JP2002157563A - Non-contact ic card and its manufacturing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a non-contact IC card in which fine adjustment can be easily applied to the resonance frequency of an antenna coil and its manufacturing method. SOLUTION: This non-contact IC card where a circuit board 10 and an antenna coil 11 that is connected to the circuit board 10 and transmits and receives information through a prescribed medium are sealed with coated resin 12, the resin 12 is composed of two sheets of films made from heat fusion bonded resin, fusion bonded to each other by heat, the antenna coil 11 is composed of a winding coil 14 obtained by positioning thin metallic wire (copper wire 14A) with needle members 13 and winding the thin metallic wire spirally in a polygonal or its similar shape on one film, and the winding coil 14 and the circuit board 10 are sealed between the two sheets of the films, is provided with a tuning means T tuning the resonance frequency of the antenna coil 11.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a non-contact IC card used for various cards, product tags, labels, etc., in which an antenna coil is positioned by positioning a thin metal wire on one film with a needle member. More particularly, the present invention relates to a non-contact IC card capable of finely adjusting the resonance frequency of an antenna coil and a method for manufacturing the same.

[0002]

2. Description of the Related Art As this kind of non-contact IC card, FIG.
As shown in FIG. 1, a circuit board 1 such as an IC chip on which electronic components are mounted, and an antenna coil 2 connected to the circuit board 1 and transmitting and receiving information via a predetermined medium such as electromagnetic coupling and radio waves, A configuration sealed with a coating resin 3 is known (JP-A-9-1969 and JP-A-9-19-1).
970, etc.).

[0003] Among the components of such a non-contact IC card, when a winding coil in which a thin metal wire such as a copper wire having a circular or rectangular (elliptical) cross section is spirally wound is used as the antenna coil 2, In the above, the winding coil is formed on one of the two covering resin films, and the formed winding coil and the circuit board are attached to the one covering resin film by the other covering resin film to form a coil. The coil and the circuit board are sealed with a coating resin.

However, such a non-contact IC card has a structure in which a winding coil is formed by spirally winding a thin metal wire such as a copper wire on a coating resin film. The wire itself is difficult, and it is also difficult to maintain the shape of the wound winding coil, and it is difficult to accurately form the winding coil into a regular shape, for example, a square shape. It has been extremely difficult to form a coil having a complicated shape.

In order to solve such a problem, the coating resin is composed of two films made of a heat-sealing resin which are heat-sealed to each other, while the antenna coil is positioned on one of the films by positioning the thin metal wire. There has been proposed a non-contact IC card which is constituted by a winding coil wound in a predetermined shape and positioned in such a manner as to be sealed between the winding coil, the circuit board and the two films (see, for example, Japanese Patent Application Laid-Open Publication No. HEI 10-157556). Kaiping 1
1-1115360 gazette).

On the other hand, in such a conventional non-contact IC card, a plurality of needle members as positioning means are inserted into one of the two films, and a thin metal wire is sequentially hung on each of the needle members on one of the films. To form a coil coil wound in a predetermined spiral shape, and since the needle member is merely located at the direction change portion of the coil coil, that is, at the corner portion, The distance between the thin metal wires in each winding portion of the coil is not constant depending on the product, and may vary.

As will be described later, the fluctuation of the interval between the fine metal wires in each winding portion of the winding coil changes the line capacitance of the winding coil and affects the amount of fluctuation of the resonance frequency as a module.

[0008] For example, when the thin metal wires are in close contact with each other, the wire-to-wire capacity of the coil becomes large, and this wire-to-wire capacity varies greatly depending on the thickness of the insulating film, the wire diameter, and the winding state. There is a problem that the width of the resonance frequency is wide due to the coil characteristics.

The present inventors have disclosed a Japanese Patent Application No. 12-221560.
In the above, when the antenna coil is composed of a winding coil wound in a predetermined spiral shape by positioning a thin metal wire on one of the films by a needle member, the arrangement structure of the needle member causes a resonance frequency as a module. A non-contact IC card and a method of manufacturing the same have been proposed.

[0010]

However, in these conventional devices, fine adjustment of the resonance frequency of the antenna coil cannot be performed, the variation width of the resonance frequency of the antenna coil becomes large, and uniform communication quality cannot be obtained. There was such a problem.

