JP2008067057A - Ic tag auxiliary device, and method for using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for solving the problem that the shapes and sizes of antennas for a reader/writer and an IC tag are restricted, so that it is inevitable that communication performance or communication condition is limited depending on mutual position relation between the reader/writer and the IC tag due to the restriction, concerning an apparatus for controlling objects or managing distribution using the IC tag. <P>SOLUTION: An auxiliary device to be a booster coil is formed on a base material having a prescribed size of area between the reader/writer and the IC tag. That is, the antenna with a large area is formed for communicating with the reader/writer, so as to form one coil by connecting a small size antenna for communicating with the IC tag to the former antenna. A capacitor is connected to the obtained pair coil so as to obtain resonance. Consequently, a band pass characteristic is obtained and the booster coil is formed. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an auxiliary device for relaxing communication conditions between an IC tag and a reader / writer when using an IC tag, and facilitating signal exchange.

  IC tags are currently being introduced mainly in many distribution systems. This is achieved by simply and accurately realizing integrated logistics management by checking the specific information and location information of these monitored objects in the distribution system by attaching them to monitored objects such as goods / equipment or storage shelves / buildings. An IC tag is used as a communication means of an RFID (Radio Frequency Identification) system.

  As a radio frequency used in such a system, a wide frequency band ranging from an LF (125 kHz) band, an HF (13.56 MHz) band, a higher frequency UHF band, and an EHF band (2.4 GHz) band is used. Generally, the lower the frequency used, the narrower the distance between the reader / writer side antenna and the IC tag side antenna attached to the management object, but the ability to read information about individual IC tags increases. . On the other hand, at high frequencies above the UHF band, the above-mentioned antenna interval is widened and remote monitoring becomes easy. However, when a plurality of IC tags are present in a relatively dense manner, each tag is separated. The ability to recognize is reduced.

  In other words, since the two antennas are close to each other on the low frequency side, the IC tags can be separated and recognized even if the IC tags are dense, but the relative positions of the IC tags with respect to the reader / writer must be aligned. Therefore, the worker had to perform monitoring and relocation work for this purpose. On the high frequency side, one IC tag must be provided in the effective operation area (in the service area) of the reader / writer side antenna.

  For example, if the object to be managed is a transport container, if an IC tag is attached to a certain surface, the object to be managed, that is, a plurality of transport containers existing in close proximity that are subject to processing such as content check or classification, etc. I had to make sure that the arrangement of the faces was aligned. As a countermeasure against this, Patent Document 1 below discloses a configuration in which a coil serving as a loop antenna is formed along the outer peripheral portion of the transport container, and the reader / writer is communicated via the loop antenna. According to this configuration, since there are conductor wires serving as antennas on the four surfaces around the transport container, the arrangement (placement) of the transport container relative to the antenna on the reader / writer side, that is, regardless of the position of the IC tag, is good. It is possible to keep the communication conditions.

In general, many IC tags are relatively small, and in this case, there is a problem that they are easily affected by the relative positional relationship between the reader / writer and the IC tag. That is, the positional relationship must be maintained so that the IC tag accurately enters the service area of the reader / writer antenna. For example, when an IC tag is attached to one surface of the above-mentioned transport container, the same surface as the first container comes to another series of transport containers to be processed or checked for contents. You must align the array so that The above loop antenna was invented as a solution to this. On the other hand, when an IC tag is attached to an attachment body (management target) having a curved surface such as a cylindrical shape or a spherical shape, the smaller IC tag can be easily adapted to the radius of curvature of the attachment body to which the IC tag is applied. The demands on the shape of the are alleviated. As described above, the conventional IC tag utilization device requires a wide transmission / reception area on the one hand, and requires a small IC tag on the other hand, and includes contradictory conditions.
JP 2005-348030 A

  As described above, in the conventionally known method, there is a limitation on the shape and size of the antenna on the IC tag side, which limits the communication performance or communication conditions depending on the mutual positional relationship between the IC tag and the reader / writer. I couldn't avoid it. For this reason, at least on either the reader / writer side or the IC tag side, for example, it has been required to widen the effective radiation area of the antenna and relax the limit of the communication performance due to the mutual positional relationship. In the present invention, such a problem is solved by a simple method, enabling stable communication with good reading accuracy regardless of fluctuations in the mutual positional relationship between the IC tag and the reader / writer. An object of the present invention is to provide an IC tag auxiliary device that can be easily attached to a shape management object.

