JP4713126B2 - Non-contact IC card - Google Patents

Description

  The present invention relates to a non-contact IC card, and in particular, a magnetic recording unit is provided on at least one surface of a card base, and an IC module and a communication antenna are built in the card base, so that data is contactless. It is related with the non-contact IC card which can transmit / receive.

  With the development of card technology in recent years, there is an IC card applicable to a wide range of uses as an information recording medium used in various communication systems. In this IC card, a contact type IC card capable of writing and reading information by bringing it into contact with a dedicated device, and a writing and reading process of information only by bringing it close to the dedicated device. There are non-contact type IC cards that can be used.

  These IC cards have higher security compared to magnetic cards, and the amount of information that can be written on the cards themselves is large, so that they can be used in a multifaceted manner with only one card. It continues to increase.

  In particular, a non-contact type IC card does not require the IC card itself to be inserted into a dedicated device when performing an information writing process or reading process, and the card itself may be conveniently handled. It is rapidly spreading on the industry.

  In addition, there is an IC card provided with a magnetic recording unit such as a magnetic stripe, and a communication system using a conventional magnetic recording unit and a communication system using an IC chip can be used with only one card. Build a possible structure.

  Note that the non-contact type IC card has different communication characteristics depending on the reception efficiency of the communication antenna built in the card base. By increasing the reception efficiency of the communication antenna, the electromagnetic wave transmitted from the reader / writer can be efficiently transmitted. It becomes possible to receive well, and the communication range is expanded.

  For this reason, reducing the electrical resistance of the antenna coil is cited as one of means for extending the communication distance with the reader / writer. Since the electric resistance of the antenna coil is inversely proportional to the cross-sectional area of the antenna coil, it is preferable that the antenna coil arranged in the non-contact type IC card has a thick antenna coil and a thick antenna coil. .

  In addition, when the antenna coil on the card side is smaller than the antenna coil on the reader / writer side, more energy is obtained as the area of the antenna coil is larger. For this reason, when extending the communication distance or increasing the power consumption of the IC chip, it is necessary to increase the shape of the antenna coil.

  In an IC card provided with a magnetic recording unit, if the area of the antenna coil that overlaps the magnetic recording unit changes, the resonance frequency changes, resulting in different communication characteristics for each card, and uniform communication characteristics. There is a problem that it is difficult to form an IC card having

  For this reason, in an IC card provided with a magnetic recording unit, uniform communication characteristics can be obtained by arranging the antenna coil so that the magnetic recording unit and the antenna coil for non-contact communication do not overlap. An IC card can be formed.

  However, in order to prevent the magnetic recording unit and the antenna coil from overlapping each other, the space in which the antenna coil can be placed on the card is limited, and communication with a reader / writer required for a non-contact IC card is required. It becomes difficult to secure the distance.

  In addition, the position where the magnetic recording portion made of a magnetic stripe is provided is defined by the standard according to the use of the card. For example, in the JIS X6302 regulations for credit cards, the distance from the upper end of the card to the front side of the magnetic recording portion is The maximum distance is set to 5.54 mm, and the distance from the upper end of the card to the back side of the magnetic recording unit is defined to be a minimum of 11.89 mm.

  Therefore, in order to improve the communication characteristics of the IC card, it is inevitable that the magnetic recording unit and the antenna coil overlap.

For this reason, as a technical document filed prior to the present invention, a card substrate including a circuit including an antenna circuit, an electronic component such as an IC chip connected to the card substrate, a skin layer, and a skin layer There is an IC card that is composed of provided magnetic stripes, and the antenna circuit intersects with the magnetic stripes so that the sensitivity of the antenna circuit is hardly lowered and a card function can be added (for example, see Patent Document 1).
JP 2001-5929 A

  However, the IC card of the above-mentioned patent document 1 suppresses a decrease in sensitivity of the antenna circuit by allowing the antenna circuit to cross the magnetic stripe, and allows addition of a card function. The electrical phenomenon caused by the relationship is not considered at all.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a non-contact IC card having good communication characteristics and uniform communication characteristics in a non-contact IC card having a magnetic recording unit. It is what.

