JP2001216494A - Non-contact card, authenticating method and producing method therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a non-contact card to be made peculiar and monopolized, an authenticating method and a producing method therefor. SOLUTION: A non-contact card 100 has a first base material layer 1, a first adhesive layer 2, an LC resonance circuit 7 composed of a conductor pattern 31a formed on one side of a film base material 3 and a conductor pattern 31b formed on the other side, a second adhesive layer 4, a second base material layer 5 and rewrite layer 6 from the bottom layer. Since optically read information printed on the rewrite layer 6 of the non-contact card 100 is peculiar information generated on the basis of the resonance frequency of the relevant card, even when this peculiar information is read, it is difficult to calculate the resonance frequency. Therefore, the security of the card itself can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a non-contact type card,
More particularly, the present invention relates to a non-contact type card having a built-in resonance circuit, an authentication method thereof, and a manufacturing method thereof.

[0002]

2. Description of the Related Art Conventionally, a security tag composed of an LC resonance circuit has been used to prevent shoplifting, for example, in order to prevent theft of goods, for example, individual goods displayed at stores or video tapes of rental video shops and the like. It is generally known as a sealing material for use.

[0003] This LC tag is usually a wireless recognition technology, that is, an RFID (Radio Frequency Identifica).
tion).

[0004] Unlike the non-contact type IC card, the security tag including the LC resonance circuit described above is different from the IC tag of the non-contact type IC card.
It has a very simple configuration with only a coil (L) and a capacitor (C) without mounting a chip, and is formed using, for example, an aluminum foil and an insulating film. The feature of this security tag is that power supply is unnecessary, and it is inexpensive and has a long life, so that the demand for the security system is rapidly increasing.

[0005] An outline of a security system using a security tag (hereinafter, referred to as "LC tag") comprising such an LC resonance circuit will be described.

When a seal member having a built-in LC tag composed of a coil (L) and a capacitor (C) is attached to a product or the like and used, for example, a loop-type transmitting antenna, a transmitter and a loop are provided near the entrance of each store. Install the receiving antenna and receiver.

[0007] The frequency transmitted from the loop-type transmitting antenna is searched for whether or not the resonance frequency provided in the LC tag exists in the displaced frequency band while changing the frequency in a timely manner.

When an LC tag exists between both antennas, the intensity of the radio wave received by the receiving antenna changes near the resonance frequency of the LC tag. By reading this change, the LC tag between the antennas can be read. It recognizes its existence.

[0009]

However, in the security system as described above, an LC tag having a resonance frequency that simply resonates with a frequency output from a transmission antenna in the security system described above. However, the security in the usage method of identifying and authenticating the card itself has not been particularly regarded as a problem.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and provides a non-contact type card capable of making a non-contact type card unique and exclusive, an authentication method thereof, and a manufacturing method thereof. With the goal.

[0011]

According to an aspect of the present invention, there is provided a non-contact card having a resonance circuit, wherein the non-contact card has at least one card surface. A reversible recording layer is provided, and the unique information generated by using the resonance frequency of the resonance circuit is formed on the reversible recording layer as optically read information.

According to a second aspect of the present invention, in the first aspect of the present invention, the unique information uses a resonance frequency different for each band as a key of the encrypted information.

[0013] The invention according to claim 3 is the invention according to claim 1 or 2.
In the described invention, the non-contact type card has a protective layer for protecting the reversible recording layer.

According to a fourth aspect of the present invention, a reversible recording layer is provided on at least one card surface, and the unique information generated using the resonance frequency of the resonance circuit is formed on the reversible recording layer as optically readable information. A recognition step of reading optical information and recognizing unique information, a detection step of detecting a resonance frequency of a resonance circuit, and a detection step of the unique information recognized by the recognition step. And an authentication step of authenticating whether or not the information is generated using the resonance frequency detected by the method.

According to a fifth aspect of the present invention, in the fourth aspect of the present invention, the unique information uses a different resonance frequency for each band using the encrypted information as a key.

