Murata Manufacturing Co., Ltd.

Nobuhiko Nakagawa

Tadashi Takaya

Sasuga Kakehi

Hideo Adachi

Tsutomu Yoshii

A piezoelectric loudspeaker using a thin plate of piezoelectric ceramics of a high dielectric constant, and fixing a piezoelectric transducer including a thin plate of piezoelectric ceramic of a high dielectric constant onto a diaphragm stretched on a frame, thereby forming a sound generator. The piezoelectric loudspeaker is so constructed that the resonance frequency of the sound generator is set at the low frequency band side of an audio frequency region and that of a cavity by the frame is set at the high frequency band side, the thin plate piezoelectric ceramic of high dielectric constant being used, so that the piezoelectric loudspeaker is of an ultrathin type and can cover the whole audio frequency region.

Piezoelectric loudspeaker

A piezoelectric loudspeaker having a bending mode piezoelectric diaphragm mounted on a diaphragm stretched across a frame, the piezoelectric diaphragm being supported at its central portion to a support provided at the frame, so that the central portion of piezoelectric diaphragm is stationary free from vibrations, thereby being higher in a sound pressure level and smaller in acoustic distortion than the conventional loudspeaker.

Growing community of inventors

Ishikawa, Japan

Nobuhiko Nakagawa