JP2019080303A - Rf tag antenna, rf tag module, and rf tag label - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an RF tag label which can be made compact in size and can obtain communication performance required for managing a medium even when attached to a medium having a metal layer. An RF tag antenna 1 according to the present invention has a plate shape with a loop-shaped element 10 connected to an IC chip 20 and a meander-shaped radiating element 11 having a crank portion 110 bent in a hook shape. It is characterized in that it is composed of at least a plate-shaped radiating element 12, and the meander-shaped radiating element 11 and the plate-shaped radiating element 12 are connected to the outside of the loop-shaped element 10 in a state of facing each other. [Selection diagram] Fig. 1

Description

  The present invention belongs to the technical field of managing an optical disc, which is one of data recording media, using an RF tag.

  It has been studied for some time that the RF tag is used to manage an optical disc, which is one of the data recording media (inventory control, theft prevention, unauthorized copy prevention, etc.). The optical disc is a disk-shaped data recording medium for reading and writing data using reflection of light (laser light) by a reflection layer formed using a metal foil, and a typical optical disc is a CD (disc Compact Disc), DVD (Digital Versatile Disk), Blu-ray Disc (Blue-ray Disk), and the like.

  A disk drive compatible with an optical disk rotates an optical disk mounted on a turntable of the disk drive at high speed when reading and writing data, so a center hole for rotating the optical disk at high speed is an optical disk. It is located at the center of the disc.

  Therefore, as described in the inventions disclosed in Patent Documents 1 and 2, when attaching an RF tag to an optical disc, the RF tag having a circular antenna with a diameter larger than that of the center hole is circular with the center of the center hole. It is common practice to mount the optical disc with the antenna centered. In the invention disclosed in Patent Document 3, a dummy block having a mass equivalent to that of the IC chip is embedded at a position that is the target of the IC chip of the RF tag, and the dummy block is mounted on the turntable of the disk drive. An invention has been disclosed which suppresses the occurrence of vibration and rotational unevenness of the optical disc.

  When an RF tag having a UHF band as a frequency band is used to manage an optical disk, a radiating element is required for the antenna of the RF tag in addition to the antenna element for matching the impedance with the IC chip. In Patent Document 3, even if it is attached to an optical disc having a doughnut-shaped metal layer inside, it is possible to improve the operation stability and the information reading performance without losing the impedance matching with the IC chip. Possible RF tag modules are disclosed.

JP 2005-339666 A JP 2005-71575 A JP, 2005-209323, A JP, 2011-166340, A

  The RF tag antenna corresponding to the UHF band needs a radiation element in addition to the antenna element for matching the impedance with the IC chip. In view of cost and the like, it is desirable that the size of the RF tag antenna having a radiating element can be made compact in addition to the antenna element for achieving the impedance matching with the IC chip. In this form, the length in the width direction of the RF tag antenna becomes approximately equal to the diameter of the optical disc.

  Therefore, according to the present invention, a medium having a metal layer, such as an optical disc, can be made compact in size such that a reflective layer using a metal foil substantially fits in the non-data recording part of the optical disc formed in the data recording portion. It is an object of the present invention to provide an RF tag label which can obtain the communication performance necessary for the management of the medium, even if it is attached to

  According to a first aspect of the present invention for solving the above-mentioned problems, at least from a loop element connected to an IC chip, a meandering radiation element having a crank portion bent in a wedge shape, and a plate radiation element having a plate shape. The RF tag antenna is characterized in that the meandering radiation element and the plate-like radiation element are connected to the outside of the loop-like element in a state of facing each other.

  Furthermore, according to a second invention for solving the above-mentioned problems, a loop-like element connected to an IC chip, a meander-like radiating element having a crank portion bent in a bowl-like shape, and a plate-like radiating element having a plate-like shape An RF tag antenna connected to the outside of the loop element, and the loop element of the RF tag antenna, the antenna element and the plate element being opposed to each other; And an IC chip.

  Furthermore, according to a third invention for solving the above-mentioned problems, there is provided a plate-like radiation element having a loop-like element connected to an IC chip, a meander-like radiation element having a crank portion bent in a wedge shape, and a plate An RF tag antenna connected to the outside of the loop element, and the loop element of the RF tag antenna, the antenna element and the plate element being opposed to each other; An RF tag label comprising: a label base on which an RF tag module having an IC chip is mounted; and an adhesive layer laminated on the label base.

  According to the present invention, since the plate-like radiating element of the RF tag antenna is electrostatically coupled to the metal layer of the medium, by overlapping at least a part of the plate-like radiating element with the metal layer, the radiation element of the RF tag antenna As part of this, metal layers such as the reflective layer of the optical disc can be used. If a metal layer can be used as a radiating element of an RF tag antenna, the size of the RF tag antenna is compacted to a size that almost fits the non-data recording portion of the optical disc, and attached to a medium having metal properties such as an optical disc. When attached, the communication performance required to manage the medium such as the optical disk can be obtained.

