JP2013058129A - Wireless ic tag - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wireless IC tag having excellent communication characteristics even when attached to a metal object.SOLUTION: A wireless IC tag 1 includes: a wireless IC tag sheet 100 having an IC chip 101 and antennae 102, 102 electrically connected to the IC chip 101; and an auxiliary sheet 110 having a dielectric layer 111, a first conductive part 112 formed on one surface of the dielectric layer 111, and second conductive parts 113, 113 formed on the other surface of the dielectric layer 111. The wireless IC tag sheet 100 is laminated on the other surface of the auxiliary sheet 110 so that at least part of the antennae 102, 102 overlaps with at least part of the second conductive parts 113, 113 in plan view and the IC chip 101 does not overlap with the second conductive parts 113, 113 in plan view. The antennae 102, 102 are electrically isolated from the auxiliary sheet 110.

Description

  The present invention relates to a wireless IC tag.

  In recent years, wireless IC tags have been actively used for the purpose of logistics management and the like. Among them, wireless IC tags using radio waves in the UHF (Ultra High Frequency) band are attracting attention because of their long detection distance and low cost. However, the wireless IC tag using the UHF band radio wave has a problem that the detection distance easily deteriorates due to the influence of surrounding metal objects or dielectrics. Patent Documents 1 and 2 are disclosed as techniques for solving this problem.

  In Patent Document 1, a slot antenna is constituted by a pattern of conductor layers arranged on both surfaces of a sheet-like dielectric, and a wireless IC tag is brought into contact therewith without being electrically joined, and a wireless IC tag is generated by a magnetic field component. And a slot antenna are disclosed. According to this wireless IC tag, it is possible to improve the communication distance.

  In Patent Document 2, a differential patch antenna is configured by a pattern of a conductor layer disposed on both surfaces of a sheet-like dielectric, and a power feeding unit positioned between two patch antennas and an IC chip of a wireless IC tag A wireless IC tag that electrically couples and is disclosed. In the case of this wireless IC tag, even when attached to a metal object, it becomes possible to detect stably.

Japanese Patent No. 4580442 JP 2008-294673 A

  In the conventional wireless IC tag disclosed in Patent Document 1 described above, when the chip portion of the wireless IC tag is close to the conductor layer, the wireless communication characteristics deteriorate. It is necessary to provide a hole or notch in the conductor layer so as to face the chip portion of the IC tag. In this case, in order to design an optimum pattern of holes or notches that do not adversely affect wireless communication characteristics, there is a problem that advanced design techniques are required. Moreover, since the conductor layer having a complicated shape is formed on the dielectric sheet, there is a problem that the manufacturing process becomes complicated.

  On the other hand, in the case of the conventional wireless IC tag disclosed in Patent Document 2, since the conductor layer constituting the differential patch antenna has a simple square shape, it can be easily designed and manufactured. In order to incorporate an IC tag of an IC tag and manufacture it as a unit, there is a problem that a special manufacturing process is required.

  This invention is made | formed in view of such a situation, The main objective is to provide the radio | wireless IC tag which can solve the said subject.

  In order to solve the above-described problem, a wireless IC tag according to one embodiment of the present invention includes an IC chip, a wireless IC tag sheet having an antenna electrically connected to the IC chip, a dielectric layer, and the dielectric layer. An auxiliary sheet having a first conductive portion formed on one surface and a second conductive portion formed on the other surface of the dielectric layer, and the wireless IC tag sheet includes the antenna Other auxiliary sheets so that at least a part of the second conductive part overlaps with at least a part of the second conductive part in a plan view and the IC chip does not overlap with the second conductive part in a plan view. It is laminated on the surface side, and the antenna and the auxiliary sheet are electrically insulated.

  In this aspect, the antenna and the second conductive portion may be configured to be coupled via a magnetic field component.

  In this aspect, it is preferable that the wireless IC tag sheet and the auxiliary sheet are configured to be attachable / detachable.

  In this aspect, the wireless IC tag sheet has a plurality of the antennas, and the auxiliary sheet has a plurality of the second conductive portions corresponding to the antennas, and at least one of each of the plurality of the antennas. And at least a part of each of the plurality of second conductive portions may overlap in plan view.

  In this aspect, the plurality of antennas may be arranged around the IC chip.

