JPH08330838A - Antenna for short-range communication and its manufacture - Google Patents

Abstract

PURPOSE: To realize communication without being restricted by the direction of a non-contact information card at the time of reception in the short-range communication antenna of a card reader/writer. CONSTITUTION: In this short-range communication antenna of a card reader/ writer-side, which transmits or transmits/receives an information signal by electromagnetic guide between the card reader/writer and the non-contact information card, the short-range communication antenna is constituted by a loop antenna. The loop antenna is folded back so that an antenna conductor 42 is crossed and backward current (i) is set to flow in adjacent loop coils 43A and 43B.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a short-range communication antenna on the card reader / writer side for transmitting or receiving an information signal between a card reader / writer and a contactless information card, and a method for manufacturing the same. More specifically, the present invention relates to a short-range communication antenna that enables a non-contact information card to efficiently receive a magnetic field accompanied by an information signal in a communication area regardless of its orientation, and a manufacturing method thereof.

[0002]

2. Description of the Related Art Recently, IC card systems, especially contactless information card systems for transmitting and receiving information in a contactless manner,
For example, it has become a hot topic in the fields of automatic ticket gates and entrance / exit management systems.

The contactless information card system mainly comprises a card reader / writer which is an interrogator and a contactless information card which is a responder. Then, a magnetic flux accompanied by an information signal is generated from the communication antenna provided in the card reader / writer, and the magnetic flux links a coil on the non-contact information card side (so-called antenna coil) to cause electromagnetic induction. A voltage is generated in the coil to operate the IC. A loop antenna is usually used as the communication antenna provided in the card reader / writer.

FIG. 18 shows an example of a contactless information card system.
Shown in In FIG. 18, reference numeral 1 denotes a card reader / writer, and 2 denotes a contactless information card for transmitting / receiving information signals to / from the card reader / writer 1 by electromagnetic induction. In the card reader / writer 1, 10 is a main control unit composed of a CPU (central processing unit), 11 is a higher-level interface control circuit, and P / P which converts a digital signal of transmission information from the main control unit 10 into a parallel-serial format. Digital modulation is performed via the S conversion circuit 12, for example, ASK (Amplitude Sh
ift Keying) modulation or FSK (Frequency Shift Keyi)
ng) The modulated wave is supplied to the digital modulation / amplification circuit 13 that amplifies the signal, and the modulated wave obtained at the output side of the digital modulation / amplification circuit 13 is supplied to the transmission antenna 14. Reference numeral 15 is a carrier wave oscillator which oscillates a carrier wave signal having a frequency of several hundred kHz.

Reference numeral 16 denotes a receiving antenna of the card reader / writer, which supplies the digitally modulated wave obtained by the receiving antenna 16 to an amplifying / demodulating circuit 17 which amplifies and demodulates it, and outputs it to the output side of the amplifying / demodulating circuit 17. The demodulated digital signal is supplied to the main control unit 10 via the S / P conversion circuit 18 that performs serial-parallel conversion.

In the contactless information card 2, 20
Indicates a receiving antenna that receives the modulated wave from the transmitting antenna 14 by electromagnetic induction. With this electromagnetic induction, several hundreds
Taking the case of transmitting and receiving a carrier wave modulated wave of kHz as an example, due to the change of the magnetic field generated in the vicinity of the transmission antenna 14 by the radio frequency current of several 100 kHz supplied to the transmission antenna 14 of the card reader / writer 1, Communication is performed by a signal induced in the receiving antenna 20 of the contactless information card 2.

A modulated wave obtained at the receiving antenna 20 is amplified and supplied to an amplification / demodulation circuit 21 for demodulation, for example, ASK demodulation or FSK demodulation, and a digital signal obtained at the output side of the amplification / demodulation circuit 21 is serial-parallel. A main control unit 2 including a CPU via an S / P conversion circuit 22 for conversion
Supply 3

In the main controller 23, it is judged whether the information based on the digital signal is a read command signal, a write command signal, write information, etc., and the data memory 2
By supplying a predetermined signal to the memory 4, the main controller 23 issues a write command to the data memory 24 and a read command.

