Abstract: Provided is a sound output apparatus including a functional mechanism that performs a specified function; an oscillation providing mechanism that oscillates, as an oscillation-provision-target member, a member included in the functional mechanism; and an oscillation controller that controls an oscillation operation performed by the oscillation providing mechanism, on the basis of sound information. The oscillation providing mechanism includes an actuator, a support member, and a biasing member. The actuator generates oscillation along a specified oscillation axis, and includes a rear end that is situated opposite to the oscillation-provision-target member in an axial direction of the oscillation axis.

Abstract: Alumina-zirconia lapping abrasives containing tetragonal zirconia at a rate of 30% or less and optionally containing at least one oxide selected from the group consisting of yttrium oxide, calcium oxide, magnesium oxide, titanium oxide and other rare earth oxide in the form of solid solution, which are produced by fusing alumina-zirconia abrasive materials, quenching fused materials to obtain an ingot, crushing the ingot and subjecting the crushed ingot to a heat treatment at a higher temperature than the phase transition temperature of zirconia.