For example, the resonance frequency Fo of the antenna coil
It is necessary to change the inductance Lwc of the antenna coil, the input capacitance Cchip of the circuit board such as an IC chip, and the stray capacitance Cwc of the antenna coil, and it is necessary to change the form of the antenna coil and the circuit board.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and a winding coil in which an antenna coil is wound in a predetermined spiral shape by positioning a thin metal wire on one film by a needle member. It is an object of the present invention to provide a non-contact IC card capable of easily fine-tuning the resonance frequency of an antenna coil when configuring from above, and a method for manufacturing the same.

[0013]

According to the present invention, there is provided a contactless IC card according to the first aspect of the present invention, wherein a circuit board on which electronic components are mounted is connected to the circuit board, and information is transmitted through a predetermined medium. An antenna coil to be transmitted and received is sealed with a coating resin, wherein the coating resin is formed of two films of a heat-sealing resin which are heat-sealed to each other, The film is composed of a winding coil wound in a spiral shape in a polygonal or similar shape by positioning a thin metal wire with a needle member,
In the non-contact IC card sealed between the winding coil, the circuit board, and the two films, tuning means for tuning a resonance frequency of the antenna coil is provided.

The invention according to claim 2 is characterized in that the tuning means for tuning the resonance frequency of the antenna coil comprises a thin metal wire connected to the antenna coil and the circuit board and cut to have an appropriate length. .

The invention according to claim 3 is characterized in that the fine metal wire constituting the tuning means has a meandering shape composed of a large number of turns.

According to a fourth aspect of the present invention, in the fine metal wire constituting the tuning means, a corner portion of an appropriate number of the plurality of turn portions is cut and connected to the antenna coil and the circuit board. The length of the thin metal wire is adjusted, and the resonance frequency of the antenna coil is tuned.

The invention according to claim 5 is characterized in that at least a part of the fine metal wire constituting the tuning means is wrapped and wound.

The invention according to claim 6 is characterized in that the fine metal wire constituting the tuning means is positioned and arranged on one of the films by a needle member.

The invention according to claim 7 is characterized in that a part of the needle member is arranged such that a thin metal wire constituting the tuning means is hooked in a substantially triangular shape at a corner of the turn portion. And

According to a eighth aspect of the present invention, there is provided a non-contact IC card manufacturing method, comprising: a circuit board on which electronic components are mounted; an antenna coil connected to the circuit board for transmitting / receiving information via a predetermined medium; A tuning means for tuning the resonance frequency of the antenna coil, wherein the tuning means is made of a thin metal wire connected to the antenna coil and cut to have an appropriate length; The method according to claim 1, wherein a plurality of first needle members are inserted into each corner of one of two films made of a heat-sealing resin which are heat-sealed to each other as the coating resin. A step of inserting a number of second needle members into the substantially middle portion of one of the films,
On the one film, a thin metal wire is sequentially wound on each first needle member to form a spirally wound coil having a polygonal or similar shape, and the thin metal wire is wound on each second needle member. Forming a tuning means by successively applying the heat treatment to each other; and sealing the winding coil, the tuning means, and the circuit board to each other by heat-sealing the other film to seal the two films. , Is included.

According to a ninth aspect of the present invention, the step of attaching the other film to the one film by heat fusion comprises:
On one of the films, a winding wire wound in a spiral shape of a polygon or similar shape by forming a thin metal wire on each of the needle members sequentially and tuning means is formed. It is characterized in that it slides while being held by the tuning means and moves by a predetermined length, and the other film is bonded by heat fusion at the moving position.

According to a tenth aspect of the present invention, there is provided a non-contact structure comprising a plurality of films obtained from a large one film, and a winding coil, a tuning means, and a circuit board each comprising the plurality of films. It is characterized by manufacturing an IC card.

Next, the operation of the present invention will be described. In the contactless IC card according to the first aspect of the present invention, fine adjustment of the resonance frequency of the antenna coil can be easily performed, and various non-contact IC cards having different resonance frequencies of the antenna coil can be used. The manufacturability of a non-contact IC card can be improved, for example, there is no need to manufacture a contact IC card.

According to the second aspect of the present invention, fine adjustment of the resonance frequency of the antenna coil can be easily performed by cutting the thin metal wire.

According to the third aspect of the present invention, even if the tuning means is provided, the non-contact IC card does not take up much space, and the size of the non-contact IC card can be reduced.

In the invention according to claim 4, tuning can be performed more easily and reliably.

The invention according to claim 5 is effective when the total capacity is insufficient.

In the invention according to claim 6, the thin metal wire can be accurately arranged on the film.

