Sound generating device
First 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; and
an 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.
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Accused Products
Abstract
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.
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Citations
38 Claims
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1. A sound generating device comprising:
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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; and an 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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 35)
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15. A sound generating device comprising:
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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 driving device is comprised of a pair of piezoelectric vibration plates connected to each other at central portions thereof, the peripheral portion of one of said piezoelectric vibration plates being connected to said acoustic vibration plate; and an 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 the other piezoelectric vibration plate.
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16. A sound generating device comprising:
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a frame; an acoustic vibration plate; a driving device having at least one piezoelectric vibration plate, wherein a peripheral portion of said at least one piezoelectric vibration plate is connected to said acoustic vibration plate for driving said acoustic vibration plate; and a flexible, elastic plate member attached to a central portion of said piezoelectric vibration plate via a connecting rod and radially extending outward from the connecting rod, wherein the elastic plate member is coupled to the frame only via the central portion of the piezoelectric-vibration plate so that a peripheral portion of the elastic plate member is freely movable with respect to the frame. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33)
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34. A sound generating device comprising:
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a frame; an acoustic vibration plate; a driving device having at least one piezoelectric vibration plate, the central portion of said piezoelectric vibration plate being connected to said acoustic vibration plate for driving said acoustic vibration plate; and an elastic, flexible plate member, a central portion of which is attached to the peripheral portion of said piezoelectric vibration plate, wherein the elastic plate member extends radially outward from the periphery of the piezoelectric vibration plate and wherein the elastic plate member is coupled to the frame only via the piezoelectric vibration plate so that a peripheral portion of the elastic plate member is freely movable with respect to the frame. - View Dependent Claims (36, 37, 38)
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Specification