According to a sixth aspect of the present invention, there is provided a method for manufacturing a non-contact type card comprising a plurality of non-contact type cards provided with a resonance circuit which resonates at a predetermined frequency in a different band. A pattern forming step of simultaneously forming a desired pattern of conductivity according to the number of multi-faces, and a first adhesive layer on one surface of the insulating film on which the desired pattern is formed in the pattern forming step. A bonding step of laminating and bonding the second base material on the first base material and the other surface via a second bonding layer, and punching for punching the non-contact type card bonded in the bonding process into a predetermined shape. And a step.

[0017]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a contactless card according to an embodiment of the present invention; 1 to 10 show a contactless card, an authentication method thereof, and a manufacturing method thereof according to an embodiment of the present invention.

FIG. 1 is a sectional view showing a layer structure of a non-contact type card according to an embodiment of the present invention. In FIG. 1, a non-contact type card 100 according to an embodiment of the present invention is formed on one surface of a first base material layer 1, a first adhesive layer 2, and a film base material 3 from the bottom layer. It has a conductor pattern 31a, an LC resonance circuit 7 composed of a conductor pattern 31b formed on the other surface, a second adhesive layer 4, a second base material layer 5, and a rewrite layer 6. It is configured. The rewrite layer 6 is formed in advance on the upper surface of the second base layer 5.

The first base material layer 1 is a base material that forms the back surface of the non-contact type card 100 according to the embodiment of the present invention,
For example, PET (polyethylene terephthalate), PE
N (polyethylene naphthalate), PPS (polyphenyl sulfide), PEI (polyetherimide), P
I (polyimide), glass epoxy film, vinyl chloride, or the like is used.

The first adhesive layer 2 is formed between the LC resonance circuit 7 and the first
And a thermoplastic adhesive,
General adhesives such as a two-component curing adhesive and an instant adhesive can be used.

The LC resonance circuit 7 has conductor patterns 31 on both sides of an insulating film substrate 3 (polymer film).
The LC resonance circuit 7 includes the capacitors (C) and the coils (L) formed by forming the capacitors (a) and (31b). The resonance frequency of the LC resonance circuit 7 thus configured can be set to various values by changing the capacitance of the capacitor formed on the film substrate 3 and the inductance of the coil.

The second adhesive layer 4 is provided between the LC resonance circuit 7 and the second
And the same as the above-mentioned first adhesive layer 2 can be used.

The second base material layer 5 is a base material provided on the upper surface of the second adhesive layer 4, and is made of the same material as the first base material layer 1 described above. Second base material layer 5
The rewrite layer 6 is previously formed on the upper surface of the substrate.

The rewrite layer 6 is composed of, for example, a reversible thermosensitive recording layer which repeats color development / decoloration reversibly by heat and a protective layer for protecting the surface of the reversible thermosensitive recording layer.

As the reversible thermosensitive recording layer, leuco-based relite (composed mainly of a leuco dye, a color reducing agent and a binder resin) can be used. In the present embodiment, the rewrite layer 6 is provided with, for example, a reversible thermosensitive recording layer over the entire surface of the card. Is also possible.

The above-mentioned reversible thermosensitive recording layer (leuco rewrite) used for the rewrite layer 6 will be described below.

Leuco dyes are generally referred to as colorless or pale-colored electron-supplying dye precursors. Examples of the leuco dye include crystal violet lactone, 3-indolino-3-p-dimethylaminophenyl-6-dimethylaminophthalide, 3-diethylamino-7-chlorofluoran, and 2- (2-chlorophenylamine) -diethylamino. Fluoran, 2- (2-fluorophenylamino) -6-diethylaminofluoran, 2- (2-fluorophenylamino) -6-di-n-butylaminofluoran, 3-diethylamino-7-cyclohexylaminofluoran , 3-diethylamino-5-methyl-7
-Tert-butylfluoran, 3-diethylamino-6-methyl-7anilinofluoran, 3-diethylamino-6
-Methyl-7-p-butylanilinofluoran, 3-cyclohexylamino-6-chlorofluoran, 2-anilino-3-methyl-6- (N-ethyl-p-toluidino) -fluoran, 3-pyrrolidino- 6-methyl-7-
Anilinofluoran, 3-pyrrolidino-7-cyclohexylaminofluoran, 3-N-methylcyclohexylamino-6-methyl-7-anilinofluoran, 3-N
-Ethylpentylamino-6-methyl-7-anilinofluoran and the like.

