JP5746543B2 - Non-contact communication medium - Google Patents

Description

  The present invention relates to a non-contact communication medium having at least one IC chip and an antenna and capable of transmitting / receiving information to / from an external device in a non-contact manner.

  A non-contact communication medium capable of storing information and transmitting / receiving information to / from an external device includes an IC having a function of controlling storage and transmission / reception of information and an antenna for transmitting / receiving electromagnetic waves, Widely used as an IC tag. Such an individual identification technique using a non-contact communication medium is called RFID (Radio Frequency IDentification), and communication is performed via electromagnetic induction or radio waves. As the radio frequency of the communication, the 125 kHz band and the 13.56 MHz band are used when communicating by electromagnetic induction, and the 800 MHz band to the 1000 MHz band, the 2400 MHz band, and the like are often used when communicating by radio waves. In particular, a non-contact communication medium using the 13.56 MHz band by electromagnetic induction has been put into practical use as electronic money, a traffic ticket or the like. A specific example of RFID technology using such electromagnetic induction is disclosed in Patent Document 1 and the like.

  FIG. 11 is a perspective view for explaining the principle of communication between a non-contact communication medium using conventional electromagnetic induction and an external reader. When a current flows through the antenna coil 201 installed in the reader 200, a magnetic field is generated. Via the generated magnetic flux 50, the antenna coil 201 and the antenna coil 101 installed in the non-contact communication medium 100 are coupled by electromagnetic induction, and power is supplied from the reader 200 to the non-contact communication medium 100 in a non-contact manner. Is possible. Furthermore, since the magnetic field can be changed by changing the current flowing through the antenna coil 201 of the reading device 200, a signal can be transmitted to the non-contact communication medium 100. Further, in the non-contact communication medium 100, since the load of the antenna coil 201 of the reading device 200 is changed by changing the load of the antenna coil 101, the reading device 200 detects the change in the load, thereby making contactless. A signal from the communication medium 100 can be received.

  In such a non-contact communication medium using electromagnetic induction, since communication is performed via a magnetic field as described above, there is a problem that communication is disturbed due to the presence of metal in the surroundings. Therefore, attempts have been made to solve this problem by combining a magnetic material with a non-contact communication medium, and an example of such a technique is disclosed in Patent Document 2.

  A conventional non-contact communication medium is, for example, electrically connected by fixing an IC chip with an adhesive on an antenna sheet on which an antenna is formed by etching a metal foil adhered on a film. It is manufactured by a method such as die-bonding by adhering a resin sheet on both sides. In recent years, a technology has also been realized in which an antenna and an IC chip for non-contact communication are mounted on a mobile terminal and the mobile terminal itself functions as a non-contact communication medium. By using this technology, it is possible to make one mobile terminal function like multiple communication media by installing a plurality of applications in the mobile terminal in advance or downloading a new application through a communication line. Become.

  On the other hand, in non-contact communication, its power supply capability and communication speed are limited, so contact communication is required when higher speed communication is required or when more power is required to operate the IC. A contact-type communication medium provided with an external terminal is used. For example, such a contact-type communication medium is used when a high level of encryption is required for security, and is used for cash cards and credit cards of financial institutions. In addition, recent portable terminals are equipped with a small contact communication medium called a SIM (Subscriber Identity Module) card, and a communication carrier identifies subscriber information based on a number stored in a memory in the SIM card. ing. Some non-contact communication media have an external terminal for contact communication as described above, which is disclosed in Patent Document 3 and the like.

JP-A-4-256089 JP-A-8-16745 JP 60-179891 A

  However, non-contact communication media that perform communication by electromagnetic induction are affected by the communication performance of the surrounding environment, especially when the metal approaches, the communication distance becomes extremely short or communication becomes impossible There's a problem. Further, there is a problem that the communication distance becomes shorter as the size of the antenna becomes smaller. For example, when electromagnetic induction is used, the communication is performed via a magnetic field, and metal interferes with the magnetic field. Therefore, when the antenna and the metal are in close contact, communication is almost impossible. In addition, since the strength of the generated magnetic field depends on the size of the antenna, the communication distance is significantly shortened even when the size of the medium is greatly reduced compared to the size of a generally used IC card. On the other hand, non-contact communication media are required to be miniaturized and used in environments where there are many metals, such as the inside of an apparatus. In addition, when applied to a SIM card, the external terminal for contact communication is arranged close to the antenna.

