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JPS6372298

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DESCRIPTION JPS6372298
[0001]
TECHNICAL FIELD The present invention relates to an ultrasonic array sensor that transmits
ultrasonic waves and receives reflected waves. [Background Art 1 The ultrasonic sensor performs
sensing using a foot sound wave, and in the inspection method, it is necessary to transmit a pulse
wave and to receive an object reflected wave from the detected object. The presence detection
type pulse system that detects the distance of the distance, or “1!” Transmits the following
wave and receives the reflected wave from the moving object to detect the presence of the
moving object by the frequency shift of the reflected wave Methods are known. Since ultrasonic
waves have directivity due to their short wavelength compared to the audible range, the range to
be detected can be limited. Assuming that the directivity has a half value angle θ / 2 as shown in
FIG. 7, a detection range corresponding to that can be obtained. The detection range is shown in
FIG. Conventionally, as described above, it is possible to obtain a predetermined detection range
by obtaining a predetermined directivity. However, due to the characteristics of ultrasonic waves,
there is a fluctuation in sensitivity in transmission and reception. Variations in sensitivity may
occur due to variations in shape, quality, air fluctuations, etc., or variations in transducer
sensitivity. As shown in FIG. 7, assuming that there is a fluctuation of ΔG, a fluctuation of the
detection angle of Δθ occurs in the detection angle corresponding to the directivity angle θ /
2. As a result, as shown in FIG. Ff18, a fluctuation .DELTA.l of the detection range occurs, and
there is a problem that the detection range is very unstable. In order to obtain a particularly wide
detection range, a directional beam having a wide half-value angle is required, and there is a
problem that the fluctuation range Δθ due to ΔG, that is, Δp becomes large. [Object of the
Invention J Since the present invention has been made in view of the above-mentioned problems,
the purpose of the invention is to reliably detect within a predetermined detection range, and
variations in transmission and delivery sensitivity occur Another object of the present invention
is to provide an ultrasonic array sensor which has less influence on the fluctuation of the
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1
detection range. [Background Art] The present invention transmits ultrasonic waves, arranges a
plurality of ultrasonic elements receiving reflected waves on the same plane, and generates a
plurality of directional beams only within a detection angle where the arrangement pitch is to be
detected. It is characterized in that it is a pitch according to the detection angle to be present.
The present invention will now be described by way of examples. In this embodiment, three
ultrasonic elements 1 are arranged in a row on the same plane at a pitch of 1.4 waves (λ) as
shown in FIG. 1 to obtain a desired ultrasonic 7-ray sensor As shown in FIG. 2, it is about 100 °
at half angle θ / 2.
Thus, as shown in FIG. 3, the half value angle θ / 2 is constituted by three sharp beams, and the
detection range is set by three beams as shown in FIG. Although undetected gaps can be formed
between the beams here, this is not a problem if the gap is sufficiently small. Further, in FIG. 3,
when there is a variation ΔG in sensitivity in transmission and delivery, the variation Δθ ′ of
the directivity angle due to ΔG can be made smaller than Δθ in FIG. That is, as shown in FIG. 4,
fluctuation of detection range by ΔG! Thus, it is possible to keep
(<Δl) small. 1m In this
example, as shown in fIS5 in FIG. 6, ultrasonic elements are arranged in two waves λ (λ), and as
shown in FIG. It was possible to reduce the variation of the pointing angle as well as. [Effects of
the Invention] The present invention transmits ultrasonic waves, arranges a plurality of
ultrasonic elements receiving reflected waves on the same plane, and directs a plurality of
directional beams only within a detection angle at which the array pitch is to be detected. Since
the pitch is set according to the detection angle so as to be present, even if there is a change in
sensitivity in transmission and delivery, the change in directivity angle due to the change is small,
and as a result, the change in the detection range can be suppressed small. There is.
[0002]
Brief description of the drawings
[0003]
1 is a schematic layout view of the ultrasonic element according to the first embodiment of the
present invention, FIG. 2 is a directivity characteristic diagram of the same embodiment, FIG. 3 is
an explanatory diagram of the same embodiment, and FIG. 5 is a schematic layout diagram of the
ultrasonic wave according to the second embodiment of the present invention, FIG. 6 is a
directional characteristic diagram of the above, tlS 7 is an explanatory diagram of a conventional
example, and FIG. 8 is a detection range explanatory diagram of the same Is an ultrasonic
element.
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Agent Patent Attorney Stone 1) 七 7 Fig. 2 Fig. 4 i IJd mer i-e IQWJJ Fig. 7 Fig. 8 Procedure
Amendment (Spontaneous) 61 February 61
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3
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