JPH0447875B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an infrared warning device, and an object thereof is to eliminate all false alarms from the warning device and obtain a highly reliable warning device.

As a conventionally known infrared warning device, a plurality of pairs of transmitters that emit infrared rays and receivers that receive the infrared rays are arranged in parallel, facing each other, and a warning range close to a fence-like plane is covered with a plurality of infrared rays. There is something that has been formed.

However, such infrared warning devices issue an alarm when only one infrared ray is blocked, and can be affected by small animals, birds, leaves, etc. other than intruders, for example.

Therefore, the light-shielding response speed of the receiver was made relatively slow, ranging from several tens of milliseconds to several hundred milliseconds, to reduce false alarms.

However, there are various factors that can cause false alarms, such as when a small animal stops in a state that blocks infrared light,
When a bird flies down in a direction parallel to the optical axis of the infrared rays, the infrared rays are blocked faster than the light blocking response speed, causing false alarms.

Furthermore, if the light shielding response speed was too slow, if an intruder ran and passed through the warning range, the alarm would not be issued because humans run at a speed of about 7 to 8 m/sec.

In this way, conventional warning devices were used with the light shielding response speed set to an appropriate value, but as described above, false alarms could not be avoided.

In order to solve the above problems, the present invention provides a device that reduces the probability of false alarms by issuing an alarm when multiple infrared rays are blocked, depending on the location and situation where the warning device is installed. The purpose is to

Furthermore, the present invention provides a more reliable alarm device by making it possible to set an alarm to be generated whenever infrared rays at a specific height are blocked depending on the situation. purpose.

In order to achieve the above object, the first invention provides an infrared warning system in which a plurality of sets of transmitters that emit infrared rays and receivers that receive the infrared rays are arranged in parallel, and a plurality of infrared rays are used as security lines. The device includes a plurality of setting means for setting different numbers of cordon lines to be cut off, and a means for detecting that the number of cordon lines set by the setting means has been cut at the same time, This is an infrared warning device that generates an alarm when lines are simultaneously interrupted.

Further, the second invention provides an infrared warning device in which a plurality of sets of transmitters that emit infrared rays and receivers that receive the infrared rays are arranged in parallel, and a plurality of infrared rays are used as security lines, and different cutoff warnings are provided. A plurality of setting means for setting the number of lines, a means for specifying a specific cordon, a means for detecting that the number of cordon lines set by the above setting means are simultaneously cut off, and a means for detecting that the number of cordons set by the above setting means are simultaneously interrupted; The infrared warning device is equipped with a circuit for detecting that a set number of cordon lines are interrupted, and generates different alarms depending on whether a set number of cordon lines are simultaneously interrupted or a designated cordon line is interrupted. be.

The present invention will be explained below based on embodiments shown in the drawings.

In Figure 1, 1 is an oscillator that selectively oscillates clock pulses in the range of several kHz to several 100 kHz, and 2 is an oscillator that adds and calculates the clock pulses from oscillator 1 one by one, resets it to a predetermined value of n+1 or more, and repeats counting. 10 is a light transmitter that emits pulsed infrared rays; 11 is a light receiving section that receives the infrared rays from the light transmitter, and when the infrared rays are blocked, it outputs an H level signal. Occur. 3 is a binary number generated from the counter 2, and a predetermined number of input signals from the light receiver 11 is (4-1, 4-2, 4-3), (4-4, 4).
-5,4-6)...(4-n-2,4-n-1,4
-n), 5 is an AND circuit, and 6 counts the output of the AND circuit 5, while the reset signal output from the counter 2,
That is, for example, after selecting a predetermined number of output signals (4-n-2, 4-n-1, 4-n) of the light receiving section 11, the counter 7 is reset.
A comparator that compares the output signal from the digital switch 8 with the value set by the digital switch 8 and outputs it under certain conditions. 9 is a timer that holds the output of the comparator 7 for a certain period of time. Note that the required number of comparators 7, digital switches 8, and timers 9 are provided in parallel. In the figure, each is shown with a suffix.

In the circuit as described above, first, the clock pulses of the oscillator 1 are counted by the counter 2, and the output to the multiplexer 3 is added by one for each clock pulse, and is accumulated in units of a predetermined number. As a result, the multiplexer 3 collectively and sequentially cyclically selects the input signals from the light receiving section 11 in accordance with a predetermined number of clock pulses from the counter 2.
For example, when the output of the counter 2 is n, the multiplexer 3 selects the input signal 4-n, but the presence or absence of such a single-signal input signal does not affect the output of the multiplexer 3. Furthermore, if infrared rays are not blocked at all, the input signals 4 of the multiplexer 3 are all at L level, so no signal is generated from the multiplexer 3 and no signal is applied to the AND circuit 5. Therefore, the circuits after the AND circuit 5 do not operate and do not issue an alarm.

