JP2018081422A - Information recording medium, installation body, and auxiliary antenna - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an information recording medium capable of suppressing a decrease in a communicable distance even if an opposing angle between an antenna of a reader/writer and an antenna of the information recording medium changes, a mounted body having the information recording medium, and an auxiliary antenna to be used for the information recording medium.SOLUTION: An information recording medium 10 includes an antenna 13 and an IC chip 12 for perform non-contact communication via the antenna 13. The antenna 13 is a loop antenna with at least one turn loop continuously connected from one edge to the other edge. The antenna 13 includes a plurality of loop portions 13A, 13B, 13C defining a plurality apertures, respectively, in which the loop portion 13B is different in winding direction from the loop portions 13A, 13C.SELECTED DRAWING: Figure 2

Description

  The present invention relates to an information recording medium, a mounting body, and an auxiliary antenna.

  A non-contact IC card and an IC tag (hereinafter referred to as a non-contact type information recording medium) include at least an IC chip having a non-contact communication function and a data storage function such as a transmission / reception circuit and a memory, and an antenna. The IC chip provided in the non-contact type information recording medium is driven by an electromagnetic wave transmitted from an antenna provided in an electromagnetic induction communication device (reader / writer) via an antenna connected to the IC chip. Receive the supply. In addition, the non-contact information recording medium and the electromagnetic induction communication device perform data transmission / reception by receiving driving power and returning an analog signal in the IC chip to the electromagnetic induction communication device (reader / writer) side. ing. Communication systems using contactless information recording media are used in various fields such as transportation systems, electronic money, employee ID systems, logistics management, and game systems.

  As a communication method using a non-contact information recording medium, an electromagnetic coupling method, an electrostatic coupling method, an electromagnetic induction method, and a radio wave method are used according to the communication frequency band. In the transportation system, electronic money, employee ID system, game system, etc., the electromagnetic induction method is currently mainstream. A non-contact IC communication system using an electromagnetic induction system is standardized by ISO / IEC 14443, 15693, and 18092. In this non-contact IC communication system using the electromagnetic induction method, a signal frequency of 13.56 MHz is used, and a non-contact type information recording medium corresponding to the electromagnetic induction method is provided with a loop antenna. .

  In the electromagnetic induction method, a magnetic field is generated in the vicinity of the reader / writer antenna by passing a current through the reader / writer antenna. When the non-contact information recording medium is brought close to the reader / writer, the magnetic field passes through the antenna provided in the non-contact information recording medium, and the antenna provided in the non-contact information recording medium due to the change in magnetic flux accompanying the magnetic field passage. As a current flows through, a dielectric electromotive force is generated. In general, when the aperture of the antenna provided in the non-contact information recording medium is wider, the amount of magnetic field passing through the antenna increases and the induced electromotive force also increases, so that the maximum communication distance tends to be longer. In addition, by adjusting the number of turns of the antenna and the amount of capacitor connected to the antenna so that the resonance frequency of the antenna in the non-contact information recording medium approaches the same as the communication frequency, the reception efficiency is further increased, and the induction frequency is further increased. Electric power is increased.

  As a usage form of such a non-contact information recording medium, for example, it may be configured and used as a mounting body that can be easily mounted on a human body or an article. For example, Patent Document 1 proposes an RFID label that can be attached to a wristband or the like used in a medical field, and an identification tag in which the RFID label is attached to the wristband.

JP2013-109445A

  In general, as described above, it is desirable that the aperture of the antenna provided on the information recording medium is large. However, when the information recording medium is built in or attached to the wristband, the information recording medium built in the wristband needs to be small in size if importance is attached to the wearability and design. . When the information recording medium is reduced in size, the antenna provided in the information recording medium is also reduced, so that the maximum communication distance is shortened as compared with a card-type information recording medium having a large antenna aperture.

  Further, when the antenna length is increased in order to increase the antenna diameter of the information recording medium included in the wristband, the antenna portion is also curved in a ring shape when the wristband is used. In this case, the direction in which the magnetic field passes through the antenna differs depending on the location of the antenna, and the direction in which the current generated by the change in the magnetic field flows is also opposite. As a result, the currents flowing in the opposite directions cancel each other, and the induced electromotive force may be lowered. Therefore, even if the antenna length is increased, the communication distance at a specific antenna length becomes a peak, and it is difficult to obtain a communication distance longer than that.

  Further, when the wrist rotates, the wristband rotates together with the built-in information recording medium and its antenna. Therefore, the direction of the information recording medium and its antenna that are brought close to the reader / writer tends to become unstable. In addition, the wrist rotation angle at which the wristband can be easily approached varies depending on the situation such as males, females, human habits, and possession of belongings. Therefore, the user is not always allowed to hold the wristband (information recording medium) over the reader / writer at the optimum rotation angle, and the use at various rotation angles actually exists.

  When the antenna of the reader / writer and the antenna of the information recording medium face each other in parallel, the magnetic field passing through the antenna of the information recording medium is increased and the maximum communication distance is increased. Conversely, as the antenna of the information recording medium rotates, the magnetic field passing through the antenna of the information recording medium becomes smaller and the maximum communication distance becomes shorter. Therefore, depending on how the wristband is held over the reader / writer, the facing angle between the reader / writer antenna and the antenna in the wristband differs, the communication distance fluctuates greatly, and the frequency of occurrence of communication errors is different from that in the card form. There was a tendency to increase compared to the case.

  An object of the present invention is to provide an information recording medium capable of suppressing a decrease in the communicable distance even when the facing angle between the antenna of the reader / writer and the antenna of the information recording medium changes, a mounting body including the information recording medium, and information And providing an auxiliary antenna for use in a recording medium.

