JP2772389B2 - Resonant tag and method of manufacturing the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method in which a high-power electric field destroys an electrically insulating thin film layer, which is a derivative, and short-circuits both electrodes. And a method of manufacturing the same.

[Conventional technology]

In department stores, supermarkets, general retail stores, etc., various product protection measures are adopted to protect products from theft by shoplifting, etc. In order to be able to confirm the presence of the product, a tag having a thin-film planar printed circuit having a specific resonance frequency characteristic made of a flexible material is provided on the item to be protected. It is used by being adhered and fixed using an adhesive or the like, or suspended by a "string" that does not break easily. In the area controlled by the detection device, the tag detects and reacts to the resonance frequency transmitted from the device, so that the presence of the product can be detected and theft can be protected, but the sale of the product has been confirmed. In order to prevent the tag from responding to the resonance frequency transmitted from the detection device later in the control area, the printed circuit is destroyed by tearing the tag, etc. "Shield" the radio wave by attaching metal foil, or use a certain jig to mechanically make the dielectric thin film layer present in the capacitor part of the tag extremely thin. Thus, when a high output electric field is applied, a method is adopted in which both electrodes are easily short-circuited and the resonance frequency characteristic is lost.

[Problems to be solved by the invention]

If the printed circuit is destroyed by "tearing the tag", etc., or the resonance frequency characteristics of the tag are artificially erased by "pasting a metal foil such as aluminum foil on the tag", etc. Since it is performed individually, it takes time and is not suitable for processing a large amount of erasure.

On the other hand, the method of mechanically thinning the dielectric thin film layer to easily short-circuit both electrodes is manufactured by crushing the material constituting the tag in the thickness direction. If the thickness is not constant, a problem that the dielectric breakdown does not occur when the thickness of the dielectric thin film layer is increased easily occurs. An object of the present invention is to solve these problems and to provide a resonance tag capable of reliably and easily performing dielectric breakdown and short-circuiting of an electrode, and a method of manufacturing the same.

[Means for solving the problem]

The resonance tag of the present invention forms a resonance frequency circuit having a specific frequency made of a metal foil such as an aluminum foil on both surfaces of a dielectric made of a synthetic resin film thin film layer of polyethylene or the like. The circuit terminal portion of the capacitor is short-circuited, and an opening reaching the dielectric is provided in the capacitor electrode plate of at least one of the resonance frequency circuits, and the portion including the opening is pressed by a heated jig and both ends are pressed. The resonance frequency characteristic can be easily destroyed by setting the distance between the capacitor part electrode plates to a predetermined size.

The manufacturing method of the resonance tag of the present invention, in more detail, a synthetic resin film thin film layer such as polyethylene is used as a dielectric, and a metal foil such as an aluminum foil is bonded to both surfaces thereof, and gravure printing or the like is performed on both surfaces of the metal foil. According to the printing method, a resonance frequency circuit having a specific frequency is formed, and in the capacitor portion electrode plates in the both side circuits, one side electrode plate or, in the case of both side electrode plates, the same position on both sides. Print the etching resist ink so that a circular opening with a diameter of 0.3 mm or more and 2 mm or less is formed, so that they almost overlap with each other.
A circuit and an opening are formed by chemically etching, a circuit terminal portion composed of a metal foil on both sides of the circuit is short-circuited, and one side of the circuit is separated from a silicon paper or the like using an adhesive. Paste the paper pattern and apply a surface temperature of 200 ° C or higher around the opening provided in the electrode plate of the capacitor part on the opposite circuit.
Pressing with a jig heated to 50 ° C or less to make a predetermined size between the two electrode plates, gluing high quality paper or other paper to the capacitor electrode plate side with an adhesive, and kiss cutting to a predetermined size Become.

In this type of resonance tag, in order to easily short-circuit both electrodes of the capacitor section in a high output electric field, the metal foil interval between both electrodes needs to be maintained at 0.0003 mm or less. In order to obtain an interval of less than mm, in the present invention, an opening of a predetermined size reaching the insulator was provided only in the metal foil in the electrode plate of the capacitor part in the two-sided circuit, and the portion including the opening was heated. This is performed by pressing with a jig to make the thickness of the dielectric between the electrode plates near the opening a predetermined thickness.

The size of the opening provided in the capacitor part electrode plate depends on the thickness of the dielectric and metal foil, but it is usually 0.3 mm in diameter.
It is good to make it a circular shape of not less than 2 mm. However, since the opening is provided so that the synthetic resin, which is a dielectric, flows easily when the space between the electrode plates is heated and pressed, the shape thereof is not limited to a circular shape, and may be another shape, and the number provided is one. No need. Therefore, it may be provided on both sides of the capacitor part electrode plate in the circuit on both sides, in which case it is provided so as to substantially overlap at the same position on both sides, and preferably, the size of one opening is made larger than that of the other opening. good. When the opening is provided only on one electrode plate, it is advantageous to provide the opening toward the electrode plate made of thick metal foil.

