Patent ID: 7677100

Claim:
A composite sensor comprising: a substrate; first supporting units provided on the substrate; a first vibrator facing the substrate with a gap therebetween; first supporting beams arranged to connect the first vibrator to the first supporting units and to support the first vibrator such that the first vibrator can vibrate in an X-axis direction among three axial directions including X, Y, and Z axes substantially perpendicular to each other; an angular-velocity-detecting vibrator provided to the first vibrator; angular-velocity-detecting supporting beams arranged to connect the angular-velocity-detecting vibrator to the first vibrator and to support the angular-velocity-detecting vibrator such that the angular-velocity-detecting vibrator can be displaced in one of the Y-axis direction and the Z-axis direction; a vibration generator enabling the first vibrator to vibrate in the X-axis direction; an angular-velocity-detecting displacement detector arranged to detect an amount of displacement when the angular-velocity-detecting vibrator is displaced in the one of the Y-axis direction and the Z-axis direction in a state in which the first vibrator is vibrating in the X-axis direction; second supporting units provided on the substrate; a second vibrator facing the substrate with a gap therebetween; second supporting beams connecting the second vibrator to the second supporting units and supporting the second vibrator such that the second vibrator can be displaced in one of the X-axis direction and the Y-axis direction; an acceleration-detecting displacement detector provided between the first and second vibrators and being arranged to detect an amount of displacement when the second vibrator is displaced in the one of the X-axis direction and the Y-axis direction; a vibration monitor arranged to monitor displacement of the first vibrator when the first vibrator vibrates in the X-axis direction; and an acceleration detector arranged to detect acceleration that acts on the second vibrator by performing synchronous detection on a displacement detection signal from the acceleration-detecting displacement detector using a monitor signal from the vibration monitor.