JP5828249B2 - Non-contact IC label - Google Patents

Description

  The present invention relates to a non-contact IC label used in the UHF band and the SHF band.

Conventionally, wireless communication is performed between an RFID tag (non-contact IC label) and a reader. However, when this RFID tag is attached to a metal adherend, the communication performance deteriorates. To solve this problem, various configurations of RFID tags as described below have been studied. Yes.
For example, in an electromagnetic induction type RFID tag using radio waves in the 13.56 MHz band, a magnetic material (magnetic sheet) having a high magnetic permeability is provided between the antenna and the adherend, and loss is caused between the antenna and the adherend. By securing a route for a small amount of magnetic flux, an RFID tag that can be used even when attached to a metal adherend is realized.

On the other hand, in a radio frequency RFID tag used in the UHF band and the SHF band, a gap between the antenna and the adherend is secured by providing a dielectric or an air layer between the antenna and the adherend. A method for suppressing the influence of the adherend is generally used.
However, in this method, when a dielectric having a thickness of about 500 μm is used between the antenna and the adherend or an air layer having the same thickness is provided, the distance between the antenna and the adherend is not sufficient. Since it is too narrow, it is strongly influenced by the metal adherend and communication is impossible. Therefore, at present, it is considered difficult to produce a thin RFID tag (thickness of 500 μm or less).

  As another RFID tag of the radio wave system used in the UHF band and the SHF band, as shown in Patent Document 1, a configuration in which a magnetic body is provided between an antenna and an adherend has been proposed. In this RFID tag, a soft magnetic material is disposed between an antenna and a metal adherend. In Patent Document 1, there is a clear description of the soft magnetic material, but there is no clear description of the antenna to be used. As an application example of the antenna, there is a description of a monopole antenna, but there is only a description that the ground side element of the dipole antenna is dropped on a casing (metal object), and details thereof are not shown.

JP 2005-309811 A

  As an electrical connection method between the ground side and the housing in the monopole antenna described in Patent Document 1, methods such as bolts and screws, caulking, and the like are conceivable. Since there are problems such as oxide film formation and contamination on the connection conductor surface provided in the housing, the electrical connection method described above breaks those insulating films due to mechanical stress, and the electrical connection reliability Is increasing.

  However, when the RFID tag is used for a thin and small label, the above-described method of connecting to the housing such as bolts and screws, caulking, etc. is not practical because it is very inconvenient. . In addition, when an RFID tag is used as a label, the structure is affixed to the housing by the adhesive force of a non-conductive adhesive layer (adhesive) provided on the back surface, so that the convenience as a label is maintained. There is a problem in that it is not easy to electrically connect the ground side element to the casing.

  The present invention has been made in view of such problems, and operates as a monopole antenna, can communicate even when attached to a metal adherend, and is a thin and small non-contact IC. The purpose is to provide a label.

In order to solve the above problems, the present invention proposes the following means.
The non-contact IC label of the present invention includes a magnetic sheet, an antenna unit disposed on one surface of the magnetic sheet, and a surface disposed on one surface of the magnetic sheet, and is electrically connected to the antenna unit. The impedance matching circuit unit, the IC chip provided in the impedance matching circuit unit, and a part thereof are disposed on the other surface of the magnetic sheet and bent so as to be disposed along the edge of the magnetic sheet. And a ground portion electrically connected to the impedance matching circuit portion, and when viewed in the thickness direction of the magnetic sheet, the antenna portion is disposed in a region occupied by the ground portion. It is characterized by being.

Another non-contact IC label of the present invention includes a magnetic sheet, an antenna portion disposed on one surface of the magnetic sheet, and disposed on one surface of the magnetic sheet, and electrically connected to the antenna portion. The connected impedance matching circuit unit, the IC chip provided in the impedance matching circuit unit, and a part thereof are arranged on the other surface of the magnetic sheet so as to be arranged along the edge of the magnetic sheet And a ground portion electrically connected to the impedance matching circuit portion, the other surface of the magnetic sheet and the ground portion, and affixed to a metal adherend. And an adhesive layer that capacitively couples the ground portion and the adherend to each other through itself.

Another non-contact IC label of the present invention includes a magnetic sheet, an antenna portion disposed on one surface of the magnetic sheet, a portion disposed on one surface of the magnetic sheet, and the antenna portion An electrically connected impedance matching circuit unit, an IC chip disposed on one surface side of the magnetic sheet and provided on the impedance matching circuit unit, and an other surface of the magnetic sheet And the ground portion electrically connected to the impedance matching circuit portion, the other surface of the magnetic sheet, and the ground portion, and attached to a metal adherend to allow the ground to pass through itself. An adhesive layer that capacitively couples the portion and the adherend, and the impedance matching circuit portion is disposed along an edge of the magnetic sheet. Ri that is characterized in that bent.

