JPH0793671A - Resonance tag - Google Patents

Abstract

PURPOSE:To attain miniaturization as improving the performance of a resonance tag by forming the resonance tag with the one of two-plane coil system as against a conventional one of single-plane system. CONSTITUTION:Capacitor electrode plate parts that is circuits of spiral pattern and which form a coil with the spiral pattern and are constituted of almost the whole spiral pattern are constituted on the two planes of resin film 6 as a dielectric, and also, metallic foil 7, 8 used as circuits provided with circuit terminal parts 7A, 8A whose one terminals are energized electrically form a substrate material by adhering with each other, and a (resonance circuit) is printed by using ink provided with etching resistant property on both planes of the substrate material i.e., the metallic foil 7A, 8A by every kind of printing method, and after that, chemical etching treatment is applied to it by using chemical solution such as acid or alkali, etc., then, the resonance circuit can be formed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a resonance tag which constitutes a resonance circuit which resonates with a radio wave of a specific frequency transmitted from a detection device, and more particularly to a technique for improving the performance of the resonance tag while reducing its size. .

[0002]

2. Description of the Related Art Department stores, discount stores, video rental stores, CD shops and the like use a system in which a presence-sensitive non-contact ID tag (resonance tag) is attached to a product to prevent shoplifting. This resonant tag is
It will be removed when paying at the cash register, but if the customer does not pay the price and passes through the gate equipped with a specific detection device with this resonant tag attached to the product, a warning will be issued by a buzzer, lamp, etc. Has become.

By the way, a conventionally well-known resonance tag is constructed as shown in FIG. 7 and FIG. 8 (JP-A-1-129396 and JP-A-1-27).
7991 publication). That is, the resonance tag 1 uses a polyolefin resin film such as polyethylene or another synthetic resin film 2 as a dielectric, and metal foils 3 and 4 such as aluminum foil are extruded on both surfaces of this resin film (dielectric) 2. Alternatively, the laminated material is manufactured as a substrate material by a method such as thermocompression bonding.

Of the metal foils 3 and 4 attached to both sides 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 chemical etching to form a resonance circuit.

In order to form a resonance circuit, the circuit terminal portion 3B in the spiral-shaped 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. As a connection method, a so-called pressure welding method or the like in which both metal foils 3 and 4 are crushed up and down by a hard substance whose surface is uneven is used. By this pressure contact, the resin film 2 between the metal foils 3 and 4 is broken, and the metal foils 3 and 4 on both sides are electrically connected and short-circuited. Due to this short circuit, a resonance circuit including three elements of a resistance R, an inductance L, and an electrostatic capacity (capacitor capacity) C is formed, and the resonance tag 1 has a resonance frequency.

The equivalent circuit of this resonance circuit is as shown in FIG. 9, in which the metal foils 3 and 4 and the dielectric 2 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√ (L
C)}, a signal of this frequency is applied from the detection device of the gate to resonate and its existence is detected.

[0008]

However, in the conventional resonance tag 1 as described above, a circuit having a spiral pattern is formed only on one surface of the resin film 2, and the coil is formed by the spiral pattern. At the same time, since it is a so-called single-sided coil type in which a circuit having a capacitor electrode plate portion and a circuit terminal portion at both ends is formed, there is the following inconvenience.

That is, since it is a single-sided coil type, when the size of the resonance tag 1 is limited to a small size, the size of the coil and the capacitor is limited, and it is impossible to form a low frequency type, and the frequency It is disadvantageous in terms of performance, such as restrictions on expanding the variable range. Therefore, performance has to be sacrificed in trying to keep the size as small as possible. On the contrary, if the performance is favored, the size cannot be reduced.

In view of the above-mentioned conventional problems, the present invention aims to improve the performance of the resonance tag and downsize it by using a double-sided coil type resonance tag as compared with the conventional single-sided coil type. To aim.

[0011]

Therefore, according to the present invention, a spiral pattern circuit is formed on each of both surfaces of a resin film as a dielectric, and a coil is formed by the spiral pattern, and the spiral pattern is formed. A circuit having a capacitor electrode plate portion and having a circuit terminal portion at one end was provided almost entirely to form a resonance circuit that resonates with a radio wave of a specific frequency transmitted from the detection device.

In particular, it is preferable that the circuit having the spiral pattern provided on one surface of the resin film is formed smaller than the circuit having the spiral pattern provided on the other surface.

