WO2011067428A1 - Contactless smart card - Google Patents
Contactless smart card Download PDFInfo
- Publication number
- WO2011067428A1 WO2011067428A1 PCT/ES2009/070558 ES2009070558W WO2011067428A1 WO 2011067428 A1 WO2011067428 A1 WO 2011067428A1 ES 2009070558 W ES2009070558 W ES 2009070558W WO 2011067428 A1 WO2011067428 A1 WO 2011067428A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- card
- smart card
- contactless smart
- capacitive sensor
- microprocessor
- Prior art date
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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
- G06K19/07354—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 by biometrically sensitive means, e.g. fingerprint sensitive
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- 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
- G06K19/0716—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 at least one of the integrated circuit chips comprising a sensor or an interface to a sensor
- G06K19/0718—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 at least one of the integrated circuit chips comprising a sensor or an interface to a sensor the sensor being of the biometric kind, e.g. fingerprint sensors
-
- 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
- G06K19/0723—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 the record carrier comprising an arrangement for non-contact communication, e.g. wireless communication circuits on transponder cards, non-contact smart cards or RFIDs
Definitions
- the invention relates to the magnetic and security card sector, in particular for contactless cards. Specifically, it focuses on the implantation of a capacitive sensor on the card itself, which prevents activation of the card without positioning the user's finger on said sensor.
- Smart cards are plastic cards, similar in size and others to credit cards, which have an integrated circuit stamped on them. There are smart cards with contacts and without contacts, both being able to perform the same functions, but using different transmission protocols in logical and physical layer. So, focusing on the cards Smart contacts without contacts, these do not use a galvanic contact but inductive interaction, which does not need to be introduced into an intelligent reader terminal.
- Patent EP 1706852 is known in the state of the art, which consists of an identification card that has means for generating and transmitting signals in the body of the cardholder, and means for receive and interpret the signals of the cardholder's body.
- the signals are attenuated by the bioelectrical impedance of the cardholder's body, such that the interpretation of the attenuated signals by means of interpretation provides a bioelectrical impedance signature to uniquely identify the cardholder.
- the means for generating and transmitting signals in the cardholder's body and the means for receiving and interpreting the signals of the cardholder's body comprise a controller that has a central processing unit and an associated memory, two or more electrodes.
- the two or more electrodes are arranged on the opposite main faces of the identification card and are positioned such that the index finger and the thumb are naturally located thereon when the card is held between the index and thumb fingers, and when the cardholder holds the electrodes between his index and his thumb for a predetermined period of time, the card's own energy source is activated.
- WO 2009/005927 describes a fraud control method associated with prepaid devices. It includes the configuration of the anti-fraud platform parameters comprising one or more of the limits defined by one or more limit values associated with a particular platform parameter, one or more thresholds defined by one or more threshold values associated with a particular platform parameter, and one or more rules that define the restrictions of certain prepaid device activities. The method also includes the application of fraud parameters to the device production data prepaid platform and determining whether the issuance of the device prepaid, depending on whether the parameters were caused by data production.
- the proposed invention consists of a contactless smart card that uses a capacitive sensor made with a thin layer of metallic material (copper or aluminum) incorporated into the screen printing of the card, so that when a finger is approached a variation in the capacity which is detected by the microcontroller as a valid pulse of the sensor.
- an oscillator of a known frequency is created that allows the detection capacitor to be loaded and unloaded, which is implemented by means of a copper metallic foil engraved on the screen of the card.
- the timer of the microcontroller together with the corresponding software is able to detect that it is a valid pulse of the capacitive sensor.
- Figure 1 shows a schematic view of the contactless smart card of the invention.
- Contactless smart card comprising a plastic support (3) with at least one part of its surface a registration area, an antenna (4) and an integrated circuit (3) inserted in the plastic support (1) that It contains a microprocessor with the timer and the corresponding software.
- This card is characterized by its advantages over those of the same type that allow distance reading without user authorization. This is achieved thanks to the provision on its own support (1) of a capacitive sensor (1) incorporated into the screen printing of the card, which is implemented by a thin metallic sheet of material chosen from copper, aluminum or other flexible metallic material.
- a capacitive sensor (1) incorporated into the screen printing of the card, which is implemented by a thin metallic sheet of material chosen from copper, aluminum or other flexible metallic material.
- the timer of the microcontroller together with the corresponding software is able to detect that it is a valid pulse of the capacitive sensor. In this way, the card is not activated when any radiofrequency field radiates the card, but only when the finger is located on the capacitive sensor (1). This prevents the execution of commands without the express authorization of the user.
