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BRIEF DESCRIPTION OF THE DRAWINGS The drawing is a partially cutaway side view taken
along the central axis of the transducer, with 1 being a short hair group and 2 being an
ultrasonic radiation receiving wavefront of the transducer. −69−
DETAILED DESCRIPTION OF THE INVENTION The present invention emits an ultrasonic wave
into water and measures the time until the sound wave is reflected by the object and returns to
the back, and determines the distance to the reflecting object by using an ultrasonic depth meter.
The structure of an ultrasonic wave radiation receiver (transducer) will now be described with
reference to the drawings. It is characterized in that the entire surface is flocked in a direction
perpendicular to the It is extremely important for the transducer to emit or receive ultrasonic
waves into water that its radiation receiving surface is wetted with water (1 ° from the
viewpoint of sensitivity. Conventionally, paints and the like having high hydrophilicity have been
used for this purpose, but when human sebum or the like is applied, its effect disappears, and it
has been difficult to maintain sufficient hydrophilicity. The structure according to the present
invention is, for example, a highly hydrophilic Tetron fiber, which is flocked to the radiation
receiving surface of the transducer, so that the property of getting wet with water increases, and
the performance can be stably maintained for a long time. The method of flocking may be used
as it is, for example, electrostatic flocking which has been established in the past, and in this way,
"water wetting" which has conventionally been regarded as a major problem in the performance
of transducers. The problem was solved inexpensively.