JP5260031B2 - Wireless transmission / reception device, non-contact information recording medium, information reading / writing device, and management system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a radio transmitter-receiver which is free from a shift of a resonant frequency and the reduction in communication sensitivity even with non-contact information recording media interposed between or placed on metal surfaces and is available even in the case of overlap or proximity between non-contact information recording media, a non-contact information recording medium, an information reader/writer, and a management system. <P>SOLUTION: The radio transmitter-receiver includes: a coil 2 incorporating a magnetic material plate 6; and two metal plates 11a and 11b which are disposed in parallel with a direction of a magnetic flux of the coil 2 and in opposition to each other on both sides of the coil 2. <P>COPYRIGHT: (C)2009,JPO&amp;INPIT

Description

  The present invention relates to a wireless transmission / reception device, a non-contact information recording medium, an information reading / writing device, and a management system. More specifically, the present invention relates to a contactless IC card or RFID tag, a reader / writer that transmits / receives information to / from them, and a management system using them for the purpose of transmitting / receiving information by an antenna coil.

  Non-contact IC (Integrated Circuit) cards and RFID (Radio Frequency IDentification) tags perform short-distance communication (neighbor communication) by electromagnetic coupling of coils, and are generally papers in which an IC is bonded to a planar coil wound in a radial direction. Bases or plastic bases are used (hereinafter referred to as paper tags or plastic tags).

  Some of these non-contact type IC cards or RFID tags have a metal-compatible tag using a metal sheet made of a mixture of a thin magnetic material and rubber on one side of the paper tag or a plastic tag. However, it is significantly affected by the metal surface and communication sensitivity is poor. Also, the patent application filed by the inventor of the present application or for this application (see, for example, Patent Document 1 to Patent Document 4) also uses a metal surface, but other metal surfaces are added. As a result, the capacitance between the coils increases, and the resonance frequency shifts to a higher frequency near 0.5 MHz to 1 MHz. In addition, when metal surfaces are positioned above and below the non-contact IC card or RFID tag, only one surface of the non-contact IC card or RFID tag is hit by the metal plate, so a larger resonance frequency shift occurs on the other surface. To do. This is because the coil surface is exposed on the remaining three surfaces where there is no metal plate of a non-contact type IC card or RFID tag. As described above, in the conventional example, the metal handling is not complete, although the metal handling is not perfect.

  Also, when this metal-compatible non-contact IC card or RFID tag approaches each other, both coils face each other, causing mutual coupling (so-called mutual coupling) between the coils, which also has a resonance frequency. The communication distance is significantly reduced by shifting (generally shifting to a lower frequency). Even if the IC chip has an anti-collision (anti-collision) function or anti-crash (anti-crash) function, the analog mutual interference reduces the communication function, and the data in the IC chip Cannot be identified.

  In addition, even if an attempt is made to write to the RFID tag due to mutual coupling between the coils, the sensitivity is reduced and the coil cannot be separated and cannot be written. That is, the use environment is also limited in such special magnetic tags that are compatible with metals.

  Also, some non-contact IC cards and RFID tags use coils so that a flat magnetic body is wound around a card-like thin magnetic body, but the coil cross section is small and no metal plate is used. The sensitivity is very low because the magnetic field spreads. Since the resonance frequency is shifted again on the metal surface, the sensitivity is further lowered. Moreover, general paper tags and plastic tags cannot be used on metal surfaces, and metal-type tags with a thin magnetic sheet attached are also insensitive, and can be used when there is a metal surface on one side or both sides. become unable. In addition, when the RFID tags are attached to a thin object or the like, when the RFID tags are overlapped with each other, the mutual coupling for the coil surfaces to face each other becomes very large, so that the resonance frequency is greatly shifted. When the RFID tags come close to each other, the self-inductance L and the mutual inductance M are almost equal (nearly equal) L≈M, so that no voltage is generated by the inductance, and the resonance frequency is Since the current is shifted, almost no current flows, so that the IC cannot be excited to extract a signal. In this situation, even if the IC itself has an anti-collision function or an anti-crash function, the function as an RFID tag cannot be obtained before these functions are exhibited. For example, when an RFID tag is used for a thin book, thin file, CD, etc., when a large number of thin books, thin files, CDs, etc. are closely arranged, the ID held in the RFID tag cannot be acquired. Is the current situation.

Furthermore, when managing personal computers (PCs), communication devices, metal objects, etc., RFID tags are often sandwiched between metal surfaces, and there are no RFID tags that can be used in such cases. Further, when the coil is used as an antenna, the radiation resistance is small, and when it is used on a metal surface, it is further restricted.
Japanese Patent No. 3362607 JP 2003-317052 A JP-A-2005-192124 Japanese Patent Application No. 2006-314156

  Even if the coil of the non-contact type IC card or RFID tag is a square type or flat type solenoid type coil that is easy to adhere to metal, it is affected by the metal surface and the stray capacitance between the wires constituting the coil is metal. It increases through the surface, the apparent inductance decreases, the resonance characteristics shift, and the characteristics are greatly affected. In addition, the image current effect of the metal surface doubles the coil current and the magnetic flux generated by it, and the magnetic flux density increases several times due to the concentration of the magnetic flux due to the multiple image effect (Multi-Image Effect). This increases the sensitivity and increases the sensitivity several times. However, in the conventional example, since the accompanying metal plate is one surface or limited, the increase in the metal surface makes it easy to be adversely affected by the metal surface. .

  Furthermore, if a metal body or a metal surface exists on both sides of the non-contact type IC card or RFID tag, the influence from this is added. On the side of the non-contact type IC card or RFID tag that does not have a metal plate (or metal film), the stray capacitance between the coil wires increases significantly due to the metal surface, and the displacement current increases, and the coil leaks significantly. As a result, the apparent inductance is reduced, the resonance frequency is greatly shifted, the characteristics are deteriorated, and the sensitivity is lowered.

  In addition, when the RFID tags are overlapped with each other, the metal correspondence tag having three open faces has a large coupling coefficient between the coils and generates mutual interference.

  In an environment where a large number of RFID tags are actually used, various influences such as interference between RFID tags, the influence of the metal surface, and the situation of being sandwiched from the metal surface occur. It is desirable to have an RFID tag that can be used even when such various bad conditions and environments occur.

  An object of the present invention is to provide a universal smart tag (or an optimal smart tag) that can be used without deteriorating characteristics even in the above-mentioned adverse conditions and various environments. Needless to say, the present invention can be applied not only as a tag but also as a sensor. Moreover, it can also be used as a radiation antenna by increasing the radiation resistance by making the coil a little larger and increasing the number of turns.

  In addition, the sensitization function of thin coils using the multiple image (multi-mirror) method is used, and even when the RFID tag is sandwiched or placed between metal surfaces and surrounding metal bodies, the resonance frequency is shifted and communication is possible. Ideal for use without worrying under any conditions, not only when the RFID tag and non-contact IC cards overlap or approach each other or when a metal surface is further added To provide a universal smart tag system, that is, an optimum smart tag system.

  That is, the present invention has been made paying attention to the points described above, and even when a non-contact information recording medium is sandwiched or placed on a metal surface, the resonance frequency shifts and the communication sensitivity decreases. It is an object of the present invention to provide a wireless transmission / reception device, a non-contact information recording medium, an information reading / writing device, and a management system that can be used even when non-contact information recording media overlap or approach each other.

  In order to achieve the object of the present invention, the following configuration is provided.

