JP2017091152A - Antenna sheet, non-contact information recording medium, and method for manufacturing non-contact information recording medium - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a non-contact information medium having a capacitor formed thereon by an antenna and a circuit wiring which facilitates adjustment of an electrostatic capacity and can efficiently perform trimming that is an adjustment work.SOLUTION: There is provided an antenna sheet 10 which has an antenna 6 where a conductive wire coated with an insulative coating film is formed into a coil shape and a capacitor formed of a conductive wire coated with an insulative coating film parallel to the antenna are connected to an electrode of an IC module 1 arranged at a predetermined position on a thermoplastic resin sheet, where the antenna and the capacitor connected to the electrode of the IC module are partially pressed in the thermoplastic resin sheet, and the capacitor is a capacitor that is formed of the conductive wire coated with the insulative coating film and of which an electrostatic capacity can be adjusted.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a non-contact information recording medium capable of information communication without contact. Furthermore, the present invention relates to a non-contact information recording medium whose communication characteristics can be adjusted, an antenna sheet used therefor, and a method for manufacturing the non-contact information recording medium.

With the penetration of NFC (Near Field Communication), an international standard for short-range wireless communication technology with a communication distance limited to about 10 cm, non-contact information recording media represented by non-contact IC cards have come to be used frequently. ing.
The non-contact information recording medium communicates with an antenna for exchanging information with a reader / writer which is an external communication device for writing information or reading recorded information, and an information processing function connected thereto. An IC chip having a function is provided.

  Reader / writer antennas having various sizes and shapes are used. When a problem related to communication with a non-contact information recording medium occurs, the problem is often solved on the non-contact information recording medium side. For this reason, a communication standard with a narrow allowable range is set for the non-contact information recording medium, which is a big problem in design and development.

  When designing and developing a non-contact information recording medium, there are variations in the characteristics of the IC chip used and the material characteristics for forming the antenna. Tuning by fine adjustment (trimming) of communication characteristics is required for each recording medium.

  As a component of the non-contact information recording medium, a capacitor is required in addition to the IC chip and the antenna. This is an indispensable element as a component of the tuning circuit for maximizing the frequency signal received by the antenna. Specifically, the signal is maximized by matching the resonance frequency determined by the inductance of the antenna and the capacitance of the capacitor with the frequency of the signal. For this reason, a capacitor, which is an individual element having a suitable capacitance, is used. However, a thin non-contact information recording medium such as a non-contact IC card has a problem that it is too thick.

  As a technique for solving the problem, for example, Patent Documents 1 to 3 disclose a technique in which a capacitor is formed only by a conducting wire such as an antenna or circuit wiring without using an individual element. While these technologies do not require special processes and have the advantage of low material costs, it is difficult to make the conductors adjacent to each other at equal intervals, resulting in large variations in characteristics such as capacitance, which are not stable. There is.

  Patent Document 4 discloses a technique for forming a capacitor by embedding a conductive wire with an insulating film in a conductive layer as a method of forming a capacitor only by a conductive wire. While this technology has the advantage that the winding antenna manufacturing process is less burdensome and the characteristic variation such as capacitance is small, the conductive layer needs to be as thick as the conducting wire, and the appearance of the non-contact information medium can be reduced. There is a problem that hurts. In addition, there is a technical difficulty of embedding the conductive wire with an insulating film in the conductive layer, and there is a problem that the embedded conductive wire is peeled off.

  In addition, these techniques have a problem in that it is difficult to finely adjust the capacitance of the capacitor, so that it is difficult to trim the non-contact information recording medium.

Japanese Patent No. 4615695 Japanese Patent No. 3611793 JP 2014-229204 A Japanese Patent No. 3979178

  In view of the above problems, the present invention can easily adjust the capacitance of a non-contact information medium in which a capacitor is formed by an antenna or circuit wiring, and can efficiently perform trimming, which is an adjustment operation. It is an object to provide a simple non-contact information recording medium.

