JP6546877B2 - Identification body and ID generation method - Google Patents

Description

  The present invention relates to an identifier that can identify an ID using a resonant frequency, and an ID generation method.

  Recently, with the development of the information society, information is recorded on labels and tags attached to products and the like, and management of products and the like is performed using the labels and tags. In information management using such labels and tags, a noncontact IC label or noncontact in which an IC chip capable of writing and reading information in a noncontact state to the label or tag is mounted The identification object using RFID technology, such as a type | mold IC tag, is rapidly prevailing from the outstanding convenience.

An identifier using such RFID technology is not limited to one having an IC chip mounted thereon as described above, but has a plurality of antennas having different resonance frequencies, and does not use an IC chip. It is also conceivable to make it possible to identify an ID in combination. For example, by making the shapes of the inductor element and the capacitor element constituting the plurality of antennas different, or making the shapes and directions of the plurality of antennas different to make the resonance frequency different for each of the plurality of antennas, combining the antennas Patent Document 1 discloses a technology capable of representing an ID. In this technique, it is possible to detect only the resonant frequency of the antenna according to the ID by cutting the wiring or shorting the capacitor part for any of the antennas having different resonant frequencies according to the ID. Thus, when the number of antennas is N, two pieces of information “1” and “0” can be provided depending on whether or not the resonant frequency is detected, and (2 ^N −1) The ID can be expressed in an identifiable manner.

  In addition, a plurality of wiring segments separated from each other are formed by analog printing, which is fixed printing, and a connection segment is additionally formed by digital printing, which is variable printing, between desired wiring segments. Patent Document 2 discloses a technique of connecting the two antennas and thereby changing the shape of the antenna. In this technique, the combination of fixed printing by analog printing and variable printing by digital printing can make the resonant frequency of the antenna different.

Japanese Examined Patent Publication 7-80386 Patent No. 5501601

  However, as described above, when processing the antenna according to the ID, considerable equipment is required, and there is a problem that the resonance frequency can not be easily made different. For example, in the case of cutting the wiring according to the ID, the wiring portion needs to be exposed to the outside in order to be able to easily cut the wiring without using considerable equipment, but the wiring portion is displayed outside. If this is done, there is a risk that the wiring will break unintentionally. In addition, when the capacitor portion is short-circuited, a dedicated heat pressure device / high-frequency equipment and the like are required, and defects easily occur. Furthermore, when fixed printing and variable printing are combined, a high-temperature drying furnace for drying the conductive ink constituting the wiring segment is required, and the resonance frequency can not be easily differentiated.

  The present invention has been made in view of the problems of the above-described conventional techniques, and it is desirable to easily generate a desired ID in an identifier that can identify an ID using a resonance frequency. An object of the present invention is to provide an identification object and an ID generation method that can be performed.

In order to achieve the above object, the present invention is
A discriminator comprising a plurality of conductive antennas formed on a base substrate, wherein at least a resonant frequency of the conductive antennas makes it possible to identify a given ID.
The plurality of conductive antennas have the same resonant frequency.
In the plurality of conductive antennas, non-metallic dielectrics having different relative dielectric constants respectively corresponding to the plurality of conductive antennas are selectively opposed according to the ID given to the identifier. Are arranged.

  In the present invention configured as described above, the conductive antenna formed on the base substrate is a sealing agent for sealing the conductive antenna and a nonmetallic dielectric different from the base substrate. By being disposed opposite to each other, the frequency characteristic of the conductive antenna changes. Therefore, a desired ID will be generated by utilizing this change in frequency characteristics.

For example, the loss factor of the dielectric calculated from (specific dielectric constant) × (dielectric loss tangent) × (film thickness [μm]) ^1/2 is 0.75 or less, and the resonant frequency of the conductive antenna is If the value is shifted to the frequency according to the desired ID, the dielectric is placed opposite to the conductive antenna to integrate the dielectric with the conductive antenna, and as a result, the resonant frequency of the conductive antenna Functions as an ID, and an ID can be generated by detecting this resonance frequency.