[1] A magnetic core-containing coil, and a plurality of conductive plates or conductive films arranged on the upper and lower surfaces along the magnetic core-containing coil in parallel with the direction of magnetic flux of the magnetic core-containing coil , The wireless transmission / reception apparatus , wherein the magnetic flux is converged in a space between the plurality of conductive plates or conductive films by a multiple image effect by the plurality of conductive plates or conductive films .
[2] The magnetic core includes a radio transceiver device according to claim 1, characterized in that the magnetic material thin plate shape.
[3] In the wireless transmission / reception device according to [1], the magnetic core is formed by firing a green sheet or a magnetic material and attaching a plastic sheet to one or both surfaces of the magnetic core so as to have flexibility. A wireless transmission / reception device formed.
[4] The wireless transmission / reception device according to [1], wherein the magnetic core is formed by mixing rubber or plastic and powdered magnetic material so as to have flexibility. .
[5] In the wireless transmitting / receiving device according to [1], the magnetic core is formed of a thin magnetic film having a high magnetic permeability, and is formed of a laminated structure insulated by an oxide film, a coating, or a plastic film. A wireless transmission / reception device.
[6] The wireless transmission / reception device according to [4] or [5], wherein one of the plurality of conductive plates or the conductive film is longer than the others.
[7] In the wireless transmission / reception device according to any one of [1] to [5], the plurality of conductive plates or conductive films are formed using an aluminum plate, metal foil, metal coating, metal vapor deposition, or metal ink. A wireless transmission / reception device.
[8] The wireless transmission / reception device according to any one of [1] to [5], wherein at least one of the plurality of conductive plates or conductive films uses a flexible substrate. Wireless transceiver equipment.
[9] In the wireless transmission / reception device according to any one of [1] to [5], the plurality of conductive plates or conductive films uses a film in which a metal foil is laminated on a plastic film. Transmission / reception equipment.
[10] In the wireless transmission / reception device according to any one of [1] to [9], the plurality of conductive plates or conductive films are surfaces of the magnetic core inserted between the plurality of conductive plates or conductive films. A wireless transmitter / receiver characterized by having a larger area than
[11] In the radio transmitting and receiving device according to the above [10], gap between the plurality of conductive plates or conductive film, the insulating material, the space is the magnetic core coil with a dielectric or a portion magnetic absent filled A wireless transmission / reception device.
[12] The wireless transmission / reception device according to any one of [1] to [11], wherein the plurality of conductive plates or conductive films are partially continuous.
[13] The wireless transmission / reception device according to any one of [1] to [12], wherein the wireless transmission / reception device is used not only as an electromagnetic coupling sensor but also as a radio wave transmission / reception antenna, or for electromagnetic coupling and radio waves. A wireless transmission / reception device characterized by being used for both transmission / reception antennas.
[14] The wireless transmission / reception device according to any one of [1] to [13], and an IC chip connected to the coil, and transmission / reception of information to / from the information reading / writing device via the wireless transmission / reception device A non-contact information recording medium characterized by:
[15] In the non-contact information recording medium according to [14], the coil is formed by winding a plastic sheet on which a metal wire is disposed by etching or printing around the magnetic core, and the IC chip is A non-coil is connected to one end of the coil and the other end of the coil disposed from a surface opposite to the surface of the plastic sheet on which the metal wire is disposed. Contact information recording medium.
[16] The conductive plate or conductive film that includes the wireless transmission / reception device according to [6] and an IC chip connected to the coil, and is longer than the other of the plurality of conductive plates or conductive films. Is a non-contact information recording medium formed by bending the conductive plate or the conductive film so that both ends can be secured.
[17] The non-contact information recording medium according to [14] or [15], wherein the wireless transmission / reception device and the IC chip are mounted on a SIM, SD card, mini SD card, or USB stick. Contact information recording medium.
[18] The non-contact information recording medium according to [17], wherein the SIM, the SD card, the mini SD card, or the USB stick has a short-range communication function.
[19] The non-contact information recording medium according to any one of [14] to [18], wherein the IC chip has a dual function of a contact type and a non-contact type. Medium.
[20] An information read / write comprising the wireless transmission / reception device according to any one of [1] to [13], wherein information is transmitted to and received from a non-contact information recording medium via the wireless transmission / reception device. apparatus.
[21] The non-contact information recording medium according to any one of [14] to [19], the information reading / writing device according to claim 20, and the non-contact information read by the information reading / writing device. An information processing apparatus for processing information on a recording medium;
A management system comprising:

  That is, the technical contents of the present invention can solve the above-described problems by including the following configuration.

  (1) A wireless transmission / reception comprising a magnetic core-containing coil and a plurality of conductive plates or conductive films arranged along the magnetic core-containing coil in parallel with the direction of magnetic flux of the magnetic core-containing coil. machine.

  (2) The wireless transmission / reception device according to (1) and an IC chip connected to the coil, wherein information is transmitted / received to / from the information reading / writing device via the wireless transmission / reception device. Contact information recording medium.

  (3) An information reading / writing apparatus comprising the wireless transmission / reception device according to (1), wherein information is transmitted to and received from a non-contact information recording medium via the wireless transmission / reception device.

  (4) The non-contact information recording medium according to (2), the information reading / writing device according to (3), and the information of the non-contact information recording medium read by the information reading / writing device are processed. A management system comprising: an information processing apparatus that performs the processing.

  According to the present invention, even in an environment where the sensitivity deteriorates due to the presence of a metal surface or the proximity of an RFID tag, a thin tag, module or card using the multiple image method of the present invention is based on the multiple image method. The technology that increases sensitivity makes it possible to read information held by tags, modules, and cards, and enables management and organization of all sorts of items such as thin books, files, and metal surface plastics.

  That is, even in an environment where the sensitivity deteriorates due to the presence of metal surfaces or contactless information recording media, the contactless information recording medium or information including the wireless transmission / reception device using the multiple image method of the present invention. The read / write device can read the information held in the non-contact information recording medium by the technology for increasing the sensitivity by the multiple image method, and can manage and organize everything such as thin books, files, metal surface plastics, etc. Become.

  Further, according to the present invention, it can be used not only as an RFID sensor, tag, NFC sensor but also as an antenna for wireless communication, and can be mounted as a sensor or antenna for a mobile phone, a PC (personal computer) or the like. it can.

  The best mode for carrying out the present invention will be described below based on examples.

  A specific example of a multiple image system of an RFID tag for a metal surface or a non-contact IC card using a coil antenna and IC (Integrated Circuit) according to the present invention will be described with reference to the drawings.

  FIG. 1 is a diagram showing an example of a universal smart tag (non-contact information recording medium) that is an RFID tag using a coil antenna (wireless transmission / reception device) of the present invention. 1A is a cross-sectional view of the universal smart tag when the width of the metal plate and the magnetic body is substantially the same, and FIG. 1B is a cross-sectional view of the universal smart tag when the metal plate is larger than the width of the magnetic body. is there. 1 (c) is a view of FIG. 1 (a) viewed from above, and FIG. 1 (d) is a view of FIG. 1 (b) viewed from above, both of which are a metal surface 21a and a metal plate 11a. Not shown.

In Figure 1, a thin magnetic plate 6 (core) is wound a coil 2 which is an insulating coating, so as to sandwich the upper and lower, of the metal plate 11a thickness t ₁ (conductive plate) and the metal plate having a thickness t ₂ 11b (conductive plate) is applied. That is, the metal plates 11a and 11b are disposed so as to be parallel to the direction of the magnetic flux of the magnetic plate 6 and to face each other. The metal plate may be a metal film (conductive film). The width of the metal plate is x. 2 is a coil having a thickness 2ρ wound around the magnetic plate 6 (width x ₆ , thickness T), and since this value is small, the width x ₆ and the width x of the magnetic plate 6 are almost the same width. It has become. Furthermore, the metal surface 21a and the metal surface 21b are installed so as to sandwich the RFID tag body (thickness 4ρ + T) to which the metal plate 11a and the metal plate 11b are applied vertically. The metal surfaces 21a and 21b may be metal bodies. Insulated spaces S are formed on the left and right sides of the RFID tag main body. Generally, it is a space insulated by air, plastic, paper, magnetic material, etc.

  Here, the metal plate 11a and the metal plate 11b increase or change the stray capacitance between the electric wires constituting the coil 2 and the stray capacitance between the metal surface approaching the coil 2 when the metal approaches the RFID tag. It is also a metal plate for the purpose of restraining. Furthermore, it is a metal plate for the purpose of allowing the magnetic field H to be concentrated in the left and right space S sandwiched between the metal plate and the metal surface so that the magnetic field H does not spread vertically. The metal plate may be either hard or flexible. It can be selected according to the purpose.

In the case of FIG. 1 (a), since the width of the metal plates 11a and 11b is relatively small, it is much better than the effect of only the lower metal plate (the case where there is no metal plate 11a and only the metal plate 11b). It ’s not enough. That is, although there is a certain effect in suppressing the change in stray capacitance and the spreading of the magnetic field, the portions where the magnetic flux is suppressed in the space S as shown in FIG. 1C are the upper and lower metal surfaces 21a and 21b. Therefore, when the RFID tag body is sandwiched between the metal surfaces 21a and 21b, the resonance frequency still changes due to changes in inductance and capacitance. Moreover, the multiple image effect by the metal plates 11a and 11b is not perfect because the metal surfaces of the metal plates 11a and 11b are too small. The thickness (4ρ + T) of the RFID tag main body is about 0.5 to 1.5 mm, the thickness (T) of the magnetic plate 6 is 0.1 to 2 mm, the thickness 2ρ of the coil is 0.08 to 0.1 mm, a metal plate The thickness (t ₁ or t ₂ ) of 11a and 11b can be made extremely thin with 0.1 mm or less. In order to resonate with the IC (IC chip) 3 included in the RFID tag, the coil 2 adjusts the inductance by winding 20 turns. It is necessary to increase the number of turns of the coil in order to apply the metal film vertically.

  In the case of FIG. 1B, as can be seen from the drawing, the width (x) of the metal plates 11a and 11b is sufficiently large, so that the coil 2 is formed even if the metal surfaces 21a and 21b appear up and down. The stray capacitance between the electric wires, the distribution of magnetic flux and the change of magnetic flux density can be almost eliminated. In addition, since the magnetic field is confined between the upper and lower metal plates 11a and 11b, mutual coupling can be weakened even if another RFID tag is brought closer to the upper and lower sides. This is the shielding effect by the metal plates 11a and 11b, which is another advantage of the present invention. FIG. 1C is a top view of FIG. 1A (when the width of the metal plates 11a and 11b is approximately the same as the width of the RFID tag main body). The current I flows through the coil 2 and the magnetic field H ( A dotted arrow indicates the direction of magnetic field lines), and OW in the figure indicates an opening in front of the RFID tag. The same applies to the OW in FIG.

  In the case of FIG. 1B, compared with the case of FIG. 1A, the magnetic flux is almost within the range of the metal plates 11a and 11b in both the lateral view (FIG. 1B) and the top view (FIG. 1D). You can see that it is in. Both ends of the space S are open and insulated (OP in FIG. 1B indicates an open part (insulating part)), and has a finite width, and magnetic flux is compressed with metal up and down. The magnetic flux will spread somewhat.

