Micromachined piezoelectric microspeaker and fabricating...

Details Micromachined piezoelectric microspeaker and fabricating... Micromachined piezoelectric microspeaker and fabricating...

2006-02-21

2006-02-21

Ni, Suhan (Department: 2646)

Electrical audio signal processing systems and devices

Electro-acoustic audio transducer

Electrostrictive, magnetostrictive, or piezoelectric

C381S173000

Reexamination Certificate

active

07003125

ABSTRACT:
A micromachined piezoelectric microspeaker and its fabricating method are disclosed. The micromachined piezoelectric microspeaker comprises a diaphragm and a plurality of contact pads. The diaphragm comprises an active area which is flat, and a non-active area which is wrinkled and surrounds the active area. The plurality of contact pads for electrodes are located outside of the diaphragm and over a wafer. And, the method comprises the steps of forming a compressive film on a wafer, forming a bottom electrode on a predetermined part of the compressive film of the front side of the wafer, forming a piezoelectric film on the bottom electrode and on the compressive film of the front side of the wafer, forming a bottom insulator film on the piezoelectric film, forming a top electrode on a predetermined part of the bottom insulator where the top electrode is located over some part of the bottom electrode, forming a top insulator film on the top electrode and on the bottom insulator film, forming contact pads for the bottom electrode and top electrode at an outside part of each electrode, and removing a predetermined part of the wafer which is located between wafer parts located under the each contact pads.

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