WO2004097725A1 - 通信装置及び無線タグリーダー/ライター - Google Patents
通信装置及び無線タグリーダー/ライター Download PDFInfo
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- WO2004097725A1 WO2004097725A1 PCT/JP2004/004135 JP2004004135W WO2004097725A1 WO 2004097725 A1 WO2004097725 A1 WO 2004097725A1 JP 2004004135 W JP2004004135 W JP 2004004135W WO 2004097725 A1 WO2004097725 A1 WO 2004097725A1
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- Prior art keywords
- antenna
- information
- communication
- head
- communication device
- Prior art date
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- 238000004891 communication Methods 0.000 title claims abstract description 159
- 230000005674 electromagnetic induction Effects 0.000 claims abstract description 42
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Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B5/00—Near-field transmission systems, e.g. inductive or capacitive transmission systems
- H04B5/70—Near-field transmission systems, e.g. inductive or capacitive transmission systems specially adapted for specific purposes
- H04B5/77—Near-field transmission systems, e.g. inductive or capacitive transmission systems specially adapted for specific purposes for interrogation
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K19/00—Record carriers for use with machines and with at least a part designed to carry digital markings
- G06K19/06—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
- G06K19/067—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components
- G06K19/07—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips
- G06K19/0723—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips the record carrier comprising an arrangement for non-contact communication, e.g. wireless communication circuits on transponder cards, non-contact smart cards or RFIDs
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K19/00—Record carriers for use with machines and with at least a part designed to carry digital markings
- G06K19/06—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
- G06K19/067—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components
- G06K19/07—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips
- G06K19/077—Constructional details, e.g. mounting of circuits in the carrier
- G06K19/07749—Constructional details, e.g. mounting of circuits in the carrier the record carrier being capable of non-contact communication, e.g. constructional details of the antenna of a non-contact smart card
- G06K19/07773—Antenna details
- G06K19/07777—Antenna details the antenna being of the inductive type
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
- G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
- G06K7/10009—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves
- G06K7/10316—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves using at least one antenna particularly designed for interrogating the wireless record carriers
- G06K7/10336—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves using at least one antenna particularly designed for interrogating the wireless record carriers the antenna being of the near field type, inductive coil
Definitions
- the present invention relates to a communication device and / or a wireless tag reader / writer that performs at least one of transmitting information to a transponder having an antenna and receiving information transmitted from the transponder.
- An RFID (Radio Frequency Identification) system in which a reader reads information from a small wireless tag (transponder) storing predetermined information in a non-contact manner. Even if the tag is dirty or placed in an invisible position, the RFID system can read the information of the wireless tag by wireless communication with the reader. It is attracting attention in various fields such as inspection and inspection processes. In particular, in the RFID system using the UHF (Ultra High Frequency) band, communication between the wireless tag and the reader can be extended, so that it can be applied to various systems.
- UHF Ultra High Frequency
- Fig. 11 shows an external view of the conventional transmitter that transmits information to a wireless tag by electromagnetic induction.
- the transmitter 100 includes a communication coil 101, an oscillator 102, a modulator 103, and an amplifier 104.
- the wireless tag 110 includes a closed loop antenna 111 wound multiple times and a communication chip 112.
- Communication chips 1 1 and 2 are IC chips dedicated to communication with a demodulator and memory. As shown in FIG. 11, the wireless tag 110 is arranged such that the loop plane of the antenna 111 and the loop plane of the communication coil i 01 of the transmitter 100 are parallel to each other.
- the transmitter 100 oscillates a carrier by the oscillator 102, modulates the oscillated carrier by the modulator 103 based on predetermined information (D ata), and amplifies the modulated carrier by the amplifier 100.
- the communication coil 101 generates a magnetic flux based on the input carrier.
- a current flows through the antenna 111 and a signal is formed.
- the signal formed on the antenna 111 is demodulated as information by the demodulator of the communication chip 112 and then stored in the memory.
- the magnetic flux radiates from the communication coil 101 to the antenna 111. Will occur.
- To increase the efficiency of communication by electromagnetic induction it is necessary to pass a large amount of magnetic flux inside the loop of the antenna 111. In this case, it is sufficient to increase the sensitivity by enlarging the loop shape of the antenna 1 1 1 .
- the antenna with sensitivity in the UHF band has low sensitivity in the low frequency band, when using the signal in the low frequency band Therefore, it is necessary to further increase the sensitivity of the antenna by forming the loops of the antennas 111 so as to overlap one another. Power, then, that In such an antenna, the resonance frequency is lowered and the sensitivity in the UHF band is reduced.
- another magnetic element arranged near the transmitter 110 is required. Information may be transmitted to the wireless tag 110 as well.
- the present invention provides efficient communication in a non-contact manner with an antenna by electromagnetic induction without lowering the sensitivity in the resonance frequency band of a wireless antenna capable of communication in the UHF band or the microwave band. It is intended to provide a communication device and a wireless tag reader / writer in which magnetic flux can be suitably prevented from leaking to the surroundings. Disclosure of the invention
- the communication device wherein at least one of transmission of information to a transponder having an antenna and reception of information transmitted from the transponder, communication with the antenna by electromagnetic induction is performed.
- a head for performing communication by contact wherein the head includes at least one magnetic body constituting an air gap and at least one coil wound around the magnetic body; It is characterized by.
- the shape of the magnetic body is C-shaped, it is possible to easily manufacture the magnetic body having a gap and wind the coil around the magnetic body, and to simplify the head. be able to. In addition, there is little child that leaks out the emitted magnetic flux. Also, the transponder can be transported to the gap. 4.