The colorless or light-colored electron-donating dye precursors as leuco dyes may be used alone or in admixture of two or more.

The color-depressing agent is called an electron-accepting compound, and causes a reversible color tone change in the dye precursor due to a difference in cooling rate after heating. At least one aliphatic hydrocarbon group
A phenolic compound, a naphthol compound or a phthal compound, or an acidic compound having a phenolic hydroxyl group and an amino acid is used.

Examples of the color-reducing agent contained as a main component in the reversible thermosensitive recording layer include N- (p-hydroxyphenyl) -N'-n-octadecylthiourea and N- (p-hydroxyphenyl) -N '-N-octadecyl urea, N
-(P-hydroxyphenyl) -N'-n-octadecylthioamide, 4'-octadecaneanilide, 2-octadecylterephthalic acid, N-octadecyl (p-hydroxyphenyl) amide, N- (p-hydroxybenzoyl) -N- Octadecanoylamine, N- [3- (p-
Hydroxyphenyl) propiono] -N'-n-octadecanohydrazide, N-[(p-hydroxyphenyl)
Methyl] -n-octadecylamide, N-[(p-hydroxyphenyl) methyl] -n-octadecyl urea, N
-[(P-hydroxyphenyl) methyl] -N'-n-
Octadecyl oxamide and the like can be mentioned.

Here, the color-reducing agent may be one or two types.
A mixture of more than one species may be used.

Examples of the binder resin contained in the reversible thermosensitive recording layer include starches, hydroxyethyl cellulose, methyl cellulose, carboxymethyl cellulose, gelatin, casein, polyvinyl alcohol, modified polyvinyl alcohol, sodium polyacrylate, acrylamide / acrylic acid. Acid ester copolymer, acrylic acid amide / acrylic ester / methacrylic acid terpolymer, styrene / maleic anhydride copolymer alkali salt,
Water-soluble polymer such as alkali salt of ethylene / maleic anhydride copolymer, polyvinyl acetate, polyurethane, polyacrylate, styrene / butadiene copolymer, acrylonitrile / butadiene copolymer, methyl acrylate / butadiene Copolymers, latexes such as ethylene / vinyl acetate copolymers, and the like. In particular, they have excellent dispersibility of electron-donating dye precursors (leuco dyes) and electron-accepting compounds (color-reducing agents), and have excellent rewriting durability. An excellent reversible thermosensitive recording material layer can be obtained, and a vinyl chloride / vinyl acetate / vinyl alcohol copolymer can be used as a resin that is cured by ultraviolet or electron beam by introducing a double bond into the molecule of the thermoplastic resin. A resin obtained by subjecting acrylic acid or methacrylic acid to ester polymerization can be used. These resins alone,
Alternatively, two or more kinds can be used in combination.

Such a reversible thermosensitive recording layer (leuco relight) develops color by rapid cooling following heating.
When the cooling rate after heating is low, the color is erased. For example, heating for a relatively long time with an appropriate heat source heats not only the reversible thermosensitive recording layer but also its surroundings, so that the cooling rate is slow and the phase is separated (decolored). It has the property of being able to develop a colored state by being rapidly cooled after heating by a simple method, or by starting cooling (solidification) immediately after the heating is completed by heating for a very short time with a heat source. is there.

The rewrite layer 6 is not limited to the above-mentioned reversible thermosensitive recording layer (leuco-based rewrite).
Any rewritable device that can form an optically readable image, character, symbol, mark, or the like without hindering the resonance of the resonance circuit 7 can be used.

As such a rewritable device, a device utilizing iron powder type magnetic development (Nisshin Signal Co., Ltd .: VISM)
AC), those using magnetically responsive microcapsules (Star Seimitsu Co., Ltd .: I Messe), thermomagnetically responsive microcapsules (Toppan Printing Co., Ltd .: VIVA), organic low molecular / polymer composite films (no metal deposited film) And a liquid crystal / polymer composite film (PDLC film).

