JP5006916B2 - RFID tag - Google Patents

Description

  The present invention relates to an RFID (Radio_Frequency_IDentification) tag that exchanges information with an external device in a non-contact manner. In addition, among those skilled in the art, the “RFID tag” used in the present specification is referred to as an “RFID tag inlay” as an internal structure member (inlay) for the “RFID tag”. In some cases. Alternatively, the “RFID tag” may be referred to as a “wireless IC tag”.

  2. Description of the Related Art In recent years, various RFID tags have been proposed for exchanging information with an external device typified by a reader / writer by radio waves (see, for example, Patent Document 1, Patent Document 2, and Patent Document 3). As a kind of RFID tag, a structure in which an antenna pattern for radio wave communication and a circuit chip are mounted on a base sheet made of plastic or paper has been proposed. It is considered to be used in such a way as to identify an article by exchanging information about the article with an external device.

  FIG. 8 is a diagram illustrating an example of an RFID tag.

  8 shows a top view of an RFID tag 800 which is an example of an RFID tag, and part (b) shows a cutting line H− in part (a) of the RFID tag 800. A cross-sectional view along H is shown.

  The RFID tag 800 shown in FIG. 8 includes a long base 801 formed of a PET film, a communication antenna 802 wired along the longitudinal direction on the base 801, and the antenna 802 electrically A circuit chip 803 that is connected and performs wireless communication via the antenna 802 and an adhesive 804 that adheres and fixes the circuit chip 801 to the base 801 are configured.

  The circuit chip 803 constituting the RFID tag 800 can perform wireless communication with an external device via the antenna 802.

  For such an RFID tag, a wide range of usage forms including the above-described usage forms are considered. For example, in the case of a usage form that is attached to an easily deformable article such as clothes, the base 801 is bent. Since the circuit chip 803 is difficult to bend easily, bending stress is applied to the circuit chip 803, and the circuit chip 803 is broken and the circuit chip 803 is peeled off. Therefore, conventionally, the following method has been proposed as an example of a method for reducing the bending stress applied to the circuit chip 803.

  FIG. 9 is a diagram illustrating an example of a conventional technique for reducing bending stress applied to the circuit chip 803.

  9 is a top view of the RFID tag 900, and FIG. 9B is a sectional view of the RFID tag 900 taken along the line JJ in FIG. Is shown with the RFID tag 900 bent.

  In FIG. 9, the same components as those shown in FIG. 8 described above are denoted by the same reference numerals as those in FIG. 8, and the description of these components will be omitted below.

  The RFID tag 900 shown in FIG. 9 is provided with a reinforcing body 901 made of fiber reinforced resin that covers the upper side of the circuit chip 803. The reinforcing body 901 is bonded and fixed to the base 801 with a thermosetting adhesive 902 that fills the circuit chip 803.

  In this RFID tag 900, as shown in part (b) of FIG. 9, the reinforcing member 901 formed of a hard material called fiber reinforced resin prevents deformation of the RFID tag 900 from reaching the vicinity of the circuit chip 803. As a result, the bending stress applied to the circuit chip 803 is reduced.

JP 2000-310226 A JP 2000-200332 A JP 2001-351082 A

  However, in the RFID tag 900 shown in FIG. 9, bending stress is concentrated at the point where the edge of the adhesive 902 that is bonded and fixed to the base 801 from the reinforcing body 901 and the antenna 802 intersect. There is a problem that the antenna 802 may be disconnected.

  In view of the above circumstances, an object of the present invention is to provide an RFID tag in which bending stress to a circuit chip is reduced and antenna disconnection is avoided.

The RFID tag of the present invention that achieves the above object is
A base that can be bent back and
A communication antenna wired on the base;
A circuit chip that is electrically connected to the antenna and performs wireless communication via the antenna;
A chip reinforcing body that covers at least the periphery of the circuit chip and a part of the wiring of the antenna at least upward when the base is down, and a first edge that bends with the base inscribed; And a chip reinforcing body having a second edge portion which is located on the inner side of the bending of the base than the first edge portion and intersects the wiring of the antenna.

