ANGULAR VELOCITY SENSOR AND ANGULAR VELOCITY SENSOR SYSTEM

A controller applies a predetermined voltage to a fixed part detection excitation electrode to vibrate a movable part in a second direction and simultaneously applies a predetermined voltage to a fixed part drive electrode to vibrate the movable part in a first direction. The controller acquires, of the movable part, a first resonance frequency along the first direction and a second resonance frequency along the second direction. The controller controls a drive spring adjustment part to adjust a spring constant of the drive spring, such that the first resonance frequency is maintained constant, and controls a detection spring adjustment part to adjust a spring constant of the detection spring such that the second resonance frequency is maintained constant. The controller detects the angular velocity based on a result of synchronously detecting signal from the fixed part detection electrode with the first resonance frequency.