Piezoelectric element, piezoelectric member, liquid discharge head, and recording device each using piezoelectric element
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United States of America Patent
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Jan 23, 2018
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Nov 28, 2014
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Nov 28, 2013
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Abstract
The present invention aims at providing a piezoelectric element with less characteristic variations with time, and a liquid discharge head and a recording device each using the piezoelectric element. The piezoelectric element 30 of the present invention is the piezoelectric body 30 (piezoelectric ceramic layer 21b) containing a potassium sodium niobate composition as a primary component. The piezoelectric body extends in a planar direction. A compressive stress is applied in the planar direction. A phase transition point between a tetragonal crystal system and an orthorhombic crystal system is −20° C. or below.
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