JPH07272135A - Resonance label - Google Patents

Abstract

PURPOSE:To provide a resonance label which can improve the signal strength with a simple structure without enlarging its size and which can reduce the size without deteriorating the performance of signal strength. CONSTITUTION:A resonance circuit consisting of a guide coil 30 and a capacitor C1, is provided, and the capacitor C1 is arranged in an area except for a coil window part 31 surrounded by the guide coil 30. The capacitor C1 consists of a first capacitor plate 21 and a second capacitor plate 22, which are respectively formed on the upper surface 10a and the lower surface 10b of an insulating carrier layer 10. The first capacitor plate 21 is electrically connected to the outer end part of the guide coil 30. The second capacitor plate 22 is electrically connected to the inner end part of the guide coil 30 in a shorting part 50 provided in the coil window part 31.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a resonance label provided with a resonance circuit for electromagnetic waves and, for example, to 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 known which 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. Such a resonance label has a specific frequency (resonance frequency)
A resonance circuit that resonates with the electromagnetic wave is formed. If you attempt to illegally take a product with this resonance label out of the store, the resonance circuit of the resonance label will resonate with the electromagnetic waves of the frequency that matches the resonance frequency emitted at the outlet of the store, causing resonance. The presence of the label is detected by a detection device such as a security system.

FIG. 5 to FIG. 7 show a top view, a bottom view and a vertical sectional view of a conventional general resonance label, respectively. As shown in those figures, the conventional resonance label 100
In the coil window portion 1 surrounded by the induction coil 130
Inside 31, the insulating carrier layer 110 is sandwiched between capacitor plates 121 and 123 made of a pair of conductors to form a capacitor portion C101. A resonance circuit is configured by electrically connecting the induction coil 130 formed on the lower surface 110b of the carrier layer 110 to the capacitor portion C101.

The electric conduction between the capacitor plate 123 on the upper surface 110a side of the carrier layer 110 and the induction coil 130 forms the capacitor plate 123 at the short-circuit portion 150 formed by the through hole provided at the corner of the carrier layer 110. This is ensured by directly contacting the aluminum foil forming the induction coil 130 and the aluminum foil forming the induction coil 130. On the other hand, the electrical conduction between the capacitor plate 121 on the lower surface 110b side of the carrier layer 110 and the induction coil 130 is a series of the aluminum foil forming the capacitor plate 121 and the aluminum foil forming the induction coil 130. It is secured by

[0005]

The above-mentioned resonance label 1
00 is used by being attached to an object to be detected such as a product. Therefore, depending on the product etc., there may be inconveniences such as its aesthetic appearance being impaired and the cautions etc. written on the package of the product etc. being covered up. 100 is preferably as small as possible. Further, in view of application to a wide variety of products and the like, and the usage form of disposable, it is desired to downsize the resonance label and reduce the price of the resonance label.

However, if the resonance label 100 is simply made smaller, the effective area of the resonance label 100 (from the average area of the induction coil 130, the area of the capacitor portion C101 formed in the coil window 131 surrounded by the induction coil 130). (The area obtained by subtracting) is reduced and the Q value representing the sharpness of the resonance frequency characteristic of the circuit is also reduced, resulting in extremely weak signal strength.

Therefore, in order to reduce the size, it is necessary to take measures to further increase the signal strength of the resonance label. As a means for that, the line width of the induction coil 130 is thickened or the area of the coil window 131 is increased. Can be increased, or the size of the resonance label 100 can be increased. However, any of the methods not only causes a significant increase in manufacturing cost, but also has a drawback that it is against the reduction in size.

The present invention has been made in view of the above points, and an object of the present invention is to provide a resonance label capable of increasing the signal intensity with a simple structure without increasing the size of the label.

Another object of the present invention is to provide a resonance label whose size can be reduced without degrading performance such as signal strength.

[0010]

In order to achieve the above object, a resonance label according to the present invention is provided with a resonance circuit including at least one spiral induction coil and at least one capacitor. In, the induction coil is formed on one surface of the insulating carrier layer,
Also, the capacitor is formed on one surface of the carrier layer and is electrically connected to an outer end of the induction coil, and the first capacitor plate is formed on the other surface of the carrier layer. And a second capacitor plate formed opposite to the capacitor plate, the capacitor is disposed in a region other than the coil window portion surrounded by the induction coil, and the inner end of the induction coil and the first capacitor plate are disposed. The second condenser plate and the second condenser plate are electrically connected in the coil window portion.

[0011]

According to the resonance label of the present invention, since the capacitor is arranged in the region excluding the coil window surrounded by the induction coil, the capacitor disappears in the coil window and the area of the coil window increases. Therefore, the Q value of the circuit is greatly increased, and the signal strength of the resonance label is increased.

