초록 ▼

A crystal sound producer has a piezoelectric crystal plate diaphragm which produces sound waves when applied with a voltage thereacross. A waveform transform plate has slits or linear grooves through which the sound waves from the diaphragm are radiated in semicylindrical waves. As these semicylindr

A crystal sound producer has a piezoelectric crystal plate diaphragm which produces sound waves when applied with a voltage thereacross. A waveform transform plate has slits or linear grooves through which the sound waves from the diaphragm are radiated in semicylindrical waves. As these semicylindrical waves propagate in the air, they superpose one another to form generally plane waves which sound natural to the human hearing. The crystal sound producer can be used in portable articles such as badges.

대표청구항 ▼

A crystal sound producer comprising: a diaphragm consisting of a piezoelectric crystal plate; means for applying an audio-frequency signal voltage across said diaphragm to cause said diaphragm to vibrate and emit sound waves; means for providing at least linear means through which the sound waves fr

A crystal sound producer comprising: a diaphragm consisting of a piezoelectric crystal plate; means for applying an audio-frequency signal voltage across said diaphragm to cause said diaphragm to vibrate and emit sound waves; means for providing at least linear means through which the sound waves from said diaphragm are radiated substantially in semicylindrical wave fronts; and a waveform transform film made of a hard synthetic resin secured to one face of said diaphragm, said film having parallel ridges raised on one face thereof away from said diaphragm, whereby the bottoms of the grooves defined between said ridges serve as said linear means.