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JPS63181597

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DESCRIPTION JPS63181597
[0001]
TECHNICAL FIELD The present invention relates to an ultrasonic horn for detecting snow.
(Background Art) FIG. 17 shows the appearance of a conventional ultrasonic horn 1 ', wherein (a)
is a front view, (b) is a plan view, and (c) is a bottom view. It is common for the housing to have a
conical shape. By the way, there are an automatic door and a snow detection device etc. as an
applied product of the ultrasonic wave, but in the latter snow detection device especially, since
the ultrasonic horn is attached outdoors, it is prevented from becoming inoperable by the
adhesion of snow. There is a need. That is, FIG. 18 shows a schematic configuration for detecting
snow, in which 2 'is a horn housing, 3' is a horn, and 4 'is a microphone (vibrator). The ultrasonic
wave is transmitted, the reflected and returned ultrasonic wave is received, and the height of the
snow S accumulated on the roof R is measured by measuring the time from the transmission to
the reception. Therefore, the ultrasonic horn 1 'must be located above the roof R, and snow
adhesion is remarkable. FIG. 19 shows how snow S adheres to the ultrasonic horn 1 '. First, as
shown in (A), snow S begins to be accumulated above the horn housing 2', (B). As shown in (C),
snow S gradually descends downward (snow is caused by the slip of snow S on the smooth outer
shell) and finally the opening of M acoustic horn 1 'is completely completed. Blocking makes
snow detection impossible. SUMMARY OF THE INVENTION The present invention has been
proposed in view of the above points, and an object of the present invention is to provide an
ultrasonic horn which can be prevented from becoming inoperable due to the adhesion of snow.
is there. The present invention will be described in detail below with reference to the drawings
showing the embodiments. FIG. 1 shows a first embodiment of the ultrasonic horn 1 according to
the present invention, in which a plurality of projections 5 as projections are provided in parallel
to the horn housing opening surface P on the outer shell of the conical horn housing 2. Each is
provided. Although not shown, a microphone for transmitting and receiving ultrasonic waves and
a horn for giving directivity to ultrasonic waves are provided in the horn housing 2. FIG. 2 shows
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a second embodiment which is a modification of the first embodiment, in which the projections 5
formed on the outer shell of the horn housing 2 are inclined with respect to the horn housing
opening surface P. Are different. FIG. 3 shows a third embodiment in which the second
embodiment is further modified, in which the horn housing 2 is provided with the projections 5
in a spiral shape.
FIGS. 4 to 6 show the fourth to sixth embodiments, wherein the groove 6 as a recess is used in
the outer shell of the horn housing 2 in place of the protrusion 5 in the first to third
embodiments. It is formed. FIG. 7 shows a seventh embodiment, in which a plurality of
projections 5 are randomly distributed on the outer shell of the horn housing 2 and, for example,
+15 to +20 are formed in the opening of the ultrasonic horn 1. Attach lid 7 using shape memory
alloy whose shape changes in ° C with screw 8 and automatically close fi7 when it is not
necessary to detect snowfall except during winter season and insects etc. get into horn housing 2
It is designed to prevent nesting and add functions to prevent it from becoming unusable in
winter. Therefore, the figure (a) shows the condition in spring, summer and autumn, and (b)
shows the condition in winter; (a) shows the front view, and (b) shows the same. The bottom view
is shown, but since it is about -30 to + 10 ° C when it snows in winter, the lid 7 made of shape
memory alloy jumps up as in (b) at this time and it interferes with snow detection. In the other
period, the lid 7 is closed as shown in (A). In addition, this structure is applicable not only to this
embodiment but also to other embodiments. FIG. 8 shows an eighth embodiment, in which a
plurality of recesses (portions 9 are randomly distributed and formed on the outer shell of the
horn housing 2 and the opening of the ultrasonic horn 1). A plurality of lid pieces 10 using a
shape memory alloy are attached by screws 11. Therefore, the figure (a) shows the condition in
spring, summer and autumn, and (b) shows the condition in winter, respectively (a) is a front
view and (b) is a bottom view In the winter season, the cover piece 10 made of shape memory
alloy is flipped up as shown in (b) and there is no hindrance to snow detection, and in the other
time, the cover piece as in (b) 10 will be closed. In addition, this structure is applicable not only
to this embodiment but also to other embodiments. FIG. 9 shows a ninth embodiment, in which a
plurality of projections 5 are formed on the outer shell of the horn housing 2 so as to be linearly
distributed toward the opening of the ultrasonic horn 1, The arrangement is arranged parallel to
the horn housing opening surface P. FIG. 10 shows a tenth embodiment which is a modification
of the ninth embodiment, and is different in that the horizontal arrangement of the projections 5
is disposed obliquely to the opening surface P of the horn housing. 11 and 12 show the 11th and
12th embodiments, in which the recess 9 is formed on the outer shell of the horn housing 2
instead of the projection 5 in the 9th and 10th embodiments. It is.
