JP5116110B2 - Non-contact communication medium and method for manufacturing the same - Google Patents

Description

  The present invention relates to a non-contact communication medium including an IC chip having a non-contact communication function and a non-contact communication antenna including a winding coil, and a manufacturing method thereof.

  A non-contact communication medium is generally a technology for embedding an RFID (Radio Frequency Identification) module in which an IC chip having a non-contact communication function and an antenna are electrically connected and embedded in a sheet laminate made of resin sheets. It has been known. Typical contactless communication media include contactless IC cards and contactless IC tags. For example, Patent Document 1 discloses a method for manufacturing a non-contact IC card.

  Patent Document 1 discloses a method of manufacturing a non-contact IC card having a non-contact IC module having an annular antenna, in which spacers made of resin are arranged at predetermined positions inside and outside an area surrounded by the antenna in an annular shape. In addition, a resin layer is disposed on each of the upper layer and the lower layer and thermocompression bonded to form the intermediate laminate, and a resin is respectively applied to the upper layer and the lower layer of the intermediate laminate formed in the first thermocompression step. And a second thermocompression bonding step in which a pattern sheet made of is placed and thermocompression bonded. It is described that the spacer disposed in the region surrounded by the antenna in a ring shape is a resin having lower fluidity than the spacer disposed outside the region of the antenna.

JP 2002-74293 A

  In the non-contact communication medium, the RFID module is sandwiched between resin sheets made of materials such as PVC (polyvinyl chloride) and PET-G (amorphous polyethylene terephthalate copolymer), and is placed on both sides of the sandwiched resin sheet. An RFID module is embedded between resin sheets by pressing a hot plate, pressurizing and heating to obtain an integrated sheet laminate, and then a sheet is formed into a predetermined shape for each embedded RFID module. Some are manufactured by punching a laminate.

  An RFID module used for a non-contact communication medium includes a COB (Chip On Board) in which an IC chip is placed on a substrate provided with a wiring pattern and resin-sealed, and a copper having an insulating coating that causes adhesion by a solvent or heat. Some antennas are manufactured by winding wires and are electrically connected by soldering, welding, or the like, which are antennas made of air-core coils.

  A conventional non-contact communication medium and a manufacturing method thereof will be described with reference to the drawings.

  FIG. 5 is a diagram for explaining a conventional method of manufacturing a non-contact communication medium. Fig.5 (a) is a figure explaining the structure of a sheet | seat laminated body, and has shown the state before laminating | stacking.

  In the conventional method of manufacturing a non-contact communication medium, first, a copper wire having an insulating film that is made adhesive by a solvent or heat is wound to produce an air-core coil, and an antenna 93a, antenna 93b, antenna 93c, antenna A COB including an IC chip having a non-contact communication function is manufactured as COB 95a, COB 95b, COB 95c, and COB 95d.

  Next, the antenna 93a and the COB 95a, the antenna 93b and the COB 95b, the antenna 93c and the COB 95c, and the antenna 93d and the COB 95d are electrically joined to produce an RFID module, and then a resin sheet 96c and a resin sheet 96d And sandwiching the COB and the antenna between the resin sheets by pressing the hot plate against both sides of the sandwiched resin sheet, pressurizing and heating the integrated sheet laminate 991 Make it.

  FIG. 5B is a diagram for explaining the laminated sheet after lamination. In the sheet laminate 991, antennas 93a and COB 95a, antennas 93b and COB 95b, antennas 93c and COB 95c, and antennas 93d and COB 95d are embedded.

  FIG. 6 is a diagram for explaining a conventional non-contact communication medium and a manufacturing method thereof. Fig.6 (a) is a figure which shows the state immediately after stamping into a predetermined shape with respect to a sheet | seat laminated body.