Abstract
The invention relates to a contactless smart card including a plastic substrate (3), at least one portion of the surface of which comprises a recording area, an antenna (4), and an integrated circuit (3) inserted into the plastic substrate (1) which contains a microprocessor having the corresponding timer and software. The card also includes a capacitive sensor (1) made from a thin metal sheet of copper, aluminium, or other flexible metal material, built into the printed layer of the card, such that a capacitance variation is generated in response to the approach of a finger and this is detected by the microprocessor as a valid pressing of the sensor.
Description
TARJETA INTELIGENTE SIN CONTACTOS DESCRIPCIÓN SMART CARD WITHOUT CONTACTS DESCRIPTION
Tarjeta inteligente sin contactos Contactless smart card
Objeto de la invención Object of the invention
La invención se refiere al sector de las tarjetas magnéticas y de seguridad, en particular para las tarjetas sin contactos. Concretamente se centra en la implantación en la propia tarjeta de un sensor capacitivo, que impide la activación de la tarjeta sin el posicionamiento del dedo del usuario sobre dicho sensor. The invention relates to the magnetic and security card sector, in particular for contactless cards. Specifically, it focuses on the implantation of a capacitive sensor on the card itself, which prevents activation of the card without positioning the user's finger on said sensor.
Antecedentes de la invención Background of the invention
Dado el desarrollo de la tecnología se hace necesario un constante avance en el manejo de la información en forma rápida, oportuna y sin límites en demoras o de formatos en papel. De este modo, se hace necesaria la utilización de las nuevas tecnologías aplicadas a las tarjetas inteligentes. Given the development of technology, a constant advance in the management of information is necessary in a fast, timely and unlimited way in delays or paper formats. In this way, the use of new technologies applied to smart cards is necessary.
Las tarjetas inteligentes son tarjetas de plástico, similares en tamaño y otros a las tarjetas de crédito, que llevan estampadas un circuito integrado. Existen tarjetas inteligentes con contactos y sin contactos, pudiendo realizar ambas las mismas funciones, pero utilizando diferentes protocolos de transmisión en capa lógica y física. Así, centrándonos en las tarjetas
inteligentes sin contactos, éstas no utilizan un contacto galvánico sino de interíase inductiva, que no necesita ser introducida en un terminal de lector inteligente. Smart cards are plastic cards, similar in size and others to credit cards, which have an integrated circuit stamped on them. There are smart cards with contacts and without contacts, both being able to perform the same functions, but using different transmission protocols in logical and physical layer. So, focusing on the cards Smart contacts without contacts, these do not use a galvanic contact but inductive interaction, which does not need to be introduced into an intelligent reader terminal.
Cada vez es más frecuente ver tarjetas inteligentes o identificadoras sin contacto con el sistema de lectura, o sistema de identificación por radiofrecuencia. Estos dispositivos sustituyen en gran medida a las etiquetas de códigos de barras y a las tarjetas magnéticas en todas sus aplicaciones. It is increasingly common to see smart cards or identifiers without contact with the reading system, or radiofrequency identification system. These devices largely replace barcode labels and magnetic cards in all their applications.
El uso de tecnologías sin contactos se está popularizando en numerosos entornos como son los pagos sin contactos, el pasaporte electrónico, controles de acceso, etc. De este modo, entre las aplicaciones más corrientes destacan los sistemas de control de accesos y la inmovilización de vehículos. En el control de accesos se gana en comodidad, no es necesario el contacto físico de la tarjeta con el lector, lo que lo hace más cómodo y más rápido de usar. Este es un sistema en el que el dispositivo que lee los datos tiene que poder leer muchas tarjetas diferentes, tantas como usuarios haya autorizados. The use of contactless technologies is becoming popular in numerous environments such as contactless payments, electronic passport, access controls, etc. Thus, among the most common applications, access control systems and vehicle immobilization stand out. In access control you gain in comfort, the physical contact of the card with the reader is not necessary, which makes it more comfortable and faster to use. This is a system in which the device that reads the data must be able to read many different cards, as many as users have authorized.
Sin embargo, existen algunos problemas asociados a la falta de seguridad de las tarjetas. Se ha demostrado que es posible la activación de la tarjeta a distancia mediante un lector sin contactos para leer datos sin la autorización del usuario. Actualmente existen soluciones que evitan la lectura sin autorización como son el uso de una funda metálica para apantallar la tarjeta o mediante la incorporación de un diminuto interruptor que permite activa la tarjeta sólo cuando está pulsado. Pero su uso no está extendido debido a la incomodidad de uso. However, there are some problems associated with the lack of security of the cards. It has been shown that remote card activation is possible through a contactless reader to read data without user authorization. Currently there are solutions that prevent reading without authorization such as the use of a metal case to shield the card or by incorporating a tiny switch that allows the card to be activated only when pressed. But its use is not extended due to the inconvenience of use.