  In order to achieve this object, the present invention has the following features.

The non-contact IC card according to the present invention is
A card substrate, a coiled antenna wound in a plurality of turns embedded in the card substrate, an IC chip connected to the antenna embedded in the card substrate, and the card And a magnetic recording portion provided at a predetermined position on the surface of the substrate,
The width per one antenna is narrower than the width of the magnetic recording unit, and the width from the innermost antenna to the outermost antenna in the longitudinal direction of the magnetic recording unit is the same as that of the magnetic recording unit. are arranged so as overlapping, and characterized by comprising disposed such that at least the innermost antenna and outermost antenna is extrinsic to both the width direction of the magnetic recording portion.

According to the present invention, even if the antenna is not disposed at a predetermined position, the area where the magnetic recording unit and the antenna overlap is made uniform by the antenna external to both of the magnetic recording units. In addition, it is possible to have uniform communication characteristics.

  First, the characteristics of the non-contact IC card in the present embodiment will be described with reference to FIGS.

  As shown in FIG. 1, the non-contact IC card in this embodiment includes a card base (1), an antenna (2) embedded in the card base (1), and a card base (1). An IC chip (3) connected to the antenna (2) embedded in the card, and a magnetic recording part (13) provided at a predetermined position of the card base (1). 2), as shown in FIG. 2, in the longitudinal direction of the magnetic recording portion (13), the antenna (21) is arranged in an external shape on both sides of the magnetic recording portion (13). Even if 21) is not arranged at a predetermined position, an area (overlapping area) in which the magnetic recording section (13) and the antenna (21) overlap with each other by the antenna (21) external to both of the magnetic recording sections (13) ( 23) is uniform, the communication characteristics are good and the communication characteristics are uniform. Bet in which it is possible.

  Hereinafter, the non-contact IC card in the present embodiment will be described with reference to the accompanying drawings.

  First, the configuration of the non-contact IC card in the present embodiment will be described with reference to FIG.

  As shown in FIG. 1, the non-contact IC card in the present embodiment is formed with an antenna pattern (2) such as a spiral antenna or a capacitor on an antenna substrate (1), and the formed antenna pattern (2). The IC chip (3) is mounted on the antenna substrate (1) so that the IC chip (3) and the IC chip (3) are electrically connected via the adhesive (4), and the inlet sheet (10) is formed. It will be. And by covering and laminating the inlet sheet (10) from the upper and lower surfaces of the inlet sheet (10) with the core sheet (11) as the laminate base material and the oversheet (12), A contact IC card is formed. Furthermore, a magnetic recording layer (13) is provided on the surface of the non-contact IC card according to the present invention.

  Next, each base material constituting the non-contact IC card shown in FIG. 1 will be described.

<Core sheet (11)>
The core sheet (11) is a card base material that is a central portion of the IC card main body, and is a base material that imparts strength to the card main body. As the resin applied to the core sheet (11), general polystyrene resin, impact polystyrene resin, acrylonitrile styrene resin, ABS (acrylonitrile-butadiene-styrene copolymer) resin, acrylic resin, polyethylene resin, polypropylene resin, Conventionally, thermoplastic resins such as polyamide resin, polyacetal resin, PC (polycarbonate) resin, vinyl chloride resin, modified PPO resin, polybutylene terephthalate resin, polyphenylene sulfide resin, reinforced resin by addition of glass fiber, etc. Well-known resin applicable to the card | curd base material used as the center part of an IC card main body is mentioned.

  In addition, since vinyl chloride, PET, PET-G, and the like have the property of self-bonding, an adhesive or an adhesive sheet is not required for lamination, so vinyl chloride, PET, PET-G, etc. Is preferably applied to the core sheet (11).

<Oversheet (12)>
The oversheet (12) is a card substrate that constitutes the IC card body and the outer portion. Examples of the resin applied to the oversheet (12) include resins applicable to the above-described core sheet (11).

