JPH056716B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a light beam warning device in which a plurality of light transmitters and receivers are arranged in cascade and generate a signal for identifying a blocked area when a light beam is blocked. It was designed to be able to issue a warning in a blocked off warning area.

[Conventional technology]

2. Description of the Related Art Conventionally, a light beam type warning device is known in which a plurality of light transmitters and receivers are arranged in cascade and a warning light beam is relayed and transmitted to monitor a plurality of warning areas.

In that case, in order to transmit information whose light beam has been blocked by an intruder, it is also possible to use a system that also serves as a transmission line for the warning light beam without providing a dedicated signal line.
No. 20186, JP-A-48-44096, JP-A-56-35235
It is proposed in the No.

For example, with reference to FIG. It has a light receiver 5 that receives and amplifies the light beam, and when the warning light beam in any of the warning areas 6, 7, 8, and 9 is blocked, the light transmitter/receiver corresponding to the area will display a blocking area identification display. This signal light is relayed and transmitted by a subsequent transmitter/receiver, and is identified by a cut-off area identification display device 10 installed at a monitoring station, etc., to identify the cut-off area, that is, the area where the intruder is located. was displayed.

[Problems with conventional technology]

By the way, with the conventional optical beam warning device as described above, it is possible to know the area where an intrusion is presumed to have occurred, so security guards can accordingly visit the area to confirm whether or not there has been an intrusion and conduct security measures. can be done.

However, as a practical matter, the cause of the interruption of the light beam may be a bird or tree leaf, or even a simple mistake made by a person without malicious intent. In the latter case, anglers often block the warning light beams at factories, etc. along the coast. In such a case, it would be inappropriate for the security guard to go to the restricted area from the perspective of the factory's overall security system.
It is rather dangerous.

In addition, in the case of an actual intrusion by a person with malicious intent, if one or two security guards go out to the restricted area where the intrusion occurred, the security guards themselves will be exposed to danger, and they would rather not go out. It is more advantageous to take the following procedures for crime prevention and security system.

However, there is no point in setting up a security system if we leave it as it is even though light blocking actually exists, and especially if we allow people with no malicious intent to enter as mentioned above, it would be a waste of security. It is also inconvenient to have a system.

[Purpose of the invention]

SUMMARY OF THE INVENTION In order to solve the above problems, it is an object of the present invention to provide a security device that can issue a warning to a security area when an intruder is presumed to be present.

Another object of the present invention is to achieve the above object without installing wiring such as a dedicated signal line for generating a warning.

[Structure of the invention]

The present invention includes a light transmitter that generates and transmits a warning light beam, a plurality of light transmitters/receivers arranged in cascade so as to sequentially relay the warning light beam, and a warning light transmitter/receiver from the rearmost light transmitter/receiver. and a light receiver that receives the light beam,
When the incident warning light beam of any one of the plurality of light transmitters/receivers is blocked, the blocked light transmitter/receiver generates a signal light for identifying a blocked area unique to itself;
In a light beam warning device that transmits information on a blocked area to a light receiver along the same route as a warning light beam, a warning generating device provided in each of the light transmitters and receivers;
a starting signal generation circuit that generates a starting signal for starting a specific one of the warning generating devices in response to reception of the signal light for blocking area identification display of the light receiver; the light transmitter transmits a signal light modulated by the activation signal and the warning signal, and one of the warning generation devices specified by the activation signal activates and generates the warning signal. This is a light beam warning device characterized by being configured to issue a warning in accordance with the situation.

[Function and Examples]

The present invention will be explained below based on the embodiments shown in FIGS. 1 to 7.

First, the overall circuit will be explained using Figure 1.
Reference numeral 1 denotes a light transmitter which modulates infrared rays with continuous pulses generated by a continuous pulse generating circuit 1' and emits a pulsed warning light beam. Reference numerals 2, 3, and 4 are light transmitters and receivers that sequentially relay incident light; 5 is a light receiver; and 6, 7, 8, and 9 are guarded areas. Reference numeral 20 denotes a cut-off area identification display device that, when an intruder enters any of the warning areas 6, 7, 8, and 9 and the warning light beam is interrupted, a light transmitter/receiver or light receiver corresponding to the warning area is displayed. The generated blocked area identification display signal indicates the guarded area into which the intruder has entered. Reference numeral 30 is a warning signal generating device which outputs a warning signal to the light transmitter 1 by switching the first switch 42 and the second switch 44 to advise the intruder to leave. 60-1 to 60
-4 is a warning generating device which converts a warning signal into audio and issues a warning from a speaker provided in each.

