WO2020026481A1 - Dispositif de lecture/d'écriture - Google Patents

Dispositif de lecture/d'écriture Download PDF

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Publication number
WO2020026481A1
WO2020026481A1 PCT/JP2019/006188 JP2019006188W WO2020026481A1 WO 2020026481 A1 WO2020026481 A1 WO 2020026481A1 JP 2019006188 W JP2019006188 W JP 2019006188W WO 2020026481 A1 WO2020026481 A1 WO 2020026481A1
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WO
WIPO (PCT)
Prior art keywords
conductor
reader
matching circuit
cable
circuit board
Prior art date
Application number
PCT/JP2019/006188
Other languages
English (en)
Japanese (ja)
Inventor
越智　達也
Original Assignee
株式会社村田製作所
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 株式会社村田製作所 filed Critical 株式会社村田製作所
Priority to JP2019543131A priority Critical patent/JPWO2020026481A1/ja
Publication of WO2020026481A1 publication Critical patent/WO2020026481A1/fr

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    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/50—Structural association of antennas with earthing switches, lead-in devices or lightning protectors
    • 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

Definitions

  • the present invention relates to a reader / writer device having a cable-like reader / writer antenna.
  • Patent Literature 1 discloses a reader configured to wind a cable-like reader / writer antenna on a bottom wall of a hanger rack, and to read RFID tags of a plurality of clothes suspended from a hanger pipe by the reader / writer antenna. A writer device is described.
  • An object of the present invention is to provide a reader / writer device capable of suppressing a decrease in antenna characteristics of a reader / writer antenna.
  • the reader / writer device including a rack having a metal surface inside a housing and a cable-like reader / writer antenna wired inside the housing, The reader / writer antenna, A cable having one end connected to the power supply unit and extending from the one end to the other end, and a second conductor extending from the one end to the other end along the first conductor.
  • Shaped body A matching circuit board that is connected to the other end of the first conductor and the other end of the second conductor, and that has a matching circuit unit that matches the impedance of the first conductor with the impedance of the second conductor.
  • the matching circuit board has an electrode pattern formed on a facing surface facing the second conductor via an insulator, and is attached to the metal surface so that the electrode pattern intersects the metal surface. It is configured to be.
  • FIG. 1 is a perspective view illustrating a schematic configuration of an RFID system including a reader / writer device according to an embodiment. It is a front view of the RFID system of FIG.
  • FIG. 2 is a side view showing the inside of the RFID system of FIG. 1. It is a top view showing an example of an RFID tag.
  • FIG. 2 is an exploded perspective view illustrating an example of an RFIC element. It is a schematic structure figure showing an example of a reader / writer antenna.
  • FIG. 6B is a schematic diagram of a matching circuit unit included in the reader / writer antenna of FIG. 6A.
  • FIG. 6B is a plan view of a matching circuit unit included in the reader / writer antenna of FIG. 6A.
  • FIG. 7B is a sectional view taken along line A1-A1 of FIG. 7A.
  • FIG. 6B is an equivalent circuit diagram of a matching circuit unit included in the reader antenna of FIG. 6A. It is a front view which shows the modification which attached the RFID tag to the bottom face of rack storage equipment. It is a front view which shows the modification which attached the RFID tag to the side surface of the rack storage apparatus.
  • a conventional reader / writer antenna includes a cable-shaped main body and a matching circuit board.
  • the cable-shaped main body has one end connected to the power supply unit and extending from one end to the other end (for example, an inner conductor), and extending from one end to the other end along the first conductor. And an existing second conductor (for example, an outer conductor).
  • the matching circuit board is connected to the other end of the first conductor and the other end of the second conductor, and has a matching circuit that matches the impedance of the first conductor with the impedance of the second conductor. Further, the matching circuit board has an electrode pattern formed on a facing surface facing the second conductor via the insulator.
  • the present inventors when the matching circuit board is mounted on the metal surface such that the opposing surface on which the electrode pattern is formed is parallel to the metal surface, a capacitance component occurs between the electrode pattern and the metal surface, It has been found that the capacitance component is a factor that degrades antenna characteristics. Based on this new finding, the present inventors have found the following invention.
