JP2004171087A - Ic card - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an IC card for preventing disconnection of an antenna coil caused by both a manufacturing process and handling in use in the IC card used in common for contact and noncontact. <P>SOLUTION: This IC card 1 has a connecting terminal assembly, and is constituted so that an IC module 10 having both functions of contact/noncontact is installed in an embedded recessed part, and a noncontact communication function part of the IC module is connected to the antenna coil in a card base body. This IC card forms connecting end parts 241 and 242 by folding up the antenna coil in a zigzag shape when the antenna coil 24 is a coil, and a part of extending the antenna coil connecting end part tail end side is connected to the antenna coil connecting end part starting end side while forming annular circuits 243 and 244 for avoiding a cutting position of the embedded recessed part. This IC card 1 can be applied even when the antenna coil is formed by etching or printed wiring. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a non-contact IC card, and more particularly to an invention for improving the reliability of connection between an IC module and an antenna coil in a card base in an IC card for both contact and non-contact.
Therefore, the field of use of the present invention relates to the field of manufacture and use of non-contact IC cards.
[0002]
[Prior art]
A non-contact IC card includes an antenna sheet having a coil formed inside the card in order to obtain power and signals from the outside in a non-contact manner based on the principle of electromagnetic induction.
An IC chip that processes and stores signals to be received and transmitted is connected to a coil antenna and used as an integrated antenna sheet, or as an IC module with a substrate, mounted on the card surface, and mounted on the card surface. It may be connected to an antenna sheet.
In the case of a contact / non-contact type IC card, the contact terminal plate must be on the card surface, so that the latter is inevitable.
[0003]
4 is a plan view showing an example of a contact / non-contact type IC card, FIG. 5 is a view showing an IC module embedding recess, FIG. 6 is an enlarged sectional view of the IC module part of FIG. 4, and FIG. FIG. 8 is a diagram showing a back surface of the non-contact IC module, and FIG. 8 is a diagram showing an example of disconnection occurring in a conventional antenna pattern.
In this specification, the vertical scale of each cross-sectional view is shown larger than the horizontal scale for easy understanding.
[0004]
As shown in FIG. 4, the contact / non-contact IC card 1 has a contact / non-contact IC module 10 mounted on an IC card base 21.
The card surface side of the IC module 10 is a contact terminal plate, and has a terminal plate arrangement specified by ISO.
On the lower surface of the IC module 10, a structure in which the winding of the antenna coil 24 provided in the IC card base 21 is folded in a zigzag shape is formed, and serves as a connection end of the antenna coil. The folding structure is used to increase the bonding area with the conductive paste as described later.
The present invention is not limited to the case where the antenna coil is a winding. However, in the case of the winding, it is considered that the number of disconnections is increased. Therefore, in each of the drawings (except for FIG. 2), the antenna coil 24 is provided by the winding. Shows the case. In the case of a winding, a relatively thick wire having a diameter of about 0.1 mm is used to facilitate excavation for exposing the connection portion.
[0005]
FIG. 5 is a view showing the recessed portion where the IC module is embedded. In FIG. 4, it can be considered that the IC module 10 has been peeled off.
The IC module embedding recess is a first embedding recess 221 having a size and depth capable of fitting the terminal board of the IC module 10, and a second embedding recess having a central portion and a depth capable of fitting the mold portion of the IC module 10. 222. The antenna coil connection ends 241 and 242 are located on the lower surface of the first embedded recess 221 and on the left and right portions of the second embedded recess 222.
The antenna coil connection ends 241 and 242 have a structure in which the wire, which is a winding, is folded in a zigzag shape as described above.
[0006]
When connecting the antenna coil connection ends 241 and 242 to the antenna connection terminals of the IC module 10, semi-elliptical or semi-circular holes 151 and 152 are further excavated from the cut surface of the first buried concave portion, and winding is performed. So that the metal surface is exposed.
The portions indicated by solid lines in the openings 151 and 152 indicate portions where the metal of the antenna coil 24 is exposed, and the broken lines indicate that the windings are inside the card base. The ends 241e and 242e of the winding are slightly elongated, but are not connected to anything.
