JP5437623B2 - IC tag - Google Patents

Description

  The present invention relates to an IC tag, and more particularly to an IC tag having a structure in which an antenna terminal and an enlarged electrode of an IC chip are connected by a strap.

  An IC tag is also referred to as RFID (Radio Frequency Identification), and includes an IC chip that holds information capable of identifying an individual, and can exchange data with an external reader / writer without contact with the information. It is. Such IC tags are used in fields such as transportation and distribution, warehouses, factory process management, and handling of luggage.

  As such an IC tag, there is known an IC tag provided with a coiled antenna having a pair of terminals formed on a base material, and an IC chip and a bridge for electrically connecting the antenna and the IC chip. Yes. A bridge is a conductive member that connects a pair of terminals of a coiled antenna and a pair of electrodes of an IC chip, and is arranged so as to intersect with the coiled antenna (for example, JP-A-2007- No. 157025). This bridge has a structure in which, except for both ends, which are connecting portions, are electrically cut off by a synthetic resin coating or the like in order to prevent a short circuit with an intersecting antenna.

  In contrast to the conventional IC tag as described above, an IC tag using a so-called strap capable of integrally mounting an IC chip on a substrate and performing a bridge process is being developed. The strap has a structure in which an IC tag and an enlarged electrode of a pair of IC chips are mounted on a strip-shaped base material having a bridge function. Therefore, by disposing the enlarged electrodes of the strap so as to be connected to the terminals at both ends of the coiled antenna, it is possible to simultaneously mount the IC chip and to electrically connect the antenna and the IC chip. Moreover, since the strap having the enlarged electrode has a certain size, it can be easily mounted on the base material compared to mounting a fine IC chip on the base material with high accuracy, so that productivity is improved. There are also benefits.

However, the IC tag having the strap as described above has the following disadvantages in structure. When the terminals at both ends of the antenna are connected by a strap having an enlarged electrode of the IC chip, the strap and the antenna intersect each other, and the enlarged electrode of the strap and the antenna are arranged close to each other. Therefore, the IC tag having the strap has a disadvantage that it has a structure that is highly likely to cause a direct contact between the enlarged electrode of the IC chip and the antenna, that is, a short circuit.
JP 2007-157025 A

  The present invention has been made in view of these disadvantages, and the IC chip, the strap having the enlarged electrode, and the antenna terminal are reliably electrically connected, and the short-circuit between the enlarged electrode and the antenna is reliably prevented. An object is to provide an IC tag that can be used.

The invention made to solve the above problems is
An antenna sheet in which a coiled antenna and a pair of planar antenna terminals at both ends thereof are laminated on the mating surface side of the sheet-like base material;
A strap on which an IC chip is mounted, a pair of planar enlarged electrodes extending from the left and right sides of the IC chip are stacked on the mating surface side of the strip-shaped substrate, and superimposed on the antenna sheet;
An IC tag comprising an antenna sheet and an adhesive layer filled between the strap and
The coiled antenna is disposed in a spiral shape having a concave planar shape in which the side on which the pair of antenna terminals is disposed is recessed toward the center side of the sheet-like base material, and the strap is the spiral shape. Are arranged so that the pair of enlarged electrodes and the pair of antenna terminals match,
In the antenna terminal region of the antenna sheet or the enlarged electrode region of the strap, a convex portion having a substantially conical shape with a hemispherical tip is formed protruding to the mating surface side,
With this convex portion, the pair of antenna terminals and the pair of enlarged electrodes are in direct contact,
The adhesive layer has a greater thickness between the coiled antenna and the strap than between the antenna terminal and the strap in the peripheral portion of the convex portion,
An IC tag characterized in that a plurality of the convex portions are formed in a substantially square lattice pattern in a scattered manner.

  The IC chip is preferably disposed on the mating surface side of the strip-shaped substrate, and an adhesive layer is provided between the IC chip and the antenna sheet. Moreover, the convex portion may be formed by pressing from the back side of the antenna sheet. The adhesive layer is preferably provided in a wider range than the strap. Furthermore, it is preferable to form a plurality of convex portions in a scattered manner in the antenna terminal region of the antenna sheet or the enlarged electrode region of the strap.

  In the present invention, “antenna terminal region” refers to the antenna terminal of the antenna sheet and its peripheral portion, and “enlarged electrode region” refers to the enlarged electrode of the strap and its peripheral portion. The “coiled shape” means a spiral shape arranged in a plane. Further, the “sheet-like substrate” may be a belt-like continuous body during production.