  • the reader / writer device includes: A reader / writer device including a rack having a metal surface inside a housing and a cable-like reader / writer antenna wired inside the housing, The reader / writer antenna, A cable having one end connected to the power supply unit and extending from the one end to the other end, and a second conductor extending from the one end to the other end along the first conductor. Shaped body, A matching circuit board that is connected to the other end of the first conductor and the other end of the second conductor, and that has a matching circuit that matches the impedance of the first conductor with the impedance of the second conductor. , The matching circuit board has an electrode pattern formed on a facing surface facing the second conductor via an insulator, and is attached to the metal surface so that the electrode pattern intersects the metal surface. It is configured to be.
  • the matching circuit board is attached to the metal surface so that the electrode pattern intersects the metal surface, the facing area between the electrode pattern and the metal surface is reduced, and the capacitance between them is reduced.
  • the generation of components can be suppressed.
  • a decrease in antenna characteristics of the reader / writer antenna can be suppressed.
  • the matching circuit board may be attached to the metal surface such that the electrode pattern is orthogonal or substantially orthogonal to the metal surface. According to this configuration, it is possible to further suppress the generation of a capacitance component between the electrode pattern and the metal surface, and to further suppress the deterioration of the antenna characteristics of the reader / writer antenna.
  • the rack may be a server rack having a plurality of metal surfaces on a plurality of inner surfaces of a rectangular parallelepiped housing.
  • the cable-shaped main body may be arranged to extend in a vertical direction along an inner surface of the housing, and the matching circuit board may be attached to an upper inner surface or a lower inner surface of the housing. Good. According to this configuration, a plurality of RFID tags arranged in the housing can be efficiently read by one reader / writer antenna, and the length of the reader / writer antenna can be further reduced.
  • the electrode pattern may be provided at a predetermined distance or more from a metal surface different from a metal surface to which the matching circuit board is attached. According to this configuration, it is possible to suppress the influence of the plurality of metal surfaces and further suppress the deterioration of the antenna characteristics of the reader / writer antenna.
  • FIG. 1 is a perspective view illustrating a schematic configuration of an RFID system including a reader / writer device according to the present embodiment.
  • FIG. 2 is a front view of the RFID system of FIG.
  • FIG. 3 is a side view showing the inside of the RFID system of FIG.
  • the RFID system is a system that manages a plurality of rack storage devices stored inside a server rack installed in a data center using an RFID tag. According to this system, for example, even if the rack storage device is offline, it is possible to manage the rack storage device by reading the information of the RFID tag.
  • an RFID system 1 includes a server rack 2, which is an example of a rack, a rack storage device 3 stored in the server rack 2, and a cable-shaped reader / writer antenna 4.
  • the server rack 2 has a metal surface inside the housing 21 which is an outer shell.
  • the server rack 2 has metal surfaces on a plurality of inner surfaces of the rectangular parallelepiped housing 21. More specifically, in the case 21, the upper inner surface 21A, the lower inner surface 21B, and the left and right inner surfaces 21C and 21D are made of metal.
  • the front surface (the right side in FIG. 3) and the rear surface (the left side in FIG. 3) of the housing 21 are open surfaces. However, for example, a door that can be opened and closed may be provided.
  • the rack storage device 3 is a device housed inside the housing 21 of the server rack 2 so as to be able to be inserted and removed in the insertion and removal direction X.
  • a plurality of rack storage devices 3 are stored in the housing 21 so as to be arranged in a vertical direction Z perpendicular to the insertion / extraction direction X.
  • Each rack storage device 3 has a bottom portion supported by, for example, a pair of rails (not shown) provided to extend in the insertion / extraction direction X.
  • Metal columns 21E and 21F extending in the vertical direction Z are provided on the left and right inner side surfaces 21C and 21D of the housing 21, respectively.
  • Each rack storage device 3 is fixed to the metal columns 21E and 21F by fastening members such as bolts.
  • the interval between the rack storage devices 3 adjacent to each other in the vertical direction Z is, for example, 5 cm.