In the non-contact IC label, the impedance matching circuit portion is formed in a coil shape, and the impedance matching circuit portion overlaps the antenna portion and the ground portion when viewed in the thickness direction of the magnetic sheet. It is more preferable that they are arranged so as not to become.
In the non-contact IC label, a step portion is formed on the other surface of the magnetic sheet, the ground portion is disposed on the step portion, and other than the step portion on the other surface of the magnetic sheet. More preferably, the outer surface and the outer surface of the ground portion are arranged on the same surface.
In the non-contact IC label, it is more preferable that a concave portion is formed on one surface of the magnetic sheet, and the IC chip is accommodated in the concave portion.

In the above non-contact IC label, the antenna unit, the impedance matching circuit unit, and the ground unit include a film-like substrate integrally formed by printing or etching on the main surface of the non-contact IC label, More preferably, the base material is wound around a magnetic sheet.
In the non-contact IC label, a radio wave system may be used as a communication system with the data reading device.
In the non-contact IC label, a radio wave method and an electromagnetic induction method may be used as a communication method with the data reading device.

Another non-contact IC label of the present invention includes a magnetic sheet, an antenna portion disposed on one surface of the magnetic sheet, a portion disposed on one surface of the magnetic sheet, and the antenna portion An electrically connected impedance matching circuit unit, an IC chip disposed on one surface side of the magnetic sheet and provided on the impedance matching circuit unit, and an other surface of the magnetic sheet And a ground portion electrically connected to the impedance matching circuit portion, and the impedance matching circuit portion is bent so as to be arranged along an edge of the magnetic sheet, and the thickness of the magnetic sheet When viewed in the direction, the antenna portion is disposed in an area occupied by the ground portion, the impedance matching circuit portion is formed in a coil shape, and the magnetic case is When viewed in the bets in the thickness direction, said impedance matching circuit is characterized in that it is arranged so as not to overlap the antenna portion and the ground portion.
Another non-contact IC label of the present invention includes a magnetic sheet, an antenna portion disposed on one surface of the magnetic sheet, a portion disposed on one surface of the magnetic sheet, and the antenna portion An electrically connected impedance matching circuit unit, an IC chip disposed on one surface side of the magnetic sheet and provided on the impedance matching circuit unit, and an other surface of the magnetic sheet And a ground portion electrically connected to the impedance matching circuit portion, and the impedance matching circuit portion is bent so as to be arranged along an edge of the magnetic sheet, and the thickness of the magnetic sheet When viewed in the direction, the antenna portion is disposed in a region occupied by the ground portion, and a step portion is formed on the other surface of the magnetic sheet, and the ground portion Together is disposed in the stepped portion, the surface other than the stepped portion of the other surface of the magnetic sheet, and an outer surface of the ground portion is characterized in that it is arranged on the same plane.

  According to the non-contact IC label of the present invention, it operates as a monopole antenna, can communicate even when attached to a metal adherend, and can be formed thin and small.

It is sectional drawing of the side which shows typically the non-contact IC label of 1st Embodiment of this invention. It is a top view of the non-contact IC label. It is a bottom view of the non-contact IC label. It is a figure which shows the state which printed the antenna part, the impedance matching circuit part, and the ground part on the main surface of the base material in the same non-contact IC label. It is sectional drawing which shows the state which affixed the non-contact IC label on the metal to-be-adhered body. It is a side view explaining the content of the experiment using the non-contact IC label. It is a bottom view of the non-contact IC label in the modification of 1st Embodiment of this invention. It is sectional drawing of the side which shows typically the non-contact IC label of 2nd Embodiment of this invention. It is a top view which shows typically the non-contact IC label of 3rd Embodiment of this invention. It is sectional drawing of the principal part of the non-contact IC label.

(First embodiment)
Hereinafter, a non-contact IC label according to an embodiment of the present invention will be described with reference to FIGS. This non-contact IC label performs non-contact communication with a data reader.
As shown in FIGS. 1 to 3, the non-contact IC label 1 of the present embodiment includes a magnetic sheet 10, an antenna unit 21 and an impedance matching circuit unit 22 arranged on one surface 10 a of the magnetic sheet 10, An IC chip 23 provided in the impedance matching circuit unit 22 and a ground unit 24 disposed on the other surface 10b of the magnetic sheet 10 are provided.
2, 3, 7, and 9, the base material 26 described later is not shown for convenience of description.

The thickness of the magnetic sheet 10 is, for example, 250 μm, and the magnetic sheet 10 is formed with a through hole (concave portion) 11 that penetrates in the thickness direction of the magnetic sheet 10.
As the magnetic sheet 10, a known material rich in flexibility can be used as a label, which is made of a composite material of magnetic particles or magnetic flakes and plastic or rubber. The magnetic sheet 10 is formed in a rectangular shape in plan view as viewed in the thickness direction of the magnetic sheet 10.
In the present embodiment, as shown in FIG. 4, the antenna unit 21, the impedance matching circuit unit 22, and the ground unit 24 are silver paste ink on the main surface 26a of the base material 26 formed in a film shape with a resin such as PET. Are integrally formed by printing. The thickness of the base material 26 is, for example, 50 μm.
Then, the antenna part 21, the impedance matching circuit part 22, and the ground part 24 are arranged on the surfaces 10a and 10b of the magnetic sheet 10 by winding the base material 26 around the magnetic sheet 10 and attaching the base material 26 with an adhesive layer (not shown). ing.
As shown in FIGS. 1 to 3, the antenna portion 21 and the ground portion 24 are formed in a rectangular shape in plan view. The antenna unit 21 and the ground unit 24 are each electrically connected to the impedance matching circuit unit 22.
The ground portion 24 is bent so as to be arranged along the edge portion 10 d of the magnetic sheet 10 on the other surface 10 b and the side surface 10 c of the magnetic sheet 10.
In the plan view shown in FIG. 2, the antenna unit 21 is disposed in a region occupied by the ground unit 24. That is, in plan view, the antenna unit 21 and the ground unit 24 may overlap with each other so that the antenna unit 21 and the ground unit 24 occupy each other.

