JP2013174948A - Communication medium - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a communication medium that can be applied to a small product size communication medium capable of performing communication in both of a non-contact state and a contact state and is not susceptible to noise, and in which a communication distance in non-contact communication can be extended.SOLUTION: A communication medium has a configuration in which an antenna coil 16 and an auxiliary antenna coil 17 are provided on both surfaces of a base material 15 mounted on a magnetic body 14.

Description

  The present invention relates to a communication medium that has at least one IC chip and an antenna therein and can communicate data both in a non-contact manner and in a contact manner, and particularly relates to a communication medium having an antenna coil and an auxiliary antenna coil. .

  Conventionally, as a contact type communication medium, a contact type IC card, a SIM (Subscriber Identity Module) card, and the like are known. In recent years, there is a need for a communication medium that has a function of performing non-contact communication corresponding to various services in addition to a contact communication medium such as a SIM card having a limited external dimension because it needs to be built in a mobile phone. However, since the product size of the communication medium is small, there are restrictions on the shape and size of the antenna, and it is a problem that the communication distance with the external device during non-contact communication is short. In non-contact communication, a technique of providing an auxiliary antenna on a communication medium is known in order to extend a communication distance with an external device.

  For example, Patent Document 1 discloses an IC card that extends a communication distance by inducing a secondary voltage by an antenna coil that resonates with external radio waves and an auxiliary antenna coil that is electromagnetically coupled to the antenna coil. A power supply apparatus is disclosed.

  Patent Document 2 discloses a non-contact type data carrier device that can extend the communication distance by an auxiliary antenna coil that can adjust the resonance frequency.

JP 2000-50534 A JP 2001-319207 A

  However, in the IC card power supply device described in Patent Document 1, since power is supplied by a coil, there is a problem that it is easily affected by its own noise and it is difficult to reduce the size of the coil.

  Further, the non-contact data carrier device and the auxiliary antenna described in Patent Document 2 have a problem that they are easily affected by external noise.

  Therefore, the present invention can cope with a communication medium capable of communicating both in a non-contact manner and in a contact manner with a small product size, and is less susceptible to noise and can extend the communication distance in non-contact communication. Provide a communication medium.

  In order to solve the above-described problems, the present invention comprises a communication medium in which an antenna coil and an auxiliary antenna coil are arranged on both sides of a base material.

  That is, according to the present invention, a communication medium that performs both non-contact communication and contact communication with an external device, the circuit board including an external terminal for the contact communication, and opposite to the external terminal of the circuit board An IC chip mounted on a surface, a magnetic body placed on the surface of the circuit board on which the IC chip is mounted, an insulating base placed on the magnetic body, and an insulating base A communication medium comprising an antenna coil arranged on both sides and an auxiliary antenna coil arranged in parallel with the antenna coil is obtained.

  Moreover, according to this invention, the said magnetic body has said penetration part, The said communication medium characterized by the above-mentioned is obtained.

  In addition, according to the present invention, it is possible to obtain the above communication medium characterized in that the number of turns of the antenna coil is smaller than the number of turns of the auxiliary antenna coil.

  In addition, according to the present invention, it is possible to obtain the above communication medium, wherein the antenna coil and the auxiliary antenna coil have the same coil pattern width.

  In addition, according to the present invention, the above-described communication medium, which is a SIM card, is obtained.

  In order to increase the communication distance in non-contact communication, it is preferable that the Q of the auxiliary antenna coil is made higher than the Q of the antenna coil.

  Moreover, it is preferable that the antenna coil and the auxiliary antenna coil have the same shape, and the coupling between the two antenna coils is strengthened to enhance the effect of the auxiliary antenna coil.

  INDUSTRIAL APPLICABILITY The present invention can cope with a product of a communication medium that can communicate both in a small non-contact manner and in a contact state, and further has an effect of being less susceptible to noise and extending a communication distance in non-contact communication. Play.

1 is a perspective view of a communication medium according to the present invention. The AA sectional view in the communication medium of Drawing 1 concerning the present invention. The block diagram of the circuit board of the communication medium which concerns on this invention. FIG. 3A is a plan view. FIG. 3B is a transmission bottom view. The top view of the magnetic body of the communication medium which concerns on this invention. The coil pattern figure of the antenna coil and auxiliary antenna coil of the communication medium which concerns on this invention. FIG. 5A is a plan view. FIG. 5B is a transmission bottom view.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  An embodiment will be described using a SIM card used in a mobile phone or the like as a communication medium that performs both contactless communication and contact communication with an external device. FIG. 1 is a perspective view of a communication medium according to the present invention. 2 is a cross-sectional view taken along line AA in the communication medium of FIG. 1 according to the present invention.