  The present invention solves the above problems by the following means. In addition, in order to make an understanding easy, although the code | symbol corresponding to embodiment of this invention is attached | subjected and demonstrated, it is not limited to this.

  The first invention is an information recording medium comprising an antenna (13, 33, 43) and an IC chip (12, 32, 42) that performs non-contact communication via the antenna (13, 33, 43). (10, 30, 40), and the antenna (13, 33, 43) is continuously connected from one end to the other end, and the antenna (13, 33, 43) is A plurality of loop portions (13A, 13B, 13C, 43A, 43B, 43C) each forming a loop of one turn or more are provided, and at least one of the plurality of loop portions (13B, 43C) The parts (13A, 13C, 43A, 43B) are information recording media (10, 30, 40) having different winding directions.

  The second invention is the information recording medium (10, 30, 40) according to the first invention, wherein the information recording medium (10, 30, 40) is in the use state, the antenna (13, 33, 40). 43) When the formation surface of 43) is viewed from the side, the antenna (13, 33, 43) is used in a curved state so as to form a part of an annular shape, and at least one of the plurality of loop portions is used. (13B, 43B) is arranged to occupy a range of a length of ± 20% of a half circumference of the annular shape formed by the antenna (13, 33, 43) in the use state. It is an information recording medium (10, 30, 40) characterized.

  3rd invention is the information recording medium (10, 30, 40) as described in 1st invention or 2nd invention, It is provided with the display part (38) which can rewrite-display information, Information characterized by the above-mentioned It is a recording medium (10, 30, 40).

  A fourth invention includes the information recording medium (10, 30, 40) according to any one of the first to third inventions, and forms at least a part of an annular shape in a mounted state. It is a mounting body (100, 300) provided with a band body (101) which is in a curved state and is mounted on a human body or an object.

  5th invention is with respect to the said antenna (23) of an information recording medium (27) provided with the antenna (23) and IC chip (22) which performs non-contact communication via the said antenna (23). Auxiliary antenna (24) used in a non-contact state, said auxiliary antenna (24) starting from a certain position on the conductor and continuing from the start point to the original start point following the path of the conductor. The auxiliary antenna (24) includes a plurality of loop portions (23A, 23B, 23C) each forming a loop of one turn or more, and at least one of the plurality of loop portions (23B). Is an auxiliary antenna (24) having a different winding direction from the other loop portions (23A, 23C).

  According to a sixth aspect of the present invention, in the auxiliary antenna (24) according to the fifth aspect of the present invention, when the auxiliary antenna (24) is in use, when the formation surface of the auxiliary antenna (24) is viewed from the side, It is used in a curved state so as to constitute a part of an annular shape, and at least one (23B) of the plurality of loop portions (23A, 23B, 23C) is formed by the auxiliary antenna (24) in the used state. The auxiliary antenna (24) is characterized in that it is arranged so as to occupy a range of a length of ± 20% of the length of a half circumference of the annular shape.

  The seventh invention is an information recording medium (27) used together with the auxiliary antenna (24) according to the fifth or sixth invention, comprising a display unit (38) capable of rewriting and displaying information. The information recording medium characterized by the above.

  The eighth invention comprises the auxiliary antenna (24) according to the fifth invention or the sixth invention, and is in a curved state so as to form a part of a ring shape at least in the mounted state, and thus the human body or object It is a mounting body (200) provided with the band main body (201) mounted with respect to a thing.

  According to the present invention, an information recording medium capable of suppressing a decrease in the communicable distance even when the facing angle between the antenna of the reader / writer and the antenna of the information recording medium changes, the mounting body including the information recording medium, and the information An auxiliary antenna used for a recording medium can be provided.

It is a figure which shows 1st Embodiment of the wristband 100 provided with the information recording medium 10 by this invention. 1 is an enlarged view showing an information recording medium 10. FIG. 3 is a perspective view showing an example of a usage state of the wristband 100. FIG. It is the figure which looked at the state of FIG. 3 from the side surface direction. FIG. 6 is a perspective view showing another example of the usage state of the wristband 100. It is the figure which looked at the state of FIG. 5 from the side surface direction. FIG. 6 is a perspective view showing another example of the usage state of the wristband 100. It is the figure which looked at the state of Drawing 7 from the side. It is the figure which looked at the wristband 100 which changed the dimension of the antenna 13 from the side surface direction in the recommended use condition. It is a figure which shows the state which the wrist rotated a little from the state of FIG. It is a figure which shows the state which the wrist rotated further from the state of FIG. It is a figure which shows the information recording medium 10 of the modification of 1st Embodiment. It is a figure which shows the wristband 200 of 2nd Embodiment. 2 is an enlarged view of an information recording medium 20. FIG. It is a figure which shows the modification of 2nd Embodiment. It is a figure which shows the wristband 300 of 3rd Embodiment. It is a figure which shows the modification regarding arrangement | positioning of an antenna. It is a figure which shows the example of the wristband which changed the number of loop parts of an antenna similarly to FIG. It is a figure which shows the example of the wristband which does not have a fastener similarly to FIG. It is a figure which shows the other example of the wristband which is not provided with a fastener similarly to FIG. It is a figure which shows the example of the wristband comprised in the substantially C shape by which one part was notched similarly to FIG.

  The best mode for carrying out the present invention will be described below with reference to the drawings.