As shown in FIG. 2, the impedance matching circuit unit 22 is formed by wiring meandering into a predetermined shape. The impedance matching circuit unit 22 is electrically connected to an electrical contact (not shown) of the IC chip 23, and is equal to each other between the IC chip 23 and the antenna unit 21 and between the IC chip 23 and the ground unit 24. The impedance and the resistance value are generated.
The IC chip 23 has a known configuration, and predetermined information is stored in the IC chip 23. Then, by supplying radio wave energy from an electrical contact (not shown) provided on the IC chip 23 by a radio wave system, the stored information can be transmitted from the electrical contact to the outside as a radio wave. The IC chip 23 is accommodated in the through hole 11 of the magnetic sheet 10.

The antenna unit 21, the impedance matching circuit unit 22, the IC chip 23, and the ground unit 24 configured in this way constitute the communication unit 20. And the base material 26 with which the communication part 20 was provided is wound around the magnetic sheet 10, and the antenna part 21 and the ground part 24 are arrange | positioned on both sides on both sides of the magnetic sheet 10, respectively. The side on which the antenna unit 21 shown in FIG. 2 is arranged is the front surface of the non-contact IC label 1, and the side on which the ground unit 24 shown in FIG.
As shown in FIG. 5, the non-contact IC label 1 configured as described above is attached to a metal plate (adhered body) 32 with an adhesive layer 31 on the back surface of the non-contact IC label 1. Any adhesive layer 31 may be used as long as it transmits radio waves.
By facing an external data reading device to the antenna unit 21, the antenna unit 21 becomes a radiation surface (radiation antenna element), the ground portion 24 becomes a ground surface (earth), and the non-contact IC label 1 becomes a monopole antenna (1 / 4 wavelength grounded antenna).

  The RFID tag normally employs a non-grounded half-wave dipole antenna, and includes a radiation antenna element having a quarter wavelength or less at each position across the IC chip. . Many of the radiating antenna elements have a meander shape (meandering shape) in order to reduce the size of the RFID tag.

  In the monopole antenna employed in the present invention, usually, a radiating antenna element on one side of a dipole antenna is grounded to electrically form a quarter-wave image antenna on the ground side, and the other one remaining. By combining with a / 4 wavelength radiating antenna element, a grounded ½ wavelength dipole antenna is formed. Therefore, as shown in FIG. 2, a single-wavelength antenna unit 21 can provide almost the same performance as a normal half-wavelength dipole antenna. When the antenna is mounted, the size of the label can be reduced as compared with the case where the normal half-wave dipole antenna is mounted.

However, the operation of the monopole antenna described above is based on the general condition that the radiating antenna element stands upright with respect to the ground plane and that the radiating antenna element is surrounded by the same dielectric such as air. This is the case. On the other hand, the configuration of the non-contact IC label 1 of the present embodiment is greatly different. That is, the antenna portion 21 that is a radiation surface is parallel to the ground portion 24 that is a ground surface. Further, the surface of the antenna portion 21 facing the external data reader is air with the base material 26 in between, but the back surface is in contact with the magnetic sheet 10 and the thin magnetic sheet. A ground portion 24 is arranged with 10 therebetween.
For this reason, it is thought that an effect and an effect | action differ by the non-contact IC label 1 of this invention, and the monopole antenna in the above-mentioned general conditions.

The case where the adherend is made of metal has been described above. Next, the case where the adherend is a container for storing a liquid will be described.
Conventionally, when a general RFID tag is attached to the center of the side surface of a container, if the wall surface of the container is thin, the contents of the container are in the same state as if they were in close contact with the entire surface of the antenna element. In addition, the resonance frequency of the antenna element is very likely to change due to the dielectric constant and dielectric loss of the contents. Because the dielectric constant and dielectric loss of the contents in the container change depending on the presence / absence of the liquid in the container and the type of the liquid, the resonance frequency of the antenna unit 21 changes due to the above reasons, and as a result, the communication distance decreases. There is a big problem that the RFID tag cannot be read by an external data reader.

In the non-contact IC label 1 of the present embodiment, as described above, the antenna unit 21 serves as a radiation surface of a monopole antenna facing the external data reader, and the ground unit 24 serves as a ground surface for the radiation surface as a monopole antenna. .
In the state where the non-contact IC label 1 is affixed to the container with the ground part 24 as the container side, when the container side as the adherend is viewed from the antenna part 21, the magnetic sheet 10 is first present and the conductor is located beyond that. There is a ground portion 24 that is a ground plane. For this reason, since the ground part 24 becomes a metal reflector and the influence of the container located on the back surface and the contents thereof is reduced, the resonance frequency of the antenna part 21 hardly changes, and therefore the fluctuation of the communication distance is also small. it is conceivable that.

