JPH0418689A - Ic card system - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an IC card system comprising a non-contact IC card and its terminal device.

[Prior Art] Fig. 3 is a diagram showing the configuration of a non-contact IC card used in a conventional IC card system. FIG. In the figure,] is a contactless IC card, 2 is an IC card body, 3 is an electronic circuit board mounted in the IC card body 2,
Reference numeral 4 indicates a spiral coil formed by etching silver foil on the front surface of the electronic circuit board 3, 5 indicates a spiral coil formed in the opposite direction on the back surface of the electronic circuit board 3, and 6 and 7 indicate spiral coils 4 and 7, respectively. A lead wire 5 and a through hole 8 penetrate through the front and back surfaces of the electronic circuit board 3 and electrically connect the spiral coil 4 on the front side and the spiral coil 5 on the back side.

FIG. 4 is a diagram showing another configuration of a conventional non-contact IC cart, in which FIG. 4(a) is a plan view of the main part, and FIG. 4(b) is a sectional view thereof. In this figure, the difference from Figure 3 is as follows.
Only the spiral coil 4 and its lead wire 6 are formed on the surface of the electronic circuit board 3. Note that 9 is a lead wire of the spiral coil 4.

Fig. 5 is a cross-sectional view of the main parts without showing the configuration of a conventional IC card system. An electronic circuit board, 13 is a spiral coil formed on the surface of the electronic circuit board 12, 14 is a through hole, 15.1
Reference numeral 6 indicates a lead wire of the spiral coil 13 formed on the front and back surfaces of the electronic circuit board 12.

In such a configuration, the contactless IC card 1 is placed close to the terminal device 10 in a non-contact state with both spiral coils 13 and 4 facing each other, and is electromagnetically coupled to the terminal device 10 in a non-contact manner. Electric power is supplied to the contact IC card 1, and the terminal device 1 is also supplied from the non-contact IC card 1-.
Signals etc. are supplied to 0.

In addition, as another configuration, as shown in FIG. 6, two sets of spiral coils 1.
3a, ], 3b are implemented, and the contactless I
In principle, the electromagnetic energy to C card 1 was doubled.

[Problems to be Solved by the Invention] However, in the conventional C card system, the number of coil turns of the spiral coil 4.5 on the non-contact IC card 1 side and the spiral coil 13 on the terminal device 10 side is limited. In the configuration in which the spiral coils are made the same, it is possible to design the spiral coil only once and transfer the same pattern to each of the electronic circuit boards 3 and 12J- of the terminal device 10 and the non-contact IC card 1. On the other hand, the spiral coil 4°5.1 of the non-contact IC card 1 and the terminal device 10
3 have the same number of turns, that is, the same dimensions, for example, when electromagnetic energy is supplied from the terminal device 10 to the non-contact IC card 1, the magnetic flux spreads radially, so the spiral coil of the non-contact IC card 1- It is important that magnetic fluxes 4 and 5 cross these magnetic fluxes efficiently. In other words, since the magnetic flux density is inversely proportional to the cube of the distance from the spiral coil that emits the magnetic flux, it is necessary to increase the number of turns of the spiral coil on the side that receives power and signals.

Non-contact IC cards are generally portable, thin, and have no built-in power supply or a very small-capacity power supply. Therefore, the contactless IC card 1 that receives power or signals from the terminal device 1.0 changes the number of coil turns so that the number of magnetic fluxes radiated from the spiral coil 13 of the terminal device 1.0 crosses the terminal device 1.0.
Efficient propagation of power and signals is possible by increasing the number of spiral coils 13 or by increasing the number of spiral coils 4 mounted.

[Means for Solving the Problems 1] In order to solve such problems, the IC card system according to the present invention has the following advantages: The number of turns is relatively greater than the number of turns.

[Function] In this invention, by making the number of turns of the spiral coil on the non-contact IC card side relatively larger than the number of turns of the spiral coil on the terminal device side, the AC waveform induced thereby The peak value of the voltage becomes high, and due to the principle of boosting, power and signals are efficiently supplied to the contactless IC card.

