JPH07141578A - Resonance label - Google Patents

Abstract

PURPOSE:To provide a resonance label which eliminates the need for a short- circuit processing between a conductor on the top surface and a conductor on the reverse surface and can be increased in signal intensity without increasing the size or causing an increase in the cost. CONSTITUTION:The driving circuit of the resonance label 1 consists of a 1st capacitor part C1, a 2nd capacitor part C2, and an induction coil 30. The 2nd capacitor part C2 is arranged in the center of a coil window part 31 and at a distance from the induction coil 30, and the 1st capacitor part C1 is arranged outside the induction coil 30. Consequently, the need for the short-circuit processing is eliminated, the manufacturing process is simplified, and the manufacture cost is reduced. Resonance characteristics are obtained as designed and the mechanical strength is sufficiently guaranteed. Further, the signal intensity of the resonance label is increased.

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 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.

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 above, an induction coil formed by sandwiching an insulating carrier layer 110 with capacitor plates 121 and 123 made of a pair of conductors to form a capacitor portion C101, and forming the capacitor portion C101 on the lower surface 110b of the carrier layer 110. A vibration circuit is configured by electrically connecting 130.

The electric conduction between the capacitor plate 123 on the upper surface 110a side of the carrier layer 110 and the induction coil 130 is such that the capacitor plate 1 is formed in the short-circuit portion 150 formed of a through hole provided at the corner of the carrier layer 110.
This is ensured by the direct contact between the aluminum foil forming 23 and the aluminum foil forming the induction coil 130. On the other hand, the lower surface 110b of the carrier layer 110
Electrical conduction between the side condenser plate 121 and the induction coil 130 is ensured by the fact that the aluminum foil forming the condenser plate 121 and the aluminum foil forming the induction coil 130 are continuous.

[0005]

However, in the above-described conventional resonance label 100, a through hole is formed in the carrier layer 110, and upper and lower aluminum foils sandwiching the carrier layer 110 are brought into contact with each other in the through hole to cause a short circuit portion. 150 must be formed. Since the short-circuiting process is performed, the manufacturing process of the resonance label 100 is complicated and the manufacturing cost is increased, and the resistance (contact resistance) due to the contact between the upper and lower aluminum foils is generated, resulting in the resonance characteristics as designed. There was a problem that I could not get it. In addition, the short circuit part 150
However, there is also a problem that the mechanical strength is not sufficient because the carrier layer 110 is not provided.

Further, the capacitor portion C101 is arranged close to a part of the induction coil 130 in the coil window portion 131 inside the induction coil 130, which is formed, for example, in three layers along the periphery of the carrier layer 110. Has been done. for that reason,
When the vibrating circuit resonates with an electromagnetic wave having a frequency matching the resonance frequency, in the vicinity where the capacitor unit C101 and the induction coil 130 are close to each other, the direction intersects the direction perpendicular to the direction of the current flowing in the induction coil 130. There is also a problem that the magnetic flux is blocked by the condenser plates 121 and 123, the effective area of the resonance label 100 is reduced, and the signal strength of the resonance label 100 is weakened.

Then, in order to compensate for the weakening of the signal strength of the resonance label 100 or to further strengthen it, the induction coil 13
In some cases, it is necessary to take measures such as thickening the line width of 0, increasing the size of the resonance label 100, and forming the induction coil 130 with a copper wire, resulting in a significant cost increase. .

The present invention has been made in view of the above-mentioned points, and an object of the present invention is to eliminate the need for a short-circuiting treatment between the conductor on the upper surface and the conductor on the lower surface, and to increase the size and increase the cost. An object of the present invention is to provide a resonance label capable of increasing the signal intensity without moving.

