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JPS5925498

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DESCRIPTION JPS5925498
[0001]
The present invention relates to an ultrasonic transducer that detects an obstacle in proximity to
a vehicle by mounting it on a vehicle and transmitting and receiving ultrasonic waves, or
performs communication between vehicles. The ultrasonic transducer comprises an ultrasonic
transducer for receiving and transmitting ultrasonic waves, and a foul plate for giving directivity
to the transmitted ultrasonic waves and collecting the received ultrasonic waves. The transducer
on this shelf is usually mounted on the front bumper or bumper of a vehicle with the reflector
directed in the direction of travel of the vehicle, and snow or dirt carried with the wind adheres
to the reflector where the wind stagnates, Its function is significantly reduced. The present
invention is intended to solve the above-mentioned problems by providing a through hole
through which wind flows in a reflection plate of an ultrasonic transducer. The invention will
now be described by way of the illustrated example. FIG. 1 is a view showing a state in which an
ultrasonic transducer 1 of the present invention is mounted on a front bumper A of a vehicle, and
FIG. 2 is a view showing a state mounted on a lower portion of a weber bumper B. FIGS. 3 to 5
show a first embodiment of the present invention. The housing 11 of the transducer 1 is made of
resin or metal, and has side walls 11b at both ends, and a front end is a gate-shaped end face.
Make 11a. The center of the large part of the end face 11a is cut out, and the rubber housing 3 is
fitted in the cut out part. The ultrasonic transducer 2 is accommodated at the front of the rubber
housing 3 with the electric signal directed backward, and a lead wire laid in the communication
hole of the rubber housing 3 and the housing 11 of the transmitter / receiver 1 It is taken out of
the transmitter-receiver 1 through the connector 4 provided on the rear end face of the housing
11 by 2a. The side wall 111) of the housing 11 is inclined inward, and its wall thickness is
increased rearward. Between the rear end portions of the side walls 11'b, there is provided a
reflecting plate 5 extending in the longitudinal direction and having slits 5b parallel to each other
at predetermined intervals. More specifically, in the present embodiment, the reflecting plate 5 is
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a round bar in which a plurality of elongated plates 51 having a predetermined width 11 are
arranged in parallel at a predetermined interval (slit width) lx and these are stretched between
the both side walls 11b. It is configured to be connected by 6. The slit width 12 is regulated by a
collar 52 mounted on a round bar carrier. The reflector 5 is made of the same synthetic resin or
metal as the housing 11. The front surface of the reflecting plate 5, that is, the reflecting surface
5a, forms a concave paraboloid, and the vibrator 2 is oriented in the paraboloid direction at the
focal point of the paraboloid. When an electric signal is applied to the transducer 2 of the
ultrasonic transducer 1 of the above structure through the connector 4 by the line 2a, an
ultrasonic wave is emitted by the transducer 2 and this ultrasonic wave is The light is reflected
by the reflection plate 50 and the reflection surface 5a, and is transmitted in the horizontal
direction as shown by the arrow in FIG.
