JP2003067688A - Non-contact communication medium and manufacturing method therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a non-contact communication medium for which an antenna coil with high reception ability is easily and stably manufactured at a low cost, and a manufacturing method therefor. SOLUTION: For this non-contact communication medium, an inlet sheet where the antenna coil 2 is formed is arranged on a card base material composed of PET-G and an upper layer substrate and the card base material to be the most surface layer composed of the PET-G are arranged on the inlet sheet further and integrated. When forming the antenna coil 2, a metal wire composed of copper whose cross sectional shape is rectangular is successively formed while being ejected from a nozzle N. It is bent along a winding pin P vertically pressed to a main surface of the inlet sheet from above. At the bent part, it is pressed downwards by a pressing pin A and wound while being shaped to be flat.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a contactless communication medium for reading and writing data in a contactless manner and a method for manufacturing the same, and more specifically, a structure of a transmitting and receiving antenna coil and a method for forming the same. It is about.

[0002]

2. Description of the Related Art In recent years, non-contact type communication media for exchanging signals with external devices using electromagnetic waves have been used in various fields. This non-contact type communication medium basically comprises an IC module (semiconductor integrated circuit) for processing and storing data, and a transmitting / receiving antenna coil for exchanging signals.

Conventionally, the transmitting and receiving antenna coil has a method of directly mechanically winding a conductor wire having a circular cross section, a method of selectively etching a conductor film by a photolithography method, a method of using a printing mask. Etc.

For example, in the method of mechanically winding the antenna coil, the conventional non-contact communication medium is manufactured as follows. First, as shown in FIG. 4A, a conductor wire having a circular cross section is directly mechanically wound around the main surface of the inlet sheet 1 to form the antenna coil 12. Next, as shown in FIG. 4B, the upper substrate 5 is attached to the inlet sheet 1 with an adhesive or the like. Next, as shown in FIG. 4C, an IC having a structure in which an IC chip is mounted on the wiring board 9 and is solidified and integrated with a mold resin 11 such as an epoxy resin.
After applying the conductive adhesive 4 to the area of the connection terminal 12a of the antenna coil, the module 7 is fitted as shown in FIG. 4 (d). Finally, as shown in FIG.
A conventional non-contact communication medium is obtained by sandwiching the card base materials 8 and 13 from above and below as a support.

However, this conventional mechanical winding method is advantageous in terms of production cost, but since the cross-sectional area of the antenna coil is small, the reception area of radio waves is small,
There is a problem that the communication distance between the card and the external device is short due to insufficient reception ability. Further, the etching method has a problem that the receiving area of the antenna coil is wide and the receiving ability is high, but the production cost is high. Furthermore, in the method by printing, although the receiving area of the antenna coil is wide and the receiving ability is high, it is difficult to stably form the printed film, the characteristics are unstable, and the yield is low.
There was a problem that the cost would be high.

[0006]

SUMMARY OF THE INVENTION Therefore, the present invention overcomes the above-mentioned problems of the prior art, and enables a contactless communication medium and an antenna coil having a high receiving ability to be manufactured easily, stably and at low cost. It is to provide the manufacturing method.

[0007]

DISCLOSURE OF THE INVENTION The present invention intends to obtain an objective non-contact communication medium and a method for producing the same by taking the following means. That is, the present invention is a non-contact communication medium comprising a transmitting / receiving antenna coil and an IC module, wherein the antenna coil is made of a rectangular metal wire.

Further, according to the present invention, the surface of the rectangular metal wire opposite to the inlet sheet is formed parallel to the surface of the sheet on which the antenna coil is formed. It is a communication medium.

Further, according to the present invention, the antenna coil may be formed by sequentially winding the rectangular metal wire along a winding pin pressed perpendicularly to a surface of the sheet formed by the antenna coil. It is a method of manufacturing the above-described non-contact communication medium.

Further, according to the present invention, when the flat metal wire is wound around the winding pin, a surface of the flat metal wire opposite to the sheet is pressed to form a bent portion flat. It is a manufacturing method of a non-contact communication medium.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a perspective view showing the outline of the basic configuration of the non-contact communication medium of the present invention. As shown in FIG. 1, the non-contact communication medium of the present invention is a card substrate 8 made of polyethylene terephthalate (hereinafter abbreviated as PET-G).
The inlet sheet 1 on which the antenna coil 2 is formed is disposed on the above, and the upper substrate 5 and the PET-
The card base material 13 which is the outermost surface layer made of G is arranged,
It is integrated.

In the IC module 7, the resin mold 11 is provided in the through hole 3 formed in the inlet sheet 1, and
The wiring board 9 is fitted into the through hole 6 formed in the upper layer board 5.