After the winding is exposed by the excavation, the openings 151 and 152 are filled with a thermosetting conductive paste, and the IC module 10 is put thereon and fixed.
[0007]
As shown in the cross-sectional view of FIG. 6, the IC card base 21 has a configuration in which, for example, a milky white core sheet 211, a milky white core sheet 212, a back side transparent oversheet 213, and a front side transparent oversheet 214 are stacked. ing.
The antenna coil 24 is formed on the surface of the milky white core sheet 211 by winding the winding several times in a plane, or by etching a metal foil laminated on the core sheet, or by printed wiring, The antenna coil connection ends 241 and 242 at both ends thereof are arranged to face under the first embedded recess 221 of the IC module mounting portion.
The fact that the antenna coil connection ends 241 and 242 have three elliptical shapes means that the leading end of the winding is folded in a zigzag shape three or four times into a plate shape.
[0008]
When mounting the IC module 10 in the embedded recess 22, a hot-melt adhesive sheet is attached to a portion of the IC module suspended in the first embedded recess, and the thermosetting conductive adhesive is applied to the openings 151 and 152. After filling (paste), the IC module 10 is placed on the buried recess 22 and lightly heat-pressed.
As a result, the IC module 10 is fixed to the buried recess 22, and conduction between the non-contact interface portion of the IC module and the antenna coil 24 is secured by the conductive adhesive.
[0009]
As shown in the rear view of the contact / non-contact IC module of FIG. 7, the antenna connection terminals 12 connected to the IC chip 2 from the mold portion 11 in which the contact / non-contact IC chip 2 is sealed with resin. A pattern 13 is formed, and the antenna connection terminals 12 and 13 are brought into contact with the conductive adhesive filled in the openings 151 and 152 so as to be electrically connected to the antenna connection terminals in the card base as described above. You.
[0010]
Although the contact / non-contact type IC card manufactured as described above is used, disconnection occurs during the manufacturing process of the IC card, particularly during excavation of the openings 151 and 152.
Even though the wire is relatively thick, it is only 0.1 mm in diameter, so it is quite difficult to dig until the antenna coil is reliably exposed while maintaining production efficiency. Therefore, the antenna coil is often disconnected by the end mill.
For example, in FIG. 8, if the “x” portion of the antenna coil connection end 241 or 242 is disconnected, the non-contact communication will not function.
The disconnection that occurs after hot pressing of the card base is fatal and cannot be repaired, causing the card to be remade, resulting in a large loss with a decrease in yield.
[0011]
Further, in the conventional contact / non-contact IC card, since stress such as bending is repeatedly applied to the IC card base, a connection failure between the IC module and the antenna coil may occur.
In particular, an IC module generally has an IC chip mounted on a printed circuit board made of a base material such as glass epoxy or BT resin (bismaleimide / triazine resin), and further secures physical strength and prevents corrosion. The IC chip is hardened with a strong encapsulating resin in order to fit. On the other hand, the card base is made of plastic such as vinyl chloride or PET-G, and is a flexible material as compared with the IC module. When it is bent from, stress tends to concentrate on the portion.
For this reason, when a stress is repeatedly applied, a crack is easily formed from the boundary portion, and when an antenna line is present in the crack portion, a disconnection occurs and non-contact communication becomes impossible.
[0012]
Conventionally, various proposals have been made to prevent disconnection of an antenna coil in an IC module and a card base and increase connection reliability.
For example, Patent Literature 1 describes that an IC module is mounted such that a resin layer of a sheet constituting a card base is interposed between an antenna connection terminal and the IC module. Patent Literature 2 describes that a stress absorbing hole is provided around a counterbore.
[0013]
[Patent Document 1] JP-A-11-353439 [Patent Document 2] JP-A-2000-207518
[Problems to be solved by the invention]
Although a certain degree of reinforcing effect can be obtained by the techniques of the above-mentioned patent documents, it cannot be said that the handling of the IC card in the field where the card is used necessarily has a sufficient strength.
Moreover, none of the prior arts proposes a method for effectively preventing disconnection of an antenna coil in a manufacturing process of a contact / non-contact type IC card.
