JPH07306987A - System for preventing unauthorized lending of article - Google Patents

Abstract

PURPOSE:To provide the system for preventing the unauthorized lending of articles such as 'secret' in business by using a resonance circuit which is resonated with the specific frequency radio wave. CONSTITUTION:The resonance tag comprising the resonance circuit which is resonated with the specific frequency radio wave is mounted on the commodity arranged in a room (a), such as, documents, floppies, CD-ROM, and files corresponding to 'secret' in business in the office and if it is accidentaly or erroneously carried away, a detection device 7 detects the lending thereof from a room (a) when it passes near the partitions C and D, wall A, and door H wherein the detection device 7 is embedded by sending the radio wave of the specific frequency for the resonance tag. Thus, the unauthorized lending of articles can be prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an anti-theft system, and more particularly, it utilizes a resonance device such as a resonance tag which constitutes a resonance circuit that resonates with a radio wave of a specific frequency, for example, as a "trade secret in a company office. ", Etc., and a system for preventing unauthorized access of articles.

[0002]

2. Description of the Related Art In recent years, interest in so-called "trade secrets" and the need for protection have increased. But,
At present, there is nothing that can be the decisive factor for the concrete prevention of leakage of "trade secrets" and the prevention of fraud. Note that this "trade secret" is generally one that is not publicly known as technically or business advantageous information that is managed as a secret, and specifically, a design drawing, "Technical information" such as research reports, or "sales information" such as customer lists, sales manuals, market research information, financial data, etc.
Etc.

However, how strictly they are managed,
Even if it is stored, as long as there is a person who intends to leak and tamper it with a clear intention, it will be a cat-and-mouse game, and the equipment for strict management and strict storage may be enormously expensive.

In addition, the "trade secret" is always used in some form in the company, and in that sense, the means and method for defending against the injustice of human beings in the company are currently under way. There is not enough.

By the way, in recent years, in department stores, discount stores, video rental stores, CD shops, etc., JP-A-1-129396 and JP-A-1-27779.
Non-contact ID tag (resonance tag) disclosed in Japanese Patent Publication No. 1
A system that is used to prevent shoplifting by attaching to a product is used. This resonance tag is processed as unusable when paying at the cash register, but the customer did not pay the price, and the specific detection device installed at the entrance of the store etc. with the resonance tag attached to the product. When you pass through a gate equipped with, a warning is given by an alarm or lamp.

[0006]

However, if such a conventional shoplifting prevention system is to be used as it is for the above-mentioned "trade secret" fraudulent carding prevention system,
There are the following problems. In other words, in the conventional system, the antenna of the gate detection device installed at the entrance of the store, etc. is visible from the outside, so this is simply applied to the unauthorized access prevention system in the office. Then, if you accidentally or intentionally take out a "trade secret" such as prohibition of taking out, you will easily notice that it is managed by the person himself, and you will see the contents of the trade secret before going through the gate. By returning to
In some cases, fraudulent disclosure of trade secrets may occur.

In view of the conventional problems as described above, the present invention utilizes a resonance circuit that resonates with a radio wave of a specific frequency so that a company or the like improperly issues an article such as a "trade secret". An object is to provide a system that can be more reliably prevented.

[0008]

In order to achieve such an object, the unauthorized banding prevention system of the present invention provides a resonance device forming a resonance circuit that resonates with a radio wave of a specific frequency in a room or a wall partitioned by a wall. A detection device that is attached to an article arranged in an enclosed room and detects the banding of the article from the room by transmitting a radio wave of the specific frequency to the resonance device is provided in the room. It is characterized by being buried in the wall near the doorway.

The partition of the present invention is a partition used as a wall of an unauthorized access prevention system, in which the article is placed by transmitting a radio wave of a specific frequency to a resonance device mounted on the article. It is characterized in that a detection device for detecting the banding from the room is buried.

[0010]

In the invention according to claim 1, a resonance device forming a resonance circuit that resonates with a radio wave of a specific frequency, for example,
The resonance tag according to the invention of claim 2 is attached to an article placed in a room, for example, a document, floppy, CDROM, file, etc. that can be taken out, which corresponds to a "trade secret" in an office. Keep it.

On the other hand, a detection device for detecting the banding of the article from the room by transmitting a radio wave of a specific frequency to the resonance device is embedded in the wall near the doorway of the room. In the present specification, “wall” includes not only ordinary walls but also partitions and doors.

