JPS63279399A - Sheet type resonance circuit and method using same for prevention against copy of document and robbery of article - Google Patents

Abstract

PURPOSE:To obtain a thin paperlike resonance circuit which is easily manufactured and has high reliability by obtaining a resonance circuit which is formed on thin insulating film as a thin layer circuit pattern of a high polymer material having conductivity itself. CONSTITUTION:This resonance circuit is a sheet type circuit to be tested which resonates with an electromagnetic wave of specific frequency and has the thin layer circuit pattern formed of the higher polymer material which has conductivity itself on the thin insulating film. Namely, a conductor part is formed of the higher polymer material which has conductivity itself, TICLE i.e. electronic conductive higher polymer material of >=10<-1>S/cm<2> in electric conductivity. There are polyazulene, polyparaphenylene, polypyrrole, polythiophene, etc., as this high polymer material. This resonance circuit is thinner and more paperlike than usual, so there is not sense of incongruity and there is no danger of peeling, disconnection, etc.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a sheet-like resonant circuit in which a circuit pattern is formed from a conductive polymer material.

[Prior Art] Electronic protection systems using resonant circuit tags that resonate at a specific frequency have been put into practical use, but recently there has been an increase in the number of copies of these documents from the standpoint of preventing copying of confidential documents or protecting the copyright of books, etc. , there are attempts to use it to prevent reading.

That is, a sheet-shaped resonant circuit that resonates with electromagnetic waves of a specific frequency is present in at least a part of the document, and a means for detecting the resonant circuit is provided when the document approaches a certain area of the copying or reading device. It attempts to stop some or all of the device's copying and reading operations.

However, although conventional sheet-shaped circuits have been put into practical use or have been proposed in which the conductor portion is printed with metal foil such as aluminum foil or conductive ink, these sheet-shaped resonant circuits cannot be peeled off or removed by bending or the like. It is difficult and rare to apply it to the above-mentioned information protection systems because it easily breaks, has reliability problems, and is not very paper-like.

On the other hand, the development of electronic equipment has required diversification of circuit forms, and research has been conducted on circuit materials depending on the purpose. Among them, a circuit material made by masking a polyacetylene film with a wettable film material to form a circuit pattern and exposing it to a dopant was proposed.
-88205).

Although this circuit material is paper-like, when manufacturing it, it is important to prevent the dopant from diffusing beneath the polyacetylene film coating, which would destroy the circuit. It's difficult to do.

[Objective] The present invention provides a resonant circuit which does not have the above-mentioned problems, is thinner, paper-like, easy to manufacture, and highly reliable.

The present invention also provides a method of using this resonant circuit to prevent copying and reading of documents, or to prevent theft of articles.

[Configuration 1 The present inventor has been conducting research on more paper-like circuits that do not have the above-mentioned drawbacks. The inventors have discovered that this problem can be solved by doing the following, and have completed the present invention.

That is, the present invention provides a sheet-like test circuit that resonates with electromagnetic waves of a specific frequency, in which the resonant circuit is formed on an insulating thin film,
A resonant circuit is characterized in that it is formed by forming a thin layer circuit pattern of a polymer material which itself is conductive. A sheet-like resonant circuit formed by forming a thin layer circuit pattern of a material is present in at least a part of the document to prevent copying and reading of information recorded on the document. A method of using a circuit, and a third invention is a method of using a circuit, and a third invention is a method of using a circuit, and a third invention is a method of using a circuit, and a third invention includes a resonant circuit in the form of a sheet 1, which is formed by forming a thin layer circuit pattern of a polymeric material, which itself is conductive, on an insulating thin film. This is a method of using the resonant circuit characterized in that the resonant circuit is present in a part of the resonant circuit to prevent theft of articles.

To explain the resonant circuit in more detail based on the drawings, the resonant circuit has a structure in which conductor parts as shown in FIGS. 1 and 2 are formed on both sides of the resonant circuit with a thin insulating layer in between. ing.

In the figure, 44.47 and 46.49 are portions forming capacitors, and 45.48 are portions forming an inductor. The constants of the 10 circuits formed by these are set by C and the circuit resistance depending on the pattern, and it is possible to control the resonance frequency thereby.

The conductor section itself is made of a conductive polymer material, and is an electronically conductive polymer material having an electrical conductivity of 10"S/cm2 or more.

Examples of such polymer materials include polyazulene, polyparaphenylene, polypyrrole, polythiophene, and poly-
Examples include 3-methylthiophene, polyphenylene vinylene, and polyaniline.

Conductor parts made of these conductive polymers can be produced by electrolytic polymerization on photoetched electrodes, or by printing a polymerization catalyst on an insulating layer and bringing it into contact with monomers under polymerization conditions. It can be formed by Generally speaking, regarding the former method, J, E lectr
ochem, Soc, .

Vol, 130. No. 7.1506-1509
(1983), E Iectoclem.

Acta,, Vol. 27. No, 1.6l-65(1
982), J. Chem.