In view of this, the present inventor has studied to effectively prevent disconnection of the antenna coil in the manufacturing process of the contact / non-contact type IC card and to achieve a card having high durability even when the IC card is used. The present invention has been completed.
[0015]
[Means for Solving the Problems]
A first aspect of the present invention to solve the above problems is that an IC module having a contact terminal plate and having both contact and non-contact functions is mounted in a buried recess, and a non-contact communication function section of the IC module is mounted on a card base. In an IC card connected to an antenna coil in a body, an antenna coil formed of a winding is folded in a zigzag shape to form an antenna coil connection end, and a portion extending from the antenna coil connection end end side is a cutting position of a buried recess. An IC card is connected to the antenna coil connection end start end side while forming an annular circuit that avoids the above.
[0016]
A second aspect of the present invention to solve the above-mentioned problem is that an IC module having a contact terminal plate and having both contact and non-contact functions is mounted in an embedded recess, and a non-contact communication function section of the IC module is mounted on a card base. In the IC card connected to the antenna coil in the body, it is required that the extended portion of the terminal end side of the antenna coil connection end is connected to the start end side of the antenna coil connection end while forming an annular circuit avoiding the cutting position of the buried concave portion. IC card.
[0017]
BEST MODE FOR CARRYING OUT THE INVENTION
The IC card of the present invention differs between the case where the antenna coil is formed by winding and the case where it is formed by etching or printed wiring, so that the case will be described below with reference to the drawings. .
FIG. 1 shows a first embodiment of the IC card of the present invention, in which the antenna coil is a winding, and FIG. 2 shows the second embodiment, in which the antenna coil is an etched or printed wiring. . FIG. 3 shows the relationship between the layer configuration of the IC card and the embedded recess.
[0018]
FIG. 1 shows a case where the antenna coil is a winding. FIG. 1 (A) is a plan view showing an example of a contact / non-contact IC card of the present invention, and FIG. 1 (B) is FIG. 3 shows an IC module embedding recess of the IC card of FIG.
As shown in FIG. 1A, in the contact / non-contact IC card of the present invention, unlike the conventional example of FIG. 4, the cutting edge of the terminal side of the antenna coil connection ends 241 and 242 is the cutting position of the buried recess. Is characterized in that it has annular circuits 243 and 244 that bypass the.
The annular circuits 243 and 244 are formed so as to be connected to the antenna coil 24 at a portion outside the buried recess and not affected by cutting.
[0019]
As shown in FIG. 1B, the annular circuits 243 and 244 detouring around the openings 151 and 152 and the first buried recess 221 which are the cutting positions are points P and Q on the starting end side of the coil connection end. Connected to the antenna coil 24.
The connection in the case of a winding is performed by melting the winding metal by applying a high temperature, polishing and peeling off the coating of the winding to conduct, or wiring by using a winding without the coating, and conversely, FIG. A method of, for example, placing an insulator at the intersection A of A) can be adopted.
[0020]
With such a circuit configuration, even if the antenna coil connection end 241 formed by folding is broken at the end of the arrow indicated by R in the drawing during manufacture, the antenna of the IC module can be seen from the annular circuit 243 side. The function is not lost because it is connected to the connection terminal. The same applies to the case where the connection end 242 is broken at the tip of the arrow indicated by S in the figure. Since the connection is made to the IC module from the ring circuit 244 side, the function is not lost.
[0021]
FIG. 2 shows a second embodiment in which the antenna coil is an etched or printed wiring. FIG. 2A is a plan view showing an example of a contact / non-contact IC card of the present invention, and FIG. 2B shows an IC module embedded recess of FIG. 2A.
As shown in FIG. 2A, in the contact / non-contact IC card of the present invention, the antenna coil connection ends 245 and 246 are formed in a flat plate shape. This is because there is no need to dare to form a folded wire instead of a wound wire.
Also in this case, there is a feature that the foremost end portion provided at the end side provided to extend from the antenna coil connection end portions 245 and 246 has annular circuits 247 and 248 which bypass the cutting position of the buried concave portion.
[0022]
As shown in FIG. 2B, the annular circuits 247 and 248 that bypass the openings 151 and 152 and the first buried recess 221 that are the cutting positions are connected to the antenna coil 24 at points P and Q on the starting end side of the coil. are doing.
