| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a piezoelectric sounding device in which a short-circuit failure is hard to occur. <P>SOLUTION: The piezoelectric sounding device has: a base which has a vibrating membrane and an external part of the vibrating membrane which is thicker than the vibrating membrane; a lower electrode layer which is formed on one side of the thickness direction on the surface of the base including the whole area on the surface of the vibrating membrane; a piezoelectric layer which has a thick part and a thin part whose thickness is thinner than that of the thick part, and formed of a piezoelectric material on the surface of the lower electrode layer; and an upper electrode layer which is formed on the surface of the thick part, wherein the vibrating membrane comprises: a first area which overlaps with at least a part of the thick part in the thickness direction; and a second area which is an area except the first area and overlaps with at least a part of the thin part in the thickness direction. <P>COPYRIGHT: (C)2011,JPO&INPIT |
