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Specification 15 Title of Invention
Transmission and reception of ultrasonic warning device
8. Detailed Description of the Invention 1 The present invention relates to the interference
between the wave transmitting and receiving parts of the ultrasonic warning device, and the
object of the invention is to provide a transmitting and receiving and wave parts configuration
with good detection sensitivity. 1 In the conventional transmission and reception of the
ultrasonic alert device, as shown in Fig. 1, the transmitting element A and the receiving element B
are arranged in a plane as shown in Fig. 1, but changes in Doppler frequency are Although the
sensitivity to movement toward or away from the alert 4D to detect 1 is good, if the change in
the lateral direction is detected, the sensitivity is high. In the case where the ceiling surface is to
be covered to round the detection area by rounding to expand the detection area, the detection
sensitivity is rather deteriorated. In general, for the movement of the movable body M with
respect to the warning device as shown in FIG. 2, assuming that the sound velocity is C1
transmitting frequency f and the town moving body velocity change is V, the noise frequency is 1
d Δ f = In the movable body M which moves so as to cross it against the alarm as in the third
time, the angle between the movement line and the centripetal line to the alarm M is θ When it
is assumed that Δf ′ = 2v “ooa (iJ_th” h, I, “tdl−1fΔr′dil”: always smaller, as shown in
FIG. It is out of the common area and not detected. SUMMARY OF THE INVENTION The present
invention is directed to a transmission / reception single wave configuration of an ultrasonic
alerting device which can be attached to a ceiling surface and has a high detection sensitivity. Describe the transmission / reception plate configuration of the ultrasonic alert according to the
present invention by referring to FIGS. 4 to 7 as the embodiment below. An overlapping reflector
block is formed, and the wave transmitting element A and the wave receiving element B are
separately provided at the center of the ridge-like reflection EndPage: 1 plate at 1 * Kt + K. As
shown in FIG. 4, a few reflections are made on the ceiling surface H as shown in FIG. The
ultrasonic wave is projected in a wedge shape from the wave transmitting element A in a
direction, and the reflected wave enters the wave receiving element B from between 2 and the
outer wedge-shaped reflection plate to the middle wedge-shaped reflection plate. Therefore, as
shown in FIG. 6 and FIG. 7, the detection area is enlarged because the annular detection area S is
bite centered on the warning device, and the movable body M has a floor surface with respect to
the detection area S. When moving on F, the angle θ 'between the warning device direction and
the floor F changes, and the amount of movement change in the direction directly facing the
warning device is increased, and changes in Doppler frequency and number become large and
detected. It will be easier.
As described above, according to the transmitting / receiving part configuration of the ultrasonic
warning device according to the present invention, the wedge-shaped reflecting plate is used to
radiate the ultrasonic radiation pattern I composed of the transmitting wave element and the
passing element in the form of a bowl. This makes it possible to detect changes in the Doppler
frequency with respect to the movement of the movable body across the detector with high
sensitivity and good feedback. Furthermore, since the wave transmitting element and the wave
receiving element are coaxially arranged at the mutual centers of the superposed wedge-shaped
reflectors, the ultrasonic waves from the wave transmitting element are not directly projected to
the wave receiving element, and this is also possible. It is also a dread and tear with 11 parts of
transmission and reception of an ultrasonic alerter that feels good, such as seeing that the
Doppler frequency is upset.
4. Brief description of the drawings. FIG. 1 is a front view showing a transmission / reception unit
of a conventional ultrasonic alert, FIG. 2 is a view showing its removal 1 and FIG. 3 is a view
showing one detection. Fig. 4 is a cross-sectional front view showing the configuration of the
transmitter-receiver section of the ultrasonic warning device of the present invention, Fig. 5 is a
perspective view, Fig. 6 is a view showing a detection state, and Fig. 7 is a projection pattern on
the floor surface. FIG. A: Transmitting element, B: Receiving element, Kl * Kt * Kl: Wedge-shaped
reflector. First father) Fig. 4 Fig. 5i · EndPage: 2
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