JP6183185B2 - Capacitive coupling switch pattern - Google Patents

Description

  The present invention relates to a reader / writer antenna for reading a non-contact IC card and an input device using a capacitive coupling method as an input method including the antenna.

RFID (Radio Frequency Identification) is an IC chip with an antenna that is processed into a tag or a label as a non-contact type automatic recognition technology that recognizes people and objects using radio waves. Is exchanged using a reader / writer that reads and writes information on the IC chip. Antennas for exchanging information are arranged on the IC chip side of the tag and label and on the reader / writer side for reading and writing information, and the magnetic field generated from the antenna on the reader / writer side in a non-contact manner is applied to the tag or label. The antenna on the side is captured, and the tag is supplied with electric power by the induced current obtained from the antenna on the tag or label side to transmit data between them. Therefore, the antenna has a looped coil shape so as to generate a magnetic field and cause an induced current to flow. Currently, non-contact IC cards use the same technology as RFID, and are included in a kind of RFID in a broad sense. Non-contact IC cards have various uses such as boarding cards, electronic money, employee ID cards and security locks, and RFID has come to be used in various fields.

  Further, as an input of a touch panel, a resistive film type touch switch is known in which a conductive thin film is pasted on both sides of a film and a place where electricity is conducted by touching both of them is known. At present, the resistive film type is most frequently used as a touch input device.

  Conventionally, when a touch switch is incorporated in an interface device having a reader / writer and an antenna of the non-contact IC card, the resistive film type touch switch (hereinafter referred to as a sheet) is generally used. When using the resistive film system, it is necessary to arrange a resistive film system sheet on the surface side of the touch panel. The resistive film sheet is exposed to the outside by being arranged on the surface side of the touch panel, and the finger directly touches the surface of the resistive film sheet, so that the sheet is easily damaged. For this reason, malfunction of the input of the switch is likely to occur, and the durability of the switch is deteriorated. When used outdoors, since the ultraviolet rays directly hit the resistive film type sheet, the sheet is deformed, discolored, deteriorated, etc., and the weather resistance is inferior.

  In addition, the resistive touch panel sheet must be placed on the surface of the touch panel, and it is necessary to provide an edge space around the touch area to hide the communication lines of the sheet. It is the present situation to receive.

  On the other hand, if a capacitive touch sheet is used for the interface device having the reader / writer of the non-contact IC card and the antenna, the touch sheet is arranged on the back surface side of the touch panel and the finger is touched on the front surface side of the touch panel. Therefore, the problems of durability, weather resistance, and edge space can be solved. As a technology of a conventional capacitive touch sheet, one described in Patent Document 1 can be cited.

  Conventionally, a touch switch is known as an input device using a capacitive coupling method. The capacitive coupling type touch switch includes a panel switch and a control board. The panel switch is usually an electrode film in which a silver paste or ITO (indium tin oxide) is printed as a switch electrode on the surface of a film (generally polyethylene terephthalate film: PET film). It is composed of an insulating base material such as acrylic, glass and resin bonded with an adhesive (double-sided tape, etc.).

When a finger or hand approaches the switch electrode, a parallel plate capacitor is formed between the switch electrode and the finger or hand, and capacitance is generated. This change in capacitance is converted to a frequency by a C / F conversion circuit (a circuit that converts capacitance C to frequency F) formed by a capacitor C and a resistor R, and the frequency is converted into an input capture function (number of frequencies). Is replaced with digital data, and the on / off state of the touch switch is determined by arithmetic processing. When there are a plurality of switch electrodes, the switch electrodes are selected by a switching circuit provided for each switch electrode.

  The touch switch using the capacitive coupling method uses a region that can be touched by a finger or hand as a switch electrode, and detects that the finger or hand approaches the switch electrode. It is a digital input device that detects.

As a conventional technique in which a capacitive touch sheet and RFID are combined, the one described in Patent Document 2 can be cited.

