JPH0444992B2 - - 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 successively arranged to 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 warning light beams without providing a dedicated signal line.
20186, Japanese Patent Publication No. 48-44096, Japanese Patent Publication No. 56-35235, etc.

For example, with reference to FIG. 8, such a warning device includes a light transmitter 1, a plurality of light transmitters and receivers 2, 3, and 4 arranged in succession, and a warning signal from the rearmost light transmitter and receiver 4. 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. I was trying to display the area.

[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 at factories and other facilities along the coast.
In such cases, it is rather dangerous for security guards to go out of their way to visit restricted areas, considering the overall security system of the factory.

In the case of actual intrusion by a malicious person,
If one or two security guards go out to the restricted area where there has been an intrusion, they will be putting themselves at risk, so it would be better to take the next steps to set up the security system without going out. It's advantageous.

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-mentioned 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 have entered the area.

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 having a recording means for pre-recording a warning sound provided in each of the transmitters and receivers; , a warning command signal generating device that generates a warning command signal for operating a specific one of the warning generating devices in response to reception of the cut-off area identification signal light of the light receiver, and the light transmitter generates a signal light modulated by the output signal of the warning command signal generating device, and one of the warning generating devices specified by the warning command signal is activated to generate a warning sound recorded in the recording means. This is a light beam warning device characterized by being configured to.

[Function and Examples]

The present invention will be explained below based on the embodiments shown in FIGS. 1 to 6.

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 11' and emits it as a pulsed warning light beam. 2, 3, 4 are light transceivers that sequentially relay incident light; 5 is a light receiver; 6, 7, 8, 9
is a caution area. Reference numeral 20 denotes a cut-off area identification display device which, when an intruder enters any of the warning areas 6, 7, 8, and 9 and the warning beam is interrupted, transmits and receives a light transmitter or receiver corresponding to the warning area. The signal light emitted from the block area identification display indicates the guarded area into which the intruder has entered. Reference numeral 30 denotes a warning command signal generating device having a plurality (m) of pulse signal generating circuits 31. Reference numeral 50 is a warning generating device, which has a recording device that records warning information, and is provided in the light transmitter 1 and each of the light transmitters and receivers 2, 3, and 4.

Next, the second section regarding the 20 cutoff area identification display devices.
To explain using a diagram, 21 is a counter that counts successive pulses of the cutoff area identification display signal in decimal format one by one and sequentially sends out an output in binary coded decimal code;
22 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 converting the binary coded decimal code output of the counter 21 into a decimal number. 1st to nth numbers converted into codes and attached
This is a decoder that sequentially sends signals to output terminals (n=4 in the case of this embodiment). 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. 28 is a relay that is activated by the output of each timer 25, and is connected to relay contact 4, which will be described later.
Open and close 0.

Next, the pulse signal generating circuit 31 will be explained using FIG. 3. 32 is an unstable multivibrator whose output is input to a first counter 33 and counted. 34 is a second counter which is activated by a start pulse from a pulse generator 35. Note that the count value becomes 1 when the start pulse is received. A comparator 36 compares the counts of the first and second counters 33 and 34, and outputs a coincidence signal when they match. 37 is a monostable multivibrator, and the comparator 36
A coincidence signal causes the device to enter a metastable state, that is, to operate. The monostable multivibrator 37 is of a type whose operating time is set to, for example, t ₁ and operates for t ₂ hours when the input signal level continues for t ₂ hours longer than t ₁ at a level that makes it operate. And the output is the non-position stable multivibrator 32
, a reset input for the first counter 33, and a count pulse input for the second counter 34, respectively. Here, the unstable multivibrator 32 is started 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 receives the branched output of the second counter 34 as an input, and operates gate circuits 39-1, 39-2, . . . 39- according to the count values 1, 2, .
A gate-on signal is input to the other input of each of n. The output of the astable multivibrator 32 is input to one side of the gate circuit 39 .

m pulse signal generating circuits 31 each having such an internal circuit are provided in the warning signal generating device 30, and the number is equal to the number of recorders in the warning sound generating device 50, which will be described later. Further, the output pulses of all the gate circuits of the plurality of pulse signal generating circuits are all different. The number of gate circuits 39 is equal to the number of guard zones 6, 7, 8, and 9. Reference numeral 40 denotes a relay contact, which corresponds to each relay 28 in the cutoff area identification display device 20. That is, 40-1, 40-
2-1,...40-m-1 relay contact is relay 2
Corresponding to 8-1, 40-1-2, 40-2-2,
The relay contact of 40-m-2 corresponds to relay 28-2, and in the same manner, 40-1-4, 40-
2-4, 40-m-4 relay contact is relay 28
-4 is supported. 41 is a warning switch, and when pressed, the switch 42 switches from the continuous pulse generating circuit 1' to the desired pulse signal generating circuit 31.

