JPH0844959A - Steal monitor device - Google Patents

Abstract

PURPOSE:To provide the steal monitor device which can immediately recognize a sensor having outputted a detection signal when the device is detached from an article. CONSTITUTION:Repeaters 42-44 equipped with pairs of series-connected field effect transistors 48-50 which turn OFF when sensors 21-29 are detached from corrugated cartons 30-32, 34-36, and 38-40 containing articles and electric resistances 45-47 which are different in electric resistance value and LEDs (not illustrated) which illuminate while the field effect transistors 48-50 turn OFF and correspond to the respective sensors are connected to the power source 8 and electric resistance 11 of a main body 7 so that the connection pairs are connected in parallel; and the device is provided with an A/D converter 14 which detects the value of a voltage applied to the electric resistance 11.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a theft monitoring device for detecting theft of goods such as goods and exhibits.

[0002]

2. Description of the Related Art An outline of a conventional example of this type of theft monitoring device will be described below with reference to FIGS.

In the circuit diagram of FIG. 6, a plurality of sensors 1
Is a push switch, and the control means 2 is a sensor 1
The alarm means 3 is sounded when is turned off. The plurality of sensors 1 are connected in series via the control means 2 and the power supply 4, and the control means 2 is connected to the alarm means 3. Further, as shown in FIG. 7A, each sensor 1 is fixed by an adhesive tape 6 for each article 5 to be monitored for theft in the ON state.

Then, as shown in FIG.
When the object 5 is peeled off from the article 5, the sensor 1 changes from the on state to the off state, and the control means 2 sounds the alarm means 3 to notify that the article 5 has been stolen, so that the article 5 is removed. It was supposed to prevent it.

[0005]

However, in the conventional theft monitoring device, it is possible to detect that any one of the plurality of sensors 1 has an abnormality, but it is not possible to individually recognize the sensor 1 having the abnormality. Because it was a structure,
In order to find a stolen article, all the articles must be confirmed, and the confirmation work is extremely complicated.

Therefore, the present invention solves these problems,
A theft monitoring device capable of immediately recognizing a stolen article even if the number of sensors is large.

[0007]

As a first means for solving the above-mentioned problems, the present invention provides a plurality of sensors for outputting a detection signal when they are separated from an article, a circuit element and a switch means in series. The relay unit includes a plurality of repeaters having a connected pair and a main body having a power source and a detection unit, and the electric constants of the circuit elements are different for each repeater, and the connection pairs of the plurality of repeaters are the main body. Connected to the power source in parallel, the detection signals of the plurality of sensors are output to the switch means, the switch means is opened and closed, and the detection means detects an electric signal introduced into the main body. It was configured.

As a second means for solving the above-mentioned problems, the present invention provides a plurality of repeaters having a connecting pair in which the circuit element and the switch means are connected in parallel. The connecting pair group in which the connecting pair is connected in series is connected to the power source of the main body in series.

Further, in the first means for solving the above problems, the present invention provides that the circuit element is an electric resistance,
The switch means is a field effect transistor and is configured to apply a constant voltage to the connection pair.

In the second means for solving the above-mentioned problems, the present invention provides that the circuit element is an electric resistance,
The switch means is a field effect transistor, and a constant current is supplied to the connection pair by a constant current circuit.

Further, the first and first aspects for solving the above problems
2 means, LED corresponding to the plurality of the sensors
Is provided in the repeater and is turned on according to the output of the detection signals of the plurality of sensors.

Furthermore, in the first and second means for solving the above-mentioned problems, the detecting means is a means for converting an electric signal to be repeatedly detected into a digital code signal, and the detected initial electric signal is the above-mentioned. A first memory which is converted and recorded by the means, and a digital code signal which is obtained by converting the detected electric signal by the means.
The second memory which records the digital code signal when it is different from the recording of the second memory and the difference between the second memory which records the electric signal repeatedly detected by the means and the recording of the first and second memories. A comparison judgment circuit for judging, wherein the comparison judgment circuit judges that there is a difference between the recording of the first memory and the detected digital signal of the electric signal detected by the means; The code signal of No. 2 is recorded in the second memory, and when it is determined that there is no difference between the plurality of code signals obtained by converting the detected plurality of electric signals by the means and the recording of the second memory, The configuration is such that the memory record is output.

