JP2899781B2 - 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 provided with a circuit that resonates with a radio wave of a specific frequency transmitted from a detection device.

[0002]

2. Description of the Related Art As is already known, a resonance tag is a tag provided with a circuit that resonates with a radio wave of a specific frequency, and this resonance tag is present in an area where a radio wave of a specific frequency is emitted. Due to the resonance, the buzzer and the warning lamp of the detection device can be operated. Therefore, in a department store, a discount store, a video rental store, a CD shop, and the like, the resonance tag is attached to a product or the like and used to prevent shoplifting and the like. This resonance tag is removed or the resonance circuit is destroyed at the time of payment at the cash register, but the customer does not pay the price and passes through the gate equipped with the specific detection device with this resonance tag attached to the product Then, a warning is issued by a buzzer, a lamp, or the like.

A resonance tag is basically composed of a plastic film as a dielectric, a spiral (coil-shaped) circuit formed on at least one surface of the film, and a circuit for a capacitor electrode plate formed on the other surface. It is a spiral circuit that also serves as a capacitor, and is laminated on a base sheet such as paper as necessary. FIG. 6 shows an example of a typical resonance tag. In the figure, 22 is a plastic film as a dielectric, 23 is a spiral circuit formed of metal foil, and 24 is a circuit for a capacitor electrode plate made of metal foil. Spiral circuit
23 is a capacitor electrode plate 23A at one end as shown in the figure,
A circuit terminal portion 23B is formed at the other end, and a capacitor electrode plate portion 24A and a circuit terminal portion 24B are also formed in the capacitor electrode plate circuit 24 to correspond to the circuit terminal portion 23B. Circuit terminal section 23B
And 24B are plastic films 22 by physical means such as pressure welding.
The layers are destroyed and connected to form a resonance circuit, and the resonance tag
21 is made. In addition to the example shown in FIG. 6, a spiral circuit is formed on both sides of a plastic film without forming a capacitor electrode plate at the end of the spiral circuit, and the circuits are formed so as to correspond to each other with the plastic film interposed therebetween. Accordingly, a circuit in which the circuit itself has a role of a capacitor electrode plate has been proposed.

A resonance circuit is composed of a resistance R, an inductance L and an electrostatic capacitance (capacitor capacitance) C. The capacitor capacitance C is a plastic (resin) film as a dielectric and a spiral circuit formed on both surfaces thereof. The resistor R is formed by a metal foil forming a circuit. From these facts, in order to obtain a predetermined resonance frequency required for a resonance tag, a material configuration capable of obtaining extremely accurate dimensions and their tolerances is required.

[0005]

For the above-mentioned reasons, a spiral circuit is conventionally made of a plastic film as a dielectric material, which is formed by laminating a metal foil such as an aluminum foil on one or both sides of a plastic film. In the same manner as in the above method, an etching resistant ink is printed on a metal foil on a plastic film in a predetermined pattern and etched with a chemical such as acid or alkali, or formed by a photoresist etching method. However, this etching method using a chemical solution requires a certain time for the metal foil to dissolve, and has problems such as disposal of the etching solution.

Conventionally, as a plastic film used as a dielectric, an extruded film of polyethylene or the like is usually used, but it has various adjustment conditions such as a slit width of a forming die and an extruding pressure of a resin. Therefore, there is a problem that the lower limit of the thickness in forming is limited, and there is a limit in tolerance of the thickness. Lamination of these plastic films and metal foil, there is a method of hot-pressing the extruded semi-molten resin film to the metal foil and a method of bonding the formed film to the metal foil with an adhesive, Any of these methods is likely to cause variations in the dielectric layer. Also, since the molded plastic film has a strong coating property, it is not easy to connect the circuits on the front and back surfaces of the plastic film for forming the resonance circuit, or furthermore, the resonance circuit is destroyed (erasing the resonance characteristics).
It is also not easy.

An object of the present invention is to solve the above-mentioned conventional problems, and an object of the present invention is to provide a resonance tag which is easy to manufacture and has stable resonance characteristics.

[0008]

Means for Solving the Problems In order to solve the above-mentioned problems, the present inventors have conducted intensive studies and as a result, the dielectric layer has been formed by a method of applying a resin liquid instead of a conventionally used molded resin film. And by bonding the metal foil circuit using the resin coating film as an adhesive, a dielectric layer having a desired thickness can be obtained, whereby a resonance tag having excellent resonance frequency characteristics can be obtained. The inventors have found that the present invention can be obtained and completed the present invention.

