Patent ID: 7619349

Claim:
A piezoelectric driven MEMS device comprising: a substrate; a first actuator which comprises a first lower electrode, a first piezoelectric film formed on the first lower electrode, and a first upper electrode formed on the first piezoelectric film, and which has a first end fixed onto the substrate; a second actuator which is disposed on the substrate in parallel with the first actuator, and which comprises a second lower electrode, a second piezoelectric film formed on the second lower electrode, and a second upper electrode formed on the second piezoelectric film; a first connection portion which connects a second end of the first actuator to a first end of the second actuator opposed to the second end of the first actuator; a third actuator which is disposed on the opposite side of the second actuator from the first actuator and in parallel with the first actuator, which comprises a third lower electrode, a third piezoelectric film formed on the third lower electrode, and a third upper electrode formed on the third piezoelectric film, and which has a first end fixed onto the substrate; a fourth actuator which is disposed on the substrate between the second actuator and the third actuator and in parallel with the third actuator, which comprises a fourth lower electrode, a fourth piezoelectric film formed on the fourth lower electrode, and a fourth upper electrode formed on the fourth piezoelectric film; a second connection portion which connects a second end of the third actuator to a first end of the fourth actuator opposed to the second end of the third actuator; a third connection portion which connects a second end of the second actuator to a second end of the fourth actuator; and a fixed electrode formed on the substrate so as to be opposed to the second ends of the second actuator and the fourth actuator, the first actuator and the second actuator being disposed so as to be substantially symmetrical to the third actuator and the fourth actuator about a central line between the second actuator and the fourth actuator.