Commissariat &#xc0; L'&#xc9;nergie Atomique Et Aux &#xc9;nergies Alternatives

Centre National De La Recherche Scientifique

Université Pierre Et Marie Curie

José Lozada

Vincent Hayward

Michaël Wiertlewski

Moustapha Hafez

Charles Hudin

Laurent Eck

Edouard Leroy

Florian Periquet

Xavier Boutillon

An ultrasonic motor comprising a rotor () having an at least partly spherical shape and two actuators (') each comprising an element of plate-shaped piezoelectric material comprising at least one contact edge (&#x2032;) in contact with the rotor (), said actuators (&#x2032;) also comprising on one of their faces electrodes intended to bias piezoelectric materials in a bending mode and in a longitudinal mode. The contact edges (&#x2032;) are concave and are formed by an arc of circle the radius of which substantially corresponds to the radius of the surface of the rotor (), said arcs of circle angularly extending at a determined angle such that the bending mode and the longitudinal mode in which the piezoelectric material is biased are at the same frequency.

Actuator for an ultrasonic motor and ultrasonic motor comprising at least one such actuator

Tactile stimulation interface comprising a support (), a flexible surface suspended on the support () intended to be tactilely explored by an operator, actuators () intended to apply a force on the flexible surface () and means for controlling the actuators (), the actuators being located on the contour of the flexible surface. The control means are intended to send, to the actuators (), signals corresponding to the forces to be applied to the flexible surface () according to the tactile stimulation to be generated on the flexible surface (), the forces being determined by a time-reversal method. The surface () comprises at least one sufficiently flexible area, for example of Mylar&#xae;, in order for the propagation speed of the waves thus generated to be slow enough to reach sufficiently short wavelengths at low frequencies, thereby substantially improving focusing at resolutions compatible with tactile stimulation.

Time-reversal tactile stimulation interface

A system for simulation of a contact with a surface by tactile stimulation including a surface that will come into contact with the digital pulp of a user's finger. The system includes means of displacing the surface along first and second directions (X, Y) orthogonal to each other and approximately tangent to the digital pulp of the finger. The displacement means are controlled as a function of the simulation to be generated, in which the displacement means are electromagnetic actuators.

System for simulating a contact with a surface by tactile simulation

Growing community of inventors

Massy, France

José Lozada