JP3306560B2 - Resonance tag - Google Patents

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 a resonance tag and 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 (resonant tag) is attached to a product to prevent shoplifting. This resonance tag
Removed at the time of payment 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 resonance tag attached to the product, a warning will be issued by a buzzer or lamp etc. Has become.

Conventionally, generally well-known resonance tags are configured as shown in FIGS. 7 and 8 (Japanese Patent Laid-Open Nos. 1-129396 and 1-27).
No. 7791). That is, the resonance tag 1 uses a polyolefin-based resin film such as polyethylene or another synthetic resin film 2 as a dielectric, and extrudes metal foils 3 and 4 such as aluminum foil on both surfaces of the resin film (dielectric) 2. Alternatively, a material bonded by a method such as thermocompression bonding is manufactured as a substrate material.

[0004] Among the metal foils 3 and 4 bonded to both surfaces of the resin film 2 as the dielectric, one of the metal foils 3 is a circuit of a spiral pattern, and a coil is formed by the spiral pattern. At the same time, it is used as a circuit having both ends of a capacitor electrode plate portion 3A and a circuit terminal portion 3B, and the metal foil 4 on the opposite side of the metal foil 3 is used as 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 sides of the above-mentioned substrate material, that is, on the metal foils 3 and 4 using an ink having an etching resistance by various printing methods. After that, a chemical etching process is performed using a chemical such as an acid or an alkali to form a resonance circuit.

In order to form a resonance circuit, the circuit terminal 3B of the spiral-shaped circuit of the metal foil 3 on one side is connected to the circuit terminal 4B of the metal foil 4 on the opposite side. As a connection method, a so-called pressure welding method or the like is used in which both metal foils 3 and 4 are crushed up and down with a hard substance having an uneven surface. Due to 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 conductive and short-circuited. Due to this short circuit, a resonance circuit including three elements of the resistance R, the inductance L, and the capacitance (capacitor capacitance) C is formed, and the resonance tag 1 has a resonance frequency.

FIG. 9 shows an equivalent circuit of the resonance circuit. The metal foils 3 and 4 and the dielectric 2 form a capacitor, and the resistance is formed by the resistance of the metal foils 3 and 4 itself.
The resonance frequency f of this equivalent circuit is f = 1 / {2π} (L
C) As｝, when a signal of this frequency is given from the detection device of the gate, it resonates and its presence is detected.

[0008]

However, in such a conventional resonance tag 1, a circuit having a spiral pattern is formed only on one side of the resin film 2, and a coil is formed by the spiral pattern. In addition, 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, has the following disadvantages.

That is, since the single-sided coil type is used, when the size of the resonance tag 1 is limited to a small size, the size of the coil and the capacitor is limited. This is disadvantageous in terms of performance, for example, there is a limitation in expanding the variable range. Therefore, in order to reduce the size as much as possible, performance must be sacrificed. Conversely, if the performance is advantageous, the size cannot be reduced.

The present invention has been made in view of the above-mentioned conventional problems, and is intended to improve the performance of the resonance tag and reduce the size by using a double-sided coil type resonance tag in place of the conventional single-sided coil type resonance tag. Aim.

[0011]

Accordingly, the present invention provides a circuit having a spiral pattern on both sides of a resin film serving as a dielectric, wherein a coil is formed by the spiral pattern and a spiral pattern is formed. Substantially, a capacitor electrode plate portion was formed, and a circuit having a circuit terminal portion at one end was provided to form a resonance circuit that resonated with a radio wave of a specific frequency transmitted from the detection device.

In particular, it is preferable that 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.

[0013]

In such a configuration, 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)}, etc., and when a signal of this frequency is given from the detection device, resonance occurs, and the presence thereof is detected.

According to this resonance tag, since it is a double-sided coil type, even when 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. This is advantageous in terms of performance, for example, it is possible to form a type having a low frequency, and there are few restrictions when extending the variable range of the frequency.

When manufacturing a resonance tag, it is necessary to provide a spiral pattern circuit on both sides of the resin film without shifting. In the case where the circuit of the spiral pattern of the same size is provided on each side of the resin film, the allowable range of the shift becomes narrow, and it is difficult to align the circuit of the spiral pattern on each side of the resin film.

However, by forming the circuit of the spiral pattern provided on one surface of the resin film smaller than the circuit of the spiral pattern provided on the other surface, the allowable range of the displacement becomes wider, Alignment of the circuit of the helical pattern on each side is easy.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the accompanying drawings. In FIGS. 1 and 2, the resonance tag 5 is a circuit of 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 capacitor electrode plate portion is formed, and a circuit having a circuit terminal portion at one end is provided to form a resonance frequency circuit.