Next, the second section regarding the 20 cutoff area identification display devices.
To explain using a diagram, 21 is a decimal count of each successive pulse of the cut-off area identification display signal.
A counter that sequentially sends out the output of an evolved decimal code, 2
2 is an on-delay timer that operates without any input for a certain period of time, 23 is a semiconductor switch that resets the counter 21 by the operation of the on-delay timer 22, and 24 is a decimal converter for the output of the binary coded decimal code of the counter 21. This is a decoder that converts the code into a code and sequentially sends it to the attached first to nth (n=4 in this embodiment) output terminals. Reference numeral 25 is a timer that operates when the input signal continues for a certain period of time, and lights up the display lamp 27 of the display section 26 to display the warning area into which the intruder has entered. A relay 28 is activated by the output of each timer 25, and opens and closes a relay contact 40, which will be described later.

Next, 30 warning signal generating devices will be explained using FIG. Starting pulse signal generation circuit 31
are warning generating devices (60-1 to 60-
4)...An example will be described in which a warning generating device is specified. That is, this is a starting pulse signal generating circuit that sequentially generates a first starting pulse signal consisting of one pulse, a second starting pulse signal consisting of two pulses, and an nth starting pulse signal consisting of n pulses. 32 is an unstable multivibrator whose output is the first counter 3
3 and counted. 34 is a second counter which is activated by a start pulse from the pulse generator 35. Note that when the start pulse is received, the count value becomes 1. 36 is a comparator that compares the counts of the first and second counters 33 and 34;
When both match, a match signal is output.
37 is a monostable multivibrator, which shifts to a metastable state in response to a coincidence signal from the comparator 36;
That is, it works. Monostable multivibrator 37
If the operating time is set to e.g. t ₁ and the input signal level is longer than t ₁ to the level that makes this operate
When it lasts t ₂ hours, it is of the type that operates for t ₂ hours. The output thereof is supplied as a control input to the astable multivibrator 32, a reset input to the first counter 33, and a counting pulse input to the second counter 34, respectively. Here, the unstable multivibrator 32 is activated when the operating output of the monostable multivibrator 37 rises, and stops when it falls. The first counter 33 is reset at the fall of the operating output of the monostable multivibrator 37. Further, the second counter 34 counts 1 at the fall of the operating output of the monostable multivibrator 37. The second counter 34 has a maximum count value n, and is reset when the (n+1)th input is received. 38 is a decoder which inputs the branched output of the second counter 34 and outputs the count values 1, 2, . . . of the second counter 34.
Depending on n, gate circuits 39-1, 39-2,
. . . A gate-on signal is input to the other input of each of 39-n. The output of the astable multivibrator 32 is input to one side of the gate circuit 39 .

Reference numeral 40 denotes a relay contact of each relay 28 in the above-mentioned cutoff area identification display device 20.

Reference numeral 41 denotes a warning switch, and when pressed, the first switch 42 switches from the continuous pulse generating circuit 1' to the starting pulse signal generating circuit 31. 43 is an on-delay timer, and when the warning switch 41 is kept pressed for a predetermined time, the second switch 44 switches from the first switch 42 to an FM modulation circuit to be described later.

45, the audio signal inputted by the microphone is amplified by the microphone amplifier 46, and then sent to the FM modulation circuit 4.
7 and is FM modulated. Thus, a warning signal is output from the FM modulation circuit 47.

