JP2005134942A - Rfid reader/writer and structure of antenna - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a reader/writer of an RFID system capable of communicating data to a tag irrelevantly to the position relation to the tag and a structure of antenna for the reader/writer. <P>SOLUTION: The antenna 3a for the reader/writer which is formed on a circuit board 4a put in a reader/writer main body 4 comprises a 1st antenna 3a formed on a surface of the circuit board 4a and a 2nd antenna 3b composed of an antenna formed in three dimensions by using conductor patterns 11a and 11b on the top and reverse surfaces of the circuit board 4a and a through hole 11c penetrating the circuit board 4a, a spiral antenna installed on the 1st antenna 3a while parting a loop, an antenna formed by flexing a flexible substrate on the circuit board 4a, an antenna formed in three dimensions by floating a mounted component with lead wires, etc. Consequently, antenna axes are set to a plurality of directions to enable communication irrelevantly to the position relation with the tag. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a reader or reader / writer of an RFID (Radio Frequency Identification) system that performs non-contact data communication using electromagnetic induction or electromagnetic coupling, and more particularly to an antenna structure of the reader or reader / writer.

  In recent years, RFID systems that perform data communication between a tag including an IC chip and a reader or reader / writer (hereinafter collectively referred to as a reader / writer) have become widespread. Since this RFID system communicates data using the antenna provided in each of the tag and the reader / writer, and can communicate even when the tag is separated from the reader / writer, it is used for various applications. Yes.

For example, Patent Document 1 below discloses a technique that uses an RFID system for managing books in a library. According to the above publication, there is provided a delivery management device including a reader / writer for reading a data of an IC chip provided on an object while a tag (band IC seal) including a loop antenna and an IC is attached to a book. By installing the target object on the reader / writer antenna of the delivery management device, the data stored in the IC chip of the target object is read by the reader / writer, and taking out and returning of the book is managed. .
Japanese Patent Laid-Open No. 2002-019922 (page 3-6, FIG. 7)

  In the RFID system having the structure described in the above publication, the reader / writer antenna is fixed to the delivery management device, and the object to which the tag is attached is placed at a predetermined position on the reader / writer antenna. Therefore, data communication between the reader / writer antenna and the tag can be reliably performed. However, in the case of a structure in which a reader / writer is installed on a fixed device, in order to communicate data, the object to which the tag is attached must be carried to the device, for example, placed on a shelf. This is inconvenient when managing existing books.

  Therefore, there is a method in which the reader / writer is formed into a small card shape (for example, a CF card) and mounted on a portable terminal device such as a PDA. In this method, since the reader / writer can be carried around, the tag and data can be communicated without moving the object to which the tag is attached. Because the size of the / writer antenna is also reduced, the range of communication with the tag is narrowed, and data communication may not be possible depending on the positional relationship between the reader / writer antenna and the tag.

  For example, as shown in FIG. 14, the card-like reader / writer 2 is formed on the surface of a reader / writer main body 4 to be mounted in a slot or the like of a portable terminal device and a substrate 4a stored in the main body. The reader / writer antenna 3 is configured so that the antenna coil 7 embedded in the tag 5 and the reader / writer 2 are close to each other so that the antenna axis of the reader / writer antenna 3 faces the same direction (in the figure, under the tag 5 Data communication is possible when the reader / writer 2 is brought close to the side, but the reader / writer 2 is brought close to each other with the antenna axes orthogonal to each other (in the figure, the reader / writer 2 is placed from the left side of the tag 5). Data communication is not possible when close. Therefore, in such a case, the antenna axis may be adjusted by changing the orientation of the mobile terminal device itself. However, if the orientation of the mobile terminal device is changed, it becomes difficult to operate the touch panel or the keyboard, or the monitor becomes difficult to see. This causes a problem that workability is remarkably lowered.

  The present invention has been made in view of the above problems, and a main object of the present invention is a reader / writer and a reader / writer of an RFID system capable of exchanging data with the tag regardless of the positional relationship with the tag. An object of the present invention is to provide an antenna structure.