Thus, FIG. 13 shows the state of adhesion of snow taking the ninth embodiment as an example,
and (a) or (b) corresponds to the passage of time. Slips of snow S accumulated on the outer shell
of the horn housing 2 are suppressed by the projections 5, and the snow S attempting to wrap
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around the opening is likely to be separated by the projections 5 and dropped (because the
opening is It is not blocked by the snow S, and the detection operation is not disabled. The same
function applies to an embodiment in which a groove such as a groove or a recess is formed in
addition to a protrusion such as a protrusion. Next, FIGS. 14 to 16 show a snow detecting circuit
suitable for use with the present invention, in which the snow height is corrected according to
the quality (specific gravity) of the snow to make the detection accuracy It is intended to
improve. In FIG. 15 showing the block diagram of FIG. 14 and its operation waveform, for
example, 40 kHz from the ultrasonic oscillation circuit 22 during a period when the signal a
generated from the ultrasonic transmission interval adjustment circuit $ 21 is high level. A signal
is generated, amplified to an appropriate level by the amplifier circuit 23, and the ultrasonic
wave is transmitted to the space from the transmitter / receiver 24. Then, the ultrasonic wave
reflected by the object to be measured such as snow S or roof R is received by the transmitter /
receiver 24 and becomes a signal C, and becomes a signal d of an appropriate level through the
amplification circuit 25 ° 26 and a detection circuit 27 is converted into a rectangular signal e
having an envelope of transmission and reception waves. On the other hand, a gate signal &
corresponding to the snow height to be detected and operated by the gate circuit 29 is generated
from the ultrasonic wave transmission interval adjusting circuit # 121 and is applied to one input
terminal of the gate circuit 30. Here, the output signal e of the detection chart 1527 is normally
directly applied to the other input terminal of the gate circuit 30, but in this example, the
correction circuit 28 intervenes, and the reflection level from the output C 'of the amplifier
circuit 25 is obtained. The correction circuit 28 is controlled via the measurement cycle g833
and the correction value setting circuit 34. Therefore, the absorption 2 reflection of ultrasonic
waves differs depending on the specific gravity of lightning, and an error occurs if correction is
not performed, but as shown in FIG. 16, a correction value (value to cancel out the error)
corresponding to the specific gravity of snow is obtained in advance. The specific gravity of the
lightning is predicted from the reflection level by the reflection level measurement circuit 33, and
the value of FIG. 16 is taken out from the correction value setting circuit 34 and applied to the
correction circuit 28 to perform correction for accurate detection. be able to. That is, the signal e
is shifted by the correction amount Tx to become the signal f by the operation of the correction
circuit 28, and when the signal f arrives in the period of the gate signal 6, the signal k is
generated from the gate circuit 30. The roof heater 32 is operated to perform a snow melting
operation and the like.
(Effects of the Invention) As described above, in the ultrasonic horn of the present invention,
since the convex portion or the concave portion is formed on the outer shell of the horn housing,
the snow attached by the convex portion or the concave portion is easily separated. As it falls
below when it comes to weight, it is possible for snow to get around the opening of the ultrasonic
horn (there is an effect that accurate detection operation can be performed since it will not
become inoperable).
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[0002]
Brief description of the drawings
[0003]
1 to 12 are block diagrams showing the first to twelfth embodiments of the ultrasonic horn
according to the present invention, and FIG. 13 is an explanatory view of the operation for
preventing the wraparound of snow in the present invention, FIG. FIG. 16 is an example of a
snow detection circuit, and FIGS. 17 to 19 are explanatory views of a conventional ultrasonic
horn and adhesion of snow.
Reference Signs List 1 ultrasonic horn 2 horn housing 5 protrusion 6 groove 7 cover 8 11, 11
screw 9 9 - depression, 10 ...... lid piece, P · · · · · horn housing opening surfaces, S · · · · · lightning,
R · · · · · roof
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