Angular velocity sensor
AssigneeMurata Manufacturing Co., Ltd.
InventorsKatsumi Fujimoto, Keiichi Okano, Kohichi Murohashi
Life of this patent
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Abstract
An angular velocity sensor includes a vibrator. A differential amplifier circuit outputs a differential signal including a Coriolis component from the vibrator. The differential signal is converted into a digital signal by an A/D converter. A Hilbert transformer shifts the differential signal by π/2. Two multipliers squares the original differential signal and the π/2-phase-shifted differential signal, respectively, and an adder computes the sum of the squares. A square root circuit computes the square root of the sum and outputs a magnitude signal proportional to Coriolis force.
Claims17
An angular velocity sensor for driving a vibrator in an X-axis direction and for detecting angular velocity based on vibrations caused by a Coriolis force generated in a Y-axis direction when said vibrator rotates about a Z-axis, said angular velocity sensor comprising:
- a vibrator outputting a left signal and a right signal;
- a drive circuit connected to the vibrator;
- a converter connected to the vibrator for digitizing said left signal and said right signal;
- and
- an arithmetic operation unit for generating π/2 phase shifted signals and computing and outputting a magnitude of the Coriolis force based on the left and right signals and on the π/2 phase shifted signals.
An angular velocity sensor for driving a vibrator in an X-axis direction and for detecting angular velocity based on vibrations caused by a Coriolis force generated in a Y-axis direction when said vibrator rotates about a Z-axis, said angular velocity sensor comprising:
- a vibrator outputting a left signal and a right signal;
- a drive circuit connected to the vibrator;
- and
- an arithmetic operation unit connected to the vibrator to obtain said left signal and said right signal, wherein the arithmetic operation unit computes and outputs the magnitude of the Coriolis force based on said left signal and said right signal.
Dependencies are inferred from the claim text.