Patent ID: 8689630

Claim:
An inertial force sensor comprising: a mass section; a plurality of orthogonal arms formed by connecting a first arm and a second arm in an orthogonal direction; an excitation section configured to excite the mass section at an excitation frequency; a detecting section configured to output a signal corresponding to displacement of the mass section along at least one of a first direction and a second direction inclined to the first direction, wherein the first arms of the plurality of orthogonal arms are mutually connected, and the mass section is formed at a tip of the each second arm, resonance frequencies of the first direction and the second direction are set greater than the excitation frequency, a drive section is connected to the excitation section, and configured to input a drive signal to the excitation section, and a processing circuit is connected to the detecting section, and configured to detect displacement of the mass section along the first direction and the second direction based on the signal output from the detecting section, wherein, the processing circuit is configured to output a first signal corresponding to the displacement of the mass section along the first direction during a first period, and output a second signal corresponding to the displacement of the mass section along the second direction during a second period different from the first period.