JPH0744778A - Passivatable resonance label - Google Patents

Abstract

PURPOSE:To provide a passivatable resonance label which is of simple configuration, and simultaneously, is easy to manufacture, and in addition, in which a passivation test can be executed. CONSTITUTION:In a resonance label, an oscillation circuit is formed of two capacitor parts C1, C2 formed of capacitor plates 21, 22, 23, 24 on both the faces of an insulating carrier layer 10 and an induction coil 30. The first capacitor part C1 is provided with a dielectric breakdown part 50 which can be short- circuited because a conductive part 65 is generated by the impression of the electromagnetic wave of frequency coincident with the resonance frequency of the oscillation circuit having sufficiently large energy. This dielectric breakdown part 50 is formed by bringing the capacitor plates 21 and 23 into contact with each other at a window part formed in the carrier layer 10 so as to pass through it. Thus, the passivation test can be executed, and the passivation confidence coefficient of the resonance label is improved drastically, and the fall of the reliability of the customer of a retail store due to malfunction can be prevented. Besides, such the resonance label can be provided inexpensively.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a deactivating resonance label provided with a vibration circuit for electromagnetic waves, for example, a resonance label attached to a product or the like for the purpose of preventing theft.

[0002]

2. Description of the Related Art Conventionally, a resonance label for theft prevention is attached to a product for the purpose of preventing the product from being illegally or erroneously taken out from a retail store or the like. Generally, when a product with the resonance label attached thereto is illegally taken out of the store, an alarm device installed in the store is activated to give an alarm. Therefore, it is necessary to deactivate the resonance label so that the alarm does not sound when the product is legally taken out through the register (cashier). Therefore, the resonance label is provided with a means capable of being inactivated.

In a conventional general resonance label, an insulating carrier layer is sandwiched between capacitor plates made of a pair of conductors to form a capacitor portion, and the capacitor portion is formed on one surface of the carrier layer. A vibration circuit is configured by electrically connecting the induction coil. When deactivating the resonance label, a large voltage is applied between both capacitor plates by applying to the resonance label an electromagnetic wave having a sufficiently large energy with a frequency matching the resonance frequency of the vibrating circuit. , By doing so, both capacitor plates are short-circuited to invalidate the vibration circuit.

In view of the fact that the purpose of using such a resonance label is mainly to prevent theft, before the resonance label is attached to an actual product, the dielectric breakdown of the capacitor portion as described above when passing through the register. You need to make sure that happens. That is, the resonance label inactivation test must be performed in advance. However, as described above, once inactivated, the capacitor portion is destroyed, so that it is impossible to operate it again as it is during actual use, and it becomes impossible to use it as a product.

Therefore, for example, a resonance label has been proposed in which a target-dielectric breakdown site is formed by bringing both capacitor plates close to a part of the capacitor part with an extremely small gap of 0.1 to 1 μm (special feature). Front flat 4-
505820). According to this proposal, discharge occurs at the target-dielectric breakdown site during inactivation, and the conductor (metal) that forms the capacitor plate and vaporization and deposition of the conductor (metal) form filamentous metal conductors between the capacitor plates. , Surely a short circuit will occur.

[0006]

However, the present inventors have revealed that the resonance label described in Japanese Patent Publication No. 4-505820 has the following problems. That is, the distance between both capacitor plates at the target-dielectric breakdown site is 0.1 to 1 μm.
In order to obtain m, it is necessary to perform processing accurately using a laser or the like, which complicates the process and significantly increases the manufacturing cost.

If the processing accuracy is relaxed in order to reduce the manufacturing cost, the distance between both capacitor plates may vary in each label, and a label that is not inactivated may be manufactured. Therefore, the inactivation test must be performed in advance.

To regenerate a label that has been inactivated,
A method is considered in which a current is applied to the thread-shaped metal conductor described above to evaporate the thread-shaped conductor to cut it, but even if a voltage is applied to both ends of the thread-shaped conductor, the current only flows to the induction coil side and Does not flow and the filamentary conductor cannot be cut. In order to pass a sufficient current to the filamentous conductor to evaporate the filamentous conductor, it is necessary to cut off the current path between the filamentous conductor and the induction coil, and the number of steps increases significantly due to such cutting and reconnection of the cut point, There is a drawback that the manufacturing cost becomes high.

As another method, it is conceivable to mechanically apply a stress to the label to cut the above-mentioned thread-shaped metal conductor, but the target-dielectric breakdown site is deformed and cannot be inactivated again. There is a drawback that it may become. In other words, a resonance label that has a simple structure, is easy to manufacture, and can perform an inactivation test has not yet been realized,
The realization was desired.

