JP2001010264A - Non-contact type ic card and method for regulating antenna characteristics - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a non-contact type IC card containing regulating capacitor and resistor to regulate a sharpness of a resonance circuit by regulating a resistance value in the circuit and a method for regulating its antenna characteristics. SOLUTION: This non-contact type IC card communicates with an external reader/writer in a non-contact manner. In this case, the IC card has a resonance circuit having an antenna coil 13 and a planar regulating resistor in a card base, and can assure a good communicating state by regulating a sharpness Q of the circuit by regulating a resistance value of the regulating resistor 14 in the circuit. A regulating capacitor 15 is provided, and a resonance frequency (f) can be regulated. Antenna characteristic regulation of the IC card can be conducted by regulating the sharpness Q by cutting a part of a plurality of the circuits provide by branching from the antenna coil.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a non-contact type IC card which performs non-contact communication by electromagnetic induction and electromagnetic coupling, and a method of adjusting antenna characteristics thereof. More specifically, in a non-contact type IC card in which an antenna coil, a planar capacitor, and a resistor are built in a base, a resonance frequency can be adjusted within a certain range to match a frequency of a reader / writer, and a sharpness can be adjusted to improve a resonance frequency. The present invention relates to a non-contact type IC card capable of obtaining a communication state and capable of adjusting a resistance component of a resonance circuit, and an antenna characteristic adjusting method thereof.

[0002]

2. Description of the Related Art There are the following three types of antenna coils built in a non-contact IC card. (1) Winding method A wire covered with an insulating material and wound several to several tens of times. Basically, since both ends of the antenna are directly connected to the terminal portion of the IC chip, there is no example in which an additional function processing of an adjustable capacitor is performed. (2) Method using conductive paste This is a material in which particles such as silver are contained in a silk screen ink or the like to have conductivity. This is printed in an antenna shape by the same method as silk printing. In general, a conductive adhesive, an anisotropic conductive film, or the like is used to connect both ends of the antenna to the terminals of the IC chip. Also in this case, there is no example in which the additional function processing of the adjustable capacitor is performed. (3) Etching method In this method, a copper foil or the like is vapor-deposited on a base material, and a portion of the copper foil excluding the antenna portion is removed by etching to form an antenna. In general, a conductive adhesive, an anisotropic conductive film, or the like is used to connect both ends of the antenna to the terminals of the IC chip. In this case, there is an example in which the additional function processing of the capacitor is performed.

However, the above-described IC cards have the following problems. (1) Winding method Since the cross-sectional area of the antenna is large and the resistance is small, the sharpness (Q) of the resonance circuit, which is inversely proportional to the resistance R, tends to increase as shown in (Equation 1) below. In this case, good communication can be performed in a state where the resonance frequency matches between the card and the reader / writer (R / W). However, even if the resonance frequency is slightly deviated, there is a high possibility that communication cannot be performed. Therefore,
As Q increases, the matching range with R / W becomes narrower. The sharpness (Q) is represented by a function of the inductance (L), the capacitance (C), and the resistance component (R) of the antenna coil. It is difficult to use ICs that use the same
Even with a chip (for example, ISO14443: CD), it is necessary to design an antenna for matching R / W for each different manufacturer, which causes a problem that a delivery date cannot be reached and a cost increases. In the case of a non-contact type IC card, a parallel resonance circuit is formed, and the sharpness (Q) in this case is expressed by the following (Equation 1). Q = (1 / R) × (√C) × (1 / √L) (Equation 1)

(2) Method using conductive paste In the case of conductive paste, the sharpness of the resonance circuit tends to be small because the antenna resistance is large. As Q becomes smaller, the matching range with R / W becomes wider, but it is more likely that the minimum voltage required to operate the IC chip cannot be obtained. The sharpness Q is determined by the inductance (L) and the capacitance (C) of the antenna coil as described above (Equation 1).
And the resistance component (R), but it is difficult to adjust L and C by using a method using a conductive paste, and it is necessary to match R / W for different manufacturers. It is necessary to design the antenna in the same way, and there are problems of delivery time and cost as in the case of the winding method.

