JPS6022471Y2 - light beam warning device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a wireless light warning device having a plurality of light warning zones that generates a signal for identifying the blocked area when the light beam is blocked.

Such devices have been used for a long time, but when the light beam in a restricted area is blocked, how can the signal used to identify the blocked area (hereinafter referred to as the identification signal) be blocked? Depending on whether the transmission is to be made to the zone display device, 1. A method in which the detection device placed in each warning zone and the cut-off zone display device are connected in a one-to-one correspondence using dedicated identification signal wiring.

2. A method in which the wiring used to supply power to the detection devices placed in each restricted area is also used as an identification signal transmission path.

Conventional general devices employ one of the following methods.

Since devices using these methods are wired, identification signals are reliably transmitted as long as there is no disconnection, but on the other hand,
There were also problems from an economic point of view, such as the labor involved in wiring and the need for wiring maintenance if used over a long period of time.

The purpose of this invention is to use a beam of light as an identification signal for each warning area that is generated when the warning area is blocked.
To provide an optical beam warning device that uses the transmission path of the warning light beam passing through each warning area as the transmission path of the identification signal beam, thereby eliminating the need for the above-mentioned identification signal wiring, and which is easy to install and move. It's about doing.

The present invention consists of a light transmitter that generates a warning light beam modulated with continuous pulses, a plurality of light transmitters and receivers that are placed in each warning area and relays the warning light beam, and a light receiver at the final end that are connected in cascade. In the light beam warning device, when the warning light beam in any warning area is blocked, a display device connected to the light receiver identifies the blocked area, and the light transmitter/receiver and the light receiver each correspond to the A circuit that generates a pseudo signal by continuous pulses having almost the same repeating period as the above-mentioned warning light beam when the warning light beam in the warning area continues to be interrupted for a certain period of time A, and a circuit that generates a pseudo signal with continuous pulses having a repeating period almost the same as the above-mentioned warning beam, and further a circuit that generates a cut-off warning when the above-mentioned interruption exceeds a certain period of time B. A circuit for stopping the pseudo signal generating circuit at regular intervals for each number of pulses specific to the area, a circuit for holding the generation of the pulse train signal specific to the cutoff warning area for a certain period of time C, and the pulse train signal is generated. and a circuit that interrupts the relay of the warning light beam for a certain period of time, and the pseudo signal generating circuit and the circuit that stops the pseudo signal generating circuit at regular intervals, when the circuit recovers from the interruption of the warning light beam within the certain time period B, the circuit returns to its original state. In addition, the light transmitter/receiver is characterized in that each of the light transmitters and receivers converts the pseudo signal and the pulse train signal into light beams and transmits them along the same route as the warning light beam.

Hereinafter, the present invention will be explained with reference to FIG. 1, which is a block diagram of one embodiment thereof.

In the embodiment of the device of the present invention, the warning light beam is an infrared beam modulated with continuous pulses, and the identification signal beam is an infrared beam modulated with a pulse train of a constant period by a light-emitting diode LED, which is an electro-optical converter.The signal identification is performed using a pulse train. This is done by counting the number of pulses inside.

In Fig. 1, 1 is a modulated infrared light transmitter (hereinafter referred to as a light transmitter) that transmits infrared light modulated by continuous pulses as a warning light, and 2 and 3 transmit electricity when receiving the warning light. It is a modulated infrared light transmitter/receiver (hereinafter referred to as a light transmitter/receiver) that converts into a signal, amplifies it, converts it back into a light beam, and transmits the same light beam as the received light beam, and has an LED and an identification signal generator built therein.

4 is a modulated infrared receiver (hereinafter simply referred to as a receiver) which receives a warning light beam, converts it into an electrical signal and amplifies it, and has an identification signal generator built therein.

5 is a cut-off area identification device (hereinafter referred to as a display device) which has a built-in signal identification signal device for identifying the signal from the above-mentioned identification signal generator, and displays where the cut-off area is when the warning light beam is blocked. 6, 7.8 indicate the caution area.

