Patent ID: 7571648

Claim:
An angular velocity sensor, comprising: a quartz substrate in a flat plate shape being cut out from quartz single crystal rotated by a range of zero to one hundred eighty degrees around an X-axis from a crystal coordinate system (X, Y, Z) to a coordinate system (X, Y′, Z′) so that a main surface is parallel with respect to the X-axis and a Z′-axis of the coordinate system (X, Y′, Z′); a protrusion monolithically formed with the quartz substrate on the main surface so as to protrude in a Y′-axis direction and extend in an X-axis direction; an excitation electrode and a detection electrode formed adjacent to the protrusion on the main surface, wherein vibration is excited at the protrusion by exciting thickness-shear vibration in the X-axis direction on a portion having the excitation electrode and the detection electrode formed on the quartz substrate by an electric field applied to the excitation electrode, and the protrusion is bent by Coriolis force acting corresponding to a rotation around a Y′-axis, and displacement thereof is transmitted to the quartz substrate, so that the detection electrode detects change of stress applied to the quartz substrate.