(First embodiment)
FIG. 1 is a diagram showing a first embodiment of a wristband 100 including an information recording medium 10 according to the present invention. FIG. 1 is a view of the inner surface of the annular shape formed when the wristband 100 is attached.
In addition, each figure shown below including FIG. 1 is the figure shown typically, and the magnitude | size and shape of each part are exaggerated suitably for easy understanding.
In the following description, specific numerical values, shapes, materials, and the like are shown and described, but these can be changed as appropriate.
The wristband 100 of the present embodiment is used by being wrapped around a user's wrist and includes a band main body 101 and an information recording medium 10 built in the band main body 101. .

  The band main body 101 is formed of a member having flexibility and magnetic permeability, such as silicon rubber, for example. The band main body 101 of the present embodiment is in a flat shape as shown in FIG. 1 in a free state where no force is applied, and is bent and annular (side (shown in FIG. 4) when worn on the user's wrist. The shape as viewed from the state) is used in the form of a ring. The band main body 101 may be formed in an annular shape or a C-shape (a substantially annular shape with a part opened) in a free state.

The band body 101 includes a through hole 101a and an engagement protrusion 101b.
A plurality of through holes 101 a are arranged side by side in the direction along the longitudinal direction of the band body 101 on one end side (right end side in the example of FIG. 1) of the band body 101.
The engagement protrusion 101b is configured to protrude from the plane of the band body 101 in one direction (in the example of FIG. 1, the back side of the paper surface) on the other end side (left end side in the example of FIG. 1) of the band body 101. . The engagement protrusion 101b can hold | maintain the state engaged with the through-hole 101a by press-fitting in the through-hole 101a. In addition, you may provide the retainer with a large outer shape in the front end side of the engagement protrusion 101b.
The information recording medium 10 built in the band main body 101 may be manufactured by being arranged in the band main body 101 when the band main body 101 is formed, or a space (a slit or the like) into which the information recording medium 10 can be inserted. The band main body 101 may be inserted after the provided band main body 101 is created.

FIG. 2 is an enlarged view of the information recording medium 10. In FIG. 2, the antenna 13 and the IC chip 12 arranged in the base material 11 are shown by a solid line as seen through.
The information recording medium 10 includes a base material 11, an IC chip 12, and an antenna 13. The information recording medium 10 alone is configured as an RFID inlet having a function as an RFID medium.
The base material 11 is a thin sheet-like member formed of a thermoplastic resin sheet such as PET (polyethylene terephthalate).
Note that the information recording medium 10 can satisfy its function as long as the IC chip 12 and the antenna 13 are provided on the substrate 11. However, in this embodiment, in order to protect the IC chip 12 and the antenna 13, an insulating film such as vinyl chloride resin, PET, and PET-G is laminated on the information recording medium 10 to form an IC having a thickness of 0.4 mm. A thin plate having the chip 12 and the antenna 13 incorporated therein is used.

  The IC chip 12 is a semiconductor integrated circuit element, and identification information or the like corresponding to the purpose of use of the wristband 100 is recorded. The IC chip 12 is mounted on one surface of the base material 11. The IC chip 12 is electrically connected to the antenna 13, and necessary power is supplied from the antenna 13. The IC chip 12 includes a transmission / reception circuit and a memory that perform non-contact communication with an external reader / writer (not shown) via the antenna 13, and authenticates and rewrites identification information. The IC chip 12 of this embodiment is assumed to have a non-contact communication function conforming to the ISO / IEC 14443 Type A system.

The antenna 13 is an antenna for the IC chip 12 to communicate with an external reader / writer. The antenna 13 of this embodiment is configured by connecting a coated copper wire antenna to the antenna connection terminals 12 a and 12 b of the IC chip 12.
The antenna 13 of the present embodiment is a loop antenna that is continuously (in one stroke) connected from the end connected to the antenna connection terminal 12a to the other end connected to the antenna connection terminal 12b. The antenna 13 includes three loop portions 13A, 13B, and 13C that form three openings 13Aa, 13Ba, and 13Ca, respectively. Of these three loop portions 13A, 13B, and 13C, the loop portion 13B includes The winding direction is different from that of the other loop portions 13A and 13C.
In addition, although the conducting wire path | route of the antenna 13 cross | intersects in the figure, since the covered copper wire is used, the insulation is ensured.

More specifically, the antenna 13 is arranged in the order of the loop portion 13A, the loop portion 13B, and the loop portion 13C from the left when viewed from the direction shown in FIG. Then, the winding direction of the antenna 13 from the antenna connection terminal 12a to the antenna connection terminal 12b from the antenna connection terminal 12a to the end antenna connection terminal 12b is clockwise for the loop portion 13A, counterclockwise for the loop portion 13B, and clockwise for the loop portion 13C. It is formed so as to go around.
The path of the conductive wire of the antenna 13 of the present embodiment starts from the antenna connection terminal 12a and passes through a part of the counterclockwise loop of the loop portion 13B, and then goes around the loop portion 13C clockwise and turns to the left of the loop portion 13B. It passes through a half circumference of the loop, then goes around the clockwise direction of the loop part 13A, passes through a part of the counterclockwise loop of the loop part 13B, and returns to a position passing through the vicinity of the antenna connection terminal 12a. This is repeated once, and each loop part of 3 turns is constituted by repeating 3 times. In other words, in the present embodiment, each loop portion is configured while drawing a trajectory that connects the figure 8s.

  The wristband 100 is worn on a person's wrist. Although there are individual differences, the standard wrist length is 170 mm for adult men and 150 mm for adult women. By making the size of the antenna 13 suitable for this, the convenience can be expected to be improved. Therefore, in the present embodiment, first, the loop portion 13A has a size of 15 mm × 40 mm and a winding number of 3 turns, the loop portion 13B has a size of 15 mm × 60 mm and a winding number of 3 turns, and the loop portion 13C has a size of 15 mm × 40 mm. A product with 3 turns was produced. In addition, a resonance frequency adjusting capacitor (not shown) was connected to the loop portion 13A, and adjustment was performed so that the resonance frequency was about 14 MHz.