First, in Fig. 1, a modulated infrared light transmitter (hereinafter referred to as a light transmitter) 1 constantly transmits infrared light modulated with continuous pulses of about 500 to 5000 Hz as a warning light. The light reaches the receiver 4 via the receivers 2 and 3.

Under normal conditions, the light transmitter/receiver 2 only receives the warning light beam from the light transmitter 1, amplifies it, and sends it to the light transmitter/receiver 3, and the light transmitter/receiver 3 receives the warning light beam from the light transmitter/receiver 2. The light receiver 4 receives the warning light from the light transmitter/receiver 3, converts it into an electrical signal, amplifies it, and supplies it to the display device 5. , the display device 5 does not operate in this state.

Next, we will discuss the case where the warning light beam in any of the warning areas 6.7.8 through which the warning light passes is blocked by an intruder, etc. (hereinafter referred to as "alarming"). For example, When an alarm occurs in area 6, the transmitter/receiver 2 and 3,
and the photoreceiver 4 after a certain period A (10 in the embodiment).
~20m5eC), the built-in identification signal generator generates continuous pulses with almost the same frequency as the above-mentioned warning light beam, and the light transmitters/receivers 2 and 3 transmit this continuous pulse, which is an electric signal, to the LED.
The light is converted into pulse-modulated infrared rays, and the light transmitter/receiver 2 sends the light to the light transmitter/receiver 3, and the light transmitter/receiver 3 sends the light to the light receiver 4, and the light receiver 4 directly supplies it to the display device 5 as an electric signal.

However, unless the incident light beam is blocked for a certain period of time B or more by means such as a timer, the light transmitters/receivers 2 and 3 and the light receiver 4 will return to their original operations when they receive the light beam again, that is, amplify the received light beam and transmit it. Since the operation has returned to normal, the identification signal generator built into the transceiver 3, except for the transducer/receiver 2, stops generating continuous pulses, amplifies the modulated infrared rays from the transducer/receiver 2, and transmits the light. However, the photoreceiver 4 similarly returns to the operation of converting the modulated infrared rays from the phototransmitter/receiver 3 into an electrical signal, amplifying it, and supplying it to the display device 5.

According to the above operation, the interruption time of the modulated infrared rays passing through the warning areas 7 and 8 remains only for a certain period of time A, but this is based on the fact that the normal alarm time is at least 50 to 100 m5ec. If the above operation is not performed, the modulated infrared rays as a warning light passing through warning areas 7 and 8 will be cut off for a minimum of 50 to 100 m5ec due to the warning in warning area 6, so warning areas 7 and 8 will also be in a state of confusion when the warning is issued. In other words, the modulated infrared rays generated by the continuous pulses generated by the identification signal generator serve as pseudo light beams in place of the warning light beams in the warning areas 7 and 8 in this case.

Furthermore, the warning zone 6 will be alerted for a certain period of time B (50~ in the example).
lQQmsec), the built-in identification signal generator in the light transmitter/receiver 2 shifts from generating continuous pulses to generating a pulse train at regular intervals, so the LED converts this to a continuous pulse modulated infrared ray The process then shifts to transmitting modulated infrared rays (hereinafter referred to as identification rays) in which a pulse train is generated at regular intervals.

The identification light beam from the light transmitter/receiver 2 passes through the light transmitter/receiver 3 and reaches the light receiver 4. The light receiver 4 converts this into an electrical signal and amplifies it, and displays a display device 5 as an identification signal in which a pulse train is generated at regular intervals. supply to.

Here, since the identification light beam is generated for a certain period of time C (1 to 3 seconds in the example), there is a risk of interference if the warning light beam from the light transmitter 1 reaches the light transmitter/receiver 2 again after the end of the alarm. This will not be a problem if a timer switch or the like is used at the input stage of the light transmitter/receiver 2 to block the warning light beam from the light transmitter 1 for a certain period of time C.

