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JPS5939197

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DESCRIPTION JPS5939197
[0001]
According to the present invention, for example, by performing transmission and reception of C
ultrasonic waves mounted on a vehicle, a nearby obstacle is detected, or communication between
vehicles is reversed to an ultrasonic wave transmitter / receiver. Conventionally, as an apparatus
of this type, an ultrasonic transducer and a horn are mounted in a bumper at the rear of a heavy
vehicle so as to transmit and receive ultrasonic waves to the rear of the vehicle. This device
requires a horn to obtain directivity in a predetermined direction, which requires a certain
amount of depth. On the other hand, a reflection type ultrasonic transducer with a reduced depth
can be considered. This reflection-type ultrasonic transducer comprises an ultrasonic transducer
that transmits and receives ultrasonic waves, and a reflector that provides directivity to the
transmitted ultrasonic waves and that collects the received ultrasonic waves. . This is
advantageous over the conventional ultrasonic transducer described above in that the side lobes
are small and the aperture area for transmitting and receiving ultrasonic waves can be made
wide. However, when a car wash is performed on such an ultrasonic transducer using a hose or
the like, water rises upward along the reflection plate, causing a large amount of water to hit the
ultrasonic transducer. There is a problem that the function of the ultrasonic transducer is
deteriorated. According to the present invention, the reflection type ultrasonic transducer
described above is provided with a pair i, -r-no-which holds supersonic 1 vibration / -4 fixed at a
predetermined position with respect to the reflection plate, above the reflection plate. By forming
a gap between the arm and the reflection plate to discharge the water flowing into the reflection
plate to one part from above, the above problem is solved. The present invention will be
described below with reference to an embodiment shown in the drawings. FIG. 1 is a crosssectional view when the ultrasonic transducer according to the present invention is mounted in a
bumper at the rear of the vehicle. In FIG. 1, 1 is a parabolic reflector as a reflector for giving a
specific directivity to the transmission and reception of ultrasonic waves, 2 is an opening of the
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bumper 6 at the rear of the vehicle and the parabolic reflection An ultrasonic kite connecting the
end of the opening surface of the mirror 1 with a tapered cylinder, 3 emits ultrasonic waves to
the parabolic reflector 1 and receives ultrasonic waves reflected by the parabolic reflector (solid
line The ultrasonic transducer 3) is a mesh provided on the front surface of the ultrasonic
transducer 3), 4 holds the ultrasonic transducer 3 at the focal position with respect to the
paraboloid of the parabolic reflector 1, and the parabolic reflector 1-A rubber earp 1.5 provided
with a collar-like projection 4a with a collar-like protrusion 4a fixes the parabolic reflection 11 ■
and the arm 3 and a bracket for mounting them inside the bumper 6, 6 is made of urethane Or
metal bumpers 7a and 7b are the left and right ends of the parabolic reflector l and the F
direction And a parabolic gap section provided while maintaining a constant distance between
the ultrasonic guide 2.
FIG. 2 is a view as seen from the arrow 1f1 of FIG. 1f, in a portion surrounded by the upper
curved surface portion 1a of the parabolic reflector 1, the central curved surface portion 4t + of
the arm 4 and the arms of the arm 3 divided into two branches; A curved air gap 8 is formed. The
lead wire of the ultrasonic transducer 3 passes through one of the two arms of the arm 3 (not
shown) and is connected to an external device C. FIG. 3 is a cross-sectional view taken along the
line II--II of FIG. When an electric signal is given to the ultrasonic transducer 3 of the ultrasonic
transducer having the above-described structure, an ultrasonic wave? Ultrasonic waves are
emitted by the JJ and JH motions 3, and the ultrasonic waves are reflected by the parabolic
reflector 1 and transmitted to the rear of the vehicle as shown by the arrows in FIG. In addition,
the ultrasonic wave reflected by the obstacle behind the vehicle is parabolic reflection from the
ultrasonic guide 2! It is reflected and collected at 1 i, reaches the ultrasonic transducer 3,
converted into an electric signal, and transmitted to an external device. Thus, in the present
embodiment, the bumper of the ultrasonic guide 2 in FIG. 1 is opened when the vehicle is
discharged and washed using a hose or the like! Water flowing in from part 1 travels along the
surface of the parabolic reflector 1 from the direction toward the dotted line not shown in FIG. 1
and is discharged in the direction of the dotted line B through the gap 8 formed above it. .
Further, the water which has not been discharged in the direction of the dotted line B but which
has turned around in the direction of the dotted line C turns around on the collar-like projection
4 a provided at the tip of the arm 4 and drops. Also, 1) other than the above B and C directions,
E. Water in the F direction, left and right direction in the zebra paraboloid reflection 1 t l, [water
in the direction is due to parabolic gaps 7a and 7b provided at both ends of the parabolic
reflector 1 and in the F direction] Discharged into Therefore, the water which has flowed in from
the opening of the ultrasonic kite 2 is discharged to the outside from each void portion, so that
the water can be prevented from flowing into the ultrasonic transducer 3. The same effect can
also be obtained by mounting the ultrasonic transducer described in the first embodiment in the
second embodiment without using an ultrasonic guide outside the vehicle such as the two-part
bumper or the lower part. Next, a second embodiment of the present invention will be described
with reference to FIG. 4 and FIG. In FIG. 4 and FIG. 5, the ultrasonic transducer 3 is placed on the
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parabolic reflection 111 at a predetermined focal point II! By the arm 9 composed of two wedges
and a plate. It is held by fill. By adopting such a structure, it is possible to form a void larger than
the void shown in the first embodiment. Furthermore, a third embodiment of the present
invention will be described with reference to FIG. As shown in FIG. 6, the ultrasonic transducer 3
is fixed to the inside of the vehicle rear bumper 6 with a predetermined focal distance with
respect to the parabolic reflector 1 by the bracket 10.
With such a structure, it is possible to form a void larger than the void shown in the g141
embodiment. According to the present invention J, as described above, the reflection type
ultrasonic transducer is provided with the end for fixing and holding the ultrasonic transducer at
a predetermined position with respect to the reflection plate on one side of the reflection plate.
Since an air gap is provided between the 1-m and the reflection plate, the water rising upward
along the reflection plate is discharged to prevent the ultrasonic vibration r from being hit by 1k,
thereby the ultrasonic vibration r It has the excellent effect of being able to prevent the
functional decline of the
[0002]
Brief description of the drawings
[0003]
1 is a cross-sectional view showing a first embodiment of the present invention, FIG. 2 is a view
taken in the direction of arrow 11 in FIG. 1, FIG. 3 is a cross-sectional view taken in the direction
of arrows III-111 in FIG. FIG. 5 is a front view showing a second embodiment of the present
invention, FIG. 6 is a cross-sectional view showing a third embodiment of the present invention.
1 ... parabolic reflector ~ 3 ... ultrasonic transducer, 4 ... arm, 6 ... bumper. Agent Patent Attorney
Okabe Takashi 1 Figure 31, 31 Figure 2 Figure 4 @ 5 Figure 6
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