  In order to achieve the above object, the reader or reader / writer of the present invention is a reader or reader / writer that communicates data with an RFID tag using electromagnetic induction or electromagnetic coupling, and the reader or reader / writer is The circuit element is composed of a main body and an antenna formed on a substrate stored in the main body, and the antenna includes a plurality of antennas having antenna axes in a plurality of directions.

  The reader or reader / writer of the present invention is a reader or reader / writer that communicates data with an RFID tag using electromagnetic induction or electromagnetic coupling, and the reader or reader / writer is composed of circuit elements. And an antenna formed on a substrate stored in the main body, and the antenna includes a loop-shaped first antenna formed of a conductor pattern provided on one surface of the substrate. A second antenna formed three-dimensionally using a conductor pattern provided on the one side surface, a conductor pattern provided on a surface facing the one side surface, and a through-hole penetrating the substrate It is comprised by these.

  The reader or reader / writer of the present invention is a reader or reader / writer that communicates data with an RFID tag using electromagnetic induction or electromagnetic coupling, and the reader or reader / writer is composed of circuit elements. And a antenna formed on a plurality of substrates stored in the main body, the antenna being a loop-shaped first formed by a conductor pattern provided on the surface of any one substrate. And at least a conductor pattern provided on the surface of the one substrate, a conductor pattern provided on the surface of the other substrate, and a joining means for connecting the one substrate and the other substrate. And a second antenna formed three-dimensionally.

  In the present invention, the first antenna and the first antenna are formed separately, and one antenna can be driven by an induced current that flows due to magnetic coupling with the other antenna. .

  The reader or reader / writer of the present invention is a reader or reader / writer that communicates data with an RFID tag using electromagnetic induction or electromagnetic coupling, and the reader or reader / writer is composed of circuit elements. And an antenna formed on a substrate stored in the main body, and the antenna includes a loop-shaped first antenna formed of a conductor pattern provided on one surface of the substrate. And a second antenna having a spiral shape that is arranged on the predetermined wiring of the loop of the first antenna so as to divide the wiring and has an antenna axis in the longitudinal direction of the wiring. is there.

  The reader or reader / writer of the present invention is a reader or reader / writer that communicates data with an RFID tag using electromagnetic induction or electromagnetic coupling, and the reader or reader / writer is composed of circuit elements. And an antenna formed on a substrate stored in the main body, and the antenna includes a loop-shaped first antenna formed of a conductor pattern provided on one surface of the substrate. And a second antenna disposed on the substrate so that the antenna axis faces in a direction substantially parallel to the surface of the substrate by bending a flexible base material on which a conductor pattern is formed. And a resonance circuit including the second antenna is formed separately from the first antenna, and the second antenna is generated by an induced current flowing by magnetic coupling with the first antenna. It can be configured to be dynamic.

  The reader or reader / writer of the present invention is a reader or reader / writer that communicates data with an RFID tag using electromagnetic induction or electromagnetic coupling, and the reader or reader / writer is composed of circuit elements. And an antenna formed on a substrate stored in the main body, and the antenna includes a loop-shaped first antenna formed of a conductor pattern provided on one surface of the substrate. The mounting component is held in a state of being floated from the one side surface by the lead wire, and is formed in three dimensions using the mounting component, the lead wire, and the conductor pattern provided on the one side surface. 2 antennas.

  In the present invention, the reader or reader / writer is preferably formed so that the main body can be mounted in a slot of a mobile terminal device, and data acquired by the antenna is processed by the mobile terminal device.

  As described above, according to the present invention, the reader / writer antenna formed on the substrate stored in the reader / writer main body is three-dimensionally formed on the substrate and the first antenna formed flat on the substrate. Since it is composed of a plurality of antennas including the second antenna, the tag and data can be reliably communicated regardless of the direction of the tag.

  As described above, according to the RFID reader / writer and the reader / writer antenna structure of the present invention, the reader / writer installed in a movable device such as a portable terminal device and the tag attached to the target article Regardless of the positional relationship between the tag and the data, the tag and the data can be reliably communicated.