  • Each rack storage device 3 has a tag mounting surface 3A parallel to the insertion / extraction direction X.
  • the tag mounting surface 3A is made of a conductor such as a metal.
  • the RFID tag 5 is attached to the tag attachment surface 3A in parallel with the insertion / extraction direction X.
  • the RFID tag 5 stores, for example, device information and position information of the rack storage device 3.
  • the reader / writer antenna 4 is wired inside the housing 21 and is configured to be able to wirelessly communicate with the RFID tag 5.
  • the reader / writer antenna 4 includes a cable-shaped main body 41, a communication module 42 connected to one end of the cable-shaped main body 41, and a matching circuit board 43 connected to the other end of the cable-shaped main body 41. ing.
  • the cable-shaped main body 41 is arranged so as to extend in the vertical direction Z along the inner side surface 21C of the housing 21.
  • the matching circuit board 43 is attached to the upper inner surface 21 ⁇ / b> A of the housing 21.
  • the communication module 42 includes an external communication antenna (not shown), transmits information of the RFID tag 5 read through the cable-shaped main body 41 to an external device, and transmits information received from the external device to the cable-shaped main body 41. Is written to the RFID tag 5 through the.
  • the RFID tag 5 and the cable-shaped main body portion 41 are arranged inside the housing 21 so as to be biased toward the upstream side (the right side in FIG. 3) in the insertion / removal direction X.
  • a “reader / writer device” that wirelessly communicates with the RFID tag 5 by the server rack 2 and the reader / writer antenna 4 to read and write information from / to the RFID tag 5 is configured.
  • FIG. 4 is a plan view showing an example of the RFID tag 5.
  • the RFID tag 5 includes an RFIC (Radio-Frequency Integrated Circuit) element 51 having a pair of terminal electrodes 51a and 51b, a radiating element 52 connected to one terminal electrode 51a, and the other terminal. And a ground conductor 53 connected to the electrode 51b.
  • RFIC Radio-Frequency Integrated Circuit
  • the radiating element 52 protrudes from the rack storage device 3 in the insertion / extraction direction X, and at least a part of the ground conductor 53 has a tag mounting surface 3 ⁇ / b> A Attached to face.
  • the cable-shaped main body 41 is provided at a position overlapping with the radiating element 52 of the RFID tag 5 in a side view as viewed from a lateral direction Y orthogonal to the insertion / extraction direction X and the vertical direction Z. I have.
  • the cable-shaped main body portion 41 is provided at a position that does not overlap with the RFID tag 5 when viewed from the front in the insertion / extraction direction X.
  • FIG. 5 is an exploded perspective view showing an example of the RFIC element 51.
  • the RFIC element 51 is, for example, an RFIC element corresponding to a communication frequency in a 900 MHz band, that is, a UHF band.
  • the RFIC element 51 includes a multilayer substrate 51A, an RFIC chip 51B built in the multilayer substrate 51A, and a matching circuit 51C.
  • the multilayer substrate 51A is composed of three laminated sheet-like insulating layers 51Aa, 51Ab, and 51Ac.
  • a pair of terminal electrodes 51a and 51b are provided on the upper surface of the uppermost insulating layer 51Aa with a space therebetween.
  • a first coil pattern 51Ca is provided at a position facing one terminal electrode 51a
  • a second coil pattern 51Cb is provided at a position facing the other terminal electrode 51b.
  • One end of the first coil pattern 51Ca is connected to one terminal electrode 51a via an interlayer connection conductor
  • the other end of the first coil pattern 51Ca is connected to the other end of the second coil pattern 51Cb.
  • One end of the second coil pattern 51Cb is connected to the other terminal electrode 51b via an interlayer connection conductor.
  • a through hole H1 into which the RFIC chip 51B is inserted is provided between the first coil pattern 51Ca and the second coil pattern 51Cb.
  • a third coil pattern 51Cc is provided at a position facing the first coil pattern 51Ca, and a fourth coil pattern 51Cd is provided at a position facing the second coil pattern 51Cb. Is provided.
  • An RFIC chip 51B is mounted between the third coil pattern 51Cc and the fourth coil pattern 51Cd.
  • One end of the third coil pattern 51Cc is connected to one end of the first coil pattern 51Ca via an interlayer connection conductor, and the other end of the third coil pattern 51Cc is connected to one input / output terminal of the RFIC chip 51B. I have.
  • One end of the fourth coil pattern 51Cd is connected to one end of the second coil pattern 51Cb via an interlayer connection conductor, and the other end of the fourth coil pattern 51Cd is connected to the other input / output terminal of the RFIC chip 51B. I have.