In the invention according to claim 7, the fine metal wires constituting the tuning means can be arranged in a meandering shape without contact, and the resonance frequency of the antenna coil can be easily adjusted accurately.

In the method for manufacturing a non-contact IC card according to the present invention, a means for tuning the resonance frequency of the antenna coil can be easily provided, and a thin metal wire is hung on the first and second needle members. Therefore, the method of easily making the winding coil and the tuning means on the film can be provided. Therefore, the tuning means of the resonance frequency of the antenna coil can be easily provided.
By winding the thin metal wire on the first and second needle members, it is possible to easily form a coil coil and a tuning means on the film.

According to the ninth aspect of the present invention, the film is successively moved from the winding coil and the tuning means to the attaching portion, so that the non-contact IC card can be manufactured one after another, and the productivity can be further improved.

According to the tenth aspect of the present invention, a large number of non-contact IC cards can be manufactured from a large film in a simple process.

[0033]

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings.

FIG. 1 shows an embodiment of a non-contact IC card according to the present invention.

This non-contact IC card includes a circuit board 10 such as an IC chip on which electronic components are mounted, and a circuit board 1
The antenna coil 11 is connected to the antenna coil 11 and transmits / receives information via a predetermined medium such as electromagnetic coupling and radio waves, and the tuning means T for tuning the resonance frequency of the antenna coil 11 is sealed with a coating resin 12. You.

Here, the coating resin 12 is a heat-sealing resin which is heat-sealed to each other, for example, polyester resin 2.
Consists of a single film.

The antenna coil 11 has a polygonal shape or a similar shape obtained by positioning a copper wire 14A as a thin metal wire with a large number of first needle members 13A on one of the films. It is composed of a winding coil 14 wound in a shape.

Here, the resonance frequency Fo of the antenna coil 11 is determined by the inductance Lwc of the antenna coil 11, the input capacitance Cchip of the circuit board 10, the antenna coil 11
And the stray capacitance Cwc of

[Outside 1] It is represented by

Therefore, when the antenna coil 11 is formed, the resonance frequency Fo of the antenna coil 11 can be easily adjusted by changing the length of the extended thin metal wire.

That is, the tuning means T for tuning the resonance frequency of the antenna coil 11 is a copper wire which is connected to the antenna coil 11 and the circuit board 10 and which is an extension of the copper wire 14A as a thin metal wire cut to an appropriate length. 14B, a copper wire 1 constituting a tuning means
4B has a zigzag or other meandering shape composed of a large number of turns t.

In this case, the copper wire 14B constituting the tuning means T has a meandering shape extending in the horizontal direction when the circuit board 10 is at the upper position in the figure.

The copper wire 14B constituting the tuning means T is connected to the circuit board 10 when the circuit board 10 is at the upper position in FIG.
A meandering shape extending in the vertical direction may be used.

The copper wire 14B constituting the tuning means T is formed by cutting off the corners of an appropriate number of the turn portions t among the many turn portions t, so that the copper wire 14B connected to the antenna coil 11 is cut off. Adjusted length, antenna coil 1
1 is tuned. The details will be described later.

In this embodiment, at least a part of the copper wire 14B constituting the tuning means T is wrapped.

On the other hand, the copper wire 14B constituting the tuning means T is provided on one of the films by the second needle member 13B.
To position and arrange.

Then, the winding coil 14, the tuning means T and the circuit board 10 are sealed between the two films.

In FIG. 1, S indicates the start of winding of the winding coil 14 and the tuning means T, and E indicates the end of each non-contact IC card.

Here, the first and second needle members 13A, 13A
The arrangement structure of 3B will be described.

That is, in FIG.
Needle member 13 for positioning copper wire 14A constituting
A is inserted into one of the films and the copper wire 14
A (fine metal wire) is sequentially applied. A large number of first needle members 13B are arranged at predetermined intervals so as to form a substantially I-shape at four corners of one of the films, and
The substantially I-shaped arrangement is determined so that adjacent copper wires 14A (thin metal wires) hung on the corresponding substantially corresponding I-shaped first needle members 13B have a predetermined interval therebetween.

The second needle member 13B for positioning the copper wire 14B constituting the tuning means T is connected to the copper wire 1B.
4B are arranged so as to be hooked in a substantially triangular shape at the corner of the turn part t.

In this case, the start portion 14a of the copper wire 14B constituting the tuning means T is hooked on three of the second needle members 13B having a substantially triangular shape, and the return portion 14b of the copper wire 14B is substantially It is hooked on two of the triangular second needle members 13B.

