JP2005234830A - Contactless communication medium and manufacturing method for it - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a contactless communication medium and a manufacturing method for it capable of forming a print layer in metallic color on an armor sheet surface while reducing fluctuation in a resonance frequency due to static electricity and the like. <P>SOLUTION: In a contactless IC card, in which an antenna module 4 having an antenna coil and an IC chip 1 electrically connected to the antenna coil is put between a plurality of sheet materials including a pair of armor sheets 5, the print layer 8 formed on the surface of the armor sheet 5 is formed by using paint containing 1.3 g/m2 or less of aluminum powder. In this way, fluctuation in the resonance frequency due to static electricity and the like can be reduced even though the print layer in metallic color is formed on the armor sheet surface, and a communication characteristic can be stabilized. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a non-contact communication medium using an RFID (Radio Frequency Identification) system such as a non-contact IC card or a non-contact IC tag (electronic tag), and a manufacturing method thereof, and more particularly, a paint containing a metallic powder. The present invention relates to a non-contact communication medium in which a printed layer is formed on the surface of an exterior sheet and a manufacturing method thereof.

  Conventionally, RFID systems that exchange information without contact have been used in a wide range of fields such as transportation ticket gate systems, highway automatic toll collection systems, public telephone prepaid card systems, and factory product management systems. Yes.

  Such an RFID system has the convenience that information can be read and written only by placing a non-contact communication medium such as a non-contact IC card or a non-contact IC tag over a reader / writer. This type of non-contact communication medium has a structure in which an antenna module made up of an IC chip, antenna coil, capacitor, and the like on which predetermined information is recorded is sandwiched between a plurality of sheet materials including a pair of front and back exterior sheets.

  Now, with the spread of this type of non-contact communication medium in recent years, the design of the exterior of the non-contact communication medium has become important. Conventionally, primary color paints containing organic or inorganic pigments such as red and yellow are mainly used, but in recent years, metallic paints containing metal powder pigments are formed on the surface of exterior sheets, There is a demand for a metallic luster on the exterior of a contact communication medium. In addition, since the metallic color such as silver has little light transmission, it can be used to conceal the magnetic stripe transferred to the card surface.

  Prior art documents related to the invention of this application are shown below. Patent Document 1 below discloses a configuration of a metal powder pigment of a paint for applying a metallic color to the exterior of an automobile body or household appliance.

JP-A-62-81460

  However, when a non-contact communication medium is manufactured using an exterior sheet in which a printed layer is formed with a paint using a metal powder as a pigment, the resonance frequency decreases in a strong electric field atmosphere caused by static electricity or the like. There is a problem of adversely affecting communication characteristics. The influence of static electricity is easily caused by the charge that charges the exterior surface when the non-contact communication medium is taken out from clothes, pockets, bags or the like.

  In addition, although the fluctuation factor of the resonance frequency has not yet been elucidated, the printed circuit layer is formed with a paint containing metal powder, resulting in fluctuations in the capacitance or inductance of the resonance circuit configured on the antenna module. It is assumed that the resonance frequency fluctuates due to this.

  Therefore, when a metallic color is printed on the exterior surface of a non-contact communication medium, it is necessary to take some measures against fluctuations in resonance frequency so as not to adversely affect communication characteristics such as communication distance. .

  The present invention has been made in view of the above problems, and provides a non-contact communication medium that can suppress fluctuations in resonance frequency caused by static electricity or the like while having a metallic color printed layer on the exterior sheet surface. And

  Another object of the present invention is to provide a method for manufacturing a non-contact communication medium capable of forming a metallic color printed layer on the exterior sheet surface while suppressing fluctuations in resonance frequency caused by static electricity or the like. .

In solving the above problems, the non-contact communication medium of the present invention includes an antenna module including an antenna coil and an IC chip electrically connected to the antenna coil sandwiched between a plurality of sheet materials including a pair of exterior sheets. In the non-contact communication medium in which a printing layer is provided on at least one surface of the pair of exterior sheets, the printing layer is formed of a paint using aluminum powder as a pigment, and the content of the aluminum powder is 1. 3 g / m ² or less.

The non-contact communication medium manufacturing method of the present invention includes a step of sandwiching an antenna module including an antenna coil and an IC chip electrically connected thereto with a plurality of sheet materials including a pair of exterior sheets, Forming a printing layer on at least one side surface of the pair of exterior sheets, and using the paint containing aluminum powder as a pigment for forming the printing layer, the content of the aluminum powder is 1.3 g / m ² or less.

In the present invention, a printed layer is formed using a paint containing aluminum powder having a content of 1.3 g / m ² or less as a pigment, thereby suppressing fluctuations in the antenna resonance frequency caused by static electricity or the like. .