The same applies to alerts issued in other restricted areas.

The identification signal that has reached the display device 5 is pulsed by a built-in signal identification device to display the alarm area.

Therefore, if the identification signal generators built into the light transmitters/receivers 2 and 3 and the light receiver 4 generate signals having different numbers of pulse trains as identification signals, and if the display device 5 has a built-in signal identification device, Identification of the alarm area can be easily done.

In addition, the identification signal generator generates an identification signal when a warning light is emitted for a certain period of time of 8 or more, but since the warning light beam may be blocked by birds or leaves, it is important to avoid generating an identification signal by such instantaneous interruptions. At the same time, it is effective in preventing malfunctions caused by other disturbances.

The schematic diagrams and operations of the identification signal generation device built into the light transmitter/receiver or the light receiver and the signal identification device built into the display device used in this device will be briefly described.

First, the identification signal generating device will be explained based on the block diagram shown in FIG.
Connect the circuit as shown.

Here, the signal applied to terminal 9 is at a negative level, and the signal applied to terminal 10 is at a positive level.

In Fig. 2, 11 is an amplifier that amplifies the optical input converted into an electric signal, and DET detects the signal from the amplifier 11 and sends a positive level signal if there is a signal, and a zero level signal if there is no signal. It is a vessel.

Also, TA is a timer that turns off and sends a positive level output signal when the unmanned state continues for a certain period of time A or more, TB is a timer that turns off when unmanned power exceeds 8 for a certain period of time and sends a positive level output signal, and TC is a timer. This is a timer that is turned on by a positive level output signal from TB and sends a negative level output signal. Timers TA and ■ instantly return to the original on state when a signal from the detector DET is added, but timer TC is turned on by timer T.
B returns to off after a certain period of time after turning on.

12, 13 is an inverter, 14 is an OR circuit, and 15 is an inverter that blocks the signal from the warning light while the identification signal is being generated in order to prevent interference between the signal from the identification light and the signal from the warning light, as described in the previous embodiment. This is a switch for

Therefore, similar to the embodiment described above, the operation will be explained when it is built into the light transmitter/receiver 2. Under normal conditions, a warning light beam is received, converted into an electrical signal, amplified by the amplifier 11, and this signal sent to the detector. Since it is added to timers TA and TB through DET, timers TA and TB will remain on, but if the light beam input is interrupted due to an alarm,
As the inputs to the timers TA and TB are also interrupted, the timer TA turns off after a certain period of time A and sends an output signal, but this signal is converted to a negative level by the inverter 12 and sent to the terminal 9 through the OR circuit 14.

Further, the timer TB is turned off after a certain period of time B to operate the timer TC, and the timer TC sends a negative level signal to the OR circuit 14, and a signal converted to a positive level by the inverter 13 is sent to the terminal 10.

Even after the alarm is finished and the input is applied again to the timers TA and TB, the timer TC continues to output an output signal for a certain period of time, and the signals are applied to the terminals 9 and 10 thereafter, and the switch 15 is also turned off. It is turned off by a signal passed through the circuit 14, and as a result, the signal from the warning light after the end of the alarm is cut off at the input stage of the electro-optical converter by the developed photodiode LED for a certain period of time, and the terminals 9 and 10 are turned off.
An open signal of C is also applied for a certain period of time.

Also, in the broken line A in FIG. 2, 16 is an astable multi-by-break that operates with the input signal to terminal 9 to generate continuous pulses, and 17 operates with the input signal to terminal 10 to generate one continuous pulse. 18 is a counter that sequentially counts the decimal numbers starting from the decimal code and sequentially sends them out as the output of the binary coded decimal code, and 18 converts the output of the binary coded decimal code to the binary code and sends it to the first to ninth outputs. Decoder that sequentially sends data to terminals, 19
is a semiconductor switch that is connected to one of the above output terminals and has a timer that turns on instantly when there is an output at this output terminal and turns off after a certain period of time.