  As can be seen from FIG. 1D, the larger the width of the metal plates 11a and 11b, the larger the side of the RFID tag (the surface of the surface where the metal plates 11a and 11b are not in contact with the coil 2 in FIG. 1B). On the other hand, the amount of the magnetic field (left and right in the drawing) that protrudes from the metal plates 11a and 11b becomes smaller and stable. However, since there is a case where it is desired to pick up not only the strong magnetic field in the front (the direction in which the magnetic field H faces in FIG. 1 (c), the rear where the IC 3 is disposed) but also the side magnetic field. , The size of the metal plates 11a and 11b, and the position where the RFID tag is attached to the metal surface can be appropriately selected in relation to the sensor (reader / writer sensor). Lamination of magnetic plate 6 having a thickness (T) of 0.1 to 2 mm, winding thickness (ρ) of coil 2 of 0.08 to 0.1 mm, and metal plates 11a and 11b having a thickness of 0.1 mm or less. By using a metal foil, the thickness can be reduced to 0.1 mm or less, and the entire RFID tag can be configured to have a thickness of about 0.3 to 2 mm, or a non-contact IC card thickness of 0.8 mm. Any metal material may be used as long as it has metal properties such as aluminum, iron, copper, silver, and gold and has a low loss.

  In this embodiment, when the number of turns of the coil 2 is 20 or more turns, resonance with the IC 3 is taken, and a strong magnetic field is created in the front. The side space S is generally filled with an insulator such as plastic or paper. However, the width and length of the metal plates 11a and 11b can be reduced by using a magnetic material as a part and suppressing the spread of the magnetic field. .

  FIG. 2 compares the effects of the case where the metal surface is on the upper and lower surfaces and the surface on only one of the upper and lower surfaces in the case of the multiple image (multi-mirror) method of the present invention and the case where the conventional image of only one surface is used. It is a figure explaining.

FIG. 2A shows a case where the metal plates 11a and 11b are provided above and below the magnetic plate 6 and the metal surfaces 21a and 21b exist above and below. That is, as shown in FIG. 1B, the surrounding metal surfaces 21a and 21b exist above and below the RFID tag, and the upper and lower metal plates 11a and 11b for the multiple image (multi-mirror) system of the present invention are provided. The case where it is made not to be influenced by the surrounding metal surfaces 21a and 21b is shown. The number of turns of the coil 2 is about 24, and the magnetic plate 6 has a thickness (T) of 0.1 mm to 2 mm, a width (x ₆ ) of 1.5 mm to 40 mm, and a length of about 5 mm to 40 mm. The thickness (t ₁ , t ₂ ) of the metal plates 11a and 11b is 0.1 mm or less, the width is _{2 to} 60 mm, and the length is about 5 to 60 mm according to the length of the magnetic plate 6. Yes. S is an insulated space.

  FIG. 2B is a diagram showing a case where only the metal surface 21 b exists when the metal plates 11 a and 11 b are provided above and below the magnetic material plate 6. That is, it is a diagram showing a case where the metal surface 21b exists only in the lower part. In this case as well, the sensitivity is increased by the effect of the multiple image system of the present invention by the upper and lower metal plates 11a and 11b, and the lower metal surface It shows that the influence of 21b is shielded by the upper and lower metal plates 11a and 11b and is hardly affected.

  As shown in FIG. 1 for both FIG. 2 (a) and FIG. 2 (b), the thickness of the RFID tag or non-contact IC card can be set to about 0.5 to 1 mm. There is no problem at all if it is made thicker.

  FIG. 2 (c) is a diagram showing a case where the conventional metal plate 11b is used, and is a diagram showing a case where the metal surfaces 21a and 21b are present on the upper and lower sides with the configuration of only the metal plate 11b. In this case, both the inductance and the capacitance are greatly affected by the metal surfaces 21a and 21b existing above and below, particularly from the upper metal surface 21a. In addition, the stray capacitance of the side coil also increases and the characteristics as a whole deteriorate greatly.

  FIG. 2D is a diagram showing a case where only one metal surface 21b is considered in correspondence with the conventional metal plate 11b, and the metal plate 11b has only the width of the RFID tag. In this case, even if there is no metal surface at the top, the inductance and stray capacitance change, and even if the metal plate 11b is attached, the resonance characteristics shift near 1 MHz when the metal surface 21b is present or not, and the characteristics deteriorate. To do. In this case, the inductance is reduced by applying the metal plate 11b, and the number of turns of the coil 2 is 10 turns or more in order to resonate with the IC 3.

  Next, this reason will be explained in a little more detail.

  FIG. 3 is a transparent perspective view drawn so that the coil 2 of the RFID tag can be seen. The metal plates 11a and 11b are vertically located, and the metal surfaces 21a and 21b are sandwiched from both sides (above and below the metal plates 11a and 11b) so as to surround the RFID tag. The metal plates 11a and 11b and the metal surfaces 21a and 21b may be in contact or separated from each other.

  The capacity between metals when the metal plate 11a and the metal surface 21a (or the metal plate 11b and the metal surface 21b) are separated is defined as CPM. When the metal plate 11a and the metal surface 21a (or the metal plate 11b and the metal surface 21b) are in contact with each other, the capacitance CPM becomes infinite ∞ and is short-circuited. That is, the potentials of the metal plate 11a and the metal surface 21a (or the metal plate 11b and the metal plate 21b) are the same.

  Since the upper and lower metal surfaces 21a and 21b are insulated, the capacitance between them is Cv, and the potential difference between them is V. If the upper and lower metal plates 11a and 11b are not in contact with the metal surfaces 21a and 21b, a potential difference is generated due to the electromotive force of the coil 2, and the potential difference V is different from the potential difference V between the metal surfaces 21a and 21b.

  The magnetic plate 6 inserted into the coil 2 is not illustrated because the drawing becomes complicated and the coil 2 becomes invisible, but in the actual case, a magnetic material is used to obtain a strong magnetic flux density. . Even when the magnetic plate 6 is not provided, the multiple image effect is generated, but when the magnetic plate 6 is omitted, the magnetic flux density is reduced accordingly. Both ends of the IC 3 of the RFID tag and the coil 2 are connected (see, for example, FIG. 1C), and the number of turns is adjusted so as to resonate with the capacitance of the IC 3 around 20 pF and the inductance of the coil 2 due to the multiple image effect. The resonance frequency may be adjusted by adding a chip capacitor. On the other hand, in the case of a frequency band such as UHF higher than 13.56 MHz, it is difficult to obtain a material with a high relative permeability and the loss increases. Therefore, when selecting a magnetic material with a high magnetic permeability and a low loss or omitting the magnetic material There is also.

  Actually, by winding a coil of 20 or more turns, an inductance close to 6 μH is obtained, and a resonance frequency close to the operating frequency of 13.56 MHz is obtained.

  The capacity between the coil 2 and the metal plate 11b is Cs, and the capacity between the coil 2 and the metal surface 21b is Cg. Although not shown, stray capacitance Cs also exists between the coil 2 and the metal plate 11a, and stray capacitance Cg also exists between the coil 2 and the metal surface 21a. Let Cw be the stray capacitance between the electric wire 2-1 and the electric wire 2-2 constituting the coil 2 and between the electric wire 2-2 and the electric wire 2-3. Since there are the metal plates 11a and 11b in the longitudinal direction of the coil 2, the stray capacitance Cs between the coil 2 and the metal plates 11a and 11b is relatively large. Moreover, there exists a coupling | bonding with the side part of the coil 2, and it increases, so that the width | variety of the metal plates 11a and 11b becomes large.

  On the other hand, the stray capacitance Cg between the side portion of the coil 2 and the metal surfaces 21a and 21b is reduced as the length of the coil 2 on the side portion is short and the length of the metal plates 11a and 11b is increased. The bond is weak and therefore less susceptible to external influences.

  One of the techniques of the present invention is also in view of how to reduce the stray capacitance Cg by the metal plates 11a and 11b to obtain stable resonance characteristics, shielding characteristics, and inductance characteristics.

  The stray capacitance Cw between the electric wires 2-1, 2-2, 2-3, etc. constituting the coil 2 increases the stray capacitance Cs between the coil 2 and the metal plates 11 a and 11 b as the metal plates 11 a and 11 b. The displacement current due to the stray capacitance Cs increases, and the inductance decreases compared to the case where there is no metal plate 11a, 11b. In other words, the stray capacitance increases considerably through the metal plates 11a and 11b as a whole.

As described above, the presence of the metal plates 11a and 11b not only concentrates the magnetic flux in the gap and increases the magnetic flux density, but also encapsulates the generation of unstable stray capacitance that causes the resonance frequency to be shifted in the RFID tag. There is a function. Thereby, since the distribution of the magnetic field described below is concentrated between the metal plates and greatly different, it is possible to remove the adverse influence caused by coupling to another RFID tag or the like. For multi-imaging method, the cross-sectional area of the coil 2 in length, relative magnetic permeability mu _r and the physical length of the magnetic plate 6, varies depending on the size or the like, 20 to 30 turns turns of the coil 2 is 13.56MHz Therefore, the number of turns is relatively increased to about 6 μH in accordance with the chip capacity of about 22 pF.

  FIG. 3 (b) is shown for comparison. In the case where there is only one conventional metal plate 11b, there is no metal plate at the top, so that when the metal surface 21a approaches, the stray capacitance between the coil 2 and the metal surface 21a. Cg significantly increases and the resonance frequency of the RFID tag is greatly shifted.

  Further, since the width of the metal plate 11b is small, the lower metal surface 21b and the coil 2 are easily coupled and the stray capacitance Cg is increased, so that the influence of the metal surface 21b is inevitable.

