JPH0721484A - Heat ray sensor and burglar prevension alarming sensor - Google Patents

Abstract

PURPOSE:To simply start the operation checking processing of a heat ray sensor at required time. CONSTITUTION:When a switch 14 on a controller 12 is depressed, a power supply device 13 temporarily stops power supply to the heat ray sensor 1 and then supplies power again. When power supply is turned on, a control device 7 in the sensor 1 starts operation checking processing, and when normal operation is confirmed, flashes a display element 4 for a prescribed time at a prescribed interval. At the time of detecting abnormality, the element 4 is continuously flashed at the prescribed interval. Thereby a field worker can check the normality or abnormality of the sensor 1 by observing the flashing state of the element 1. When a monitoring loop is opened, a control circuit 21 in the controller 12 judges which heat ray sensor 1 in the loop is failed and displays the judged result.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an operation confirmation function of a heat ray sensor and a crime prevention alarm system using the heat ray sensor having an operation confirmation function.

[0002]

2. Description of the Related Art A heat ray sensor for detecting a heat ray radiated from a human body is widely used in a crime prevention warning system or the like for detecting an intruder. In the heat ray sensor, it is used as a pyroelectric element. A function called a self-diagnosis function or an operation confirmation function for confirming whether or not the circuit is operating normally (hereinafter, such a function is generically referred to as an operation confirmation function in this specification) Is usually installed.

FIG. 3 is a diagram showing a schematic circuit configuration of a heat ray sensor 1 having an operation confirmation function and a configuration example of a crime prevention alarm system using the heat ray sensor 1. In the figure, 5 is a pyroelectric element, and 6 is Signal processing circuit, 7 control circuit, 8 heater,
9 is a heater driving unit, 10 is a DIP switch, 11 is a power line, 12 is a controller, R is a relay, S ₁ and S ₂
Indicates a signal terminal, and T ₁ and T ₂ indicate power supply terminals. In FIG. 3, only one circuit configuration of the heat ray sensor 1 is shown as a representative. Further, the focusing optical system, the cover, etc. are omitted.
The same applies hereinafter.

In FIG. 3, a controller 12 is arranged in a security room or the like, and has a plurality of heat ray sensors 1
Are connected in series. This forms one monitoring loop. Although only one monitoring loop is shown in FIG. 3, a plurality of monitoring loops can be formed in the controller 12.

A power supply line 11 from a power supply device (not shown) is connected to the power supply terminals T ₁ and T ₂ of the heat ray sensor 1, and a predetermined power supply voltage is supplied to the internal circuit by the power supply line 11. There is.

The output signal of the pyroelectric element 5 is input to the signal processing circuit 6 and subjected to predetermined processing such as amplification and level comparison with a predetermined threshold value. Then, when the level of the input signal is equal to or higher than the threshold value, the signal processing circuit 6 outputs an alarm signal indicating that a human is detected to the control circuit 7.

The control circuit 7 is composed of a microprocessor and its peripheral circuits, and normally the contacts of the relay R are short-circuited. However, after the first alarm signal is input from the signal processing circuit 6. When a predetermined number or more of alarm signals are input within a predetermined time, the contact of the relay R is opened and the display element 4 is lit for a predetermined time.

The controller 12 monitors whether the monitoring loop is short-circuited or open, and when it is open, turns on an alarm lamp (not shown) indicating that an abnormal state has occurred. For example, a buzzer or a bell emits an alarm sound, or a notification device (not shown) is used to notify a security company.

The above is the normal processing performed by the control circuit 7, but the control circuit 7 also performs the operation confirmation processing at every predetermined time, for example, every one hour. At this time, the control circuit 7 gives a predetermined number of drive pulses P to the heater drive section 9 at a predetermined cycle as shown in FIG. In FIG. 4, three drive pulses P having a pulse width τ are given at a cycle t ₀ .

In response to this, every time the heater driving section 9 receives the driving pulse P, it supplies a current to the heater 8 arranged near the pyroelectric element 5. This causes the heater 8 to generate heat, but the pyroelectric element 5 receives the heat ray radiated from the heater 8 and outputs a signal having a level according to the amount of received light. The signal processing circuit 6 performs the above-described predetermined processing on the signal from the pyroelectric element 5 and outputs an alarm signal to the control circuit 7 when the level of the signal is equal to or higher than the threshold value.

The control circuit 7 includes a heater driving unit 9
It is monitored whether an alarm signal is input corresponding to the drive pulse P given to the drive pulse P. When the alarm signal is input corresponding to the drive pulse P, the pyroelectric element 5 and the signal processing circuit 6 are normally operated. However, if the warning signal is not input in response to the drive pulse P, the pyroelectric element 5 and the signal are detected. Assuming that one or both of the processing circuits 6 are out of order, the relay R is opened and the display element 4 is lit.