As means for solving the above-mentioned problems, the invention according to claim 1 of the present invention is a coil-shaped conductor wire coated with an insulating film on the electrode of an IC module arranged at a predetermined position on a thermoplastic resin sheet. In the antenna sheet formed by connecting a capacitor made of a conductive wire coated with an insulating film in parallel to the antenna formed in the antenna,
The antenna and the capacitor connected to the electrode of the IC module are partly pressed into the thermoplastic resin sheet,
The capacitor is an antenna sheet characterized in that it is a capacitor capable of adjusting the electrostatic capacitance made of a conductive wire coated with an insulating film.

  According to the second aspect of the present invention, the capacitor capable of adjusting the capacitance is a series including a plurality of parallel lines equidistantly spaced in a direction intersecting the extending direction by repeatedly folding back in a zigzag shape. The antenna according to claim 1, comprising a conductive wire having a pattern and a conductive wire coated with an insulating film formed on the upper side or the lower side of the series of patterns so as to intersect the pattern. It is a sheet.

  The invention according to claim 3 is a non-contact information recording medium produced by using the antenna sheet according to claim 1 or 2, wherein the antenna sheet has thermoplasticity on the surface on which the IC module is disposed. A non-contact information recording medium comprising a laminate of resin sheets.

  According to a fourth aspect of the present invention, there is provided a non-contact information recording medium manufactured using the antenna sheet according to the first or second aspect, wherein a paper is placed on a surface of the antenna sheet on which the IC module is disposed. Alternatively, the non-contact information recording medium is formed by adhering a cloth or a combination thereof.

The invention according to claim 5 is a method for manufacturing a non-contact information recording medium according to claim 3,
Placing the IC module on the thermoplastic resin sheet;
A step of hot-pressing the IC module, the antenna and the capacitor into the thermoplastic resin sheet to produce an antenna sheet;
Connecting the antenna and the capacitor to the IC module;
A step of laminating a thermoplastic resin sheet on the surface of the antenna sheet on which the IC module is disposed, and then heat-pressing the antenna sheet and the thermoplastic resin sheet; and
A step of adjusting electrostatic capacity by breaking a folded portion of a conductive wire consisting of a series of patterns including a plurality of parallel lines at equal intervals in a direction intersecting the extending direction by repeatedly folding back and forth in a zigzag shape. And a method for manufacturing a non-contact information recording medium.

The invention according to claim 6 is a method for producing a non-contact information recording medium according to claim 4,
Placing the IC module on the thermoplastic resin sheet;
A step of hot-pressing the IC module, the antenna and the capacitor into the thermoplastic resin sheet to produce an antenna sheet;
Connecting the antenna and the capacitor to the IC module;
Adhering paper or cloth or a combination thereof to the antenna sheet using an adhesive on the surface of the antenna sheet on which the IC module is disposed;
A step of adjusting electrostatic capacity by breaking a folded portion of a conductive wire consisting of a series of patterns including a plurality of parallel lines at equal intervals in a direction intersecting the extending direction by repeatedly folding back and forth in a zigzag shape. And a method for manufacturing a non-contact information recording medium.

  According to the antenna sheet of the present invention, a lead wire coated with an insulating film made up of a plurality of parallel patterns of equal intervals in a direction orthogonal to the extending direction by repeatedly folding back in a zigzag manner, and an antenna Capacitor forming portion comprising a conductive wire that is connected to the other electrode of the IC module that is connected to the upper surface or the lower side of the series of patterns and that is covered with an insulating film formed to intersect the pattern A non-contact information recording medium capable of adjusting the electrostatic capacity can be provided by breaking the folded portion of the conducting wire that has been repeatedly folded in a zigzag manner at the capacitor forming portion. Further, according to the method for manufacturing a non-contact information recording medium of the present invention, it is possible to provide a non-contact information recording medium capable of easily adjusting the capacitance for the same reason as described above.