- the coils connected in series or in parallel can generate a magnetic field having the same phase in each magnetic material.
- the living body can be separated according to the space. In addition, it can flexibly cope with the antenna shape and the arrangement of the communication chip on the tag.
- the communication device wherein the area of a plane through which the magnetic flux from one end to the other of the magnetic material penetrates, that is, the cross-sectional area of the magnetic flux, is small, so that the antenna can be downsized.
- the antenna is characterized in that it is formed in a closed loop.
- the antenna is easily configured. .
- a strong magnetic field is generated even for an antenna through which induced current does not easily flow, and communication can be performed between the head and the transponder by electromagnetic induction by concentrating the magnetic flux.
- the antenna is simpler and less expensive.
- the communication device according to claim 7, wherein an area of an end portion of the magnetic body facing the gap, that is, an area of the end surface is set to be smaller than an area of a closed loop formed by the antenna.
- the communication device is for detecting that ⁇ facing the gap of the magnetic substance is contained in a closed loop formed by the antenna when viewed from a direction perpendicular to the plane.
- the head detects that the ⁇ 3 ⁇ 4 portion facing the air gap of the magnetic material is contained in a closed loop formed in the antenna, the head detects that The antenna is communicated with the antenna by electromagnetic induction.
- the communication device further comprising at least two heads, one of the two heads transmitting information to the transponder, and the other being A head receives information from the transponder.
- the circuit configuration of the communication device can be simplified. In addition, it is possible to check the written contents easily and quickly.
- the communication device wherein the head communicates with the antenna configured to resonate at a frequency higher than the UHF band by electromagnetic induction using a frequency lower than the HF band.
- a wireless reader / writer wherein the information storage of a wireless tag including a communication IC having an information storage unit for storing information and an antenna connected to the communication IC.
- a wireless tag reader / writer for reading and / or writing information from / to a unit, wherein the communication device according to any one of claims 1 to 11, and the antenna traverses in or near the gap.
- a transport mechanism for transporting the wireless tag so as to cut and pass the wireless tag.
- the wireless evening reader / writer is a device that writes information to a wireless tag by communicating with a transponder of the wireless evening (a writer), and a device that reads information to a wireless tag.
- a writer a transponder of the wireless evening
- This is a concept that includes at least one of a reader (reader) and a device (reader-writer) that both writes and reads information to and from a wireless tag.
- a wireless tag reader / writer wherein the information storage of a wireless tag including a communication IC having an information storage unit for storing information and an antenna connected to the communication IC.
- a wireless tag reader / writer for reading and / or writing information from / to a unit comprising: the communication device according to claim 9; and the gap of the magnetic body when viewed from a direction perpendicular to the plane. And a transport mechanism for transporting the wireless tag so that an end facing the wireless tag passes through a position within a closed loop formed by the antenna.
- FIG. 1 is a block diagram illustrating a configuration of an RFID tag writer according to the first embodiment of the present invention.
- FIG. 2 is a diagram showing a configuration of an RFID tag in which information is read or written by the RFID tag writer shown in FIG.
- FIG. 3 is a transparent view showing a transport path of the RFID tag shown in FIG.
- FIG. 4 is a block diagram showing a circuit configuration of the communication unit shown in FIG.
- FIG. 5 is a block diagram showing a circuit configuration of the transponder shown in FIG.
- FIG. 6 is an external view showing a communication state between the communication unit shown in FIG. 1 and the transponder shown in FIG.
- FIG. 7 is an external view of a head included in an RFID tag writer according to the second embodiment of the present invention.
- FIG. 8 is a block diagram showing a circuit configuration of a communication unit included in the RFID tag writer according to the third embodiment of the present invention.
- FIG. 9 is an external view showing a communication state between a communication unit and a transponder according to the third embodiment of the present invention.
- FIG. 10 shows a modification of the antenna of the transponder shown in FIG.
- FIG. 11 is an external view showing a communication state by electromagnetic induction between a transmitter and a wireless tag according to the related art.
- FIG. 1 is a block diagram showing the configuration of the RF ID tag writer 11.
- the RF ID tag writer 1 carries out printing on the RF ID tag 50 and writes information while transporting an RF ID tag 50, which will be described later, which is an information carrier attached to an article or the like in the RF ID system. Is what you do.
- the user obtains the required RF I'D tag 50 on the spot and easily by inputting the print content to be applied to the desired ID tag 50 and the information to be stored in the RF ID tag 50. Can be.
- the contents of the print contents and the write information are not limited to those input by the user.
- the contents may be obtained from a database that can be referred to via a network, or may be other information. It may be obtained via a storage medium. As shown in FIG.
- the RF ID tag writer 11 includes a print transport unit 2 and a communication unit 10.
- the print transport unit 2 prints the print information input by the user on the RF ID tag 50 while sequentially transporting the RF ID tag 50.
- the communication section 10 communicates with the RF ID tag 50 to write information into the RF ID tag 50 in a non-contact manner.
- FIG. 2 is a diagram showing the configuration of the RF ID tag 50
- FIG. 2 (a) is a transmission diagram from the top of the RF ID tag 50
- FIG. 2 (b) is FIG. 2 (a) of the RF ID tag 50.
- 1 is a cross-sectional view taken along line A-A in FIG.
- the RF ID tag 50 As shown in FIGS. 2 (a) and 2 (b), the RF ID tag 50
- the transponder 51 is composed of, for example, one turn of one electric wire, that is, a single-wire antenna '52 and a communication chip.
- a carrier wave transmitted from a reader (not shown) of an RF ID system is received from an antenna 52, modulated based on predetermined information, and returned as a reflected wave.