  • the matching circuit 51C includes a first coil pattern 51Ca, a second coil pattern 51Cb, a third coil pattern 51Cc, a fourth coil pattern 51Cd, and each interlayer connection conductor.
  • the matching circuit 51C functions to match the impedance between the RFIC chip 51B and the radiating element 52 and the ground conductor 53.
  • the RFIC chip 51B is activated by receiving a current induced by the reception. Further, the activated RFIC chip 51B generates a high-frequency signal, and outputs the generated signal to the outside as a radio wave via the radiating element 52 and the ground conductor 53.
  • the radiation element 52 and the ground conductor 53 are partially formed in a meander shape. Thereby, the length in the longitudinal direction can be compressed while maintaining the entire electrical length.
  • the end 53a of the ground conductor 53 is configured to be capacitively coupled to the tag mounting surface 3A of the rack storage device 3 respectively.
  • the radiating element 52 is designed to have an electrical length longer than that of the ground conductor 53. Note that the present invention is not limited to this, and the ground conductor 53 may be designed so that the electrical length is longer than the radiating element 52.
  • the RFIC element 51, the radiating element 52, and the ground conductor 53 are provided on the base 54.
  • the base material 54 is a rectangular thin plate and has a uniform thickness.
  • the end 52a of the radiating element 52 and the end 53a of the ground conductor 53 are both configured to be capacitively coupled to the tag mounting surface 3A of the rack storage device 3 via the base material 54.
  • the substrate 54 is made of, for example, a dielectric material having a low dielectric constant of 10 or less.
  • the base material 54 is made of, for example, a flexible dielectric material such as polyethylene terephthalate (PET), a fluorine-based resin, a urethane-based resin, and paper.
  • FIG. 6A is a schematic configuration diagram illustrating an example of the reader / writer antenna 4.
  • FIG. 6B is a schematic diagram of a matching circuit unit provided in the reader / writer antenna 4 of FIG. 6A.
  • FIG. 7A is a plan view of a matching circuit unit included in the reader / writer antenna 4 of FIG. 6A.
  • FIG. 7B is a sectional view taken along line A1-A1 of FIG. 7A.
  • FIG. 7C is an equivalent circuit diagram of a matching circuit unit included in the reader / writer antenna 4 of FIG. 6A.
  • the reader / writer antenna 4 includes a cable-shaped main body 41 formed of a coaxial cable.
  • the cable-shaped main body 41 has an inner conductor 44 which is an example of a first conductor, and an outer conductor 45 which is an example of a second conductor provided along the inner conductor 44.
  • the internal conductor 44 is a linear conductor having one end connected to the power supply unit 46 and extending from one end to the other end.
  • the power supply unit 46 is built in the communication module 42 shown in FIGS.
  • the outer conductor 45 is a tubular conductor extending from one end to the other end along the inner conductor 44 so as to cover the inner conductor 44 via an insulator (not shown).
  • the reader / writer antenna 4 includes a matching circuit 47 provided at one end of the cable-shaped main body 41 and an external conductor 45 at a position away from the one end of the cable-shaped main body 41. And a magnetic body 48 provided along the outer peripheral surface.
  • the matching circuit unit 47 is connected to the other end of the internal conductor 44 and the other end of the external conductor 45 so as to match the impedance of the internal conductor 44 with the impedance of the external conductor 45. It works.
  • the matching circuit unit 47 includes a planar first conductor layer 471 connected to the internal conductor 44, a via-hole conductor 472, and a planar second conductor layer 472 as an example of the “electrode pattern”. And two conductor layers 473.
  • the first conductor layer 471 and the second conductor layer 473 have a width wider than the outer diameter of the outer conductor 45 and extend along the direction in which the inner conductor 44 extends.
  • the first conductor layer 471 and the second conductor layer 473 are provided to face each other with an insulator 474 interposed therebetween, and are connected to each other by two via-hole conductors 472.
  • the length of the second conductor layer 473 in the extending direction of the cable-shaped main body 41 is longer than that of the first conductor layer 471. Thereby, a part of the second conductor layer 473 and the external conductor 45 are provided so as to face each other with the insulator 474 interposed therebetween.
  • FIG. 7B in order to show both the via-hole conductor 472 and the internal conductor 44 in a cross section, the cut surface is shifted in the middle for convenience as shown by the line A1-A1 in FIG. 7A.
  • the inner conductor 44 is electrically connected to the first conductor layer 471.
  • the first conductor layer 471 is electrically connected to the second conductor layer 473 via two via-hole conductors 472.