FIG. 2 is an example showing a schematic configuration of the LC resonance circuit 7 in the embodiment of the present invention. FIG. 2 (a)
Shows a conductor pattern 31a formed on the surface of the film substrate 3 of the LC resonance circuit 7, and FIG. 2B shows a plane showing the conductor pattern 31b formed on the back surface of the film substrate of the LC resonance circuit 7. FIG.

In FIG. 2A, a conductor pattern 31a formed on the surface of a film substrate 3 made of an insulating material is used.
Is a capacitor electrode formed using, for example, an aluminum foil or a conductive paste. In FIG. 2B, a conductor pattern 31b formed on the back surface of the film substrate
Are, for example, electrodes and a coil (L) of a capacitor (C) formed using an aluminum foil or a conductive paste.

In the present embodiment, the resonance frequency of the LC resonance circuit 7 composed of the capacitor (C) and the coil (L) formed on both sides of the film base 3 as described above mainly depends on the formation of the film base 3. And the number of turns of the coil (L).

Therefore, the conductor pattern is formed by changing the area of the capacitor (C) and the number of turns of the coil (L) for each card so as to resonate at a desired frequency. By changing the magnitude of the inductance (L), the LC resonance circuit 7 that resonates at a desired resonance frequency can be formed.

FIG. 3 is a flowchart schematically showing a method of manufacturing a non-contact type card by multiple mounting according to an embodiment of the present invention. In FIG. 3, a conductive paste was screen-printed on both sides of a film base 3 made of an insulating material to form conductor patterns 31a and 31b (step S1).

In step S1, the conductor pattern 31 forming the capacitor (C) and the coil (L)
When a and 31b are printed and formed, for example, as shown in FIG. 4, a conductor pattern 31a having a different shape is printed on one surface of the film substrate 3 at a time.

Next, on a top surface and a bottom surface of the film substrate 3 on which the conductor patterns 31a and 31b are formed, a precautionary note for use of a card, a logo mark, and the like are formed by UV offset printing via a heat-sensitive adhesive layer. A second base material layer in which information such as character information, a design, a company name and a serial number is formed on the first base material layer 1 (shown in FIG. 7) and the rewrite layer 6 by offset printing or the like. 5
(Shown in FIG. 6) are laminated (step S2).

A mirror plate made of stainless steel is disposed on the upper surface of the second base material layer 5 and the lower surface of the first base material layer 1 laminated in step 2, and is sandwiched from above and below and bonded by heating and pressing ( Step S3).

Next, the card was punched out by a punching machine to obtain a non-contact type card 100 having a different resonance frequency band by a predetermined number of impositions (step S4).

In the non-contact type card 100 manufactured by the above-described process, the capacitor (C) is printed by printing such that adjacent resonance frequencies (fc) have a constant difference (Δfc).
And the inductance of the coil (L) can be changed. At this time, for example, when the card is formed by eight impositions, the non-contact card 100 having eight kinds of resonance frequencies can be manufactured at a time.

FIGS. 4 and 5 are plan views showing the LC resonance circuit 7 (resonance circuit) when the non-contact type card according to the embodiment of the present invention is manufactured by multiple mounting. The hatched portions (hatched portions) in FIG. 4 and FIG.
This shows the conductor patterns 31a and 31b. For example, as shown in FIG. 4 and FIG. 5, in the present embodiment, it is manufactured by multi-face imposition of eight faces, but the number of face impositions is not particularly limited.

The method of forming the conductive patterns 31a and 31b is not limited to the method of forming the conductive paste by screen printing.
A conductor foil such as an aluminum foil or a copper foil may be laminated on both surfaces of the film substrate 3 and the conductor patterns 31a and 31b may be formed by using a known etching technique.

Next, a specific example of manufacturing a non-contact type card according to an embodiment of the present invention by multiple mounting will be described below.