The present invention has been made in view of the above-mentioned points, and an object of the present invention is to provide an inactivating resonance label which has a simple structure, is easy to manufacture, and can carry out an inactivation test. To provide.

[0011]

In order to achieve the above object, in the inactivating resonance label according to the present invention,
At least one induction coil is provided on one surface of the insulating carrier layer, and the first capacitor plate electrically connected to one end of the induction coil and the other end of the induction coil are electrically connected. And a third capacitor plate and a fourth capacitor plate on the other surface of the carrier layer facing the first and second capacitor plates, respectively, with the carrier layer interposed therebetween. A resonance label formed by electrically connecting the third and fourth capacitor plates to each other, wherein the capacitor label is formed by at least the first and third capacitor plates. The carrier layer is provided with at least one window portion penetrating the carrier layer, and the first and third components are provided in the window portion. The emission Sir plate characterized by comprising adhered with an insulating adhesive.

[0012]

According to the above means, in the condenser portion formed by the first and third condenser plates, both condenser plates are bonded by the adhesive through the window portion provided in the carrier layer, so that the resonance occurs. By applying to the resonant label an electromagnetic wave having a sufficiently large energy with a frequency matching the resonant frequency of the label's vibrating circuit, a discharge occurs between the capacitor plates at the window. Then, the discharge causes the evaporation of the conductor (metal) that forms the capacitor plate and the deposition thereof, so that both capacitor plates are short-circuited. As a result, the vibration circuit of the resonance label becomes a circuit composed of the capacitor section formed by the second and fourth capacitor plates and the induction coil, and the resonance frequency thereof is largely shifted to the low frequency side, and the resonance label is unsatisfactory. Be activated.

Further, as described above, since the condenser portion including the second and fourth condenser plates is provided in addition to the condenser portion including the first and third condenser plates, the resonance test is performed by performing the inactivation test. Even if the label is inactivated once, the oscillating circuit composed of the capacitor section composed of the second and fourth capacitor plates and the induction coil remains open as a DC circuit. Therefore, by applying a voltage (either direct current or alternating current) to the dielectrically damaged capacitor part after it has been inactivated, current will flow in the short-circuited part of the capacitor part,
As a result, heat is generated at the short-circuited portion, the conductor causing the short-circuit is vaporized, and the resonance label is reproduced.

Alternatively, by applying to the resonance label an electromagnetic wave having a frequency matching the resonance frequency of the vibrating circuit composed of the capacitor section composed of the second and fourth capacitor plates and the induction coil, a current is applied to the vibrating circuit. Flowing. That is, a current can be passed through the short-circuited portion, and the resonance label is reproduced as described above.

[0015]

EXAMPLE An example of a resonance label according to the present invention will be described below with reference to FIGS. 1 to 3 show an example of a resonance label according to the present invention, FIG. 1 is a top view thereof, FIG. 2 is a bottom view thereof, and FIG. 3 is a longitudinal sectional view thereof. As shown in FIGS. 1 and 3, the resonance label 1 includes, for example, a third capacitor plate 23 and a fourth capacitor plate 24 laminated on an upper surface 10a of an insulating carrier layer 10, respectively, while FIG. As shown in FIG. 3, a first capacitor plate 21 and a second capacitor plate 22 are laminated on the lower surface 10b of the carrier layer 10, respectively.

Each of these condenser plates 21, 2
Each of 2, 23, and 24 has conductivity, and is not particularly limited, but is formed of, for example, an aluminum foil.
The first capacitor plate 21 and the third capacitor plate 23 are provided so as to face each other with the carrier layer 10 in between, and the first capacitor portion C1 (its capacitance value is C ₁ ). I am configuring. Similarly, the second capacitor plate 22 and the fourth capacitor plate 24 are provided so as to face each other with the carrier layer 10 in between, and the second capacitor portion C2 (its capacitance value is C ₂ ).
Are configured.

An induction coil 30 (whose inductance is L) is formed on the lower surface 10b of the carrier layer 10. One end of the coil 30 is formed on the first capacitor plate 21 and the other side of the coil 30 is formed. The ends are electrically connected to the second capacitor plate 22, respectively.
On the other hand, the third and fourth condenser plates 23 and 2
4 are electrically connected by a bridge conductor 40.
Therefore, in the resonance label 1, the vibration circuit is a circuit in which the induction coil 30 is connected in parallel to a virtual capacitor having a combined capacitance value C formed by connecting two capacitors C1 and C2 in series. Here, the resonance frequency f _{0 of the} vibration circuit and the combined capacitance value C are expressed by equations (1) and (2), respectively. f ₀ = 1 / 2π√ (L · C) (1) C = 1 / (1 / C ₁ + 1 / C ₂ ) (2)

Further, the first capacitor portion C1 is not particularly limited in the number of dielectric breakdown portions 50 which can be short-circuited by applying an electromagnetic wave having a sufficiently large energy having a frequency matching the resonance frequency of the vibration circuit. Are provided at two locations, for example. This dielectric breakdown part 50 is shown in FIG.
As shown in the enlarged view of FIG.
The capacitor plate 21 and the third capacitor plate 23 are adhered via the adhesive layers 60 and 61.