Next, communication characteristics in the usage state of the wristband 100 of the present embodiment will be described.
FIG. 3 is a perspective view illustrating an example of a usage state of the wristband 100.
FIG. 4 is a view of the state of FIG. 3 as viewed from the side. In FIG. 4 and similar drawings to be described later, the loop portion is indicated by a broken line, and the interval between the broken lines is changed to indicate a different loop portion. For example, in FIG. 4, the loop portion 13A and the loop portion 13C are indicated by short wavy lines, the loop portion 13B is indicated by long wavy lines, and other configurations are omitted as appropriate.
As shown in FIGS. 3 and 4, the wristband 100 is a usage method recommended in a usage state in which the loop portion 13 </ b> B is brought close to the reader / writer RW. (Not shown). In this recommended use state, the area of the opening 13Ba of the loop portion 13B that directly faces the reader / writer RW is maximized, and the current generated in the antenna 13 by the magnetic force lines M from the reader / writer RW is also maximized. Therefore, in this use state, the wristband 100 has the best communication conditions and the longest communicable distance.
Here, in order to facilitate understanding, description will be made on the assumption that the magnetic force lines M in the direction shown in the figure are assumed. However, in reality, the direction of the magnetic force lines M is repeatedly reversed, and the antenna 13 has an alternating current. Will occur. Therefore, the direction of the lines of magnetic force M explains the situation at a certain moment.

FIG. 5 is a perspective view showing another example of the usage state of the wristband 100.
FIG. 6 is a view of the state of FIG. 5 as viewed from the side.
The state shown in FIGS. 5 and 6 is a state in which the wrist is slightly rotated from the state shown in FIGS. 3 and 4 and the position is slightly shifted to the left in FIG. 6 from the reader / writer RW. In this state, since the loop portion 13B is inclined without facing the reader / writer RW, the apparent area of the loop portion 13B viewed from the reader / writer RW is reduced. Therefore, the lines of magnetic force M penetrating through the loop portion 13B are also reduced, and the current generated in the loop portion 13B by being electromotive in the loop portion 13B becomes smaller than in the states of FIGS. Here, the magnetic force line M that has penetrated the magnetic force line M that penetrates the loop portion 13B travels as it is and reaches the loop portion 13C. At this time, since the wristband 100 is curved in an annular shape, in the loop portion 13C, the surface opposite to the surface (outside of the wristband 100) where the magnetic lines of force M enter in the previous loop portion 13B (inside of the wristband 100) ) That is, in the loop part 13C and the loop part 13B, the direction in which the magnetic lines of force M travel is opposite.

  Assume that the antenna of the same size as the wristband 100 of the present embodiment is configured as a conventional antenna wound in the same direction. In this case, in the state as shown in FIGS. 5 and 6, the direction in which the current generated by the magnetic lines M penetrating from the outside of the wristband and the current generated by the magnetic lines M penetrating from the inside of the wristband flow. Each is reversed. Therefore, both currents cancel each other, resulting in a smaller current, and a communicable distance is greatly deteriorated.

  However, in the wristband 100 of the present embodiment, even in the state shown in FIGS. 5 and 6, the direction in which the magnetic lines of force M travel in the loop portion 13C and the loop portion 13B is opposite (from the outside to the inside). It becomes the direction. The direction in which the current generated by the electromotive force generated by the magnetic field lines M follows Fleming's right-hand rule in electromagnetic induction. Therefore, in the loop portion 13B, current is generated in the direction indicated by the arrow IB in FIGS. 1 and 2, and in the loop portion 13C, current is generated in the direction indicated by the arrow IC in FIGS. In the loop portion 13C and the loop portion 13B, the winding directions of the windings are clockwise and counterclockwise, respectively, and vice versa. Therefore, the direction of the current flowing in the loop portion 13C and the loop portion 13B is the current flowing in the antenna 13 in the direction of flowing from the antenna connection terminal 12a to the antenna connection terminal 12b. It is possible to obtain a current larger than the current obtained by only the above. In addition, the currents cancel each other as in the case of the configuration using one large antenna as described above, a good communication state can be maintained, and a decrease in communication distance can be prevented.

(First variation of the first embodiment)
FIG. 7 is a perspective view illustrating another example of the usage state of the wristband 100.
FIG. 8 is a view of the state of FIG. 7 as viewed from the side.
The state shown in FIGS. 7 and 8 is a state in which the wrist is rotated approximately 90 degrees from the state shown in FIGS. 3 and 4.
3 and FIG. 4, in a state where the wrist is rotated by approximately 90 degrees, the magnetic field lines M passing through the loop portion 13A from the outside toward the inside pass through the loop portion 13C from the inside toward the outside. In this case, it is assumed that the current generated in the loop unit 13A and the current generated in the loop unit 13C cancel each other, making communication difficult.

Therefore, the dimensions of the antenna 13 were further reviewed, and a wristband 100 in a form capable of communication even when the wrist was rotated by approximately 90 degrees was further manufactured.
Specifically, in the antenna 13 of the wristband 100 additionally manufactured in the present embodiment, the loop portion 13A has a size of 15 mm × 30 mm and a winding number of 3 turns, and the loop portion 13B has a size of 15 mm × 80 mm and a winding number of 3 The loop portion 13C has a size of 15 mm × 30 mm and a winding number of 3 turns. As a result, the length of the loop portion 13B is half of the average length of 160 mm around the wrist of adult men and women. Therefore, when the wristband 100 is worn around the wrist in an annular shape, the loop portion 13B occupies a substantially half circumference.

