Classifications

• • G—PHYSICS
  • G06—COMPUTING; CALCULATING OR COUNTING
  • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
  • G06K19/00—Record carriers for use with machines and with at least a part designed to carry digital markings
  • G06K19/06—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
  • G06K19/067—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components
  • G06K19/07—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips
  • G06K19/073—Special arrangements for circuits, e.g. for protecting identification code in memory
  • G06K19/07309—Means for preventing undesired reading or writing from or onto record carriers
  • G06K19/07345—Means for preventing undesired reading or writing from or onto record carriers by activating or deactivating at least a part of the circuit on the record carrier, e.g. ON/OFF switches
• • G—PHYSICS
  • G06—COMPUTING; CALCULATING OR COUNTING
  • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
  • G06K19/00—Record carriers for use with machines and with at least a part designed to carry digital markings
  • G06K19/06—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
  • G06K19/067—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components
  • G06K19/07—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips
  • G06K19/077—Constructional details, e.g. mounting of circuits in the carrier
  • G06K19/07749—Constructional details, e.g. mounting of circuits in the carrier the record carrier being capable of non-contact communication, e.g. constructional details of the antenna of a non-contact smart card
  • G06K19/0775—Constructional details, e.g. mounting of circuits in the carrier the record carrier being capable of non-contact communication, e.g. constructional details of the antenna of a non-contact smart card arrangements for connecting the integrated circuit to the antenna
• • G—PHYSICS
  • G06—COMPUTING; CALCULATING OR COUNTING
  • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
  • G06K19/00—Record carriers for use with machines and with at least a part designed to carry digital markings
  • G06K19/06—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
  • G06K19/067—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components
  • G06K19/07—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips
  • G06K19/077—Constructional details, e.g. mounting of circuits in the carrier
  • G06K19/07749—Constructional details, e.g. mounting of circuits in the carrier the record carrier being capable of non-contact communication, e.g. constructional details of the antenna of a non-contact smart card
  • G06K19/07773—Antenna details
  • G06K19/07777—Antenna details the antenna being of the inductive type
  • G06K19/07779—Antenna details the antenna being of the inductive type the inductive antenna being a coil
  • G06K19/07783—Antenna details the antenna being of the inductive type the inductive antenna being a coil the coil being planar
• • H—ELECTRICITY
  • H03—ELECTRONIC CIRCUITRY
  • H03K—PULSE TECHNIQUE
  • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
  • H03K17/94—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the way in which the control signals are generated
  • H03K17/96—Touch switches
  • H03K17/962—Capacitive touch switches

