JP2000067197A - Ic card - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the IC card which has high reliability by actualizing a tuning circuit which uses a coil formed of a conductive pattern without using components such as a chip capacitor. SOLUTION: A coil 100 and an electronic circuit 20 are provided on one surface of the IC card 2, a 1st conductive pattern 118 is provided at one end of the coil 100 on the same surface, and a 2nd conductive pattern 116 which is coupled with the other end of the coil 100 is provided on the opposite surface of the substrate 32 from the coil 100 at the position corresponding to the 1st conductive pattern 118. The 1st conductive pattern 118 and 2nd conductive pattern 116 have specific electrostatic capacity through the substrate 32 and then a tuning circuit having a specific resonance frequency is constituted together with the coil 100.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an IC card for transmitting signals to and from an external device via a coil provided as a conductor on a substrate.

[0002]

2. Description of the Related Art Conventionally, an I / O having a configuration as shown in FIG.
C card 7 has been used. The IC card 7 includes the substrate 3
An electronic circuit 2 for transmitting a signal to the outside through a coil 70, a power supply 30, and a coil 70 provided as a conductive pattern on the outer periphery of the coil 2 by a conductive pattern.
0 and a power supply pattern 72 for connecting the electronic circuit 20 and the power supply 30.

The coil 70 of the IC card 7 shown in FIG.
There is a demand to increase the number of turns of the coil to one or more to further increase the signal transmission efficiency with the outside. In order to meet such a request, an IC card 8 as shown in FIG. 15 has been proposed. As shown in FIGS. 15A and 15B, the IC card 8 has a coil 80 having two turns, and one end of the coil 80 is directly connected to the electronic circuit 20, and the other end of the coil 80 is connected to the electronic circuit 20. As shown in the circle a, the circuit 20 is connected to the back surface pattern 84 provided on the surface (back surface) of the substrate 32 opposite to the coil 80 by a through hole. Note that I
The equivalent circuit of the C card 8 is as shown in FIG. FIG. 16 shows a configuration of the IC card 8 in which the conductive pattern of the coil 80 of the IC card 8 shown in FIG. 15 is provided along the outer periphery of the substrate 32 and the area of the coil 80 is increased.

[0004]

By the way, a capacitor is connected in parallel to the coil 80 of the IC card 8 so that the electronic circuit 2
There is a demand to improve the efficiency of signal transmission by configuring a tuning circuit that tunes to the frequency of the signal that 0 inputs and outputs.
There is also a demand that the current induced in the tuning circuit be rectified and supplied to the electronic circuit 20. In order to meet these demands, for example, a method of connecting a chip capacitor having a predetermined capacity in parallel with the coil 80 is considered. However, when a chip capacitor is used, there is a problem that the chip capacitor itself or the wiring pattern on the substrate is easily broken, and the reliability of the IC card is reduced. In addition, there is a problem that the thickness of the chip component causes the IC card to be thick.

The present invention has been made in view of the above-described problems of the prior art, and has realized a tuning circuit using a coil formed of a conductive pattern without using individual components such as a chip capacitor. It is an object to provide a thin and highly reliable IC card.

[0006]

In order to solve the above-mentioned problems, an IC card according to the present invention comprises a coil provided as a conductor on one surface of a substrate of the IC card, and a coil provided on the substrate. And two signal terminals respectively corresponding to both ends of the coil are coupled to both ends of the coil, and receive and transmit signals to and from the outside by electromagnetic action via the coil. Or an electronic circuit that performs any of these, a first conductor provided on the same side of the substrate as the coil and connected to one end of the coil, and an electronic circuit on the opposite side of the substrate from the coil Surface, is coupled to the other end of the coil, has a predetermined capacitance with the first conductor through the substrate, and forms a tuning circuit with a predetermined resonance frequency together with the coil. Second conductivity With the door.