A verification experiment was conducted to measure the communication distance when the non-contact IC label 1 configured as a monopole antenna as described above was attached to a metal plate or a container for storing liquid.
The contents and results will be described below.

(Experiment 1)
In the experiment, the equipment and materials shown below were used, and the construction was as shown in FIG.
-Magnetic sheet 10: NRC025 (thickness 250 μm) manufactured by Daido Steel Co., Ltd.
IC chip 23: NCODE UCODE G2iL
Antenna part 21 and ground part 24: 12 μm thick aluminum thin film
Dimensions of antenna unit 21 15 mm x 5 mm
・ Impedance matching circuit 22: Except IC chip 23, pattern printing with silver paste ink on substrate 26 made of in-house manufactured PET film (thickness 50 μm) (thickness 8 μm)
Reader / writer R1: 950 MHz band RFID reader / writer Mitsubishi Electric Corp. RF-RW002 (maximum output 1W 30 dBm)
Read antenna R2: 950 MHz band RFID antenna RF-ATCP001 (left-handed circularly polarized wave maximum gain 6 dBi) manufactured by Mitsubishi Electric Corporation
Fixed attenuator R3: Hirose Electric AT-107 (attenuation 7 dB)
The reader / writer R1, the reading antenna R2, and the fixed attenuator R3 constitute a data reading device R10.
-Metal plate 32: made of stainless steel (250 mm x 250 mm x 0.5 mm)

(1-1 Experimental method)
As shown in FIG. 6, the non-contact IC label 1 was placed on a stainless steel metal plate 32, and the communication distance of the non-contact IC label 1 was measured by the reading antenna R2.
The antenna unit 21 and the ground unit 24 are electrically connected to the impedance matching circuit unit 22 by surface contact with a connection pad (surface electrode) (not shown) formed outside the impedance matching circuit unit 22, and FIG. As shown, the antenna unit 21, the ground unit 24, and the impedance matching circuit unit 22 are integrated.
In this experiment, instead of the adhesive layer 31, a resin film 31 </ b> A having a dielectric constant comparable to that of an adhesive material that is supposed to be actually used (same degree as the adhesive layer 31) was used. Specifically, a PET film having a thickness of 25 μm was used.
Since the resin film 31A was used in place of the adhesive layer 31, a non-illustrated foaming polystyrene was placed on the non-contact IC label 1 to bring the metal plate 32 and the resin film 31A into close contact with each other, and the non-contact IC label 1 and the metal plate 32. It has been found that polystyrene foam has little effect on the measurement results of communication distance.

The reader / writer R1 and the reading antenna R2 used in the experiment are UHF band high-power reader / writers and antennas that can read the non-contact IC label 1 at a certain communication distance.
The maximum output of the reader / writer R1 is 1 W (30 dBm). For the convenience of the experimental environment, a −7 dB fixed attenuator R3 is connected to the coaxial cable connecting the reader / writer R1 and the reading antenna R2, and the output of the reader / writer R1 is output. The experiment was conducted by attenuating to 0.2 W (23 dBm).

(1-2 Experimental results)
The reading antenna R2 was rotated so as to face the non-contact IC label 1, and the maximum distance (communication distance) at which the reading antenna R2 can read information from the communication unit 20 was obtained.
The communication distance was 140 mm.
The above communication distance is a numerical value that can be said to have sufficient performance as a thin and small non-contact IC label capable of communicating even when directly attached to a metal adherend.

In actual use, since the output of the data reading device R10 can be increased up to 1 W (30 dBm) by removing the fixed attenuator R3, it goes without saying that the communication distance is further increased.
Further, the electrical property values (permeability, magnetic loss, dielectric constant, dielectric loss, etc.) of the magnetic sheet 10 are made suitable, the impedance matching of the impedance matching circuit unit 22, the thickness of the magnetic sheet 10, It is considered that the communication distance is further increased by optimizing the shapes of the antenna portion 21 and the ground portion 24.

Next, a verification experiment was performed to measure the communication distance when the adherend to which the non-contact IC label 1 of this embodiment is attached is used as a container.
The contents and results will be described below.

(Experiment 2)
The equipment and materials shown below were used for the experiment.
-The same thing as experiment 1 was used for the magnetic sheet 10, IC chip 23, the antenna part 21, the ground part 24, the impedance matching circuit part 22, and the base material 26. FIG.
-UHF band high output handy reader (data reading device): VAMCG1 manufactured by Samsunung Corporation Maximum output: 1W
-Container: Made of cylindrical plastic (diameter 70 mm x height 100 mm, side thickness 2 mm)

(2-1 Experimental method)
As in Experiment 1, the non-contact IC label 1 is attached to the center of the side surface of a container (not shown) so that the longitudinal direction of the non-contact IC label 1 is along the circumferential direction of the container. The communication distance of the non-contact IC label 1 was measured by a reader.
The measurement of the communication distance was performed in a state where the container was filled with tap water and in a state where the container was empty (no tap water).
As the data reading device, the above-mentioned UHF band high output handy reader suitable for reading a size of about the size of the non-contact IC label 1 was used. The maximum output of the handy reader is 1W, but the output can be varied in 1dB increments. In this experiment, the output was set to 0.5 W (27 dBm).

