JPH11204358A - Sheet coil and manufacturing method thereof - Google Patents

Abstract

[PROBLEMS] An inexpensive sheet coil that is suitable for an antenna coil used in an IC card and has excellent handleability and connection workability in an IC card manufacturing process even when an insulated conductor having a small conductor diameter is used. I will provide a. SOLUTION: An insulated wire 10 having a conductor diameter of 0.005 mm to 0.5 mm is wound into a predetermined shape, and its terminal position 4,
4 is fixed to the antenna coil temporary fixing sheet 3 with the coil 2 positioned so as to correspond to the connection target.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an IC chip for storing and processing information (data) inside an electrically insulating plastic case or the like, and for inputting and outputting data to and from an external processing device. The present invention relates to a sheet coil suitable for use in a non-contact type IC card having a built-in data transmission / reception coil (hereinafter, referred to as an antenna coil) for non-contact operation, and a method for manufacturing the same.

[0002]

2. Description of the Related Art In recent years, from the viewpoint of increasing the efficiency of information processing and maintaining confidentiality, IC cards incorporating a storage element such as an IC chip and a control element and having a drastically increased storage capacity have been frequently used. . As such an IC card, for example, a non-contact type in which an antenna coil for transmitting / receiving a radio signal as an input / output signal is built in and configured to read and write data with an external processing device in a non-contact manner IC cards are also being used. In this non-contact type IC card, a built-in antenna coil is configured to receive supply of electric power in the form of magnetic energy from an external processing device, and to transmit and receive input / output signals in a similar manner. Therefore, signals can be transmitted and received without power and without contact.

FIG. 2 shows an example of a non-contact type IC card that has been frequently used. This contactless IC card 8
At least the following parts were provided. A conductor pattern 9 formed by etching with a copper foil on the surface is wound in a ring shape, and has an antenna coil 2 having a coil length necessary for a data transmission / reception function and adhered and fixed on an insulating substrate. An IC chip 5 such as a memory chip mounted thereon for storing information and a microprocessor chip for controlling the same. The antenna coil 2 and the IC chip 5 are connected to the conductor pattern 9 provided on the insulating substrate 7.
Are electrically connected via After the insulating substrate 7 and the IC chip 5 are embedded in a card case made of an ultraviolet curable resin or the like, the front and back surfaces of the substrate 7 sealed with the insulating resin 11, for example, a synthetic resin front surface The IC card 8 is configured by disposing the cover sheet 12A and the back cover sheet 12B, respectively, and fixing them with an adhesive.

[0004]

The antenna coil of a non-contact type IC card usually requires an antenna length for the operating frequency. For example, an IC card having an operating frequency of 13.56 MHz has a length of about 1 m. An antenna coil made of a conductor was required. In most cases, practically used antenna coils were manufactured by etching or printing with excellent productivity.

[0005] However, most of these antenna coils wound and arranged in a ring shape have a total length of about 1 m and 4 to 6 turns. For this reason, an antenna coil manufactured by etching or printing has a lot of wasted parts in a manufacturing process, and the obtained antenna coil has a problem that it is extremely expensive.

Therefore, in order to solve this difficulty, an inexpensive coil manufactured using an insulated conductor having a small conductor diameter has come to be used for an antenna coil. However, an antenna coil made of an insulated conductor having a small conductor diameter is not only difficult to maintain its shape as a coil,
The terminal position of the coil was not fixed. For this reason,
In the IC card manufacturing process, the handling of the antenna coil is very difficult, and the connection work with the IC chip is extremely poor.

An object of the present invention is to provide an inexpensive sheet coil which is suitable for an antenna coil used in an IC card and which is excellent in handleability and connection workability in an IC card manufacturing process even when an insulated conductor having a small conductor diameter is used. Is to provide.

[0008]

According to a first aspect, an insulated conductor having a conductor diameter of 0.005 mm to 0.5 mm is wound into a predetermined shape, and its terminal position is determined so as to correspond to an object to be connected. In the sheet coil fixed to the antenna coil temporary fixing sheet. In the sheet coil having such a configuration, the coil shape is maintained and the coil terminal position is fixed in advance.
It can be used as an inexpensive antenna coil that is excellent in handleability in the IC card manufacturing process and connection workability with the IC chip.

According to the second and third aspects, there is provided a sheet coil using a thermosetting / thermoplastic insulating coated conductor as the insulating coated wire and a nonwoven fabric or an adhesive sheet as the antenna coil temporary fixing sheet. Thereby, the antenna coil and the antenna coil temporary fixing sheet are easily fixed.

[0010] In a fourth aspect, the conductor diameter is 0.005 mm to 0.5 m.
m, and a method for manufacturing a sheet coil, comprising: winding an insulated conductor wire having a predetermined shape in a predetermined shape, and fixing a coil whose terminal position is positioned in accordance with an object to be connected to a sheet for temporarily fixing an antenna coil. I do. This provides a low-cost sheet coil that is suitable for the antenna coil of the IC card, maintains the shape of the coil, improves handling in the manufacturing process, and is excellent in workability with the IC chip.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be specifically described below with reference to the drawings. FIG. 1 is a plan view showing a sheet coil according to the present invention. In the figure, 2 is an antenna coil, 4 is a terminal of the antenna coil 2, and 3 is a nonwoven fabric made of polyester resin or the like.

The antenna coil 2 has a conductor diameter of 0.005 mm to 0.1 mm.
It is composed of a coil formed by winding a 5 mm thermosetting / thermoplastic insulated wire with a winding machine for 4 to 6 turns to form a square shape. The length of the insulated conductor forming the antenna coil 2 is about 1 m.

The antenna coil 2 is provided with a sheet for temporarily fixing the antenna coil in a state where the coil terminal 4 is positioned in advance so as to correspond to a bare chip IC (not shown) of an object electrically connected to the antenna coil 2. It is fixed to a certain nonwoven fabric 3.

[0015] The sheet coil 1 thus configured
Is maintained in the antenna coil temporary fixing sheet 3 in advance so that the coil shape is maintained and the position of the coil terminal 4 corresponds to the connection target. Therefore, the sheet coil 1
By using as an antenna coil, it is possible to greatly improve the handling property in the IC card manufacturing process and the workability of connection with the IC chip. Further, since the antenna coil is formed by winding the insulated conductor, an inexpensive antenna coil can be provided.

A non-contact type IC card using the sheet coil 1 having such a structure as the antenna coil 2 is manufactured as follows. First, coil terminals 4 and 4 are antenna coil 2
Is positioned in advance so as to correspond to a bare chip IC (not shown) which is an object to be connected, and the sheet coil 1 is arranged from above the bare chip IC so that the coil terminals 4, 4 correspond to the bare chip IC, and the antenna Coil 2 and bare chip
The IC is electrically connected by a wedge bonder or the like.

Next, the sheet coil connected to the bare chip IC is fixed on a laminated sheet made of, for example, polyethylene resin, and the bare chip IC and the antenna coil 2 are bonded and fixed on the laminated sheet by performing a laminating process. Then, another laminate sheet is disposed from above the bare chip IC and the antenna coil 2 which are bonded and fixed on the laminate sheet, and the non-contact type IC card is manufactured by laminating.

In the IC card manufactured as described above, since the circuit portion is formed only by the thickness of the bare chip IC and the antenna coil, the thickness of the IC card can be significantly reduced as compared with the conventional product. Will be possible. In addition, the smaller the conductor diameter of the insulated wire, the smaller the thickness of the IC card, and the less the number of components constituting the IC card, so that an inexpensive IC card with greatly improved productivity can be obtained.

It goes without saying that the nonwoven fabric for fixing the antenna coil may be an adhesive sheet.

[0020]

The sheet coil obtained by the present invention is
Since the coil with a small conductor diameter and a small number of windings of the insulated wire is fixed to the antenna coil temporary fixing sheet in advance so that the coil end position corresponds to the connection target,
An antenna coil suitable for an IC card in which the shape as a coil is maintained can be obtained. As a result, handleability in the IC card manufacturing process and workability for connection with the bare chip IC are greatly improved. Further, since the number of parts is small, the IC card can be manufactured with high work efficiency, and an inexpensive IC card can be obtained. In addition, the thickness has been greatly reduced compared to conventional products
IC card can be provided. The practical effect is large.

[Brief description of the drawings]

FIG. 1 is a plan view showing a configuration of a sheet coil according to the present invention.

FIG. 2 is a cross-sectional view illustrating a configuration of a conventional IC card.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Sheet coil 2 Antenna coil 3 Antenna coil temporary fixing sheet 4,4 Coil terminal 5 Bare chip IC 7 Insulating board 8 IC card 9 Conductive pattern 10 Insulated wire 11 Insulating resin 12A, 12B Cover sheet

Claims (4)

[Claims] A coil formed by winding an insulated conductor wire is a sheet coil fixed to an antenna coil temporary fixing sheet, and the antenna coil temporary fixing sheet has a conductor diameter of 0.
A sheet wherein an insulated conductor of 005 mm to 0.5 mm is wound in a predetermined shape, and an antenna coil 2 having terminal positions 4, 4 positioned so as to correspond to an object to be connected is fixed. coil. 2. The sheet coil according to claim 1, wherein the insulating-coated conductor is a thermosetting / thermoplastic insulating-coated conductor. 3. The sheet coil according to claim 1, wherein the antenna coil temporary fixing sheet is a nonwoven fabric or an adhesive sheet. 4. An antenna coil 2 in which an insulated wire having a conductor diameter of 0.005 mm to 0.5 mm is wound into a predetermined shape and its terminal position 4 is positioned so as to correspond to an object to be connected.
4. The method according to claim 1, wherein the sheet is fixed to the antenna coil temporary fixing sheet.