Definitions

• Radiofreguence communication device
• the present invention relates to a radiofrequency identification device provided with a means of interruption of operation and concerns in particular a radiofrequency communication device whose operation is controlled by a voluntary gesture of the wearer.
• Radiofrequency identification devices are provided.
• a contactless RFID device is a device consisting of an antenna and a chip connected to the terminals of the antenna. The chip is not powered and receives its energy by electromagnetic coupling between the antenna of the reader and the antenna of the RFID device, information is exchanged between the RFID device and the reader and in particular the information stored in the chip which has relates to the identification of the owner of the object on which the RFID device is located and its authorization to enter a controlled access zone for example.
• the RFID device 111 illustrated in FIG. 1 is provided with a control device 116 comprising capacitive surfaces 117 and 118 which when they are are covered by the finger of the user allow the transmission of data from the device to the reader.
• the device comprises an electronic module 114 connected by two connection pads 113 to an antenna 112.
• the antenna is also connected to the two capacitive surfaces 117 and 118, each forming one of the two plates of two capacitors not shown in FIG. 116.
• the circuit composed of the chip 114, the antenna 112 and the control device 116 is thus open at the location of the capacitive surfaces 117 and 118.
• FIG. 2 represents the equivalent electrical diagram of the device of the prior art shown in FIG. 1.
• the antenna 112 is equivalent to an inductance L, a resistor r and an inter-turn capacitance Cf.
• the inter-turn capacitance Cf represents the capacity due to the winding of the turns and is created in the space between the turns 110.
• the control device 116 is equivalent to a variable capacity Cg.
• C represents the input capacitance of the chip 114 and R the load resistor of the chip 114.
• the antenna 112, the chip 114 and the control device 116 are in parallel.
• the device described above has a number of disadvantages. It is known that a circuit formed by a chip and an antenna is an oscillating circuit whose optimal operation is obtained when the resonance law of the following circuit is respected:
• the device of FIG. 1 must not allow the transmission of the data of the chip whose resonant frequency of the open circuit is remote from the data transmission frequency equal to 13.56 MHz.
• the input capacitance C of the chip being fixed, the inductance L of the antenna must be low to increase the value of f 0 . Therefore the antenna must have few turns, which induces a low antenna gain, inter-turn capacitance C £ low.
• the product L * C is determined so that the resonance frequency of the open circuit is well beyond the frequency threshold which allows the exchange of data. For this, the frequency of the open circuit is of the order of 40 MHz.
• the capacitance Cg increases the total capacity of the circuit of the device of the prior art and consequently decreases the resonant frequency of the circuit until it reaches the frequency necessary to allow the exchange of data.
• the value is preponderant in the operation of the device of the prior art.
• this value is linked on the one hand to the capacitance values C1 and C2 of the two capacitors which must be important and on the other hand is related to the positioning of the finger, the applied force and the coupling obtained. Therefore the device of the prior art has a non-homogeneous operation since depending on how the user grasps and actuates the control device. This can slow down and disrupt the reading of the card when it is used in a real-life situation, for example during an access control or an identity check.
• the circuit when the finger is not affixed to the card, the circuit is open at the capacitors but the antenna 112 and the chip 114 continue to form a closed circuit.
• the RFID device can thus always receive energy from the reader because the chip is always connected to the antenna. This means that the communication of data between the RFID device and the reader remains possible and will depend on the power emitted by the reader.
• the object of the invention is to provide a radiofrequency device which overcomes the aforementioned drawbacks, the optimal operation of which is triggered by a voluntary action of the carrier homogeneously.
• the object of the invention is therefore a non-contact portable device composed of at least two layers,
• a support layer having on its first face an antenna formed of a plane winding of turns which intersect through an electrically insulating bridge, - A protective layer bonded to the first face of the support layer;
• the antenna comprising two cuts it consists of two strands and four ends including two connection ends for the connection of a chip.
• the antenna comprises two ends each extended by a stud, the two studs are not in contact with each other and are separated by a thin space so as to make the antenna open, both studs being located on the same plane as the antenna.
• the antenna is closed by the circulation of a current between the two pads through the protective layer when a user places his finger on the protective layer at the location of the pads thus allowing the communication between the chip and a reader associated with the non-contact portable device.
• FIG. 1 represents the device of the prior art
• FIG. 2 represents the equivalent electric diagram of the device of the prior art of FIG. 1;
• FIG. 3 represents a general diagram of the radiofrequency device according to the invention;
• FIG. 4 represents the equivalent electrical diagram of the radiofrequency device according to the invention of FIG. 3,
• FIG. 5 represents a detailed diagram of the sensitive zone equipping the device according to the invention.
• the radiofrequency device according to the invention is a non-contact device intended to communicate remotely with a reader.
• the device according to the invention advantageously applies to a card or a contactless ticket in the standard format of a smart card or to a passport cover called "inlay".
• the device described here may be of another format without departing from the scope of the invention.
• the device according to the invention comprises a support layer 311 shown in FIG. 3.
• the support layer 311 is made of paper, synthetic paper (of the Teslin type) or of another material such as polycarbonate from PET or PVC. .
• a circuit comprising an antenna 312, a chip 314 and a sensitive zone 316 is produced.
• the antenna preferably planar, is produced by screen printing, flexography, gravure, offset printing. or inkjet from epoxy ink conductive ink loaded with conductive particles such as for example silver or gold or from a conductive polymer.
• the antenna can also be made using other techniques such as etching.
• the antenna is formed of a plane winding of turns 310 which intersect without being short-circuited by passing on and under an electrically layer 309.
• the antenna 312 comprises at least two turns 310. However, the antenna being adjusted to the chip, the number of turns depends on the type of chip used.
• the turns preferably have a constant spacing between them between 0.1 mm and 1 mm depending on the technology used.
• the antenna is cut in two places so that it comprises two cuts, two strands and four ends.
• the antenna 312 has two connection ends 321 and 322 on which the chip 314 is connected.
• the chip 314 is connected according to a known method such as the flip-chip connection or according to other methods.
• the antenna also has two other ends 323 and 324 each extended by a stud 333 and 33.
• the two pads 333 and 334 form the sensitive area 316 of the antenna.
• the two pads are made according to the same printing or etching process as the antenna 312 and are located on the support layer 311, therefore in the same plane as the antenna 312.
• the pads are manufactured at the same time. as the antenna, they are made of the same material as the antenna so they are an integral part of the antenna.
• the two studs located in the same plane are not in contact with each other and are separated by a space between 0.1 and 1.5 mm.
• the stud 333 extends the end 323 of the antenna, which means that the stud 333 is connected to the end 323 of the antenna, and the stud 334 is connected to the end 324 of the antenna.
• the length of the first antenna wire located between the connecting end 322 and the end 323 of the antenna is as small as possible; this length must not exceed 10% of the total length of the antenna and is preferably less than 5%, which makes it possible to prevent any supply of the chip when the circuit is open and thus to prevent any transmission of data between the contactless device and the reader.
• the second antenna wire is located between the connection end 321 of the chip 314 and the end 324 of the the antenna.
• the location of the bridge 309 is located on the antenna in the middle of the second strand which makes it possible to adapt the antenna to the chip so as to maximize the transfer of energy when the circuit is closed and thus optimize the data transmission. between the contactless device and the reader.
• the support layer 311 is covered with at least one protective layer to protect the circuit and to finalize the device.
• this first layer can be paper, synthetic paper, PVC, PET, PC, etc.
• the antenna support layer is inserted between two plastic protective layers (PVC, PET, PC) constituting the upper and lower card bodies and heat-sealed by hot-pressurized laminating.
• PVC, PET, PC plastic protective layers
• the sensitive zone is disposed between two layers so as to be electrically insulated from the outside.
• this first layer is made of paper or synthetic paper teslin type.
• FIG. 4 represents the equivalent circuit diagram of the electronic circuit represented in FIG. 3.
• the circuit comprises the antenna 312, the sensitive zone 316 and the chip 314.
• the antenna 312 is equivalent to an inductance L, a resistor r and a capacitance inter-turns Cf.
• the inter-turn capacitance Cf is created in the space between the turns 310 and represents the capacitance due to the winding of the turns.
• the sensitive area 316 is equivalent to a variable capacity Ce.
• C represents the input capacitance of the chip and R the load resistance of the chip.
• the chip 314 is therefore in series with the sensitive zone 316.
• the sensitive area 316 is open which corresponds to a capacity Ce almost zero.
• the branch of the circuit comprising the chip is thus by default open.
• the chip does not receive power when the antenna is open. There is therefore no exchange of information between the card and a reader associated.
• the value of the resonance frequency of the open circuit is not critical to prevent the exchange of data.
• the value of the resonance frequency of the device according to the invention may be less than 20 MHz while preventing the operation of the card without the apposition of the finger to the sensitive area.
• the resonant frequency of the device according to the invention is by default equal to:
• FIG. 5 An exemplary embodiment of the sensitive zone 316 according to the invention is shown in FIG. 5.
• the dimensions of the sensitive zone are of the order of one inch.
• the sensitive zone is of elliptical shape but could be rectangular, square, parallelepiped without departing from the scope of the invention.
• the sensitive zone is formed of two distinct pads 333 and 334 nested one inside the other but having no area in contact because separated by a thin space 525.
• the space 525 is delimited by the facing edges 523 and 524 of the two distinct pads 333 and 334. These edges are preferably parallel so that the space 525 has a constant width. This width is of the order of one millimeter and is preferably between 0.1 mm and 1.5 mm.
• the application of a finger by the card holder on the sensitive area 316 causes a current flow between the two parts 521 and 522 because the finger has a low resistance, and an increase in the capacitance Ce of the sensitive area 316
• the sensitive zone 316 is then in the closed position, the circuit composed of the chip 314, the antenna 312 and the sensitive zone is closed thereby allowing communication between the chip and a reader associated with the non-contact portable device.
• k is a coefficient related to the shape of the sensitive zone and to the capacitance Ce of the sensitive zone.
• the device according to the invention has the advantage of not having a mechanical interface or assembly of moving mechanical parts such as can be seen in a switch.
• the sensitive zone does not include an element such as a sensor or other.
• the device according to the invention does not have a conductive surface on its external surface. The sensing zone being made simultaneously with the antenna on the antenna support layer, the sensitive zone is completely concealed in the device, under the protective layer.