  The reason is that the reader / writer antenna formed on the substrate stored in the reader / writer main body is added to the first antenna formed in a loop shape on the surface of the substrate, and the conductor pattern on the front and back surfaces of the substrate. An antenna formed three-dimensionally using a through-hole penetrating the substrate and a joining pin connecting a plurality of substrates, a spiral antenna installed so as to divide the loop on the first antenna, and a conductor pattern An antenna formed by bending a flexible base material formed on a substrate, an antenna formed in three dimensions using a lead wire and a conductor pattern on the surface of the substrate, etc. This is because the antenna axis is formed in a plurality of directions by providing the second antenna.

  As shown in the prior art, there is a method for carrying a card-like reader / writer in a portable terminal device such as a PDA. In this case, the size of the reader / writer antenna may be increased. Because the communication range is narrowed, the range of communication is narrowed. Depending on the positional relationship between the reader / writer antenna and the tag, data communication cannot be performed. When the orientation of the mobile terminal device itself is adjusted, the operability and visibility of the mobile terminal device Problem arises.

  Such a problem occurs because the reader / writer antenna is formed on one plane of the substrate stored in the card-like reader / writer main body, and the antenna axis faces one direction. If the reader / writer antenna is formed so that the axis faces a plurality of directions, it is not necessary to adjust the orientation of the mobile terminal device itself. However, there is no reader / writer antenna having antenna axes in a plurality of directions, and it is difficult to integrally form an antenna having antenna axes in a direction parallel to the surface of the substrate. If the reader / writer antenna is formed separately from the substrate, the size of the reader / writer becomes large.

  Therefore, in the present invention, the reader / writer antenna formed on the substrate housed in the reader / writer main body includes a first antenna formed in a loop shape on the surface of the substrate, and a conductor pattern on the front and back surfaces of the substrate. An antenna formed three-dimensionally using a through-hole penetrating the substrate and a joining pin connecting a plurality of substrates, a spiral antenna installed so as to divide the loop on the first antenna, and a conductor pattern An antenna formed by bending a flexible base material formed on a substrate, an antenna formed in three dimensions using a lead wire and a conductor pattern on the surface of the substrate, etc. By configuring with the second antenna, the data can be communicated regardless of the positional relationship with the tag by directing the antenna axis in a plurality of directions. Hereinafter, the specific structure will be described with reference to the drawings.

  First, an RFID reader / writer and its antenna structure according to a first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a diagram schematically showing a configuration of an RFID system according to the present invention, and FIG. 2 is a diagram showing a configuration of a reader / writer and a tag. 3 to 8 are diagrams showing the structure of the reader / writer according to the first embodiment.

  As shown in FIG. 1, an RFID system 1 according to the present invention includes a card-like, stick-like reader / writer main body 4 and a reader having a structure that can be mounted in a slot of a portable terminal device 10 such as a PDA, a notebook personal computer, or a cellular phone. A reader / writer 2 comprising a reader / writer antenna 3 formed on a substrate stored in the writer main body 4 and a card 5, sheet shape, label shape, etc. tag 5 attached to an object. .

  As shown in FIG. 2, the reader / writer body 4 includes a communication circuit unit 4b for converting transmission / reception signals and an arithmetic processing unit 4c for decoding transmission / reception signals. A writer antenna 3 is connected. The arithmetic processing unit 4 c is connected to a circuit of the mobile terminal device 10 and is configured so that data received by the reader / writer antenna 3 can be used by the mobile terminal device 10. The tag 5 includes a resonance circuit 6 including an antenna coil 7 and a capacitor 8 (the capacitor 8 is not always necessary when the IC 9 having an internal capacitance is provided), and generates a signal on the tag 5 side. In this case, an IC 9 for calculating and storing data is connected to the resonance circuit 6 and is driven using a built-in power source or a power source supplied from the reader / writer 2. Then, data communication with the reader / writer antenna 3 is performed by adjusting the resonance frequency of the resonance circuit 6 of the tag 5 to a desired communication frequency (for example, 13.56 MHz).

  The present invention is characterized by the structure of the reader / writer antenna 3 formed on the substrate stored in the reader / writer main body 4. The shape and structure of the reader / writer main body 4 and the tag 5, the reader / writer The type, shape, structure, etc. of the device to which the writer 2 is attached and the object to which the tag 5 is attached are not limited.