(2-2 Experimental results)
The handy reader was rotated so as to face the non-contact IC label 1 attached to the container, and the maximum distance at which the handy reader could read information from the communication unit 20 was obtained.
The communication distance was 110 mm when the container was filled with tap water, and 90 mm when the container was empty.
Although not shown as specific data of the communication distance, depending on the orientation of the handy reader, there may be almost no difference in the communication distance depending on the presence or absence of contents (tap water).
In this experiment, when the container is empty, the contents are air, and the non-contact IC label 1 is strongly influenced by the dielectric constant and dielectric loss of the air. On the other hand, when the container is filled with tap water, the non-contact IC label 1 is strongly affected by the dielectric constant and dielectric loss of tap water.
Since the dielectric constant of air is 1.0 and the dielectric constant of water is 80, even if only the dielectric constant is viewed, the influence of the air and water on the antenna part 21 in surface contact is large, and the antenna part 21 The change in resonance frequency should be significant. However, in the non-contact IC label 1 of the present invention, the difference in communication distance depending on the presence / absence of contents (tap water) is considerably small.

As described above, when attached to a container, a thin and small non-contact IC label 1 with little fluctuation in communication distance due to the presence or absence of the contents of the container and the difference in contents can be produced.
In actual use of the non-contact IC label 1, the output of the data reading device can be increased to a maximum of 1 W (30 dBm), so it goes without saying that the communication distance is further increased.
Further, the electrical property values (permeability, magnetic loss, dielectric constant, dielectric loss, etc.) of the magnetic sheet 10 are made suitable, the impedance matching of the impedance matching circuit unit 22, the thickness of the magnetic sheet 10, By optimizing the shapes of the antenna portion 21 and the ground portion 24, it is considered that the communication distance of the non-contact IC label 1 is further improved even when attached to the container.

As described above, according to the non-contact IC label 1 of the present embodiment, the antenna portion 21 is disposed on the one surface 10a of the magnetic sheet 10 and the ground portion 24 is disposed on the other surface 10b of the magnetic sheet 10 and It arrange | positions on the side surface 10c. Since the antenna unit 21 is arranged in a region occupied by the ground unit 24 in plan view, the ground unit 24 side is attached to a metal plate 32 or an adherend such as a container that can store or empty liquid. Even if attached, the communication distance is less likely to be affected by the adherend side. For this reason, the non-contact IC label 1 can be operated as a monopole antenna when the back surface side (ground portion 24 side) is attached to the adherend.
The ground portion 24 is disposed on the back side of the magnetic sheet 10 when viewed from the one surface 10a side in plan view. Further, the non-contact IC label 1 is formed by laminating magnetic sheets 10, antenna portions 21, ground portions 24, and base materials 26 that are formed in a sheet shape or a film shape. Therefore, the non-contact IC label 1 can be configured to be thin and small.

A through hole 11 is formed in the magnetic sheet 10, and the IC chip 23 is accommodated in the through hole 11. For this reason, the IC chip 23 can be prevented from protruding outward from the one surface 10a, and the appearance of the non-contact IC label 1 can be improved.
For example, when the surface of the non-contact IC label 1 is given a mirror gloss like a hologram, the surface of the non-contact IC label is flat when the IC chip 23 protrudes from one surface 10a of the magnetic sheet 10. However, the reflected light in the specular gloss of the surface is disturbed, and the commercial value of the non-contact IC label is lowered.
If the thickness of the base material 26 covering the IC chip 23 can be made sufficiently thick, the disturbance of reflected light on the surface of the non-contact IC label 1 can be suppressed. However, the non-contact IC label of the present invention is very thin and cannot make the base material 26 thick. Therefore, the through hole 11 for accommodating the IC chip 23 is formed in the magnetic sheet 10 to suppress the disturbance of the reflected light.

The antenna unit 21, the impedance matching circuit unit 22, and the ground unit 24 are integrally printed on the main surface 26a of the substrate 26. Thereby, the antenna unit 21 and the impedance matching circuit unit 22 and the impedance matching circuit unit 22 and the ground unit 24 can be reliably and easily electrically connected, and the productivity of the non-contact IC label 1 can be improved.
Furthermore, even when the antenna unit 21, the impedance matching circuit unit 22, and the ground unit 24 are formed thin, the one surface 10a and the other surface of the magnetic sheet 10 are wound by winding the base material 26 around the magnetic sheet 10. The antenna unit 21, the impedance matching circuit unit 22, and the ground unit 24 can be easily arranged on 10b.

