JP2007011676A - System for detecting break of seal - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a system for detecting break of seal for detecting short circuit and swap easily by improving circuit configuration of sealing device using an electronic circuit instead of a conventional IC tag. <P>SOLUTION: The system for detecting break of seal consisting of a sealing part 1, a detecting part 2, and a server 3, monitors the presence of break of sealing or removing of the system for 24 hours by making monitoring software reside in the server 3 to regularly communicate with the detecting part 2. The detecting part 2 housing an A/D converter 21, CPU 22, memory 23 and communication controller 24, transforms a signal voltage of the sealing part 1 into a digital value by the A/D converter 21. The CPU 22 regularly measures and compares the measured value with the initial value stored in the memory 23, determines abnormality if the difference goes beyond the limit of error, and transmits the decision result to the server 3 via the communication controller 24 so that the server 3 raises an alarm by way of alarming, emergency light, or automatic messaging to mobile phone and mail if the decision result or communication is abnormal. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a tampering detection technique applied to prevent the installation of a ROM behind a pachinko or slot, prevent take-out of poisonous and deleterious substances, radioactive substances or confidential documents, and prevent opening after a container seal.

As a technique for electrically detecting unauthorized opening, for example, JP 2000-57292 A uses a seal with a built-in IC tag that can be peeled off, and the reader / writer communicates with it to check whether or not it is opened without contact. A system for detecting this has been proposed.
However, the IC tag communicates with the reader / writer using a long wave band of 135 kHz or less, a 13.56 MHz short wave band, a 2.45 GHz microwave band, etc., and there is a metal between the IC tag and the reader / writer. Because magnetic fields and radio waves are absorbed by metal, it becomes difficult to communicate in any band.
If the frequency is 135 kHz or less, the magnetic field may be diffracted through the metal gap, and communication may be possible, but the communication distance becomes extremely short.
In the 13.56 MHz band, the current generated in the metal flows in a direction to cancel the magnetic field of the IC tag, so that the IC tag can hardly obtain an electromotive force.
In the case of the 2.45 GHz band, the antenna is out of tune and communication becomes impossible.
In addition, radio waves in the 2.45 GHz band are well absorbed by water, as used in microwave ovens, and therefore do not pass through the human body.
For this reason, if there is a metal or a person around the IC tag, the communication becomes unstable, and it becomes impossible to detect the presence of opening.

Since communication with an IC tag is unstable, for example, in Japanese Patent Application Laid-Open No. 2000-122552, as shown in FIG. 10, a seal seal 4 incorporating an electric circuit 41 that is divided by peeling is used, and a detector is connected thereto. Thus, a system for detecting the presence or absence of opening has been proposed.
However, if the connection terminal 42 is short-circuited with a copper wire or the like before the electric circuit 41 is divided, an equivalent closed circuit is formed between the connection terminals 42, so that no current flows through the electric circuit 41. The division cannot be detected. Therefore, the alarm is temporarily blocked.
Further, even if the seal seal 4 peeled off while being short-circuited is replaced with another, the current flow does not fluctuate, so that the seal seal 4 can be easily replaced without leaving any trace of opening.
JP 2000-57292 A JP 2000-122552 A

  The problems to be solved are as described above, and the present invention improves the circuit configuration of a seal seal that uses an electric circuit instead of a conventional IC tag, and can easily detect a short circuit or a replacement. It was made for the purpose of providing.

  Therefore, according to the present invention, resistors R1 and R2 having different resistance values for each system are arranged in the seal portion and the detection portion, and the seal portion and the detection portion are electrically connected to form a connection circuit of the resistors R1 and R2. A DC voltage Vcc is applied to both ends of the connection circuit, and the connection circuit is cut off when the seal portion is peeled off. A connection point potential Va of the resistors R1 and R2 is periodically applied to the detection unit. Measuring means for measuring, comparing means for comparing the measured connection point potential Va with the initial voltage V0 recorded in advance, determining means for determining normal if Va = V0 within a predetermined error range, and alarming the determination result The main feature is that it comprises transmission means for transmitting to a monitoring computer equipped with notification means.