  According to the RFID tag of the present invention, the deformation of the base is prevented from being applied to the circuit chip by the chip reinforcing body, thereby reducing the bending stress applied to the circuit chip. Further, according to the RFID tag of the present invention, when the base is bent, the portion around the antenna in the base is bent gently without contacting the first edge when the base is bent. The bending radius is larger than that of the portion in contact with the first edge, and the bending stress to the antenna is dispersed. Thereby, the bending stress concerning the said antenna is reduced and a disconnection is avoided. That is, according to the RFID tag of the present invention, the bending stress to the circuit chip is reduced and the disconnection of the antenna is avoided.

Here, the RFID tag of the present invention is “the chip reinforcing body has an uneven edge, the uneven protrusion is the first edge, and the uneven recess is the second edge. The form `` become part '' is a preferred form, or
"The base is long in a predetermined direction,
The antenna extends along the predetermined direction;
The above-mentioned chip reinforcing body is also a preferable form in which the second edge portion is formed by crossing the wiring of the antenna obliquely with respect to the predetermined direction.

  According to these embodiments, it is possible to easily realize bending of the portion around the antenna in the base with a bending radius larger than that of other portions. Further, according to the latter form, since the second edge portion obliquely crosses the wiring of the antenna, the thickness of the portion of the antenna that intersects with the second edge portion is substantially increased. As a result, the antenna itself becomes strong against bending stress at a portion intersecting with the second edge.

"The antenna has two types of antenna parts having different wiring thicknesses,
The chip reinforcement body intersects the wiring of the antenna portion having a relatively thick wiring among the two types of antenna portions at the first edge portion, and the two types of antenna portions at the second edge portion. Among them, a configuration in which the thickness of the wiring intersects with the wiring of the relatively thin antenna portion is also a preferable mode.

  According to the RFID tag of this preferred form, the strength against bending stress is enhanced by relatively increasing the thickness of the antenna portion that intersects with the first edge and is concerned about the concentration of bending stress. As a result, even if there are a plurality of antenna parts and some of them have to cross the first edge part due to restrictions on wiring, for example, all the antenna parts Disconnection will be avoided.

  As described above, according to the present invention, an RFID tag can be obtained in which bending stress to the circuit chip is reduced and antenna disconnection is avoided.

It is a figure which shows 1st Embodiment of the RFID tag of this invention. It is a figure which shows 2nd Embodiment of the RFID tag of this invention. It is a figure which shows 3rd Embodiment of the RFID tag of this invention. It is a top view which shows 4th Embodiment of the RFID tag of this invention. It is a top view which shows 5th Embodiment of the RFID tag of this invention. It is a top view which shows 6th Embodiment of the RFID tag of this invention. It is a top view which shows 7th Embodiment of the RFID tag of this invention. It is a figure which shows an example of an RFID tag. It is a figure which shows an example of the conventional method for reducing the bending stress concerning the circuit chip 803.

  Embodiments of the present invention will be described below with reference to the drawings.

  First, a first embodiment of the RFID tag according to the present invention will be described.

  FIG. 1 is a diagram showing a first embodiment of an RFID tag according to the present invention.

  A top view of the RFID tag 100 which is the first embodiment of the RFID tag of the present invention is shown in part (a) of FIG. 1, and part (a) of the RFID tag 100 is shown in part (b). ) Is a cross-sectional view taken along the cutting line AA in a state where the RFID tag 100 is bent.

  The RFID tag 100 shown in FIG. 1 includes a long base 101 formed of a PET film, a communication antenna 102 wired along the longitudinal direction on the base 101, and the antenna 102 electrically A circuit chip 103 that is connected and performs wireless communication via the antenna 102, an adhesive 104 that adheres and fixes the circuit chip 103 to the base 101, and a fiber reinforced resin reinforcing body that covers the circuit chip 103. 105 and a thermosetting adhesive 106 in which the reinforcing body 105 is bonded and fixed to the base 101. Here, the adhesive 106 is in a state of being piled on the base 101 so as to fill the circuit chip 103, and has a hardness similar to that of the reinforcing body 105 after being cured. The base 101, the antenna 102, and the circuit chip 103 correspond to examples of the base, the antenna, and the circuit chip according to the present invention, respectively. The combination of the reinforcing body 105 and the adhesive 106 that fixes the reinforcing body 105 to the base 101 corresponds to an example of the chip reinforcing body according to the present invention.