Thus, for the conductive antenna formed on the base substrate, the loss factor of the dielectric calculated from (specific dielectric constant) × (dielectric loss tangent) × (film thickness [μm]) ^1/2 is desired. Since a desired ID is generated by arranging a dielectric having a value corresponding to the ID in an opposite manner, an unintended disconnection of the conductive antenna does not occur, and a dedicated thermal pressure device / high frequency equipment, high temperature, The desired ID can be easily generated without using a drying oven.

  According to the present invention, the conductive antenna formed on the base substrate is disposed with the sealant for sealing the conductive antenna and the nonmetallic dielectric different from the base substrate facing each other. The desired ID can be generated easily, without causing unintended disconnection in the conductive antenna, and without using a dedicated hot press / high-frequency equipment or a high-temperature drying furnace. be able to.

For example, the loss factor of the dielectric calculated from (specific dielectric constant) × (dielectric loss tangent) × (film thickness [μm]) ^1/2 is 0.75 or less, and the resonant frequency of the conductive antenna is If the value is shifted to the frequency according to the desired ID, the resonant frequency of the conductive antenna corresponds to the ID by disposing the dielectric opposite to the conductive antenna, and this resonant frequency is detected. ID can be generated by this.

It is a figure which shows one Embodiment of the identification body of this invention, (a) is a surface figure, (b) is an AA 'sectional view shown to (a), (c) removed the resin layer 4 It is a figure which shows the structure of the surface. It is a figure which shows other embodiment of the identification body of this invention, (a) is a surface figure, (b) is an AA 'sectional view shown to (a), (c) removed the resin layer It is a figure which shows the structure of the surface. It is a figure which shows an example of the ID production | generation system which produces | generates and discriminate | determines ID provided to the ID tag shown in FIG.1 and FIG.2. It is a figure which shows the change of the frequency characteristic of the reflected wave from an antenna in, when the resin layer from which a dielectric constant differs is laminated | stacked on an antenna. It is a figure which shows the frequency characteristic of the reflected wave from the ID tag shown in FIG.1 and FIG.2, (a) is a figure which shows the frequency characteristic of the ID tag shown in FIG. 1, (b) was shown in FIG. It is a figure which shows the frequency characteristic of ID tag. It is a figure which shows other embodiment of the identification body of this invention, (a) is a surface figure, (b) is an A-A 'sectional view shown to (a), (c) is a back view.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a view showing an embodiment of the identification body of the present invention, wherein (a) is a surface view, (b) is a cross-sectional view taken along the line AA 'shown in (a), and (c) is a resin layer. It is a figure which shows the structure of the surface which removed 4a-4d. In addition, in FIG.1 (c), the area | region where resin layer 4a-4d is laminated | stacked is shown with the broken line.

  As shown in FIG. 1, in the present embodiment, five conductive antennas 3a to 3e are formed on a base substrate 2 made of an insulating material such as a resin film, and among the antennas 3a to 3e, It is ID tag 1a constituted by resin layers 4a-4d being laminated on antenna 3a-3d, respectively.

  The antennas 3a to 3e have a rectangular outer shape, and have a shape in which the slit enters the longitudinal direction from one of the short sides, and have the same shape and have the same resonant frequency. ing. The ID tag 1a enables identification of an arbitrary ID using the resonant frequencies of the antennas 3a to 3e, but the antennas 3a to 3e are fixedly printed on the base substrate 2 in the same shape regardless of the ID. It is formed by

  The resin layers 4a to 4d have mutually different relative dielectric constants. The resin layers 4a to 4d are laminated on the antennas 3a to 3d, for example, by applying a liquid containing a resin in a rectangular shape larger than the outer shape of the antennas 3a to 3d by solid printing to cover the antennas 3a to 3d. can do. Thus, the resin layers 4a to 4d are arranged to face the respective antennas 3a to 3d.