  • the second conductor layer 473 is connected to the external conductor 45 by capacitive coupling having a capacitor component 475 via an insulator 474. That is, as shown in FIG. 7C, the inner conductor 44 and the outer conductor 45 are connected via the matching circuit unit 47 having the capacitor component 475 and the inductor component 476.
  • the magnetic body 48 is made of, for example, ferrite. As shown in FIG. 6A, the magnetic body 48 functions to separate the reader / writer antenna 4 into a radiating section 61 that performs wireless communication with the RFID tag 5 and a non-radiating section 62 that does not communicate with the RFID tag 5. I do. That is, the radiating portion 61 extends from one end of the cable-shaped main body 41 to the magnetic body 48. The non-radiating portion 62 extends from the magnetic body 48 to the other end of the cable-shaped main body 41. The non-radiating portion 62 functions as a shield member. The other end of the cable-shaped main body 41 is connected to the power supply section 46. The external conductor 45 is connected to the ground so as to be electrically stable.
  • the reader / writer antenna 4 is an antenna using a standing wave generated in the external conductor 45, and is not a loop antenna using a so-called induced magnetic field.
  • the detection area (radio wave area) of the reader / writer antenna 4 is limited to about 1 m or less.
  • the frequency characteristics do not change much.
  • the reader / writer antenna 4 can be relatively freely arranged two-dimensionally or three-dimensionally. Since the reader / writer antenna 4 is formed in a cable shape, the detection range of the reader / writer antenna 4 can be adjusted according to the length of the reader / writer antenna 4.
  • the matching circuit section 47 is provided on the matching circuit board 43 shown in FIGS.
  • the matching circuit board 43 has a second conductor layer 473 which is an electrode pattern formed on the facing surface OS facing the external conductor 45 via the insulator 474.
  • the matching circuit board 43 is directly or indirectly attached to the upper inner surface 21A via a spacer such that the second conductor layer 473 intersects the upper inner surface 21A of the housing 21 which is a metal surface.
  • the matching circuit board 43 is attached to the upper inner surface 21A where the angle formed by the second conductor layer 473 with respect to the upper inner surface 21A is in a range of 45 degrees or more and 135 degrees or less.
  • the matching circuit board 43 is attached to the upper inner surface 21A such that the second conductor layer 473 is orthogonal or substantially orthogonal to the upper inner surface 21A.
  • the second conductor layer 473 is provided at a predetermined distance or more from a metal surface different from the upper inner surface 21A to which the matching circuit board 43 is attached. For example, when a metal door is provided on the front surface (the right side in FIG. 3) of the housing 21, the second conductor layer 473 is provided at a distance of 5 cm or more from the door.
  • the matching circuit board 43 is attached to the upper inner surface 21A so that the second conductor layer 473 intersects the upper inner surface 21A which is a metal surface, the second conductor layer 473 and the upper inner surface 21A Can be made smaller. Thereby, it is possible to suppress generation of a capacitance component between the second conductor layer 473 and the upper inner surface 21A. As a result, a decrease in the antenna characteristics of the reader / writer antenna 4 can be suppressed.
  • the matching circuit board 43 is attached to the upper inner surface 21A so that the second conductor layer 473 is orthogonal or substantially orthogonal to the upper inner surface 21A, the second conductor layer 473 and the upper inner surface 21A. It is possible to further suppress the generation of a capacitance component between the capacitor and the capacitor 21A. As a result, the deterioration of the antenna characteristics of the reader / writer antenna 4 can be further suppressed.
  • the cable-shaped main body portion 41 is disposed so as to extend in the up-down direction Z along the inner side surface 21C of the housing 21, and the matching circuit board 43 is connected to the upper inner surface 21A of the housing 21 or It is attached to the lower inner surface 21B.
  • the plurality of RFID tags 5 arranged in the housing 21 can be efficiently read by one reader / writer antenna 4, and the length of the reader / writer antenna 4 can be further reduced.
  • the second conductor layer 473 is provided at a predetermined distance or more away from the metal surface different from the upper inner surface 21A to which the matching circuit board 43 is attached. The influence from the metal surface can be suppressed. As a result, the deterioration of the antenna characteristics of the reader / writer antenna 4 can be further suppressed.
