JP2000090225A - Antenna coil for non-contact ic card - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the warp or deformation of a coil, which is constituted by winding an enamel wire in extremely fine size plural times, by improving rigidity and to enable improvement in dimension accuracy and shape accuracy by rolling the coil. SOLUTION: A self-fusing enamel wire 2 in extremely fine size is used and wound into rectangular roll for five turns, for example, and the coil is heated by blowing hot air so that wires are fused. The main body part of coil, with which the wires are fused like this, is rolled by a presser or roller except a non-rolling part 3 across a winding start terminal part 31 and winding end terminal part 32 of the self-fusing enamel wire 2 so as not to reduce the inter- wire electric insulation of self-fusing enamel wire 2 at the crossing part because of rolling. In such a case, the self-fusing enamel wire 2 is rolled so that the ratio of thickness and width after rolling can be less than '4' in order to prevent the reduction of electric insulation. The non-rolling part 3 crossing the terminal parts 31 and 32 is not rolled or just rolled less than the half of the main body part.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an antenna coil for a non-contact type IC card. More specifically, the present invention is for a non-contact type IC card having a function of obtaining driving power of an IC card by non-contact electrical coupling or a function of performing communication between the IC card and the outside. It relates to an antenna coil.

[0002]

2. Description of the Related Art In recent years, IC cards have been used as cash cards,
It is being used in various fields such as toll tickets, hospital charts, and membership cards.

A conventional IC card is a contact type IC card, and supply of driving power to the contact type IC card and communication with the outside are performed through contacts provided on the surface of the contact type IC card. Has become. That is, the contact type IC
The supply of the driving power to the card and the communication with the outside are performed by bringing the contact type IC card into contact with the contact pins of the read drive device when the card is passed through the read drive device. For this reason, there is a concern that the contact surface of the contact type IC card will be worn away.

On the other hand, in the non-contact type IC card, the supply of the driving power and the communication with the outside are performed by electromagnetic induction. For this reason, the demand for non-contact type IC cards tends to increase rapidly.

This non-contact type IC card requires an antenna coil for a non-contact type IC card for supplying drive power and communicating with the outside. This antenna coil for a non-contact type IC card has a coil of several turns formed on a card by means such as winding of an insulated wire, etching and printing.

Here, as an insulated wire used for manufacturing an antenna coil for a non-contact type IC card by a winding method, an ultrafine enamel wire having a diameter φ of several tens μm is used.

[0007]

The diameter φ is several tens.
The micron fine enameled wire has very low rigidity. Therefore, when the coil is wound around a coil using an ultrafine enamel wire and then the coil is taken out from the coil, there is a problem that the coil is likely to be warped due to residual stress at the time of winding.

Further, when the coil thus taken out is laminated with a film or the like together with an IC card or an IC chip as an intermediate product thereof, the sheet is often subjected to various external forces when it is formed into a sheet. As a result, there was a problem that the shape of the coil was deformed by those external forces.

The present invention has been made in view of such a point, and an object of the present invention is to solve the above-mentioned disadvantages of the prior art, to have high rigidity, thereby making the warpage and deformation of the coil extremely small. Another object of the present invention is to provide a non-contact type IC card antenna coil having high dimensional accuracy and high shape accuracy.

[0010]

SUMMARY OF THE INVENTION The gist of the present invention is to have a function of obtaining driving power of an IC card by non-contact electrical coupling and a function of communicating with the outside. In the antenna coil for a non-contact type IC card, the antenna coil for the non-contact type IC card is obtained by rolling a coil formed by winding an enamel wire of a very fine size a plurality of times. It is in the antenna coil for IC card.

In the present invention, it is preferable that an adhesive is dropped, impregnated, and cured between the wires of the coil.

In the present invention, it is preferable that the ultrafine enameled wire is formed of a self-fusing enameled wire, and that a wire formed by winding the self-fusing enameled wire is fused.

In the present invention, the rolled portion is formed such that both the winding start terminal portion and the winding end terminal portion of the enamel wire are drawn out to the same side either inside or outside of the coil, and the winding start terminal portion or the winding end terminal is formed. It is preferable that any of the portions is a portion excluding an intersection portion that intersects with the enamel wire of the coil body.

[0014]

Next, an embodiment of the antenna coil for a non-contact type IC card according to the present invention will be described with reference to FIGS.

FIG. 1 is a perspective view showing an embodiment of the antenna coil for a non-contact type IC card of the present invention.

FIG. 2 is an enlarged sectional view of a self-fusing enameled wire used for manufacturing the antenna coil for the non-contact type IC card shown in FIG.

FIG. 3 is an enlarged sectional view of a non-rolled portion of the antenna coil for a non-contact type IC card of FIG. FIG.
FIG. 2 is an enlarged sectional view of a rolled portion of the antenna coil for a non-contact type IC card of FIG. 1.

1 to 4, reference numeral 1 denotes an antenna coil for a non-contact type IC card, 2 denotes a self-fusing enameled wire, 3 denotes a non-rolled portion of the coil 1, and 4 denotes a flat-rolled self-fusing portion of a rolled portion of the coil 1. Adhesive enameled wire, 21 is a conductor, 22 is a polyurethane enamel insulating layer, 23 is a polyamide self-fusion layer, 31
Is a winding start terminal portion, and 32 is a winding end terminal portion.