  This aspect WHEREIN: It is comprised so that attachment to an attachment target object is carried out by the said auxiliary | assistant sheet | seat side, You may further provide the heat insulation layer formed between the said auxiliary sheet | seat and the said attachment target object.

  In this aspect, the first conductive portion and the second conductive portion may be electrically insulated.

  In this aspect, the second conductive portion may be electrically connected to the first conductive portion.

  According to the wireless IC tag of the present invention, it is possible to provide a wireless IC tag that can be applied to metal objects easily and inexpensively.

3 is a three-side view illustrating a configuration of a wireless IC tag according to Embodiment 1. FIG. Sectional drawing in the AA shown in FIG. FIG. 6 is a three-side view illustrating another configuration of the wireless IC tag according to Embodiment 1. 3 is a three-side view illustrating a configuration of a wireless IC tag according to Embodiment 1. FIG. FIG. 3 is a three-side view illustrating a configuration of an auxiliary sheet according to the first embodiment. 3 is a graph showing detection characteristics of the wireless IC tag according to Embodiment 1. FIG. 3 is a three-side view illustrating a configuration of a wireless IC tag according to Embodiment 2. The side view which shows the structure at the time of attaching the radio | wireless IC tag which concerns on Embodiment 2 to a target object. The top view which shows an example of the structure of the radio | wireless IC tag which concerns on a modification. The top view which shows the other example of a structure of the radio | wireless IC tag which concerns on a modification.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. In addition, each embodiment shown below illustrates the method and apparatus for actualizing the technical idea of this invention, Comprising: The technical idea of this invention is not necessarily limited to the following. Absent. The technical idea of the present invention can be variously modified within the technical scope described in the claims.

(Embodiment 1)
1A and 1B are three views showing the configuration of the wireless IC tag 1 according to the first embodiment. FIG. 1A is a top view, FIG. 1B is a side view, and FIG. 1C is a bottom view. is there. 2 is a cross-sectional view taken along line AA shown in FIG. The wireless IC tag 1 according to the present embodiment is configured by laminating a long plate-shaped wireless IC tag sheet 100 and a long plate-shaped auxiliary sheet 110 having a length and width larger than those of the wireless IC tag sheet 100. ing. Here, the wireless IC tag sheet 100 is stuck on the auxiliary sheet 110 using an adhesive tape (not shown).

  The wireless IC tag sheet 100 includes an IC chip 101 for executing signal processing and two long plate-like antennas 102 and 102 electrically connected to the IC chip 101. Here, the IC chip 101 is provided at the center inside the wireless IC tag sheet 100, and the antennas 102 and 102 are disposed on both sides of the IC chip 101 as a center.

  The auxiliary sheet 110 has a dielectric layer 111 made of a long plate-like dielectric formed with a substantially uniform thickness, a first conductive portion 112 made of a plate-like conductor formed on the lower surface of the dielectric layer 111, and Two second conductive portions 113 and 113 made of a plate-like conductor formed with a substantially uniform thickness on the upper surface of the dielectric layer 111 are provided. The second conductive portions 113 and 113 are arranged side by side in the long side direction of the dielectric layer 111 so as to be separated from each other. A gap 114 is formed between the second conductive parts 113, 113, and a region that is the center of the gap 114 and overlaps with the IC chip 101 in plan view is a power feeding part 115 of the auxiliary sheet 110. Here, the power feeding unit means that a high frequency signal is input to the antennas 102 and 102.

  As a material constituting the first conductive portion 112 and the second conductive portions 113, 113, various materials having conductivity can be used. Specific examples include metals such as aluminum, iron, stainless steel, copper, gold, and silver, or conductive carbon.

  The dielectric layer 111 is made of a non-conductive dielectric, and specifically, a resin material such as polyester, polyethylene, or vinyl chloride, a gas such as air, or a mixture of a resin material and air. It is configured using a certain foamed resin or the like.

  Each of the second conductive portions 113 and 113 is physically joined to the first conductive portion 112 at both ends in the long side direction of the dielectric layer 111. As a result, the first conductive portion 112 and the second conductive portions 113 and 113 are electrically connected. Thus, when the 1st electroconductive part 112 and the 2nd electroconductive part 113,113 are electrically connected, the length of the 2nd electroconductive part 113 is 1/4 of the wavelength of the electromagnetic wave to transmit. A value slightly smaller than this may be a value obtained by dividing the value by the square root of the dielectric constant of the dielectric layer 111. For example, when the wireless IC tag 1 uses UHF band radio waves and the dielectric layer 111 has a relative dielectric constant of 1, the length of each of the second conductive portions 113 and 113 is 4 with a wavelength of 316 mm of UHF band radio waves. What is necessary is just to make it about 65 mm which is a length a little shorter than a part.

