The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 23, 2026
Filed:
Mar. 29, 2023
Seiko Epson Corporation, Tokyo, JP;
Yasuaki Hamada, Chino, JP;
Yasuhiro Itayama, Kai, JP;
Koji Ohashi, Matsumoto, JP;
Kazuya Kitada, Matsumoto, JP;
Yoshiki Yano, Chino, JP;
Masao Nakayama, Shiojiri, JP;
Seiko Epson Corporation, Tokyo, JP;
Abstract
A droplet ejection head includes a nozzle plate having a nozzle, a pressure chamber forming substrate having a pressure chamber, a vibration plate, and a piezoelectric element containing potassium, sodium, and niobium and formed on the vibration plate. The piezoelectric element includes a first electrode, a second electrode, and a piezoelectric layer located between the first electrode and the second electrode. A total thickness of the piezoelectric layer, the first electrode, and the second electrode is larger than a thickness of the vibration plate. An absolute value of a displacement amount of the vibration plate when a voltage having an absolute value of 25 V is applied to the piezoelectric element as a voltage for displacing the vibration plate in a direction in which a volume of the pressure chamber expands is twice or more an absolute value of a displacement amount of the vibration plate when a voltage having an absolute value of 25 V is applied to the piezoelectric element as a voltage for displacing the vibration plate in a direction in which a volume of the pressure chamber contracts.