Therefore, the documents, floppy, CD
If you intentionally or mistakenly try to take out the ROM, files, etc. while knowing that they are “trade secrets”, the detection device can detect this when you pass by a wall such as a partition in which the detection device is embedded. It is possible to prevent unauthorized access.

In this case, since the detection device is buried in the wall, when the "trade secret" such as the prohibition of taking out is mistakenly or intentionally taken out, the person is aware in advance that it is managed. Never.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the accompanying drawings. FIG. 1 shows the inside of an office of a company or the like to which the unauthorized access prevention system for articles according to the first aspect of the invention is applied. A room B surrounded by a normal wall A is provided in the office, and the room B is further partitioned into two rooms a and b by partitions C and D as walls.

A cabinet E is provided in the room a, and the cabinet E accommodates articles such as documents, floppies, CDROMs, and files that can be taken out, which correspond to "trade secrets". Here, a resonance device that constitutes a resonance circuit that resonates with a radio wave of a specific frequency is attached to the article.

Further, the detection device 7 for detecting the take-out of the article from the room a by transmitting the radio wave of the specific frequency to the resonance device is a partition C or D near the entrance F of the room a. Alternatively, the detection device 7 for detecting the discharge of the article from the room b is embedded in the normal wall A or the door H near the doorway G of the room b.
As the partitions C, D, and doors H, special ones in which the detection device 7 is embedded are prepared in advance and used.

The construction of one embodiment of the resonance device will be described with reference to FIGS. That is, a resonance tag 1 as a resonance device uses a polyolefin resin film such as polyethylene or another synthetic resin film 2 as a dielectric, and both sides of the resin film (dielectric) 2 are provided with a metal foil 3 such as an aluminum foil. , 4 are bonded together by a method such as extrusion or thermocompression bonding to produce a substrate material.

Of the metal foils 3 and 4 attached to both surfaces of the resin film 2 as the dielectric, the metal foil 3 on one side is a circuit having a spiral pattern, and a coil is formed by the spiral pattern. In addition, it is used as a circuit having a capacitor electrode plate portion 3A and a circuit terminal portion 3B at both ends, and the metal foil 4 on the opposite side of the metal foil 3 is a circuit having a capacitor electrode plate 4A and a circuit terminal portion 4B. used.

In order to obtain a specific resonance frequency, a "resonance frequency circuit" is printed on both surfaces of the above-mentioned substrate material, that is, on the metal foils 3 and 4 by using an ink having etching resistance by various printing methods. Then, a chemical solution such as an acid or an alkali is used to perform a chemical etching process to form a resonance frequency circuit.

Here, in the present embodiment, the circuit terminal portion 3B in the spiral pattern circuit of the metal foil 3 on one side and the circuit terminal portion 4B of the metal foil 4 on the opposite side are connected, but they are not always conductive. You don't have to.

The connection method is a so-called pressure welding method in which both metal foils 3 and 4 are crushed vertically by a hard substance having a rough surface. By this pressure contact, the resin film 2 between the metal foils 3 and 4 is destroyed, and the metal foils 3 and 4 are electrically connected and short-circuited. By this short circuit, a resonance frequency circuit composed of three elements of a resistance R, an inductance L and an electrostatic capacity (capacitor capacity) C is formed.

The equivalent circuit of this resonance frequency circuit is as shown in FIG. 4. The metal foils 3 and 4 form a capacitor capacitance, and the resistance is formed by the resistance of the metal foils 3 and 4 themselves. The resonance frequency f of this equivalent circuit is f = 1 / {2π√ (LC)}
Therefore, when a signal of this frequency is given from the detection device 7, it resonates and its presence is detected.

Next, the structure of the detection device 7 will be described with reference to FIG. The detection device 7 includes an antenna unit 8 and a signal processing unit 9. The antenna section 8 is a transmission antenna circuit 8a that emits a radio wave having a target frequency.
And a reception antenna circuit 8b for receiving the radio wave from the transmission antenna and the resonance frequency of the resonance tag. The signal processing unit 9 includes an oscillation circuit 9a that oscillates a frequency matching the resonance frequency of the resonance tag, a transmission amplification circuit 9b that amplifies a signal from the oscillation circuit 9a, and an electric wave of an unnecessary frequency band in the transmission amplification circuit 9b. And a transmission filter circuit 9c for transmitting a signal to the transmission antenna circuit 8a. Further, the signal processing unit 9 includes a first reception filter circuit 9d that removes radio waves in an unnecessary frequency band from radio waves received from the receiving antenna, a reception amplification circuit 9e, and a second radio wave that removes radio waves in an unnecessary frequency band again. Reception filter circuit 9f of
A detection circuit 9g for detecting the high frequency component of the resonance tag included in the high frequency signal output from the second reception filter circuit 9f into a low frequency signal, the detected tag signal is input to the microprocessor IC, and the actual A control circuit 9h that determines whether or not a tag waveform is output, a lamp, an alarm, a video camera, etc. are set, and as an alarm means that issues a warning by light, sound, visual, etc. according to the output signal from the control circuit 9h. It has a first warning circuit 9i.

