JP4924379B2 - Non-contact type IC tag and method of manufacturing non-contact type IC tag - Google Patents

Description

  The present invention relates to a contactless IC (Integrated Circuit) tag that performs contactless information communication, and more particularly, to a contactless IC tag formed from a loop antenna and a planar antenna connected to an IC chip with a diversity function, and its manufacture. Regarding the method.

  In recent years, non-contact type IC tags used for information storage and display in contact with reader / writers in process management, logistics management, distribution fields, etc. in factories such as manufacturing have become IC tag labels, packages, and cases. It is used for a wide range of purposes as tags to be attached.

In recent years, in addition to the conventional 13.56 MHz band or microwave band (2.45 GHz) non-contact IC tag, it has become possible to use the UHF band (952 M to 955 MHz) in Japan due to the revision of the law. UHF band non-contact IC tags are being put to practical use.
The UHF band IC tag can be collectively read from a long distance (3 to 5 meters) as compared to the electromagnetic induction type 13.56 MHz band non-contact IC tag. Further, the microwave band IC tag can communicate at a distance of 1 to 1.5 meters, and is expected to be widely used in applications that take advantage of these features in the future.

  Incidentally, in recent years, IC chips having a diversity function have been supplied. The diversity function means that the IC chip has a built-in switch mechanism for the antenna, and has a function (circuit) that determines the strength of the input power of the two antennas and automatically selects the stronger one. . The diversity function is generally used for mobile phone devices, in-vehicle antennas, various mobile communication terminals, and the like.

Conventionally, a loop-shaped planar antenna is known as an antenna that transmits and receives radio waves (circularly polarized waves) to and from an IC chip (see, for example, Patent Document 1).
FIG. 5 is a diagram showing a conventional circularly polarized loop antenna, FIG. 5 (a) is a diagram showing a left-handed circularly polarized loop antenna 55a, and FIG. 5 (b) is a right-handed circle. It is a figure which shows the loop antenna 55b for polarization.
As shown in FIG. 5, a perturbation element 56 is provided in the loop antenna 55, and the perturbation element 56 causes a phase difference of 90 ° between horizontal polarization and vertical polarization to convert linear polarization into circular polarization. To do. As shown in FIG. 5A, the loop antenna 55a becomes a right-handed circularly polarized loop antenna, and as shown in FIG. 5B, the loop antenna 55b becomes a left-handed circularly polarized loop antenna.

  Also disclosed is a loop antenna that can selectively transmit and receive a right-hand circularly polarized loop antenna and a left-hand circularly polarized loop antenna in right-handed circular polarization and left-handed circular polarization. (For example, refer to Patent Document 2).

Japanese Patent Laid-Open No. 11-205028 JP 11-97926 A

However, none of the conventional antennas can transmit and receive left-hand circularly polarized waves and right-handed circularly polarized waves simultaneously. In the loop antenna disclosed in Patent Document 2, one of the first and second feeding conductors is selectively used, and as a result, it is difficult to obtain a sufficiently good circular polarization characteristic in a wide band. It was. In order to be able to transmit and receive both left-hand circularly polarized waves and right-handed circularly polarized waves, there is a problem that it occupies space and is expensive.
The non-contact type IC tag receives a predetermined signal from the reader / writer and transmits a reply signal to be returned to communicate information with the reader / writer. The non-contact type IC tag and the reader / writer Depending on the positional relationship, the communication sensitivity is significantly reduced. Transmission / reception of various data of the non-contact type IC tag by R / W is influenced by the reading direction with respect to the antenna, and communication may be impossible depending on radio waves. For example, when performing batch reading of data of non-contact type IC tags attached to a plurality of packages, products, etc., there is a problem that non-contact type IC tags that cannot be read at a time are generated.

  The present invention has been made in view of the above points, and by using an IC chip having a diversity function, it is possible to simultaneously transmit and receive a left-handed circularly polarized wave and a right-handed circularly polarized wave, thereby providing a good communication state in a wide band. An object is to provide a non-contact type IC tag to be secured.