- RF ID tags created with this device are usually The UHF band and microwave band are used for communication with Daichi.
- the antenna 52 has its circuit constant set to be the same as the predetermined frequency used as the carrier frequency in the UHF band or microwave band transmitted from the reader 1, and the folded dipole It functions as an antenna, and the closed ends are formed by connecting the rain ends of the electric wires or the electric circuit made of a conductive material to the communication chip 53, respectively.
- the evening member 60 is a flat or flat tape-like member for enclosing the transponder 51, and includes a base film 61, a transponder support film 63, a release paper 65, and force. It is configured by laminating films 66.
- the base film 61 is a colored resin film serving as a base of the tag member 60, and determines the base color of the tag member 60.
- the base film 61 has an adhesive layer 62 on the upper surface side.
- the transponder support film 63 is a film for supporting the transponder 51.
- the transponder support film 63 has its upper surface fixed to the rear surface of the base film 61, and the transponder 51 is supported on the rear surface.
- the transponder support film 63 has an adhesive layer 64 so as to cover the transponder 51 supported on the back side.
- the release paper 65 covers the adhesive layer 64 of the transponder support film 63.
- the cover film 66 is a transparent resin member, constitutes a surface layer of the evening member 60, covers one surface thereof, and displays the print contents 67 applied by the print transport unit 2.
- the force bar film 66 is printed on the back side of the print transport unit 2 and then adhered to the adhesive layer 62 on the upper surface side of the base film 61. Since the loop antenna 52 of the transponder 51 is adhered and supported on the back side of the transponder support film 63 as described above, the loop antenna 52 is attached to the tag member 60, that is, the surface of the RFID tag 50. It is looped in a plane along it.
- FIG. 2 is a transparent view showing a transport path of an RFID tag 50 in a writer 1;
- the RFID tag writer 1 is detachably mounted in a power supply / notch mounting portion 80 and its cassette mounting portion 80, and the RFID tag 50 is stored therein.
- a cassette 70, a position sensor 83, and a communication unit 10 are provided.
- the communication part 10 is a part that functions as a communication device of the RFID tag reader / writer 11, and has a head 11 for communicating with the antenna 52 of the transponder 51 by electric conduction, and a head thereof.
- the print transport unit 2 described above includes a print head 81 for printing predetermined characters on the RFID tag 50, a transport roller 75, a pressure roller 76, and guide rollers 7a to 7a. 7 e and an outlet 82 for unloading the printed RFID tag 50.
- the printing head 81 is for printing on the cover film 66 by thermally transferring the ink of an ink ribbon 68 described later, and is provided on the main body of the RFID tag device 11.
- the carry-out port 82 is an opening for carrying out the RFID tag 50 to the outside.
- the position sensor 83 is a reflection-type photosensor arranged near the downstream side of the communication unit 10, and based on a mark (not shown) pre-printed on the release paper 65 of the tag member 60, the RFID tag 50. This is for detecting the position of the antenna 52. By using the position sensor 83, it is possible to detect the timing of writing information to the RFID tag 50 by the communication unit 10 and the timing of cutting the tag # 5 material 60.
- the RFID tags 50 are stored in a state of being continuously arranged in a tape shape.
- the type is determined by the type of the stored RFID tag 50. By exchanging the cassette 70, the RFID tag writer 11 can print and write information on the RFID tag 50 of various shapes.
- a communication unit 10 is provided in the vicinity of the carry-out port 82.
- the communication unit 10 communicates with the RFID tag 50 to be carried out to write necessary information to the RFID tag 50 or read information.
- the position sensor 83 may be a metal detection type sensor.
- Cassette 70 is the first sp
- the cassette 70 includes a print head 81 for printing on the cover film provided in the cassette mounting section 80 when the cassette # 0 is mounted on the cassette mounting section 80. It further includes a hollow portion 78 for insertion and placement in 70. '
- the first spool 71 has an RFID tag 69 (see FIG. 2 (b)) before the power film 66 is pasted, wound in a tape shape.
- the second spool 72 has a cover film 66 wound thereon.
- the third spool 73 has an ink ribbon 68 wound thereon.
- the fourth spool 74 has an ink ribbon 68 wound around the third spool wound from the opposite end of the ink ribbon 68 connected to the third spool.
- the transport roller 75 is for transporting the RFID tag 50 to the outlet 82.
- the transport roller 75 forms a rotational driving force transmission path with an output shaft of a transport motor (not shown) provided in the cassette mounting portion 80. It is arranged to be.
- the pressing roller 76 presses the RFID tag 69 and the cover film 66 except for the cover—the film 66 between the conveying roller 75 and presses the shell together to convey the shell, and conveys it. It is located very close.
- the guide roller 77 a guides the RFID tag 69 except the cover film 66 wound on the first spool between the transport roller 75 and the press roller 76.
- the guide rollers 77 b and 77 c guide the cover film 66 wound around the second spooler to the printing head 81.
- the guide roller 77d guides the ink ribbon 68 wound around the third spooler to the print head 81.
- the guide rollers 7 7 e guide the cover film 6 6 guided to the printing head 8 1 between the transport roller 7 5 and the pressure roller 76, and the ink guided to the printing head 8 1.
- the ribbon 68 is guided to the fourth spool 74.
- the RFID tags 69 excluding the cover film 66 are transported in a four-dog state pressed between the transport roller 75 driven by the transport motor via a rotational driving force transmission path and the pressure contactor 6. It is conveyed toward exit 82. As a result, the RFI 'D tag 69 except for the cover film 66 wound on the first spool 71 is unwound from the first spool 71, and guided by the guide roller 7a to carry the transport roller 7 5 and between the pressing rollers 76.