Further, the ultrasonic wave incident in the horizontal direction is reflected and collected by the
reflection surface 5 a of the reflection plate 5, reaches the vibrator 2, is converted into an electric
signal, and is taken outside the transducer 1 by the lead wire 2 a through the connector 4. Will
be issued. Therefore, in the present embodiment, since the reflecting plate 5 is configured as
described above, even when a wind of snow or mud is blown toward the reflecting plate 5 when
moving forward or backward, or in the case of strong wind, etc. The wind flows through the slit
5b formed on the reflection plate 5. Therefore, most of the snow and mud pass through the slit
5b with the wind, the adhesion to the reflecting surface 5a is significantly reduced, and the
functional deterioration of the reflecting plate 5 can be prevented. Mostly fine snow and rain
circulate with the wind. The slit width l! Of the ultrasonic transducer 1 having the structure of
the above embodiment in FIG. And an example of experiment about the relationship between the
distance between the slits (plate width) 11 and the reflection ability (gain reduction amount) is
shown. Also in the case of the line 1 when the interval 11 between the Surin 1 is 5 and the line t2
is between 1; The parabola shape of the reflecting surface 5a of the reflecting plate 5 is y = ljijj O
("). As is known from the figure, when the slit spacing It is 5 mm (line 1. ) Slit width l! The wider
the range is, the lower the reflection ability is, but the decrease is gradual. Slit width if allowance
for gain reduction is 2αB! 2 can be broadened with 1.2 fLm i. On the other hand, when the slit
spacing 11 is 11 (line 1 *), the gain reduction amount is extremely large when the slit width 12 is
increased. On the other hand, if the slit width t2 is too small, snow and mud can not pass
through, and it is recognized that the slit width 12 needs at least Q, 51 ML or more. Therefore, if
the spacing A + is 1 mm and the nurit width 12 is 05 悶 or more, the reflection efficiency is low
and it is not practical. In order to keep the amount of gain reduction below 2 dB and to cause
little snow and mud adhesion, scan IJ z) lfi / z Ha 0.5 to 1.5 mm, 7! It is desirable to set the
interval 34% to 34 mm, and it is desirable to widen the slit width 12 within the above-mentioned
Ill + 'i range, and to increase the inter-slit interval 11 accordingly. If the inter-slit spacing 1+
exceeds six, the adhesion of snow and mud tends to increase even if the slit width 12 is
increased. As described above, according to the ultrasonic transducer of the present invention, by
forming a large number of slits in the reflective plate without impairing its function, the wind is
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made to flow and the stagnation of the wind in the reflective plate is prevented. Thus, it is
possible to prevent the adhesion of snow etc. to the reflection plate.
FIG. 7 shows a second embodiment of the present invention, in which a large number of small
circular holes 50 are provided in the reflecting plate 5 at a predetermined interval 13. In order to
maintain the amount of gain reduction to the extent in the first embodiment and to hardly cause
adhesion of snow or mud, the diameter of the small holes is 3 to 6 and the distance between the
small holes is 10 to 15 It is desirable to fight. FIGS. 8 and 9 show a third embodiment of the
present invention, in which a hole is formed in the area of the reflector where the reflected wave
is not received by the vibrator. That is, in FIG. 9, only the ultrasonic wave incident horizontally
from the right side of the drawing reaches the vibrator 2, but in the reflection plate 5, the abovementioned ultrasonic wave is blocked by the rubber housing 3 and does not reach the area. A
hole 5d is provided. As a result, the wind blown to the reflection plate 5 rises along the reflection
surface 5a and is promptly circulated backward at the hole 5d, so that snow and mud flying on
the wind adhere to the reflection surface 5a. There is nothing to do. Since the present
embodiment is still provided with the perforations in the area not contributing as a reflector,
there is no decline in the sound collecting ability. In addition, it is desirable that the size of the
through hole be formed large within the range of the above-mentioned region in view of the
snow mud adhesion preventing effect. As described above, the ultrasonic transducer according to
the present invention allows the snow and mud mixed winds to pass through the reflection plate
without stagnating the snow and mud adhesion by providing a hole in the foul plate. , It is
possible to use under adverse conditions.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a view showing a state in which the ultrasonic transducer according to the present
invention is attached to a front bumper of a vehicle, FIG. 2 is a view showing a state in which the
ultrasonic transducer is attached to a lower portion of a bumper, and FIGS. 3 shows an overall
front view, FIG. 4 is a cross-sectional view taken along the line IV-IV in FIG. 3, FIG. 5 is a crosssectional view taken along the line II--in FIG. 3, FIG. FIG. 7 is a diagram showing the relationship
between the slit width and the slit interval and the amount of gain reduction, FIG. 7 is a whole
front view showing the second embodiment of the present invention, and FIGS. 8 is an overall
front view, and FIG. 9 is a cross-sectional view taken along the line IX-IX in FIG.
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1: Ultrasonic transducer 2. Transducer 5. Reflector 5b: Slit (hole) 5C: Small hole (hole)-5 '. Figure
1 Figure 2 Figure 3 Figure 42 Figure 5 Figure 6 Figure 7 Figure 8 Figure 53-Figure 9
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