  As described above, the resin layers 4a to 4d are stacked on the antennas 3a to 3d so that the resin layers 4a to 4d are integrated with the antennas 3a to 3d, thereby detecting the reflected waves from the antennas 3a to 3d. The resonant frequency to be changed will change with respect to the case of the antennas 3a to 3d alone. That is, the antenna 3a is disposed by facing the antennas 3a to 3d with a sealing agent that seals the antennas 3a to 3d, and resin layers 4a to 4d that become non-metal dielectrics different from the base substrate 2. The desired ID is generated by changing the resonant frequency detected by the reflected wave from ~ 3d and making this resonant frequency function as an ID, but the relative dielectric constants of the resin layers 4a ~ 4d are mutually different. Because they are different, the resonant frequencies of the antennas 3a to 3e are shifted by an amount according to the relative dielectric constant of the resin layers 4a to 4d, whereby different reflected frequencies from the reflected waves from the antennas 3a to 3e are different. It will be detected. The details will be described later.

  FIG. 2 is a view showing another embodiment of the identification body of the present invention, wherein (a) is a surface view, (b) is a cross-sectional view taken along the line AA 'shown in (a), and (c) is a resin It is a figure which shows the structure of the surface which removed layer 4a, 4b, 4d. In FIG. 1C, the region where the resin layers 4a, 4b, 4d are stacked is indicated by a broken line.

  As shown in FIG. 2, the identification body in the present embodiment is different from that shown in FIG. 1 among the antennas 3 a to 3 e formed on the base substrate 2 in the antenna on which the resin layer is laminated. In the ID tag 1b according to the present embodiment, resin layers 4a, 4b and 4d are respectively stacked only on the antennas 3a, 3b and 3d among the antennas 3a to 3e.

  The ID tags 1a and 1b configured in this way are provided with IDs that allow identification, respectively, and among the antennas 3a to 3e formed on the base substrate 2, the IDs given to the ID tags 1a and 1b A resin layer having a relative dielectric constant corresponding to the ID is stacked on the antenna selected according to. Then, when an electromagnetic wave is transmitted to the ID tags 1a and 1b, a reflected wave to the electromagnetic wave is received, and individual IDs corresponding to the resonance frequency detected by the reflection intensity in the reflected wave are arranged in the order of the resonance frequency As a result, the IDs assigned to the ID tags 1a and 1b are generated and determined.

  Hereinafter, an ID generation method for generating and determining the ID assigned to the ID tags 1a and 1b configured as described above will be described.

  FIG. 3 is a diagram showing an example of an ID generation system that generates and discriminates the ID assigned to the ID tags 1a and 1b shown in FIGS. Although the ID tag 1b is not shown in FIG. 3, the electromagnetic wave transmitted from the reading device 5 is reflected by the ID tag 1b in the same manner as the ID tag 1a.

  As shown in FIG. 2, the ID generation system in this example comprises the ID tag 1a shown in FIG. 1 and a reader 5 for generating and discriminating the ID given to the ID tag 1a. It has antennas 30 a and 30 b, an electromagnetic wave radiation unit 10, a reflected wave reception unit 20, a processing unit 40, and a control unit 50.

  The electromagnetic wave radiation unit 10 transmits an electromagnetic wave including the resonance frequencies of the antennas 3a to 3e alone and the resonance frequencies of the antennas 3a to 3d changed by laminating the resin layers 4a to 4d on the antennas 30a to 3d. Send via.

  The reflected wave receiving unit 20 receives the reflected waves from the ID tags 1a and 1b received via the antenna 30b with respect to the electromagnetic wave transmitted from the electromagnetic wave emitting unit 10 via the antenna 30a.

  The processing unit 40 includes a reflection intensity detection unit 41 and an ID generation unit 42.

  The reflection intensity detection unit 41 detects the reflection intensity of the reflection wave received by the reflection wave reception unit 20.

  The ID generation unit 42 detects the resonance frequency in the ID tags 1a and 1b based on the reflection intensity detected by the reflection intensity detection unit 41, and the resonance frequency of each of the antennas 3a to 3e alone and the resin layer on the antennas 3a to 3d For each of the resonance frequencies changed by the lamination of 4a to 4d, the individual ID for the detected resonance frequency is set to "1", and the individual ID for the resonance frequency not detected is set to "0". The IDs assigned to the ID tags 1a and 1b are generated and determined by arranging 1 ′ ′ and “0” in the order of the resonance frequency. At this time, in the ID generation unit 42, the resin layers 4a to 4d are stacked by using the antenna 3e in which the resin layers 4a to 4d are not stacked as a reference antenna and using the shift amount of the frequency with respect to the reference antenna. It is conceivable to recognize the changed resonant frequency. In the antenna 3e in which the resin layers 4a to 4d are not stacked, as described later, the resonance frequency is higher than that of the antenna on which the resin layers 4a to 4d are stacked. The resonant frequency can be used to determine the reference antenna.