Further, in this embodiment, when the operation of the device becomes unstable for some reason as the control circuit 9h,
For example, the one having a function of confirming and outputting the case where the output of the primary power source 10 to the antenna unit 8 and the signal processing unit 9 is cut off and the received radio wave cannot be caught is used. Further, the signal processing unit 9 is provided with a secondary power supply circuit 9k which operates when the primary power supply 10 is cut off for some reason and outputs the control circuit 9h and the wireless transmission circuit 9j. The wireless transmission circuit 9j activates the second warning circuit 11 that is an alarm means that is provided in a security room apart from the place where the detection device 7 is installed or is carried by a security guard. The second warning circuit 11 is operated by receiving a radio wave from the wireless transmission circuit 9j by the wireless reception circuit 12.

Further, the control circuit 9 of the detection device 7 of this embodiment
h is a frequency switching signal if necessary,
a, the first reception filter circuit 9d, and the second reception filter circuit 9f may be output. This allows
In the oscillator circuit 9a, the frequency is changed so that each filter circuit 9a
With d and 9f, the filter is switched to a required frequency band, and a multi-frequency resonant tag can be detected.

Next, the operation of such a system will be described. Items placed in room a, such as documents, floppies, CDs similar to "trade secrets" in the office
A ROM, a file, or the like that can be taken out is equipped with a resonance tag 1 that constitutes a resonance circuit that resonates with a radio wave of a specific frequency.
If you intentionally or mistakenly try to take out M, files, etc. while knowing that they are “trade secrets”, when you pass by the partitions C and D in which the detection device 7 is embedded, the wall A, and the door H, the detection device 7 is detected. By detecting this, it is possible to prevent fraudulent output.

In this case, in the above embodiment, the receiving antenna circuit 8b of the detecting device 7 which is transmitted from the resonance tag 1 is transmitted.
The first warning circuit 9 according to the resonance frequency received by
i and / or the alarm of the second warning circuit 11 or a warning by a lamp or the like is issued. It should be noted that, as described above, the alarm, the lamp, and the like, which are the alarm means, have the first warning circuit 9i
As an alternative, the second warning circuit 11 may be provided in the office or provided in a security room or carried by a security guard so that the unauthorized access can be detected.

According to such a system, the detecting device 7 is
A wall near the doorway of the room, such as partition C,
D, because it is embedded in the normal wall A and the door H, it is managed by the person in advance when the "trade secret" such as the prohibition of taking out is mistakenly or intentionally taken out as described above. You won't notice it. In particular, if the above-mentioned second warning circuit 11 makes it possible to detect the illegal access, the person himself / herself can be informed that he / she intends to take it out without noticing that it is completely managed. .

In the above embodiment, the so-called single-sided coil type resonance tag 1 is exemplified as the resonance device, but the resonance tag shown in FIGS. 6 to 9 can be used as the resonance tag. This resonance tag 20 is a circuit having a spiral pattern composed of metal foils 22 and 23 on both sides of a resin film 21 serving as a dielectric. A coil is formed by the spiral pattern and the spiral pattern is substantially formed. This is a configuration in which a capacitor electrode plate portion is configured as a whole and a circuit having circuit terminal portions 22A and 23A is provided at one end portion to form a resonance frequency circuit. This resonance circuit may be used as it is, but at an appropriate position in the spiral pattern circuit of the metal foil 22 on one side, for example, at the circuit terminal portion 22A and an appropriate position in the spiral pattern circuit of the metal foil 23 on the opposite side, For example, the circuit terminal portion 23A may be conductively connected.

