JPS58140931A - Synchronizer for supersonic switch unit - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention The present invention provides an ultrasonic device in which a plurality of ultrasonic switches are installed in the same sound field, and each ultrasonic switch is synchronized when transmitting ultrasonic pulses. The present invention relates to a synchronization device for a sonic switch device.

Generally, an ultrasonic switch is a device that vibrates a transducer at fixed or arbitrary intervals to transmit ultrasonic pulses into a detection area, and detects the object by receiving reflected waves from the object. It is. When multiple of these ultrasonic switches are installed in the same sound field, a synchronization circuit is provided to eliminate mutual interference caused by the ultrasonic pulses transmitted from each ultrasonic switch.
By connecting the respective synchronous circuits, the ultrasonic pulse transmission ties of each ultrasonic switch are made to be the same. Figure 1 shows an example in which two ultrasonic switches A1, Ap, and k are installed. h) in the figure is a periodic oscillation circuit consisting of an integrating circuit, which oscillates at a predetermined period to generate a synchronous circuit in the next stage. (5) is input. (3) is a drive circuit for driving the ultrasonic transducer, which processes the output signal from the synchronous circuit (5) and is composed of, for example, an oscillator, an amplifier, etc. (6) is a synchronization terminal for connecting the synchronization circuit (5) of each ultrasonic switch A1, A2 so as to act as a transmission timer for the ultrasonic pulse of ultrasonic switch A1, A2, and is for signal and ground. It consists of a pair, each with the same polarity connected. Synchronization is achieved by connecting these synchronization terminals (6), respectively, and the transmission timer for the ultrasonic pulses from each ultrasonic switch Al and A2 is made the same. In the case of such a conventional example, the power line, / (earth line in the case of Fig. 1)
commercial power supply (AClooV,
If a power supply that is not insulated from the commercial power source, such as a trussless circuit, is used in the circuit that creates the DC power supply for the drive circuit (3) for ultrasonic pulse transmission or signal processing from 200V AC, etc.). had the problem of short circuits occurring between lines.

The present invention has been provided in view of the above-mentioned points, and includes a synchronization circuit for making the transmission ties Ev'j of the ultrasonic pulses of a plurality of ultrasonic switches used in the same sound field the same. The present invention provides a synchronization device for an ultrasonic switch device whose purpose is to electrically insulate it from a sonic switch.

Embodiments of the present invention will be described in detail below with reference to the drawings. As before, multiple ultrasonic switches are installed in the same sound field,
Each ultrasonic switch is formed with the same configuration. Further, the internal configuration of the ultrasonic switch is formed substantially the same as the conventional one. Although FIG. 2 shows an example in which two ultrasonic switches A1 and A2 are installed, the ultrasonic switches A2 and subsequent ones are configured in the same way. +1) in the figure is resistor R4 and capacitor C
This is a periodic oscillation circuit consisting of an integrating circuit with I and outputs an oscillation output at a predetermined period. (5) is a synchronous circuit,
Consisting of buffer gate Gl, buffer gate G1
The output of is the drive circuit (3) that drives the ultrasonic transducer.
is input. The PCI is a photocoupler that is an optical coupling means, and is composed of a light emitting diode LED on the input side and a phototransistor PT on the output side.The light emitting diodes T and KD on the input side are connected to a synchronization terminal for external connection ( 21) (22) is not connected. The phototransistor FT has a resistor R2 grounded from its emitter to form an emitter follower circuit, and its output end is connected to a terminal (2) of a switch SW1 serving as a switching means. switch S
Terminal {circle around (2)} of W1 is connected to a connection point between resistor R4 and capacitor C1 of the integrating circuit, and this switch SWl enables selective switching between the output of the periodic oscillation circuit (+) and the output of the phototransistor PT. A common terminal (2) of the switch SW1 is connected to the input terminal of the buffer gate G1 via a resistor R3. The output terminal of the buffer gate G1 is connected to the input terminal of the drive circuit (3) as described above, and
It is connected to one terminal (41) of the synchronization terminal (4).

The other terminal (42) is grounded. Same, Tiode D.

is for discharging the electric charge of the drive circuit () (-).These ultrasonic switches -'kl
, A2, the selection state of the switch SW and the synchronization terminal (2
The connection is made between f and tQ. In order to synchronize the plurality of ultrasonic switches AlXA2, . . . , first, one ultrasonic switch A1 is used as a reference, and the other ultrasonic switches A2, . That is, the switch SW1 of the reference ultrasonic switch A1 is connected to the terminal (2) so that the integrated output is input to the buffer gate G1 via the common terminal of the switch SW1. On the other hand, the switch S Wl of the ultrasonic switch A2 that follows and operates
is connected to the terminal (2), and the output of the photocoupler PCI is inputted to the buffer agater via the common terminal (2). On the other hand, the synchronous wiring is the synchronous terminal (4) of the ultrasonic switch A1.
1) (42) k Connect to the synchronization terminals (21) and (22) of other ultrasonic switch A2 to follow, and ultrasonic switch A1
The output of the buffer gate G1 is input to the light emitting diode LKD of the photocoupler pal of the ultrasonic switch A2. Synchronization terminal of the ultrasonic switch A2 (
4) is connected to the synchronization terminal (2) of the next-stage ultrasonic switch A3, and if you increase the number of connections in the same way, other ultrasonic switches A2, etc. will be connected according to the reference ultrasonic switch A1.
・ will work.

