JP5626043B2 - RFID reader / writer with RFID tag function and RFID reader / writer module with RFID tag function - Google Patents

Description

  The present invention relates to an RFID reader / writer having an RFID tag function, and more particularly to an RFID reader / writer having an RFID tag function that can adjust and change the characteristics of an RFID reader / writer module later. The present invention also relates to an RFID reader / writer module having an RFID tag function used in the RFID reader / writer having the RFID tag function.

  Recently, RFID systems that store information and take out wireless communication from a short distance are frequently used as product tags, transportation cards, employee ID cards, and the like.

  The RFID system includes an RFID tag and an RFID reader / writer, and is used in pairs. Specifically, the RFID tag operates with the energy transmitted from the RFID reader / writer, and stores the information transmitted from the RFID reader / writer, for example, in a memory unit in the IC. The RFID tag operates with the energy transmitted from the RFID reader / writer, and transmits the stored information to the RFID reader / writer.

  Some RFID reader / writers used in such RFID systems have a function as an RFID tag in addition to a function as an RFID reader / writer. For example, in Patent Document 1 (Japanese Patent Laid-Open No. 2008-22435), as an RFID reader / writer, in addition to the function of writing information to other RFID tags and reading information from other RFID tags, A portable terminal having a function of writing information into another RFID reader / writer or reading information from another RFID reader / writer is disclosed. Since this portable terminal can perform two functions by one, it is very convenient.

  On the other hand, in RFID reader / writers and RFID tags, modularization of main components is being promoted for the purpose of improving productivity at the time of manufacture. For example, in an RFID reader / writer, an RFID reader / writer module that incorporates most of the components other than the antenna in one is manufactured in advance, and when the RFID reader / writer is manufactured, the RFID reader / writer module, the antenna, It is only necessary to assemble a few other electronic components. Similarly, modularization of main components is being promoted in the RFID tag as well.

JP 2008-22435 A

  The modularization of the main components of the RFID reader / writer and the RFID tag described above improves productivity when manufacturing the RFID reader / writer and the RFID tag, and is very useful. However, once the RFID reader / writer module and the RFID tag module are manufactured, there is a problem that it is extremely difficult to adjust the characteristics or change the characteristics. For example, the capacitance value of the capacitor incorporated in the module needs to be changed, and it was extremely difficult to change it later.

  However, in the manufacturing process of the RFID reader / writer and the RFID tag, it is often required to change the characteristics of the module. For example, an RFID reader / writer module was designed and manufactured in advance in consideration of compatibility with an antenna for use in combination with an antenna. For some reason (insufficient product, defective product, etc.) The antenna may not be available. In this case, an alternative antenna must be used, but the module characteristics may have to be changed due to different impedances. If the characteristics of the module cannot be changed, a new RFID reader / writer module that matches the alternative antenna must be redesigned and remanufactured. Sometimes it became.

  The present invention has been made to solve the above-described problems of the prior art. Specifically, according to the present invention, in the RFID reader / writer having the RFID tag function, the module characteristics can be adjusted and changed later. As the means, the RFID reader / writer having the RFID tag function of the present invention includes an RFID reader / writer module and an antenna, and the RFID reader / writer module has first, second, third and fourth external connection terminals. The RFID reader / writer module includes an RFID reader / writer IC having an RFID tag function. The RFID reader / writer IC includes a first transmission terminal, a second transmission terminal, a first transmission terminal, a first transmission terminal, and a first transmission terminal. 2 having a tag function terminal, and in the RFID reader / writer module, the first transmission terminal is connected to the first external connection terminal, the second transmission terminal is connected to the second external connection terminal, and the first The tag function terminal is connected to the first external connection terminal through at least the first coupling capacitor, and the second tag function terminal is at least the second coupling. Connected to the second external connection terminal via a capacitor, further the first tag function terminal is connected to the third external connection terminal, the second tag function terminal is connected to the fourth external connection terminal, The first and second external connection terminals and the antenna are connected outside the RFID reader / writer module.

