Method and unit for sensing physical quantity using...

Details Method and unit for sensing physical quantity using... Method and unit for sensing physical quantity using...

2007-01-30

2007-01-30

Williams, Hezron (Department: 2856)

Measuring and testing

Speed, velocity, or acceleration

Acceleration determination utilizing inertial element

Reexamination Certificate

active

10895978

ABSTRACT:
A physical quantity (e.g., acceleration) sensing unit is provided. In this unit, a capacitive sensor has first and second fixed electrodes and a physical-quantity-sensitive movable electrode disposed between the first and second fixed electrodes. An adjusting circuit first adjusts a first bias voltage applied between the first fixed electrode and the movable electrode and a second voltage applied between the movable electrode and the second fixed electrode so that the movable electrode is brought into contact with either the first or second fixed electrode. The adjusting circuit then adjusts the first and second bias voltages to return the movable electrode to its original position. A detecting circuit detects an output on a capacitance relationship among the first and second fixed electrodes and the movable electrode. The output is subjected to determination of whether or not the output is out of order, when tested.

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patent: 2002-40047 (2002-02-01), None

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