  Next, the detailed structure of the reader / writer 2 of this embodiment will be described. As shown in FIG. 3, the reader / writer 2 of the present embodiment is stored in a card / reader / writer main body 4 (for example, CF card shape) that can be mounted in a slot of the mobile terminal device 10 and the main body. The reader / writer antenna 3 is formed integrally with the substrate 4a. The reader / writer antenna 3 is planar on one surface of the substrate 4a (where each conductor pattern intersects the conductor pattern). Loops having antenna axes in a direction substantially perpendicular to the surface of the substrate 4a, including those connected using through holes, jumper wires, etc. so as not to conduct. One antenna 3a and a second antenna 3b which is three-dimensionally formed in the thickness direction of the substrate 4a and has an antenna axis in a direction substantially parallel to the surface of the substrate 4a.

  The substrate 4a on which the reader / writer antenna 3 is formed may be a substrate on which an RF circuit, a control circuit, an interface circuit, or the like for causing the reader / writer 2 to function is formed. Alternatively, it may be a substrate provided for forming an antenna pattern. For ease of explanation, the electrical connection structure between the reader / writer antenna 3 and the circuit elements is not shown in the figure. However, as described above, the reader / writer antenna 3 has the substrate 4a or It is connected to a communication circuit unit 4b formed on another substrate.

  The second antenna 3b includes a conductor pattern (back side conductor pattern 11b in the figure) formed on a surface opposite to a conductor pattern (front side conductor pattern 11a in the figure) formed on one surface of the board 4a and the substrate 4a. Are formed in three dimensions using through holes 11c that pass through the first antenna 3a, and the end portions thereof are connected to the first antenna 3a. By forming the antenna using the through hole 11c in this way, the second antenna having an antenna axis in a direction substantially parallel to the surface of the substrate 4a without increasing the thickness of the reader / writer body 4 (substrate 4a). The antenna 3b can be formed.

  3 is an example, and the second antenna 3b is three-dimensionally formed in the thickness direction of the substrate 4a using the front surface side conductor pattern 11a, the back surface side conductor pattern 11b, and the through hole 11c. The connection position and connection structure of the first antenna 3a and the second antenna 3b are arbitrary, and for example, as shown in FIG. 4, both end portions of the first antenna 3a and the second antenna 3b May be connected, or a connection line between the first antenna 3a and the second antenna 3b may be crossed so that the directions of the magnetic fields face each other. Further, the number of turns of the first antenna 3a is set to 2 and the number of turns of the second antenna 3b is set to 1. However, the number of turns is arbitrary, and the shape of the antenna pattern, the formation position of the through hole, the first The connection position between the first antenna 3a and the second antenna 3b is not limited to the configuration shown in the figure. Further, the thickness of the substrate 4a is not limited, and a commercially available printed circuit board can be used. However, in order to increase the antenna area of the second antenna 3b, the thickness that is as thick as possible can be stored in the reader / writer main body 4. Is preferred. 3 and 4 show the configuration using the substrate 4a having the conductor pattern formed on the front and back surfaces, it is also possible to use a multilayer substrate in which three or more layers of the conductor pattern are formed. The first antenna 3a and the second antenna 3b can be formed using the conductor pattern, or the number of turns of the antenna can be increased using the inner layer surface.

  3 and 4, the first antenna 3a and the second antenna 3b are connected to each other and power is supplied to both. However, the first antenna 3a and the second antenna 3b are separated. You can also. For example, as shown in FIG. 5, a resonance circuit designed to be coupled to the first antenna 3a is formed using the resonance circuit component 12, the conductor patterns 11a and 11b on the front and back surfaces of the substrate 4a, and the through holes 11c. The second antenna 3b can also be formed. In the case of this configuration, the second antenna 3b (parasitic antenna) is driven by an induced current that flows due to magnetic coupling with the first antenna 3a (feed antenna).