  The antennas 102 and 102 and the auxiliary sheet 110 provided in the wireless IC tag sheet 100 are electrically insulated. Each of these antennas 102 and 102 overlaps a part of the second conductive portions 113 and 113 in plan view. On the other hand, the IC chip 101 provided in the wireless IC tag sheet 100 does not overlap the second conductive portions 113 and 113 in plan view. With such a configuration, the antennas 102 and 102 in the wireless IC tag sheet 100 and the second conductive portions 113 and 113 in the auxiliary sheet 110 are coupled via a magnetic field component generated by current. Thereby, the auxiliary sheet 110 functions as an antenna device of the wireless IC tag 1. In the case of the auxiliary sheet 110 functioning as an antenna device in this manner, a substantially uniform and high gain can be obtained over a wide range centering on the power feeding unit 115. Thereby, even if there is something in the vicinity that deteriorates the communication characteristics such as metal, the influence can be suppressed.

  In this embodiment, the auxiliary sheet 110 is larger in both length and width than the wireless IC tag sheet 100. However, as described above, a part of the antennas 102 and 102 and the second conductive parts 113 and 133 are provided. As long as a part of is overlapped in a plan view, these magnitude relations do not matter.

  In the wireless IC tag 1 according to the present embodiment, since the power feeding unit 115 is provided in the gap 114 formed between the two second conductive portions 113 and 113, the IC chip of the wireless IC tag sheet 100 is provided. A certain distance can be ensured between 101 and the second conductive portions 113 and 113. For this reason, it is not necessary to make a special design such as providing a hole or a notch in the conductive part in order to prevent the IC chip and the conductive part from approaching, and a wireless IC tag can be manufactured with a simple design alone. .

  In the case of the wireless IC tag 1 according to the present embodiment, a special manufacturing process is not required, and the wireless IC tag 1 can be easily manufactured by sticking the wireless IC tag sheet 100 and the auxiliary sheet 110. In the case of this embodiment, the wireless IC tag sheet 100 and the auxiliary sheet 110 are attached with an adhesive tape and can be easily peeled off. Therefore, when either the wireless IC tag sheet 100 or the auxiliary sheet 110 is damaged, it can be used again as a wireless IC tag only by replacing the damaged one.

  In the wireless IC tag 1 according to the present embodiment, the first conductive portion 112 and the two second conductive portions 113 and 113 are physically joined at both ends of the dielectric layer 111 in the long side direction. However, the present invention is not limited to this. For example, if the length from the end of the second conductive portion 113, 113 on the power feeding portion 115 side to the electrical junction is compatible with the resonance wavelength, the first conductive portion 112 and the second conductive portion 112 in the other region. The conductive portions 113 and 113 may be physically joined, or may not be physically joined.

  FIG. 3 is a three-view diagram illustrating a configuration example in which the first conductive portion 112 and the second conductive portions 113 and 113 are not physically joined as described above, and FIG. FIG. 3B is a side view, and FIG. 3C is a bottom view. As shown in FIG. 3, the auxiliary sheet 210 included in the wireless IC tag 2 includes two second conductive portions 213 and 213 on the upper surface of the dielectric layer 211 and a first conductive portion 212 on the lower surface thereof. The first conductive portion 212 and the second conductive portions 213 and 213 are not physically joined. In this case, the length of the second conductive portion 213 may be a value obtained by dividing a value slightly smaller than half the wavelength of the transmitted radio wave by the square root of the relative dielectric constant of the dielectric layer 211. Specifically, when a UHF band radio wave is used and the relative permittivity of the dielectric part 211 is 1, the length of each of the second conductive parts 213 and 213 is half of the UHF band radio wave wavelength of 316 mm. The length may be about 150 mm, which is slightly shorter than 1.

  In the wireless IC tag 1 according to the present embodiment, a part of the antennas 102 and 102 in the wireless IC tag sheet 100 and a part of the second conductive portions 113 and 113 of the auxiliary sheet 110 overlap in plan view. However, the present invention is not limited to this. For example, if the antennas 102 and 102 and the second conductive portions 113 and 113 are coupled via a magnetic field component, the entire surface of the antennas 102 and 102 and one of the second conductive portions 113 and 113 are seen in plan view. Or part of the antennas 102 and 102 and the entire surface of the second conductive parts 113 and 113 may overlap.