Preferably, the other end of the coil is connected to the second conductor provided on the opposite surface of the substrate by using a through hole. Specifically, the resonance frequency of the tuning circuit is adjusted by cutting the first conductor at an arbitrary position and cutting the capacitance between the first conductor and the second conductor. Is done by changing More specifically, the first conductor includes a plurality of capacitance adjusting conductors,
A connection conductor for connecting between these capacitance adjustment conductors, and adjusting the resonance frequency of the tuning circuit by cutting the connection conductor and changing the capacitance of the tuning circuit. I do. Preferably, the second conductor has an insulating region at a position where the connection conductor of the first conductor faces the substrate via the substrate. More specifically, the first conductor is composed of a plurality of non-connected capacitance adjusting conductors, and the capacitance adjusting conductor is connected with a connection conductor or a conductive paint to form the first conductor. The capacitance of the tuning circuit is adjusted. Specifically, the second conductor provided on a surface of the substrate opposite to the coil is located at a position where the connection conductor of the first conductor faces through the substrate. Has a shape without the second conductor.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First, an example of an IC card to which the present invention is applied will be described with reference to FIGS. FIG. 1 is a diagram showing a configuration of the IC card 1,
(A) shows the configuration of the IC card 1 and (B) shows an equivalent circuit of the IC card 1. FIG. 2 is a diagram showing a wiring pattern of the IC card 1 shown in FIG. 3A and 3B are diagrams showing the configuration of the coupling capacitor 110 of the IC card 1 shown in FIGS. 1 and 2, wherein FIG. 3A shows a wiring pattern of the coupling capacitor 110 viewed from the surface, and FIG. It is a cross-sectional view of the capacitor 110 cut in the XX ′ direction,
(C) and (D) show equivalent circuits of the coupling capacitor 110.

[0009] As shown in FIG.
Is a coil 100, a coupling capacitor 110, an electronic circuit 2
0 and a power supply 30, and its equivalent circuit is as shown in FIG. The electronic circuit 20 includes a microprocessor 202, a display device 212, an access control circuit 214, and a modulation / demodulation circuit 200.

The microprocessor 202 is a one-chip microcomputer including, for example, a ROM and a RAM storing a program and a predetermined peripheral circuit, and performs a predetermined operation based on input data input from the access control circuit 214 and the modulation / demodulation circuit 200. And displays the processing result on the display device 212 or outputs the processing result to the modem 200 as output data.

The modulation / demodulation circuit 200 demodulates an input signal applied to the coil 100 as a magnetic signal, generates input data to the microprocessor 202, outputs the data to the microprocessor 202, and outputs the data to the microprocessor 202.
And modulates the output data inputted thereto and outputs it to the outside as an output signal. The modulation / demodulation circuit 200 opens and closes, for example, a loop of the coil 100 in response to an output signal, and turns on / off a loop current induced by a magnetic signal applied from the outside, or generates a current corresponding to the output signal. An output signal is output to the outside by flowing through the coil 100.

The display device 212 is, for example, an LCD display device, and displays processing results of the microprocessor 202 and the like. The access control circuit 214 outputs data input by the user of the IC card to the microprocessor 202. The power supply 30 is, for example, a thin battery or a solar battery, and supplies power necessary for the operation of the electronic circuit 20.

The coil 100 is, for example, a coil having more than two windings and realized as a wiring pattern using a conductive substance on the substrate of the IC card 1, and a signal applied from the outside in the form of a magnetic signal. Is converted into an electrical input signal, and the electrical output signal input from the electronic circuit 20 is converted into a magnetic signal format and output to the outside. Note that the coil 10 that can be connected to the electronic circuit 20 is determined based on the shape of the wiring pattern.
The first terminal of 0 is directly connected to the electronic circuit 20, and the second terminal of the coil 100 that cannot be directly connected to the electronic circuit 20 is connected to the electronic circuit 20 via the coupling capacitor 110. The coupling capacitor 110 couples the second terminal of the coil 100 and the electronic circuit 20.

Hereinafter, with further reference to FIG. 2 and FIG.
The configuration of the C card 1 will be described. The wiring pattern of the IC card 1 is, for example, as shown in FIG. 2, and when the surface portion of the coupling capacitor 110 of the IC card 1 is enlarged, FIG.
The result is as shown in FIG. As shown in FIG. 2, the coil 100 is provided along the outer periphery of the substrate 32 of the IC card 1 so that the opening area of the coil is increased.

The electronic circuit 20 is disposed on the same side (surface) as the coil 100 and inside the coil 100. As a result, the signal terminal of the electronic circuit 20 and the coil 100
Can be directly connected to the first terminal a, but can be directly connected to the second terminal b without passing through a wiring pattern and a through hole on the surface (back surface) on the opposite side to the coil 100. Absent. To this end, a third conductive pattern 112 is provided at the second terminal b of the coil 100,
A fourth conductive pattern 114 is provided on the GND side power supply terminal, and the conductive patterns 114, 1 on the back surface of the substrate 32 are provided.
The second conductive pattern 116 is provided on the rear side of the portion 16.