As the film substrate 3, a 50 μm-thick polyethylene terephthalate film (Lumirror # 50S-56) manufactured by Toray Industries, Inc. was used, and a conductive ink (manufactured by Acheson Japan Ltd.) was applied to the surface of the film substrate 3. ELEC
TRODAG screen printing ink: PF-800)
From stainless steel # 20 on which a desired conductor pattern is formed.
OB, and printing was performed using a silk screen printing plate having an emulsion thickness of 20 μm. Next, the printed conductor pattern 31a was dried at 150 ° C. for 20 minutes to form a conductor pattern 31a shown in FIG. 4 having a dry thickness of about 20 μm. Next, the conductive pattern 31b shown in FIG. 5 was formed on the back surface using the above-described conductive ink under the same conditions as those on the front surface.

A rewrite layer 6 was formed on the second base material layer 5 as described below. First, as a second base material layer 5, a rewrite layer 6 with a protective layer was formed on a 125 μm-thick white polyethylene terephthalate film (Lumirror # 125E-28G) manufactured by Toray Industries, Inc.

[Rewrite layer] Formulation of reversible thermosensitive recording material-Leuco dye (manufactured by Yamamoto Kasei Co., Ltd., trade name: BLUE63) ... 20 parts by weight-Sensitive color reducing agent (N- [3- (4-hydroxyphenyl) ) Propiono] -N'-n-docosanohydrazide) ... 60 parts by weight-Acrylic resin (manufactured by Mitsubishi Rayon Co., Ltd., trade name: Dianal BR-80) ... 60 parts by weight-UV curable resin ( BASF, trade name LAROMER LR8864) 20 parts by weight Photopolymerization initiator (trade name Darocure 1173, Ciba Geigy) 1 part by weight Solvent (methyl ethyl ketone / toluene = 1/1) 1000 Parts by weight

The above-mentioned reversible thermosensitive recording material is put in a container, 2 mmφ zirconia beads are added, and the mixture is dispersed with a paint shaker for 3 hours, applied on the second base material layer 5 with a # 30 wire bar, and then at 80 ° C. for 5 minutes. After drying, a high-pressure mercury lamp of 160 W / cm was irradiated at a speed of 30 m / min to form a relite layer 6. At this time, the dry film thickness of the relite layer 6 is:
It was about 8 μm.

Next, a protective layer was formed on the rewrite layer.

[Protective layer] Compounding of material to be protective layer-UV curable paint (manufactured by Dainippon Ink & Chemicals, Inc., trade name Unidic 17-806, solid content 80%) ... 100 parts by weight-silica (Trade name: Sylysia 436, manufactured by Fuji Silysia Chemical Ltd.) 5 parts by weight Solvent (MEK: toluene 1: 1) 150 parts by weight

The above-mentioned materials were put in a container, 2 mmφ zirconia beads were added, and dispersed by a paint shaker for 10 minutes. Next, this was coated on the reversible thermosensitive recording layer with a # 4 wire bar, dried at 80 ° C. for 5 minutes, and then heated at 160 W / c.
m, 30 m / min, one pass of ultraviolet irradiation. Thus, a protective layer having a thickness of 2 μm was formed on the rewrite layer.

Next, desired character information and design are printed on the protective layer. In these printings, as shown in FIG. 6, for example, information such as a company name and a serial number such as “ABCD Card” or “AB” is formed by UV offset printing, and the rewrite layer 6 shown in FIG.
To obtain a second base material layer 5.

Next, on a 100 μm-thick white polyethylene terephthalate film manufactured by Toray Industries, Inc., a precautionary note for use of a card, a logo mark, and the like are formed by UV offset printing, and the first base material layer shown in FIG. 1 was obtained.

Next, 100 μm-thick sheet-like hot-melt adhesives 2 and 4 (Aronmelt PES-111) made by Toagosei Co., Ltd. are applied to the front and back surfaces of the film substrate 3 on which the conductor patterns 31a and 31b are formed. Thus, the first base material layer 1 and the second base material layer 5 on which the rewrite layer 6 was formed were laminated.