JP 2005/084982 A JP2011-2947

  Many capacitive touch sheets are arranged on the outer periphery of the touch sheet so that a closed loop circuit (hereinafter referred to as a ground line) connected to the ground surrounds the switch electrode. . As described above, the antenna of the non-contact IC card and the reader / writer has a looped coil shape so as to generate a magnetic field and flow an induced current. When the ground line and reader / writer antenna are laid out close to each other, an induced current that cancels out the magnetic field of the reader / writer antenna due to the magnetic field of the reader / writer antenna (referred to as this induced current). This is called a shielding current). This shielding current can be a factor that obstructs the magnetic flux including the data signal from the reader / writer antenna. For this reason, the actual situation is that the capacitive touch sheet, the non-contact IC card, and the reader / writer antenna are arranged in the same place and are hardly used for incorporation into a device.

Therefore, when an electrostatic capacitance type touch sheet is incorporated in a non-contact IC card reader / writer and an interface device having an antenna, the reader / writer antenna is arranged in a place where the shielding current of the ground line is not affected, At present, the capacitive touch sheet and the reader / writer antenna are used apart from each other. Therefore, the housing shape of the device becomes large and the design and structure have no design freedom. For this reason, the number of devices that are required to be reduced in size has increased recently, and it is difficult to deal with devices that are required to be reduced in size.

  Patent Document 2 is a technique in which the communication sensitivity of the RFID antenna is lowered due to the influence from the touch sheet side. After placing the touch sheet inside the RFID antenna, A structure for tilting the angle is described. In this structure, since the RFID antenna is arranged around the touch sheet, the RFID antenna is increased in size and the panel area of the housing of the device is increased. The depth dimension of the device casing is also increased. In particular, a liquid crystal panel and a touch sensor are stacked, and an edge space and a thickness for arranging the entire panel display unit are required, and a structure in which the degree of freedom in designing the housing shape of the device is likely to be lowered.

The present invention is an apparatus provided with a reader / writer for exchanging information via a non-contact IC card and a mutual antenna, and a capacitive coupling type switch, wherein the switch electrode region of the capacitive coupling type switch one or more devices, wherein the non-conductive portion is formed as a first aspect, arranged before the ground line surrounding the Kiseiden capacitive coupling type switches of the switch electrodes within the ground The present invention proposes a capacitive coupling type switch pattern in which at least one of the lines is a non-conductive portion .

In the present invention, when a capacitive touch sheet is incorporated in an interface device having a reader / writer and an antenna for a non-contact IC card, the switch electrode has at least one non-conductive portion in the area of the switch electrode. By forming the non-conductive portion for eliminating the closed loop in the ground line surrounding the switch electrode, it is possible to increase the distance at which data of the non-contact IC card can be read. .

Touch switch configuration diagram Touch switch operation diagram Non-contact IC card information reading chart Diagram Switch electrode and ground diagram Switch electrode (with non-conductive part) and ground diagram Switch electrode and ground wire (with non-conductive part) Switch electrode (with non-conductive part) and ground wire (with non-conductive part) Switch electrode geometry 1 Information reading structure of contactless IC card Mouth shape Rice field Square wave shape diagram Switch electrode shape dimensions 2 Mouth shape Rice field Square wave shape diagram Full face mouth shape diagram

  The configuration of a capacitive switch will be described with reference to FIG. The capacitive coupling type touch switch of the present invention includes a panel switch 1 and a control board 2. The panel switch 1 is usually made of silver paste or ITO (as a ground wire 4 surrounding the switch electrode 3 and the switch electrode 3 on the surface of a film (generally polyethylene terephthalate film: PET film is used)). Insulating materials such as acrylic 5 or glass and resin as an electrode film printed with indium tin oxide or the like, or as a ground wire 4 surrounding the switch electrode 3 and the switch electrode 3 on the surface of the glass epoxy substrate. It is composed of a substrate bonded with an adhesive 6 (double-sided tape or the like).