The above is the operation confirmation processing executed by the heat ray sensor 1. By performing such processing, it is possible to know whether or not the pyroelectric element 5 and the signal processing circuit 6 are operating normally. . That is, when the relay R of the heat ray sensor 1 is opened, the controller 12 displays an alarm sound or an alarm lamp lighting to indicate that an abnormal state has occurred. Although it is not possible to identify whether there is an intruder or the heat ray sensor 1 is out of order by only this, if the display element 4 continues to be in the lighting state when the display element 4 continues to be lit, it goes to the site where the heat ray sensor 1 is attached. Can know that he is out of order.

Although the heater 8 is arranged near the pyroelectric element 5 in FIG. 3, the heater 8
Since the position of arranging the heat ray may be a position where the heat ray is incident on the pyroelectric element 5, it can be disposed outside the cover of the heat ray sensor 1. Also, heater 8
Although heat rays are given to the pyroelectric element 5 by the above, a light emitting element that emits heat rays can be used instead of the heater 8.

[0014]

By the way, the control circuit 7
The control circuit 7 does not determine that there is an intruder even if a predetermined number of alarm signals are input within a predetermined time during the operation confirmation process. This is because if the normal intruder detection process is also performed during the operation confirmation process, the heat ray sensor 1 operates normally,
In addition, even if there is no intruder, the control circuit 7 may determine that there is an intruder due to the heat ray from the heater 8.

Therefore, the contact of the relay R is in a short-circuited state during the operation confirmation process. However, for that reason, for example, during the operation confirmation process at night. If there is an intruder, the control circuit 7 may fail to report the fact that there is no intruder in spite of the presence of the intruder.

As a method of avoiding such a situation, for example, the operation confirmation processing is performed only once a day during the day when the security guard against the intruder is released, and the security guard at night is used. It is conceivable to set the control circuit 7 so as not to perform the operation confirmation process within the time for performing
The longer the time interval for performing the operation confirmation process is, the longer the time without noticing that the pyroelectric element 5 and / or the signal processing circuit 6 has failed is not preferable. Therefore, usually, as described above, every hour,
Alternatively, the operation confirmation process is executed every two hours at the longest.

On the other hand, if an electric current is made to flow from the outside to the heater provided inside or inside the cover of each heat ray sensor 1, it is possible to confirm the operation of the heat ray sensor 1 at a desired time. However, in this case, it is necessary to add a power line to supply current to the heater,
Not only is the construction very troublesome, but the cost is also high.

Further, whether or not the heat ray sensor 1 is operating normally can be determined by observing the state of the display element 4. That is, as described above, the control circuit 7 displays when a predetermined number or more of warning signals are input within a predetermined time after the first warning signal is input from the signal processing circuit 6, that is, when a heat ray is detected. Since the element 4 is turned on for a predetermined time, it is possible to confirm that the heat ray sensor 1 is operating normally if the display element 4 is turned on when the display unit 4 is moved when the warning zone is set.

However, when a heat ray is detected, the display element 4
Is lit, it is possible for a third party to know what position the alert zone is set to, and therefore the display element 4 does not illuminate even when a user detects a heat ray. You may wish to do so. Therefore, in the heat ray sensor, as shown in FIG.
As shown in FIG. 5, the dip switch 10 is provided, and the dip switch 10 can be set so that the display element 4 does not light up even when a person crosses the warning zone. That is, the control circuit 7 determines, based on the state of the dip switch 10, whether the display element 4 should be turned on or off when a person is detected.

In the following, a state in which the display element 4 is lit when a person is detected is referred to as a lighting mode, and a state in which the display element 4 is not lit even when a person is detected is referred to as an extinction mode.

Therefore, when the light-off mode is set by the DIP switch 10, the display element 4 does not light even if the location where the warning zone is set is moved, so that the operation cannot be confirmed.

Of course, it may be operated in the lighting mode. In that case, the heat ray sensor 1 operates normally by observing whether or not the display element 4 lights up when the warning zone is crossed. It is possible to confirm whether or not the warning zone is set if the adjustment of the condensing optical system is not proper and the warning zone is not formed at the desired position. The display element 4 will not light up even if it is moved to a different position.

In other words, in the lighting mode, the display element 4 may not be lit even if it moves to a place where the warning zone may be set. In this case, the pyroelectric element 5, It is not possible to determine whether the signal processing circuit 6 is out of order, or whether the pyroelectric element 5 and the signal processing circuit 6 are operating normally but the focusing optical system is not properly adjusted.