[0016] As shown in FIG. 3 (B), and the conductive patterns 112 and 114 and the conductive pattern 116, face each other across the substrate 32 of the dielectric constant epsilon _r. Therefore, FIG.
As shown in FIG. 7, between the conductive patterns 112 and 144 and the conductive pattern 116, the capacitances C ₁ and C ₂ are generated across the substrate 32, respectively. Since the capacitances C ₁ and C ₂ generated between the capacitors 116 are connected in series,
The capacitance C of the coupling capacitor 110 shown in FIG.
₁₁₀ will be represented by the following equation.

[0017]

C ₁ = ε ₀ ε _r S ₁ / d C ₂ = ε ₀ ε _r S ₂ / d C ₁₁₀ = 1 / (1 / C ₁ + 1 / C ₂ ) (1) where S ₁ , S ₂ is a conductive pattern 112,
The area of 114, d is the thickness of the substrate 32, ε ₀ is the dielectric constant of vacuum, and ε _r is the relative dielectric constant of the substrate 32.

The capacitance of the coupling capacitor 110 can be increased to about 100 pF by increasing the area of the conductive patterns 112 and 114. Therefore, when the electronic circuit 20 transmits a signal having a frequency of several tens of MHz or more to the outside, the electronic circuit 20
And the coil 100 can be sufficiently tightly coupled to transmit the input signal and the output signal with little loss.

Next, an IC card 2 according to a first embodiment of the present invention, which is provided with a tuning circuit for the above-described IC card 1, will be described with reference to FIGS. I do. 4A and 4B are diagrams showing a configuration of the IC card 2 according to the present invention, wherein FIG. 4A shows a wiring pattern of the IC card 2, and FIG. 4B shows an equivalent when the electronic circuit 20 is used in the IC card 2. 3C shows an equivalent circuit when the electronic circuit 22 is used in the IC card 2. FIG.
FIG. 9 is a diagram showing a wiring pattern of an IC card 3 according to a modification of the IC card 2 shown in FIG.

As shown in FIG. 4A, the IC card 2
Has a configuration in which, in addition to the components of the IC card 1, a first conductive pattern 118 is provided to face the conductive pattern 116, and the electronic circuit 20 is replaced with an electronic circuit 22 as necessary. . As shown in FIGS. 4B and 4C, the conductive pattern 118 and the conductive pattern 116 form a tuning capacitor 120, and the tuning capacitor 120
Are connected in parallel to the coil 100 and the electronic circuits 20 and 22
And a tuning circuit tuned to the frequency of the input signal and the output signal. As described above, by forming a tuning circuit by the coil 100 and the tuning capacitor 120, the IC
The signal transmission distance of the card 2 can be extended.

As shown in FIG. 4C, the electronic circuit 22 is used in place of the electronic circuit 20. The electronic circuit 20 shown in FIG.
0 and a smoothing capacitor are added, and the current induced by the magnetic signal applied to the coil 100 is rectified by the rectifier circuit 224, and the stabilized power supply circuit 220
To stabilize the voltage and supply it to the electronic circuit 20. By configuring the electronic circuit 22 in this manner, power can be supplied to the electronic circuit 20 from the outside in the form of a magnetic signal, and the power supply 30 can be omitted, or an external power supply can be provided by using a secondary battery as the power supply 30. It becomes possible to charge from.

Further, the smoothing capacitor shown in FIG. 4C can be connected between the coupling capacitor 110 and the stabilized power supply circuit 220 and used as a smoothing capacitor of the stabilized power supply circuit 220. Since a microcomputer which consumes very little power is usually used for the electronic circuit 22, even if the tuning capacitor 120 is used as a smoothing capacitor, it is sufficient that the electronic circuit 22 has a capacitance of about 100 pF to 200 pF. As shown in FIG. 4A, the smoothing capacitor may be formed as a pattern of an IC card, or may be incorporated in the electronic circuit 22.

Hereinafter, a modified example of the IC card 2 will be described.
As shown in FIG. 5, the IC card 3 has a configuration in which the electronic circuit 20 and the coil 100 are connected to each other using the through holes 136 and 138 and the conductive pattern 116 to remove the coupling capacitor 110. The second tuning capacitor 120 is replaced with a tuning capacitor 130 composed of conductive patterns 118 and 116. Even with this configuration, the IC card 2 shown in FIG.
It is possible to realize a function equivalent to.