As shown in FIG. 2, the first needle member 1
3A may be arranged in large numbers at a predetermined interval so as to form a substantially V-shape with an open inside. In this case, the angle θ of the substantially V-shape is set to 7
It is good to be 0 degrees.

Where

[Outside 2] It is represented by

Then, for example, the Fo of the turn portion per one of the copper wires 14B constituting the tuning means T is equal to 0.
Since it changes by 2 to 0.5 MHz, if the length of the turn part per one is set short, 0.1 to 0.3 MH
A change rate of about z can be set.

The general allowable range of Fo is +0.2 MHz.
Since it is estimated to be about -0.2 MHz, if the fine adjustment step is performed in units of 0.3 MHz, it can be sufficiently adjusted to a practical range.

Next, an embodiment of a method for manufacturing such a non-contact IC card will be described. The method for manufacturing this non-contact IC card includes the following steps. That is,

(1) As the coating resin 12, a large number of first needle members 13A are inserted into each corner of one of two films made of a heat-sealing resin which are heat-sealed to each other. A step of inserting a large number of second needle members 13B into substantially the middle of one of the films

(2) Copper wire 14 on one film
A (fine metal wire) is sequentially wound on each first needle member 13A to form a coil coil 14 wound in a predetermined spiral shape, and a copper wire 14B (fine metal wire) is formed on each second needle member 13B. Step of forming tuning means T by successively applying

(3) In order to seal the winding coil 14, the tuning means T and the circuit board 10 between two films,
A step of attaching the other film to one film by heat fusion

In this case, the step of attaching the other film to one of the films by heat sealing is such that a copper wire 14A is sequentially hung on each of the first needle members 13A on one of the films to form a predetermined spiral shape. After the winding coil 14 is formed and the tuning means T are formed, the film is slid on the two needle members 13A and 13B while being held by the winding coil 14 and the tuning means T to a predetermined length. Then, the other film is attached by heat fusion at the moving position.

FIG. 3 shows an example of a manufacturing apparatus for executing the method for manufacturing a non-contact IC card.

That is, the one film 12A is wound around the winding section 15, is pulled out from the winding section 15 in a horizontal direction, extends, and is slid rightward in the figure by a film slide means (not shown). .

[0063] The other film 12B is
5, the film is wound around a winding unit 16 disposed at a position offset from the winding unit 15 by a predetermined distance in the lateral direction, and one film 12 </ b> A extends from the winding unit 16. The film is pulled out and extended in the same horizontal direction as the direction, and is slid rightward in the figure by film slide means (not shown).

The lower portion of the film 12A near the winding section 15 has a large number of first and second needle members 13A, 13A.
3B is provided.

The first and second needle members 13A, 13A
3B is a driving unit 17 which is slid left and right and up and down
Are arranged in a predetermined shape on the upper surface of the, and extend upward.

The drive unit 17 is driven to slide up and down, and is also reciprocally slid left and right between the position A (the position where the needle member is inserted and the copper wire is wound and the position B) (the bonding position) in the figure.

First, the drive unit 17 is slid upward at the position A in the figure, and the first and second
Needle members 13A and 13B are inserted into the lower film 12A.

Next, in the lower film 12A, a winding coil wound in a predetermined spiral shape with a thin metal wire sequentially hung on each of the first and second needle members 13A and 13B protruding from the upper surface of the film 12A. Are formed and tuning means T is formed.

Next, the lower film 12A is slid in the right direction in the figure by a predetermined distance, and the drive unit 17 is also slid in the same direction.

As a result, the portion where the winding coil 14 and the tuning means T are formed on the lower film 12A moves to the position B in the drawing.

In this B position, the lower film 12
A, the upper film 12B is bonded by heat fusion, and the winding coil 14, the tuning means T, and the circuit board 1
0 is sealed between the two films 12A and 12B.

Thereafter, the drive unit 17 is slid to the left in the drawing to return to the position A, and the upper film 12B is slid to the right in the drawing to prepare for the next heat fusion.

This operation is repeated, and the winding coil 14, the tuning means T, and the circuit board 10 are sealed between the two films, and are sequentially fed to the right.

In the non-contact IC card having such a configuration, as a result of providing the tuning means T for the resonance frequency of the antenna coil 11, fine adjustment of the resonance frequency of the antenna coil 11 can be performed, and the resonance frequency of the antenna coil 11 differs. There is no need to manufacture multiple antennas.