The warning zone may be set at a dangerous place such as a cliff. In such a case, even if the lighting mode is set, the display element 4 is turned on by moving the warning zone. It is not possible to confirm whether or not to do it.

The present invention is intended to solve the above-mentioned problems, regardless of where the heat ray sensor is installed and whether the lighting mode or the extinction mode is set, An object of the present invention is to provide a heat ray sensor capable of performing operation confirmation at a desired time.

[0026]

In order to achieve the above object, the heat ray sensor according to claim 1 is a heat ray sensor having an operation confirmation function, and when the power is turned on, within a predetermined time thereafter. It is characterized in that it is provided with a control means for performing an operation confirmation process.

The crime prevention alarm system according to a second aspect of the invention is a crime prevention warning system including a heat ray sensor having an operation confirmation function and a controller. One heat ray sensor is provided in one monitoring loop formed in the controller. This heat ray sensor is provided with control means for performing operation confirmation processing within a predetermined time after power is turned on, and the controller determines whether or not the heat ray sensor has normally operated in the operation confirmation processing. It is characterized by comprising a control means for determining whether or not.

[0028]

First, the operation and effect of the heat ray sensor according to the first aspect will be described. When the power is turned on, the control means executes the operation confirmation process within a predetermined time thereafter. Therefore, the operation confirmation can be performed at any time when desired by a simple operation of once turning off the power supply to the heat ray sensor and then turning it on again. Can be avoided.

Further, the operation can be confirmed even when the heat ray sensor is installed in a dangerous place. Further, the heat ray sensor can be attached in the same manner as the conventional one without increasing the wiring.

Next, the operation and effect of the crime prevention alarm system according to the second aspect will be described. In this security alarm system, one heat ray sensor is provided in one monitoring loop. When the power supply is turned on, the control means of the heat ray sensor executes the operation confirmation processing within a predetermined time thereafter, and the control means of the controller determines the result of the operation confirmation processing.

Therefore, the operation check can be performed at any time by a simple operation of once turning off the power supply to the heat ray sensor and then turning it on again. It is possible to avoid a false alarm based on it.

Further, in this crime prevention alarm system,
Since the control means of the controller determines the result of the operation confirmation process, it is possible to confirm whether or not the operation is normally performed including the matter of whether the relay contact of the heat ray sensor is welded.

Further, the operation can be confirmed even when the heat ray sensor is installed in a dangerous place, and the heat ray sensor can be attached in the same manner as the conventional one without increasing the wiring.

[0034]

Embodiments will be described below with reference to the drawings.
FIG. 1 is a diagram showing a configuration example of a heat ray sensor according to the present invention, and a configuration example of a crime prevention alarm system using the heat ray sensor. In the figure, 13 denotes a power supply device and 21 denotes a control circuit. It should be noted that the same components as those shown in FIG. 3 are designated by the same reference numerals as those in FIG.

In FIG. 1, the controller 12 is provided with a switch 14 for activating the operation confirmation of the heat ray sensor 1. The control circuit 21 of the controller 12 instructs the power supply device 13 to operate when the switch 14 is operated. A control signal indicating the stop of power supply to each heat ray sensor 1 is notified. Upon receiving this control signal, the power supply device 13 stops the supply of power to each heat ray sensor 1, and starts supplying power to each heat ray sensor 1 again after a predetermined time.

When the power is turned on, the control circuit 7 of the heat ray sensor 1 waits for a warm-up time including the time for starting the pyroelectric element 5, and when the warm-up time elapses, Whether the lighting mode or the extinguishing mode is set by the DIP switch 10, the display element 4 is caused to blink in the first cycle for a predetermined time, and the same operation confirmation processing as the above-described conventional operation is started. . Therefore, the worker on site can confirm that the operation confirmation process has started by observing the blinking state of the display element 4.

When the control circuit 7 determines that the pyroelectric element 5 and the signal processing circuit 6 are operating normally as a result of the operation confirmation processing, the control element 7 sets the display element 4 to the predetermined cycle in the second cycle. Flash for hours. Therefore, the worker on the site is
By observing the blinking state of the heat ray sensor 1
Can be confirmed to be operating normally.

However, when it is determined that the pyroelectric element 5 or the signal processing circuit 6 is not operating normally as a result of the operation confirmation processing, the display element 4 continues to blink in the third cycle and the relay Release R. Therefore, a worker on site can confirm that the heat ray sensor 1 has some failure by observing the blinking state of the display element 4.