  According to the IC tag of the present invention, since the convex portion protruding to the mating surface side is formed in the antenna terminal region of the antenna sheet or the enlarged electrode region of the strap, the convex portion serves as a contact, The electrical connection with the enlarged electrode can be ensured. Further, according to the IC tag, since the convex portion is formed, the strap is pushed up relatively with respect to the antenna sheet, and the adhesive layer is thickened to ensure the contact between the antenna and the enlarged electrode. Prevention, that is, short circuit due to contact between the enlarged electrode and the antenna can be prevented.

  Further, according to the IC tag in which the IC chip is disposed on the mating surface side of the strap-shaped base material of the strap and the adhesive layer is provided between the IC chip and the antenna sheet, the IC chip is in the shape of the strap strip. Since it is covered with the base material, the IC chip is hardly detached, and durability against pressure, heat, bending, etc. applied from the outside is improved. Further, according to the IC tag, since the adhesive layer is provided between the IC chip and the antenna sheet, the contact between the antenna sheet and the IC chip can be surely prevented, so that the IC chip is damaged. Can be prevented.

  Further, according to the IC tag provided by pressing the convex portion from the back side of the sheet-like base material, the convex portion is protected while protecting the antenna disposed on the surface of the sheet-like base material. Since it is formed, the product yield of the IC tag can be improved.

  Furthermore, according to the IC tag in which the adhesive layer is provided in a wider range than the strap, the contact between the strap and the antenna can be more reliably prevented, and the strap and the antenna sheet are highly adhesive. be able to.

  In addition, according to the IC tag in which a plurality of convex portions are formed in a scattered manner in the antenna terminal area of the antenna sheet or the enlarged electrode area of the strap, the electrical connection between the antenna terminal and the enlarged electrode is more reliable. In addition, since the gap between the antenna and the enlarged electrode is further widened by the plurality of scattered convex portions and the adhesive flowing in between them increases, the contact between the antenna and the enlarged electrode can be more reliably prevented, Short circuit can be prevented.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings as appropriate. FIGS. 1A and 1B are a schematic plan view and a partial cross-sectional view taken along line AA of an IC tag according to an embodiment of the present invention, and FIGS. 3 is a schematic partial cross-sectional view showing the manufacturing process of the IC tag, FIG. 3 is a schematic diagram showing the IC tag manufacturing apparatus of FIG. 1, FIG. 4 is a partially enlarged view showing the press anvil and the periphery of the manufacturing apparatus of FIG. 1 is a schematic partial cross-sectional view showing an IC tag according to an embodiment different from the IC tag of FIG. 1, and FIG. 6 is a schematic partial cross-sectional view showing an IC tag according to an embodiment different from the IC tag of FIGS. is there.

  The IC tag 1 of FIG. 1 includes an antenna sheet 2, a strap 3, and an adhesive layer 4.

  The antenna sheet 2 includes a sheet-like substrate 5, a coiled antenna 6 and a pair of antenna terminals 7 that are stacked on the mating surface side of the sheet-like substrate 5. Note that the antenna terminal 7 and its peripheral portion in the antenna sheet 2 are referred to as an antenna terminal region 8.

  The sheet-like base material 5 is a substantially rectangular sheet body. The size of the sheet-like substrate 5 can be set as appropriate according to the use application of the IC tag 1. For example, the size is 54 mm long and 85. Designed to be 6 mm in size. Moreover, as thickness of the sheet-like base material 5, 20 micrometers or more and 100 micrometers or less are preferable. By setting the thickness of the sheet-like base material 5 within the above range, the convex portion 9 can be easily formed by pressing from the back surface of the antenna sheet 2 described later.

  The material of the sheet-like substrate 5 is not particularly limited as long as it has a certain elasticity and plasticity and does not interfere with radio waves for communication, but from the viewpoint of processability, portability, economy, etc. For example, synthetic resins such as polyvinyl chloride, polycarbonate, polypropylene, nylon, and polyethylene terephthalate are preferable.

  The coiled antennas 6 are spirally arranged at substantially equal intervals along the outer peripheral edge of the surface of the sheet-like substrate 5. The number of turns of the coiled antenna 6 is appropriately set according to the frequency, intensity, etc. of the radio wave used for communication.

  The pair of antenna terminals 7 are disposed at both ends of the coiled antenna 6. The antenna terminal 7 is formed in a predetermined planar shape. The pair of antenna terminals 7 are arranged inside and outside the bundle of coiled antennas 6 arranged in a spiral shape, but considering the arrangement of the strap 3 described later, the center of the short side of the sheet-like substrate 5 One antenna terminal 7 is disposed outside, and the other antenna terminal 7 is disposed on the inner side of the coiled antenna 6. At this time, in order to secure a space for the antenna terminal 7 disposed on the outside, the coiled antenna 6 has a sheet-like base at the center of the short side of the sheet-like substrate 5 on the side where both antenna terminals 7 are disposed. The material 5 is arranged in a spiral shape having a planar shape (concave shape) recessed toward the center side of the material 5. Further, the coiled antenna 6 has a center that is recessed toward the center of the coiled antenna 6 that is wound in a spiral to secure a space for placing an IC chip 11 to be described later. It is arranged in a state.