In the present embodiment, the non-contact IC label 2 may be formed as shown in FIG. That is, in this modification, the ground portion 24 is disposed only on the other surface 10 b of the magnetic sheet 10. Furthermore, the impedance matching circuit unit 22 is bent on the one surface 10a, the side surface 10c, the other surface 10b, and the side surface 10c of the magnetic sheet 10 so as to be arranged along the edge portion 10d of the magnetic sheet 10. .
Even if the non-contact IC label 2 is configured in this way, the same effect as the non-contact IC label 1 of the present embodiment can be obtained.

(Second Embodiment)
Next, a second embodiment of the present invention will be described with reference to FIG. 8, but the same parts as those of the above-described embodiment are denoted by the same reference numerals, the description thereof is omitted, and only different points will be described.
As shown in FIG. 8, the non-contact IC label 3 of this embodiment includes a ground portion 41 and the above-described adhesive layer 31 instead of the ground portion 24 of the non-contact IC label 1 of the first embodiment, and includes a magnetic sheet. A stepped portion 12 is formed on the other surface 10 b of 10.

The step portion 12 of the magnetic sheet 10 can be formed by cutting or the like.
The ground part 41 differs from the ground part 24 of the first embodiment only in length.
One end of the ground portion 41 is bent so as to be disposed along the edge portion 10 d of the magnetic sheet 10 on the other surface 10 b and the side surface 10 c of the magnetic sheet 10. The other end of the ground portion 41 is disposed on the stepped portion 12. In this example, the end portion of the base material 26 in which the ground portion 41 is integrally formed with the antenna portion 21 and the impedance matching circuit portion 22 is also disposed in the stepped portion 12.
The surface 10e other than the stepped portion 12 on the other surface 10b of the magnetic sheet 10 and the outer surface 26a of the portion of the base material 26 disposed on the stepped portion 12 are disposed on the same surface.
The adhesive layer 31 is provided over the entire surface 10 e of the magnetic sheet 10 and the outer surface 26 a of the base material 26.

The ground portion 24 of the embodiment is formed such that the antenna portion 21 is disposed in a region occupied by the ground portion 24 in plan view. On the other hand, the ground part 41 of the present embodiment can be configured smaller than the ground part 24.
The non-contact IC label 3 is used by attaching the adhesive layer 31, that is, the back surface of the non-contact IC label 3 to a metal plate 32. When the non-contact IC label 3 is attached to the metal plate 32 and viewed in the thickness direction of the magnetic sheet 10, it is preferable that the antenna unit 21 is disposed in a region occupied by the metal plate 32.

When the non-contact IC label 3 configured in this way is affixed to the metal plate 32 and communication is performed between the non-contact IC label 3 and the data reading device using a radio wave system, the ground portion 41 is arranged on the step 12. The formed portion and the metal plate 32 are capacitively coupled in the region C via the base material 26 and the adhesive layer 31.
If communication is performed in the frequency band of the UHF band, it is sufficient that the area of the portion of the ground portion 41 facing the metal plate 32 is, for example, about ²⁰ to 30 mm ² . At this time, the ground plane as the monopole antenna becomes the metal plate 32 which is an adherend.

As described above, according to the non-contact IC label 3 of the present embodiment, it operates as a monopole antenna, can communicate even when attached to the metal plate 32, and can be formed thin and small. . Note that the non-contact IC label 3 of the present embodiment is not suitable for being attached to a container.
A step portion 12 is formed on the magnetic sheet 10, a ground portion 41 and a base material 26 are disposed on the step portion 12, and the surface 10 e of the magnetic sheet 10 and the outer surface 26 a of the base material 26 are disposed on the same surface. Yes. For this reason, it can prevent that the ground part 41 and the base material 26 protrude from the other surface 10b of the magnetic sheet 10, and can improve the external appearance of the back surface side of the non-contact IC label 3. Also with this configuration, it is possible to suppress the disturbance of reflected light on the surface of the non-contact IC label 3.

  The size in plan view does not change between the non-contact IC label 3 of the present embodiment and the non-contact IC label 1 of the first embodiment. However, since the ground part 41 of the non-contact IC label 3 can be formed shorter than the ground part 24 of the non-contact IC label 1, the manufacturing cost of the non-contact IC label 3 can be reduced compared to the non-contact IC label 1.

In addition, in this embodiment, you may comprise like the non-contact IC label 2 which is a modification in 1st Embodiment. That is, the ground portion 24 is disposed only on the other surface 10 b of the magnetic sheet 10. Then, the impedance matching circuit unit 22 is bent so as to be disposed along the edge 10d of the magnetic sheet 10 on the one surface 10a, the side surface 10c, the other surface 10b, and the side surface 10c of the magnetic sheet 10.
Even if the non-contact IC label 1 is configured in this way, the same effect as the non-contact IC label 3 of the present embodiment can be obtained.

  Further, instead of forming the ground portion 41 on the base material 26 and arranging it on the magnetic sheet 10, the ground portion 41 may be arranged directly on the stepped portion 12 without using the base material 26. In this case, the surface 10e of the magnetic sheet 10 and the outer surface of the ground portion 41 are arranged on the same surface.