[0009]

In order to achieve the above object, in a resonance label according to the present invention, at least one induction coil is provided on one surface of an insulating carrier layer, and the induction coil A first capacitor plate electrically connected to one end and a second capacitor plate electrically connected to the other end of the induction coil are provided, and one carrier layer is provided on the other surface of the carrier layer. A third capacitor plate and a fourth capacitor plate, which are opposed to the first capacitor plate and the second capacitor plate, respectively, and electrically connect the third capacitor plate and the fourth capacitor plate to each other. A first capacitor portion including the first capacitor plate and the third capacitor plate, and the second capacitor plate. A resonance label in which a vibrating circuit is formed by a second capacitor section including the fourth capacitor plate and the induction coil, the center of a coil window section surrounding the second capacitor section with the induction coil. In addition, the first capacitor portion is arranged apart from the induction coil, and the first capacitor portion is arranged outside the induction coil.

[0010]

According to the above means, on the lower surface of the carrier layer,
The first capacitor plate forming the first capacitor portion, the induction coil, and the second capacitor plate forming the second capacitor portion are electrically connected to each other, while on the upper surface of the carrier layer, , The third capacitor plate forming the first capacitor section and the fourth capacitor plate forming the second capacitor section are electrically connected to each other, and thus the carrier for the resonance label as in the conventional case Even if the upper and lower conductors sandwiching the layer are not in direct contact with each other to ensure electrical continuity, the vibrating circuit effectively works for an electromagnetic wave having the same frequency as the resonance frequency.

Therefore, it is not necessary to perform a short-circuit process for bringing the upper and lower conductors into contact with each other, the manufacturing process of the resonance label can be simplified, and the manufacturing cost can be remarkably reduced. In addition, contact resistance that may occur due to contact between the upper and lower conductors can be eliminated, and not only the resonance characteristics as designed can be obtained, but also mechanical strength is sufficiently ensured.

Further, since the second condenser portion is arranged at the center of the coil window portion and apart from the induction coil, and the first condenser portion is arranged outside the induction coil, the inside of the induction coil is resonated at the time of resonance. The magnetic flux generated by the current flowing through the capacitor becomes less susceptible to the influence of the capacitor plate of the second capacitor section, increasing the effective area of the resonance label and increasing the Q value indicating the sharpness of the resonance frequency characteristic of the circuit. Become.

Therefore, the signal intensity of the resonance label becomes stronger due to the synergistic effect of the increase of the effective area and the increase of the Q value.

[0014]

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, this resonance label 1 has a third label on the upper surface 10a of the insulating carrier layer 10, for example.
Capacitor plate 23 and fourth capacitor plate 24 are formed, while as shown in FIGS. 2 and 3,
The first capacitor plate 21, the second capacitor plate 22, and the induction coil 3 are formed on the lower surface 10b of the carrier layer 10.
It is made up of zeros.

The oscillating circuit of the resonance label 1 includes a first condenser portion C1 made up of a first condenser plate 21 and a third condenser plate 23, a second condenser plate 22 and a fourth condenser plate 2.
It is composed of a second capacitor section C2 made of No. 4 and the induction coil 30. The combined capacitance of the first capacitor section C1 and the second capacitor section C2 is determined by the resonance frequency of the vibration circuit and the inductance of the induction coil 30.

The second capacitor portion C2 is arranged, for example, at the center of the coil window portion 31 inside the induction coil 30 that is wound in three layers and at a distance from the induction coil 30. In addition, although not particularly limited, in FIG.
0 is formed in a substantially rectangular spiral pattern, and the center point (not shown) of the substantially rectangular second capacitor plate 22 intersects with the diagonal line of the substantially rectangular coil window 31 (not shown). No)).

On the other hand, the first capacitor portion C1 is located outside the induction coil 30 disposed near one side of the carrier layer 10,
That is, it is arranged between the induction coil 30 and the other side edge of the carrier layer 10.

Each of the condenser plates 21, 22,
Each of 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 face each other with the carrier layer 10 sandwiched therebetween, while the second capacitor plate 22 and the fourth capacitor plate 24 sandwich the carrier layer 10 sandwiched therewith. It is relative to.