  Therefore, an object of the present invention is to provide a non-contact communication medium that is small in size and hardly affected by the surroundings and can ensure a long communication distance.

In order to solve the above problems, a non-contact communication medium according to the present invention is a non-contact communication medium having a multilayer structure and having a function of transmitting and receiving information to and from an external device using electromagnetic induction. An IC having a function of controlling transmission / reception of the information, an antenna coil connected to the IC, a resonance coil not connected to any of the antenna coil and the IC, and connected to the resonance coil A capacitor and a magnetic body, wherein the antenna coil, the resonance coil, and the magnetic body are disposed in different layers, and the layer having the antenna coil is a layer having the resonance coil; wherein disposed between the layer having a magnetic, said antenna coil and said resonant coil electromagnetically coupled, wherein the magnetic body is provided with holes, the holes in the layer having the magnetic body The IC is characterized in that it is arranged at a position.
In order to solve the above problems, a non-contact communication medium according to the present invention is a non-contact communication medium having a multilayer structure and having a function of transmitting and receiving information to and from an external device using electromagnetic induction. An IC having a function of controlling transmission / reception of the information, an antenna coil connected to the IC, a resonance coil not connected to any of the antenna coil and the IC, and connected to the resonance coil A capacitor and a magnetic body, wherein the antenna coil, the resonance coil, and the magnetic body are disposed in different layers, and the layer having the antenna coil is a layer having the resonance coil; The antenna coil and the resonance coil are electromagnetically coupled to each other, and the antenna coil and the resonance coil have a multi-layered conductor layer. A first short-circuit electrode that is formed on different conductor layers of the substrate and short-circuits the start point and end point of the antenna coil, and a second short-circuit electrode that short-circuits the start point and end point of the resonance coil are formed of the multilayer It is formed in the same conductor layer of the board | substrate which has a conductor layer, It is characterized by the above-mentioned.
In order to solve the above problems, a non-contact communication medium according to the present invention is a non-contact communication medium having a multilayer structure and having a function of transmitting and receiving information to and from an external device using electromagnetic induction. An IC having a function of controlling transmission / reception of the information, an antenna coil connected to the IC, a resonance coil not connected to any of the antenna coil and the IC, and connected to the resonance coil A capacitor and a magnetic body, wherein the antenna coil, the resonance coil, and the magnetic body are disposed in different layers, and the layer having the antenna coil is a layer having the resonance coil; The antenna coil and the resonance coil are electromagnetically coupled to each other, and have an external terminal, and contact with the external device by contact with the external terminal. In having a function of transmitting and receiving information, said external terminal, said the layer having the antenna coil of the magnetic material is disposed side, characterized in that it is arranged on the opposite side.
In order to solve the above problems, a non-contact communication medium according to the present invention is a non-contact communication medium having a multilayer structure and having a function of transmitting and receiving information to and from an external device using electromagnetic induction. An IC having a function of controlling transmission / reception of the information, an antenna coil connected to the IC, a resonance coil not connected to any of the antenna coil and the IC, and connected to the resonance coil A capacitor and a magnetic body, wherein the antenna coil, the resonance coil, and the magnetic body are disposed in different layers, and the maximum dimension and the minimum dimension of the outer shape of the resonance coil are The antenna coil and the resonance coil are electromagnetically coupled at 90% to 110% of the maximum and minimum dimensions of the outer shape of the antenna coil, respectively, and a hole is provided in the magnetic body. It is, wherein the IC to the position of the holes in the layer having the magnetic body is disposed.
In order to solve the above problems, a non-contact communication medium according to the present invention is a non-contact communication medium having a multilayer structure and having a function of transmitting and receiving information to and from an external device using electromagnetic induction. An IC having a function of controlling transmission / reception of the information, an antenna coil connected to the IC, a resonance coil not connected to any of the antenna coil and the IC, and connected to the resonance coil The antenna coil and the resonance coil are disposed in different layers, respectively, and the maximum dimension and the minimum dimension of the outer shape of the resonance coil are respectively the maximum dimension and the minimum dimension of the antenna coil. The antenna coil and the resonance coil are electromagnetically coupled at 90% to 110%, respectively, and the antenna coil and the resonance coil have a multi-layered conductor layer. A first short-circuiting electrode that is formed on different conductor layers of the substrate and short-circuits the start and end points of the antenna coil, and a second short-circuiting electrode that short-circuits the start and end points of the resonance coil, It is formed in the same conductor layer of the board | substrate which has a conductor layer, It is characterized by the above-mentioned.