At this time, the control circuit 2 of the controller 12
1 recognizes that each heat ray sensor 1 is currently performing an operation confirmation process, and if the monitoring loop is opened at this time, one of the heat ray sensors 1 in the monitoring loop is It is determined that there is a failure and the failure is displayed on the heat ray sensor 1 in the monitoring loop. This display can be performed, for example, by turning on a lamp indicating a failure. Further, the control circuit 21 determines that all the heat ray sensors 1 are operating normally when the monitoring loop is in the short-circuited state even after a predetermined time has elapsed after the switch 14 was operated. The operation confirmation process ends.

When the control circuit 7 of the heat ray sensor 1 determines that the operation has been normally performed as a result of the operation confirmation processing, the operation confirmation processing is terminated and a normal heat ray detection processing is performed. Return to.

In the above description, the case where the operation check is performed after the heat ray sensor 1 is attached to the predetermined position has been described, but the power source wire 11 is connected to the power source terminals T ₁ and T ₂ during the installation work. The control circuit 7 executes the above-described operation confirmation processing even when power is supplied.

As described above, according to this embodiment, it is possible to cause the heat ray sensor 1 to perform the operation confirmation process only by a simple operation of operating the switch 14 to turn on / off the power source. Regardless of where the heat ray sensor is installed, whether the lighting mode or the extinguishing mode is set by the dip switch 10, it is possible to confirm the operation at any time when desired. It is possible to avoid a false alarm due to the operation confirmation processing as described above.

Further, even when the heat ray sensor is installed in a dangerous place, the operation can be easily confirmed, and the heat ray sensor can be attached in the same manner as the conventional one without increasing the wiring.

The first embodiment has been described above.
Next, a second embodiment will be described with reference to FIG.

By the way, in the first embodiment, since a plurality of heat ray sensors are connected to one monitoring loop, even if the monitoring loop is opened during the operation check, the controller 12 On the side, it is not possible to identify which heat ray sensor has failed. Of course, the worker at the site can know from the blinking state of the display element 4 whether the heat ray sensor 1 being observed is normal or has failed, but the controller 12 side normally detects each heat ray sensor. It is not possible to determine whether it is working or has failed.

Further, in the first embodiment, the control circuit 7 of the heat ray sensor 1 opens the relay R when it is determined that there is a failure as a result of the operation confirmation processing. However, the contact of the relay R may be welded when lightning occurs, and when the contact of the relay R is welded, even if the control circuit 7 tries to open the relay R, it is not opened. The control circuit 21 of the controller 12 does not operate on all the heat ray sensors 1 in spite of the failure of welding.
Will be judged to be operating normally.

Therefore, the second embodiment has the configuration shown in FIG. 2 in order to solve the above problems. Note that FIG.
The same components as those shown in are denoted by the same reference numerals, and duplicate description will be omitted.

In FIG. 2, a plurality of monitoring loops are formed in the controller 12, but only one heat ray sensor 1 is connected to one monitoring loop.

When the switch 14 is operated, the control circuit 21 of the controller 12 notifies the power supply device 13 of a control signal indicating stop of power supply to each heat ray sensor 1.
Upon receiving this control signal, the power supply device 13 stops the supply of power to each heat ray sensor 1, and starts supplying power to each heat ray sensor 1 again after a predetermined time.

When the power is turned on, the control circuit 7 of the heat ray sensor 1 waits for a warm-up time including the time for starting the pyroelectric element 5, and when the warm-up time elapses, Whether the lighting mode or the extinguishing mode is set by the DIP switch 10, the display element 4 is caused to blink in the first cycle for a predetermined time, and the same operation confirmation processing as the above-described conventional operation is started. . Therefore, the worker on site can confirm that the operation confirmation process has started by observing the blinking state of the display element 4.

The operation confirmation processing executed by the control circuit 7 of the heat ray sensor 1 is different from the processing in the first embodiment described above. That is, in the first embodiment, the control circuit 7 monitors whether or not the alarm signal is input in response to the drive pulse P given to the heater drive unit 9, and the alarm signal is output in response to the drive pulse P. If no signal is input, the relay R is opened and the display element 4 is turned on as if it is in failure. In the second embodiment, the control circuit 7 drives the drive pulse. A process of monitoring whether or not an alarm signal is input corresponding to P and displaying the result using the display element 4, and a relay R is opened each time an alarm signal is input from the signal processing circuit 6. Perform processing and.