Here, at least one of the adhesive layers 60 and 61 has an insulating property, and is, for example, a urethane adhesive. That is, also in the insulation breakdown portion 50, the first and third capacitor plates 21 and 23 are insulated from each other in the non-inactivated state. Then, the presence of the resonance label 1 is detected by the security system by applying an electromagnetic wave having normal energy having a frequency matching the resonance frequency of the vibration circuit. That is, it is detected by a detection device or the like of the resonance label 1 which is not inactivated and is installed at the exit of a store or the like. Needless to say, the resonance label 1 is not inactivated by electromagnetic waves of normal energy.

The resonance label 1 configured as described above is manufactured, for example, as follows. That is, first, the window portion 11 is opened in the carrier layer 10 by punching or the like. Next, an aluminum foil having no pattern is adhered to the lower surface 10b and the upper surface 10a of the carrier layer 10 via the adhesive layers 60 and 61, respectively. At that time, the adhesive layers 60 and 61 are adhered to each other in the window portion 11 without a gap. Then, a photoresist (photosensitive resin) is further applied to the attached lower layer aluminum foil, and the first and second capacitor plates 2 are formed by a photolithography technique.
The patterns of 1 and 22 and the induction coil 30 are transferred, and the patterns are formed on the aluminum foil by etching. On the other hand, similarly, the pattern of the third and fourth capacitor plates 23 and 24 and the bridging conductor 40 is formed on the upper aluminum foil by the photolithography technique and etching. The resonance label 1 is completed by the above procedure.

The resonance label 1 having the above-described structure is inactivated through the following process. By applying to the resonance label 1 an electromagnetic wave having a sufficiently large energy with a frequency matching the resonance frequency of the vibration circuit of the resonance label 1,
In the dielectric breakdown section 50 of the first capacitor section C1,
Discharge occurs between the first and third capacitor plates 21 and 23. The discharge partially evaporates the metal forming the capacitor plates 21 and 23.
The evaporated metal is deposited again, as shown in FIG.
The deposited minute conductive portions 65 electrically connect the two capacitor plates 21 and 23, resulting in a short circuit. As a result, the vibration circuit of the resonance label 1 has the second
The circuit is composed of the capacitor section C2 and the induction coil 30.

Therefore, as is clear from the above equations (1) and (2), the resonance frequency is largely shifted to the low frequency side, and the resonance label 1 is inactivated. The total thickness of the two adhesive layers 60 and 61 is
In consideration of the actual usage of the resonance label 1, the resonance label 1 is not particularly limited as long as it can generate a discharge between the first and third capacitor plates 21 and 23 in the air. It is about the degree or thinner.

The inactivated resonance label 1 is regenerated as follows. That is, both capacitor plates 21 and 23 of the first capacitor section C1 that has been dielectrically destroyed
DC or AC voltage is applied between them. In the case of DC voltage, the oscillating circuit composed of the second capacitor section C2 and the induction coil 30 is an open circuit in which the current path is cut off in the second capacitor section C2, so that the current is induced by the applied electric field. The current does not flow into the coil 30, but flows through the conductive portion 65 of the dielectric breakdown portion 50. Even in the case of an AC voltage, if the frequency is sufficiently lower than the resonance frequency, there is the second capacitor section C2, so the circuit on the induction coil 30 side is in an open state as a circuit. Therefore, it is natural that a current flows through the conducting portion 65.

As a result, Joule heat is generated in the conducting portion 65, the conducting portion 65 evaporates, and the first condenser portion C1 becomes effective again as a condenser of the capacitance C ₁ . Therefore, the vibration circuit of the resonance label 1 becomes a circuit having the same resonance frequency as before the inactivation, and the resonance label 1 is reproduced.

In addition to the above-mentioned reproduction method, an electromagnetic wave having a frequency matching the resonance frequency of the circuit is applied to an oscillating circuit composed of the second capacitor section C2 and the induction coil 30 to resonate the same. Electric current can be passed through the vibration circuit. Therefore, an electric current also flows through the conducting portion 65, and the conducting portion 65 is evaporated by the generated Joule heat to reproduce the resonance label 1.