According to the non-contact communication medium of the present invention, since the paint using aluminum powder with a content of 1.3 g / m ² or less as a pigment is used for printing applied to the exterior of the non-contact communication medium, It is possible to stabilize the communication characteristics such as the communication distance by suppressing the fluctuation of the resonance frequency.

In addition, according to the method for producing a non-contact communication medium of the present invention, the printed layer is formed on the exterior of the non-contact communication medium using a paint containing aluminum powder having a content of 1.3 g / m ² or less as a pigment. Therefore, it is possible to manufacture a non-contact communication medium in which fluctuations in resonance frequency caused by static electricity or the like can be suppressed, and communication characteristics such as communication distance can be stabilized.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following embodiments, an example in which a non-contact IC card is applied as the non-contact communication medium of the present invention will be described.

  1 and 2 show a configuration of a non-contact IC card 10 according to an embodiment of the present invention. The non-contact IC card 10 includes an antenna module 4 formed by forming an IC chip 1 on which predetermined information is recorded, an antenna coil 2, a capacitor, and the like on a base film 3 with a plurality of sheet materials including a pair of exterior sheets 5. It has a sandwiched structure.

  The sandwiching of the antenna module 4 between the pair of exterior sheets 5 is applicable to a configuration in which the exterior sheet 5 is bonded with an adhesive layer made of a thermosetting resin such as an epoxy resin. In the present embodiment, FIG. As described above, the core sheet 6 is interposed between the antenna module 4 and the exterior sheet 5, and the layers are thermally fused by a hot press method to form a card.

  The IC chip 1 constituting the antenna module 4 employs a structure sandwiched between a pair of metal plates 7 via a sealing resin such as epoxy, thereby improving the strength of the IC mounting portion. Moreover, as a constituent material of the exterior sheet 5 and the core sheet 6, known thermoplastic or thermosetting resins such as PET, PVC, PC, ABS, PP, PE, PETG, polyamide, PEN, and epoxy can be used. . Moreover, although the magnetic stripe (not shown) is transcribe | transferred by the surface side or the back surface side of the exterior sheet 5, you may abbreviate | omit as needed.

  A printing layer 8 is provided on the surface of the exterior sheet 5. The print layer 8 is formed of a metallic paint using aluminum powder as a pigment. In addition, although the printing layer 8 is formed in each surface of a pair of exterior sheet 5, you may be provided only in any one exterior sheet.

  The shape of the aluminum powder constituting the metal powder pigment of the printed layer 8 is mainly a scaly shape, but is not limited to this, and spherical, needle-like, and fiber-like metal powders are also applicable.

  In the present embodiment, by forming the printing layer 8 with a paint using scaly aluminum powder as a pigment, a silver-based metallic color is applied to the card surface, and at the same time, a concealing function for the magnetic stripe on the lower layer side is provided. Like that.

Here, in the present invention, the printing layer 8 is formed by using a paint containing aluminum powder having a content of 1.3 g / m ² or less as a pigment.

The lower limit of the content of aluminum powder and 0.05 g / m ^2, therefore, to 0.05 g / m ² or more 1.3 g / m ² or less in the range defines the content of the aluminum powder.

  For example, the paint having an aluminum powder pigment content of 1.27417 g / m 2 is 36 g of aluminum paste, 100 g of urethane resin as a binder, 3 g of isocyanate curing agent (TDI), 150 g of methyl ethyl ketone (MEK), and toluene. It can be formed by mixing 150 g and dispersing aluminum paste in urethane resin. As a method for forming the printing layer 8 using this paint, a 3.3 μm film thickness is applied on the exterior sheet (PET) 5 by wire bar coating. To do. As the above aluminum paste, for example, “Regular Aluminum Paste” manufactured by Showa Aluminum Powder Co., Ltd. is applicable.

  Experiments were conducted to confirm the effect of the present invention.

  The contactless IC card 10 having the configuration shown in FIG. 2 is actually manufactured, and the printed layer 8 is formed on the surface of the exterior sheet 5 using a paint containing an aluminum powder pigment, and the resonance frequency in a strong electric field atmosphere is increased. The amount of change (Δf0 [MHz]), determination based on this, and evaluation of concealment were performed.

The structure of the produced non-contact IC card 10 is shown below.
Exterior sheet 5: Biaxially stretched milk white PET (with easy adhesion), 125 μm
・ Print layer 8: Silver layer directly applied (applied to a pair of front and back exterior sheets under the same conditions)
Core sheet 6: PETG, each layer thickness 225 μm
Antenna module 4: An IC chip mounted on a parallel resonant circuit having an antenna coil and a capacitor, and trimmed to obtain a desired resonant frequency. All samples are trimmed for the same resonance frequency.