FIG. 9 is a view of the wristband 100 in which the dimensions of the antenna 13 are changed as viewed from the side in a recommended use state.
In the recommended use state as shown in FIG. 9, it is possible to receive the magnetic lines of force M in a large area of the loop portion 13B, and the communication state is better than the case of the antenna 13 shown earlier in the present embodiment, The communicable distance can be increased. In this state, the magnetic lines of force M passing through the loop portion 13A and the loop portion 13C are very small and do not significantly affect the communication characteristics.

FIG. 10 is a diagram illustrating a state where the wrist is slightly rotated from the state of FIG. 9.
In this state, since the loop portion 13B is inclined without facing the reader / writer RW, the apparent area of the loop portion 13B viewed from the reader / writer RW is reduced. Therefore, the lines of magnetic force M penetrating the loop portion 13B are also reduced, and the current generated in the loop portion 13B by being electromotive in the loop portion 13B is smaller than in the state of FIG. Here, the magnetic force line M that has penetrated the magnetic field line M that penetrates the loop part 13B proceeds as it is, and a part thereof reaches the loop part 13C. At this time, since the wristband 100 is curved in an annular shape, in the loop portion 13C, the surface opposite to the surface (outside of the wristband 100) where the magnetic lines of force M enter in the previous loop portion 13B (inside of the wristband 100) ) That is, in the loop part 13C and the loop part 13B, the direction in which the magnetic lines of force M travel is opposite.

  In the wristband 100 of the present embodiment, since the loop portion 13B occupies a substantially half circumference, even in the state shown in FIG. 10, the direction in which the magnetic force lines M travel is the front and back (from the outside) in the loop portion 13C and the loop portion 13B. And from the inside). In the loop portion 13C and the loop portion 13B, the winding directions of the windings are clockwise and counterclockwise, respectively, and vice versa. Therefore, the direction of the current flowing in the loop portion 13C and the loop portion 13B is the current flowing in the antenna 13 in the direction of flowing from the antenna connection terminal 12a to the antenna connection terminal 12b. It is possible to obtain a current larger than the current obtained by only the above. In addition, current canceling as in the case of the configuration using one large antenna as described above does not occur, a good communication state can be maintained, and a decrease in communicable distance can be prevented.

FIG. 11 is a diagram showing a state in which the wrist is further rotated from the state of FIG.
As shown in FIG. 11, when the wrist rotates greatly from the recommended direction so that the loop portion 13A faces the reader / writer RW, the magnetic lines of force M first appear outside the loop portion 13A. Pass through from the inside. Further, when the magnetic force line M reaches the loop portion 13A, it passes through the loop portion 13B from the inside toward the outside. In this case, the direction of the current is opposite to the case of FIG. 9 and FIG. 10 described above, but the direction of the current flowing through the loop portion 13A and the loop portion 13B is the same.
Therefore, as shown in FIG. 11, even when the wrist is greatly rotated over 90 degrees, it is possible to prevent a significant deterioration in communication characteristics and a reduction in the communicable distance. it can.

The wristband 100 of the present embodiment including the antenna 13 described above (the size of the loop portion 13A is 15 mm × 30 mm, the size of the loop portion 13B is 15 mm × 80 mm, the size of the loop portion 13C is 15 mm × 30 mm), and the conventional loop is one The communication distance with a wristband provided with an antenna (size: 15 mm × 80 mm) was compared. Each wristband was wound around a cylinder having a diameter of 25 mm (outer circumference: about 160 mm), and the communication distance was compared.
As a result, the wristband of this embodiment has a result that the maximum communication distance is increased by about 10%. In addition, communication was impossible when the conventional product was rotated approximately 90 degrees, whereas communication was possible when the developed product was rotated approximately 90 degrees.

  From the above results, it can be seen that it is desirable that at least one of the plurality of loop portions occupy a range of a length corresponding to a half circumference of the annular shape formed by the antenna in use. Further, as described above, there are gender differences and individual differences in the length around the wrist, and there are personal habits and the like, and there is no need to stick to exactly half the length. As a result of examination, it has been found that when the length of one end side of the loop portion 13B changes by about ± 10%, it is possible to obtain substantially the same communication characteristics as those of the present embodiment. Therefore, it is reasonable to set the allowable width at both ends of the loop portion 13B as ± 20%. Therefore, it is desirable that at least one of the plurality of loop portions be disposed so as to occupy a range of a length of ± 20% of the length of the half circumference of the annular shape formed by the antenna in use.

(Second modification of the first embodiment)
In the above-described embodiment, the example in which each loop portion is configured while drawing a trajectory in which the figure 8 is connected has been described. However, one antenna 13 may be configured by connecting, for example, three windings for each loop portion.
FIG. 12 is a diagram showing an information recording medium 10 according to a modification of the first embodiment.
In the example shown in FIG. 12, the winding direction of the antenna 13 from the antenna connection terminal 12a to the antenna connection terminal 12b at the end point starts from the antenna connection terminal 12a, the loop part 13A turns clockwise, the loop part 13B turns counterclockwise, The point that the part 13 </ b> C is formed so as to rotate clockwise is the same as the above-described embodiment. However, in the example shown in FIG. 12, even if the loop portion 13A, the loop portion 13B, and the loop portion 13C are cut at the portions that connect them, one loop is completed. ing. That is, when the path of the conductor of the antenna 13 is followed, the loop portion 13A makes three turns clockwise, the adjacent loop portion 13B makes three turns counterclockwise, and the adjacent loop portion 13C makes three turns clockwise. Yes.
Even if the antenna 13 has such a configuration, it is possible to obtain the same operations and effects as the above-described embodiment.