  • the RFID tag 5 is attached such that the radiating element 52 projects from the rack storage device 3 in the insertion / extraction direction X, and at least a part of the ground conductor 53 faces the tag attachment surface 3A. ing.
  • the tag mounting surface 3A is made of a conductor such as a metal
  • the conductor can be used as a booster antenna, and the antenna gain can be improved. That is, according to the configuration, the RFID tag 5 can be read more reliably without depending on the material of the surface of the rack storage device 3. Further, since the RFID tag 5 is not attached to the front or back of the rack storage device 3 where the interface is usually provided, the visibility of the interface can be prevented from lowering, and the connection of the wiring to the interface is not hindered.
  • the RFID tag 5 and the cable-shaped main body 41 are arranged inside the housing 21 so as to be biased toward the upstream side in the insertion / removal direction X. According to this configuration, the RFID tags 5 of the plurality of rack storage devices 3 can be more reliably read by one reader / writer antenna 4.
  • the cable-shaped main body 41 is provided at a position overlapping with the radiating element 52 of the RFID tag 5 in a side view as viewed from a lateral direction orthogonal to the insertion / extraction direction X and the vertical direction Z. ing. According to this configuration, the RFID tags 5 of the plurality of rack storage devices 3 can be more reliably read by one reader / writer antenna 4.
  • the matching circuit board 43 is attached to the upper inner surface 21A of the housing 21, but the present invention is not limited to this.
  • the matching circuit board 43 may be attached to the lower inner surface 21 ⁇ / b> B of the housing 21. Further, the matching circuit board 43 may be attached to the inner side surfaces 21C and 21D of the housing 21. Further, the matching circuit board 43 is not limited to being mounted on the inner surface of the housing 21, but may be mounted on a metal surface provided in the housing 21. For example, when the server rack 2 has a metal partition, the matching circuit board 43 may be attached to the partition.
  • the “metal surface” is not limited to a flat surface, and may be, for example, a mesh surface.
  • the matching circuit board 43 is attached so that the longitudinal direction is along the upper inner surface 21A as shown in FIG. 1, but the present invention is not limited to this.
  • the matching circuit board 43 may be attached so that the short direction is along the upper inner surface 21A.
  • the plurality of rack storage devices 3 are arranged in the vertical direction Z, but the present invention is not limited to this.
  • the plurality of rack storage devices 3 may be arranged in the horizontal direction Y.
  • the cable-shaped main body 41 may be attached to the inner surface of the housing 21 so as to extend in the horizontal direction Y.
  • the tag mounting surface 3A of the rack storage device 3 is made of a conductor such as a metal, but the present invention is not limited to this.
  • the tag attachment surface 3A may be a surface in which a conductor such as a metal is coated with a resin.
  • the tag mounting surface 3A of the rack storage device 3 is the upper surface of the rack storage device 3 as shown in FIGS. 1 to 3, but the present invention is not limited to this.
  • the tag mounting surface 3A of the rack storage device 3 may be any surface that is parallel to the insertion / extraction direction X.
  • the tag attachment surface 3A is the bottom surface of the rack storage device 3, and the RFID tag 5 may be attached to the bottom surface.
  • the tag mounting surface 3A is a side surface of the rack storage device 3, and the RFID tag 5 may be mounted on the side surface.
  • the cable-shaped main body 41 when the cable-shaped main body 41 is positioned on an extension of the RFID tag 5 in the extending direction, it becomes difficult for the cable-shaped main body 41 to read the information of the RFID tag 5. For this reason, it is preferable that the cable-shaped main body 41 be provided at a position that does not overlap with the RFID tag 5 in a front view as viewed from the insertion / extraction direction X.
  • the cable-shaped main body 41 of the reader / writer antenna 4 is configured by a coaxial cable, but the present invention is not limited to this.
  • the cable-shaped main body 41 is provided along a strip-shaped insulator, a strip-shaped first conductor provided along one main surface of the insulator, and along the other main surface of the insulator. It may be constituted by a flat cable including a band-shaped second conductor.
  • the reader / writer apparatus which concerns on this invention, since the deterioration of the antenna characteristic of a reader / writer antenna can be suppressed, for example, the several rack storage apparatus accommodated inside the server rack installed in a data center is RFID. It is useful for RFID systems that manage using tags.