  FIG. 4 shows the state of the magnetic field when the coil 2 is wound around a flat magnetic material or a rectangular magnetic material that is thin in the vertical direction corresponding to the magnetic material plate 6. For simplicity, a part of the coil 2 is not shown. As shown in FIG. 4, the magnetic field mainly spreads up and down due to the current I (Hd, Hu in the figure) and is distributed in the upper and lower spaces along the width of the coil 2. Since the length is short, there is only a slight magnetic field on the left and right (Hs in the figure). In this case, the number of turns of the coil 2 also varies depending on the length and cross-sectional area of the coil 2, the magnetic permeability and length of the magnetic plate 6, etc. The number of turns of the coil 2 is several turns at 13.56 MHz, the inductance is about 6 μH, IC Since the capacity of 3 is 20-22 pF, it resonates well.

  Since the magnetic field generated by the coil 2 is widely distributed up and down, if this is overlapped, naturally the electromagnetic coupling is large, and if the general RFID tag is overlapped so as to be coupled, interference occurs and it cannot be used as it is.

  However, unlike a general RFID tag, it is not coupled in the axial direction of the coil 2 (broken arrow in the figure), so the lateral coupling is about half of the coupling in the axial direction (1/2 or 2 in terms of magnetic field strength). In the case of this coil, 1/4). Nevertheless, mutual interference occurs, so that it is difficult to read the data of the RFID tag with a reader, and when writing, it is impossible to write to the RFID tag even if the sensor of the reader is individually associated. Moreover, since the cross section of the coil is small and the magnetic field is not concentrated, the sensitivity is low.

  This is the difference between the conventional smart tag and the universal smart tag based on the multiple image method (multi-mirror effect) of the present invention and a general RFID tag or non-contact IC card, which will be described in detail below.

  FIG. 5 explains how to prevent the influence of the external metal surfaces 21a and 21b by devising the size and shape of the metal plates 11a and 11b. FIG. 5 is a cross-sectional view of a universal smart tag or sensor, which is an RFID tag of the present invention, as seen from the front (front).

  FIG. 5A is a diagram showing a case where the metal plate and the metal surface are arranged with a certain distance. That is, in FIG. 5A, a certain distance is provided between the metal plates 11a and 11b and the metal surfaces 21a and 21b, and when the metal plates 11a and 11b and the metal surfaces 21a and 21b are very close to each other, If the stray capacitance CPM becomes very large and comes into contact, CPM = ∞, that is, a short circuit occurs. Therefore, by providing an insulator Ins or a dielectric such as plastic or via a magnetic material, the metal surface 21a , 21b shows an example in which the influence is reduced. If the magnetic material is made too thick, the magnetic field can easily escape, and the shielding effect is somewhat reduced.

  FIG. 5B illustrates the case of FIG. 1A. Since the width of the metal plates 11a and 11b is narrow and the distance between the metal surfaces 21a and 21b is narrow, the metal surfaces 21a and 21b and the coil 2 are This indicates that there are quite a few stray capacitances Cg. Since the stray capacitance CPM in the metal plates 11a, 11b and the metal surfaces 21a, 21b are in contact with each other, CPM = ∞ and short-circuited, and the metal plates 11a, 11b become part of the metal surfaces 21a, 21b. ing.

  There is a potential difference (V) between the upper and lower metals, and this is the path for the magnetic field. This is the simplest configuration.

  FIG. 5 (c) shows the case where the metal plates 11a and 11b are located above and below the coil 2 and the metal surface 21b is located only below, and the multiple image effect is considerably obtained by the upper and lower metal plates 11a and 11b. 1, the width of the metal plates 11 a and 11 b is not large (similar to that of the magnetic plate 6). Therefore, the floating capacitance Cg between the coil 2 and the coil 2 is slightly affected by the coupling from the metal surface 21 b. There is an outbreak.

  Although stray capacitance CPg of the upper metal plate 11a, the lower metal plate 11b, and the metal surface 21b is also generated, the influence is small because the coil 2 is not directly as shown in FIG. 2 (d) and FIG. 3 (b). This is the effect of providing the upper metal plate 11a.

  As in the case of FIG. 5A, the stray capacitance CPM between the metal plate 11b and the metal surface 21b is small because the insulator Ins and the magnetic material are interposed, and the influence can be reduced. Of course, the insulator Ins or the magnetic material may be omitted and used by directly contacting the metal surfaces 21a and 21b.

  Next, FIG. 5 (d) shows a case where the upper and lower metal plates 11a and 11b are bent as shown in the drawing, the gap between the upper and lower sides is reduced, the stray capacitance is reduced, and leakage of the magnetic field is attempted.

The upper and lower metal surface 21a, and the distance of 21b and _{l 1,} folded up and down of the metal plate 11a, the spacing of 11b is _{l 2,} metal surface 21a and the metal plate 11a, the metal surface 21b and the metal plate 11b since the contact above and below, respectively, the upper and lower potential difference V is the same, the electric field strength E is towards the gap l ₂ is l _{1 /} l _2-fold higher.

  The influence on the coil 2 by the upper and lower metal surfaces 21a and 21b is considerably reduced by the bent metal plates 11a and 11b. Thus, FIG. 5D shows another embodiment for reducing the stray capacitance Cg and the like. From the figure, it can be understood that there is almost no stray capacitance Cg.

  FIG. 5E shows a case where the upper and lower metal plates 11a and 11b are not symmetrical. The metal plate 11b on the metal surface 21b side is bent like a toy, and surrounds the RFID tag in almost three directions (lower surface, left and right side surfaces). In the case of only the lower metal surface 21b, the coupling between the coil 2 and the metal surface 21b is weak, and the stray capacitance Cg can be reduced.

Further, by providing a slight gap l ₂ so that the upper and lower metal plates 11a and 11b do not come into contact with each other, the stray capacitance between the coil 2 and the metal surfaces 21a and 21b can be remarkably increased without generating a reverse-phase induced current. Can be reduced.

  Thus, the coupling of the coil to the surroundings and the metal surface can be suppressed by the metal plates 11 a and 11 b provided above and below the magnetic plate 6.

  FIG. 5 (f) shows the case where one of the upper and lower metal plates 11a and 11b surrounding the coil 2 is connected (right side in the figure) and the other (left side in the figure) is insulated and opened. Shows a case where the magnetic field leaks only in one gap.

  FIG. 6 shows another variation embodiment including the example shown in FIG. FIG. 6A is a diagram illustrating a case where the widths of the metal plates 11 a and 11 b are larger than the magnetic plate 6. 6 (b), 6 (c), and 6 (d) are slightly different in the structure of the end portion of the gap between the metal plates 11a and 11b on the basis of substantially the same operation principle as that of FIG. 5 (d). In FIG. 6C and FIG. 6D, since the end of the gap is long, the capacitance Cv is also increased, and the coupling between the coil current and the outside is also reduced.

  FIG. 6 (e) has the same structure as FIG. 5 (e). FIG. 6F shows a further thorough shielding of the upper metal plate 11a of FIG. 6E, and both the lower metal surface (21b) and the upper metal surface (21a) are hardly affected. 6 (g) and 6 (h) perform substantially the same operation as FIG. 5 (f).

  In FIG. 6 (i), since the upper part of the coil 2 is opened, a gap is blocked when the metal plate 11a is placed directly above, which is not appropriate. In this case, it is necessary to sandwich an insulator or a magnetic sheet Ins. Thereby, the potential of the end and the magnetic path of the magnetic field can be secured.

  FIG. 7 is an explanatory diagram of the multiple image effect. FIG. 7A shows a case where the metal plates 11a and 11b are sandwiched up and down by large external metal surfaces 21a and 21b when the metal plates 11a and 11b are small as in the case of FIG. In this case, the image effect of the metal plates 11a and 11b is of course, but the image effect of the external metal surfaces 21a and 21b is larger. As described above, the metal plates 11a and 11b are not affected by the metal surfaces 21a and 21b as much as compared with the case without the metal plates 11a and 11b as described above. . Of course, when the metal plates 11a and 11b are large, the multiple image effect is almost completely generated. In addition, the image effect by the metal plates 21a and 21b is illustrated as a multi image (multi image), and is denoted by using a suffix “i”. I represents the value of the current flowing through the coil. Actually, the thickness of the metal plates 11a and 11b is equal to or less than 0.1 mm. Therefore, it may be considered the same as the surfaces 21a and 21b.

  In the embodiment where the metal plates 11a and 11b are large as shown in FIG. 1B, there is a sufficient image effect (image effect) in the metal plates 11a and 11b, and the influence of the external metal surfaces 21a and 21b. There is almost no change because is shielded. The upper metal plate 11a and the metal surface 21a make a first image on the upper part (reference numerals 6i-1, 2i-1, etc.), and the lower metal plate 11b and the metal surface 21b make a first image on the lower part (reference numerals 6i-2, 2i). -2 etc.), the sensitivity can be increased.

  FIG. 7B shows a multiplexed image in the case of FIG. In the example shown in FIG. 6 (b), not only the upper and lower metal plates, but also a part of the metal plate covering the RFID tag from the upper and lower sides so as to surround the RFID tag. Not only that, but the metal image appears on the side.

  When the thickness of the magnetic plate 6 or the RFID tag itself is small, the area of the side surfaces of the metal plates 11a and 11b is actually small, and in this case, the side image effect is not so great. Moreover, since there is a gap between the upper and lower side plates, a complete image cannot be generated on the left and right.

