Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Reexamination Certificate
2009-03-04
2011-12-27
San Martin, Jaydi (Department: 2837)
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
C252S06290R, C252S06290R
Reexamination Certificate
active
08084924
ABSTRACT:
An actuator includes a first electrode disposed on the top surface of a ceramic substrate (for example, zirconium oxide), a piezoelectric/electrostrictive substance disposed on the first electrode, and a second electrode disposed on the piezoelectric/electrostrictive substance, wherein the input of an electric power alters the volume of the piezoelectric/electrostrictive substance. The piezoelectric/electrostrictive substance contains a plurality of crystal grains that have a wavy structure composed of wavy grain boundaries including concave portions and convex portions. The crystal grains contain ABO3as the main component. The A site is Pb, and the B site contains such an amount of M that M becomes excessive after the piezoelectric/electrostrictive substance is formed (wherein M is at least one element selected from Mg, Ni, and Zn). The crystal grains of the piezoelectric/electrostrictive substance are oriented in the electric field direction, independently of the orientation of the substrate.
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Kobayashi Nobuyuki
Nanataki Tsutomu
Yura Yukinobu
Burr & Brown
Martin Jaydi San
NGK Insulators Ltd.
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