It is explanatory drawing which shows an example of the antenna sheet | seat of this invention, (a) is a top view, (b) is an enlarged view of the capacitor | condenser formation part of (a), (c) is a cross section of the capacitor | condenser formation part of (a). Figure. It is one example which measured the adjustment capability of the electrostatic capacitance of the antenna sheet of the present invention, (a) is a top view which shows the formation state of a zigzag conducting wire and an upper conducting wire, and (b) covers a zigzag folded portion. It is the graph which plotted the value of the electrostatic capacity of the capacitor formation part measured when fracture | rupturing the part of 1 to 21 and adjusting the electrostatic capacity (trimming). It is one example which measured the adjustment capability of the electrostatic capacitance of the antenna sheet of the present invention, (a) is a top view which shows the formation state of a zigzag conducting wire and an upper conducting wire, and (b) covers a zigzag folded portion. It is the graph which plotted the value of the electrostatic capacity of the capacitor formation part measured when fracture | rupturing the part of 1 to 21 and adjusting the electrostatic capacity (trimming). It is sectional drawing which showed the example of a structure of the ear | edge contact information recording medium of this invention, Comprising: (a) The state which laminated | stacked the resin sheet on the front and back of the antenna sheet of this invention, (b) is further protected on the surface of a resin sheet The state in which the layer is formed is shown. It is explanatory drawing which shows the example which improved the position of the zigzag return part of the zigzag conducting wire of the capacitor | condenser formation part used with the antenna sheet | seat of this invention.

<Antenna sheet>
The antenna sheet of the present invention will be described.
The antenna sheet of the present invention includes an antenna in which a conductive wire coated with an insulating film is formed in a coil shape on an electrode of an IC module arranged at a predetermined position on a thermoplastic resin sheet, and an insulating film in parallel with the antenna. An antenna sheet to which a capacitor made of a conductive wire coated with is connected. A part of the antenna and the capacitor connected to the electrode of the IC module is press-fitted into a thermoplastic resin sheet using a means such as a hot press. The capacitor is a capacitor capable of adjusting the electrostatic capacitance made of a conductive wire coated with an insulating film.

  Further, the capacitor capable of adjusting the electrostatic capacitance is repeatedly folded back and forth in a zigzag shape, thereby conducting a wire made of a series of patterns including a plurality of parallel lines at equal intervals in the direction intersecting the extending direction; It consists of a conducting wire coated on the upper side or lower side of a series of patterns with an insulating film formed so as to intersect the pattern.

Next, the antenna sheet of the present invention will be described in detail with reference to FIG.
Fig.1 (a) shows the top view of one Embodiment of the antenna sheet | seat of this invention. In the antenna sheet 10 of the present invention, the IC module 1 is disposed at a predetermined position on the base material 7 made of a thermoplastic resin, and then the antenna 6 and the capacitor forming portion 2 are coated on the base material 7 with an insulating film. It is formed using a conducting wire. The antenna 6 and the capacitor forming portion 2 are formed in a state where a part of the conducting wire is press-fitted into the base material 7. As a means for press-fitting the antenna 6 and the capacitor forming portion 2 into the base material 7, the lead-wire is press-fitted while the base material 7 and the conductive wire are heated to a temperature equal to or higher than the softening point of the thermoplastic resin constituting the base material 7. A method of forming a desired pattern by moving the substrate while emitting a conducting wire from a tip of an ultrasonic horn called a sonotrode or a method of applying pressure in the direction to be used can be suitably used.

In this way, after the antenna 6 and the capacitor forming portion 2 are formed on the base material 7, the terminal of the antenna 6 and the terminal of the capacitor forming portion 2 are connected to the electrode of the IC module 1. As a means for connection, soldering or welding can be preferably used.
As described above, the antenna sheet of the present invention can be manufactured.