Therefore, it is possible to obtain a resonance label having a signal intensity higher than that of the conventional one with the same size as the conventional one,
Further, it is possible to obtain a resonance label having a signal strength equal to or stronger than the conventional one and smaller than the conventional one.

[0013]

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. FIG. 4 shows the frequency characteristic of the signal intensity at the resonance of the resonance label.

As shown in FIGS. 1 to 3, the resonance label 1 includes at least one (in this example, one) induction coil 30 and at least one (in this example, one) capacitor C1. It has a configured resonance circuit, and its capacitor C1 is arranged in a region other than the coil window portion 31 surrounded by the induction coil 30, specifically, outside the induction coil 30 and laterally.

The induction coil 30 is formed in a spiral shape on the upper surface 10a of the insulating carrier layer 10. The inner end portion of the induction coil 30 has a coil window portion 31 due to a short circuit with a second capacitor plate 22 described later.
It is electrically connected to a pad 40 provided inside.

The capacitor C1 is the upper surface 1 of the carrier layer 10.
A first condenser plate 21 formed in 0a,
It is configured by sandwiching the carrier layer 10 with the second capacitor plate 22 formed on the lower surface 10b of the carrier layer 10.

The first capacitor plate 21 is electrically connected to the outer end of the induction coil 30.

The second capacitor plate 22 is arranged opposite to the first capacitor plate 21 with the carrier layer 10 in between. Then, the second capacitor plate 22 includes the pad 4 at the inner end of the induction coil 30.
It is electrically connected to the pad 41 formed on the lower surface 10b of the carrier layer 10 opposite to 0 through the conductor portion 42.

The inner end portion of the induction coil 30 and the second capacitor plate 22 are electrically connected to each other via the short-circuit portion 50 provided on the pads 40 and 41. The short-circuit portion 50 is, for example, in a through hole provided in the carrier layer 10 in a region sandwiched by the pads 40 and 41, where the pads 40 and 41 are in direct contact with each other or have conductivity. It is formed by being electrically connected to each other via an adhesive (conductive paste or the like).

These pads 40 and 41 are used for the coil window 3
It is needless to say that the size is sufficiently smaller than the size of 1 and does not adversely affect the Q value of the circuit.

The condenser plates 21,
22, the induction coil 30, the pads 40, 41, and the conductor portion 42 are all conductive, and are not particularly limited, but are formed of, for example, aluminum foil.

By the way, the resonance label 1 having the above-mentioned structure
The presence of the resonance label 1 is detected by the security system by the resonance circuit of the resonance label 1 attached to a product or the like resonating with an electromagnetic wave having a frequency matching the resonance frequency. To
A dielectric breakdown portion (not shown) that easily causes dielectric breakdown may be formed. With this configuration, when passing through the cashier, high-energy electromagnetic waves generated by the cashier cause dielectric breakdown at the dielectric breakdown portion, and the resonance circuit of the resonance label 1 can be invalidated. Therefore, only for products that are illegally taken out of the store without passing through the cashier, the resonance label 1
The resonance circuit of can resonate and the alarm of the security system can be activated.

The resonance label 1 constructed as described above is manufactured, for example, as follows. First, a through hole is opened by punching or the like in a portion of the carrier layer 10 where the short circuit portion 50 is formed. Then, an aluminum foil on which no pattern is formed is attached to each of the upper surface 10a and the lower surface 10b of the carrier layer 10 via an adhesive. At that time, in the opened through holes, the upper and lower adhered aluminum foils are brought into direct contact with each other to be electrically connected to each other. Alternatively, the through holes are filled with a conductive paste or the like, and the upper and lower aluminum foils are electrically connected to each other. When the adhesive used for attaching the aluminum foil has an insulating property, care should be taken not to fill the adhesive in the through hole of the short circuit portion 50.

Next, a photoresist (photosensitive resin) is further applied to the upper aluminum foil that has been stuck, and the first capacitor plate 2 is formed by photolithography.
Transfer the pattern of 1, the induction coil 30 and the pad 40,
Etch to form the pattern in the aluminum foil. On the other hand, similarly, the pattern of the second capacitor plate 22, the conductor portion 42, and the pad 41 is formed on the lower aluminum foil by the photolithography technique and the etching. The resonance label 1 is completed by the above procedure.

In the case of providing the above-mentioned dielectric breakdown portion, for example, a small through hole is made in advance in a portion of the carrier layer 10 corresponding to the capacitor C1, and the aluminum foils above and below the carrier layer 10 are formed in the through hole. It suffices to bond them with an insulating adhesive.