  The material for the coiled antenna 6 and the antenna terminal 7 is not particularly limited as long as it has electrical conductivity. For example, silver, graphite, silver chloride, copper, nickel, or the like can be used. The coiled antenna 6 and the antenna terminal 7 are disposed by printing conductive ink made of the above material on the surface of the sheet-like substrate 5 in a predetermined spiral pattern. In addition to printing, the coiled antenna 6 and the antenna terminal 7 are disposed by a method such as copper etching foil, dispensing, metal foil pasting, metal direct vapor deposition, metal vapor deposition film transfer, and conductive polymer layer formation. Can do.

  According to the coiled antenna 6, after receiving a radio wave from an external reader / writer and performing necessary processing in the IC chip 11, the processing result can be transmitted to the reader / writer.

  The strap 3 has a belt-like shape, is disposed in a direction intersecting with the coiled antenna 6 (a direction extending between the pair of antenna terminals 7), and is superimposed on the surface of the antenna sheet 2. The strap 3 includes a strip-shaped substrate 10, an IC chip 11, and a pair of enlarged electrodes 12.

  The strip-shaped substrate 10 is a substantially rectangular sheet body. The size of the strip-shaped base material 10 is appropriately set in consideration of the shape and size of the sheet-shaped base material 5 and the coiled antenna 6, but in this embodiment, the length is about 3 mm and the width is about 5 mm. ing. The strip-shaped substrate 10 is preferably provided with a thickness of 50 μm or more and 250 μm or less. If the thickness of the strip-shaped substrate 10 is less than the above range, the protection of the IC chip 11 is insufficient, and if it exceeds the above range, the workability is inferior, such as sufficient pressure is not applied when pressing for adhesion. Inconvenience occurs.

  As the material of the strip-shaped substrate 10, synthetic resin, processed paper, or the like is used, and in particular, engineering plastics such as polysulfone (PSF), polycarbonate, polyarylate having excellent heat resistance and weather resistance are preferably used. The material of the strip-shaped substrate 10 may be colored or colorless, but in the present embodiment, a colorless and transparent material excellent in the visibility of the adhesive layer 4 is used.

  The IC chip 11 is mounted at the center of the mating surface side (back surface side) of the strip-shaped substrate 10. As described above, the IC chip 11 is disposed on the mating surface side of the strip-shaped base material 10, so that the IC chip 11 is covered with the strip-shaped base material 10, and as a result, the IC chip 11 is difficult to come off. Durability against externally applied pressure, heat, bending, etc. is improved.

  The specific structure of the IC chip 11 is appropriately selected according to its application. The size of the IC chip 11 varies depending on the capacity corresponding to the application of the IC tag 1 and the like, but in this embodiment, it has a square size of about 1 mm in length and width as a general size.

  The enlarged electrode 12 is formed in a substantially square planar shape. The pair of enlarged electrodes 12 are electrically connected to the terminals of the IC chip 11 and are laminated on the mating surface side of the strip-shaped substrate 10 (the same surface side as the surface on which the IC chip 11 is disposed). The strip-shaped substrate 10 extends from the chip 11 in the longitudinal direction and in both the left and right directions. The pair of enlarged electrodes 12 are arranged at positions that coincide with the pair of antenna terminals 7 of the antenna sheet 2 (positions that face each other through the adhesive layer 4).

  As a material for the enlarged electrode 12, silver, graphite, silver chloride, copper, nickel, or the like, which is a conductive material, can be used. The enlarged electrode 12 can be formed by printing conductive ink, copper etching, dispensing, attaching metal foil, direct metal deposition, metal deposition film transfer, conductive polymer layer formation, and the like.

  The adhesive layer 4 is filled between the antenna sheet 2 and the strap 3 to be superimposed. The adhesive layer 4 is formed from an insulating adhesive. As this insulating adhesive, for example, a hot melt adhesive, an epoxy adhesive, an acrylic adhesive, an elastic adhesive, a urethane adhesive, or the like can be used. As the reactive type of the insulating adhesive, for example, a reactive insulating adhesive such as a moisture curable type, a thermosetting type, an ultraviolet curable type, an electron beam curable type or the like can be used. In particular, a moisture-curing hot melt adhesive is preferably used.