  In the RFID tag 100, the reinforcing body 105 formed of a hard material such as fiber reinforced resin prevents the deformation of the RFID tag 100 from being applied to the circuit chip 103, whereby the bending stress applied to the circuit chip 103 is prevented. Reduced.

  Further, the reinforcing body 105 in the RFID tag 100 is a plate having a concavo-convex edge, and is arranged so that the edge of the concavo-convex concave portion intersects the antenna 102. As a result, the edge of the adhesive 106 that adheres and fixes the reinforcing body 105 to the base has a concavo-convex shape along the edge of the reinforcing body 105. 2 corresponds to an example of the edge of 2) across the antenna 102.

  Here, the RFID tag 100 is bent according to the deformation of the article to which the RFID tag 100 is attached because the base 101 is made of a PET film and has flexibility to be bent back. And this RFID tag 100 is along the bending line L inscribed in the convex part (equivalent to an example of the 1st edge part said to this invention) of the adhesive agent 106 which adhere | attached and fixed the reinforcement body 105 to the base. Often turns. At this time, the base portion 101 a around the antenna 102 bends loosely without contacting the edge of the adhesive 106. Therefore, the bending radius of the base portion 102a around the antenna 102 is larger than the bending radius of the other base portion 101b that bends inscribed in the convex portion of the edge of the adhesive 106, and the bending stress applied to the antenna 102 is dispersed. It becomes. As a result, the bending stress applied to the antenna 102 is reduced and disconnection is avoided. That is, in the RFID tag 100 of this embodiment, the bending stress on the circuit chip 103 is reduced and the disconnection of the antenna 102 is avoided.

  Next, a second embodiment of the RFID tag according to the present invention will be described.

  FIG. 2 is a diagram showing a second embodiment of the RFID tag according to the present invention.

  2 shows a top view of an RFID tag 200 which is a second embodiment of the RFID tag of the present invention. Part (b) shows a part (a) of the RFID tag 200. ) Is shown in a state where the RFID tag 200 is bent.

  In FIG. 2, the same components as those of the first embodiment shown in FIG. 1 described above are denoted by the same reference numerals as those of FIG. Omitted.

  In the RFID tag 200 of the present embodiment, the shape of the reinforcing body 202 is different from that of the first embodiment. Further, in the RFID tag 200 of this embodiment, the position of the antenna 201 on the base 101 is different from that of the first embodiment according to the shape of the reinforcing body 202. A combination of the reinforcing body 202 shown in FIG. 2 and the adhesive 106 that adheres and fixes the reinforcing body 202 to the base 101 corresponds to an example of the chip reinforcing body according to the present invention.

  The reinforcing body 202 of the RFID tag 200 is also a fiber reinforced resin plate as in the first embodiment, and prevents the deformation of the RFID tag 100 from reaching the circuit chip 103. Bending stress is reduced.

  Here, as shown in Part (a) of FIG. 2, the reinforcing body 202 of the present embodiment has a shape in which the top surface is rounded at four corners, and the round corners at the edges of the reinforcing body 202. Are arranged so as to cross the wiring of the antenna 201 diagonally. As a result, of the edges of the adhesive 106 that adheres and fixes the reinforcing body 202 to the base, a rounded corner portion along the edge of the reinforcing body 202 (corresponding to an example of the second edge according to the present invention). Crosses the antenna 201 diagonally.

