Piezoelectric element, liquid ejecting head, and liquid ejecting apparatus
AssigneeSeiko Epson Corporation
InventorsYasuaki Hamada, Shunsuke Yoshida, Yasuhiro Itayama, Toshihiro Shimizu, Masao Nakayama
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Abstract
An electric current based on electric charge produced on the piezoelectric body changes by going through a first path, a second path, a third path, and a fourth path in this order. On the first path, the electric current becomes larger as the voltage becomes higher. On the second path, the electric current becomes smaller as the voltage becomes higher. On the third path, the electric current becomes larger as the voltage becomes higher. On the fourth path, the electric current becomes smaller as the voltage becomes higher.
Claims31
A piezoelectric element, comprising:
- a first electrode;
- a second electrode;
- and
- a piezoelectric body disposed between the first electrode and the second electrode;
- wherein
- let a positive saturation voltage be defined as a positive voltage applied between the first electrode and the second electrode when electric charge produced on the piezoelectric body becomes saturated,
- let a negative saturation voltage be defined as a negative voltage applied between the first electrode and the second electrode when electric charge produced on the piezoelectric body becomes saturated,
- given the definition, when a voltage applied between the first electrode and the second electrode is changed progressively from the negative saturation voltage to the positive saturation voltage, an electric current based on electric charge produced on the piezoelectric body changes by going through a first path, a second path, a third path, and a fourth path in this order,
- on the first path, the electric current becomes larger as the voltage becomes higher,
- on the second path, the electric current becomes smaller as the voltage becomes higher,
- on the third path, the electric current becomes larger as the voltage becomes higher, and
- on the fourth path, the electric current becomes smaller as the voltage becomes higher.
A piezoelectric element, comprising:
- a first electrode;
- a second electrode;
- and
- a piezoelectric body disposed between the first electrode and the second electrode;
- wherein
- let a positive saturation voltage be defined as a positive voltage applied between the first electrode and the second electrode when electric charge produced on the piezoelectric body becomes saturated,
- let a negative saturation voltage be defined as a negative voltage applied between the first electrode and the second electrode when electric charge produced on the piezoelectric body becomes saturated,
- given the definition, when a voltage applied between the first electrode and the second electrode is changed progressively from the positive saturation voltage to the negative saturation voltage, an electric current based on electric charge produced on the piezoelectric body changes by going through a fifth path, a sixth path, a seventh path, and an eighth path in this order,
- on the fifth path, the electric current becomes smaller as the voltage becomes lower,
- on the sixth path, the electric current becomes larger as the voltage becomes lower,
- on the seventh path, the electric current becomes smaller as the voltage becomes lower, and
- on the eighth path, the electric current becomes larger as the voltage becomes lower.
Dependencies are inferred from the claim text.