Capacitive switching operation will be described with reference to FIG. When a finger or hand 7 approaches the switch electrode 3, a parallel plate capacitor is formed between the switch electrode 3 and the finger or hand 7 and a capacitance 8 is generated. The change in the capacitance 8 is converted into a frequency by a C / F conversion circuit (a circuit that converts the capacitance C into a frequency F) formed by a capacitor C9 and a resistor R10, and the frequency is converted into an input capture 11 function (frequency). The function of counting the number of the touch switch is replaced with digital data, and the on / off state of the touch switch is determined by the arithmetic processing 12. When there are a plurality of switch electrodes 3, the switch electrode 3 is selected by switching circuit 13 provided for each switch electrode 3.
To do.

Information reading of the non-contact IC card 14 will be described with reference to FIG. The contactless IC card 14 includes an IC chip 15 that holds information and controls information wirelessly, and an antenna 16 that communicates. The reader / writer 17 communicates with the contactless IC card 14 wirelessly. It is comprised from the antenna 16 for performing control, and the control board 18 for performing control. The non-contact IC card 14 has an IC chip 15, and information on the IC chip 15 is performed using a reader / writer 17 that can read and write. The antennas 16 for exchanging information are respectively arranged in the non-contact IC card 14 and the reader / writer 17, and a magnetic field 19 generated from the antenna 16 in the reader / writer 17 is applied to the antenna 16 in the non-contact IC card 14. Therefore, power is supplied to the IC chip 15 by the induced current 20 obtained by the antenna 16 in the non-contact IC card 14 and data is transmitted and received between them. Therefore, the antenna 16 has a looped coil shape so as to generate a magnetic field 19 and to cause an induced current 20 to flow.

The configuration of the capacitance type switch, the non-contact IC card 14 and the reader / writer 17 will be described with reference to FIG. The capacitive touch switch described with reference to FIG. 1 is disposed between the non-contact IC card 14 and the reader / writer 17 described with reference to FIG. 7, the switch ON / OFF operation is performed by touching the switch electrode 3, and the non-contact IC card 14 is non-contact by matching with the position of the antenna 16 of the reader / writer 17 arranged on the back side of the acrylic 5. Information is transmitted to and received from the IC chip 15 in the IC card 14.

The switch electrode 3 of the present invention can be realized in any shape as long as it has a region that can be touched by a finger or a hand 7. Here, the description will be made assuming that the shape of the switch is a square shape.

FIG. 5 is a diagram of a normal switch electrode 3 and a ground line 4, and shows an example of a configuration in which the entire area of the switch electrode 3 is surrounded by a pattern and the ground line 4 is surrounded by a pattern.

FIG. 6 shows an example of a configuration in which one or more non-conductive portions 23 are provided on the switch electrode 3 and the periphery thereof is surrounded by the ground line 4.

FIG. 7 shows an example of a configuration in which the entire surface of the switch electrode 3 is a pattern and a non-conductive portion 23 is formed on a portion of the ground line 4 surrounded by the pattern.

  FIG. 8 shows an example of a configuration in which one or more non-conductive portions 23 are provided on the switch electrode 3 and the non-conductive portions 23 are formed on a portion of the ground line 4 surrounded by the switch electrode 3.

Hereinafter, the present invention will be described with reference to examples and comparative examples. The present invention is not limited to the following examples, and includes various modifications within the technical scope of the present invention.

Example 1
This will be described with reference to FIG. The panel switch 1 uses a switch electrode 3 in which a silver paste is printed on the surface of a PET film 21, and the switch electrode 3 has a 10 × 10 mm square shape that can be touched by a human finger or hand 7. Around the switch electrode 3, a ground line 4 was provided so as to be surrounded by a 15 × 15 mm square with a pattern width of 1 mm.
This will be described with reference to FIG. The number of switch electrodes 3 is nine in total, three in the horizontal direction and three in the vertical direction so that the antenna 16 of the reader / writer 17 is covered with the switch electrode 3. A 1 mm thick acrylic 5 is placed on the surface of the PET film 21, and a reader / writer 17 (RC-S380 manufactured by Sony Corporation) is placed on the back surface of the PET film 21 at a position surrounded by the nine switch electrodes 3. The structure.
For reading data from the non-contact IC card 14, the reader / writer 17 was connected to a personal computer by USB and software (SFCard Viewer 2 manufactured by Sony Corporation) was used. Further, a non-contact IC card 14 (a test Felica card (“FELICA” is a registered trademark of Sony Corporation)) was used as a test reading card.

