JPH01220092A - Trespasser alarm system - Google Patents

Abstract

PURPOSE:To speed up and ensure the confirmation of a theft occurrence place by a watchman when a theft alarm is transmitted with a receiver by attaining to totally operate the switching-over of an action condition required for a human body detector at the time of an alarm, an action confirmation and a maintenance and inspection at a receiver side. CONSTITUTION:Each of human body detectors 2a-2n can be controlled into either of the action conditions of a previously set maintenance and inspection mode, an alarm mode or an action confirmation mode by the mode changing- over operation of a mode changing-over switch 6 in a receiver 1. When a receiver action confirmation mode is set at the time of transmitting a theft alarm from a receiver 1, an action confirmation mode is detected at the human body detector side, an ordinary detection function is released at all the human body detectors 2a-2n and the lighting-up condition of an action indicator lamp is maintained at the acted human body detector. Thus, the watchman can speedily and surely confirm the theft occurrence place by investigating the lighting-up condition of the action indicator lamp.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an intruder alarm system for monitoring theft by connecting a plurality of human body detectors to a receiver.

[Prior Art] Conventionally, as this type of intruder alarm system, for example, the one shown in FIG. 3 is known.

In FIG. 3, 1 is a receiver, 2a to 2e are human body detectors installed in guarded areas, for example, in each room, and a power line 3a is connected to a power source built in the receiver 1.

3b supplies power to the human body detectors 2a to 2e.

Each of the human body detectors 2a to 2e is equipped with a sensor that detects, for example, heat rays (infrared rays) emitted from the human body, and when an intruder is detected, an alarm relay is activated to open the normally closed relay contacts 4a to 4e. ing.

From the receiver 1, there are signal lines 5a, 5 in addition to power lines 3a, 3b.
b is drawn out, and this signal line 5a.

Normally closed relay contacts 4a to 4e of the alarm relays provided in the human body detectors 2a to 2e are connected in series between the human body detectors 2a to 2e, and a monitoring loop is formed by the signal lines 5a and 5b in a steady monitoring state. Therefore, when any of the human body detectors 2a to 2e detects an intruder, a signal line loop is opened by opening the corresponding normally closed relay contact, and the receiver 1 detects the opening of this loop and issues a theft alarm. put out. Also, if the power lines 3a, 3b or the signal lines 5a, 5b are cut by an intruder, the signal lines 5a, 5b,
Since the loop is broken when the normally closed relay contact is opened due to disconnection of the wire 5b or the stoppage of operation of the human body detector, the receiver 1 can similarly detect the opening of the loop and issue a theft alarm.

Furthermore, the human body detectors 2a to 2e are provided with operation indicator lights, which turn on when an intruder is detected to prevent theft from the receiver.
'['When an operator receives a warning and goes around the site, he or she can see which human body detectors were activated.

[Problems to be Solved by the Invention] However, in such conventional intruder monitoring systems, when a theft alarm is issued from the receiver, it is necessary to inspect the scene and display whether or not the human body detector is activated. When checking from the lighting status of the lights, there is a problem that the detectors that were not working before will turn on their operation indicator lights when a human body is detected during patrolling, making it impossible to determine which detector started working first. Ta.

In order to solve this problem, we installed an operation display mechanism that mechanically reverses the operation display member when detecting an intruder and then attracts and holds it with a magnet.When patrolling, the power from the receiver is turned off and the human body detector is activated. It is possible to stop the display, but the operation display mechanism is complicated and costs increase, and there are also problems in that it is difficult to confirm the inverted state of the display color in dim light.

Furthermore, in this type of intruder warning system, an operation indicator light is turned on when a human body is detected, but this is only necessary to confirm operation during maintenance and inspection, so under normal conditions, The switch that controls whether the operation indicator light on the human body detector turns on or off was turned off. However, during maintenance and inspection, it is necessary to turn on the switch for each human body detector to make it ready for lighting, which creates a problem of complexity.