  For the sheet laminate 991 of FIG. 5 already described above, a non-contact communication medium 91a including an antenna 93a and a COB 95a, and a non-contact communication medium 91b including an antenna 93b and a COB 95b are used. The non-contact communication medium 91c including the antenna 93c and the COB 95c and the non-contact communication medium 91d including the antenna 93d and the COB 95d are punched into respective predetermined shapes, and then separated into individual pieces, thereby the non-contact communication medium 91a and the non-contact communication The medium 91b, the non-contact communication medium 91c, and the non-contact communication medium 91d are produced.

  FIG. 6B is a diagram for explaining the non-contact communication medium individually separated from the sheet laminate. An antenna 93a and a COB 95a are embedded in the non-contact communication medium 91a, an antenna 93b and a COB 95b are embedded in the non-contact communication medium 91b, and an antenna 93c and a COB 95c are embedded in the non-contact communication medium 91c. An antenna 93d and a COB 95d are embedded in the communication medium 91d.

  FIG.6 (c) is sectional drawing along the BB line of FIG.6 (b), and has shown the cross section of the non-contact communication medium 91b. That is, the cross section of the conventional non-contact communication medium is shown. The antenna unit 933a and the antenna unit 933b show a cross section of the antenna 93b embedded in the non-contact communication medium 91b.

  In the non-contact communication medium 91b manufactured by the conventional method of manufacturing a non-contact communication medium, when the thickness of the antenna to be embedded is thicker than COB, the pressure at the start of lamination is concentrated on the antenna. There is a case where the copper wire crushing 77 occurs in the wire, the insulation film of the copper wire is blurred, and the copper wires are short-circuited to cause a product defect.

  In addition, since the antenna is subjected to pressure during lamination and receives heat from the hot plate, the adhesive force of the insulating coating that bonds the copper wires of the antenna is reduced, and the copper wires are easily separated. Further, the resin of the resin sheet is softened by the heat from the hot plate, and flows into the vicinity of the antenna portion 933a due to the pressure at the time of lamination, and the antenna unwinding 88a and unwinding 88b may occur, and the antenna is disconnected. As a result, there is a problem that the product becomes defective.

  However, for example, in the method of manufacturing a non-contact IC card described in Patent Document 1, a spacer made of resin with low fluidity provided at a predetermined position near the antenna is provided for the purpose of obtaining flatness of the card surface. There is no description and suggestion about unwinding of the antenna and copper wire crushing due to pressurization and heating at the time of lamination, and conventionally, the unrolling of the antenna and copper wire crushing due to pressurization and heating at the time of lamination do not occur, and the surface of the medium However, it has been difficult to obtain a flat non-contact communication medium.

  SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems, and provide a non-contact communication medium having a flat medium surface without unwinding of an antenna and crushing of a copper wire due to pressurization and heating during lamination, and a method for manufacturing the same. There is.

  The present invention relates to a thickness of an antenna made of an air-core coil made of a resin, which is made of a resin having a heat deformation temperature higher than that of a resin sheet used for lamination by 10 ° C. or more and lower than the lamination processing temperature An annular or polygonal ring-shaped pressure relaxation body having the above thickness is provided in a region surrounded by the antenna, that is, an air core region of the antenna, so that the pressure at the start of lamination is received by the pressure relaxation body, and the antenna Thus, it is possible to obtain a non-contact communication medium that does not cause unwinding of the antenna and crushing of the copper wire due to pressurization and heating during lamination.

  In particular, by using a resin having a thermal deformation temperature higher than the resin sheet used for lamination by 10 ° C. or more for the pressure relaxation body, the resin of the resin sheet to be laminated becomes gradually softened by the heat at the time of lamination. The pressure relief body keeps its shape until the pressure at the time of stacking is not concentrated on the antenna, and the pressure applied to the antenna is reduced by the pressure applied at the time of stacking. Can be reduced.

  Furthermore, by setting the thermal deformation temperature of the resin used for the pressure relaxation body to less than the lamination processing temperature, the pressure relaxation body heated to the lamination processing temperature becomes gradually softer, and in the vicinity of the pressure relaxation body at the pressure during lamination. The thickness of the resin sheet flowing into the resin can be balanced with the resin, and the surface of the non-contact communication medium can be flattened.

