Patent ID: 7312955

Claim:
A piezoelectric actuator comprising: a flexible substrate including a slit so as to form a first flexible substrate and a second flexible substrate, said first and second flexible substrates being positioned in and along a same plane and being separated by the slit; a first piezoelectric element unit disposed on said first flexible substrate; a second piezoelectric element unit disposed on said second flexible substrate approximately in parallel with said first piezoelectric element unit such that said first and second piezoelectric element units are separated from each other by the slit; and a coupling portion that extends across the slit and couples said first flexible substrate to said second flexible substrate to suppress a wavy resonance phenomenon of said first flexible substrate and said second flexible substrate, wherein said coupling portion is positioned to correspond to a location of an antinode of a primary bending mode of said first piezoelectric element unit and said second piezoelectric element unit, wherein each of said first and second piezoelectric element units includes a first end and a second end, wherein said first and second ends of said first piezoelectric element unit are fixed on said first flexible substrate, and wherein said first and second ends of said second piezoelectric element unit are fixed on said second flexible substrate.