  As described above, according to the first embodiment, the antenna 13 includes a plurality of loop portions that respectively form a plurality of openings, and at least one of the plurality of loop portions is connected to another loop portion. Have different winding directions. Therefore, when a non-contact communication with the reader / writer is performed after the information recording medium is incorporated into the wristband and curved, the magnetic field generated by the reader / writer passes through a loop portion and then passes through another loop portion. However, the direction of the current induced by the magnetic field is the same for the antenna and does not cancel each other. As a result, the antenna opening area is larger than that of the conventional configuration in which the antenna opening area is configured by only one loop, so that the reception power of the antenna is increased and the maximum communication distance can be increased. Further, even if the antenna is rotated in a bending direction and held over the reader / writer in a direction different from the originally recommended direction, it is possible to suppress a reduction in communication distance.

  In particular, by arranging at least one of the plurality of loop portions to occupy a range of a length of ± 20% of the length of the annular half circumference formed by the antenna in use, the area is large, The structure has no magnetic field reception loss, and the maximum communication distance can be further increased. Further, the allowable range of the angle over which the wristband is held over the reader / writer is further increased. Therefore, an information recording medium and a wristband that are more convenient to use can be obtained.

  Furthermore, by providing the information recording medium on the wristband, the user can wear the information recording medium on the wrist, etc., and there is no need to carry a wallet, pass case, etc. Convenience in environments where it is difficult to carry a wallet or pass case. Note that the wristband of the present embodiment may have a flexible structure that does not include a fastener or a structure that includes a fastener.

(Second Embodiment)
FIG. 13 is a diagram illustrating a wristband 200 according to the second embodiment.
FIG. 14 is an enlarged view of the information recording medium 20. In FIG. 14, the antenna 25, the IC chip 22, and the auxiliary antenna 23 are shown in a solid line as seen through.
The wristband 200 of the second embodiment has the same form as the wristband 100 of the first embodiment, except that the information recording medium 20 is different from the information recording medium 10 of the first embodiment. Therefore, portions having the same functions as those in the first embodiment described above are denoted by the same reference numerals at the end, and redundant description is appropriately omitted.

The wristband 200 according to the second embodiment includes a band main body 201 and an information recording medium 20 built in the band main body 201.
The information recording medium 20 of the second embodiment is configured by overlapping an auxiliary antenna sheet 24 and an RFID inlet 27.

The auxiliary antenna sheet 24 includes an auxiliary antenna 23 and an antenna base material 26.
The antenna base material 26 is a thin sheet-like member formed of a thermoplastic resin sheet such as PET (polyethylene terephthalate), for example, similarly to the base material 11 of the first embodiment.
The auxiliary antenna sheet 24 can satisfy its function as long as the auxiliary antenna 23 is provided on the antenna base 26. However, in this embodiment, in order to protect the auxiliary antenna 23, as in the information recording medium 10 of the first embodiment, an insulating film such as a vinyl chloride resin, PET, or PET-G is laminated to have a thickness. It is in the form of a thin plate incorporating a 0.3 mm auxiliary antenna 23.

The auxiliary antenna 23 is an antenna used in a non-contact state with respect to the antenna 25 of the RFID inlet 27.
The auxiliary antenna 23 is a loop antenna that is connected continuously (with a single stroke) from a certain position on the conductor as a starting point, following the path of the conductor from the starting point to returning to the original starting point. The auxiliary antenna 23 includes three loop portions 23A, 23B, and 23C that form three openings 23Aa, 23Ba, and 23Ca, respectively, and the loop portion 23B of the three loop portions 23A, 23B, and 23C. Is different in winding direction from the other loop portions 23A and 23C.

More specifically, the antenna 13 is arranged in the order of the loop portion 23A, the loop portion 23B, and the loop portion 23C from the left when viewed from the direction shown in FIG. Then, the winding direction of the auxiliary antenna 23 from a certain position (arbitrary position) on the conductor to the original starting point after following the path of the conductor from the starting point is the loop part 23A clockwise, and the loop part 23B Is formed so as to rotate counterclockwise and the loop portion 23C rotates clockwise.
The conductive wire path of the auxiliary antenna 23 of the present embodiment follows, for example, the path from the position P on the loop portion 23B to the original position P following the conductor path from the start point (position P). Then, after passing through a part of the counterclockwise loop of the loop part 23B, the loop part 23C goes around the clockwise direction, passes through the counterclockwise half of the loop part 23B, and then goes around the clockwise part of the loop part 23A. It goes around once, passes through a part of the counterclockwise loop of the loop portion 23B, and returns to a position passing through the vicinity of the antenna connection terminal 22a. This is repeated once, and each loop part of 3 turns is constituted by repeating 3 times. In other words, in the present embodiment, each loop portion is configured while drawing a trajectory that connects the figure 8s.

  Further, in the auxiliary antenna 23 of the present embodiment, the loop portion 23A has a size of 15 mm × 30 mm and a winding number of 3 turns, the loop portion 23B has a size of 15 mm × 80 mm and a winding number of 3 turns, and the loop portion 23C has a size of 15 mm. × 30 mm, winding number 3 turns. In addition, a resonance frequency adjusting capacitor (not shown) was connected to the loop portion 23A, and the resonance frequency was adjusted to about 14 MHz.