The present invention has been made in view of these conventional problems, and allows switching of the operating states required for human body detectors, such as during warning, operation confirmation, and maintenance and inspection, all by operation on the receiver side. It is an object of the present invention to provide an intruder alarm system that is simple and easy to operate.

[Means for Solving the Problems] In order to achieve this object, in the present invention, a plurality of human body detectors are connected to a power line drawn out from a receiver, and a plurality of human body detectors are connected between signal lines from the receiver. The normally closed relay contacts of alarm relays provided in each human body detector that operate when a human body is detected are connected in series, and each of the human body detectors has a detection circuit for detecting an intruder, and a detection output of the detection circuit. In an intruder alarm system that includes a comparison circuit that outputs an output when the level exceeds a predetermined level, and an alarm drive circuit that lights an operation indicator light and activates the alarm relay using the comparison output of the comparison circuit, a receiver and each The human body detector is configured as follows.

First, the receiver includes a mode switching means for switching between three modes: a maintenance inspection mode, a warning mode, and an operation confirmation mode; and outputs each mode signal to each of the human body detectors in response to mode switching by the mode switching means. mode signal output means;

On the other hand, corresponding to the receiver having such a configuration, each of the human body detectors includes a holding means for holding the comparison output of the comparison circuit; and a holding means for holding the comparison output of the comparison circuit; mode detection means; when the mode detection means detects the maintenance/inspection mode, the holding means is set to a non-holding state and the operation indicator light is enabled to be lit; when the mode detection means detects the warning mode, the holding means is held; control means for turning off the operation indicator light and turning off the operation indicator light when the operation check mode is detected, and further for setting the holding means in the holding state, enabling the operation indicator light to turn on, and stopping the normal detection function; : is provided.

[Operations] In the intruder alarm system of the present invention having such a configuration, each of the human body detectors can be set in a preset maintenance inspection mode, warning mode, or operation confirmation mode by mode switching operation on the receiver side. can be controlled to any operating state.

In particular, when a theft alarm is issued from the receiver, if you set the receiver operation confirmation mode, the operation confirmation mode will be detected on the human body detector side, and the normal detection function will be canceled on all human body detectors. At the same time, the operating human body detector maintains the holding state of the holding means and the lighting state of the operation indicator light according to the detection operation, so even if the human body detector enters the warning area of the non-operating human body detector, it will continue to operate. Since the indicator light is not lit and only the operation indicator light of the human body detector that is actually activated is lit, the location where the theft has occurred can be immediately confirmed.

In addition, operation indicator lights are turned off during warnings and maintenance inspections.
The lighting enable state can be easily controlled by setting the mode on the receiver.

[Embodiment] FIG. 1 is a block diagram showing an embodiment of the system configuration of the present invention.

In Fig. 1, 1 is a receiver, and a power supply line 3 is connected to human body detectors 2a, 2b, ... 2n installed in a restricted area
A and 3b supply power supply voltage, and normally closed relay contacts 4a to 4n provided in human body detectors 28 to 2n are loop-connected by signal lines 5a and 5b.

The receiver 1 is provided with a mode changeover switch 6 as a mode changeover means, and the illustrated changeover position "1" sets the maintenance and inspection mode, the changeover position "2" sets the warning mode, and the changeover position "3" sets the warning mode. Set the operation check mode with . The mode changeover switch 6 is connected to the human body detector 2 by the variable power supply circuit 7.
The power supply voltage for a to 2n is varied corresponding to each mode. That is, the variable power supply means 7 has a function as a mode signal output means that outputs different power supply voltages depending on the mode selected by the mode changeover switch 6.

In this embodiment, the variable power supply circuit 7 supplies 12V when the maintenance inspection mode is set, 18V when the warning mode is set, and 24V when the operation check mode is set to the human body detectors 2a to 2n.
supply to.

Furthermore, normally closed relay contacts 4 provided on the human body detectors 2a to 2n
A signal line 5a is formed by connecting a to 4n in a loop.