[Detection characteristics of wireless IC tags]
In order to evaluate the detection characteristics of the wireless IC tag of this embodiment, a specific example based on this embodiment was produced and an evaluation test was performed. The contents and results of this evaluation test will be described below.

  First, the configuration of the wireless IC tag 3 of this embodiment will be described. FIG. 4 is a trihedral view showing the configuration of the wireless IC tag 3, and FIG. 5 is a trihedral view showing the configuration of the auxiliary sheet 310 in this embodiment. 4 (a) and 5 (a) are top views, FIG. 4 (b) and FIG. 5 (b) are side views, and FIG. 4 (c) and FIG. 5 (c) are bottom views. . The wireless IC tag 3 uses a radio wave in the UHF band (950 MHz band, wavelength 316 mm).

  The wireless IC tag sheet 300 is a kanban-sized UHF band rewritable wireless IC tag sheet having a width W1 of 85 mm and a length L1 of 185 mm. In this example, an IC chip 301 and antennas 302 and 302 are incorporated in a rewritable sheet that can be erased and rewritten by heat. In this embodiment, the IC chip 301 is provided at the center inside the wireless IC tag sheet 300, and the antennas 302 and 302 are disposed on both sides of the IC chip 301 as a center. Here, the IC chip 301 and the antennas 302 and 302 are electrically connected.

  The auxiliary sheet 310 includes a dielectric layer 311 made of polyester, a first conductive portion 312 made of aluminum tape, and two second conductive portions 313 and 313. The auxiliary sheet 310 has a thickness D2 of about 6 mm, a width W2 of 60 mm, and a length L2 of 105 mm. The first conductive portion 312 and the second conductive portions 313 and 313 are formed by winding an aluminum tape having a width of 60 mm and a thickness of 0.1 mm around the dielectric layer 311. At this time, the length of each of the second conductive parts 313 and 313 is 65 mm, which is slightly shorter than a quarter of the wavelength of the radio wave in the UHF band, and is the square root of the relative dielectric constant 2.3 of the polyester. It is about 43 mm obtained by dividing. In addition, a gap 314 of about 20 mm is provided between the second conductive portions 313 and 313. A region that is the center of the gap 314 and overlaps with the IC chip 301 in plan view is a power feeding portion 315 of the auxiliary sheet 310.

  The wireless IC tag sheet 300 and the auxiliary sheet 310 are configured so that a part of the antennas 313 and 313 in the wireless IC tag sheet 300 and a part of the second conductive portions 313 and 313 overlap each other in plan view. The IC chip 301 and the second conductive parts 313 and 313 in the tag sheet 300 are stacked so as not to overlap. The wireless IC tag sheet 300 is attached to the upper surface of the auxiliary sheet 310 using an adhesive tape.

  The evaluation of the detection characteristics when the wireless IC tag 3 configured as described above is attached to a metal object will be described below. Here, a wireless IC tag to be evaluated and a metal object are arranged at a certain distance, and a wireless IC tag reader installed at a certain distance from the wireless IC tag detects the wireless IC tag. By confirming the minimum transmission power that can be detected, the detection sensitivity was measured and the detection characteristics were evaluated. In this case, it can be considered that the detection of the wireless IC tag is easier and the detection sensitivity is higher as the minimum transmission power is smaller.

  FIG. 6 is a graph showing a result of comparison of detection characteristics between the wireless IC tag 3 of this embodiment and the conventional wireless IC tag. A conventional wireless IC tag to be compared is composed of only a wireless IC tag sheet having the same configuration as that of the wireless IC tag sheet 300 in this embodiment. In this graph, the horizontal axis indicates the distance between the metal plate and the wireless IC tag, and the vertical axis indicates the minimum transmission power. Further, the circled plots show the detection characteristics of the wireless IC tag 3 of this embodiment, and the square plots show the detection characteristics of the conventional wireless IC tag.

  In the case of the wireless IC tag 3 of this embodiment, a metal plate is attached to the lower surface of the auxiliary sheet 310. Here, since the auxiliary sheet 310 has a thickness of about 6 mm, when a metal plate is attached to the lower surface of the auxiliary sheet 310, the wireless IC tag 3 and the metal plate are separated by about 6 mm. Therefore, for the conventional wireless IC tag to be compared, the detection sensitivity was measured after separating the metal plate from the metal plate by 6 mm.