The heating and pressing of the opening portion is performed by pressing the surface of the metal foil attached to the surface of the dielectric around the opening with a heated jig. In this case, the process may be performed with the circuit formed on the surface of the synthetic resin film thin film layer as a dielectric, or after the paper or the like is attached to one circuit surface. Usually, it is performed with a piece of paper stuck on one side because the handleability is improved. In that case, heat pressing is performed from the metal foil surface side. An adhesive such as an adhesive may be applied to one side where the circuit is provided, and a release paper such as silicon paper may be attached.

The heating pressure depends on the type of the synthetic resin as the dielectric, but in the case of a thermoplastic resin such as polyethylene, it is preferable to press with a jig heated to a surface temperature of 200 ° C. or more and 250 ° C. or less. If the size of the opening is limited to not less than 0.3 mm and not more than 2 mm, press the jig with a tip having a circular tip with a tip diameter of 2 mm or more and 5 mm or less to enable effective contact, and press the gap between both electrodes. It has a predetermined size. When a metal foil such as an aluminum foil around the opening is pressed with a jig heated to a surface temperature of 200 ° C or more and 250 ° C or less, the heat of this temperature causes the edge between the metal foils such as the aluminum foil on both sides around the opening to be pressed. By melting and shrinking the existing synthetic resin film thin film layer, it is possible to form an ultrathin film having a thickness of 0.0003 mm or less, so that a distance between electrode plates capable of dielectric breakdown can be obtained.

Normally, the diameter of the circular opening is limited to 0.3 mm or more and 2 mm or less, because 0.3 mm or more is determined by the printing limit of the printing method at the time of mass production, and 2 mm or less is the resonance in electrical characteristics. This is due to two reasons from frequency design adjustment limits. In addition, the effective contact tip of the heated circular jig is limited to 2 mm or more and 5 mm or less.
When the diameter of the opening is 2 mm and the jig diameter is 2 mm,
From the precision of the production equipment used, the dielectric consisting of a thin film layer of a synthetic resin film such as polyethylene existing in the opening is determined because the risk of melting and breaking easily occurs,
5mm or less, if the metal foil used is aluminum foil,
Because its thermal conductivity is good, the larger the diameter is, the worse the heat concentration effect is, the thermal melting of the synthetic resin film thin film layer is not uniform, and it is difficult to obtain a stable inter-electrode distance between dielectric plates. is there.

In the present invention, in addition to polyethylene and polypropylene, a plastic film such as polyester can be used as the dielectric, but a polyolefin-based material such as polyethylene or polypropylene is preferable from the viewpoint of cost and workability. As described above, the thinner the dielectric, the better. However, the thickness is limited due to manufacturing restrictions. However, in the present invention, a dielectric having a thickness of 30 μm or less can be used satisfactorily.

In the present invention, the metal foil is not particularly limited, but the price,
Aluminum foil is preferred from the viewpoint of workability and the like, and its thickness can be used in a range normally used for this kind of application, but it is particularly around 50μ on the resonance frequency circuit side and 10μ on the non-resonance frequency circuit side. Used before and after.

After printing, the metal foil is chemically etched to form a circuit and an opening, and the circuit terminals formed by the metal foil on both sides are short-circuited. The release paper is laminated, but as the release paper, it has an effective release property to any adhesive used, and has an effective buffering property when pressed with a heated jig It is preferable to select one having paper quality and thickness.
The adhesive used is for various glass products used in the high temperature range from -20 ° C to 40 ° C, synthetic resin films such as polyethylene, polypropylene, polyester, etc., or products coated with resin. It is necessary that the adhesive has such an adhesive strength that it is not easily peeled off even when an external force is applied for a certain period of time.

On the capacitor part electrode plate side of the resonance tag, paper such as high quality paper on which printing or the like has been applied is laminated with an adhesive according to a conventional method.

〔Example〕

Hereinafter, an embodiment of the present invention will be described with reference to the drawings, but the present invention is not limited thereto.

As shown in FIG. 1, a tag having a resonance frequency has a dielectric material 2 having an electromagnetic value "dielectric loss tangent" having a thickness of 0.03 mm or less, a polyolefin resin film such as polyethylene or other synthetic resin film. And a material in which metal foils 1 and 3 such as aluminum foil are bonded to both surfaces of this film (dielectric 2) by a method such as extrusion or thermocompression bonding is used as a substrate material.

Among the metal foils used, in particular, in the case of an aluminum foil, the purity of aluminum is desirably 99.0% or more and 99.7% or less in view of electrical properties, suitability for processing such as bonding or etching, and physical properties of the product.

Among the metal foils to be bonded to both sides of a resin film such as polyethylene as the dielectric 2, one of the metal foils 1
Is used as an LCR circuit and a circuit terminal. When the metal foil is an aluminum foil, a foil having a thickness of 0.050 mm or more and 0.060 mm or less is desirable. Metal foil 3 on the opposite side of this metal foil
Is used as a capacitor electrode plate and a circuit terminal part, when the metal foil is aluminum foil, 0.006 mm or more, 0.0
A foil with a thickness of 10 mm or less is used.