The figure explaining the RF tag module concerning this embodiment. The figure explaining the RF tag label concerning this embodiment. The figure explaining the structure of DVD. The figure explaining DVD of the state which stuck the RF tag label. Diagram explaining the positional relationship between the reflective layer of DVD and the RF tag antenna The figure explaining the RF tag module concerning a modification.

  We will now describe preferred embodiments of the present invention. The following description does not limit the technical scope of the present invention, and is described to aid understanding.

  In the present invention, the communication necessary for managing a medium such as an optical disc is made even if the size is made compact so that the reflective layer using metal foil can be substantially accommodated in the non-data recording part of the optical disc formed in the data recording part. An object of the present invention is to provide an RF tag label capable of obtaining performance. In the present invention, this task is solved by devising an RF tag antenna mounted on the RF tag label.

  From here, after an RF tag module comprising at least the RF tag antenna according to the present embodiment and an IC chip connected thereto, and an RF tag label on which the RF tag module is mounted, effects obtained by the present invention will be described. It will be described in detail.

  FIG. 1 is a view for explaining an RF tag module 2 according to the present embodiment. The RF tag module 2 according to the present embodiment comprises at least an RF tag antenna 1 according to the present embodiment and an IC chip 20 connected thereto. Configured

  The frequency band used by the RF tag module 2 according to the present embodiment is the UHF band (860 to 960 Mhz), and the RF tag antenna 1 according to the present embodiment includes the loop element 10, the meander element 11 and the plate It is a dipole antenna including the three antenna elements of the radiating element 12.

  The shape of the loop element 10 of the RF tag antenna 1 according to the present embodiment is a loop (substantially circular), and the IC chip 20 is electrically connected to the loop element 10. The loop element 10 of the RF tag antenna 1 is an antenna element for matching the impedance with the IC chip 20 connected to the RF tag antenna 1. Since capacitive reactance (capacitance) exists between the input terminals of the IC chip 20, the shape of the loop element 10 of the RF tag antenna 1 is looped and the input terminal of the IC chip 20 connected to the RF tag antenna 1 The loop-like element 10 is provided with an inductive reactance (inductance) corresponding to the capacitive reactance present between the two. The inductive reactance of the loop element 10 does not have to be the same as the capacitive reactance existing between the input terminals of the IC chip 20.

  On the outside of the loop element 10 of the RF tag antenna 1, two radiation elements used for power supply and signal transmission / reception are connected facing each other. One radiation element connected to the loop element 10 of the RF tag antenna 1 is a meander radiation element 11, and the meander radiation element 11 has a meander shape having a crank portion 110 in which a conducting wire is bent in a hook shape. . Another radiation element connected to the loop element 10 of the RF tag antenna 1 is a plate-like radiation element 12, and the shape of the plate-like radiation element 12 is a plate-like shape similar to the plate electrode.

  One of the radiation elements connected to the loop element 10 of the RF tag antenna 1 is the meandering element 11 because the resonance frequency of the RF tag module 2 is the frequency band used by the RF tag module 2 UHF This is to make it easy to fit the band. Since the crank portion 110 of the meandering radiating element 11 has an inductive reactance, it becomes easy to design the RF tag antenna 1 so that the resonant frequency of the RF tag module 2 matches the UHF band.

  As the resonance frequency of the RF tag module 2, the optical disks with the RF tag module 2 attached are overlapped at a resonance frequency of 840 Mhz to 920 Mhz when the optical disks with the RF tag module 2 attached are not overlapped. It is desirable that the resonance frequency in the stationary state be from 920 Mhz to 1000 Mhz.

  In FIG. 1, in order to make it easy to understand the size of the antenna element constituting the RF tag antenna 1, the central part of the optical disc is described. A center hole 50 is processed at the center of the optical disc. The periphery of the center hole 50 is an annular non-data recording unit 51 not used for data recording, and the outside of the non-data recording unit 51 is a data recording unit 52 used for data recording.

  As illustrated in FIG. 1, the looped element 10 and the meandering radiating element 11 constituting the RF tag antenna 1 are designed to be accommodated in the non-data recording portion 51 of the optical disc. On the other hand, the plate-like radiation element 12 constituting the RF tag antenna 1 is designed such that at least a part of the plate-like radiation element 12 overlaps the data recording portion 52 of the optical disc.