[0013]

In this structure, the resonance frequency of the equivalent circuit of the resonance circuit of the resonance tag is f = √2 / {2π√ (LC)}.
Alternatively, f = 1 / {2π√ (2LC)} or the like, and when a signal of this frequency is given from the detection device, it resonates and its existence is detected.

According to this resonance tag, since it is a double-sided coil type, even if the size of the resonance tag is limited to a small size, the size of the coil and the capacitor is not limited as compared with the single-sided coil type resonance tag. In addition, 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.

When manufacturing the resonance tag, it is necessary to provide a spiral pattern of circuits on both sides of the resin film without shifting. When the circuits of the spiral pattern having the same size are provided on both sides of the resin film, the allowable range of this deviation becomes narrow, and it is difficult to align the circuits of the spiral pattern on both sides of the resin film.

However, by forming the circuit having the spiral pattern provided on one surface of the resin film smaller than the circuit having the spiral pattern provided on the other surface, the allowable range of misalignment is widened and the resin film is made wider. It becomes easy to align the circuits in the spiral patterns on both sides of the.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the accompanying drawings. 1 and 2, the resonance tag 5 is a circuit having a spiral pattern on both surfaces of a resin film 6 serving as a dielectric, and a coil is formed by the spiral pattern, and substantially the entire spiral pattern is formed. This is a configuration in which a circuit having a capacitor electrode plate portion and a circuit terminal portion at one end portion is provided to form a resonance frequency circuit.

That is, the resonance tag 5 uses a polyolefin resin film such as polyethylene having a small dielectric loss and a thickness of 0.03 mm or less or another synthetic resin film 6 as a dielectric material. ) 6, both sides of which metal foils 7 and 8 such as aluminum foil are extruded or bonded by thermocompression bonding are manufactured as a substrate material.

Among the metal foils used, particularly in the case of aluminum foil, the purity of aluminum is 99.0% or more 99 because of its electrical properties, processing suitability such as laminating or etching work, and physical properties of products. 0.7% or less is desirable.

The metal foils 7 and 8 bonded to both sides of the resin film 6 as the dielectric are circuits of spiral pattern, respectively, and form a coil by the spiral pattern, and substantially the entire spiral pattern. Is used as a circuit having a capacitor electrode plate portion and circuit terminal portions 7A and 8A at one end, and when the metal foils 7 and 8 are aluminum foils, the thickness of 0.040 mm or more and 0.060 mm or less is used. Foil is preferred.

Then, in order to obtain a specific resonance frequency, various printing methods such as gravure printing, silk screen printing, flexographic printing, letterpress printing etc. on both sides of the above-mentioned substrate material, that is, on the metal foils 7 and 8. The "resonance frequency circuit" is printed using ink having etching resistance, and then chemically etched using a chemical solution such as acid or alkali to form a resonance circuit.

The resonance circuit may be used as it is, but at appropriate positions in the spiral pattern circuit of the metal foil 7 on one side, for example, the circuit terminal portion 7A and the spiral pattern circuit of the metal foil 8 on the opposite side. May be connected to an appropriate position in, for example, the circuit terminal portion 8A. In this case, as described in the description of the conventional example, the resin film 6 between the metal foils 7 and 8 is destroyed by the pressure welding method or the like, and the metal foils 7 and 8 on both sides are
8 is conducted and short-circuited.

The equivalent circuit of the resonance circuit when the metal foils 7A and 8A are not conducted is as shown in FIG. 3. The metal foils 7 and 8 and the resin film 6 form a capacitor capacitance, and the resistance is the metal foil 7 and It is formed by the resistance of 8 itself. The resonance circuit of this equivalent circuit is f = √2 / {2π√ (LC)}, and when a signal of this frequency is given from the detection device of the gate, it resonates and its existence is detected.

An equivalent circuit of the resonance circuit of the resonance tag 5 having the metal foils 7 and 8 conducted is as shown in FIG. 4, and the resonance frequency of the equivalent circuit is f = 1 / {2π√ (2L
C)} is obtained, and a resonance frequency about half that in the case where no conduction is made is obtained.

Here, in FIG. 2, unexplained reference numerals 9 and 10 are adhesive layers 1 on both surfaces of the substrate material, respectively.
It is a high-quality paper and a release paper which are adhered via 1, 12.

