JP2010093724A - Id chip, information recording medium and communication system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an ID chip which has a simple configuration and is capable of easily increasing kinds of identification information that can be imparted and suppressing the price low, and to provide an information recording medium and communication system. <P>SOLUTION: An ID chip includes a base 4 constituted of an insulated material and a conductive coil 5 which is provided on a surface of the base 4, has an open end and is resonated with an electromagnetic wave propagated in air at a specific frequency equal to or higher than 0.01 GHz. The coil 5 may also be cut partially and lengths of a plurality of portions divided by cutting may also be different from each other. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an ID chip that resonates with an electromagnetic wave propagating in the air, an information recording medium, and a communication system that performs communication using the ID chip.

  Conventionally, as a technique for authenticating a medium such as a credit card, banknote, securities, etc., an ID chip on which an LC resonance circuit is formed is embedded in the medium, and the intensity of the reflected wave by the ID chip when an electromagnetic wave is emitted. A technique is known in which the resonance frequency of the LC resonance circuit is detected based on the above and the identification information corresponding to the resonance frequency is read (see, for example, Patent Document 1). In this technique, a coil having a winding pattern is provided on the surface of an insulating substrate by a silicon process or an etching process, and an LC resonance circuit is formed by connecting capacitor elements to both ends of the coil.

JP 2008-135951 A

  However, in the above-described prior art, in order to connect the capacitor elements to form a closed circuit, a part of the wiring must be crossed three-dimensionally, and there is a problem that the configuration is complicated.

  In addition, when increasing the types of identification information stored in the ID chip with the above-described prior art, it is necessary to form a plurality of LC resonance circuits having different resonance frequencies. For this purpose, a coil pattern or Capacitor elements had to be changed and a great deal of effort had to be spent.

  In addition, the above two problems have caused an increase in manufacturing cost, making it difficult to keep the price low.

  The present invention has been made in view of the above, and has an ID chip and an information record that have a simple configuration, can easily increase the types of identification information that can be provided, and can keep the price low. It is an object to provide a medium and a communication system.

  In order to solve the above-described problems and achieve the object, an ID chip according to the present invention is provided on a base material made of an insulating material and on the surface of the base material, has an open end, and is 0.01 GHz or more. And a conductive coil that resonates with an electromagnetic wave propagating in the air at a specific frequency.

  The ID chip according to the present invention is characterized in that, in the above invention, a part of the coil is cut.

  The ID chip according to the present invention is characterized in that, in the above-mentioned invention, the coils have different lengths from each other by cutting.

  The ID chip according to the present invention is characterized in that, in the above invention, a plurality of the coils are provided.

  An information recording medium according to the present invention includes one or a plurality of ID chips according to any one of the above-described inventions.

  Further, the communication system according to the present invention is provided on the surface of the base material made of an insulating material, has an open end, and propagates in the air at a specific frequency of 0.01 GHz or more. An ID chip including a conductive coil that resonates with an electromagnetic wave, and a transmitter that emits an electromagnetic wave having a frequency in a predetermined band of 0.01 GHz or more as a transmission wave while sweeping the frequency in the predetermined band; A receiving unit that receives a reflected wave of the transmission wave reflected by the ID chip, and identification information corresponding to a frequency at which the coil resonates is detected based on the intensity of the reflected wave received by the receiving unit for each frequency. And a reading device including a detecting unit.

  According to the present invention, a base material made of an insulating material, and provided on the surface of the base material, has an open end, and resonates with an electromagnetic wave propagating in the air at a specific frequency of 0.01 GHz or more. Therefore, without providing a capacitor, an ID chip that can resonate with high-frequency electromagnetic waves can be configured, and the resonance frequency can be easily adjusted. Therefore, it has a simple configuration, and the types of identification information that can be given can be easily increased, and the price can be kept low.

  The best mode for carrying out the present invention (hereinafter referred to as “embodiment”) will be described below with reference to the accompanying drawings. Note that the drawings referred to in the following description are schematic, and when the same object is shown in different drawings, dimensions, scales, and the like may be different.

(Embodiment 1)
FIG. 1 is a diagram showing a configuration of a communication system according to Embodiment 1 of the present invention. The communication system 1 shown in FIG. 1 radiates an ID chip 2 to which predetermined identification information is given and an electromagnetic wave in a predetermined band having a frequency of 0.01 GHz or more while sweeping the frequency in the predetermined band. And a reading device 3 that reads identification information of the ID chip 2 based on the intensity of each reflected wave reflected by the chip 2 for each frequency.