  The coating material constituting the printing layer 8 was prepared by mixing and dispersing in urethane resin together with isocyanate curing agent (TDI), methyl ethyl ketone (MEK) and toluene with different contents of aluminum powder pigment. For forming the printed layer 8, the prepared paint was applied on the exterior sheet with a coating thickness of 3.3 μm by wire bar coating.

  The results of the experiment are shown in Table 1.

  The measurement of the resonance frequency change Δf0 was performed in a state where a strong electric field was applied to the non-contact IC card 10. For applying a strong electric field, an ESD tester (ESS-200AX) manufactured by Noise Giken was used, and a voltage of −10 kV (100 pF, 500Ω) was applied to predetermined 12 points on the surface of the printing layer 8. The resonance frequency was measured using the “Agilent NETWORK ANALYSER E5100A”.

  Judgment of the measured resonance frequency change Δf0 is evaluated when the resonance frequency fluctuation is within ± 0.02 MHz (within the measurement error range), and when the resonance frequency fluctuation is within ± 0.10 MHz (within the actual use range). The case where is other than ○ is Δ, and the change in resonance frequency is more than ± 0.10 MHz ×. As for the hiding property evaluation, the hiding property of the magnetic stripe on the lower surface of the printing layer 8 was evaluated as a double circle in which the hiding property was very high and almost no light was transmitted. Some (the magnetic stripe can be seen through a little) were marked with ◯, and those that were not concealed but allowed to transmit light within the usable range were marked with Δ.

As is clear from Table 1, when the content of the aluminum powder exceeds 1.3 g / m ² , a good concealing property is recognized, but a fluctuation in resonance frequency of 1 MHz or more is recognized. FIG. 3 shows the relationship between the content (coating amount) of the aluminum powder and the amount of change Δf0 in the resonance frequency. When the aluminum powder content exceeds 1.3 g / m ² , Δf 0 increases almost linearly.

In addition, although not shown in the table, when the content of the aluminum powder is less than 0.05 g / m ² , the concealability is greatly impaired, and light transmission is recognized beyond the usable range. .

Therefore, by the print layer 8 is formed by using the content of the aluminum powder was adjusted to 0.05 g / m ² or more 1.3 g / m ² or less in the range paints, while ensuring the magnetic stripe hiding function, It becomes possible to suppress fluctuations in the resonance frequency in an electric field atmosphere, thereby stabilizing the communication characteristics of a non-contact communication medium such as the non-contact IC card 10 and contributing to improving reliability. It becomes possible.

  The embodiment of the present invention has been described above. Of course, the present invention is not limited to this, and various modifications can be made based on the technical idea of the present invention.

  For example, in the above embodiment, a non-contact IC card has been described as an example of a non-contact communication medium. However, the present invention is not limited to this, and the present invention is also applicable to, for example, a non-contact IC tag having a similar antenna module built therein. The invention is applicable.

1 is a schematic configuration diagram of a non-contact IC card 10 according to an embodiment of the present invention. 2 is a side sectional view of the non-contact IC card 10. FIG. It is a figure which shows the relationship between the application quantity of aluminum powder, and the variation | change_quantity (DELTA) f0 of resonance frequency.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... IC chip, 2 ... Antenna coil, 3 ... Base film, 4 ... Antenna module, 5 ... Exterior sheet, 6 ... Core sheet, 8 ... Printing layer, 10 ... Non-contact IC card.

Claims (4)

An antenna module including an antenna coil and an IC chip electrically connected thereto is sandwiched between a plurality of sheet materials including a pair of exterior sheets, and a printed layer is provided on at least one surface of the pair of exterior sheets. In a contactless communication medium,
The printed layer is formed of a paint using aluminum powder as a pigment,
Content of the said aluminum powder is 1.3 g / m < ² > or less. The non-contact communication medium characterized by the above-mentioned. The non-contact communication medium according to claim 1, wherein the content of the aluminum powder is 0.05 g / m ² or more. Sandwiching an antenna module including an antenna coil and an IC chip electrically connected thereto with a plurality of sheet materials including a pair of exterior sheets;
Forming a printed layer on at least one side surface of the pair of exterior sheets,
A method for producing a non-contact communication medium, wherein a paint using aluminum powder as a pigment is used for forming the printed layer, and the content of the aluminum powder is 1.3 g / m ² or less. The method for producing a non-contact communication medium according to claim 3, wherein the content of the aluminum powder is 0.05 g / m ² or more.

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