  In addition, the pressure relief body has an annular or polygonal ring shape and is provided in the air core region of the antenna, thereby reducing the amount of resin in the resin sheet flowing into the air core region of the antenna, The load such as pressure on the antenna due to the flow of resin on the sheet can be reduced, and the resin that forms the pressure relief heated to the laminating temperature can flow to the area surrounded by the annular or polygonal ring pressure relief. The load such as pressure on the antenna can be reduced.

  That is, according to the present invention, an RFID module formed by electrically joining an IC chip having a non-contact communication function and an antenna for non-contact communication including an air-core coil is sandwiched between resin sheets. A non-contact communication medium that is laminated and integrated by pressurizing and heating, and is made of a resin having a thermal deformation temperature that is 10 ° C. higher than the thermal deformation temperature of the resin sheet and lower than the lamination processing temperature, A non-contact communication medium characterized in that a pressure relaxation body having an annular shape or a polygonal ring shape having a thickness equal to or greater than the thickness of the antenna is provided in the air core region of the antenna.

  Further, according to the present invention, an IC chip having a non-contact type communication function and an antenna for non-contact communication composed of an air-core coil are sandwiched between resin sheets, pressed and heated to be laminated and laminated. A method for manufacturing an integrated non-contact communication medium, wherein the IC chip and the antenna are electrically connected to produce an RFID module, which is 10 ° C. higher than the thermal deformation temperature of the resin sheet and is laminated An annular or polygonal ring-shaped pressure relaxation body made of a resin having a thermal deformation temperature lower than the processing temperature and having a thickness equal to or greater than the thickness of the antenna, and then the pressure relaxation body in the air core region of the antenna Producing a plurality of the RFID modules arranged, sandwiching between the resin sheets, pressing a hot plate on both sides of the sandwiched resin sheet, pressurizing and By heating, the RFID module is embedded between the resin sheets to produce a sheet laminate, and the sheet laminate is punched for each predetermined shape including one RFID module, A method of manufacturing a non-contact communication medium, characterized by producing a non-contact communication medium, is obtained.

  According to the present invention, an antenna comprising an air-core coil made of a resin, which is made of a resin having a heat distortion temperature higher than that of a resin sheet used for lamination by 10 ° C. or more and lower than a lamination processing temperature. By providing an annular or polygonal ring-shaped pressure relief body in the air core area of the antenna, the pressure at the start of lamination is received by the pressure relief body to reduce the pressure applied to the antenna. In addition, an antenna unwinding and copper wire crushing due to pressurization and heating at the time of lamination do not occur, and a non-contact communication medium having a flat medium surface and a manufacturing method thereof can be obtained.

The figure explaining the non-contact communication medium of this invention. The exploded view explaining the structure of the non-contact communication medium of this invention. The figure explaining the manufacturing method of the non-contact communication medium of this invention, Fig.3 (a) is a figure explaining the structure of a sheet | seat laminated body, FIG.3 (b) is a figure explaining the sheet | seat laminated body after lamination | stacking. FIG. 4A is a diagram for explaining a non-contact communication medium and a manufacturing method thereof according to the present invention, FIG. 4A is a diagram showing a state immediately after being punched into a predetermined shape with respect to a sheet laminate, and FIG. The figure explaining the non-contact communication medium isolate | separated separately, FIG.4 (c) is sectional drawing along the AA of FIG.4 (b). The figure explaining the manufacturing method of the conventional non-contact communication medium, FIG. 5 (a) is a figure explaining the structure of a sheet | seat laminated body, FIG.5 (b) is a figure explaining the sheet | seat laminated body after lamination | stacking. FIG. 6A is a diagram illustrating a conventional non-contact communication medium and a manufacturing method thereof, FIG. 6A is a diagram illustrating a state immediately after punching into a predetermined shape with respect to the sheet laminate, and FIG. FIG. 6C is a cross-sectional view taken along line B-B in FIG. 6B.