The equivalent circuit of the resonance circuit when the metal foils 22A and 23A are not conducted is as shown in FIG.
2, 23 and the resin film 21 form a capacitor capacitance, and the resistance is formed by the resistance of the metal foils 22, 23 themselves. The resonance circuit of this equivalent circuit is f = √2 / {2
π√ (LC)}, and when a signal of this frequency is given from the detection device of the gate, it resonates and its existence is detected.

Further, the equivalent circuit of the resonance circuit of the resonance tag 20 in which the metal foils 22 and 23 are made conductive is as shown in FIG. 9, and the resonance frequency of this equivalent circuit is f = 1 / {2π√
(2LC)}, and a resonance frequency that is about half that of the case where no conduction is made is obtained.

According to the resonance tag 20 having the above-mentioned structure, since it is a double-sided coil type, even when the size of the resonance tag 20 is limited to a small size, compared with the single-sided coil type resonance tag,
The size of the coil and the capacitor is not limited, it is possible to form a low frequency type, and there are few restrictions when expanding the variable range of the frequency, which is advantageous in terms of performance.

The fraudulent discharge preventing system of the present invention is not limited to the above-mentioned embodiment. For example,
If the configuration is such that the signal from the above-mentioned detection device embedded in the wall can be transmitted to the management computer or the like, the computer can manage the history such as the number of unauthorized access and the date and time.

[0034]

As described above, according to the unauthorized access prevention system of the present invention, an article placed in a room, for example, a document, a floppy disk, a CDROM, a file similar to a "trade secret" in an office. It is possible to prevent unauthorized access such as, in particular, because the detection device is embedded in the wall near the entrance / exit of the room, such as a partition, a normal wall, or a door. Never be When the resonance tag is used as the resonance device, the resonance device is easily attached to an article and is advantageous in handling.

[Brief description of drawings]

FIG. 1 is a perspective perspective view showing the inside of an office of a company or the like to which the unauthorized access prevention system for articles according to the invention of claim 1 is applied.

FIG. 2 is an exploded perspective view showing a configuration of a resonance tag according to the above embodiment.

FIG. 3 is a sectional view of the above resonance tag.

FIG. 4 is a circuit diagram showing an LCR circuit of the above resonance tag.

FIG. 5 is a block diagram showing a configuration of a detection device according to the embodiment.

FIG. 6 is an exploded perspective view showing the configuration of another example of the resonance tag.

FIG. 7 is a sectional view of the above resonance tag.

FIG. 8: Equivalent circuit of the resonance circuit of the above resonance tag when the metal foil is not conducted

FIG. 9: Equivalent circuit of resonant circuit of resonant tag same as above when conducting metal foil

[Explanation of symbols]

 1 Resonance tag 7 Detection device 20 Resonance tag A Wall B Room C Partition D Partition H Door a Room b Room

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hiroo Sugihara 450 Takayacho, Ihara, Okayama Prefecture Takaya Co., Ltd. (72) Inventor Yoshio Maruyama 8-6 Nibashi Kobunecho, Chuo-ku, Tokyo Sanki Engineering Co., Ltd.

Claims (4)

[Claims] 1. A resonance device, which constitutes a resonance circuit that resonates with a radio wave of a specific frequency, is attached to an article placed in a room partitioned by a wall or a room surrounded by the wall, and the resonance device is mounted on the resonance device. An unauthorized access control system for articles, wherein a detection device for detecting the access of the article from the room by transmitting radio waves of the specific frequency is embedded in a wall near the doorway of the room. 2. The circuit according to claim 1, wherein the resonance device is formed of metal foil to form a coil, and has a spiral pattern circuit having a capacitor electrode plate portion and a circuit terminal portion, and a circuit of metal foil having the spiral pattern. The unauthorized tag protection system according to claim 1, wherein the resonance tag is configured by including a circuit that is laminated with or without a resin film that serves as a dielectric and that includes a capacitor electrode portion and a circuit terminal portion. . 3. The resonance device is configured by laminating two circuits in a spiral pattern made of metal foil with or without a resin film as a dielectric being interposed therebetween, and a coil is formed by the spiral pattern. The unauthorized taping prevention system according to claim 1, wherein the resonance tag is a resonance tag which is configured by forming a capacitor electrode plate portion by substantially the entire spiral pattern and providing a circuit having a circuit terminal portion at one end portion. 4. A partition used as a wall of the unauthorized access prevention system according to claim 1, wherein a radio wave of a specific frequency is transmitted to a resonance device mounted on an article. According to the above, a partitioning device is embedded in which a detection device for detecting the banding from the room in which the article is placed is embedded.