  In order to achieve the above object, the present invention has the following configuration as a basic configuration. That is, in the first aspect of the invention, there is provided an IC tag auxiliary device having a second coil that is electromagnetically coupled at the same frequency with the first coil of the IC tag and the third coil of the reader / writer. In order to couple the second coil to the first coil and the third coil, the second coil is dividedly wound into the second coil A and the second coil B having the same winding direction. The second coil B is larger than the second coil A, and the second coil A is formed at a predetermined position inside the second coil B on the insulating flat plate base material. One end of the second coil A not connected to the second coil B and one end of the second coil B not connected to the second coil A are connected via a capacitor. And connect the capacitor Defines the set IC tag assisting device configured to band-pass filter by to tune at the same frequency as the frequency of the electromagnetically coupled to said second coil.

  In Claim 2, in the IC tag auxiliary | assistance apparatus of Claim 1, it has prescribed | regulated about the structure which used the flexible sheet-like material as said insulating flat base material.

  According to a third aspect of the present invention, in the IC tag auxiliary device according to the first or second aspect, a resonance frequency additionally generated by a line-to-line capacitance of at least one of the second coils A and B is: It defines an IC tag auxiliary device in which the winding interval is set so that it is outside the tuning frequency band used in the second coil.

  According to a fourth aspect of the present invention, in the IC tag auxiliary device according to any one of the first to third aspects, the first electrode is disposed on the coil forming surface of the insulating flat plate base material, and is opposite to the coil forming surface. A second electrode is disposed at a position facing the first electrode on a side surface, the first electrode is connected to one of the non-connected ends of the second coils A and B by a conductive wire, and the first electrode The electrode of 2 penetrates a conducting wire to the coil surface side of the insulating flat plate base material through a through hole provided in the insulating flat plate base material, and is connected to the other non-connected end of the second coils A and B. Thus, the IC tag auxiliary device in which the capacitor is formed is defined.

  In Claim 5, It is an IC tag auxiliary | assistance apparatus which has a 2nd coil couple | bonded with the 1st coil which an IC tag has, and the 3rd coil which a reader / writer has respectively electromagnetically same frequency, The second coil is wound around a cylindrical bobbin, and the second coil has the same winding direction on the bobbin so as to be coupled to the first coil and the third coil, respectively. The coil A and the second coil B are divided and wound, the second coil A and the second coil B are formed around one cylindrical insulating base material, and the IC tag is formed in the cylindrical shape. One end on the side of the second coil A that is not connected to the second coil B at the position where the second coil A is wound on the insulating substrate; The second coil at the winding end of the second coil B One end of the capacitor not connected to the first coil is connected via a capacitor, and the capacitance of the capacitor is set to be tuned to the same frequency as the electromagnetic coupling frequency with respect to the second coil. Stipulates an IC tag auxiliary device constituting a band-pass filter.

  In claim 6, in the IC tag auxiliary device according to claim 5, a rod-shaped insulating base material is used instead of the cylindrical insulating base material, and the IC tag is attached to the end surface portion of the rod-shaped base material or the An IC tag auxiliary device installed inside the second coil A and on the surface of the rod-like base material is defined.

  In claim 7, using the IC tag auxiliary device according to any one of claims 1 to 6, an IC tag is installed in the vicinity of the second coil A, and a reader / writer is installed in the vicinity of the second coil B. The reader / writer 3 is brought close to each other, and a signal of a predetermined frequency is transmitted from the reader / writer side. The transmission signal is received by the IC tag auxiliary device and simultaneously transmitted to the IC tag by electromagnetic coupling. It defines a method for using an IC tag auxiliary device that reads information recorded on a tag, and receives and outputs the read IC tag information by the reader / writer via the IC tag auxiliary device.

  According to another aspect of the present invention, the reader / writer side predetermines a management object to which the IC tag with the IC tag auxiliary device interposed is mixed with a management object to which the IC tag is attached by a conventional method. For a management object to which an IC tag attached with an IC tag with an IC tag auxiliary device is transmitted via the IC tag auxiliary device, and for a management object to which the IC tag is attached by a conventional method, the IC tag auxiliary device is interposed. It defines a method of using an IC tag auxiliary device that reads information recorded on the IC tag by a signal sent from the reader / writer according to a conventional method.