Under the above-mentioned conditions, the switch electrode 3 is a 10 × 10 mm square with a 1 mm width pattern, and has a mouth shape without an electrode pattern inside (FIG. 11), and a non-contact IC card 14 is attached to the reader / writer 17. The distance 22 from which the data of the non-contact IC card 14 can be read from the surface of the acrylic 5 was confirmed.

(Example 2)
Under the conditions of the first embodiment, the switch electrode 3 is a 10 mm square with a width of 1 mm and is shaped like a rice field without an electrode pattern inside (FIG. 12), and the reader / writer 17 is contacted with the non-contact IC card 14. The distance 22 at which the data of the non-contact IC card 14 can be read from the surface of the acrylic 5 was confirmed.

(Example 3)
Under the conditions of Example 1, the switch electrode 3 has a 1 mm width pattern in a square area of 10 × 10 mm (FIG. 13) and has a rectangular wave shape with no electrode pattern inside (FIG. 13). The contact IC card 14 was turned and the distance 22 at which the data of the non-contact IC card 14 could be read from the surface of the acrylic 5 was confirmed.

Example 4
Under the conditions of the first embodiment, the shape of the switch electrode 3 is a 10 mm × 10 mm square having a width of 1 mm, the entire surface of the square is a pattern, and the switch electrode 3 is surrounded by a ground wire 4 having a width of 1 mm. The shape is such that a non-conductive part having a width of 1 mm is put in one place (FIG. 14), the non-contact IC card 14 is placed on the reader / writer 17, and the distance 22 at which the data of the non-contact IC card 14 can be read from the surface of the acrylic 5 confirmed.

(Example 5)
Under the conditions of Example 1, the switch electrode 3 is a 10 × 10 mm square region in the shape of a mouth with the entire square as a pattern, and the switch electrode 3 is surrounded by a 1 mm wide ground line 4, A shape (FIG. 15) in which a non-conductive portion 23 having a width of 1 mm is inserted in one place of the ground wire 4, the non-contact IC card 14 is placed on the reader / writer 17, and the data of the non-contact IC card 14 from the surface of the acrylic 5 The distance 22 which can be read was confirmed.

(Example 6)
Under the conditions of the first embodiment, the switch electrode 3 is a 1 mm wide 10 × 10 mm square, and has a shape of a rice field without an electrode pattern inside, and the switch electrode 3 is surrounded by a 1 mm wide ground wire 4. The non-conductive IC card 14 is put on the reader / writer 17 and the non-contact IC card 14 is placed on the surface of the acrylic 5 with a non-conductive portion 23 having a width of 1 mm in one place of the ground wire 4 (FIG. 16). The distance 22 at which the data can be read was confirmed.

(Example 7)
Under the conditions of the first embodiment, the switch electrode 3 is a 1 mm wide pattern in a square area of 10 × 10 mm, and has a rectangular wave shape without an electrode pattern on the inside, and a 1 mm wide ground around the switch electrode 3. A non-conductive IC card 14 is placed on the reader / writer 17 so that the non-conductive IC card 14 is placed on the surface of the acrylic 5. The distance 22 at which the data of the contact IC card 14 can be read was confirmed.

(Comparative Example 1)
Under the conditions of the first embodiment, the switch electrode 3 has a square area with a shape of 10 × 10 mm, and the entire surface of the square is a pattern, and the switch electrode 3 is surrounded by a 15 × 15 mm square with a pattern width of 1 mm. The shape of FIG. 18 was provided with the ground wire 4 (FIG. 18), and the reader / writer 17 was held with the non-contact IC card 14 and the distance 22 at which the data of the non-contact IC card 14 could be read from the surface of the acrylic 5 was confirmed.