(Capacitor forming part)
The capacitor forming part 2 of the antenna sheet 10 thus manufactured will be described.
As shown in FIG. 1A, the capacitor forming unit 2 is connected in parallel to the antenna 6 with respect to the IC module 1.
As shown in FIG. 1B and FIG. 1C, the capacitor forming unit 2 includes a zigzag conducting wire 4 that is partially pressed into the base material 7 in the same manner as the antenna 6, and the zigzag conducting wire 4. An upper conductive wire 5 (see FIG. 1 (b)) or a lower conductive wire (not shown) formed in a shape that intersects or crosses the upper side or the lower side of a plurality of parallel arranged conductive wires; It is composed of

The zigzag conducting wire 4 refers to a conducting wire having a series of patterns including a plurality of parallel lines that are equally spaced in a direction intersecting the extending direction by repeatedly folding back in a zigzag shape.
The capacitor forming portion 2 is a portion for forming a capacitor formed by the zigzag conducting wire 4 and a conducting wire covered with an insulating film formed by intersecting the upper side or the lower side of the zigzag conducting wire 4.

  The capacitance of the capacitor forming portion 2 having such a configuration is determined by the length of the zigzag conducting wire 4 and, for example, the length of the upper conducting wire 5. Therefore, since the length of the zigzag conducting wire 4 is changed depending on the breaking position of the portion (zigzag folded portion 3) where the zigzag conducting wire 4 is folded back, the capacitance can be adjusted. Further, since the capacitance changes depending on the length of the upper conductor 5 crossing or orthogonal to the zigzag conductor 4, the capacitance of the capacitor unit 2 can be adjusted by adjusting the length of both of them. It is. Here, the case of the upper conductive wire 5 has been described, but the same applies to the case of the lower conductive wire.

When changing the length of the upper conductor 4 or the lower conductor, the zigzag conductor 4 has a long length that intersects or orthogonally crosses, for example, when the number of intersecting or orthogonally crossing is changed from one to two,
The capacitance changes greatly. On the other hand, when the breaking position of the zigzag folded portion 3 is changed at an adjacent position, the change is small in comparison with the former case. For this reason, for example, the adjustment of the electrostatic capacitance can be performed by adjusting the number of crossing or orthogonal crossing of the upper conductive wires 5, and the fine adjustment can be performed by changing the breaking position of the zigzag folded portion 3. it can.

<Non-contact information recording medium>
Next, an information recording medium 20 using the antenna sheet 10 of the present invention will be described.
As illustrated in FIG. 4A, the information recording medium 20 of the present invention is formed by punching a predetermined position of the zigzag folded portion 3 of the antenna sheet 10 of the present invention by a method such as punching or laser processing. It can be produced by laminating the resin sheet 8 on the front and back surfaces of the antenna sheet after the process of breaking the conductive wire at the site.

  Furthermore, as illustrated in FIG. 4B, it can be produced by laminating a protective layer 9 for preventing damage to the surface of the resin sheet 8 in FIG. Instead of the resin sheet 8, only the protective layer 9 may be laminated.

Next, examples relating to the production of the antenna sheet of the present invention will be described.
<Example 1>
In order to produce the antenna sheet of the present invention, the following members were prepared.
(1) Conductive wire coated with insulating film: fused magnet wire 2-LOCK
Y1CCAW diameter 0.1mm (manufactured by Tokyo Special Electric Cable Co., Ltd.)
(2) Base substrate 1: Special polyester resin sheet PG-WHI
Thickness 0.20mm (Mitsubishi Resin Co., Ltd.)
(3) Base substrate 2: Special polyester resin sheet PG-CHI (FG)
Thickness 0.10mm (Mitsubishi Resin Co., Ltd.)
(4) IC module: Mifare ultracontact chip card module, MOA4 package (manufactured by NXP semiconductors)

First, an IC module was placed at a predetermined position on the base substrate 1.
Next, an antenna as shown in FIG. 1B is formed on the base substrate 1 by using a device for embedding a conductive wire coated with an insulating film into a resin sheet of a conductive wire using an ultrasonic sonotrode. And a circuit including a capacitor forming portion was formed. That is, the zigzag conducting wire 4 having a total of 21 zigzag folded portions 3 and the upper conducting wire 5 formed in a direction orthogonal to the conducting wire of the zigzag conducting wire 4 are formed so as to cross twice twice. It was.