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Abstract

La présente invention concerne un dispositif de lecture/d'écriture qui est un dispositif de lecture/d'écriture comprenant : des étagères ayant une surface métallique à l'intérieur d'un boîtier ; et une antenne de lecture/d'écriture en forme de câble câblée à l'intérieur du boîtier. L'antenne de lecture/d'écriture comprend : une partie corps en forme de câble ayant un premier conducteur ayant une partie d'extrémité connectée à une unité d'alimentation électrique et s'étendant d'une partie d'extrémité à l'autre partie d'extrémité et un second conducteur s'étendant d'une partie d'extrémité à l'autre partie d'extrémité le long du premier conducteur ; et une carte de circuit d'adaptation ayant une unité de circuit d'adaptation qui est connectée à l'autre partie d'extrémité du premier conducteur et à l'autre partie d'extrémité du second conducteur et qui correspond à l'impédance du premier conducteur et à l'impédance du second conducteur. La carte de circuit imprimé d'adaptation présente un motif d'électrode formé sur une surface opposée faisant face au second conducteur par le biais d'un isolant et est fixée à la surface métallique de telle sorte que le motif d'électrode coupe la surface métallique.
PCT/JP2019/006188 2018-07-30 2019-02-20 Dispositif de lecture/d'écriture WO2020026481A1 (fr)

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JP2019543131A JPWO2020026481A1 (ja) 2018-07-30 2019-02-20 リーダライタ装置及びｒｆｉｄシステム

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JP2018142804 2018-07-30
JP2018-142804 2018-07-30

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WO2020026481A1 true WO2020026481A1 (fr) 2020-02-06

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP7528629B2 (ja) 2020-08-20 2024-08-06 Ｔｏｐｐａｎホールディングス株式会社 情報読み取りシステム

Citations (5)

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JP2008278206A (ja) * 2007-04-27 2008-11-13 Fujitsu Fip Corp Ｒｆｉｄリーダ用アンテナ
WO2018043012A1 (fr) * 2016-08-31 2018-03-08 株式会社村田製作所 Support pour présentoir de marchandises et système de gestion de marchandises
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Publication number Priority date Publication date Assignee Title
JPH03178112A (ja) * 1989-12-06 1991-08-02 Matsushita Electric Ind Co Ltd 複合チップ部品
JP2000164451A (ja) * 1998-11-30 2000-06-16 Kyocera Corp 積層セラミックコンデンサ
JP2008278206A (ja) * 2007-04-27 2008-11-13 Fujitsu Fip Corp Ｒｆｉｄリーダ用アンテナ
WO2018043012A1 (fr) * 2016-08-31 2018-03-08 株式会社村田製作所 Support pour présentoir de marchandises et système de gestion de marchandises
WO2018056362A1 (fr) * 2016-09-23 2018-03-29 株式会社村田製作所 Antenne plate

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JP7528629B2 (ja) 2020-08-20 2024-08-06 Ｔｏｐｐａｎホールディングス株式会社 情報読み取りシステム

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