5b is connected to a receiving circuit 8, and the receiving circuit 8 detects a loop opening when any of the normally closed relay contacts 4a to 4n is opened, or when an intruder disconnects the signal lines 5a and 5b, and issues a burglar alarm. produces a received output for.

FIG. 2 shows a receiver 1 having the mode changeover switch 6 shown in FIG. 1 and a variable power supply circuit 7 as a mode signal output means.
It is a circuit block diagram showing one example of a detector side circuit provided in each of human body detectors 2a-2n connected to.

In FIG. 2, a detection circuit 9 for detecting an intruder is provided as a detection circuit section that operates upon receiving power supply from the receiver to terminals A and B of the human body detector 2.
For example, a circuit equipped with a sensor that detects heat rays (infrared rays) emitted from the human body or a circuit that detects the human body by transmitting and receiving ultrasonic waves is used. The detection output of the detection circuit 9 is amplified by an amplifier circuit 10 and then input to a comparison circuit 11 for identifying an intruder. A predetermined threshold level is set as a reference value in the comparison circuit 11, and when the amplified output exceeds the reference level, a comparison output that becomes H level is produced. The output of the comparison circuit 11 is connected to the base of a transistor 21 via a resistor R1, and a relay 22 having a normally closed relay contact 4 is connected to the elector side of the transistor 21.

Therefore, when a torque output due to theft detection is obtained from the comparison circuit 11, the transistor 21 is turned off and the relay 22 is turned off.
is restored and the normally closed relay contact 4 is opened.

Furthermore, the output of the comparator circuit 11 is inputted to a buffer amplifier 12 constituting a holding means via a resistor R2 and a diode D1. The buffer 1 amplifier 12 has a feedback circuit in which a resistor R3 and a diode D2 are connected in series from the output to the input, and an input resistor R4 is further connected to the input stage. The collector of the transistor 15 is connected between the resistor R3 and the diode D2 that constitute the feedback circuit, and when the transistor 15 is off, a feedback loop is formed to perform a holding operation, and when the transistor 15 is on, the feedback loop is released. Then, the holding operation is released.

The output of the buffer amplifier 12 is connected to the base of a transistor 13 via a resistor R5, and an operation indicator light 24 made of an LED is connected to the collector of the transistor 13 via a current limiting resistor R6.

On the other hand, Zener diodes ZD1 and ZD2 are connected to the input side of the constant voltage circuit 20 provided in the human body detector 2 as mode detection means for detecting each mode signal output from the receiver 1 shown in FIG. is provided. Zener diode ZD'l has, for example, a Zener voltage Vzl ='l 5V, and Zener diode ZD2, for example, has a Zener voltage VZ2 =21V. Zener diode ZD1 is connected through a resistor R6 between terminals A and B that receive a power supply voltage, and Zener diode ZD2 is connected between terminals A and B through a resistor R7.

Here, since a power supply voltage of 12V is applied when the maintenance inspection mode is set in the receiver 1, the Zener diode ZD1. Both ZD2 are off. Further, when the receiver sets the alarm mode, since a power supply voltage of 18V is supplied, only the Zener diode ZD1 is turned on. Furthermore, when the operation check mode is set on the receiver, 24
Since the power supply voltage of V is supplied, the Zener diode ZD1. Both ZD2 are turned on.

A connection point between Zener diode ZD1 and resistor R is connected to the base of transistor 14. The transistor 14 turns on and off a transistor 16 connected to the output side of the constant voltage circuit 20. That is, the resistors R8 and R9 and the transistor 14 are connected in series as a base circuit of the transistor 16, and when the transistor 14 is off, the transistor 1.6 is turned off. On the other hand, transistor 14
When turned on, base current flows through the transistor 16, turning it on. The collector output of the transistor 14 is connected to the base of a transistor 15 provided in the feedback circuit of the buffer amplifier 12 as a holding means, and when the transistor 14 is turned on, the transistor 15 is cut off, and when the transistor 14 is turned off, the transistor 15 is turned on. It becomes like this.