In the present invention, a connection circuit of resistors R1 and R2 having different resistance values is formed for each system, the connection point potential Va is periodically measured and compared with the initial voltage V0, and if Va = V0, it is determined to be normal. To do. Therefore, when the seal portion is replaced, the resistance R1 naturally changes and Va ≠ V0. Therefore, the replacement of the seal portion can be easily detected with a simple circuit configuration.
Further, when the connection circuit is short-circuited, Va = 0, so that it is possible to easily detect a short-circuit of the connection circuit.

  Embodiments of the present invention will be described below.

FIG. 1 shows a configuration diagram of an unsealing detection system embodying the present invention.
The opening detection system includes a seal unit 1, a detection unit 2, and a server 3. Monitoring software is resident in the server 3 to perform regular communication with the detection unit 2, and whether the system is opened or removed. Is a mechanism for monitoring for 24 hours.
Communication is performed using an encrypted original protocol, which makes it difficult to eavesdrop and prevents impersonation due to replacement of the detection unit 2.
In addition, the detection unit 2 is molded and sealed, which makes it difficult to decode the circuits and components.
The detection unit 2 includes an A / D converter 21, a CPU 22, a memory 23, and a communication controller 24. The A / D converter 21 converts the signal voltage of the seal unit 1 into a digital value, and the CPU 22 periodically measures the signal voltage. The measured value is collated with the initial value stored in the memory 23, and if the difference is within the error range, it is determined as abnormal.
The determination result is transmitted to the server 3 via the communication controller 24, and if there is an abnormality in the determination result or communication, the server 3 notifies the alarm by means such as an alarm, an emergency light, an automatic notification to a mobile phone or mail.
Communication between the detection unit 2 and the server 3 is performed via a communication cable such as a USB, a telephone line, or a wireless line.

2 and 3 are a plan view and a cross-sectional view of the seal portion.
The seal unit 1 has a resistor R1 mounted on a thin substrate 11 formed of a resin film or the like, two-wire wirings 12 formed by printing or etching are connected to both ends, and the upper surface of the substrate 11 is covered with a surface seal 13 To do.
Further, the adhesive a is applied to the entire lower surface, and the lower surface is supported by the release paper 14 that has been subjected to a silicon peeling process.
The sealing portion 1 is peeled off from the release paper 14 and is attached to the boundary line of the opening / closing portion of the storage case or storage and sealed.
Several weak lines 15 formed by perforations perpendicular to the wiring 12 are put in the seal part 1, and when the seal part 1 affixed to the storage case or storage is peeled off, the weak line 15 is broken. Thus, the wiring 12 is cut off.

FIG. 4 shows a circuit diagram of a connection portion between the seal portion and the detection portion.
The connecting portion connects the seal portion 1 and the detection portion 2 at connection points A and B via a cable 4 such as a vinyl wire or a coated copper wire, and a series circuit including a resistance R1 of the seal portion 1 and a resistance R2 of the detection portion 2 Form.
The resistor R1 is a resistor that applies a signal voltage to the detector 2, and the resistor R2 is a pull-up load resistor that protects the input circuit of the detector 2 from an overcurrent during a short circuit.
This series circuit is connected to both ends of the DC power source E of the detection unit 2, and the potential Va at the connection point C between the resistors R1 and R2 is measured. The connection point potential Va is Vcc as the voltage of the DC power source E.
Va = Vcc × R1 / (R1 + R2).