  The RFID tag 200 in FIG. 2 has a bend line L that is inscribed in a portion of the edge of the adhesive 106 that protrudes most in the longitudinal direction of the RFID tag 200 (corresponding to an example of the first edge in the present invention). It often turns at. At this time, in this embodiment, the base portion 101 c around the antenna 201 bends gently without contacting the edge of the adhesive 106. Therefore, the bending radius of the base portion 101c around the antenna 201 is larger than the bending radius of the other base portion 101d that bends inscribed in the portion that protrudes most in the longitudinal direction, and the bending stress applied to the antenna 201 is dispersed. Become. Thereby, the bending stress applied to the antenna 201 is reduced and disconnection is avoided. Furthermore, in the present embodiment, since the edge of the adhesive 106 crosses the antenna 201 obliquely, the thickness of the portion of the antenna 201 that intersects with the edge is substantially increased. As a result, the antenna 201 itself becomes strong against bending stress at a portion intersecting with the edge. As described above, also in the RFID tag 200 of the present embodiment, the bending stress to the circuit chip is reduced and the disconnection of the antenna is avoided as in the first embodiment.

  Next, a third embodiment of the RFID tag according to the present invention will be described.

  FIG. 3 is a diagram showing a third embodiment of the RFID tag according to the present invention.

  3 shows a top view of an RFID tag 300 which is a third embodiment of the RFID tag according to the present invention. Part (b) shows a part (a) of the RFID tag 300. ) Is a sectional view taken along the line C-C in a state where the RFID tag 300 is bent.

  In FIG. 3, the same components as those of the second embodiment shown in FIG. 2 described above are denoted by the same reference numerals as those in FIG. 2. In the following description, these components are not described repeatedly. Omitted.

  In the RFID tag 300 of this embodiment, the shape of the reinforcing body 301 is different from the shape of the reinforcing body 202 in the second embodiment. Further, the RFID tag 300 is provided with a reinforcing body (back side reinforcing body 302) for reducing bending stress to the circuit chip 103 on the back surface side of the base 101 opposite to the circuit chip 103 side. It is different from the form. A combination of the reinforcing body 301 shown in FIG. 3 and the adhesive 106 that adheres and fixes the reinforcing body 301 to the base 101 corresponds to an example of the chip reinforcing body according to the present invention.

  The reinforcing member 301 of the RFID tag 300 has a shape in which the reinforcing member 202 in the second embodiment shown in FIG. 2 is provided with a hole for accommodating the circuit chip 103 as shown in FIG. The reinforcing body 301 is fixed to the base 101 with a thermosetting adhesive 106 so that the circuit chip 103 is accommodated in the hole. Further, the hole in which the circuit chip 103 is accommodated is filled with an adhesive 106. In the present embodiment, the circuit chip 103 is accommodated in the hole of the reinforcing body 301 so that the upper side of the circuit chip 103 is opened, and the thickness is reduced by the opened amount. Further, in the present embodiment, the back side reinforcing body 302 having the same shape as the reinforcing body 301 except that no hole is provided is provided on the back side of the base 101 opposite to the front side where the circuit chip 103 is located. A thermosetting adhesive 106 is fixed to 301 at a position sandwiching the base 101. This back side reinforcing body 302 is also made of fiber reinforced resin like the reinforcing body 301, and in this embodiment, the reduction of bending stress applied to the circuit chip 103 is reinforced.

  In the reinforcing body 301 in the present embodiment, the bending radius of the base portion 101c around the antenna 201 is the other base portion 101d that bends inscribed in the portion that protrudes most in the longitudinal direction, as in the second embodiment. The bending stress on the antenna 201 is dispersed. Further, since the edge of the adhesive 106 crosses the antenna 201 obliquely, the thickness of the portion of the antenna 201 that intersects with the edge is substantially increased. As a result, the antenna 201 itself becomes strong against bending stress at a portion intersecting with the edge. As described above, also in the RFID tag 300 of this embodiment, the bending stress to the circuit chip is reduced and the disconnection of the antenna is avoided as in the first and second embodiments.

  Subsequently, four embodiments from the fourth to the seventh embodiment of the RFID tag according to the present invention will be described in order. In the following, three embodiments from the first to the third embodiment will be described with respect to cross-sectional views. Since this is almost the same as the cross-sectional view referred to in the description, the illustration is omitted and only the top view will be described.

  First, a fourth embodiment of the RFID tag according to the present invention will be described.

  FIG. 4 is a top view showing a fourth embodiment of the RFID tag according to the present invention.

