Patent ID: 9052218
Filing Date: 2015-06-09
Classification: G01D

Abstract:
1. Microtechnology device, comprising: an actuator, designed to move a moving element relative to a support, this moving element comprising a permanent magnet, a first magnetic sensor (C1) designed to detect a movement of the magnet, characterized in that the actuator is designed to move a movable element in two degrees of freedom from a resting position, the permanent magnet is chosen to have a magnetic field distribution that presents a main plane of symmetry and a main direction of magnetization (AA) passing through a centre (O), the first sensor (C1) is placed substantially in the said main plane of symmetry, at a first working distance from the magnet, whereas a working axis (z) of this first sensor (C1) is substantially perpendicular to the main direction of magnetization (AA), and passes substantially through the centre (O), in the resting position of the magnet, a second magnetic sensor (C2) is provided, placed substantially in the main plane of symmetry of the magnetic field, at a second working distance from the magnet, whereas the working axis (y) of this second sensor is substantially parallel to the main direction of magnetization (AA), in the resting position of she magnet, the second sensor (C2) is positioned close to an extremum, for said second working distance, the said extremum being located at a position for which the component on the working axis (y) of the gradient (dBy/dz) of the component over the main direction of magnetization (AA) is at its maximum, the first and second sensors then being sensitive to the movements of the movable element perpendicularly to their respective working axes, wherein the second sensor (C1) is positioned on the surface of a sphere centered substantially on said centre (O) and having a radius of between 500 μm and 2000 μm.