  Here, at least one of the inside and outside of the IC has a capacitor connected to the antenna coil, and a resonance frequency of a resonance circuit constituted by the resonance coil and a capacitor connected to the resonance coil is equal to the antenna. It is desirable that the resonance frequency be lower than that of a resonance circuit constituted by a coil and a capacitor inside or outside the IC.

  In addition, the maximum dimension and the minimum dimension of the outer shape of the resonance coil may be 90% to 110% of the maximum dimension and the minimum dimension of the outer shape of the antenna coil, respectively.

  The antenna coil and the resonance coil may be formed on different conductor layers of a substrate having a multilayer conductor layer. Alternatively, the resonance coil and the antenna coil are formed side by side on a flexible substrate, and the flexible substrate is bent between the resonance coil and the antenna coil to thereby form the resonance coil and the antenna coil. May be arranged in layers adjacent to each other.

  Here, the total thickness is desirably 0.84 mm or less.

  Further, it may have an external terminal, may have a function of transmitting / receiving information to / from an external device by contact with the external terminal, and may further have a function as a SIM card. .

  As described above, the contactless communication medium of the present invention has a magnetic body, an antenna coil, and a resonance coil arranged in separate layers in this order so that the metal on the outside of the magnetic body is placed inside the magnetic body by the magnetic body. In addition, the magnetic field energy is temporarily retained in the resonance circuit of the resonance coil and the capacitor connected to the resonance coil, and the magnetic field generated by combining it with the antenna coil is strengthened to reduce the communication distance. Has the effect of expanding.

  Furthermore, the resonance frequency of the resonance circuit composed of the resonance coil and the capacitor connected to the resonance coil is made lower than the resonance frequency of the resonance circuit composed of the antenna coil and the capacitor inside or outside the IC. The communication distance can be made longer.

  Also, when miniaturizing a non-contact communication medium, it is better to make the antenna coil as large as possible in order to maximize the communication distance, and similarly, the higher the Q value when the resonance coil is made as large as possible. In addition, it is desirable that the antenna coil and the resonance coil have the same shape in order to strengthen the coupling between the antenna coil and the resonance coil. It is desirable. Specifically, it is desirable that the maximum dimension and the minimum dimension of the outer shape of the resonance coil are 90 to 110% of the maximum dimension and the minimum dimension of the outer shape of the antenna coil, respectively.

  When considering the method of manufacturing a non-contact communication medium according to the present invention, since the antenna coil and the resonance coil are arranged in adjacent layers, the manufacturing can be simplified by forming them in one multilayer substrate. . Further, an antenna coil and a resonance coil are formed on a single flexible substrate, and the antenna coil and the resonance coil can be bent and placed in adjacent layers, which also simplifies manufacturing.

  In the non-contact communication medium according to the present invention, since the influence of external metal is suppressed, even when the external terminal for contact communication is provided, for example, by arranging the external terminal outside the magnetic body, the metal portion Can be less affected by In addition, when a non-contact communication medium is mounted in the apparatus, the influence of other circuits in the apparatus can be suppressed. For example, by applying the present invention to a SIM card or the like used for a portable terminal, a SIM card having a non-contact communication function can be obtained.

  As described above, according to the present invention, it is possible to obtain a non-contact communication medium that is small in size and hardly affected by the surroundings and can ensure a long communication distance.