Next, the circuit terminals were electrically connected by soldering to the two electrodes of the IC module.
In this way, an IC module was mounted on the base substrate 1 and a circuit including an antenna and a capacitor forming portion was formed, and an article connected to the IC module was produced.

  The base substrate 2 is placed on the article so as to cover the IC module and the circuit, the base substrate 1 and the base substrate 2 are fused by a heating press, and then a cooling press is performed, whereby an antenna is obtained. Five sheets were produced.

  Next, the capacitance of the capacitor forming part is adjusted by selecting the zigzag folded part of the capacitor forming part and punching it with a punch by observing the produced antenna through the transmitted light. did.

With respect to the antenna sheet thus manufactured, the capacity adjustment ability of the capacitor forming portion was measured. Specifically, the antenna sheet in which the electrostatic capacity of the capacitor forming portion is adjusted by punching out the first to the second zigzag folded portions shown in FIG. 2A by punching in this order and disconnecting them at the portions. And the resonance frequency corresponding to the capacitance was measured. A graph plotting the measurement results is shown in FIG. Table 1 shows the measurement data. f0 (MHz) is the resonance frequency, RL (Return Loss) is the return loss, and the value of the signal reflection caused by impedance mismatch is expressed in dB (decibel). Note that No. 22 does not include the capacitance of the capacitor forming portion.

<Example 2>
Next, Example 2 will be described.
In Example 2, as shown in FIG. 1 (b), a conductive wire coated with an insulating film is formed on a base substrate 1 using a device for embedding a conductive wire in a resin sheet using ultrasonic sonotrode. The same circuit as the circuit including the antenna and the capacitor forming portion was formed. A zigzag conducting wire 4 having a total of 22 zigzag folded portions 3 and an upper conducting wire 5 formed in a direction orthogonal to the conducting wire of the zigzag conducting wire 4 are formed so as to intersect four times (two times) ( Except for FIG. 3A), the same procedure as in Example 1 was performed.

With respect to the antenna sheet thus manufactured, the ability to adjust the capacitance (corresponding to the resonance frequency) of the capacitor forming portion was measured. Specifically, the antenna sheet in which the electrostatic capacity of the capacitor forming portion is adjusted by punching out the first to the second zigzag folded portions shown in FIG. 2A by punching in this order and disconnecting them at the portions. The resonance frequency corresponding to the capacitance was measured. A graph plotting the measurement results is shown in FIG. The measurement data is shown in Table 2.

  Although the capacitor formation part of Example 1 and Example 2 is considered that the electrode area which contributes to forming the capacitor | condenser of the capacitor | condenser formation part of Example 2 in general is 2 times compared with that of Example 1. As shown in Tables 1 and 2, the measurement results of the resonance frequencies corresponding to those capacitances were consistent with those. That is, in the case of Example 1 in which the number of times the upper conductor 5 formed in the direction orthogonal to the conductor of the zigzag conductor 4 intersects is 2, the resonance frequency can be adjusted in increments of 0.033 MHz on average. The adjustment width is 0.74 MHz. On the other hand, in the case of Example 2 in which the number of crossings was four, the resonance frequency could be adjusted in increments of 0.064 MHz on average, and the adjustment range was 1.42 MHz. Therefore, if the number of times the upper conductor 5 formed in the direction orthogonal to the conductor of the zigzag conductor 4 intersects is increased, the adjustable width is widened and the adjustable resolution is lowered.

