Linear resonant actuator with elastic suspension system

A linear resonant actuator (LRA) with elastic suspension system, comprising:

• a movable structure, comprising a magnetic-permeable element and two magnets, with the two magnets disposed at two opposite sides of the magnetic-permeable element;
• a coil, surrounding the magnetic-permeable element;
• and
• an elastic suspension system, comprising:
• a first elastic sheet and a second elastic sheet the first elastic sheet comprising a first fixed portion, a first suspension portion and a first engaging portion, the first suspension portion being disposed between the first fixed portion and the first engaging portion and comprising a plurality of bends, the bends of the first suspension portion being greater than 90°, and the first engaging portion being disposed at one end of the movable structure;
• the second elastic sheet comprising a second fixed portion, a second suspension portion and a second engaging portion, the second suspension portion being disposed between the second fixed portion and the second engaging portion and comprising a plurality of bends, the bends of the second suspension portion being greater than 90°, and the second engaging portion being disposed at the other end of the movable structure;
• wherein the first elastic sheet and the second elastic sheet are symmetrical;
• and
• wherein the first suspension portion comprises:
• two first outward extensions and two first inward extensions;
• one of the first outward extensions extending outwards between the first fixed portion and the other first inward extension, with a bend between the one first outward extension and the first fixed portion;
• the other first outward extension extending outwards between the one first outward extension and one of the first inward extension, with a bend between the one first outward extension and the other first outward extension;
• one of the first inward extensions extending inwards between the other first outward extension and the other first inward extension, with a bend between the other first outward extension and the one first inward extension;
• the other first inward extension extending inwards between the one first outward extension and the first engaging portion, with a bend between the one first inward extension and the other first inward extension;
• wherein the second suspension portion comprises:
• two second outward extensions and two second inward extensions;
• one of the second outward extensions extending outwards between the second fixed portion and the other second outward extension, with a bend between the one second outward extension and the second fixed portion;
• the other second outward extension extending outwards between the one second outward extension and one of the second inward extensions, with a bend between the one second outward extension and the other second outward extension;
• one of the second inward extension extending inwards between the other second outward extension and the other second inward extension, with a bend between the other second outward extension and the one second inward extension;
• the other second inward extension extending inwards between the one second inward extension and the second engaging portion, with a bend between the one second inward extension and the other second inward extension;
• wherein an angle at the bend between the one first outward extension and the first fixed portion is equal to an angle at the bend between the one second outward extension and the second fixed portion;
• an angle at the bend between the two first outward extensions is equal to an angle at the bend between the two second outward extensions;
• the angle at the bend between the other first outward extension and the one first inward extension is equal to the angle at the bend between the other second outward extension and the one second inward extension;
• the angle at the bend between the two first inward extensions is equal to the angle at the bend between the two second inward extensions.