Thales

André Boura

Bertrand Leverrier

Bernard Chaumet

Régis Quer

Olivier Lefort

In a laser gyroscope, an activation wheel has a polygonal cylindrical hub formed by continuous assembly of vertical walls, wherein two adjacent walls of the cylindrical hub between them form a dihedron. Each radial plate of the activation wheel is connected to the cylindrical hub along the edge of a dihedron. The walls are formed with bulging portions, serving for plane-to-plane fixing of one face of the tulip to an optical block, and thin parts allowing a radial displacement degree of freedom of the fixing parts relative to the rim when there is a differential thermal expansion between the tulip and activation wheel. The activation wheel may be produced in a material having a thermal expansion coefficient higher than the tulip, for example steel, with plane-to-plane fixing of the tulip to the activation wheel hub, advantageously by screws, the assembly effectively accommodating the thermal expansion differential between the two materials.

Fixing system for the optical block of a laser gyroscope

A micromachined accelerometer in a flat plate includes a base and at least two resonator measuring cells provided with a common mobile seismic element, the two measuring cells being placed one on each side of the common mobile seismic element along the sensitive axis of the accelerometer, such that under the effect of an acceleration, the resonator of one measuring cell undergoes a traction while the resonator of the other measuring cell undergoes a compression, the measuring cells respectively configured to amplify the acceleration force generating the translation of the common mobile seismic element provided with a respective anchoring foot-piece. The common mobile seismic element includes at least two mobile seismic masses able to be displaced in translation along the sensitive axis of the accelerometer and/or in rotation with respect to a respective axis of rotation substantially orthogonal to the sensitive axis under the effect of an acceleration along the sensitive axis.

Micro-machined accelerometer

A monolithic guiding blade for a mobile proof mass in a monolithic electromechanical system micro-machined in a plate having thickness H and defining plane O,x,y, the system including a base and a measurement cell including the proof mass connected to the base by the guiding blade and capable of translation displacement along axis Oy, the blade extending along axis Ox and connected to a fixed portion of the base, the blade limiting movement of the proof mass along axis Ox, comprising: a first hinge section shaped as a parallelepiped having thickness h long axis Oz, length Ialong axis Ox and width L along axis Oy; a central section essentially shaped as a parallelepiped having thickness h long axis Oz, length It along axis Ox and width Lt along axis Oy; and a second hinge section essentially in the shape of a parallelepiped having thickness h long axis Oz, length Ialong axis Ox and width L along axis Oy.

Growing community of inventors

Chatellerault, France

André Boura