That is, the antenna coil for a non-contact type IC card according to one embodiment of the present invention is firstly wound into a square winding (not shown) by using an ultrafine self-fusing enameled wire as shown in FIG. Wind turns.

Next, the coil was fused by heating the coil with hot air. In this case, the line-to-line fusion can also be performed by current-flow heating fusion or alcohol immersion fusion instead of hot air blowing and heat fusion.

Next, the coil body having been fused between the wires as described above is connected to the terminal portion 31 at which the self-fusing enameled wire 2 starts to be wound.
Rolling was performed by a pressing device or a rolling roll except for the non-rolled portion 3 intersecting with the winding end terminal portion 32. Here, in the rolling of the self-fusing enameled wire 2, the thickness-width ratio (width / thickness) after rolling is set to 4 or less in order to prevent a decrease in electrical insulation. Here, the reason why the non-rolled portion 3 that intersects the winding start terminal portion 31 and the winding end terminal portion 32 of the self-fusing enamel wire 2 is not rolled under the same conditions as the coil body portion is that the self-fusing enameled wire 2 has a self-fusing This is because the interline electrical insulation of the adhesive enamel wire 2 is reduced. Therefore, the non-rolled portion 3 that intersects the winding start terminal portion 31 and the winding end terminal portion 32 of the self-fusing enamel wire 2
Is not rolled, or even if it is rolled, rolling is limited to half or less of the coil body.

The thus obtained antenna coil for a non-contact type IC card has increased rigidity due to rolling and hardening, so that the coil does not warp or deform even when subjected to residual stress or external force during winding. As a result, a highly reliable coil having a design size and a design shape could be obtained. The highly reliable coil non-contact type IC coil antenna coil obtained in this manner has a deformation defect even in the work of being formed into a sheet by lamination with an IC card or an intermediate product such as an IC chip. As a result, the productivity and quality of the non-contact type IC card were significantly improved.

The present invention is not limited to the above-described embodiment, but has substantially the same configuration as the technical idea described in the claims of the present invention, and achieves the same operation and effect. Anything is included in the technical scope of the present invention.

For example, in the above-described embodiment of the present invention, the self-fusing enameled wire 2 is used as the ultrafine enameled wire, but the same effect can be exerted by a general type of ultrafine enameled wire. .

When a general type of ultrafine enameled wire is used, after winding the coil,
It is desirable that a liquid adhesive, for example, an unsaturated polyester varnish, an epoxy varnish, or the like be dropped, impregnated, and cured from above the coil so as to adhere the wire between the coils.

In the above-described embodiment of the present invention, the winding start terminal portion 31 and the winding end terminal portion 32 of the self-fusing enameled wire 2 were not rolled because both of them came out of the coil. .

On the other hand, in the present invention, the winding start terminal portion 31 can be extended inside the coil, and the winding end terminal portion 32 can be extended outside. In this case, the winding start of the self-fusing enamel wire 2 can be performed. The terminal portion 31 and the end-of-winding terminal portion 32 do not intersect with the coil body portion, so that the entire coil can be rolled collectively under the same conditions.

In the above-described embodiment of the present invention, the rolling operation is performed after the fusion work between the coils is performed. On the contrary, the coil is wound into a square winding form, and then the rolling operation is performed. It is also possible to perform a rolling operation in a state of being kept in a square winding form, and finally perform a line fusion operation.

[0029]

The antenna coil for a coil non-contact type IC card of the present invention does not warp or deform the coil even if it receives a residual stress at the time of winding or an external force at the time of assembling the IC card. The productivity and quality of the contact type IC card can be remarkably improved, and it is industrially useful.

[Brief description of the drawings]

FIG. 1 is a perspective view showing one embodiment of an antenna coil for a non-contact type IC card of the present invention.

FIG. 2 is an enlarged sectional view of a self-fusing enameled wire used for manufacturing the antenna coil for a non-contact type IC card shown in FIG.

FIG. 3 is an enlarged sectional view of a non-rolled portion of the antenna coil for a non-contact type IC card of FIG. 1;

FIG. 4 is an enlarged sectional view of a rolled portion of the antenna coil for a non-contact type IC card of FIG. 1;

[Explanation of symbols]

 Reference Signs List 1 antenna coil for non-contact type IC card 2 self-fusing enameled wire 21 conductor 22 polyurethane enamel insulating layer 23 polyamide self-fusing layer 3 non-rolled part 31 winding start terminal part 32 winding end terminal part 4 rectangular rolled self-fusion Enamel wire

Claims (4)

[Claims] An antenna coil for a non-contact type IC card having a function of obtaining a driving power of an IC card and a function of performing communication with the outside by a non-contact electric coupling. An antenna coil for a non-contact type IC card, wherein the antenna coil for a type IC card is obtained by rolling a coil formed by winding an ultra-fine enamel wire a plurality of times. 2. The non-contact type IC according to claim 1, wherein an adhesive is dropped and impregnated between the wires of the coil.
Card antenna coil. 3. An ultrafine enameled wire is made of a self-fusing enameled wire, and the wire between the coils formed by winding the self-fusing enameled wire is fused. Item 2. An antenna coil for a non-contact type IC card according to item 1. 4. The rolled portion is such that both the winding start terminal and the winding end terminal of the enameled wire are drawn out to the same side, either inside or outside the coil, and the winding start terminal or the winding end terminal 2. The antenna coil for a non-contact type IC card according to claim 1, wherein any one of the portions is a portion excluding an intersection portion that intersects with the enamel wire of the coil body.