Resistors R10 and R11 are connected to the collector of the transistor 16, and their connection point is connected to the base of the transistor 18, and the collector of the transistor 18 is connected to the base of the transistor 13 that drives the operation indicator light 24. Further, the collector output of the transistor 14 is inputted to a buffer amplifier 19 for stopping the detection function of the human body detector 2 via a diode D3.

On the other hand, the connection point between Zener diode ZD2 and resistor R7 is connected to the base of transistor 17, and transistor 1
The collector of transistor 7 is connected to the base of transistor 18. Furthermore, the collector output of the transistor 17 is inputted to the buffer 7 amplifier 19 for stopping the detection function of the human body detector 2 via the diode D4. Diode D3 of buffer amplifier 19. The common connection side of D4 is resistor R1
2 to the ground line on the terminal B side.

The output of the buffer amplifier 19 is connected via a diode D5 between a resistor R2 provided at the output of the comparison circuit 11 and a diode D1.

Here, the embodiment shown in FIGS. 1 and 2 is equipped with a mode signal (power supply voltage) for the human body detector in the maintenance inspection mode, warning mode, and operation confirmation mode, and a buffer amplifier 12 in the human body detector 2. The retention or non-retention of the maintenance circuit, the lighting or extinguishment of the operation indicator light 24, and the function or stoppage of the detection unit are determined as shown in Table 1 below.

Furthermore, the transistor 14 in the human body detector 2 in FIG.
The relationship between the logic levels H and L according to the potential of the 0 point which is the collector output of the transistor 17 and the 0 point which is the collector output of the transistor 17 is as shown in Table 2 below for the maintenance inspection mode, warning mode and operation check mode. become.

Next, the operation of the human body detector shown in FIG. 2 will be explained.

[When setting alarm mode] When setting alarm mode on receiver 1, the above table-1
As shown in FIG. 2, a power supply voltage of 18V is supplied to the human body detector 2. In response to the supply of this 18V power supply voltage, the Zener diode ZDI becomes conductive, turning on the transistor 14. When transistor 14 is turned on, transistor 1
A base current flows through transistor 6, and transistor 16 is also turned on.

When transistor 16 turns on, Zener diode ZD
Since the transistor 17 is in the off state due to the non-conduction of the transistor 2, the transistor 18 is turned on and the transistor 13 is placed in the cutoff state. Since the light is always turned off and the operation indicator light 24 does not turn on even if an intruder is detected, the detection operation by the intruder detector 2 is not known to the intruder.

In such an operating state based on the power supply voltage of 18 V in the warning mode, the collector output of the transistor 14 is
As shown in , the collector output of transistor 17 is at L level and the collector output ■ is at H level, and the voltage between point ■ and point 0 is connected to diode D3. Since it is input to the buffer 1 amplifier 19 via the OR circuit consisting of D4, the output of the buffer amplifier 19 is at H level, and the diode D5 is placed in the cutoff state, so the comparison output of the comparison circuit 11 is directly input to the buffer amplifier. 12, and the detection function of the human body detector 2 is in a valid state. In addition, since the transistor 14 is turned on, the point ■ is at the L level, so the transistor 15 is turned off, and a feedback circuit of the buffer 7 amplifier 12 is formed, so that the holding operation is enabled.

When the comparator circuit 11 generates a torque output based on the human body detection output from the detection circuit 9 in the alert mode setting state, the relay 22 is restored by turning off the transistor 21 and the normally closed relay contact 4 is opened. At the same time, the torque output of the comparison circuit 11 is input to the buffer amplifier 12 via the resistor R2 and the diode D1, and the output of the buffer 1 amplifier 12 becomes H level, but since the transistor 13 is cut off by turning on the transistor 18, , the operation indicator light 24 does not light up. On the other hand, since the transistor 15 is in the off state, the torque output of the buffer 7 amplifier 12 is fed back to the input by the current flowing through the resistors R3, D2 and resistor R4. Even if the H level state is cut off, the feedback loop fixes the input of the buffer 7 amplifier 12 to the H level, so the torque output is maintained.