  3 to 5, the second antenna 3b is formed so that its antenna axis faces the longitudinal direction of the substrate 4a. For example, as shown in FIG. 6, the antenna axis faces the short direction of the substrate 4a. In this manner, the second antenna 3b may be formed. In FIGS. 3 to 6, the antenna axis of the second antenna 3b is substantially parallel to the surface of the substrate 4a. However, the antenna axis only needs to be different from the antenna axis of the first antenna 3a. Further, in FIG. 3 to FIG. 6, the case where the reader / writer antenna 3 is configured by two types of antennas, the first antenna 3 a and the second antenna 3 b, is described. What is necessary is just to be comprised by the some antenna from which the direction of an antenna axis differs, for example, the feeding antenna shown in FIG. 3 and the parasitic antenna shown in FIG. 5 or FIG. 6 can also be combined.

  3 to 6, the second antenna 3b is three-dimensionally formed on one substrate 4a. However, when there are a plurality of substrates stored in the reader / writer main body 4 (for example, an antenna pattern is formed). In the case where the substrate and the substrate on which the RF circuit, the control circuit, the interface circuit, etc. are formed separately), the conductor pattern formed on the substrate 4a and the substrate 17 are formed as shown in FIG. The second antenna 3b can be formed three-dimensionally in the stacking direction of the substrates 4a and 4b by connecting them using the joining pins 16 that connect between the conductor pattern and the substrate and, if necessary, through holes 11c. . By forming the second antenna 3b using a plurality of substrates in this manner, the area of the antenna can be increased and the range in which data can be communicated can be expanded. Even in this configuration, the connection structure between the first antenna 3a and the second antenna 3b is arbitrary, and any of the structures shown in FIGS. 3 and 4 may be used. Both the second antennas 3b may be fed antennas, and either one may be a parasitic antenna. Further, FIG. 7 shows the case where two substrates 4a and 17 are used, but the three-dimensional second antenna 3b may be formed using three or more substrates.

  Further, in FIGS. 3 to 7, an antenna having an antenna axis substantially parallel or substantially orthogonal to the surface of the substrate 4a is formed, but using the front surface side conductor pattern 11a, the back surface side conductor pattern 11b, and the through hole 11c, An antenna having an antenna axis inclined with respect to the surface of the substrate 4a can also be formed. For example, as shown in FIG. 8, when a U-shaped conductor pattern formed on the front surface side of the substrate 4a and a U-shaped conductor pattern formed on the back surface side of the substrate 4a are connected through a through hole 11c, Since the effective antenna surface is inclined with respect to the surface of the substrate 4a, the antenna axis can be inclined with respect to the normal direction of the substrate 4a. The reader / writer antenna 3 having antenna axes in a plurality of directions can also be formed by using the antenna having such a structure as the first antenna 3a or the second antenna 3b.

  Thus, in addition to the first antenna 3a formed on the surface of the substrate 4a stored in the reader / writer main body 4, the conductor patterns 11a and 11b on both surfaces of the substrate 4a and the through holes 11c penetrating the substrate 4a By forming the second antenna 3b having an antenna axis in a direction other than the direction orthogonal to the surface of the substrate 4a, data communication can be performed regardless of the positional relationship with the tag 5.

  Next, an RFID reader / writer and its antenna structure according to a second embodiment of the present invention will be described with reference to FIGS. 9 and 10 are a perspective view and a plan view showing the structure of the reader / writer according to the second embodiment.

  In the first embodiment described above, the conductor axis 11a, 11b on the front and back surfaces of the substrate 4a and the through hole 11c penetrating the substrate 4a are used to have the second antenna axis other than the direction orthogonal to the surface of the substrate 4a. However, it is also possible to form the second antenna 3b having the antenna axis in the surface direction using only one surface of the substrate 4a.

  Specifically, as shown in FIG. 9, the loop-shaped first antenna 3a is formed on the surface of the substrate 4a stored in the reader / writer main body 4, and a part of the wiring of the first antenna 3a is cut. Then, the second antenna 3b (here, the chip coil 13) having a spiral extending in the longitudinal direction of the wiring is connected thereto. Even in such a configuration, the antenna axis of the loop-shaped first antenna 3a faces in a direction substantially orthogonal to the surface of the substrate 4a, and the antenna axis of the spiral second antenna 3b is substantially parallel to the surface of the substrate 4a. Because it faces the direction, a reader / writer antenna can be configured with a plurality of antennas with different antenna axis directions, and data communication is possible regardless of the positional relationship with the tag 5 as in the first embodiment. It can be.