(3) Etching method The resistance of the antenna is located in the middle of the above two types, and the sharpness (Q) of the resonance circuit is halfway. The matching range with R / W is neither wide nor narrow. An external capacitor can be provided to increase Q, and the external capacitor can be removed to reduce Q. However, if (Q) is changed by changing the capacitance of the capacitor, the resonance frequency (f) shown by the following (Equation 2) changes, and it may not be possible to obtain compatibility with R / W. There is. f (Hz) = (1 / 2π) × (1 / √ (LC)) (Equation 2)

[0006]

Therefore, in the present invention,
Of the above three types of antennas, the antenna with the most flexible etching method has an additional function, and after a predetermined suitable resonance frequency is obtained, the Q value is changed without changing the resonance frequency. Contactless IC
Provide cards and how to adjust them. Thereby, R / W
Antenna characteristics can be easily matched, and an IC card having a highly versatile antenna can be supplied.

[0007]

A first aspect of the present invention to solve the above-mentioned problem is a non-contact type IC card which can communicate with an external reader / writer in a non-contact manner. A resonance circuit including an antenna coil and a planar adjustment resistor is provided, and by adjusting the resistance value of the adjustment resistor in the resonance circuit, the sharpness (Q) of the resonance circuit is adjusted to achieve a good communication state. A non-contact type IC card characterized in that it can be secured. Since such a non-contact type IC card is used, it is possible to adjust the sharpness and secure a good communication state.

A second aspect of the present invention for solving the above-mentioned problem is a non-contact type IC card which can communicate with an external reader / writer in a non-contact manner. It has a resonance circuit including an adjustment capacitor, and by adjusting the capacitance of the capacitor in the resonance circuit, it is possible to adjust the resonance frequency (f) of the resonance circuit to ensure a good communication state. A non-contact type IC card. Such non-contact type I
Since it is a C card, the resonance frequency can be adjusted by adjusting the capacitance of the capacitor.

A third aspect of the present invention for solving the above-mentioned problem is a non-contact type IC card which can communicate with an external reader / writer in a non-contact manner. A resonance circuit including an adjustment capacitor and an adjustment resistor is provided, and the resonance frequency (f) and the sharpness (Q) of the resonance circuit are adjusted by adjusting the capacitance and resistance of the capacitor in the resonance circuit. A non-contact type IC card characterized in that a communication state can be ensured. Since such a non-contact type IC card is used, the resonance frequency can be adjusted by adjusting the capacitor capacity, and the sharpness can be adjusted to ensure a good communication state.

A fourth aspect of the present invention for solving the above-mentioned problem is that a card substrate includes an antenna coil formed by a photo-etching method, a planar adjusting capacitor, and an antenna-containing substrate including an adjusting resistor. In the non-contact type IC card, the sharpness (Q) of the resonance circuit can be adjusted by adjusting the resistance value of the adjusting resistor. Since such a non-contact type IC card is used, it is possible to adjust the sharpness and secure a good communication state.

A fifth aspect of the present invention for solving the above problems is a method of adjusting the antenna characteristics of a non-contact IC card having a resonance circuit including an antenna coil and a planar adjustment resistor in a card base. An antenna characteristic adjustment method characterized in that the sharpness (Q) of a resonance circuit is adjusted by cutting a part of a plurality of circuits branched from an antenna coil. With this method of adjusting antenna characteristics, the sharpness (Q) can be easily adjusted.

A sixth aspect of the present invention for solving the above problems is a method for adjusting the antenna characteristics of a non-contact IC card having a resonance circuit including an antenna coil and a planar adjusting capacitor in a card base. An antenna characteristic adjustment method characterized in that a resonance frequency (f) of a resonance circuit is adjusted by cutting a part of a plurality of adjustment capacitors provided in an antenna coil. With this method of adjusting antenna characteristics, the resonance frequency (f) can be easily adjusted.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention is to match a non-contact type IC card with a R / W and adjust antenna characteristics to obtain a good communication state. Specifically, even if the capacitor is adjusted or not adjusted, after the predetermined resonance frequency with R / W is obtained, the sharpness (Q) is adjusted by adjusting the resistance component without changing the resonance frequency. To change it. In general, if the capacitance of the IC chip as the LSI and the capacitance of the card antenna circuit are constant and invariable with respect to the resonance frequency of the R / W, it is not necessary to provide an adjusting capacitor. Capacity: C
_1, the card antenna circuit capacity: variation in the C _2. When there is no variation between the two, the effect as in the initial design can be expected. However, in practice, the variation cannot be ignored due to the lot-to-lot and individual differences. Therefore in the actual production, it becomes necessary to adjust the value of C _2. This is the step of obtaining a predetermined resonance frequency. Also, if the sharpness (Q) is not appropriate even if the resonance frequency is obtained, good communication cannot be performed. Such adjustment of the antenna characteristics is performed on the substrate with the antenna in the card manufacturing process so that the antenna has a certain characteristic, and then the oversheet is laminated to complete the non-contact IC card.