In the above description of the embodiment, for the sake of convenience, the surface of the carrier layer 10 on which the induction coil 30 is provided is the upper surface 10a, and the back surface is the lower surface 10b.
It is not necessary to strictly distinguish the top and bottom.

According to the above embodiment, the condenser C1
Is arranged in a region excluding the coil window portion 31, the capacitor is eliminated in the coil window portion 31 and the area of the coil window portion 31 is increased, so that the Q value of the circuit is significantly increased and the resonance label 1 The signal strength of becomes stronger.

Therefore, it is possible to obtain the resonance label 1 having a signal strength stronger than the conventional one with the same size as the conventional one, and also having the signal strength equal to or stronger than the conventional one, and more than the conventional one. It is also possible to obtain a small resonance label 1.

The fact that the signal strength has increased has been confirmed from the results of the verification conducted by the present inventors. In FIG. 4, as a result of the verification, the resonance label 1 (size: 4
cm × 4 cm) and the conventional resonance label 1 shown in FIGS. 5 to 7.
00 (size: 4 cm × 4 cm) shows the result of examining the frequency characteristic of the signal intensity at resonance, but assuming that the signal intensity at the resonance frequency of the conventional example is 100, the resonance label 1 of this example is shown. Then, the signal strength at the resonance frequency increased by 33% to 133. Further, the Q value is 50.8 in the conventional example, but is 70.8 in the present embodiment.
It was confirmed that the increase was 38%. That is, according to this example, it was found that the Q value was increased by 38% and the signal intensity was correspondingly increased by 33%.

Here, as shown in FIG. 4, the resonance frequency is deviated between the present embodiment and the conventional example. The cause of the deviation is the induction coil (30, 130) and the capacitor (C1, C101) is a variation due to the design, and is considered to be a deviation amount that does not cause any particular problem.

Although the resonance circuit of the resonance label 1 is composed of the induction coil 30 and the capacitor C1 in the above embodiment, at least one induction coil and at least one capacitor are provided.
If the condenser is not placed in the coil window,
Two or more induction coils may be provided, or two or more capacitors may be provided.

The first capacitor plate 21, the induction coil 30 and the pad 40 may be integrally formed, or may be separately formed and integrated. Similarly, the second capacitor plate 22, the conductor 42, and the pad 41 may be integrated in advance or may be integrated later. Further, it goes without saying that the resonance label 1 may be manufactured by a method other than the above manufacturing procedure.

[0033]

According to the resonance label of the present invention, since the capacitor is arranged in the area excluding the coil window portion surrounded by the induction coil, the capacitor disappears in the coil window portion and the area of the coil window portion is reduced. Because it will grow
The Q value of the circuit is greatly increased, and the signal strength of the resonance label is increased.

Therefore, it is possible to obtain a resonance label having a signal intensity higher than that of the conventional one with the same size as the conventional one,
Further, it is possible to obtain a resonance label having a signal strength equal to or stronger than the conventional one and smaller than the conventional one.

[Brief description of drawings]

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

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

FIG. 3 is a resonance label according to the present invention III in FIGS. 1 and 2;
It is a longitudinal cross-sectional view in -III.

FIG. 4 is a characteristic diagram showing frequency characteristics of signal intensity at resonance for a resonance label according to the present invention and a conventional resonance label.

FIG. 5 is a top view of a conventional resonance label.

FIG. 6 is a bottom view of a conventional resonance label.

FIG. 7 is a vertical sectional view taken along line VII-VII in FIGS. 5 and 6 of a conventional resonance label.

[Explanation of symbols]

 C1 capacitor 1 resonance label 10 carrier layer 10a upper surface (one surface) 10b lower surface (other surface) 21 first capacitor plate 22 second capacitor plate 30 induction coil 31 coil window portion

Front Page Continuation (72) Inventor Shoichi Makimoto 3-6-8 Kutaro-cho, Chuo-ku, Osaka City, Osaka Prefecture Toyo Aluminum Co., Ltd. (72) Innovator Masanobu Konan 3-5-13 Kiyomidai, Kawachinagano City, Osaka Prefecture

Claims (1)

[Claims] 1. A resonance label comprising a resonance circuit comprising at least one spiral-shaped induction coil and at least one capacitor, the induction coil comprising:
A first capacitor plate formed on one surface of an insulating carrier layer, the capacitor being formed on one surface of the carrier layer and electrically connected to an outer end of the induction coil. And the first surface on the other surface of the carrier layer.
And a second capacitor plate formed opposite to the capacitor plate, the capacitor is disposed in a region other than the coil window portion surrounded by the induction coil, and the inner end of the induction coil and the first capacitor plate are disposed. A resonance label, characterized in that the condenser plate of 2 is electrically connected in the coil window portion.