According to the resonance tag 5 having the above structure, since it is a double-sided coil type, even when the size of the resonance tag 5 is limited to a small size, the size of the coil and the capacitor is smaller than that of the single-sided coil type resonance tag. There is no limitation and it is possible to form a low frequency type, and there are few limitations when expanding the variable range of the frequency, which is advantageous in terms of performance.

The effects are summarized as follows. (1) By narrowing the line width and the line width of the spiral pattern, a low frequency type can be manufactured. (2) By narrowing the line width and the line width of the spiral pattern, it is possible to reduce the size while maintaining the same performance. (4) The variable range of frequency can be expanded. (5) When the width of the spiral pattern on one side is narrowed, the resonance performance does not deteriorate.

The use of the resonance tag 5 is as follows.
In addition to the above-mentioned shoplifting prevention, there are the following effective applications. That is, by sewn the resonant tag 5 to the surgical gauze, it is possible to detect if the surgical gauze accidentally remains in the human body during surgery. In addition, by carrying the resonance tag 5 with an elderly person with senile dementia, it is possible to detect when the elderly person wanders unnecessarily.

Further, a system in which the resonance tag 5, the Carla code recently developed and a camera (reading mechanism) are combined is conceivable. First, the Carla code will be explained. The Carla code is 4 in the "Ta" character.
Information can be coded by a combination of filling one square, and the coding system can be freely coded except that there is a rule in the combination of filling.

The system in which the resonance tag 5, the Carla code and the camera are combined is effectively used, for example, for entry / exit checks of events, marathon competitions, ski lift ticket checks, and physical distribution transportation.

Among them, the system for the marathon event will be explained. The marathon runner finishes by sewing the resonance tag 5 and a paper on which a carla code for identifying the runner is sewn to the number part of the marathon runner. At the same time, the presence of the resonance tag 5 is detected, the camera is automatically turned on, the Karla code of the bib number is read, and the runner is identified.

In the resonance tag 5 described above,
Normally, a circuit having a spiral pattern of the same size is provided on each of both surfaces of the resin film 6 serving as a dielectric, but a circuit having a spiral pattern provided on one surface of the resin film 6 is provided on the other surface. Forming the circuit smaller than the pattern circuit has the following manufacturing advantages.

That is, when the resonance tag 5 is manufactured, it is necessary to provide the spiral pattern circuits on both surfaces of the resin film 6 without shifting. When the circuits of the spiral pattern of the same size are provided on both sides of the resin film 6, the allowable range of this deviation becomes narrow, and it is difficult to align the circuits of the spiral pattern on both sides of the resin film 6.
However, by forming the circuit having the spiral pattern provided on one surface of the resin film 6 smaller than the circuit having the spiral pattern provided on the other surface, the circuit having the spiral pattern is generated even if some deviation occurs. The positions of the resin film 6 match each other, that is, the allowable range of deviation is widened, and
It is easy to align the circuits in the spiral pattern on both sides of the.

Further, for example, when the resonance tag 5 is used in a shoplifting prevention system, if the resonance frequency is changed according to the type of the product to be attached, it is possible to immediately know what kind of the shoplifted product is from the frequency. You can For such demands and conveniences, the frequency of the resonance tag 5 may be variable.

As means for varying the frequency, a method of cutting out a part of the metal foils 7 and 8, that is, reducing the number of turns of the coil to reduce the capacitor capacity (cutting method), circuit terminal portions 7A and 8A, etc. Examples thereof include a method of increasing the conduction positions of the metal foils 7 and 8 and a method of changing the conduction positions of the metal foils 7 and 8. In addition to the above-mentioned pressure welding method, ultrasonic welding method, heat fusion method, and dimple welding method (dimple processing is performed at a planned conduction point, and the amplified resonance frequency is used as a means for making the conduction. The method of conducting the dimple portion) or the like can be used.

The cutting method or the above various conducting means may be applied before the resonance tag 5 is supplied to the user. In that case, an appropriate position is preliminarily set so as to obtain a frequency according to the user's request. Cut, conduct at multiple points, or conduct at appropriate positions. When the user wants to change the frequency, for example, refer to the relationship diagram between the frequency and the cut position in the metal foils 7 and 8 at which position should be cut. Just cut it. The same applies to the case where the number of conducting points is increased or changed. Also, by using a computer that stores the relationship between the cut position or conduction position and the frequency and a dot printer connected to the computer, the user can input an arbitrary frequency and set the resonance tag 5 at a predetermined position of the printer. For example, it is also possible to adopt a configuration in which an appropriate position is automatically cut or electrically connected.

