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