Electrical audio signal processing systems and devices – Electro-acoustic audio transducer – Electrostrictive – magnetostrictive – or piezoelectric
Patent
1998-06-24
2000-07-11
Le, Huyen
Electrical audio signal processing systems and devices
Electro-acoustic audio transducer
Electrostrictive, magnetostrictive, or piezoelectric
381398, 310324, H04R 2500
Patent
active
060884649
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a piezoelectric oscillator used as a sound source for an acoustic apparatus such as a speaker, and a speaker using the acoustic piezoelectric oscillator.
BACKGROUND ART
Various acoustic apparatuses such as speakers or others have been known in the prior art, wherein a piezoelectric oscillation plate, for example, a bimorph cell, is used as a sound source. Although the piezoelectric oscillation plate is excellent particularly in treble characteristics, resonance is liable to occur in the piezoelectric oscillation plate at a certain frequency to cause a peak, whereby the prior art fails to have a flat characteristic over a wide range of frequencies.
Also, there is a problem in that the movement of the piezoelectric oscillation plate is small, whereby it is difficult to sufficiently increase a sound pressure in a bass range by using the piezoelectric oscillation plate.
DISCLOSURE OF THE INVENTION
An object of the present invention is to solve the problems in the prior art.
To achieve the above object, according to the present invention, a piezoelectric oscillator wherein an oscillation controlling piece of elastomer is attached to the periphery of a piezoelectric oscillation plate is provided, and the piezoelectric oscillator is characterized in that the oscillation controlling piece is shaped so that the distance between an axis passing through a center of the piezoelectric oscillation plate, which is perpendicular to a straight line connecting a center of the piezoelectric oscillation plate to the center of gravity of the oscillation controlling piece, and a mass center line of the oscillation controlling piece varies along the axis.
According to another aspect of the present invention, a piezoelectric oscillator wherein an oscillation controlling pieces of elastomer is attached to the periphery of a piezoelectric oscillation plate is provided, and the piezoelectric oscillator is characterized in that the oscillation controlling piece is shaped so that a mass of each section of the oscillation controlling piece divided by a plurality of straight lines parallel to a straight line connecting a center of the piezoelectric oscillation plate to the center of gravity of the oscillation controlling piece varies along an axis which is perpendicular to the straight line and passes through the center of the piezoelectric oscillation plate.
The piezoelectric oscillator may be covered with a piezoelectric element layer generally all over each of the opposite surfaces of a metallic disk.
The piezoelectric oscillator may be covered with a piezoelectric element layer generally all over each of the opposite surfaces of a metallic disk.
According to a further aspect of the present invention, a speaker is provided wherein a dynamic speaker for a bass sound and an acoustic oscillation plate for generating medium and treble sounds are accommodated in a speaker box, and the acoustic oscillation plate is made to vibrate by a piezoelectric oscillation plate. In this speaker, the bass sound is allotted to the dynamic speaker and the medium and treble sound to the acoustic oscillation plate driven by the piezoelectric oscillation plate.
Preferably, the acoustic oscillation plate is a thin-walled flat plate held by the speaker box via an elastic member, and carries the piezoelectric oscillation plates on a back surface thereof with a space between each plate.
In addition, the piezoelectric oscillators may be arranged on the back surface of the acoustic oscillation plate and overlapped with each other.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a plan view of a piezoelectric oscillator according to a first embodiment of the present invention;
FIG. 2 is a sectional view of the piezoelectric oscillator attached to an acoustic oscillation plate of a speaker, taken along a line II--II in FIG. 1;
FIG. 3 is a plan view of a piezoelectric oscillator according to a second embodiment of the present invention;
FIG. 4 is a plan view of a piezoelectric oscillator according to a third em
Le Huyen
Shinsei Corporation
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