Patent ID: 6116087
Filing Date: 2000-09-12
Classification: G01C

Abstract:
An angular velocity sensor comprising:an oscillator having a pair of arms, each arm having a main surface and extending parallel to the other arm of the pair;a driving element configured for oscillating said oscillator in a direction of an X-axis in a three-axis rectangular coordinate system defined by said X-axis, a Y-axis and a Z-axis;a pair of detecting elements, each detecting element being respectively formed on one region of said main surface of one arm of the pair of arms, the pair of detecting elements being configured for generating signals in accordance with an oscillating state of said oscillator in a direction of either one of said Y-axis and said Z-axis;a pair of feedback elements, each feedback element being respectively formed on another region of said main surface of one arm of the pair of arms, the pair of feedback elements being configured for generating signals in accordance with an oscillating state of said oscillator in a direction of said Y-axis; anda circuit unit configured (i) for driving said driving element based on said signals generated from said pair of feedback elements, and (ii) for outputting an angular velocity signal by carrying out synchronous detection of said signals generated from said pair of detecting elements with respect to said signals from said pair of feedback elements, while said oscillator is oscillated in a direction of said X-axis,wherein electrostatic capacitances of said feedback elements are substantially equal to electrostatic capacitances of said detecting elements.