  Also in this embodiment, the antenna axis of the second antenna 3b may be a direction other than the direction orthogonal to the surface of the substrate 4a, and as shown in FIG. 2 antennas 3b may be arranged, or the structure of FIG. 9 and the structure of FIG. 10 may be combined. Also in the structure of the present embodiment, the first antenna 3a may be formed such that its antenna axis is inclined as shown in FIG. 8, and the second antenna 3b is formed with respect to the surface of the substrate 4a. It may be inclined and fixed. Further, the number of turns, the shape, and the like of the first antenna 3a and the second antenna 3b are arbitrary, and can be appropriately set in consideration of the performance required for the reader / writer 2.

  Next, an RFID reader / writer and its antenna structure according to a third embodiment of the present invention will be described with reference to FIGS. 11 and 12 are a perspective view, a plan view, and a side sectional view showing the structure of the reader / writer according to the third embodiment.

  In the first embodiment described above, the conductor axis 11a, 11b on the front and back surfaces of the substrate 4a and the through hole 11c penetrating the substrate 4a are used to have the second antenna axis other than the direction orthogonal to the surface of the substrate 4a. In this method, the pattern configuration is complicated, and the reader / writer antenna 3 may not be formed using the existing substrate 4a. Therefore, in the present embodiment, the second antenna 3b formed of a flexible material is disposed in the vicinity of the first antenna 3a.

  Specifically, as shown in FIG. 11, a conductive film such as Al or Cu provided on a flexible insulating sheet is removed by etching, or a conductive paste is applied on the insulating sheet by screen printing. The flexible substrate 14 formed by the above is bent and disposed on the substrate 4a so that its antenna axis faces in a direction substantially parallel to the surface of the substrate 4a (in the figure, it faces the longitudinal direction of the substrate 4a). 3b is formed, and the second antenna 3b and the first antenna 3a are connected by a method such as pressure bonding or soldering. Even in such a configuration, the antenna axis of the loop-shaped first antenna 3a is oriented in a direction substantially orthogonal to the surface of the substrate 4a, and the antenna axis of the second antenna 3b formed by bending the flexible substrate 14 is the substrate 4a. The reader / writer antenna 3 can be composed of a plurality of antennas having different antenna axis directions, and the tag 5 is connected to the tag 5 in the same manner as in the first and second embodiments. Data can be exchanged regardless of the positional relationship.

  In FIG. 11, the flexible substrate 14 is bent in a loop shape and installed on the substrate 4a. However, a conductor pattern connected to the antenna pattern of the flexible substrate 14 is formed on the substrate 4a in advance, and the semicircular shape is formed. You may make it connect the both ends of the flexible substrate 14 to the board | substrate 4a.

  Further, in FIG. 11, the first antenna 3a and the second antenna 3b are connected to supply power to both antennas. However, as shown in FIG. A resonant circuit to be coupled may be formed, and the flexible substrate 14 may be wound in a loop shape and installed in the vicinity of the first antenna 3a. The second antenna 3b may be connected to the first antenna 3a. It can also be driven by an induced current that flows due to the magnetic coupling. In this configuration, since the second antenna 3b formed of the flexible substrate 14 need only be disposed on the substrate 4a on which the first antenna 3a is formed, the existing substrate 4a on which the first antenna 3a is formed is arranged. There is an advantage that it can be used as it is. Further, when the flexible substrate 14 is used, when the substrate 4a is stored in the housing, the flexible substrate 14 is deformed so as to match the internal shape of the housing to some extent, so that the maximum antenna area in the housing is ensured. There is also an advantage that you can.