Therefore, for example, assuming that the heater driving section 9 is supplied with three driving pulses as shown in FIG. 4, the signal processing circuit 6 synchronizes with these driving pulses P when there is no failure. Since the alarm signal is output three times, the control circuit 7 opens the relay R three times.

When the alarm signal corresponding to the drive pulse P is input, the control circuit 7 judges that the display device 4 is operating normally, and causes the display element 4 to blink in the second cycle for a predetermined time. If the alarm signal is not input in response to the drive pulse P, it is determined that there is a failure, and the display element 4 continues to blink in the third cycle. Therefore, a worker on the site can confirm whether the heat ray sensor 1 is operating normally or is out of order by observing the blinking state of the display element 4.

On the other hand, the control circuit 21 of the controller 12 indicates that the operation confirmation process is currently being executed in the heat ray sensor 1 and what cycle the drive pulse P is in the operation confirmation process. Since it recognizes how many of them are used, and when the heat ray sensor 1 is normal, it recognizes how many times the monitoring loop should be opened within a predetermined time after the switch 14 is operated. It is monitored how many times the monitoring loop is opened within a predetermined time after the switch 14 is operated, and when the monitoring loop is opened by the number of drive pulses, it is determined that the heat ray sensor 1 is normal. A predetermined display is performed, and in other cases, it is determined that an abnormality has occurred and a predetermined display is performed. It is obvious to those skilled in the art that these displays can be performed by, for example, turning on a lamp indicating normality or a lamp indicating abnormality.

If the control circuit 7 of the heat ray sensor 1 and the control circuit 21 of the controller 12 determine that the heat ray sensor 1 is normal as a result of the operation confirmation processing, the operation confirmation processing is terminated, The process returns to the normal heat ray detection process.

In the above description, the case where the operation check is performed after the heat ray sensor 1 is attached to the predetermined position has been described, but the power source line 11 is connected to the power source terminals T ₁ and T ₂ during the installation work. The control circuit 7 executes the above-described operation confirmation processing even when power is supplied.

As described above, according to this embodiment, since only one heat ray sensor is provided in one monitoring loop, it is possible to identify which heat ray sensor has an abnormality on the controller 12 side. it can. Moreover, since the control circuit 7 of the heat ray sensor 1 opens the relay R each time it receives an alarm signal from the signal processing circuit 6 in the operation confirmation process, the controller 12 side determines whether the contact of the relay R is welded. It is possible to determine whether the heat ray sensor 1 is normal, including the above.

Further, since it is possible to cause the heat ray sensor 1 to carry out the operation confirmation process only by a simple operation of operating the switch 14 of the controller 12 to turn on / off the power source, what kind of heat ray sensor is used? Even if it is installed at a location, regardless of whether the dip switch 10 is set to the lighting mode or the extinction mode, the operation can be confirmed at any time when desired, and the operation confirmation as in the conventional case can be performed. Loss of information due to processing can be avoided.

Further, even when the heat ray sensor is installed in a dangerous place, the operation can be easily confirmed, and the heat ray sensor can be attached in the same manner as the conventional one without increasing the wiring.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments and various modifications can be made. For example, although various states are displayed according to the blinking cycle of one display element 4 in the above embodiment, a plurality of display elements having different emission colors may be used.

[Brief description of drawings]

FIG. 1 is a diagram showing a first embodiment according to the present invention.

FIG. 2 is a diagram showing a second embodiment according to the present invention.

FIG. 3 is a diagram showing a schematic circuit configuration of a conventional heat ray sensor having an operation confirmation function and a configuration example of a crime prevention alarm system using the heat ray sensor.

FIG. 4 is a diagram for explaining an operation confirmation process.

[Explanation of symbols]

1 ... Heat ray sensor, 5 ... Pyroelectric element, 6 ... Signal processing circuit, 7
... control circuit, 8 ... heater, 9 ... heater driving unit, 10
... DIP switch, 11 ... power supply line, 12 ... controller, 13 ... power unit, 14 ... switch, 21 ... control circuit, R ... relay, S _1, S ₂ ... signal terminals, T _1, T ₂ ...
Power terminal.

Claims (2)

[Claims] 1. A heat ray sensor having an operation confirming function, comprising control means for performing an operation confirming process within a predetermined time after the power is turned on. 2. In a crime prevention alarm system including a heat ray sensor having an operation confirmation function and a controller, one heat ray sensor is provided in one monitoring loop formed in the controller, and this heat ray sensor is a power source. When it is turned on, it is provided with a control means for performing an operation confirmation process within a predetermined time thereafter, and the controller is provided with a control means for determining whether or not the heat ray sensor has normally operated in the operation confirmation process. A featured security alarm system.