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

  First, the non-contact communication medium of the present invention will be described. FIG. 1 is a diagram for explaining a non-contact communication medium according to the present invention. The non-contact communication medium 1 includes an RFID module 2 formed by electrically joining a COB 5 and an antenna 3, and a pressure relief body 4 arranged in the air core region of the antenna 3 and a resin sheet 6a and a resin The sheet 6b is sandwiched, stacked, and embedded.

  FIG. 2 is an exploded view for explaining the configuration of the non-contact communication medium of the present invention. The non-contact communication medium includes an RFID module 2 including a COB 5 and an antenna 3, a pressure relaxation body 4, a resin sheet 6a, and a resin sheet 6b.

  The COB 5 may be a COB having an IC chip having a communication function capable of non-contact communication using a non-contact communication antenna formed of a winding coil, and a commercially available non-contact communication COB may be used. It is preferable to select appropriately.

  The antenna 3 only needs to be a wound coil using a copper wire having an insulating coating that is adhesively bonded by a solvent or heat, and the wire diameter of the copper wire and the outer dimension of the wound coil are the frequency and communication for performing non-contact communication. It is preferable to select appropriately according to the distance.

  The resin sheet 6a and the resin sheet 6b may be any sheet made of a resin that can be laminated by pressurization and heating, and a PET-G sheet, a PVC sheet, or the like can be used, and is preferably selected as appropriate.

  The material of the pressure relaxation body 4 is a resin having a heat deformation temperature higher by 10 ° C. or more than the resin sheet 6a and the resin sheet 6b, and any resin having a heat deformation temperature lower than the lamination processing temperature. The resin can be appropriately selected. In consideration of the mechanical strength of the non-contact communication medium, the pressure relaxation body 4 is desirably a resin that can be laminated on the resin sheet 6a and the resin sheet 6b constituting the non-contact communication medium. It is preferable to use the same or similar resin as the sheet 6a and the resin sheet 6b.

  The thickness of the pressure relaxation body 4 should just be more than the thickness of the antenna to be used, and it is preferable to select suitably according to the thickness of the antenna to be used.

  The shape of the pressure relaxation body 4 may be an annular shape or a polygonal ring shape as long as it can be installed in the air core region of the antenna, and is preferably selected appropriately according to the shape of the antenna. In consideration of workability, an annular shape is particularly desirable.

  Next, the manufacturing method of the non-contact communication medium of this invention is demonstrated.

  FIG. 3 is a diagram for explaining a method of manufacturing a non-contact communication medium according to the present invention. Fig.3 (a) is a figure explaining the structure of a sheet | seat laminated body, and has shown the state before laminating | stacking.

  In the method for manufacturing a non-contact communication medium of the present invention, first, an air core coil is manufactured by winding a copper wire having an insulating coating that is adhesively generated by a solvent or heat, and an antenna 3a, an antenna 3b, an antenna 3c, A COB including an IC chip having a non-contact communication function is manufactured as the antenna 3d, and the COB 5a, COB 5b, COB 5c, and COB 5d are formed. Each of these is electrically joined to produce an RFID module.

  Next, the thickness of the antenna 3a, the antenna 3b, the antenna 3c, and the antenna 3d is equal to or greater than the thickness, and the thermal deformation temperature is higher by 10 ° C. or more than the resin sheet 6c and the resin sheet 6d, A sheet made of a resin having a heat deformation temperature of less than that is processed into an annular shape having a size corresponding to the air core region of the antenna 3a, the antenna 3b, the antenna 3c, and the antenna 3d, and the pressure relaxation body 4a and the pressure relaxation body 4b. The pressure relaxation body 4c and the pressure relaxation body 4d are produced.

  Next, the antenna 3a and the COB 5a, the antenna 3b and the COB 5b, the antenna 3c and the COB 5c, and the antenna 3d and the COB 5d are respectively arranged on the resin sheet 6d, and the pressure relaxing body 4a is arranged inside the antenna 3a. The pressure relief body 4b is arranged inside the antenna 3c, the pressure relief body 4c is arranged inside the antenna 3c, the pressure relief body 4d is arranged inside the antenna 3d, and then the resin sheet 6c is stacked and sandwiched A hot plate is pressed against both sides of the sheet and pressed, and heat is transferred from the hot plate to a resin sheet to heat and laminate to produce the sheet laminate 11.

