JPH07114686A - Guard system - Google Patents

Abstract

PURPOSE:To threaten an illegal trespasser and indicates an abnormal state by sounding an alarm bell by using a backup power source incorporated in the bell device when an open circuit is detected. CONSTITUTION:When it is judged from the analytic result of an abnormality signal detected by a detection sensor group A that alarming needs to be commanded, a control circuit B2 sends a bell sounding command to the bell device C through a sounding control line E2 and the bell device C having received this bell sounding command sounds the alarm bell C1 through a bell sounding control circuit C2. At this time, the electric power for sounding the alarm bell C1 is supplied from a main power circuit B3. If the illegal trespasser disconnects the bell connection line E between a guard monitor device B and the bell device C, on the other hand, an open circuit detecting device C3 incorporated in the bell connection line E operates to sound the alarm C1. At this time, the backup power source C4 in the bell device is basically used as the power source for sounding the alarm bell.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a security system for sounding an alarm bell by detecting the intrusion of a suspicious person into a room or theft of equipment in the room. More specifically, the intruder disturbs the operation of the security system. The present invention relates to a security system capable of ringing an alarm bell even when the security system is harmed for the purpose of

[0002]

2. Description of the Related Art In recent years, mechanical security has been remarkably widespread, and the target of security has been expanded to factories, offices, shops, and even ordinary households. A conventional security system of this type is shown in FIG.
As shown by, it is mainly composed of a detection sensor group a, a security monitoring device b, and an alarm bell c.

The detection sensor group a includes various sensors attached to security points such as an intrusion detection sensor attached to a door or a window, an antitheft sensor attached to a personal computer or a copying machine, and a fire detection sensor attached to a ceiling. Is. The output signals of these sensors are input to the security monitoring device b via the sensor output conductor d.

In the security monitoring device b, an I / O interface b for receiving the output signal of the detection sensor group a
1. A control circuit b2 that monitors the sensor output input through the I / O interface b1 to determine whether or not a warning signal is issued, and transforms and rectifies the power supplied from the AC power supply f for indoor distribution to provide the security. A power supply circuit b3 for supplying electric power to the respective parts of the system is built-in. Further, a bell ringing power supply line e for supplying power to the alarm bell is derived from the security monitoring device b, and a loud alarm ring c is attached to the end of the power ring e. Furthermore, when a security company is involved in this security system, a communication unit b4 that enables communication with the security company is incorporated inside the security monitoring device b, and an abnormal situation detected by the security monitoring device b is detected. Is automatically transmitted to a security company through a communication line g such as a private line or a public line.

The alarm bell c is not built in the security monitoring device b but is installed outside the security monitoring device b. This is because the security monitoring device b operates to set security conditions and start / cancel security. The alarm bell is installed in a position that is relatively easy to operate because it needs to be operated, whereas the alarm bell is a loud noise that threatens illegal trespassers and at the same time propagates the alarm sound over a wide range, so it is relatively high or in a room. This is because it is often installed outside.

In such a security system, if the detection sensor group a detects an abnormality of the object to be watched, whether this signal should be transmitted to the security monitoring device b and the signal should give an alarm. If it is determined by the control circuit b2 that it is necessary to issue an alarm, as a result, power is supplied to the alarm bell c through the bell ringing power supply line e and the alarm bell c is made to ring loudly. It has issued an alarm.

[0007]

Such a security system can exhibit extremely high reliability as long as the signal system from the detection sensor group a to the alarm bell c is operating normally. However, recent methods of illegal intruders are becoming more sophisticated, and there are some who use the method of stopping the ringing of the alarm bell c by disconnecting the bell ringing power supply line e from the security monitoring device b to the alarm bell c. Conventional security systems are unprotected against such tricks. In particular, the bell ringing power supply line e is exposed and thus easily targeted, and when the bell ringing power supply line e is disconnected, the detection sensors and the security monitoring device themselves are operating normally. This problem was a headache for security personnel because the alarm bell c did not ring.

When the communication unit b4 is built in the security monitoring device b, even if the alarm bell c does not ring,
Although the occurrence situation of the abnormal situation itself is transmitted to the security company, it takes some time for the security guards to arrive, so the importance of the threatening to the trespasser by the alarm bell c is impaired. There is no such thing. As described above, the threat from the alarm bell c is extremely important from the viewpoint of early repulsion of illegal intruders and prevention of crime. The communication unit b
Needless to say, the ringing of the alarm bell c is more important because the repulsion of the illegal intruder depends only on the ringing of the alarm bell c in the case where the alarm bell c is not incorporated.

