JP2916696B2 - Security human body detector - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an improvement in a security human body detector.

[Prior art] Recently, a security human body detector is installed at an entrance, etc., and when this detector detects a human body, an alarm signal is transmitted to a separately installed security receiver to make an alarm notification, and Security systems have been developed and used to prevent intrusion into such devices.

FIG. 3 shows a schematic configuration of a security human body detector 100 used in such a security system, which includes a human body detection sensor 101 such as a pyroelectric element for detecting heat rays radiated from the human body, and a human body detection sensor 101. A detection signal amplification unit 102 that amplifies a detection signal of the detection sensor 101 and a signal reception processing unit that performs signal processing on the detection signal of the detection signal amplification unit 102 to determine whether or not there is an alarm, and that the security reception is separately provided via the signal line 1. A signal processing unit 103 for sending an alarm signal to a device (not shown), and an alarm display unit 104 for holding the alarm signal transmitted from the signal processing unit 103 and lighting and holding an alarm indicator lamp 104a. Have.

When an alarm signal (a signal that decreases to an L level at the time of alarm generation) is input from the signal processing unit 103, the alarm display unit 104 turns on the transistor Q101, thereby turning on the transistor Q1.
Since a self-holding circuit is formed to make the conductive states 00 and facilitate the conductive state with each other, once the alarm signal is input to the alarm display unit 104, the alarm display lamp 104a is turned on and held. I have. (The capacitor C100 prevents the transistors Q100 and Q101 from performing a holding operation due to pulse noise.) Therefore, even in a security system in which a large number of human body detectors 100 for security are installed, each of the detectors 100 protects the human body. When an alarm is detected, the alarm indicator light stays on, and the
100 can be identified immediately.

However, in such a security human body detector 100, when an alarm is issued by a security receiver, while searching for the security human body detector 100 that is the source of the alarm, the detection of the other detectors 100 is performed. In many cases, an alarm is issued by intruding into the area, and the alarm indicator 104a is lit, causing the alarm
There was an inconvenience that judged it as 100.

As a countermeasure for such a problem, the security receiver side is provided with a warning indicator light control function, each detector side is provided with a display memory, and a memory control signal is transmitted from the security receiver side to the detector side. Therefore, a security system has been developed in which the presence or absence of a warning state is displayed with a warning indicator according to the stored contents of the display memory.However, such a security receiver and each detector are special, so they are usually used. When the system is configured in combination with the security receiver and the detector described above, the alarm display lamp control function cannot be used, and improvement has been desired.

The human body detection sensor used for the security human body detector is
A device that detects heat rays emitted from the human body using a pyroelectric element, a device that detects ultrasonic waves reflected back from the human body, or a reflected wave generated by moving a human body by reflecting microwave band telephone signals to the human body There is a method of detecting a human body by a change in wavelength due to the Doppler effect. In either case, the detection signal of the human body detection sensor 101 is used as a detection signal as shown in FIG. Processing such as amplification is performed by the amplifier 102, and the detected signal level is compared with the reference level by the comparator CMP of the signal processing unit 103.
Compared with Er (obtained by dividing the power supply voltage with resistors R1 and R2, etc.), when the detection signal level exceeds the reference level ES2, it is determined that human body detection has been performed and an alarm signal is sent. It is customary.

FIG. 5 shows the alarm determination level in the signal processing unit 103 with respect to the detection signal output from the detection signal amplification unit 102. In the period T1, since no human body exists in the detection area of the detection sensor 101, Although a low-level noise signal is output, the amplitude level of the detection signal increases when a human body is detected in the period T2, so an alarm signal is output when the maximum value of this amplitude exceeds the reference level ES2 Have been to be. In addition, as shown in the figure, in addition to the reference level ES2, a window comparator provided with another reference level ES1 for detecting a low voltage side of the amplitude level of the detection signal is configured. Reference levels ES1 and ES2
It is also possible to adopt a configuration in which it is determined that a human body has been detected when the value exceeds the range.