  FIG.3 (b) is a figure explaining the sheet | seat laminated body after lamination | stacking. In the sheet laminate 11, the antenna 3a, the COB 5a, the pressure relaxation body 4a, the antenna 3b, the COB 5b, the pressure relaxation body 4b, the antenna 3c, the COB 5c, the pressure relaxation body 4c, and the antenna 3d, the COB 5d, and the pressure relaxation body 4d are embedded.

  FIG. 4 is a diagram for explaining the non-contact communication medium and the manufacturing method thereof according to the present invention. FIG. 4A is a diagram showing a state immediately after punching into a predetermined shape with respect to the sheet laminate.

  For the sheet laminate 11 of FIG. 3 already described above, using a punching machine (not shown), the non-contact communication medium 1a including the antenna 3a, the COB 5a, and the pressure relaxation body 4a, the antenna 3b, the COB 5b, and the pressure relaxation A non-contact communication medium 1b including the body 4b, a non-contact communication medium 1c including the antenna 3c, the COB 5c and the pressure relaxation body 4c, and a non-contact communication medium 1d including the antenna 3d, the COB 5d and the pressure relaxation body 4d. After punching into a shape, they are individually separated to produce a non-contact communication medium 1a, a non-contact communication medium 1b, a non-contact communication medium 1c, and a non-contact communication medium 1d.

FIG. 4B is a diagram for explaining the non-contact communication medium individually separated from the sheet laminate.
The antenna 3a, the COB 5a, and the pressure relaxation body 4a are embedded in the non-contact communication medium 1a, the antenna 3b, the COB 5b, and the pressure relaxation body 4b are embedded in the non-contact communication medium 1b, and the antenna 3c, the COB 5c, and the pressure relaxation body 4c are non-contact. The antenna 3d, the COB 5d, and the pressure relaxation body 4d are embedded in the non-contact communication medium 1d.

  FIG.4 (c) is sectional drawing along the AA of FIG.4 (b), and has shown the cross section of the non-contact communication medium 1b. That is, the cross section of the non-contact communication medium of the present invention is shown. The antenna portion 33a and the antenna portion 33b show a cross section of the antenna 3b embedded in the non-contact communication medium 1b, and the pressure relaxation body portion 44a and the pressure relaxation body portion 44b are a pressure relaxation body embedded in the non-contact communication medium 1b. The cross section of 4b is shown. As shown in FIG. 4C, a non-contact communication medium having a flat surface without unwinding of the antenna and crushing of the copper wire can be manufactured.

  Examples of the present invention will be specifically described below.

  First, COB, an antenna, and a resin-made sheet that are commonly used in the examples and comparative examples of the present invention described below will be described.

  As the COB, a commercially available COB for non-contact communication having a thickness of 0.30 mm and a communication frequency of 13.56 MHz, in which a metal substrate is sealed with a resin, was used.

  In addition, a copper wire with a thermal reaction type self-bonding insulating coating having a wire diameter of 100 μm is wound on the antenna by an aligned winding on a rod-shaped winding die having a diameter of 40 mm, and an air core having a thickness of 0.30 mm is formed. A wound coil was prepared and used, and the RFID module was manufactured by soldering the COB and the antenna.

  Further, as the resin sheet, a PET-G sheet having a heat deformation temperature of 50 ° C., a thickness of 0.25 mm, a width dimension of 210 mm, and a length dimension of 290 mm was used.

(Examples 1 to 9)
The pressure relaxation body used in the non-contact communication medium according to Examples 1 to 3 of the present invention is based on a PET-G sheet similar to the PET-G sheet used for lamination, has a heat distortion temperature of 60 ° C., and an antenna. A PET-G sheet having a thickness of 0.30 mm, which is the same as the thickness of No. 1, was cut into an annular shape having an outer diameter of 40 mm and having an inner diameter shown in Examples 1 to 3 in Table 1.