Further, the digital signal which is the information signal read from the data memory 24 is supplied to the main control section 23, and the digital signal which is the information signal read from the main control section 23 is converted from parallel to serial P / P. Through the S conversion circuit 25, digital modulation, for example ASK modulation,
It is supplied to a digital modulation / amplification circuit 26 that amplifies the signal, and the modulated wave obtained at the output side of the digital modulation / amplification circuit 26 receives the reception antenna 1 of the card reader / writer 1.
6, the modulated wave is supplied to the transmitting antenna 27 which transmits by electromagnetic induction. 28 is a carrier wave oscillator which oscillates a carrier wave signal having a frequency of several 100 kHz.

Since the conventional non-contact information card system is constructed as described above, when writing information to the non-contact information card, the write command signal and the write information signal are first controlled by the main control of the card reader / writer 1. Digital modulation / amplification circuit 1 from section 10 through P / S conversion circuit 12
3 and is modulated and supplied to the transmitting antenna 14.

The same signal as the signal supplied to the transmitting antenna 14 is induced by the electromagnetic induction in the receiving antenna 20 of the contactless information card 2, and the induced signal is amplified and demodulated by the contactless information card 2. Is demodulated into a digital signal which is an information signal, and the demodulated digital signal is serial-parallel converted by the S / P conversion circuit 22 and supplied to the main controller 23.

The main control unit 23 discriminates the transmitted digital signal from the write command signal and the write information signal, and writes and stores the write information signal in the data memory 24.

When the specified information is read from the data memory 24 of the contactless information card 2, the card reader / writer 1 outputs a digital modulation signal to the contactless information card 2 as in the case of the above-described writing operation. A digital read command signal is transmitted.

The main control section 23 of the contactless information card 2 detects the read command transmitted from the card reader / writer 1, reads the specified information from the area of the data memory 24 specified by this command, and reads the specified information. The digital signal which is the read information signal is converted into the P / S conversion circuit 2
Digital modulation / amplification circuit 2 by converting into serial signal at 5
6, the modulated signal of this information signal is obtained, and this digital modulated signal is transmitted to the receiving antenna 16 of the card reader / writer 1 by electromagnetic induction via the transmitting antenna 27.

The modulated signal transmitted to the receiving antenna 16 is converted into a digital signal which is an information signal in the amplification / demodulation circuit 17, and the digital signal which is the information signal is S / P.
The conversion circuit 18 converts the signal into a parallel signal to obtain an original digital signal information signal, which is supplied to the main controller 10.

The transmitting antenna 14 and the receiving antenna 16 in the card reader / writer 1 shown in FIG. 18 can be constituted by one communication antenna that also serves as transmission and reception. Further, the reception antenna 20 and the transmission antenna 27 in the contactless information card 2 can also be configured by one communication antenna that also serves as transmission and reception.

[0017]

By the way, in the loop antenna which is the communication antenna of the card reader / writer, the magnetic flux 32 generated by the loop antenna 31 is generated so as to surround the loop, as shown in FIG.
Therefore, if the non-contact information card 33 is held in parallel with the loop antenna 31 as shown in FIG. 17A, the efficiency of power transfer between the card reader / writer and the non-contact information card is the best, but it is always It is almost impossible to communicate with the communication antenna at such a position. For example, as shown in FIG. 17B, when the contactless information card 33 is vertically supported by the loop antenna, the power efficiency is drastically reduced. It is possible to raise the level of the magnetic field generated from the communication antenna, but this is not preferable due to the influence on nearby equipment and legal restrictions.

There is no conventional technique for solving such a problem, and a new technique which is not limited to the direction in which the contactless information card 33 is held at the time of reception has been desired.

In view of the above points, the present invention provides a short-range communication antenna and a method for manufacturing the same, which are capable of efficiently transmitting power without being restricted by the direction in which the contactless information card is held during reception. It is provided.

[0020]

A near field communication antenna according to a first aspect of the present invention is a card reader adapted to transmit or receive an information signal between a card reader / writer and a contactless information card by electromagnetic induction. In the near field communication antenna on the writer side, this near field communication antenna is configured by a loop antenna, and the loop antenna is folded back so that the antenna conductors intersect with each other so that a reverse current flows in an adjacent loop coil. The configuration.