  The adhesive layer 4 is provided at least over the entire mating surface of the strap 3, and may be provided in a wider range than the strap 3. Thus, by providing the adhesive layer 4 wider than the strap 3, the adhesive layer 4 is surely present between the coiled antenna 6 and the strap 3, so that the electrical connection between the coiled antenna 6 and the strap 3 is achieved. Can be reliably cut off.

  In the antenna terminal region 8 of the antenna sheet 2, a plurality of convex portions 9 protruding to the mating surface side are arranged in a scattered manner. The plurality of convex portions 9 are arranged in a substantially square lattice pattern.

  The shape of the convex portion 9 is preferably a dome shape whose cross-sectional area decreases toward the tip side in the protruding direction, and a substantially conical shape with a hemispherical tip is particularly preferable. Since the convex portion 9 has such a shape, the adhesive layer 4 provided on the convex portion 9 flows out surely and effectively during molding, so that the antenna terminal 7 and the enlarged electrode 12 are provided. Can be connected with higher reliability.

  The dot diameter of the convex portion 9 is preferably 10 μm or more and 200 μm or less, and particularly preferably 30 μm or more and 100 μm or less. Further, the distance between dots of the plurality of convex portions 9 is preferably 0.3 mm or more and 2 mm or less, and particularly preferably 0.6 mm or more and 1.2 mm or less. Note that the shape of the convex portion 9 is not limited to a substantially conical shape, and various convex shapes such as a hook shape, a cross shape, and a comb shape can be provided.

  The convex portion 9 is formed by pressing from the back side of the antenna sheet 2 using a press die having a convex portion having a similar shape. According to the plurality of convex portions 9 formed in this way, the adhesive layer 4 provided on the convex portions 9 flows out, and each antenna terminal 7 is securely connected to each enlarged electrode 12 provided on the strap 3. The strap 3 and the coiled antenna 6 can be reliably connected electrically.

  In the IC tag 1, the plurality of convex portions 9 serve as contact points, and electrical connection between the antenna terminal 7 and the enlarged electrode 12 can be ensured. Further, in the IC tag 1, a gap is generated when the interval between the strap 3 and the antenna sheet 2 is expanded by the plurality of convex portions 9, and the strap 3 is supported in this state. The adhesive layer 4 flows into the generated gap, and the distance between the coiled antenna 6 and the strap 3 of the antenna sheet 2 is held via the adhesive layer 4. As a result, the coiled antenna 6 and the strap 3 are held. It is possible to reliably perform electrical disconnection from the enlarged electrode 12 included in the. That is, a short circuit in the IC tag 1 can be reliably prevented.

  Next, a method for manufacturing the IC tag 1 will be described with reference to FIG. In this manufacturing method, an adhesive is applied by providing an adhesive layer 4 made of an insulating adhesive having electrical insulation on the surface including a pair of antenna terminals 7 in a sheet-like substrate 5 on which a coiled antenna 6 is disposed. The strap 3 is arranged on the surface of the adhesive layer 4 so that the process (FIGS. 2A and 2B) and the pair of antenna terminals 7 and the pair of enlarged electrodes 12 face each other through the adhesive layer 4. Strap placement step (FIGS. 2 (c) and (d)) to be performed, and pressure pressing step (FIGS. 2 (e) and 2 (e) and FIG. 2 (e) and FIG. f)). FIG. 2 (f) is an enlarged view of the two-dot chain line portion of FIG. 2 (e). This will be described in detail below.

  In the adhesive application step (see FIGS. 2A and 2B), an insulating adhesive having electrical insulation is applied to the adhesive placement region 13 including the space between the pair of antenna terminals 7 on the surface of the antenna sheet 2. To do.

  The adhesive placement region 13 is provided in a substantially rectangular shape in a larger area than the strap 3 so as to contain the strap 3 placed on the surface of the adhesive layer 4 made of the applied adhesive. In the present embodiment, the area of the adhesive placement region 13 is a range expanded by about 1 mm in length and width with respect to the area of the strap 3. As the insulating adhesive, as described above, a thermoplastic and moisture-curing hot melt adhesive is preferably used.

  Next, in the strap placement step (see FIGS. 2C and 2D), the strap 3 is placed on the surface of the adhesive layer 4.

  The strap 3 is arranged in such a direction that the surface on which the IC chip 11 and the enlarged electrode 12 are provided becomes the back surface (the surface in contact with the adhesive layer 4). In addition, the adhesive layer is formed so that the antenna terminals 7 provided at both ends of the coiled antenna 6 provided on the surface of the sheet-like substrate 5 face each enlarged electrode 12 provided on the strap 3. The strap 3 is arranged on the surface of 4. Since the adhesive placement region 13 (see FIG. 2A) is provided in a wider area than the strap 3, the strap 3 is in contact with the adhesive layer 4 over the entire surface.

