JP3064840B2 - IC card - Google Patents

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 a signal to and from the outside through a coil provided as a conductor on a substrate.

[0002]

2. Description of the Related Art Conventionally, an I-type device having a structure 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 respond to such a request, an IC card 8 as shown in FIG. 14 has been proposed. As shown in FIGS. 14A and 14B, the IC card 8 has a coil 80 with two windings, 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
Equivalent circuit of C card 8 is as shown in FIG. 14 (C). The conductive pattern of the coil 80 of the IC card 8 shown in FIG. 14 provided along the outer periphery of the substrate 32, shown in FIG. 15 the configuration of the IC card 8 having an increased area of the coil 80.

[0004]

However, when the wiring pattern is crossed using the through hole and the back surface pattern 84 as in the above-described IC card 8, the I
As compared with the case of the C card 7, the number of manufacturing steps increases by these amounts. Other, as a method for connecting the coil 80 and electronic circuit 20 without using the through holes, for example, an insulating layer on the coil 80 is provided, but it is thought a method of providing a further conductive pattern thereon, the Even if the method is adopted, the number of manufacturing steps is still increased.

On the other hand, there is a demand to improve the efficiency of signal transmission by connecting a capacitor in parallel to the coil 80 of the IC card 8 and forming a tuning circuit for tuning to the frequency of the signal input / output by the electronic circuit 20. is there. There is also a demand that the current induced in the tuning circuit of the IC card be rectified and supplied to the electronic circuit 20 .

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art, and has a coil formed of a conductive pattern and having more than one winding, and is provided between the both ends of the coil and an electronic circuit. It is an object of the present invention to provide an IC card capable of connecting between them without using a back surface pattern and a through hole .

[0007]

In order to solve the above-mentioned problems, an IC card according to the present invention comprises a coil having more than one coil provided as a conductor on one surface of a substrate of the IC card. And two signal terminals provided on the same side of the substrate as the coil and respectively coupled to both ends of the coil, one of these signal terminals being connected to one end of the coil, An electronic circuit for receiving and transmitting signals to and from the outside by electromagnetic action through, or any of these, is provided on the same surface of the substrate as the coil, and connected to the other end of the coil A first conductor provided on a surface of the substrate on the same side as the coil, a second conductor connected to the other of the signal terminals, and a second conductor provided on a surface of the substrate opposite to the coil. The first conductive member provided And a third conductor that has a predetermined capacitance between the second conductor and the second conductor via the substrate and couples the other end of the coil and the other signal terminal of the electronic circuit. Have.

Preferably, a fourth terminal is provided on a surface of the substrate on the same side as the coil, and one of signal terminals of the electronic circuit is connected to a fourth terminal.
And a predetermined capacitance between the third conductor and the third conductor via the substrate, and forms a tuning circuit having a predetermined resonance frequency with the coil. Specifically, the resonance frequency of the tuning circuit is adjusted by cutting the fourth conductor at an arbitrary position and setting the capacitance between the fourth conductor and the third conductor. Is done by changing More specifically, the fourth conductor is composed of a plurality of capacitance adjusting conductors and a connecting conductor connecting between the capacitance adjusting conductors, and disconnects the connecting conductor. Then, the resonance frequency of the tuning circuit is adjusted by changing the capacitance of the tuning circuit.

Preferably, the third conductor is the fourth conductor.
An insulating region is provided at a position where the conductor for connection of the conductor faces the substrate via the substrate. More specifically, the fourth conductor is composed of a plurality of non-connected capacitance adjusting conductors, and the capacitance adjusting conductor is connected by a connection conductor or a conductive paint to form the fourth conductor. The capacitance of the tuning circuit is adjusted. More preferably, the third conductor provided on a surface of the substrate opposite to the coil is located at a position where the connection conductor of the fourth conductor faces through the substrate. Has a shape without the third conductor.

[0010]

The coil has more than one winding and is provided as a conductor on one surface of the substrate of the IC card. The electronic circuit is provided on the same side of the substrate of the IC card as the coil, and has two signal terminals coupled to both ends of the coil.
One of these signal terminals is connected to one end of the coil. The electronic circuit, for example, by turning on / off a current induced in the coil by a magnetic field applied from the outside,
A signal is received and / or transmitted to / from the outside by using an electromagnetic action.

The first conductor is provided on the same surface (front surface) of the substrate of the IC card as the coil, and is connected to the other end of the coil. The first conductor is provided on the surface of the IC card and connected to the other of the signal terminals. The third conductor is provided on the surface (rear surface) of the substrate of the IC card opposite to the coil, and a predetermined static electricity is provided between the first conductor and the second conductor via the substrate. Generates capacitance. First to third
The conductor couples the other end of the coil and the other of the signal terminals of the electronic circuit by this capacitance.