In the method for manufacturing a short-range communication antenna according to the second aspect of the present invention, the antenna conductor is reciprocally wound around a plurality of bobbins fixed at predetermined intervals while alternately passing the antenna conductors between the bobbins. The near field communication antenna of the first invention is manufactured.

A method for manufacturing a short-range communication antenna according to a third aspect of the present invention is the method for manufacturing a short-range communication antenna according to the second aspect, wherein the bobbin is fixed to a work table capable of reciprocating motion, and an antenna conductor is provided. An antenna conductor is wound by an arm equipped with an antenna conductor supply head capable of reciprocating motion.

The short-range communication antenna according to the fourth aspect of the present invention is a short-range communication on the side of a card reader / writer that transmits or receives an information signal by electromagnetic induction between the card reader / writer and the contactless information card. In the antenna for antenna, an antenna conductor, or an antenna conductor and a strip for adjustment is a conductor pattern formed on an insulating substrate,
A loop coil is composed of conductor patterns formed on both surfaces of the insulating substrate and connected to each other through a through hole or the like, and a current flows in the opposite direction to an adjacent loop coil.

The short-range communication antenna according to the fifth aspect of the present invention is the short-range communication antenna of the fourth aspect, wherein the antenna conductor or the antenna conductor and the adjusting strip is formed by chemical etching. .

[0025]

In the near field communication antenna according to the first aspect of the present invention, the loop antenna is folded back in a loop shape so as to intersect the antenna conductors, and the current flows in the opposite direction to the adjacent loop coil. , The magnetic flux generated from one loop coil returns to another adjacent loop coil, so that the magnetic flux is closed at a portion corresponding to the adjacent loop coil. Therefore, the magnetic flux density at that portion is high and a sufficient induced voltage can be generated in the non-contact information card by electromagnetic induction.

Further, since the magnetic flux is closed, the contactless information card can be held in the direction in which it is held over the antenna, and therefore communication can be ensured without worrying about its inclination.

In the method for manufacturing a short-range communication antenna according to the second aspect of the present invention, the antenna conductor is reciprocally wound around a plurality of bobbins fixed at predetermined intervals while alternately passing between the bobbins. By forming the antenna in a loop shape, it is possible to accurately manufacture the short-range communication antenna of the first invention having adjacent loop coils whose current directions are opposite to each other, and obtain a stable communication area. .

In the method for manufacturing a near field communication antenna according to a third aspect of the present invention, in the second aspect of the present invention, the bobbin is fixed to a work table capable of reciprocating motion, and the antenna conductor capable of reciprocating motion is supplied. By winding the antenna conductor with the arm having the supply head, the short-range communication antenna of the first invention can be manufactured by the automatic winding machine.

In the near field communication antenna according to the fourth aspect of the present invention, the antenna conductor, or the antenna conductor and the adjusting strip are formed by a conductor pattern formed on an insulating substrate, and are formed on both sides of the insulating substrate. A loop coil is configured by the conductor pattern connected through the through hole, and the magnetic flux generated from one loop coil is adjacent to the other loop coil because the current flows in the opposite direction to the adjacent loop coil. As described above, the magnetic flux is closed at the portions corresponding to the adjacent loop coils. Therefore, the magnetic flux density in that portion is high and a sufficient induced voltage can be generated in the non-contact information card by electromagnetic induction. Further, since the magnetic flux is closed, the contactless information card can be held in the direction in which it is held over the antenna, and therefore communication can be ensured without worrying about the inclination.

When forming the adjusting strip, it is possible to correct the influence on the equipment around the antenna and the manufacturing variation of the antenna conductor.

Since the loop coil is formed by the conductor patterns formed on both surfaces of the insulating substrate in the present invention, the short-range communication antenna can be manufactured with high precision and compactness, and the short-range communication antenna can be easily arranged. Can be

In the near field communication antenna according to the fifth aspect of the present invention, in the near field communication antenna according to the fourth aspect of the invention, the antenna conductor, or the antenna conductor and the adjusting strip are formed by chemical etching. A highly accurate short-range communication antenna can be obtained.