  Next, a pressure pressing step (see FIGS. 2E and 2F) is performed in which the antenna sheet 2 and the strap 3 are pressed and bonded together and the convex portion 9 is formed.

  Among the pair of press dies used in this step, a plurality of convex forming portions 15 formed in a dot shape are provided on the first press die surface 14 in contact with the antenna sheet 2 at positions facing each antenna terminal region 8. Have. By the convex forming portion 15, a plurality of convex portions 9 can be provided in the antenna terminal region 8.

  The size of the convex forming portion 15 is appropriately set according to the size of the convex portion 9 formed in the antenna terminal region 8. In this embodiment, a convex forming portion having a height of 300 μm, a diameter of 100 μm, and a pitch distance of 1 mm is formed in the antenna terminal region 8 so that a convex portion 9 having a height and diameter of 50 μm and a pitch distance of 1 mm can be formed. A plurality of 15 are provided on the first press die surface 14.

  Further, as the shape of the convex forming portion 15 provided on the first press die surface 14, convex portions having various shapes such as a saddle shape, a tense shape, and a comb shape are formed instead of the dot shape of this example. Can do.

  In addition, the convex formation part 15 is good to form so that a cross-sectional area may reduce toward the front end side of a protrusion direction (in the shape of a dome). Since the convex forming portion 15 has such a shape, the convex portion 9 provided in the antenna terminal region 8 can also be formed into a shape whose cross-sectional area decreases toward the tip side.

  The second press die surface 16 on the strap 3 side is set to vibrate by ultrasonic vibration as will be described later, and is formed in a substantially flat shape.

  The pair of press dies are equipped with a heater for heating the pressure surface in order to facilitate the projecting deformation of the antenna sheet 2 and to improve the fluidity of the insulating adhesive of the adhesive layer 4. You can also

  The antenna sheet 2 in which the strap 3 is disposed on the surface of the adhesive layer 4 is sandwiched between the first press die surface 14 and the second press die surface 16 thus configured, and a pair of press dies is formed. The antenna sheet 2 and the strap 3 are pressurized by applying a constant pressure.

  According to the pressure pressing process described above, a part of each antenna terminal 7 in the antenna sheet 2 can be protruded and deformed by the convex forming portion 15 of the first press die surface 14. That is, the dot-shaped convex part 9 which protruded to the mating surface side can be formed in the antenna sheet 2 and each antenna terminal 7 corresponding to the convex forming part 15 provided on the first press die surface 14. Accordingly, the coiled antenna 6 and the strap 3 are in direct contact with the top of the dot-shaped convex portion 9 as a contact point, and the strap 3 is pushed up by the convex portion 9 in the peripheral portion of the convex portion 9. As a result, a gap S is formed between the coiled antenna 6 and the strap 3.

  In this way, by forming the plurality of convex portions 9 projecting to the mating surface side in the antenna terminal region 8, insulating adhesion between the convex portions 9 provided on the antenna terminal 7 and the enlarged electrode 12 is achieved. The agent flows out, the convex portion 9 comes into contact with the enlarged electrode 12, and electrical connection between the antenna terminal 7 and the enlarged electrode 12 can be realized with high reliability.

  Furthermore, as shown in FIG. 2 (f), the convex portion 9 is formed, so that the space between the coiled antenna 6 and the strap 3 is expanded and a gap S is formed. When the insulating adhesive flows into the gap S, the adhesive layer 4 can be thickened, and the contact between the coiled antenna 6 and the enlarged electrode 12 can be reliably prevented, and the IC chip 11 is short-circuited. Can be prevented.

  Further, the entire surface of the strap 3 faces the antenna sheet 2 through the adhesive layer 4. Therefore, the strap 3 is firmly bonded to the antenna sheet 2 over the entire surface. In particular, as described above, the adhesive placement region 13 in the adhesive application step includes the entire surface of the strap 3 and is formed wider than the strap 3, so that the strap 3 and the antenna sheet 2 are brought into contact with each other to be pressed. Then, the surplus insulating adhesive wraps around and adheres to the outer peripheral side surface of the strap 3. Therefore, not only the surface of the strap 3 but also the outer peripheral side surface of the strap 3 becomes the adhesive layer 4, and the strap 3 is bonded to the antenna sheet 2 very firmly.