Therefore, in the ultrasonic switch A1, the height C
1 and resistor R4 according to the time constant as shown in Figure 3 (
When the voltage increases as shown in a), the input level of the buffer gate Gl connected by the switch SW increases, and when it exceeds the threshold level, the output of the buffer gate Gl becomes as shown in Figure 3(b). changes from L level to H level. When the output of the buffer gate G1 of this ultrasonic switch Al becomes H level, current flows through the photocoupler-PCI light emitting diode LED of the other ultrasonic switch A2, and the phototransistor FT is turned on to the level at the point in the figure. becomes H level as shown in FIG. 3(a), the input level of buffer gate G2 connected by switch SW1 becomes H level, and its output also becomes H level. When the output level of each buffer gate G1 becomes H level, the respective ultrasonic switches A1,
The drive circuit (3) in A2 is driven to drive the ultrasonic transducer to transmit ultrasonic pulses. Similarly, in order to discharge the charge of the integral circuit tC1 and cause periodic oscillation, a signal as shown in FIG. The signal becomes a bell, and the charge in the conducer C1 is discharged. Further, A to D shown in FIG. 2 and FIG. 3 correspond to each other. t in the diagram
3 is the transmission repetition time of the ultrasonic pulse. With this configuration, the ultrasonic switch A1 and the ultrasonic switch A2 are electrically insulated by the photocoupler PC1, and the other several units transmit ultrasonic pulses according to the reference one. It is possible to make the wave timing and 7 ji the same.

As described above, the present invention includes a periodic oscillation circuit that oscillates and outputs at a predetermined period, an optical coupling means whose input side is connected to a first synchronization terminal for external connection, and an output of the optical coupling means. and a synchronous circuit for driving a drive circuit to transmit ultrasonic pulses in response to the output of the switch means;
and a second synchronization terminal for external connection to input the output of the synchronization circuit to the first synchronization terminal of another ultrasonic switch,
The output of the periodic oscillation circuit of the reference ultrasonic switch is inputted to the synchronous circuit via the switch means, and the output of the synchronous circuit drives the drive circuit, and the other ultrasonic switches are connected from the second synchronous terminal. The first synchronous terminal of each ultrasonic switch is input to the optical coupling means, and the output of the optical coupling means is inputted to the synchronous circuit via the switch means. Even if synchronization wiring is performed between the synchronization terminals of the Sonic switches can synchronize the transmission timing of ultrasonic pulses through optical coupling means, and electrical insulation between the ultrasonic switches connected for synchronization is required. Therefore, even if a power source that is not insulated from the commercial power source is used, there will be no short circuit between the commercial power sources.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a conventional example, FIG. 2 is a specific circuit diagram of a main part of an embodiment of the present invention, and FIGS. 3(a) to 3(a) are operational waveform diagrams of the same. (+) is a periodic oscillation circuit, (2) is the first synchronization terminal, (3
) shows a drive circuit, (4) shows a second synchronous terminal, and (6) shows a synchronous circuit. Agent Patent Attorney Ishi 1) Choshichi

Claims (1)

[Claims] +1+ - A plurality of ultrasonic switches are installed in the same sound field to detect the detected object by transmitting ultrasonic pulses at each step or at arbitrary times and receiving the reflected waves from the detected object. A synchronization circuit that has the same transmission timing to eliminate mutual interference caused by transmission of ultrasonic pulses by the sonic switch, and a synchronization terminal for external connection to connect the synchronization circuit of each ultrasonic switch to each ultrasonic switch. In an ultrasonic switch device, the ultrasonic switch device is provided with a synchronization terminal of each ultrasonic switch to make the transmission timing of ultrasonic pulses the same, and a periodic oscillation circuit that oscillates and outputs at a predetermined period;
The input side is the first one for external connection. an optical coupling means connected to a synchronization terminal of the optical coupling means, and a switch means capable of selectively switching between the output of the optical coupling means and the output of the periodic oscillation circuit;
A synchronous circuit for driving a drive circuit to transmit ultrasonic pulses in response to the output of the switch means, and a synchronous circuit for inputting the output of the synchronous circuit to the first synchronous terminal of another ultrasonic switch (for external connection). The output of the periodic oscillation circuit of the reference ultrasonic switch is input to the synchronous circuit via the switch means, and the drive circuit is driven by the output of the synchronous circuit. The synchronous terminal of the ultrasonic switch is inputted to the optical coupling means via the first synchronous terminal of another subordinate ultrasonic switch, and the output of the optical coupling means is inputted to the synchronous circuit via the switching means. Ultrasonic switch device synchronization device.