  In FIG. 4, the same components as those in the second embodiment shown in FIG. 2 described above are denoted by the same reference numerals as those in FIG. 2. In the following description, these components are not described repeatedly. Omitted.

  In the RFID tag 400 shown in FIG. 4, the shape of the reinforcing body 401 that plays a role of reducing the bending stress to the circuit chip is different from the shape of the reinforcing body 202 in the second embodiment. A combination of the reinforcing member 401 of the RFID tag 400 and the adhesive 106 that adheres and fixes the reinforcing member 401 to the base 101 corresponds to an example of the chip reinforcing member according to the present invention.

  The reinforcing body 401 in the present embodiment has a shape in which the corners of the top surface are chamfered linearly, and the chamfered portion at the edge of the reinforcing body 401 is disposed so as to cross the wiring of the antenna 201 obliquely. . As a result, the edge of the adhesive 106 also has a portion along the chamfered portion of the edge of the reinforcing body 401 (corresponding to an example of the second edge portion according to the present invention) obliquely crossing the wiring of the antenna 201. Become. Thereby, when the RFID tag 400 bends at a bend line L that is inscribed in a portion of the edge of the adhesive 106 that protrudes most in the longitudinal direction (corresponding to an example of the first edge portion according to the present invention), The base portion 101e around the antenna 201 is not in contact with the edge of the adhesive 106, but has a larger bending radius and bending stress than the other base portion 101f that bends inscribed in the portion that protrudes most in the longitudinal direction. Turn in a distributed state. Further, since the edge of the adhesive 106 crosses the antenna 201 obliquely, the antenna 201 itself becomes strong against bending stress at a portion intersecting with the edge. As described above, also in the RFID tag 400 of the present embodiment, the bending stress to the circuit chip is reduced and the disconnection of the antenna is avoided as in the first to third embodiments.

  Next, a fifth embodiment of the RFID tag according to the present invention will be described.

  FIG. 5 is a top view showing a fifth embodiment of the RFID tag according to the present invention.

  In FIG. 5, the same components as those of the first embodiment shown in FIG. 1 described above are denoted by the same reference numerals as those in FIG. 1. Omitted.

  The RFID tag 500 shown in FIG. 5 has an antenna 501 having antenna portions 501a parallel to each other on a base 101, and a concavo-convex shape of a reinforcing body 502 that serves to reduce bending stress to a circuit chip. 1 is different from the RFID tag 100 of the first embodiment shown in FIG. A combination of the reinforcing body 502 shown in FIG. 5 and the adhesive 106 that adheres and fixes the reinforcing body 502 to the base 101 also corresponds to an example of the chip reinforcing body according to the present invention. The antenna 501 shown in FIG. 5 corresponds to an example of an antenna according to the present invention.

  In the RFID tag 500, the reinforcing body 502 is disposed such that the edge of the recess among the edges of the reinforcing body 502 intersects the two antenna portions 501a. As a result, of the edges of the adhesive 106 that adheres and fixes the reinforcing body 502 to the base 101, there are 2 recesses (corresponding to an example of the second edge according to the present invention) along the edge of the reinforcing body 502. It crosses over the antenna portion 501a of the book. As a result, when the RFID tag 500 bends along the same bending line L as in the first embodiment, the base portion 101g around the two antenna portions 501a has a convex portion on the edge of the adhesive 106 (according to the present invention). This is equivalent to an example of the first edge portion). The bending radius is larger than the other base portion 101h that bends inwardly, bends in a state where the bending stress is dispersed, the bending stress applied to the antenna 501 is reduced, and disconnection occurs. Avoided. That is, also in the RFID tag 500 of the present embodiment, the bending stress to the circuit chip is reduced and the disconnection of the antenna is avoided as in the first to fourth embodiments.

  Next, a sixth embodiment of the RFID tag according to the present invention will be described.

  FIG. 6 is a top view showing a sixth embodiment of the RFID tag according to the present invention.

  In FIG. 6 as well, the same components as those of the first embodiment shown in FIG. 1 described above are denoted by the same reference numerals as those in FIG. 1, and in the following, these components will not be described repeatedly. Omitted.