  Further, since a hot-melt adhesive is used as the insulating adhesive, when the pressure is applied by the first press die surface 14 and the second press die surface 16, the projection in the antenna terminal region 8 is caused by the heat generated by the pressurization. The fluidity of the adhesive layer 4 between the shape portion 9 and the enlarged electrode 12 can be enhanced. For this reason, the insulating adhesive between the convex portion 9 and the enlarged electrode 12 in the antenna terminal region 8 can flow out with high reliability, and electrical contact between them can be realized with high reliability. Moreover, the same effect can be acquired also by equip | pressing a heating heater on a press type | mold pressurization surface.

  Furthermore, when a moisture-curing type adhesive is used as the insulating adhesive, the bonding state of the strap 3 can be enhanced during storage of the created IC tag 1 after performing the pressure pressing step. .

  Next, a strap joining device 21 for joining the strap 3 to the antenna sheet 2 will be described with reference to FIGS. 3 and 4. The procedure for joining the strap 3 to the antenna sheet 2 is as shown in FIG. The strap joining device 21 mainly includes a first roll 22, a second roll 23, a third roll 24, a fourth roll 25, an adhesive application device 26, a strap transport conveyor 27, a press anvil 28, and a joining head 29. .

  The first roll 22 is for holding the antenna sheet 2 continuous in a belt shape in a wound state and for carrying out the antenna sheet 2 continuous in a belt shape by rotating. The second roll 23 supports the antenna sheet 2 that has been carried out in the form of a strip so as to apply an adhesive on the surface thereof, and sends it out by rotation. The third roll 24 supports the antenna sheet 2 in order to place the strap 3 on the surface of the antenna sheet 2 that is continuous in the shape of a belt coated with an adhesive, and rotates the sheet-like substrate 5 on which the strap 3 is arranged. It will be sent out. The fourth roll 25 winds up the IC tag 1 that is continuous in a band shape to which the strap 3 is bonded by pressure.

  The press anvil 28 serves as a fixing base for holding the antenna sheet 2 that is continuous in a band shape in which the strap 3 is disposed in a state in which the antenna terminal 7 and the enlarged electrode 12 face each other and crimping the antenna sheet 2.

  The press anvil 28 has a substantially cylindrical roller shape, and is configured to be rotatable about its axis. The press anvil 28 is configured to hold the antenna sheet 2 that is continuous in a band shape in which the strap 3 is disposed on the outer surface.

  On the outer peripheral surface of the press anvil 28, a plurality of convex forming portions 30 are disposed at positions facing the respective antenna terminals 7 when the antenna sheet 2 is held. The convex forming portion 30 is disposed over the entire outer periphery of the press anvil 28. A plurality of convex portions 9 can be formed on the antenna terminal 7 of the coiled antenna 6 disposed on the antenna sheet 2 by the convex forming portion 30.

  The bonding head 29 has a pressure surface 31 that vibrates by ultrasonic vibration at the tip. The joining head 29 is fixedly arranged in the normal direction with respect to the press anvil 28, and the pressing surface 31 has a predetermined interval with respect to the outermost peripheral surface formed by the protruding surface of each convex forming portion 30 of the press anvil 28. Is provided at a position facing each other. The distance between the pressing surface 31 and the press anvil 28 is appropriately adjusted depending on the thickness of the IC tag to be designed. At this interval, the IC tag is clamped and becomes the final thickness of the IC tag.

  The antenna sheet 2 in which the strap 3 is disposed between the outer peripheral surface of the press anvil 28 and the pressurizing surface 31 of the bonding head 29 by rotating the press anvil 28 because the bonding head 29 is fixedly disposed at this position. Is sandwiched and both can be bonded by pressing.

  Since the entire surface of the strap 3 is pressurized with equal pressure by the pressure surface 31 of the bonding head 29, the strap can be bonded with high certainty, and the plurality of convex portions 9 can be formed in a uniform shape. .

  Further, the pressure surface 31 of the bonding head 29 may be subjected to a diamond coating process which is a surface treatment in order to suppress friction with the strap 3. Instead of this, it is also effective to subject the pressure surface 31 to a surface treatment such as a Teflon (registered trademark) coat or to dispose a carbide chip made of tungsten carbide on the surface of the pressure surface 31. Alternatively, a rotation roller may be provided at the tip of the joining head 29, and the outer peripheral surface of the rotation roller may be a pressure surface.

  Next, a procedure for creating the IC tag 1 using the strap joining device 21 will be described.