As a third means for solving the above-mentioned problems, a constant current circuit of a plurality of repeaters set to different current values is used instead of the circuit element in the first means. May be.

Similarly, as a fourth means for solving the above problems, instead of the circuit element and the switch means in the first means, conduction / cutoff control is performed by the detection signal, and a plurality of relays are provided. You may use the constant current circuit set to the different electric current value of the container.

[0015]

According to the above-mentioned first means and second means,
The electric signal introduced into the main body changes when the sensor is separated from the article, and the change is detected by the detection means,
It is possible to specify a repeater having an opening / closing switch means.

In the first and second means of the present invention, the circuit element is an electric resistance, the switch means is a field effect transistor, and a constant voltage is applied to the connection pair, or a constant current circuit is used. By passing a constant current,
A repeater having the field effect transistor turned on and off can be identified.

Further, in the first and second means, an LED corresponding to a plurality of the sensors is provided in the repeater, and the LED is turned on in response to the output of the detection signal of the plurality of the sensors so that the object of theft monitoring can be obtained. It is possible to specify the sensor from which the article has been detached.

Further, in the first and second means, the detecting means converts the electric signal repeatedly detected into a digital code signal, and the detected initial electric signal is converted by the means and recorded. A first memory, and a second memory that records the digital code signal when the detected digital signal converted by the means is different from the digital code signal recorded in the first memory,
An electric signal to be repeatedly detected is converted by the means, and a comparison / judgment circuit for judging whether or not there is a difference from the recorded data in the first and second memories is provided, and the comparison / judgment circuit is provided in the first memory. It is determined that there is a difference between the recorded and detected electric signal and the digital code signal converted by the means, the digital code signal is recorded in the second memory, and the detected plurality of electric signals are recorded. When it is determined that there is no difference between the plurality of code signals converted by the means and the recording in the second memory, the recording in the second memory is output, so that the opening and closing is surely performed without being affected by noise. It is possible to specify a repeater having a previous switch means.

Further, according to the third and fourth means, since a constant current circuit is used for each repeater, for example, a predetermined signal is not output to the main body due to a voltage drop due to wiring resistance to the repeater. There is no fear of.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The outline of an embodiment of the present invention will be described below with reference to FIGS.

FIG. 1 shows a theft monitoring device according to a first embodiment of the present invention. The first embodiment will be described. The main body 7 includes a power source 8, a switch 9 and an electric device incorporated in a repeater. The voltage applied to the resistor is constant (5V), and is a negative voltage type CMOS three-terminal regulator 10 with little power consumption itself, a reference electric resistance 11 of 10 KΩ, and a buzzer 1.
2. Read the voltage value applied to the display device 13 and the reference electric resistance 11, convert the value into a binary digital value and output it, input the voltage value output from the A / D converter 14 And a control circuit 1 for controlling the operations of the buzzer 12 and the display device 13 according to the voltage value.
5, the connector 16 and the ground 17. Also,
The control circuit 15 includes the first and second memories 18 and 19 for recording the voltage value input from the A / D converter 14, and the A / D
A comparison determination circuit 20 is provided which compares the voltage value input from the converter 14 with the value recorded in the first or second memory 18 or 19 and determines the difference.

The one terminal 16a of the connector 16 is
The positive electrode of the power supply 8 is output via the switch 9. Further, one terminal 16 b of the connector 16 is connected to the negative electrode of the external power source 8 via the CMOS three-terminal regulator 10 and the reference electric resistance 11. Further, one terminal 16c of the connector 16 is connected to the ground 17. further,
The A / D converter 14 is connected to both ends of the reference electric resistance 11 and measures the voltage value applied to the reference electric resistance 11. Further, the A / D converter 14 includes the control circuit 1
5, the control circuit 15 is connected to the buzzer 12 and the display device 13.

The sensors 21 to 29 are each provided with a phototransistor, and the products 30a to 32a, 34a to 36a, 38a to 30a to 32a, 34a to 36a, 38a arranged in the product sales areas 33, 37 and 41, respectively.
Cardboard boxes 30-32, 34-3 containing 40a
The phototransistors are pierced at 6, 38 to 40 and installed so as to correspond to each product, and when external light is detected by being pulled out, a signal is output.