  FIG. 2 is a diagram for explaining the RF tag label 3 according to the present embodiment. The RF tag label 3 according to the present embodiment is in the form of an annular seal label on which the RF tag module 2 described with reference to FIG. 1 is mounted, that is, a donut-shaped perforated seal label.

  The diameter of the label hole 33 formed in the RF tag label 3 is smaller than the diameter of the loop element 10 included in the RF tag antenna 1 of the RF tag module 2 mounted on the RF tag label 3 and the non-data recording portion of the optical disc The RF tag module 2 is mounted on the annular portion of the RF tag label 3 which is larger than the inner diameter of the T.51.

  The layer configuration of the RF tag label 3 according to the present embodiment will be described. The RF tag label 3 according to the present embodiment has a configuration in which at least a label base 30 on which the RF tag module 2 described with reference to FIG. 1 is mounted, an adhesive layer 31 and a release paper 32 are laminated.

  For example, a film made of a synthetic resin such as polyethylene terephthalate (PET) or polypropylene (PP) can be used as a base material of the label base material 30 constituting the RF tag label 3. It is preferable that the surface of the label base 30 on which the RF tag module 2 is not mounted be given printability for an ink jet printer.

  As a method of forming the RF tag antenna 1 of the RF tag module 2 on the substrate of the label substrate 30, a screen for printing the shape of the RF tag antenna 1 on one side of the substrate of the label substrate 30 using conductive ink A printing method and an etching method in which a metal foil formed on all or part of one side of the base material of the label base 30 is etched into the shape of the RF tag antenna 1 can be used.

  The pressure-sensitive adhesive layer 31 constituting the RF tag label 3 is a layer used when attaching the RF tag label 3 to an optical disc, and in the present embodiment, is laminated on the surface of the label substrate 30 on which the RF tag module 2 is mounted. There is. For the pressure-sensitive adhesive layer 31 constituting the RF tag label 3, an acrylic or rubber-based pressure sensitive adhesive whose adhesiveness is maintained can be used.

  The release paper 32 constituting the RF tag label 3 is a layer for protecting the adhesive layer 31 constituting the RF tag label 3. For the release paper 32 constituting the RF tag label 3, a synthetic resin film or paper on which a release agent such as silicone is applied on the side in contact with the adhesive layer 31 can be used.

  From here, the effects of the RF tag label 3 and the like according to the present embodiment will be described while showing an example in which the optical disc is a DVD.

  FIG. 3 is a diagram for explaining the structure of the DVD 4. The recording surface of the DVD 4 shown in FIG. 3 is only on one side, and from the label surface to which the RF tag label 3 is attached, a hard protective layer 420 formed using a UV curing resin etc., a reflective layer 421 formed of metal foil, A data recording layer 422 in which pits for recording data are formed, and a transparent resin layer 423 formed using a resin such as polycarbonate are laminated.

  In the DVD 4 illustrated in FIG. 3, a part of the periphery and the periphery of the center hole 40 formed in the center of the DVD 4 is an annular non-data recording part 41, and the protective layer 420 is formed on the entire surface of the DVD 4 There is. The reflective layer 421, the data recording layer 422, and the transparent resin layer 423 are formed at locations corresponding to the data recording unit 42 of the DVD 4. In FIG. 3, the outer diameter of the DVD 4 is 120 mm, the inner diameter of the non-data recording portion 41 (diameter of the center hole 40) is 15 mm, and the outer diameter of the non-data recording portion 41 (diameter of the center hole 40) is 37 mm. .

  FIG. 4 is a view for explaining the DVD 4 in a state in which the RF tag label 3 is attached. The RF tag label 3 designed based on the DVD 4 illustrated in FIG. 3 uses the adhesive layer 31 exposed by peeling off the release paper 32, and the center of the label hole 33 of the RF tag label 3 and the center hole 40 of the DVD 4 It is pasted to DVD 4 with the center aligned.

  In the RF tag label 3 designed based on the DVD 4 illustrated in FIG. 3, the loop-like element 10 and the meander-like radiating element 11 constituting the RF tag antenna 1 of the RF tag module 2 are center holes formed at the center of the DVD 4 It is designed to fit in the non-data recording unit 41 existing around 40. On the other hand, the plate-like radiation element 12 constituting the RF tag antenna 1 of the RF tag module 2 is designed such that a part of the plate-like radiation element 12 overlaps the data recording section 42 of the DVD 4.

  FIG. 5 is a view for explaining the positional relationship between the reflective layer 421 of the DVD 4 and the RF tag antenna 1. Since the reflective layer 421 of the DVD 4 is present only at the location of the data recording unit 42, the looped element 10 and the meandering radiating element 11 are arranged so as to be contained in the non-data recording unit 41 of the DVD 4 which is an area without the reflective layer 421. The inductive reactance that each has does not change significantly even if the RF tag label 3 is attached to the DVD 4, and the communication distance of the RF tag label 3 does not deteriorate significantly.