  According to the first aspect of the present invention, the restriction on the mutual positional relationship between the reader / writer and the IC tag at a low frequency can be relaxed, and the working efficiency can be improved. That is, reading can be performed if a part of the second coil B and the third coil of the reader / writer are electromagnetically coupled. Therefore, if the second coil B is formed in a large area, a part of the second coil B is included. The information of the IC tag can be read out only by approaching the reader / writer. Therefore, if an IC tag auxiliary device on a flat plate is placed or attached to a management object, information on the IC tag can be read accurately even if the position and interval of the reader / writer are slightly deviated.

  Further, according to the second aspect, the restriction on the shape of the object to which the IC tag is attached is relaxed, and the applicable range of the present apparatus can be expanded.

  Further, according to claim 3, it is possible to reduce the mixing of noise in the communication frequency band, and it is possible to improve the reading accuracy of the data recorded in the IC tag.

  According to the fourth aspect of the present invention, it is not necessary to provide an external capacitor for the tuning circuit, and the application range of the device according to the present invention can be expanded.

  According to claim 5, it is possible to expand the application range of the apparatus according to the present invention to a cylindrical one, and according to claim 6, the substrate is used not only in a cylindrical shape but also in a rod-shaped equipment. The scope of application is further expanded.

  Further, claims 7 and 8 extend the method of using the IC tag auxiliary device according to the present invention. In particular, according to the eighth aspect of the present invention, the IC tag information can be stored even in a state where the management object attached with the IC tag with the IC tag auxiliary device of the present invention interposed therein and the management object attached with the IC tag by the conventional method are mixed. Since reading is possible, the application range of the present invention can be expanded.

  Hereinafter, the details of the present invention will be described with reference to the drawings. FIG. 1 shows an RFID system configuration using an IC tag auxiliary device 1 according to the present invention. This RFID system is an IC tag, also called a booster antenna according to the present invention, in order to stably read the data recorded on the IC tag 2, the reader / writer 3 for reading the data recorded on the IC tag 2, and the data recorded on the IC tag 2. It consists of an auxiliary device 1. In the conventional RFID system, since the data recorded on the IC tag 2 is directly read out by the reader / writer 3, the data reading position of the reader / writer 3 is limited by the size of the IC tag 2. For this reason, the interval between the IC tag 2 and the reader / writer 3 cannot be widened, and the mutual positional relationship between them is restricted, which is a problem in the article management work. The present invention implements an IC tag auxiliary device that increases the effective radiation area of the IC tag 2 in order to solve this problem. In this configuration, the data recorded on the IC tag 2 is read using the IC tag auxiliary device 1 as follows.

  That is, in FIG. 1, a signal having a predetermined power and a predetermined frequency is transmitted from the reader / writer 3 side to the IC tag auxiliary device 1 according to the present invention, and this signal is transmitted from the third coil 7 on the reader / writer 3 side. This signal is received by the second coil B6 on the IC tag auxiliary device 1 side that is transmitted and electromagnetically coupled to the third coil 7. Here, in the IC tag auxiliary device 1, the coil 2 is divided into two coils in order to ease restrictions on the mutual positional relationship when data and power are exchanged between the reader / writer 3 and the IC tag 2. In order to efficiently perform electromagnetic coupling with the IC tag 2, the (second coil A) has a size close to the size of the IC tag 2, and the IC tag 2 is installed in the vicinity of the second coil A, and the other coil The (second coil B) is made as large as the base material 8 permits, and the third coil, which is the pickup coil of the reader / writer 3, is brought close to the second coil B to read information. With this configuration, the restriction on the mutual positional relationship can be relaxed.

  Here, in the IC tag auxiliary device 1, the second coil A5 and the second coil B6 together with the capacitor 9 constitute a tuning circuit having resonance characteristics, and transmitted from the reader / writer 3 side by this tuning circuit. In addition, a signal of a desired frequency band is selectively received, and at the same time, it acts as a booster coil using the resonance characteristics. This received signal is sent to the IC tag 2 through the first coil 4 that is also electromagnetically coupled to the second coil A5. In this process, the received signal also includes a power component that drives the IC tag 2. The IC tag 2 is activated by this power, and the data recorded in the IC tag 2 is read out to follow the forward path. Are received by the reader / writer 3 via the IC tag auxiliary device 1.