The typical sectional view shown in order to explain the principle of the non-contact communication medium by the present invention. Sectional drawing which shows typically the change of the magnetic flux when there is no magnetic body. The perspective view which shows the whole multilayer structure in the non-contact communication medium of Example 1 of this invention. The perspective view of the layer which has a resonance coil in the non-contact communication medium of Example 1 of this invention. The perspective view of the layer which has an antenna coil in the non-contact communication medium of Example 1 of this invention. The perspective view of the magnetic body in the non-contact communication medium of Example 1 of this invention. The figure which shows the relationship between the resonant frequency of the resonant circuit by the antenna coil and communication distance in the non-contact communication medium of Example 1 of this invention using the resonant frequency of the resonant circuit by a resonant coil as a parameter. The typical sectional view of the layer which has an antenna coil, and the layer which has a resonance coil in the non-contact communication medium of Example 2 of the present invention. The typical sectional view of the layer which has an antenna coil, and the layer which has a resonance coil in the non-contact communication medium of Example 3 of the present invention. The disassembled perspective view of the non-contact communication medium of Example 4 of this invention. The perspective view explaining the principle of communication between the non-contact communication medium using the conventional electromagnetic induction, and an external reader.

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

  FIG. 1 is a schematic sectional view for explaining the principle of a non-contact communication medium according to the present invention. In FIG. 1, the capacitor connected to the IC and the resonance coil is omitted, but as shown in FIG. 1, the non-contact communication medium of the present invention has a multi-layer structure and is connected to an external device. A non-contact communication medium having a function of transmitting and receiving information using electromagnetic induction, an IC having a function of controlling transmission and reception of the information, an antenna coil 2 connected to the IC, an antenna coil 2 and A resonance coil 1 that is not connected to any of the ICs, a capacitor connected to the resonance coil 1, and a magnetic body 3 are provided. The antenna coil 2, the resonance coil 1, and the magnetic body 3 are disposed in different layers, and the layer having the antenna coil 2 is interposed between the layer having the resonance coil 1 and the layer having the magnetic body 3. The antenna coil 2 and the resonance coil 1 are electromagnetically coupled. Note that FIG. 1 shows a case where the metal body 40 is close to the outside of the magnetic body 3.

  In FIG. 1, the resonance coil 1 is coupled to an external reader, and the antenna coil 2 is coupled to the resonance coil 1. Thus, higher efficiency can be obtained than when only the antenna coil 2 is coupled to the reader. That is, there is an effect that the communication distance is increased. As such a technique, a multi-stage loop antenna or the like is known. In the case of a multi-stage loop antenna, the distance between the loop antennas at each stage needs about ¼ wavelength. On the other hand, in the present invention, the antenna coil 2 and the resonance coil 1 are effective even if they are almost in close contact with each other, and the thickness can be reduced. As a method for producing the resonance coil 1, there are a method in which a copper wire is embedded in a base material and a method in which a metal foil is bonded on the base material and then formed by etching. Furthermore, you may form by printing an electrically conductive paste on a base material. When forming by etching or printing, when wiring across the coil to connect the start point and end point of the coil, the wiring part is formed on the back surface of the substrate, and between the front surface and the back surface, through holes or ultrasonic waves It is electrically connected by a method such as caulking. Or after installing an insulating resist on the surface of the wiring portion on the coil, the wiring may be printed thereon. The antenna coil 2 can also be realized by the same manufacturing method as the resonance coil 1.

  In the non-contact communication medium of the present invention, the magnetic body 3 can suppress the influence of the outer metal. As shown in FIG. 1, even when the metal body 40 is placed close to the magnetic body 3, a magnetic path is generated in the magnetic body 3 due to the presence of the magnetic body 3, so that the magnetic flux incident on the metal body 40 is reduced. As a result, deterioration of the magnetic field strength can be suppressed. FIG. 2 is a cross-sectional view schematically showing a change in magnetic flux when there is no magnetic material. When the magnetic flux 50 generated by the resonance coil 1 and the antenna coil 2 hits the metal body 40, an eddy current 51 is generated on the metal body 40 as shown in FIG. Therefore, the strength of the magnetic flux 50 is weakened.