<Antenna substrate (1)>
The antenna substrate (1) is an insulating base material that forms the antenna pattern (2). Examples of the resin applicable to the antenna substrate (1) include resins such as polyester resin, polyethylene resin, polypropylene resin, polyimide resin, PET, and PET-G.

<Material of antenna pattern (2)>
As a material for forming the antenna pattern (2), copper, aluminum, gold, silver, iron, tin, nickel, zinc, titanium, tungsten, solder, an alloy, or the like is applicable. As a method for forming the antenna pattern (2) on the antenna substrate (1), an etching method or a printing method (screen printing method or offset printing method) can be applied. It is also possible to form the antenna pattern (2) on the antenna substrate (1) by a winding method.

<Adhesive (4)>
The adhesive (4) is for connecting the antenna pattern (2) formed on the antenna substrate (1) and an electronic component such as an IC chip (3), and is an ultraviolet curable resin or a moisture curable resin. Resin, thermosetting resin, etc. are applicable. When the antenna pattern (2) and the electronic component such as the IC chip (3) are connected, a thermosetting epoxy resin or fine conductive particles of about several μm are dispersed in the epoxy resin. It is preferable to carry out by a flip chip method through an adhesive such as an anisotropic conductive adhesive (ACP) or an anisotropic conductive film (ACF) formed by forming an ACP into a film. ACF is an adhesive in which conductive particles such as nickel, metal-coated plastic, or the like, or metal particles themselves are dispersed in an adhesive such as an epoxy resin.

<Magnetic recording layer (13)>
The magnetic recording layer (13) uses a polyester film such as a polyethylene film or a polyester film as a support, and a fine powder of a ferromagnetic material such as iron or alloy is applied to the film surface together with a binder and dried. The magnetic layer is preferred.

  Next, the shape of the antenna pattern (2) provided in the non-contact IC card of this embodiment will be described with reference to FIG. 2 is a top view showing a state in which the antenna pattern (2) is formed on the antenna substrate (1) shown in FIG. 1, and the antenna pattern (2) having a polygonal shape including at least a straight line portion is used as the antenna. It is a figure which shows the structure at the time of forming on a board | substrate (1).

  On the antenna substrate (1) included in the non-contact IC card of the present embodiment, as shown in FIG. 2, an antenna coil (21) serving as an inductance L is provided around the insulating antenna substrate (1). In addition to being formed in a spiral shape, a capacitor (22) serving as a combined capacitance C is formed inside the antenna coil (21).

  Note that the non-contact IC card in this embodiment includes an antenna coil (21) formed on the antenna substrate (1) as shown in FIG. 2, and magnetic recording to be arranged on the antenna coil (21). When the antenna coil region (overlapping region) (23) where the layer (13) overlaps changes, the apparent inductance L changes due to a partial change in magnetic flux density of the antenna coil (21). become. For this reason, the resonance frequency f also changes.

  Note that the resonance frequency of the LC resonance circuit is calculated by the following equation (1).

f = 1 / 2π√ (LC) Formula (1)
f: resonance frequency L: inductance of antenna coil (21) C: combined capacitance of capacitor (22)

  Therefore, when the non-contact IC card in the present embodiment is manufactured, if the antenna coil region (overlapping region) (23) where the antenna coil (21) and the magnetic recording layer (13) overlap is changed, the non-contact IC card changes. A different resonance frequency f is set for each contact IC card, and it becomes difficult to manufacture a non-contact IC card that maintains a uniform resonance frequency f.

  For this reason, as shown in FIG. 3A, the non-contact IC card in this embodiment has an antenna coil (21) formed on the antenna substrate (1) in the longitudinal direction of the magnetic recording layer (13). The magnetic recording layer (13) is formed in a shape external to both, and is arranged in a non-contact IC card.