- the cover film 66 wound on the second spool 72 is unwound from the second spool 72, and is guided by the guide rollers 77b and 77c to print the print head 8. Reach one.
- the fourth spool 74 is driven to rotate at the same time, the ink ribbon 68 wound around the third spool 73 is unwound from the third spool 73 and guided to the guide roller 77d.
- the print head 81 is reached.
- the cover film 66 and the ink ribbon 68 arrive at the print head 81, the ink 67 of the ink ribbon 68 is transferred to the cover film 66 by the heat from the print head 81, and the cover is covered.
- a desired image is printed on one film 66.
- the printed cover film 66 is further guided by guide rollers 77 e and reaches between the transport roller 75 and the press roller 76.
- the ink ribbon 68 is further guided by a guide roller 77 e and wound around a fourth spool 74 to be collected.
- the RFID tag 69 excluding the cover film 66 that has reached between the transport roller 75 and the pressure roller 76 and the cover film 66 printed by the print head 81 are transport rollers 75. By being pressed into contact with the pressing roller 76, they are bonded together.
- the RFID tag 50 to which the cover film 66 is attached is conveyed to a later-described head 11 of the communication unit 10 disposed near the carry-out port 82.
- the RFID tag 50 conveyed to the head 11 is written with information by communication with the communication unit 10, and the written information is read, and the written information and the read information are read. It is confirmed whether or not it is. If the written information matches the read information, the RFID tag 50 is carried out of the RFID tag writer 1 from the carry-out port 82.
- the FID tag 50 is used by being sequentially cut for each preset length.
- the transport mechanism composed of the transport roller 75 and the pressure roller 76 is such that the RFID tag 50 crosses the gap 30 provided in the core 13 of the head 11.
- the RFID tag 50 is conveyed so as to pass through and pass through a position in which the end of the core 13 falls within the closed loop of the antenna 5.2 in the RFID tag 50.
- FIG. 4 is a block diagram showing the circuit configuration of the communication unit 10 of the RFID unit 1
- FIG. 5 is a block diagram showing the circuit configuration of the transponder 51
- FIG. 6 is a block diagram of the communication unit 10. 6 is a perspective view showing a state of communication with the device 51.
- FIG. 4 is a block diagram showing the circuit configuration of the communication unit 10 of the RFID unit 1
- FIG. 5 is a block diagram showing the circuit configuration of the transponder 51
- FIG. 6 is a block diagram of the communication unit 10. 6 is a perspective view showing a state of communication with the device 51.
- the communication unit 10 includes a head 11 and a controller 12.
- the head 11 is for communicating with the antenna 52 of the transponder 51 by electromagnetic induction, and includes a core 13 and a coil 14.
- the core 13 is a magnetic material having a magnetic permeability sufficiently higher than at least air, such as a fluoride, and has a size slightly larger than the thickness of the RFID tag 50 for allowing the RFID tag 50 to pass therethrough. It has a C-shape having three voids 30. Further, both ends 30a and 30b of the core 13 facing the gap 30 are tapered or tapered so that the cross-sectional area decreases toward the tip.
- the area along the loop plane of the antenna 52 at both ends facing, that is, the area of a pair of end faces of the core 13 facing each other via the gap 30 is made smaller than the area of the closed loop formed by the antenna 52. ing.
- the coil 14 is formed by winding an electric wire around a core 13 and connected to a controller 18 of a controller 12 described later.
- the communication between the antenna 5 2 of the transponder 5 1 and the head 11 1 by the electromagnetic induction acts when the area of both ends of the core 13 is viewed from the loop plane of the antenna 5, that is, the direction perpendicular to the RFID tag 50. This operation is performed in a state where the antenna 52 is within a closed loop formed in the antenna 52, that is, a state where the antenna 52 is in a closed loop.
- the magnetic flux radiated from one end of the core 13 to the other end and penetrating through the loop of the antenna 5 is changed.
- an induced current flows through the antenna 52 to generate a signal.
- the coil 14 functions as a primary coil and the antenna 52 functions as a secondary coil.
- the magnetic field generated in the loop of the antenna 52 and penetrating the coil 14 through the core 13 is changed, so that the coil An induced current flows through 14 to generate a signal.
- the antenna 52 functions as a primary coil and the coil 1'4 functions as a secondary coil.
- the signal generated in coil i 4 is output to coupling circuit 18.
- the controller I2 controls communication between the RFID tag writer 11 and the transponder 51, and includes a carrier generation unit 15, a carrier modulation unit 16, a carrier amplification unit 17, a coupling circuit 18, It has an LNA (Low Noise Amp) 19, a band-pass filter 20 and a demodulator 21.
- the carrier generation unit 15 generates a carrier in response to a trigger signal input based on the position sensor 83, and outputs the generated carrier to the carrier modulation unit 16.
- the frequency of the carrier wave can be set arbitrarily, a frequency in a range where the core 13 exhibits sufficient magnetic characteristics, particularly a frequency below the HF band is desirable, and is set to, for example, 13 MHz.
- the carrier modulation section 16 performs amplitude modulation (ASK) on the carrier generated by the carrier generation section 15 based on input data, and outputs the modulated carrier to the carrier amplification section 17. It is.
- the carrier amplification unit 17 amplifies the carrier modulated by the carrier modulation unit 16 and outputs the amplified carrier to the coupling circuit 18.
- the coupling circuit 18 outputs the carrier wave amplified by the carrier wave amplification unit 17 to the coil 14 or converts the reflected wave containing the information signal from the transponder 51 input from the coil 14 to the LNA 19 Is output to
- LNA 19 amplifies the reflected wave input from coupling circuit 18, and outputs the amplified carrier to bandpass filter 20.