  The control unit 50 controls the radiation of the electromagnetic wave in the electromagnetic wave emission unit 10 and each process in the processing unit 40.

  The principle of being able to generate an ID will be described below by laminating the resin layers 4a to 4d having mutually different relative dielectric constants as described above on the antennas 3a to 3d having the same shape.

  FIG. 4 is a diagram showing a change in frequency characteristics of a reflected wave from the antenna when resin layers having different relative dielectric constants are stacked on the antenna.

  For example, as shown in FIG. 4, a resin layer made of a dielectric with a film thickness of 10 μm and a dielectric dissipation factor of 0.002 at a frequency of 10 GHz is laminated on an antenna having a resonant frequency in the vicinity of 8.3 GHz. The frequency characteristic was measured while changing the ratio ε to 2 to 7.

Then, the resonant frequency detected by the reflection intensity in the reflected wave from the antenna shifts to a lower frequency as the relative permittivity increases. This phenomenon occurs not only when the relative dielectric constant of the resin layer is changed, but also when the film thickness or dielectric loss tangent of the resin layer is changed. However, if the loss coefficient calculated from (relative dielectric constant) × (dielectric loss tangent at frequency 10 GHz) × (film thickness [μm]) ^1/2 exceeds 0.75, the reflection intensity in the reflected wave from the antenna However, there is a risk that the reference does not reach the reference for judging that the resonant frequency has been detected. Therefore, (dielectric constant) × (dielectric loss tangent at a frequency of 10 GHz) × (film thickness [μm]) ¹ It is preferable to set the loss factor calculated from ^{/ 2} to 0.75 or less. In addition, as a standard for judging that the resonant frequency is detected, the thing about the extent to which the electric power in reflection intensity is half can be considered.

  By using this principle, also in the ID tags 1a and 1b shown in FIGS. 1 and 2, the resin layers 4a to 4d having different relative dielectric constants are stacked on the antennas 3a to 3d having the same shape. Then, the resonance frequency of the antennas 3a to 3d can be changed, and an arbitrary ID can be generated and determined using the resonance frequency.

  FIG. 5 is a diagram showing frequency characteristics of reflected waves from the ID tags 1a and 1b shown in FIGS. 1 and 2. FIG. 5A is a diagram showing frequency characteristics of the ID tag 1a shown in FIG. b) is a figure which shows the frequency characteristic of ID tag 1b shown in FIG.

  As described above, in the ID tag 1a shown in FIG. 1, five antennas 3a to 3e having the same resonant frequency are formed on the base substrate 2 by having the same shape. Among the conductive antennas 3a to 3e, resin layers 4a to 4d having different relative dielectric constants are respectively stacked on the antennas 3a to 3d. The resin layer 4a has the largest relative dielectric constant, the resin layer 4b has the second largest dielectric constant, the resin layer 4c has the third largest dielectric constant, and the resin layer 4d has the smallest dielectric constant. It has become.

Therefore, when an electromagnetic wave is transmitted from the electromagnetic wave emission unit 10 of the reading device 5 shown in FIG. 3 to the ID tag 1a, it is received by the reflected wave reception unit 20 of the reading device 5 as shown in FIG. the ID in the reflected wave from the tag 1a, the resonant frequency f ₁ of a single antenna 3e, and f ₂ of the resonance frequency f ₁ is shifted to the low frequency side by the resin layer 4d that is laminated on the antenna 3d unitary antenna 3d , antenna and 3c alone f ₃ of the resonance frequency f ₁ is shifted to the low frequency side by the resin layer 4c stacked on the antenna 3c of the antenna 3b single resonant frequency f ₁ is the resin layer 4b laminated on the antenna 3b low frequency side f ₄ shifted, in f ₅ Metropolitan the resonance frequency f ₁ of a single antenna 3a is shifted to the low frequency side by the resin layer 4a which is laminated on the antenna 3a by, Resonant frequency by the peak morphism intensity is to be detected.

