Piezoelectric sounding body and electronic device using the...

Details Piezoelectric sounding body and electronic device using the... Piezoelectric sounding body and electronic device using the...

2006-03-28

2008-11-04

Tarcza, Thomas H. (Department: 3662)

Electrical audio signal processing systems and devices

Electro-acoustic audio transducer

Electrostrictive, magnetostrictive, or piezoelectric

C381S191000, C367S140000

Reexamination Certificate

active

07447324

ABSTRACT:
Electrode layers22A-22C,24A-24C are formed on both main surfaces of each of piezoelectric layers20A,20B. Voltages of different polarities are respectively applied to the electrode layers next to each other on the same main surface and to the electrode layers opposing to each other via the piezoelectric layer. Projection forms30, 32are formed in respective edges of the second electrode layers22B,24B, each of which extends into the opposite area. Through-holes are formed in the piezoelectric layer20A,20B, in positions off a division line38. The electrode layers22A-22C are connected together by the through-holes26A,26B and the projection form30, to have an equal potential. Those are lead from the diaphragm to the outside, thus reducing the overall thickness.

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