In particular, in order to change the resonance frequency of the antenna coil 11, it is not necessary to change the inductance Lwc of the antenna coil 11, the input capacitance Cchip of the circuit board 10, and the stray capacitance Cwc of the antenna coil 11 itself. There is no need to change the type of 11 or the circuit board 10 itself.

In the present embodiment, the copper wire 14B (thin metal wire) constituting the tuning means T is formed in a meandering shape composed of a large number of turns t, and an appropriate number of turns out of the large number of turns t. Cut the corner of the part t, and use the copper wire 14B
Is adjusted so as to tune the resonance frequency of the antenna coil 11. Therefore, the antenna coil 11 having the desired resonance frequency can be easily obtained simply by cutting off an appropriate number of corners of the turn portion t. can do.

Further, in the present embodiment, at least a part of the copper wire 14B constituting the tuning means T is overlapped and wound, so that the total capacity can be increased and is effective when the total capacity is insufficient. It is.

Further, in this embodiment, the copper wire 14B constituting the tuning means T is connected to the second needle member 13
B allows the copper wire 14B to be accurately arranged on the film.

In particular, in the present embodiment, the copper wire 14B constituting the tuning means T is arranged so as to form a substantially triangular shape at the corner of the turn portion t. The antenna coil 11 can be arranged in a meandering shape without contact, and the resonance frequency of the antenna coil 11 can be easily adjusted accurately.

The covering resin 12 is composed of two films made of a heat-sealing resin which are heat-sealed to each other, and the antenna coil 11 is made of a copper wire 14A in one of the films.
A fine metal wire is positioned by a first needle member 13A and is constituted by a coil coil 14 wound in a predetermined spiral shape, and a copper wire 14B is positioned by a second needle member 13B to adjust the tuning means T. Since the winding coil 14, the tuning means T, and the circuit board 10 are sealed between the two films, the winding of the copper wire 14A (fine metal wire) becomes easy, and It is easy to maintain the shape of the wound coil 14 which is turned, and it is easy to accurately form the wound coil 14 into a regular shape, for example, a square shape. The formation of 14 is also easy.

The winding coil 14 can be easily formed in a complicated polygonal shape or a spirally wound shape similar thereto, and need not be a substantially square shape as in the present embodiment.

Further, according to the method for manufacturing a non-contact IC card, as the coating resin 12, a large number of first films are formed at each corner of one of two films made of a heat-sealing resin which are heat-sealed to each other. While inserting the one needle member 13A,
A large number of second films are provided at approximately the middle of one of the two films.
And a copper wire 14A (a fine metal wire) is sequentially wound on each of the first needle members 13A on one of the films to form a winding coil 14 having a predetermined spiral shape. 14B (thin metal wire) is sequentially applied to each second needle member 13B to form the tuning means T, and the winding coil 14, the tuning means T and the circuit board 10 are connected to each other.
Since the other film is bonded to one film by heat fusion in order to seal between the films, tuning means T for tuning the resonance frequency of the antenna coil 11 can be easily provided. Lines 14A, 14B
Is wound on each of the first and second needle members 13A and 13B, so that winding coils and tuning means can be easily formed on the film 12A. Further, the other film 12B is attached to the one film 12A. The circuit board 10, the antenna coil 11, and the tuning means T can be easily covered with the covering resin 12 by being bonded by heat fusion, and the winding coil 14 can be formed in a regular shape, for example, as in the present embodiment. The manufacturability of the non-contact IC card can be improved while being accurately formed in a substantially square shape or the like.

Here, an equivalent circuit and mathematical expressions of the present non-contact IC card will be described. FIG. 4 is an equivalent circuit of the non-contact IC card.

In this figure, the antenna coil 11 (A
In NT), Lwc is inductance, Rwc is conductor resistance, and Cwc is stray capacitance.

In the circuit board 10, C chip is an input capacitance, and R chip is a parallel equivalent resistance.

In the tuning means T, Cwcn is
It is the capacitance between lines and is proportional to its length.

The inductance Lwc is determined by the winding of the winding coil 14, and its variation is small.

The stray capacitance Cwc changes due to parallel winding or close winding of the coil portion of the winding coil 14.

In short, the stray capacitance Cwc is equal to the winding coil 1
The variation width is large depending on the winding state of the coil portion and the wire thickness of the coil portion, and it is better that the variation width is small for control.

Due to the performance of the antenna coil 11, the conductor resistance R
A smaller wc is preferable because the total capacity of the non-contact IC card becomes larger.