The first invention to achieve the above object, connected to the planar antenna of the closed loop-shaped composed of independent conductors, a first loop antenna that will be disposed on the base film, the first loop antenna And an IC chip having a diversity function , and an inlet connected to the IC chip and arranged vertically to the first loop antenna , the IC tag comprising: , the relative planar antenna, said first loop antenna and the perimeter of the second loop antenna and the peripheral edge of the planar antenna is disposed in a position parallel proximity, the IC chip, the reception intensity in response to said first and a loop antenna used to select switching between said second loop antenna, the planar antenna, the Inre' Are arranged in parallel with each other, and a pair of perturbation element portions are provided diagonally at the corners of the planar antenna to form a circularly polarized antenna. 1 wavelength, the length between the perturbation elements is about ½ wavelength, the length from one perturbation element to the vicinity of the IC chip is about 3/8 wavelength, the length from the vicinity of the IC chip to the other perturbation element Is a non-contact type IC tag characterized by having about 1/8 wavelength .

The first invention, the impedance of the plane antenna in proximity to the selected first loop antenna and the second loop antenna in accordance with the reception intensity, matching between the impedance of the IC chip is taken It is desirable that
The planar antenna is preferably formed on the back surface of the object.
Further, the planar antenna is comprised of two substantially rectangular, with a cutout portion at one corner of each square, Ri loop antenna der formed through the notch from one another, the inlet, the it is desirable to position the near planar antenna corner portions corresponding to the notches.

The “IC chip” includes a control unit, a memory unit for storing information, a non-contact type IC wireless communication unit, and the like.
The “inlet” is a primary processed member before the exterior base material is disposed.
“Diversity function” means that a switch mechanism for an antenna is built in a chip, and has a function (circuit) that determines the strength of input power of two antennas and automatically selects the stronger one. .
The “perturbation element portion” is a pair of conductive metal plates diagonally.

Non-contact IC tag according to the first invention, the planar antenna of the closed loop-shaped composed of independent conductors, the base film, a first loop antenna that will be disposed on the base film, connected to the first loop antenna An IC chip having a diversity function , and an inlet having a second loop antenna connected to the IC chip and arranged vertically to the first loop antenna , wherein the inlet With respect to the planar antenna, the outer sides of the first loop antenna and the second loop antenna and the peripheral edge of the planar antenna are disposed in parallel and close to each other, and the IC chip is arranged in accordance with the reception strength. The antenna is switched between the second loop antenna and the second antenna , and the planar antenna has a linear shape in the portion juxtaposed with the inlet. A pair of perturbation element portions are provided diagonally at the corners of the surface antenna to form a circularly polarized antenna. The planar antenna further has a circumference of one wavelength and a length between the perturbation elements of about 1 /. Two wavelengths, the length from one perturbation element to the vicinity of the IC chip is about 3/8 wavelength, and the length from the vicinity of the IC chip to the other perturbation element is about 1/8 wavelength .

In the first invention, the received signal can be transmitted / received at the same time regardless of whether it is a left-handed circularly polarized wave or a right-handed circularly polarized wave. It is possible to match to the polarized wave, and highly sensitive communication can be realized.
To reduce the reading loss of data of the non-contact type IC tag in batch reading for the non-contact type IC tag provided for the article, and to reduce the work burden and time required for specifying the non-contact type IC tag that could not be read. Is possible.
Further, by using a planar antenna composed of two squares, a wide directivity can be obtained with a small antenna.
Furthermore, by attaching a planar antenna to the back side of the article, the surface printing is not eroded and the design of the article is not impaired.