[0033]

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

1 and 2 show an embodiment of a short-range communication antenna according to the present invention which is a communication antenna of a card reader / writer, that is, a transmission antenna or a transmission / reception antenna. The short-range communication antenna 41 of this example is formed by folding the antenna conductors 42 in a loop shape so as to intersect in the middle, that is, winding them in a figure 8 shape in plan view, and the directions of the currents i are opposite to each other. Two loop coils 43A and 43B are formed adjacent to each other, and feeding terminals 44A and 44B are led out from both ends of the antenna conductor 42.

In the near field communication antenna 41, currents flowing in opposite directions to each other flow through the two loop coils 43A and 43B, so that the magnetic flux 45 generated from one loop coil 43A is adjacent to each other, as shown in FIG. By returning to the other loop coil 43B, the magnetic flux 45 is closed at the portions 46 and 47 corresponding to the adjacent loop coils 43A and 43B. Further, magnetic fluxes from the left and right loop coils 43A and 43B are added. Therefore, the magnetic flux density of the portions 46 and 47 becomes high, and a sufficient induced voltage can be generated in the non-contact information card 33 by electromagnetic induction.

Further, at the time of communication, the non-contact information card 33 moves while holding it over the antenna 41, but since the magnetic flux 45 of the antenna 41 is closed, the direction in which the non-contact information card 33 is held, and therefore its inclination, is important. Communication can be ensured without

That is, when the contactless information card 33 is vertically supported on the plane of the loop antenna 41, which is an antenna for short-range communication, as shown by the solid line in FIG. 3, or as shown by the chain line, the contactless information card 33 is provided. It is possible to surely communicate with any of the cases where the card 33 is held in parallel with the plane of the loop antenna 41. That is, in this embodiment, the power transmission efficiency is improved as compared with the antenna with one loop coil regardless of the inclination angle of the non-contact information card 33 with respect to the loop antenna 41.

When communication is performed using the portions 46 and 47 of the near field communication antenna 41 shown in FIG. 3 where the magnetic flux 45 is closed, if the magnetic field 45 of these portions 46 and 47 is suppressed to the necessary minimum, the antenna end Magnetic field 45a of the part 48 corresponding to the part
Can be further weakened, and interference with adjacent equipment can be reduced.

In this near field communication antenna 41, the operation area of the non-contact information card 33 can be limited to only the areas of the portions 46 and 47 corresponding to the adjacent loop coils.

FIGS. 4 and 5 show another embodiment of the near field communication antenna according to the present invention. The short-range communication antenna 51 of this example has the antenna conductor 42 wound in a figure 8 shape in the same manner as in FIG. 1 in plan view to form two adjacent loop coils 43A and 43B, and in particular, the loop coil 43A. And 43B to both loop coils 43A and 43
The angle θ formed by B is bent to be smaller than 180 °.

In this way, when the two loop coils 43A and 43B are bent and configured, since the directivity has directivity, the operating area of the non-contact information card 33 can be narrowed and the antenna installation space can be further reduced. Can be made smaller.

FIG. 6 shows another embodiment of the near field communication antenna according to the present invention. Near field communication antenna 5 of this example
The antenna conductor 3 is formed by winding one antenna conductor 42 while intersecting it, and connecting three or more, in this example, three loop coils 54A, 54B and 54C in which the directions of the currents are opposite to each other. Power supply terminal 44 from both ends of 42
A and 44B are derived and constructed.

In the near field communication antenna 53, the magnetic flux generated from the central loop coil 54B returns to the adjacent loop coils 54A and 54C on both sides, so that the adjacent loop coils 54A and 54C are adjacent to each other.
The magnetic flux is closed between B and between the loop coils 54B and 54C in the areas corresponding to the intersections of the antenna conductors 42, respectively, and as a result, the area of high magnetic flux density is widened and the non-contact information card 33 has a larger area. The operating area can be extended by any distance. That is, the operating area can be expanded.

At this time, while the loop coils 54A and 54C are each wound once, only the loop coil 54B is wound twice, and the loop coil 54A: loop coil 54B: loop coil 5 is wound.
The number of turns of 4C can be set to 1: 2: 1.

As described above, the operation area of the non-contact information card 33 can be freely set by selecting each of the above-mentioned embodiments.