The repeaters 42, 43, and 44 are respectively 10
KΩ electrical resistance 45, 20KΩ electrical resistance 46, 40K
Ω electric resistance 47, field effect transistor (hereinafter FE
(Abbreviated as T) 48, 49, 50, which receives output signals from the sensors 21, 22, 23 and turns off the FET 48. Receives output signals from the detection circuit 51 and the sensors 24, 25, 26 and turns off the FET 49. Detection circuit 52, sensor 2
It is provided with a detection circuit 53 which receives output signals from 7, 28 and 29 and turns off the FET 50.

The repeater 42 has connectors 54, 5
5, the lead wires 56, 57 and 58 are provided,
57 and 58, the respective terminals 54a, 54 of the connector 54
b, 54c and each terminal 55a, 55b, 5 of the connector 55
5c are connected respectively. And again, the repeater 4
3 and 44 are also connectors 59 and 60 and connector 6 respectively.
4, 65, lead wires 61, 62, 63, and lead wires 66, 67, 68, and like the repeater 42, each terminal 59a, 59b, 59c of the connector 59 and each terminal 60a, 60b of the connector 60. , 60c, and the terminals 64a, 64b, 64c of the connector 64 and the terminals 65a, 65b, 65c of the connector 65, respectively.
1, 62, 63 and lead wires 66, 67, 68, and the terminals 65a, 65 of the connector 65.
b connects the lead wires 66 and 67.

In the repeater 42, the electric resistance 45
One end 45a and the other end 45b of the FET 48 are connected to the lead wire 56 at the one end 45a and the source 48a of the FET 48 at the other end 45b.
The drain 48b of the FET 48 is connected to the lead wire 57. Further, the detection circuit 51 of the repeater 42 includes the lead wires 56 and 58 and the gate 48 of the FET 48.
It is connected to c.

Also in the repeaters 43 and 44, similarly to the repeater 42, one end 46a and the other end 46b of the electric resistance 46 and one end 47a and the other end 47b of the electric resistance 47 are respectively the lead wire 61 and the FET 49. Source 49a,
The lead wire 66 is connected to the source 50a of the FET 50, and the drains 49b and 50b of the FETs 49 and 50 are connected to the lead wires 62 and 67, respectively. Further, the detection circuits 52 and 53 of the repeaters 43 and 44 respectively include the lead wires 61 and 63, the lead wires 66 and 68, and the FET 49.
Is connected to the gate 49c of the FET 50 and the gate 50c of the FET 50.

Further, in the repeater 42, the sensors 21, 22, 23 are connected to the detection circuit 51, and the terminals 54a, 54b, 54c of the connector 54 are respectively the terminals 16a of the connector 16 of the main body 7. , 16
b, 16c.

Further, in the repeaters 43 and 44, the detection circuits 52 and 53 are connected to the sensors 24 and 2, respectively.
5, 26, sensors 27, 28, 29 are connected, and terminals 59a, 59b, 59c of the connector 59,
The terminals 64a, 64b, 64c of the connector 64 are respectively terminals 55a, 55 of the connector 55 of the repeater 42.
b, 55c, each terminal 60 of the connector 60 of the repeater 43
a, 60b, 60c.

When the switch 9 is turned on, the power source 8
The voltage from the gates 48c, 49c of the FETs 48, 49, 50 passes through the detection circuits 51, 52, 53, respectively.
50c, the FETs 48, 49 and 50 are turned on. Furthermore, the electric resistance 45-FET 48,
Electric resistance 46-FET49, electric resistance 47-FET50
Because each connected pair of is connected in parallel,
The total of the currents flowing through 5, 46 and 47 is C of the main body 7.
It enters the MOS three-terminal regulator 10 (since this regulator is a negative voltage type, current flows from the output side). However, since the CMOS type consumes almost no current,
The current flows into the reference electric resistance 11 almost as it is.