Further, the second invention includes a closed loop planar antenna composed of independent conductors, a base film, a first loop antenna, a second loop antenna, and the first loop antenna according to reception strength. a method of manufacturing a non-contact IC tag and a inlet having an IC chip, having a diversity function for selecting switching between said second loop antenna, and step (a) of forming the planar antenna, the The first loop antenna and the second antenna are disposed on a base film, the IC chip is connected to the first loop antenna and the second antenna, and the first loop antenna is connected to the first loop antenna via the IC chip. by the loop antenna and the second antenna arranged vertically, (b) forming said inlet, said planar antenna (C) forming the body, the inlet, to said planar antenna, said first loop antenna and the perimeter of the second loop antenna and the peripheral edge of the planar antenna are close parallel position arranged to include a step (d) of mounting, wherein the step (a) portion is juxtaposed with the inlet forms a pattern of the planar antenna such that the linear shape, the planar antenna A circularly polarized antenna is provided by providing a pair of perturbation element portions diagonally at the corner, and the circumference length is one wavelength, the length between the perturbation elements related to the planar antenna is about ½ wavelength, The planar antenna pattern is formed so that the length from one perturbation element to the vicinity of the IC chip is about 3/8 wavelength, and the length from the vicinity of the IC chip to the other perturbation element is about 1/8 wavelength. It is characterized by A method for producing a non-contact type IC tag.

  The second invention is an invention relating to a method of manufacturing a non-contact type IC tag according to the first invention.

  The present invention has been made in view of the above points, and by using an IC chip having a diversity function, it is possible to simultaneously transmit and receive a left-handed circularly polarized wave and a right-handed circularly polarized wave, thereby providing a good communication state in a wide band. A non-contact type IC tag or the like to be secured can be provided.

  Hereinafter, preferred embodiments of a non-contact type IC tag according to the present invention will be described in detail with reference to the accompanying drawings. In the following description and the accompanying drawings, the same reference numerals are given to components having substantially the same functional configuration, and redundant description will be omitted.

FIG. 1 is a plan view showing a non-contact type IC tag 1 according to the present embodiment.
FIG. 2 is an exploded perspective view of the non-contact type IC tag 1.

  1 and 2 show an example of a non-contact type IC tag 1. As shown in FIGS. 1 and 2, the non-contact type IC tag 1 includes an inlet 10 and a planar antenna 11.

The inlet 10 includes a base film 2, an IC chip 3, a first loop antenna 4, a second loop antenna 5, and the like. A substantially rectangular loop antenna is disposed on the base film 2, and the IC chip 3 electrically connected to the first loop antenna 4 is connected to the IC chip 3, and the first loop antenna is connected. An inlet 10 is formed from a substantially loop-shaped second loop antenna 5 disposed substantially perpendicularly to 4.
The IC chip 3 has a diversity function, and amplifies the received waves of the first loop antenna 4 and the second loop antenna 5 to determine their strengths and performs switching by a switch mechanism. The two amplifier circuits of the IC chip 3 are required to have the same electrical characteristics such as amplification characteristics and frequency characteristics in order to accurately perform the determination.

The planar antenna 11 is a closed loop antenna composed of independent conductors, and includes an antenna 6, a perturbing element unit 7, and the like. The antenna 6 is a loop antenna formed from a substantially square shape (for example, two substantially square shapes), and a pair of perturbation element portions 7 are provided at the corners of the antenna 6 to form a circularly polarized antenna. , By the perturbation element unit 7.
In the present embodiment, the antenna 6 is a loop antenna formed from a substantially square shape (for example, two substantially square shapes). However, the present invention is not limited to this, and the antenna 6 has a linear shape in a portion juxtaposed with the inlet 10. A loop antenna that is parallel may be formed. That is, the antenna 6 may have an arbitrary shape except for a portion juxtaposed with the inlet 10.

As shown in FIG. 2, for example, the planar antenna 5 is composed of two substantially squares, each of which has a notch 9 at one corner and is formed through the notch 9. The planar antenna 5 has a circumference of one wavelength, a length between the perturbation element portions 7a and 7b of about 1/2 wavelength, and a length from one perturbation element portion 7a to the vicinity of the IC chip of about 3 / 8 wavelengths, and the length from the vicinity of the IC chip to the other perturbing element 7b is about 1/8 wavelength.
For example, when the UHF band is 954 MHz, one wavelength is 31.4 cm, and a half wavelength is 15.7 cm. When the condition is satisfied, resonance with radio waves is efficiently generated. The planar antenna 5 has, for example, a length between the perturbation element portions 7a and 7b of about 16 cm, a length from one perturbation element portion 7a to the vicinity of the IC chip, and a length from the vicinity of the IC chip to the other perturbation element 7b. The length is about 4 cm.

