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JPS5734676

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DESCRIPTION JPS5734676
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view of an ultrasonic switch
using a transducer according to an embodiment of the present invention, FIG. 2 is an exploded
view of part A in FIG. 1, and FIG. FIG. 4 is an operation explanatory view of the above. 2 иии и и и и и и и
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DETAILED DESCRIPTION OF THE INVENTION In the present invention, an ultrasonic wave is
transmitted, and the transmitted ultrasonic wave collides with an object and receives a reflected
wave that is repelled to detect the presence of the object and detect an electric device. The
present invention relates to a reflective ultrasonic switch to be operated. In general, after the
transmitter / receiver has added the transmission pulse signal to the microphone attached to its
base, the horn continues to vibrate and the reverberation remains, and the switch is prevented
from malfunctioning by receiving this reverberation. For this purpose, a gate circuit ? is
provided to pass the wave receiving signal after a predetermined time has elapsed from the end
of the application of the transmission pulse signal to the disappearance of the residual winding.
However, if reverberation remains for a long time, it is necessary to increase the time for the gate
to open after sending a 1 1 * 1 \ j \ "-\ '3' 1 176 1 wave pulse signal. In this case, there is a
problem that it is not possible to detect or detect an object at a short distance, which takes a
short time until receiving a reflected wave. The present invention has been made in view of the
above embodiments, and the object of the present invention is to provide a reflection type
ultrasonic wave in which the vibration of the horn is reduced to reduce the reverberation by
fitting a ring plate around the upper end edge of the horn. The present invention is to provide a
switch transducer. Hereinafter, an embodiment of the present invention will be described based
on the drawings. 1 is an ultrasonic switch main body, 2 is a transmitter / receiver mounted on
the J of the main body 1 via a rotary ball 3 and a microphone 5 for transmitting and receiving is
mounted on the base of the horn 4 The inter-digital nature of the ultrasonic wave emitted from 5
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is improved by the horn 4. Numeral 6 is a mesh for insectproof ? for preventing insects and the
like from invading the inside of the horn 4. 7 is a ring plate made of molded resin, and a convex
step 8 is formed at the lower end of the inner peripheral barrel, and a projection 9 having a
square cross-sectional shape is provided at the tip of the convex step 8. 2. When ultrasonic
welding is performed between the mesh 6 and the recessed step 16 of the horn 4, the projection
9 provided at the tip of the protruding step of the ring plate 7 is embedded in the mesh and the
tapered surface 11 of the projection 9 , And the net 6 is tightened and fixed. Further, a flange
portion 12 is formed at the lower end of the outer peripheral leg of the ring plate 7, and the
flange portion 12 is fitted to the outer periphery of the upper end edge of the horn 4. FIG. 3 is a
block diagram of the ultrasonic switch apparatus. In the transmitter unit 13, the integration
circuit 14 determines the transmission signal interval @Tl, the single relief multi circuit 15
determines the transmission signal width T2, and oscillation occurs. A circuit 16 produces a tone
burst wave of, for example, 89.5 KHz and of duration T 2 and emits an ultrasound signal from
the transducer 2. The ultrasonic signal reflected by the object 18 is returned to the transmitter /
receiver 2 again to be converted into an electric signal, amplified by the amplifier circuit 20 of
the receiver unit 19, and separated and removed by noise by the tuning amplifier circuit 21 for
detection. ? sent to circuit 22
The comparator circuit 23 determines the signal level by ? and simultaneously determines
whether the signal has returned by a single time stable multi circuit 24 that emits a distance gate
signal within a certain time period. . gate. The signal within the upper time is sent to the flip flop
circuit 25 to operate the relay 27 by the switching circuit 26. Even if the oscillation circuit 16
generates a signal S of duration T2 and between signals @Tl as shown in Fig. 4 fa), the
conventional transducer keeps a long duration as shown in Fig. 4 (b). Since the reverberation
wave R1 having time TA is not generated and the reflected wave returned in time TA can not be
accurately captured, the distance gate signal Gl is generated after time TA elapses as shown in
FIG. There is a problem that it is necessary to open the gate to open the gate and it is not possible
to detect the reflected wave from a short distance, but when the link plate 17 is fitted around the
upper edge of the horn 4 as in the example of the present invention. Since the vibration of the
horn 4 becomes smaller and the duration TB of the reverberation wave R2 becomes shorter as
shown in FIG. 5 (d), the distance gate signal G2 can be generated after the passage of the time
TB. It is possible to: ? As described above, the transmitter and receiver microphones are
attached to the base of the horn and the upper edge outer 'peripheral nilling plate is fitted on the
base of the horn, so that the horn vibration 4 ░ is attenuated and reverberation is small. There is
an effect that detection of an object at a short distance becomes possible.
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