Dynamic vibration absorber

A dynamic vibration absorber comprising:

• a movable portion including a movable weight portion;
• a movable portion magnet assembly comprising a plurality of rectangular magnets magnetized in a vertical direction and longitudinally and laterally disposed on a horizontal surface of the movable weight portion, in an installed state, through a back yoke, with a predetermined distance therebetween so that adjacent magnets have opposite poles;
• a fixed portion fixed to an object to be damped;
• a fixed portion magnet assembly comprising a plurality of fixed portion magnets having the same shape as that of the movable portion magnet assembly and longitudinally and laterally disposed to the object to be damped through a back yoke, with a predetermined distance therebetween so as to oppose the movable portion magnet assembly with poles of opposite polarity than those of the movable rectangular magnets;
• a magnetic flux created by the opposing, opposite polarity magnets being perpendicular to a relative movement between the movable portion magnet assembly and the fixed portion magnet assembly;
• a conductor plate disposed between the opposing, opposite polarity poles of the movable portion magnet assembly and the fixed portion magnet assembly so as not to be in contact therewith;
• a movable portion bearing receiving seat disposed to the movable weight portion;
• a fixed portion bearing receiving seat disposed to the object to be damped;
• and
• rigid balls held between the movable portion bearing receiving seat and the fixed portion bearing receiving seat to permit the movable weight portion to be horizontally movable.