Next, the operation of the theft monitoring device according to the first embodiment of the present invention will be described with reference to FIG. 2 as well (hereinafter, the values in parentheses are the numbers in FIG. 2). First, when the switch 9 is turned on, the A / D converter 14 reads the initial value of the voltage applied to the reference electric resistance 11 of the main body 7,
It is converted into a digital code signal (step 101).
The A / D converter 14 outputs the digital code signal to the control circuit 15. The control circuit 15 records the digital code signal output from the A / D converter 14 in the first memory 18 incorporated in the control circuit 15 (step 102). Further, the A / D converter 14 reads the voltage value applied across the reference electric resistance 11 every 25 μsec and converts it into a digital code signal (step 10).
3) The digital code signal is output to the control circuit 15. The comparison determination circuit 20 compares the output digital code signal with the digital code signal recorded in the first memory 18 to determine whether there is a difference (step 104), and determines that there is no difference. In case of A
The digital code signal output from the / D converter 14 and the digital code signal recorded in the first memory 18 are compared to determine whether there is a difference or not (step 104). When it is determined that there is a difference, the comparison / determination circuit 20 records the digital code signal output from the A / D converter 14 having the difference in the second memory 19 (step 105) and Although not shown, it is recorded that the counter incorporated in the comparison / determination circuit 20 has one difference (step 106).
In the comparison / determination circuit 20, the A / D converter 14 further converts the digital code signals into one (step 10).
7) The output voltage value is compared with the digital code signal recorded in the second memory 19 to determine the difference (step 108). If the comparison / determination circuit 20 determines that there is a difference, the process immediately returns to the original process (step 103) of reading the voltage value and converting it into a digital code signal. When the comparison / determination circuit 20 determines that there is no difference, the counter incorporated in the comparison / determination circuit 20 counts the number of times that there is no difference (step 110), and the digital signals output from the A / D converter 14 one after another. And the digital code signal recorded in the second memory 19 are compared to determine whether there is a difference (step 108). Then, when it is determined that there is no difference for 16 consecutive times (step 109), the buzzer 12 is sounded immediately (step 111). Therefore, it is possible to prevent a malfunction of the main body 7 when the voltage value applied to the reference electric resistance 11 is momentarily changed due to noise or the like.

Any one of the sensors 21 to 29 may be detached from the cardboard boxes 30 to 32, 34 to 36, 38 to 40, or the cardboard boxes 30 to 32, 34 to 36, 3 may be removed.
When 8 to 40 are destroyed, at least one of the sensors 21 to 29 detects the abnormality and outputs a signal to the detection circuits 51, 52, 53 corresponding to each sensor.

The detection circuits 51, 52 and 53 which receive the signals output from the sensors are FETs corresponding to the respective detection circuits.
Stop applying voltage to the gates 48c, 49c, 50c of 48, 49, 50. This turns off the FETs 48, 49, 50 corresponding to the detection circuit. And each F
As the current stops flowing through the electric resistances 45, 46, 47 corresponding to ET, the value of the current flowing through the electric resistance 11 of the main body 7 changes, and the voltage value applied to the reference electric resistance 11 changes. Although not shown, the repeaters 42, 43,
An LED corresponding to each sensor is provided at 44, and is turned on when the sensor detects an abnormality.

The A / D converter 14 reads the change in the voltage value applied to the reference electric resistance 11, and the control circuit 15
The navel value is converted into a digital code signal and output.
That is, the A / D converter 14 has the electric resistances 45, 4
A voltage of 8.75 V is applied to the reference electric resistance 11 when a current flows through all 6, 47, and the code signal (111) corresponding to this voltage value is output. When the current stops flowing through any one of the electric resistances 45, 46, 47, the voltage applied to the reference electric resistance 11 becomes 3.75V, 6.25V, 7.5V, respectively, and corresponds to the voltage value. The code signals (011), (101),
(110) is output. Also, the electric resistances 45 and 46, the electric resistances 46 and 47, and the electric resistances 45 and 4
When the current stops flowing in 7, the voltages applied to the reference electric resistance 11 become 1.25 V, 5 V and 2.5 V, respectively, and the code signals (0
01), (100), (010) are output, and the electric resistance 4
When the current stops flowing in all 5, 46, 47,
The voltage applied to the reference electric resistance 11 is 0 V, and the code signal (000) is output. Control circuit 1
The reference numeral 5 denotes a buzzer 1 after performing the above-described processing based on the digital code signal output from the A / D converter 14.
Ring 4 and identify the repeater that detected the abnormality,
It is displayed on the display device 15. That is, the electric resistance 4
Since the electric resistance values of 5, 46, and 47 are different from each other, the change in the voltage value applied to the reference electric resistance 11 corresponds to the electric resistance at which the current stops flowing, and specifies the repeater to which the sensor detecting the abnormality is connected. be able to. Further, the repeater is provided with an LED that lights up when the sensor detects an abnormality, so that a stolen article can be identified.

