Multiple-function convertor for converting electric signals to vibration of elements of a portable electronic instrument

A multi-function convertor for a portable electronic instrument comprising:

• a case for mounting components of the electronic instrument;
• a vibrating plate securely mounted in the case at one of axial ends of the case;
• an annular first coil secured to the vibrating plate;
• a magnetic circuit composition mounted in the case,
• the magnetic circuit composition comprising a yoke having a flange and a core formed on the flange, an annular magnet mounted on the flange of the yoke at one of poles thereof, and a top plate comprising an annular portion and a cylindrical portion projected from a peripheral portion of the annular portion, the annular portion being engaged with the other magnetic pole of the magnet;
• supporting means for resiliently supporting the magnetic circuit composition in the case;
• a coil holding plate secured to the case at the other axial end of the case;
• an annular second coil secured to the coil holding plate;
• the first coil being inserted in a first magnetic gap formed in the magnetic circuit composition at one of axial end sides thereof, and the second coil being inserted in a second magnetic gap formed in the magnetic circuit composition at the other axial end side thereof;
• means for independently applying electric exciting current to the first coil and second coil.