Patent ID: 6539804
Filing Date: 2003-04-01
Classification: G01C

Abstract:
A two-axis yaw rate sensor comprising:a ring-shaped member; wherein the ring-shaped member includes first to fourth vibrating drive surfaces located in order in a circumferential direction and support parts located between the adjacent drive surfaces, wherein the first and the third drive surfaces are opposed to one another on a first axis passing through the center oft he ring-shaped member, the second and the fourth drive surfaces, are opposed to one another on a second axis passing through the center of the ring-shaped member, the second axis being substantially perpendicular to the first axis; a support member for supporting the ring-shaped member at each support part; a piezoelectric member, which is located on each drive surface and vibrates the corresponding drive surface in a radial direction of the ring-shaped member; a coupling portion extending from each drive surface; a weight, which is coupled to each coupling portion and moves in a direction substantially perpendicular to the vibrating direction of the drive surfaces wherein each weight is located in a middle portion of the corresponding drive surface and extends radially outward relative to the center of the ring-shaped member; and a deformation detection member formed on each coupling portion for detecting the deformation of the corresponding coupling portion.