7 and 8 show another embodiment of the near field communication antenna according to the present invention. In the near field communication antenna 56 of this example, an inverted S-shaped conductor pattern 59 that serves as an antenna conductor is formed on the upper surface 57a of the insulating substrate 57, and an inverted S-shaped conductor pattern 59 of the upper surface 57a is formed on the lower surface 57b. An S-shaped conductor pattern 60 serving as an antenna conductor is formed so as to intersect in the middle, and one ends of the conductor patterns 59 and 60 are connected to each other through a through hole 61. Conductor 59
And 60, two adjacent loop coils 62A and 6A in which the directions of the current i are opposite to each other in plan view.
2B is formed, and the feeding terminals 64A and 64B are formed by the conductor pattern.

Also in this short-range communication antenna 56, adjacent loop coils 62A and 62 are provided as in FIG.
Since the direction of the current i flowing through B is reversed, the magnetic flux generated from one loop coil 62A is transferred to the other loop coil 6A.
Returning to 2B, the magnetic flux will be closed. Therefore, as in the case of FIG. 1, a sufficient induced voltage can be generated in the non-contact information card 33, and communication can be ensured regardless of the inclination of the non-contact information card 33.

FIG. 9 shows another embodiment of the near field communication antenna according to the present invention. This short-range communication antenna 66
Is a top surface 57 of the insulating substrate 57 in the configuration of FIG.
An adjustment strip (metal foil piece) 67 is formed on a together with the conductor patterns, that is, the antenna conductors 59 and 60.

This near field communication antenna 66 has the same effect as that of FIG.
Therefore, it has the effect of correcting the influence on the devices around the antenna and the manufacturing variation of the antenna conductors 59 and 60. The adjustment can be easily performed by appropriately peeling off the adjusting strip 67.

The antenna conductors 59 and 60 shown in FIGS. 7 and 9,
Alternatively, the adjustment strip 67 can be formed by chemically selective etching a conductive foil or conductive layer applied to the insulating substrate 57. According to the near field communication antennas 56 and 66, the position and size of the antenna conductors 59 and 60 or the adjustment strip 67 can be accurately obtained by chemical etching, so that the loops of the same size can be obtained. A large number of coils 62A and 62B can be formed at predetermined positions, which is suitable for mass production.

Further, in the near field communication antenna 56, the loop coil 62A, the conductor patterns 59, 60 formed on both surfaces 57a, 57b of the insulating substrate 57 are used.
Since 62B is formed, it is possible to manufacture with high precision and compactness, and it is possible to facilitate the arrangement of the near field communication antenna.

Although the two loop coils 62A and 62B are formed in FIGS. 7 and 9 described above, it is also possible to adopt a structure in which three or more loop coils are formed.

Loop coils 43A, 43B, 54 of the above example
The shape of A, 54B, 54C, 62A, 62B is, for example, a perfect circle when viewed two-dimensionally, but is not limited to this, and may be a horizontally long ellipse, a square, or the like. Further, the antenna conductor 42 in FIGS. 1, 4, and 6 is a linear antenna wire, and it is possible to provide multiple turns in the thickness direction of the antenna.

Next, a method for manufacturing the short-range communication antenna of the present invention will be described.

As shown in FIG. 10, 1 is formed on the common substrate 71.
A winding device 74 is prepared in which a pair of winding frames 72 and 73 are arranged to face each other with a predetermined interval. The antenna conductor wire is manually wound around the pair of winding frames 72 and 73 of the winding device 74 in, for example, an S shape. That is, the left winding frame 72 is wound left and the right winding frame 73 is wound right by alternately changing the winding direction.

By using such a winding device 74, for example, the short-range communication antenna 41 of the present invention shown in FIG. 1 can be easily manufactured by hand.

In order to reduce the overlapping frequency at the left and right intersections, for example, the left reel 72 may be provided a plurality of times (eg, twice or more).
Alternatively, the target short-range communication antenna may be manufactured by winding after winding in a unit of, and inverting and winding the same number of times around the right winding frame 73.