In ID generating unit 43 of the reading device 5, for each of the frequencies f ₁ ~f ₅ the resonance frequency as described above is detected, and the individual ID of "1" when the resonant frequency is detected, the resonant When no frequency is detected, the individual IDs are set to “0” and these are arranged in the order of low frequency, whereby the ID “11111” assigned to the ID tag 1 a is generated and determined.

On the other hand, when an electromagnetic wave is transmitted from the electromagnetic wave emission unit 10 of the reading device 5 shown in FIG. 3 to the ID tag 1b, it is received by the reflected wave reception unit 20 of the reading device 5 as shown in FIG. the ID in the reflected wave from the tag 1b, the resonance frequency f ₁ of a single antenna 3e, and f ₂ of the resonance frequency f ₁ is shifted to the low frequency side by the resin layer 4d that is laminated on the antenna 3d unitary antenna 3d , antenna and f ₄ shifted to the low frequency side by 3b single resonant frequency f ₁ is the resin layer 4b laminated on the antenna 3b, antenna 3a single resonant frequency f ₁ is the resin layer 4a which is laminated on the antenna 3a The resonance frequency is detected by the peak of the reflection intensity at f ₅ shifted to the low frequency side by However, in the ID tag 1b, since the resin layer 4c on the antenna 3c is not laminated, not detected the resonant frequency in f ₃ as ID tag 1a, the antenna 3c, like the antenna 3e antenna resonance frequency will be detected by 3c single resonant frequency f _1.

In the ID generation unit 43 of the reader 5, the individual ID is set to “1” when the resonance frequency is detected in the same manner as described above for each of the frequencies f _{1 to} f ₅ at which the resonance frequency is detected as described above. When the resonance frequency is not detected, the individual IDs are set to “0” and these are arranged in the order of low frequency, whereby the ID “11011” assigned to the ID tag 1 b is generated and determined.

Thus, in the ID tags 1a and 1b, the resin layers 4a to 4d are stacked on the antennas 3a to 3d in accordance with the assigned ID. That, ID tag 1a, if the first bit of the ID of five bits assigned to 1b is "1", a dielectric that can shift the resonance frequency f ₁ of a single antenna 3a~3e to f ₅ When the resin layer 4a having the rate is laminated on any one of the antennas 3a to 3e and the first bit of the assigned ID is "0", the resonant frequency f _{1 of the} single antenna 3a to 3e is f ₅ The resin layer 4a having a specific dielectric constant that can be shifted to the above is not laminated on any of the antennas 3a to 3e. The ratio Likewise, if the ID tag 1a, 2 bit of ID of five bits assigned to 1b is "1", which can shift the resonance frequency f ₁ of a single antenna 3a~3e to f ₄ When the resin layer 4b having a dielectric constant is stacked on any of the antennas 3a to 3e and the second bit of the assigned ID is "0", the resonant frequency f _{1 of the} single antenna 3a to 3e is f _The resin layer 4b having a dielectric constant that can be shifted to 4 is not laminated on any of the antennas 3a to 3e. The ratio Likewise, if the ID tag 1a, 3 bit of ID of five bits assigned to 1b is "1", which can shift the resonance frequency f ₁ of a single antenna 3a~3e to f ₃ When the resin layer 4c having a dielectric constant is stacked on any of the antennas 3a to 3e and the third bit of the applied ID is "0", the resonant frequency f _{1 of the} single antenna 3a to 3e is f _The resin layer 4c having a relative dielectric constant that can be shifted to ₃ is not laminated on any of the antennas 3a to 3e. The ratio Likewise, if the ID tag 1a, 4 bit of ID of five bits assigned to 1b is "1", which can shift the resonance frequency f ₁ of a single antenna 3a~3e to f ₂ When the resin layer 4d having the dielectric constant is stacked on any of the antennas 3a to 3e and the fourth bit of the assigned ID is "0", the resonant frequency f _{1 of the} single antenna 3a to 3e is f _The resin layer 4d having a dielectric constant that can be shifted to ₂ is not laminated on any of the antennas 3a to 3e. Incidentally, ID tag 1a, if all the bits of the ID of five bits assigned to 1b is "0", shifts the resonant frequency f ₁ of a single antenna 3a~3e to frequencies other than f ₂ ~f ₂ A resin layer having a specific dielectric constant that can be made to be stacked may be laminated on all the antennas 3a to 3e. However, as described above, when using the antenna 3e of the resin layer 4a~4d is not laminated as a reference antenna, to shift the resonance frequency f ₁ of a single antenna 3a~3e to frequencies other than f ₂ ~f ₂ It is not possible to laminate a resin layer having a specific dielectric constant that can be used on all of the antennas 3a to 3e. In that case, in the ID generation unit 42, the resonant frequencies of the antennas 3a to 3e alone and the resonant frequencies changed by laminating the resin layers 4a to 4d on the antennas 3a to 3d are registered in advance, respectively. For each of the registered resonance frequencies, it is conceivable to set the individual ID to “1” when the resonance frequency is detected and to set the individual ID to “0” when the resonance frequency is not detected. This is not preferable because the resonant frequency may change depending on the surrounding environment of the tags 1a and 1b.