A planar antenna 11 is formed on the packaging back surface of the article 8. The planar antenna 11 includes, for example, a pattern printed with conductive ink or a pattern obtained by etching a metal foil laminated on the base film 2.
On the packaging surface of the article 8, the inlet 10 is in the vicinity of the corner of the flat antenna corresponding to the notch 9, and the outer edges of the first loop antenna 4 and the second loop antenna 5 are parallel to the periphery of the antenna 6. It arrange | positions so that it may become a close position (-1 mm-3 mm).
In addition, in this Embodiment, although the inlet 10 was formed in the packaging surface of the articles | goods 8, you may overlap and form with the planar antenna 11 on the packaging back surface of an article | item. This further reduces erosion to surface printing.

  The non-contact type IC tag 1 switches and selects the first loop antenna 4 and the second loop antenna 5 by the switch mechanism according to the reception strength by the diversity function of the IC chip 3. The impedance of the planar antenna 11 close to the selected first loop antenna 4 / second loop antenna 5 and the impedance of the IC chip 3 are adjusted to match the impedance of the planar antenna 11 and the IC chip 3. Match the impedance.

In this embodiment, as a method for attaching the non-contact type IC tag 1, the planar antenna 6 is formed on the back surface of the object and the inlet 10 is attached to the front surface. However, the inlet 10 is attached to the top surface of the seal type planar antenna 11. Superposition may be applied.
The planar antenna 11 is disposed on the base material 19 and temporarily adhered to the back surface of the base material while applying the adhesive to the release paper 23. The outer periphery of the first loop antenna 4 and the second loop antenna 5 and the periphery of the antenna 6 are close to each other in the vicinity of the corner of the planar antenna corresponding to the notch 9 on the upper surface of the seal type planar antenna 11. The inlet 10 is arranged so as to be in a position where the contactless IC tag 1 is formed. By making the non-contact type IC tag 1 into a configuration of a seal type non-contact type IC tag 1 that can be freely attached to the object 8 like a general seal, the manufacturing and pasting work of the non-contact type IC tag is simplified. be able to.

  Next, a manufacturing method of the non-contact type IC tag 1 of the present embodiment will be described with reference to FIGS.

FIG. 3 is a flowchart showing a method for manufacturing the non-contact type IC tag 1.
4 is a cross-sectional view of the manufacturing process of the non-contact type IC tag 1, FIG. 4 (a) is a cross-sectional view of the inlet 10 temporarily attached to the surface release paper 14, and FIG. 4 (b) FIG. 4C is a cross-sectional view of the planar antenna 11 temporarily attached to the release paper 14, and FIG. 4C is a cross-sectional view of the non-contact IC tag 1 formed on the object 8.

  First, the first loop antenna 4 and the second loop antenna 5 are disposed on the base film 2, and the IC chip 3 having a diversity function is mounted and connected to form the inlet 10. The first loop antenna and the second loop antenna 5 are vertically arranged via the IC chip 3 (step S301).

  Next, the surface protective film 22 made of a white film / paper substrate is laminated on the entire upper surface of the inlet 10 formed on the IC chip 3 side through the adhesive layer 21 made of an adhesive (step S302).

  Next, as shown in FIG. 4A, the adhesive film 21 is temporarily attached to the inlet 10 through the adhesive layer 21 while applying an adhesive to the release paper 23 on the surface of the base film 2 opposite to the IC chip 3. (Step S303).

Next, as shown in FIG. 4B, the planar antenna 11 including the antenna 6 and the perturbing element unit 7 is formed on the base material 19 (step S304). The antenna 6 has two substantially rectangular shapes, and a perturbation element portion 7 that is a pair of conductive metal plates is provided diagonally at a corner portion of the antenna 6. The planar antenna 11 includes, for example, a pattern obtained by etching a metal foil laminated on the base material 19 or a pattern printed with conductive ink.