The present invention has been made in view of the above situation, and the alarm bell is activated not only when the detection sensor group detects an abnormality but also when the connection line between the security monitoring device and the alarm bell is disconnected. It aims to provide a security system that can be activated to intimidate an illegal intruder.

[0010]

[Means for Solving the Problems] In order to solve the above problems,
As a result of intensive studies, the present inventor has obtained the following idea. That is, the alarm bell side is equipped with a device for monitoring the continuity of the connection line to the security monitoring device and a backup power supply, and when the disconnection of the connection line is detected, the backup power supply is used to ring the alarm bell. By doing so, I thought that it would be possible to deal with the disconnection of the connection line by an illegal intruder.

The security system embodying such an idea is designed to monitor one or a plurality of detection sensors installed at a security point, a sensor output lead wire for transmitting an output signal of the detection sensor, and a sensor output for warning. A security monitoring device having a control circuit for determining whether or not a signal is issued, and a main power supply circuit for transforming and rectifying the power supplied from an AC power supply for indoor distribution to supply power to each part of the device constituting the security system. A position distant from the security monitoring device, which is equipped with a bell ringing loudly and has a bell ringing control circuit for controlling ringing of the alarm bell based on a control signal issued by a control circuit in the security monitoring device. Bell device installed in
An alarm system comprising a bell connection line consisting of a power supply line for supplying electric power from a security monitoring device to a bell device and a ringing control line for transmitting an alarm bell ringing command signal issued by the security monitoring device to the bell device, wherein: In the bell device, the power supplied from the power supply line is normally stored, and when the power supply from the power supply line is interrupted, the power is supplied to each part inside the bell device instead of the main power source. A backup power source mainly composed of a secondary battery, and the continuity of the power supply line and the ringing control line that form the bell connection line are constantly monitored, and an alarm bell ringing command signal is sent to the following bell ringing control circuit when a disconnection is detected. It has a built-in disconnection detection device that emits

[0012]

In this security system, the bell device is constantly supplied with power from the security monitoring device by the power supply line,
The bell ringing command from the security monitoring device is transmitted by the ringing control line. In a normal state, the security monitoring device monitors the output signal from the detection sensor while being supplied with power from the main power supply circuit and transmits part of the power of the main power supply circuit to the bell device. On the other hand, the bell device receives power from the security monitoring device through the power supply line, continues to monitor the signal from the ring control line while charging this power to the backup power supply, and checks the conduction state of the ring control line and the power supply line. I'm watching.

When the detection sensor detects an abnormality, the control circuit in the security monitoring device analyzes and judges the signal content and then sends a bell ringing command to the bell device through the ringing control line, and receives the bell ringing command. The device rings an alarm bell via a ringing control circuit.

Further, when an illegal intruder disconnects the bell connection line between the security monitoring device and the alarm bell, the disconnection detection device incorporated in the bell device operates and activates the alarm bell. At this time, a backup power supply inside the bell device is basically used as a power supply for ringing the alarm bell. If only the ringing control line and the power supply line that make up the bell connection line are disconnected, the power supply state from the main power supply circuit is maintained, so use the backup power supply in this case. In some cases, the power for ringing the bell is received from the main power supply circuit.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing an overall outline of a security system according to the present invention. As shown in the drawing, the security system includes a sensor output conductor D for transmitting the signal outputs of the detection sensor group A, the security monitoring device B, the bell device C, and the detection sensor group A to the security monitoring device B and the security monitoring device B. From the bell device to the bell device C and the bell connection line E for transmitting the bell ringing command.

The detection sensor group A is constructed by installing a plurality of intrusion detection sensors, anti-theft sensors, fire sensors, etc., and as the sensor elements, known sensors such as pressure sensors, optical sensors, heat sensors and the like are used. used. The number of sensors may be one without using a plurality of sensors.

