Abstract: An actuator, comprising at least one beam capable of generating flexural oscillations, at least one pair of electric supply terminals (23, 24) which supply oscillation-inducing electric power to the beam(s), and a holding mechanism which holds the beam(s), the holding mechanism including at least one holding member (12) to hold one portion of the beam(s) and a case (13) jointed to the holding member and configured to contain the beam(s) therein.

Abstract: An actuator, comprising a beam (2) including a laminated structure which has piezoelectric layers (30, 31, 32) and electrode layers (20, 21, 22, 23), a holding mechanism to hold the beam, a feeding terminal (10) to supply an exciting power to the electrode layers of the beam, and a contact mechanism provided in the holding mechanism, the holding mechanism comprising a case (1) including a space (5) to house the beam (2) and a holding part to hold at least one of an end and a central portion of the beam (2), the contact mechanism being configured to contact with a part of the beam (2) and prevent the beam from excessively deflecting when a great impact is added to the beam.

Abstract: A surface-mounted electromagnetic sound generator includes a yoke accommodated inside a case, a coil attached to the yoke, a ring-shaped magnet placed about the coil, a vibration plate disposed to oppose the yoke and a plurality of surface-mounted electrodes. The underside of the magnet is provided with a plurality of recesses at symmetrical positions thereof, each recess extending through the magnet in tunnel-like fashion from the inner circumferential surface to the outer circumferential surface of the magnet. Terminals of the coil are connected to respective ones of the electrodes in respective ones of the recesses of the magnet. Thus the connections fall within the space occupied by the magnet.