20 is a semiconductor switch 19 for resetting the positive level of the input signal from the terminal 9 to the counter 17;
Since the output signal of is also at a positive level, this is an inverter that converts it to a negative level.

Therefore, in its operation, if a signal is applied to the terminal 9 after a certain period of time A after the alarm is issued, the astable multi-vibrator 16 starts operating and generates continuous pulses.

At this time, there is no signal at the terminal 10 and the counter 17 is in a reset state, so the continuous pulses mentioned above are not counted.
7 is released from reset and starts counting the continuous pulses in decimal form from the first pulse.

This binary counting output is sent to the decoder 18 as an output of a binary binary code every time one pulse is counted, but the decoder 18 converts the output of this binary binary code into a binary code and attaches it. The signals are sequentially output to the first to ninth output terminals.

That is, when the counter 17 sends count outputs of {circle around (1)}, the decoder 18 sends the output to the first output terminal, and in the case of two count outputs, outputs it to the second output terminal.

Therefore, if the input terminal of the semiconductor switch 19 is connected to one of the decoder output terminals, the W corresponding to that connection point is
Every time the counter 17 counts the number of pulses that match the decimal code, the semiconductor switch 19 is activated by the output signal of the decoder 18 to stop the astable multivibrator 16 for a certain period of time, and at the same time, the inverter 20 converts the output to a negative level. to reset the counter 17.

If the above operation is repeated for the operating time C of the timer TC, the astable multi-by-break 16 will generate a signal containing the number of pulses determined by the connection position of the decoder output terminal and the semiconductor switch 19 at regular intervals as an identification signal. become.

Next, the signal identification device will be explained based on the block diagram shown in FIG. 23 is a timer that operates unattended for a certain period of time; 24 is a semiconductor switch that resets the counter 22 by the operation of the timer 23; 25 is the output of the binary code of the counter 22, similar to the decoder 17 described above; This is a decoder that converts the code into a binary code and sequentially sends it to attached first to ninth output terminals.

26 is a timer that operates when the input signal continues for a certain period of time.
27 is an adder circuit.

To explain the operation, when an identification signal including a pulse train is inputted to the terminal 21 at regular intervals, the counter 22 performs a binary count and sends an output of a binary code to the decoder 25.

The operations of this counter 22 and decoder 25 are exactly the same as those of the counter 17 and decoder 18 used in the above-mentioned identification signal generation device.
2 counts the first pulse, the signal is sent to the decoder 25
The second counting output is applied to the first output terminal of the
Hail appears on the output terminal.

Therefore, for example, the fifth output terminal of the decoder 25 and the timer 2
If you connect 6, an identification signal consisting of 5 pulses will be sent to terminal 2.
The timer 26 operates only when it is added to 1.

That is, when a signal containing five pulses is added at regular intervals, the counter 22 counts these pulses in order from the first pulse.

After counting five pieces, the unmanned state continues for the above-mentioned fixed interval, so the timer 2 operates unmanned for a fixed period of time.
The counter 22 continues to send five count outputs to the decoder 25 until reset by the semiconductor switch 24 connected to the counter 24, which causes the decoder 25 to continue outputting an output at its fifth output terminal for a time sufficient for the timer 26 to operate. .

The counter 22 is reset before the next pulse train is applied, and the decoder 25 also stops outputting and returns to its original state.

Since the signal containing these five pulses is input for a certain period of time C, operation can be ensured by using the adder circuit 27 and outputting an output signal when the timer 26 operates several times.

Note that the timer 26 does not operate for a signal containing pulses other than the number specified by the connection position between the output terminal of the decoder 25 and the timer 26.

Therefore, the portions after the decoder 25 may be used in one-to-one correspondence with a plurality of identification signal generating devices.

As described above, according to the present invention, it is possible to significantly reduce wiring during installation, and to provide a light beam warning device that is easy to install and expand.