The security monitoring device B is an I / O interface B for receiving a transmission signal from the detection sensor group A.
1. The control circuit B2 that monitors the sensor output input through the I / O interface B1 to determine whether or not a warning signal is issued, and the power supplied from the indoor power distribution AC power source F is transformed and rectified. A main power supply circuit B3 for supplying electric power to each part of the device constituting the security system. Further, the communication unit B4 is also built-in, and is configured so that the occurrence of an abnormal situation can be automatically notified to a security company through a communication line G such as a private line or a public line. The communication unit B4 may not be provided.

From the security monitoring device B, the main power circuit B
Bell connection line that bundles a power supply line E1 for supplying the power of 3 to the remotely arranged bell device C and a ringing control line E2 for transmitting a bell ringing command issued by the control circuit B2 to the bell device C E has been derived. The wiring of the bell connection line E may be arranged in the same manner as the bell ringing power supply line in the conventional apparatus, and it is not necessary to make the bell connection line E particularly conspicuous. Of course, the bell connection line E may be intentionally wired so as to invite a disconnecting action by an illegal intruder.

The bell device C is an alarm bell C1 that makes a loud sound.
Bell ringing control circuit C for controlling ringing of alarm bell C1 in response to a control signal generated by control circuit B2 in security monitoring device B
2. It is mainly composed of a disconnection detection device C3 for monitoring the conduction state of the bell connection line E and a backup power supply C4. As shown in FIG. 2, the specific assembling form is such that the above-mentioned device groups are incorporated on a single substrate C5 and a cover C
It is a very compact structure with 6 covered, and in appearance,
It is the same as the conventional alarm bell.

The bell ringing control circuit C2 comprises a drive circuit C21 for the alarm bell C1 and a timer control circuit C22 for controlling the ringing time of the bell.

The backup power source C4 is mainly composed of a secondary battery such as a lithium battery or a nickel-cadmium battery, and is normally charged by receiving power from the power supply line E1. On the other hand, the power source from the security monitoring device B is supplied. When the power supply is cut off, it has a function of supplying power to each part in the bell device C in place of the main power supply circuit B3 in the security monitoring device B. The above function can be realized only by connecting the power supply line E1 and the backup power source C4 in parallel.
A switching circuit interlocking with the disconnection detection device C3 may be provided between the backup power supply C1 and the backup power supply C4 to automatically switch the power supply in accordance with the operating state of the disconnection detection circuit C3. Further, it is preferable to provide a protection circuit between the power supply line E1 and the backup power supply C4 to prevent the backup power supply C4 from being overcharged.

The disconnection detection device C3 is composed of a power supply line disconnection detection device C31 and a ringing control line disconnection detection device C32, and both disconnection detection devices constantly monitor the conduction state of each connection line. , When a disconnection is detected, a bell ringing command is issued to the following bell ringing control circuit C2.

Various concrete forms of the disconnection detecting device C3 can be used. For example, as the ringing control line disconnection detection device C32, several hundred μ apart from the bell ringing command signal
A weak current of about 1 mA to 1 mA is constantly applied to the ringing control line E2, a change in this weak current is converted into a voltage change and detected, and if the detected voltage is higher than a threshold value, the conduction state is normal. On the other hand, if it is low, it can be determined that the wire is broken.

Further, the power supply line disconnection detecting device C31 constantly monitors the terminal voltage of the power supply line E1, and if this terminal voltage is higher than the threshold value, it is judged that the conduction state is normal, while if it is low, it is judged that the circuit is broken. What can be done can be adopted.

The operation mode of the present security system having such a configuration is as follows. In the normal state, the security monitoring device B monitors the output signal from the detection sensor group A while receiving the power supply from the main power supply circuit and the main power supply circuit B3.
Part of the electric power is transmitted to the bell device C. On the other hand, the bell device C receives power from the security monitoring device B through the power supply line E1 and continues to monitor the signal from the ringing control line E2 while charging the backup power source C4 with this power, and the ringing control line E2 and power The conduction state of the supply line E1 is monitored.

When the detection sensor group A detects an abnormality, the control circuit B2 in the security monitoring device B analyzes and judges the signal content. For example, even when the detection sensor group A detects an intruder into the room, the intruder is not an illegal intruder,
When the person has permission to enter the room, the bell ringing command is controlled not to be issued. Whether it is an illegal intruder or not can be discriminated by, for example, checking whether or not a valid ID card is inserted into a card reader (not shown) installed at the entrance. The control circuit B2 also has a function of ignoring noise included in the output signals from the detection sensor group A and weak changes within the allowable range. The control circuit B2 also has a function of issuing a bell ringing command when the sensor output conductor D is disconnected by an illegal intruder.