As another manufacturing method of the present invention, the automatic winding machine shown in FIGS. 11 and 12 can be used. In this example, as shown in the figure, the winding device 74 of FIG. 10 is mounted on a work table 76 so as to be capable of reciprocating in one direction, and an antenna conductor supply head (so-called winding) is mounted on the work table 76. Swivel arm 78 having line head 77
The automatic winding machine 79 attached with is used. The rotating arm 78 rotates about a shaft 79 so as to reciprocate in a direction b intersecting the reciprocating direction a of the winding device 74, for example, a direction b orthogonal thereto. The antenna conductor 42 is fed along the turning arm 78 and is fed to the antenna conductor feeding head 77 at the tip.

In this automatic winding machine 79, while the winding device 74 is linearly reciprocated, the rotary arm 78 is rotated so as to reciprocate about the shaft 79, whereby the above-described manual winding is performed. Similarly to the above, the antenna conductor 42 is wound around the winding frames 72 and 73 of the winding device 74 in an S shape, and the short range communication antenna 41 of the present invention, for example, shown in FIG. 1 is formed of two loop coils 43A and 43B. It is made. Of course, multiple unit winding is also possible.

FIG. 13 shows an antenna conductor supply head 77.
Shows the operation order of. The order of operation of the head 77 and its position are shown by (1) to (8). In the column (A), the winding device 7
4 shows the position of the head 77 in the order of movement by left and right movement in the direction a, and column (B) shows the position of the head 77 in the order of movement by the rotational displacement of the rotating arm 78 in the direction b. In either case, when they are distant with respect to the horizontal axis direction (for example, (1) and (2) in the (A) column, (2) and (3) in the (B) column, the amount of movement or rotational displacement is large, and they are arranged side by side. (Eg, (2) and (3) in the (A) column, (1) and (2) in the (B) column indicate that the amount of movement or rotational displacement is small.

The short-range communication antenna 41 of FIG. 1 is manufactured by reciprocating the winding device 74 and the rotating arm 78 so as to follow the procedure of FIG.

The operations of the columns (A) and (B) are changed, and the left and right reels 7 are formed in the same manner as described in the manual winding.
It is also possible to wind it in units of 2, 73 a plurality of times so as to reduce the frequency of overlapping at intersections.

In the automatic winding machine 79 shown in FIGS. 11 and 12, if a linear stepping motor or the like is used as the power source for the winding device 74 and the rotating arm 78, a simple and inexpensive device will be used. It is easy to switch between loop coils having different winding forms in one-turn or two-turn units, which is extremely economical.

14 and 15 show an example of a method for manufacturing a near field communication antenna composed of three loop coils. FIG.
As shown in FIG. 4, three winding frames 82, 8 are formed on the common substrate 81.
A winding device 85 is prepared by arranging 3, 84 in a line at a predetermined interval from each other. This winding device 85 is installed in the automatic winding machine 79 shown in FIGS. 11 and 12 in place of the winding device 74. Then, the antenna conductor supply head 7 shown in FIG.
7 operating positions (i) to (ho) and their operating order (1) to
By reciprocating the winding device 85 and the rotating arm 78 along (12), for example, the near field communication antenna 53 of the present invention shown in FIG. 6 can be manufactured. FIG.
The table shown in FIG. 11 uses the same description method as the table shown in FIG.

In the case of the table shown in FIG. 15, the reels 82, 83,
The number of turns wound around 84 is 1: 1: 1. However, if the operation sequence (1) to (4) is repeated twice, the number of turns of the central loop coil among the three created loop coils is left and right. It is twice the number of turns of the loop coil. In this way, the amount of magnetic flux generated can be balanced.

[0066]

According to the antenna for near field communication of the present invention, a plurality of loop coils are formed,
A closed portion of the magnetic flux is formed, and the magnetic flux density of that portion is a residual effect of the magnetic flux from the adjacent loop coil,
It becomes higher, sufficient communication is possible, and a magnetic field accompanied by an information signal can be efficiently received regardless of the orientation (tilt) of the non-contact information card at the time of reception. Therefore, the orientation of the non-contact information card can be freely selected with respect to the communication antenna of the card reader / writer.

Further, it becomes possible to set the communicable range during the operation of the IC card system to a required area, and it is possible to reduce the interference to the adjacent equipment.

According to the method for manufacturing a short-range communication antenna of the present invention, it is possible to accurately manufacture a short-range communication antenna composed of a plurality of loop coils that intersect the antenna conductors and the currents flow in opposite directions. You can

[Brief description of drawings]

FIG. 1 is a plan view showing an embodiment of a near field communication antenna of the present invention.