In order to obtain a specific resonance frequency, the ink 4 having an anti-etching property by using various printing methods, for example, gravure printing, silk screen printing, flexographic printing, letterpress printing, etc., on both sides of the substrate material, that is, on the metal foil, is used. (Fig. 2)
2 and the metal foil is printed so that an opening 7 is formed on one side of the metal foil, and then chemically etched using a chemical such as an acid or an alkali. Such a resonance frequency circuit is formed. Although the opening 7 is formed in the metal foil 1 in the example of FIG. 2, the opening 7 may be provided in the metal foil 3 or provided in both the metal foils 1 and 3 with the dielectric 2 interposed therebetween. May be.

Subsequent to the etching process, circuit terminals 5, 6 of metal foils 1, 3 on both surfaces of a resin film (dielectric 2) of polyethylene or the like.
Using a special jig, a short circuit is conducted as shown in FIG. 3 by mechanical work such as breaking and crushing a resin film such as polyethylene to complete a resonance circuit.

Subsequently, an adhesive 8 having sufficient adhesive strength is applied to the surface of the circuit I (metal foil 1) to papers, synthetic resin films, glass bottles, and the like, and a release paper 9 such as silicone paper is attached (fourth). Figure).

In order to break the electrical insulation of the resin film thin film layer of dielectric such as polyethylene (dielectric 2) and easily short-circuit the metal foils 1 and 3 which are both electrodes in a high output electric field, the metal of both electrodes is required. The foil spacing must be kept below 0.0003mm. In order to obtain a constant electrode spacing of 0.0003 mm or less, in the present invention, as shown in FIG. 5, the periphery of the opening 7 in the capacitor electrode plate in the circuit I surface (metal foil 1) formed by etching. The surface from the capacitor part electrode plate on the other side of the circuit II surface (metal foil 3) is 200 ° C or higher and 250 ° C
Pressing is performed using a circular jig heated to the following temperature and having a tip diameter capable of effective contact of 2 mm or more and 5 mm or less. The dielectric member 2 made of a synthetic resin film such as polyethylene existing between the metal foils 1 and 3 around the opening 7 is melted and shrunk by heating and pressing, so that an ultrathin layer film of 0.0003 mm or less can be formed. Therefore, the distance between the electrode plates that can cause dielectric breakdown can be obtained. After the area around the opening is heated and pressed, as shown in FIG. 6, a paper 11 such as a high-quality paper is stuck on the electrode side of the condenser section using an adhesive 10, and the tag is completed by kiss cutting to a predetermined size. Needless to say, printing or the like is performed on the paper 11 such as high-quality paper.

〔The invention's effect〕

As described above, the present invention presses the periphery of the opening provided in the capacitor electrode plate in one side or both sides of the circuit with a jig heated from the circuit II side (metal foil 3) side.
Since the synthetic resin film thin film layer such as polyethylene of the dielectric material 2 existing between the three melts and shrinks, it is very stable as compared with an ultra thin film layer capable of dielectric breakdown of 0.0003 mm or less by applying an external force mechanically. The obtained distance between the electrodes can be obtained.

[Brief description of the drawings]

1 to 6 are views for explaining a method of manufacturing the resonance tag of the present invention, and show schematic cross-sectional views of a laminated material obtained in each step. FIG. 7 is an exploded perspective view showing one example of a resonance tag. FIG. In the figure, 1, 3 ... metal foil 2 ... dielectric 4 ... etching resistant ink 5, 6 ... circuit terminal 7 ... opening 8 ... adhesive 9 ... release paper 10 ... adhesive 11 …… Paper

Claims (4)

(57) [Claims] 1. A resonance frequency circuit having a specific frequency made of a metal foil such as an aluminum foil is formed on both sides of a dielectric made of a synthetic resin film thin film layer of a polyethylene or the like. An opening reaching the dielectric surface is provided only in the metal foil in the electrode plate of the capacitor portion of at least one of the resonance frequency circuits, and the portion including the opening is pressed by a heated jig. A resonance tag having a predetermined distance between the electrode plates of the two capacitors. 2. The resonance tag according to claim 1, wherein the size of the opening provided in the metal foil in the capacitor part electrode plate is a circle having a diameter of 0.3 mm or more and 2 mm or less. 3. The resonance tag according to claim 1, wherein said openings are provided at substantially corresponding positions in the capacitor plate on both sides of the dielectric. A synthetic resin film thin film layer of polyethylene or the like is used as a dielectric, and a metal foil such as an aluminum foil is stuck on both sides thereof, and a specific method is applied to both sides of the metal foil by a printing method such as gravure printing. A circular shape having a diameter of 0.3 mm or more and 2 mm or less so that a resonance frequency circuit having a frequency of An etching resist ink is printed so as to form an opening, and a circuit and an opening formed of the metal foil are formed by chemically performing an etching process, and a circuit terminal portion formed of the metal foils on both sides is formed. The circuit is short-circuited, release paper such as silicon paper is adhered to one circuit side using an adhesive, and the surface temperature around the opening provided in the capacitor electrode plate of the opposite circuit
Press with a jig heated to 200 ° C or more and 250 ° C or less to make the distance between the two electrode plates a predetermined size, glue high quality paper or the like to the capacitor electrode plate side with an adhesive, and kiss cut to a predetermined size A method of manufacturing a resonance tag, comprising: