WO2005029721A1 - 無線タグリーダライタ - Google Patents
無線タグリーダライタ Download PDFInfo
- Publication number
- WO2005029721A1 WO2005029721A1 PCT/JP2004/011847 JP2004011847W WO2005029721A1 WO 2005029721 A1 WO2005029721 A1 WO 2005029721A1 JP 2004011847 W JP2004011847 W JP 2004011847W WO 2005029721 A1 WO2005029721 A1 WO 2005029721A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- wireless tag
- circuit element
- antenna
- rfid
- writer
- Prior art date
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J3/00—Typewriters or selective printing or marking mechanisms characterised by the purpose for which they are constructed
- B41J3/44—Typewriters or selective printing mechanisms having dual functions or combined with, or coupled to, apparatus performing other functions
- B41J3/50—Mechanisms producing characters by printing and also producing a record by other means, e.g. printer combined with RFID writer
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K17/00—Methods or arrangements for effecting co-operative working between equipments covered by two or more of main groups G06K1/00 - G06K15/00, e.g. automatic card files incorporating conveying and reading operations
- G06K17/0022—Methods or arrangements for effecting co-operative working between equipments covered by two or more of main groups G06K1/00 - G06K15/00, e.g. automatic card files incorporating conveying and reading operations arrangements or provisions for transferring data to distant stations, e.g. from a sensing device
- G06K17/0025—Methods or arrangements for effecting co-operative working between equipments covered by two or more of main groups G06K1/00 - G06K15/00, e.g. automatic card files incorporating conveying and reading operations arrangements or provisions for transferring data to distant stations, e.g. from a sensing device the arrangement consisting of a wireless interrogation device in combination with a device for optically marking the record carrier
-
- 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
- G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
- G06K7/0008—General problems related to the reading of electronic memory record carriers, independent of its reading method, e.g. power transfer
-
- 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
- G06K7/10019—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 resolving collision on the communication channels between simultaneously or concurrently interrogated record carriers.
- G06K7/10069—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 resolving collision on the communication channels between simultaneously or concurrently interrogated record carriers. the collision being resolved in the frequency domain, e.g. by hopping from one frequency to the other
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B5/00—Near-field transmission systems, e.g. inductive or capacitive transmission systems
- H04B5/40—Near-field transmission systems, e.g. inductive or capacitive transmission systems characterised by components specially adapted for near-field transmission
- H04B5/48—Transceivers
-
- 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
Definitions
- the present invention relates to a wireless tag reader / writer that reads and writes information from and to a wireless tag that can write and read information wirelessly.
- RFID Radio Frequency Identification
- transponder small wireless tag
- This RFID system can read information stored in the wireless tag by wireless communication even when the wireless tag is dirty or placed in an invisible position. Practical use is expected in various fields such as management and inspection processes. For example, it is an inspection system using an RFID tag described in Patent Document 1.
- Patent Document 2 As a writer (writing device) that writes blue information to the wireless tag circuit element, one described in Patent Document 2 is known.
- a strip of paper to which rectangular labels are attached at predetermined intervals is sequentially unwound from a paper supply unit and supplied from one side of a housing, and predetermined information generated by a module in the housing is obtained.
- the read-out Z writing antenna provided on the belt-shaped paper transport path, writing is sequentially performed on the IC circuit portion of the RFID tag circuit element. Is performed and finally discharged from the other side of the housing.
- Patent Document 3 As a writer (writing device) for writing fine weather information to the wireless tag circuit element, one described in Patent Document 3 is known.
- the RFID tag circuit element attached to each label is generated on the device side with respect to the RFID circuit element side attached to each label. By transmitting the predetermined information, writing is sequentially performed on the IC circuit portion of the wireless tag circuit element.
- Patent Document 1 Japanese Patent Application Laid-Open No. 2002-308437
- Patent Document 2 Japanese Patent Application Laid-Open No. 2002-2026 (Paragraph No. 0002—0009, FIG. 14)
- Patent Document 3 JP-A-2002-230499 (Paragraph Nos. 0012-0021, FIGS. 1 and 2)
- the present inventors have focused on this interaction and continued intensive research, and as a result, came up with a wireless tag reader / writer that can reliably communicate with only the target wireless tag.
- the present invention has been made in view of the above circumstances, and an object of the present invention is to provide a wireless tag reader / writer that reliably performs communication only with a target wireless tag. It is in.
- the gist of the first invention is to provide an IC circuit unit for storing predetermined information and a tag-side antenna connected to the IC circuit unit for transmitting and receiving information.
- the RFID tag circuit element having the An access information generating unit for accessing the wireless tag information of the IC circuit unit for accessing the information, and reading and writing the information, and a carrier wave for accessing the wireless tag information of the IC circuit unit.
- a carrier modulation unit that modulates a carrier wave generated by the carrier wave using the access information generated by the access information generation unit, and a carrier wave modulated by the carrier wave modulation unit.
- a modulated wave amplifier for amplifying the modulated wave and an output of the modulated wave amplifier are transmitted to the IC circuit unit in a non-contact manner by radio communication using a high frequency such as a UHF band to access the wireless tag information.
- a wireless tag reader / writer having a device-side antenna for performing wireless communication, wherein the wireless tag circuit element is arranged within a predetermined proximity communication range, and the wireless tag circuit element has a wireless tag reader / writer. Setting the frequency of the carrier wave generated by the carrier generation unit based on the resonance frequency of the tag side antenna of the wireless tag circuit element changed by the mutual coupling between the antenna and the antenna of the wireless tag reader / writer. It is a wireless tag reader / writer characterized by the following.
- the gist of the second invention is to provide a wireless circuit having an IC circuit unit for storing predetermined information and a tag-side antenna connected to the IC circuit unit for transmitting and receiving information.
- a wireless tag circuit element storage unit configured to store a plurality of tag circuit elements and to sequentially remove the tag circuit elements; an access information generating unit that accesses wireless tag information of the IC circuit unit; and a wireless unit of the IC circuit unit
- a carrier generator for generating a carrier for accessing the tag information; a carrier modulator for modulating a carrier generated by the carrier using the access information generated by the access information generator;
- a modulated wave amplifier for amplifying the modulated wave modulated by the modulator, and the output of the modulated wave amplifier is connected to the IC in a non-contact manner by wireless communication using a high frequency such as a UHF band.
- a device-side antenna for transmitting to the road and accessing the wireless tag information; and a wireless tag circuit element sequentially taken out from the wireless tag circuit element storage unit, for accessing the wireless tag information from the device-side antenna.
- a wireless tag circuit element holding unit that holds the wireless tag circuit element in a predetermined access area, wherein the wireless tag circuit element storage unit is configured such that the tag-side antenna of the stored wireless tag circuit element has an antenna sensitivity of the device-side antenna.
- the wireless tag reader / writer is arranged so as to be located in a relatively low area of the wireless tag.
- the gist of the third invention is to provide an IC circuit unit for storing predetermined information and a tag-side antenna connected to the IC circuit unit for transmitting and receiving information.
- a wireless tag circuit element storage unit configured to store a plurality of wireless tag circuit elements having the same and to be able to sequentially take out the wireless tag circuit elements, an access information generating unit that accesses wireless tag information of the IC circuit unit, and the IC circuit unit
- a carrier generator for generating a carrier for accessing the wireless tag information of the above, and a carrier modulator for modulating a carrier generated by the carrier using the access information generated by the access information generator.
- a modulated wave amplifier that amplifies the modulated wave modulated by the carrier wave modulator, and an output of the modulated wave amplifier is contactlessly transmitted by wireless communication using a high frequency such as a UHF band.
- the device-side antenna that transmits the information to the IC circuit and accesses the wireless tag information, and the wireless tag circuit elements sequentially taken out of the wireless tag circuit element storage unit access the wireless tag information from the device-side antenna.
- a wireless tag circuit element holding unit for holding the wireless tag circuit element in a predetermined access area, wherein the device-side antenna is an antenna of the wireless tag circuit element of the wireless tag circuit element housed in the wireless tag circuit element storage unit.
- a wireless tag reader / writer is arranged so as to be located in a region where sensitivity is relatively low.
- the gist of the fourth invention is to provide an IC circuit unit for storing predetermined information and a tag-side antenna connected to the IC circuit unit for transmitting and receiving information.
- a wireless tag circuit element storage unit configured to store a plurality of wireless tag circuit elements having the same and to be able to sequentially take out the wireless tag circuit elements; an access information generating unit that accesses wireless tag information of the IC circuit unit;
- a carrier generator for generating a carrier for accessing the wireless tag information of the above, and a carrier modulator for modulating a carrier generated by the carrier using the access information generated by the access information generator.
- a modulated wave amplifier that amplifies the modulated wave modulated by the carrier wave modulator, and an output of the modulated wave amplifier is contactlessly transmitted by wireless communication using a high frequency such as a UHF band.
- the device-side antenna that transmits the information to the IC circuit and accesses the wireless tag information, and the wireless tag circuit elements sequentially extracted from the wireless circuit element storage unit access the wireless tag information from the device-side antenna.
- a wireless tag circuit element holding unit that holds the wireless tag circuit element in a predetermined access area, and wherein the wireless tag circuit element storage unit and the device-side antenna are
- the RFID tag circuit element accommodated in the RFID tag circuit element accommodating portion is arranged such that the polarization plane of the tag-side antenna and the polarization plane of the apparatus-side antenna are twisted with each other.
- Wireless tag reader / writer is arranged such that the polarization plane of the tag-side antenna and the polarization plane of the apparatus-side antenna are twisted with each other.
- the gist of the fifth invention is to provide an IC circuit unit for storing predetermined information and a tag-side antenna connected to the IC circuit unit for transmitting and receiving information.
- a wireless tag circuit element storage unit configured to store a plurality of wireless tag circuit elements having the same and to be able to sequentially take out the wireless tag circuit elements, an access information generating unit that accesses wireless tag information of the IC circuit unit, and the IC circuit unit
- a carrier generator for generating a carrier for accessing the wireless tag information, and a carrier modulator for modulating a carrier generated by the carrier using the access information generated by the access information generator.
- a modulated wave amplifier that amplifies the modulated wave modulated by the carrier wave modulator, and an output of the modulated wave amplifier is contactlessly transmitted by wireless communication using a high frequency such as a UHF band.
- the device-side antenna that transmits the information to the IC circuit unit and accesses the wireless tag information
- the wireless tag circuit element storage unit that sequentially accesses the wireless tag circuit element accesses the wireless tag information from the device-side antenna.
- a wireless tag circuit element holding unit that holds the wireless tag circuit element in a predetermined access area, wherein the wireless tag circuit element storage unit is configured such that the tag-side antenna of the stored wireless tag circuit element is the same as the device-side antenna.
- the wireless tag circuit element housing portion and the device-side antenna are disposed so as to be located in a region where the antenna sensitivity is relatively low, and the wireless tag circuit element housing portion of the wireless tag circuit element housing portion of the wireless tag circuit element housing portion is provided.
- a wireless tag reader characterized in that the polarization plane of the tag-side antenna and the polarization plane of the device-side antenna are arranged so as to be twisted with respect to each other. It is a plate.
- the gist of the sixth invention is to provide an IC circuit unit for storing predetermined information and a tag-side antenna connected to the IC circuit unit for transmitting and receiving information.
- a wireless tag circuit element storage unit configured to store a plurality of wireless tag circuit elements having the same and to be able to sequentially take out the wireless tag circuit elements, an access information generating unit that accesses wireless tag information of the IC circuit unit, and the IC circuit unit
- a carrier generator for generating a carrier for accessing the wireless tag information, and a carrier modulator for modulating a carrier generated by the carrier using the access information generated by the access information generator.
- a modulated wave amplifier that amplifies the modulated wave modulated by the carrier wave modulator, and an output of the modulated wave amplifier is transmitted to the IC circuit unit in a non-contact manner by wireless communication using a high frequency such as a UHF band.
- the device-side antenna has a relatively low antenna sensitivity of the tag-side antenna of the wireless tag circuit element stored in the wireless tag circuit element storage unit.
- the RFID tag circuit element storage portion and the device-side antenna are disposed so as to be located in the area. Polarization of the serial tag antenna and the polarization plane of the apparatus antenna is, so as to form a twist of position with each other, a wireless tag reader-writer, characterized in that it is arranged.
- the gist of the seventh invention is to provide an IC circuit unit for storing predetermined information and a tag-side antenna connected to the IC circuit unit for transmitting and receiving information.
- a wireless tag circuit element storage unit configured to store a plurality of wireless tag circuit elements having the same and to be sequentially taken out, and an access information generating unit that generates access information for accessing the wireless tag information of the IC circuit unit.
- a directional antenna that transmits the access information generated by the access information generation unit to the tag-side antenna by wireless communication in a non-contact manner, and accesses the wireless tag information of the circuit unit; and the wireless tag.
- the wireless tag circuit elements sequentially taken out from the circuit element storage section are held in a predetermined access area for accessing the wireless tag information from the directional antenna.
- a wireless tag circuit element holding unit, the wireless tag circuit element holding unit is disposed on the directional direction side of the directional antenna, and the wireless tag circuit element storage unit includes the directional antenna.
- a wireless tag reader / writer which is disposed on the side opposite to the directivity direction of the wireless tag reader / writer.
- the gist of the eighth invention is to provide an IC circuit unit for storing predetermined information and a tag-side antenna connected to the IC circuit unit for transmitting and receiving information.
- a wireless tag circuit element storage unit configured to store a plurality of wireless tag circuit elements having the same and to be sequentially taken out, and an access information generating unit that generates access information for accessing the wireless tag information of the IC circuit unit. Before it was generated by the access information generator The access information is transmitted to the tag-side antenna in a non-contact manner by wireless communication, and the directional antenna for accessing the wireless tag information of the circuit unit and the wireless device sequentially taken out from the wireless tag circuit element storage unit.
- a wireless tag circuit element holding unit that holds the tag circuit element in a predetermined access area for accessing the wireless tag information from the directional antenna, and a shield unit that reduces the strength of a wireless communication signal;
- the wireless tag circuit element holding section is disposed on the directional direction side of the directional antenna, and the shield section is located on the directional direction side of the directional antenna with respect to the wireless tag circuit element holding section.
- the RFID tag circuit element storage portion is disposed on the directional direction side of the directional antenna with respect to the shield portion. It is intended to.
- the tag-side antenna of the wireless tag circuit element and the device side of the wireless tag reader / writer Since the resonance frequency of the tag-side antenna of the RFID tag circuit element changed by the mutual coupling with the antenna is set as the frequency of the carrier wave generated by the carrier oscillation unit of the RFID tag reader / writer, it is within the close range.
- Some RFID tag circuit elements to be communicated have high sensitivity.Other RFID tag circuit elements transmit a carrier wave with a low sensitivity, so communication with the RFID tag to be communicated is not a communication target. Interference with the element can be suitably prevented. That is, it is possible to provide a wireless tag reader / writer that reliably communicates only with the target wireless tag circuit element.
- the proximity communication range is such that the distance between the tag-side antenna of the wireless tag circuit element and the device-side antenna of the wireless tag reader / writer is determined by the wireless tag circuit element.
- Resonance frequency when it exists alone or when placed at a position where mutual coupling between the antenna on the device side of the RFID tag reader / writer and the antenna on the tag side of the RFID tag circuit element can be ignored (hereinafter referred to as free space resonance frequency)
- free space resonance frequency when it exists alone or when placed at a position where mutual coupling between the antenna on the device side of the RFID tag reader / writer and the antenna on the tag side of the RFID tag circuit element can be ignored
- free space resonance frequency the distance between the tag-side antenna of the wireless tag circuit element and the device-side antenna of the wireless tag reader / writer is the free-space resonance frequency of the wireless tag circuit element.
- a carrier wave having a frequency higher than the resonance frequency of the tag-side antenna of the wireless tag circuit element at a position 0.5 times the wavelength corresponding to the above is generated.
- the wireless communication device is a wireless tag reader / writer which reads and writes information by communicating with a wireless tag circuit element having a half-wavelength dipole antenna as the tag-side antenna.
- the range is such that the distance between the tag-side antenna of the wireless tag circuit element and the device-side antenna of the wireless tag reader / writer is not more than 0.05 times the wavelength corresponding to the free space resonance frequency, and A carrier having a frequency not less than 1.03 times the free space resonance frequency of the tag is generated by the carrier generation unit.
- the tag-side antenna of the RFID circuit element and the device-side antenna of the RFID reader / writer are connected to each other.
- the proximity communication range is such that a distance between an antenna of the RFID circuit element and an antenna of the RFID tag reader / writer on the device side is 0.2 times or more of a wavelength corresponding to the free space resonance frequency. 0.4 times or less and the distance between the tag-side antenna of the RFID tag and the device-side antenna of the RFID tag reader / writer is within the range.
- a carrier having a resonance frequency is generated by the carrier generator.
- the change in the resonance frequency of the tag-side antenna of the wireless tag circuit element is caused by the distance between the tag-side antenna of the wireless tag circuit element and the device-side antenna of the wireless tag reader / writer corresponding to the wavelength corresponding to the free space resonance frequency. Since the minimum value is shown in the range of 0.2 times or more and 0.4 times or less, communication using the frequency and communication range within that range will ensure more reliable communication with only the target RFID tag circuit element. Can communicate between them.
- the mode is switched between a near communication mode in which communication is performed only with the wireless tag circuit element within the near communication range and a distant communication mode in which communication with a wireless tag circuit element outside the close communication range is performed.
- a mode switching unit wherein a frequency of a carrier wave generated by the carrier generation unit in the near field communication mode and a frequency of a carrier wave generated in the long distance communication mode are set to different frequencies.
- the access information generated by the access information generation unit is used by the carrier modulation unit to be used by the carrier modulation unit.
- the carrier wave from the generator is modulated and further amplified by the modulated wave amplifier, and then transmitted from the antenna on the device side to the IC circuit side of the wireless tag circuit element in a non-contact manner, whereby the wireless tag information of the IC circuit is Access to is made.
- the RFID circuit element storage section is arranged such that the stored antenna of the RFID circuit element (tag side antenna) is located in a region where the antenna sensitivity of the apparatus side antenna is relatively low.
- the wireless tag circuit element is housed in the wireless tag circuit element housing section. Communication with the RFID tag circuit element that was established is not established, and after being removed from the RFID tag circuit element storage unit, only the RFID tag information of the IC circuit of the RFID tag circuit element held in the RFID tag circuit element holding unit is accessed. Becomes possible. As a result, even when a high frequency such as the UHF band is used, the reading or writing of the RFID tag information is performed only to the RFID tag circuit element to be read or written by a simple structure and a simple method.
- the device-side antenna is located in a region where the antenna sensitivity of the antenna (tag-side antenna) of the wireless tag circuit element housed in the wireless tag circuit element housing portion is relatively low.
- the antenna sensitivity of the tag-side antenna of the wireless tag circuit element stored in the wireless tag circuit element storage unit with respect to the device-side antenna is low, and the communication signal strength is reduced. Communication with the RFID circuit element stored in the RFID circuit element storage section was not established during the operation, and after being removed from the RFID circuit element storage section, the communication of the RFID circuit element held in the RFID circuit element holding section was stopped. Only the wireless tag information of the IC circuit can be accessed.
- the wireless tag information can be read or written only to the wireless tag circuit element to be read or written by a simple structure and a simple method, and the shield can be performed. It does not require methods such as environment construction or Koide Kai-Dani's identification communication. In other words, even when using a high frequency such as the UHF band, there is no need to construct a shielded environment or to use small-output identification communication, etc., and read / write data using a simple structure and a simple method. It is possible to read or write the wireless tag information only to the wireless tag circuit element.
- the maximum communication signal strength between the two is not parallel.
- the polarization plane of the tag-side antenna of the housed wireless tag circuit element and the plane of polarization of the apparatus-side antenna are orthogonal to each other.
- the wireless tag housed in the wireless tag Communication with the wireless tag circuit element is not established, and after being removed from the wireless tag circuit element storage section, only the wireless tag information of the IC circuit of the wireless tag circuit element held in the wireless tag circuit element holding section can be accessed.
- the wireless tag information can be read or written only to the wireless tag circuit element to be read or written by a simple structure and a simple method.
- it does not require methods such as construction of a shield environment or minimization of output and identification communication.
- a high frequency such as the UHF band it is not necessary to construct a shielded environment or to reduce the output power or use a method such as identification communication. Reading or writing of wireless tag information can be performed only on the path element.
- the wireless tag circuit element is arranged such that the antenna (tag-side antenna) of the stored wireless tag circuit element is located in a region where the antenna sensitivity of the device-side antenna is relatively low.
- the storage section is arranged, and further, the RFID tag circuit element storage section and the device-side antenna are arranged such that the polarization plane of the tag-side antenna of the stored RFID circuit element and the polarization plane of the apparatus-side antenna are orthogonal to each other.
- the polarization planes of both antennas do not match.
- the antenna (tag-side antenna) of the wireless tag circuit element housed in the wireless tag circuit element housing section has a relatively low antenna sensitivity.
- the antenna on the device side is arranged so as to be placed, and the RFID tag circuit element is further placed so that the polarization plane of the tag side antenna of the stored RFID circuit element and the polarization plane of the device side antenna are orthogonal to each other.
- the antenna sensitivity from the tag side antenna of the RFID circuit element stored in the RFID circuit element storage section to the device side antenna is low, Since the planes of polarization do not match and the strength of the communication signal is significantly reduced, communication with the RFID circuit element stored in the RFID circuit element housing is not established, and the wireless signal is removed from the RFID circuit element housing. After that, only the wireless tag information of the IC circuit of the wireless tag circuit element held in the wireless tag circuit element holding unit can be accessed. As a result, even when using a high frequency such as the UHF band, it is possible to reliably read or write the RFID tag information only to the RFID tag circuit element to be read or written by a simple structure and a simple method.
- the RFID tag circuit element accommodating section is characterized in that the tag-side antenna of the accommodated RFID tag circuit element is an electric field intensity from the device-side antenna. Is located in a region of: L / 10 or less in the RFID tag circuit element holding section.
- the tag-side antenna is arranged in a region where the electric field strength from the device-side antenna is 1/10 or less of the wireless tag circuit element holding unit, so that the wireless device housed in the wireless tag circuit element housing unit is provided. Access to the tag circuit element from the device-side antenna can be reliably prevented.
- the RFID tag circuit element accommodating portion is configured such that the tag-side antenna of the accommodated RFID tag circuit element has a radiation directivity of the device-side antenna. It is arranged so as to be located in a substantially minimum area.
- the device-side antenna for the wireless tag circuit element housed in the wireless tag circuit element housing portion can be arranged by arranging the tag-side antenna in a so-called null area where the device-side antenna has almost no radiation directivity. Can be more reliably prevented from being accessed.
- the device-side antenna is configured such that the strength of a reflected electric field of the stored wireless tag circuit element from the tag-side antenna is equal to the strength of the wireless tag circuit.
- the RFID tag circuit element held by the element holding section is arranged so as to be located in a region where the intensity of the reflected electric field from the tag-side antenna is 1/10 or less. With this configuration, the strength of the reflected electric field from the tag-side antenna of the stored RFID circuit element is determined by the intensity of the reflected electric field from the tag-side antenna of the RFID circuit element held by the RFID circuit element holding portion.
- the device-side antenna By arranging the device-side antenna in an area that is 1/10 or less of the strength, the strength of the communication signal between the device-side antenna and the wireless tag circuit element stored in the wireless-tag circuit element storage section is small, and communication is performed. Is not established, and access from the device-side antenna can be reliably prevented.
- the device-side antenna is the tag side of the wireless tag circuit element located closest to the take-out side among the stored wireless tag circuit elements.
- the antenna is arranged so as to be located in a region where the radiation directivity of the antenna is substantially minimized.
- the device-side antenna is arranged in a so-called null region where the radiation directionality of the tag-side antenna of the RFID tag circuit element located closest to the RFID tag circuit element holding portion is almost zero. Access from the device-side antenna to the wireless tag circuit element stored in the circuit element storage section can be more reliably prevented.
- the wireless tag circuit element storage section and the device-side antenna are provided in the wireless tag circuit element storage section.
- the polarization plane of the tag-side antenna of the tag circuit element and the polarization plane of the device-side antenna are arranged so as to form an angle of 60 ° or more and 90 ° or less.
- the wireless tag circuit In the radio-frequency element storage unit and the device-side antenna the polarization plane of the tag-side antenna and the polarization plane of the device-side antenna of the RFID circuit element stored in the RFID circuit element storage unit are substantially 90 °. And so on. With this configuration, by making the angle between the polarization plane of the tag-side antenna and the polarization plane of the apparatus-side antenna substantially 90 °, communication becomes almost impossible, and the radio wave stored in the radio-frequency tag circuit element housing part is reduced. Access to the tag circuit element from the device-side antenna can be more reliably prevented.
- the RFID circuit element storage section and the RFID circuit element holding section are provided in the RFID circuit element storage section.
- the polarization plane of the tag-side antenna at the take-out position of the RFID circuit element and the polarization plane of the tag-side antenna of the RFID circuit element already taken out and held in the RFID circuit element holding section are 60 °. They are arranged so that they make an angle of 90 ° or more. With this configuration, the angle of the plane of polarization when taken out of the RFID tag circuit element storage section and the direction of polarization when held by the RFID tag circuit element holding section form an angle of at least 60 ° or more.
- the wireless communication between the device-side antenna and the wireless tag circuit element in the wireless tag circuit element storage unit is improved.
- the polarization plane of the tag-side antenna at the take-out position and the polarization plane of the tag-side antenna of the wireless tag circuit element held by the wireless tag circuit element holding section are set to 60 degrees.
- the device further comprises a turning / conveying unit for conveying the RFID tag circuit element while turning the direction from the take-out position to the RFID tag circuit element holding unit so as to form an angle of not less than 90 ° and not more than 90 °. is there.
- the direction of polarization of the tag side antenna can be changed by at least 60 ° or more. .
- the strength of the communication signal from the device-side antenna to the tag-side antenna in the RFID tag circuit element storage unit is at least half the strength of the communication signal from the device-side antenna to the tag-side antenna in the RFID tag circuit element holding unit.
- the RFID circuit element storage section and the RFID circuit element holding section are arranged such that the RFID circuit element storage section includes the RFID tag circuit element storage section.
- the polarization plane of the tag-side antenna at the position where the RFID tag circuit element is taken out and the polarization plane of the tag-side antenna of the RFID circuit element already taken out and held in the RFID circuit element holding part are approximately 90 °. It is arranged so as to form. With this configuration, the polarization plane direction when taken out from the RFID tag circuit element storage section is substantially 90 ° with the polarization plane direction when held by the RFID tag circuit element holding section.
- communication from the device-side antenna to the tag-side antenna of the wireless tag circuit element in the wireless tag circuit element storage section can be substantially disabled, and the apparatus for the wireless tag circuit element stored in the wireless tag circuit element storage section can be prevented. Access from the side antenna can be more reliably prevented.
- the polarization plane of the tag-side antenna at the take-out position and the polarization plane of the tag-side antenna of the wireless tag circuit element held by the wireless tag circuit element holding section are substantially 90 degrees.
- a turning transport unit for transporting the RFID circuit element while turning the direction from the take-out position to the RFID circuit element holding unit is further provided. With this configuration, the direction of the RFID circuit element is changed between the time when the RFID circuit element is taken out from the RFID circuit element storage section and the time when the RFID circuit element is transported to the RFID tag circuit element holding section for reading or writing information. By turning, the direction of the polarization plane of the tag-side antenna can be changed by approximately 90 °.
- the RFID circuit element storage section includes a reel member for winding a tape-shaped material on which the plurality of wireless tag circuit elements are sequentially formed in a longitudinal direction thereof. With this configuration, the plurality of RFID circuit elements can be sequentially taken out by rotating the reel member and unwinding the tape-shaped material.
- the RFID circuit element storage section stores a plurality of flat paper-like label materials, each having one RFID circuit element formed thereon, stacked in a flat stacking direction. Tray member.
- a plurality of RFID circuit elements can be sequentially taken out by pulling out one sheet of label material one by one from the take-out opening provided on one side (for example, the side) of the tray member. it can.
- the access information generated by the access information generating unit is transmitted wirelessly from the directional antenna on the device side in a non-contact manner.
- the information is transmitted to the IC circuit unit side via the tag-side antenna of the tag circuit element, thereby accessing the wireless tag information of the IC circuit unit.
- a wireless tag circuit element holding portion is provided on a directional direction side of a directional antenna having a certain directivity to form an access area, and a wireless tag circuit element containing a plurality of wireless tag circuit elements is provided.
- the storage section is arranged on the side opposite to the directivity of the directional antenna.
- the antenna sensitivity from the directional antenna on the device side is high and the strength of the wireless communication signal is increased, while the RFID tag circuit elements are stored in the RFID tag circuit element storage section.
- the antenna sensitivity from the directional antenna on the device side is low for the wireless tag circuit element and the outlet direction, and the strength of the wireless communication signal is reduced.
- communication with the RFID circuit element stored in the RFID circuit element storage section is not established, and after being removed from the RFID circuit element storage section, the wireless tag held in the RFID circuit element holding section is not held. Only the wireless tag information of the IC circuit of the circuit element can be accessed (radiation is performed).
- the wireless tag circuit element held in the access area the antenna sensitivity from the directional antenna on the device side is high, and the strength of the wireless communication signal is high, while the device side is in the direction of the wireless tag circuit element stored in the wireless tag circuit element storage part and the outlet direction.
- the antenna sensitivity from the directional antenna is low, and the strength of the wireless communication signal is reduced.
- a wireless tag to be read or written using a simple structure and a simple method does not require a method of establishing a shielded environment or reducing the output power, such as identification communication.
- Information can be read or written only to circuit elements.
- the directional antenna is a microstrip antenna having a microstrip antenna element on one side and a ground plane on the other side.
- the wireless tag circuit element to be read or written can be used to transmit the RFID tag information only. Can read or write.
- the RFID circuit element holding section is disposed on the microstrip antenna element side, and the RFID circuit element storage section is disposed on the base plate side.
- the wireless tag circuit element holding unit is arranged on the microstrip antenna element side, which is the directivity direction, and the wireless tag circuit element storage unit is arranged on the ground plane side opposite to the directivity direction.
- the RFID tag information can be reliably read or written only from the RFID tag circuit element to be read or written.
- the microstrip antenna element has a dimension in a direction along a longitudinal direction of the tag-side antenna in a state where the wireless tag circuit element is held in the access area, and the tag-side antenna has a tag-side dimension. It is smaller than the longitudinal dimension of the antenna.
- the length of the microstrip antenna element in the directivity direction is larger than the longitudinal dimension of the tag-side antenna. The long and partial radiation is not transmitted / received to / from the tag antenna and does not contribute much to signal transmission / reception.
- a shield unit for reducing the intensity of a wireless communication signal is provided on the direction side of the RFID tag circuit element holding unit. In this way, while signal transmission / reception between the directional antenna and the tag-side antenna held in the RFID tag circuit element holding portion is ensured, signal radiation in the directional direction side is further shielded. Thus, leakage to the outside of the device can be reduced.
- the wireless communication apparatus further includes an outlet for discharging the RFID circuit element from which access to the RFID tag information of the IC circuit section has been completed in the access area to the outside of the apparatus.
- an outlet for discharging the RFID circuit element from which access to the RFID tag information of the IC circuit section has been completed in the access area to the outside of the apparatus is possible to smoothly discharge the RFID circuit element, for which the reading or writing processing of the RFID information of the IC circuit section has been completed, in the access area to the outside of the apparatus.
- the outlet is arranged in a direction substantially perpendicular to the direction of the directivity of the directional antenna.
- the outlet is arranged in a direction substantially perpendicular to the direction in which the signal intensity from the directional antenna weakens, it is possible to suppress signal leakage to the outside of the device.
- the outlet is arranged in a direction in which the electric field strength of the directional antenna is smaller than the electric field strength in the directional direction of the directional antenna by 10 dB or more. In this way, by arranging the outlet in a direction in which the direction of the electric field from the directional antenna and the electric field strength is reduced by 10 dB or more, it is possible to reliably suppress signal leakage to the outside of the device.
- the ground plate is configured such that its size is larger than the projected area of the RFID circuit element housing portion as viewed from the microstrip antenna. With this configuration, it is possible to reliably block a signal leaking to the RFID tag circuit element housing portion side and to reduce the sneaking of a radio wave by the ground plane.
- the base plate includes a side wall portion extending toward a side of the RFID circuit element storage section and opposite to the microstrip antenna element.
- the signal leaking to the RFID circuit element housing section can be more reliably prevented by covering the RFID circuit element housing section from the side with the side wall of the base plate.
- the base plate has a substantially U-shape.
- the signal leakage to the RFID circuit element storage unit side can be prevented by covering the RFID circuit element storage unit from the side with the side wall of the substantially U-shaped base plate.
- the access information generated by the access information generating unit is transmitted wirelessly from the directional antenna on the device side in a non-contact manner.
- the information is transmitted to the IC circuit section via the tag-side antenna of the tag circuit element, thereby accessing the wireless tag information of the IC circuit section.
- an RFID tag circuit element holding section is provided on the directional direction side of a directional antenna having directivity in a certain direction to form an access area, and the directional antenna is further extended from the RFID tag circuit element holding section.
- a shield part is provided on the directional direction side to shield communication signal components in the directional direction side.
- the RFID circuit element housing section housing a plurality of RFID circuit elements is arranged further in the directionality direction than the shield section in which the leakage is blocked.
- the antenna sensitivity from the directional antenna on the device side is high and the strength of the wireless communication signal is increased, while the RFID tag circuit element is stored in the RFID tag circuit element storage section.
- the antenna action from the directional antenna on the device side is low and the strength of the wireless communication signal is reduced due to the above-described shielding action of the shield portion.
- an interval between the shield unit and the holding unit is wider than an interval between the directional antenna and the holding unit.
- the directional antenna is a microstrip antenna having a microstrip antenna element on one side and a ground plane on the other side.
- the device can be made compact, and the directivity of the microstrip antenna element and the microstrip antenna having the ground plane toward the antenna element side can be used to read or write the radio signal. Reading or writing of wireless tag information can be performed only on the tag circuit element.
- the RFID tag circuit element holding section is arranged on the microstrip antenna element side of the microstrip antenna, and transmits a communication signal to a ground plane side of the microstrip antenna.
- This is provided with a reflecting portion for reflecting.
- the microstrip antenna element holding section is arranged on the microstrip antenna element side, which is the directivity direction, and the reflection section is provided on the ground plane side opposite to the directivity direction, so that the microstrip antenna element is provided. While reading or writing the RFID tag information on the RFID tag circuit element to be read or written on the side, it is possible to shield the signal from the opposite side of the ground plane to the outside of the device.
- the microstrip antenna element has a dimension in a direction along a longitudinal direction of the tag-side antenna in a state where the wireless tag circuit element is held in the access area, the tag-side antenna element having a dimension on the tag side. It is smaller than the longitudinal dimension of the antenna. In this way, when signals are transmitted and received by bringing the microstrip antenna element and the tag-side antenna close to each other, radiation of a portion of the microstrip antenna element longer than the longitudinal dimension of the tag-side antenna in the directivity direction is reduced. It does not contribute much to signal transmission and reception because it leaks easily without being transmitted to and received from the tag side antenna.
- the eighth invention of this application Correspondingly, by making the longitudinal dimension of the antenna element shorter than that of the tag-side antenna, signals can be transmitted and received efficiently.
- the RFID tag circuit element storage section is detachably attached to a wireless tag reader / writer body, and the shield section is provided on the wireless tag reader / writer body.
- the shield section is provided on the detachable RFID tag circuit element housing, It is necessary to equip a separate shield part for each tag circuit element storage part, which increases the manufacturing cost.
- the eighth invention of the present application by providing the shield portion in the main body of the wireless tag reader / writer, the above can be avoided and the manufacturing cost can be reduced.
- the wireless communication apparatus further includes an outlet for discharging the wireless tag circuit element, for which the access to the wireless tag information of the IC circuit section has been completed, in the access area to the outside of the apparatus.
- an outlet for discharging the wireless tag circuit element for which the access to the wireless tag information of the IC circuit section has been completed, in the access area to the outside of the apparatus.
- the outlet is arranged in a direction substantially perpendicular to the direction of the directivity of the directional antenna. In this way, by arranging the outlet in a direction in which the signal strength from the directional antenna becomes weaker, it is possible to suppress signal leakage to the outside of the device.
- the outlet is arranged in such a direction that the electric field strength thereof is smaller than that of the directional antenna by 10 dB or more than the electric field strength in the directional direction of the directional antenna.
- the outlet is arranged in a direction in which the direction of the electric field from the directional antenna and the electric field strength is reduced by 10 dB or more, it is possible to reliably suppress signal leakage to the outside of the device.
- the shield part is a plate-shaped member configured to have a size larger than a projected area of the RFID circuit element housing part viewed from the shield part. .
- the shield portion includes a side wall portion extending toward a side of the RFID circuit element storage portion and opposite to the microstrip antenna element.
- the side wall of the shield unit covers the RFID circuit element housing from the side, so that signals leaking to the RFID circuit element housing can be more reliably blocked and the shield unit can be shielded. Can secure the shielding effect more sufficiently
- the shield part has a substantially U-shape.
- the side wall of the shield portion having a substantially U-shape covers the RFID circuit element housing from the side, so that the signal leaking to the RFID circuit element housing is provided. Can be more reliably blocked, and the shielding effect of the shield portion can be more sufficiently secured.
- FIG. 1 is a diagram illustrating an RFID system to which the present invention is suitably applied.
- FIG. 2 is a diagram illustrating a configuration of a wireless tag reader / writer according to a first embodiment of the present invention.
- FIG. 3 is a diagram illustrating a configuration of a wireless tag according to an embodiment of the present invention.
- FIG. 4 is a plan view illustrating the appearance of the wireless tag of FIG. 3.
- FIG. 5 is a bottom view illustrating the appearance of the wireless tag of FIG. 3.
- FIG. 6 is a sectional view taken along line VV in FIG. 4.
- FIG. 7 is a diagram illustrating the configuration of the cartridge of FIG. 2 in detail.
- FIG. 8 is a diagram illustrating an electrical configuration of the sensor of FIG. 2.
- FIG. 9 is a diagram illustrating a configuration of a control circuit in FIG. 2.
- FIG. 10 is an example of a screen displayed on the terminal or general-purpose computer in FIG. 1 when writing information to a wireless tag by the wireless tag reader / writer in FIG. 2;
- FIG. 11 is a diagram illustrating the high-frequency circuit of FIG. 2 in detail.
- FIG. 12 is a diagram illustrating a change in resonance frequency when the distance between the transmission / reception antenna of the wireless tag reader / writer in FIG. 2 and the antenna of the wireless tag in FIG. 3 is changed.
- FIG. 13 is a diagram illustrating a change in resonance frequency when the distance between the transmission / reception antenna of the wireless tag reader / writer in FIG. 2 and the antenna of the wireless tag in FIG. 3 is changed, and each of these antennas is a linear element
- This example illustrates a single-wavelength dipole antenna with a length of 114 Omm, a cross-sectional radius of 0.5 mm, a resistance of 50 ⁇ , and a single-unit resonance frequency of 2.44 GHz.
- FIG. 14 is a flowchart illustrating an initialization operation of the wireless tag reader / writer in FIG. 2, which is executed prior to writing information to the wireless tag in FIG. 3 by the RFID system in FIG. 1.
- FIG. 15 is a flowchart illustrating an operation of initializing mechanical information of a wireless tag reader / writer in the SPA of FIG. 14.
- FIG. 16 is a flowchart illustrating a setting initialization operation of a carrier generation unit provided in a high-frequency circuit of the wireless tag reader / writer in the SPB of FIG.
- FIG. 17 is a flowchart illustrating an operation of writing information to the wireless tag of FIG. 3 by the wireless tag reader / writer of FIG. 2.
- FIG. 18 is a flowchart illustrating a preparation operation for writing information to a wireless tag in the SWA of FIG. 17.
- FIG. 19 is a flowchart illustrating generation of modulation information for transmitting information to the wireless tag in FIG. 3.
- FIG. 20 is a table showing types of commands determined by the command determination routine in FIG. 19.
- FIG. 21 is a diagram describing the command frame structure of FIG. 19 in detail.
- FIG. 22 is a view for explaining a 0 signal and a 1 signal which are components of the command frame in FIG. 19.
- FIG. 23 is a diagram illustrating a 0 signal and a 1 signal used for generating a reply signal from the wireless tag in FIG. 3.
- FIG. 24 is a diagram exemplifying a signal indicating an ID unique to the wireless tag of FIG. 3.
- FIG. 25 is a diagram showing a memory configuration of the wireless tag of FIG. 3.
- FIG. 11 is a diagram for describing “SCROLL ID ReplyJ” returned to “.
- FIG. 27 is a diagram explaining how information following “LEN”, which is a part of the information stored in the memory unit in FIG. 3, is extracted.
- FIG. 28 is a diagram explaining in detail “SCR @ LL ID R ly” in FIG. 26.
- FIG. 29 is a diagram exemplifying a possible reply state from the wireless tag when the wireless tag reader / writer in FIG. 2 performs an operation of identifying a wireless tag within a communication range.
- FIG. 30 is a diagram exemplifying a possible reply state from the wireless tag when the wireless tag reader / writer in FIG. 2 performs an operation of identifying a wireless tag within a communication range.
- FIG. 31 is a flowchart illustrating an operation of specifying a wireless tag to which information is to be written in the SWB of FIG. 17;
- FIG. 32 is a flowchart illustrating an operation of writing information to a wireless tag in the SWC in FIG. 17.
- FIG. 33 is a flowchart illustrating a printing operation on a cover film and a tag tape cutting operation performed in parallel with the operation of writing information to the wireless tag in the SWC of FIG. 17.
- FIG. 34 is a diagram illustrating another mode of a wireless tag to be communicated by the wireless tag reader / writer in FIG. 2.
- FIG. 35 is a diagram illustrating still another mode of the wireless tag to be communicated by the wireless tag reader / writer in FIG. 2.
- FIG. 36 is a conceptual configuration diagram showing a detailed structure of a wireless tag reader / writer according to a second embodiment of the present invention.
- FIG. 37 is a diagram showing the detailed structure of the cartridge shown in FIG. 36, as viewed from the direction of arrow III in FIG. 36.
- FIG. 38 is a functional block diagram showing detailed functions of a high-frequency circuit provided in the wireless tag reader / writer of FIG. 36.
- FIG. 39 is a flowchart showing a procedure for reading wireless tag information in the control executed by the control circuit.
- FIG. 40 is an explanatory view conceptually showing the radiation directivity of the device-side antenna.
- FIG. 41 is an explanatory diagram conceptually showing the radiation directivity of the antenna of the wireless tag circuit element to be read.
- FIG. 42 is an explanatory diagram conceptually showing the radiation directivity of the antenna of the wireless tag circuit element not to be read.
- FIG. 43 is a conceptual perspective view showing a modification in which a tray member is provided as a wireless tag circuit element storage section.
- FIG. 44 is a conceptual configuration diagram showing a detailed structure of a wireless tag reader / writer according to a third embodiment of the present invention.
- FIG. 45 is a conceptual configuration diagram showing a detailed structure of a wireless tag reader / writer according to a fourth embodiment of the present invention.
- FIG. 46 is a conceptual perspective view showing a modified example in which a tray member is provided as a wireless tag circuit element storage section.
- FIG. 47 is a plan view of the structure shown in FIG. 46.
- FIG. 48 is a flowchart showing a procedure for writing the RFID tag information in the control executed by the control circuit in a modification in which the RFID tag information is written to the IC circuit unit.
- FIG. 49 is a conceptual configuration diagram showing a detailed structure of a wireless tag reader / writer according to a fifth embodiment of the present invention.
- FIG. 50 is a side view showing the detailed structure of the cartridge shown in FIG. 49.
- FIG. 51 is a side view showing the detailed structure of the antenna shown in FIG. 49.
- FIG. 52 is a cross-sectional view illustrating a detailed structure of the antenna illustrated in FIG. 49.
- FIG. 53 is a diagram conceptually and simply showing the main components such as a main transport guide and a cartridge in the structure shown in FIG. 49.
- FIG. 54 is a diagram showing a modification including a ground plate having another shape.
- FIG. 55 is a bottom view showing a modification example of the manner of connecting the signal lines to the antenna and corresponding to the view as viewed in the direction C in FIG. 51.
- FIG. 56 is a conceptual diagram showing a detailed structure of a wireless tag reader / writer according to a sixth embodiment of the present invention.
- FIG. 57 is a diagram conceptually and simply showing the main components such as a main transport guide and a cartridge in the structure shown in FIG. 56.
- FIG. 58 is a view showing a modification including a shield plate of another shape.
- FIG. 1 is a diagram illustrating an RFID system 10 to which the first to eighth inventions are suitably applied.
- a plurality of wireless tag reader / writers 12 according to an embodiment of the first invention are connected to a route server 16, a terminal 18, a general-purpose computer 20, and a plurality of devices via a wired or wireless communication line 14. It is connected to the information server 22.
- the wireless tag reader / writer is a wireless tag information communication device that performs at least one of writing predetermined information to a wireless tag to be communicated and reading information stored in the wireless tag.
- FIG. 2 is a diagram illustrating the configuration of the wireless tag reader / writer 12.
- the wireless tag reader / writer 12 is for creating the wireless tag 24 shown in FIG. 4, and prints predetermined printing characters and the like as described later, and writes a desired write ID and article information to the IC circuit section 80.
- the RFID tag 24 can be immediately created by writing to the tag, for example, and a cover film 86 and an ink ribbon described later for generating the tag tape 26 serving as the base material of the wireless tag 24 98, an antenna 64, and a detachable force for accommodating a base tape 92 or the like arranged in a band at predetermined intervals by a wireless tag circuit element 24a including an IC circuit section 80
- the signal processing circuit 58 for reading out information, the cartridge motor driving circuit 32, the printing driving circuit 36, the sending roller driving circuit 42, the solenoid 48, the high frequency circuit 56, the signal processing circuit 58, etc.
- a control circuit 60 for controlling the driving of the tag reader / writer 12.
- the control circuit 60 is connected to the communication line 14 by an input / output interface 62.
- FIG. 3 is a diagram illustrating the configuration of the RFID circuit element 24a. As shown in FIG. 3, the wireless tag circuit element 24a transmits and receives signals to and from the transmitting / receiving antenna 54 of the wireless tag reader / writer 12 or to an interrogator different from the wireless tag reader / writer 12.
- the control unit 76 communicates with the wireless tag reader / writer 12 to control the storage of the predetermined information in the memory unit 72, and modulates and demodulates the carrier received by the antenna 64.
- the unit 74 modulates based on the information signal stored in the memory unit 72, and then executes basic control such as a control of reflecting back from the antenna 64 as a reflected wave.
- the antenna 64 is preferably a half-wave dipole antenna composed of a pair of linear elements.
- FIG. 4 is a plan view illustrating the appearance of the wireless tag 24.
- FIG. 5 is a bottom view of the wireless tag 24.
- a print 78 such as “RF-ID” indicating the type of the wireless tag 24 is printed on one surface (front surface) of the wireless tag 24.
- FIG. 6 is a sectional view taken along the line VV of FIG. 4.
- the IC circuit section 80 including 76 and the like is provided integrally with a colored base film 82 made of PET (polyethylene terephthalate) or the like, and the antenna 64 is printed on the surface of the base film 82 by printing or the like.
- a transparent cover film 86 is adhered to the front side of the base film 82 via an adhesive layer 84, and a release paper 90 is adhered to the back side via an adhesive layer 88.
- the print 78 is printed on the back surface of the cover film 86, that is, on the surface on the adhesive layer 84 side.
- the release paper 90 is peeled off and adhered by the adhesive layer 88.
- FIG. 7 is a diagram for explaining the configuration of the cartridge 28 in detail.
- the cartridge 28 has a first roll 94 on which a band-shaped base tape 92 on which the antenna 64 and the IC circuit section 80 are continuously arranged is wound, and a base thereof.
- a second roll 96 on which the cover film 86 having substantially the same width as the material tape 92 is wound, an ink ribbon roll 100 on which an ink ribbon 98 is wound, and a roll for winding the ink ribbon 98.
- the take-up roller 102 and the pressure roller 104 that presses the base tape 92 and the cover film 86 to feed the tape in the direction indicated by the arrow while adhering them are rotatable about their respective axes. Is provided.
- the ink ribbon roll 100 and the take-up roller 102 are disposed on the back side of the cover film 86, that is, on the side to be adhered to the base tape 92.
- the thermal head 34 comes into contact with the back surface of the cover film 86.
- the winding roller 102 and the pressure roller 104 are rotated in synchronization with each other in the direction indicated by the arrow by driving the motor 30 for the cartridge.
- a predetermined amount of light is applied to the back surface of the cover film 86, that is, the surface on the side adhered to the base tape 92.
- a character, a symbol, a bar code, or the like is printed, and after the printing is performed, the tag tape 26 is formed by being bonded to the base tape 92 by the pressure roller 104.
- predetermined information is written into each IC circuit section 80 provided on the tag tape 26 by the high-frequency circuit 56 or the like, and then the cutter 50 is cut into a predetermined length. And divided into individual wireless tags 24.
- FIG. 8 is a diagram illustrating an electrical configuration of the sensor 52.
- the sensor 52 is, for example, a transmission type photoelectric sensor including a light projector 106 and a light receiver 108. If the tag tape 26 or the wireless tag 24 is not provided between the light emitter 106 and the light receiver 108, the light output from the light emitter 106 is input to the light receiver 108, while the light emitted from the light emitter 106 and the light When the tag tape 26 or the wireless tag 24 is provided between the devices 108, the light output from the light projecting device 106 is blocked and the control output from the light receiving device 108 is inverted.
- FIG. 9 is a diagram illustrating the configuration of the control circuit 60.
- the control circuit 60 includes a central processing unit (CPU) 110, a ROM (Read Only Memory) 112, a RAM (Random Access Memory) 114, and the like.
- CPU central processing unit
- ROM Read Only Memory
- RAM Random Access Memory
- FIG. 10 is an example of a screen displayed on the terminal 18 or the general-purpose computer 20 when the wireless tag reader / writer 12 writes information to the wireless tag 24.
- a print character to be printed on the wireless tag 24 a write ID which is an ID unique to the wireless tag 24, and an article information stored in the information server 22.
- the address of the information and the storage address of the corresponding information in the route server 16 can be displayed on the terminal 18 or the general-purpose computer 20.
- the print characters are printed on the cover film 86 and information such as the write ID and article information is written on the IC circuit section 80.
- the correspondence between the ID of the wireless tag 24 and the information written in the wireless tag 24 is stored in the route server 16 so that it can be referred to as needed.
- FIG. 11 is a diagram illustrating the configuration of the high-frequency circuit 56 in detail.
- the high-frequency circuit 56 includes a transmitting unit 116 that transmits a predetermined signal to the wireless tag circuit element 24a, and a receiving unit 118 that receives a reflected wave from the wireless tag 24.
- the transmitter 116 includes a carrier generator 120 for generating a carrier for writing information to the wireless tag 24, and a carrier generator 120 based on the information signal supplied from the signal processing circuit 58.
- a carrier modulating unit 122 that modulates the carrier generated by (for example, amplitude modulation based on a TX-ASK signal), and a modulated wave amplifying unit 124 that amplifies the modulated wave modulated by the carrier modulating unit 122.
- the output of the modulated wave amplification unit 124 is transmitted to the transmission / reception antenna 54 via the coupler 126, transmitted from the transmission / reception antenna 54, and transmitted to the IC circuit unit 80 via the antenna 64 of the RFID circuit element 24a. Supplied.
- the reflected wave from the RFID circuit element 24 a received by the transmitting / receiving antenna 54 is input to the receiving unit 118 via the power bra 126.
- the receiving section 118 includes an LNA (Low Noise Amp) 128 for amplifying a signal received from the transmitting / receiving antenna 54 and a band pass for passing only a signal of a predetermined frequency band in the received signal amplified by the LNA 128.
- the signal processing circuit 58 is configured to include a filter 130 and a reception signal frequency conversion unit 131 that frequency-converts an output signal of the band-pass filter into a signal that can be processed by the signal processing circuit 58.
- the output of the received signal frequency conversion unit 131 is input to the signal processing circuit 58, demodulated by the signal processing circuit 58, and information related to modulation by the wireless tag circuit element 24a, that is, information stored in the memory unit 72. Is read.
- the mode switching unit 132 includes a near-field communication mode for communicating only with the wireless tag circuit element 24a within a predetermined near-field communication range, and a wireless tag circuit element 24a outside the near-field communication range. Switch to the remote communication mode for communicating with.
- the frequency setting unit 134 controls the frequency of the carrier generated by the carrier generation unit 120 of the high-frequency circuit 56 in the near-field communication mode, and the frequency of the carrier generated by the carrier generation unit 120 of the high-frequency circuit 56 in the remote communication mode. The frequency is set to a predetermined different frequency.
- FIG. 12 is a diagram for explaining a change in resonance frequency when the distance between the transmission / reception antenna 54 of the wireless tag reader / writer 12 and the tag-side antenna 64 of the wireless tag circuit element 24a is changed.
- a half-wave dipole antenna having a linear element length of 57. Omm, a cross-sectional radius of 0.5 mm, a resistance of 50 ⁇ , and a free space resonance frequency of 2.44 GHz is illustrated.
- the frequency of a normal carrier output from the high-frequency circuit 56 that is, an ideal carrier (hereinafter referred to as a basic carrier) for communication without considering a change in resonance frequency due to mutual coupling is approximately 2.44 GHz.
- the wavelength of this basic carrier is about 123 mm. As shown in FIG.
- the change in the resonance frequency is caused by the fact that the distance is 2 It fluctuates around the half-wave period, which is one-half wavelength, and shows a maximum value at the half-wavelength position (about 62 mm).
- the distance between the transmitting / receiving antenna 54 of the wireless tag reader / writer 12 and the tag-side antenna 64 of the wireless tag circuit element 24a is more than 10 minutes of the basic carrier, the distance is greater than the maximum value. This position is less than one wavelength (about 12 mm).
- FIG. 13 is a diagram illustrating a change in resonance frequency when the distance between the transmitting / receiving antenna 54 of the RFID tag reader / writer 12 and the tag-side antenna 64 of the RFID circuit element 24a is changed, as in FIG.
- these examples show a case where each of these antennas is a dipole antenna having a linear element length of 114. Omm, a cross-sectional radius of 0.5 mm, a resistance of 50 ⁇ , and a length of about one wavelength at 2.44 GHz.
- the change in the resonance frequency fluctuates in a period of about 62 mm, which is a half wavelength of the basic carrier, and the transmission and reception antenna 54 of the wireless tag reader / writer 12 and the antenna 64 of the wireless tag 24 described above.
- Position where the distance is one-half wavelength of the above basic carrier ( It can be seen that the maximum value is shown at about 62 mm), and the position that is closer to and exceeds the maximum value is the position where the distance is less than 1/10 wavelength (about 12 mm).
- the frequency setting unit 134 preferably sets the frequency of the carrier generated by the carrier generation unit 120 of the high-frequency circuit 56 in the near field communication mode to the transmission / reception antenna 54 of the wireless tag reader / writer 12 and the wireless
- the frequency of the tag circuit element 24a is set to a frequency higher than the resonance frequency at a position where the distance from the tag-side antenna 64 is one-half wavelength of the basic carrier wave, that is, 0.5 times the wavelength.
- the frequency of the carrier generated by the carrier generator 120 of the high-frequency circuit 56 in the remote communication mode is set to the frequency of the basic carrier.
- the distance between the transmitting / receiving antenna 54 of the wireless tag reader / writer 12 and the tag-side antenna 64 of the wireless tag circuit element 24a is equal to or less than one-tenth wavelength (about 12 mm) of the basic carrier, that is, 0.
- the range that is less than or equal to 1 is the near range, and the other range is the far range.
- the distance between the transmitting / receiving antenna 54 of the RFID tag reader / writer 12 and the tag-side antenna 64 of the RFID circuit element 24a is a half wavelength of the basic carrier wave.
- the resonance frequency is higher than the resonance frequency at the position (approximately 62 mm), in the near field communication mode, the sensitivity of the RFID circuit elements 24a in the above-mentioned proximity range is strong, and the sensitivity of the other RFID circuit elements 24a is weak. Thus, it is possible to reliably perform communication only with the wireless tag circuit element 24a within the proximity range.
- the distance between the transmitting / receiving antenna 54 of the RFID tag reader / writer 12 and the tag-side antenna 64 of the RFID circuit element 24a is one-twentieth wavelength of the basic carrier ( It can be seen that, at a position within about 6 mm), the resonance frequency is 1.03 times or more of 2.44 GHz, which is the free space resonance frequency of the wireless tag 24.
- the frequency setting unit 134 sets the frequency of the carrier generated by the carrier generator 120 of the high frequency circuit 56 in the near field communication mode to the frequency of the tag-side antenna 64 of the RFID tag circuit element 24a alone. Set a frequency that is at least 1.03 times the resonance frequency.
- the distance between the transmitting / receiving antenna 54 of the wireless tag reader / writer 12 and the tag-side antenna 64 of the wireless tag circuit element 24a is not more than 1/20 the wavelength of the basic carrier, that is, not more than 0.05 times the wavelength. Is the proximity communication range, and A range other than the above is a distant communication range.
- the wireless tag circuit element within the close range is generated.
- 24a has a high sensitivity, and the other RFID tag circuit elements 24a have low sensitivity, so it is possible to reliably communicate only with the RFID circuit elements 24a that are within the proximity range.
- the transmitting / receiving antenna of the wireless tag reader / writer 12 As shown in FIGS. 12 and 13, the transmitting / receiving antenna of the wireless tag reader / writer 12
- the resonance frequency is equal to the antenna frequency. It can be seen that the value is about 0.97 times that of 2.44 GHz, which is the resonance frequency of the single substance, and shows a minimum value.
- the near field communication range is determined by setting the frequency of a carrier generated by the carrier generator 120 of the high frequency circuit 56 in the near field communication mode to the transmission / reception antenna 54 of the wireless tag reader / writer 12 and the wireless tag.
- the radio at a position where the distance between the circuit element 24a and the tag-side antenna 64 is within a range of 0.2 to 0.4 times the wavelength corresponding to the resonance frequency of the tag-side antenna 64 of the wireless tag 24a alone.
- the resonance frequency of the tag-side antenna 64 of the tag circuit element 24a is set.
- the above-mentioned range that is, the distance between the transmitting / receiving antenna 54 of the wireless tag reader / writer 12 and the tag-side antenna 64 of the wireless tag circuit element 24a is equal to the resonance frequency of the single tag-side antenna 64 of the wireless tag circuit element 24a.
- the range in which the wavelength is 0.2 times or more and 0.4 times or less of the corresponding wavelength is defined as the near communication range, and the other more distant range is defined as the far communication range.
- the wireless tag circuit elements 24a in the close range are not sensitive to other wireless tags. Since the sensitivity of the circuit element 24a is weak, it is possible to reliably perform communication only with the RFID circuit element 24a within the proximity range.
- FIG. 14 shows how the RFID system 10 writes information to the wireless tag circuit element 24a.
- 5 is a flowchart for explaining an initialization operation of the wireless tag reader / writer 12, which is executed in advance.
- step hereinafter, step is omitted
- machine information of the wireless tag reader / writer 12 is initialized.
- SPB after the settings of the carrier generation unit 120 provided in the high frequency circuit 56 of the wireless tag reader / writer 12 are initialized, this routine is terminated.
- FIG. 15 is a flowchart illustrating an operation of initializing the machine information of the wireless tag reader / writer 12 in the SPA of FIG.
- SPA1 the presence or absence of the cartridge 28 is determined.
- SPA2 the type of the cartridge 28, that is, the width of the tag tape 26, the presence or absence of RFID, and the like are determined.
- SPA3 after it is determined whether or not the tag tape 26 of the cartridge 28 has been used up, this routine is terminated.
- FIG. 16 is a flowchart illustrating a setting initialization operation of the carrier generation unit 120 provided in the high-frequency circuit 56 of the wireless tag reader / writer 12 in the SPB of FIG.
- the signal TX-PWR which is supplied to the modulated wave amplifier 124 and determines the transmission signal strength, is turned off.
- the carrier frequency is set to the PLL (Phase Locked Loop) provided in the carrier generation unit 120, and the oscillation frequency of the VCO (Voltage Controlled Oscillator) also provided in the carrier generation unit 120 is set to the PLL.
- the present routine is terminated.
- FIG. 17 is a flowchart illustrating an operation of writing information to the wireless tag 24 by the wireless tag reader / writer 12.
- SWA preparations are made for writing information to the RFID circuit element 24a.
- SWB the wireless tag circuit element 24a to which information is to be written is specified.
- SWC after the information is written to the wireless tag circuit element 24a, the present routine is terminated.
- FIG. 18 is a flowchart illustrating a preparatory operation for writing information to the RFID circuit element 24a in the SWA of FIG.
- a write ID, article information, and the like which are information written to the wireless tag 24, are set. The correspondence of this information is determined before and after the writing of the information to the RFID circuit element 24a.
- the information is registered in the information server 22 via the communication line 14.
- a CRC (Cyclic Readundancy Check) code is calculated from the information set in SWA1.
- the this CRC code a signal for detecting an error in communication between the wireless tag circuit element 24a, for example, represented by a polynomial such x 16 + x 12 + x 5 + 1.
- the wireless tag reader / writer 12 calculates the CRC code from the received data, and similarly compares the received CRC code value with the calculation result to perform communication. Detect an error.
- the command frame is created based on the information set in SWA1, and then the present routine is terminated.
- FIG. 19 is a flowchart illustrating generation of modulation information for transmitting information to the wireless tag circuit element 24a.
- functions such as specifying the RFID tag circuit element 24a to which information is to be written or writing information to the RFID tag circuit element 24a are set.
- SWD2 a command corresponding to the function set in SWD1 is determined.
- SWD3, a command frame is created from the command determined by SWD2, the write information set by SWA1 in FIG. 18, the CRC code set by SWA2, and the like.
- SWD4 the command frame created in SWD3 is stored in the memory buffer of the control circuit 60.
- the signal processing circuit 58 generates a TX-ASK signal, which is modulation information based on the command frame stored in the memory buffer.
- FIG. 20 shows the types of commands determined by the commands in FIG.
- commands such as “PING” and “SCROLL ID” for reading the information stored in the wireless tag 24 are used.
- “ERASE ID” for initializing the information stored in the wireless tag 24
- PROGRAM ID for writing the information
- a command such as "VERIFY” for confirming the write, "L @ CK” for inhibiting writing of new information.
- FIG. 21 is a diagram for explaining in detail the command frame structure created by SWD3 in FIG. is there.
- the command frame has 2T as time for transmitting 1-bit information.
- the command frame forms a series of signals using the 0 signal, 1 signal, and transmission power on / off as shown in FIG.
- a TX-ASK signal which is modulation information based on the command frame, is transmitted by the high-frequency circuit.
- the carrier wave is supplied to the 56 carrier modulation unit 122, where the carrier is subjected to ASK modulation, and transmitted to the wireless tag 24.
- the wireless tag circuit element 24a Upon receiving the signal, the wireless tag circuit element 24a performs an operation of writing information to the memory unit 72 corresponding to the command, an operation of returning information, and the like.
- the reply information described in detail below is configured as a series of FSK-modulated signals including the 0 signal and the 1 signal shown in Fig. 23.
- the carrier is reflected and modulated based on the signal, and is returned to the wireless tag reader / writer 12.
- FIG. 25 is a diagram showing a memory configuration of the RFID circuit element 24a.
- the above-described calculation result of the CRC code, an ID unique to the wireless tag circuit element 24a, and a password are stored in advance.
- the calculation result of the 8-bit “PREAMBLE” signal represented by OxFE and the CRC code stored in the memory unit 72 is obtained.
- a reply signal is generated that also includes the result “CRC” and the “ID” power indicating the ID of the wireless tag 24.
- the "PING" command in Fig. 20 described above corresponds to the "CRC” and "ID” of the information stored in the memory section 72 of each of the RFID circuit elements 24a for the plurality of RFID circuit elements 24a.
- the reading is performed by designating a portion corresponding to “”, that is, a reading start position.
- the “PING” command includes a start address pointer “PTR”, a data length “LEN”, and a value “VAL”.
- Information As shown in FIG. 27, among the information stored in the memory unit 72, the “LEN” data after the “PTR” is equal to “VAL”, and in the case where the “PTR + LEN + 1” and subsequent 8-bit data power S reply signal. Of the information stored in the memory unit 72, the last “LEN” data after the "PTR” is equal to "VAL". In the case where the data is a reply target, the reply signal is low. Not generated.
- the return timing for the “PING” command of the wireless tag circuit element 24a is determined by the upper 3 bits of the replay signal, and is separated by the BIN pulse sent from the wireless tag reader / writer 12 following “PING”.
- the reply to the "PING" command differs depending on the number of tags as follows. That is, if there is no communicable wireless tag 24 within the communication range of the wireless tag reader / writer 12, no reply signal is returned as shown in "CASE1" of FIG. When there is one wireless tag circuit element 24a that can communicate within the communication range, as shown in “CASE2” in FIG. 29, for example, a reply signal indicating “ID1” is returned in the section of “bin3”. Is done. When there are two wireless tag circuit elements 24a that can reply in the communication range, as shown in “CASE3” of FIG. 30, for example, a reply signal indicating “ID1” is returned in the section of “bin0”.
- a signal indicating “ID2” is returned in the section of “bin2”.
- the number of replyable RFID circuit elements 24a and the ID of each RFID circuit element 24a can be determined. The information can be known, and information can be written to the wireless tag circuit element 24a to be written using the ID.
- FIG. 31 is a flowchart illustrating the specific operation of the RFID circuit element 24a to which information is written in the SWB of FIG.
- SWB3 the value “d” indicating the number of “PING” commands is set to “1”
- SWB4 the bin number “bn (d)” of “d” is set to “0”
- SWB5 a “PING” command frame is created and transmitted.
- SWB6 it is determined whether there is a reply signal in "bin (bn (d))", that is, "bin0".
- SWB6 determines whether the tag has 4 bits “0000” from the beginning of the memory unit 72, and the “SCROLL ID” command frame is generated in SWB11 based on this information.
- the CRC code and ID of the wireless tag 24 can be read.
- the SWB 12 calculates the CRC code of the read ID, compares the calculation result with the transmitted CRC code, and determines whether or not the result matches. It is determined whether such an ID is a valid ID. If the determination of SWB12 is affirmative, the read ID is determined to be a valid ID, and the process of SWB7 is executed after the ID data is stored in SWB21.
- SWB6 determines whether or not the bin number “dn (d)”.
- SWB8 it is determined whether or not the bin number “bn (d)” has reached “8” which is the total number of bin sections. If the determination of SWB8 is denied, the force S at which the processing of SWB6 and below is executed again, and if the determination of SWB8 is affirmative, SWd9 indicates the number of "PING" commands. Is determined to be “1”. If the processing of SWB9 is denied, “1” is added to “d” at SWB17, and “1” is added to “bn (d)” at SWB18.
- SWB6 below Is executed again, but if the judgment of SWB9 is affirmative, it means that all the data having the same head data in the memory section 72 have been confirmed, and thus the processing of SWB10 is executed. On the other hand, if the judgment of SWB12 is denied, it is considered that multiple tags respond in the section of "bin (bn (d))", and the "PING" command It is necessary to further separate the ID of the wireless tag circuit element 24a by creating and transmitting a “PING” command again based on the data determined by the above. In this case, first, the length of “LEN” is recalculated in SWB13.
- the SWB 14 it is determined whether or not the length of “LEN” exceeds the total number “MEM_MAX” stored in the memory unit 72. If the judgment of the SWB 14 is affirmative, it means that all the data in the memory unit 72 has been read out and there is an error in the data, and it is determined that the data in the memory unit 72 has some defect. In SWB22 without considering and storing ID data, if "1" is subtracted from “d” and the force to move to the determination of the next BIN section is denied, then the wireless tag circuit is further finely determined. In order to discriminate the ID of the element 24a, the value of “VAL” is changed in SWB15 based on the data determined by the “PING” command performed up to the previous time.
- SWB16 After “1” is added to “d”, the above-described processing of SWB4 and thereafter is executed again.
- VAL 1
- a tag that is not targeted is not responded to a subsequent command by using a “Quiet” command for which detailed description is omitted. Processing proceeds.
- the identification of the target tag is performed, for example, by judging from the one with the smallest detected ID number. If no wireless tag circuit element 24a is detected, the process is terminated as an error.
- FIG. 32 shows an operation of writing information to the wireless tag circuit element 24a in the SWC of FIG. It is a flowchart explaining a product.
- the memory section 72 of the target RFID circuit element 24a is initialized.
- SWC3 after the signal modulated based on the “VERIFY” command is transmitted from the transmitting / receiving antenna 54, in SWC4, the memory of the RFID circuit element 24a is converted from the reply signal by the RFID circuit element 24a.
- the information stored in the section 72 is confirmed, and it is determined whether or not the memory section 72 of the RFID circuit element 24a has been properly initialized. If the determination of SWC4 is affirmative, in SWC5, a signal modulated based on the “PROGRAM ID” command is transmitted from the transmission / reception antenna 54, and information is written to the wireless tag circuit element 24a. Next, in SWC6, after a signal modulated based on the "VERIFY” command is transmitted from the transmitting / receiving antenna 54, in SWC7, the reply signal from the RFID circuit element 24a is used to convert the The information stored in the memory unit 72 is checked, and it is determined whether or not the information matches the information written in SWC5.
- FIG. 33 illustrates a printing operation on the cover film 86 and a cutting operation of the tag tape 26 performed in parallel with an operation of writing information to the RFID circuit element 24a in the SWC of FIG. FIG.
- print / write information is downloaded or uploaded from the information server 22 via the communication line 14.
- a printing operation on the cover film 86 is performed via the cartridge motor driving circuit 32, the printing driving circuit 36, the sending roller driving circuit 42, and the like, and the sensor 52 is turned on.
- the tag tape 26 is sent out by the sending roller 38 or the like until the tag tape 26 is sent.
- an operation of writing information to the wireless tag circuit element 24a in the SWC is performed.
- the tag tape 26 is cut by the cutter 50 via the solenoid 48 and the like, and the wireless tag 24 divided by the sending roller 38 and the like is sent out until the sensor 52 is turned off. Then, in ST4, after it is confirmed that the printing and the information writing operation are successful, this routine is ended. According to the above routine, the wireless tag 24 on which predetermined printing is performed and predetermined information is written is generated.
- the tag-side antenna 64 of the wireless tag circuit element 24a in the wireless tag 24 and the wireless By setting the resonance frequency of the tag-side antenna 64 of the wireless tag circuit element 24a changed by the mutual coupling with the transmission / reception antenna 54 of the tag reader / writer 12 as the frequency of the carrier transmitted by the wireless tag reader / writer 12, the proximity Since it communicates only with the RFID tag circuit element 24a located within the communication range, the RFID tag circuit element 24a to be communicated within the proximity range is the other RFID tag circuit with high sensitivity. Since the sensitivity of the element 24a is weak, communication with the wireless tag circuit element 24a to be communicated is not possible. Interference with communication of the wireless tag circuit element 24a which is not the communication target can be suitably prevented. That is, it is possible to provide the wireless tag reader / writer 12 that reliably performs communication only with the target wireless tag circuit element 24a.
- the proximity communication range is determined by the distance between the transmitting / receiving antenna 54 of the RFID tag reader / writer 12 and the tag-side antenna 64 of the RFID circuit element 24a. This is a range that is 0.1 times or less of the wavelength corresponding to the spatial resonance frequency, and the distance between the transmitting / receiving antenna 54 of the wireless tag reader / writer 12 and the antenna 64 of the wireless tag 24 is the wavelength corresponding to the free space resonance frequency. Since a carrier having a frequency higher than the resonance frequency of the tag-side antenna 64 of the wireless tag circuit element 24a at the position of 0.5 times is generated, the capacitive / inductive change of the resonance frequency is as follows.
- the distance between the transmitting / receiving antenna 54 of the RFID tag reader / writer 12 and the tag-side antenna 64 of the RFID circuit element 24 is a half wavelength of the carrier having the free space resonance frequency.
- the maximum value is shown at a certain position, and the value exceeds the maximum value at a position where the distance is less than one-tenth the wavelength of the antenna itself.Therefore, communication is performed using the frequency and communication range in that range. By doing so, it is possible to more reliably perform communication only with the target RFID circuit element 24a.
- the wireless tag reader / writer 12 which reads and writes information by communicating with a wireless tag circuit element 24a having a half-wavelength dipole antenna as the tag-side antenna 64, Is a range in which the distance between the transmitting / receiving antenna 54 of the wireless tag reader / writer 12 and the tag-side antenna 64 of the wireless tag circuit element 24a is 0.05 times or less the wavelength corresponding to the free space resonance frequency. Since it generates a carrier wave with a frequency that is at least 1.03 times the spatial resonance frequency, a frequency that is at least 1.03 times the resonance frequency of the tag-side antenna 64 of the wireless tag circuit element 24a alone is generated.
- the distance between the transmitting / receiving antenna 54 of the wireless tag reader / writer 12 and the tag-side antenna 64 of the wireless tag circuit element 24a is a carrier having the free space resonance frequency. Since the sensitivity is high at the position where the wavelength is less than 1/20 wavelength, communication is performed using the frequency and communication range in that range, and the communication with the target RFID tag circuit element 24a is more reliably performed. Can communicate. [0103]
- the proximity communication range is defined as the distance between the tag-side antenna 64 of the RFID circuit element 24a and the transmitting / receiving antenna 54 of the RFID tag reader / writer 12 of the wavelength corresponding to the free-space resonance frequency.
- the wireless tag is located at a position where the distance between the tag-side antenna 64 of the wireless tag circuit element 24a and the transmitting / receiving antenna 54 of the wireless tag reader / writer 12 is within the range. Since the carrier wave having the resonance frequency of the tag-side antenna 64 of the circuit element 24a is generated, the carrier wave is generated by mutual coupling between the tag-side antenna 64 of the wireless tag circuit element 24a and the transmitting / receiving antenna 54 of the wireless tag reader / writer 12. The change in the resonance frequency of the tag-side antenna 64 of the wireless tag circuit element 24a depends on the transmission between the tag-side antenna 64 of the wireless tag circuit element 24a and the wireless tag reader / writer 12.
- the minimum value is shown in a range where the distance to the receiving antenna 54 is 0.2 times or more and 0.4 times or less of the wavelength corresponding to the free space resonance frequency, communication is performed using the frequency and the communication range in the range. By doing so, communication can be performed more reliably with only the target RFID circuit element 24a.
- a mode for switching between a near communication mode in which communication is performed only with the RFID circuit element 24a within the near communication range and a distant communication mode in which communication with the RFID circuit element 24a outside the near communication range is performed.
- a switching unit 132 is provided, and the frequency of the carrier generated by the carrier generation unit 120 in the short-range communication mode is different from the frequency of the carrier generated by the carrier generation unit 120 in the long-range communication mode. Since the frequency is set, the frequency of the carrier wave transmitted by the wireless tag reader / writer 12 inside and outside the close proximity communication range can be set, respectively, so that only the wireless tag circuit element 24a within the close proximity communication range can be set. Communication can be performed reliably, and it is possible to preferably communicate with the RFID circuit element 24a outside the close proximity communication range. Wear.
- FIG. 34 is a diagram for explaining another mode of the wireless tag to be communicated by the wireless tag reader / writer 12.
- the wireless tag 136 shown in FIG. 34 includes a microstrip antenna element 140 formed on the upper surface of a substrate 138 made of a high insulator or the like, a ground plate 142 formed on the lower surface, and a microstrip antenna formed on the lower surface.
- the wireless tag reader / writer 12 Can suitably communicate with such a wireless tag 136.
- various modes such as a circular marker as shown in FIG. 35 and a wireless tag provided with a Yagi antenna can be considered.
- the frequency of the carrier generated by the carrier generator 120 of the high-frequency circuit 56 illustrated in the above-described embodiment and the proximity communication range of the wireless tag reader / writer 12 are merely a preferred embodiment. Instead, the tag-side antenna 64 of the wireless tag circuit element 24a and the transmitting / receiving antenna 54 of the wireless tag reader / writer 12 change according to the resonance frequency of the tag-side antenna 64 of the wireless tag circuit element 24a. It is determined accordingly.
- the wireless tag reader / writer 12 writes information to the wireless tag circuit element 24a and performs printing for identifying the wireless tag 24 including the wireless tag circuit element 24a. This printing does not necessarily have to be performed, but it may be only writing or reading information.
- This embodiment is an embodiment in a case where the present invention is applied to a wireless tag generation system that can only read (not write). That is, in the present embodiment, a wireless tag reader that reads information from a wireless tag to be communicated will be described.
- Example 2
- FIG. 36 is a conceptual configuration diagram showing a detailed structure of the wireless tag reader 202 of the present embodiment.
- This wireless tag reader 202 is suitably used in the communication system 10 and the like in the above-described first embodiment, and a description of overlapping parts will be omitted.
- the wireless tag reader 202 has a detachable cartridge (wireless tag circuit element storage unit) 220 configured to house a plurality of wireless tag circuit elements 210A and to sequentially remove them. ing.
- the wireless tag circuit element 210A has the same configuration as the wireless tag circuit element 24a in the first embodiment described above, and In the embodiment, the description is omitted.
- FIG. 37 is a view showing the detailed structure of the cartridge 220 as viewed from the direction of arrow III in FIG.
- the cartridge 220 has a strip-shaped base tape (tape-shaped label material) 221 in which a plurality of RFID circuit elements 210A are sequentially formed in the longitudinal direction (details will be described later).
- a strip-shaped base tape (tape-shaped label material) 221 in which a plurality of RFID circuit elements 210A are sequentially formed in the longitudinal direction (details will be described later).
- the first roll (reel member) 222 the second roll 224 on which a transparent cover film 223 having substantially the same width as the base tape 221 is wound, and the ink ribbon 225 for printing.
- the wound ink ribbon roll 226, a winding roller 227 for winding the printed ink ribbon 225, and the base tape 221 and the cover film 223 are pressed and adhered to form a tag tape 228 with an arrow.
- a crimping port roller 229 for feeding the tape in the direction shown is provided to be rotatable around each axis.
- the take-up roller 227 and the pressure roller 229 are each driven to rotate by the driving force of a cartridge motor 230 (see FIG. 36), for example, a pulse motor provided outside the cartridge.
- the drive of the cartridge motor 230 is controlled by a cartridge drive circuit 231 (see FIG. 36).
- the base tape 221 has a four-layer structure as shown in a partially enlarged view in FIG. 37, and is opposite to the side (right side in FIG. 37) to which the cover film 223 is bonded later (in FIG. 37). To the left, the adhesive layer 232, a colored base film 233 made of PET (polyethylene terephthalate), etc., an adhesive layer 234, and a release paper 235 are laminated in this order.
- the RFID tag circuit element housing is constituted by the base tape 221 and the first roll 222.
- An IC circuit unit 300 is provided on the back side of the base film 233 (the left side in Fig. 37), and the tag side antenna 301 is formed on the back surface of the base film 233.
- the IC circuit unit 300 and the tag-side antenna 301 constitute a wireless tag circuit element 210A.
- the adhesive layer 232 for bonding the cover film 223 later is formed on the front side (the right side in FIG. 37) of the base film 233.
- the adhesive layer 234 On the back side of the base film 233, the adhesive layer 234 The release paper 235 is bonded to the base film 233.
- the release paper 235 is used when the completed wireless tag 210 is attached to a predetermined product or the like.
- the adhesive layer 234 can be adhered to the product or the like by peeling it off.
- the ink ribbon roll 226 and the take-up roller 227 are disposed on the back side of the cover film 223, that is, on the side to be bonded to the base tape 221.
- a thermal head 241 that is energized by the print drive circuit 242 (see FIG. 36) and prints (prints) on the cover film 223 is provided near the cartridge 220. By being pressed by 241, the cover film 223 can be brought into contact with the back surface of the cover film 223.
- the take-up roller 227 and the pressure roller 229 are rotated in synchronization with each other in the direction shown by the arrow by the driving of the cartridge motor 230, and the print drive circuit 242 controls the thermal head 241.
- a plurality of heating elements are energized.
- the tape is adhered to the base tape 221 by the pressure roller 229 to form a tag tape 228, and is wound out of the cartridge 220 via the conveyance guide 283 and carried out.
- the wireless tag reader 202 causes the tag tape 228 passing through the transport guide 283 to be connected to the wireless tag circuit element 210A provided on the tag tape 228.
- the device-side antenna 240 which transmits and receives signals by wireless communication using a high frequency such as the UHF band, and information (wireless tag information) of the IC circuit section 300 of the wireless tag circuit element 210A through the antenna 240
- a high-frequency circuit 251 for accessing (in this example, reading) and a signal read from the IC circuit section 300 of the RFID circuit element 210A are processed to read information, and the IC circuit section of the RFID circuit element 310A is read.
- a signal processing circuit 252 also functioning as an access information generation unit for generating access information for accessing the 300; a cartridge drive circuit 231; a print drive circuit 242; a high-frequency circuit 251; And processing circuitry 252, via the solenoid drive circuit 288 and sends the low la driving circuit 290 or the like to be described later, and a control circuit 260 for controlling the overall operation of the wireless tag reader-writer 202.
- the control circuit 260 is a so-called microcomputer, and detailed illustration is omitted. It is composed of a central processing unit CPU, ROM (Read Only Memory), RAM (Random Access Memory), etc., and performs signal processing according to a program pre-stored in ROM while using the temporary storage function of RAM. ing. Further, the control circuit 260 is connected to the communication line 14 in the above-described first embodiment by an input / output interface 261 and exchanges information with the route server 16, the terminal 18, the general-purpose computer 20, the information server 22, and the like. Interaction is possible.
- FIG. 38 is a functional block diagram showing detailed functions of the high-frequency circuit 251.
- high-frequency circuit 251 includes a transmitting section 253 that transmits a signal to wireless tag circuit element 210 A via antenna 240, a reflected wave received by antenna 240, and a reflected wave received by wireless tag circuit element 210 A. And a directional coupler 255.
- the transmitting unit 253 is a crystal unit that functions as a carrier generating unit that generates a carrier for accessing (reading in this example) the wireless tag information of the IC circuit unit 300 of the wireless tag circuit element 210A. 256, a PLL (Phase Locked Loop) 257, and a VCO (Voltage Controlled Oscillator) 258, and modulates the carrier generated by the carrier generator based on the signal supplied from the signal processing circuit 252 (for example, ⁇ TX_ASK '' A first mixer 271 functioning as a carrier modulation unit that performs amplitude modulation based on a signal), and a first amplifier 272 functioning as a modulation wave amplification unit that amplifies a modulation wave modulated by the first mixer 271.
- a carrier generating unit that generates a carrier for accessing (reading in this example) the wireless tag information of the IC circuit unit 300 of the wireless tag circuit element 210A.
- PLL Phase Locked Loop
- VCO Voltage Controlled
- the carrier generated by the carrier generator preferably uses a UHF band frequency, and the output of the first amplifier 272 is transmitted to the antenna 240 via the directional coupler 255 to be transmitted to the wireless tag. It is supplied to the IC circuit section 300 of the circuit element 210A.
- Receiving section 254 includes a second mixer 273 that multiplies a reflected wave received from RFID circuit element 210A by antenna 240 and a carrier wave generated by the carrier wave generating section, and a second mixer 273.
- a second amplifier 276 that receives an output through a band-pass filter 274, amplifies the output, and supplies the amplified signal to a first limiter 275, a reflected wave from the radio tag circuit element 210A received by the antenna 240, and the carrier wave generator.
- the third mixer 277 which is multiplied by a carrier having a phase force shifted by 0 ° after being generated, and the output of the third mixer 277 And a third amplifier 280 that inputs a force through a band-pass filter 278, amplifies the power, and supplies the amplified power to a second limiter 279.
- the signal “R XS-I” output from the first limiter 275 and the signal “RXS-Q” output from the second limiter 279 are input to the signal processing circuit 252 and processed.
- the outputs of the first amplifier 276 and the third amplifier 280 are RSSI (Received
- Signal RSSI 281 is also input to the signal processing circuit 252, and the signal “RSSI” indicating the strength of those signals is input to the signal processing circuit 252.
- demodulation of the reflected wave from the wireless tag 210 is performed by Q quadrature demodulation.
- the wireless tag reader / writer 202 is provided near the outlet of the cartridge 220, and reads wireless tag information from the IC circuit section 300 of the wireless tag circuit element 210A (or a write position, described later).
- the cutter 282 which cuts the tag tape 228 having been finished (see the modified example) to a predetermined length and divides it into each label-shaped wireless tag (wireless label) 224, and the reading (or writing, see the modified example described later)
- the cutter 282 is driven by a solenoid 287 to perform a cutting operation, and the solenoid 287 is controlled by a solenoid drive circuit 288.
- the delivery roller 285 is driven by a delivery roller motor 289, and the motor 289 is controlled by a delivery roller drive circuit 290.
- the sensor 286 is, for example, a transmission type photoelectric sensor including a light emitter and a light receiver. When the wireless tag 210 does not exist between the light emitter and the light receiver, the light output from the light emitter is input to the light receiver. On the other hand, when the wireless tag 210 exists between the light emitter and the light receiver, the light output from the light emitter is blocked, and the control output of the light receiver power is inverted.
- FIG. 39 shows the control executed by the control circuit 260 for the wireless tag circuit element 210A.
- 5 is a flowchart illustrating a procedure for reading the wireless tag information from the IC circuit unit 300.
- step S110 an operator N for counting the number of retries (retry) when a communication failure or the like is suspected is initialized to zero.
- step S120 a "Scroll All ID” command for returning HD information to all wireless tag circuit elements 210A within the accessible range is output to signal processing circuit 252. Based on this, a “Scroll All ID” signal as access information is generated by the signal processing circuit 252 and is accessible via the high-frequency circuit 251 (in this example, the readable range; in the present embodiment, as will be described later, this range). Is transmitted to the RFID tag circuit element 21 OA at the same time, and prompts a reply.
- the high-frequency circuit 251 in this example, the readable range; in the present embodiment, as will be described later, this range.
- step S130 the wireless tag circuit element 210A in the accessible range corresponding to the “Scroll All ID” signal is transmitted and the reply signal (the wireless tag information such as article information) is transmitted. ) Is received via the antenna 240, and is taken in via the high-frequency circuit 251 and the signal processing circuit 252.
- step S140 it is determined whether there is only one reply signal received in step S130.
- step S150 1 is added to N.
- step S140 When the determination in step S140 is satisfied, the reading of the RFID tag information from the RFID tag circuit element 21OA to be read is completed, and this routine ends.
- the RFID tag information of the IC circuit section 300 of the RFID circuit element 210A to be accessed can be accessed and read.
- the tag table moving the transport guide 283 along with the printing operation is described.
- the force shown in the example in which the server 228 is accessed while being held in the access area is not limited to this. That is, the above access may be performed with the tag tape 228 stopped at a predetermined position and held by the transport guide 283.
- the correspondence between the generated ID of the wireless tag 210 and the information read from the IC circuit unit 300 of the wireless tag 210 is stored in the above-described route server 16. It is stored and can be referred to as needed.
- the cartridge 220 includes all the wireless tag circuits housed therein (including those immediately after being taken out to the outside).
- the tag-side antenna 301 of the element 210A is located in the area where the directivity of the antenna 240 of the wireless tag reader 202 is substantially minimum (the so-called null direction area where the electric field strength of the antenna 240 is almost negligible.
- the element is arranged in a region substantially in the direction in which the element extends along the axis.
- the wireless tag circuit wrapped around the cartridge 220 as a tag tape 228 and set and held at a predetermined position (access area) facing the device-side antenna 240 by the transport guide 283
- the element 210A is sequentially accessed (in this example, reading of the wireless tag information of the IC circuit section 300). That is, the access information (the aforementioned Scroll All ID signal) generated by the signal processing circuit 252 of the wireless tag reader 202 is used by the first mixer 271 to modulate the carrier from the VC0258, and further by the first amplifier 272. After being amplified, it is transmitted from the device-side antenna 240 to the IC circuit unit 300 side of the wireless tag circuit element 21 OA in a non-contact manner.
- the access information the aforementioned Scroll All ID signal
- the following RFID circuit elements RFID circuit elements immediately after being unwound from the cartridge 220 immediately behind and other RFID circuit elements contained in the cartridge 220
- 224A Information may be read.
- the The wireless tag circuit element 210A which is not to be accessed (read) is located in a region where the directivity of the device-side antenna 240 is substantially minimized (a region in the so-called null direction).
- Fig. 40 is an explanatory diagram conceptually showing the above-mentioned positional relationship, taking as an example the above-mentioned RFID circuit element 210A that is not to be read (the one being about to be taken out of the cartridge 220 in this example). is there.
- the signal radiation pattern (radiation directivity) from the device-side antenna 240 is directed to the RFID tag circuit element 210A-0 to be read, but is not the RFID tag to be read.
- the circuit element 210A-1, the wireless tag circuit element 210A-2,... Are outside the directivity range R of the device-side antenna 240 and are almost in the null direction N.
- FIG. 42 show this from the opposite viewpoint, and are explanatory diagrams conceptually showing the signal radiation pattern from the tag-side antenna 301 of the wireless tag circuit element 210A-0 to be read. 41.
- FIG. 42 is an explanatory diagram conceptually showing a signal radiation pattern from the tag-side antenna 301 of the wireless tag circuit element 21 OA-1 not to be read.
- the radiation pattern of the tag-side antenna 301 of the wireless tag circuit element 210A-1 to be read is directed toward the device-side antenna 240, and the device-side antenna 240 is connected to the wireless tag circuit element 210A. — 0 is located within the directivity range R of the tag-side antenna 301.
- the device-side antenna 240 is out of the directivity range R and almost in the null direction N. There will be.
- the strength of the communication signal from the device-side antenna 240 is increased for the RFID circuit element 210A-0 to be read, while the RFID tag circuit element 210A-0 is stored in the cartridge 220 that is not to be read.
- the strength of the communication signal from the device-side antenna 240 is greatly reduced.
- communication is possible only with the wireless tag circuit element 210A-0.
- the wireless tag information of the IC circuit section 300 can be read only from the path element 210A-0.
- the first roll around which the band-shaped base tape 221 on which the plurality of RFID circuit elements 210A are sequentially formed in the longitudinal direction is wound.
- the case where the cartridge 220 provided with the 222 is provided has been described as an example, but the present invention is not limited to this, and another form of the RFID circuit element storage unit may be used.
- FIG. 43 is a conceptual perspective view showing such a modification.
- a substantially flat box-shaped tray member 291 is provided as a wireless tag circuit element storage portion.
- a plurality of flat paper-shaped label materials 292 each having one wireless tag circuit element 210 A formed thereon are stacked and stored in a flat stacking direction.
- a plurality of RFID circuit elements 210A can be taken out one by one by pulling out one sheet of label material 292 from the take-out opening 291A provided on the side of the tray member 291 (in this example, the back side in the figure). I have.
- the tray member 291 is placed so that the RFID circuit element 210A-0 immediately after being taken out is located at a position (directly below) the device-side antenna 240 provided in the wireless tag reader 202. Is arranged.
- the RFID circuit elements 210A-1, 1,..., Which are not to be read and stored in the tray member 291 are outside the directivity range of the device-side antenna 240 and are positioned in the null direction Na.
- the device-side antenna 240 is also located outside of the directivity range of the tag-side antenna 301 of the RFID tag circuit elements 210A-1, 210A in the null direction Nb thereof (that is, mutually null). Position).
- the strength of the communication signal from the device-side antenna 240 is increased for the RFID tag circuit element 210A-0 to be read, while the RFID tag circuit that is not to be read.
- the strength of the communication signal from the device-side antenna 240 (and to the device-side antenna 240) is greatly reduced, and communication is possible only with the RFID tag circuit element 210A-0. The effect of can be obtained.
- the present embodiment uses the difference in polarization plane between the device-side antenna and the tag-side antenna. It is an embodiment.
- the same parts as those in the above-described second embodiment are denoted by the same reference numerals, and description thereof will not be repeated.
- FIG. 44 is a conceptual configuration diagram showing a detailed structure of a wireless tag reader 202 ′ according to the present embodiment, and is a diagram corresponding to FIG. 36 in the above-described second embodiment. Note that the illustration of the transport guide 283 and the sensor 286 is omitted to avoid complication of the illustration.
- the present embodiment is different from the above-described second embodiment in the positional relationship between the cartridge 220 and the apparatus-side antenna 240 and the transport of the tag tape 228 after unwinding from the cartridge.
- the present embodiment is different from the above-described second embodiment in the positional relationship between the cartridge 220 and the apparatus-side antenna 240 and the transport of the tag tape 228 after unwinding from the cartridge.
- Direction
- the deflecting transport rollers 293 and 294 serving as deflecting transport units for transporting the tag tape 228 while transporting the tag circuit element 210 A in the course of transport are provided. Is provided. Then, in this example, the tag tape 228 conveyed from the cartridge 220 to one side in the substantially horizontal direction (the right side in FIG. 44) is first turned downward (turned) by the turning / conveying roller 293, and is cut by the cutter 282. After that, it is turned upward (turned) so as to be folded by the turning conveyance roller 294 further downward, and is set in the access area in the vertical direction so as to face the device-side antenna 240 arranged substantially in the vertical direction. The reading of the information from the wireless tag circuit element 210A-0 is completed, and the wireless tag 210 cut by the cutter 282 is further discharged by a sending-out roller 285 through a carry-out port 284 provided above.
- the plane of polarization is twisted with respect to each other, and a transport route that forms approximately 90 ° is realized.
- the cartridge 220 and the device-side antenna 240 are separated from the tag-side antenna 301 of the RFID circuit elements 210A-1, 210A-1 (including those immediately after being taken out), which are housed inside the cartridge 220 (including those immediately after being taken out).
- the wavefront and the plane of polarization of the device-side antenna 240 of the wireless tag reader 202 ' are arranged so that they are twisted with each other and make an angle of about 90 ° (the projected cross-sectional area is reduced). It is.
- the tag-side antenna 301 such as the wireless tag circuit element 210A-1 and the tag-side antenna 301 Since the strength of the communication signal between the tag reader 202 ′ and the device-side antenna 240 can be significantly reduced (almost impossible communication), erroneous access to the RFID tag circuit element 210A-1 or the like that is not a read target (error Readout) can be more reliably prevented. Therefore, even when using a high frequency such as the UHF band, the simple structure and simple method described above can be used to construct a shielded environment and reduce the output power as in the conventional method. It is possible to read the RFID tag information of the IC circuit unit 300 only from the RFID tag circuit element 210A-0 to be read out without requiring the data.
- the present embodiment is an embodiment that utilizes both the antenna directivity characteristics according to the above-described second embodiment and the antenna polarization plane characteristics according to the third embodiment.
- the same parts as those in the above-described second and third embodiments are denoted by the same reference numerals, and description thereof will not be repeated.
- FIG. 45 is a conceptual configuration diagram showing a detailed structure of the wireless tag reader 202 ”according to the present embodiment, and corresponds to FIG. 36 in the above-described second embodiment and FIG. 44 in the third embodiment. It should be noted that, similarly to FIG. The illustration of the sensor 286 is omitted.
- a turning transfer roller 295 is provided as a turning transfer section for transferring the tag tape 228 while turning the direction of the RFID circuit element 210 A during the transfer.
- the tag tape 228 conveyed from the cartridge 220 to one side in the substantially horizontal direction (the left side in FIG. 45) is turned upward (turned) by the conveying rollers 295, and is directly cut.
- the access area is set up and down in the vertical direction so as to face the device-side antenna 240 that is arranged in the up and down direction.
- the wireless tag 210 that has been removed is further discharged by a carry-out port 284 provided above by a delivery roller 285.
- the wireless tag 210 is moved to a take-out position from the cartridge 220.
- the polarization surface of the tag-side antenna 301 of the wireless tag circuit element 210A-1 and the wireless tag circuit element 210A-0 held by the guide 283 (not shown in FIG. 45) and held at a position facing the device-side antenna 240
- the plane of polarization and the force between the two are twisted with each other, and a carrier rate of approximately 90 ° is realized.
- the RFID tag circuit elements 210A-1, 210A-1 (including those immediately after being taken out to the outside) housed inside the cartridge 220,
- the polarization plane of the tag-side antenna 301 of the tag-side antenna 301 and the polarization plane of the apparatus-side antenna 240 of the wireless tag reader 202 "are twisted with each other and are approximately 90 °.
- the tag-side antenna 301 such as the RFID circuit element 210A-1 housed in the cartridge 220 (including the one immediately after being taken out) has the directivity of the device-side antenna 240 of the wireless tag reader 202 ⁇ . It is arranged so that it is the area that is almost the minimum (the area in the so-called null direction No).
- the wireless tag circuit element 210A-1 or the like stored in the cartridge 220 which is not to be read or immediately after being removed is located in the null direction area outside the directivity of the device-side antenna 240, thereby making the device-side antenna 240 (And antenna 240 on the device side)
- the strength of the communication signal is greatly reduced.
- the tag-side antenna 301 such as the wireless tag circuit element 210A-1 and the like can be used.
- the strength of the communication signal between the wireless tag reader 202 and the device side antenna 240 can be significantly reduced (almost impossible communication). Therefore, it is possible to more reliably read information only from the RFID tag circuit element 210A-0 to be read than in the second and third embodiments described above.
- the configuration of another wireless tag circuit element housing section is used as the wireless tag circuit element housing section. OK.
- FIG. 46 is a conceptual perspective view showing such a modification
- FIG. 47 is a plan view thereof. However, some illustrations are omitted for the sake of simplicity.
- a substantially upright thin box-shaped tray member is provided as a wireless tag circuit element storage portion.
- a plurality of flat paper-shaped label materials 292 'each having one RFID circuit element 210A formed thereon are stacked and stored in a flat stacking direction (vertical direction in FIG. 47).
- a flat stacking direction vertical direction in FIG. 47.
- the RFID tag circuit element 210A-0 immediately after being taken out is turned (turned) by 90 ° to the right in the conveying direction by the turning conveyance roller 295 ′ as a turning conveyance section, and the RFID tag reader is read. It is located at a position facing the antenna 240 provided on the writer.
- the wireless tag circuit elements 210A-1, 1, ... which are not read out and are accommodated in the tray member are outside the directivity range of the device-side antenna 240 and have null directions N ( And the tag-side antenna 301 and the antenna 240 have a polarization plane force of 0 ° with respect to each other, as in the fourth embodiment described above.
- Information can be read only from the wireless tag circuit element 210A-0
- the RFID tag circuit element housing The tag antenna 301 of all the RFID tag circuit elements 210 A-1, 1,...
- the tag-side antenna 301 of the wireless tag circuit element 210A-1 which is not a target, has a relatively low antenna sensitivity of the device-side antenna 240 of the wireless tag reader 202, for example, the electric field strength from the device-side antenna 240 is to be read.
- the RFID tag circuit element housing (cartridge 220 or tray member 291 or tray member) should be located in an area where the electric field strength at the position (access area) where the RFID tag circuit element 210A-0 is placed (access area) is 1/10 or less. 291 ') is sufficient.
- the device-side antenna 240 of the wireless tag reader 202 is connected to an area where the antenna sensitivity of the tag-side antenna 301 of the wireless tag circuit elements 21 OA-1, 1,... (The area where the strength of the reflected electric field from the antenna 301A is 1/10 or less of the strength of the reflected electric field from the tag-side antenna 301 of the wireless tag circuit element 210A-0 to be read) Good. In this case, a similar effect is obtained.
- the RFID circuit element 21 of the RFID circuit element housing portion (the cartridge 220) is not used.
- OA-1 The force in which the polarization plane of the tag-side antenna 301 of the tag antenna 202 and the polarization plane of the apparatus-side antenna 240 of the wireless tag reader 202 are arranged at 90 ° in a twisted position with respect to each other. Absent.
- the polarization planes of the tag-side antenna 301 of OA-1 and the tag-side antenna 301 of the wireless tag reader 202 and the device-side antenna 240 of the wireless tag reader 202 do not coincide with each other and are slightly displaced. Rank It is enough if it is in place. In this case, as described above, the larger the angle between the polarization planes (defined by the projection cross section), the lower the communication signal strength becomes. Therefore, the communication signal strength is reduced by half compared to the case where the polarization planes match.
- the angle be 60 ° or more (90 ° or less).
- Such a configuration can be easily realized by, for example, adjusting the turning angle of the turning conveyance roller 293 and the turning conveyance roller 294 as the turning conveyance section, or the turning conveyance roller 295 or the turning conveyance roller 295 ′.
- the wireless tag circuit element housing portion may be a modification of the second embodiment shown in FIG. 43 or a fourth embodiment shown in FIGS. 46 and 47. It goes without saying that a so-called stack type such as the tray member 291 or the tray member 291 ′ of the modified example may be used.
- the present invention is applied to a generation system of a read-only (not writable) wireless tag has been described as an example.
- the present invention is not limited to this.
- the present invention may be applied to a wireless tag generation system that writes wireless tag information into the IC circuit section 300 of the wireless tag circuit element 210A.
- the high-frequency circuit 251 performs a function of performing wireless tag information access (writing) of the IC circuit unit 300 of the wireless tag circuit element 210A via the device-side antenna 240
- the crystal unit 256, the PLL 257, and the VC0258 of the transmission unit 253 function as a carrier generation unit that generates a carrier wave for accessing (writing) the wireless tag information of the IC circuit unit 300.
- the signal processing circuit 252 functions as an access information generation unit that generates access information (an “Erase” signal, a “Verify” signal, a “Program” signal, etc., which will be described later) for accessing the IC circuit unit 300.
- the terminal 18 or the general-purpose computer 20 has access to the print character 243 and the RFID tag circuit element 210A (in this case, Is displayed)
- the ID, the address of the article information, and the storage address of the corresponding information are displayed.
- the wireless tag reader 202 is operated by the operation of the terminal 18 or the general-purpose computer 20, and the print characters 243 are printed on the cover film 223, and the information such as the write ID and the article information is written in the IC circuit section 300. It is.
- FIG. 48 is a diagram showing a wireless timer among the controls executed by the control circuit 260 in this modification.
- 6 is a flowchart showing a procedure for writing wireless tag information to an IC circuit unit 300 of a switching circuit element 210A.
- step S210 operators N and M for counting the number of retries (retry) when a communication failure or the like is suspected are initialized to 0.
- an “Erase” command is output to the signal processing circuit 252.
- an “Erase” signal as access information is generated by the signal processing circuit 252 and transmitted to the wireless tag circuit element 210A to be accessed (written in this example) via the high frequency circuit 251 and its memory unit 72 Is initialized.
- step S230 a "Verify" command is output to the signal processing circuit 252.
- a “Verify” signal as access information is generated in the signal processing circuit 252 and transmitted to the wireless tag circuit element 210A to which information is to be written via the high frequency circuit 251 to prompt a reply.
- a reply signal transmitted from the RFID circuit element 210A to be written in response to the "Verify” signal is received via the antenna 240, and is received via the high-frequency circuit 251 and the signal processing circuit 252.
- step S250 based on the reply signal, the information in the memory unit 72 of the RFID circuit element 210A is confirmed, and it is determined whether or not the memory unit 72 has been normally initialized.
- step S260 1 is added to M
- step S250 If the determination in step S250 is satisfied, the process moves to step S290, and outputs a “Program” command to the signal processing circuit 252. Based on this, the signal processing circuit 252 generates a “Program” signal as access information, which is predetermined information to be written originally, is transmitted to the wireless tag circuit element 210A to which information is to be written via the high-frequency circuit 251 and stores the signal in the memory. The predetermined information is written in the section 72.
- step S300 a "Verify” command is output to the signal processing circuit 252.
- a “Verify” signal as access information is generated in the signal processing circuit 252 and transmitted to the wireless tag circuit element 210A to which information is to be written via the high frequency circuit 251 to prompt a reply.
- step S310 a reply signal transmitted from the RFID circuit element 210A to be written in response to the “Verify” signal is received via the antenna 240, and is received via the high-frequency circuit 251 and the signal processing circuit 252.
- step S320 based on the reply signal, the information stored in the memory unit 72 of the RFID circuit element 210A is confirmed, and the transmitted predetermined information is normally stored in the memory unit 72. The stored power is determined.
- step S330 1 is added to N.
- Step S320 If the determination at Step S320 is satisfied, the process moves to Step S350, and outputs a "Lock” command to the signal processing circuit 252. Based on this, a “Lock” signal is generated by the signal processing circuit 252 and transmitted to the wireless tag circuit element 210A to which information is to be written via the high-frequency circuit 251 and new information is written to the wireless tag circuit element 21OA. Is prohibited and this routine ends.
- desired information can be written to the IC circuit section 300 of the wireless tag circuit element 210A to be written.
- the RFID tag circuit element storage section (the RFID tag element storage section in the second to fourth embodiments or their modifications described above)
- the device can be used for the RFID tag circuit element 21 OA-0 to be written. From side antenna 240 The strength of the communication signal increases.
- the RFID circuit elements 210A-1, 210A-2,..., which are stored in the cartridge 220 or the like that is not to be written or have just been removed, are sent from the apparatus antenna 240 (and the apparatus).
- the communication signal strength (to the side antenna 240) is greatly reduced, and communication is possible only with the RFID circuit element 210A-0. Therefore, as described above, even when a high frequency such as the UHF band is used, the shielded environment and the small-output identification communication and the like can be constructed by the simple structure and the simple method as described above.
- the wireless tag information can be written into the IC circuit section 300 only for the wireless tag circuit element 21 OA_0 to be written without the need for the method described above.
- the RFID tag circuit element storage section is not limited to a removable RFID tag reader / writer such as a cartridge or a tray member, but cannot be attached to or detached from the apparatus main body. It is possible to use one type or one type. In this case, the same effect is obtained.
- the wireless tag reader 202, the wireless tag reader 202 ', and the wireless tag reader 202 # read or write wireless tag information from the IC circuit unit 300 of the wireless tag circuit element 210A.
- the force S used to perform printing for identifying the RFID circuit element 210A may be such that the printing is not necessarily performed and only the reading or writing of the RFID information may be performed.
- FIG. 49 is a conceptual configuration diagram showing a detailed structure of a wireless tag reader / writer 402 according to an embodiment of the seventh invention.
- the wireless tag reader / writer 402 is suitably used in the communication system 10 and the like in the above-described first embodiment, and a description of overlapping parts will be omitted. Further, in the following description, the same parts as those in the above-described first to fourth embodiments are denoted by the same reference numerals, and the description will be appropriately omitted.
- the apparatus main body 408 of the wireless tag reader / writer 2 is provided with a cartridge holder (not shown) as a recess, and the cartridge 500 is detachably attached to the holder. It is attached.
- the apparatus main body 408 performs predetermined printing (printing) on the housing 409, which includes the above-mentioned cartridge holder portion for fitting the cartridge 500, and forms an outer shell, and the cover film 503 (see Fig. 50 described later).
- Print head (thermal head) 410 ribbon take-up roll drive shaft 411 that drives the ink ribbon that has finished printing on cover film 503, and tape feed to feed tag tape 510 with print out from cartridge body 500 force
- An antenna 414 for transmitting and receiving signals by wireless communication using a high frequency such as a UHF band between the roller drive shaft 412 and the RFID circuit element To (to be described in detail later) provided on the printed tag tape 510;
- a cutter 415 that cuts the printed tag tape 510 to a predetermined length at a predetermined timing to generate a label-shaped wireless tag T,
- a pair of the main transport guides 413 for setting and holding the wire tag circuit element To in a predetermined access area facing the antenna 414 and guiding each wireless tag T after cutting, and the guided wireless tag T
- Roller 417 for transporting and sending the sheet to a discharge port (discharge port) 416, a sensor 418 for detecting the presence or absence of the wireless tag T at the discharge port 416, and a pair provided between the cutter 415 and
- the sensor 418 is, for example, a transmission type photoelectric sensor including a light emitter and a light receiver. If the wireless tag T does not exist between the transmitter and the receiver, the light output from the transmitter is input to the receiver. On the other hand, when the wireless tag T exists between the light emitter and the light receiver, the light output from the light emitter is blocked and the control output from the light receiver is inverted.
- the device body 408 also includes a high-frequency circuit 421 for accessing (performing reading or writing) to the RFID circuit element To via the antenna 414, and a signal read from the RFID circuit element To. 422, a cartridge motor 423 for driving the above-described ribbon winding roll drive shaft 11 and the tape feed roller drive shaft 412, and a cartridge drive for controlling the drive of the cartridge motor 423.
- a circuit 424, a print drive circuit 425 for controlling the energization of the print head 410, and the cutter A solenoid 426 for driving the cutting 415 to perform a cutting operation, a solenoid driving circuit 427 for controlling the solenoid 426, a motor 428 for a delivery roller for driving the delivery roller 417, and a motor 428 for the delivery roller.
- the control circuit 430 is a so-called microcomputer, and although not shown in detail, comprises a central processing unit (CPU), ROM, RAM, and the like. The signal processing is performed in accordance with a program stored in advance.
- the control circuit 430 is connected to the communication line described in the first embodiment via the input / output interface 431, and the route server 16, the other terminals 18, and the general-purpose terminals connected to the communication line. Information can be exchanged between the computer 20, the information server 22, and the like.
- FIG. 50 is a side view showing the detailed structure of the cartridge 500.
- the cartridge 500 includes the first roll 502 on which the strip-shaped base tape 501 (tag tape; tape-shaped label material) is wound, and the same width as the base tape 501.
- the second roll 504 on which the transparent cover film 503 is wound, the ribbon supply roll 511 for feeding out the ink ribbon 505, and the ribbon winding roll 506 for winding the printed ribbon 505;
- a tape feed roller 507 that presses and adheres the base tape 501 and the cover film 503 to form a printed tag tape 510 and feeds the tape in the direction indicated by the arrow.
- the first Lonore 502 is formed by winding the base tape 501 on which a plurality of RFID circuit elements To are sequentially formed in the longitudinal direction around a Lynole member 502a.
- the cover film 503 is wound around the notch member 504a.
- the ribbon take-up roll 506 and the tape feed roller 507 are driven by the drive force of the cartridge motor 423 (see Fig. 49 described above), which is, for example, a pulse motor provided outside the cartridge 500.
- the rotation is driven by being transmitted to the shaft 411 and the tape feed roller drive shaft 412.
- the base tape 501 wound around the first roll 502 has a four-layer structure in this example (see a partially enlarged view in Fig. 50), and is wound from the inner side (the right side in Fig. 50).
- the adhesive layer 501a, a 50-lb base colored finolem made of PET (polyethylene terephthalate), etc., the adhesive layer 501c, and the release paper 50 Id are laminated in this order. I have.
- An IC circuit unit 551 for storing information is integrally provided on the back side (the left side in Fig. 50) of the base film 501b, and is connected to the IC circuit unit 551 on the back surface of the base film 501b.
- a tag-side antenna 552 for transmitting and receiving information is formed, and the IC circuit section 551 and the tag-side antenna 552 constitute a wireless tag circuit element To.
- the adhesive layer 501a for bonding the cover film 503 later is formed, and on the back side of the base film 501b, the adhesive layer 501c is used.
- the release paper 501d is adhered to the base film 501b.
- the wireless tag T finally completed in the form of a label is affixed to a predetermined product or the like, the release paper 501d is peeled off so that it can be adhered to the product or the like by the adhesive layer 501c. It was done.
- the cover film 503 unwound from the second roll 504 is provided by a ribbon supply roll 511 and a ribbon take-up roll 506 disposed on the back side (ie, the side to be bonded to the base tape 501).
- the ribbon 505 to be driven is pressed against the print head 410 to be brought into contact with the back surface of the cover film 503.
- the cover film 503 and the ink ribbon 505 are attached to the print head 410 and the platen roller 508.
- the base tape 501 and the cover film 503 are sandwiched between the tape feed roller 507 and the sub-roller 509. Then, the ribbon take-up roll 506 and the tape feed roller 507 are rotated by the driving force of the cartridge motor 423 in the directions indicated by arrows, respectively.
- the tape feed roller drive shaft 412, the sub-roller 509, and the platen roller 508 are connected by gears (not shown), and the tape feed roller 507 and the sub-roller are driven by the drive of the tape feed roller drive shaft 412. 509 and platen roller 508 rotate,
- the base tape 501 having a two-strength four-layer structure is fed out.
- the cover film 503 is fed out from the second roll 504, and a plurality of heating elements of the print head 410 are energized by the print drive circuit 425.
- the base tape 501 having the four-layer structure and the cover film 503 on which the printing has been completed are adhered and integrated by the tape feed roller 507 and the sub-roller 509, formed as a tag tag 510 with print, and formed into a cartridge. It is carried out out of 500.
- the ink ribbon 505 having been printed on the cover film 503 is wound around the ribbon winding roll 506 by driving the ribbon winding roll drive shaft 411.
- the detailed function of the high-frequency circuit 421 is the same as the configuration described with reference to Fig. 38 in the above-described second to fourth embodiments, and a description thereof will be omitted in this embodiment.
- the functional configuration of the RFID circuit element To provided on the printed tag tape 510 is the same as the configuration described with reference to FIG. 3 in the above-described first embodiment, and thus, in this embodiment, The description is omitted.
- the procedure for reading the RFID tag information from the IC circuit section 551 of the RFID tag circuit element To is the same as that of FIG. 39 in the second to fourth embodiments described above. Since this is the same as that described with reference to the flowchart, description of this embodiment will be omitted.
- the most significant feature of the wireless tag reader / writer 402 of the present embodiment is that, as shown in FIG. A microstrip antenna (directional antenna) having directivity is provided, the main transport guide 413 is arranged on the side of the directivity direction (left side in FIG. 49) of the device side antenna 414, and the cartridge 500 is moved from the device side antenna 414. It is located on the opposite direction (right side in Fig. 49). Further, on the side of the directivity direction (left side in FIG. 49) of the apparatus-side antenna 414 of the main transport guide 413, a shield portion (shield plate) 450 for reducing the communication signal strength of radio waves is provided. Note that the shield portion may be a net-like or stripe-like shape, a metal plating, or the like, as long as it is sufficient to prevent the electromagnetic wave from leaking to the outside.
- FIG. 51 is a side view showing the detailed structure of antenna 414
- FIG. 52 is a sectional view thereof.
- the device-side antenna 414 includes a circular microstrip antenna element 414A having a radius of about a half wavelength on one side (upper side in the figure), and the other side (upper side in the figure).
- the base plate 414B is provided on the lower side), and a dielectric 414C is provided in the middle so as to be sandwiched between them.
- Through holes 414Ba and 414Ca are provided at positions approximately 1/4 wavelength away from the radial center of the base plate 414B and the dielectric 414C, respectively, and one end is connected to the high frequency circuit 421 (Fig. 49).
- the center conductor 449a at the other end of the coaxial cable 449 serving as a feeder to the device-side antenna 414 is provided at a position approximately 1/4 wavelength away from the radial center of the microstrip antenna element 414A. Extends and connects to point P. Note that the microstrip antenna element 414A may be square.
- FIG. 53 is a diagram conceptually and simply showing the main components such as the main transport guide 413 and the cartridge 500 in the structure shown in FIG. 49.
- the main transport guide 413 and the cartridge 500 are arranged at positions such that the main transport guide 413 is disposed on the microstrip antenna element 414A side, and the force cartridge 500 including the first roll 502 is disposed on the base plate 414B side. ing.
- the dimension D1 in the direction along the longitudinal direction of the tag-side antenna 552 is smaller than the longitudinal dimension D2 of the antenna 552.
- the carry-out port 416 is disposed so as to be located substantially perpendicular to the direction of the directivity of the apparatus-side antenna 414 (vertical direction in the figure), and the main plate 414B has a size (area) A1 It is configured to be larger than the projected area A2 of the first roll 502 in the cartridge 500 as viewed from the apparatus side antenna 414 side.
- the first roll 502 constitutes a wireless tag circuit element storage section configured to store a plurality of wireless tag circuit elements described in each claim and to be able to sequentially take out the wireless tag circuit elements.
- a wireless tag circuit element holding section is configured to hold wireless tag circuit elements sequentially taken out of the circuit element storage section in a predetermined access area for accessing wireless tag information from a directional antenna.
- the wireless tag circuit element taken out as a printed tag tape 510 from the cartridge 500 and set and held at a predetermined position (access area) facing the device-side antenna 414 by the main transport guide 413 To is sequentially accessed (in this example, reading of the wireless tag information of the IC circuit unit 551). That is, as shown in FIG. 38 described above, the access information (the above-mentioned Scroll All ID signal) generated by the signal processing circuit 422 of the wireless tag reader / writer 402 is used by the first mixer 271 to transmit the carrier wave from the VC0258.
- a microstrip antenna having directivity in one direction is used as the device-side antenna 414, and A transport guide 413 is provided to form an access area, and a cartridge 500 containing a plurality of RFID circuit elements To is arranged on the side opposite to the directionality of the directional antenna.
- the antenna sensitivity from the device-side antenna 414 is high for the wireless tag circuit element To held in the access area, and the strength of the wireless communication signal is increased (see area B in FIG. 53).
- the antenna sensitivity from the device-side antenna 414 is low with respect to the wireless tag circuit element To and the discharge port 416 stored in the first roll 502, and the strength of the wireless communication signal is reduced.
- the microstrip antenna element 414A and the tag-side antenna 552 of the RFID tag circuit element To are close to each other, and when signals are transmitted and received between them, the microstrip antenna element in the directivity direction is used.
- the length in the longitudinal direction of the tag-side antenna 552 is longer than D2, and the radiation from the part is likely to leak without being transmitted to or received from the tag-side antenna 552, and therefore does not contribute much to the transmission and reception of signals.
- the longitudinal dimension D1 of the microstrip antenna element 414A is shorter than the dimension D2 of the tag-side antenna 552, so that signals can be transmitted and received efficiently. be able to.
- the size (area) A1 of the base plate 414B is larger than the projection area A2 of the first roll 502 viewed from the apparatus-side antenna 414. As a result, the signal leaking to the cartridge 500 side can be reliably blocked, and the wraparound of the radio wave by the base plate 14B can be reduced.
- the shield section 450 by providing the shield section 450, the apparatus-side antenna 414 and the main transport guide are provided.
- microstrip antennas are the most commonly used, as described in, for example, "Planet 'Small Antennas'” written by Tsukasa Haneishi, Kazuhiro Hirasawa and Yasuo Suzuki, IEICE, 1996, p.100.
- a difference of about 20 dB occurs between the directivity direction where the electric field strength is strong (front side) and the back side (back side) where the electric field strength is weakest, and about 10 dB in the direction perpendicular to the intermediate direction (horizontal direction). It is known that a difference in intensity occurs. Therefore, at least, the carry-out port 416 is arranged in a direction in which its electric field strength is smaller than the electric field strength in the directivity direction of the device-side antenna 414 by 10 dB or more (in other words, in the lateral direction and the back side). In this case, the same effect as described above can be obtained.
- the base plate 414B has a simple flat shape, but is not limited thereto, and may have another shape. Such a modification will be described with reference to FIG. [0225]
- Fig. 54 is a diagram showing a modification including a ground plate 414B 'of another shape, and is a diagram substantially corresponding to Fig. 53 in the above embodiment.
- the base plate 414B ′ has a substantially U-shape, and extends toward the side of the first portal 502 on the side opposite to the microstrip antenna element 414A.
- Side wall 414B'a the cartridge 500 including the first roll 502 may be covered with the side wall portion 414B'a, or the role of the housing 3 of the cartridge 500 may be given to the side wall portion 414B'a. It may be omitted (it may be removable or it may be stationary).
- the side wall portion 414B'a of the main plate 414B ' covers the first roll 502 from the side, so that the signal leaking to the first roll 502 can be more reliably blocked. This has the effect of reliably reducing the wraparound of radio waves by the ground plane 414B '.
- the coaxial cable 449 which is a signal line to the device-side antenna 414 is connected to the microstrip antenna element 414A, the ground plane 414B, and the surface of the dielectric 414C. Force arranged substantially perpendicular to the direction
- the connection is not limited to this, and other connection methods may be used.
- FIG. 55 is a diagram illustrating such a modification, and is a bottom view corresponding to the diagram viewed from the direction C in FIG. 51.
- a groove 414Bb is formed in a substantially horizontal direction on the back surface of the base plate 414B, and a feeder line 449A extending to a feed point P of the base plate 414B extends in the groove 414Bb in a substantially horizontal direction.
- the center conductor 449a of the coaxial cable 449 is connected to the end of the feeder line 449A exposed to the outer edge of the base plate 414B in a substantially horizontal direction.
- the coaxial cable 449 is disposed substantially in parallel with the plane directions of the microstrip antenna element 414A, the ground plane 414B, and the dielectric 414C. This is effective when the space for arranging the coaxial cable 449 cannot be taken as in the case of the open structure.
- the first roll 502 on which the base tape 501 on which the RFID circuit elements To are sequentially formed is wound around the reel member 502a.
- the force used was not limited to this, and other modes may be used.
- a substantially flat tray-shaped tray member (not shown) may be provided as the RFID tag circuit element storage section.
- a plurality of flat paper-shaped label materials, each having one RFID circuit element To formed therein, are stacked and stored in a flat stacking direction. By pulling out the flat paper label material one by one, multiple RFID circuit elements To can be sequentially extracted.
- the main transport guide 413 is arranged on the directional direction side of the apparatus-side antenna 414, and the tray member is arranged on the side opposite to the directional direction of the apparatus-side antenna 414.
- the strength of the wireless communication signal from the device-side antenna 414 is increased for the wireless tag circuit element To to be read, while the strength of the wireless communication signal from the device-side antenna 414 is increased for the wireless tag circuit element To and the discharge port 416 that are not to be read. Since the strength of the wireless communication signal from the device-side antenna 414 (and to the device-side antenna 414) is greatly reduced, the same effect can be obtained.
- the present invention is applied to a generation system of a radio tag that can be read only (not writable) has been described as an example.
- the present invention may be applied to a wireless tag generation system that writes wireless tag information into the IC circuit unit 551.
- the high-frequency circuit 451 performs a function of accessing (writing) the wireless tag information of the IC circuit unit 551 of the wireless tag circuit element To via the antenna 414, and
- the crystal unit 256, the PLL 257, and the VC 0258 of the transmitting unit 253 function as a carrier generating unit that generates a carrier for accessing (writing) the wireless tag information of the IC circuit unit 551.
- the signal processing circuit 422 functions as an access information generation unit that generates access information (an “Erase” signal, a “Verify” signal, a “Program” signal, etc., described later) for accessing the IC circuit unit 551.
- the terminal 18 or the general-purpose computer 20 receives the print character R and the access to the RFID circuit element To (the The ID, the address of the article information, and the storage destination address of the corresponding information are displayed. Then, when the wireless tag reader / writer 402 is operated by the operation of the terminal 18 or the general-purpose computer 20, and the print character R is printed on the cover film 503. In both cases, information such as the write ID and article information is written in the IC circuit unit 551.
- the basic configuration and the function of writing the wireless tag information to the IC circuit unit 551 are different from those of the first roll 502 or the tray member and the wireless tag reader / writer 402 in the above-described embodiment or its modification.
- the strength of the wireless communication signal from the device-side antenna 414 is increased with respect to the wireless tag circuit element To to be written.
- the wireless communication signal from the device-side antenna 414 (and to the device-side antenna 414) is directed toward the wireless tag circuit element To or the outlet 416 that has been stored or has been removed from the cartridge 500 or the like that is not to be written.
- the shield environment can be constructed and the output can be reduced as in the conventional method using the simple structure and the simple method described above.
- the wireless tag information can be written into the IC circuit unit 551 only for the wireless tag circuit element To to be written without requiring the above method.
- the present invention is not limited to the wireless tag reader / writer such as the cartridge 500 and the tray member, and may be a so-called installation type or an integrated type which cannot be attached to and detached from the apparatus main body. Les ,. In this case, a similar effect is obtained.
- the wireless tag reader / writer 402 reads or writes wireless tag information from the IC circuit unit 551 of the wireless tag circuit element To, and reads the wireless tag circuit element To by the thermal head 410.
- the printing (printing) for identification is performed, this printing is not necessarily performed, but may be performed only for reading or writing the wireless tag information.
- the main transport guide 413 and the scintillator 450, or the apparatus-side antenna 414 and the main transport guide 413 may be integrated. In this case, the effect that the fluctuation of the communication condition is reduced is obtained. [0242] Furthermore, if the distance between the shield part 450 and the main transport guide 413 is made larger than the distance between the device-side antenna 414 and the main transport guide 413, the shield part 450 when placed at the tag communication position is provided. Is less affected, and more stable communication is possible.
- the seventh invention is embodied with various changes within a range not departing from the gist thereof.
- FIG. 1 A sixth embodiment of the present invention will be described with reference to Figs. This embodiment is an embodiment in which the present invention is applied to a wireless tag generation system that can only read (cannot write).
- FIG. 56 is a conceptual configuration diagram showing a detailed structure of the wireless tag reader / writer 602 of the sixth embodiment.
- This wireless tag reader / writer 602 is suitably used in the communication system 10 and the like in the above-described first embodiment, and a description of overlapping parts will be omitted.
- the same parts as those in the above-described first to fifth embodiments are denoted by the same reference numerals, and description thereof will not be repeated.
- a device holder 608 (not shown) as a recess is provided in the device main body 608 of the wireless tag reader / writer 602, and the cartridge 700 is detachably attached to the holder.
- the apparatus main body 608 is provided with the cartridge holder part for fitting the cartridge 700 and also forms a housing 609, and a print head (thermal head) for performing predetermined printing (printing) on the cover film.
- a print head thermal head
- a ribbon take-up roll drive shaft 611 for driving the ink ribbon that has been printed on the cover film
- a tape feed roller drive shaft 612 for feeding out the printed tag tape 710 from the cartridge body 700, and a printed tag.
- a pair of the main transport guides 613 for setting and holding in a predetermined access area facing the antenna 614 and for guiding each of the wireless tags T after cutting, and the guided wireless tags T are taken out of a discharge port (discharge port).
- the sensor 618 is a reflection-type photoelectric sensor including, for example, a light projector and a light receiver.
- a light projector When the wireless tag T does not exist between the transmitter and the receiver, the light output from the transmitter is input to the receiver. On the other hand, when the wireless tag T exists between the light emitter and the light receiver, the light output from the light emitter is shielded, and the control output of the light power is inverted.
- the apparatus main body 608 also includes a high-frequency circuit 621 for accessing (performing reading or writing) to the RFID circuit element To via the apparatus-side antenna 614, and a reading circuit from the RFID circuit element To.
- a signal processing circuit 622 for processing the received signal, a power motor 623 for driving the ribbon winding roll drive shaft 611 and the tape feed roller drive shaft 612 described above, and controlling the drive of the cartridge motor 623.
- the control circuit 630 is a so-called microcomputer, and although not shown in detail, is constituted by a central processing unit (CPU), a ROM, a RAM, and the like. The signal processing is performed in accordance with a program stored in advance.
- the control circuit 630 is connected to the communication line 14 described with reference to FIG. 1 in the first embodiment via the input / output interface 631, and the above-described route server 16 connected to the communication line 14 and other components. Information can be exchanged between the terminal 18, the general-purpose computer 20, the information server 22, and the like.
- the configuration of the cartridge 100 is the same as the configuration described with reference to Fig. 50 in the above-described fifth embodiment, and a description thereof will be omitted in this embodiment.
- the detailed function of the high-frequency circuit 621 is the same as the configuration described with reference to FIG. 38 in the above-described second to fourth embodiments, and a description thereof will be omitted in this embodiment.
- the functional configuration of the RFID circuit element To provided on the above-described printed tag tape 710 is the same as the configuration described with reference to FIG. 3 in the first embodiment described above. A description thereof will be omitted.
- the procedure for reading the RFID tag information from the IC circuit section 751 of the RFID tag circuit element To is the same as the flowchart of FIG. 39 in the second to fourth embodiments described above. Since this is the same as that described with reference to, the description thereof is omitted in this embodiment.
- the most significant feature of the wireless tag reader / writer 602 of the present embodiment is that, as shown in Fig. 56, a microstrip antenna (directivity) having directivity is used as the device-side antenna 614.
- the main transport guide 613 is arranged on the directional direction side (right side in FIG. 56) of the device side antenna 614, and the directional direction side (FIG. 56) is further further than the main transport guide 613.
- a shield plate (shield portion) 660 for reducing the strength of the wireless communication signal is provided on the right side, and the cartridge 700 is further disposed on the side of the directivity direction (the right side in FIG. 56) of the shield plate 660. .
- a reflector (reflector) 661 for reflecting communication signals is provided on the side of the main transport guide 613 opposite to the direction of the directivity of the device-side antenna 614 (left side in FIG. 56).
- the shield plate 660 is separate from the cartridge 700, and is attached and fixed to the housing 609 of the apparatus main body 608.
- the main transport guide 613 is disposed at a position closer to the apparatus-side antenna 614 than the center of the shield plate 660 and the antenna 604.
- the detailed structure of the antenna 614 is the same as the structure described with reference to FIGS. 51 and 52 in the fifth embodiment described above, and therefore, the description thereof is omitted in this embodiment.
- FIG. 57 is a diagram conceptually and simply showing the main components such as the main transport guide 613 and the cartridge 700 in the structure shown in FIG. 56.
- the main transport guide 613 and the cartridge 700 are arranged at the positions where the main transport guide 613 is on the microstrip antenna element 614A side and the reflector 661 is on the ground plane 614B. Is located on the side.
- the microstrip antenna element 614A has a dimension (dimension in a direction along the longitudinal direction of the tag-side antenna 752) in which the RFID circuit element To is held in the access area by the transport guide 613. 752 is smaller than the longitudinal dimension D2.
- the carry-out port 616 is disposed so as to be located substantially perpendicularly to the direction of the directivity of the apparatus-side antenna 614 (vertical direction in the figure).
- the size (area) A3 of the sinored plate 660 is The projection area A2 of the first roll 702 in the cartridge 700 as viewed from the shield plate 660 side is configured to be larger than the central area of the antenna 614 on the apparatus side, and the first roll 702 in the cartridge 700 cannot be seen. Re, are arranged as follows.
- the first roll 702 forms a wireless tag circuit element storage section configured to store a plurality of wireless tag circuit elements described in each claim and to be able to sequentially remove the wireless tag circuit elements
- the main transport guide 613 includes: A wireless tag circuit element holding unit is configured to hold wireless tag circuit elements sequentially taken out of the wireless tag circuit element storage unit in a predetermined access area for accessing wireless tag information from a directional antenna.
- the wireless tag circuit element taken out as the printed tag tape 710 from the cartridge 700 and set and held by the main transport guide 613 at a predetermined position (access area) opposed to the apparatus-side antenna 614.
- the access information (the above-mentioned Scroll All ID signal) generated by the signal processing circuit 622 of the wireless tag reader / writer 602 is used by the first mixer 271 shown in FIG. 38 described above to modulate the carrier from the VC ⁇ 258.
- the signal is further amplified by the transmission-side amplifier 272, and then transmitted from the device-side antenna 614 to the IC circuit portion 751 of the RFID tag circuit element To in a non-contact manner.
- the wireless tag circuit element held by the main transport guide 613 from which information is to be read as it is is Not only this, but also information from the subsequent RFID circuit element To (the RFID circuit element immediately after being unwound from the cartridge 700 immediately following it or any other RFID circuit element contained in the cartridge 610).
- a microstrip antenna having directivity in a certain direction is used as the device-side antenna 614, and An access area is formed by providing the transport guide 613, and a shield plate 660 is further provided on the directional direction side of the main transport guide 613, thereby blocking communication signal leakage to the directional direction side.
- a cartridge 700 having a first roll 702 containing a plurality of RFID circuit elements To is arranged further on the directional direction side than the shield plate 660 in which the leakage is blocked.
- the antenna sensitivity from the antenna 614 is high with respect to the RFID tag circuit element To held in the access area, and the strength of the wireless communication signal is increased (see area B in FIG. 57).
- the shield effect of the shield plate 660 reduces the antenna sensitivity from the device-side antenna 614 and reduces the strength of the wireless communication signal.
- only the wireless tag information of the IC circuit 751 of the wireless tag circuit element To held in the main transport guide 613 after being taken out of the cartridge 700 can be accessed (radiation is performed).
- the RFID tag information of the IC circuit section 751 can be read only from the RFID tag circuit element To to be read without being read.
- the cartridge 700 is configured to be detachable from the wireless tag reader / writer main body 608
- the shield plate 660 is provided on the cartridge 700 or the first roll 702 side where the cartridge 700 is detachable, the cartridge 700 or the first It is necessary to equip a separate shield plate for each roll 702, which increases the manufacturing cost.
- the shield plate 660 by providing the shield plate 660 on the wireless tag reader / writer main body 608, the above can be avoided and the manufacturing cost can be reduced.
- the tag-side antenna 752 of the microstrip antenna element 614A in the directivity direction is transmitted. From the part longer than the longitudinal dimension D2 Radiation is not transmitted to and received from the tag-side antenna 752, and thus does not contribute much to signal transmission and reception.
- the longitudinal dimension D1 of the microstrip antenna element 614A is shorter than the dimension D2 of the tag-side antenna 752. It can be carried out.
- the size (area) A3 of the sinored plate 660 is larger than the projected area A2 of the first lonelette 702 viewed from the device-side antenna 614. Accordingly, a signal leaking from the shield plate 660 to the first roll 702 can be reliably blocked, and a sufficient shielding effect can be secured.
- the main transport guide 613 is arranged on the microstrip antenna element 614A side, which is the directivity direction, and the reflecting plate 661 is provided on the base plate 614B side opposite to the directivity direction. While reading the RFID tag information from the RFID tag circuit element To to be read on the microstrip antenna element 614A side, it is possible to prevent signal leakage from the opposite base plate 614B side to the outside of the device 602 ( (See area B in Figure 57).
- microstrip antennas are the most commonly used, as described in, for example, "Planet 'Small Antennas'” written by Tsukasa Haneishi, Kazuhiro Hirasawa and Yasuo Suzuki, IEICE, 1996, p.100.
- the shield plate 660 may have a structure like a metal mesh stripe formed by a metal flat plate, or may be a metal-deposited plate. Also, the shield plate 660 and the main transport guide 613 can be integrated. Further, the shape of the shield plate 660 is a simple flat shape, but is not limited thereto, and may be another shape. An example of such a modification will be described with reference to FIG. [0267]
- Fig. 58 is a view illustrating a modification including a shield plate 66 (/) having another shape, and is a view substantially corresponding to Fig. 57 in the above embodiment.
- the shield plate 66 (/ has a substantially U-shape, and is opposite to the microstrip antenna element 614A toward the side of the first roll 702 (see FIG. A side wall 66 ( ⁇ a) extending to the right side is provided.
- the cartridge 700 including the first roll 702 may be covered with the side wall 66Ca, or the casing 603 of the cartridge 700 may be covered.
- the role of the side wall part 66 (Ta can be omitted, so that the cartridge 700 can be omitted. (It may be detachable or may be an installation type.)
- the signal leaking to the first roll 702 side is more reliably blocked by covering the first roll 702 from the side with the side wall 66Ca of the seenored plate 660 '.
- the shielding effect can be more sufficiently secured.
- the coaxial cable 649 serving as a signal line to the antenna 614 is connected to the microstrip antenna element 614A, the ground plane 614B, and the dielectric 614C. Force arranged in a direction substantially perpendicular to the plane direction
- the connection is not limited to this, and other connection methods are also conceivable.
- a connection method as shown in FIG. 55 described above may be used.
- the first roll 702 on which the base tape 701 on which the RFID circuit elements To are sequentially formed is wound around the reel member 702a.
- the force which used was not limited to this, but may be other modes.
- an approximately flat box-shaped tray member (not shown) may be provided as the wireless tag circuit element storage section.
- a plurality of flat paper-shaped label materials each having one RFID circuit element To formed thereon, are stacked and stored in a flat stacking direction, for example, through an outlet provided on a side surface of the tray member.
- the main transport guide 613 is disposed on the directional direction side of the device-side antenna 614, and the shield plate 660 is disposed on the directional direction side of the main transport guide 613.
- the tray member By arranging the tray member on the directional direction side, the wireless communication from the device-side antenna 614 to the wireless tag circuit element To to be read is performed as in the above embodiment. While the strength of the radio signal is increased, the strength of the radio communication signal from the device-side antenna 614 (and to the device-side antenna 614) is greatly reduced by the shield plate 660 for the wireless tag circuit element To not to be read. Therefore, a similar effect can be obtained.
- the present invention is applied to a generation system of a radio tag that can only be read (not writable) has been described as an example.
- the present invention is not limited to this.
- the present invention may be applied to a wireless tag generation system that writes wireless tag information into the IC circuit unit 751.
- the high-frequency circuit 651 performs a function of accessing (writing) the wireless tag information of the IC circuit unit 751 of the wireless tag circuit element To via the antenna 614.
- the crystal unit 256, PLL 257, and VC0258 of the transmitting unit 253 shown in 38 function as a carrier generating unit that generates a carrier for accessing (writing) the wireless tag information of the IC circuit unit 751.
- the signal processing circuit 622 functions as an access information generating unit that generates access information (an “Erase” signal, a “Verify” signal, a “Program” signal, etc., described later) for accessing the IC circuit unit 751.
- the strength of the wireless communication signal from the apparatus-side antenna 614 is increased for the RFID circuit element To to be written.
- the strength of the wireless communication signal from the device-side antenna 614 (and to the device-side antenna 614) is greatly reduced for the wireless tag circuit element To stored or immediately removed from the cartridge 700 or the like not to be written. , Only the wireless tag circuit element To can communicate.
- the above-described simple structure and a simple method can be used to construct a shielded environment and reduce the output as in the conventional method.
- the wireless tag information can be written into the IC circuit unit 751 only for the wireless tag circuit element To to be written without requiring any method.
- the present invention is not limited to the wireless tag reader / writer such as the cartridge 700 and the tray member, which is not limited to the wireless tag reader / writer itself. . In this case, a similar effect is obtained.
- the wireless tag reader / writer 602 reads or writes wireless tag information from the IC circuit unit 751 of the wireless tag circuit element To, and reads the wireless tag circuit element To by the thermal head 610.
- the printing (printing) for identification is performed, this printing is not necessarily performed, but may be performed only for reading or writing the wireless tag information.
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Computer Networks & Wireless Communication (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Artificial Intelligence (AREA)
- Computer Vision & Pattern Recognition (AREA)
- Toxicology (AREA)
- Signal Processing (AREA)
- Computer Hardware Design (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Electromagnetism (AREA)
- General Health & Medical Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Near-Field Transmission Systems (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP04771808.5A EP1667336B1 (en) | 2003-09-19 | 2004-08-18 | Radio tag reader/writer |
US11/350,965 US8111137B2 (en) | 2003-09-19 | 2006-02-10 | RFID tag reader/writer |
Applications Claiming Priority (8)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2003327687A JP4114582B2 (ja) | 2003-09-19 | 2003-09-19 | 無線タグリーダライタ |
JP2003-327687 | 2003-09-19 | ||
JP2003359545A JP4465708B2 (ja) | 2003-10-20 | 2003-10-20 | 無線タグ情報通信装置 |
JP2003-359545 | 2003-10-20 | ||
JP2004027768A JP4565378B2 (ja) | 2004-02-04 | 2004-02-04 | 無線タグ情報通信装置 |
JP2004-027768 | 2004-02-04 | ||
JP2004027769A JP2005222206A (ja) | 2004-02-04 | 2004-02-04 | 無線タグ情報通信装置 |
JP2004-027769 | 2004-02-04 |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/350,965 Continuation-In-Part US8111137B2 (en) | 2003-09-19 | 2006-02-10 | RFID tag reader/writer |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2005029721A1 true WO2005029721A1 (ja) | 2005-03-31 |
Family
ID=34382101
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2004/011847 WO2005029721A1 (ja) | 2003-09-19 | 2004-08-18 | 無線タグリーダライタ |
Country Status (3)
Country | Link |
---|---|
US (1) | US8111137B2 (ja) |
EP (1) | EP1667336B1 (ja) |
WO (1) | WO2005029721A1 (ja) |
Cited By (1)
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US11192055B2 (en) | 2017-08-30 | 2021-12-07 | Cummins Filtration Ip, Inc. | Interlock for genuine filter recognition |
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
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US11192055B2 (en) | 2017-08-30 | 2021-12-07 | Cummins Filtration Ip, Inc. | Interlock for genuine filter recognition |
US11633684B2 (en) | 2017-08-30 | 2023-04-25 | Cummins Filtration Ip, Inc. | Interlock for genuine filter recognition |
Also Published As
Publication number | Publication date |
---|---|
EP1667336B1 (en) | 2013-05-01 |
EP1667336A1 (en) | 2006-06-07 |
US8111137B2 (en) | 2012-02-07 |
EP1667336A4 (en) | 2008-07-30 |
US20060220859A1 (en) | 2006-10-05 |
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