Here, each of the voltage values applied to the reference electric resistance 11 is generated by a voltage drop based on the current supplied by the electric resistances 45 to 47 in each relay. Therefore, as shown in FIG.
Instead of 5 to 47, a constant current circuit 70 set to a different current value is prepared in each repeater, and the same result can be obtained by directly supplying a current (if matching the above example, The same result can be obtained by using a constant current circuit set to a current value of 0.5 mA for the repeater 42x, 0.25 mA for the repeater 43x, and 0.125 mA for the repeater 44x). Further, the CMOS three-terminal regulator 10 of the main body 7 is unnecessary. According to the above configuration, the main body 7 and the repeater 42
Even when the distance between x and 44x is large and the resistance of the connecting line cannot be ignored, a predetermined current is supplied,
It has an excellent effect that it is not easily affected. Therefore, improvement in reliability against repeated trampling of wiring,
The restriction on the distance to the repeater can be relaxed, and as a result, the theft monitoring device according to the present invention can be applied to a larger store.

Further, if the constant current circuit is used, as shown in FIG. 4, a constant current circuit 80 capable of controlling conduction / interruption is used in the repeaters 42y to 44y, and the detection signal is directly supplied to the constant current circuit 80. It may be applied. This constant current circuit 80 has a control terminal 81. If the control terminal 81 is high, the circuit operates, and the set current flows from the power supply 8 (in FIG. 1) to the CMOS three-terminal regulator 10 ( Continuity),
If it is low, no current will flow (cut off). This constant current circuit 80
According to the above, the detection circuits 51 to 53 may be the same as those in the embodiment using the electric resistance, and it is not necessary to modify them (the sensor circuits are cut off, that is, turned off). In this case (of Figure 1)
It goes without saying that it is not necessary to separately provide switch means such as the FETs 48 to 50. The constant current circuit 70,
The configuration of 80 can use an OP amplifier, a discrete component, a three-terminal regulator, a dedicated IC, or the like.

Next, a second embodiment of the present invention is shown in FIG.
In this theft monitoring device, a constant current circuit 69 for making the current flowing through the relays 42z to 44z constant is provided in the main body 7, and the electrical resistance 45, the FET 48, and the electrical resistance provided in the relays 42z to 44z, respectively. 46, FET4
9. Each of the connection pairs of the electric resistance 47 and the FET 50 includes the lead wires 57a and 57b and the lead wire 62 of 62, respectively.
a, 62b and lead wires 67a, 67b are connected in parallel, and when the FET corresponding to the sensor that has detected an abnormality is turned off by this, the current must flow to the electrical resistance connected in parallel with it. The value of the current flowing through the reference electric resistance 11 of the main body 7 changes due to this, and the voltage value applied to the reference electric resistance 11 changes accordingly. Therefore, it is possible to specify the repeater to which the sensor detecting the abnormality is connected.

Further, when the connection between the repeaters is broken, in the first embodiment, the abnormal repeater in the main body 7 can be recognized, but in the second embodiment, all the main bodies 7 are The first embodiment is preferable to the second embodiment in order to quickly return to the original normal state and monitor the theft since the repeater notifies that the relay is abnormal.

Further, in the first and second embodiments, three sensors are provided for one repeater, and further three repeaters are provided.
However, two or four or more sensors may be provided for one repeater, and two or four or more repeaters may be provided.