Therefore, the resonance tag of the present invention is characterized in that a circuit-shaped (coil-shaped) metal foil is bonded to both sides or one side of a dielectric resin coating film formed by applying a resin liquid. . In the present invention, the dielectric resin coating may be the same coil shape as the coil-shaped metal foil, and is a resin coating having an area shape substantially equal to the size of the outer peripheral shape of the coil-shaped metal foil. Is also good.

Specifically, for example, a resin coating film is formed on one surface of the metal foil before being drawn into a coil shape, and then the metal foil with the resin coating film is drawn into a coil shape. A resin film of a shape may be formed, or a resin liquid is applied to the surface of release paper to form a resin film, and a coil-shaped metal foil is attached to the surface of the resin film to form a release paper. After peeling, a coil-shaped metal foil on the back side may be bonded to the resin coating surface on the release paper side. other than this,
After a coil-shaped metal foil is laminated on the release paper surface and a liquid resin is applied from the surface to form a resin coating film, the coil-shaped metal foil may be bonded on the resin coating film.

The resin liquid used in the present invention may be a liquid itself, that is, a solventless resin liquid such as an epoxy resin, or a solution resin liquid dissolved by a solvent. As the resin, any resin suitable for application and having excellent dielectric properties can be used, and examples thereof include polyolefin. It is preferable that the formed resin coating film can function as an adhesive at the time of bonding with a metal foil, and therefore, a resin film having thermal adhesion is more preferable. In the resin coating film, if necessary, a filler or the like capable of improving or improving the dielectric properties of the coating film can be included.

The resin coating does not need to be on one side of the coiled metal foil, but may be provided on both sides. Alternatively, two or more coiled metal foils provided with a resin coating film on at least one surface may be laminated and bonded, and the metal foils of each layer may be connected by appropriate means to obtain desired resonance characteristics. In forming the resin coating film, the application of the resin liquid may be performed over the entire surface by roll coating, or may be performed in a predetermined pattern by gravure printing, silk screen printing, or the like. Furthermore, a resin solution containing a conductive filler such as metal powder is applied to a part of the metal foil circuit by a multicolor printing method, and this coating connects the coiled metal foils on both sides of the dielectric resin coating. Thus, a desired resonance circuit may be formed, or the resonance circuit may be easily broken using the resin coating film containing the conductive filler.

[0013] At least one surface of the resonance tag base material in which a coil-shaped metal foil as a resonance circuit is bonded to both surfaces of the resin coating film as described above, is provided with a support such as paper, plastic film or sheet by a conventional method. The desired resonance tag can be obtained by attaching the decorative sheet. For example, paper and a plastic film are adhered to one surface of the resonance tag base material with an adhesive, an adhesive is applied to the other surface of the base material, and a release paper is bonded to the upper surface, and the release paper is peeled off. It can be a resonance tag that can be directly attached to a product. Conventionally, since a non-adhesive film such as a polyethylene film was used as a dielectric,
Although it was necessary to attach the support with an adhesive,
In the case of the present invention, since a resin coating film is used, a normal adhesive can be used.

[0014]

According to the present invention, since the dielectric layer is formed by applying a resin liquid, it is possible to form a dielectric film which is far superior in thickness tolerance in comparison with a conventional plastic film formed by extrusion or the like. it can. Further, since the resin film is directly used as the adhesive, the thickness variation due to the use of the plastic film and the adhesive can be avoided as compared with the conventional case where the plastic film is bonded using the adhesive. Furthermore, since a resin can be selected in a wide range and a filler or the like capable of improving dielectric properties can be blended in an arbitrary ratio in a resin coating film or two or more resins can be arbitrarily blended, It is possible to improve the resonance frequency characteristics and obtain a resonance tag having any flexibility. In addition, in the present invention, since a resin coating film is formed on at least one surface of the metal foil, operations such as removing the metal foil in a coil shape can be easily performed.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings, but the present invention is not limited to these embodiments.

FIG. 1 is an exploded perspective view showing an example of the resonance tag of the present invention, and shows an example in which a resin coating film 2 as a dielectric layer is formed in the same shape as an aluminum foil 3a which is removed in a coil shape. In the figure, the resin coating 2 is separated from the aluminum foil 3a.
However, the resin solution is applied to the aluminum foil, and the aluminum foil 3a is punched in a coil shape together with the aluminum foil 3a.
The resin coating film 2 is integrally formed on the a surface. In the figure, 3
Reference numeral b denotes a coil-shaped aluminum foil, which is laminated on the resin coating 2 so as to overlap the aluminum foil 3a with the coil. When the resin coating film 2 is a heat-adhesive resin, the bonding is performed by heat-pressing the aluminum foils 3a and 3b in a state where they are overlapped or the support 4 is further stacked. In the case of this example, a resin coating film 2 is formed on the aluminum foil 3b in the same manner.
Are laminated, the adhesive 5 is applied, and the release paper 6 is attached. On the other hand,
A paper 8 is attached to the upper surface of the aluminum foil 3a with an adhesive or an adhesive 7 to obtain a target resonance tag 1. Since the paper 8 is used for the purpose of protecting the resonance circuit thereunder and concealing the circuit, the paper 8 is printed with a display of merchandise and a store, and advertising characters.