Hereinafter, embodiments of the non-contact type IC card of the present invention will be described with reference to the drawings. FIG. 1 is a plan view showing an embodiment of a substrate with an antenna used for a non-contact type IC card of the present invention. FIG. 1A is a plan view as viewed from the IC chip mounting side, and FIG. 1B is a view as seen through the surface opposite to the IC chip mounting side from the surface.
As shown in FIG. 1, the antenna-equipped substrate 121A is formed in a plurality of imposition states on a vinyl chloride or polyethylene terephthalate (PET) resin sheet as a base material of the card. In the drawing, reference numeral 101 denotes a register mark for punching, which is cut along a dotted line 102 after lamination with an oversheet to finish each card. Although the entire IC card after completion is not shown, the IC chip and the antenna coil are embedded in the card base, so that the external appearance is a flat card body, and the surface is provided as required. A print design or the like is provided.

An antenna coil 13 is formed on each surface of the substrate with antenna 121A. One end of the antenna coil is connected to the IC chip 11 which is an LSI, and the other end is connected to the wiring 13B on the back surface through the through hole 131.
It is connected to the IC chip 11 through the through hole 132. The feature of the non-contact IC card of the present invention is that a resistor 14 for adjusting a resistance value (R component) and a capacitor 15 for adjusting a capacitance (C component) which form a parallel resonance circuit in an antenna circuit are formed on a substrate with an antenna. It is in. Although the adjusting resistor 14 can adopt various forms, in the case of FIG. 1, a ladder-shaped circuit branched from the antenna coil 13 is formed in eight stages. Although the adjusting capacitor 15 can be formed in various forms, in the case of FIG.
By providing 1,152 on the front and back surfaces of the antenna-equipped substrate, a capacitor is formed. Therefore, in this case, the base sheet is formed as a dielectric layer. When adjusting the capacitance of the capacitor, the circuit is cut from the tip of the adjusting capacitor (between two points sandwiching the circuit).

In general, in a card antenna circuit (parallel resonance circuit), an IC chip as an LSI is
It has a C component of pF, and the C component of the coil itself can be regarded as substantially zero or zero. In addition, coil (3-4 turns)
Is about 1 to 4 μH. Therefore, unless the capacitance of the LSI greatly varies, the adjustment range does not need to be excessively large. In order to adjust the resonance frequency of the commonly used non-contact IC card, the C of the adjustment capacitor is required.
It is considered sufficient if the total amount of the components is about 40 to 100 pF.

In the case of FIG. 1, the capacitor pattern is formed as a flat plate-like pattern via a base material sheet. However, the present invention is not limited to this example. You may. Also, instead of using the base material sheet as a dielectric layer, after forming a capacitor pattern on one surface of the antenna-equipped substrate, a dielectric layer serving as an insulating layer is applied in a thin film form by applying a flat plate, A capacitor may be formed by forming a conductive layer on the dielectric layer. The adjustable capacitance depends on the layer configuration of the capacitor (2
If the capacitance per unit area is determined by the distance between the two electrode plates) and the material (dielectric constant of the dielectric), the adjustment unit amount is determined by the area of the flat or comb-shaped pattern. The size of the pattern is adjusted stepwise, and a capacitance of about 0.1 pF to about 100 pF can be arbitrarily provided depending on the combination.