Next, the warning generating devices 60-1 to 60-4 will be explained with reference to FIG. In each of the light transmitters/receivers 2 to 4 and the receiver 5, a phototransistor 51 receives incident infrared light, and an amplifier 52 amplifies the received infrared light. The amplified electrical signals are sent to each of the warning generating devices 60, 60-1 to 60.
-4, and is also input to a light transmitter (not shown in the figure) in the device (light transmitter 1 in the receiver 5) and is relayed to the subsequent device as an optical signal. Warning device 6
0, 61 is a starting pulse identification circuit, and when the number of pulses input in a certain period of time matches the number of pulses of the starting pulse signal assigned to itself, and the reception of the starting pulse signal is repeated several times,
The flip-flop circuit 62 is set and an "H" output is sent to the AND circuit 63. 64 is an off-delay timer, and 65 is an on-delay timer, which, as described later, detects a warning signal from the output from the amplifier 52, and when there is a warning signal, that is, an FM modulated wave or carrier wave. On-delay timer 65 is turned on and its output is sent to AND circuit 63, which is also connected to the reset terminal of flip-flop 62 via inverter 66. The output signal of the amplifier 52 is sent to the AND circuit 6
3, so when the outputs of the flip-flop 62 and the on-delay timer 65 are at H, they pass through the AND circuit. 67 is
Output from AND circuit 63 in FM detection circuit
Detects the FM modulated audio signal and outputs it to the second
The sound is emitted from a speaker 69 via an amplifier 68. For convenience, the speakers 69 are shown outside each of the warning generating devices 60-1 to 60-4 in FIG. 1.

The operation of the above circuit will now be explained.

For convenience of explanation, the explanation will be made on the assumption that an intruder has entered the guarded area 7.

When an intruder enters the guarded area 7 and the warning light emitted from the light transmitter/receiver 2 is interrupted, the light transmitter/receiver 3 emits a signal light for identifying the blocked area to notify the person. Occur. Then, the signal is sent to the cutoff area identification display device 20 via the light transmitter/receiver 4 and the light receiver 5.

Now, it is assumed that the signal light for blocking area identification is composed of a pulse train whose number corresponds to the address assigned to the light transmitter/receiver. In this case, in order to distinguish it from the warning light beam, the pulse repetition frequency is set high so that the pulse train is repeatedly generated at the same period as the pulse frequency of the warning light beam.

Now, when the cutoff area identification display signal is input to the counter 21, the counter 21 counts it in decimal form and sends the output in binary coded decimal code to the decoder 24.
Then, an output appears on the second output terminal of the decoder 24, and the lamp 27- is output via the timer 25-2.
2 is lit for a certain period of time. This allows the security guard to know that an intruder has entered the security area of 7. At the same time, current flows through the relay 28-2, and the corresponding relay contact 40-2 becomes closed.

Note that the delay time of the on-delay timer 22 is
It is set to be longer than each pulse interval in the pulse train of the cutoff area identification display signal, but shorter than the interval between repeated pulse trains.

If the security guard wants to warn the intruder to leave, he presses the warning switch 41, and the first switch 42 switches to the activation pulse signal generation circuit 31, and after a predetermined time, the on-delay timer 43 activates. Therefore, the second switch 44 is switched to the FM modulation circuit 47 side, and the warning signal from the FM modulation circuit 47 is connected to the light transmitter 1.

Here, _the operation of the starting pulse signal generation circuit ₃₁ will be explained with reference to FIG. When the voltage is applied (FIG. 5f), the count value of the second counter 34 becomes 1 (FIG. 5e), but the count value of the first counter 33 becomes 1 (FIG. 5e).
Since the count value of is 0, the output of the comparator 36 shifts from the match signal level to the mismatch level (FIG. 5c). Therefore, the monostable multivibrator 37 shifts from the quasi-stable state to the stable state (Fig. 5 d), and at the rising edge of the state, the unstable multivibrator 32 starts and generates one pulse (Fig. 5 a).
As a result, the first counter 33 counts 1 (FIG. 5b). As a result, the counted values of both counters 33 and 34 match at 1, so a match signal is generated at the output of the comparator 36 (Fig. 5c), and the monostable multivibrator 37 shifts to a metastable state. Then, the unstable multivibrator 32 is stopped, the first counter 33 is reset, and the count value of the second counter 34 is set to 2 (FIG. 5d). Thus, the state is the same as the initial state except that the count value of the second counter 34 is 2. During this period, the number of pulses output from the unstable multivibrator 32 is one.

Now, during the above operation, when a match signal is output from the comparator 36, the first counter 33 is immediately reset, so the time between the output of the second counter 34 and the match signal of the comparator 36 is short; In FIG. 5, it is shown as a linear pulse.

