Vibrating device comprising embedded mechanical reflectors for defining an active plate mode propagation area and mobile apparatus comprising the device

A vibrating device comprising:

• a first support configured to be deformed having a surface defined in a plane in directions X and Y, said first support comprising at least one defect with respect to the propagation of the plate modes, said defect being of geometrical nature or corresponding to a structural heterogeneity;
• at least one actuator configured to generate plate modes being propagated in said first support;
• a second support;
• at least one embedded mechanical reflector in contact with said first support, the at least one embedded mechanical reflector is secured to said first support such that the first support is immobilized in at least one direction Z at right angles to said directions X and Y, said mechanical reflector being secured to said second support, wherein
• said embedded mechanical reflector being configured to isolate an active zone belonging to said surface defined in a plane in directions X and Y in which the plate modes are propagated, said active zone excluding said defect,
• said actuator being situated in said active zone,
• said embedded mechanical reflector is in contact on at least a first surface with the first support and on at least a second surface with the second support, the first and second surfaces of the embedded mechanical reflector are elongated, and
• the first support including a bottom surface defined in a plane in directions X and Y and the second support including a top surface defined in a plane in directions X and Y that faces the bottom surface of the first support, the embedded mechanical reflector being secured to each of the bottom surface of the first support and the top surface of the second support.