  In addition, it connects between the connected 1st transmission terminal and 1st external connection terminal, between the connected 2nd transmission terminal and 2nd external connection terminal via the 1st coupling capacitor. Between the first tag function terminal and the first external connection terminal, and between the second tag function terminal and the second external connection terminal connected via the second coupling capacitor. In addition, at least one between the first tag function terminal and the third external connection terminal and between the connected second tag function terminal and the fourth external connection terminal is further provided with necessary electronic components. You may make it interpose. In this case, peripheral circuits such as a filter circuit and a matching circuit can be further configured.

  Further, outside the RFID reader / writer module, a capacitor is connected between at least one of the first external connection and the third external connection terminal and between the second external connection and the fourth external connection terminal. May be. In this case, the characteristics of the RFID reader / writer module can be adjusted or changed.

  Further, a capacitor may be connected in parallel with the antenna outside the RFID reader / writer module. In this case, the resonance frequency can be adjusted.

  Further, a capacitor may be connected in parallel with the antenna inside the RFID reader / writer module. In this case, the resonance frequency can be adjusted.

  The RRF reader / writer module having the RFID tag function of the present invention includes first, second, third, and fourth external connection terminals, and also includes an RRF reader / writer IC, and the RFID reader / writer IC. Comprises first and second transmission terminals, a reception terminal, and first and second tag function terminals, the first transmission terminal being connected to the first external connection terminal, and the second transmission terminal being Connected to the second external connection terminal, the first tag function terminal is connected to the first external connection terminal via at least the first coupling capacitor, and the second tag function terminal is at least for the second coupling The capacitor is connected to the second external connection terminal, the first tag function terminal is connected to the third external connection terminal, and the second tag function terminal is connected to the fourth external connection terminal. I did it.

  Since the RFID reader / writer having the RFID tag function of the present invention has the above-described structure, the characteristics of the RFID reader / writer module can be easily adjusted and changed later.

1 is a perspective view showing an RFID reader / writer 100 according to a first embodiment of the present invention. FIG. 2 is an equivalent circuit diagram of the RFID reader / writer 100 shown in FIG. 1. It is a perspective view which shows the RFID reader / writer 200 concerning 2nd Embodiment of this invention. FIG. 4 is an equivalent circuit diagram of the RFID reader / writer 200 shown in FIG. 3.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.

[First Embodiment]
1 and 2 show an RFID reader / writer 100 having an RFID tag function according to a first embodiment of the present invention. 1 is a perspective view, and FIG. 2 is an equivalent circuit diagram.

  An RFID reader / writer 100 having an RFID tag function includes a mother substrate 1.

  An RFID reader / writer module 2 is mounted on the mother substrate 1.

  The RFID reader / writer module 2 includes a substrate 3. On the surface of the substrate 3, an RFID reader / writer IC4, coupling capacitors C51 and C52, a resonance frequency adjusting capacitor C3, and a plurality of other types that perform a specific function or constitute a peripheral circuit. A plurality of electronic components 5 are mounted, and a resin 6 is molded. In the RFID reader / writer module 2, external connection terminals T 1, T 2, T 3, and T 4 are formed on the end surface of the substrate 3.

  In FIG. 1, the resin 6 is not shown so that the inside can be seen, and is shown by a chain line. Further, the electronic component 5 inside the RFID reader / writer module 2 shown in FIG. 1 is shown as a reference example and does not exactly match the equivalent circuit shown in FIG.

  The RFID reader / writer IC 4 has a function of sending information to be transmitted to the RFID tag, a function of receiving information transmitted from the RFID tag, a function of writing information transmitted from another RFID reader / writer, and a function of another RFID reader / writer. A function of sending information written in accordance with a command to the RFID reader / writer is provided. The RFID reader / writer IC 4 includes transmission terminals TX1 and TX2 that send information to the RFID tag, a reception terminal RX that receives information from the RFID tag, and tag function terminals PF1 and PF2 that receive and send information as RFID tags. (Not shown in FIG. 1).

  The following connections are made inside the RFID reader / writer module 2.

  First, the transmission terminal TX1 is connected to the external connection terminal T1 via the coil L1 and the capacitor C21, and the transmission terminal TX2 is connected to the external connection terminal T2 via the coil L2 and the capacitor C22.

