Piezoelectric actuator and method for driving the same
AssigneeDenso Corporation
InventorsTakashi Yamamoto, Youta Iwamoto
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Abstract
This invention provides a piezoelectric actuator exhibiting a small change of displacement even when ranges of use conditions such as a temperature, an electric field and a compressive stress are broad, and a driving method of the piezoelectric actuator. In the piezoelectric actuator 1 using a piezoelectric body 11 undergoing displacement upon application of a voltage, a crystalline structure of the piezoelectric body 11 substantially exists on a tetragonal system side outside of a morphotropic phase boundary (MPB) between the tetragonal system and a rhombohedral system under conditions of the lowest temperature, the lowest electric field and the maximum compressive stress that are used.
Claims16
A piezoelectric actuator using a piezoelectric body undergoing displacement upon application of a voltage as a driving source, characterized in that a crystalline structure of said piezoelectric body substantially exists on a tetragonal system side outside of a morphotropic phase boundary (MPB) between said tetragonal system and a rhombohedral system under conditions of the lowest temperature, the lowest electric field and the maximum compressive stress that are used.
A method for driving a piezoelectric actuator using a piezoelectric body undergoing displacement upon application of a voltage as a driving source, characterized in that said piezoelectric body is constituted so that a crystalline structure thereof substantially exists on a tetragonal system side outside of a morphotropic phase boundary (MPB) between said tetragonal system and a rhombohedral system under conditions of the lowest temperature, the lowest electric field and the maximum compressive stress that are used, and that said piezoelectric body is driven under conditions of at least said lowest temperature, at least said lowest electric field and not greater than said maximum compressive stress.
Dependencies are inferred from the claim text.