The induction coil 30 is formed in a series with the first capacitor plate 21 and the second capacitor plate 22, one end of which is the first capacitor plate 21 and the other end is the second capacitor plate 21. Are electrically connected to the condenser plates 22 of FIG. Third
The capacitor plate 23 and the fourth capacitor plate 24 are electrically connected to each other via a bridge conductor 40.

In the resonance label 1 having the above-described structure, the resonance circuit of the resonance label 1 attached to a product or the like resonates with an electromagnetic wave having a frequency matching the resonance frequency, so that the existence of the resonance label 1 is a security. The first condenser part C1, which is detected by the system
Alternatively, a dielectric breakdown portion (not shown) that easily causes dielectric breakdown may be formed in the second capacitor portion C2. With this configuration, when passing through the cashier, dielectric breakdown occurs due to high-energy electromagnetic waves generated by the cashier, and the vibrating 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 vibration circuit of the resonance label 1 resonates with the electromagnetic waves generated at the outlet of the store 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, an aluminum foil having no pattern is adhered to the lower surface 10b and the upper surface 10a of the carrier layer 10 via an adhesive agent. Then, a photoresist (photosensitive resin) is further applied to the attached lower layer aluminum foil, and the patterns of the first capacitor plate 21, the second capacitor plate 22 and the induction coil 30 are transferred by the photolithography technique and etched. Then, the pattern is formed on the aluminum foil. On the other hand, similarly, the third capacitor plate 23 and the fourth capacitor plate 2 are formed on the upper aluminum foil by photolithography and etching.
4 and the pattern of the bridge conductor 40 are formed. The resonance label 1 is completed by the above procedure.

When the above-mentioned dielectric breakdown portion is provided, for example, a small through hole is previously formed in the carrier layer 10, and the aluminum foils above and below the carrier layer 10 in the through hole are insulated with an insulating adhesive. You can stick them together with.

According to the above embodiment, the lower surface 1 of the carrier layer 10
At 0b, the first capacitor plate 21, the induction coil 30, and the second capacitor plate 22 are
On the upper surface 10a of the carrier layer 10, the third capacitor plate 23 and the fourth capacitor plate 24 are electrically connected to each other, so that the carrier layer 10 is electrically connected to each other. It is not necessary to perform a short-circuiting process of directly contacting the upper and lower conductors sandwiching each other to secure electrical continuity, and the manufacturing process of the resonance label 1 can be simplified and the manufacturing cost can be significantly reduced. . In addition, the contact resistance that may occur due to the contact between the upper and lower conductors is eliminated, not only the resonance characteristics as designed can be obtained, but also the mechanical strength is sufficiently secured.

Further, since the second capacitor portion C2 is arranged at the center of the coil window portion 31 and apart from the induction coil 30, and the first capacitor portion C1 is arranged outside the induction coil 30, induction at resonance occurs. The magnetic flux generated by the current flowing through the coil 30 is less affected by the inhibition of the capacitor plates 22 and 24 of the second capacitor section C2, and the effective area of the resonance label 1 increases and the Q value of the circuit also increases. Become, resonance label 1
The signal strength of becomes stronger.

The fact that the signal strength has increased has been confirmed by the results of the verification conducted by the present inventors. In Figure 4,
As the verification result, the resonance label 1 of the present embodiment and the conventional resonance label 100 shown in FIG. 5 to FIG. 7 show the results of examining the frequency characteristic of the signal intensity at resonance. It can be seen that the resonance label 1 has a higher signal intensity. The resonance frequency (frequency at each peak in FIG. 4) is deviated between the present embodiment and the conventional example. The cause of the deviation is that the induction coil (30, 130) and the capacitor section (C1, C2). , C101) and is considered to be a deviation amount that does not cause any particular problem. In addition, although the Q value generally decreases when the resonance frequency shifts to the low frequency side, the Q value is considered to be larger than that in the conventional example because the signal strength of the present embodiment is stronger in FIG.