  Subsequently, the pressure relaxation body used in the non-contact communication media according to Examples 4 to 6 of the present invention is based on a PET-G sheet similar to the PET-G sheet used for lamination, and has a heat deformation temperature of 70 ° C. Then, a PET-G sheet having a thickness of 0.30 mm, which is the same as the thickness of the antenna, was cut into an annular shape having an outer dimension of 40 mm and having inner diameter dimensions shown in Examples 4 to 6 in Table 2.

  Furthermore, the pressure relaxation body used in the non-contact communication media according to Examples 7 to 9 of the present invention is based on a PET-G sheet similar to the PET-G sheet used for lamination, and has a heat deformation temperature of 70 ° C. A PET-G sheet 0.05 mm thicker than the thickness of the antenna and having a thickness of 0.35 mm was cut into an annular shape having an outer dimension of 40 mm and the inner diameter shown in Examples 7 to 9 in Table 3.

  Subsequently, four pre-manufactured RFID modules are arranged on a PET-G sheet having a thermal deformation temperature of 50 ° C., which is a resin sheet, and a pressure relaxation body is arranged in the air core region of each RFID module. After that, a PET-G sheet having a thermal deformation temperature of 50 ° C. forming a resin sheet is stacked and sandwiched, and a hot plate is pressed on both sides of the sandwiched resin sheet to pressurize the lamination pressure at 5 MPa, Lamination processing temperature was set to 120 ° C., heating through a hot plate, and lamination was performed to produce a sheet laminate. Note that the four pressure relief bodies arranged in the air core region of the antennas of the four RFID modules embedded in the sheet laminate were the pressure relief bodies of the same example, and the sheet laminate was produced for each example. In addition, the thermal deformation temperature of the pressure relaxation bodies of Examples 1 to 9 of the present invention is less than the above laminating temperature.

  Next, using a punching machine, for each embedded RFID module, a sheet laminate is punched in a shape having a lengthwise dimension of 60 mm and a widthwise dimension of 60 mm, according to Examples 1 to 9 of the present invention. A non-contact communication medium was produced.

  In Examples 1 to 9 of the present invention, 1000 non-contact communication media were produced for each Example, and the unwinding of the antenna and the collapse of the copper wire were inspected using an X-ray transmission analyzer. Furthermore, the presence or absence of irregularities on the medium surface was confirmed by visual inspection. The inspection results of the non-contact communication media of Examples 1 to 9 are shown in Tables 1 to 3.

  As shown in Tables 1 to 3, the non-contact communication media according to Examples 1 to 9 did not cause unwinding of the antenna and crushing of the copper wire, and had no irregularities on the surface of the medium. Therefore, an annular pressure relief body made of a resin having a heat deformation temperature that is higher than the heat deformation temperature of the resin sheet by 10 ° C. or more and less than the lamination processing temperature and that has a thickness greater than or equal to the antenna thickness is By providing it in the air core region, an antenna unwinding and copper wire crushing due to pressurization and heating during lamination did not occur, and a non-contact communication medium with a flat medium surface was obtained.

(Comparative Examples 1 to 6)
The pressure relaxation body used in the non-contact communication medium of Comparative Example 1 is based on a PET-G sheet similar to the PET-G sheet used for lamination, has a heat deformation temperature of 60 ° C., and has the same thickness as that of the antenna. A PET-G sheet having a thickness of 30 mm was cut into a circle having a diameter of 40 mm. Comparative Example 1 is a comparative example in which the shape of the pressure relaxation body is not an annular shape but a circular shape with respect to the pressure relaxation bodies of Examples 1 to 3 of the present invention.