  As described above, in the configuration of FIG. 1, reading is possible if a part of the second coil B and the third coil of the reader / writer are electromagnetically coupled, so that the second coil B has a large area. If it is formed, the information of the IC tag can be read out only by approaching a part of the reader / writer. Therefore, if the IC tag auxiliary device is placed or attached to the management object, the information of the IC tag can be read accurately even if the position of the reader / writer is slightly shifted. For example, if an IC tag auxiliary device on a flat plate is inserted into the bottom or side of a transport container (cardboard box, etc.) in a logistics system, or an IC tag auxiliary device is placed on a transport container, the reader / writer The IC tag information can be accurately read out only by passing around the IC tag auxiliary device. Therefore, when information is read while moving a large number of transport containers on a conveyor line or the like, the information can be read accurately even if the distance or position between the reader / writer and the transport container is slightly shifted.

  In addition, since the distance between the reader / writer 3 and the IC tag 2 can be increased by using the IC tag auxiliary device according to the present invention, the IC tag auxiliary device according to the present invention is placed on the same line on which the reading process is performed. It becomes possible to mix the management object of the conventional reading means (for example, the said Unexamined-Japanese-Patent No. 2005-348030) which is not used. That is, in a state where the management object to which the IC tag with the IC tag auxiliary device is attached and the management object to which the IC tag is attached by the conventional reading means are mixed, the reader / writer side has a predetermined frequency. For the management object to which the IC tag is attached and the IC tag is attached via the IC tag auxiliary device, the management object to which the IC tag is attached by the conventional reading means is conventionally used. The information recorded in the IC tag is read out by the reading means in accordance with a signal transmitted from the reader / writer. With this configuration, the present invention can be applied to a management object in which the IC tag auxiliary device of the present invention and the IC tag according to the conventional method are mixed, so that the scope of application of the present invention can be expanded.

(Embodiment 1)
FIG. 2 shows a configuration example of the IC tag auxiliary device 1 as Embodiment 1 according to the present invention. In FIG. 2, the second coil B <b> 6 is formed along the outer periphery of the substrate 8, and the second coil A <b> 5 is formed at an arbitrary position within the region surrounded by the second coil B <b> 6. In FIG. 2, it is arranged at the center position of the substrate 8, but is not limited to this position. The coil of the IC tag 2 (the first coil 4 in FIG. 1), that is, the first coil 4 is electromagnetically coupled to the second coil A5 on the IC tag auxiliary device 1 side inside the second coil A5. The IC tag 2 is installed. Further, as described in FIG. 1, the winding end (or winding start) of the second coil A5 and the winding start (or winding end) of the second coil B6 are directly connected, and the second coil A5 The winding start (or winding end) and the winding end (or winding start) of the second coil B 6 are connected via a capacitor 9.

  That is, the second coil A5 and the second coil B6 form one coil that is divided and wound, and therefore, both the coils are in the same winding direction, A tuning circuit having a resonance characteristic of a predetermined Q value is formed with a capacitor 9 connected at both ends. For this reason, this tuning circuit has a predetermined bandpass characteristic, passes only the frequency band of the data obtained from the IC tag 2, and other unnecessary signals or noise components are removed. In addition, although the base material 8 used in the above Embodiment 1 was demonstrated supposing the plate-shaped material, as a material of the base material 8, it does not specifically limit to a plate material, A flexible sheet form A material in which a coil is formed on this material can be used. Thereby, the application range of the IC tag auxiliary device 1 can be expanded.

  According to the configuration of the IC tag auxiliary device 1 according to the present invention, the third coil 7 shown in FIG. 1 serving as the pickup coil of the reader / writer 3 does not necessarily need to be close to the IC tag 2. Any position may be provided as long as it is within the region surrounded by the second coil B6 in FIG. 2, and the condition relating to the relative positional relationship between the reader / writer 3 and the IC tag 2 which has been a conventional problem is relaxed.

