Patent ID: 7068474

Claim:
A thin film piezoelectric element comprising: a pair of piezoelectric element units including a first piezoelectric element unit and a second piezoelectric element unit; wherein said first piezoelectric element unit includes a first structure, and said second piezoelectric element unit includes a second structure; wherein each of said first and second structures comprises a first piezoelectric thin film enclosed between a first principal electrode film and a first counter electrode film, and a second piezoelectric thin film enclosed between a second principal electrode film and a second counter electrode film, said first counter electrode film and said second counter electrode film being bonded together so as to face each other via an adhesive layer; wherein said first structure and said second structure are disposed on substantially a same plane; wherein said first and second structures are generally separate from each other but are coupled together at a bonding-region, said first and second counter electrode films of said first structure being coupled to said first and second counter electrode films of said second structure, respectively, at said bonding-region; wherein said first piezoelectric element unit includes a wiring connection part connecting said first principal electrode film of said first structure with said second principal electrode film of said first structure, and said second piezoelectric element unit includes a wiring connection part connecting said first principal electrode film of said second structure with said second principal electrode film of said second structure; wherein, at said bonding-region, said first counter electrode film of said first structure is integrally formed with said first counter electrode film of said second structure; and wherein, at said bonding region, said second counter electrode film of said first structure is integrally formed with said second counter electrode film of said second structure.