  FIG. 7C is a multiplex image in the case of FIG. 6G, where the upper and lower metal plates 11a and 11b are connected on one side and opened on the other side. It is a figure which shows the image effect when only only the clearance gap exists. The thing existing in the center is a real image, and the tags existing on the upper, lower, left, right, and diagonal lines are images (images).

  Thus, in FIG. 7A, when the images of the metal plates 11a and 11b and the metal surfaces 21a and 21b are added, three images, that is, three times, and multiple images (FIGS. 7B and 7C) are obtained. Considering the occurrence, many images appear above and below. In FIG. 7B and FIG. 7C, when an image is added, the number becomes nine, that is, nine times, and the generation of an infinitely multiplexed image can be considered. Generally, there is a loss and the effect of the image becomes smaller as the distance increases.

  FIG. 8 is a diagram showing the difference between a conventional general RFID tag, a non-contact IC card, a metal-compatible tag and the multiple image system (multi-image system) of the present invention in an easy-to-understand manner.

  FIG. 8A shows a case where general RFID tags are close to each other, and a magnetic field generated by an external magnetic field and a coil current in each RFID tag has an influence. As the RFID tags come closer to each other, the mutual inductance M increases, and the resonance frequency of the RFID tag that has simply resonated with the self-inductance L greatly deviates. As a result, almost no current flows in the coil 2 and IC 3 And thus no communication with the reader's sensor.

  FIG. 8B shows a case where two non-contact type IC cards are overlapped, and in the case of non-contact type IC cards provided by different organizations (for example, watermelon (registered trademark) and PASMO (registered trademark) (Pasmo)). By changing a part of the coil of one non-contact type IC card (for example, Pasmo), it is possible to prevent complete coupling and a part of the coil is not overlapped. Like to do. In such a case, when a large number of non-contact type IC cards are overlapped, the non-contact type IC card in particular is shielded and data cannot be read by the sensor of the reader.

  FIG. 8C is a conventional rectangular RFID tag with only one metal plate 11b attached, so there is not much shielding effect or separation effect, and the coupling between RFID tags varies greatly depending on the stray capacitance between adjacent coils and magnetic coupling. To do.

  If the metal plate 11b is in the middle as shown in FIG. 8C but turned upside down, the intermediate plate disappears. When the RFID tag is placed upside down with the metal plate 11b of the upper RFID tag facing upward, the coupling between both RFID tags is further increased and becomes equivalent to the case without the metal plate 11b. The metal plate 11b is not useful in all conditions.

  FIG. 8D is a diagram showing a case where a wide metal plate 11b (or 11a), which is one of the present invention, is inserted even in the case of FIG. 8C. By doing in this way, a shielding effect, a separation effect, and an image effect can be exhibited. However, as described above, simply adding the metal plate 11b (11a) makes the resonance characteristics deviate so that it cannot be used. This is not due to the effect of one metal plate 11b, but the resonance frequency is determined in consideration of the influence of a plurality of metal plates, and each RFID tag is separated by the metal plate, and is attached to give an image effect. This is an effect exhibited by the shielding metal plate 11a (or 11b).

  FIG. 8 (e) shows a case where RFID tags (hereinafter referred to as universal smart tags) of the multiple image method of the present invention are stacked from the beginning. The metal plates 11a and 11b are attached to the universal smart tag from the beginning. Yes. Therefore, two metal plates (the metal plate 11b of the upper universal smart tag and the metal plate 11a of the lower universal smart tag) stick to each other in the overlapping portion. The upper and lower couplings due to the opening magnetic field are negligible but negligible although illustrated.

  The universal smart tag is constructed so as not to detract from the characteristics in any case, and may be directly attached to a metal body or a metal surface. Therefore, as shown in FIG. It will be understood that even if the effect is the same as inserting a board, it differs depending on the use conditions, environment, and purpose.

  FIG. 9 is a diagram illustrating a magnetic body (magnetic plate 6) for making the thin universal smart tag of the present invention flexible.

  FIG. 9A shows a flexible sheet made of, for example, 0.1 to 0.3 mm, by mixing magnetic powder (magnetic powder body) F in plastic or rubber R. In general, any method may be adopted depending on whether it is formed by cutting out from a large sheet or by extracting with a punching die, or forming from this size.

  Fig. 9 (b) Alignment of green sheets of magnetic material, for example, 0.1 to 0.3 mm thickness, followed by sintering (firing), and attaching a thin (for example, 0.1 mm or less) plastic sheet P to this A technology that uses a plastic sheet P to avoid the characteristic of being hard and fragile, like ferrite, by cutting the body into pieces (with a plurality of cuts).

  9A, 9B, etc., the x-axis, y-axis, and both axes are flexible as shown in FIGS. 9C and 9D. Even when the core material is formed and is later formed into an RFID tag or a non-contact type IC card, a flexible thin RFID tag or non-contact type IC card can be completed.

  FIG. 9 (e) shows an example in which a round object can be used by being wound. This is used, for example, when wrapped around metal, wood, plastic, animals, etc. (see FIG. 11 (f) described later).

  FIG. 9F shows a case where thin metal tapes 6S having a high magnetic permeability are arranged in the direction of the magnetic field and laminated while being insulated with a thin plastic sheet PF. The surface of the metal tape 6S is coated with an insulating film or insulated with an oxide film to insulate the metal magnetic core so that no eddy current or induced current flows. The magnetic field flows along the magnetic core. Because it is a laminate, it is also resistant to bending. In particular, when the magnetic current type antenna or sensor of the present invention is used in a frequency band where the loss increases at high frequencies and the ferrite core is not used, the method shown in FIG. That is, a magnetic current antenna with high sensitivity can be realized.

  In FIG. 10A, the coil 2 is wound around the magnetic plate 6 which is a flexible core as shown in FIG. 9 (for example, about 20 turns), and the IC is connected via the connecting wire W at this end. 3 shows the core part of the tag body connected to 3. In this state, the inductance is very large. If the metal plate or metal surface is not prepared, about 6 μH can be obtained with several turns, and it can easily resonate with the IC capacity. Therefore, it is easy to increase the inductance. I can imagine. FIG. 10B shows a cross-sectional area of the magnetic plate 6 (x × Δz; where Δz is the thickness of the magnetic plate 6), and the lateral width x is larger than that in FIG. 10A so that the magnetic flux increases. Yes.

  The length y of the magnetic path is almost the same, but even if there is a slight difference in length, it does not affect much. As y is longer, the magnetic moment becomes larger and the external magnetic field becomes stronger.

  As shown in the figure, when the image effect of merely winding the coil 2 on the magnetic plate 6 which is a flexible magnetic core is not used, the magnetic flux only doubles if the width x is doubled. As shown in FIG. 7, the excellent feature of the present invention is that metal plates 11a and 11b are provided on two or more sides, and the metal surfaces 21a and 21b are separated to suppress the short-circuit current, thereby completely suppressing the induced current (reverse phase current). In addition, a path for the magnetic field and a return path are secured. Paying attention to this point, the effect of the image is used, and the apparent magnetic field due to the image (image) is added rather than existing alone, and it is synthesized so that a large magnetic field strength exists in the gap. is there. Physically, it can be seen that the upper and lower magnetic fields are condensed only to the side due to the presence of images above and below.

  Actually, since the magnetic field of the wrinkles spreading up and down by the metal plates 11a and 11b and the metal surfaces 21a and 21b is concentrated and confined, the magnetic flux is in the space between the metal plates 11a and 11b and the metal surfaces 21a and 21b. It concentrates and the magnetic flux density becomes very large.

  As can be seen from the example of FIG. 11, an insulator such as plastic, paper, or dielectric may be placed in the space between the metal plates 11a and 11b, or a magnetic material may be placed in some cases.

  As shown in FIG. 10B, the cross section Sa of the magnetic plate 6 having a wide width x and a height Δz is x × Δz. As stated.

  The coil 2 (thickness 2ρ = 0.08 to 0.1 mm) is wound 20 times and wound along the magnetic path y direction. The end of the coil 2 is connected to the IC 3 mounted on a substrate, a film carrier, or a package by using a part of the winding as a connection line W.

  FIG. 10C shows the structure of the core portion of a special multi-image type universal smart tag.

  10 (a), 10 (b), and the coil 2 sandwiched between the metal plates 11a and 11b described so far and the magnetic plate 6 serving as the core are substantially one layer. ) Shows an example of a three-layer or multilayer core.

  By adopting such a structure, there is no space between the upper and lower surfaces sandwiched between the metal plates 11a and 11b and the metal surfaces 21a and 21b. Although only the in-phase component is added due to the image effect, in the case of FIG. 10C, a magnetic field that can be coupled to the outside even in a narrow range by adding a return magnetic path so as not to generate an anti-phase component. Is provided. Such a tag should be used for the purpose of shielding effect to prevent separation and separation from other tags when tags overlap due to increase of common-mode magnetic flux density due to multiple image effect. Good. Useful for coupling with reader sensors in tight spaces due to the return path above and below.

  FIG. 10 (d) shows another embodiment for implementing the universal smart tag of the present invention.