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

Among the metal foils used, aluminum foil is particularly preferable because of its electrical properties, appropriate processing such as bonding or etching, and physical properties of the product, the purity of aluminum is 99.0% or more and 99% or more. 0.7% or less is desirable.

The metal foils 7 and 8 bonded to both sides of the resin film 6 as a dielectric are circuits of a spiral pattern, respectively, and form a coil by the spiral pattern and substantially the entire spiral pattern. Is used as a circuit having circuit terminal portions 7A and 8A at one end, and when the metal foils 7 and 8 are aluminum foils, the thickness of the foil is 0.040 mm or more and 0.060 mm or less. 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. are used on both sides of the above-mentioned substrate material, ie, on the metal foils 7 and 8. A “resonance frequency circuit” is printed using ink having etching resistance, and then chemically etched using a chemical such as acid or alkali to form a resonance circuit.

The resonance circuit may be used as it is, but it may be used at an appropriate position in the spiral pattern circuit of the metal foil 7 on one side, for example, the circuit terminal portion 7A and the spiral pattern of the metal foil 8 on the opposite side. May be connected to an appropriate position, 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 broken by a pressure welding method or the like, and the metal foils 7 and
8 is conductively 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. A capacitor is formed by the metal foils 7 and 8 and the resin film 6, and the resistance is equal to that of the metal foils 7 and 8A. 8 is formed by the resistance of itself. The resonance circuit of this equivalent circuit becomes f = {2 / {2π} (LC)}. When a signal of this frequency is given from the detection device of the gate, it resonates and its existence is detected.

FIG. 4 shows an equivalent circuit of a resonance circuit of the resonance tag 5 having a configuration in which the metal foils 7 and 8 are conducted. The resonance frequency of this equivalent circuit is f = 1 / {2π} (2L
C) As 、, a resonance frequency about half that of the case where no conduction is obtained is obtained.

Here, in FIG. 2, reference numerals 9 and 10 denote the adhesive layers 1 on both surfaces of the substrate material, respectively.
It is a high quality paper and a release paper adhered through the first and second sheets.

According to the resonance tag 5 having the above configuration, 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 it is advantageous in terms of performance such that there is little restriction in expanding the variable range of the frequency.

The effects are summarized as follows. (1) By reducing the line width and line width of the spiral pattern, it is possible to manufacture even a low frequency type. (2) By reducing the line width and line width of the helical pattern, the size can be reduced while maintaining the same performance. (4) The variable range of the frequency can be expanded. (5) If the width of the spiral pattern on one side is reduced, the resonance performance does not decrease.

The application of the resonance tag 5 is as follows.
In addition to the above-mentioned use for shoplifting prevention, there are the following effective uses. In other words, by sewing the resonance tag 5 to the surgical gauze, if the surgical gauze accidentally remains in the human body during the operation, this can be detected. In addition, by carrying the resonance tag 5 to an elderly person with senile dementia, if the elderly person wanders unnecessarily, this can be detected.

Furthermore, a system in which the resonance tag 5 is combined with a recently developed color code and a camera (reading mechanism) can be considered. Here, first, the Karla code will be described.
Information can be coded by a combination of filling two squares, and the coding system can be freely coded except that there are rules for the combination to be filled.

The system in which the resonance tag 5, the Karla code, and the camera are combined is effectively used, for example, for checking entry / exit of an event, a marathon event, checking a ski lift ticket, and carrying out distribution.

The marathon runner will now be described. The resonance tag 5 and a paper on which a color code for identifying the runner is printed are sewn on the bib of the marathon runner, so that the marathon runner can reach the goal. Then, the presence of the resonance tag 5 is detected, the camera is automatically turned on, the carla code of the number is read, and the runner is identified.

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

That is, when manufacturing the resonance tag 5, it is necessary to provide a spiral pattern circuit on both surfaces of the resin film 6 without shifting. In the case where the circuit of the spiral pattern of the same size is provided on each of both surfaces of the resin film 6, the allowable range of the shift becomes narrow, and it is difficult to align the circuit of the spiral pattern on each surface of the resin film 6.
However, the circuit of the spiral pattern provided on one surface of the resin film 6 is formed smaller than the circuit of the spiral pattern provided on the other surface. The positions of the resin films 6 coincide with each other, that is, the allowable range of the displacement is widened.
This facilitates the alignment of the spiral pattern circuits on both sides.