A modification in which the tuning frequency can be changed by changing the capacitance of the tuning capacitor 120 of the IC card 2 will be described below with reference to FIGS. 6 to 10, the conductive pattern 112 is omitted for simplification of the drawing. FIG. 6 is a diagram showing a configuration of a tuning capacitor 140 of a first modification of the tuning capacitor 120 of the IC card 2 shown in FIG.
(A) shows a method of adjusting the capacitance using the tuning capacitor 140, and (B) shows a change in the tuning frequency due to the adjustment of the capacitance.

The tuning capacitor 140 has a configuration in which the conductive pattern 118 of the tuning capacitor 120 shown in FIG. FIG. 6 (A)
As shown by a dotted line, by cutting the conductive pattern 144 arbitrarily, the capacitance of the tuning capacitor 140 can be changed. Therefore, the conductive pattern 144
Is cut along cutting lines a to c shown in FIG. 6A, so that the tuning frequency of the tuning circuit including the coil 100 and the tuning capacitor 140 is changed to, for example, the frequencies f _{a to} f _c shown in FIG. It can be adjusted as follows. By configuring tuning capacitor 140 in this manner, signals can be transmitted between electronic circuits 20, 22 and the outside under optimal conditions.

FIG. 7 shows a tuning capacitor 15 of a second modification of the tuning capacitor 120 of the IC card 2 shown in FIG.
FIG. 3 is a diagram showing a configuration of a zero. As shown in FIG. 7, the tuning capacitor 150 has a configuration in which the conductive pattern 114 of the tuning capacitor 120 shown in FIG. 4 is replaced with a conductive pattern 154, and the conductive pattern 154 has four capacitance adjustments. And connection patterns a to c for connecting between the capacitance adjustment patterns.

By cutting the connection pattern, it is possible to change the capacitance of the tuning capacitor 150 in three stages. As in the case of using the tuning capacitor 140 shown in FIG. Can be adjusted. Further, according to the conductive pattern 154, since the connection pattern connecting the capacitance adjustment pattern is thin, it is easy to cut, and the tuning circuit is easier to adjust than when the tuning capacitor 140 is used.

FIG. 8 shows a tuning capacitor 16 of a third modification of the tuning capacitor 120 of the IC card 2 shown in FIG.
FIG. 3 is a diagram showing a configuration of a zero. The capacitance of the tuning capacitor 150 shown in FIG. 7 can be adjusted only by 1/3 of the maximum capacitance. In such a rough adjustment, the tuning frequency may not be accurately adjusted. The IC card 160 shown in FIG. 8 is configured so that the capacitance can be adjusted more finely than the tuning capacitor 150.

As shown in FIG.
Has a configuration in which the conductive pattern 114 of the tuning capacitor 120 shown in FIG. 4 is replaced by a conductive pattern 164. The conductive pattern 164 includes four capacitance adjusting patterns having different areas, respectively. It is composed of connection patterns a to d for connecting between the capacitance adjustment patterns.

By cutting the connection patterns a to c, the capacitance of the tuning capacitor 160 can be changed, and the tuning frequency of the tuning circuit composed of the coil 100 and the tuning capacitor 160 can be adjusted. it can.
In addition, according to the conductive pattern 164, by selecting a connection pattern to be cut, the conductive pattern 154 can be formed.
It is possible to perform finer adjustment of the tuning circuit than in the case of using. For example, the area ratio of the capacitance adjusting pattern is 1:
Assuming 2: 4: 8, the capacitance of the IC card 160 is
It is possible to change to 15 steps in increments of 1/15 of the maximum capacitance.

FIG. 9 shows a tuning capacitor 17 of a fourth modification of the tuning capacitor 120 of the IC card 2 shown in FIG.
FIG. 3 is a diagram showing a configuration of a zero. As shown in FIG. 9, the tuning capacitor 170 has a configuration in which the conductive pattern 114 of the tuning capacitor 120 shown in FIG. 4 is replaced with a conductive pattern 174, and the conductive pattern 174 has a large area. The pattern 172 is composed of four capacitance adjustment patterns 176 having a small area, and connection patterns a to d connecting these capacitance adjustment patterns.

By cutting the connection patterns a to d, the capacitance of the tuning capacitor 170 can be changed in four stages.
Can be adjusted. The tuning capacitor 170 is suitable when the frequency change range may be relatively narrow when tuning the tuning circuit.