From the results of Table 1, in Examples 1 to 7, it was confirmed that the distance 22 at which the data of the non-contact IC card 14 can be read was longer than that in Comparative Example 1. On the other hand, in Comparative Example 1, it was confirmed that the distance 22 at which the data of the non-contact IC card 14 can be read is the shortest.

In the first to third embodiments, since the electrode pattern is missing inside the switch electrode 3, the distance 22 that can be read is increased because the number of places that obstruct the wireless magnetic field 19 is reduced. Further, in Example 4, since one part of the ground wire 4 is not cut into a loop, the distance 22 that can be read is longer than that in Comparative Example 1 because a shielding current that inhibits the wireless magnetic field 19 is not generated.

In the fifth to seventh embodiments, the electrode pattern is removed from the inside of the switch electrode 3, and the ground wire 4 is not cut into a loop due to a part of the ground wire 4, and the shielding current does not flow through the ground wire 4. The distance 22 that can be read is longer than ~ 3. Particularly in Example 7, the result of reading the data of the non-contact IC card 14 with the longest distance 22 was obtained.

(Example 8)
Next, in the configuration described with reference to FIG. 10, the reader / writer 17 was changed to a product of another company, and a similar test was performed. On the back surface of the PET film 21, an antenna 16 (TM02-C-5V manufactured by GL Science Co., Ltd.) of the reader / writer 17 is placed.
The data reading confirmation of the non-contact IC card 14 was performed by connecting the reader / writer 17 to a personal computer with a serial interface and using software (TZ01-DSET manufactured by GL Sciences Inc.). Further, a non-contact IC card 14 (a test Felica card (“FELICA” is a registered trademark of Sony Corporation)) was used as a test reading card.

Under the above-mentioned conditions, the switch electrode 3 is a 10 × 10 mm square having a 1 mm wide pattern, and has a mouth shape without an electrode pattern on the inside (FIG. 11). The ground line 4 was provided so as to be surrounded by a 15 × 15 mm square in pattern width. The non-contact IC card 14 was put on the reader / writer 17 and the distance 22 at which the data of the non-contact IC card 14 could be read from the surface of the acrylic 5 was confirmed.

Example 9
Under the conditions of the eighth embodiment, the switch electrode is a square of 10 mm × 10 mm with a width of 1 and 1 mm, and is shaped like a rice field without an electrode pattern on the inside (FIG. 12), and the reader / writer 17 has a non-contact IC card 14. The distance 22 at which the data of the non-contact IC card 14 can be read from the surface of the acrylic 5 was confirmed.

(Example 10)
Under the conditions of Example 8, the switch electrode 3 is a 1 mm wide pattern in a 10 × 10 mm square region (FIG. 13) with no electrode pattern on the inside (FIG. 13) and is not connected to the reader / writer 17. The contact IC card 14 was turned and the distance 22 at which the data of the non-contact IC card 14 could be read from the surface of the acrylic 5 was confirmed.

(Example 11)
Under the conditions of Example 8, the shape of the switch electrode 3 is a 10 mm × 10 mm square with a width of 1 mm, the entire square surface is a pattern, the switch electrode 3 is surrounded by a ground wire 4 with a width of 1 mm, and 1 of the ground wire 4 is formed. A shape (FIG. 14) in which a non-conductive portion 23 having a width of 1 mm is inserted at a location, the non-contact IC card 14 is placed on the reader / writer 17, and a distance 22 at which the data of the non-contact IC card 14 can be read from the surface of the acrylic 5 is set. confirmed.

(Example 12)
Under the conditions of Example 8, the switch electrode 3 has a 10 × 10 mm square area in the shape of a mouth with the entire square as a pattern, and the switch electrode 3 is surrounded by a 1 mm wide ground line 4, The ground wire 4 has a shape (FIG. 15) in which a non-conductive portion 23 having a width of 1 mm is put in one place, the non-contact IC card 14 is placed on the reader / writer 17, and the non-contact IC card 14 is placed on the surface of the acrylic 5. The distance 22 at which data can be read was confirmed.