- the band-pass filter 20 is a well-known LC filter, and outputs an output signal thereof to the demodulation unit 21.
- the demodulation unit I1 demodulates the signal input by the bandpass filter 20, generates an information signal from the transponder 51, and outputs it as output data. .
- transponder 5 1 Has an antenna 52 and a communication chip 53.
- the antenna 52 is attached to the transponder support film 63 laminated on the base film 61, and has a planar loop shape, and both ends are connected to the communication chip 52.
- the communication chip 53 is a communication IC chip and includes a modulation / demodulation unit 54, an information acquisition unit 55, a storage unit 56, and an information generation unit 57, and is connected to the antenna 52.
- the modulation / demodulation unit 54 demodulates the carrier received by the antenna 52 and outputs the demodulated signal to the information acquisition unit 55.Also, the modulation / demodulation unit 54 outputs the reflected wave of the carrier received by the antenna 52 to the information generation unit 5. Modulation is performed based on the information to be returned input from step 7.
- the information acquisition unit 55 acquires information from the signal demodulated by the modulation / demodulation unit 54, and stores the information in the storage unit 56 based on the acquired information. Specifically, when the information acquired by the information acquisition unit 55 includes a command to write information to the transponder 51 and information to be written, the information to be written Is stored in the storage unit 56.
- the information acquired by the information acquiring unit 55 includes another command such as a command to read information from the transponder 51, no information is stored in the storage unit 56.
- the storage unit 56 stores information to be returned by the transponder 51.
- the storage unit 56 stores information according to a command from the information acquisition unit 55, and the stored information is read out by the information generation unit 57.
- the information generating section 57 reads out the information stored in the storage section 56 to generate information to be returned, and outputs the generated information to be returned to the modem section 54.
- FIG. 6 communication by electromagnetic induction between the communication unit 10 and the transponder 51 is performed when the both ends of the core 13 are viewed from the direction perpendicular to the loop plane of the antenna 52. This is performed in a state where the RFID tag 50 has been transported so as to be contained in the closed loop formed in FIG.
- whether the RFID tag 50 has been transported to a position where the tip of the core 13 falls within the closed loop formed in the antenna 52 is determined in advance by the RFID tag 50.
- the mark provided on the back surface is detected by the position sensor 83.
- the position sensor 83 allows the tip of the core 13 to be in a closed state formed in the antenna 52 when viewed from a direction perpendicular to the loop plane of the antenna 52.
- a trigger signal is output to the carrier generator 15.
- the carrier generator 15 generates a carrier when a trigger signal is input.
- the carrier generated by the carrier generator 15 is output to the carrier modulator 16 and modulated by the carrier modulator 16 based on the input data.
- the input data includes a command for the transponder 51 and additional information. For example, when writing information to the transponder 51, a command to write information and information to be written are input data.
- the carrier modulated by the carrier modulator 16 is output to the carrier amplifier 17, amplified in the carrier amplifier 17, and output to the coil 14 of the head 11 via the coupling circuit 18. Is forced. Thereby, the magnetic flux radiated from one end of the core 13 to the other end and passing through the loop of the antenna 52 is changed based on the carrier signal input to the coil 14. Then, an induced current is caused to flow through the antenna 52 to generate a carrier signal.
- the transponder 51 receives the carrier generated in the antenna 52 by the electromagnetic induction.
- the carrier received by antenna 52 is output to modulation / demodulation section 54 and demodulated, and output to information acquisition section 55.
- the information acquisition unit 55 acquires information included in the signal input from the modulation / demodulation unit 54.
- the information to be written is stored in the storage unit 56.
- the information generation unit 57 reads the information stored in the storage unit 56, and generates information to be returned based on the read information.
- the information to be returned generated by the information generation unit 57 is output to the modulation and demodulation unit 54.
- the modulation / demodulation unit 54 modulates the current flowing through the antenna 52 based on the information to be returned generated by the information generation unit 57, generates the current in the loop of the antenna 52 by the modulated current, and By changing the magnetic field penetrating through the coil 14 via 13, an induced current is caused to flow through the coil 14 to generate a response signal.
- the response signal generated in the coil 14 is output to the LNA 19 via the coupling circuit 18 and amplified by the LNA 19.
- the reflected wave amplified by the LNA 19 passes through a well-known bandpass filter 20 composed of an LC filter and is output to the demodulation unit 21 where it is demodulated into the original information signal and output as output data.
- the shape of the antenna 52 is not limited to an elliptical loop as shown in the figure, but may be, for example, an antenna 52 having a rectangular loop shape as shown in FIG. a, or as shown in FIG. 10 (b), the shape of the antenna 52b. may have a rhombic loop. Also, as shown in FIG. 10 (c), However, the shape of the antenna 52 c may have a smaller loop area, or as shown in FIG. 10 (d), the shape of the antenna 52 b may have a smaller loop area. Both ends may be bent. Further, the communication chip 53 need not be connected to the antenna 52 so as to be disposed near the center of the evening member 60, and as shown in FIG. It may be connected to the antenna 52 e so as to be arranged near the part.
- a strong magnetic field is locally generated in or near the gap 30 of the magnetic body 13 provided in the head '11.
- most of the magnetic circuit formed by the magnetomotive force of the coil 14 is composed of the magnetic material 13 with extremely high magnetic permeability, and the magnetic resistance is reduced. Since the magnetic flux is greatly increased, the density of the magnetic flux generated in the air gap 30 is greatly increased. For example, a much stronger magnetic field is generated in the air gap 30 compared to the conventional coil 101 shown in FIG. It is generated nearby. Therefore, efficient communication can be performed without contact between the head 11 and the antenna 5 by electromagnetic induction, and power saving can be achieved.
- the antenna 52 since the magnetic flux reaches the other end from one end of the core 13 via the gap 30, it is possible to prevent the magnetic flux from leaking to the surroundings.
- the closed-loop antenna 52 having one turn, that is, one turn of the electric wire is used, the antenna 52 is configured more simply and inexpensively.
- the shape of the core 13 is C-shaped, it is necessary to manufacture the core 13 having the void 30.
- the coil 14 can be easily wound around the core 13 and the head 11 can have a simple configuration.
- the air gap 30 made of a material having high magnetic permeability such as ferrite is used, almost no magnetic flux from one end of the core 13 reaches the other end via the air gap 30. Absent. Further, the tag member 60 can be easily transferred into the gap 30.
- the shape of the core 13 is tapered, the direction of the magnetic flux emitted from the end of the core 13 can be adjusted. As a result, it is possible to communicate with various antenna shapes by electromagnetic induction. Further, since the area of the plane through which the magnetic flux passes, that is, the cross-sectional area is small in the gap 30, the antenna can be miniaturized. In addition, since a strong magnetic field is generated by the core 13 and the magnetic flux is concentrated and passed through the loop of the antenna 52, it is possible to communicate by electromagnetic induction even with an antenna having a configuration in which induced current does not easily flow. .
- communication is performed by electromagnetic induction in a state where the tip of the core 13 is within the closed loop formed in the antenna 52. Communication can be performed efficiently with the transponder 51 as a target, and power can be saved. Further, it is possible to reliably write or read information to or from the transponder 51.
- the communication unit 10A includes the head, except for the configuration of the node 11A, the head included in the communication unit 10 of the first embodiment according to the present invention. Since the configuration is substantially the same as the configuration other than the configuration of FIG. 11 and the description other than the configuration of the head 11 included in the communication unit 10 of the first embodiment can be applied, the details are omitted.
- FIG. 7 is a perspective view of the head 11A.
- the head 11A is for communicating with the antenna 5 of the transponder 51 by electromagnetic induction.
- a pair of cylindrical cores 13Aa and 13Ab and wrapped around them are provided.
- Pair of The cores 13Aa and 13Ab are magnetic materials having sufficiently high magnetic permeability, such as ferrite, and have a shape having an air gap 3OA having the same dimensions as the air gap 30 described above between axial directions. Have.
- the area of the tip of the cores 13Aa and 13Ab facing the gap 3OA along the loop plane of the antenna 52 is formed in the antenna 52. It is formed smaller than the closed loop area.
- the coils 14Aa and 14Ab are wound around the cores 13Aa and 13Ab, and are connected to a coupling circuit 18 of the controller 12 described later.
- the communication by electromagnetic induction between the antenna 52 of the transponder 5 I and the head 11 A is performed by the core 13Aa, This operation is performed while the position of the end of the 13 Ab in the closed loop formed by the antenna 52 is detected.
- the signal is radiated from the end of the core 13 Aa to the end of the core 13 Ab based on the signal input to the coils 14 Aa and 14 Ab from the coupling circuit 18 and passes through the loop of the antenna 52.
- an induced current flows through the antenna 52 to generate a signal.
- the magnetic field generated in the loop of the antenna 52 based on the signal generated in the antenna 52 and passing through the coils 14Aa and 14Ab via the cores 13Aa and 13Ab is changed. Then, an induced current flows through the coils 14Aa and 14Ab, and a signal is generated.
- the signals generated in the coils 14Aa and 14Ab are output to the coupling circuit 18.
- a strong magnetic field is generated in the gap 3OA by the cores 13Aa and 13Ab provided in the head 11A. That is, since a part of the magnetic circuit formed by the magnetic force of the coils 14 Aa and 14 Ab is composed of the cores 13 Aa and 13 Ab having extremely high magnetic permeability and the magnetic resistance is reduced, the same phenomenon occurs. If the magnetic force generates a large amount of magnetic flux, the density of the magnetic flux generated in the air gap 3 OA is greatly increased.For example, compared to the conventional coil 101 shown in FIG. A strong magnetic field is generated near the air gap 30. Therefore, efficient communication can be performed without contact with the antenna 52 by electromagnetic induction, and power can be saved.
- the cores 13Aa and 13Ab are connected by the coils 14Aa and 14Ab connected in series. Since a magnetic field with a uniform phase can be generated, the cores can be separated according to the installation conditions and the allowable installation space. Also, the antenna shape and the arrangement of the transponder 51 on the evening member 60 can be flexibly handled.
- the third embodiment according to the present invention is substantially the same as the configuration other than the configuration of the communication unit 10 of the first embodiment according to the present invention except for the configuration of the communication unit 10B. Since the description other than the configuration of the communication unit 10 of the embodiment can be applied, the details are omitted.
- FIG. 8 is a block diagram showing a circuit configuration of the communication unit 10B.
- FIG. 9 is an external view showing a communication state between the communication unit 10 B and the transponder 51.
- the communication section 10B includes a pair of heads 1 ⁇ Ba, 11Bb and a controller 12B.
- the pair of heads 11 B a and 11 B b are for communicating with the antenna 52 of the transponder 51 by electromagnetic induction, respectively, and include the cores 13 Ba and 13 B b and the coils 14 Ba and 14 B b, respectively. It has.
- the head 11 1 Ba writes information into the transponder 51 by communicating exclusively with the antenna 52 by electromagnetic induction, and the head 1 Bb exclusively communicates with the antenna 52 by electromagnetic induction.
- 5 Information can be read from 1.
- the cores 13Ba and 13Bb are made of a magnetic material having a high magnetic permeability, such as fluoride, and have a C-shaped shape having voids 30Ba and 3OBb, as in the case of the above-mentioned 13. are doing.
- the cores 13Ba and 13Bb facing the voids 30Ba and 3OBb are tapered near both ends, and the cores 13Ba and 13Bb facing the voids 30Ba and 3OBb are tapered.
- the area along the loop plane of the antenna 52 at the distal end, that is, the area of both end faces, is sufficiently smaller than the area of the closed loop formed in the antenna 52.
- the coils 14 Ba, 14 Bb are wound around the cores 13 Ba, 13 Bb, and the coil 14 Ba is connected to a carrier amplification unit 17 B of a controller 12 B, which will be described later.
- the coil 14 B b It is connected to the LNA 19B of the controller 12B described later.
- the communication by electromagnetic induction between the antenna 52 of the transponder 51 and the heads 1 IBa and 11Bb is performed when the tips of the cores 13Aa and 1 Ab are viewed from the direction perpendicular to the loop plane of the antenna 52.
- the operation is performed in a state where it is contained in a closed loop formed in the antenna 52.
- the magnetic flux radiated from the end of the core 13Ba and passing through the loop of the antenna 52 is changed based on the signal input to the coil 14Ba from the carrier amplifier 17B, An induced current flows through the antenna 52 to generate a signal.
- the magnetic field generated in the loop of the antenna 52 based on the symbol input to the antenna 52 and penetrating through the coil 14 Bb via the core 13 Bb is changed, so that the coil 1 An induced current flows through 4 Bb and a signal is generated.
- the signal generated in coil 14Bb is output to LNA 19B.
- the controller 12B controls communication with the transponder 51, and includes a carrier generation unit 15, a carrier modulation unit 16, a carrier amplification unit 17B, an LNA 19B, a band-pass filter 20, And a demodulation unit 21.
- the carrier generation unit 15, the carrier modulation unit 16, the band-pass filter 20, and the demodulation unit 21 include a first real carrier wave generation unit 15, a carrier modulation unit 16, a band-pass filter 0, The details are omitted because they are substantially equivalent to the demodulation unit 21 and the description of the first embodiment can be applied.
- the carrier amplifier 17B (corresponding to the carrier amplifier 17 in the first embodiment) amplifies the carrier modulated by the carrier modulator 16 and outputs the amplified carrier to the coil 14Ba.
- LNA19B (corresponding to LNA19 of the first embodiment) amplifies the response signal input from coil 14Bb and outputs the amplified response signal to bandpass filter 0.
- the operation of the transponder 51 in communication is substantially the same as the operation of the transponder 51 according to the first embodiment, and the description of the first embodiment is applied. Details are omitted because they can be done.
- the communication by electromagnetic induction between the communication section I 0B and the transponder 51 is performed by the antenna 52.
- the RFID tag 50 is transported so that the tips of the cores 13Ba and 13Bb are positioned within a closed loop formed in the antenna 5. Whether the operation has been performed is detected by the position sensor 83.
- writing information to the transponder 51 information is transmitted between the head 11Ba and the antenna 52 by electromagnetic induction. Also, when reading the information stored in the transponder 51, the antenna 5 2 and the head 1 1B using the current modulated carrier wave sent from the head 11 B The information is received by the connection with the terminal b.
- the RFID tag is positioned by the position sensor 83 so that the tip of the core 13Ba is positioned within the closed loop formed in the antenna 5 when viewed from a direction perpendicular to the loop plane of the antenna 52.
- a trigger signal is input to carrier generation section 15.
- the carrier generator 15 generates a carrier when a trigger signal is input.
- the carrier generated by the carrier generator 15 is output to the carrier modulator 16.
- the carrier generated by the carrier generator 15 is modulated by the carrier modulator 16 based on the input data.
- the input data includes a command for the reactor 51 and additional information.
- a command for writing information and information to be written are input data.
- the carrier modulated by the carrier modulator 16 is output to the carrier amplifier 17 and amplified.
- the amplified carrier is output to the coil 14Ba of the head 118 &.
- the coil 14Ba is a primary coil
- the antenna 52 is a secondary coil
- an induced current flows through the antenna 52, and a carrier signal is generated.
- the magnetic flux is radiated from one end of the core 13Ba to the other end.
- the response signal amplified by L NA 19 B is output to band pass filter 20.
- the response signal amplified by the LNA 19B passes through a well-known LC filter, which is a bandpass filter 20, and is output to the demodulation unit 21.
- the reflected wave that has passed through the bandpass filter I0 is demodulated into the original information signal by the demodulation unit 21 and output as an output signal.
- the coupling circuit 18 And the circuit configuration of the communication unit 10B can be simplified. Further, since the component of the transmission signal wrapping around the reception signal can be reduced, the gain of LNA 19 B can be set to a large value, and the sensitivity can be increased.
- the antenna 52 is configured as a closed loop of one turn, that is, a single winding, but may be configured of a closed loop of multiple turns, that is, a multiple winding.
- the antenna 52 is configured in a planar shape, but is not limited to such a configuration, and for example, the antenna may be configured in a three-dimensional manner. .
- the transponder 51 is provided with the storage unit 56 to return the stored information.
- the present invention is not limited to such a configuration, and the transponder stores the information.
- a configuration in which a reflected wave not included is returned may be used. In such a configuration, the configuration of the communication unit can be simplified.
- the core 13 has a configuration having a C-shape, but the core is not limited to the C-shape as long as it has a space 30.
- the end of the core 13 is formed in a tapered shape, but any shape may be used as long as the magnetic flux can pass through the loop of the antenna 52.
