Abstract: The micro-electro-mechanical system is provided with at least two separate anchoring elements (F1, F2) designed to be bound to a support. A anchoring element (F1, F2) is solidly linked to at least one beam (P1, P2) that can be deformed in bending, and two beams (P1, P2) respectively linked to two distinct anchoring elements (F1, F2) have different directions. A beam has a length L, a thickness e, and a height h, such that the stiffnesses KL in the directions of the length and of the height Kh are large and the stiffness in the direction of the thickness Ke is small.

Abstract: 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.

Abstract: A laser gyro includes an amplifying solid element and a device for vibrating said amplifying solid element at a predetermined frequency, along an axis of revolution of said amplifying solid element. The geometry of said amplifying solid element is such that a natural mode of mechanical vibration of said amplifying solid element corresponds to said predetermined frequency.

Abstract: The micro-electro-mechanical system is provided with at least two separate anchoring elements (F1, F2) designed to be bound to a support. A anchoring element (F1, F2) is solidly linked to at least one beam (P1, P2) that can be deformed in bending, and two beams (P1, P2) respectively linked to two distinct anchoring elements (F1, F2) have different directions. A beam has a length L, a thickness e, and a height h, such that the stiffnesses KL in the directions of the length and of the height Kh are large and the stiffness in the direction of the thickness Ke is small.

Abstract: 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.

Abstract: 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 I1 along 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 I2 along axis Ox and width L along axis Oy.

Abstract: 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.

Abstract: A laser gyro includes an amplifying solid element and a device for vibrating said amplifying solid element at a predetermined frequency, along an axis of revolution of said amplifying solid element. The geometry of said amplifying solid element is such that a natural mode of mechanical vibration of said amplifying solid element corresponds to said predetermined frequency.

Abstract: The invention pertains to the field of micro-machined electromechanical systems including a proof mass capable of displacement.

Abstract: The invention relates to a micromachined accelerometer in a flat plate comprising 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 whilst the resonator of the other measuring cell undergoes a compression, said measuring cells respectively comprising means of amplification of the acceleration force generating the translation of the common mobile seismic element provided with a respective anchoring foot-piece.

Abstract: In the disclosed laser gyrometer, the three resonant optical cavities of the block are connected to a cathode chamber by means of the three cathode capillary tubes and to a balancing chamber by means of three balancing capillary tubes. The axis of the cathode is identified with the axis of actuation. The block is actuated by means of an actuating ring in thermal contact with the cathode so as to provide for dissipation of the heat generated at the cathode. The invention makes it possible to solve the problems relating to wobble (or lack of dynamic balance) as well as thermal gradients.

Abstract: A device for magnetically centering, with respect to a reference axis, a second body mobile relative to a first body includes a magnetic bearing that is active along the reference axis. It further includes two magnetic centering devices offset axially along that axis, on opposite sides of the magnetic bearing.

Abstract: An accelerometric sensor according to the invention comprises a plane pendulum structure presenting a test body suspended to a fixed part by at least two parallel blades, flexible in the plane of the said test body, in order to be able to move in translation in the said plane according to a sensitive axis perpendicular to the said blades. This test body comprises a moving support element linked to the said flexible blades and a test mass suspended to the said support element by at least a third and fourth blade parallel to the preceding ones and flexible in the plane of the said test body. The invention enables to reduce substantially the sensitivity to the transverse acceleration of the detection structure when it is submitted to an acceleration directed according its sensitive axis S.

Abstract: An accelerometer is provided using at least one sensor with flat pendular structure formed by micro-machining a fine monocrystal wafer and comprising a flat mobile mass suspended from the rest of the structure by means of two thin parallel strips situated on each side of the mass. The mass comprises at least one mobile capacitor plate disposed between two fixed capacitor plates provided on the fixed part of the structure. The mobile plate is brought to a voltage V.sub.O, whereas the fixed plates are respectively brought to voltages V.sub.1 and V.sub.2 which are capable of generating an electrostatic return force on the mobile mass.