Next, when the infrared rays are blocked by a shielding object,
Input signals for a predetermined number of corresponding light receiving sections 11, for example (4-n-2, 4-n-1, 4-n)
The multiplexer 3 outputs an output signal of H level only when both of them reach H level.

Therefore, when the multiplexer 3 sequentially selects the input signals of the light receiving section 11 in units of a predetermined number and collectively selects the H level signals, the multiplexer 3
The output also becomes H level, and one system of signals is input to the AND circuit 5. On the other hand, the clock pulses oscillated by the oscillator 1 emit H level at regular intervals, and these pulses are synchronized with the sequential accumulation of a predetermined number of output signals of the light receiving section 11. The last one of these is determined, and an H level output is applied from the multiplexer 3 to the AND circuit 5. At the same time, an H level signal is also applied from the oscillator 1, so a signal is output from the AND circuit 5 and applied to the counter 6. be done. Then, the counter 6 counts the H level input signals, and the counted value is sent to all the comparators 7. At that time,
Each comparator 7 compares the input count value with the value set by the corresponding digital switch 8, and when the two do not match, the comparator 7
No signal is output from. Now, suppose that the set value of digital switch 8-1 is the value of comparator 7-1.
When the input count value matches the input count value, an alarm signal is output from the comparator 7-1. The alarm signal is held by a timer 9 for a certain period of time.
That is, when the number of H level signals from the light receiving section 11 is equal to the value set by the digital switch 8,
A corresponding alarm will be issued.

Furthermore, each digital switch 8-1 to 8-m sets a numerical value in advance, and each comparator 7-1 to 7-m
By making each correspond to the respective numerical values and changing the accumulation pitch of the multiplexer 3, the predetermined number of infrared rays can be changed and the detection pitch can be varied. It can be reduced as much as possible.

Therefore multiplexer 3 and comparator 7-
1 to 7-m are configured as means for setting a plurality of infrared rays, and a multiplexer 3 and an AND circuit 5 are configured as means for detecting that a plurality of infrared rays are blocked approximately simultaneously over time.

Note that as the comparator 7, a comparator that generates an output signal when the input data is less than or above the set value of the digital switch 8 may be used.

By the way, in the case of Figure 1, the detection pitch can be varied by sequentially specifying the number of blocked infrared rays that should issue a warning, but the detection range cannot be changed. Depending on the installation location, it may not be possible to perform appropriate warning detection. There is. In order to solve this problem, it is possible to add a means for variably setting the detection range as shown in FIG. good.

In FIG. 2, the range in which a predetermined number of infrared rays are circulated can be limited, and an alarm is issued when a predetermined number of infrared rays are interrupted within the limited detection range.

In the figure, 21, 22, 23 are the oscillator 1 of FIG.
This corresponds to the counter 2 and the multiplexer 3, respectively. 25 is a comparator that outputs a signal when two inputs match, 26 is a digital switch, 27 is a 3-input AND circuit, and 28 is a timer circuit.

Now, specify a predetermined number of units of infrared rays with the digital switch 26, and select the detection range set by the multiplexer 23 [for example, the receivers 11-1, 11-
2, 11-3 to 11-4, 11-5, 11-6]
When a predetermined number of infrared rays are not blocked within the three-channel input AND circuit 27, the output from the multiplexer 23 is at the L level, so no signal is output from the three-system input AND circuit 27, and no alarm is generated. Conversely, when a predetermined number of infrared rays are blocked within the set detection range, the multiplexer 23 emits an H level signal. On the other hand, the comparator 25 generates a signal because the input from the counter 22 and the input from the digital switch 26 match. Also, oscillator 2
1, a signal is generated in synchronization with the multiplexer 23 selecting the last output signal of a predetermined number of units of the light receiving section 11. Therefore,
All three inputs of the AND circuit 27 become H level, and a signal is generated from the AND circuit 27 and the timer circuit 28
An alarm is issued via. After that, the multiplexer 23 selects the next predetermined number of infrared input signals, for example, the receivers 11-4, 11-5, 11-6 after passing through the receivers 11-1, 11-2, 11-3, Since the input from the counter 22 to the comparator 25 and the input from the digital switch 26 no longer match, no signal is output from the comparator 25. Therefore, there is no output from the AND circuit 27. However, the alarm detected immediately before is held by the timer circuit 28 so as to sound for a certain period of time.