(Embodiment 2)
FIG. 3 shows a second embodiment according to the present invention. In general, in a coil having a plurality of turns, regardless of the shape such as a plane or a cylinder, the windings are densely wound, and the winding interval s shown in FIG. the increase as a coil A5, and the second coil B6 respective parasitic capacitance, the coil due to the parasitic capacitance self-resonance frequency f _pr is lowered, it will be close to the frequency f _r to be used in the IC tag 2, IC In some cases, the tag 2 may have a harmful effect on the operation.

Here, assuming that the parasitic capacitance is C _i , the radius is r assuming a circular antenna, and the number of turns of the antenna coil is n, the parasitic capacitance C _i is proportional to (n · r) / s and proportional. Assuming that the constant is K, it can be expressed by the following (Equation 1).

したがって、寄生容量に基づく共振周波数ｆ_ｐｒは、

Therefore, the resonance frequency f _pr based on the parasitic capacitance is

で与えられる。また、ＩＣタグ補助装置１において使用する信号周波数ｆ_ｒは、この信号周波数と同じ周波数に共振させるキャパシタ容量をＣとして

Given in. Furthermore, the signal frequency f _r to be used in the IC tag assisting apparatus 1, the capacitor capacitance to resonate at the same frequency as the signal frequency as C

で与えられる。ここでＬは第２のコイルＡ５およびＢ６の合成インダクタンスである。（数２）式で与えられる寄生容量による共振周波数ｆ_ｐｒは、（数３）式で与えられるＩＣタグ補助装置１において使用する信号周波数ｆ_ｒよりも十分に高ければよく、このためには寄生容量である線間容量を小さくすればよい。この線間容量を決定するパラメータとしては、第２のコイルＡおよびＢそれぞれの巻線の回数、基材となる材料の比誘電率、第２のコイルにおける２つのコイルの位置関係、巻線の線径、巻線材料の絶縁層厚さ、およびこの絶縁層の比誘電率等が挙げられる。このように設定要因が多いため一概に設定できないが、いずれにしても寄生容量の低減法としては、巻線外被である絶縁体の比誘電率を小さくするか、あるいは巻線間の間隔ｓを大にするかの方法がある。特に、調整容易な方法としては、巻線の間隔を広げて寄生容量Ｃ_ｉを低減し、この寄生容量Ｃ_ｉによる共振周波数ｆ_ｐｒがＩＣタグ２の信号周波数を含む同調周波数の帯域外で、かつ同調回路のＱ特性と信号伝送用に変調された変調信号に含まれるサイドバンド成分を考慮した周波数範囲よりも、十分に高く離れた周波数ｆ_ｈとなるように設定すればよい。この周波数ｆ_ｈとして、通常は上記信号周波数の３倍の周波数に選定すれば十分である。この場合のＩＣタグ補助装置１の概念図を図３に示す。ここで、図３においては、第２のコイルＡ５を円形に、第２のコイルＢ６を基材の外形に合わせて方形にしているが、コイルの形状によらず、共に方形、共に円形あるいは第２のコイルＡが方形で、第２のコイルＢが円形であっても差し支えないことは言うまでもない。

Given in. Here, L is a combined inductance of the second coils A5 and B6. The resonance frequency f _pr due to parasitic capacitance given by equation 2, the parasitic well, since this is if sufficiently higher than the signal frequency f _r to be used in the IC tag assisting apparatus 1 given by equation (3) What is necessary is just to make line capacity which is capacity small. Parameters for determining the line-to-line capacitance include the number of windings of each of the second coils A and B, the relative dielectric constant of the material serving as the base material, the positional relationship between the two coils in the second coil, Examples include the wire diameter, the insulating layer thickness of the winding material, and the relative dielectric constant of the insulating layer. Since there are many setting factors in this way, it cannot be set unconditionally, but in any case, as a method of reducing the parasitic capacitance, the relative permittivity of the insulator that is the winding jacket is reduced, or the interval s between the windings There is a way to make it bigger. In particular, as an easy adjustment method, the parasitic capacitance C _i is reduced by widening the winding interval, and the resonance frequency f _pr due to the parasitic capacitance C _i is outside the tuning frequency band including the signal frequency of the IC tag 2. In addition, the frequency f _h may be set sufficiently higher than the frequency range considering the Q characteristic of the tuning circuit and the sideband component included in the modulated signal modulated for signal transmission. As this frequency f _h , it is usually sufficient to select a frequency that is three times the signal frequency. A conceptual diagram of the IC tag auxiliary device 1 in this case is shown in FIG. Here, in FIG. 3, the second coil A5 is circular and the second coil B6 is square according to the outer shape of the substrate, but both are square, both circular or second, regardless of the shape of the coil. Needless to say, the second coil A may be square and the second coil B may be circular.