  The communication medium 11 includes an external base 13 for performing contact communication, a circuit board 12 on which electronic components are mounted, and an insulating base material 15 provided with an antenna coil 16 and an auxiliary antenna coil 17 for performing non-contact communication. ing. The front surface wiring pattern 24a of the wiring pattern 24 provided on the circuit board 12 and the external terminal 13 are connected by soldering, and the IC chip 18 and the capacitor are placed on the back surface wiring pattern 24b of the wiring pattern 24 provided on the opposite surface of the external terminal 13. 19 electronic components are mounted and connected to the backside wiring pattern 24b by wires 21 or solder. Thereafter, the electronic component mounted on the circuit board 12 is protected by the chip mold 22. It is composed of a magnetic body 14 disposed on the mounting side of the IC chip 18 on the circuit board 12, an antenna coil 16 and an auxiliary antenna coil 17 disposed on both surfaces of the insulating base material 15 on the magnetic body 14, and a mold resin. Thus, the exterior mold 23 is formed, and the communication medium 11 is obtained.

  FIG. 3 is a configuration diagram of a circuit board of a communication medium according to the present invention. FIG. 3A is a plan view. FIG. 3B is a transmission bottom view. For ease of explanation, the back side configuration diagram of the circuit board is shown transparently. The circuit board 12 is made of glass epoxy or the like, and a recess for mounting the external terminal 13 for contact communication is formed on one side of the circuit board 12, and a copper foil is etched on both sides of the circuit board 12 to form a wiring pattern 24. . The wiring pattern 24 is formed on both surfaces of the circuit board 12, and the surface on which the external terminals 13 are mounted is referred to as a front surface wiring pattern 24a, and the opposite side is referred to as a back surface wiring pattern 24b. The external terminals 13 for contact communication are mounted on the surface of the circuit board 12 by bonding while being electrically connected to the surface wiring pattern 24a by solder. In the external terminal 13, the front surface wiring pattern 24 a and the back surface wiring pattern 24 b of the circuit board 12 are electrically connected by a via hole 26. Electronic components such as an IC chip 18 and a capacitor 19 are mounted on the back surface wiring pattern 24b of the circuit board 12, and are electrically connected to the back surface wiring pattern 24b by wires 21 or solder. In order to connect the antenna coil 16 and the auxiliary antenna coil 17 for non-contact communication, an antenna coil connection terminal 20 a and an auxiliary antenna coil connection terminal 20 b are provided as the connection terminals 20. An IC module is configured by molding a mounting portion of an electronic component. An IC chip 18 that can handle both non-contact communication and contact communication is used. At that time, the connection terminal 20 for connecting the IC module and the antenna is provided outside the range of the mold, and then connected to the antenna. Also, the IC chip 18 and the capacitor 19 are mounted on the back surface of the external terminal 13 for contact communication, and the surface of the electronic component is molded to form an IC module. The electronic component of the IC module is mounted on the circuit board 12. An IC module may be mounted on the circuit board 12 provided with a penetrating portion so as not to collide.

  FIG. 4 is a plan view of the magnetic body of the communication medium according to the present invention. A magnetic sheet 14 is produced by bonding a ferrite sheet on a flexible substrate made of a film-like insulator. According to the shape of the circuit board 12 and the antenna, the penetrating portion 25 having a shape that does not collide with an electronic component such as the IC chip 18 is manufactured by a die cutting process such as pressing. At this time, it is preferable that the shape of the magnetic body 14 is large so as to completely cover the shape of the antenna. Thereby, it becomes possible to make the structure more resistant to noise.

  FIG. 5 is a coil pattern diagram of the antenna coil and auxiliary antenna coil of the communication medium according to the present invention. FIG. 5A is a plan view. FIG. 5B is a transmission bottom view. For ease of explanation, the back surface of the coil pattern diagram is shown transparent. The antenna coil 16 and the auxiliary antenna coil for non-contact communication are formed by etching a copper foil formed on the front and back surfaces of the insulating base material 15 made of a polyimide film. The antenna coil 16 and the auxiliary antenna coil 17 that are formed so as to face the front and back surfaces of the insulating base material 15 are connected by a via hole 26 to become one antenna coil 16 and one auxiliary antenna coil 17, respectively. In addition, an antenna coil connection electrode 27 a and an auxiliary antenna coil connection electrode 27 b are provided as connection terminal electrodes 27 in order to connect to the connection terminals 20 of the circuit board 12. By making the number of turns of the antenna coil 16 for non-contact communication smaller than the number of turns of the auxiliary antenna coil 17, the Q of the auxiliary antenna coil 17 can be increased and the communication distance in non-contact communication can be extended. . The coil patterns of the antenna coil 16 and the auxiliary antenna coil 17 provided on the front and back surfaces of the insulating base material 15 are provided so as to form loops in the same direction as viewed from the front surface with respect to the insulating base material 15. The communication distance in contact communication is extended.