Soc, , Chem, Commun, , 11
99-(1984), etc., a monomer and an electrolyte dissolved in a solvent are placed in a designated electrolytic bath, the electrodes are immersed, and an electrolytic polymerization reaction is caused by anodic oxidation. It can be done by

Electrolyte salts include L1PF6, Li5bFs, LiASFb, LiCIO4, NaCl
O4, Kl, KPF6, KSbFr,, KASF6
, KCIQ4, AQBF4, NaBF4, NaASFs
, NaPF6, [(n-BU) 4 N]”
・ ASF' −, [(n-Bu)4 N] ” ・
CI 04″″, LiAlCl4, or FeCIx
, AlCl3, AnC12, AIBrx, BF3, and other catalysts used in free sol fluorine reactions. Here, Bu represents a butyl group.

Examples of the solvent include acetonitrile, benzonitrile, propylene carbonate, γ-butyrolactone, dichloromethane, dioxane, dimethylformamide, and nitro solvents such as nitromethane, nitroethane, nitropropane, and nitrobenzene.

In addition to such starting materials (monomers), electrolyte components, and solvents, pyridine, 2,4.6-collidine, 2
, 6-lutidine and the like can also improve film formability.

As a material constituting the electrode during electrolytic polymerization, for example, Au
Examples include metals such as 5Pt1Ni, metal oxides such as SnO2 and In2O3, composite electrodes or coated electrodes thereof. In particular, it is preferable to use a metal oxide as the anode because a polymer film with high strength can be obtained.

For electrolytic polymerization, any of constant voltage electrolysis, constant current electrolysis, and constant potential electrolysis are possible, but constant current electrolysis and constant potential electrolysis are suitable, and constant current electrolysis is particularly preferred from the viewpoint of mass production.

Further, the above-mentioned insulating layer (which serves as the dielectric of the capacitor) constitutes the base of the sheet-like resonant circuit of the present invention.

Such insulating layers are made of polyethylene, polyester, polypropylene, or special paper impregnated with resin.
Ordinarily, a laminate is used in which a thermoplastic resin such as polyvinyl chloride, polyvinyl acetate, polychlorinated colidine, polyvinylidene butrate, polyacrylonitrile, or unsaturated polyester is laminated on these substrates.

The resonant circuit of the present invention is thinner than conventional ones,
It's more paper-like. Therefore, the present invention (
The membrane circuit does not feel strange even when pasted on documents, and it does not peel off or
Since there is no fear of wire breakage, etc., it is suitable for preventing copying and reading of information in documents. Furthermore, a resonant circuit can be formed on this thin insulating layer as a recording medium.

It can also be used to attach this to items to prevent them from being stolen.

In other words, when attempting to illegally remove an item with a resonant circuit from the store, a control area is set up in the store using electromagnetic waves emitted from a transmitting antenna, and the item is ensured to pass through this area. If the item is placed in this area, the receiving device will detect that the item is present in this area, and it will be known that the item has been illegally removed.

For example, as shown in Fig. 3, a control region is established by transmitting a signal whose frequency varies within a range of ±5 to 15% with 8MH7 as the center, and within this region there is a resonance signal with a resonance frequency of 8MH2. If the circuit exists, the electromagnetic waves received by the receiving antenna will be attenuated near 8MH2 as shown in FIG.

In this case, the intervening insulating layers 44 and 47 in FIGS. 1 and 2 are broken to establish electrical continuity.

Next, the resonant circuit of the present invention will be briefly and concretely explained with reference to examples.

Example 1 A coating film of 5 μm thick vinylidene chloride/unsaturated polyester 1/1 was formed on both sides of a 20 μm polyester film, and 0 FeCIx was added in water/acetonitrile 1/1.
．． A 1M solution was applied to one side of the film.
The pattern shown in the figure is printed on the usage side, and the pattern shown in FIG. Thereafter, the film was exposed to pyrrole vapor to form an insoluble and infusible polypyrrole conductive film on the film.

Example 2 Nesa glass was photo-etched to form the pattern shown in FIGS. 1 and 2, and a polypyrrole-p-toluenesulfonic acid complex film was formed on this pattern by electrolytic polymerization. Next, this 20 μm thick polypyrrole circuit pattern was laminated with a polyethylene film interposed therebetween, and a sheet-like resonant circuit was created by heat fusing.

[Effects of the Invention] As is clear from the above description, the resonant circuit according to the present invention is more paper-like than the conventional one, blends well with documents, and is less susceptible to peeling of conductor parts due to bending, etc. It has remarkable effects such as no disconnection, high reliability, etc.

This circuit can also be used to prevent copying and reading of documents.
It is possible to more reliably prevent the theft of articles.

[Brief explanation of the drawing]

Figures 1 and 2 show patterns of conductor parts formed on both sides with an insulating layer in between, Figure 3 is an example of electromagnetic waves emitted from a transmitting antenna, and Figure 4 is an example of electromagnetic waves received by a receiving antenna. An example of electromagnetic waves.

Claims (3)

[Claims] (1) A sheet-shaped resonant circuit that resonates with electromagnetic waves of a specific frequency, characterized in that the resonant circuit is formed by forming a thin layer circuit pattern of a polymeric material that itself has conductivity on an insulating thin film. resonant circuit. (2) Recording on documents by making at least a part of the document have a sheet-like resonant circuit formed by forming a thin layer circuit pattern of a conductive polymer material on an insulating thin film. A method of using the resonant circuit, characterized in that it prevents copying and reading of stored information. (3) Preventing theft of goods by having a sheet-shaped resonant circuit formed by forming a thin layer circuit pattern of a polymeric material, which itself is conductive, on an insulating thin film in at least a part of the goods. A method of using the resonant circuit, characterized in that: