JPH04292998A - Ic card - Google Patents

Abstract

PURPOSE:To extend a transmittable and receivable distance by widening the aperture area of a data transmitting-receiving coil-shaped antenna and to enhance function in a non-contact input/output type IC card performing the data reading and writing with an external processor according to a radio system. CONSTITUTION:In the IC card hating at least an IC chip and a data transmitting-receiving coil-shaped antenna built therein and having an insulating outer layer applied to the main surface thereon, the data transmitting-receiving coil-shaped antenna is integrally arranged to the inner surface of the insulating outer layer applied to the main surface of the card. Since the data transmitting- receiving coil-shaped antenna is integrally arranged to the rear (inside) of the insulating outer layer, the aperture area of a coil can be sufficiently widened and a transmittable and receivable distance by radio can be extended. Since the part mounting area on a printed circuit board is increased as a result, more elements or parts can be mounted and the enhancement of function can be realized.

Description

[Detailed description of the invention]

[Object of the invention]

0002

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an IC card that allows data to be read and written without contact.

0003

[Background Art] In recent years, in order to improve the efficiency of information processing and maintain confidentiality, semiconductor devices such as IC chips that store and process information (data) have been mounted, dramatically increasing storage capacity. A data card called an IC card is used.

[0004] Recently, antenna circuits (coils) for transmitting and receiving data have been incorporated to transmit and receive input and output radio wave signals.
Read and write data to and from external processing devices,
An IC card configured to perform contactless communication using a so-called wireless method has also been developed. That is, IC cards are being put into practical use in which a spiral conductive pattern is formed on the periphery of a circuit board surface on which an IC chip or the like is mounted and is used as a transmitting and receiving antenna.

The transmission and reception sensitivity of the wireless IC card having the above configuration is determined by the impedance and aperture area of the coil functioning as an antenna, and the lower the impedance and the larger the aperture area, the better the transmission and reception sensitivity. Therefore, in conventional IC cards, the transmitting/receiving coil antenna is formed with a conductive pattern as thick as possible to lower the impedance, and this conductive pattern is formed in a spiral shape along the outer periphery of the circuit board. We are trying to increase the area.

[0006]

[Problem to be Solved by the Invention] However, since the external dimensions of the IC card with the above structure are specified, it is necessary to mount circuit components such as IC chips from the outer periphery of the circuit board in order to obtain the necessary coil length.・The coil pattern must be formed toward the central area to be mounted,
Therefore, the opening area cannot be expanded sufficiently. In other words, the actual situation is that it cannot function satisfactorily as a transmitting/receiving antenna with good sensitivity. Furthermore, since the formation of the coil pattern limits the mounting (mounting) area of components, it is not possible to mount many components with high density. In other words, there has been a problem in that it is virtually difficult to add other functions to achieve even higher functionality.

The present invention has been made to solve these problems, and is a non-contact antenna that can widen the aperture area of a coiled antenna for data transmission and reception, and can also increase the mounting area of circuit components. The purpose is to provide input/output type IC cards.

[Configuration of the invention]

[0009]

[Means for Solving the Problems] The IC card of the present invention includes:
In an IC card that includes at least an IC chip and a coiled antenna for data transmission/reception inside, and has an insulating exterior layer on the main surface of the card, the coiled antenna for data transmission/reception is provided on the main surface of the card. It is characterized in that it is formed integrally with the inner surface of at least one of the insulating exterior layers.

0010

[Operation] Usually, an IC card has a label with a design displayed on the front and back of the card body, respectively, and has an exterior finish. In the IC card of the present invention, the back surface (inner side) of such an insulating exterior layer
Furthermore, since the coiled antenna for transmitting and receiving data is integrally formed, the aperture area of the coil can be sufficiently expanded, and the distance over which wireless transmission and reception can be performed can be extended.

Moreover, as a result, the area on the circuit board in which components can be mounted is increased, so more elements or components can be mounted, and higher functionality can be achieved.

