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    EVALUATION OF NUMBER OF ELECTROMAGNETIC TRANSPONDERS IN READER FIELD
    21.
    发明专利
    EVALUATION OF NUMBER OF ELECTROMAGNETIC TRANSPONDERS IN READER FIELD 失效

    公开(公告)号：JP2002009661A

    公开(公告)日：2002-01-11

    申请号：JP2001140158

    申请日：2001-05-10

    Applicant: ST MICROELECTRONICS SA

    Inventor： WUIDART LUC

    IPC: H04B5/02 ,  G06K7/00 ,  H04B1/59

    Abstract: PROBLEM TO BE SOLVED: To provide a method for reducing a time required to initialize and set up communication between a read/write terminal for electromagnetic transponders and the one transponder entering a field of the terminal or more, that is, to provide a method for decreasing consecutive times required for the read/write terminal, in order to decide and identify all the transponders present in the terminal field at a specific time. SOLUTION: This invention provides the method for establishing communication between devices that include the terminal, which is adapted so as to cooperate with the transponder, when at least the one transponder enters the terminal field and uses an oscillation circuit to generate a high-frequency electromagnetic field, a circuit that adjusts a signal phase of the oscillation circuit with respect to a reference value, and a circuit that evaluates a minimum number of the transponders present in the field, on the basis of the measurement of a current of the oscillation circuit.

    ELECTROMAGNETIC TRANSPONDER OPERATING BY VERY CLOSE COUPLING
    22.
    发明专利
    ELECTROMAGNETIC TRANSPONDER OPERATING BY VERY CLOSE COUPLING 失效

    公开(公告)号：JP2000341884A

    公开(公告)日：2000-12-08

    申请号：JP2000104893

    申请日：2000-04-06

    Applicant: ST MICROELECTRONICS SA

    Inventor： WUIDART LUC ,  BARDOUILLET MICHEL ,  ENGUENT JEAN-PIERRE

    IPC: G08C17/00 ,  G01S13/75 ,  G01S13/76 ,  G01S13/79 ,  G06K7/00 ,  G06K17/00 ,  G06K19/07 ,  H02J17/00

    Abstract: PROBLEM TO BE SOLVED: To attain reduction in thermal effect related to remote power supply to a transponder through a readout/writing terminal, by detuning a transponder oscillating circuit when the transponder has a very close coupling relation to the readout/writing terminal. SOLUTION: This transponder 30 is constituted of a parallel oscillating circuit including an inductance L2 and a capacitor C2' between two terminals 11', 12' of the circuit. Between the terminals 11', 12', a capacitor C3 and a switch (for example, MOS transistor) K1 are serially connected. A switch K1 is controlled by a circuit 31 and is closed at the time of tuning operation. When it is in a closely coupled condition with the terminal, or respective antennas are positioned at a distance of less than 2 cm, for example, the oscillating circuit of the transponder is detuned (the switch K1 is off). It is thus possible to prevent heat generation of the transponder in radio-supplying operating power to the transponder approaching the terminal from the terminal.

    DUPLEX TRANSMISSION METHOD FOR ELECTROMAGNETIC TRANSPONDER SYSTEM
    23.
    发明专利
    DUPLEX TRANSMISSION METHOD FOR ELECTROMAGNETIC TRANSPONDER SYSTEM 失效

    公开(公告)号：JP2000332647A

    公开(公告)日：2000-11-30

    申请号：JP2000104892

    申请日：2000-04-06

    Applicant: ST MICROELECTRONICS SA

    Inventor： WUIDART LUC ,  BARDOUILLET MICHEL ,  ENGUENT JEAN-PIERRE

    IPC: G06K19/07 ,  G06K7/00 ,  G06K17/00 ,  H04B1/59 ,  H04B5/02

    Abstract: PROBLEM TO BE SOLVED: To provide a method for duplex transmission between a terminal and a transponder in an electromagnetic transponder system. SOLUTION: Each of the terminal 40 and the transponder 10 is provided with an oscillation circuit 24, a modulation means and a demodulation means, the amplitude modulation transmission of a signal to be transmitted from the terminal 40 to the transponder 10 and the transmission of a signal from the transponder 10 to the terminal 40 and suited so as to follow the phase demodulation of the terminal 40 are simultaneously executed and an amplitude modulation rate is

    DETECTION OF A VARIATION IN DISTANCE RELATIVE TO AN AXIS OF ROTATION
    24.
    发明申请
    DETECTION OF A VARIATION IN DISTANCE RELATIVE TO AN AXIS OF ROTATION 审中-公开
    检测相对于旋转轴的距离变化

    公开(公告)号：WO2009138687A3

    公开(公告)日：2010-02-11

    申请号：PCT/FR2009050783

    申请日：2009-04-28

    Applicant: ST MICROELECTRONICS ROUSSET ,  WUIDART LUC

    Inventor： WUIDART LUC

    IPC: G01P3/44 ,  G01B7/02 ,  G01B7/24

    CPC classification number: G01B7/023 ,  B60C23/0413 ,  B60C23/068 ,  G01B7/24

    Abstract: The invention relates to a method for detecting a variation in distance relative to an axis of at least one point of an object rotating around said axis by a terminal (1) in a position that is stationary relative to the axis (41) and capable of emitting a radiofrequency field to at least one resonant circuit (2) attached to the object. Said method includes the steps including measuring and recording, on the terminal side, a maximum value of a quantity representative of the coupling of an oscillating circuit of the terminal and said at least one resonant circuit; and detecting a variation in said periodic maximum.

    Abstract translation: 本发明涉及一种用于通过端子（1）在相对于轴线（41）固定的位置中检测相对于围绕所述轴线旋转的物体的至少一个点的距离的变化的方法，并且能够 向连接到对象的至少一个谐振电路（2）发射射频场。 所述方法包括以下步骤：在终端侧测量和记录表示终端的振荡电路与所述至少一个谐振电路的耦合的量的最大值; 以及检测所述周期性最大值的变化。

    28.
    发明专利
    未知

    公开(公告)号：DE60315399D1

    公开(公告)日：2007-09-20

    申请号：DE60315399

    申请日：2003-10-16

    Applicant: ST MICROELECTRONICS SA

    Inventor： WUIDART LUC

    IPC: G11C17/16 ,  G01C22/02 ,  G11C7/06

    Abstract: The monotonic counter is implemented as an integrated circuit where each counting bit (B1,B2,B3,B4) is provided by a memory cell (11) containing at least one memory element constituted of a resistor of polycrystalline silicon which is programmable by an irreversible decrease of its resistance. The counter also comprises a circuit (30) for decoding the states of memory cells for obtaining the resultant count. The programming of the resistor of polycrystalline silicon is by a temporary passage of a constraint current which is higher than a current for which the resistance has the maximum value. Each counting cell comprises a programming resistor connected between a first supply terminal and a differential read terminal, and at least one programming interrupter connecting the read terminal to a second supply terminal. The programming resistor is in the form of two resistors of polycrystalline silicon which are identical in size and doping level. The counter also comprises a circuit for programming control (CTRL) of each counting cell and for providing control signals to each programming interrupter. The four bits (B1,B2,B3,B4) are arranged in a line of cells (11) which are all read simultaneously for obtaining the outputs (S1,S2,S3,S4). The number of cells in the state 0 and the state 1 is detected by the decoding circuit (30) which has five counting outputs (C0,C1,C2,C3,C4) linked to the four inputs by a NAND gate (31), nine AND gates (32,33,34,35,36,37,38,39,40), two OR gates (41,42), and a NOR gate (43).

    VERROUILLAGE D'UN CIRCUIT INTEGRE
    29.
    发明专利
    VERROUILLAGE D'UN CIRCUIT INTEGRE 未知

    公开(公告)号：FR2875949A1

    公开(公告)日：2006-03-31

    申请号：FR0452183

    申请日：2004-09-28

    Applicant: ST MICROELECTRONICS SA

    Inventor： WUIDART LUC ,  MARINET FABRICE

    IPC: H01L23/58 ,  G11C7/24 ,  H01L27/02

    Abstract: L'invention concerne la protection d'un circuit intégré en conditionnant le démarrage de tout ou partie du circuit à la présence d'une clé (KEY), enregistrée de façon non volatile dans le circuit postérieurement à sa fabrication et dépendant d'au moins un premier paramètre (A, ID) présent de façon non volatile dans le circuit à l'issue de sa fabrication.

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