  The ID chip 2 includes a base material 4 having a rectangular parallelepiped shape and a coil 5 provided on the surface of the base material 4 and having an open end. The base material 4 is formed using an insulating material such as silicon. The coil 5 is formed using a conductive material such as aluminum or copper.

  FIG. 2 is a plan view showing the configuration of the ID chip 2. The coil 5 is cut in the middle of winding and divided into two. That is, the coil 5 is divided into a long portion 5a having a relatively long winding length and a short portion 5b having a relatively short winding length, with the cut portion 5C as a boundary.

で与えられる。短尺部５ｂに対して浮遊容量を考慮した回路も、回路１００と同様の共振回路を形成する。この場合の共振周波数ｆ_bは式（１）と同様に与えられるが、Ｌ，Ｃ₁，Ｃ₂の値は回路１００の場合と異なる。 In general, it is known that when an alternating current having a frequency of 0.01 GHz or more flows in a coil, stray capacitance generated at both ends and stray capacitance between coil windings cannot be ignored. FIG. 3 is a diagram showing a configuration of a circuit including the long portion 5a in consideration of these stray capacitances. The circuit 100 shown in FIG. 3 includes a capacitor 6 having a capacitance C ₁ corresponding to the stray capacitance at both ends of the long portion 5a (inductance is L) and a combined capacitance of stray capacitance between the windings of the long portion 5a. And a capacitor 7 having a capacitance C ₂ corresponding to the above are connected in parallel to the long portion 5a, and have a circuit configuration equivalent to an LC resonance circuit (hereinafter simply referred to as “resonance circuit”). . The resonant frequency f _a of the circuit 100 is

Given in. A circuit in which stray capacitance is taken into consideration for the short portion 5 b also forms a resonance circuit similar to the circuit 100. The resonance frequency f _{b in} this case is given in the same manner as in equation (1), but the values of L, C ₁ , and C ₂ are different from those in the circuit 100.

The resonance frequencies f _a and f _b of the two resonance circuits derived from the long portion 5a and the short portion 5b are determined according to the position of the cut portion 5C. The two resonance frequencies f _a and f _b satisfy the relational expression f _a > f _b because the long portion 5a has a larger inductance than the short portion 5b.

The ID chip 2 having the above configuration forms a winding pattern to be the base 4 and the coil 5 by performing a silicon process, an etching process, a plating process, or the like, and then the winding pattern is placed at a predetermined position by laser processing or the like. It is formed by cutting with. The position and length of the cut portion 5C are determined according to the set resonance frequencies f _a and f _b . The length of one side of the substrate 4 thus formed is more preferably about several tens to several hundreds of μm.

  The reading device 3 includes a transmission unit 31 that emits an electromagnetic wave in a predetermined band having a frequency of 0.01 GHz or more as a transmission wave while sweeping the frequency in the predetermined band, and a transmission wave reflected by the ID chip 2. The receiving unit 32 that receives the reflected wave, the detection unit 33 that detects the identification information of the ID chip 2 based on the intensity of the reflected wave received by the receiving unit 32, and the frequency of the electromagnetic wave that the transmitting unit 31 sweeps An input unit 34 that receives input of information for setting a band, an output unit 35 that outputs information including a detection result of identification information detected by the detection unit 33, a control unit 36 that controls the operation of the reading device 3, And a storage unit 37 that stores a correspondence relationship between the resonance frequency and the identification information that is referred to when the detection unit 33 detects the identification information. When the reading device 3 has an identification information authentication function, the identification information of the ID chip 2 to be read may be input from the input unit 34.

When the minimum value of the frequency band of the transmission wave radiated by the transmission unit 31 is f _min (≧ 0.01 GHz) and the maximum value is f _max , these values are the long part 5a and the short part of the ID chip 2. It is set so as to satisfy f _min <f _a <f _max <f _b between the resonance frequencies f _a and f _{b of} the resonance circuit respectively derived from 5b. In this way, by setting the frequency band f _min ≦ f ≦ f _max and the resonance frequencies f _a and f _b of the transmission wave, the reading device 3 detects only the resonance frequency f _a of the circuit 100, and the reading is performed. It becomes possible to speed up processing. The minimum value f _min and the maximum value f _max can be set, for example, as f _min = 0.01 GHz and f _max = 100 GHz.

