| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a piezoelectric device and method of actuating the same in which a great distortion displacement quantity can be stably obtained and it is also possible to deal with thinning, and to provide a piezoelectric apparatus comprising the piezoelectric device and a control means for controlling actuation thereof. <P>SOLUTION: A piezoelectric device 1 comprises a piezoelectric body 13 and electrodes 12, 14 for applying an electric field in a predetermined direction across the piezoelectric body 13. The piezoelectric body 13 contains an inorganic compound polycrystal which contains firs ferroelectric substance crystals having orientational characteristics at the time free from electric field application, and has characteristics such that, with application of at least a predetermined electric field E1, at least part of the first crystals undergoes phase transition to second ferroelectric substance crystals of a crystal system different from the crystal system of the first crystals. The piezoelectric device 1 is actuated under conditions that a minimum applied electric field Emin and a maximum applied electric field Emax satisfy the following relation of Emin<E1<Emax (1). E1 is a minimum electric field strength starting phase transition from the first ferroelectric crystals to the second ferroelectric crystals. <P>COPYRIGHT: (C)2007,JPO&INPIT |