Of course, when the normally closed relay contact 4 is opened due to the restoration of the relay 22, as shown in FIG.
A theft alarm is issued on the first side.

[When setting the operation confirmation mode] - When the theft alarm is issued due to the detection of an intruder by the human body detector 2, the mode selector switch 6 of the receiver 1 is set to go to the location where the theft occurred and confirm that the human body detector 2 is activated. Sets the operation confirmation mode given by switching position "2". When the operation confirmation mode is set in this manner, a power supply voltage of 24V is supplied to the human body detector 2 as shown in Figure 1 above.

In the human body detector 2 shown in FIG. 2, which is supplied with a power supply voltage of 24 V in the operation confirmation mode, both Zener diodes ZD1 and ZD2 become conductive. When the Zener diode ZD2 becomes conductive, the transistor 17 is turned on and the transistor 18 is cut off. Since the output of the buffer amplifier 12 is held at H level in the theft detection state, the transistor 13 is turned on when the transistor 18 is turned off.
The operation indicator light 24 is turned on. At this time, since the transistor 14 is in the on state, the logic level of point ① and point 0 is at (L, L) as shown in the above-mentioned Figure 2.
■The potential of point and 0 point is connected to diode D3. The output of the buffer amplifier 19 input via D4 becomes L level, and diode D5 becomes conductive, pulling the connection point between resistor R2 and diode D1 to L level, and stopping the intruder detection function.

In other words, even if a guard enters the guarded area of the human body detector 2 in order to confirm a hot spot where a theft occurs, and a comparison output that is a trubel is obtained from the comparison circuit 11, the trubel output of the buffer 1 amplifier 19 causes the buffer amplifier to Since the comparison output to 12 is blocked, the operation indicator light 24 will not light up even if the user enters the security area of the human body detector 2 where theft detection is not performed.

On the other hand, in the human body detector 2 where the theft was detected, the operation indicator light 24 is turned on by the holding output of the buffer amplifier 12, regardless of the output of the comparison circuit 11, and as a result, the operation indicator light 24 is lit Only the operation indicator light 24 of the human body detector in which a person has been detected is in a lit state, and by checking the lighting state of the operation indicator light 24, the surveillance officer can confirm the location where the theft has occurred.

In addition, in the operation confirmation mode, when the human body detector 2 enters the restricted area where theft detection is not performed, the comparison circuit 11
The transistor 21 is turned off by the comparison output, and the normally closed relay contact 4 is opened by the restoration of the relay 22, but on the receiver side, a latched state for alarm reception has already been created based on the opening of the monitoring loop. Therefore, there is no problem even if the relay 22 is restored.

[When setting the maintenance/inspection mode] When the maintenance/inspection mode is set using the mode changeover switch 6 provided on the receiver 1, the second mode is set as shown in Table 1 above.
A power supply voltage of 12V is supplied to the human body detector 2 in the figure. In the human body detector 2 that is supplied with a power supply voltage of 12V by setting this maintenance inspection mode, Zener diodes ZD1 and ZD2 become non-conductive, and transistor 1
4, 16, 17, 18 are all off, 0 points and 0
The logic level based on the potential at the point is (H, L) as shown in Table 2 above. In addition, since the output of the constant voltage circuit 2° is supplied to the base of the transistor 15 via the resistors R8 and R9, the transistor 15 is turned on and the feedback loop of the buffer amplifier 12 is cut off. becomes a non-retained state. Of course, since the potential at the 0 point is at Trubel, the output of the buffer amplifier 19 is at Trubel, the diode D5 is rendered non-conductive, and the detection function based on the comparison circuit 11 is enabled.