In the case of etching or printed wiring, connection at points P and Q is easy, but at point A in FIG. 2 (A), it is necessary to interpose an insulating layer so as not to short-circuit. .
[0023]
With such a circuit configuration, even if the portion connected to the antenna coil connection end 245 is broken at the end of the arrow indicated by R in the drawing during manufacture, the ring circuit 247 side connects to the antenna connection terminal of the IC module. No loss of functionality due to connection. The same applies to the case where the portion connected to the connection end 246 is disconnected at the tip of the arrow indicated by S in the figure, and the function is not lost because the connection is made to the IC module from the ring circuit 248 side.
[0024]
These effects are remarkable not only in the case of the IC card manufacturing process but also in the handling of the IC card in the field where the IC card is used.
For example, in the IC card shown in FIG. 1B, even if a break occurs at the X point or the Y point during use, the connection is established at the M point or the N point, so that the connection with the IC module 10 is secured. However, the contactless communication function is not lost.
The same applies to the case of FIG. 2B, and it can be easily analogized that the same applies to the case where the wire is disconnected at the point M or the point N.
[0025]
In the above and following embodiments, conduction between the antenna coil connection terminals 241 and 242 and the antenna connection terminals 12 and 13 of the IC module is performed by filling the semi-elliptical or circular openings 151 and 152 with conductive paste. However, there are various conduction methods during this period, and the conduction method is not limited to this example.
In particular, in the case of a flat antenna coil connection terminal as shown in FIG. 2, it is not necessary to provide a large opening, and a small hole is often excavated to achieve conduction.
[0026]
【Example】
(Example 1)
First Embodiment A first embodiment will be described with reference to FIGS.
<Preparation of antenna sheet>
The antenna sheet was formed on the surface of a milky white vinyl chloride core sheet 211 having a thickness of 360 μm, and an enamel-coated copper wire having a wire diameter of about 100 μm was wound around the card base several times. The copper wire was fixed to the core sheet by a method in which the enamel coating of the wire was melted and fixed to the core sheet.
The connection end portions 241 and 242 of the antenna were formed by bending the copper wire material three times in a zigzag shape and solidifying the copper wire material so as to have a plane of about 2 mm square. The extended ends of the connection ends 241 and 242 of the antenna are formed as annular circuits 243 and 244 that bypass the cutting position of the buried recess as shown in FIG. The antenna coil 24 was connected at points Q and Q. The connection was instantaneously heated to the copper wire and melted.
[0027]
<Preparation of card base>
As shown in FIG. 3, the card base 21 ties together the 360 μm thick milky white vinyl chloride core sheet 211 and the 360 μm thick milky white vinyl chloride core sheet 212 on which the antenna 24 is formed. A 50 μm-thick transparent vinyl chloride oversheet 213 is combined on the back side with a 50 μm-thick transparent vinyl chloride oversheet 214 on the front side.
The stack of card base materials was introduced into a press machine, hot-pressed (conditions: 1.5 × 10 ⁶ Pa, 150 ° C., time 5 minutes), cooled, integrated, and then taken out. Cut to card size.
[0028]
<Installation of IC module>
Thereafter, a buried recess 22 for mounting an IC module was excavated with a counterbore. The depth D1 of the first embedded recess 221 was 190 μm, and the size was 11.9 × 13.1 mm. The depth D2 of the second embedded recess 222 was set to 600 μm from the card surface, and the size was set to a size (8.0 × 8.0 mm) in which the mold part of the IC module could be fitted.
Next, semi-elliptical holes 151 and 152 for antenna connection were excavated from the surface of the first buried recess using an end mill. By setting the depth D3 of the openings 151 and 152 to 360 μm from the card surface, the depth D3 reaches a depth substantially reaching the center of the winding of the antenna coil connection ends 241 and 242.
[0029]
The contact / non-contact type IC module 10 having a contact terminal plate size of 11.8 × 13.0 mm and a thickness of 180 μm was used. A hot-melt adhesive sheet having a thickness of 50 μm is adhered to the back surface of the IC module, and the openings 151 and 152 are filled with a conductive paste. Then, the IC module 10 is fitted into the embedded recess 22. The mounting of the IC module was completed by applying a slight heat pressure from above the IC module.