In the above embodiment, the vibration circuit of the resonance label 1 is composed of the two condenser parts C1 and C2 and the one induction coil 30, but it is arranged at least in the coil window part 31. If the condenser portion is arranged at the center of the coil window portion 31 and apart from the induction coil 30, three or more condenser portions may be provided, or two or more induction coils may be provided. Good.

The first capacitor plate 21, the second capacitor plate 22 and the induction coil 30 may be integrally formed, or may be separately formed and integrated. Similarly, the third capacitor plate 23, the fourth capacitor plate 24, and the bridge conductor 40 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.

[0029]

According to the resonance label of the present invention, on the lower surface of the carrier layer, the first capacitor plate forming the first capacitor section, the induction coil, and the second capacitor section forming the second capacitor section are formed. And a capacitor plate electrically connected to each other, and on the upper surface of the carrier layer, a third capacitor plate forming the first capacitor part and a fourth capacitor plate forming the second capacitor part. Are electrically connected to each other, the first capacitor part is not required to be electrically connected to each other by directly contacting the upper and lower conductors sandwiching the carrier layer of the resonance label as in the conventional case. The oscillating circuit composed of the second capacitor section and the induction coil works effectively.

Therefore, it is not necessary to perform a short-circuiting process for bringing the upper and lower conductors into contact with each other, the manufacturing process of the resonance label can be simplified, and the manufacturing cost can be remarkably reduced. In addition, contact resistance that may occur due to contact between the upper and lower conductors can be eliminated, and not only the resonance characteristics as designed can be obtained, but also mechanical strength is sufficiently ensured.

Further, since the second condenser portion is arranged at the center of the coil window portion and apart from the induction coil, and the first condenser portion is arranged outside the induction coil, the inside of the induction coil at the time of resonance occurs. The magnetic flux generated by the current flowing through is less affected by the influence of the capacitor plate of the second capacitor section, the effective area of the resonance label is increased, and the Q value of the circuit is also increased.

Therefore, the signal intensity of the resonance label becomes strong due to the synergistic effect of the increase of the effective area and the increase of the Q value.

[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 vertical sectional view taken along the line III-III in FIGS. 1 and 2.

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 cross-sectional view taken along line VII-VII of FIGS. 5 and 6.

[Explanation of symbols]

 C1 1st capacitor part C2 2nd capacitor part 1 Resonance label 10 Carrier layer 10a Upper surface (the other surface of the carrier layer) 10b Lower surface (one surface of the carrier layer) 21 First capacitor plate 22 Second capacitor plate 23 Third Condenser Plate 24 Fourth Condenser Plate 30 Induction Coil 31 Coil Window

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Shoichi Makimoto 3-6-8, Kutaro-cho, Chuo-ku, Osaka-shi, Toyo Aluminum Co., Ltd. (72) Inventor Hiroshi Tada 3-chome, Kutaro-cho, Chuo-ku, Osaka 6-8 Toyo Aluminum Co., Ltd. (72) Inventor Nobuyuki Nakato 3-6-8, Kutaro-cho, Chuo-ku, Osaka-shi, Osaka Prefecture Toyo Aluminum Co., Ltd. (72) Masanobu Konan Kiyomidai, Kawachinagano-shi, Osaka Prefecture 3-5-13

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 first capacitor section comprising a first capacitor plate and a fourth capacitor plate, electrically connecting the third and fourth capacitor plates to each other, and comprising the first capacitor plate and the third capacitor plate A second condenser portion including the second condenser plate and the fourth condenser plate, and the induction coil. A resonance label in which a vibration circuit is formed with a coil, the second capacitor section being arranged at the center of a coil window section surrounded by the induction coil and away from the induction coil, and the first capacitor. A resonance label, wherein a portion is arranged outside the induction coil.