  Finally, as shown in FIG. 2, the insulating base material 15 on which the antenna is formed and the penetrating portion 25 of the magnetic body 14 are aligned and bonded, and further aligned with the circuit board 12 on which the external terminals 13 are mounted. Mounted. The antenna coil connection terminal 20a and the auxiliary antenna coil connection terminal 20b of the connection terminal 20 provided on the circuit board 12, and the antenna coil connection electrode 27a and the auxiliary antenna coil connection electrode of the connection terminal electrode 27 provided on the insulating base 15 are provided. 27b is connected by soldering. Thereby, the antenna coil 16 for non-contact communication and the electronic components such as the IC chip 18 and the capacitor 19 are connected, and the auxiliary antenna coil 17 and the capacitor 19 are connected. Then, it transfers to the type | mold of a communication medium, the exterior mold 23 is formed with mold resin, and the communication medium 11 is completed.

  Hereinafter, embodiments of the present invention will be described in detail by taking a SIM card as an example.

Example 1
The SIM card is a card that performs information communication with the outside through an external terminal 13 for contact communication as shown in FIG. The communication medium 11 of the present invention is a SIM card that newly has a non-contact communication function in addition to the conventional contact communication function.

  As shown in FIG. 3, the circuit board 12 has an outer dimension of 25 mm × 15 mm, and is connected to a recess for mounting the external terminals 13 for contact communication on both surfaces of an insulating base material made of glass epoxy having a thickness of 100 μm. After forming the through hole, a 30 μm copper foil was plated, and the wiring pattern shown in FIG. 3 was formed by etching.

  The magnetic body 14 shown in FIG. 4 was obtained by bonding a ferrite sheet having a relative magnetic permeability of 100 μm and a thickness of 200 μm to a flexible printed circuit board that is a film-like insulator. Further, as shown in FIG. 2, the magnetic body 14 having an outer dimension of 24 mm × 14 mm having a through portion 25 of 18 mm × 8 mm so that the IC chip 18 mounted on the circuit board 12, the capacitor 19 and the connection terminal 20 do not contact each other. It was made by punching with a press.

  The insulating base material 15 forming the antenna coil 16 and the auxiliary antenna coil 17 was a polyimide film having an outer dimension of 24 mm × 14 mm and a thickness of 25 μm. A copper foil of 30 μm was plated on both surfaces of the insulating base material 15, and an antenna coil pattern as shown in FIGS. 5 (a) and 5 (b) was formed by etching. The coil pattern widths of the antenna coil 16 and the auxiliary antenna coil 17 were the same at 200 μm, and the coil pattern interval was 100 μm. The antenna for non-contact communication was produced using both sides of the insulating base material 15 by connecting via holes 26. The number of turns of the antenna coil 16 was 4 turns on both sides of the insulating base material 15, and the number of turns of the auxiliary antenna coil was 6 turns on both sides of the insulating base material 15.

  The insulating base material 15 on which the antenna was formed and the penetrating portion 25 of the magnetic body 14 were aligned and bonded, and the circuit board 12 was aligned and overlapped. The connection terminal 20 of the circuit board 12 and the connection terminal electrode 27 of the insulating base material 15 were connected. Then, it moved to the type | mold of the communication medium, the exterior mold 23 was formed with mold resin, and the communication medium as shown in FIG. 2 was produced.

(Example 2)
In Example 2, the number of turns of the auxiliary antenna coil was reduced once from Example 1, and the communication medium was manufactured in the same manner for the others. Therefore, the number of turns of the antenna coil 16 is 4 turns on both sides of the insulating base material 15, and the number of turns of the auxiliary antenna coil is 5 turns on both sides of the insulating base material 15.