Human body detector 2 based on such maintenance inspection mode settings
If, in the operating state, a pseudo detection operation is performed by entering the warning area in the area where the human body detector 2 is installed, while the comparator circuit 11 is obtaining the torque output, the buffer 7 amplifier 12 is By generating an output and turning on the transistor 13, the operation indicator lamp 24 is turned on.

At the same time, the relay 22 is restored by turning off the transistor 21, which opens the normally closed relay contact 4, and a theft alarm is issued on the receiver 1 side by maintenance inspection. If the human body detector 2 is switched to the alert mode after the maintenance inspection is completed, the alert mode can be entered without requiring any special recovery operation on the human body detector 2 side.

In the above embodiment, the mode changeover switch 6 provided in the receiver 1 allows the voltage to be set to 12V or 18V depending on each mode.
, 24V are supplied to the human body detector 2 to create control states for each mode. However, in another embodiment, the receiver 1 supplies code signals corresponding to each mode to the power supply voltage (,: Alternatively, the code signals may be transmitted in a superimposed manner, and this code signal may be decoded on the human body detector 2 side to create a control state corresponding to the decoding mode.

In the human body detector shown in FIG. 2, the power supply voltage corresponding to each mode is controlled by a Zener diode ZD1. Although ZD2 is used for detection, mode detection may be performed using a comparator instead of the Zener diode.

[Effects of the Invention] As described above, according to the present invention, all of the maintenance inspection mode, warning mode, and operation confirmation mode required for an intruder detection system can be set by the mode switching means provided on the receiver side. By simply doing this, the human body detector side can be automatically put into the operating state corresponding to each mode.

Therefore, when a theft alarm is issued by the receiver, the guard can quickly and reliably confirm the location where the theft has occurred, and
The mode setting on the receiver makes it easy to control whether the operation indicator light is turned off or turned on during warnings or maintenance inspections.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the system configuration of the present invention; FIG. 2 is a circuit block diagram showing an embodiment of the human body detector shown in FIG. 1; FIG. 3 is an explanatory diagram of a conventional system. 1: Receiver 2: Human body detectors 3a, 3b: Power lines 4.4a to 4n: Normally closed relay contacts 5a, 5b: Signal line 6: Mode selector switch 7: Variable power supply circuit (mode signal output means) 8: Receiving circuit 9: Detection circuit 10: Amplification circuit 11: Comparison circuit 12.19: Buffer amplifier 13 to 18.21: Transistor 20: Constant voltage circuit 22: Relay 24: Operation indicator (LED) ZDI, ZD2: Zener diode ( mode detection means)

Claims (1)

[Scope of Claims] 1. A plurality of human body detectors are connected to a power line drawn out from the receiver, and an alarm is provided in each of the human body detectors to be turned off when a human body is detected in a signal line from the receiver. Each of the human body detectors comprises a normally closed contact of a relay connected in series, and each of the human body detectors includes a detection circuit for detecting an intruder, a comparison circuit that outputs an output when the output of the detection circuit is equal to or higher than a predetermined level, and a detection circuit for detecting an intruder. In an intruder alarm system equipped with an alarm drive circuit that operates with a comparison output to light an operation indicator light and operate the alarm relay, the receiver is configured to have a maintenance inspection mode, a warning mode, and an operation confirmation mode. A mode switching means for switching between three modes; and a mode signal output means for outputting each mode signal to each of the human body detectors in response to mode switching by the mode switching means; each of the human body detectors is provided with: Holding means for holding the comparison output of the comparison circuit; Mode detection means for detecting each mode signal output from the mode signal output means; When the mode detection means detects the maintenance inspection mode, the holding means holds the comparison output of the comparison circuit; The means is set to a non-holding state and the operation indicator light is set to a lightable state, and when the warning mode is detected, the holding means is set to a holding state and the operation indicator light is set to an extinguished state, and furthermore, the operation confirmation mode is detected. an intruder alarm system comprising: control means for setting the holding means in a holding state, enabling the operation indicator light to be turned on, and stopping a normal detection function when the intruder alarm system is activated.