According to the above-described embodiment, not only the inactivation and the regeneration thereof can be performed as described above, but also the window 11 can be formed very easily by punching holes. Therefore, a resonance label capable of performing an inactivation test can be realized with a simple structure and with good productivity.

Further, even if the first label C1 is dielectrically broken down to inactivate the resonance label 1, the vibration circuit including the second capacitor C2 and the induction coil 30 is effective. Therefore, the first and second condenser parts C1,
The resonance label 1 is detected by the resonance frequency of the vibration circuit composed of C2 and the induction coil 30, and then the first capacitor part C1 is subjected to dielectric breakdown, whereby the vibration composed of the second capacitor part C2 and the induction coil 30 is detected. This resonant label 1 can be detected again by the resonant frequency of the circuit. Therefore, new applications using such two-step detection are possible. For example, it is suitable for application to a system in which it is necessary to confirm the passage route of articles and the like.

In the above embodiment, the vibration circuit of the resonance label 1 is composed of the two capacitor parts C1 and C2 and the one induction coil 30, but three or more capacitor parts are provided. Alternatively, two or more induction coils may be provided. Also, the window 11
The number may be one or three or more. Furthermore, the first
The capacitor plate 21, the second capacitor plate 22, and the induction coil 30 may be integrally formed, or may be separately formed and integrated. Third condenser plate 23 and fourth condenser plate 24
Similarly, the bridging conductor 40 and the bridging conductor 40 may be integrated in advance or may be integrated afterwards.

[0029]

In the deactivating resonance label according to the present invention, the vibrating circuit is composed of two capacitor parts and an induction coil, and only one of the capacitor parts is dielectrically broken down by the electromagnetic wave. Since it is possible, it is possible to inactivate the resonance label by short-circuiting between the pair of capacitor plates that make up the capacitor part by dielectric breakdown of the capacitor part, and the capacitor that has been dielectrically damaged. By applying a voltage to the portion, the short-circuited portion can be evaporated and eliminated, and the resonance label can be easily reproduced. Therefore, since the inactivation test can be performed on this resonance label, the inactivation reliability rate of the resonance label is significantly improved, and it is possible to prevent a decrease in the trust of the retail store customer due to a malfunction.

Further, in order to bring the pair of capacitor plates close to each other to the extent that dielectric breakdown may occur, it is sufficient to form a window portion penetrating the carrier layer, and the size of the window portion is strictly defined. Since it is not necessary to form the window portion, the window portion can be formed very easily by photolithography technique or punching with a punch. Therefore, it is possible to inexpensively provide a resonance label which has a simple structure, is easy to manufacture, and can be inactivated and can be subjected to an inactivation test.

[Brief description of drawings]

FIG. 1 is a top view of an example of a deactivatable resonance label according to the present invention.

FIG. 2 is a bottom view of an example of an inactivatable resonance label according to the present invention.

FIG. 3 is a vertical sectional view taken along the line III-III in FIGS. 1 and 2.

FIG. 4 is a vertical cross-sectional view taken along the line IV-IV of FIGS. 1 and 2.

FIG. 5 is an electrical schematic diagram of an example of an inactivatable resonance label according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Resonance label 10 Carrier layer 10a Upper surface (other surface of carrier layer) 10b Lower surface (one surface of carrier layer) 11 Window 21 First capacitor plate 22 Second capacitor plate 23 Third capacitor plate 24 Fourth Capacitor plate 30 Induction coil 60, 61 Adhesive layer

 ─────────────────────────────────────────────────── ─── Continued front page (72) Inventor Shoichi Makimoto 3-6-8, Kutaro-cho, Chuo-ku, Osaka City, Osaka Prefecture Toyo Aluminum Co., Ltd. (72) Nobuyuki Nakato Hisataro-ku, Chuo-ku, Osaka City, Osaka No. 6-8 Toyo Aluminum Co., Ltd.

Claims (1)

[Claims] 1. A first capacitor plate having at least one induction coil provided on one surface of an insulating carrier layer and electrically connected to one end of the induction coil, and the other end of the induction coil. A second capacitor plate electrically connected to the first capacitor layer, and a third capacitor plate formed on the other surface of the one carrier layer facing the first capacitor plate and the second capacitor plate via the carrier layer. A resonance label formed by providing a capacitor plate and a fourth capacitor plate and electrically connecting the third and fourth capacitor plates to each other, which is formed by at least the first and third capacitor plates. At least one window portion penetrating the carrier layer is provided in the carrier layer in the capacitor portion formed by An inactivatable resonance label comprising a third capacitor plate and a third capacitor plate adhered by an insulating adhesive.