| 摘要 |
There are disclosed a piezoelectric actuator which can obtain large displacement at low voltage, which is small-sized and lightweight, and whose manufacture cost is low, and a small-sized lightweight information storage apparatus in which the piezoelectric actuator is incorporated, and which is provided with a small inertia moment during head driving and a high recording density. A piezoelectric actuator <bold>200 </highlight>includes a center body <bold>200</highlight><italic>a </highlight>and two spiral arms <bold>200</highlight><italic>b</highlight>, and two arms <bold>200</highlight><italic>b </highlight>are entirely in rotation symmetry and nonlinear symmetry.
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