FIG. 4 is a diagram illustrating the relationship between the frequency and intensity of the reflected wave received by the reading device 3. In FIG. 4, the horizontal axis indicates the frequency f of the reflected wave, and the vertical axis indicates the intensity I of the reflected wave. Intensity I of the reflected wave receiving section 32 receives, while taking the minimum value I _min is attenuated in the resonant frequency f _a of the circuit 100, substantially takes a constant value I ₀ at frequencies other than the resonance frequency f _a. The intensity I of the reflected wave is minimum at the resonant frequency f _a, the circuit 100 in this case resonates in combination with the electromagnetic wave, electromagnetic wave energy is because the induced current flows is transmitted to the circuit 100. Detection unit 33 detects the identification information of the ID chip 2 by reading the identification information corresponding to the value of the resonant frequency f _a from the storage unit 37.

By the way, in FIG. 4, the intensity of the reflected wave in the frequency band where the frequency f is larger than f _max and the reading device 3 does not read is virtually indicated by a one-dot chain line. This relationship between the virtual frequency and the intensity is reflected by the resonance frequency f _b of the resonance circuit derived from the short portion 5b when the reading device 3 radiates an electromagnetic wave while sweeping the frequency to a band of f> f _max. It shows that the intensity of the wave is reduced.

  FIG. 5 is a diagram showing a configuration of a non-contact type information recording medium as an application example of the ID chip 2. The information recording medium 8 shown in the figure is an ID card, and a chip area 81 in which one or a plurality of ID chips 2 are embedded is provided on a resin base material. When the reader 3 reads such identification information of the information recording medium 8, the transmitter 31 radiates electromagnetic waves to the chip area 81.

  The identification information of the information recording medium 8 is determined according to the type of identification information that can be given to the ID chip 2 and the number of ID chips 2 embedded in the chip area 81. For example, assuming that there are 10 types of identification information that can be given to the ID chip 2, when the number of ID chips 2 embedded in the chip area 81 is 1, 10 types of identification information are assigned to the information recording medium 8. Can be granted. Similarly, when the number of ID chips 2 embedded in the chip area 81 is 2, 55 types of identification information can be given to the information recording medium 8, and the number of ID chips 2 embedded in the chip area 81 is 3 In this case, 175 kinds of identification information can be given to the information recording medium 8. Here, when three ID chips 2 are embedded in the chip region 81, the degree of overlap when the resonance frequencies overlap among the three is not considered.

  The ID chip 2 can also be applied to information recording media other than ID cards. For example, the information recording medium may be realized by mixing the ID chip 2 into a paper medium or the like. Further, the information recording medium may be realized by mixing the ID chip 2 in the printing ink and printing the ink on a paper medium or the like.

  According to the first embodiment of the present invention described above, the base material 4 made of an insulating material and the air is provided on the surface of the base material 4 and has an open end at a specific frequency of 0.01 GHz or more. Since the conductive coil 5 that resonates with the electromagnetic wave propagating therethrough is provided, an ID chip capable of resonating with a high-frequency electromagnetic wave can be formed without providing a capacitor, and the resonance frequency can be adjusted. Is also easy. Therefore, it has a simple configuration and can easily increase the types of identification information that can be given, thereby reducing the manufacturing cost and keeping the price low. As a result, the forgery prevention property can be improved.

  Further, according to the first embodiment, since the manufacturing method can be simplified and the yield can be improved, also in this sense, the manufacturing cost can be reduced and the price can be kept low.

(Embodiment 2)
FIG. 6 is a plan view showing the configuration of the ID chip according to the second embodiment of the present invention. The ID chip 9 shown in the figure corresponds to a structure in which three ID chips 2 are arranged, and three coils 51 to 53 are arranged side by side on one base material 10. The coils 51 to 53 are each cut and divided into two parts. Specifically, the coil 51 is divided into a long part 51a and a short part 51b by a cutting part 51C, the coil 52 is divided into a long part 52a and a short part 52b by a cutting part 52C, and the coil 53 is a cutting part. The long portion 53a and the short portion 53b are divided by 53C. The winding patterns before cutting of the coils 51 to 53 are all the same, but the cutting points 51C to 53C are different from each other. Since the resonance frequencies of the three resonance circuits respectively derived from the long portions 51a to 53a change according to the cut portions, the identification information of the ID chip 9 is determined by the combination of the three cut portions.

  Also in the second embodiment, the resonance frequency of the resonance circuit derived from each of the short parts 51b to 53b is set to be outside the frequency band of the transmission wave radiated from the transmission part 31 of the reading device 3. Shall. Moreover, in FIG. 6, although the case where the cutting | disconnection locations 51C-53C mutually differ is shown, some or all of them may be the same.