  The RFID tag 600 shown in FIG. 6 has a role in which an antenna 601 having two types of antenna portions 601a and 601b having different thicknesses is wired on the base 101, and a role of reducing bending stress to the circuit chip. The RFID tag 100 according to the first embodiment shown in FIG. 1 is different from the RFID tag 100 of the first embodiment shown in FIG. The combination of the reinforcing body 602 shown in FIG. 6 and the adhesive 106 that adheres and fixes the reinforcing body 602 to the base 101 also corresponds to an example of the chip reinforcing body referred to in the present invention. An antenna 601 shown in FIG. 6 corresponds to an example of an antenna according to the present invention.

  In the present embodiment, the reinforcing body 602 is such that the edge of the concave portion of the edges of the reinforcing body 602 intersects with the relatively thin antenna portion 601a, and the edge of the convex portion intersects with the relatively thick antenna portion 601b. Placed in. As a result, at the edge of the adhesive 106 that adheres and fixes the reinforcing body 602 to the base 101, along the edge of the reinforcing body 602, a concave portion of the edge of the adhesive 106 (second edge portion according to the present invention). ) Crosses over the relatively thin antenna portion 601a, and the convex portion of the edge of the adhesive 106 (corresponding to an example of the first edge portion according to the present invention) has a relatively thick antenna portion 601b. It will cross over.

  The base portion 101j around the relatively thin antenna portion 601a is bent inscribed in the convex portion at the edge of the adhesive 106 when the RFID tag 600 is bent along the same bending line L as in the first embodiment. The bending radius is reduced in a state where the bending radius is relatively larger and the bending radius is dispersed than the base portion 101k around the relatively thick antenna portion 601b and the other base portion 101m, and disconnection is avoided. Here, regarding the base portion 101k around the relatively thick antenna portion 601b, the bending radius is relatively small, and there is a concern about the concentration of bending stress on the antenna portion 601b. In this embodiment, the antenna portion 601b Since the strength against bending stress is strengthened, disconnection of the antenna portion 601b is avoided. That is, also in the RFID tag 600 of this embodiment, the bending stress to the circuit chip is reduced and the disconnection of the antenna is avoided as in the first to fifth embodiments.

  Next, a seventh embodiment of the RFID tag according to the present invention will be described.

  FIG. 7 is a top view showing a seventh embodiment of the RFID tag according to the present invention.

  In FIG. 7, the same components as those of the first embodiment shown in FIG. 1 described above are denoted by the same reference numerals as those in FIG. Omitted.

The RFID tag 700 shown in FIG. 7 is different from the shape of the reinforcing body 105 in the first embodiment shown in FIG. 1 in the shape of the reinforcing body 702 that plays a role of reducing bending stress to the circuit chip. Further, the antenna 701 including four antenna portions 701a, 701b, 701c, and 701d is wired on the base 101, which is different from the RFID tag 100 of the first embodiment shown in FIG. A combination of the reinforcing member 702 of the RFID tag 700 and the adhesive 106 that adheres and fixes the reinforcing member 702 to the base 101 corresponds to an example of the chip reinforcing member according to the present invention. Further, the antenna 701 shown in FIG. 7 corresponds to an example of the antenna according to the present invention. The reinforcing body 702 of the RFID tag 700 shown in FIG. It has curvilinear uneven edges and has two straight chamfered portions on the left side. The reinforcing body 702 has two concave portions whose edges intersect with the two antenna portions 701a and 701b extending on the right side in the figure, and whose lower chamfered portion intersects with the antenna portion 701c extending on the left side. The chamfered portion is arranged so as to intersect with the antenna portion 701d extending obliquely upward to the left. As a result, at the edge of the adhesive 106 that adheres and fixes the reinforcing body 702 to the base 101, along the edge of the reinforcing body 702, two concave portions (the second in the present invention referred to in the present invention). Is equivalent to an example of the edge portion of the two antenna portions 701a and 701b extending to the right in the drawing, and extends along the lower chamfered portion (as an example of the second edge portion according to the present invention). Equivalent) crosses over the antenna portion 701c extending leftward, and an edge along the upper chamfered portion (corresponding to an example of the second edge portion according to the present invention) crosses over the antenna portion 701d extending obliquely upward to the left. It will be.