FIG. 10 shows a tuning capacitor 1 of a fourth modification of the tuning capacitor 120 of the IC card 2 shown in FIG.
FIG. 2 is a diagram illustrating a configuration of an 80. As shown in FIG. 10, the tuning capacitor 180 is the same as the tuning capacitor 12 shown in FIG.
0 is replaced with a conductive pattern 184. The conductive pattern 184 includes connection patterns a to g, four large capacity adjusting patterns 186, and a capacity adjusting pattern. One of the patterns 186
And four capacitance adjusting patterns 188 having a small area connected to each other.

By cutting the connection patterns a to g, the capacitance of the tuning capacitor 180 can be changed, and the tuning frequency of the tuning circuit composed of the coil 100 and the tuning capacitor 180 can be adjusted. it can.
The tuning capacitor 180 is suitable when the tuning circuit has a relatively wide frequency change range and precise adjustment is required.

Hereinafter, a second embodiment of the present invention will be described with reference to FIGS. FIG. 11 is a cross-sectional view when cutting the conductive pattern 144 shown in FIG.
(A) shows a state before cutting the conductive pattern 144,
(B) shows the state after the conductive pattern 144 is cut. FIG. 12 shows a tuning capacitor 40 according to the second embodiment.
FIG. 3 is a diagram showing a configuration of a zero. FIG. 13 is a diagram showing a modification of the tuning capacitor 400 shown in FIG.

As shown in FIG.
When using 0, 150, etc., to adjust the tuning circuit,
For example, when the conductive pattern 144 is cut using a cutter or the like at a portion indicated by an arrow a in FIG. 6A, as shown in a circle b in FIG. The pattern 116 may come into contact. Such contact between the conductive patterns 144 and 116 may cause malfunction of the IC card.

Therefore, for example, the tuning capacitors 140 and 150 shown in FIGS. 6 and 7 are replaced with a tuning capacitor 400 shown in FIG. The tuning capacitor 400
For example, the conductive pattern 116 of the tuning capacitor 150
To the conductive pattern 1 which is cut during the tuning of the tuning circuit.
The conductive pattern 40 provided with the insulating regions 408a to 408c excluding the conductive material at the back of the connection pattern
2 is replaced. By using the tuning capacitor 400 shown in FIG. 12, it is possible to prevent contact between the conductive patterns as shown in FIG.

A tuning capacitor 410 will be described below as a modification of the tuning capacitor 400. As shown in FIG. 13, the tuning capacitor 410 includes four capacitance adjustment patterns 414 a to 414 d which are not connected and the conductive pattern 116.
The tuning circuit is adjusted by connecting these capacitance adjustment patterns with conductive paints 418a and 418b, contrary to the case of using. When the tuning circuit is adjusted by using the tuning capacitor 410, the connection pattern is not cut off as in the case of using the tuning capacitor 400, so that the contact between the conductive patterns as shown in FIG. Does not occur.

The components of the IC card described in each of the embodiments described above can be freely combined and used as far as possible. The shape and the like of the conductive pattern of the tuning capacitor shown in each embodiment are merely examples, and can be changed to other shapes that can realize the same function and performance. In addition to the embodiments described above, the IC card according to the present invention can have various configurations, for example, as shown in the modifications described herein.

[0040]

As described above, according to the IC card according to the present invention, a tuning circuit using a coil composed of a conductive pattern is realized without using individual components such as a chip capacitor. Can be reduced, and I
The reliability of the C card can be improved.

[Brief description of the drawings]

1A and 1B are diagrams showing a configuration of an IC card applied to the present invention, wherein FIG. 1A shows the configuration of an IC card, and FIG.
4 shows an equivalent circuit of the C card.

FIG. 2 is a diagram showing a wiring pattern of the IC card shown in FIG.

3A and 3B are diagrams showing a configuration of a coupling capacitor of the IC card shown in FIGS. 1 and 2, wherein FIG. 3A shows a wiring pattern of the coupling capacitor as viewed from the surface, and FIG. It is a cross-sectional view cut in the -X 'direction,
(C) and (D) show equivalent circuits of the coupling capacitor.

4A and 4B are diagrams showing a configuration of an IC card according to the first embodiment of the present invention, wherein FIG. 4A shows a wiring pattern of the IC card, and FIG. (C) shows an equivalent circuit when an electronic circuit is used for the IC card 2.