In this way, it is possible to limit the detection range and issue an alarm when a predetermined number of circulated infrared rays are blocked.

Furthermore, if a comparator 25 that generates an output when the input data is equal to or less than the set value of the digital switch 26 is used, the number of infrared rays equal to or greater than the number group of the set value,
Alternatively, it is also possible to set a predetermined number of infrared rays that are less than or equal to the number group of the set value, and generate an alarm when these are blocked.

Also in this case, the multiplexer 23 and the comparator 25 serve as means for setting a plurality of infrared rays, and the multiplexer 23 and the AND circuit 27 serve as means for setting a plurality of infrared rays.
It is configured as means for detecting that a plurality of infrared rays are blocked approximately simultaneously over time.

Therefore, according to the present invention, regardless of the installation location of the warning device, the detection range can be arbitrarily set to perform warning detection in a predetermined number of infrared units, or the detection pitch can be varied to prevent malfunction of warning detection. can be prevented. This allows you to adjust the warning range according to the installation location, such as guarding between barbed wire, guarding places near structures where there is a possibility of jumping in, or guarding places where it is possible to crawl into the area. This will enable effective warnings to be issued.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and Figure 1 shows a circuit that issues an alarm when multiple infrared rays are blocked simultaneously;
FIG. 2 shows a circuit that can limit the range in which a predetermined number of infrared rays are circulated and perform warning detection within the limited detection range. In the figure, 1 and 21 are clock oscillators, 2 and 22 are counters, 3 and 23 are multiplexers, and 5 and 27.
is an AND circuit, 6 is a counter (second counter),
7 is a comparator, 8 and 26 are digital switches, 9 and 28 are timer circuits, 10 is a light emitter, 1
1 is a light receiver, and 25 is a comparator.

Claims (1)

[Scope of Claims] 1. An infrared warning device in which a plurality of sets of transmitters that emit infrared rays and receivers that receive the infrared rays are arranged in parallel, and a plurality of infrared rays are used as warning lines,
It has a plurality of setting means for setting different numbers of cordon lines to be cut off, and a means for detecting that the number of cordon lines set by the setting means has been cut off at the same time. An infrared warning device that generates an alarm in response to a blockage. 2. In an infrared warning device in which a plurality of sets of transmitters that emit infrared rays and receivers that receive the infrared rays are arranged in parallel, and a plurality of infrared rays are used as warning lines,
A plurality of setting means for setting different numbers of cordon lines, means for specifying a specific cordon line, means for detecting that the number of cordon lines set by the setting means are simultaneously cut off, and the specifying means. The infrared rays have an infrared circuit that detects when the designated cordon lines are cut off, and generates different alarms depending on whether a set number of cordon lines are simultaneously cut off or when a designated cordon line is cut off. Warning device. 3. The infrared warning device according to claim 1, comprising a pulse oscillator that generates a pulse signal at a predetermined repetition frequency, and a pulse of the oscillator that is repeated up to a predetermined value that is larger than the number of pairs of the light transmitter and light receiver. a first counter for counting; a multiplexer for sequentially selecting outputs from the light receiver based on the output of the first counter; an AND circuit receiving the output of the multiplexer and the pulse; and an output from the AND circuit. Count the pulses and
a second counter that is reset by a reset signal from the counter; a plurality of comparators commonly connected to the output of the second counter; and a numerical value setting digital switch connected to each comparator, respectively; An infrared warning device characterized in that different warning signals are obtained from the outputs of the respective comparators. 4. The infrared warning device according to claim 2, further comprising a pulse oscillator that generates a pulse signal at a predetermined repetition frequency, and a pulse oscillator that repeats the pulses of the oscillator up to a predetermined value that is larger than the number of pairs of the light transmitter and light receiver. a first counter for counting; a multiplexer for sequentially selecting outputs from the light receiver based on the output of the first counter; an AND circuit receiving the output of the multiplexer and the pulse; and an output from the AND circuit. Count the pulses and
a second counter that is reset by a reset signal from the counter; a plurality of first comparators commonly connected to the output of the second counter; and a numerical value setting device connected to each of the first comparators. a first digital switch, a second digital switch, a second comparator for comparing the set value of the second digital switch and the first counter output, the oscillator output, the multiplexer output and the 3 of the second comparator output
An infrared warning device comprising a 3-input AND circuit having one input, and outputting the first comparator output and the 3-input AND circuit output as different alarm signals.