Sound generating device

Details Sound generating device Sound generating device

H - Electricity

04

R

H04R 17/00 (2006.01) H04R 1/40 (2006.01)

Patent

CA 2167318

A driving device (14) of an acoustic vibration plate (11) is arranged between a speaker frame (10) and the acoustic vibration plate (11). The driving device (14) is comprised of a pair of piezoelectric vibration plates (1, 2) arranged facing each other across a certain distance. The outer peripheries of the piezoelectric vibration plates (1, 2) are connected to each other by an annular spacer (7). When a drive signal is applied to the piezoelectric vibration plates (1, 2), the piezoelectric vibration plates (1, 2) repeatedly undergo flexing motion wherein their centers flex alternately in opposite directions. At this time, the flexing directions of the piezoelectric vibration plates (1, 2) are always reverse to each other.

Un dispositif de commande (14) de membrane acoustique (11) est situé entre le bâti d'un haut-parleur (10) et la membrane (11). Ce dispositif (14) est composé d'une paire de plaques vibrantes piézoélectriques (1 et 2) opposées l'une par rapport à l'autre avec un intervalle intermédiaire et dont les bords sont accouplés les uns aux autres. Quand on applique un signal de commande aux plaques (1 et 2), celles-ci subissent des mouvements d'incurvation, de telle manière que leurs parties centrales sont incurvées alternativement dans des sens opposés et, de ce fait, les sens d'incurvation desdites plaques (1 et 2) sont toujours opposés l'un par rapport à l'autre.

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