  On the first roll 22, the antenna sheet 2 continuous in a strip shape is wound. By rotating the first roll 22 and other rolls, the antenna sheet 2 continuous in a belt shape is conveyed. A coiled antenna 6 is disposed at a predetermined position for each antenna sheet 2 on the surface of the antenna sheet 2 that is continuous in a band shape. The antenna pattern (coiled antenna 6 and antenna terminal 7) of the antenna sheet 2 may be provided by printing on a sheet-like substrate with a printing machine provided in the middle of web conveyance.

  The antenna sheet 2 continuous in a belt shape conveyed from the first roll 22 is delivered to the second roll 23, and the adhesive application device 26 provided at a position facing the second roll 23 is used to install an adhesive. An insulating adhesive is applied to 13.

  When the antenna sheet 2 continuous in a strip shape coated with an insulating adhesive is conveyed between the positions of the third roll 24, the strap 3 conveyed from the strap conveyor 27 is arranged at a predetermined position. At this time, the antenna terminal 7 and the enlarged electrode 12 are arranged so as to face each other through the adhesive layer 4.

  The antenna sheet 2 on which the strap 3 is disposed is pinched by the press anvil 28 and the joining head 29. That is, the strap 3 is disposed between the fixedly disposed joining head 29 by rotating the press anvil 28 having the belt-shaped continuous antenna sheet 2 on which the strap 3 is disposed on the surface thereof. The antenna sheet 2 that is continuous in the shape of the belt is sandwiched. At this time, since the pressing surface 31 at the tip of the press anvil 28 and the joining head 29 has a predetermined interval, the antenna sheet 2 on which the strap 3 is arranged to this thickness is compressed and bonded. .

  Furthermore, according to the strap joining device 21 including the press anvil 28 having the convex forming portion 30 and the joining head 29, by projecting and deforming a part of each antenna terminal 7 of the coiled antenna 6 on the antenna sheet 2. The convex part 9 can be formed. The adhesive provided on the surface of the convex portion 9 flows out from the top surface of the convex portion 9, and the antenna terminal 7 and the enlarged electrode 12 of the strap 3 are in direct contact via the convex portion 9. Further, since the convex portion 9 is formed, the gap (S in FIG. 2F) between the coiled antenna 6 around the convex portion 9 and the IC chip 11 and the enlarged electrode 12 is held in a widened state. In the meantime, the adhesive layer 4 is thickened by the inflow of the adhesive, and the short circuit that may occur due to the enlarged electrode 12 coming into contact with the coiled antenna 6 can be reliably prevented.

  Since the pressing surface 31 of the joining head 29 has a curved concave curved surface corresponding to the outer peripheral surface of the press anvil 28, the entire surface of the strap 3 can be pressed simultaneously. Therefore, according to the apparatus, the straps 3 can be joined with high reliability, and the plurality of convex portions 9 can be evenly formed.

  As described above, the IC tag continuous in a strip shape in which the strap is joined by the press anvil 28 and the joining head 29 and the convex portion 9 is formed on the antenna terminal 7 is wound around the fourth roll 25. Thereafter, the continuous IC tags are completed as individual IC tags by cutting.

  The IC tag 41 of FIG. 5 includes an antenna sheet 2, a strap 43 superimposed on the surface of the antenna sheet 2, and an adhesive layer 4 filled between the antenna sheet 2 and the strap 43. The IC tag 41 has a plurality of convex portions 42 formed in the enlarged electrode region 46 of the strap 43. The enlarged electrode region 46 is the enlarged electrode 44 and its peripheral part. The other configuration is the same as that of the IC tag 1 in FIG.

  The IC tag 41 is formed by pressing a plurality of convex portions from the surface side of the strap 43 to the enlarged electrode region 46 after disposing the strap 43 on the surface of the adhesive layer 4 as in the manufacture of the IC tag 1. The Due to the pressing of the convex portion, the strip-shaped base material 45 and the enlarged electrode 44 project and deform from the surface side of the strap 43 toward the mating surface, and the convex portion 42 is formed on the enlarged electrode 44. In the case of manufacturing using a strap bonding apparatus, the IC tag 41 can be manufactured by providing a convex forming portion on the pressure surface side of the bonding head.

  The IC tag 41 is also supported in a state where the gap between the coiled antenna 6 and the enlarged electrode 44 is widened by the formation of the plurality of convex portions 42, and the adhesive layer 4 surely flows in between. Direct contact between the coiled antenna 6 and the enlarged electrode 44 can be prevented. That is, the IC tag 41 can also reliably prevent a short circuit between the enlarged electrode 44 and the coiled antenna 6.

  The IC tag 51 of FIG. 6 includes an antenna sheet 2, a strap 52 superimposed on the surface of the antenna sheet 2, and an adhesive layer 4 filled between the antenna sheet 2 and the strap 52. The IC tag 51 is not disposed on the mating surface side of the strap 52 but on the surface side of the strap 52 (opposite side to the mating surface, that is, outside). Other configurations are the same as those of the IC tag 1 of FIG. 1 described above.