Next, a mirror plate made of stainless steel is arranged on the upper surface of the laminated second base material layer 5 and the lower surface of the first base material layer 1, and sandwiched from above and below at 125 ° C. and 10 kg / cm.
After heating and pressing for 10 minutes under the conditions of ² , 15 to 15
Cooled for 16 minutes and bonded.

Next, the card was punched into a card shape by a punching machine to obtain a non-contact type card 100 having a different resonance frequency band by a predetermined number of impositions.

In the present invention, as shown in FIG.
Is set so as to maximize the area of the conductive pattern formed thereon, and the conductive paste is screen-printed in the order of (b), (c),..., (H) so as to reduce the area of the conductive pattern. It is formed by this. As described above, by changing the area of the electrode of the capacitor (C) according to the maximum number of impositions, the capacitance of the capacitor (C) is changed, and the non-contact type having a certain difference in the resonance frequency (fc) is obtained. Mold cards can be manufactured.

In FIG. 5, the electrode area of the capacitor (C) formed in (a) to (h) and the number of turns of the coil (L) are the same, and as shown in FIG. By changing the electrode area of the capacitor (C), the capacitance of the electrode is changed, thereby setting a different resonance frequency for each non-contact type card.

4 and 5, the resonance frequency of the LC resonance circuit 7 is calculated by the following equation (1).

[0064]

(Equation 1)

As can be seen from equation (1), the resonance frequency (fc) is inversely proportional to the square root of the product of the capacitance of the capacitor (C) and the inductance of the coil (L).

FIG. 8 is a diagram showing the resonance frequency of each non-contact type card when manufactured by multiple mounting.
In FIG. 8, the resonance frequency a of the non-contact type card in which the capacitance of the capacitor (C) is set to the maximum is low, and the resonance frequencies b to g gradually increase as the capacitance of the capacitor (C) decreases. The resonance frequency h of the non-contact type card formed by setting the capacity of C) to the minimum is the highest.

Such a resonance frequency different for each non-contact type card varies, for example, in the reading accuracy of a reader / writer or the printing of a conductor pattern in the production of the non-contact type card. It is necessary to read at a possible frequency value, and by providing a predetermined threshold value T for the signal strength, it becomes possible to read the resonance frequency of each non-contact type card with high accuracy.

The reader / writer of the present invention incorporates different encryption information (unique information) as data in each predetermined frequency band (for example, as shown in FIG. 8, bands a to h). Therefore, the non-contact type card as described above uses, as a key, a frequency band to which a resonance frequency of the card belongs, and uses, as a key, encryption information (unique information) built in a reader / writer database, for example, FIG.
As shown in FIG. 3A, the optical barcode information (one-dimensional) is printed on the rewrite layer 6 by the thermal head.

FIG. 9A is a plan view showing the appearance of a non-contact type card on which an optical barcode is printed by the thermal head. In FIG. 9A, on a rewritable layer 6 formed on the surface of a non-contact type card, encrypted information read out by a reader / writer using the resonance frequency of the card as a key is printed as an optical barcode.

In addition to the information by the optical barcode described above, for example, the name and date information of an exhibition or an event hall can be displayed on the rewrite layer 6 by printing. By erasing the printed information, the non-contact card 100 can be reused.

The optical barcode information is not limited to one-dimensional, but may be two-dimensional. If it is optically readable information, the optical barcode information is not limited to barcodes, but may be OCR characters. But it is good.

FIG. 10 is a flowchart showing an authentication method for the non-contact type card 100 according to the embodiment of the present invention. In FIG. 10, bar code information formed on the rewrite layer surface of the non-contact type card 100 according to the embodiment of the present invention is read (step S11). Next, the card 10
It detects which of the frequency bands a to h shown in FIG. 8 the resonance frequency of the LC resonance circuit 7 provided in 0 is (step S12).

It is determined whether the barcode information read in step S11 is unique information generated based on the resonance frequency of any of the frequency bands a to h detected in step S12 (step S13). ).

The above-described embodiment is a preferred embodiment of the present invention, and various modifications can be made without departing from the spirit of the present invention.