[0012]

Embodiment 1 Hereinafter, a first embodiment of the present invention will be described with reference to FIGS.
An example will be described. FIG. 1 is a diagram showing a configuration of an IC card 1 according to the present invention in a first embodiment,
(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.

As shown in FIG. 1A, a coil 100,
It is composed of a coupling capacitor 110, an electronic circuit 20, and a power supply 30, and its equivalent circuit is as shown in FIG. The electronic circuit 20 includes a microprocessor 20
2. It comprises 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 the 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 is 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 wiring pattern shape.
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, referring to FIGS. 2 and 3, I
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 inside the coil 100 on the same side (surface) as 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 first conductive pattern 112 is provided at the second terminal b of the coil 100, and the electronic circuit 20
A second conductive pattern 114 is provided on the GND-side power supply terminal of the substrate 32, and the conductive patterns 114, 1 on the rear surface of the substrate 32 are provided.
The third conductive pattern 116 is provided on the rear side of the portion 16.

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.

[0021]

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.

[0023]

Second Embodiment Hereinafter, with reference to FIGS. 4-9, illustrating a second embodiment of the present invention. FIG. 4 is a diagram showing a configuration of the IC card 2 according to the present invention in the second embodiment,
(A) shows a wiring pattern of the IC card 2, (B) shows an equivalent circuit when the electronic circuit 20 is used for the IC card 2, and (C) shows an equivalent circuit when the electronic circuit 22 is used for the IC card 2. An equivalent circuit is shown .

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 fourth conductive pattern 118 is provided so as 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 to be 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.

Referring to FIGS . 5 to 9 , a description will be given of a modification in which the tuning frequency can be changed by changing the capacitance of the tuning capacitor 120 of the IC card 2. FIG. FIG.
9 to 9 , the conductive pattern 112 is omitted for simplification of the drawing. FIG. 5 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. 5 (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
Are joined by the cutting lines a to c shown in FIG. 5A, so that the tuning frequency of the tuning circuit composed of the coil 100 and the tuning capacitor 140 is changed to, for example, the frequencies f _{a to} f shown in FIG. It can be adjusted as _c . By configuring tuning capacitor 140 in this manner, signals can be transmitted between electronic circuits 20, 22 and the outside under optimal conditions.

FIG . 6 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. 6 , 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 d for connecting between these 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 . 7 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. 6 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. 7 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 . 8 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. 8 , 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 for 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 . 9 shows a tuning capacitor 18 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 180 has a configuration in which the conductive pattern 114 of the tuning capacitor 120 shown in FIG. 4 is replaced with a conductive pattern 184, and the conductive pattern 184 has connection patterns a to g, four capacitance adjustment patterns 186 having a large area, and four capacitance adjustment patterns 18 having a small area connected to one of the capacitance adjustment patterns 186.
And 8.

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.

[0038]

Third Embodiment Hereinafter, a description will be given of a third embodiment of the present invention with reference to FIGS. 10 to 12. Figure 10 is a cross-sectional view when cutting the conductive pattern 144 shown in FIG. 5,
(A) shows a state before cutting the conductive pattern 144,
(B) shows the state after the conductive pattern 144 is cut. Figure
FIG. 11 is a diagram showing a configuration of a tuning capacitor 400 in the third embodiment. FIG. 12 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, FIG. 5 when the conductive pattern 144 at a portion indicated by an arrow a in (A) to cut with a cutter or the like, as shown in the circle b of FIG. 5 (B), the conductive pattern 144 and conductive rear surface thereof 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 . 5 and 6 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. 11 , 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. 12 , 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 shown 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 examples, and can be changed to other shapes that can realize the same function and performance. ICs according to the present invention, in addition to those shown in the embodiments described above.
The card is, for example, as shown in the variant described here,
Various configurations can be taken.

[0043]

As described above, according to the IC card of the present invention, the IC card is constituted by the conductive pattern and has one turn.
While having more coils, the both ends of the coil and the electronic circuit can be connected without using a back surface pattern and a through hole .

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of an IC card according to a first embodiment of the present invention, wherein (A) shows the configuration of the IC card, and (B) shows an equivalent circuit of the IC 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 present invention in a second embodiment, wherein FIG. 4A shows a wiring pattern of the IC card, and FIG. 4B shows a case where an electronic circuit is used for the IC card; (C) shows an equivalent circuit when an electronic circuit is used for the IC card 2.

FIG. 5 shows a tuning capacitor of the IC card shown in FIG . 4;
FIG. 6 is a diagram showing a configuration of a modification example of FIG.
The method of adjusting the capacitance using a capacitor is shown.
4 shows a change in tuning frequency due to adjustment of capacitance.