  As described above, in the present invention, the presence of the magnetic body 3 can suppress the deterioration of the magnetic field strength, and this effect brings about a good effect on both the antenna coil 2 and the resonance coil 1. Will rise more. As the magnetic body 3, ferrite, a flexible magnetic sheet, or the like can be used. Since the magnetic body 3 acts on a magnetic field generated by a current flowing through the coil, the greatest effect can be obtained when it is directly under the coil wire. Therefore, even if a hole is made in a portion other than the portion directly below the coil wire, such as the central portion of the magnetic body 3, the effect of suppressing the deterioration of magnetic flux is preserved, so an IC or other component is placed in the hole portion. Thus, the thickness of the medium can be reduced. Accordingly, the thickness of the medium can be suppressed even when a generally used substrate member is used. For example, a standard of an IC card thickness of 0.68 mm or more and 0.84 mm or less stipulated in ISO / IEC 7810 Can be met.

  As described above, according to the present invention, by providing a magnetic body, an antenna coil, a resonance coil, etc., disposed in different layers, it is small and hardly affected by the surroundings, and a long communication distance can be secured. A contactless communication medium is obtained.

  Hereinafter, specific examples of the present invention will be described.

  First, Embodiment 1 of the non-contact communication medium according to the present invention will be described. FIG. 3 is a perspective view showing the overall configuration of the multilayer structure in the non-contact communication medium according to the first embodiment of the present invention. 4 is a perspective view of a layer having a resonance coil in the non-contact communication medium according to the first embodiment of the present invention. FIG. 5 is a perspective view of a layer having an antenna coil in the non-contact communication medium according to the first embodiment of the present invention. These are the perspective views of the magnetic body in the non-contact communication medium of Example 1 of this invention. As shown in FIG. 3, in the first embodiment, the layer 10 having the resonance coil, the layer 20 having the antenna coil, and the magnetic body 30 are laminated in this order. 4 and 5, the resonance coil 11 and the antenna coil 21 were formed by etching copper foils bonded to both surfaces of base materials 13 and 23 made of polyimide film, respectively. The thickness of the base materials 13 and 23 is 50 μm, the size is 30 × 40 mm, and the thickness of the copper foil is 30 μm. The number of turns of the resonance coil 11 is 2, and the number of turns of the antenna coil 21 is 2. A ceramic capacitor 12 having a capacity of 200 pF is connected to the resonance coil 11 by soldering to form a resonance circuit. On the other hand, a communication control IC 22 connected to the antenna coil 21 is installed on the base material 23 on which the antenna coil 21 is installed. The IC 22 is a 2 mm square chip IC that complies with the communication protocol defined by ISO / IEC 14443 Type-A, and is connected to the antenna coil 21 by flip chip mounting. The radio frequency used for communication is 13.56 MHz. In FIG. 6, a ferrite plate having a thickness of 200 μm and a relative permeability of 80 is used as the magnetic body 30. A hole 31 of 4 mm square is formed in the magnetic body 30, and when the antenna coil base material 23 and the magnetic body 30 are bonded together, the IC 22 enters the hole 31, thereby suppressing the overall thickness and the protrusion portion. There was no structure. Both the antenna coil substrate 23 (FIG. 5) and the magnetic body 30 are bonded together, and the antenna coil substrate 23 and the resonance coil substrate 13 (FIG. 4) are bonded. Tape was used. Further, a double-sided tape (not shown) having a thickness of 150 μm and a release paper 60 (FIG. 3) having a thickness of 100 μm are installed under the magnetic body 30, and the non-contact communication medium of Example 1 is attached to an article for use. I was able to do it. The total thickness of the non-contact communication medium of Example 1 including the release paper 60 was about 0.7 mm.

  The non-contact communication medium of Example 1 and the conventional non-contact communication medium were used by being affixed to components in an assembly line of an electronic device, and a comparative evaluation in manufacturing management application was performed. Conventional non-contact communication media can be read when the parts are assembled into an electronic device case because of the influence of metal inside the device and a distance of 10 mm or more from the component to the case. There wasn't. On the other hand, the non-contact communication medium of Example 1 can be read from the outside of the case even after the device is assembled, and component trace management after the assembly is possible.