The stray capacitance Cwc becomes small in the case of parallel winding, but when the input capacitance Cchip of the circuit board is small, the total capacity of the non-contact IC card may be insufficient.

As in the present embodiment, the tuning means T
, At least a part of the copper wire 14B is wound in a loop to compensate for the stray capacitance Cwc, and the stray capacitance Cwc and the input capacitance Cwc
The line capacitance Cwcn in the tuning means T can be set in consideration of the variation of the chip.

Next, the specifications of various forms of contactless IC cards will be described.

FIG. 5A shows a large loop having a stray capacitance Cwc.
There are one turn for the winding and medium coil portions and two turns for the large coil portion. And the total line length is 0.205 + 0.224 + 0.2
42 * 2 = 0.913m The average loop length is 0.913 / 4 = 0.2283m

The one shown in FIG. 5B has a small loop portion and a middle loop portion provided with a stray capacitance Cwc. The small coil portion has two turns, and the medium coil portion has two turns. And the total line length is 0.205 * 2 + 0.224 * 2 =
0.858m The average loop length is 0.858 / 4 = 0.2145m

The one shown in FIG. 5C is one in which the stray capacitance Cwc is provided in the middle loop portion and the large loop portion. The middle coil portion has two turns and the large coil portion has two turns. And the total line length is 0.224 * 2 + 0.242 * 2
= 0.932 m The average loop length is 0.932 / 4 = 0.233 m

FIG. 5 (D) shows a small loop portion and a large loop portion having a stray capacitance Cwc. The small coil portion has two turns and the large coil portion has two turns. And the total line length is 0.205 * 2 + 0.242 * 2
= 0.894 m The average loop length is 0.894 / 4 = 0.2235 m

The one shown in FIG. 5 (E) has a stray capacitance Cwc in the middle loop portion. The middle coil portion has three turns and the large coil portion has one turn. And the total line length is 0.224 * 3 + 0.242 =
0.914 m The average loop length is 0.914 / 4 = 0.2285 m

FIG. 5 (F) shows a close-coiled winding in which a small loop portion has a stray capacitance Cwc, and a small coil portion has four turns. The total line length is 0.205 * 4 = 0.82 m. The average loop length is 0.82 / 4 = 0.205 m.

The one shown in FIG. 5 (G) is a close-coiled winding in which a stray capacitance Cwc is provided in a middle loop portion, and a medium coil portion has four turns. The total line length is 0.224 * 4 = 0.896 m. The average loop length is 0.896 / 4 = 0.224 m.

FIG. 5H shows a close-coiled winding having a stray capacitance Cwc in a large loop portion, and four large coil portions. The total line length is 0.242 * 4 = 0.968 m. The average loop length is 0.968 / 4 = 0.242 m.

The coil shown in FIG. 5 (I) corresponds to a parallel winding and has a stray capacitance Cwc as small as possible.

Next, a method for tuning the resonance frequency of the antenna coil 11 will be described based on experimental data of the present inventors.

The present inventors, instead of the circuit board 10,
A capacitor corresponding to the input capacitance of the circuit board 10 was connected, and the resonance frequency (MHz) of the antenna coil 11 was measured with a dip meter.

In this case, the corners of the turn portion t of the copper wire 14B constituting the tuning means T in the non-contact IC card were cut one by one, and the resonance frequency at that time was measured.

As one of the experimental results, taking the non-contact IC card shown in FIG. 5 (A) as an example, there are eleven turn portions of the meandering copper wire 14B constituting the tuning means T. First to eleventh corners.

In the case where none of the corners of the turn portion t of the copper wire 14B is cut, 17.10 MHz and the first corner a
Is cut, 16.67 MHz when the second corner b is cut, 16.06 MHz when the third corner c is cut, 15.79 MHz when the third corner c is cut, and the fourth corner d is cut 15.37 MHz when cutting the fifth corner e, 15.09 MHz when cutting the sixth corner f, 14.72 MHz when cutting the sixth corner f, and cutting the seventh corner g Is 14.42 MHz, when the eighth corner h is cut, 14.09 MHz, when the ninth corner i is cut, 13.80 MHz, when the tenth corner j is cut, 13.56 MHz, and 13.21 MHz when the eleventh corner k was cut.

As is apparent from the experimental results, the resonance frequency of the antenna coil 11 is reduced by cutting the corners of the turn portions t of the meandering copper wire 14B constituting the tuning means T one by one. It is clear that the length can be adjusted proportionally.