  Also in the present embodiment, the second antenna 3b may be formed so that the antenna axis is directed in the short direction of the substrate 4a, and the antenna axis of the first antenna 3a is inclined as shown in FIG. Alternatively, the second antenna 3b may be fixed while being inclined with respect to the surface of the substrate 4a. Further, the number of turns and shape of the first antenna 3a, the material of the flexible substrate 14, the pattern shape, the bent shape, the installation position, and the like are arbitrary, and can be appropriately set in consideration of the performance required for the reader / writer 2. it can.

  Next, an RFID reader / writer and an antenna structure thereof according to a fourth embodiment of the present invention will be described with reference to FIG. FIG. 13 is a perspective view, a plan view, and a side sectional view showing the structure of the reader / writer according to the fourth embodiment.

  In the second embodiment described above, the second antenna 3b is formed using the resonance circuit component 12 constituting the resonance circuit, the conductor patterns 11a and 11b on the front and back surfaces of the substrate 4a, and the through holes 11c penetrating the substrate 4a. However, the second antenna 3b having the antenna axis in the surface direction of the substrate 4a can be formed in three dimensions without using the through hole 11c.

  Specifically, as shown in FIG. 13, a mounting component 15 (a component electrically connected to the first antenna 3a or a component constituting a parasitic antenna may be mounted on the substrate 4a. For example, the legs 15a of a low resistance lead resistance or a lead capacitor having a capacity necessary for resonance are bent and mounted so that a gap is formed between the legs 15a. Even in such a configuration, a loop is formed by the foot 15a of the mounting component 15 and the conductor pattern (here, the surface-side conductor pattern 11a) formed on the surface of the substrate 4a, and the loop functions as the second antenna 3b. Therefore, the reader / writer antenna 3 can be configured by a plurality of antennas having different antenna axis directions.

  In FIG. 13, the foot 15a of the mounting component 15 is connected to the front surface side conductor pattern 11a of the substrate 4a. However, the foot 15a of the mounting component 15 is connected to the back surface side conductor pattern 11b through the through hole 11c. May be. Also in this embodiment, the mounting antenna 15 may be arranged so that the antenna axis faces the short direction of the substrate 4a to form the second antenna 3b, or the first antenna 3a is shown in FIG. As described above, the antenna axis may be inclined or the second antenna 3b may be fixed while being inclined with respect to the surface of the substrate 4a. Further, the number of turns, the shape of the first antenna 3a, the type of the mounting component 15, the shape of the foot 15a, the size of the gap with the substrate 4a, etc. are arbitrary, taking into consideration the performance required of the reader / writer 2 It can be set appropriately. It is also possible to increase the number of turns of the second antenna 3b depending on the number of parts. For example, when an antenna is formed with a 100 pF capacitor, a two-turn coil can be obtained by connecting two 200 pF capacitors in series. An antenna can be formed.

  Further, in each of the above embodiments, four structures for forming the second antenna 3b having the antenna axis in a direction other than the direction orthogonal to the surface of the substrate 4a are described, but these structures may be used alone. It is also possible to use a combination of a plurality of structures. In the above description, the antenna structure of the present invention is applied to the reader / writer antenna. However, the present invention is not limited to the above-described embodiments. The same applies to.

It is a figure which shows typically the structure of the RFID system which concerns on this invention. It is a figure which shows the structure of the reader / writer and tag which concern on this invention. It is a figure which shows the structure of the reader / writer based on 1st Example of this invention. It is a figure which shows the variation of the structure of the reader / writer based on 1st Example of this invention. It is a figure which shows the variation of the structure of the reader / writer based on 1st Example of this invention. It is a figure which shows the variation of the structure of the reader / writer based on 1st Example of this invention. It is a figure which shows the variation of the structure of the reader / writer based on 1st Example of this invention. It is a figure which shows the variation of the structure of the reader / writer based on 1st Example of this invention. It is a figure which shows the structure of the reader / writer based on 2nd Example of this invention. It is a figure which shows the variation of the structure of the reader / writer based on 2nd Example of this invention. It is a figure which shows the structure of the reader / writer based on 3rd Example of this invention. It is a figure which shows the variation of the structure of the reader / writer based on 3rd Example of this invention. It is a figure which shows the structure of the reader / writer based on the 4th Example of this invention. It is a figure which shows the structure of the conventional RFID system typically.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 RFID system 2 Reader / writer 3 Reader / writer antenna 3a 1st antenna 3b 2nd antenna 4 Reader / writer main body 4a Substrate 4b Communication circuit unit 4c Arithmetic processing unit 5 Tag 6 Resonance circuit 7 Antenna coil 8 Capacitor 9 IC
DESCRIPTION OF SYMBOLS 10 Portable terminal device 11a Front surface side conductor pattern 11b Back surface side conductor pattern 11c Through hole 12 Resonant circuit component 13 Chip capacitor 14 Flexible substrate 15 Mounting component 15a Foot 16 Joint pin 17 Substrate