(Embodiment 3)
FIG. 4 shows another embodiment according to the present invention. FIG. 4 shows a cross-sectional view of the IC tag auxiliary device 1, in which the capacitor 9 in FIG. 1 is formed using the plate thickness of the substrate 8. That is, one end of the second coil A5 is connected to the first electrode 10 formed on the same plane as the second coil A5 and the second coil B via the conductive wire 14, and the first coil 10 is sandwiched between the first electrode 10 and the second coil A5. The second electrode 11 is formed on the opposite surface corresponding to the first electrode 10, and the second electrode 11 is connected to one end of the second coil B 6 through the lead 15 through the through hole 13 provided in the base material 8. It is connected. Thereby, the electrodes 10 and 11 constitute a capacitor 12.

  That is, in the third embodiment, since the thickness of the base material 8 is used as the tuning capacitor 9 in the IC tag auxiliary device 1, the step of externally attaching the capacitor in the manufacturing process becomes unnecessary, and the IC tag auxiliary device. 1 can be easily manufactured.

(Embodiment 4)
FIG. 5 shows a case where the IC tag auxiliary device 1 according to the present invention is applied when the object 20 to be checked for data of the IC tag 2 is an elongated rod-like object. In this case, the flexible sheet-like IC tag auxiliary device 1 described with reference to FIG. 2 can be used as it is wound, but as shown in FIG. Used to form the second coil A18 and the second coil B19 which are separately wound around the cylindrical base material 16. Here, by using the sheet-like IC tag 17 formed on a thin sheet-like base material, the sheet-like IC tag 17 can be directly attached to the data check object 20 or shown in FIG. As described above, the same effect can be obtained even if the cylindrical base material 16 is mounted on the inner position of the second coil A18. Although not shown here, it is assumed that the upper end portion of the second coil A18 and the lower end portion of the second coil B19 are connected via the capacitor 9.

  According to the fourth embodiment, the present invention can be applied to a case where an elongated cylindrical object such as a test tube is a data check management target, and is an effective means in medical relations, chemical product development, and the like. In this case, if a transparent or translucent material is used as the material of the cylindrical base material 16, the contents can be visually observed in the case of a data check target such as a test tube.

  As another example to which the fourth embodiment is applied, the second coils A and B are formed in a rod-shaped bobbin instead of a cylindrical shape, and the IC tag 2 can be installed on an end surface portion or a curved surface portion of the bobbin. In this case, the IC tag 2 is not particularly limited to a base material made of a flexible material. In the fourth embodiment described above, a cylindrical base material is assumed. However, even if this is a base material having a polygonal cross section, the same effect can be obtained.

  Such a long and narrow bar-shaped IC tag auxiliary device 1 may be installed, for example, at an arbitrary corner in a transport container. This configuration also alleviates the problem of restriction on the relative positional relationship between the reader / writer 3 and the IC tag 2.

The block diagram of the RFID system using the IC tag auxiliary | assistance apparatus by this invention. The plane sketch of the IC tag auxiliary | assistance apparatus by Embodiment 1 of this invention using the planar antenna comprised on the sheet-like base material. The plane sketch of the IC tag auxiliary | assistance apparatus by Embodiment 2. FIG. Sectional drawing of the IC tag auxiliary | assistance apparatus by Embodiment 3. FIG. FIG. 6 is an external view of an IC tag auxiliary device according to a fourth embodiment.