FIG. 2 is a diagram showing a method of adjusting the adjusting resistor. When the resistance value is adjusted, the entire ladder-shaped adjustment resistance pattern 141 is cut at any one of the cutting lines 14C ₁ , 14C ₂ ,..., 14Cn in accordance with the necessary adjustment resistance value. Can be adjusted. If the resistance pattern can be formed into a shape having a substantially constant line width and line length, a change in resistance value due to a cut portion can be predicted (calculated). Therefore, the Q value can be calculated from (Equation 1) and adjusted to predetermined characteristics. it can. The cutting may be performed by a cutting tool such as a cutter or a method of mechanically cutting using a cutting die.

FIG. 3 is a diagram showing an equivalent circuit of a substrate with an antenna. With respect to the IC chip 11 which is an LSI, the inductance L of the antenna coil 13, the resistance R and the adjustment resistance Rad of the whole circuit, the capacitance C of the whole circuit such as the capacitance based on the IC chip and the stray capacitance generated in the circuit. A parallel resonance circuit is formed by the adjusting capacitor Cad.

Here, the parallel circuit resonates when the impedance Z (Equation 3) is apparently maximum, that is, when the complex number component becomes 0, from which the resonance frequency can be derived (Equation 4). , Equation 5). Note that ω
_c is the angular resonant frequency, f _c denotes a resonance frequency. Z = 1 / _{[1 / R + i (ω c} C- (1 / ω c L)) ] (Equation _{3) ω c = 1 / (} LC) 1/2 = 2πf c ( Equation 4) f _c = 1 / ( 2π (LC) ^1/2 ) (Equation 5) [Equation 5 is the same as the above-mentioned (Equation 2). C at this time is the capacitance of the entire circuit at the time of resonance, and when this is derived, C = 1 / ((2πf) ² L) (Equation 6). For example, substituting the values when the resonance frequency is 13.56 MHz and the coil is 3.0 μH, C = 4
6.0 pF is required. Therefore, the C component of the LSI is
In the case of 40 pF, Cad is 6.0 pF
Is required.

Next, the antenna characteristic adjusting method of the present invention will be described with reference to a method of manufacturing a non-contact IC card. FIG.
FIG. 3 is a diagram illustrating a manufacturing process of the non-contact type IC card of the present invention. FIG. 4 illustrates a case of a three-card structure, but the card base may have four or more layers, and is not limited to the three-card structure.

(1) <Formation of Substrate with Antenna> First, a glass epoxy substrate, polyimide, vinyl chloride, polyethylene terephthalate (PET), PET-
A base sheet 121 is prepared in which a copper foil 121c is laminated on both surfaces of a resin base 121i such as G. Copper foil 121c is 10
Those formed to a thickness of about 30 μm are preferable. Next, the antenna coil 13, the antenna coil connection terminal, the adjusting resistor 14, the adjusting capacitor 15, and the like are formed by photo-etching a copper foil to prepare a substrate 121A with an antenna.

The adjusting capacitor 15 has a capacitor pattern 151 having a unit adjusting capacity connected in series as shown in FIG.
Can be adopted. In the design concept of FIG. 1, the unit adjustment amount is 5.0 pF when the area of one adjustment capacitor pattern is 10 mm ² , and the total adjustment amount is about 40 pF for eight adjustment capacitor patterns. However, the capacitance is affected not only by the size of the capacitor pattern but also by the dielectric constant and thickness of the base material 121i, which is an insulating layer. Therefore, it is necessary to sufficiently consider these factors. The adjusting resistor 14 can be formed so as to form a plurality of circuits branched from the antenna coil 13. In the case of FIG. 1, it is formed as a ladder-like circuit. The adjusting resistor 14 is not limited to the ladder shape, and various types can be adopted.

(2) <IC Chip Mounting, Capacitor Capacitance, Resistance Value Adjustment> Next, the IC chip 1 is mounted on the antenna-equipped substrate 121A.
1 is implemented. Since the IC chip can be mounted on the substrate with the antenna in a planar manner, the anisotropic conductive film (A
A flip-chip mounting method using CF) can be preferably employed. When mounting with an ACF, a method is used in which a temporary attachment is performed by aligning with a pad of an IC chip on the connection terminal of the antenna coil via the ACF, and then applying heat and pressure to perform final bonding.