FIG. 2 shows another embodiment of the present invention, in which the resin coating is a resin coating 2a having the same size as the outer peripheral shape of the coiled aluminum foil 3a. Other configurations are the same as those in FIG. 1, and thus the same reference numerals are given and the description is omitted. In the case of this example, the resin coating film 2a is described as a flat film. However, since the coating film may be formed by applying a resin liquid on the entire surface of the coil-shaped aluminum foil, the coil may be formed of an aluminum foil coil. A shape in which a resin coating film exists between the coils, that is, a shape having a coil-shaped convex portion on a plane can be employed. By doing so, the insulation of the aluminum foil on both the front and back surfaces of the resin coating can be more reliably ensured.

FIG. 3 shows an example in which a coil-shaped resin coating 2 and a planar resin coating 2a are used in combination. As a lamination method,
When the support 4 is a plastic film, a coiled aluminum foil 3b provided with a coiled resin coating 2 on one side is bonded to the support 4 with the resin coating 2, and then the resin coating 2 is formed. A resin liquid may be applied to the entire surface of the aluminum foil 3b, including the surface of the support 4 visible between the coils, on the surface side of the uncoated aluminum foil 3b to form the resin coating film 2a.

FIG. 4 shows an example in which a conductive or semiconductive resin coating 2b mixed with a conductive substance such as aluminum powder and copper powder is formed in the middle of the resin coating 2 using a multicolor printing technique. It is. In this example, the conductive foil is provided in the middle of the aluminum foil circuit. However, a conductive resin coating may be linearly provided on the outermost surface 2c of the coil, and may be used as a connection point for conducting the metal foil laminated on the front and back surfaces of the resin coating 2. good.

FIG. 5 shows an example in which a large number of coiled aluminum foils provided with the resin coating of the present invention are laminated. In this example, three aluminum foils 3 are laminated. In the drawing, reference numeral 10 denotes a position where the upper and lower aluminum foils are joined. By joining a large number in this way, it is possible to obtain a smaller resonant tag having predetermined resonance characteristics.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing an example of the present invention.

FIG. 2 is an exploded perspective view showing another example of the present invention.

FIG. 3 is an exploded perspective view showing another example of the present invention.

FIG. 4 is a perspective view showing an example in which a conductive resin coating film is provided on a part of the resin coating film.

FIG. 5 is an exploded perspective view showing an example of a resonance tag in which a number of coiled metal foils are stacked.

FIG. 6 is an exploded perspective view showing an example of a conventional resonance tag.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Resonance tag 2 Resin coating film 3 Aluminum foil 4 Support body 5 Adhesive 6 Release paper 7 Adhesive 8 Paper

Claims (7)

(57) [Claims] At least two circuit-shaped metal foils are synthesized. A dielectric resin coating formed by applying a resin solution is bonded to both surfaces of the dielectric resin coating with the metal foils facing each other. The dielectric resin coating formed between the metal foils
A conductive coating with a conductive material mixed between the films
And a resonance tag. 2. The circuit according to claim 1, wherein the dielectric resin coating film is formed in the same shape as the shape of the circuit-shaped metal foil.
The described resonance tag. 3. The resonance tag according to claim 1, wherein the dielectric resin coating is laminated between the metal foils in a shape having the same area as the outer peripheral shape of the circuit-shaped metal foil. 4. The resonance tag according to claim 1, wherein the dielectric resin coating is made of a thermo-adhesive resin. 5. The resonance tag according to claim 1, wherein the winding directions of the circuit (coil) -shaped metal foils bonded via the resin coating film are different from each other. . 6. A metal foil having a resin coating film is formed by applying a heat-adhesive dielectric resin solution to at least one surface of the metal foil, and the metal foil with the resin coating is punched into a circuit shape. A method for producing a resonance tag, comprising: laminating a resin foil with another circuit-shaped metal foil, and thermally bonding the resin foil with the resin foil. 7. A release paper is formed by applying a thermo-adhesive dielectric resin solution to a synthetic resin coating film having substantially the same size as the outer peripheral shape of the circuit-shaped metal foil. Laminating a circuit-shaped metal foil, peeling off the resin coating from the release paper, stacking another circuit-shaped metal foil on the peeled surface of the resin coating, and thermally bonding with the resin coating. Method of manufacturing resonant tags.