Thereafter, when the operating time _t1 of the monostable multivibrator 37 has elapsed, the monostable multivibrator 37 shifts to a stable state (FIG. 5d), and the non-stable multivibrator 32 is activated. As a result, two pulses are output from the unstable multivibrator 32 at its oscillation frequency (Fig. 5a), and when the count value of the first counter 33 becomes 2 (Fig. 5b),
A coincidence signal is generated at the output of the comparator 36, and the monostable multivibrator 37 shifts to a metastable state (FIG. 5d). As a result, the operation of the unstable multivibrator 32 is stopped, the first counter 33 is reset, and the second counter 34 further counts 1 until the count value becomes 3. Thus, the initial state is restored again except that the count value of the second counter 34 is 3.

After that, the operating time t ₁ of the monostable vibrator 37
When , the unstable multivibrator 3 is activated again.
2 operates, and the count value of the second counter at that time is 3.
A pulse equal to is generated and again the second counter 3
This is the initial state except that the count of 4 is incremented by one. Thereafter, in the same manner, pulse groups with one more pulse number are sequentially selected after time _t1 .

When the count value of the second counter 34 is its maximum count value n (as mentioned above, n=4 in this embodiment), n pulses are output from the astable multivibrator and a match signal is output from the comparator 36. is output and an operational output is generated from the monostable multivibrator 37, the astable multivibrator 32 is stopped and both the counters 33 and 34 are reset, so that the device returns to its initial state.

Next, when a start pulse is input, the first pulse signal consisting of one pulse,
A second pulse signal consisting of two pulses, generally an nth pulse signal consisting of n pulses,
It is sent out sequentially every _other time t.

Note that the oscillation frequency of the unstable multivibrator 33 must be much higher than the repetition frequency of the warning pulsed light, and must be different from the pulse frequency of the cutoff area identification signal.

In reality, when the maximum count value of the second counter is set to n, the sum of the time of n pulse oscillations from the non-stable multivibrator 32 and the operating time _t1 of the monostable multi-vibrator 37 is the amount of the warning light beam. It is preferable to select it so that it has a pulse period.

The output of the unstable multivibrator 32 is input to one input of the gate circuits 39-1, 39-2,...39-n, and the output of the second counter 34 is input to the decoder 38, A gate-on signal is input to the other input of each of the gate circuits 39-1, 39-2, . . . 39-4 according to the count values 1, 2, .

Therefore, gate circuits 39-1, 39-2,...3
From 9-4, 1 pulse, 2 pulses, ...4 respectively
A pulse signal of pulses is sent out.

As mentioned above, since current is flowing through the electromagnetic relay 28-2, the corresponding relay contact 40
-2 is in the closed state, and a two-pulse pulse signal from the gate circuit 39-2, that is, a starting pulse signal is sent out from the first switch 42.

Thereafter, the switch 44 is switched to the FM modulation circuit 47 side, so when the guard faces the microphone 45 and issues a warning to the intruder, the voice is amplified by the microphone amplifier 46.
After being amplitude modulated by the FM modulation circuit 47, the light transmitter 1 is sent as a warning signal following the activation pulse signal.
sent to.

To explain this using the timing chart in Figure 6, when the light beam is blocked in the warning area 7,
Relay 28-2 is operated for time T set by timer 25-2 as described above, and corresponding relay contact 40-2 is kept on for time T as shown in FIG. 6a. When the watchman presses the warning switch 41, the first switch 42 is switched to the starting pulse signal generating circuit 31 for a certain period of time as shown in FIG. 6b. Also, after a predetermined time _T1 after pressing the warning switch 41, the on-delay timer 43 starts c.
The second switch 44 is switched to the FM modulation circuit 47 for a certain period of time as shown in FIG. Therefore, the above
During T ₁ , a triggering pulse signal is repeatedly sent to the light transmitter 1 via the relay contact 40-2, as indicated by SP in FIG. 6d. After T ₁ has elapsed, the FM modulation circuit output is sent to the light transmitter 1 as shown by A in FIG. 6d.