For example, when the resonance tag 5 is used in a shoplifting prevention system, if the resonance frequency is changed in accordance with the type of the product to be attached, the type of the shoplifted product can be immediately known from the frequency. Can be. For such demands and convenience, it is also possible to adopt a configuration in which the frequency of the resonance tag 5 is 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 capacitance of the capacitor (cutting method), a method other than the circuit terminal portions 7 A and 8 A, Examples of the method include a method of increasing the conduction position of the metal foils 7 and 8 and a method of changing the conduction position of the metal foils 7 and 8. In addition, as the means for conducting, in addition to the above-described pressure welding method, an ultrasonic bonding method, a heat fusion method, and a dimple bonding method (dimple processing is performed on a portion to be conductive, and the amplified resonance frequency is received. A method of conducting the dimple portion) can be used.

The cutting method or the above various conducting means may be applied before supplying the resonance tag 5 to the user. In this case, the position is appropriately adjusted in advance so as to have a frequency according to the request of the user. Cutting, conduction at a plurality of locations, or conduction at appropriate positions. If 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 to determine which position should be cut and how much the frequency will be. What is necessary is just to cut it. The same applies to the case where the number of conductive points is increased or changed. Further, using the computer storing the relationship between the cut position or the conduction position and the frequency and the dot printer connected thereto, the user inputs an arbitrary frequency and sets the resonance tag 5 at a predetermined position of the printer. For example, a configuration in which an appropriate position is automatically cut or made conductive may be adopted.

Here, FIGS. 5 and 6 are views showing the above-mentioned frequency change state for reference. FIG. 5 is a plan view showing an example of the resonance tag 5. It can be seen that changing the conduction points from A to R shown in FIG. 5 changes the frequency as shown in FIG. Note that the above-described frequency variable means 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 intended that the invention be limited to these embodiments, but that the invention be limited to the claims appended hereto by those skilled in the art. It should be noted that various changes and modifications can be made without departing from the invention.

[0039]

As described above, according to the resonance tag of the present invention, a circuit having a spiral pattern is formed on both sides of a resin film serving as a dielectric, and a coil is formed by the spiral pattern. A capacitor electrode plate portion is formed substantially entirely over the spiral pattern, and a circuit having a circuit terminal portion at one end is provided, and both circuits are electrically connected to each other via the circuit terminal portion to form a resonance frequency circuit. Since the double-sided coil type resonance tag is formed, there are advantages such as downsizing while improving performance.

In particular, if 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, the allowable range of the deviation of the circuit of the spiral pattern on both surfaces is provided. This is advantageous in that the circuit of the spiral pattern on each side of the resin film can be easily aligned. Further, the resonance frequency can be appropriately changed by various means.

[Brief description of the drawings]

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

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

FIG. 3 is an equivalent circuit diagram of a resonance frequency circuit of the resonance tag of the embodiment when the metal foil is not conductive.

FIG. 4 is an equivalent circuit diagram of a resonance frequency circuit of the resonance tag of the embodiment when the metal foil is conducted.

FIG. 5 is a plan view showing a conduction portion of the resonance tag of the embodiment.

FIG. 6 is a characteristic diagram showing a relationship between a conduction point and a frequency shown in FIG. 5;

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

FIG. 8 is a cross-sectional view of the resonance tag according to the related art.

FIG. 9 is an equivalent circuit diagram of a resonance frequency circuit of the resonance tag according to the related art.

[Explanation of symbols]

 5 Resonance tag 6 Resin film 7 Metal foil 7A Circuit terminal 8 Metal foil 8A Circuit terminal

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) G08B 13/00-15/02 H01F 17/00 H01Q 11/12 H03H 3/02 G01S 13/82

Claims (1)

(57) [Claims] 1. A circuit having a spiral pattern on both sides of a resin film serving as a dielectric, wherein a circuit having a spiral pattern provided on one surface is smaller than a circuit having a spiral pattern provided on the other surface. To form a double-sided coil to form a coil by the spiral pattern,
In a resonance circuit that constitutes a capacitor electrode part substantially over the spiral pattern overlapping the front and back, and a circuit having a circuit terminal part at one end, and resonates with a radio wave of a specific frequency,
A resonance tag characterized in that the resonance frequency can be varied by conducting and electrically connecting the resonance frequency in advance in an arbitrary spiral pattern portion by caulking, through holes, ultrasonic waves, soldering or the like.