  In the examples so far, an example using an insulating thin wire such as an enameled wire (neomar wire, formal wire) of about 0.08 to 0.1 mm has been shown, but FIG. 10 (d) shows a thin plastic or paper sheet. It shows a method of forming a coil 2 by forming a conductor portion by etching, coating, printing or applying a thin wire, bending it in advance in consideration of the advance of the pitch, and fusing or bonding both ends. The coil 2 is etched or printed in plan on a general paper or plastic sheet, and the end of the coil is provided with a return line so as not to be short-circuited even if the coil is crossed by another insulating surface such as through a through hole. A terminal for IC 3 is provided to conduct electricity by a flip chip method or a fusion method. The return of the substrate should be insulated. However, in this case, the coil 2 is constructed by winding the film along the magnetic plate 6, and the wire at the end of the winding is not short-circuited with the wire of the other coil via the same surface or the opposite surface. A method is used in which a return line is provided and the IC 3 is fusion-connected with both terminals 22a and 22b. According to this method, the IC 3 can be mounted in almost the same process as the case where the IC 3 is mounted on the inlet of the conventional coil on the plane, which is suitable for mass production.

  FIG. 10E shows an example in which the tag is formed by bending FIG. 10D. The manufacturing method can be simplified by forming the structure of the metal plates 11a and 11b shown in FIG.

  FIG. 11 is an explanatory diagram showing how much the magnetic field generated from the core entering depending on the size of the metal plates 11a and 11b is leaked out of the metal plates 11a and 11b.

  As described above, the purpose of the metal plates 11a and 11b is to suppress both electrostatic coupling and magnetic coupling to some extent, eliminate interference between tags, eliminate influence from the metal surfaces 21a and 21b, and increase communication sensitivity. . If the metal surface is sufficiently large and is known in advance to be used for this, the metal plates 11a and 11b can be omitted and the metal surface can be substituted for the metal plates 11a and 11b.

  However, if the metal plates 11a and 11b are too small, the effect is reduced. Conversely, if the metal plates 11a and 11b are too large and only sealed in the space between the metal plates, the magnetic field does not come out. To some extent, a magnetic field is generated outside the metal plate so that communication with the external antenna can be performed.

  Therefore, as shown in FIG. 11, it is necessary to consider the usage conditions of 4 to 5 cases (cases) in order to perform communication by leaking the magnetic field to the outside.

  FIG. 11A shows a case in which the metal plates 11a and 11b are relatively small and a magnetic field leaks to the outside in the side and rear.

  As the metal plates 11a and 11b, a plastic film on which metal is vapor-deposited, a plastic film on which metal foil is laminated, or the like is used. Since the magnetic field in the forward direction is sufficiently strong, using the magnetic field in this direction is useful as a tag. Since the rear magnetic field is also relatively leaked out of the metal plates 11a and 11b, this can also be used. Since the side magnetic field is also relatively leaked to the outside of the metal plates 11a and 11b, the tag can be placed sideways and coupled with the side magnetic field for communication. In many cases, it is used in this way. The lateral width x 'of the metal plates 11a and 11b is often used at about 1 to 2 times the width x of the coil 2 and the core. As described above, the size may be set appropriately depending on the purpose of use. When used as a radiation antenna, this side radiation electromagnetic field is used.

  Next, as shown in FIG. 11B, since the metal plates 11a and 11b are long in the rear in the magnetic field axial direction y (y '), the magnetic field hardly appears in the rear. Since a magnetic field appears only in front and side of the metal plates 11a and 11b, only this magnetic field can be used for communication.

  FIG. 11C shows a case where the lateral width x 'of the metal plates 11a and 11b is increased so that the side magnetic field hardly leaks. As described above, the metal plates 11a and 11b are made by laminating or adhering a metal vapor-deposited metal foil, a metal film, metal printing or coating to a plastic film.

  As the gap between the metal plates 11a and 11b becomes narrower, the magnetic field is crushed from above and below, so that it tends to spread in the direction of the width x '. Further, as the current I flowing through the coil 2 increases, the magnetic field becomes stronger, so that the strength of the leakage magnetic field increases. If the magnetic permeability of the magnetic plate 6 is increased, the magnetic flux naturally increases. Therefore, what size should be selected varies depending on use conditions and environment. If there is no problem even if the size of the side plate or the side surface is large, it is safer to increase the size, but there is also an increase in cost.

Therefore, it is considered that the size of x ′ may be about 3 to 4 times that of x. Metal plates 11a, or filled with a plastic or paper gap l ₁ of 11b as a way to maintain a constant, method with a recess in the core to the outer metal plates and plastic, to mold Dari fitted from both sides to the tag to It may be.

  FIG. 11D shows the case where the coil 2 and the magnetic plate 6 and the IC 3 which are the cores are enclosed in relatively large metal plates 11a and 11b. If it is too large, the magnetic field will not come out. However, by providing a metal slit (slit) Sl in the metal plates 11a and 11b, the magnetic field can appear to the outside somewhat through the slit (slit) Sl. FIG. 11D shows a case where slits Sl up to about IC 3 are inserted in the metal plate 11a (solid line portion). The slit S1 may be inserted up to a portion indicated by a broken line in the drawing, that is, up to the other end of the metal plate 11a. In that case, the metal plate is divided into three. In such a case, a considerable magnetic field can be generated also on the upper metal plate side while having a multiple image effect.

  FIG. 11E shows a method in which the metal plates 11a and 11b are made small and the size of the tag is reduced to reduce leakage to the side and rear of the magnetic field and to use the magnetic field only at the front. In this method, two or three sides of the space between the metal plates 11a and 11b are surrounded by the magnetic body 6a to suppress leakage of the magnetic field. This method is useful for miniaturization, but also increases the cost, and if the effect of the surrounding magnetic body 6a is too great, there is a problem that the magnetic field does not spread.

  FIG. 11 (f) shows an example in which the flexible magnetic material shown in FIG. 9 (f) is used to make it easy to wrap around a metal, plastic, wood, animal or the like. For example, as shown in the figure, the metal plates 11a and 11b are also flexible, the metal plate 11b is longer than the metal plate 11a, and the insertion portion 13 is inserted into the insertion port 12 provided in the metal plate 11b. It is set as the structure which attaches to an object. Any example of how to wind and how to wind may be used. Although the figure is drawn as a tag, it is the same for the sensor alone. When it is wrapped around an object, a magnetic field appears around it, so that it can communicate in any direction.

Moreover, as a method of attaching the tag, for example, there are the following methods.
1. A "paste" is attached to the tag in advance so that it can be easily peeled off from the silicon paper.
2. Affix the double-sided tape on the tag so that it can be attached to the aircraft.
3. Affix the magnet to the tag and attach it to the ironware.

  In addition, illustration of the coil 2 is abbreviate | omitted from Fig.11 (a)-FIG.11 (e).

  FIG. 12 shows a case where a conventional metal-compatible tag is improved by using the multiple image effect (multi-mirror (image) effect) of the present invention. Up to now, the flexible magnetic plate 6 has been used to implement the present invention as a universal smart tag, but a hard (hard) magnetic material with a metal applied to one side is used as in the conventional trial production. Or you may.

  FIG. 12A is a perspective view showing a case where a conventional metal-compatible tag is improved using the multiple image effect of the present invention. On one surface FPCB of the polyimide thin flexible substrate, the terminal T and the wiring W for mounting the IC 3 and one side of the coil 2 are etched, and the metal surface 1 is left on the other surface. The metal surface 1 'becomes the metal plate 11a, and the metal surface 1 becomes the metal plate 11b. Then, only the part of the return line at the other end of the coil 2 is insulated from the metal surface 1 (W in FIG. 12C), and because of the vertical through hole for making the coil 2, only this part is made circular. It is removed (the hole in the metal plate 11a in FIG. 12E). When using three layers instead of two upper and lower surfaces and making a return line on an intermediate metal surface, only the through-hole portion needs to be considered. Reference numeral 2 'denotes a portion where a coil will be formed later (only a part is shown), and 4 denotes a capacitor.

  Similarly, the coil 2 on the upper surface is made of a polyimide substrate, and a magnetic body baked with a green sheet, a magnetic core baked with a powdered magnetic body formed with a mold, or a flexible magnetic body core is sandwiched in between. Then, pins (Pin) are set up in the upper and lower through holes, and the upper and lower lines are conducted to form the coil 2.

  FIG. 12B shows a case where the tag thus formed is viewed from the side. The lower substrate is a flexible substrate FPCB, and a polyimide substrate is used as an example. The lowest layer is the metal surface 1 of the copper foil surface, and the next layer is made of a polyimide insulating layer PI. The next layer is a metal foil layer ME for forming one side of the coil 2 and a metal wire layer ME for forming connection wires and terminals for mounting the IC 3. A conductive line layer serving as a return line may be provided in the middle, or a conductive wire W may be formed by insulating a part of the copper foil surface which is the lowest metal surface 1 (FIG. 12C). This conductive wire needs to be subjected to surface treatment such as insulation with a paint or the like after completion of etching and pin conduction.

Is better hardened plastic P ₀ or the like for the uniform surface and finished by after mounting the IC 3 potting or molding or cover or the like.

  FIG. 12D shows a case where the protrusions of IC 3 can be projected on the surface. In this case, an antenna portion is formed by sandwiching the magnetic plate 6 with a flexible substrate FPCB (polyimide substrate or the like) on both the upper and lower sides, and a conductor and a terminal portion for mounting the IC 3 are formed on a part of the upper portion. Conduction with the surface on which the middle coil is formed is made through a through hole of an insulating layer of polyimide. The upper and lower wires are connected to form the coil 2 through a pin Pin standing in a through hole. The manufacturing method is similar in FIGS. 12 (a), 12 (b), and 12 (c).

