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BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
ultrasonic measuring device such as an ultrasonic obstacle detecting device, a vehicle height
sensor, a liquid level meter and the like for measuring the distance and height of an object by
transmitting and receiving ultrasonic waves. It can be widely used when the ultrasonic
transducer is installed in a place where there is a risk that solid or liquid foreign matter such as
relatively small dust, mud water or the like may intrude or attach to the inside. Configuration of
the prior art and its problems Conventionally, when installing the ultrasonic transducer in a place
where there is a possibility that foreign matter such as solid or liquid may infiltrate or attach, a
ring or mesh netting or the like may be attached to the horn opening. Fixed to prevent the entry
of foreign matter into the horn. However, this method can not be cleaned with water or solvent to
prevent damage to the microphone even if tar, oil, mud, etc. get stuck in the opening or horn, so
it not only impairs the appearance but also degrades the characteristics. It could not be
recovered even if it was caused, and deterioration due to rust often occurred. Also, if the mesh is
broken due to a collision of a foreign object, etc., the mesh can not be replaced because it is fixed
to the horn, and even if there is no abnormality in the microphone and horn, it can not be used
Was required. On the contrary, when a failure occurs in the microphone, the whole including the
horn protection network can not be reused. SUMMARY OF THE INVENTION The present
invention has been made to solve the above-mentioned drawbacks, and it is possible to simplify
the removal of dirt inside the horn and the protective netting, and further to make the parts
compatible with each other, thereby making it possible to use the entire transducer. The purpose
is to extend the cost and reduce the product cost. SUMMARY OF THE INVENTION In order to
achieve the above object, an ultrasonic transducer according to the present invention has a
protective net removably attached to an opening of a horn housing an ultrasonic microphone. In
the protective net portion, a portion covering the horn opening is a slit, a mesh or the like which
does not disturb the characteristics of the microbon and does not disturb the directivity of the
horn. As a result, the dirt inside the horn can be easily removed, and since the horn portion and
the protective net can be separated, it is possible to remove only the side that needs replacement
when replacing parts. Description of the Embodiments One embodiment of the present invention
will be described below with reference to the drawings. FIG. 1 is a partially broken side view of
this embodiment. In FIG. 1, reference numeral 1 denotes an ultrasonic microphone, which is
given directivity by a horn 2. Reference numeral 3 denotes a protective net portion, and a portion
covering the horn opening has a gap having a shape which does not disturb various
characteristics of the microphone 1 such as a slit or a net and does not disturb the directivity of
the horn 2.
In addition, a screw mountain having sufficient strength for attaching the protection net 3 to the
outside of the open end of the horn 2 is provided, and a corresponding screw thread is provided
inside the peripheral edge of the protection net 3 It is provided. In addition to the screw
structure, the horn 2 and the protection net portion 3 may be integrated by / from the groove
and the claw portion engaged with the groove. Thus, by making the horn and the protection net
part detachable, the horn part and the protection net part can be separated, and even if solid or
liquid intrudes or adheres into the horn, it can be easily removed. In addition, when it is
necessary to replace parts due to damage to the protection network due to a collision of a foreign
object or a malfunction of the microphone, only the part that is desired to be replaced can be
removed. Waste can be saved. In this case, if the horn and the protective net are made of the
same material by resin molding or the like, the number of manufacturing steps of parts can be
significantly reduced, and the cost can be reduced and parts are always supplied with stable
dimensions. Also very good compatibility. Further, since the same material is used, attachment
and detachment due to wear and tear reduces the wear of the part, so that the usable period of
the entire transducer can be extended and the product performance is also improved. For
example, if the protective mesh portion is made of resin, the rust which tends to be a problem in
the wire mesh is also solved. Furthermore, as the shape of the part covering the horn opening of
the protective net which can not prevent the characteristics of the microphone, as shown in the
front view of FIG. 2 a and the cross sectional view of FIG. One example is one having a large
number of parallel flat plates with a cut surface of. The surface of each flat plate is flat enough to
reflect ultrasonic waves, and as shown in the figure, the ultrasonic waves are first reflected by
the A surface and then rereflected by the 8 surfaces and emitted from the horn to the outside
and forward Ru. Each surface is flat enough to reflect ultrasonic waves, so it has little effect on
the sound pressure of the ultrasonic waves and the characteristics of the microphone, but the
size of the foreign matter that is expected for foreign matter coming from the outside matches
the expected size By selecting the cut angle and the slit "1", it is possible to prevent its
penetration into the horn by almost 100%. Effects of the Invention As described above, the
ultrasonic transducer according to the present invention has the protective net removably
attached to the horn opening containing the ultrasonic microphone, so the contamination inside
the horn is extremely easy. Not only can they be removed, they can be easily repaired, and their
time to worry can be reduced.
Brief description of the drawings
FIG. 1 is a partially cutaway side view of an embodiment of the ultrasonic transducer according
to the present invention, FIG. 2 a is a front view showing an example of a protective mesh in the
present invention, and FIG. .
1 иииииии Ultrasonic microphone, 2 ииии Horn и 3
ииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииии Ultrasonic microphone, 2 и и и и и и и и и и и и и
и и и и и и и и и и protection net portion. Name of Agent Attorney Nakao Toshio Other 1 person Figure
1 Figure 2 ? b
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