Se conoce en el estado de la técnica la patente EP 1706852, que consiste en una tarjeta de identificación que tiene medios para generar y transmitir señales en el cuerpo del poseedor de la tarjeta, y medios para
recibir e interpretar las señales del cuerpo del poseedor de la tarjeta. Las señales están atenuadas mediante la impedancia bioeléctrica del cuerpo del poseedor de la tarjeta, de tal modo que la interpretación de las señales atenuadas mediante los medios de interpretación proporciona una firma de impedancia bioeléctrica para identificar de manera exclusiva el poseedor de la tarjeta. Los medios para generar y transmitir señales en el cuerpo del poseedor de la tarjeta y los medios para recibir e interpretar las señales del cuerpo del poseedor de la tarjeta comprenden un controlador que tiene una unidad central de procesado y una memoria asociada, dos o más electrodos dispuestos en una superficie exterior de la tarjeta y un conjunto de circuitos electrónicos de control que acoplan eléctricamente los electrodos al controlador, en la que la tarjeta tiene su propia fuente de energía en la placa, capaz de proporcionar suficiente energía para el funcionamiento independiente de la tarjeta de identificación. Los dos o más electrodos están dispuestos en las caras principales opuestas de la tarjeta de identificación y están situados de tal manera que el dedo índice y el pulgar están situados de manera natural sobre los mismos cuando la tarjeta está sostenida entre los dedos índice y pulgar, y cuando el poseedor de la tarjeta sostiene los electrodos entre su índice y su pulgar durante un periodo de tiempo predeterminado, se activa la propia fuente de energía de la tarjeta. Patent EP 1706852 is known in the state of the art, which consists of an identification card that has means for generating and transmitting signals in the body of the cardholder, and means for receive and interpret the signals of the cardholder's body. The signals are attenuated by the bioelectrical impedance of the cardholder's body, such that the interpretation of the attenuated signals by means of interpretation provides a bioelectrical impedance signature to uniquely identify the cardholder. The means for generating and transmitting signals in the cardholder's body and the means for receiving and interpreting the signals of the cardholder's body comprise a controller that has a central processing unit and an associated memory, two or more electrodes. arranged on an outer surface of the card and a set of electronic control circuits that electrically couple the electrodes to the controller, in which the card has its own power source on the board, capable of providing sufficient energy for independent operation of the ID card. The two or more electrodes are arranged on the opposite main faces of the identification card and are positioned such that the index finger and the thumb are naturally located thereon when the card is held between the index and thumb fingers, and when the cardholder holds the electrodes between his index and his thumb for a predetermined period of time, the card's own energy source is activated.
La patente WO 2009/005927 describe un método de control del fraude asociado a los dispositivos de prepago. Incluye la configuración de los parámetros de la plataforma contra el fraude que comprenden uno o más de los límites definidos por uno o más valores límite asociados con un parámetro de plataforma en particular, uno o varios umbrales definidos por uno o más valores de umbral asociadas con un parámetro de plataforma en particular, y una o más reglas que definen las restricciones de ciertas actividades dispositivo de prepago. El método incluye además la aplicación de los parámetros de fraude a la plataforma de prepago de datos de producción de dispositivos y determinar si la expedición del dispositivo de
prepago, dependiendo de si los parámetros fueron provocados por la producción de datos. WO 2009/005927 describes a fraud control method associated with prepaid devices. It includes the configuration of the anti-fraud platform parameters comprising one or more of the limits defined by one or more limit values associated with a particular platform parameter, one or more thresholds defined by one or more threshold values associated with a particular platform parameter, and one or more rules that define the restrictions of certain prepaid device activities. The method also includes the application of fraud parameters to the device production data prepaid platform and determining whether the issuance of the device prepaid, depending on whether the parameters were caused by data production.
Descripción de la invención Description of the invention
La invención propuesta consiste en una tarjeta inteligente sin contactos que utiliza un sensor capacitivo realizado con una fina capa de material metálico (cobre o aluminio) incorporado a la serigrafía de la tarjeta, de forma que al aproximar un dedo se produce una variación en la capacidad que es detectada por el microcontrolador como una pulsación válida del sensor. The proposed invention consists of a contactless smart card that uses a capacitive sensor made with a thin layer of metallic material (copper or aluminum) incorporated into the screen printing of the card, so that when a finger is approached a variation in the capacity which is detected by the microcontroller as a valid pulse of the sensor.