The light transmitter 1 transmits infrared light modulated by the activation pulse signal and the FM modulation circuit output signal toward the light transmitter/receiver 2. As a result, in place of the warning light beam, infrared light carrying this activation pulse signal and the FM modulation circuit is sequentially relayed by the light transmitter.

The output of the phototransistor 51 of the light transmitter/receiver 2 is as shown in FIG. 7a, and it is amplified by the amplifier 52 as shown in FIG.
is input. The starting pulse identification circuit 61 is
When it receives a starting pulse signal consisting of the number of pulses assigned to it, it generates light as shown in FIG. 7c and sets the flip-flop circuit 62.
The flip-flop circuit 54 inputs a set output as shown in FIG. 7d to the AND circuit 63.

On the other hand, the output of the amplifier 52 is also sent to an off-delay timer 64.

The delay time of the off-delay timer 64 is set to be shorter than the pulse period of the warning light beam. Therefore, as shown in FIG. 7e, a continuous signal is sent out when the FM modulation signal or its carrier wave A is input, and a pulse signal is sent out when a warning signal or starting pulse SP is input.

The on-delay timer 65, which receives the output of the off-delay timer 64, has a delay time set slightly longer than the pulse period of the warning light beam, so that the output of the amplifier 52 changes as shown in FIG. 7f.
Only when the FM modulated wave or carrier wave A is input, an H level signal is outputted and inputted to the AND circuit 63.

Therefore, the AND circuit 63 includes the set output of the flip-flop circuit 62 and the on-delay timer 6.
5 is input, and the output of the amplifier 52 is added to the output of the AND circuit 63.
As shown in FIG. 7g, only the FM modulated wave A is output, and this is applied to the speaker 69 via the FM detection circuit 67 and the amplifier 68. As a result, the speaker 69 emits the voice of the security guard warning the intruder in the guarded area 7 to leave (Fig. 7h).

In addition, in the above explanation, relay contact 40 and relay 2
8 may be omitted and a manual switch may be used in place of the relay contact.

〔Effect of the invention〕

As described above, according to the present invention, a warning sound can be emitted in a guarded area that has been blocked off by an intruder. It is possible to take procedures to the security stage, which has a security effect.
In addition, in order to generate a warning, the warning signal can be superimposed on the activation pulse signal and subsequently transmitted to the cut-off area by light along the same route as the warning light beam, so special wiring for warning signals is not required, making it easy to install. , there are economic advantages.

[Brief explanation of the drawing]

Figures 1 to 7 are examples of the present invention, Figure 8 is a conventional example, Figure 1 is an overall diagram, Figure 2 is a block diagram of a cut-off area identification display device, and Figure 3 is a warning signal generator. 4 is a block diagram of the warning generating device, and FIGS. 5a to 5f are 5a to 5f in FIG. 3.
Figures 6a to d are timing charts of the outputs of the signals 6a to 6d in Figure 3, and Figures 7a to h are the outputs of the warning generator parts 7a to 7h in Figure 4. It is a timing chart diagram. In the figure, 1 is a light transmitter, 2 to 4 are light transmitters and receivers, 5 is a light receiver, 6 to 9 are warning areas, 20 is a cutoff area identification display device, 30 is a warning signal generator, and 60 is a warning generator. be.

Claims (1)

[Claims] 1. A light transmitter that generates and transmits a warning light beam;
It has a plurality of light transmitters and receivers arranged in series so as to sequentially relay the warning light beam, and a light receiver that receives the warning light from the rearmost light transmitter and receiver, and one of the plurality of light transmitters and receivers. When any of the incident warning light beams is interrupted, the intercepted light transmitter/receiver generates its own unique signal light for identifying the blocked area, and transmits information about the interrupted area along the same route as the warning light beam. In a light beam warning device configured to transmit light to a light receiver, a warning generating device provided in the light receiver and each of the light transmitting/receiving devices, and in response to reception of the cutoff area identification display signal light of the light receiver, The light transmitter includes a starting signal generating circuit that generates a starting signal for starting a specific one of the warning generating devices, and a warning signal generating device that generates the warning signal, and the light transmitter A light beam characterized in that a signal light modulated by a warning signal is sent out, and one of the warning generating devices specified by the activation signal is activated to generate a warning in accordance with the warning signal. type warning device.