After mounting the IC chip, module tuning is performed. Specifically, this is adjustment of antenna characteristics for matching with R / W, and an operation of disconnecting the circuit to reduce the capacitance and resistance of the adjustment capacitor 15 and the adjustment resistor 14 is performed. In the case of the present invention, it is not possible to adjust the direction of increasing the capacitance or the resistance of the capacitor, so that the direction of the increase is reduced. Since the adjustment capacitor actually adds capacitance to the LSI (IC chip), it is desirable that the LSI is designed to be slightly smaller than the optimum capacitor capacitance. When adjusting the capacitance, if the capacitance is larger than a predetermined value range while monitoring the capacitance between the antenna coil connection terminals with a measuring instrument such as an impedance analyzer, the connecting portion of the capacitor pattern 151 is disconnected to adjust the capacitance. I do. The combined capacity after cutting and characteristic adjustment is the total capacity (C + Cad) of the fixed C component and Cad remaining after cutting. When the resonance frequency is obtained by adjusting the capacitance of the capacitor, the adjustment resistor is adjusted. The combined resistance after cutting and characteristic adjustment is the combined resistance of the fixed R component and the remaining Rad after cutting, 1 / {(1 / R) + (1 / Rad)}.

(3) <Preparation of Oversheet> On the other hand, the oversheet to be laminated on both sides of the antenna-equipped substrate is prepared by previously printing and decorating a pattern for decorating a card, necessary display, and the like, and an overcoat (protective layer). . When a magnetic stripe is provided, it is transferred to the front side of the oversheet. When other additional functions are provided, they are also provided. These are steps performed in a normal card manufacturing process and are not special. For printing, offset printing or silk screen printing can be adopted. In many cases, a PET base material is used for the oversheet. In this case, the sheets are laminated using the adhesive sheets 124 and 125 or an adhesive.

(4) <Temporary bonding / press lamination> Substrate with antenna 121A after module tuning
And the printed oversheets 122, 123 are laminated via the adhesive sheets 124, 125, etc., and firstly, an appropriate portion is heated and temporarily bonded by an ultrasonic sealer to prevent a gap between the sheets during press lamination. I do. The base material after the temporary attachment is sandwiched between mirror plates, set, introduced into a press machine, and press-laminated. In addition, the resin sheet and the over sheet of the substrate with the antenna are made of vinyl chloride or PET-
In the case of a G sheet, since it is self-fused, no adhesive or adhesive sheet is required for lamination.

After hot pressing, punching is performed into individual card shapes based on the register marks. When additional functions such as face photo printing, sign panel, and hologram foil transfer are provided for the card, the functions are performed after the punching. Thus, the non-contact type IC card of the present invention is completed.

(Examples of Other Materials) (1) <Card substrate> Various substrate sheets other than vinyl chloride resin and PET can be used for the card substrate. For example, PET-G, polypropylene resin , Polycarbonate resin, acrylic resin,
Polystyrene resin, ABS resin, polyamide resin, polyacetal resin and the like can be mentioned. (2) <Laminating adhesive> As the laminating adhesive, a thermoplastic (hot melt) type or a thermosetting / moisture curable adhesive or an adhesive sheet can be used. Further, it may be an adhesive sheet, an adhesive, a cold glue, or the like.

[0030]

FIG. 1 shows an embodiment of the non-contact type IC card of the present invention.
This will be described with reference to FIGS. In addition, the code | symbol in an Example is
These correspond to the reference numerals in the drawings referred to. Example (1) <Formation of Substrate with Antenna> As a substrate sheet for a substrate with an antenna, a substrate in which a 30 μm-thick copper foil was electrodeposited on both sides of a 25 μm-thick polyethylene terephthalate (PET) film was used. As shown in FIG. 1, the antenna coil 1 is arranged on the IC chip mounting surface side of the base sheet so as to have a line width of 2 mm and approximately three turns.
3 and 8 branched equal-area capacitor patterns 15
1, a ladder-shaped adjusting resistor 14 also having eight branches, and an antenna coil connection terminal at a mounting portion of the IC chip were formed by photoetching. On the side opposite to the IC chip mounting surface of the base sheet, similarly, an adjustment capacitor composed of eight capacitor patterns 152 at a position corresponding to the front side, and a back wiring 1 at a portion connecting the through holes 131 and 132.
3B was formed. The thickness of the copper foil after the etching was about 30 μm at any point.

