Patent ID: 7583564
Filing Date: 2009-09-01
Classification: G04C,H02N

Abstract:
1. A piezoelectric actuator, comprising: a vibrator configured to vibrate by application of voltage, the vibrator having the piezoelectric elements and a reinforcing member that are stacked on each other, the reinforcing member having a free end that has the piezoelectric elements disposed thereon and that has a protuberance in contact with a driven object, and the reinforcing member having a fixed part that is fixedly attached to an attachment part to which the piezoelectric actuator is attached, the free end, when in a state in which no impact is applied to the attachment part from the outside, being disposed apart from to a first protrusion via prescribed first spaces that have specific dimensions, in order to limit displacement of the free end in the stacking direction of the piezoelectric elements and the reinforcing member, the fee end having an arm part on which a hole is formed, the attachment part having a second protrusion that extends towards the hole and that is inserted through the hole, the free end, when in a state in which no impact is applied from the outside, being disposed apart from the second protrusion via prescribed second spaces that have specific dimensions, in order to limit displacement of the free end in a planar direction being perpendicular to the stacking direction, the second spaces being formed between the second protrusion and the inner peripheral edge of the hole in the arm part.