Claims (9)

A reader or reader / writer that communicates data with an RFID tag using electromagnetic induction or electromagnetic coupling,
The reader or reader / writer includes a main body in which circuit elements are formed and an antenna formed on a substrate stored in the main body.
A reader or a reader / writer, wherein the antenna includes a plurality of antennas having antenna axes in a plurality of directions. A reader or reader / writer that communicates data with an RFID tag using electromagnetic induction or electromagnetic coupling,
The reader or reader / writer includes a main body in which circuit elements are formed and an antenna formed on a substrate stored in the main body.
The antenna is opposed to the loop-shaped first antenna formed of a conductor pattern provided on one surface of the substrate and the conductor pattern provided on the one surface. A reader or a reader / writer comprising a conductive pattern provided on a surface and a second antenna formed three-dimensionally using a through hole penetrating the substrate. A reader or reader / writer that communicates data with an RFID tag using electromagnetic induction or electromagnetic coupling,
The reader or reader / writer is composed of a main body in which circuit elements are formed and an antenna formed on a plurality of substrates stored in the main body,
The antenna includes a loop-shaped first antenna formed of a conductor pattern provided on a surface of any one substrate, a conductor pattern provided on the surface of the one substrate, and a surface of another substrate. A reader comprising a conductor pattern provided on the second antenna and a second antenna formed in three dimensions using at least a joining means for connecting the one substrate and the other substrate; or Reader / writer.   The said 1st antenna and the said 1st antenna are formed separately, and one antenna is driven by the induced current which flows by magnetic coupling with the other antenna. The reader or reader / writer described. A reader or reader / writer that communicates data with an RFID tag using electromagnetic induction or electromagnetic coupling,
The reader or reader / writer includes a main body in which circuit elements are formed and an antenna formed on a substrate stored in the main body.
The antenna is divided into a loop-shaped first antenna formed of a conductor pattern provided on one surface of the substrate and a predetermined wiring of the loop of the first antenna. A reader or a reader / writer characterized in that it is configured by a spiral second antenna having an antenna axis in the longitudinal direction of the wiring. A reader or reader / writer that communicates data with an RFID tag using electromagnetic induction or electromagnetic coupling,
The reader or reader / writer includes a main body in which circuit elements are formed and an antenna formed on a substrate stored in the main body.
The antenna is formed by bending a loop-shaped first antenna formed of a conductor pattern provided on one surface of the substrate and a flexible base material on which the conductor pattern is formed. A reader or a reader / writer comprising: a second antenna disposed on the substrate so that the antenna axis is oriented in a direction substantially parallel to the surface of the substrate.   A resonant circuit including the second antenna is formed separately from the first antenna, and the second antenna is driven by an induced current that flows due to magnetic coupling with the first antenna. The reader or reader / writer according to claim 6. A reader or reader / writer that communicates data with an RFID tag using electromagnetic induction or electromagnetic coupling,
The reader or reader / writer is composed of a main body and an antenna formed on a substrate stored in the main body.
The antenna has a loop-shaped first antenna formed of a conductor pattern provided on one surface of the substrate, and a mounting component is held in a state of being floated from the one surface by a lead wire, A reader or a reader / writer comprising a mounting component, the lead wire, and a second antenna formed three-dimensionally using a conductor pattern provided on the one side surface.   9. The reader or reader / writer is formed so that the main body can be mounted in a slot of a mobile terminal device, and data acquired by the antenna is processed by the mobile terminal device. The reader or reader / writer according to any one of the above.

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