  Further, the tag function terminal PF1 is connected to the external connection terminal T1 via the coupling capacitor C51, and the tag function terminal PF2 is connected to the external connection terminal T2 via the coupling capacitor C52.

  Further, the tag function terminal PF1 is connected to the external connection terminal T3, and the tag function terminal PF2 is connected to the external connection terminal T4.

  In addition, capacitors C11 and C12 connected in series are connected between a connection point of the coil L1 and the capacitor C21 and a connection point of the coil L2 and the capacitor C22. And then. The connection point between the capacitors C11 and C12 is grounded.

  A resonance frequency adjusting capacitor C3 is connected between a connection point between the capacitor C21 and the external connection terminal T1 and a connection point between the capacitor C22 and the external connection terminal T2.

  Further, the external connection terminal T2 and the reception terminal RX are connected via the resistor R1 and the capacitor C7, and the reception terminal RX is connected to the ground via the resistor R2 and the capacitor C8.

  On the other hand, outside the RFID reader / writer module 2, an antenna 7 is formed on the surface of the mother substrate 1 by a spiral conductive line pattern. One end of the antenna 7 is connected to the external connection terminal T1 of the RFID reader / writer module 2, and the other end of the antenna 7 is connected to the external connection terminal T2 of the RFID reader / writer module 2.

  In FIG. 1, the antenna 7 has a spiral shape of two rounds, but may be one round or more than two rounds. In the case of a spiral shape having two or more rounds, the conductive line patterns intersect on the way. For this reason, in this embodiment, as shown in FIG. 1, the insulating layer 8 which insulates the conductive line pattern from each other is provided at the intersection. Alternatively, a pair of through holes may be formed by penetrating the mother substrate 1 and one conductive line pattern may be detoured to the back side of the mother substrate 1 so as not to be short-circuited.

  A resonance frequency adjusting capacitor C4 is mounted on the mother substrate 1 so as to be connected in parallel to the antenna 7.

  In the RFID reader / writer 100 having the RFID tag function having such a connection structure, coupling capacitors C51 and C52 are for coupling the tag function terminals PF1 and PF2 of the RFID reader / writer IC4 to the antenna 7. As the coupling capacitors C51 and C52, capacitors having appropriate capacitance values are used according to the impedance of the antenna 7 or the like.

  In the RFID reader / writer 100 having an RFID tag function, the coils L1 and L2 and the capacitors C11 and C12 constitute a filter circuit.

  The capacitors C21 and C22 are used for DC cut.

  In addition, the resonance frequency adjusting capacitor C3 provided inside the RFID reader / writer module 2 and the resonance frequency adjusting capacitor C4 provided outside the RFID reader / writer module 2 are used to adjust the resonance frequency of the RFID reader / writer 100 together. Used to adjust. If the capacitance value of the resonance frequency adjustment capacitor C3 is made larger than the capacitance value of the resonance frequency adjustment capacitor C4, the resonance frequency adjustment capacitor C3 is used for coarse adjustment, and the resonance frequency adjustment capacitor C4 is used for fine adjustment. Therefore, frequency adjustment with higher accuracy can be performed. In this case, the RFID reader / writer module 2 is designed and manufactured using a capacitor having a capacitance value smaller than that necessary for adjusting the resonance frequency as the coarse adjustment resonance frequency adjustment capacitor C3. In addition, the insufficient capacitance value may be compensated by the fine tuning resonance frequency adjusting capacitor C4.

  Further, the resistor R1, the capacitor C7, the resistor R2, and the capacitor C8 are used to adjust the amplitude and DC bias of the signal input to the receiving terminal RX.

  In the RFID reader / writer 100 having the RFID tag function according to the present embodiment, the external connection terminals T3 and T4 of the RFID module 2 are connected to wirings formed on the mother substrate 1, respectively. Since these wirings are not connected to any function or electronic component, they are terminated. However, if a capacitor is mounted on the land P1 formed on the mother substrate 1, the capacitor can be connected between the external connection terminals T1 and T3, in other words, in parallel with the coupling capacitor C51. Similarly, if a capacitor is mounted on the land P2 formed on the mother substrate 1, the capacitor can be connected between the external connection terminals T2 and T4, in other words, in parallel with the coupling capacitor C52. That is, in the RFID reader / writer 100 having the RFID tag function, the capacitance values of the coupling capacitors C51 and C52 inside the RFID reader / writer module 2 can be adjusted or changed later.

