Sound generating apparatus, a sound detection apparatus, an acoustic sensor, and an acoustic living body measuring apparatus

Abstract

A sound generating apparatus or a sound detecting apparatus includes: a flexible substrate; and a plurality of bimorphs arranged on a surface of the flexible substrate in a direction at a predetermined interval, each of the bimorphs having input/output terminals. Each of the bimorphs has a rectangular shape and its longitudinal direction is perpendicular to the direction. The flexible substrate has a slit between successive two of the bimorphs. A width of the slit outside the bimorphs is wide. A buffering material covering surfaces of the flexible substrate with the bimorphs exposed or a cover covering the bimorphs with a space may be provided. The cover and the buffering material may have slit. A sound generating apparatus including a plurality of flexible substrates respectively supporting bimorphs may be provided. The flexible substrate may have a comb shape. An acoustic sensor includes the sound generating apparatus, the sound detection apparatus connected therebetween by a flexible substrate, wherein the flexible substrate may include a cable and a connector. A living body measuring apparatus includes the acoustic sensor, wherein phase shift between the sound signal induced by the bimorph and a reference drive signal is detected and a blood pressure is operated by the phase shift amount.