Explanation of symbols

1: IC tag auxiliary device 2: IC tag 3: reader / writer 4: first coil 5: second coil A 6: second coil B
7: Third coil 8: Base material 9: Capacitor 10, 11: Electrode 12: Capacitor 13: Through hole 14 :, 15: Conductor 16: Cylindrical base material 17: Sheet-like IC tag 18: Second coil A
19: Second coil B 20: Data check target

Claims (8)

An IC tag auxiliary device having a second coil that is electromagnetically coupled at the same frequency as a first coil of an IC tag and a third coil of a reader / writer,
The second coil is divided into a second coil A and a second coil B that are connected in series with the same winding direction in order to couple with the first coil and the third coil, respectively. The second coil B is wound and is larger in size than the second coil A, and the second coil A is in a predetermined position inside the second coil B on the insulating flat plate base material. Formed,
One end of the winding end of the second coil A that is not connected to the second coil B and one end of the winding end of the second coil B that is not connected to the second coil A Are connected via a capacitor, and the capacitance of the capacitor is set so as to be tuned at the same frequency as the electromagnetic coupling frequency with respect to the second coil, thereby forming a band-pass filter. IC tag auxiliary device characterized by the above. In the IC tag auxiliary device according to claim 1,
An IC tag auxiliary device using a flexible sheet-like material as the insulating flat substrate. In the IC tag auxiliary device according to claim 1 or 2,
The self-resonant frequency of the coil additionally generated by the line capacitance of the windings of at least one of the second coils A and B is at least three times higher than the tuning frequency used in the second coil. An IC tag auxiliary device characterized in that the inter-winding capacitance is set as described above. In the IC tag auxiliary device according to any one of claims 1 to 3,
A first electrode is provided on the surface of the insulating flat plate base on which the second coils A and B are formed, and faces the first electrode on a surface opposite to the surface of the second coils A and B. A second electrode is installed at a position; the first electrode is connected to one end of the second coil A and B that is not a connection end by a conductive wire; and the second electrode is connected to the insulating plate base The capacitor is formed by penetrating a conductive wire to the coil surface side of the insulating plate base material through a through hole provided in the material and connecting to the other end of the second coil A and B that is not the connection end. An IC tag auxiliary device characterized by being formed. An IC tag auxiliary device having a second coil that is electromagnetically coupled at the same frequency as a first coil of an IC tag and a third coil of a reader / writer,
In order to couple the second coil to the first coil and the third coil, respectively, the second coil is divided and wound into the second coil A and the second coil B having the same winding direction, and the second coil The coil A and the second coil B are formed around one cylindrical insulating substrate,
The IC tag is installed at a position where the second coil A is wound on the cylindrical insulating substrate,
One end of the winding end of the second coil A that is not connected to the second coil B and one end of the winding end of the second coil B that is not connected to the second coil A Is connected via a capacitor, and the capacitance of the capacitor is set to tune at the same frequency as the electromagnetically coupled frequency with respect to the second coil, thereby forming a band-pass filter. An IC tag auxiliary device characterized by comprising: In the IC tag auxiliary device according to claim 5,
Instead of the cylindrical insulating substrate, a rod-shaped insulating substrate is used,
The IC tag auxiliary device, wherein the IC tag is installed on an end surface portion of the rod-shaped substrate or on the inner surface of the second coil A and on the surface of the rod-shaped substrate. Using the IC tag auxiliary device according to any one of claims 1 to 6,
The IC tag is installed in the vicinity of the second coil A,
Bring the reader / writer 3 close to the second coil B,
A signal of a predetermined frequency is transmitted from the reader / writer side, and the transmission signal is received by the IC tag auxiliary device and simultaneously transmitted to the IC tag by electromagnetic coupling.
Read the information recorded in the IC tag by the transmitted signal,
A method of using an IC tag auxiliary device, wherein the information of the read IC tag is received and output by the reader / writer via the IC tag auxiliary device. A method of using an IC tag auxiliary device for reading data of a management object using the IC tag auxiliary device according to any one of claims 1 to 6,
A signal having a predetermined frequency is received from the reader / writer side in a state where a management object to which the IC tag is attached with the IC tag auxiliary device interposed and a management object to which the IC tag is attached by a conventional method are mixed. The management object that is transmitted and the IC tag is attached via the IC tag auxiliary device is passed through the IC tag auxiliary device, and the management object that is attached the IC tag by a conventional method is changed from the IC tag to the conventional one. A method for using an IC tag auxiliary device, characterized in that information recorded on the IC tag is read out by a method using a signal transmitted from the reader / writer.

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