  When the RFID reader / writer 100 having the RFID tag function is used as an RFID reader / writer, information sent from the transmission terminals TX1 and TX2 of the RFID reader / writer IC 4 is sent to the RFID tag via the antenna 7. The information transmitted from the RFID tag is received by the reception terminal RX of the transmission terminal 4 of the RFID reader / writer IC 4 via the antenna 7. On the other hand, when used as an RFID tag, the tag function terminals PF1 and PF2 of the RFID reader / writer IC4 change the impedance according to the signal from the other RFID reader / writer, thereby changing the reflection state of the signal. Communicate with other RFID reader / writers, store information transmitted from other RFID reader / writers in the RFID reader / writer IC4, and transmit information stored in the RFID reader / writer C14 to other RFID reader / writers To do.

  The RFID reader / writer 100 having the RFID tag function can be manufactured, for example, by the following method.

  First, a mother substrate 1 having an antenna 7 formed in advance on the surface is prepared.

  Further, in order to manufacture the RFID reader / writer module 2, a substrate 3 is prepared in which predetermined wirings are formed in advance on the surface and external connection terminals T1, T2, T3, and T4 are formed on the end surfaces. Then, the RFID reader / writer IC 4, the coupling capacitors C51 and C52, the resonance frequency adjusting capacitor C3, and the predetermined electronic component 5 are mounted on the substrate 3 by, for example, reflow soldering.

  Then, a thermosetting resin that is heated to a semi-molten state on the surface of the substrate 3 on which the RFID reader / writer IC 4, the coupling capacitors C 51 and C 52, the resonance frequency adjusting capacitor C 3, and the predetermined electronic component 5 are mounted. The sheet is coated and further heated and cured to form the resin 6 and the RFID reader / writer module 2 is completed.

  Next, the RFID reader / writer module 2, the resonance frequency adjusting capacitor C4, and other necessary electronic components (not shown) are mounted on the mother substrate 1 by, for example, reflow soldering.

  By mounting the RFID reader / writer module 2, the second resonance frequency adjusting capacitor C4, and other necessary electronic components on the mother substrate 1, the RFID reader / writer module 100 having the RFID tag function according to the present embodiment is provided. Is completed.

  The RFID reader / writer 100 having the RFID tag function according to the first embodiment and an example of the manufacturing method thereof have been described above. However, the present invention is not limited to these contents, and various modifications can be made along the gist of the invention.

  For example, the circuit configured in the RFID reader / writer module 2 is arbitrary, and is not limited to the contents described above. Further, the substrate 3 on which the IC 4 for RFID reader / writer, the first resonance frequency adjusting capacitor C3 and the like are mounted may not be protected by the resin 6, but may be protected by, for example, a metal case.

  Further, the shape and size of the antenna 7 are arbitrary, and are not limited to the above-described contents. Further, the antenna 7 may be configured as a separate part and mounted on the surface of the mother substrate 3 instead of being formed on the surface of the mother substrate 1.

  In the present invention, the transmission terminal and the tag function terminal are two terminals, but it is also conceivable that one terminal can be developed in the same configuration. In this case, the external connection terminals T1, T2, T3, and T4 are only corresponding terminals.

[Second Embodiment]
3 and 4 show an RFID reader / writer 200 having an RFID tag function according to a second embodiment of the present invention. 3 is a perspective view, and FIG. 4 is an equivalent circuit diagram.

  The RFID reader / writer 200 having the RFID tag function includes a capacitor C61 in the land P1 and a capacitor C61 in the land P2 of the RFID reader / writer 100 (see FIGS. 1 and 2) having the RFID tag function according to the first embodiment described above. Capacitors C62 are respectively mounted. As a result, the capacitor C61 is connected in parallel with the coupling capacitor 51 inside the RFID reader / writer module 2, and the capacitor C62 is connected in parallel with the coupling capacitor 52 inside the RFID reader / writer module 2.

  The capacitors C61 and C62 are for adjusting or changing the characteristics of the RFID reader / writer module 2.