The area of one capacitor pattern was set to 10 mm ² (2.5 mm × 4.0 mm = 10 mm ² ), the unit capacitor capacitance was 5.0 pF, and the total capacitance was 40 pF. On the other hand, each of the ladder-shaped adjusting resistors 14 has a square frame shape with one side of about 4 mm, and eight patterns are formed with a line width of 1 mm. The combined resistance (when the resistance pattern was not cut) between both ends XY (FIG. 2) of this adjustment resistance was 0.03Ω. On the other hand, it was a 0.04Ω when cutting the resistance of cutting edge portions cut line 14C ₁ of FIG. The following table shows the resistance (Ω) between the position where the adjustment resistor is cut and XY.

[Table 1] The combined resistance (Rad) of the adjusting resistor itself is 0.3
Ω, and the resistance value R of the entire antenna coil = 3.50 Ω
(When there is no Rad).

(2) <IC Chip Mounting, Capacitor Capacitance, Resistance Value Adjustment> A non-contact IC card chip (ISO1
443TYPEB: CD chip) was mounted on the antenna coil connection terminal of the antenna-equipped substrate 121A using ACF ("FP20626" manufactured by Sony Chemical Corporation). Temporary ACF conditions were 80 ° C and 10kgf /
cm ² , 1 second, after temporary attachment, 200 ° C, 500gf
The mounting was performed by applying a heat pressure under the conditions of / cm ² and 20 seconds.

The inherent capacitance of this IC chip is 50p
F is the L component (inductance) of the antenna coil
Is 1.36 μH. The C component of the antenna coil is negligible, and the R / W resonance frequency is 14.3.
In order to adjust to 9 MHz, it is necessary from Equation (1) that the combined capacitance of the card is 90 pF. Therefore, the capacitance of the adjusting capacitor is set to 40 pF. That is, in the case of this example, the R / R / R
It was possible to match the resonance frequency of W.

When the resonance frequency f is 14.39 MHz and the resistance value Rad is adjusted, the sharpness (Q) is expressed by the following equation (1).
Is calculated based on the following. Q ₈ = 2.32 × 10 ⁻³ (when there is no Rad, all 8 pieces are cut) Q ₀ = 2.68 × 10 ⁻³ (when all Rads remain) Q ₆ = 2.61 × 10 ^-3 (when six Rads are cut) Q ₇ = 2.55 × 10 ^-3 (when seven Rads are cut) In the case of the present embodiment, to make Q = about 2.55 × 10 ^-3 7 adjustment resistors were cut from the tip.

(3) <Preparation of Oversheet> On the other hand, the oversheet 12 which is the upper and lower surfaces of the IC card
For Nos. 2 and 123, a milky PET base material (“E22” manufactured by Toray Industries, Inc.) having a thickness of 188 μm was used, and on the surface thereof, a pattern formed by offset printing and overcoat layers 122P and 122P were used.
3P was provided. Further, in order to suppress curling of the oversheet, the stretching direction of the oversheet 122 and the oversheet 123 was made orthogonal to each other.

(4) <Temporary Pasting / Press Laminating> The etched substrate 121A and the printed oversheets 122 and 123 are made of a 300 μm-thick polyester adhesive sheet (“Alon Melt” manufactured by Toa Gosei Co., Ltd.) 124. And an adhesive sheet 125 made of the same material and having a thickness of 100 μm, and were temporarily pasted with an ultrasonic sealer. Thereafter, the base material was set between mirror plates and introduced into a press machine at 130 ° C., 10 kgf / cm ² ,
Press lamination was performed under conditions such as 15 minutes.

After hot pressing, the register mark 10 provided in advance
Punching into individual card size based on 1
Processing such as hologram foil and sign panel transfer was performed on the card surface. Thereby, the non-contact I of the card thickness of 800 μm
C card was obtained. The resonance frequency of this non-contact IC card is f = 14.39 MHz, the sharpness, Q = 2.
It was 55 × 10 ^-3 . As a result, a good communication state with the external reader / writer device could be obtained. The communication distance was 5 cm.