FIG. 2 is a cross-sectional view of the near field communication antenna of FIG.

FIG. 3 is an explanatory diagram showing a state of magnetic flux of the near field communication antenna according to the present invention.

FIG. 4 is a plan view showing another embodiment of the near field communication antenna according to the present invention.

5 is a cross-sectional view of the short-range communication antenna of FIG.

FIG. 6 is a plan view showing another embodiment of the near field communication antenna according to the present invention.

FIG. 7 is a plan view showing another embodiment of the near field communication antenna according to the present invention.

8 is a perspective view of the near field communication antenna of FIG. 7. FIG.

FIG. 9 is a plan view showing another embodiment of the near field communication antenna according to the present invention.

10A is a plan view showing an example of a winding device used for manufacturing the antenna for short-range communication of the present invention. FIG. B is a front view showing an example of a winding device used for manufacturing the near field communication antenna of the present invention. FIG. C is a side view showing an example of a winding device used for manufacturing the short-range communication antenna of the present invention.

FIG. 11 is a front view of an automatic winding machine used for manufacturing the short-range communication antenna of the present invention.

12 is a plan view of the automatic winding machine of FIG. 11. FIG.

13 is a table showing an operation sequence of a winding head by an automatic winding machine incorporating the winding device of FIG.

FIG. 14 A A plan view showing another example of the winding device used for manufacturing the antenna for short-range communication of the present invention. B is a front view showing another example of the winding device used for manufacturing the near field communication antenna of the present invention. FIG. C is a side view showing another example of the winding device used for manufacturing the short-range communication antenna of the present invention.

15 is a table showing an operation sequence of a winding head by an automatic winding machine incorporating the winding device shown in FIG.

FIG. 16 is an explanatory diagram showing a state of magnetic flux of a conventional loop antenna.

FIG. 17 is an explanatory diagram showing a relationship between a non-contact information card horizontally supported by a conventional loop antenna and magnetic flux. B is an explanatory diagram showing a relationship between a non-contact information card vertically extending over a conventional loop antenna and magnetic flux.

FIG. 18 is a configuration diagram showing an example of an information card system.

[Explanation of symbols]

1 Card Reader / Writer 2,33 Non-contact Information Card 41,53,56,66 Near Field Communication Antenna 42,59,60 Antenna Conductor 43A, 43B, 54A, 54B, 54C, 62A, 6
2B loop coil i current 44A, 44B power supply terminal 45 magnetic flux 57 insulating substrate 74,85 winding device 72,73,82,83,84 winding frame 76 worktable 77 antenna conductor supply head 78 rotating arm 79 automatic winding machine

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Katsuhisa Orihara 18 Satsuki-cho, Kanuma City, Tochigi Prefecture Sony Chemicals Kanuma Plant

Claims (5)

[Claims] 1. A short-range communication antenna on the card reader-writer side, wherein an information signal is transmitted or received by electromagnetic induction between a card reader-writer and a non-contact information card. It consists of a loop antenna,
An antenna for short-range communication, wherein the loop antenna is folded back so as to cross the antenna conductors so that an opposite current flows in an adjacent loop coil. 2. The short-range communication antenna according to claim 1, wherein the antenna conductor is reciprocally wound around a plurality of bobbins fixed at predetermined intervals while alternately passing between the bobbins. Manufacturing method. 3. The bobbin is fixed to a work table capable of reciprocating motion, and the antenna conductor is wound by an arm having a reciprocating antenna conductor supplying head for supplying the antenna conductor. The method for manufacturing the near field communication antenna according to claim 2. 4. A short-range communication antenna on the card reader / writer side, wherein an information signal is transmitted or received by electromagnetic induction between the card reader / writer and the non-contact information card. The adjustment strip is a conductor pattern formed on the insulating substrate, and the loop pattern is formed on both surfaces of the insulating substrate and is connected to each other through a through hole or the like to form a loop coil. An antenna for short-distance communication, characterized in that a current flows in a direction. 5. The near field communication antenna according to claim 4, wherein the antenna conductor, or the antenna conductor and the adjusting strip are formed by chemical etching.