FIG. 7 shows the reflected wave received by the reader 3 when the reader 3 radiates electromagnetic waves while sweeping the frequency f in the band of f _min ≦ f ≦ f _max with respect to the ID chip 9 having the above configuration. It is a figure which shows the relationship between the frequency f and the intensity | strength I. FIG. In FIG. 7, the intensity I of the reflected wave is greatly attenuated at three frequencies f ₁ , f ₂ , and f ₃ . The three frequencies f ₁ , f ₂ , and f ₃ correspond to any of the resonance frequencies of the three resonance circuits derived from the long portions 51a to 53a, respectively. The detection unit 33 detects the identification information of the ID chip 9 by reading the identification information corresponding to the combination of the _three resonance frequencies f ₁ , f ₂ , and f ₃ from the storage unit 37.

  The ID chip 9 may be embedded in the chip area 81 of the information recording medium 8 described in the first embodiment. In this case, the same number of ID chips 2 as the coils of the ID chip 9 can be embedded in the chip area 81 more efficiently.

  According to the second embodiment of the present invention described above, after the plurality of coils 51 to 53 are formed on the surface of the substrate 10 and the coil pattern is formed at the wafer level, the control of the coil cutting position is regularly performed. And can be done easily. In addition, when the ID chip 9 is embedded in the chip area 81 of the information recording medium 8, the same number of ID chips 2 as the coils of the ID chip 9 can be embedded in the chip area 81 more efficiently. Therefore, the ID chip 9 and the information recording medium 8 can be manufactured more quickly, and the manufacturing cost can be further reduced.

  So far, the first and second embodiments have been described in detail as the best mode for carrying out the present invention, but the present invention should not be limited only by these embodiments. For example, the coil pattern may be cut at a plurality of locations. In this case, the lengths of the divided parts are preferably different from each other, but some or all of them may have the same length.

  Further, the frequency band of the electromagnetic wave radiated from the reading device can be arbitrarily set as long as it is 0.01 GHz or more. In this sense, when the coil is cut in two, only the resonance frequency of the resonance circuit derived from the short part may be detected, or the resonance of the two resonance circuits derived from the long part and the short part, respectively. The frequency may be detected.

  Thus, the present invention can include various embodiments and the like not described herein, and various design changes and the like can be made without departing from the technical idea specified by the claims. It is possible to apply.

It is a figure which shows the structure of the communication system which concerns on Embodiment 1 of this invention. It is a top view which shows the structure of the ID chip which concerns on Embodiment 1 of this invention. It is a figure which shows the circuit equivalent to ID chip concerning Embodiment 1 of this invention. It is a figure which shows the relationship between the frequency and intensity | strength of the reflected wave reflected by ID chip concerning Embodiment 1 of this invention. It is a figure which shows the structure of the information recording medium which concerns on Embodiment 1 of this invention. It is a top view which shows the structure of the ID chip which concerns on Embodiment 2 of this invention. It is a figure which shows the relationship between the frequency and intensity | strength of the reflected wave reflected by ID chip concerning Embodiment 2 of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Communication system 2, 9 ID chip 3 Reading device 4, 10 Base material 5, 51, 52, 53 Coil 5a, 51a, 52a, 53a Long part 5b, 51b, 52b, 53b Short part 5C, 51C, 52C, 53C Cutting location 6, 7 Capacitor 8 Information recording medium 31 Transmitting unit 32 Receiving unit 33 Detection unit 34 Input unit 35 Output unit 36 Control unit 37 Storage unit 81 Chip area 100 Circuit

Claims (6)

A base material made of an insulating material;
A conductive coil that is provided on the surface of the substrate, has an open end, and resonates with an electromagnetic wave propagating in the air at a specific frequency of 0.01 GHz or more;
An ID chip comprising:   The ID chip according to claim 1, wherein a part of the coil is cut.   The ID chip according to claim 2, wherein the coil has different lengths from each other by cutting.   The ID chip according to claim 1, wherein a plurality of the coils are provided.   An information recording medium comprising one or a plurality of ID chips according to claim 1. A base material made of an insulating material, and a conductive coil that is provided on the surface of the base material, has an open end, and resonates with an electromagnetic wave propagating in the air at a specific frequency of 0.01 GHz or more. An ID chip provided;
A transmission unit that emits an electromagnetic wave having a frequency in a predetermined band of 0.01 GHz or more as a transmission wave while sweeping the frequency in the predetermined band, and a reflected wave of the transmission wave reflected by the ID chip is received. A reader comprising: a receiver; and a detector that detects identification information corresponding to the frequency at which the coil resonates based on the intensity of each frequency of the reflected wave received by the receiver;
A communication system comprising:

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