  FIG. 12E is drawn leaving the substrate FPCB on the upper surface in the case of FIG. FIG. 12A is omitted because the lower coil surface cannot be seen when a metal surface or FPCB surface is drawn, but in FIG. 12E, the inner coil surface is omitted. In this way, a portion where the metal for the through hole is circularly drawn is drawn on a part of the surfaces of the metal plates 11a and 11b by the upper metal foil.

  FIG. 13A is a diagram showing an example in which a sensor is applied to a SIM (Subscriber Identification Module) used in a GSM system (Global System for Mobile communications) or the like, and a metal plate 11a, 11b and a coil 2 of the sensor. The magnetic field is concentrated across the central magnetic plate 6 and the influence of the external metal surfaces 21a and 21b is removed. The SIM of FIG. 13A may be used in the mobile phone MP, or may be directly inserted from the outside through the slit 57 as shown in the figure. A cellular phone usually has a metal surface such as a chassis and a battery. Even in such a case, the technology of the present invention can be used effectively.

  FIGS. 13B and 13C show a case where SIM is applied so as to correspond to a USB card or an SD card, which can be used corresponding to a mobile phone or a PC. The SIM 50 of FIG. 13B is equipped with an IC for a mobile phone, and is connected to an NFC (Near Field Communication) chip by, for example, a single wire protocol (SWP), and the sensor of the present invention is attached via a matching unit. It has been. Further, from the beginning, the IC 3 can be used by using a dual IC having both contact and non-contact functions and connecting a non-contact terminal to the sensor coil of the present invention. As described above, the NFC communication can be performed by inserting the SIM card directly into a mobile phone or a PC by extrapolation. It can also be connected to a PC or the like via an SD card type holder. Further, it can be similarly applied to an SD card or a USB stick type communication card.

  For example, in FIG. 13A, the SIM 50 is inserted directly into an SD card type adapter (SD card) 51 and inserted into a PC card slit (PC slit) 52. Here, 7 is a SIM terminal, 9 is a flexible substrate such as polyimide or a film carrier, and 53 is an NFC chip (NFC chip). In FIG. 13B, the SIM 50 is inserted into a USB stick type adapter 54 (USB 54) and inserted into a USB port of a PC. FIG. 13C shows a case where a sensor is applied to a mini SD card 56 (antenna portion: magnetic plate 6 and coil 2), which can be applied to a mobile phone or a PC, and NFC (Near Field Communication) communication. Can be realized. Reference numeral 55 denotes a contact terminal of the mini-SD card 56, which is not shown but is on the lower side of the drawing.

  13 (d), 13 (e), and 13 (f), the SIM has a non-contact communication function due to the dual chip function built in the SIM and the configuration using the NFC chip, and the magnetic field generated from this sensor coil. FIG. 3 shows three embodiments for transmitting a signal to an antenna ANT attached to the mobile phone body using the. Since there are various methods of attaching the SIM, three examples of the method of coupling with the SIM will be described here.

  FIG. 13D shows an example in which the SIM is fitted from above. A system in which a magnetic field generated by a sensor coil 2 attached to the tip of a SIM is received by a transmission / reception coil CC in a mobile phone, a signal is transmitted to an antenna ANT of a mobile phone connected to this point, and the signal is transmitted to the outside It is.

  In order to improve electromagnetic coupling with the sensor coil 2 of the SIM, an E-shaped magnetic body 66 that secures a return path of the magnetic field is used, and a coupling coil CC is wound around this central magnetic path. Although this coil and the ANT coil may be integrated, in this case, the capacitor 44 must be connected to a part of the coil CC so as to resonate at f = 13.56 MHz. Moreover, you may insert the booster circuit for sending a strong signal to the exterior on the way.

  FIG. 13E shows a case where the SIM is inserted along a slit or the like. FIGS. 13E and 13A are perspective views, and FIGS. 13E and 13B are cross-sectional views of the sensor coil 2 and the coupling coil CC (for the sake of clarity, the antenna ANT is a perspective view). .

  A coupling coil CC is attached to the mobile phone so as to surround the sensor coil 2 attached to the SIM. The coil CC and the cellular phone antenna ANT are continuously connected.

  As in the case of FIG. 13D, the capacitor 44 is connected so that the resonance current flows through the entire coil itself. Since the metal plates 11a and 11b of the SIM are almost the same as the width of the magnetic body, most of the magnetic field appears on the side, and this magnetic field is well coupled with the external cylindrical coil CC. . Since there are many metal surfaces on the outside of the external coil, particularly above and below, it is better to dispose the magnetic or insulating layer INS outside the coupling coil CC.

  FIG. 13 (f) uses a dual IC chip and connects the non-contact signal part of the IC to the 7th and 8th terminals of the SIM terminal, the so-called RFU (Reserved for Future Use) terminal. The case of connecting to the antenna ANT of the mobile phone is shown.

  Next, a universal smart tag (UST) (non-contact information storage medium) of the present invention, a reader / writer device (information reading / writing device) that applies the present invention for reading and writing the information to a sensor, A management system including a personal computer (PC) (information processing apparatus) for processing will be described using various examples.

  In FIG. 14A, a sensor / sensor coil 141 (a coil portion is shown by a broken line) for generating a vertical magnetic field is connected to a reader / writer unit (R / W) 143 via a matching unit (Mt) 142. An application example in which information read by a writer (R / W) 143 is displayed and recorded on a personal computer (PC) 144 is shown. Information of the universal smart tag (UST) 140 of the present invention can be read as shown.

  FIG. 14B shows a case where the universal smart tag (UST) 140 of the present invention is attached to the PC body, for example, for management of a PC having a metal surface. FIG. 14 (c) shows a case where the universal smart tag (UST) 140 of the present invention is attached to a file or book, particularly the back of the cover. FIG. 14D shows a case where the universal smart tag (UST) 140 of the present invention is attached to a CD or DVD case. The universal smart tag (UST) 140 of the present invention can be used for any metal, paper, plastic as shown. That is, as shown in FIG. 14B to FIG. 14D, even when the universal smart tag (UST) 140 overlaps, the sensor 141 of the reader shown in FIG. ) 140 information can be read.

  FIG. 15 shows still another embodiment. The sensor in FIG. 15 is a sensor 151 that generates a horizontal magnetic field. A universal smart tag (UST) 140 attached to a metal surface of a PC, equipment, instrument, tool, etc. It also shows that the universal smart tag (UST) 140 can be read even when it is sandwiched between them, and an object having a metal surface such as a PC can be identified and managed. A reader / writer unit (R / W) 153 and a personal computer (PC) 154 process information read by the reader / writer unit (R / W) 153.

  FIG. 16 illustrates a thin sensor 161 having the same configuration as that of a thin universal smart tag by using the characteristics of the universal smart tag (UST) of the present invention (in the figure, a coil on the sensor side is provided under the sensor plate). The universal smart tag (UST) 160 and the sensor 161 are put together, and a part of the universal smart tag (UST) 160 is covered with the metal part 162 of the sensor 161 so that the magnetic field does not leak, and other universal smart tags UST An example in which separation from the sensor and the sensor is made complete is shown. With such a structure, each universal smart tag UST and sensor are separated, so that each universal smart tag UST can be written, and there is any universal smart tag in any place and any sensor. It can also be determined.

  As another application example of how to attach the tag, a case where a universal smart tag is attached to a gap where a PC to be folded (for example, a notebook PC) is folded can be considered. Moreover, the case where a universal tag is stuck in the folding gap of a mobile phone can be considered. In such a case, the magnetic field is taken out from this gap.

  As described above, a thin tag, module, card, or sensor using the multiple image method of the present invention has a multiple image method even in an environment where the sensitivity deteriorates due to the presence of a metal surface or the proximity of an RFID tag. By using the technology for increasing sensitivity, it is possible to read information held by tags, modules, and cards, and to manage and organize all sorts of things such as thin books, files, and metal surface plastics.

  In the present embodiment, a flat magnetic material (that is, a rectangular cross section) and two metal plates are used. However, the magnetic body as the magnetic core is not limited to a flat plate, and may be, for example, a polygon such as a triangle or a cylindrical shape. In this embodiment, two metal plates facing each other with the magnetic material interposed therebetween are described as an example. However, the metal plates may be a plurality of metal plates arranged along the magnetic material. For example, if the cross section of the magnetic core is triangular, three metal plates along the triangular pyramid surface can be considered. Further, when considering a plurality of metal plates, some of them may be continuous (for example, see FIG. 6 (h) when considering two metal plates). The reason why “a part” of the plurality of metal plates is discontinuous is that at least one part needs to be cut so as not to generate a reverse phase current due to a closed circuit.