  As described above, when the distance between the wireless IC tag and the metal plate is 6 mm, the detection sensitivity of the conventional wireless IC tag is 25.5 dBm, as shown in FIG. It can be seen that the wireless IC tag 3 has a detection sensitivity of 14.5 dBm, which is improved by 11 dBm.

  Further, when the distance between the conventional wireless IC tag and the metal plate is increased to 12 mm, 18 mm, 24 mm, and 30 mm, as shown in FIG. 6, it is 20.5 dBm at 12 mm, 17.5 dBm at 18 mm, and 14.5 dBm at 24 mm. 30 mm, it was 12.5 dBm. As described above, in the case of the wireless IC tag 3 of this embodiment, since the detection sensitivity is 14.5 dBm, it has the same detection characteristics as when the conventional wireless IC tag is separated from the metal plate by 24 mm. I understand.

  From these results, it can be confirmed that the wireless IC tag 3 of this embodiment has greatly improved detection characteristics as compared with the conventional wireless IC tag.

(Embodiment 2)
Next, the configuration of the wireless IC tag 4 according to the second embodiment will be described. 7A and 7B are three views showing the configuration of the wireless IC tag 4 according to the present embodiment. FIG. 7A is a top view, FIG. 7B is a side view, and FIG. 7C is a bottom view. is there. FIG. 8 is a side view showing a configuration when the wireless IC tag 4 according to the present embodiment is attached to the object a. The wireless IC tag 4 according to the present embodiment includes a wireless IC tag sheet 400 and an auxiliary sheet 410 as in the wireless IC tag 1 according to the first embodiment. The wireless IC tag sheet 400 is a label seal type IC tag sheet on which information indicating the product number of a product to be managed by a printer can be printed on the upper surface, and an IC chip 401 provided in the center of the inside, The IC chip 401 has two antennas 402 and 402 disposed on both sides of the IC chip 401 and electrically connected to the IC chip 401.

  Similar to the auxiliary sheet 110 according to the first embodiment, the auxiliary sheet 410 according to the present embodiment includes a dielectric layer 411, a first conductive portion 412, and two second conductive portions 413 and 413. ing. The first dielectric part 412 and the second conductive parts 413 and 413 are made of stainless steel. The second conductive portions 413 and 413 are arranged side by side apart in the long side direction of the dielectric layer 411. A gap 414 is formed between the second conductive portions 413 and 413, and a region at the center of the gap 414 that overlaps the IC chip 401 in plan view is a power feeding portion 415 of the auxiliary sheet 410.

  The first conductive portion 412 and the second conductive portions 413 and 413 are coupled to each other via four rod-shaped holding portions 416, 416, 416, and 416 made of a highly heat-resistant dielectric. Each holding portion 416, 416, 416, 416 is disposed in the vicinity of both end portions in the long side direction of the auxiliary sheet 410, and both ends thereof are the upper surface of the first conductive portion 412 and the second conductive portion 413, respectively. Each of them is fixed to the lower surface of 413. Thereby, the distance between the first conductive portion 412 and the two second conductive portions 413 and 413 is maintained. In addition, in this way, the distance between the first conductive portion 412 and the two second conductive portions 413 and 413 is maintained, so that the first conductive portion 412 and the second conductive portions 413 and 413 An air layer having a certain thickness is formed therebetween. The dielectric layer 411 in the present embodiment is constituted by this air layer.

  As described above, the four holding portions 416, 416, 416, 416 are made of a dielectric. Therefore, the first conductive portion 412 and the second conductive portions 413 and 413 are electrically insulated.

  In addition, plate-like spacers 417 and 417 are erected on both ends of the lower surface of the auxiliary sheet 410 in the long side direction so as to incline outwardly downward. As shown in FIG. 8, when the wireless IC tag 4 of the present embodiment is attached to the object a, the lower portions of these spacers 417 and 417 are fixed to the object a. At this time, an air layer b is formed between the first conductive portion 412 and the object a.

  Similarly to the wireless IC tag sheet 100 according to Embodiment 1, the wireless IC tag sheet 400 is attached to the upper surface of the auxiliary sheet 410 with an adhesive tape. Here, the positional relationship between the wireless IC tag sheet 400 and the auxiliary sheet 410 is the same as that of the wireless IC tag sheet 100 and the auxiliary sheet 110 according to the first embodiment, and thus the description thereof is omitted.

[Component management cycle]
Next, a member management cycle using the wireless IC tag 4 according to the present embodiment will be described. First, information for identifying a member such as a member number is printed on the label surface (upper surface) of the wireless IC tag sheet 400 included in the wireless IC tag 4. At this time, similar information is recorded on the IC chip 401. Next, the wireless IC tag sheet 400 and the auxiliary sheet 410 are attached with an adhesive tape. Thereafter, the wireless IC tag 4 according to the present embodiment is attached to the object a to be managed with an adhesive tape, and the object a is conveyed to the manufacturing process.

  In the manufacturing process, information recorded on the IC chip 401 is read by an IC tag reader, whereby the progress status in the manufacturing process is managed. When the assembly or processing of the object a is completed and the product is completed, the wireless IC tag 4 attached to each object a is peeled off from the object a before the product is shipped. At this time, the wireless IC tag sheet 400 and the auxiliary sheet 410 are peeled off, and the wireless IC tag sheet 400 is discarded. The auxiliary sheet 410 is inspected for damage, and if it is not damaged, it is reused by attaching a new wireless IC tag sheet 400.

  In the case of the wireless IC tag 4 according to the present embodiment, the dielectric layer 411 that is an air layer is formed between the first conductive portion 412 and the second conductive portions 413 and 413, and the first conductive portion 412 and the object a. The air layer b is formed between the two. Since air has a high heat insulating effect, these air layers function as heat insulating layers. By providing the two heat insulating layers as in the present embodiment, the wireless IC tag sheet 400 can be protected from heat in the manufacturing process in which the object a has a high temperature. Thereby, the wireless IC tag 4 of the present embodiment can be applied even in a manufacturing process or the like in which the wireless IC tag could not be used so far.

  Further, according to the present embodiment, the auxiliary sheet 410 can be used repeatedly a plurality of times, and a reusable wireless IC tag can be realized simply by replacing the wireless IC tag sheet 400. For this reason, cost can be reduced compared with the conventional wireless IC tag.

  As described above, after the wireless IC tag 4 is peeled off from the object a, the wireless IC tag sheet 400 is peeled off from the auxiliary sheet 410 and discarded. However, the present invention is limited to such a method of use. It is not something. For example, the wireless IC tag sheet 400 may be reused by initializing the IC chip 401 of the wireless IC tag sheet 400. In addition, it is possible to add product information to the IC chip 401 of the wireless IC tag sheet 400 and ship the wireless IC tag sheet 401 together with the product.

  Further, in the present embodiment, the holding portions 416 are disposed at both ends in the long side direction of the auxiliary sheet 410, but the present invention is not limited to this, and the first conductive portion 412 and the first conductive portion 412 As long as the dielectric layer 411 can be formed between the second conductive portions 413 and 413, the holding portion 416 may be disposed anywhere. Of course, the number of holding portions 416 is not limited to four.

  Further, in the present embodiment, the holding portion 416 is made of a dielectric material having high heat resistance, but the present invention is not limited to this. For example, the holding portion 416 may be made of a conductive material. In this case, the first conductive portion 412 and the second conductive portions 413 and 413 are electrically connected.

  Moreover, in this Embodiment, although the dielectric layer 411 is comprised by the air layer, this invention is not limited to this, You may be comprised by dielectrics other than air. In this case, it is not necessary to provide the holding portion 416.

  Further, as in the case of the holding portion 416, the number and installation positions of the spacers 417 are not limited to the above-described modes, and when the wireless IC tag 4 is attached to the target, the auxiliary sheet 410 and the target are between. Other embodiments may be used as long as an air layer can be provided. In place of such an air layer, a heat insulating layer made of a heat insulating material such as glass wool, rock wool, urethane foam, polystyrene foam, or foamed rubber having good heat insulating performance is provided on the lower surface of the auxiliary sheet 410. Thus, the wireless IC tag sheet 400 may be configured to be protected from heat.

(Other embodiments)
Although the wireless IC tag of each of the above embodiments includes two antennas for the wireless IC tag sheet and two second conductive portions for the auxiliary sheet, the present invention is not limited to this. If the auxiliary sheet functions as an antenna device for the wireless IC tag sheet by coupling the antenna and the second conductive part via a magnetic field component, the number of antennas and the second conductive part is not limited. Also good.