  In the present invention, at least one of the inside and the outside of the IC has a capacitor connected to the antenna coil. FIG. 7 shows the relationship between the resonance frequency and the communication distance of the resonance circuit composed of the antenna coil and the capacitor connected to the antenna coil in the non-contact communication medium according to the first embodiment of the present invention. It is a figure which shows the resonant frequency of the resonant circuit comprised by a capacitor | condenser as a parameter. FIG. 7 also shows the result when there is no resonance circuit by the resonance coil. In the first embodiment, the longest communication distance can be obtained when the resonance frequency of the resonance circuit using the antenna coil is 21 MHz and the resonance frequency of the resonance circuit using the resonance coil is 15 MHz with respect to the radio frequency of 13.56 MHz used for communication. It was. In FIG. 7, when a resonance circuit using a resonance coil is installed, a communication distance longer than that of a conventional non-contact communication medium without a resonance coil is obtained except when the resonance frequency of the resonance circuit using a resonance coil is 20 MHz. It has been. Furthermore, when the resonance frequency of the resonance circuit by the resonance coil and the resonance frequency of the resonance circuit by the antenna coil are higher than the radio frequency, and the resonance frequency of the resonance circuit by the resonance coil is lower than the resonance frequency of the resonance circuit by the antenna coil, It has been found that a greater effect can be obtained in extending the communication distance.

  In the non-contact communication medium according to the first embodiment, the resonance coil 11 and the antenna coil 21 as shown in FIGS. 4 and 5 can be formed by a method such as printing of copper wire or conductive paste as described above. . As a material for the base materials 13 and 23, a glass epoxy substrate, a PET (polyethylene terephthalate) film, or the like can be employed. Furthermore, as the magnetic body 30 as shown in FIG. 6, a magnetic body produced by mixing a soft magnetic material with a resin can be employed.

  Next, a second embodiment of the non-contact communication medium according to the present invention will be described. FIG. 8 is a schematic cross-sectional view of a layer having an antenna coil and a layer having a resonance coil in the non-contact communication medium according to the second embodiment of the present invention. In FIG. 8, the resonance coil 111 and the antenna coil 121 are formed in a single substrate composed of two base layers made of glass epoxy and three metal layers disposed between and on the surfaces of those layers. Has been. The resonance coil 111 has a coil pattern formed on the surface of the base material 113, and the antenna coil 121 has a coil pattern formed on the surface of the base material 123. Since the resonance coil 111 and the antenna coil 121 need to finally short-circuit the start point and the end point of the coil pattern, the short-circuit electrode 71 is formed on the metal layer between the base material 113 and the base material 123, and the through hole 70. It is short-circuited by connecting the surface and back surface of each base material via. In this case, as shown in FIG. 8, by arranging the shorting electrodes 71 of the resonance coil 111 and the antenna coil 121 so as not to overlap, the resonance coil 111 and the antenna coil 121 share a shorting metal layer. Both the resonance coil 111 and the antenna coil 121 are realized in one substrate. The magnetic body is disposed below the base material 123 on which the antenna coil 121 is installed.

  FIG. 9 is a schematic cross-sectional view of a layer having an antenna coil and a layer having a resonance coil in the non-contact communication medium according to the third embodiment of the present invention. In Example 3, the resonance coil 111 and the antenna coil 121 are formed side by side on the base material 43 made of a single PET film, and then the base material 43 is bent between the resonance coil 111 and the antenna coil 121. Thus, a structure in which the resonance coil 111 and the antenna coil 121 are arranged in adjacent layers is realized. According to this method, the necessary base material can be reduced, and the ceramic capacitor 12 connected to the resonance coil 111 and the IC 22 connected to the antenna coil 121 can be installed on the same surface. When the ceramic capacitor 12 and the IC 22 are installed by the mounting machine, there is an advantage that the process time can be shortened.