Next, 50 warning sound generating devices will be explained with reference to FIG. In each light transmitter/receiver, the infrared light incident thereon is received by a phototransistor 51 and amplified by an amplifier 52, while the light transmitter 1 amplifies the received electrical signal and relays it to a subsequent device as an optical signal. The output of amplifier 52 is also input to warning generator 50 .

In the warning generating device 50, 53 is a warning command signal identification circuit which operates in response to a pulse signal sent from the warning command signal generating device 30 and starts the recorder 54. Reference numeral 55 is an amplifier that amplifies the output of the recorder 54 and sends it to the speaker 11.

Note that different words are recorded in each recorder 54. A speech synthesizer can be used instead of a recorder.

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 beam emitted from the light transmitter/receiver 2 is interrupted, the light transmitter/receiver 3 generates a blocked area identification display signal to report this. . 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 cut-off area identification display signal consists 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 period 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 at the second output terminal of the decoder 24, and is output to the lamp 27-2 via the timer 25-2.
lights up for a certain period of time. That makes the guard 7
It is possible to know that an intruder has entered the restricted area. At the same time, current flows through the relay 28-2, and the corresponding relay contacts 40-1-2, 4
0-2-2,...40-m-2 are closed at the same time.

At this point, the security guard asks the intruder to leave the restricted area 7 by operating the recorder 54 that records the desired words, such as 54-1, from among the recorders 54 that record different words. If you want to give a warning, press the warning switch 41 and turn the switch 42 to 42-
Switch from contact 0 to contact 42-1. Then, the second terminal of the pulse signal generating circuit 31-1 (the terminal corresponding to the switch 40-1-2) is connected to the light emitter 1.

Here, the operation of the pulse signal generation circuit 31 will be explained with reference to FIG. 5. From the initial state up to time t ₀ , a start pulse is applied from the pulse generator 35 to the second counter 34 at time t ₀ . (Fig. 5f), the count value of the second counter 34 becomes 1 (Fig. 5e), but the count value of the first counter 33 is 0, so the output of the comparator 36 matches. From the level of the signal to the level of mismatch (Figure 5c). Therefore, monostable multivibrator 3
7 moves from a metastable state to a stable state (Fig. 5 d),
At that rise, the unstable multivibrator 32
starts and generates one pulse (Fig. 5a), which causes the first counter 33 to count 1 (Fig. 5a).
Figure b). 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).
The monostable multivibrator 37 transitions to a metastable state (Fig. 5d), and the unstable multivibrator 3
2 and reset the first counter 33,
Let the count value of the second counter 34 be 2. 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, except that the count value of the second counter 34 is 3.

Thereafter, when the operating time t ₁ of the monostable multivibrator 37 has elapsed, the non-stable multivibrator 32 operates again, and a pulse equal to the count value 3 of the second counter at that time is generated, and the second counter 34 counts again. This is the initial state except that the count is incremented by one. Thereafter, in the same manner, pulse groups with one more pulse number are sequentially selected after time _t1 .

The count value of the second counter 34 is the maximum count value n (in this embodiment, since the warning area is 4, n=
4), n pulses are output from the astable multivibrator, a match signal is output from the comparator 36, and the monostable multivibrator 3
When the operating output is generated from 7, the astable multivibrator 32 stops and the counters 33 and 34
Since both are reset, 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 needs to be much higher than the repetition frequency of the warning pulse light and 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 operation time _t1 of the monostable multi-vibrator 37 is the pulse of the warning light beam. It is best to choose a periodicity.

Of course, it is necessary to make the oscillation frequency of the non-stable multi and the operating time t ₁ of the monostable multi different for each pulse generator 31.