  Subsequently, the pressure relaxation body used in the non-contact communication medium of Comparative Example 2 is based on a PET-G sheet similar to the PET-G sheet used for lamination, has a heat deformation temperature of 70 ° C., and the thickness of the antenna. A PET-G sheet having the same thickness of 0.30 mm was cut into a circle having a diameter of 40 mm. Comparative Example 2 is a comparative example in which the shape of the pressure relaxation body is not an annular shape but a circular shape with respect to the pressure relaxation bodies of Examples 4 to 6 of the present invention.

  Furthermore, the pressure relaxation body used in the non-contact communication medium of Comparative Example 3 is based on a PET-G sheet similar to the PET-G sheet used for lamination, has a heat deformation temperature of 70 ° C., and is 0 from the thickness of the antenna. A PET-G sheet having a thickness of 0.05 mm and a thickness of 0.35 mm was cut into a circle having a diameter of 40 mm. Comparative Example 3 is a comparative example in which the shape of the pressure relaxation body is not an annular shape but a circular shape with respect to the pressure relaxation bodies of Examples 7 to 9 of the present invention.

  Further, the pressure relaxation body used in the non-contact communication medium of Comparative Example 4 is the same resin as the PET-G sheet used for lamination, has a thermal deformation temperature of 50 ° C., and is 0.05 mm thicker than the thickness of the antenna. A PET-G sheet having a thickness of .35 mm was cut into an annular shape having an outer dimension of 40 mm and an inner diameter dimension shown in Comparative Example 4 of Table 4. The comparative example 4 is a comparative example in which the thermal deformation temperature of the resin constituting the pressure relaxation body is equal to the thermal deformation temperature of the resin sheet with respect to the pressure relaxation body of the eighth embodiment of the present invention.

  Furthermore, the pressure relaxation body used in the non-contact communication medium of Comparative Example 5 is based on a PET-G sheet similar to the PET-G sheet used for lamination, has a heat deformation temperature of 70 ° C., and is 0 from the thickness of the antenna. A PET-G sheet having a thickness of 0.05 mm and a thickness of 0.25 mm was cut into an annular shape having an outer dimension of 40 mm and an inner diameter dimension shown in Comparative Example 5 of Table 4. Comparative Example 5 is a comparative example in which the thickness of the pressure relaxation body is less than the thickness of the antenna with respect to the pressure relaxation body of Example 8 of the present invention.

  Furthermore, the pressure relaxation body used in the non-contact communication medium of Comparative Example 6 has a thermal deformation temperature of 135 ° C., a polycarbonate sheet having a thickness of 0.35 mm, 0.05 mm thicker than the thickness of the antenna, and an outer dimension of 40 mm. Thus, it was cut into an annular shape having an inner diameter shown in Comparative Example 6 in Table 4. Comparative Example 6 is a comparative example in which the thermal deformation temperature of the resin constituting the pressure relaxation body is set to be equal to or higher than the lamination processing temperature with respect to the pressure relaxation body of Example 8 of the present invention.

  Subsequently, four pre-manufactured RFID modules are arranged on a PET-G sheet having a thermal deformation temperature of 50 ° C., which is a resin sheet, and a pressure relaxation body is arranged in the air core region of each RFID module. After that, a PET-G sheet having a thermal deformation temperature of 50 ° C. forming a resin sheet is stacked and sandwiched, and a hot plate is pressed on both sides of the sandwiched resin sheet to pressurize the lamination pressure at 5 MPa, Lamination processing temperature was set to 120 ° C., heating through a hot plate, and lamination was performed to produce a sheet laminate. Note that the four pressure relaxation bodies arranged in the air core region of the antennas of the four RFID modules embedded in the sheet laminate were the same pressure relief bodies of the comparative example, and a sheet laminate was produced for each comparative example.

  Next, for each embedded RFID module using a punching machine, the sheet laminate is punched in a shape having a length dimension of 60 mm and a width dimension of 60 mm. Was made.

  In Comparative Examples 1 to 6, 1000 non-contact communication media were produced for each example, and the unwinding of the antenna and the collapse of the copper wire were inspected using an X-ray transmission analyzer. Furthermore, the presence or absence of irregularities on the medium surface was confirmed by visual inspection. The inspection results of the non-contact communication media of Comparative Examples 1 to 6 are shown in Tables 1 to 4.

