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    • 22. 发明专利
    • Accelerometer
    • AU2002353816A1
    • 2003-05-06
    • AU2002353816
    • 2002-10-16
    • KIONIX INC
    • JOHNSON WENDY JO HMILLER SCOTT AADAMS SCOTT G
    • G01P9/04G01P15/125G01P15/08H01L29/00
    • An accelerometer. A silicon wafer is etched to form a fixed portion, a movable portion, and a resilient coupling between, the fixed and movable portions generally arranged in the plane of the wafer, the mass of the movable portion being concentrated on one side of the resilient coupling. One of the fixed and moveable portions of the silicon structure includes a first electrode. The other of the fixed and moveable portions includes a second electrode oriented parallel to the axis of acceleration, and an electrically-conductive layer electrically connected as a third electrode coplanar and mechanically coupled with the second electrode. The second and third electrodes are arranged in capacitive opposition to the first electrode, the capacitance between the first electrode and third electrode increasing as the movable portion moves in a direction along the axis of acceleration relative to the fixed portion and decreasing as the movable portion moves in an opposite direction. A resilient coupling retains the first and third electrodes in capacitive opposition to each other across a capacitance gap while allowing motion of the first electrode relative to the second and third electrodes in response to acceleration along an axis of acceleration perpendicular to the plane of the wafer, and resiliently restores the first electrode to an equilibrium position when the acceleration ceases. The second electrode is in opposition to a majority of the surface area of the first electrode when the electrodes are in the equilibrium position. Capacitance between the first and third electrodes is measured to obtain a measurement of acceleration along the axis.
    • 29. 发明申请
    • SYSTEM AND METHOD FOR DETECTION OF FREEFALL WITH SPIN USING TWO TRI-AXIS ACCELEROMETERS
    • 使用两个三轴加速度计检测旋转的系统和方法
    • WO2008121739A8
    • 2010-02-18
    • PCT/US2008058522
    • 2008-03-27
    • KIONIX INCKIM DONG YOONMILLER SCOTT A
    • KIM DONG YOONMILLER SCOTT A
    • G01P15/18
    • G01P15/0891G11B19/043
    • A system (10) and method detect freefall associated with an object that is spinning or tumbling as it falls. Two tri-axis accelerometers (14, 16) provide inputs to an algorithm (28) that detects the freefall of a spinning object that would not otherwise be detected by a conventional freefall detection system, due to the centrifugal and centripetal forces being placed on the falling object as it spins. The system can be used to detect the freefall of portable devices with onboard memory or hard disk drives, allowing the devices to have time to park the read/write head and reduce the potential of losing data that can be damaged by impact. This freefall detection system may be applied to such portable devices as notebook computers, PDAs, MP3 players, digital cameras, mobile phones and even automobiles.
    • 一种系统(10)和方法,用于检测与下降时正在旋转或翻滚的对象相关联的自由落体。 两个三轴加速度计(14,16)为算法(28)提供输入,该算法(28)检测纺丝物体的自由落体,由于离心力和向心力被放置在 坠落的物体,因为它旋转。 该系统可用于检测具有板载内存或硬盘驱动器的便携式设备的自由落体,从而允许设备有时间停放读/写头,并减少丢失可能受到影响而损坏的数据的可能性。 这种自由落体检测系统可以应用于诸如笔记本电脑,PDA,MP3播放器,数码相机,移动电话甚至汽车的便携式设备。