Patent ID: 7845767
Filing Date: 2010-12-07
Classification: B41J,H01L

Abstract:
1. A piezoelectric device, comprising: i) a piezoelectric body, which has piezoelectric characteristics, and ii) electrodes for applying an electric field in a predetermined direction across the piezoelectric body, the piezoelectric body consisting of an inorganic compound polycrystal, which contains first ferroelectric substance crystals having crystal orientational characteristics at the time free from electric field application, and which has characteristics such that, with electric field application of at least a predetermined electric field E the piezoelectric device being actuated under conditions such that a minimum applied electric field Emin and a maximum applied electric field Emax satisfy Formula (1): wherein the electric field E 1 represents the minimum electric field at which the phase transition from the first ferroelectric substance crystals to the second ferroelectric substance crystals begins.