(Third embodiment)
Next, a third embodiment of the present invention will be described with reference to FIG. 9 and FIG. 10, but the same parts as those in the above-described embodiment will be denoted by the same reference numerals and the description thereof will be omitted, and only differences will be described. explain.
As shown in FIGS. 9 and 10, the non-contact IC label 4 of the present embodiment has a magnetic sheet 36 and an impedance instead of the magnetic sheet 10 and the impedance matching circuit unit 22 of the non-contact IC label 1 of the first embodiment. A matching circuit unit 37 is provided.

The magnetic sheet 36 includes an antenna-side magnetic sheet 38 disposed between the antenna portion 21 and the ground portion 24, and a chip-side magnetic sheet 39 formed integrally with the antenna-side magnetic sheet 38.
The antenna-side magnetic sheet 38 is made of a material having optimum physical property values (permeability, magnetic loss, dielectric constant, dielectric loss, etc.) for operating as a monopole antenna. On the other hand, the chip-side magnetic sheet 39 is made of a material having a high magnetic permeability and a low magnetic loss in order to efficiently receive the magnetic flux of the magnetic field radiated from the data reader in electromagnetic induction communication, as will be described later. Is used.

The impedance matching circuit unit 37 is formed in a coil shape, and is arranged such that the axis of the entire coil is parallel to the thickness direction of the magnetic sheet 36.
The impedance matching circuit unit 37 is disposed so as not to overlap the antenna unit 21 and the ground unit 24 in a plan view as viewed in the thickness direction of the magnetic sheet 10 shown in FIG. The antenna unit 21 is disposed in an area occupied by the ground unit 24.

The non-contact IC label 4 of the present embodiment configured as described above can be used with the back surface attached to the metal plate 32, like the non-contact IC label 1 of the first embodiment. When this non-contact IC label 4 is affixed to the container, the antenna unit 21 functions as a radiation surface of the monopole antenna and the ground unit 24 functions as a ground surface as in the case of the non-contact IC label 1 described above. The influence of the contents (liquid) of the container which hits the back surface of 24 can be reduced.
On the other hand, as shown in FIG. 10, the impedance matching circuit unit 37 of the non-contact IC label 4 can communicate with the data reader R20 by an electromagnetic induction method. This is because the impedance matching circuit unit 37 and the coil are mutually induced by the magnetic flux M penetrating through the impedance matching circuit unit 37 and the coil (not shown) provided in the data reading device R20. Since the impedance matching circuit unit 37 does not overlap the antenna unit 21 and the ground unit 24 in a plan view, there is nothing to block the magnetic flux M, and communication can be performed by mutual induction effectively.

  Communication using the electromagnetic induction method using radio waves in the UHF band is a communication method that is not easily affected by the dielectric constant and dielectric loss of water and other liquids. It has been adopted. In electromagnetic induction communication, a loop antenna (coil antenna) is generally used in order to effectively receive the magnetic flux of the magnetic field radiated from the data reader R20. For this reason, the impedance matching circuit unit 37 of the present embodiment forms a loop antenna by forming wiring in a loop shape.

In the present embodiment, the magnetic sheet 36 is configured such that the antenna-side magnetic sheet 38 and the chip-side magnetic sheet 39 are integrally formed. However, the magnetic sheet may be configured by arranging the antenna side magnetic sheet 38 and the chip side magnetic sheet 39 side by side without being integrated.
The specifications of such a magnetic sheet may be appropriately selected in order to efficiently manufacture the magnetic sheet.

The first to third embodiments of the present invention have been described in detail with reference to the drawings. However, the specific configuration is not limited to this embodiment, and the configuration does not depart from the gist of the present invention. Changes are also included. Furthermore, it goes without saying that the configurations shown in the embodiments can be used in appropriate combinations.
For example, in the first to third embodiments, the shape of the antenna unit 21 is a rectangular shape. However, the shape is not limited to this, and may be a circular shape, an elliptical shape, a polygonal shape, a meander shape, an array antenna shape, or the like. May be.
The shape of the ground portion 24 is not limited to a rectangular shape, and may be a circular shape, an elliptical shape, a polygonal shape, or the like.

In the first to third embodiments, the antenna portion 21, the impedance matching circuit portion 22, and the ground portion 24 are formed on the main surface 26a of the base material 26. However, these are formed on the main surface 26a. Alternatively, it may be formed by etching or the like.
After the antenna unit 21, the impedance matching circuit unit 22, and the ground unit 24 are formed separately, the antenna unit 21 and the impedance matching circuit unit 22, and the impedance matching circuit unit 22 and the ground unit 24 are electrically connected with solder or the like. Alternatively, the magnetic sheet may be bent along the edge of the magnetic sheet.
Further, the through hole 11 is formed in the magnetic sheet. However, instead of the through hole 11, a recess that is recessed from one surface of the magnetic sheet is formed, and the IC chip 23 is accommodated in the recess. Good.
In the non-contact IC label, when the disturbance of the reflected light on the surface does not become a problem, the through hole or the step portion of the magnetic sheet may not be formed.

  When a non-contact IC label is actually used, although not shown in the figure, a film or paper on which information such as characters and figures for visual or machine reading is written is used to protect the IC chip 23. Also, it may be provided on the side opposite to the magnetic sheet with respect to the communication unit. This information may be written on a film or paper by a printer or the like after a film or the like is provided on the non-contact IC label.