FIG. 2 is a cross-sectional view for explaining the outline of the manufacturing process of the non-contact communication medium of the present invention of FIG. FIG. 2A shows an antenna coil 2 formed by directly mechanically winding a metal wire having a rectangular cross section on the main surface of the inlet sheet 1 and its connection terminal 2a.

FIG. 2B shows a state in which the upper layer substrate 5 is bonded to the inlet sheet 1 by thermocompression bonding or an adhesive. Since the positions are aligned, the connection terminal 2a of the antenna coil 2 is exposed in the area of the through hole 6.

FIG. 2C shows the conductive adhesive 4 on the area of the connection terminal 2a of the antenna coil exposed in FIG. 2B.
Is applied in a fixed amount by a dispenser, and then the IC module 7 is aligned and opposed.
The IC module 7 has a structure in which an IC chip is mounted on a wiring board 9 made of a urethane material or the like, and is solidified and integrated with a mold resin 11 such as an epoxy resin. 10 is
It is an antenna terminal of an IC module.

FIG. 2D shows the IC in the state of FIG. 2C.
The state where the module 7 is firmly fitted and the connection terminal 2a of the antenna coil and the antenna terminal 10 of the IC module are joined is shown.

FIG. 2 (e) shows a state in which the non-contact communication medium of the present invention is completed by finally sandwiching the card base materials 8 and 13 as a support from above and below.

Next, a method of forming an antenna coil using a rectangular metal wire, which is a feature of the present invention, will be described with reference to FIG. Typical copper with a rectangular cross section,
The antenna coil 2 is sequentially formed while ejecting the metal wire from the nozzle N. When the direction of the metal wire is changed, the winding is performed along the winding pin P which is vertically pressed against the main surface of the inlet sheet from above. I will proceed. It should be noted that the flatter the rectangular shape at the corner portion, the easier it is for the wire to turn up, so push it downward with the push pin A,
Roll while shaping it flat.

By using a flat metal wire whose surface is covered with an insulating film of urethane resin or the like, it is not necessary to take a treatment process for the insulation at the crossing portion of the coil. The gap between the coils can be made small, and it becomes extremely easy to tightly wind.

The antenna coil may be fixed to the inlet sheet by winding the coil with a flat metal wire in order from one end with a thermocompression bonding jig, or after the entire coil pattern is completed, a flat plate-shaped heating treatment is performed. You may go with tools.

[0022]

As described above, according to the present invention described above, as compared with the conventional iter coil having a circular cross section, the cross sectional area can be increased without changing the height of the wire, and the wire coated with insulation is used. Since it is possible to wind with high density,
You can get a large reception area.

Also, in terms of manufacturing cost, since the antenna coil can be directly mechanically formed, it is far more advantageous than other etching methods and printing methods, and the contactless communication is extremely stable in terms of characteristics. It becomes possible to obtain the medium.

INDUSTRIAL APPLICABILITY The present invention is applicable not only to non-contact but also to any medium and device for transmitting / receiving data by an antenna coil such as a communication medium having both functions of non-contact and contact. Of course.

[Brief description of drawings]

FIG. 1 is a perspective view showing an outline of a basic configuration of a non-contact communication medium of the present invention.

FIG. 2 is a sectional view for explaining the outline of the process of the non-contact communication medium of the present invention.

FIG. 3 is a perspective view for explaining an outline of a method for forming an antenna coil according to the present invention.

FIG. 4 is a cross-sectional view for explaining an outline of a process of a conventional non-contact communication medium.

[Explanation of symbols]

1 inlet seat 2,12 antenna coil 2a, 12a Antenna coil connection terminal 3,6 through holes 4 Conductive adhesive 5 Upper substrate 7 IC module 8,13 card base material 9 wiring board 10 IC module antenna terminal 11 Mold resin A push pin N nozzle P winding pin

Claims (4)

[Claims] 1. A non-contact communication medium comprising a transmitting / receiving antenna coil and an IC module, wherein the antenna coil is made of a rectangular metal wire. 2. The non-contact according to claim 1, wherein a surface of the flat metal wire opposite to the inlet sheet is formed parallel to a surface of the sheet on which the antenna coil is formed. Communication medium. 3. The antenna coil is formed by sequentially winding the rectangular metal wire along a winding pin pressed perpendicularly to a surface of the sheet formed by the antenna coil. 1. The method for manufacturing the non-contact communication medium according to 1 or 2. 4. When winding the rectangular metal wire around the winding pin, a surface of the rectangular metal wire opposite to the sheet is pressed to form a bent portion flat. Contactless communication medium manufacturing method.