  In the conventional non-contact IC card, as shown in FIG. 4A, no consideration is given to the overlapping region (23) where the antenna coil (21) and the magnetic recording layer (13) on the antenna substrate (1) overlap. For example, the antenna coil (21) is not formed at a predetermined position of the antenna substrate (1), and the magnetic recording is performed using the antenna substrate (1) on which the antenna coil (21) is formed. A non-contact IC card provided with the layer (13) is formed, and the arrangement position of the antenna coil (21) and the magnetic recording layer (13) is changed as shown in FIG. When the overlapping region (23) where the (21) and the magnetic recording layer (13) overlap is changed, or when the non-contact IC card provided with the magnetic recording layer (13) is formed, the antenna coil (21) As shown in FIG. 4B, an arrangement position between the antenna coil (21) and the magnetic recording layer (13) is generated as a result of displacement of the antenna substrate (1) thus formed and the magnetic recording layer (13). Changes, the overlapping area (23) changes, or the position where the card magnetic recording layer (13) is provided is shifted, and as shown in FIG. 4B, the antenna coil (21) is changed. If the arrangement position of the magnetic recording layer (13) is changed and the overlapping area (23) is changed, a contactless IC card having uniform communication characteristics cannot be obtained. It will end up.

  On the other hand, as shown in FIG. 3A, the non-contact IC card in the present embodiment has the antenna coil (21) in both the magnetic recording layer (13) in the longitudinal direction of the magnetic recording layer (13). The antenna coil (21) and the magnetic recording layer (13) are formed on the antenna substrate (1) in an external shape and disposed in a non-contact IC card as shown in FIG. 3 (b). Even if the arrangement position of the magnetic recording layer (13) is changed, an overlapping region where the magnetic recording layer (13) and the antenna coil (21) overlap with each other due to the antenna portion (24) external to both of the magnetic recording layers (13). Since (23) is always uniform, it is possible to form a contactless IC card with good communication characteristics and uniform communication characteristics.

  As shown in FIG. 3A, the antenna coil (21) formed on the antenna substrate (1) has an antenna portion (24) external to both of the magnetic recording layers (13). Although it is possible to form in a shape protruding on both of the layers (13), as shown in FIG. 5, the antenna portion (24) external to both of the magnetic recording layers (13) has a magnetic recording. It is also possible to form in a shape in which a plurality of portions protrude from both layers (13).

  As described above, the antenna coil (21) formed on the antenna substrate (1) of the present embodiment has the antenna portion (24) existing outside both the magnetic recording layer (13) and the magnetic recording layer. By forming a shape in which at least a part protrudes in both (13), the arrangement positions of the antenna coil (21) and the magnetic recording layer (13) change as shown in FIG. 3 (b). Even if this happens, the area (23) where the magnetic recording layer (13) and the antenna coil (21) overlap is always uniform, so the communication characteristics are good and the communication characteristics can be uniform. It becomes.

<Method for forming antenna pattern (2)>
Next, a method for forming the antenna pattern (2) formed on the antenna substrate (1) will be described.

  The antenna pattern (2) formed on the antenna substrate (1) is preferably formed using a technique such as etching. Etching can form a precise antenna pattern (2) on the antenna substrate (1) accurately.

  For example, as a method of forming the first antenna pattern (2), etching is performed on both surfaces of the antenna substrate (1), and the antenna pattern (2) is formed on one surface of the antenna substrate (1). Further, there is a method in which a jumper portion is formed on the other surface of the antenna substrate (1), and the formed antenna pattern (2) is electrically connected to the jumper portion through a through hole. As a method of providing a through hole when the antenna pattern (2) is formed on one surface of the antenna substrate (1) by etching and the jumper portion is formed on the other surface of the antenna substrate (1). The method of “caulking” is also applicable.

  Further, as a method of forming the second antenna pattern (2), etching is performed on one surface of the antenna substrate (1), and the antenna coil (21), the IC mounting portion, and the capacitor (22) shown in FIG. 2 are included. The antenna pattern (2) is formed, and conductive paste is screen-printed on the other surface of the antenna substrate (1) to form the jumper portion shown in FIG. 1 and formed on one surface of the antenna substrate (1). There is a method of electrically connecting the antenna pattern (2) and the jumper portion formed on the other surface of the antenna substrate (1) through a through hole.

