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:
Mar. 03, 2026
Filed:
Mar. 07, 2024
Seiko Epson Corporation, Tokyo, JP;
Seiko Epson Corporation, Tokyo, JP;
Abstract
There is provided a liquid discharge head including: a piezoelectric element; a pressure chamber substrate provided with a pressure chamber that communicates with a nozzle; and a vibration plate configured to apply a pressure to a liquid in the pressure chamber by vibrating when the piezoelectric element is driven, in which the pressure chamber substrate, the vibration plate, and the piezoelectric element are laminated in this order in a lamination direction, the vibration plate includes an elastic film provided on the pressure chamber substrate and an insulating film provided between the elastic film and the piezoelectric element, and X>−0.48Z−904, where a compressive stress is represented by a negative value, a tensile stress is represented by a positive value, a film stress of the elastic film is X [MPa], and a film stress of the insulating film is Z [MPa].
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile