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    Capacitive distance sensor
    1.
    发明公开
    Capacitive distance sensor 有权
    Kapazitiver Abstandssensor

    公开(公告)号：EP0942259A1

    公开(公告)日：1999-09-15

    申请号：EP99301681.5

    申请日：1999-03-05

    Applicant: STMicroelectronics, Inc.

    Inventor： Tartagni, Marco ,  Gupta, Bhusan ,  Kramer, Alan

    IPC: G01B7/287 ,  G01B7/004 ,  G06K9/00

    CPC classification number: G01B7/023 ,  G01B7/004 ,  G01B7/287 ,  G01B7/34 ,  G06K9/0002

    Abstract: A distance sensor has a capacitive element in turn having a first capacitor plate which is positioned facing a second capacitor plate whose distance is to be measured. In the case of fingerprinting, the second capacitor plate is defined directly by the skin surface of the finger being printed. The sensor comprises an inverting amplifier, between the input and output of which the capacitive element is connected to form a negative feedback branch. By supplying an electric charge step to the input of the inverting amplifier, a voltage step directly proportional to the distance being measured is obtained at the output.

    Abstract translation: 距离传感器具有电容元件，其依次具有第一电容器板，该第一电容器板面对要测量距离的第二电容器板。 在指纹识别的情况下，第二电容器板由被打印的手指的皮肤表面直接限定。 传感器包括反相放大器，其输入和输出之间电容元件连接以形成负反馈支路。 通过向反相放大器的输入端提供电荷步骤，在输出端获得与测量距离成正比的电压阶跃。

    Semiconductor variable capacitor and method of making same
    2.
    发明公开
    Semiconductor variable capacitor and method of making same 有权
    Variabler Halbleiterkondensator和Herstellungsverfahren

    公开(公告)号：EP0928959A2

    公开(公告)日：1999-07-14

    申请号：EP99300189.0

    申请日：1999-01-12

    Applicant: STMicroelectronics, Inc.

    Inventor： Kalnitsky, Alexander ,  Kramer, Alan ,  Fabbrizio, Vito ,  Gozzini, Giovanni ,  Gupta, Bhusan ,  Sabarini, Marco

    IPC: G01L9/12 ,  G01P15/125

    CPC classification number: G01L9/0072 ,  G01P15/0802 ,  G01P15/125 ,  H01G5/16

    Abstract: A variable capacitor in a semiconductor device is described in which the capacitance is varied by the movement of a dielectric material in the space between the plates of the capacitor in response to an external stimulus. A method of making such a variable capacitor is also described in which the capacitor is built in a layered structure with the top layer including a portion of dielectric material extending into the space between the capacitor plates. After formation of the top layer, an intermediate layer is etched away to render the top layer flexible to facilitate movement of the dielectric material in the space between the capacitor plates.

    Abstract translation: 描述了半导体器件中的可变电容器，其中电容由于外部刺激而在电容器的板之间的空间中的电介质材料的移动而变化。 还描述了制造这种可变电容器的方法，其中电容器内置在分层结构中，顶层包括延伸到电容器板之间的空间中的介电材料的一部分。 在形成顶层之后，蚀刻掉中间层以使顶层柔性以促进电介质材料在电容器板之间的空间中的移动。

    Capacitive semiconductor user input device
    4.
    发明公开
    Capacitive semiconductor user input device 审中-公开
    Kapazitives，Halbleiter verendendesBenutzereingabegerät

    公开(公告)号：EP0929028A3

    公开(公告)日：2000-10-25

    申请号：EP99300188.2

    申请日：1999-01-12

    Applicant: STMicroelectronics, Inc.

    Inventor： Kramer, Alan

    IPC: G06F3/00 ,  G06K11/16 ,  G06K11/18

    CPC classification number: G06F3/044 ,  G06F3/03547 ,  G06F3/0416 ,  G06F2203/0338

    Abstract: A method of and system for providing user input to a computer, or the like, having a display by detecting a change in fingerprint pattern of a user. The system controls the position of a pointer on a display by detecting motion of ridges and pores of a fingerprint of a user and moving the pointer on the display according to detected motion of the ridges and pores of the fingerprint. The system captures successive images of the fingerprint ridges and pores and detects motion of the ridges and pores based upon the captured successive images.

    Abstract translation: 一种用于通过检测用户的指纹图案的改变而向具有显示器的计算机等提供用户输入的方法和系统。 系统通过检测用户的指纹的脊和孔的运动并根据检测到的指纹的脊和孔的运动将指示器移动到显示器上来控制指示器在显示器上的位置。 系统捕获指纹脊和孔的连续图像，并基于捕获的连续图像检测脊和孔的运动。

    Enhanced fingerprint detection
    5.
    发明公开
    Enhanced fingerprint detection 有权
    改进的指纹调查

    公开(公告)号：EP1220139A3

    公开(公告)日：2005-08-31

    申请号：EP01310104.3

    申请日：2001-12-03

    Applicant: STMicroelectronics, Inc.

    Inventor： Kramer, Alan

    IPC: G06K9/20 ,  G01B7/287 ,  G01B7/34

    CPC classification number: A61B5/1172 ,  G01B7/287 ,  G06K9/0002

    Abstract: An enhanced fingerprint sensing circuit in which a voltage change is applied to the body during sensing. When the person's fingerprint is being sensed, the person's body is in contact with an electrical terminal. When the sensing occurs, the voltage on the electrical terminal changes, which changes the voltage on the person's body. The pattern of the fingerprint performs two functions in the sensing circuit. In addition to being a plate of a capacitor whose distance is being sensed, it is now a source of input charge as well. The electrical effect on the cell of a voltage change on a person's finger is different at a ridge than at a valley in the fingerprint sensing circuit. Thus, the input capacitance to the sensing circuit is variable, depending upon whether a ridge or a valley is present. The sensing circuit also detects a change in its own capacitance based on the presence of a ridge or a valley. In summary, the person's body acts as the input capacitor to provide a variable charge transfer for the input capacitance and at the same time performs the function of being a variable sensing capacitor value for the capacitive sensor. The fingerprint sensor is thus very sensitive and can detect a person's fingerprint even if a protective layer, such as plastic, wax paper or the like is over the sensor. In addition, if the person is wearing a thin glove, such as a latex glove, the fingerprint patterns can still be sensed.

    Command interface using fingerprint sensor input system
    6.
    发明公开
    Command interface using fingerprint sensor input system 有权
    与使用一个指纹输入系统的控制接口

    公开(公告)号：EP1113405A3

    公开(公告)日：2005-01-05

    申请号：EP00311522.7

    申请日：2000-12-21

    Applicant: STMicroelectronics, Inc.

    Inventor： Gupta, Bhusan ,  Kramer, Alan

    IPC: G07C9/00 ,  B60R25/00 ,  G06K9/00

    CPC classification number: B60R25/25 ,  B60R25/252 ,  G06K9/00006 ,  G07C9/00158 ,  G07C9/00563

    Abstract: In a fingerprint sensing system usable as a command interface a user's fingerprint pattern is recognized and compared to previously stored reference patterns. If the fingerprint pattern matches a previously stored pattern, the user is permitted to enter commands via the same interface system. In the case of an automobile, a user may identify themselves with their fingerprint, and then perform such functions as unlocking the doors, setting the seat to a selected location, or even pre-starting the car prior to their entering the automobile. The same devices which perform the fingerprint identification are also used for input sensing and command recognition to perform various commands. A user is thus able to control desired functions while being assured that an unauthorized user will not have access even if they were able to obtain the command interface device.

    Scanning capacitive semiconductor fingerprint detector
    9.
    发明公开
    Scanning capacitive semiconductor fingerprint detector 审中-公开
    AbtastfähigerHalbleiterfingerabdrukdetektor

    公开(公告)号：EP0929050A3

    公开(公告)日：2001-01-10

    申请号：EP99300181.7

    申请日：1999-01-12

    Applicant: STMicroelectronics, Inc.

    Inventor： Kramer, Alan ,  Brady, James

    IPC: G06K9/00

    CPC classification number: G06K9/0002

    Abstract: A scanning fingerprint detection system that includes an array of capacitive sensing elements. The array has a first dimension greater than the width of a fingerprint and a second dimension less than the length of a fingerprint. Each of the capacitive sensing elements has a size less than the width of a fingerprint ridge. Circuitry is provided for scanning the array to capture an image of a portion of fingerprint and for assembling the captured images into a fingerprint image as a fingerprint is moved over the array.

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