  FIG. 10 is an exploded perspective view of the non-contact communication medium according to the fourth embodiment of the present invention. The fourth embodiment also has a function of performing contact communication with an external device, and is a non-contact communication medium having an external terminal for that purpose. In FIG. 10, the fourth embodiment is configured by a substrate 80 in which an external terminal 81 for contact communication is provided on the back surface in addition to a layer 210 having a resonance coil, a layer 220 having an antenna coil, and a magnetic body 230. The substrate 80 is provided with a non-contact communication IC 22 connected to the antenna coil 221 and a contact communication IC 24 connected to the contact communication external terminal 81 on a base 83. The external terminal 81 is formed on the back surface of the IC mounting surface of the base material 83. A hole 231 is provided in the center of the magnetic body 230 so that the two ICs and the magnetic body 230 are not physically interfered with each other. In addition, the base electrode 223 provided with the antenna coil 221 is formed with a connection electrode 72, and the antenna coil 221 is connected to the IC 22 for non-contact communication by contacting the connection pin 73 installed on the base material 80. Electrically connected. The antenna coil 221 and the IC 22 may be connected by forming a tab-shaped terminal portion on the antenna coil base material 223, bending the portion at the portion of the substrate 80, and connecting by means such as soldering. The resonance coil 211 is formed on the base material 213 in the same manner as the resonance coil of the first embodiment.

  In the non-contact communication medium of Example 4, an IC having a SIM card function was mounted as an IC 24 for contact communication so that it could be used as a SIM card for a mobile phone. In this case, the non-contact communication medium configured as described above was sealed in a case 90 made of plastic. With this mounted on a mobile phone, it was confirmed that communication was possible with an external reader, and the communication distance was 30 mm.

  As described above, the non-contact communication medium of the present invention can be used for article management by being attached to a small metal product, for example, and can also be used for a SIM card having a non-contact communication function.

  Note that the contactless communication medium of the present invention is not limited to the one shown in the above embodiment, and can be changed in design according to the purpose and application. For example, the shape of the antenna coil and the resonance coil, the arrangement in each layer, the shape and material of the substrate on which the antenna coil is mounted, the shape and material of the magnetic body, and the like can be arbitrarily changed. Moreover, it is also possible to add components and members other than the members described in the embodiments according to required functions, performances, and uses.

1, 11, 111, 211 Resonant coil 2, 21, 101, 102, 121, 201, 221 Antenna coil 3, 30, 230 Magnetic body 10, 210 Layer 12 having resonant coil Ceramic capacitors 13, 23, 33, 43, 83, 113, 123, 213, 223 Base material 20, 220 Layer 22, 24 IC with antenna coil
31 and 231 hole 40 metal body 50 magnetic flux 51 eddy current 60 release paper 70 through hole 71 short-circuit electrode 72 connection electrode 73 connection pin 80 substrate 81 external terminal 90 case 100 non-contact communication medium 200 reader

Claims (11)

