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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing an essential part of
an ultrasonic direction detecting sensor according to an embodiment of the present invention.
DESCRIPTION OF SYMBOLS 1 ······ Substrate, 2 ········ Bimorph, 3 ······· Output lead wire, 4 ······ Case.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an ultrasonic
direction detection sensor, in particular comprising two bimorphs producing a phase difference
between their outputs by means of a sound source position # as a sound sensing element, and
the spacing of these bimorphs The present invention relates to an integrated sensor for detecting
an ultrasonic direction, which is distributed on a single substrate as n times the wavelength of
the sound wave (where n ≦ H). Conventionally, so-called sonar or the like for detecting the
direction of arrival of sound waves of relatively low frequency in the sea such as a submarine is
well known as the '48 -104354-02 'as the sound source from the stopped or moving sound
source. In this sonar or the like, a method of using a single directional microphone to detect the
direction of a sound source, and two similar microphones arranged on the stomach according to
the wavelength of the incoming sound wave. However, detecting the direction of the sound
source using the directivity of the microphone has limitations in narrowing the directivity of the
microphone, and the sound source can be limited by only one microphone. Because it is
necessary to rotate the microphone relative to the sound source in order to detect which
direction the left or right is in, it takes time to detect, and there is a drawback that the associated
mechanism becomes complicated. Even when two microphones are used, because the wavelength
of the sound wave to be detected is long, they have to be widely distributed separately, and the
two My Rofo 2, there is a drawback that it is not possible 48-104354-03m eating. It is an object
of the present invention to eliminate the above-mentioned drawbacks and to provide a
directional detection sensor with high detection accuracy and a compact integral structure. That
is, in the present invention, the region of the used sound wave is a number of ultrasonic waves of
several wavelengths, and two bimorphs as sound sensing elements are arranged on a single
substrate at an interval of n times (n s) of the wavelength. According to the point K, the position
of the sound source does not cause a phase difference between the outputs of the two bimorphs,
and this is detected by an appropriate phase ejector, which is much higher than the method using
the directivity. In order to detect the direction of the sound source. The present invention will be
described in detail with reference to the drawings. The drawing is a perspective view showing the
main part of an ultrasonic direction detecting noncer according to one embodiment of the
present invention, (1) is a substrate as a single substrate, (2), (2) is a bimorph as a sound sensing
element, +3) (3) is the output of each bimorph f2) (2). 7 、 汗 モ = = ド (, (4) shows the case.
As shown in the figure, the ultrasonic direction detection sensor of the present invention has two
bimorphs +23 (2) at an interval corresponding to n times the wavelength (λ) of the ultrasonic
wave to be detected (where n <) f) +, K Place (nλ) and place it on a single substrate such as
Bakelite or other insulator substrate (1), store these in a case (4) and pull out each output lead @
t3) (3) The structure is such that the frequency of the sound wave in common use is in the
ultrasonic wave range, and the distance between the two bilfs +2) (2) corresponding to the
wavelength can be narrowed extremely from K. Two bimorphs + 2> f 2) should be targeted at
intervals of the ultrasonic wave wavelength to be targeted, so that the waves coming from the
earthwork two bimorphs 2) (2) K perpendicular direction (arrow A) Let the output excited by と
be a reference output without a phase difference, gtd and be excited by a wave coming from
either the left or right direction in a vertical plane including 絆 that connects two bimorphs + 2) +
21 Depending on the direction, the ratio between the two bimorphs (2) and (2) to the length nλ
is 4B-104354-05-4-000; Since the degree, that is, the phase difference appears in proportion to
the angle formed with the basic one direction, the outputs from the two bimorphs f2) (2) are
respectively taken out by the output lead @ (3) (3), Appropriate phase detection In by detecting,
it is possible to detect the position of the ultrasonic sound sources arrives. The phase detection 5
described above compares the phase of the output of each of the two bimorphs (2) (2), and if it is
a book that can detect the phase lead and lag and the phase difference, its structure type in the
present invention It does not ask. In addition, in the above-mentioned explanation, a single planar
detection space area by only two bimorphs (2) f2) is described, and this is a multi-unit sensor of
the present invention equipped with two bimorphs. It should be understood that this suggests
that direction finding can be applied to all three-dimensional spatial regions. As described above,
in the present invention, as with the audible sound 4B-104354-0 [3-5- "" "wave, the speed of
propagation of light or electromagnetic wave is fast, and the wavelength is shorter than the
acoustic sound wave. Because ultrasound is used, two bimorphs can be arranged at a sufficiently
narrow distance so as to be able to be configured as a small integral structure sensor, and a
phase difference is generated between the outputs from the bimorphs depending on the position
of the sound source. As a result, direction detection can be performed with extremely high
precision by electrically detecting the phase difference.
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