Further, in the first and second embodiments, the description has been made by using the connecting pair of the electric resistance and the FET as the repeater, but other than this, for example, instead of the electric resistance, a circuit element such as a capacitor or a coil. Also, switch means such as a relay can be considered instead of the FET. In that case, it is necessary to make the electric constant of the circuit element different for each repeater.

In the first and second embodiments, when the sensor detects an abnormality, the FET as the switch means is turned off (open), but it can be turned on (closed).

Further, in the first and second embodiments, only the battery circuit is built in the main body 7, but when operating with an external power source, the supply of the external power source is cut off. In some cases, another internal battery circuit may be provided to activate the buzzer 12.

Further, the operating repeater may be displayed blinking on the display device 13 provided in the main body 7, and in this case, the thief may have an impression that the theft monitoring device is operating. Yes, it is effective in monitoring theft.

Further, the switch provided on the main body 7 can be turned on / off by the remote controller.
The operability can be improved.

Furthermore, by allowing the main body 7 to record the date and time when the sensor detects an abnormality, it can be used as a countermeasure against theft.

[0046]

As described above, according to the present invention, the switch signal provided in the repeater corresponding to the sensor is opened / closed by the detection signal output when the sensor is detached from the article, and each repeater is opened. The electric signal introduced into the main body is changed by making the electric constants different from each other so that the current does not flow in the circuit element forming the connection pair by connecting the switch means in series or in parallel, or by causing the current to flow. However, since the change is detected by the detection means provided in the main body, it is possible to specify the repeater having the switch means opened and closed by the sensor being detached from the article.

Further, the circuit element is an electric resistance, the switch means is a field effect transistor, a constant voltage is applied to the connection pair in which these are connected in series, and
A constant current is applied to the connection pair in which they are connected in parallel, and a constant current is applied to the connection pair, and the voltage applied to them is used as the electric signal, and the change is detected by the detection means. A repeater having an effect transistor can be identified.

Alternatively, by using a constant current circuit instead of the circuit element, it is possible to prevent the influence of the wiring resistance to the repeater. Therefore, it becomes possible to improve the reliability against repeated steps of wiring and to relax the restriction on the distance to the repeater, and as a result, the theft monitoring device according to the present invention can be applied to a larger scale store. Furthermore, continuity /
If a constant current circuit whose cutoff can be controlled is used, it is not necessary to separately provide the switching means such as a field effect transistor.

An LED corresponding to the plurality of the sensors
Is provided in the repeater and the LED is turned on according to the output of the detection signals of the plurality of sensors, whereby the sensor from which the article is detached can be specified.

Further, the detecting means includes means for converting an electric signal to be repeatedly detected into a digital code signal,
A first memory in which the detected initial electrical signal is converted and recorded by the means, and a digital code signal in which the detected electrical signal is converted by the means is different from the recording in the first memory. There is provided a comparison / determination circuit for determining whether or not there is a difference between the second memory for recording a digital code signal and the electric signal repeatedly detected by the means and comparing with the recording in the first and second memories. Then, the comparison / determination circuit determines that there is a difference between the recording of the first memory and the detected electric signal and the digital code signal converted by the means, and the digital code signal is changed to the second code signal. When it is determined that there is no difference between the plurality of code signals recorded in the memory and the plurality of detected electrical signals converted by the means and the recording in the second memory, By outputting the record, it is possible to identify the repeater having a year switching means which is securely opened and closed without being affected by noise.

As a result, it is possible to provide a theft monitoring device which can immediately recognize a stolen article even if the number of sensors is large.

[Brief description of drawings]

FIG. 1 is a schematic circuit diagram of a theft monitoring device according to a first embodiment of the present invention.

FIG. 2 is an explanatory diagram illustrating a flow of operations of first and second embodiments of the present invention.

FIG. 3 is a circuit diagram of a main part according to a first modification of the first embodiment of the present invention.

FIG. 4 is a circuit diagram of a main part according to a second modification of the first embodiment of the present invention.

FIG. 5 is a schematic circuit diagram of a theft monitoring device according to a second embodiment of the present invention.

FIG. 6 is a schematic circuit diagram of a theft monitoring device according to a conventional example.

7A and 7B are schematic enlarged views of a sensor of a theft monitoring device according to a conventional example, where FIG. 7A is a diagram arranged with an article, and FIG. 7B is a diagram detached from the article.