  With such a configuration, the frequency characteristics of the reflected waves from the ID tags 1a and 1b are changed, and the resonance frequency detected in the frequency characteristics is a value according to the ID given to the ID tags 1a and 1b. The ID can be generated and determined by detecting this resonance frequency. As a result, the desired ID can be easily generated without causing an unintended disconnection in the antenna and without using a dedicated hot press / high frequency equipment or a high temperature drying oven.

(Other embodiments)
FIG. 6 is a view showing another embodiment of the identification body of the present invention, wherein (a) is a surface view, (b) is a cross-sectional view taken along the line AA 'shown in (a), and (c) is a back surface. FIG.

  As shown in FIG. 6, the identifier in this embodiment is not the one in which the resin layers 4a to 4d are respectively stacked on the antennas 3a to 3d as compared with the one shown in FIG. The ID tag 1c is different in that resin layers 4a to 4d are disposed to face the antennas 3a to 3d, respectively, on the surface opposite to the surface on which the 3a to 3e are formed.

Also in the ID tag 1c according to the present embodiment, the resin layer 4a are disposed to face the antenna 3a having a dielectric constant that can shift the resonance frequency f ₁ of a single antenna 3a~3e to f _5, antenna 3a~3e the resin layer 4b having a dielectric constant which can be shifted single resonance frequency f ₁ to f ₄ is arranged to face the antenna 3b, shifting the resonance frequency f ₁ of a single antenna 3a~3e to f ₃ disposed resin layer 4c is opposite the antenna 3c which has a dielectric constant that can, a resin layer 4d having a dielectric constant that can shift the resonance frequency f ₁ of a single antenna 3a~3e to f ₂ antenna 3d When the electromagnetic wave is transmitted from the electromagnetic wave emission unit 10 of the reading device 5 shown in FIG. In the received reflected wave from the ID tag 1c, the resonance frequency is detected for each of f _{1 to} f ₅ , whereby the ID “11111” given to the ID tag 1c in the ID generation unit 42 of the reading device 5 "Will be generated and determined.

  In the embodiment described above, resin layers 4a to 4d are formed on the antennas 3a to 3d by laminating rectangular resin layers 4a to 4d larger than the external shapes of the antennas 3a to 3e on the antennas 3a to 3d. Are disposed to face each other, but a resin layer having the same shape as the antennas 3a to 3e may be used, or a rectangular resin layer smaller than the outer shape of the antennas 3a to 3e may be used. However, when a rectangular resin layer smaller than the outer shape of the antennas 3a to 3e is used, the shift amount of the resonance frequency becomes small.