[0030]
(Example 2)
Second Embodiment A second embodiment will be described with reference to FIGS.
<Preparation of antenna sheet>
As the antenna sheet, a material obtained by laminating a 35 μm thick copper foil on a 360 μm thick milky white vinyl chloride core sheet 211 was used. The copper foil surface was etched by a photoetching method to form the antenna coil 24 and the antenna coil connection ends 245 and 246.
The antenna coil 24 was formed so as to go around the card base several times, and the connection end of the antenna was formed to be a 2 mm square flat plate. The antenna coil connection ends 245 and 246 are provided with extending ends, and the ends are formed as annular circuits 247 and 248 which bypass the cutting position of the buried recess as shown in FIG. A pattern was formed so as to be connected to the antenna coil 24 at points P and Q on the part start end side.
[0031]
The subsequent preparation of the card base and mounting of the IC module were performed in the same manner as in Example 1, and the digging depth D3 of the openings 151 and 152 was also set to be 360 μm from the card surface.
[0032]
In the manufacturing methods of the IC cards of Example 1 and Example 2, disconnection of the antenna coil did not occur in the manufacturing process, and the effect of improving the yield was remarkably recognized.
In addition, any completed IC card is less likely to be disconnected in handling during use, and the non-contact communication function is not significantly disabled.
[0033]
【The invention's effect】
As described above, in the IC card of the present invention, since the annular circuit that avoids the cutting position of the buried recess is formed at the connection end of the antenna coil, it is unlikely that the coil is disconnected in the manufacturing process, resulting in a defective product. .
Further, since there are a plurality of paths of the antenna coil connected to the IC module, the number of accidents in which non-contact communication becomes impossible due to disconnection in the use process of the IC card is reduced.
[Brief description of the drawings]
FIG. 1 is a diagram illustrating a first embodiment of an IC card according to the present invention, in which an antenna coil is a winding.
FIG. 2 is a view showing a second embodiment of the IC card of the present invention, in which an antenna coil is an etched or printed wiring.
FIG. 3 is a diagram showing a relationship between a layer configuration of an IC card and a buried recess.
FIG. 4 is a plan view showing an example of a contact / non-contact IC card.
FIG. 5 is a view showing an IC module embedded recess of the IC card of FIG. 4;
FIG. 6 is an enlarged sectional view of the IC module part of FIG.
FIG. 7 is a diagram showing a back surface of a contact / non-contact IC module;
FIG. 8 is a diagram illustrating an example of occurrence of disconnection in a conventional antenna pattern.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Contact / non-contact IC card 2 Contact / non-contact IC chip 10 Contact / non-contact IC module 11 Mold part 12, 13 Antenna connection terminal 21 IC card base 22 Embedded recess 24 Antenna coil 151, 152 Opening 211, 212 Core sheet 213, 214 Oversheet 221 First buried recess 222 Second buried recess 241, 242, 245, 246 Antenna coil connection ends 243, 244, 247, 248 Ring circuit

Claims (4)

An IC card having a contact terminal plate and having both contact and non-contact functions is mounted in an embedded recess, and a non-contact communication function part of the IC module is connected to an antenna coil in a card base. The antenna coil is folded in a zigzag shape to form the antenna coil connection end, and the portion extending from the antenna coil connection end end side forms an annular circuit that avoids the cutting position of the buried concave portion while forming the antenna coil connection end start end. An IC card connected to the IC card. In an IC card in which an IC module having a contact terminal plate and having both functions of contact and non-contact is mounted in an embedded recess, and a non-contact communication function part of the IC module is connected to an antenna coil in a card base, An IC card characterized in that a portion extending from an end end side is connected to an antenna coil connection end start end side while forming an annular circuit that avoids a cutting position of a buried recess. 3. The IC card according to claim 2, wherein the antenna coil and the antenna coil connection end are formed by etching a metal foil. 3. The IC card according to claim 2, wherein the antenna coil and the antenna coil connection end are formed by printed wiring.

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