Patent ID: 8885169
Filing Date: 2014-11-11
Classification: G01C

Abstract:
1. An optical gyroscope, comprising: an optical block fixed by bonding to fixing pads provided on a face of a one-part ring shape piece called a tulip, and a one-part activation wheel made of a material having a thermal expansion coefficient higher from that of the tulip, the activation wheel comprising an outer rim and an axially symmetric cylindrical inner hub, connected to the outer rim by plane radial plates that are distributed around the hub, wherein the cylindrical hub is a faceted hub structure formed by a continuous assembly of several plane walls distributed about the axis of the cylinder and parallel to this axis, such that each of two adjacent walls of the cylindrical hub together form a dihedron, and a corresponding radial plate of the activation wheel is connected to the cylindrical means along the edge of this dihedron, each wall of the hub comprising at least one bulging portion and one thinned portion, each of the bulging portions of the hub offering a disc-shape fixing part serving for the plane-to-plane fixing of another face of the tulip and the thinned portions allowing a radial displacement degree of freedom of the fixing part relative to the rim when there is a differential thermal expansion between the tulip and the activation wheel, while keeping translation and tilting stiffness of the optical block/tulip assembly with respect to the rim of the dithering wheel.