The RFID inlet 27 includes a base material 21, an IC chip 22, and an antenna 25. The RFID inlet 27 also has a function as one information recording medium capable of non-contact communication.
The RFID inlet 27 has a configuration in which a small antenna 25 is connected to the antenna connection terminals 22a and 22b of the IC chip 22 having a non-contact communication function conforming to the ISO / IEC 14443 Type A system. The IC chip 22 and the antenna 25 are disposed on the base material 21.
The base material 21 is a thin sheet-like member formed of a thermoplastic resin sheet such as PET (polyethylene terephthalate), for example, similarly to the base material 11 of the first embodiment.
The RFID inlet 27 can satisfy its function as long as the IC chip 22 and the antenna 25 are provided on the base 21. However, in this embodiment, in order to protect the IC chip 22 and the antenna 25, as in the information recording medium 10 of the first embodiment, an insulating film such as vinyl chloride resin, PET, or PET-G is laminated. In addition, a thin plate having a built-in auxiliary antenna 23 having a thickness of 0.4 mm is used.
The antenna 25 has a size of 15 mm × 30 mm and a winding number of 3 turns. In the figure, two turns are shown for easy viewing.

  The RFID inlet 27 is disposed so as to overlap the loop portion 23B. In the figure, the line of the antenna 25 and the line of the auxiliary antenna 23 are originally overlapped. However, in order to facilitate understanding, the RFID inlet 27 is illustrated in a small size so as not to overlap. Note that the RFID inlet 27 may be arranged so that the antenna lines do not overlap as shown.

When the wristband 200 of the second embodiment is held over the reader / writer RW, a current is generated in the auxiliary antenna 23 by the magnetic lines of force from the reader / writer RW. Then, magnetic lines of force are generated in the loop portion 23B by the current generated in the auxiliary antenna 23. The RFID inlet 27 receives a magnetic line of force generated in the loop portion 23B, generates a current in the antenna 25, and the IC chip 22 operates.
Here, since the auxiliary antenna 23 is configured by combining loop portions having different winding directions in the same manner as the antenna 13 of the first embodiment, the wristband 200 of the second embodiment is also the list of the first embodiment. An effect similar to that of the band 100 can be obtained.
Further, the RFID inlet 27 and the auxiliary antenna 23 are separately manufactured and combined. Therefore, for example, since the RFID inlet 27 includes the IC chip 22, the auxiliary antenna 23 is included when the band body 201 is manufactured by a relatively low temperature manufacturing process and processed at a high temperature such as injection molding. It becomes possible to do. In this way, the method for manufacturing the wristband 200 can be selected more flexibly.

(Modified form of the second embodiment)
FIG. 15 is a diagram showing a modification of the second embodiment.
As shown in FIG. 15, the RFID inlet 27 may be inserted into the band main body 201 later and used. For example, the band main body 201 is provided with a pocket-shaped holding portion 201c into which the RFID inlet 27 can be inserted.
With such a configuration, it is possible to use the band body 201 such that the band body 201 can be freely exchanged according to fashion. Since important authentication information and the like are recorded in the RFID inlet 27, the same information can always be used even if the band main body 201 is replaced. Moreover, since the band main body 201 only includes the auxiliary antenna 23, it can be manufactured at low cost. In addition, the form of the mounting body corresponding to the band main body 201 can be changed as appropriate. For example, instead of the wrist band body 201, a mounting body that can be mounted on the second arm may be prepared, or a small mounting body for a child may be prepared. The RFID inlet 27 is attached to any mounting body. It becomes possible to share.

(Third embodiment)
FIG. 16 is a diagram illustrating a wristband 300 according to the third embodiment.
The wristband 300 of the third embodiment has the same form as the wristband 100 of the first embodiment, except that the information recording medium 30 is different from the information recording medium 10 of the first embodiment. Therefore, portions having the same functions as those in the first embodiment described above are denoted by the same reference numerals at the end, and redundant description is appropriately omitted.
The information recording medium 30 of the third embodiment includes a display unit 38 connected to the IC chip 32.
The display unit 28 is a so-called rewritable electronic paper that requires electric power at the time of rewriting but can continue displaying information even if no power is supplied after the rewriting.

In the conventional information recording medium of the wristband type, the power that can be supplied is small and unstable, and therefore it is impossible to provide a rewritable display section.
However, in the present embodiment, since the antenna 33 similar to the antenna 13 of the first embodiment is provided, the obtained power is large and the power necessary for rewriting the display unit 28 can be supplied.
Therefore, information obtained through non-contact communication and update information (for example, electronic money balance) can be displayed on the display unit 28, and convenience can be further improved.

(Deformation)
The present invention is not limited to the embodiment described above, and various modifications and changes are possible, and these are also within the scope of the present invention.

(1) FIG. 17 is a diagram showing a modified embodiment related to the antenna arrangement.
In the information recording medium 40 shown in FIG. 17, the loop portion 43A of the antenna 43 connected to the IC chip 42 is formed clockwise, and the adjacent loop portion 43B is also formed clockwise. The loop portion 43C is formed counterclockwise. Thus, the combination of clockwise and counterclockwise can be appropriately changed according to the usage mode.

(2) Also, the number of loop portions of the antenna is not limited to three and can be changed as appropriate.
FIG. 18 is a diagram illustrating an example of a wristband in which the number of loop portions of the antenna is changed in the same manner as FIG.
For example, as shown in FIG. 18, the four loop portions may be arranged substantially equally except for the vicinity of the fastener.