However, in a security human body detector with such a configuration,
An abnormality occurs in internal circuits such as the human body detection sensor 101 and the detection signal amplification unit 102, and the output level of the detection signal becomes the reference level.
Even if it increases within the range not exceeding ES1 and ES2, the signal processing unit 103
Therefore, since the normal human body detection operation is hindered and left unchecked, the reliability of the system is reduced.

[Problem to be Solved by the Invention] The present invention proposed in view of the above situation is that when a crime prevention human body detector detects a human body and issues an alarm, the detector of the alarm source sends a signal to another detector. It is an object of the present invention to provide a crime prevention human body detector in which a display prohibition signal is transmitted to prevent an alarm display from being performed, thereby enabling the security human body detector of the alarm source to be easily specified. .

Means for Solving the Problems According to the first aspect of the present invention, which is proposed to achieve the above object, when an alarm is determined based on a detection signal output from a human body detection sensor, an alarm signal is issued. While simultaneously outputting a display inhibition signal to another detector, and when a display inhibition signal is transmitted from the other detector side, a signal holding control circuit section for inhibiting the input of the alarm signal, And a warning indicator light that lights up in response to the holding signal of the signal holding control circuit unit.

According to a second aspect of the present invention, in addition to the configuration of the first aspect, a test switch for allowing the alarm indicator lamp to light even when a display inhibition signal is being input to the signal holding control circuit unit. The configuration is added.

[Operation] According to the first aspect of the present invention, when a human body is detected by the human body detection sensor and an alarm signal is output, the alarm signal is held by the signal holding control circuit unit, and the alarm is generated by the held signal. The indicator lamp is driven to be lit, and a display prohibition signal is output from the signal holding control circuit unit to prohibit the alarm display on the other security human body detectors.

According to the second aspect of the present invention, even when a display inhibition signal is input to the signal holding control circuit unit, when a test switch is operated, a human body detection sensor detects that a human body has been detected, and a warning indicator lamp. Lights up.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows an example of the internal configuration of the human body detector 1 for crime prevention according to the present invention described in claim 1, and the same parts as those of the conventional detector are denoted by the same reference numerals and description thereof is omitted. .

In the figure, reference numeral 10 denotes a signal holding control circuit, which is an AND circuit.
An AND flip-flop is provided with AND1 (hereinafter, described as AND1), OR circuits NOR1, NOR2 (hereinafter, described as NOR1 and NO2), and a reset switch SW1 (momentary switch). L1 is a warning indicator light, SW2 is a test switch (corresponding to claim 2), and 1a is a display control terminal for sending a display prohibition signal to another human body detector 1 for crime prevention.

The operation of such a security human body detector 1 will be described.
When the signal processing unit 103 does not output the alarm signal, one of the input terminals of AND1 of the signal holding control circuit unit 10 is at the “L” level, so that the output is also at the “L” level. When the reset switch SW1 is operated in this state, one input terminal of the NOR2 is pulled up to the “H” level only during the operation, and the output of the NOR1 is set to “H” by the operation of the RS flip-flop by the combination of the NOR1 and the NOR2. Level, NOR2
Becomes "L" level, and this level is maintained even when the operation of the reset switch SW1 is released. Therefore, NOR1
Is connected to the display control terminal 1a, and the display inhibit signal is not output at the "H" level.

After the reset operation is completed and the monitoring state is entered, when the human body is detected by the human body detection sensor 101 and the alarm is determined by the signal processing unit 103, an "H" level alarm signal is input to one input terminal of AND1. Is input, and the output of AND1 becomes “H” level. As a result, one input terminal of NOR1 becomes "H" level, and the operation of the RS flip-flop inverts the output of NOR1 to "L" level and the output of NOR2 to "H" level. This "H" level output of NOR2 is a diode
The transistor Q1 is turned on through D1 to turn on the alarm indicator L1. Also, the output of NOR1 at "L" level is
Is applied to one of the input terminals of AND1 via, so that the alarm signal output from the signal processing unit 103 is prohibited from being input to NOR1 via AND1, and the "L" level signal is output from the display control terminal 1a. Outputs display inhibit signal.