As described above, in the antenna sheet of the present invention, the number of times the upper conductor 5 formed in the direction orthogonal to the conductor of the zigzag conductor 4 of the capacitor forming portion intersects the zigzag conductor 4, and the zigzag folded portion is disconnected. By selecting the location to be adjusted, the capacitance of the capacitor forming portion can be adjusted, and thereby the resonance frequency of the antenna sheet can be adjusted.
Further, the configuration of the zigzag folded portion as shown in FIG. 5, that is, the zigzag folded portion is disposed at a position adjacent to every other zigzag folded portion and separated from the zigzag folded portion. In the case of disconnection due to, it is possible to eliminate the possibility of causing damage to the adjacent zigzag folded portion.

DESCRIPTION OF SYMBOLS 1 ... IC module 2 ... Capacitor formation part 3 ... Zigzag return part 4 ... Zigzag part conducting wire 5 ... Overhead conducting wire 6 ... Antenna 7 ... Base material 8 ... Resin Sheet 9 ... Protective layer 10 ... Antenna sheet 20 ... Information recording medium

Claims (6)

Connected to an antenna of an IC module placed in a predetermined position on a thermoplastic resin sheet with a coil formed of a conductive wire coated with an insulating film and a capacitor consisting of a conductive wire coated with the insulating film on the antenna In the antenna sheet,
The antenna and the capacitor connected to the electrode of the IC module are partly pressed into the thermoplastic resin sheet,
An antenna sheet, wherein the capacitor is a capacitor that can be adjusted in capacitance, and is made of a conductive wire coated with an insulating film.   The capacitor capable of adjusting the capacitance is repeatedly folded back and forth in a zigzag manner, thereby conducting a wire composed of a series of patterns including a plurality of parallel lines at equal intervals in a direction intersecting the extending direction, and the series 2. The antenna sheet according to claim 1, wherein the antenna sheet is formed of a conductive wire covered with an insulating film formed so as to intersect the pattern on the upper side or the lower side of the pattern.   A non-contact information recording medium manufactured using the antenna sheet according to claim 1, wherein a thermoplastic resin sheet is laminated on a surface of the antenna sheet on which the IC module is disposed. A non-contact information recording medium.   A non-contact information recording medium manufactured using the antenna sheet according to claim 1, wherein paper, cloth, or a combination thereof is bonded to a surface of the antenna sheet on which the IC module is disposed. A non-contact information recording medium characterized by comprising: It is a manufacturing method of the non-contact information recording medium according to claim 3,
Placing the IC module on the thermoplastic resin sheet;
A step of hot-pressing the IC module, the antenna and the capacitor into the thermoplastic resin sheet to produce an antenna sheet;
Connecting the antenna and the capacitor to the IC module;
A step of laminating a thermoplastic resin sheet on the surface of the antenna sheet on which the IC module is disposed, and then heat-pressing the antenna sheet and the thermoplastic resin sheet; and
A step of adjusting electrostatic capacity by breaking a folded portion of a conductive wire consisting of a series of patterns including a plurality of parallel lines at equal intervals in a direction intersecting the extending direction by repeatedly folding back and forth in a zigzag shape. And a method of manufacturing a non-contact information recording medium. It is a manufacturing method of the non-contact information recording medium according to claim 4,
Placing the IC module on the thermoplastic resin sheet;
A step of hot-pressing the IC module, the antenna and the capacitor into the thermoplastic resin sheet to produce an antenna sheet;
Connecting the antenna and the capacitor to the IC module;
Adhering paper or cloth or a combination thereof to the antenna sheet using an adhesive on the surface of the antenna sheet on which the IC module is disposed;
A step of adjusting electrostatic capacity by breaking a folded portion of a conductive wire consisting of a series of patterns including a plurality of parallel lines at equal intervals in a direction intersecting the extending direction by repeatedly folding back and forth in a zigzag shape. And a method of manufacturing a non-contact information recording medium.