As a result of analyzing the abnormal signal detected by the detection sensor group A, when it is determined that the alarm is issued, the control circuit B2 sends a bell ringing command to the bell device C through the ringing control line E2, Bell device C that received the ringing command
Causes the alarm bell C1 to ring via the bell ringing control circuit C2. The power for ringing the alarm bell C1 at this time is supplied from the main power supply circuit B3.

On the other hand, when the illegal intruder disconnects the bell connection line E between the security monitoring device B and the bell device C,
The disconnection detection device C3 built in the bell connection line E operates to activate the alarm bell C1. At this time, the backup power supply C4 inside the bell device is basically used as a power supply for ringing the alarm bell. If only the ringing control line E2 of the ringing control line E2 and the power supply line E1 configuring the bell connection line E is disconnected, the main power supply circuit B3
The power supply state from the main power supply circuit B3 is maintained without using the backup power supply C4 in this case.
You can receive the power for ringing the bell from. Further, the power supply line E1 is simply provided without interposing a switching circuit between the power supply line E1 and the backup power supply C4.
When the backup power source C4 and the backup power source C4 are connected in parallel and the power is always supplied through the backup power source C4, it is not necessary to pay attention to the power supply source, and the alarm bell C1 is activated by the power supplied through the backup power source C4.

[0029]

According to the security system of the present invention, a backup power source is built into the bell device, and a disconnection detecting device for monitoring the continuity of the bell connection line is provided inside the bell device to detect the conventional system. In addition to detecting abnormalities by the sensor group, disconnection detection is also performed, and when a disconnection is detected, the backup power supply built into the bell device is used to ring the alarm bell, so an illegal intruder disconnects the bell connection line. Even in the case of doing so, it is possible to ring the alarm bell loudly, intimidate illegal trespassers, and notify the guards and neighboring residents of abnormal situations. Further, since this security system constantly monitors the conduction state of the bell connection line, it is easy to grasp the status of whether the entire security system is operating normally.

[Brief description of drawings]

FIG. 1 is a block diagram showing an overall outline of a security system according to the present invention.

FIG. 2 is an exploded perspective view showing an assembled form of the bell device.

FIG. 3 is a block diagram showing an overall outline of a conventional security system.

[Explanation of symbols]

A detection sensor group B security monitoring device B1 I / O interface B2 control circuit B3 main power supply circuit B4 communication unit C bell device C1 alarm bell C2 bell ringing control circuit C21 drive circuit C22 timer control circuit C3 disconnection detection device C31 power supply line disconnection Detector C32 Ring control line disconnection detector C4 Backup power supply C5 Board C6 Cover D Sensor output conductor E Bell connection line E1 Power supply line E2 Ring control line F Indoor AC power supply G Communication line a Detection sensor group b Security monitoring device b1 I / O interface b2 control circuit b3 power supply circuit b4 communication unit c alarm bell d sensor output lead wire e bell ringing power supply line f indoor power distribution A
C power supply g communication line

Claims (1)

[Claims] 1. A single or a plurality of detection sensors installed at a warning location, a sensor output conductor for transmitting an output signal of the detection sensor, and a control circuit for monitoring the sensor output to determine whether or not a warning signal is issued. And a security monitoring device having a main power supply circuit for transforming and rectifying the power supplied from the AC power supply for indoor distribution to supply power to each part of the security system, and a warning bell that rings loudly, A bell device having a bell ringing control circuit for controlling ringing of an alarm bell based on a control signal generated by a control circuit in the security monitoring device, the bell device being installed at a position distant from the security monitoring device; A bell connection line consisting of a power supply line for supplying power to the bell device from the device and a ringing control line for transmitting an alarm bell ringing command signal issued by the security monitoring device to the bell device, or In the bell device, electric power supplied from the power supply line is normally stored in the bell device, and when the power supply from the power supply line is interrupted, the bell device replaces the main power supply. A backup power supply mainly composed of a secondary battery that supplies power to each part inside,
A disconnection detection device that constantly monitors the conduction state of the power supply line and the ringing control line that form the bell connection line and that issues a warning bell ringing command signal to the following bell ringing control circuit when a disconnection is detected, A security system characterized by that.