FIG. 5 is a diagram showing a wiring pattern of a modification of the IC card shown in FIG. 4;

6A and 6B are diagrams showing a configuration of a first modification of the tuning capacitor of the IC card shown in FIG. 4, wherein FIG. 6A shows a method of adjusting the capacitance using the tuning capacitor, and FIG. Indicates a change in the tuning frequency due to the adjustment of the capacitance.

FIG. 7 is a diagram showing a configuration of a second modification of the tuning capacitor of the IC card shown in FIG. 4;

FIG. 8 is a diagram showing a configuration of a third modification of the tuning capacitor of the IC card shown in FIG. 4;

FIG. 9 is a diagram showing a configuration of a fourth modification of the tuning capacitor of the IC card shown in FIG. 4;

FIG. 10 is a diagram showing a configuration of a fourth modification of the tuning capacitor of the IC card shown in FIG. 4;

11A and 11B are cross-sectional views when the conductive pattern shown in FIG. 6 is cut, in which FIG. 11A shows a state before cutting the conductive pattern, and FIG. 11B shows a state after cutting the conductive pattern.

FIG. 12 is a diagram illustrating a configuration of a tuning capacitor according to a second embodiment.

FIG. 13 is a diagram showing a modification of the tuning capacitor shown in FIG.

FIG. 14 is a diagram showing a wiring pattern of a conventional first IC card.

15A and 15B are diagrams showing a configuration of a conventional second IC card, wherein FIG. 15A is a perspective view of the conventional second IC card, and FIG. 15B is a configuration of the conventional second IC card. Indicates that
(C) is an equivalent circuit of the second conventional IC card.

16 is a diagram illustrating a wiring pattern of the second conventional IC card shown in FIG. 15;

[Explanation of symbols]

1, 2, 3, 4 ... IC card, 100 ... coil, 110
... Coupling capacitors, 112, 114, 116, 118,
144, 154, 164, 172, 174, 184, 4
02, 414: conductive pattern, 408: insulating region, 4
18 conductive paint, 120, 130, 140, 150,
160, 170, 180, 400, 410 ... tuning capacitors, 176, 186, 188 ... capacity adjustment patterns,
136, 138 through hole, 20, 22 electronic circuit, 200 modulation / demodulation circuit, 202 microprocessor, 204 switch, 206 switch, 208 addition circuit, 210 display device, 212 display device, 214
... Access control circuit, 220 ... Stabilized power supply circuit, 224
... Rectifier circuit, 30 ... Power supply, 32 ... Substrate

Claims (7)

[Claims] 1. A coil provided as a conductor on one surface of a substrate of the IC card, and two signals provided on the same surface of the substrate as the coil and corresponding to both ends of the coil, respectively. Terminals are coupled to both ends of the coil, an electronic circuit for receiving and transmitting signals to and from the outside by electromagnetic action via the coil, or any of these, and on the same side of the board as the coil. A first conductor provided on a surface and connected to one end of the coil; a first conductor provided on a surface of the substrate opposite to the coil and coupled to the other end of the coil; An IC card having a predetermined capacitance between the first and second substrates and a second conductor constituting a tuning circuit having a predetermined resonance frequency together with the coil. 2. The IC card according to claim 1, wherein the other end of the coil is connected to the second conductor provided on a surface opposite to the substrate by using a through hole. . 3. The method of adjusting the resonance frequency of the tuning circuit includes cutting the first conductor at an arbitrary position and cutting the capacitance between the first conductor and the second conductor. 3. The IC card according to claim 2, wherein the IC card is changed. 4. The first conductor is composed of a plurality of capacitance adjusting conductors and a connecting conductor connecting between the capacitance adjusting conductors, and cutting the connecting conductor. The IC card according to claim 2, wherein the resonance frequency of the tuning circuit is adjusted by changing the capacitance of the tuning circuit. 5. The semiconductor device according to claim 4, wherein the second conductor has an insulating region at a position where the connection conductor of the first conductor faces the substrate via the substrate. I described
C card. 6. The tuning according to claim 1, wherein the first conductor comprises a plurality of non-connected capacitance adjusting conductors, and the capacitance adjusting conductor is connected by a connection conductor or a conductive paint. The IC card according to claim 2, wherein the capacitance of the circuit is adjusted. 7. The second conductor provided on a surface of the substrate opposite to the coil, wherein the second conductor is located at a position where the connection conductor of the first conductor faces through the substrate. 5. The IC card according to claim 4, wherein said IC card has a shape without said second conductor.