(Comparative Examples 1 and 2)
As a comparison with the communication medium of the present invention, the antenna coil for performing non-contact communication was manufactured by changing the number of turns and the number of turns of the auxiliary antenna coil. Other than that, like the embodiment, the coil pattern width of the antenna coil and the auxiliary antenna coil was 200 μm, and the coil pattern interval was 100 μm. As a comparative example 1, an antenna coil for non-contact communication and a communication medium for auxiliary antenna coil having the same number of turns were prepared. Further, a communication medium having six turns of the antenna coil and more turns than four turns of the auxiliary antenna coil was manufactured as Comparative Example 2.

  The communication performance at the time of non-contact communication in Examples 1 and 2 and Comparative Examples 1 and 2 was performed by measuring a communication distance with an external device. A commercially available ViVOpay 5000 (manufactured by ViVOtech) was used as an external device that performs non-contact communication with a communication medium. Create a jig that can set the distance to the communication medium on the external device, and increase the distance by 1 mm up to 25 mm while checking whether contactless communication can be performed 10 times or more continuously from a distance of 5 mm. It was measured. Table 1 shows the measurement results of the communication distance at the time of non-contact communication in each communication medium.

  From Table 1, it was confirmed from Comparative Examples 1 and 2 that Examples 1 and 2 in which the number of turns of the antenna coil of the communication medium is smaller than the number of turns of the auxiliary antenna coil have a longer communication distance.

(Comparative Example 3)
As a comparison with the communication medium of Example 1 of the present invention, the coil pattern width of the antenna coil and the auxiliary antenna coil for performing non-contact communication is changed, and the number of turns of the antenna coil is changed to 4 turns in the same manner as in Example 1. A comparative example 3 was manufactured in which the number of turns of the antenna coil was 6 turns, the coil pattern interval between the antenna coil and the auxiliary antenna coil was 100 μm, and the coil pattern width of the antenna coil and the auxiliary antenna coil was 100 μm.

  The communication performance of the communication medium during non-contact communication in Example 1 and Comparative Example 3 was measured based on the communication distance with the external device. A commercially available ViVOpay 5000 (manufactured by ViVOtech) was used as an external device that performs non-contact communication with a communication medium. Create a jig that can set the distance to the communication medium on the external device, and increase the distance by 1 mm up to 25 mm while checking whether contactless communication can be performed 10 times or more continuously from a distance of 5 mm. It was measured. Table 2 shows the measurement results of the communication distance at the time of non-contact communication in each communication medium.

  From Table 2, when the coil pattern width of the antenna coil of a communication medium and the auxiliary antenna coil was made the same, it has confirmed that the distance which can communicate was changing greatly with coil pattern width. By making the antenna coil and the auxiliary antenna coil have the same shape, the coupling between the two antenna coils can be strengthened. In addition, man-hours for design and manufacturing can be reduced.

  The embodiments of the present invention have been described above using the embodiments. However, the present invention is not limited to these embodiments, and the present invention is not limited to the scope of the present invention. Included in the invention. That is, various changes and modifications that can be naturally made by those skilled in the art are also included in the present invention.

DESCRIPTION OF SYMBOLS 11 Communication medium 12 Circuit board 13 External terminal 14 Magnetic body 15 Insulation base material 16 Antenna coil 17 Auxiliary antenna coil 18 IC chip 19 Capacitor 20 Connection terminal 20a Antenna coil connection terminal 20b Auxiliary antenna coil connection terminal 21 Wire 22 Chip mold 23 Exterior mold 24 wiring pattern 24a front surface wiring pattern 24b back surface wiring pattern 25 penetrating portion 26 via hole 27 connection terminal electrode 27a antenna coil connection electrode 27b auxiliary antenna coil connection electrode

Claims (5)

A communication medium that performs both contactless communication and contact communication with an external device,
A circuit board comprising external terminals for the contact communication;
An IC chip mounted on the surface opposite to the external terminal of the circuit board;
A magnetic body placed on a surface of the circuit board on which the IC chip is mounted;
An insulating base placed on the magnetic body;
An antenna coil arranged on both surfaces of the insulating substrate;
A communication medium comprising an auxiliary antenna coil arranged in parallel with the antenna coil.   The communication medium according to claim 1, wherein the magnetic body has a penetrating portion.   The communication medium according to claim 1, wherein the number of turns of the antenna coil is smaller than the number of turns of the auxiliary antenna coil.   The communication medium according to claim 1, wherein the antenna coil and the auxiliary antenna coil have the same coil pattern width.   The communication medium according to claim 1, wherein the communication medium is a SIM card.

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