  Next, as shown in FIG.4 (c), the planar antenna 11 is stuck on the back surface of the object 8 (packaging material) via the adhesive layer 21 (step S305), and close to the antenna 6 formed on the back surface. The inlet 10 is stuck at a predetermined position on the surface of the object 8 corresponding to the position (step S306).

  Next, various constituent materials used for the non-contact type IC tag 1 of the present invention will be described.

As the base film 2 and the base material 19 which are base materials of the inlet 10, PET (polyethylene terephthalate), PET-G (terephthalic acid-cyclohexanedimethanol-ethylene glycol copolymer), PP (polypropylene), PE (polyethylene) , PC (polycarbonate), PA (polyamide), PPS (polyphenylene sulfide), polyvinyl chloride, vinyl chloride-vinyl acetate copolymer, cellulose diacetate, cellulose triacetate, polystyrene, ABS, polyacrylate, polyethylene, A material such as polyurethane is used.

  The first loop antenna 4, the second loop antenna 5, the antenna 6, and the perturbing element unit 7 are conductor patterns, and materials such as aluminum and silver paste are used.

  Moreover, as the surface protection film 22, a white film, a paper base material, etc. are used. As the white film, those mentioned in the above base film 2 can be used, and as the paper base material, high-quality paper, coated paper, craft paper, glassine paper, synthetic paper, latex, melamine-impregnated paper, and the like can be used.

  As described above, according to the embodiment of the present invention, the non-contact type IC tag 1 includes the inlet 10 and the planar antenna 11, and the inlet 10 is formed on the base film 2 with a substantially rectangular loop. An IC chip 3 having a diversity function connected to the first loop antenna 4a, a loop antenna 4 having a shape, and an IC chip 3 connected to the IC chip 3 and arranged substantially perpendicular to the first loop antenna 4 A second loop antenna 5 having a square loop shape is formed. The planar antenna 11 is a closed loop antenna composed of independent conductors, and includes an antenna 6, a perturbing element unit 7, and the like. The antenna 6 is formed of two substantially rectangular shapes, and a pair of perturbation element portions 7 are provided diagonally at the corner portions. A planar antenna 11 is formed on the packaging back surface of the article 8, and the inlet 10 is disposed on the packaging surface of the article 8 in the vicinity of the corner of the planar antenna corresponding to the notch 9, and the first loop antenna 4 and the second loop antenna. 5 and the periphery of the antenna 6 are arranged in parallel.

As a result, the received signal can be transmitted and received simultaneously with either left-handed circular polarization or right-handed circular polarization, and it is possible to obtain good circular polarization characteristics without being affected by the direction of the radio wave. Can be matched, and highly sensitive communication can be realized.
To reduce the reading loss of data of the non-contact type IC tag in batch reading for the non-contact type IC tag provided for the article, and to reduce the work burden and time required for specifying the non-contact type IC tag that could not be read. Is possible.
Further, by using a planar antenna composed of two squares, a wide directivity can be obtained with a small antenna.
Furthermore, by attaching a planar antenna to the back side of the article, the surface printing is not eroded and the design of the article is not impaired.

  The preferred embodiment of the non-contact type IC tag 1 according to the present invention has been described above with reference to the accompanying drawings, but the present invention is not limited to such an example. It will be apparent to those skilled in the art that various changes or modifications can be conceived within the scope of the technical idea disclosed in the present application, and these are naturally within the technical scope of the present invention. Understood.

