Patent ID: 9151612
Filing Date: 2015-10-06
Classification: G01C,H01L

Abstract:
1. A vibrating gyroscope comprising: a ring-shaped vibrating body having a uniform plane; leg portions flexibly supporting the ring-shaped vibrating body; and a plurality of electrodes disposed on the plane of or above the ring-shaped vibrating body, and formed with at least one of an upper-layer metallic film, at least one of a lower-layer metallic film, and at least one of a piezoelectric film being sandwiched between the upper-layer metallic film and the lower-layer metallic film in a thickness direction thereof; wherein when N is a natural number of 2 or more, the plurality of electrodes include: a group of driving electrodes for exciting a primary vibration of the ring-shaped vibrating body in a vibration mode of cos Nθ, the driving electrodes being disposed (360/N°) apart from each other in a circumferential direction; a detection electrode for detecting a secondary vibration generated upon application of an angular velocity to the ring-shaped vibrating body, the detection electrode being disposed (90/N°) apart clockwise or counterclockwise from one of the driving electrodes; and a suppression electrode for suppressing the secondary vibration in accordance with a voltage signal outputted from the detection electrode, the suppression electrode being disposed (90/N°) apart clockwise or counterclockwise from one of the driving electrodes or being disposed (180/N°) apart from the detection electrode; and the driving electrodes, the detection electrode, and the suppression electrode are disposed in a region from an outer peripheral edge of the ring-shaped vibrating body to a vicinity of the outer peripheral edge or a region from an inner peripheral edge thereof to a vicinity of the inner peripheral edge, and some of the leg portions are provided thereon with metal tracks that are electrically connected to the driving electrodes, the detection electrode, and the suppression electrode, respectively, wherein a first set of metal tracks are formed above the leg portions and are electrically connected to the corresponding first detection electrodes and are identical in number with second metal tracks that are electrically connected to the corresponding second detection electrodes, and wherein an arithmetic circuit obtains a difference between a signal output from each of the first set of metal tracks connected to the corresponding first detection electrodes and a signal output from each of the second set of metal tracks connected to the corresponding second detection electrodes.