(3) Moreover, the form of the wristband which does not have a fastener may be sufficient.
FIG. 19 is a diagram illustrating an example of a wristband not provided with a fastener in the same manner as FIG.
For example, as shown in FIG. 19, since there is no fastener, the antenna may be disposed over substantially the entire wristband. The example of FIG. 19 shows an example in which two loop portions are arranged. This arrangement can also be changed as appropriate.
FIG. 20 is a view showing another example of a wristband not provided with a fastener in the same manner as FIG.
In the example of FIG. 20, the example which has arrange | positioned four loop parts substantially equally is shown.

(4) Furthermore, it may be in the form of a wristband that is not provided with a fastener and is configured in a substantially C shape with a part cut away.
FIG. 21 is a diagram showing an example of a wristband configured in a substantially C shape with a part cut away, in the same manner as FIG.
In the example of FIG. 21, a configuration example in which three loop portions are arranged is shown as in the first embodiment. Note that the number and arrangement of the loop portions can be appropriately changed as in the above-described example.

(5) In the first embodiment, the example in which the fastener that holds the form of the band main body 101 in an annular shape by the through hole 101a and the engagement protrusion 101b has been described. For example, a buckle provided on a wristwatch band may be used, and the form thereof may be any.

(6) In each embodiment, as an antenna formation method, an example using a coated copper wire antenna has been described. Not limited to this, for example, a copper or aluminum thin film layer may be formed into an antenna shape by etching, may be formed by printing with conductive ink, may be formed by plating, etc. Any method may be used.

(7) In each embodiment and modification, it has been described that the number of loop portions of the antenna can be changed as appropriate. The number of loop portions is not limited as long as it is two or more, but three or four is most desirable as a wristband form.

(6) In each embodiment, functions as an information terminal such as other clock functions and health information recording / display functions may be added as appropriate.

(7) In the second embodiment, the RFID inlet 27 has been described with an example in which the RFID inlet 27 is disposed so as to overlap the loop portion 23B of the auxiliary antenna 23. For example, the RFID inlet 27 may be overlapped with the loop portion 23A or the loop portion 23C.

(8) In the third embodiment, the mode in which the display unit 38 is added to the information recording medium 10 of the first embodiment has been described as an example. For example, the display unit may be added to the RFID inlet 27 of the second embodiment.

  Each embodiment and modification may be used in appropriate combination, but detailed description is omitted. Further, the present invention is not limited by the embodiments described above.

DESCRIPTION OF SYMBOLS 10 Information recording medium 11 Base material 12 IC chip 12a Antenna connection terminal 12b Antenna connection terminal 13 Antenna 13A Loop part 13Aa Opening part 13B Loop part 13Ba Opening part 13C Loop part 13Ca Opening part 20 Information recording medium 21 Base material 22 IC chip 22a Antenna Connection terminal 22b Antenna connection terminal 23 Auxiliary antenna 23A Loop part 23Aa Opening part 23B Loop part 23Ba Opening part 23C Loop part 23Ca Opening part 24 Auxiliary antenna sheet 25 Antenna 26 Antenna base material 27 RFID inlet 28 Display part 30 Information recording medium 32 IC chip 33 Antenna 38 Display unit 40 Information recording medium 42 IC chip 43 Antenna 43A Loop unit 43B Loop unit 43C Loop unit 100 Wristband 101 Band body 101a Through hole 101b Engagement Protrusion 200 Wristband 201 Band body 201c Holding unit 300 Wristband

Claims (8)

An antenna,
An IC chip that performs non-contact communication via the antenna;
An information recording medium comprising:
The antenna is continuously connected from one end to the other end,
The antenna includes a plurality of loop portions each forming a loop of one turn or more,
At least one of the plurality of loop portions is an information recording medium having a winding direction different from that of the other loop portions. The information recording medium according to claim 1,
In use, the information recording medium is used in a state where the antenna is curved so as to form a part of an annular shape when the formation surface of the antenna is viewed from the side.
At least one of the plurality of loop portions is arranged so as to occupy a range of a length of ± 20% of a half circumference of an annular shape formed by the antenna in the use state;
An information recording medium characterized by the above. In the information recording medium according to claim 1 or 2,
Providing a display unit capable of rewriting and displaying information;
An information recording medium characterized by the above. An information recording medium according to any one of claims 1 to 3, comprising:
At least in a wearing state, it is in a curved state so as to constitute a part of an annular shape, and a band body that is worn against a human body or an object,
Wearing body comprising. An antenna,
An IC chip that performs non-contact communication via the antenna;
An auxiliary antenna used in a non-contact state with respect to the antenna of the information recording medium comprising:
The auxiliary antenna is connected continuously from a certain position on the conductor until it returns to the original starting point by following the path of the conductor from the starting point,
The auxiliary antenna includes a plurality of loop portions each forming a loop of one turn or more,
At least one of the plurality of loop portions is an auxiliary antenna having a winding direction different from that of the other loop portions. The auxiliary antenna according to claim 5, wherein
In use, the auxiliary antenna is used in a curved state so as to form a part of a ring shape when the formation surface of the auxiliary antenna is viewed from the side.
At least one of the plurality of loop portions is disposed so as to occupy a range of a length of ± 20% of the length of an annular shape formed by the auxiliary antenna in the use state;
Auxiliary antenna characterized by. An information recording medium used together with the auxiliary antenna according to claim 5 or 6,
Providing a display unit capable of rewriting and displaying information;
An information recording medium characterized by the above. An auxiliary antenna according to claim 5 or claim 6 is provided,
At least in a wearing state, it is in a curved state so as to constitute a part of a ring shape, and a band body that is worn on a human body or an object,
Wearing body comprising.

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