The figure which shows the non-contact-type IC tag 1 which concerns on this Embodiment An exploded perspective view of the non-contact type IC tag 1 Flow chart showing a method for manufacturing the non-contact type IC tag 1 FIG. 4A is a cross-sectional view of the manufacturing process of the non-contact type IC tag 1, FIG. 4A is a cross-sectional view of the inlet 10 temporarily attached to the surface release paper 14, and FIG. FIG. 4C is a cross-sectional view of the contactless IC tag 1 formed on the object 8. Diagram showing a conventional circularly polarized loop antenna

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ......... Non-contact type IC tag 2 ......... Base film 3 ......... IC chip 4 ......... First loop antenna 5 ......... Second loop antenna 6 ......... Antenna 7 ......... Perturbation element Part 8 ......... Object 9 ......... Notched part 10 ......... Inlet 11 ......... Plane antenna 19 ......... Base material 21 ......... Adhesive layer 22 ......... Surface protection film 23 ......... Release paper

Claims (7)

A closed-loop planar antenna composed of independent conductors;
First loop antenna that will be disposed on the base film, is connected to the first loop antenna, an IC chip having the diversity function, and connected to said IC chip, they are arranged perpendicular to the first loop antenna an inlet having a second loop antenna, the that,
An IC tag comprising
The inlet, relative to the planar antenna, said first loop antenna and the perimeter of the second loop antenna and the peripheral edge of the planar antenna is disposed in a position parallel proximity,
The IC chip is for switching and selecting the first loop antenna and the second loop antenna according to reception strength ,
In the planar antenna, a portion juxtaposed with the inlet has a linear shape, and a pair of perturbation element portions are provided diagonally at the corners of the planar antenna to form a circularly polarized antenna.
The planar antenna further has a circumference of one wavelength, a length between the perturbation elements of about 1/2 wavelength, a length from one perturbation element to the vicinity of the IC chip of about 3/8 wavelength, A non-contact type IC tag characterized in that the length from the vicinity of the IC chip to the other perturbation element is about 1/8 wavelength . According to the impedance of the planar antenna in proximity to the selected first loop antenna and the second loop antenna according to the reception intensity, characterized in that the matching between the impedance of the IC chip is taken Item 2. A non-contact type IC tag according to item 1 . The non-contact type IC tag according to claim 1 , wherein the planar antenna is formed on a back surface of an object. The planar antenna is comprised of two substantially rectangular, with a cutout portion at one corner of each square, Ri loop antenna der formed through the notch from one another, the inlet lacks the cut non-contact type IC tag according to claim 1, wherein the located near the planar antenna corner portions corresponding to the parts. A closed loop planar antenna composed of independent conductors, a base film, a first loop antenna, a second loop antenna, and the first loop antenna and the second loop antenna according to reception strength. An inlet having an IC chip having a diversity function of switching selection, and a non-contact type IC tag manufacturing method comprising:
(A) forming the planar antenna,
The first loop antenna and the second antenna are disposed on the base film, the IC chip is connected to the first loop antenna and the second antenna, and the first loop antenna and the second antenna are connected to each other through the IC chip. (B) forming the inlet by vertically arranging one loop antenna and the second antenna ;
Forming the planar antenna on an object (c);
Said inlet, to said planar antenna, disposed at a position where the periphery of the first loop antenna and the outer side plane antenna of the second loop antenna are close parallel, the step of attaching (d )When,
Including
In the step (a), the planar antenna pattern is formed so that a portion juxtaposed with the inlet has a linear shape, and a pair of perturbation element portions are provided diagonally at the corners of the planar antenna. The wave antenna has a circumference of 1 wavelength, a length between the perturbation elements of the planar antenna of about 1/2 wavelength, and a length from one perturbation element to the vicinity of the IC chip of about 3 A method of manufacturing a non-contact type IC tag , wherein the pattern of the planar antenna is formed so that the length from the vicinity of the IC chip to the other perturbation element is about 1/8 wavelength . 6. The method of manufacturing a non-contact type IC tag according to claim 5 , wherein the step (c) forms the planar antenna on the back surface of the object . The step (a) includes two substantially square shapes, each having a notch at one corner of each square, and the two rectangles are in a closed loop shape continuously provided via the notches. Forming a pattern of planar antennas,
Wherein step (d), the inlet, the manufacturing method of the non-contact IC tag according to claim 5, wherein placing the near planar antenna corner portions corresponding to the notch.

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