In addition, according to the present invention, it is possible to provide a warning device that has a particularly excellent function of preventing false alarms.

That is, in the present invention, when the incidence of the warning light beam is interrupted for a certain period of time A, each light transmitter/receiver and the final stage light receiver first generate continuous pulses as a pseudo signal, and then transmit this as a pseudo warning light beam (the last stage light receiver). Excluding the light receiver, if a warning light beam continues to be incident for a certain period of time B from the time when the warning light beam is cut off, the generation of pseudo signals is stopped and this incident warning light beam is received, amplified, and further transmitted. This returns to the original relay operation.

This prevents the transmitter/receiver located below the area where the warning beam is actually blocked from starting the operation to display the blocked area, and also prevents the light beam from being blocked for a certain period of time A due to birds or falling leaves, especially when installed outdoors. It is possible to prevent an operation that falsely reports that the interruption of the warning beam is caused by an intruder.

In addition, if no warning light beam is incident even after a certain period of time B has elapsed since the warning light beam was disconnected, it is assumed that there is an intruder in that area, and a pulse train signal having a number of pulses specific to that area is transmitted at regular intervals for a certain period of time C. As the light is generated, the operation shifts to converting it into infrared light and transmitting it.

In this way, the operation for indicating the cut-off area is maintained for a certain period of time C, which is sufficiently longer than the normal cut-off time by the intruder, so that identification can be performed reliably, and for example, during the infrared relay by this pulse train signal, Even if the warning light beam is interrupted for less than a certain period of time A, there will be no erroneous display.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of the device of the present invention, and FIG. 2 is a block diagram of the identification signal generator and its attached circuits built into the light transmitter/receiver or light receiver of the device, and the broken line A indicates the identification signal. A block diagram of the generator, broken line B is a circuit for adding an input signal to the identification signal generator, and Figure 3 shows a block diagram of the signal identification device built into the display device of this device. Reference numerals are: 1 is a modulated infrared transmitter, 2 and 3 are modulated infrared transmitters and receivers, 4 is a modulated infrared receiver, 5 is a cutoff area identification display device, 11 is an amplifier, 12.13.2
0 is an inverter, 14 is an OR circuit, 15 is a switch, 1
6 is an astable multivibrator, 17 and 22 are counters, 18 and 25 are decoders, 19 and 24 are semiconductor switches, 26 is a timer, and 27 is an adder circuit.

Claims (1)

[Scope of utility model registration request] A light transmitter that generates a warning light beam modulated with continuous pulses, a plurality of light transmitters/receivers placed in each warning area and relaying the warning light beam, and a light receiver at the final end are arranged in cascade. In a light beam warning device, a display device connected to the light receiver identifies and displays the cut-off area when the warning light beam in the warning area is interrupted, and the light transmitter and the receiver each indicate the warning light beam in the corresponding warning area. A circuit that generates a pseudo signal by continuous pulses having a repetition period almost the same as the above-mentioned warning light beam when the interruption of the light beam continues for a certain period of time A, and furthermore, a circuit that generates a pseudo signal by a continuous pulse having a repeating period almost the same as the above-mentioned warning beam, and a circuit that is unique to the beam warning area when the above-mentioned interruption exceeds a certain period of time B. a circuit for stopping the pseudo signal generating circuit at regular intervals for each number of pulses; a circuit for maintaining the generation of a pulse train signal specific to the cutoff warning area for a certain period of time; The pseudo signal generating circuit and the circuit that stops the pseudo signal generating circuit at regular intervals, including a circuit that interrupts the relay of the light beam, are configured to stop the pseudo signal generating circuit at regular intervals.
The light beam is characterized in that when the above-mentioned warning light beam is recovered from interruption within a period of time, the original state is restored, and the light transmitter/receiver respectively converts the above-mentioned pseudo signal and pulse train signal into light beams and transmits them along the same route as the above-mentioned warning light beam. type warning device.