[0038]

According to the non-contact type IC card of the present invention, the capacitance and the resistance of the capacitor can be easily adjusted to the optimum values in the manufacturing process. In addition, the antenna characteristics can be adjusted to the optimum resonance frequency and sharpness, and the communication stability can be improved. Therefore, the yield is also improved. Further, the antenna characteristic adjusting method of the present invention can adjust the antenna characteristics of the resonance frequency and the sharpness of the substrate with the antenna by a simple method. In addition, since the capacitance and the resistance of the capacitor are adjusted on the antenna-equipped substrate before the card base is pressed by the hot press, the appearance of the card after press lamination is not impaired.

[Brief description of the drawings]

FIG. 1 is a plan view showing an embodiment of a substrate with an antenna used for a non-contact type IC card of the present invention.

FIG. 2 is a diagram illustrating a method of adjusting an adjustment resistor.

FIG. 3 is a diagram showing an equivalent circuit of a substrate with an antenna.

FIG. 4 is a diagram illustrating a manufacturing process of the non-contact type IC card of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 IC chip 13 Antenna coil 14 Adjustment resistance 15 Adjustment capacitor 101 Registration mark 121A Board with antenna 121 Base sheet 121i Resin base 121c Copper foil 122,123 Oversheet 124,125 Adhesive sheet 131,132 Through hole 141 Resistance Pattern 151, 152 Capacitor pattern

Claims (12)

[Claims] 1. A non-contact type IC card capable of non-contact communication with an external reader / writer, comprising: a resonance circuit including an antenna coil and a planar adjusting resistor in a card base; A non-contact type IC card characterized in that the sharpness (Q) of the resonance circuit can be adjusted by adjusting the resistance value of the middle adjustment resistor to ensure a good communication state. 2. The non-contact type according to claim 1, wherein the adjusting resistor comprises a plurality of circuits branched from the antenna coil, and the resistance value is adjusted by cutting any one of the branched circuits. IC card. 3. The non-contact IC card according to claim 2, wherein the adjusting resistor comprises a plurality of circuits branched in a ladder form from the antenna coil. 4. A non-contact type IC card capable of non-contact communication with an external reader / writer, comprising: a resonance circuit including an antenna coil and a planar adjustment capacitor in a card base; A non-contact type IC card characterized in that it is possible to adjust a resonance frequency (f) of a resonance circuit by adjusting a capacitance of a middle capacitor to secure a good communication state. 5. The non-contact type IC card according to claim 4, wherein the adjusting capacitor comprises a plurality of capacitor patterns having the same unit adjustment amount of capacitance. 6. The non-contact type IC card according to claim 5, wherein the adjustment capacitor comprises a capacitor pattern formed on both sides of the substrate with the substrate sheet of the substrate with the antenna as a dielectric layer. 7. A non-contact type IC card capable of non-contact communication with an external reader / writer, comprising a resonance circuit including an antenna coil, a planar adjusting capacitor and an adjusting resistor in a card base. By adjusting the capacitance and resistance of the capacitor in the resonance circuit, the resonance frequency (f) and the sharpness (Q) of the resonance circuit can be adjusted to ensure a good communication state. Characteristic non-contact type IC card. 8. The non-contact type IC card according to claim 7, wherein the adjusting capacitor comprises a plurality of capacitor patterns having the same unit adjustment amount of capacitance. 9. The non-contact type IC card according to claim 7, wherein the adjusting capacitor comprises a capacitor pattern formed on both sides of the substrate with the substrate sheet of the substrate with the antenna as a dielectric layer. 10. A non-contact type IC card having, in a card base, an antenna coil formed by a photo-etching method, a planar adjusting capacitor, and an adjusting resistor including an adjusting resistor in a card base, the resistance value of the adjusting resistor. A non-contact type IC card characterized in that the sharpness (Q) of the resonance circuit can be adjusted by adjusting the sharpness (Q). 11. A method for adjusting antenna characteristics of a non-contact IC card having a resonance circuit including an antenna coil and a planar adjustment resistor in a card base, comprising: a plurality of antenna coils; An antenna characteristic adjustment method, comprising: adjusting a sharpness (Q) of a resonance circuit by cutting a part of the circuit. 12. A method for adjusting antenna characteristics of a non-contact IC card having a resonance circuit including an antenna coil and a planar adjustment capacitor in a card base, comprising: a plurality of adjustment capacitors provided in the antenna coil. A method of adjusting the resonance frequency (f) of the resonance circuit by cutting a part of the antenna characteristic.