  Since a part of the plate-like radiating element 12 of the RF tag antenna 1 overlaps the reflection layer 421 of the DVD 4, the plate-like radiating element 12 of the RF tag antenna 1 and the reflection layer 421 of the DVD 4 are electrically coupled. In a region overlapping the reflective layer 421 of the DVD 4, the adhesive layer 31 laminated on the RF tag label 3 and the protective layer 420 of the DVD 4 are present between the plate-like radiating element 12 of the RF tag antenna 1 and the reflective layer 421 of the DVD 4 Thus, the electrical coupling between the plate-like radiating element 12 of the RF tag antenna 1 and the reflective layer 421 of the DVD 4 becomes electrostatic coupling.

  If the plate-like radiating element 12 of the RF tag antenna 1 and the reflective layer 421 of the DVD 4 do not have electrostatic coupling, the reflective layer 421 of the DVD 4 does not contribute to the communication of the RF tag module 2. By electrostatically coupling the plate-like radiating element 12 and the reflective layer 421 of the DVD 4, the reflective layer 421 of the DVD 4 functions as a part of the radiating element of the RF tag antenna 1. Specifically, the radio wave of the reader / writer which strikes the reflection layer 421 of the DVD 4 is propagated to the RF tag module 2 through the plate-like radiating element 12 and the radio wave carrying the signal from the RF tag module 2 is plate-like The light is propagated to the reflective layer 421 of the DVD 4 through the radiation element 12 and transmitted from the reflective layer 421 of the DVD 4. Therefore, the form of the RF tag module 2 in the state where the RF tag label 3 is attached to the DVD 4 is not the form illustrated in FIG. 1 but the form illustrated in FIG.

  If the reflection layer 421 of the DVD 4 can be used as a radiation element of the RF tag antenna 1, the size of the radiation element of the RF tag antenna 1 (here, the meander radiation element 11 and the plate radiation element 12) Even if the RF tag label 3 is attached to the DVD 4, the communication performance necessary for managing the DVD 4 can be obtained even if the RF tag label 3 is compacted so as to substantially fit in the recording unit 41.

  The shape of the RF tag antenna 1 of the RF tag module 2 described above is merely an example, and the specific contents of the RF tag antenna 1 of the RF tag module 2 depend on the specifications of the optical disc.

  Finally, a modification of the RF tag module 2 according to the present embodiment will be described. FIG. 6 is a diagram for explaining an RF tag module 6 according to a modification. In FIG. 6, the same components as those of the RF tag module 2 according to this embodiment are denoted by the same reference numerals. Since the optical disc is mounted on the turntable of the disc drive corresponding to the optical disc and rotates at high speed when data is read / written, the RF tag module 6 according to the modification shown in FIG. A dummy pattern 60 having a mass equivalent to that of the IC chip 20 is provided at a target position. The dummy pattern 60 may not be electrically connected to the loop element 10 of the RF tag module 6 according to the modification.

DESCRIPTION OF SYMBOLS 1 RF tag antenna 10 Loop-like element 11 Meander-like radiation element 12 Plate-like radiation element 2 RF tag module 20 IC chip 3 RF tag label 30 Label base material 31 Adhesive layer 32 Peeling paper 33 Label hole 4 DVD
40 center hole 41 non-data recording unit 42 data recording unit 420 protective layer 421 reflective layer 422 data recording layer 423 transparent resin layer

Claims (3)

The meander-like radiation element and the plate-like element are at least constituted by a loop-like element connected to an IC chip, a meander-like radiation element having a crank portion bent in a wedge shape, and a plate-like radiation element. The radiating elements are connected to the outside of the looped element, facing each other,
An RF tag antenna characterized by The meander-like radiation element and the plate-like element are at least constituted by a loop-like element connected to an IC chip, a meander-like radiation element having a crank portion bent in a wedge shape, and a plate-like radiation element. An RF tag antenna connected to the outside of the loop element with the radiating elements facing each other;
An IC chip connected to the loop element of the RF tag antenna;
RF tag module characterized by having. The meander-like radiation element and the plate-like element are at least constituted by a loop-like element connected to an IC chip, a meander-like radiation element having a crank portion bent in a wedge shape, and a plate-like radiation element. An RF tag antenna connected to the outside of the loop element with the radiating elements facing each other;
A label substrate on which an RF tag module having an IC chip connected to the loop element of the RF tag antenna is mounted;
A pressure-sensitive adhesive layer laminated on the label substrate,
RF tag label characterized by having.