In the embodiment described above, a plurality of antennas having the same resonant frequency are formed by having the same shape on the base substrate, but a plurality of antennas having different resonant frequencies due to the different shapes. Alternatively, a plurality of antennas with mutually different polarization directions are formed on the base material because the directions are different from each other, and the dielectric constant, the film thickness of the resin layer, and the dielectric loss tangent also differ from each other as described above. , (Dielectric constant) × (dielectric loss tangent at a frequency of 10 GHz) × (film thickness [μm]) to generate more ID by laminating dielectrics having different loss coefficients calculated from ^1/2 Can. In this case, the resin layer is not laminated on at least one of the plurality of antennas, and the resin layer is laminated on the other antenna. That is, the antenna on which the resin layer is laminated and the resin layer are laminated. An ID is to be generated by configuring each of the unpaired antennas with at least one. The resonance frequencies may be made different from each other by laminating resin layers having different loss coefficients to all the antennas. However, in that case, it is necessary to make the loss coefficient of the resin layer laminated on the antenna used as the reference antenna constant, and to grasp the resonant frequency according to the loss coefficient.

  In the embodiment described above, the individual ID is set to “1” when the resonance frequency is detected, and the individual ID is set to “0” when the resonance frequency is not detected, and these frequencies are low. Although the IDs assigned to the ID tags 1a and 1b are generated and determined by arranging in order, the order of arranging the individual IDs may be in the order of high frequency. In that case, it goes without saying that the resin layers 4a to 4d stacked on the antennas 3a to 3d by the ID tags 1a and 1b also correspond to this.

  Further, as described above, the ID tag is not limited to the one that generates and discriminates an ID composed of a plurality of bits using a plurality of antennas, and for an ID tag in which one antenna having a certain shape is formed A different ID is assigned to each ID tag by arranging a dielectric having a loss coefficient that can shift the resonant frequency of the antenna to the resonant frequency corresponding to the ID given to the ID tag, facing the antenna. can do.

  In the embodiment described above, although the resonant frequency of the antenna is shifted to the frequency according to the ID by the resin layer, among the plurality of antennas having different resonant frequencies, only the antenna according to the ID is By making the resonant frequency undetectable, the desired ID may be generated. In that case, the loss coefficient such as the relative dielectric constant of the resin layer may be set to a value that does not reach the reference for judging that the resonance frequency is detected as the reflection intensity of the reflected wave from the antenna.

  Further, as shown in the above-described embodiment, the shape of the antenna is not limited to one having a rectangular outer shape and the slit entering the longitudinal direction from one of the short sides.

  In the embodiment described above, the individual ID is set to “1” when the resonance frequency is detected, and the individual ID is set to “0” when the resonance frequency is not detected. Although the ID assigned to the ID tag is generated and determined by arranging “0” in the order of resonance frequency, the individual ID is set to “0” when the resonance frequency is detected, and the resonance frequency is If not detected, the individual ID may be set to “1” and the “0” and “1” may be arranged in the order of the resonance frequency to generate and discriminate the ID assigned to the ID tag.

1a to 1c ID tag 2 base substrate 3a to 3e, 30a, 30b antenna 4a to 4d resin layer 5 reader 10 electromagnetic wave emission unit 20 reflected wave reception unit 40 processing unit 41 reflection intensity detection unit 42 ID generation unit 50 control unit

Claims (3)

A discriminator comprising a plurality of conductive antennas formed on a base substrate, wherein at least a resonant frequency of the conductive antennas makes it possible to identify a given ID.
The plurality of conductive antennas have the same resonant frequency.
In the plurality of conductive antennas, non-metallic dielectrics having different relative dielectric constants respectively corresponding to the plurality of conductive antennas are selectively opposed according to the ID given to the identifier. The identification body is placed. In the identifier according to claim 1,
The dielectric has a loss coefficient of 0.75 or less calculated from (specific dielectric constant) × (dielectric loss tangent) × (film thickness [μm]) ^1/2 , and the resonant frequency of the conductive antenna The identification body, which is a value for causing the dielectric to shift the frequency according to the ID. On the base substrate, a plurality of conductive antenna is formed identifying object, ID generation method for generating an ID using the resonance frequency of the plurality of electrically conductive antenna with the same resonant frequencies from each other,
A loss coefficient calculated from (specific permittivity) × (dielectric loss tangent) × (film thickness [μm]) ^1/2 corresponding to each of the plurality of conductive antennas is different from each other . 0.75 the following der Ru dielectric, by arranging selectively opposed to the conductive antenna said corresponding according to the ID given to the identifying object, the ID of the resonance frequency of the conductive antenna ID generation method to shift to the frequency according to.

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