[0075]

As is apparent from the above description, according to the present invention, the optically readable information printed on the rewrite portion of the non-contact type card is unique in that it is generated based on the resonance frequency of the card. Because the information is information, it is difficult to determine the resonance frequency even if the unique information is read. Therefore, the security of the contactless card itself can be improved.

Further, according to the present invention, since it is configured to have a reversible recording layer, once printed information is erased,
New information can be printed again. Therefore, the non-contact type card can be reused.

Further, according to the present invention, by forming the inductance of the coil (L) and the capacitance of the capacitor (C) by printing at different sizes during screen printing, a plurality of types of LCs that resonate at different frequencies are formed. A non-contact type card having a built-in resonance circuit can be manufactured.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a schematic configuration of a non-contact type card according to an embodiment of the present invention.

FIG. 2 is a plan view illustrating a schematic configuration of an LC resonance circuit according to an embodiment of the present invention.

FIG. 3 is a flowchart showing a non-contact type card manufacturing process according to an embodiment of the present invention.

FIG. 4 is a plan view showing a surface of an LC resonance circuit in a manufacturing process of the present invention.

FIG. 5 is a plan view showing the back surface of the LC resonance circuit in the manufacturing process of the present invention.

FIG. 6 is a plan view showing the surface of the non-contact type card in the manufacturing process of the present invention.

FIG. 7 is a plan view showing the back surface of the non-contact type card in the manufacturing process of the present invention.

FIG. 8 is a diagram showing the resonance frequencies of individual cards when the non-contact type card of the present invention is manufactured by multiple mounting.

FIG. 9 is a plan view showing the appearance of a non-contact card manufactured by the manufacturing method according to the embodiment of the present invention.

FIG. 10 is a flowchart illustrating an authentication process of a non-contact type card according to an embodiment of the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 first substrate 2 first adhesive layer 3 film substrate 4 second adhesive layer 5 second substrate 6 rewrite layer 7 LC resonance circuit 31a conductor pattern (front surface) 31b conductor pattern (back surface) 100 non-contact Type card

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) G06K 7/10 G06K 17/00 F 17/00 T 19/00 R 19/07 H 19/077 K 19 / 08 F (72) Inventor Shinichi Suzuki 1-13-8 Kamikizaki, Urawa-shi, Saitama Japan Signal Corporation Yono Works (72) Inventor Jou Inoue 1-13-8 Kamikizaki, Urawa-shi, Saitama Japan Signal F-term in Yono Plant Co., Ltd. (reference) CC24 DD01

Claims (6)

[Claims] 1. A non-contact card having a resonance circuit, wherein the non-contact card has a reversible recording layer on at least one card surface, and is generated using a resonance frequency of the resonance circuit. A non-contact card, wherein unique information is formed on the reversible recording layer as optically readable information. 2. The contactless card according to claim 1, wherein the unique information uses a resonance frequency different for each band as a key of the encryption information. 3. The non-contact type card according to claim 1, wherein the non-contact type card has a protective layer for protecting the reversible recording layer. 4. A non-contact type wherein a reversible recording layer is provided on at least one card surface, and unique information generated using a resonance frequency of the resonance circuit is formed on the reversible recording layer as optically read information. A method for authenticating a type card, comprising: a recognition step of reading the optical information and recognizing unique information; a detection step of detecting a resonance frequency of the resonance circuit; and the detection of the unique information recognized in the recognition step. An authentication step of authenticating whether or not the information is generated using the resonance frequency detected in the step. 5. The non-contact card authentication method according to claim 4, wherein the unique information uses a resonance frequency different for each band as encryption information as a key. 6. A non-contact card manufacturing method for manufacturing a non-contact card provided with a resonance circuit that resonates at a predetermined frequency having a different band by multiple mounting, the method comprising: A pattern forming step of simultaneously forming a desired conductive pattern in accordance with the first pattern; and a first base via a first adhesive layer on one surface of the insulating film on which the desired pattern is formed in the pattern forming step. A bonding step of laminating and bonding a second base material to the material and the other surface via a second bonding layer, and a punching step of punching the non-contact type card bonded in the bonding step into a predetermined shape A method for manufacturing a non-contact type card, comprising: