Patent ID: 7051592

Claim:
An angular velocity sensor comprising: a tuning-fork resonator having a pair of prongs arranged substantially parallel with each other, base ends of the prongs being fixed and constituting a base; a supporting substrate mounting the tuning-fork resonator so that a principal surface of the supporting substrate and a principal surface of the tuning-fork resonator are opposed to each other, the principal surface of the tuning-fork resonator being a surface defined by a longitudinal direction and a lateral direction of the prongs, the supporting substrate supporting the prongs at the base so that the prongs vibrate; and a casing accommodating the tuning-fork resonator by fixing the supporting substrate to the casing; wherein the supporting substrate has a first slit opening at one end substantially in the center of a side that is substantially perpendicular to the longitudinal direction of the prongs of the tuning-fork resonator, the first slit extending in the longitudinal direction of the prongs, and the first slit dividing the supporting substrate into substrate components corresponding to the prongs, and the substrate components are fixed to the casing at non-vibrating portions present in two sides of the substrate components, the two sides extending in the longitudinal direction of the prongs.