JPH0793493A - Non-contact information identifying card device - Google Patents

Abstract

PURPOSE:To enable executing usage in a wide range and reducing a cost by eliminating IC and a battery. CONSTITUTION:An electric circuit 2 is printed on a thin plate-shape card 1 with thin film aluminum, pulse-shaped electromagnetic wave transmitted from the oscillating part 3 of an independently provided identifying device A is received by the electric circuit 2 of the card mainbody 1 so that reflection wave is radiated. Then, IC, electronic parts, and the battery, etc., are not required to be mounted on the card mainbody 1, thickness can be made extremely thin, a printed circuit 2 is divided and lots of them are arrayed so that information capacity becomes large.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a contactless information identification card device which can be used in a wide range of applications such as ID cards, commuter passes, entrance / exit management, etc., as well as bar codes and magnetic cards for product management.

[0002]

2. Description of the Related Art Conventionally, there are bar codes, magnetic cards and the like as information identification card devices. These are those which are brought into direct contact with a recording medium for identification, and those which emit microwaves from a card reading device and are modulated by the card. There is an active contactless card device that reads information by sending it back.

[0003]

In the conventional information identification card, when the former direct contact is made, the identification may not be possible when the surface of the card is soiled with dust or the like.

Therefore, the latter type of active contactless card has come to be known as a means for eliminating this drawback. However, since this card is equipped with an IC and a battery, the thickness of the card becomes 1 mm or more, Also, the price of one card is 100
The use is limited because it costs 0 yen or more.

[0005]

SUMMARY OF THE INVENTION In view of such circumstances, the present invention addresses this problem by providing a passive non-contact card in which an electric circuit is printed on an ultra-thin plate, eliminating ICs and batteries, and achieving a wide range. The present invention provides a low cost information identification card device.

[0006]

In the contactless information identification card device according to the present invention, the electric circuit 2 is wired in the card body 1, and the pulsed electromagnetic wave transmitted from the transmitter 3 of the separately provided identification device A is printed on the card. Since the reflected wave is radiated when the electric circuit receives it, it is not necessary to mount an IC, an electronic component, a battery or the like on the card, and the thickness of the card can be made extremely thin. Further, the information capacity can be increased by dividing and arranging a large number of printed wiring circuits, and even if there is an obstacle other than metal such as paper or cloth between the card and the identification device, it is not affected.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a diagram showing the configuration of the card device of the present invention.

Reference numeral 1 denotes a card body, for example, a thin plate made of polyethylene, on which an electric circuit 2 is printed and printed with thin film aluminum. Further, this card device is composed of a card body 1 and an identification device A composed of an oscillating unit 3, a receiving unit 4 and a discriminating unit 5. The oscillating unit 3 of the discriminating device A outputs a pulsed electromagnetic wave to an electric circuit 2.
Send to. Here, the reason for using the pulse wave is that, as is apparent from the Fourier series expansion of this pulse wave,
Since the n-th harmonic component (n is an integer) is included in addition to the fundamental frequency component, the n-th resonance frequency current can be easily passed through the electric circuit 2. When the electromagnetic wave transmitted from the oscillating unit 3 interlinks with the electric circuit 2, a current flows in this circuit by electromagnetic induction. The frequency of the current at this time is a resonance frequency determined by these values, although the values of the resistance and the self-inductance of the circuit are changed by changing the shape and thickness of the wiring of the electric circuit 2.

Here, the self-inductance of the electric circuit 2 will be described with reference to FIGS. 2 and 3.

Now, assuming that the electric circuit 2 is wired in the shape of a rectangular flat spiral coil as shown in FIG. 2, the self-inductance L of this coil can be expressed by the following equation. _{^{L = 10¯ 7 × aR 2 N}} 2 (H) provided that, R _1: an inner peripheral length equal inner radius of the circle R _2: of a circle equal outer perimeter outer radius N: Total number of turns a: radius of the coil Function of ratio (R ₁ / R ₂ ) (shown in FIG. 3) The resistance R of the electric circuit 2 can be expressed by the following equation. R = ρl / a (Ω) where ρ: resistivity of coil wire l: length of coil wire a: cross-sectional area of coil wire These resistance R and self-inductance L, and further electric circuit 2
Electromagnetic waves are generated by the high-frequency current of the resonance frequency determined by the slight stray capacitance (the description is omitted) of the wiring of the electric circuit 2.
Emitted more. The radiated reflected wave is received by the receiving unit 4 of the identifying device A, the frequency of the received signal is identified by the identifying unit 5, and the information of the card body 1 is identified.

[0011]

The contactless information identification card device of the present invention comprises:
Since it is non-contact, there is no need to pass the card body through the identification device to read, and the weight of the card body can be made as thin as paper, which is inexpensive and has a wide range of use.

Further, the information capacity can be increased. Further, even if an obstacle other than metal, such as paper or cloth, is present between the identification device and the card body, it is not affected, and there is an effect that the size can be further reduced.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of a card device configuration according to an embodiment of a contactless information identification card device according to the present invention.

FIG. 2 is an explanatory diagram of a flat spiral coil.

FIG. 3 is a diagram showing a function of a radius ratio of a coil.

[Explanation of symbols]

 1 Card Main Body 2 Wiring Circuit 3 Oscillator 4 Receiver 5 Discriminator A Identification Device

Claims (1)

[Claims] 1. A card main body made of an ultra-thin plate made of polyethylene or the like on which an electric circuit is printed and a discriminating device composed of a transmitting part, a receiving part, and a discriminating part. Characteristically, by contact, the electromagnetic wave from the transmitting unit is transmitted to an electric circuit, the reflected wave of the electromagnetic wave emitted from the electric circuit is received by the receiving unit, and the frequency of this signal can be discriminated by the discriminating unit to identify information. Non-contact information identification card device.