In manufacturing a non-contact IC card, in the present embodiment, as shown in FIG. 1, a large number of films are punched out or cut out from a single large film. Many sheets (for example, 30
A non-contact IC card including a winding coil, a resonance frequency tuning means for an antenna coil, and a circuit board is manufactured from each of the films.

As shown in FIG. 6, the two films 12A and 12B are both made of a tape 18 coated with an adhesive which covers the antenna coil 11, or the two films 12A and 12B Tape 1 coated with an adhesive, one of which covers antenna coil 11
8 may be used.

According to this configuration, conventionally, a hole for mounting an IC chip module, which is a circuit board, is formed in a film. However, it is not necessary to form a hole, and the number of steps and material costs can be reduced.

[0112]

As described above, according to the first aspect of the present invention, a circuit board on which electronic components are mounted, and an antenna coil connected to the circuit board and transmitting and receiving information via a predetermined medium Are sealed with a coating resin, wherein the coating resin is formed of two films of a heat-sealing resin which are heat-sealed to each other, and the antenna coil is formed of a metal film on one of the films. A non-contact IC card comprising a winding coil spirally wound in a polygonal or similar shape by positioning a thin wire with a needle member, and sealed between the winding coil, a circuit board, and two films. Since the means for tuning the resonance frequency of the antenna coil is provided, fine adjustment of the resonance frequency of the antenna coil can be easily performed, and the resonance frequency of the antenna coil may be different. It is not necessary to manufacture the non-contact IC card or the like, it is possible to improve the manufacture of the contactless IC card.

According to the second aspect of the present invention, since the tuning means for tuning the resonance frequency of the antenna coil is formed of a thin metal wire connected to the antenna coil and the circuit board and cut into appropriate lengths, By cutting, fine adjustment of the resonance frequency of the antenna coil can be easily performed.

According to the third aspect of the present invention, since the fine metal wire constituting the tuning means is formed in a meandering shape including a large number of turns, even if the tuning means is provided, the non-contact IC card can be used. The contactless IC card can be reduced in size without taking up much space.

According to the fourth aspect of the present invention, the fine wire forming the tuning means is cut at the corners of a large number of turns, and the length of the thin metal wire is adjusted to adjust the resonance frequency of the antenna coil. I decided to tune
Tuning can be performed more easily and accurately.

According to the fifth aspect of the present invention, at least a part of the fine metal wire constituting the tuning means is wound in a lap, which is effective when the total capacity is insufficient.

According to the sixth aspect of the present invention, the fine metal wires constituting the tuning means are positioned and arranged by the needle member on one of the films, so that the fine metal wires can be accurately arranged on the film. it can.

According to the seventh aspect of the present invention, a part of the needle member is arranged such that the thin metal wire constituting the tuning means forms a substantially triangular shape at the corner of the turn portion. Can be arranged in a meandering manner without contact, and the resonance frequency of the antenna coil can be easily adjusted accurately.

According to the eighth aspect of the present invention, a non-contact IC
In manufacturing the card, a large number of first needle members are inserted into each corner of one of two films made of a heat-sealing resin which are heat-sealed to each other as a coating resin, and the two films are formed. A large number of second
Inserting a needle member, and forming a spirally wound winding coil having a polygonal or similar shape by sequentially hanging a thin metal wire on each of the first needle members on the one film. Forming a tuning means by sequentially applying a thin wire to each of the second needle members; and sealing the wound coil, the tuning means, and the circuit board between the two films by applying one film to the other film. And a step of attaching by heat fusion. Therefore, it is possible to easily provide a tuning means of the resonance frequency of the antenna coil, and further, by hanging a thin metal wire on the first and second needle members, Non-contact IC cards can be easily formed on winding films and tuning means on the film, and the winding coils and tuning means can be accurately formed. It is possible to improve the manufacturability.

According to the ninth aspect of the present invention, the step of attaching the other film to one of the films by heat fusion includes the step of attaching a thin metal wire to each of the first and second needle members on the one film. After forming a coil wound in a predetermined spiral shape by successively applying the film, the film is first and second.
The needle is moved by a predetermined length by sliding operation while being held by the winding coil on the needle member, and the other film is bonded by heat fusion at the moving position, so that the film is not transferred from the winding coil and the tuning means. The contactless IC card can be successively manufactured by being successively moved to the attaching section, and the manufacturability can be further improved.