  When the RFID tag 700 bends along a bending line L1 along the portion of the right edge of the adhesive 106 that extends most in the longitudinal direction, each of the two antenna portions 701a and 701b that each recess crosses is provided. The peripheral base portion 101n bends in a state where the bending stress is dispersed. Further, when the RFID tag 700 bends at a bend line L2 along the portion of the left edge of the adhesive 106 that extends most in the longitudinal direction, two antenna portions 701c that the edge along the chamfered portion crosses. , 701d, the base portion 101p around each bends in a state where the bending stress is dispersed. Further, the antenna portions 701c and 701d whose edges along the chamfered portion cross obliquely are strong against bending stress. As described above, disconnection of the antenna 701 having the four antenna portions 701a,. That is, also in the RFID tag 700 of this embodiment, the bending stress to the circuit chip is reduced and the disconnection of the antenna is avoided as in the first to sixth embodiments.

  In the above description, the hole in which the circuit chip is accommodated is illustrated only for the reinforcing body of the type with four rounded corners (reinforcing body 301 in FIG. 3), but the present invention is not limited to this. Such a hole may be provided in a reinforcing body having a concavo-convex edge as shown in FIG. 1, FIG. 5 or FIG. 6, or four corners as shown in FIG. 4 are chamfered. It may be provided on the other type of reinforcing body, or may be provided on a reinforcing body of a type having an uneven edge and a chamfered portion as shown in FIG.

  In the above description, the back side reinforcing body for enhancing the reduction of the bending stress to the circuit chip is exemplified only for the reinforcing body 301 of the type provided with the hole for storing the circuit chip shown in FIG. This is not a limitation. Such a back side reinforcing body may be used together with a reinforcing body having a concavo-convex edge as shown in FIG. 1, FIG. 5 or FIG. 6, or chamfered at four corners as shown in FIG. It may be used together with the type of reinforcement provided, or may be used together with a type of reinforcement having an uneven edge and a chamfered portion as shown in FIG.

100, 200, 300, 400, 500, 600, 700, 800, 900 RFID tag 101, 801 base 101a, 101b, 101c, 101d, 101e, 101f, 101g, 101h, 101j, 101k, 101m, 101n, 101p base part 102, 201, 501, 601, 701, 802 Antenna 103, 803 Circuit chip 104, 106, 804, 902 Adhesive 105, 202, 301, 401, 502, 602, 702, 902 Reinforcement body 302 Back side reinforcement body 501a, 601a , 601b, 701a, 701b, 701c, 701d Antenna part

Claims (4)

A base that can be bent back and
An antenna for communication wired on the base;
A circuit chip that is electrically connected to the antenna and performs wireless communication via the antenna;
A chip reinforcing body that covers at least the periphery of the circuit chip and a part of the wiring of the antenna at least upward when the base is down, and a first edge portion where the base is inscribed and bent A chip reinforcing body having a second edge portion that is located on the inner side of the bending of the base than the first edge portion and intersects with the wiring of the antenna ;
An RFID tag characterized in that a bending radius of the base when the base bends inscribed in the first edge is larger in the vicinity of the second edge than in the vicinity of the first edge .   The chip reinforcing body has a concavo-convex edge, the concavo-convex convex portion serves as the first rim, and the concavo-convex concave portion serves as the second rim. The RFID tag according to claim 1. The base is elongated in a predetermined direction;
The antenna extends along the predetermined direction;
2. The RFID tag according to claim 1, wherein the chip reinforcing body has the second edge portion obliquely crossing the wiring of the antenna with respect to the predetermined direction. The antenna has two types of antenna parts having different wiring thicknesses,
The chip reinforcement body intersects the wiring of the antenna portion having a relatively thick wiring among the two types of antenna portions at the first edge portion, and the two types of antenna portions at the second edge portion. The RFID tag according to claim 1, wherein the wiring is crossed with the wiring of the antenna portion having a relatively thin wiring thickness.

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