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:
Aug. 16, 2016
Filed:
Mar. 20, 2015
Brother Kogyo Kabushiki Kaisha, Nagoya-shi, Aichi-ken, JP;
Atsushi Hirota, Nagoya, JP;
Brother Kogyo Kabushiki Kaisha, Aichi-ken, JP;
Abstract
There is provided a piezoelectric actuator configured to displace to project toward a pressure chamber to apply pressure to a liquid inside the pressure chamber, the piezoelectric actuator including: a vibration plate having a compressive stress; a piezoelectric layer having a pulling stress; and an individual electrode. The compressive stress of the vibration plate has a magnitude which is not less than a threshold value at which an extreme point is generated in a relationship between a compliance of the piezoelectric actuator and a displacement volume of the pressure chamber in a case that an electric voltage is applied to the piezoelectric actuator, the displacement volume converting from increasing to decreasing relative to increase in the compliance at the extreme point; and the thickness of the piezoelectric actuator is not less than a first thickness corresponding to a compliance allowing the extreme point to generate.