[Explanation of symbols]

 7 main body 11 reference resistance 12 buzzer 13 display device 14 A / D converter 15 control circuit 18 first memory 19 second memory 20 comparison judgment circuit 21-29 sensor 30-32, 34-36, 38-40 cardboard box 42 -44 Repeater 45-47 Electric resistance 48-50 Field effect transistor 51-53 Detection circuit 69 Constant current circuit of 2nd Example

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shin Kiuchi 1-7, Otsuka-cho, Yukiya, Ota-ku, Tokyo Alps Electric Co., Ltd.

Claims (8)

[Claims] 1. A plurality of sensors that output a detection signal when detached from an article, a plurality of repeaters having a connecting pair in which a circuit element and a switch means are connected in series, and a main body having a power supply and a detecting means. The electrical constants of the circuit elements are made different for each of the repeaters, the connection pairs of the plurality of repeaters are connected in parallel to the power source of the main body, and the output of the detection signal of the plurality of sensors is switched by the switch. A theft monitoring device, wherein the switch means is caused to be opened and closed by means of a means, and the detection means detects an electric signal from a repeater introduced into the main body. 2. A plurality of sensors for outputting a detection signal when detached from an article, a plurality of repeaters having a connection pair in which a circuit element and a switch means are connected in parallel, and a main body having a power supply and a detection means. The electrical constants of the circuit elements are made different for each of the repeaters, the connecting pairs of the plurality of repeaters are connected in series to the power source of the main body, and the output of the detection signal of the plurality of sensors is switched by the switch. A theft monitoring device, wherein the switch means is caused to be opened and closed by means of a means, and the detection means detects an electric signal from a repeater introduced into the main body. 3. The theft according to claim 2, wherein the circuit element is an electric resistance, the switch means is a field effect transistor, and a constant current is applied to the connection pair by a constant current circuit. Monitoring equipment. 4. The theft surveillance device according to claim 1, wherein the circuit element is an electric resistance, the switch means is a field effect transistor, and a constant voltage is applied to the connection pair. 5. The LED corresponding to a plurality of the sensors is provided in the repeater, and is turned on according to the output of the detection signal of the plurality of the sensors.
The theft monitoring device described in 2, 3, or 4. 6. The detecting means detects means for converting an electric signal to be repeatedly detected into a digital code signal, a first memory in which the detected initial electric signal is converted and recorded by the means, and detected. A second memory for recording the digital code signal when the digital code signal converted by the means is different from the recording in the first memory; and an electrical signal repeatedly detected by the means for converting. And a comparison determination circuit for determining whether or not there is a difference between the recording in the first and second memories and the recording in the first memory, and an electric signal detected by the comparison determination circuit as recording in the first memory is converted by the means. It is determined that there is a difference between the digital code signal and the digital code signal, the digital code signal is recorded in the second memory, and a plurality of detected electric signals are added to the means. 4. When it is determined that there is no difference between the plurality of code signals converted by the above and the recording in the second memory, the recording in the second memory is output. The theft monitoring device according to 4 or 5. 7. A plurality of sensors that output a detection signal when separated from an article, a plurality of repeaters having a connection pair in which a constant current circuit and a switch means are connected in series, and a main body having a power supply and a detection means. The set current value of the constant current circuit is made different for each repeater, the connection pair of the plurality of repeaters is connected in parallel to the power source of the main body, and the output of the detection signal of the plurality of sensors is formed. To the switch means so that the switch means is opened and closed, and the detection means detects the electric signal from the repeater introduced into the main body. 8. A plurality of sensors for outputting a detection signal when the article is separated from the article, a plurality of repeaters having a constant current circuit capable of controlling conduction / interruption, and a main body having a power supply and a detection means. The set current value of the constant current circuit is made different for each repeater, the constant current circuits of the plurality of repeaters are connected in parallel to the power source of the main body, and the output of the detection signal of the plurality of sensors is A theft monitoring device characterized in that it is led to a constant current circuit so that the constant current circuit is conducted / interrupted, and an electric signal from a repeater introduced into the main body is detected by the detecting means. .