  In the method for forming the first and second antenna patterns (2) described above, the metal foil is laminated on the antenna substrate (1) by laminating the metal foil. It is also possible to attach a metal foil using an adhesive. In addition, as an adhesive agent, adhesive agents, such as an epoxy resin, a polyurethane resin, a polyester resin, an acrylic resin, can be applied, for example. It is also possible to form a metal foil on a plastic antenna substrate (1) by “evaporation”.

  The above-described embodiment is a preferred embodiment of the present invention, and the scope of the present invention is not limited to the above-described embodiment alone, and various modifications are made without departing from the gist of the present invention. Implementation is possible. For example, the capacitor pattern (2) formed on the antenna substrate (1) can be formed using a known forming method. Further, the antenna coil (21) formed on the antenna substrate (1) is externally provided in both directions via the magnetic recording layer (13) as shown in FIGS. The antenna coil (21) is formed on the antenna substrate (1) so that the portion (23) is parallel to the magnetic recording layer (13). However, as shown in FIG. 13) It is also possible to form the antenna coil (21) on the antenna substrate (1) so that the antenna portions (23) existing on both sides have a curved shape.

  Thus, the antenna coil (21) formed on the antenna substrate (1) of the present embodiment overlaps with the magnetic recording layer (13) even when the antenna coil (1) is slightly displaced. If it is formed on the antenna substrate (1) in a shape that does not change the region, it can be formed in any shape without any particular limitation.

  The contactless IC card according to the present invention is used for commuter passes, coupon tickets, telephone cards, cards for entering and exiting specific areas, ID cards, licenses, pachinko, amusement parks, movie theaters, etc. The present invention can be applied to an information recording medium that performs communication processing in a non-contact manner such as a credit card or a credit card.

It is a figure which shows the structure of the non-contact IC card in this embodiment. It is a figure which shows the shape of the antenna pattern (2) arrange | positioned in the non-contact IC card in this embodiment. It is an enlarged view which shows the shape of the antenna coil (21) arrange | positioned in the non-contact IC card in this embodiment, (a) has the arrangement shift with an antenna coil (21) and a magnetic-recording layer (23). It is a front figure, (b) is a figure after arrangement | positioning shift | offset | difference arises. It is an enlarged view which shows the shape of the antenna pattern (21) arrange | positioned in the conventional non-contact IC card, (a) is before arrangement | positioning deviation with an antenna coil (21) and a magnetic-recording layer (23) arises. It is a figure, (b) is a figure after arrangement | positioning deviation arises. It is an enlarged view which shows the 1st modification of the shape of the antenna pattern (2) arrange | positioned in the non-contact IC card in this embodiment. It is an enlarged view which shows the 2nd modification of the shape of the antenna pattern (2) arrange | positioned in the non-contact IC card in this embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Antenna board | substrate 2 Antenna pattern 3 IC chip 4 Adhesive 10 Inlet sheet 11 Core sheet 12 Oversheet 13 Magnetic recording layer 21 Antenna coil 22 Capacitor 23 Overlapping area 24 Antenna part existing from magnetic recording layer (13)

Claims (3)

A card substrate, a coiled antenna wound in a plurality of turns embedded in the card substrate, an IC chip connected to the antenna embedded in the card substrate, and the card And a magnetic recording portion provided at a predetermined position on the surface of the substrate,
The width per one antenna is narrower than the width of the magnetic recording unit, and the width from the innermost antenna to the outermost antenna in the longitudinal direction of the magnetic recording unit is the same as that of the magnetic recording unit. are arranged so as overlapping, and non-contact, characterized by comprising arranged such that at least the innermost antenna and outermost antenna is extrinsic to both the width direction of the magnetic recording portion IC card.   2. The non-contact IC according to claim 1, wherein at least a part of the antenna external to both of the width directions of the magnetic recording portion is arranged in a shape protruding from the width direction of the magnetic recording portion. card.   3. The non-contact IC according to claim 1, wherein the antenna is arranged in a shape in which an area overlapping with the magnetic recording unit does not change even when the arrangement position of the antenna is slightly shifted. 4. card.

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