The resistors R1 and R2 are mounted by randomly combining E24 series resistors from 1 KΩ to 1 MΩ at the time of manufacture. As a result, the resistance values of the resistors R1 and R2 become 73, and the combination C = n (n−1)... (N−r + 1) / r! Since n = 73 and r = 2, C = 73 × 72/2! = 2628.
Accordingly, there are 2628 possible values of the connection point potential Va at the time of manufacture, and it may be considered that the value is substantially unique for each individual system. For this reason, when the seal portion 1 is replaced, the resistance value of the resistor R1 fluctuates, so that it does not become the same connection point potential Va as before, and the initial voltage V0 recorded in the memory 23 as an initial value at the time of manufacture or factory shipment. Therefore, Va is not equal to V0, and replacement can be detected.
The initial voltage V0 is appropriately rewritten to the latest measured value according to an instruction from the server 3 in order to cope with aging.

Further, when the seal portion 1 forged for replacement is temporarily connected to the connection points A and B in a double manner, as shown in FIG. 5, when the resistance is R3, the parallel circuit of the resistors R1 and R3 Is formed.
Similarly, in order to decode the resistance of the seal portion 1 and forge the seal portion 1 having the same resistance value, when the resistance value is measured by applying a tester to the connection points A and B, the internal resistance of the tester is set to R3. Then, a parallel circuit of resistors R1 and R3 is formed.
Therefore, the connection point potential Va in this case is
Va = Vcc × R0 / (R0 + R2).
However, R0 = (R1 × R3) / (R1 + R3).
Also in this case, Va.noteq.V0, and double connection and resistance value measurement can be detected.

Further, when the seal portion 1 is peeled off and the wiring 12 is cut, separated from the cable 4, or disconnected, as shown in FIG. 6, the switch S considered to be replaced with the resistor R1 is in the OFF state. Thus, the resistance of the seal portion 1 becomes infinite.
Therefore, the connection point potential Va in this case is Va = Vcc.
Thereby, peeling of the seal part 1 can be detected.

Further, when the connection points A and B are short-circuited with a copper wire or the like so that the alarm is not activated, as shown in FIG. 7, the switch S which can be replaced with the resistor R1 is turned on, and the seal portion The resistance of 1 becomes 0.
Accordingly, the connection point potential Va in this case is Va = 0.
Thereby, the short circuit of the seal part 1 can be detected.

The connection point potential Va is repeatedly measured with an extremely short period of about 1 ms.
For this reason, fluctuations in the connection point potential Va due to short circuit, open, double connection, etc. of the seal portion 1 that occur at the time of replacement are always detected.
Therefore, even if the resistance of the seal portion 1 is decoded and the seal portion 1 having the same resistance value is forged, it is impossible to replace the seal portion 1 during monitoring of the system.

Next, processing of the detection unit will be described with reference to the flowchart of FIG.
First, in step 101, the CPU 22 determines whether a request signal from the server 3 has been received. If received, the process proceeds to step 109, and if not received, the process proceeds to step 102.
In step 102, the CPU 22 reads the connection point potential Va via the A / D converter 21, compares the connection point potential Va read in the next step 103 with the initial voltage V0 stored in the memory 23, and the difference is predetermined. If it is within the error range, it is determined as normal and the process returns to step 101. If it is outside the error range, it is determined that there is an abnormality, and the routine proceeds to step 104.
In step 104, it is determined whether Va = Vcc. If Va = Vcc, the process proceeds to step 105. If Va ≠ Vcc, the process proceeds to step 106.
In step 105, error code = E1 is set in the memory 23, and the process returns to step 101.
In step 106, it is determined whether Va = 0. If Va = 0, the process proceeds to step 107, and if Va ≠ 0, the process proceeds to step 108.
In step 107, error code = E2 is set in the memory 23, and the process returns to step 101.
In step 108, error code = E3 is set in the memory 23, and the process returns to step 101.
In step 109, it is determined whether or not an error code is set in the memory 23. If it is set, the process proceeds to step 110. If it is not set, the process proceeds to step 111.
In step 110, an abnormal signal including an error code is returned to the server 3, and the process returns to step 101.
In step 111, a normal signal is returned to the server 3, and the process returns to step 101.