FIG. 6 illustrates a tuning capacitor of the IC card shown in FIG . 4;
FIG. 11 is a diagram illustrating a configuration of a modification example 2;

FIG. 7 shows a tuning capacitor of the IC card shown in FIG . 4;
FIG. 14 is a diagram illustrating a configuration of a modification example 3;

FIG. 8 shows a tuning capacitor of the IC card shown in FIG . 4;
FIG. 14 is a diagram illustrating a configuration of a modification example 4;

FIG. 9 shows a tuning capacitor of the IC card shown in FIG . 4;
FIG. 14 is a diagram illustrating a configuration of a modification example 4;

FIG. 10 shows a case where the conductive pattern shown in FIG . 6 is cut.
FIG. 3A is a cross-sectional view of FIG.
(B) shows the state after cutting the conductive pattern.

FIG. 11 shows a configuration of a tuning capacitor according to a third embodiment .
FIG.

FIG. 12 shows a modification of the tuning capacitor shown in FIG .
FIG.

FIG. 13 shows a wiring pattern of a conventional first IC card.
FIG.

FIG. 14 is a diagram showing a configuration of a conventional second IC card.
(A) is a perspective view of a second conventional IC card.
(B) shows the configuration of a conventional second IC card,
(C) is an equivalent circuit of the second conventional IC card.

FIG. 15 shows an arrangement of the conventional second IC card shown in FIG .
It is a figure which illustrates a line pattern.

16 is a diagram showing a shape of a conductive pattern on the back side of the electronic circuit and the conductive pattern shown in FIG. 14 when viewed from the front surface side.

FIG. 17 is a view showing a state in which the IC card shown in FIG. 14 is bent at both ends of a cut.

FIG. 18 is a diagram showing a wiring pattern of a conventional first IC card.

19A and 19B are diagrams showing a configuration of a conventional second IC card, wherein FIG. 19A is a perspective view of the conventional second IC card, and FIG. 19B is a configuration of the conventional second IC card. Indicates that
(C) is an equivalent circuit of the second conventional IC card.

20 is a diagram illustrating a wiring pattern of the second conventional IC card shown in FIG. 19;

[Explanation of symbols]

1,2,3,4 ... IC card, 100, 1 10 ... coupling capacitor, 112,114,116,118,144,
154, 164, 172, 174, 184, 402, 4
14 : conductive pattern, 408: insulating region, 418: conductive paint, 120, 130, 140, 150, 160,
170, 180, 400, 410 ... tuning capacitors, 1
76, 186, 188 ... capacity adjustment pattern, 136
138: through-hole, 20, 22: electronic circuit, 200
... Modulation / demodulation circuit, 202 ... Microprocessor, 204 ...
Switch, 206: switch, 208: adder circuit, 21
0: display device, 212: display device, 214: access control circuit, 220: stabilized power supply circuit, 224: rectifier circuit,
30 ... power supply, 32, 34 ... based on plate

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-4-321190 (JP, A) JP-A-62-157413 (JP, A) JP-A-4-78812 (JP, U) (58) Survey Field (Int.Cl. ⁷ , DB name) G06K 19/07 G06K 19/077 H01Q 7/00 H01F 5/04

Claims (7)

(57) [Claims] A coil having more than one coil provided as a conductor on one surface of a substrate of the IC card; and a coil provided on the same surface of the substrate as the coil, and provided at both ends of the coil. It has two signal terminals to be coupled, one of these signal terminals is connected to one end of the coil, and receives and transmits signals to and from the outside by electromagnetic action through the coil, or An electronic circuit that performs any of the following: a first conductor provided on the same surface of the substrate as the coil and connected to the other end of the coil; and an electronic circuit provided on the same surface of the substrate as the coil. A second conductor connected to the other of the signal terminals; and a second conductor provided on a surface of the substrate opposite to the coil, wherein the second conductor is disposed between the first conductor and the second conductor. Having a predetermined capacitance through the substrate, An IC card comprising: a third conductor that couples the other end of the coil and the other signal terminal of the electronic circuit. 2. A circuit according to claim 1, further comprising a fourth conductor provided on a surface of the substrate on the same side as the coil and having one of signal terminals of the electronic circuit, wherein the fourth conductor is provided between the substrate and the third conductor. 2. A circuit according to claim 1, wherein said coil has a predetermined capacitance and forms a tuning circuit having a predetermined resonance frequency together with said coil.
C card. 3. The method of adjusting the resonance frequency of the tuning circuit includes cutting the fourth conductor at an arbitrary position and cutting the capacitance between the fourth conductor and the third conductor. 3. The IC card according to claim 2, wherein the IC card is changed. 4. The fourth conductor comprises a plurality of capacitance-adjusting conductors and a connection conductor for connecting these capacitance-adjustment conductors, and cuts the connection 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 third conductor has an insulating region at a position where the connection conductor of the fourth conductor faces through the substrate. I described
C card. 6. The tuning according to claim 4, wherein the fourth conductor is composed of 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 third conductor provided on a surface of the substrate opposite to the coil, wherein the third conductor is located at a position where the connection conductor of the fourth conductor faces through the substrate. 5. The IC card according to claim 4, wherein said IC card has a shape without said third conductor .