[Example] Hereinafter, an example of the present invention will be described in detail using the drawings.

FIG. 1 is a sectional view of essential parts showing the configuration of an embodiment of the IC card system according to the present invention, and the same parts as in the previous figures are given the same reference numerals. In the figure, the non-contact IC card IA has a spiral coil 4A having a larger number of coil turns and a larger coil diameter than the spiral coil 13 of the terminal device 10 on the surface of the electronic circuit board 3 mounted therein. is formed by etching copper foil.

In other words, if the number of turns of the spiral coil 13 on the terminal device 1-0 side is N1, and the number of turns of the spiral coil 4A on the non-contact IC cart IA side is N2, there is a relationship of N,<N2, and the number of turns is N1. The spiral coil 4A on the contact IC card 1A side has a larger number of turns.

According to such a configuration, the peak value of the AC waveform applied to the spiral coil 13 on the terminal device 10 side is 1, and the peak value of the AC waveform induced in the spiral coil 4A of the non-contact IC card 1A is V2, in principle (ideally), assuming that all the electromagnetic flux generated from the terminal device 1-0 side crosses the spiral coil 4A on the non-contact IC cart IA side, the peak value V2 is N2/ An alternating current waveform proportional to Nl is induced. That is, if N1 becomes N2, an induced voltage of Vl<V2 will be obtained.

FIG. 2 is a sectional view of a main part showing the configuration of another embodiment of the IC card system according to the present invention, and the same parts as in the previous figures are given the same reference numerals.

In the figure, the contactless IC card IB includes a terminal device 1.
Two sets of spiral coils 4, a, 4b having the same number of turns and coil diameter as the spiral coil 13 on the 0 side are mounted, and the respective coil lead wires 6a, 6b are mounted.
are connected in pairs so that the polarity of the induced voltage is the same.

According to such a configuration, the number of coil turns of the two sets of spiral coils 4a and 4b on the non-contact IC car 1 IB side is larger than that of the spiral coil 3 on the terminal device 10 side, and therefore the induced voltage waveform The wave height values of are almost the same, and the sum of the respective currents can be obtained, and the non-contact IC card 1B
The power supplied to the side can be increased.

[Effects of the Invention] As explained above, the present invention provides a non-contact I by increasing the number of spiral coil turns on the non-contact rc card side than the number of spiral coil turns on the terminal device example 1.
Since the C card is efficiently electromagnetically coupled to the terminal device, extremely excellent effects such as efficient propagation of power and signals can be obtained. In addition, by mounting a large number of spiral coils on the non-contact IC card side, the currents induced in these spiral coils are arithmetically added, resulting in a large amount of power being supplied from the terminal device. An extremely excellent effect can be obtained.

[Brief explanation of drawings]

FIG. 11 is a sectional view of a main part showing the configuration of one embodiment of the IC card system according to the present invention, FIG. 2 is a sectional view of main parts showing the structure of another embodiment of the IC card system according to the invention, FIG. FIG. 4 is a sectional view of a main part showing the structure of a conventional IC card, and FIGS. 5 and 6 are sectional views of main parts showing the structure of a conventional IC card system. ], A, IB...Non-contact IC card, 2-IC card body, 3.3a, 3b, 12...Electronic circuit board, 4A
, 4a, 4b, 13... spiral coil, 5,
8.8a. 8b, 11 --- Through hole, 6.6a, 6b, 9
．． 9a, 9b, 15.16-...Leader line, 10
...Terminal device, 11...Terminal device main body. Agent Masuo Oiwa＼T

Claims (1)

[Claims] An I that includes a contactless IC card to which signals and power are supplied by electromagnetic coupling, and a terminal device that performs a functional operation by combining the contactless IC card and the electromagnetic coupling in a contactless manner.
C card system, wherein the electromagnetic coupling means is a spiral coil, and the number of coil turns on the non-contact IC card side is greater than the number of coil turns on the terminal device side.