  As shown in Tables 1 to 4, in the contactless communication media of Comparative Examples 1 to 6, unwinding of the antenna and crushing of the copper wire occurred. Furthermore, irregularities were generated on the surface of the medium. Therefore, when the thermal deformation temperature of the resin constituting the pressure relaxation body is not higher by 10 ° C. or more than the thermal deformation temperature of the resin sheet, or the thermal deformation temperature of the resin constituting the pressure relaxation body is equal to or higher than the lamination processing temperature. In some cases, when the thickness of the pressure relaxation body is less than the thickness of the antenna, or when the shape of the pressure relaxation body is circular, the pressure relaxation body may be added to the antenna even if it is provided in the air core region. Unwinding of the antenna and crushing of the copper wire due to pressure and heating did not occur, and a non-contact communication medium with a flat medium surface could not be obtained.

  Therefore, as described above, according to the non-contact communication medium of the present invention and the manufacturing method thereof, unwinding of the antenna and crushing of the copper wire due to pressurization and heating at the time of stacking, which could not be obtained conventionally, do not occur, A contactless communication medium having a flat medium surface could be obtained.

  The embodiment of the present invention has been described above with reference to the drawings. However, the present invention is not limited to this embodiment, and the present invention can be changed even if there are changes in members and configurations without departing from the spirit of the present invention. include. For example, in the above-described embodiment, a non-contact communication medium and a method for manufacturing the same are described using an annular pressure relief body. However, such a structure is not necessarily required. Even if the configuration using the body is adopted, the embodiment of the present invention is similarly formed. That is, it goes without saying that the present invention also includes various modifications and corrections that would be obvious to those skilled in the art.

1, 1a, 1b, 1c, 1d, 91a, 91b, 91c, 91d Non-contact communication medium 2 RFID module 3, 3a, 3b, 3c, 3d, 93a, 93b, 93c, 93d Antenna 4, 4a, 4b, 4c, 4d Pressure relief body 5, 5a, 5b, 5c, 5d, 95a, 95b, 95c, 95d COB
6a, 6b, 6c, 6d Resin-made sheet 11 Sheet laminated body 33a, 33b Antenna portion 44a, 44b Pressure relaxation body portion 77 Copper wire collapse 88a, 88b Unwinding 991 Sheet laminated body 933a, 933b Antenna portion

Claims (2)

  An RFID module formed by electrically joining an IC chip having a non-contact type communication function and an antenna for non-contact communication consisting of an air-core coil is sandwiched between resin sheets, stacked by pressing and heating. An integrated non-contact communication medium, which is made of a resin having a heat deformation temperature that is higher by 10 ° C. or more than the heat deformation temperature of the resin sheet and less than a lamination processing temperature, and has a thickness that is equal to or greater than the thickness of the antenna. A non-contact communication medium, wherein a pressure relaxation body having an annular shape or a polygonal ring shape is provided in an air core region of the antenna.   Non-contact communication medium in which an IC chip having a non-contact communication function and an antenna for non-contact communication consisting of an air-core coil are sandwiched between resin sheets, and are laminated and integrated by pressing and heating. In this manufacturing method, the IC chip and the antenna are electrically connected to produce an RFID module, and the thermal deformation temperature is 10 ° C. or more higher than the thermal deformation temperature of the resin sheet and lower than the lamination processing temperature. A plurality of the RFID modules in which the pressure relief body is disposed in the air core region of the antenna after the annular or polygonal ring-shaped pressure relief body is formed. While producing, sandwiching with the resin sheet, pressing the hot plate on both sides of the sandwiched resin sheet, by pressing and heating, The RFID module is embedded between the resin sheets to produce a sheet laminate, and the sheet laminate is punched into a predetermined shape including one RFID module, and the non-contact communication medium is formed. A method of manufacturing a non-contact communication medium, characterized by comprising:

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