The output of the unstable multivibrator 32 is input to one input of the gate circuits 9-1, 39-2, ... 39-n, and the output of the second counter 34 is input to the decoder 38, 3
According to the count value 1, 2...4 of 4, the gate circuit 39
A gate-on signal is input to the other input of each of -1, 39-2, . . . 39-4.

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

As mentioned above, since current is flowing through the relay 28-2, the relay contact 40-1-
2, 40-2-2,...40-m-2 are in a closed state. Since the security guard has selected switch 40-1-2, 3 of the pulse signal generation circuit 31-1
A two-pulse pulse signal, ie, a warning command signal, is sent out from the gate circuit 9-2 and applied to the light transmitter 1 via the switch 42.

Warning command signal generator 30 sent to light transmitter 1
The warning signal from the warning generating device 50- of the light transmitter 1
1, each warning command signal identification circuit 53
-1, 53-2, 53-n does not match the predetermined number of pulses, so the warning generator 50
-1 does not work. On the other hand, the warning command signal is from transmitter 1.
The light is superimposed on the infrared light emitted from the light source and transmitted to the light transmitter/receiver 2. As shown in FIG. 6a, the output of the phototransistor 51 of the light transmitter/receiver 2 outputs a warning command signal AT while the warning switch 41 is operating. This signal AT is amplified by the amplifier 52 as shown in FIG. 6b, and each warning command signal identification circuit 53-1, 53
-2,53-m, is input. Here, only the number of pulses of the warning command signal matches the number of pulses predetermined in the warning command signal identification circuit 3-1, and does not match the number of pulses of the other warning command signal identification circuits. Therefore, only the warning command signal identification circuit 53-1 operates, and its output (Fig. 6c) causes the recorder 54-1 to operate for a certain period of time (Fig. 6d), and no sound is recorded. The voice is amplified by the amplifier 55, and the intruder in the security area 7 is told to leave from the speaker 11 (Fig. 6e).

In addition, although the relay 28 is used in the above explanation, this relay 28 is omitted and the relay contact 40 is used.
Instead, a manual switch may be provided to allow manual operation.

Furthermore, although the warning voice is recorded on a tape recorder, the voice may also be recorded or stored on a magnetic drum, a voice synthesis circuit, or the like.

〔Effect of the invention〕

As described above, the optical beam warning device of the present invention uses a recorder that records words to warn, among a plurality of recorders installed in the area, in a warning area that has been blocked off by an intruder. You can select one and make it special to generate a warning, so you can avoid the inconvenience of the security guard having to visit for security purposes and the danger to the security guard, and it also allows the security guard to prepare the next security system. It saves time and has a great security effect, and since the warning command signal is sent along the same route as the warning light, there is no need for special wiring for warning signals, making it easier to construct and install. , there are economic advantages.

In addition, it is possible to issue a warning by pre-recording words suitable for the restricted area and playing back the recording, making it an extremely useful optical warning device that can quickly issue a warning. Can be provided.

[Brief explanation of drawings]

Figures 1 to 6 are examples of the present invention, Figure 7 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 generation. A block diagram of the device, FIG. 4 is a block diagram of the warning sound generating device, and FIGS. 5 a to 5 are 5a in FIG. 3.
Timing chart of various signals of ~5f, No. 6
Figures a to e are timing charts of output signals of each section 6a to 6e in FIG. 4. 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, 10 and 20 are cutoff area identification display devices, 11 is a speaker, 27 is an indicator lamp, and 30 is a A warning command signal generating device, 31 a pulse signal generating circuit, 40 a relay contact, 41 a warning switch, 50 a warning generating device, and 54 a recorder.

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 beam 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 receives information about the blocked area along the same route as the warning light beam. In the optical warning device, the warning device includes a warning generating device provided in each of the transmitters and receivers and having a recording means in which a warning sound is recorded in advance, and a warning device for receiving the signal light for identifying the cut-off area of the light receiver. and a warning command signal generating device that generates a warning command signal for operating a specific one of the warning command signal generating devices in accordance with the above, and the light transmitter has a signal modulated by the output signal of the warning command signal generating device. A light beam warning device, characterized in that it is configured to generate light, and one of the warning generating devices specified by the warning command signal is activated to generate a warning sound recorded in the recording means.