Mediante un procedimiento software se crea un oscilador de una frecuencia conocida que permite cargar y descargar el condensador de detección que se implementa mediante una lámina metálica de cobre grabado en la serigrafía de la tarjeta. Los cambios en la capacidad del sensor de contacto, producidos cuando un dedo del usuario toca la superficie metálica, generan un cambio en la frecuencia del oscilador. El timer del microcontrolador junto con el software correspondiente, es capaz de detectar que se trata de una pulsación válida del sensor capacitivo. By means of a software procedure, an oscillator of a known frequency is created that allows the detection capacitor to be loaded and unloaded, which is implemented by means of a copper metallic foil engraved on the screen of the card. The changes in the capacity of the contact sensor, produced when a finger of the user touches the metal surface, generate a change in the frequency of the oscillator. The timer of the microcontroller together with the corresponding software is able to detect that it is a valid pulse of the capacitive sensor.
De esta forma, cuando un campo de radiofrecuencia irradia la tarjeta, ésta se activa, pero no responde a ningún comando si previamente no detecta que un dedo esté situado en el sensor capacitivo. In this way, when a radiofrequency field radiates the card, it activates, but does not respond to any command if it does not previously detect that a finger is located on the capacitive sensor.
Así, se evita el procesamiento de comandos sin la autorización expresa del usuario.
Descripción de los dibujos Thus, command processing is avoided without the express authorization of the user. Description of the drawings
Para completar la descripción que se está realizando y con objeto de ayudar a una mejor comprensión de las características del invento, de acuerdo con un ejemplo preferente de la realización práctica del mismo, se acompaña como parte integrante de dicha descripción, un juego de dibujos en donde con carácter ilustrativo y no limitativo, se ha representado lo siguiente: To complete the description that is being made and in order to help a better understanding of the characteristics of the invention, according to a preferred example of the practical realization thereof, a set of drawings is accompanied as an integral part of said description. where for illustrative and non-limiting purposes, the following has been represented:
La Figura 1 .- muestra una vista esquemática de la tarjeta inteligente sin contactos de la invención. Figure 1 .- shows a schematic view of the contactless smart card of the invention.
Realización preferente de la invención Preferred Embodiment of the Invention
Tarjeta inteligente sin contactos, que comprende un soporte (3) de plástico con al menos en una parte de su superficie una zona de registro, una antena (4) y un circuito integrado (3) insertado en el soporte (1 ) de plástico que contiene un microprocesador con el timer y el software correspondiente. Contactless smart card, comprising a plastic support (3) with at least one part of its surface a registration area, an antenna (4) and an integrated circuit (3) inserted in the plastic support (1) that It contains a microprocessor with the timer and the corresponding software.
Esta tarjeta se caracteriza por sus ventajas frente a aquellas del mismo tipo que permiten la lectura a distancia sin autorización del usuario. Esto lo consigue gracias a la disposición en su propio soporte (1 ) de un sensor capacitivo (1 ) incorporado a la serigrafía de la tarjeta, que se implementa mediante una fina lámina metálica de material elegido entre cobre, aluminio u otro material metálico flexible. De este modo, la activación de la tarjeta únicamente se autoriza al aproximar el dedo a dicho sensor (1 ), provocando una variación en la capacidad que es detectada por el microprocesador como una pulsación válida del sensor.
Mediante software se crea un oscilador de frecuencia conocida que permite cargar y descargar el sensor capacitivo (1 ). Los cambios en la capacidad del sensor capacitivo (1 ), producidos cuando el usuario toca la superficie metálica, generan un cambio en la frecuencia del oscilador. El timer del microcontrolador junto con el software correspondiente, es capaz de detectar que se trata de una pulsación válida del sensor capacitivo. De este modo, la tarjeta no se activa cuando un campo de radiofrecuencia cualquiera irradia la tarjeta, sino que únicamente lo hará cuando el dedo esté situado en el sensor capacitivo (1 ). Esto evita la ejecución de comandos sin la autorización expresa del usuario.
This card is characterized by its advantages over those of the same type that allow distance reading without user authorization. This is achieved thanks to the provision on its own support (1) of a capacitive sensor (1) incorporated into the screen printing of the card, which is implemented by a thin metallic sheet of material chosen from copper, aluminum or other flexible metallic material. Thus, the activation of the card is authorized only when the finger is approached to said sensor (1), causing a variation in the capacity that is detected by the microprocessor as a valid pulse of the sensor. Using software, an oscillator of known frequency is created that allows the capacitive sensor to be loaded and unloaded (1). Changes in the capacity of the capacitive sensor (1), produced when the user touches the metal surface, generate a change in the frequency of the oscillator. The timer of the microcontroller together with the corresponding software is able to detect that it is a valid pulse of the capacitive sensor. In this way, the card is not activated when any radiofrequency field radiates the card, but only when the finger is located on the capacitive sensor (1). This prevents the execution of commands without the express authorization of the user.
Claims
1 . - Tarjeta inteligente sin contactos, que comprende un soporte (3) de plástico con al menos en una parte de su superficie una zona de registro, una antena (4) y un circuito integrado (3) insertado en el soporte (1 ) de plástico que contiene un microprocesador con el timer y el software correspondiente, caracterizada porque dispone de un sensor capacitivo (1 ) incorporado a la serigrafía de la tarjeta, de manera que al aproximar un dedo se produce una variación en la capacidad que es detectada por el microprocesador como una pulsación válida del sensor. one . - Contactless smart card, comprising a plastic support (3) with at least one part of its surface a registration area, an antenna (4) and an integrated circuit (3) inserted in the plastic support (1) which contains a microprocessor with the timer and the corresponding software, characterized in that it has a capacitive sensor (1) incorporated into the screen printing of the card, so that when a finger is approached there is a variation in the capacity that is detected by the microprocessor as a valid pulse of the sensor.
2. - Tarjeta inteligente sin contactos, según reivindicación 1 , caracterizada porque se establece en la propia tarjeta un oscilador de frecuencia conocida, mediante software, que permite cargar y descargar el sensor capacitivo (1 ). 2. - Contactless smart card, according to claim 1, characterized in that an oscillator of known frequency is established on the card itself, by means of software, which allows the capacitive sensor to be loaded and unloaded (1).
3. - Tarjeta inteligente sin contactos, según reivindicaciones anteriores, caracterizada porque el sensor capacitivo (1 ) se implementa mediante una fina lámina metálica de material elegido entre cobre, aluminio u otro material metálico flexible. 3. - Contactless smart card, according to previous claims, characterized in that the capacitive sensor (1) is implemented by a thin metal sheet of material chosen from copper, aluminum or other flexible metallic material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/ES2009/070558 WO2011067428A1 (en) | 2009-12-04 | 2009-12-04 | Contactless smart card |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/ES2009/070558 WO2011067428A1 (en) | 2009-12-04 | 2009-12-04 | Contactless smart card |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2011067428A1 true WO2011067428A1 (en) | 2011-06-09 |
Family
ID=44114634
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/ES2009/070558 WO2011067428A1 (en) | 2009-12-04 | 2009-12-04 | Contactless smart card |
Country Status (1)
| Country | Link |
|---|---|
| WO (1) | WO2011067428A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103235924A (en) * | 2013-03-28 | 2013-08-07 | 东信和平科技股份有限公司 | Capacitive sensing method and capacitive sensing device of non-contact card reader |
| FR3021456A1 (en) * | 2014-05-23 | 2015-11-27 | Oberthur Technologies | METHOD FOR MANUFACTURING A SENSOR ON AN INSULATING SUBSTRATE |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006138440A2 (en) * | 2005-06-16 | 2006-12-28 | Visa International Service Association | Contactless activation systems and methods |
| US7307485B1 (en) * | 2005-11-14 | 2007-12-11 | Cypress Semiconductor Corporation | Capacitance sensor using relaxation oscillators |
| US7541816B1 (en) * | 2008-05-05 | 2009-06-02 | Generalplus Technology Inc. | Capacitive sensor |
-
2009
- 2009-12-04 WO PCT/ES2009/070558 patent/WO2011067428A1/en active Application Filing
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006138440A2 (en) * | 2005-06-16 | 2006-12-28 | Visa International Service Association | Contactless activation systems and methods |
| US7307485B1 (en) * | 2005-11-14 | 2007-12-11 | Cypress Semiconductor Corporation | Capacitance sensor using relaxation oscillators |
| US7541816B1 (en) * | 2008-05-05 | 2009-06-02 | Generalplus Technology Inc. | Capacitive sensor |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103235924A (en) * | 2013-03-28 | 2013-08-07 | 东信和平科技股份有限公司 | Capacitive sensing method and capacitive sensing device of non-contact card reader |
| FR3021456A1 (en) * | 2014-05-23 | 2015-11-27 | Oberthur Technologies | METHOD FOR MANUFACTURING A SENSOR ON AN INSULATING SUBSTRATE |
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