A non-contact communication medium having a multilayer structure and having a function of transmitting / receiving information to / from an external device using electromagnetic induction, the IC having a function of controlling the transmission / reception of the information, and the IC An antenna coil connected to the antenna coil, a resonance coil not connected to any of the antenna coil and the IC, a capacitor connected to the resonance coil, and a magnetic body, the antenna coil, and the resonance The coil and the magnetic body are disposed in different layers, and the layer having the antenna coil is disposed between the layer having the resonance coil and the layer having the magnetic body, and Electromagnetically coupled to the resonant coil ;
A contactless communication medium , wherein a hole is provided in the magnetic body, and the IC is disposed at the position of the hole in the layer having the magnetic body .   The antenna coil is formed, and includes a substrate on which the IC is mounted.
  The contactless communication medium according to claim 1, wherein a mounting surface of the IC of the substrate and the magnetic body are bonded together. The antenna coil and the resonance coil are formed on different conductor layers of a substrate having a multilayer conductor layer ,
A first short-circuit electrode that short-circuits the start point and end point of the antenna coil and a second short-circuit electrode that short-circuits the start point and end point of the resonance coil are formed on the same conductor layer of the substrate having the multilayer conductor layer. The contactless communication medium according to claim 1, wherein the contactless communication medium is formed. A non-contact communication medium having a multilayer structure and having a function of transmitting / receiving information to / from an external device using electromagnetic induction, the IC having a function of controlling the transmission / reception of the information, and the IC An antenna coil connected to the antenna coil, a resonance coil not connected to any of the antenna coil and the IC, a capacitor connected to the resonance coil, and a magnetic body, the antenna coil, and the resonance The coil and the magnetic body are disposed in different layers, and the layer having the antenna coil is disposed between the layer having the resonance coil and the layer having the magnetic body, and Electromagnetically coupled to the resonant coil;
The antenna coil and the resonance coil are formed on different conductor layers of a substrate having a multilayer conductor layer,
A first short-circuit electrode that short-circuits the start point and end point of the antenna coil and a second short-circuit electrode that short-circuits the start point and end point of the resonance coil are formed on the same conductor layer of the substrate having the multilayer conductor layer. noncontact communication medium, characterized in that it is formed. Has an external terminal, have a function of transmitting and receiving information to and from an external device by contact to said external terminal,
5. The non-contact communication according to claim 1, wherein the external terminal is disposed on a side opposite to a side where the layer having the antenna coil of the magnetic body is disposed. Medium.   A non-contact communication medium having a multilayer structure and having a function of transmitting / receiving information to / from an external device using electromagnetic induction, the IC having a function of controlling the transmission / reception of the information, and the IC An antenna coil connected to the antenna coil, a resonance coil not connected to any of the antenna coil and the IC, a capacitor connected to the resonance coil, and a magnetic body, the antenna coil, and the resonance The coil and the magnetic body are disposed in different layers, and the layer having the antenna coil is disposed between the layer having the resonance coil and the layer having the magnetic body, and Electromagnetically coupled to the resonant coil;
  Having an external terminal, having a function of transmitting and receiving information to and from an external device by contact with the external terminal,
  The non-contact communication medium, wherein the external terminal is disposed on a side opposite to a side where the layer having the antenna coil of the magnetic body is disposed. The contactless communication medium according to claim 5 or 6 , which has a SIM card function. Maximum dimension and minimum dimension of the outer shape of the resonant coil, in any one of claims 1-7, characterized in that 90% to 110% respectively of the maximum dimension and minimum dimension of the outer shape of each of the antenna coils The contactless communication medium as described. A non-contact communication medium having a multilayer structure and having a function of transmitting / receiving information to / from an external device using electromagnetic induction, the IC having a function of controlling the transmission / reception of the information, and the IC An antenna coil connected to the antenna coil, a resonance coil not connected to any of the antenna coil and the IC, a capacitor connected to the resonance coil, and a magnetic body , the antenna coil, and the resonance The coil and the magnetic body are disposed in different layers , respectively, and the maximum and minimum dimensions of the external shape of the resonance coil are 90% to 110% of the maximum and minimum dimensions of the external shape of the antenna coil, respectively. The antenna coil and the resonance coil are electromagnetically coupled ,
A contactless communication medium , wherein a hole is provided in the magnetic body, and the IC is disposed at the position of the hole in the layer having the magnetic body . A non-contact communication medium having a multilayer structure and having a function of transmitting / receiving information to / from an external device using electromagnetic induction, the IC having a function of controlling the transmission / reception of the information, and the IC An antenna coil connected to the antenna coil, a resonance coil not connected to any of the antenna coil and the IC, and a capacitor connected to the resonance coil. The antenna coil and the resonance coil are separately provided. The maximum and minimum dimensions of the outer shape of the resonance coil are 90% to 110% of the maximum and minimum dimensions of the antenna coil respectively, and the antenna coil and the resonance coil are Electromagnetically coupled,
The antenna coil and the resonance coil are formed on different conductor layers of a substrate having a multilayer conductor layer,
A first short-circuit electrode that short-circuits the start point and end point of the antenna coil and a second short-circuit electrode that short-circuits the start point and end point of the resonance coil are formed on the same conductor layer of the substrate having the multilayer conductor layer. noncontact communication medium, characterized in that it is formed. A resonance frequency of a resonance circuit including a capacitor connected to the antenna coil inside or outside the IC, the resonance circuit including the resonance coil and the capacitor connected to the resonance coil is contactless communication medium according to any one of claims 1 to 10, characterized in that lower than the resonance frequency of the resonance circuit constituted by an internal or external capacitor to the IC.

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