Here, FIGS. 5 and 6 are views showing the above-mentioned frequency change state for reference, and of these, FIG. 5 is a plan view showing an example of the resonance tag 5. It can be seen that the frequency changes as shown in FIG. 6 when the conductive portions are changed from A to R shown in FIG. The frequency varying means described above can also be applied to a conventional single-sided coil type resonance tag.

Although the present invention has been described with reference to particular embodiments, it is not limited thereto, and it is understood by those skilled in the art that the scope of the claims attached to the present invention. It should be noted that various changes and modifications can be made without departing.

[0039]

As described above, according to the resonance tag of the present invention, a spiral pattern circuit is formed on each of both surfaces of a resin film as a dielectric, and a coil is formed by the spiral pattern. , Forming a capacitor electrode plate part in substantially the entire spiral pattern and providing a circuit having a circuit terminal part at one end, and electrically connecting both circuits to each other through the circuit terminal part to form a resonance frequency circuit. Since the double-sided coil type resonance tag is formed, there is an advantage that the performance can be improved and the size can be reduced.

Particularly, if the spiral pattern circuit provided on one surface of the resin film is formed smaller than the spiral pattern circuit provided on the other surface, the allowable range of deviation of the spiral pattern circuits on both surfaces is increased. Is widened, and it is easy to align the circuits in the spiral patterns on both sides of the resin film. Also, the resonance frequency can be appropriately changed by various means.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing an embodiment of a resonance tag according to the present invention.

FIG. 2 is a cross-sectional view of a resonance tag according to the above embodiment.

FIG. 3 is an equivalent circuit diagram of a resonance frequency circuit of the resonance tag according to the embodiment.

FIG. 5 is a plan view showing conductive portions of the resonance tag of the above-mentioned embodiment.

FIG. 6 is a characteristic diagram showing the relationship between the conduction point and the frequency shown in FIG.

FIG. 7 is an exploded perspective view showing an example of a conventional resonance tag.

FIG. 8 is a sectional view of a resonance tag of a conventional example as above.

FIG. 9 is an equivalent circuit diagram of a resonance frequency circuit of the resonance tag of the conventional example.

[Explanation of symbols]

 5 Resonance Tag 6 Resin Film 7 Metal Foil 7A Circuit Terminal 8 Metal Foil 8A Circuit Terminal

[Procedure amendment]

[Submission date] April 18, 1994

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] Brief description of the drawing

[Correction method] Change

[Correction content]

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing an embodiment of a resonance tag according to the present invention.

FIG. 2 is a cross-sectional view of a resonance tag according to the above embodiment.

FIG. 3 is an equivalent circuit diagram of the resonance frequency circuit of the resonance tag of the above-mentioned embodiment when the metal foil is not conducted.

FIG. 4 is an equivalent circuit diagram of a resonance frequency circuit of the resonance tag of the above-mentioned embodiment when the metal foil is made conductive.

FIG. 5 is a plan view showing conductive portions of the resonance tag of the above-mentioned embodiment.

FIG. 6 is a characteristic diagram showing the relationship between the conduction point and the frequency shown in FIG.

FIG. 7 is an exploded perspective view showing an example of a conventional resonance tag.

FIG. 8 is a sectional view of a resonance tag of a conventional example as above.

FIG. 9 is an equivalent circuit diagram of a resonance frequency circuit of the resonance tag of the conventional example.

[Explanation of Codes] 5 Resonance Tag 6 Resin Film 7 Metal Foil 7A Circuit Terminal 8 Metal Foil 8A Circuit Terminal

Claims (3)

[Claims] 1. A circuit having a spiral pattern on each of both surfaces of a resin film to be a dielectric, wherein a coil is formed by the spiral pattern, and a capacitor electrode plate portion is constituted by substantially the entire spiral pattern, A resonance tag characterized in that a circuit having a circuit terminal portion is provided at one end, and a resonance circuit that resonates with a radio wave of a specific frequency transmitted from the detection device is formed. 2. The resonance according to claim 1, wherein the circuit of the spiral pattern provided on one surface of the resin film is formed smaller than the circuit of the spiral pattern provided on the other surface. tag. 3. The resonance tag according to claim 1, wherein the resonance frequency of the resonance frequency circuit is variable.