(A) A cross-sectional view of the universal smart tag when the width of the metal plate and the magnetic plate is substantially the same, (b) a cross-sectional view of the universal smart tag when the metal plate is larger than the width of the magnetic plate, (c) ( A view from above, a view from above (d) and (b) (A) The figure which shows the case where a metal plate is provided above and below a magnetic body plate, and a metal surface exists up and down, (b) The case where a metal plate is provided above and below a magnetic body plate, and only one metal surface The figure which shows the case where it exists, (c) The figure which shows the case where a metal surface exists up and down by the structure of only one conventional metal plate, (d) The structure of only one conventional metal plate, Diagram showing the case where only one sheet exists BRIEF DESCRIPTION OF THE DRAWINGS It is a figure explaining the advantage of the universal smart tag of this invention, and the problem of the conventional metal corresponding | compatible tag, (a) The perspective view drawn so that the coil of RFID tag could be seen, (b) Only one conventional metal plate Perspective view showing no case Perspective view showing the magnetic field distribution when a coil is wound around a thin flat magnetic body or rectangular magnetic body vertically It is a figure which shows the kind of metal plate of the universal smart tag of this invention, (a) The figure which shows the case where it arrange | positions with a fixed space | interval between a metal plate and a metal surface, (b) The figure of Fig.1 (a) The figure explaining a case, (c) The figure which shows a case where there are a metal plate in the upper and lower sides, and there is a metal surface only in the lower part, (d) The example which bent the upper and lower metal plates, and also made the clearance gap between the upper and lower sides smaller (E) The figure which shows the case where the upper and lower metal plates are not symmetrical, (f) The figure which shows the case where one of the upper and lower metal plates is connected and the other is insulated. (A)-(i) The figure which shows the kind of metal plate of the universal smart tag of this invention The figure which shows a mode that the image (image) by a metal surface changes with the shape and kind of a metal plate, (a) The figure which shows the case where it is pinched up and down by the big external metal surface when a metal plate is small, (b) FIG. 6B is a diagram showing a multiplex image in the case of FIG. 6B, FIG. 6C is a diagram showing a multiplex image in the case of FIG. (A) The figure which shows the case where the general RFID tag has overlapped near, (b) The figure which shows the case where two non-contact type IC cards have overlapped, (c) One metal plate with the conventional square RFID tag The figure which shows the case where it attaches, (d) The figure which shows the case where a wide metal plate is inserted, (e) The figure which shows the case where the universal smart tag by the multiple image system of this invention is piled up (A) The figure which comprised the flexible magnetic body sheet, (b) The figure which shows another example which comprised the flexible magnetic body sheet, (c) It has flexibility with respect to x-axis (D) A figure showing flexibility with respect to the y-axis, (e) A figure showing an example of being wound around a round object, and (f) Insulating from a metal magnetic plate The figure which shows the case where the film is piled up alternately (A) (b) omits the metal plate, and (a) connects the coil to the flexible magnetic plate and connects the IC to the end of the magnetic core and the coil wound on it. The figure which shows the core part of the tag main body which is carrying out, (b) The figure which shows the case where a wide magnetic board is used, (c) The figure which shows the structure of the core part at the time of forming a magnetic board in multiple layers (D) The figure which shows the structure of the core of the universal smart tag of another example, (e) The figure which shows the example in which (d) is bent and a tag is formed (A) The figure which shows the case where a metal plate is comparatively small and the magnetic field has leaked outside to the side and back, (b) The figure which shows the case where the metal plate is comprised long behind the y direction, (c) ) A diagram showing a case where the lateral width of the metal plate is widened so that the side magnetic field hardly leaks. (D) A diagram showing a case where a relatively large metal plate is used and the metal plate is cut. (E) A diagram showing a case where three sides of a space sandwiched between metal plates are surrounded by a magnetic material, (f) A flexible magnetic material is used to make it easy to wrap around metal, plastic, wood, animals, etc. Illustration showing the case It is a figure which shows another method of making the universal smart tag of this invention, (a) The perspective view which shows the case where the conventional metal corresponding | compatible tag is set as the structure suitable for mass production using the multiple image effect of this invention, (b) Molding completion The figure which shows the case where the tag which was done is seen from the side, (c) The figure which shows the case where a part of copper foil which is the lowest metal surface is insulated and made the conducting wire W, (d) The protrusion by IC protrudes on the surface The figure which shows the case where it does not interfere, (e) The figure which shows the case where the metal is removed in a circle for the vertical through hole for making the coil (A) The figure which shows the example at the time of applying a sensor to SIM, (b) The figure which shows the case where SIM is inserted in a USB stick type adapter, (c) The figure which shows the case where a sensor is applied to a mini SD card, (D) Explanatory drawing in the case of exciting a mobile antenna by a coil coupled with a SIM coil, (e) A diagram showing a state in which the mobile antenna is excited by electromagnetic waves obtained by a coil surrounding the SIM coil. f) The figure which shows a mode that a mobile antenna is excited using the 7th, 8th terminal (RFU) terminal of SIM. It is a figure which shows the example of a use of the universal smart tag of this invention, and the example of a sensor, (a) The figure which shows the application example of the sensor coil which produces a perpendicular magnetic field, (b) The universal smart tag of this invention is attached to PC main body (C) A diagram showing a case where the universal smart tag of the present invention is attached to the back of the cover of a file or book. (D) A universal smart tag of the present invention is attached to a CD or DVD case. Figure showing the case The figure which shows the example of another use of the universal smart tag of this invention, and the example of a sensor The figure which shows the example at the time of making a pair of the sensor of the same structure as the universal smart tag of this invention

Explanation of symbols

2 Coil 3 IC (IC chip)
6 Magnetic plate (magnetic core)
11a, 11b Metal plate (conductive plate or conductive film)
21a, 21b Metal surface 140 Universal smart tag (UST) (non-contact information recording medium)
141 Sensor
142 Matching Unit 143 Reader / Writer (R / W)
144 Personal computer (PC)
151 Sensor
153 Reader / Writer (R / W)
154 Personal Computer (PC) (Information Processing Device)
160 Universal Smart Tag (Non-contact information recording medium)
161 sensor (information reading / writing device)
162 Metal part of the sensor

Claims (21)

A coil with a magnetic core;
A plurality of conductive plates or conductive films arranged in parallel with the direction of magnetic flux of the magnetic core-containing coil and on the upper and lower surfaces along the magnetic core-containing coil ,
The wireless transmission / reception apparatus , wherein the magnetic flux is converged in a space between the plurality of conductive plates or conductive films by a multiple image effect by the plurality of conductive plates or conductive films . The magnetic core includes a radio transceiver device according to claim 1, characterized in that a magnetic thin plate shape. The wireless transmission / reception device according to claim 1,
The wireless core is formed so that the magnetic core has flexibility by firing a green sheet or a magnetic material and attaching a plastic sheet to one or both surfaces of the magnetic core. The wireless transmission / reception device according to claim 1,
The wireless core is formed by mixing rubber or plastic and a magnetic powder so as to have flexibility. The wireless transmission / reception device according to claim 1,
The wireless core is formed of a laminated structure in which the magnetic core is formed of a thin magnetic film having a high magnetic permeability and is insulated by an oxide film, a coating, or a plastic film. The wireless transmission / reception device according to claim 4 or 5,
One of the plurality of conductive plates or the conductive film is made longer than the others, and the wireless transmission / reception device is characterized in that In the radio | wireless transmitter / receiver apparatus in any one of Claims 1 thru | or 5,
The plurality of conductive plates or conductive films are formed using an aluminum plate, metal foil, metal coating, metal vapor deposition, or metal ink. In the radio | wireless transmitter / receiver apparatus in any one of Claims 1 thru | or 5,
At least one of the plurality of conductive plates or conductive films uses a flexible substrate. In the radio | wireless transmitter / receiver apparatus in any one of Claims 1 thru | or 5,
The wireless transmission / reception apparatus, wherein the plurality of conductive plates or conductive films are made of a film in which a metal foil is laminated on a plastic film. In the radio | wireless transmission / reception apparatus in any one of Claims 1 thru | or 9,
The wireless transmission / reception apparatus, wherein the plurality of conductive plates or conductive films have a larger area than a surface of the magnetic core inserted between the plurality of conductive plates or conductive films. The wireless transmission / reception device according to claim 10,
The gap of the plurality of conductive plates or conductive film, radio transceiver devices, wherein an insulating material, the space is the magnetic core coil with a dielectric or a portion magnetic absent filled. The wireless transmission / reception device according to any one of claims 1 to 11,
A part of the plurality of conductive plates or conductive films is continuous. The wireless transmission / reception device according to any one of claims 1 to 12,
The wireless transmission / reception device is used not only as an electromagnetic coupling sensor but also as a radio transmission / reception antenna, or as both electromagnetic coupling and radio transmission / reception antenna. A wireless transmission / reception device according to any one of claims 1 to 13,
An IC chip connected to the coil;
With
A non-contact information recording medium which transmits / receives information to / from an information reading / writing device via the wireless transmission / reception device. The non-contact information recording medium according to claim 14,
The coil is formed by winding a plastic sheet on which a metal wire is arranged by etching or printing around the magnetic core,
The IC chip is connected to one end of the coil and the other end of the coil disposed from a surface opposite to the surface of the plastic sheet on which the metal wire is disposed. A non-contact information recording medium characterized by the above. The wireless transmission / reception device according to claim 6;
An IC chip connected to the coil;
With
The conductive plate or conductive film which is longer than the other of the plurality of conductive plates or conductive films is formed so that both ends can be held by bending the conductive plate or conductive film. Contact information recording medium. The contactless information recording medium according to claim 14 or 15,
A non-contact information recording medium, wherein the wireless transmission / reception device and the IC chip are mounted on a SIM, SD card, mini SD card or USB stick.   The non-contact information recording medium according to claim 17, wherein the SIM, the SD card, the mini SD card, or the USB stick has a short-range communication function. The non-contact information recording medium according to any one of claims 14 to 18,
The IC chip has a dual function of a contact type and a non-contact type, and is a non-contact information recording medium. A wireless transmission / reception device according to any one of claims 1 to 13,
An information reading / writing apparatus for performing transmission / reception of information with a non-contact information recording medium via the wireless transmission / reception device. A non-contact information recording medium according to any one of claims 14 to 19,
An information reading / writing device according to claim 20,
An information processing device for processing information of the non-contact information recording medium read by the information reading / writing device;
A management system comprising:

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