On the other hand, when the resetting operation of the security human body detector 1 is completed and the monitoring state is entered, when a display inhibition signal is input from another security human body detector 1 to the display control terminal 1a, the inhibition signal becomes AND1. Of the signal processing circuit 10
Even if the alarm signal is output from 3, the output of AND1 remains at the "L" level, and the lighting display of the alarm indicator L1 is prohibited.

As described above, in the crime prevention human body detector 1 of the present invention, the alarm indicator L1 of only the alarm detector 1 is turned on and held, and at the same time, the alarm indicator L1 of the other detector 1 is prohibited from being turned on. Therefore, when an alarm is issued on the security receiver (not shown) side, it is possible to easily find the detector that has issued the alarm, and to immediately take appropriate measures.

By the way, in the case where the function of outputting the above-mentioned display prohibition signal is added to the security human body detector 1, when performing an operation test of many detectors 1 at the time of installation of the security system, one detector 1 is used. When the alarm is issued, the alarm display of the other detectors 1 is prohibited, so that it is difficult to confirm the operation state and the efficiency of the operation test is reduced.

In order to avoid such inconvenience, in the present invention, the alarm signal output from the signal processing unit 103 is not passed through the signal holding control circuit unit 10 without passing through the transistor Q1 for driving the alarm indicator light L1.
A test switch SW2 for bypassing is provided on the base side of the sensor (corresponding to claim 2). When this test switch SW2 is operated, a display inhibition signal is input from another detector 1 to the display control terminal 1a. Even if the alarm signal is output, the alarm indicator L1 can be turned on in response to the output of the alarm signal, and the efficiency of the operation test can be improved.

In this embodiment, the test switch SW2 is manually operated. However, for example, the test switch is operated in conjunction with a cover attached to the detector 1, and
It is also possible to adopt a configuration in which the operation of the test switch is automatically released after a predetermined time elapses, so that the efficiency of the operation test can be further improved.

FIG. 2 shows an example of the configuration of a security system using the above-described human body detector 1 for security, and the same portions are denoted by the same reference numerals and description thereof will be omitted.

According to the first aspect of the present invention, when a human body is detected, the alarm indicator lamp is turned on and the alarm indicator lamps of other detectors are prohibited from being turned on. This makes it possible to easily find a detector, to take quick action, and to provide a security human body detector with improved reliability.

According to the second aspect of the present invention, in addition to the effect of the first aspect, even when the display inhibition signal is input, the alarm display can be performed by operating the test switch. It is possible to provide a crime prevention human body detector with an improved operation test efficiency.

[Brief description of the drawings]

FIG. 1 is a circuit diagram of a main part of a human body detector for crime prevention according to the first and second aspects of the present invention, FIG. 2 is a structural example diagram of a security system using the same, and FIG. FIG. 4 is an explanatory diagram of the operation of the alarm display in the human body detector, FIG. 4 is an explanatory diagram of the operation of the signal processing unit of the conventional security human body detector, and FIG. 5 is an explanatory diagram of the alarm discrimination level. [Explanation of Signs] 1… Security human body detector 3… Security receiver 10 …… Signal holding control circuit section 101 …… Human body detection sensor L1 …… Indicator lamp SW2 …… Test switch

Claims (2)

(57) [Claims] When a human body is detected by a human body detection sensor, an alarm signal is output to a separately installed security receiver and an alarm is issued. When an alarm signal is output accordingly, the display inhibition signal is output to another detector while holding the alarm signal, and when the display inhibition signal is transmitted from another detector, A crime prevention human body detector, comprising: a signal holding control circuit for prohibiting the input of an alarm signal; and an alarm indicator light for lighting upon receiving a signal held by the signal holding control circuit. 2. The apparatus according to claim 1, further comprising a test switch for allowing the alarm indicator lamp to be turned on even when a display inhibition signal is being input to the signal holding control circuit unit. Security human body detector.