  That is, after it is determined that the capacitance values of the coupling capacitors C51 and C52 are insufficient after the RFID reader / writer module 2 is manufactured, by mounting the capacitors C61 and C62 having the insufficient capacitance value, It is possible to adjust the capacitance value to an appropriate value.

  Further, after the RFID reader / writer module 2 is designed and manufactured, if the antenna 7 used in the RFID reader / writer 200 is changed, the capacitors C61 and C62 are mounted, so that the tag function terminals PF1 and It is possible to change the coupling capacitance value between the antennas 7 and obtain appropriate coupling.

  Other configurations of the RFID reader / writer 200 are the same as those of the RFID reader / writer 100 having the RFID tag function according to the first embodiment shown in FIGS. 1 and 2.

1: Mother board 2, 12: RFID reader / writer module 3: Board 4, 14: IC for RFID reader / writer
5: Electronic component 6: Resin 7: Antenna 8: Insulating layer 100, 200: RFID reader / writer C3 having an RFID tag function, C4: Resonance frequency adjusting capacitor C51, C52: Coupling capacitor C61, C62: Capacitor (capacitance) (For adjusting or changing values)
TX1, TX2: Transmission terminal RX: Reception terminal PF1, PF2: RFID tag function terminals T1, T2, T3, T4: External connection terminals

Claims (6)

An RFID reader / writer having an RFID tag function, comprising an RFID reader / writer module and an antenna,
The RFID reader / writer module includes first to fourth external connection terminals,
Wherein the RFID reader-writer module, the IC for RFID reader writer having an RFID tag function is built,
The IC for RFID reader-writer is provided with a first and a second transmission terminal, a reception terminal, and first and second tag function terminal,
Inside the RFID reader / writer module,
The first transmission terminal is connected to the first external connection terminal;
The second transmission terminal is connected to the second external connection terminal;
The first tag function terminal is connected to the first external connection terminal via at least a first coupling capacitor;
The second tag function terminal is connected to the second external connection terminal through at least a second coupling capacitor, and
The first tag function terminal is connected to the third external connection terminal,
The second tag function terminal is connected to the fourth external connection terminal,
The RFID outside the Ridarai data module, said first and second external connection terminal, said antenna is connected, RFID reader-writer with an RFID tag function. Between the connected first transmission terminal and the first external connection terminal,
Between the connected second transmission terminal and the second external connection terminal,
Between the first tag function terminal and the first external connection terminal connected via the first coupling capacitor,
Between the second tag function terminal and the second external connection terminal connected via the second coupling capacitor,
Between the connected first tag function terminal and the third external connection terminal; and
The RFID tag function according to claim 1, wherein a necessary electronic component is further interposed between at least one of the connected second tag function terminal and the fourth external connection terminal. RFID reader / writer equipped. Outside of the RFID Ridarai data module, between the first of said external connection terminals third external connection terminals, and, at least between the second said external connection terminal of the fourth external connection terminal The RFID reader / writer having the RFID tag function according to claim 1, wherein a capacitor for adjusting or changing characteristics is connected to the other. Outside of the RFID Ridarai data module, in parallel with the antenna, RFID reader-writer provided with the capacitor for adjusting the resonance frequency are connected, the RFID tag functionality according to any one of claims 1 to 3 . In the interior of the RFID Ridarai data module, in parallel with the antenna, RFID reader-writer provided with the capacitor for adjusting the resonance frequency are connected, the RFID tag functionality according to any one of claims 1 to 4 . Provided with a first through fourth external connection terminals, IC for R FID writer is built, a R FID writer module with R FID tag function,
The IC for RFID reader-writer is provided with a first and a second transmission terminal, a reception terminal, and first and second tag function terminal,
The first transmission terminal is connected to the first external connection terminal;
The second transmission terminal is connected to the second external connection terminal;
The first tag function terminal is connected to the first external connection terminal via at least a first coupling capacitor;
The second tag function terminal is connected to the second external connection terminal through at least a second coupling capacitor, and
The first tag function terminal is connected to the third external connection terminal,
An R FID reader / writer module having an R FID tag function, wherein the second tag function terminal is connected to the fourth external connection terminal.

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