Next, server processing will be described with reference to the flowchart of FIG.
First, in step 201, it is determined whether or not a certain time has elapsed. If the certain time has elapsed, the process proceeds to step 202. If the certain time has not elapsed, the process returns to step 201.
In step 202, a request signal is transmitted to the detection unit 2, and in the next step 203, it is determined whether or not there is a response from the detection unit 2. If there is a response, the process proceeds to step 204, and if there is no response, the process proceeds to step 210.
In step 204, it is determined whether or not the response is normal. If normal, the process returns to step 201, and if abnormal, the process proceeds to step 205.
In step 205, it is determined whether or not error code = E1. If error code = E1, the process proceeds to step 206. If error code ≠ E1, the process proceeds to step 207.
In step 206, an alarm of “seal peeling” is notified and the process is terminated.
In step 207, it is determined whether or not error code = E2. If error code = E2, the process proceeds to step 208, and if error code ≠ E2, the process proceeds to step 209.
In step 208, an alarm “seal short circuit” is notified and the process is terminated.
In step 209, an alarm “seal replacement (or there is a risk)” is notified and the process is terminated.
In step 210, an alarm of “system removal” is notified and the process is terminated.

It is a block diagram of the opening detection system which implemented this invention. It is a top view of a seal part. FIG. 3 is a cross-sectional view of FIG. 2. It is a circuit diagram of the connection part of a seal part and a detection part. It is a circuit diagram of the connection part at the time of double connection. It is a circuit diagram of the connection part at the time of a short circuit. It is a circuit diagram of the connection part at the time of open | release. It is a flowchart of a process of a detection part. It is a flowchart of a process of a server. It is a circuit diagram of the conventional seal part.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Seal part 11 Board | substrate 12 Wiring 13 Surface seal 14 Release paper 15 Weak line 2 Detection part 21 A / D converter 22 CPU
23 Memory 24 Communication Controller 3 Server 4 Sealing Seal 41 Electric Circuit 42 Connection Terminal A, B Connection Point R Resistance a Adhesive

Claims (10)

Resistors R1 and R2 having different resistance values for each system are arranged in the seal part and the detection part,
The seal part and the detection part are electrically connected to form a connection circuit of the resistors R1 and R2,
While applying a DC voltage Vcc across the connection circuit,
When this connection circuit peels off the seal part, it is cut off,
In the detection unit,
Measuring means for periodically measuring the connection point potential Va of the resistors R1 and R2,
A comparison means for comparing the measured connection point potential Va with the initial voltage V0 recorded in advance;
Determination means for determining normal if Va = V0 within a predetermined error range;
Transmitting means for transmitting the determination result to a monitoring computer provided with alarm notification means;
An opening detection system characterized by comprising:   The opening detection system according to claim 1, wherein several weak lines perpendicular to the connection circuit are put in the seal portion.   2. The unsealing detection system according to claim 1, wherein the resistors R1 and R2 are obtained by randomly extracting two types from predetermined series resistors.   2. The opening detection system according to claim 1, wherein the initial voltage V0 is obtained by recording a connection point potential Va measured at the time of manufacture or factory shipment.   2. The opening detection system according to claim 1, wherein the initial voltage V0 is updated to the latest measured value as needed to cope with aging.   The opening detection system according to claim 1, wherein the detection unit is sealed by molding so as to make the reading difficult.   2. The unsealing detection system according to claim 1, wherein said transmission means communicates using a secret protocol encrypted to make eavesdropping difficult.   2. The unsealing detection system according to claim 1, wherein the determination means determines that the seal portion has been peeled off when the connection point potential Va = Vcc.   2. The unsealing detection system according to claim 1, wherein the determination means determines that the seal portion has been replaced when the connection point potential Va is not equal to V0.   2. The unsealing detection system according to claim 1, wherein the determination means determines that the connection circuit is short-circuited when the connection point potential Va = 0.

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