Vibration exciter

A vibration exciter comprising:

• a chassis;
• a magnet fixed to an interior portion of the chassis;
• an excitation unit which comes in contact with a work to vibrate the work;
• a vibration generating unit which is integral with the excitation unit, around which a coil is wound, and which generates a vibration cooperatively with the coil and the magnet;
• a vibration sensor which is installed on an excitation axis of the excitation unit and which detects a resonance vibration of the work that is being vibrated;
• a fixed plate which has an outer diameter larger than an outer diameter of the chassis;
• a plurality of shafts having one end side attached to the fixed plate;
• a moving plate which has an outer diameter larger than an outer diameter of the chassis, and which is provided with a through-hole in which the shafts are inserted;
• a support member which supports the excitation unit;
• a retaining plate which has a size larger than a size of the chassis such that an outer portion of the retaining plate extends beyond the chassis, and to which other end side of the plurality of shafts is fixed;
• a plurality of spring members each of which is inserted into the plurality of shafts, and one end contacts the moving plate and other end contacts the retaining plate, and
• vibration-proof members which retain the support member at three or more locations equidistant in a radial direction from the excitation axis of the excitation unit and spaced at regular intervals in a circumferential direction, and which are mechanically fixed to the chassis via the retaining plate by contacting a lower surface of the retaining plate at an outer side than the chassis, in such a state as to retain the support member.