Vibrating actuator with two resonant frequencies and two moving parts

A method for manufacturing a vibrating actuator, comprising the following steps:

• assembling a first moving part having an arrangement of magnets comprising at least two magnets, wherein the like poles of the magnets face each other and wherein the arrangement of magnets has two outer poles;
• assembling a second moving part having at least one coil such that the coil is wound over the arrangement of at least two magnets;
• assembling a chassis formed by two parts, such that each part of the chassis has a first elastic member and a second elastic member, wherein each of the first elastic member and the second elastic member face one of the two outer poles, wherein:
• the first moving part has a first resonant frequency, based on a mass of the first moving part and an elastic constant of the first elastic member, and the second moving part has a second resonant frequency, based on a mass of the second moving part and an elastic constant of the second elastic member, such that the vibrating actuator is configured to operate with two substantially different resonant frequencies;
• and
• attaching the first elastic member to the first moving part and attaching the second elastic member to the second moving part.