(Example 13)
Under the conditions of Example 8, the switch electrode 3 is a 1 mm wide 10 × 10 mm square and is shaped like a rice field with no electrode pattern inside, and the switch electrode 3 is surrounded by a 1 mm wide ground wire 4. The non-conductive IC card 14 is put on the reader / writer 17 and the non-contact IC card 14 is placed on the surface of the acrylic 5 with a non-conductive portion 23 having a width of 1 mm in one place of the ground wire 4 (FIG. 16). The distance 22 at which the data can be read was confirmed.

(Example 14)
Under the conditions of Example 8, the switch electrode 3 is a 1 mm wide pattern in a square area of 10 × 10 mm, and has a rectangular wave shape with no electrode pattern inside, and a 1 mm wide ground around the switch electrode 3. A non-conductive IC card 14 is placed on the reader / writer 17 so that the non-conductive IC card 14 is placed on the surface of the acrylic 5. The distance 22 at which the data of the contact IC card 14 can be read was confirmed.

(Comparative Example 2)
Under the conditions of Example 8, the switch electrode 3 has a square area with a shape of 10 × 10 mm, and the entire surface of the square is a pattern, and the switch electrode 3 is surrounded by a 15 × 15 mm square with a pattern width of 1 mm. The shape of FIG. 18 was provided with the ground wire 4 (FIG. 18), and the reader / writer 17 was held with the non-contact IC card 14 and the distance 22 at which the data of the non-contact IC card 14 could be read from the surface of the acrylic 5 was confirmed.

From the results of Table 2, it was confirmed that in Examples 8 to 14, the distance 22 at which the data of the non-contact IC card 14 can be read is longer than that in Comparative Example 2. On the other hand, in Comparative Example 2, it was confirmed that the distance 22 at which the data of the non-contact IC card 14 can be read was the shortest.

In Examples 8 to 10, since the electrode pattern is missing inside the switch electrode 3, the number of places that obstruct the wireless magnetic field 19 is reduced, and the readable distance 22 is increased. Further, in Example 11, since the ground wire 4 was partially cut and not in a loop, the distance 22 that can be read was longer than that in Comparative Example 2 because the shielding current that hinders the wireless magnetic field 19 was not generated.

In Examples 12 to 14, the electrode pattern is missing inside the switch electrode 3, and the ground line 4 is not cut in part to form a loop, and no shielding current flows through the ground line 4. The distance 22 which can be read from -10 became longer. Particularly, in Example 14, the result that the distance 22 at which data of the non-contact IC card 14 can be read was the longest was obtained.

From the results shown in Tables 1 and 2, the test was performed by changing the device of the reader / writer 17, but the same result was obtained for the distance 22 at which the data of the non-contact IC card 14 can be read. Further, the same test was performed by changing the shape of the switch electrode 3 from a square to a circle, but the readable distance 22 was the same as in Examples 1-14. Moreover, although the same test was carried out by changing the panel switch 1 to a glass epoxy substrate using copper foil in addition to the film material, the results for the distance 22 at which the data of the non-contact IC card 14 can be read are as in Examples 1 to 3. It was equivalent to 14.

1 Panel switch 2 Control board 3 Switch electrode 4 Ground wire 5 Acrylic 6 Adhesive
7 Finger or hand 8 Capacitance 9 Capacitor C
10 Resistance R
11 Input capture 12 Arithmetic processing 13 Switching circuit 14 Non-contact IC card 15 IC chip 16 Antenna 17 Reader / writer 18 Control board 19 Magnetic field 20 Inductive current 21 PET film 22 Readable distance 23 Non-conductive part

Claims (2)

A device provided with a non-contact IC card, a reader / writer for exchanging information via each antenna, and a capacitive coupling switch, one in the switch electrode region of the capacitive coupling switch An apparatus in which the above non-conductive portion is formed. The apparatus according to claim 1, wherein a ground line surrounding the switch electrode of the capacitive coupling switch is provided, and at least one portion of the ground line is a non-conductive portion.

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