According to the tenth aspect, the large 1
Since a large number of films are obtained from a large number of films, and a non-contact IC card including a winding coil, a tuning means, and a circuit board is manufactured from the large number of films, a large film can be easily manufactured. A large number of non-contact IC cards can be manufactured in a simple process.

[Brief description of the drawings]

FIG. 1 is a plan view of a non-contact IC card according to an embodiment of the present invention.

FIG. 2 is a plan view showing an arrangement example of another needle member.

FIG. 3 is a schematic view of an apparatus for performing the method for manufacturing a non-contact IC card according to the embodiment;

FIG. 4 is an equivalent circuit diagram of the contactless IC card according to the embodiment.

FIG. 5 is a schematic diagram showing the specifications of various forms of contactless IC cards.

FIG. 6 is a plan view showing another example of the method for manufacturing the non-contact IC card according to the embodiment;

FIG. 7 is a perspective view of a conventional non-contact IC card.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Circuit board 11 Antenna coil 12 Coating resin 13A 1st needle member 13B 2nd needle member 14 Winding coil 14A Copper wire (thin metal wire) 14B Copper wire (thin metal wire) 15 Winding part 16 Winding part

Claims (10)

[Claims] 1. A configuration in which a circuit board on which electronic components are mounted and an antenna coil connected to the circuit board and transmitting and receiving information via a predetermined medium are sealed with a covering resin. The coating resin is formed of two films of a heat-sealing resin which are heat-sealed to each other, and the antenna coil is formed into a polygon or a similar shape by positioning a thin metal wire on one of the films by a needle member. A non-contact IC card comprising a spirally wound winding coil and sealed between the winding coil, a circuit board, and two films, wherein a resonance frequency tuning means for the antenna coil is provided. Contactless IC card. 2. The device according to claim 1, wherein the tuning means for tuning the resonance frequency of the antenna coil is made of a thin metal wire connected to the antenna coil and the circuit board and cut to an appropriate length. Contact IC card. 3. The non-contact IC card according to claim 2, wherein the fine metal wire constituting the tuning means has a meandering shape including a large number of turns. 4. A thin metal wire constituting the tuning means is formed by cutting an appropriate number of corners of a large number of turns and cutting the metal wire connected to the antenna coil and the circuit board. 4. The non-contact IC card according to claim 3, wherein the frequency is adjusted and the resonance frequency of the antenna coil is tuned. 5. The non-contact IC card according to claim 2, wherein at least a part of the fine metal wire constituting the tuning means is wound in an overlapping manner. 6. The non-contact wire according to claim 2, wherein the fine metal wire constituting the tuning means is positioned and arranged by a needle member on one of the films. IC card. 7. A part of the needle member is arranged so that a thin metal wire constituting a tuning means can be hooked in a substantially triangular shape at a corner of a turn portion. 6. The non-contact IC card according to any one of 6. 8. A circuit board on which electronic components are mounted, an antenna coil connected to the circuit board for transmitting / receiving information via a predetermined medium, and a tuning means for tuning a resonance frequency of the antenna coil, the antenna comprising: A tuning means comprising a thin metal wire connected to the coil and cut to have an appropriate length, and a method for manufacturing a non-contact IC card, wherein the non-contact IC card is sealed with a coating resin. At each corner of one of the two films made of the heat-sealing resin to be fused, a large number of first needle members are inserted, and a large number of the first needle members are inserted into a substantially intermediate portion of one of the two films. A step of inserting a second needle member, and winding a thin metal wire over each of the first needle members on the one film in a spiral shape of a polygon or similar shape. Forming a tuning means by sequentially applying the metal wire to each second needle member, and sealing the winding coil, the tuning means and the circuit board between the two films. A method for manufacturing a non-contact IC card, comprising: bonding one film to another film by heat fusion. 9. The step of attaching the other film to the one film by heat fusion, wherein the one or more thin films are sequentially hung on each of the first and second needle members on the one film to form a polygon or a polygon. After forming a spirally wound winding coil and tuning means of a similar shape, the film is slid to a predetermined length by holding the film on each of the first and second needle members while holding the wound coil and the tuning means. 9. The method for manufacturing a non-contact IC card according to claim 8, wherein the non-contact IC card is moved by a distance and the other film is bonded by heat fusion at the moving position. 10. A non-contact IC card comprising a plurality of films obtained from a single large film, and a wound coil, a tuning means, and a circuit board, respectively, being manufactured from each of the plurality of films. The method for manufacturing a non-contact IC card according to claim 8 or 9, wherein: