초록 ▼

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 peripherie

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.

대표청구항 ▼

[ I claim:] [1.] A sound generating device comprising:an acoustic vibration plate;a driving device having a plurality of piezoelectric vibration plates, the central portion of at least one of the piezoelectric vibration plates being connected to said acoustic vibration plate for driving said acousti

[ I claim:] [1.] A sound generating device comprising:an acoustic vibration plate;a driving device having a plurality of piezoelectric vibration plates, the central portion of at least one of the piezoelectric vibration plates being connected to said acoustic vibration plate for driving said acoustic vibration plate, wherein said piezoelectric vibration plates are arranged spaced from each other in an axial direction, wherein one of the peripheral and central portions of adjacent piezoelectric vibration plates are connected to each other, adjacent piezoelectric vibration plates being made to flex in opposite directions from each other, the piezoelectric vibration plate positioned at one end of said plurality of piezoelectric vibration plates being connected to an acoustic vibration plate; andan elastic plate member attached to the peripheral portion of said piezoelectric vibration plate and radially extending outward from the periphery of the piezoelectric vibration plate, said elastic plate member being attached to the peripheral portion of said piezoelectric vibration plate positioned at the other end of said plurality of piezoelectric vibration plates.