- a gap A is formed between a pair of cores 13 A a and 13 A b which are rod-shaped magnetic bodies disposed in the axial direction, but the core is a rod-shaped core.
- the magnetic material is not limited to this, and may be an arc-shaped magnetic material.
- the cores 13 Aa and 13 Ab are composed of two magnetic materials, they may be composed of three or more magnetic materials.
- the area along the loop plane of the antenna 52 at the tip of the core 13 facing the gap 30 is smaller than the area of the closed loop formed in the antenna 52.
- the area along the loop plane of the antenna 52 at the tip of the core 13 may be larger than the area of the closed loop formed on the antenna 52 if communication by electromagnetic induction is possible.
- the tip of the core 13 is viewed from a direction perpendicular to the plane of the RFID tag 50 when inserted into the loop plane of the antenna 52, that is, the gap 30 during the transport process.
- Communication is performed by electromagnetic induction in a state in which the antenna is within the closed loop formed in the antenna 52, but only at the start of communication by conduction, the tip of the core 13 is in the closed loop formed in the antenna 52.
- a configuration may be employed in which a state where the end of the core 13 is within a closed loop formed in the antenna 52 may not be detected.
- the RFID tag 50 may be continuously conveyed, or may be conveyed by the position sensor 83 to a direction perpendicular to the loop plane of the antenna 52.
- the transport is temporarily stopped. It may be.
- the RFID tag 50 is conveyed so as to pass through or pass through the gap 30.However, in the vicinity of the gap 30, the loop-shaped antenna 52 crosses the magnetic flux. May be allowed to pass through.
- the communication unit 10 functioning as the communication device of the RFID tag writer 11 functions together with the print transport unit 2, but is not limited to such a configuration.
- a configuration that functions only with the communication unit 10 without performing printing or a configuration that functions with other devices may be used.
- the head 11 that functions as the communication device and the controller 12 that executes control to write information through the head 11 can be used for devices and applications other than the RFID tag writer 11.
- the embodiment has been described with respect to an example in which the RFID tag writer 1 is used as an information writing device or a writing and reading device for the RF ID tag 50, for example, in the embodiments of FIGS.
- the device may be used as a read-only device having only the node 1 iBb.
- the head and the communication target can be communicated with the UHP band by using electromagnetic induction between the head and the wireless link.
- Non-contact and efficient communication can be performed with the antenna of the transponder, and power saving can be achieved.
- the magnetic flux reaches one end of the magnetic body through the gap to the other end, so that the magnetic flux can hardly leak to the surroundings.
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Abstract
Description
Claims
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JP2003124788A JP2006215589A (ja) | 2003-04-30 | 2003-04-30 | 通信装置及び無線タグリーダー/ライター |
JP2003-124788 | 2003-04-30 |
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WO2004097725A1 true WO2004097725A1 (ja) | 2004-11-11 |
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PCT/JP2004/004135 WO2004097725A1 (ja) | 2003-04-30 | 2004-03-24 | 通信装置及び無線タグリーダー/ライター |
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Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7158033B2 (en) | 2004-09-01 | 2007-01-02 | Avery Dennison Corporation | RFID device with combined reactive coupler |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
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US7751790B2 (en) | 2006-09-28 | 2010-07-06 | Broadcom Corporation | Hybrid on-chip-off-chip transformer |
JP5334761B2 (ja) * | 2009-09-03 | 2013-11-06 | アズビル株式会社 | 食品工場用セキュリティカード |
JP6489043B2 (ja) * | 2016-03-03 | 2019-03-27 | 京セラドキュメントソリューションズ株式会社 | 画像形成装置及びプログラム |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
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JPS6491290A (en) * | 1987-10-01 | 1989-04-10 | Nippon Chemicon | Driving circuit of head core in ic card reader writer |
JPH05128324A (ja) * | 1991-11-07 | 1993-05-25 | Mitsubishi Electric Corp | 非接触カード、非接触カード用端末機及び非接触伝送システム |
JPH11161760A (ja) * | 1997-11-26 | 1999-06-18 | Hitachi Ltd | 薄型電子回路部品及びその製造方法及びその製造装置 |
JP2002109483A (ja) * | 2000-09-29 | 2002-04-12 | Tamura Electric Works Ltd | Icカードの位置検出方法およびicカード |
JP2002366917A (ja) * | 2001-06-07 | 2002-12-20 | Hitachi Ltd | アンテナを内蔵するicカード |
-
2003
- 2003-04-30 JP JP2003124788A patent/JP2006215589A/ja active Pending
-
2004
- 2004-03-24 WO PCT/JP2004/004135 patent/WO2004097725A1/ja not_active Application Discontinuation
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
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JPS6491290A (en) * | 1987-10-01 | 1989-04-10 | Nippon Chemicon | Driving circuit of head core in ic card reader writer |
JPH05128324A (ja) * | 1991-11-07 | 1993-05-25 | Mitsubishi Electric Corp | 非接触カード、非接触カード用端末機及び非接触伝送システム |
JPH11161760A (ja) * | 1997-11-26 | 1999-06-18 | Hitachi Ltd | 薄型電子回路部品及びその製造方法及びその製造装置 |
JP2002109483A (ja) * | 2000-09-29 | 2002-04-12 | Tamura Electric Works Ltd | Icカードの位置検出方法およびicカード |
JP2002366917A (ja) * | 2001-06-07 | 2002-12-20 | Hitachi Ltd | アンテナを内蔵するicカード |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
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US7158033B2 (en) | 2004-09-01 | 2007-01-02 | Avery Dennison Corporation | RFID device with combined reactive coupler |
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