  In each of the above embodiments, the two antennas are arranged around the IC chip. However, the present invention is not limited to this. For example, as shown in FIG. 9, an antenna 502 disposed so as to overlap the second conductive portions 513 and 513 in plan view, and an IC chip 501 provided outside the second conductive portions 513 and 513, May be connected. Even in this case, a power feeding part is provided at the center of the gap 514 formed between the second conductive parts 513 and 513, and a signal transmitted from the antenna 502 to the second conductive parts 513 and 513 is transmitted to the power feeding part. It will be sent as a starting point. In addition, as shown in FIG. 10, for example, two pairs of the second conductive portions 613 and 613 are provided, and the antenna is disposed so as to overlap each of the two pairs in plan view. The configuration may be such that 602, 602 and an IC chip 601 provided outside the two pairs are connected. Also in this case, a feeding part is provided at the center of the gaps 614 and 614 formed between the two second conductive parts 613 and 613 of each pair, and the second conductive part 613 and the antennas 602 and 602 are provided. Signals transmitted to each of the two pairs 613 are transmitted starting from those power supply units. In addition, the code | symbol 511 in FIG. 9 and the code | symbol 611 in FIG. 10 have shown the dielectric layer.

  In each of the above embodiments, the wireless IC tag sheet and the auxiliary sheet are attached with an adhesive tape, but the manner of fixing the wireless IC tag sheet and the auxiliary sheet is not limited to this. For example, a holder capable of accommodating a wireless IC tag sheet may be provided on the auxiliary sheet side, and the wireless IC tag sheet and the auxiliary sheet may be fixed by accommodating the wireless IC tag sheet in the holder. In addition, various fixing modes such as fixing the wireless IC tag sheet and the auxiliary sheet with a fixing device such as a clip can be assumed.

  In each of the above embodiments, the wireless IC tag sheet and the auxiliary sheet are laminated in direct contact with each other. However, if the communication characteristics are not hindered, the wireless IC tag sheet and the auxiliary sheet are interposed via other members. Sheets may be laminated.

  The wireless IC tag of the present invention is useful as a wireless IC tag used for various applications such as physical distribution management.

1, 2, 3, 4 Wireless IC tag 100, 200, 300, 400 Wireless IC tag sheet 101, 201, 301, 401 IC chip 102, 202, 302, 402 Antenna 110, 210, 310, 410 Auxiliary sheet 111, 211 , 311, 411, 511, 611 Dielectric layer 112, 212, 312, 412 First conductive part 113, 213, 313, 413, 513, 613 Second conductive part 114, 214, 314, 414, 514, 614 115, 215, 315, 415 Power feeding unit 416 Holding unit 417 Spacer a Object b Air layer

Claims (8)

A wireless IC tag sheet having an IC chip and an antenna electrically connected to the IC chip;
An auxiliary sheet having a dielectric layer, a first conductive portion formed on one surface of the dielectric layer, and a second conductive portion formed on the other surface of the dielectric layer,
In the wireless IC tag sheet, at least a part of the antenna and at least a part of the second conductive part overlap in a plan view, and the IC chip and the second conductive part do not overlap in a plan view. So as to be laminated on the other surface side of the auxiliary sheet,
The antenna and the auxiliary sheet are electrically insulated;
Wireless IC tag. The antenna and the second conductive part are coupled via a magnetic field component,
The wireless IC tag according to claim 1. The wireless IC tag sheet and the auxiliary sheet are configured to be freely attached and detached.
The wireless IC tag according to claim 1 or 2. The wireless IC tag sheet has a plurality of the antennas, and the auxiliary sheet has a plurality of the second conductive parts corresponding to the antennas,
At least a part of each of the plurality of antennas overlaps at least a part of each of the plurality of second conductive portions in plan view,
The wireless IC tag according to claim 1. The plurality of antennas are arranged around the IC chip,
The wireless IC tag according to claim 4. It is configured to be attachable to an attachment object on the auxiliary seat side,
A heat insulating layer formed between the auxiliary sheet and the attachment object;
The wireless IC tag according to claim 1. The first conductive portion and the second conductive portion are electrically insulated.
The wireless IC tag according to claim 1. The second conductive part is electrically connected to the first conductive part.
The wireless IC tag according to claim 1.

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