DESCRIPTION JPS5743700

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DESCRIPTION JPS5743700
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view of a conventional
ultrasonic handset, and FIGS. 1 · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·
· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · reflector plate.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an ultrasonic
wave transmitter / receiver fM that transmits and receives ultrasonic waves, and more
particularly to a supersonic transducer suitable for being placed at a location exposed to a selfcontained water tank. The ultrasonic transducer 1, the horn 2 and the waveguide 3 connecting
these as shown in 2.11. − And the horn 2 are coaxially ν. Therefore, if this ultrasonic
transducer is installed horizontally outside the body at the rear of the car, for example, as a rear
obstacle detection means of the car, the mountain water and car wash water which invaded from
the horn 2 directly to the ultrasonic lifter 1 The water droplets attached to the moving element 1
are difficult to fall off due to overtones and sound waves, and as a result, the transmission and
reception sensitivity is not reduced, and the lifetime of the ultrasonic transducer 1 is shortened
due to corrosion. there were. The purpose of the present invention is to solve this problem, and
when the horn is installed horizontally, the ultrasonic transducer is disposed at one point
position relative to the horn, and the horn, the ultrasonic wave & the scissors, The above object is
achieved by attaching a reflecting plate at the intersection of the central axes of the elements and
forming a part of the equal wave tube by this reflecting plate. Hereinafter, the present invention
will be described based on the illustrated embodiments. As in the embodiment of the car 1 shown
in 2M, 1 is an ultra-r wave & wave “1” that transmits and receives ultrasonic waves, 2 is a
horn having a predetermined directivity of 2 and 3 is an ultrasonic wave transmission unit.
Waveguide. The waveguide 3 is connected at its one end by the other end which holds the
ultrasonic transducer 1 (7 rung 21 shop bolt 4 formed at one end of the 1 horn 2-6). The shape
of the soul t-director 3 is a cross section shadow, the ultrasonic transducer 1 is coaxial with the
next r forceps 1, the horn 2 side is identical to the horn 2, and the central portion is
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perpendicular Cross and communicate. An opening is formed in one of the intersections, and the
reflecting plate 6 is fixed to the opening by a screw 7 to form a part of the waveguide 3 in an l'il.
The intersection point where the central axis of the ultrasonic transducer l and the central axis of
the horn 2 are orthogonal to each other is located at 1 m above the Si 6 emitting plate, and forms
an angle (9) of 45 ° It is arranged in Also, the bottom of the waveguide 3 is provided with a
drain hole 8. In addition, as the reflecting plate 6, a metal having a good reflection property of tp
and% acoustic wave is used. In the ultrasonic transducer configured as shown in E, ultrasonic
waves are generated from the ultrasonic transducer 1 by excitation of an electric signal of a
predetermined frequency, travel along the cavity of the waveguide 3 and reach the reflector 6 .
Then, the Gyeongju sound wave reflected by the reflection plate 6 is transmitted from the cavity
of the waveguide 3 parallel to the central axis of the horn 2 and transmitted to a predetermined
space.
When an ultrasonic signal is received from a predetermined space, the reverse of the fresh path
is cooled and converted to V heat by the ultrasonic f photon 1. By the way, the above ultrasonic
transducer is used as a vehicle rear obstacle detecting means-, with the horn 2 facing rearward
and horizontally facing west, the ultrasonic transducer is mounted on the rear portion r of the
vehicle body. In this case, even if rainwater or water at the time of car washing intrudes from the
opening of the horn 2, the water is hardly directly applied to the ultrasonic transducer 1 because
it is higher than the horn 2. Also, since the ultrasonic transducer 1 is installed straight and its
surface is directed downward φ, the water drops easily even if water drops adhere, and the
water invading the horn 2 and the waveguide 3 Is expelled from the drain hole 8 to the chest.
Next, the second practical example shown in the rate 3 陳 1 is the first embodiment in that the
continuous wave vibration / motion element 1 and the horn 2 are disposed at positions where
their central axes intersect the depression angle ・Different from the example. The reflecting
plate 6 is provided at an intersection position of the two core axes and in an inclination direction
equalizing the angles with these central axes, and the other materials are 51 real qq and real
ballistic like The same and sink the same action needle. The third practical example company
shown in FIG. 4, a reflection r-noro is lost on a paraboloid, and a super power wave is a second
example at a point where the child 1 is positioned at the focal point of the paraboloid. Unlike the
coffin, the coffin's platform is the same as in the second embodiment, and achieves the same
effect. According to the present invention, not shown in the above embodiment, the present
invention arranges the ultrasonic wave Umeha I and the horn so that their central axes cross at a
predetermined angle in the pipe, and Since the book provides an ultrasonic transducer having a
reflection plate disposed at the intersection, the ultrasonic wave transmission and reception of
the present confectionery '? In the N unit, even if water such as rainwater infiltrates from the
horn, the water does not overlie the ultrasonic wave and prevents the deterioration of the
transmission and reception sensitivity m = b--. And the life of the ultrasonic transducer can be
kept long.
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