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:
May. 05, 2026
Filed:
Feb. 08, 2024
Canon Kabushiki Kaisha, Tokyo, JP;
Masataka Kato, Kanagawa, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
A liquid discharge head includes first, second and third substrates. The second substrate includes a piezoelectric element configured to generate energy for discharging liquid, and a protective layer. The protective layer includes a first protective layer in contact with the piezoelectric element and a second protective layer covering the first protective layer, wherein L>L>Lis satisfied, where Lis a length of a through hole, Lis a length of a communication port connecting the through hole and a liquid chamber in the second substrate, and Lis a length of an opening of the protective layer, on a straight line passing through a center of the through hole when viewed from a direction perpendicular to a surface of the element substrate, and wherein an inner wall surface of the opening of the protective layer is a substantially flat surface.