Landscapes

• Engineering & Computer Science (AREA)
• Computer Hardware Design (AREA)
• Microelectronics & Electronic Packaging (AREA)
• Physics & Mathematics (AREA)
• General Physics & Mathematics (AREA)
• Theoretical Computer Science (AREA)
• Computer Security & Cryptography (AREA)
• General Engineering & Computer Science (AREA)
• Computer Networks & Wireless Communication (AREA)
• Credit Cards Or The Like (AREA)
• Near-Field Transmission Systems (AREA)
• Support Of Aerials (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=47557345

Family Applications (1)

Country Status (14)

Families Citing this family (7)

Family Cites Families (13)

• 2011
  • 2011-11-15 FR FR1103471A patent/FR2982687A1/fr not_active Withdrawn
• 2012
  • 2012-11-15 CN CN201280064261.9A patent/CN104040563A/zh active Pending
  • 2012-11-15 US US13/678,016 patent/US8870075B2/en active Active
  • 2012-11-15 KR KR1020147013059A patent/KR20140101734A/ko not_active Application Discontinuation
  • 2012-11-15 SG SG11201402295TA patent/SG11201402295TA/en unknown
  • 2012-11-15 TW TW101142774A patent/TWI574210B/zh active
  • 2012-11-15 EP EP12813898.9A patent/EP2780867A1/de not_active Withdrawn
  • 2012-11-15 JP JP2014540532A patent/JP2015502600A/ja active Pending
  • 2012-11-15 RU RU2014124151/08A patent/RU2014124151A/ru not_active Application Discontinuation
  • 2012-11-15 BR BR112014011324A patent/BR112014011324A2/pt not_active Application Discontinuation
  • 2012-11-15 WO PCT/FR2012/000460 patent/WO2013072578A1/fr active Application Filing
  • 2012-11-15 MX MX2014005920A patent/MX2014005920A/es active IP Right Grant
• 2014
  • 2014-05-13 ZA ZA2014/03418A patent/ZA201403418B/en unknown
• 2015
  • 2015-03-12 HK HK15102419.2A patent/HK1201961A1/xx unknown

Non-Patent Citations (1)

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