  The enlarged electrode 53 is connected to the IC chip 11 on the surface side of the strip-shaped substrate 10, penetrates the strap 52, and is disposed in a planar shape on the mating surface side.

  Also in the IC tag 51, the electrical connection between the enlarged electrode 53 and the antenna terminal 7 is ensured by the convex portion 9. Furthermore, according to the IC tag 51, since the IC chip 11 is disposed on the surface side of the strap 52, the IC chip 11 can be reliably prevented from coming into contact with the antenna sheet.

  The IC tag of the present invention is not limited to the above embodiment. For example, the convex portion formed in the antenna terminal region of the antenna sheet or the enlarged electrode region of the strap is not limited to a scattered point, and may be linear, cross-shaped, V-shaped, etc. The electrical connectivity and electrical stability can be improved.

  Moreover, it can also be set as the shape which provided the convex part from the sheet | seat base material side and the expansion electrode side both surfaces of a strap. By providing the convex portions from both sides in this way, the electrical connection through the connection terminal can be ensured, and the gap between the enlarged electrode and the antenna can be widened and supported. Short circuit with the antenna can be prevented.

  As described above, the IC tag of the present invention has a structure having physically and electrically reliable connectivity, and can be used in fields such as transportation and distribution, warehouse, factory process management, and handling of luggage. Can do.

(A) And (b) is a typical top view which shows the IC tag which concerns on one Embodiment of this invention, and an AA arrow partial sectional view (A)-(f) is typical fragmentary sectional drawing which shows the manufacturing process of IC tag of FIG. Schematic diagram showing the IC tag manufacturing apparatus of FIG. Partial enlarged view showing the periphery of the press anvil of the manufacturing apparatus of FIG. The typical fragmentary sectional view which shows the IC tag which concerns on embodiment different from the IC tag of FIG. Schematic partial sectional view showing an IC tag according to an embodiment different from the IC tag of FIGS. 1 and 5

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 IC tag 2 Antenna sheet 3 Strap 4 Adhesive layer 5 Sheet-like base material 6 Coiled antenna 7 Antenna terminal 8 Antenna terminal area 9 Convex part 10 Strip-like base material 11 IC chip 12 Enlarged electrode 13 Adhesive arrangement area 14 First press die surface 15 Convex forming part 16 Second press die surface 21 Strap joining device 22 First roll 23 Second roll 24 Third roll 25 Fourth roll 26 Adhesive application device 27 Strap conveyor 28 Press anvil 29 Joining head DESCRIPTION OF SYMBOLS 30 Convex formation part 31 Pressure surface 41 IC tag 42 Convex part 43 Strap 44 Enlarged electrode 45 Strip-shaped base material 46 Enlarged electrode area | region 51 IC tag 52 Strap 53 Expanded electrode S Gap

Claims (4)

An antenna sheet in which a coiled antenna and a pair of planar antenna terminals at both ends thereof are laminated on the mating surface side of the sheet-like base material;
A strap on which an IC chip is mounted, a pair of planar enlarged electrodes extending from the left and right sides of the IC chip are stacked on the mating surface side of the strip-shaped substrate, and superimposed on the antenna sheet;
An IC tag comprising an antenna sheet and an adhesive layer filled between the strap and
The coiled antenna is disposed in a spiral shape having a concave planar shape in which the side on which the pair of antenna terminals is disposed is recessed toward the center side of the sheet-like base material, and the strap is the spiral shape. the crosses the coil antenna, and has a pair of enlarged electrodes and the pair of antenna terminals are arranged to coincide,
The antenna terminal region or larger electrode area of the strap of the antenna sheet, projecting mating surface side, the tip is formed convex portion of the substantially conical hemispherical,
With this convex portion, the pair of antenna terminals and the pair of enlarged electrodes are in direct contact,
The adhesive layer may have a thickness the larger between the coil antenna and the strap than between the antenna terminal and the strap in the peripheral portion of the convex portion,
An IC tag, wherein the plurality of convex portions are formed in a substantially square lattice pattern in a scattered manner .   The IC tag according to claim 1, wherein the IC chip is disposed on a mating surface side of the strip-shaped substrate, and an adhesive layer is provided between the IC chip and the antenna sheet.   The IC tag according to claim 1 or 2, wherein the convex portion is formed by pressing from the back side of the antenna sheet. The IC tag according to claim 1, wherein the adhesive layer is provided in a wider range than the strap.

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