0012

Embodiment An embodiment of the present invention will be described below with reference to FIG.

FIG. 1 is an exploded perspective view showing an example of the structure of an IC card according to the present invention. In the figure, 1 is an insulating substrate made of, for example, polyimide resin, on which a required wiring pattern is formed on the main surface. It is a circuit board. The required wiring pattern provided on this circuit board 1 is formed by, for example, selectively etching a copper foil laminated on the surface of the circuit board. In addition, this circuit board 1
At a predetermined position on the main surface, there is an I/O device such as a memory chip for storing information or a microprocessor chip for controlling it.
A C chip 2 and the like are mounted and mounted, and a predetermined electrical connection is made between the C chip 2 and the wiring pattern.

The circuit board 1 on which the IC chip 2 and the like are mounted is mounted on a rectangular frame 4 having a pair of plate-shaped spring hold parts 3 facing each other at one of the four corners. Two spring hold parts 3 are fitted so as to sandwich the board from both upper and lower sides. Furthermore, metal springs 6 are inserted into the two through holes 5 provided in each spring hold portion 3, respectively.

Furthermore, on both main surfaces of the circuit board 1 fitted into the frame 4, there are two outer sheaths each having a conductive coil-like pattern 7 formed on the back surface (inner surface) necessary for a data transmission/reception function. Labels 8 are arranged as shown below. That is, the insulated coil 7 is formed by winding an insulated wire, which is coated with insulation except for the ends at the beginning and end of the winding, around a conductor made of copper, for example, into a ring shape that matches the inner shape of the frame 4. , each label is attached to one side (inner side) with adhesive, etc.
These exterior labels 8 are pasted on both upper and lower end surfaces of the frame 4, with the pasted insulating coils 7 facing inside. The ends 9 of the insulated coils 7 forming these two transmitting and receiving antennas are electrically connected to the connection pads 10 of the circuit board 1 via the metal springs 6 fitted in the spring hold parts 3. It is connected to the.

In the IC card configured as described above, an insulated coil 7 formed by winding an insulated wire in a ring shape to match the inner shape of the frame 4 is incorporated as a coiled antenna for transmitting and receiving data. Become. therefore,
The aperture area of the coiled antenna can be made sufficiently large, and the distance over which data can be transmitted and received wirelessly can be increased. Furthermore, since the insulating coil 7 is attached and integrated on the back surfaces of the two exterior labels 8, which form the front and back sides, the area on the circuit board 1 in which components can be mounted is increased, and more circuit components can be mounted. can be installed.

In the above embodiment, an insulated coil formed by winding an insulated wire in a ring shape is used as the transmitting/receiving coil antenna, and this is attached to the back side of the exterior label 8, so that it can be integrated with the exterior label. However, the same effect can be obtained even if the transmitting and receiving coil portions are formed by printing spiral conductor patterns on the back side of the outer label. Furthermore, the conductor coil serving as the coiled transmitting/receiving antenna may be formed and provided only on the inner surface of one of the exterior labels depending on the selection and setting of the pattern width and overall length.

[0018]

[Effects of the Invention] As explained above, the IC according to the present invention
According to the card, on the inside surface (back side) of the insulating exterior layer,
Since the coiled antenna for data transmission and reception with a large opening area is integrated, the distance over which data can be transmitted and received wirelessly can be extended. Moreover, since the component mounting area on the circuit board is increased, more circuit components can be mounted and high functionality can be achieved.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view showing a configuration example of an IC card of the present invention.

[Explanation of symbols]

Claims (1)

[Claims] 1. An IC card having at least an IC chip and a coiled antenna for transmitting and receiving data built therein, and an insulating outer layer provided on the main surface of the card, wherein the coiled antenna for transmitting and receiving data comprises: An IC card characterized in that the IC card is formed integrally with the inner surface of at least one insulating exterior layer provided on the main surface of the card.