1, 2, 3, 4 Non-contact IC label 10, 36 Magnetic sheet 10a One side 10b The other side 10d Edge 11 Through hole (recess)
12 step portion 21 antenna portion 22, 37 impedance matching circuit portion 23 IC chip 26 base material 31 adhesive layer 32 metal plate (adhered body)
R10, R20 data reader

Claims (11)

A magnetic sheet;
An antenna unit disposed on one surface of the magnetic sheet;
An impedance matching circuit unit disposed on one surface of the magnetic sheet and electrically connected to the antenna unit;
An IC chip provided in the impedance matching circuit section;
A part of the magnetic sheet is disposed on the other surface of the magnetic sheet, is bent so as to be disposed along an edge of the magnetic sheet, and is electrically connected to the impedance matching circuit unit. ,
With
The non-contact IC label, wherein when viewed in the thickness direction of the magnetic sheet, the antenna portion is disposed in a region occupied by the ground portion. A magnetic sheet;
An antenna unit disposed on one surface of the magnetic sheet;
An impedance matching circuit unit disposed on one surface of the magnetic sheet and electrically connected to the antenna unit;
An IC chip provided in the impedance matching circuit section;
A part of the magnetic sheet is disposed on the other surface of the magnetic sheet, is bent so as to be disposed along an edge of the magnetic sheet, and is electrically connected to the impedance matching circuit unit. ,
An adhesive layer that is provided on the other surface of the magnetic sheet and the ground portion, and is bonded to a metal adherend to capacitively couple the ground portion and the adherend via itself,
A non-contact IC label comprising: A magnetic sheet;
An antenna unit disposed on one surface of the magnetic sheet;
A part of the impedance matching circuit unit disposed on one surface of the magnetic sheet and electrically connected to the antenna unit;
An IC chip disposed on one surface side of the magnetic sheet and provided in the impedance matching circuit unit;
A ground portion disposed on the other surface of the magnetic sheet and electrically connected to the impedance matching circuit portion;
An adhesive layer that is provided on the other surface of the magnetic sheet and the ground portion, and is bonded to a metal adherend to capacitively couple the ground portion and the adherend via itself,
With
The non-contact IC label, wherein the impedance matching circuit portion is bent so as to be arranged along an edge portion of the magnetic sheet. The impedance matching circuit portion is formed in a coil shape,
2. The contactless IC label according to claim 1 , wherein when viewed in the thickness direction of the magnetic sheet, the impedance matching circuit unit is disposed so as not to overlap the antenna unit and the ground unit. A step is formed on the other surface of the magnetic sheet,
The ground portion is disposed on the step portion, and a surface other than the step portion on the other surface of the magnetic sheet and an outer surface of the ground portion are disposed on the same surface. The non-contact IC label according to any one of 1 to 4 . A concave portion is formed on one surface of the magnetic sheet,
The IC chip contactless IC label according to claim 1, any one of 5, characterized in that it is accommodated in the recess. The antenna unit, the impedance matching circuit unit, and the ground unit include a film-like substrate integrally formed by printing or etching on its main surface,
Non-contact IC label according to any one of claims 1 to 6, characterized in that the base material in the magnetic sheet is wound. The non-contact IC label according to any one of claims 1 to 3 , wherein a radio wave system is used as a communication system with the data reading device. 5. The non-contact IC label according to claim 4 , wherein a radio wave system and an electromagnetic induction system are used as a communication system with the data reader. A magnetic sheet;
An antenna unit disposed on one surface of the magnetic sheet;
A part of the impedance matching circuit unit disposed on one surface of the magnetic sheet and electrically connected to the antenna unit;
An IC chip disposed on one surface side of the magnetic sheet and provided in the impedance matching circuit unit;
A ground portion disposed on the other surface of the magnetic sheet and electrically connected to the impedance matching circuit portion;
With
The impedance matching circuit section is bent so as to be arranged along an edge of the magnetic sheet,
When viewed in the thickness direction of the magnetic sheet, the antenna portion is disposed in a region occupied by the ground portion ,
The impedance matching circuit portion is formed in a coil shape,
The non-contact IC label , wherein the impedance matching circuit portion is disposed so as not to overlap the antenna portion and the ground portion when viewed in the thickness direction of the magnetic sheet . A magnetic sheet;
An antenna unit disposed on one surface of the magnetic sheet;
A part of the impedance matching circuit unit disposed on one surface of the magnetic sheet and electrically connected to the antenna unit;
An IC chip disposed on one surface side of the magnetic sheet and provided in the impedance matching circuit unit;
A ground portion disposed on the other surface of the magnetic sheet and electrically connected to the impedance matching circuit portion;
With
The impedance matching circuit section is bent so as to be arranged along an edge of the magnetic sheet,
When viewed in the thickness direction of the magnetic sheet, the antenna portion is disposed in a region occupied by the ground portion ,
A step is formed on the other surface of the magnetic sheet,
The ground portion is disposed on the step portion, and a surface other than the step portion on the other surface of the magnetic sheet and an outer surface of the ground portion are disposed on the same surface. IC label.

Images