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. 10, 2025
Filed:
Mar. 23, 2023
Canon Kabushiki Kaisha, Tokyo, JP;
Masataka Kato, Kanagawa, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
A substrate for use in a liquid ejection head has an ejection hole for ejecting a liquid from the inside to the outside of the substrate. A plurality of scallops periodically changing the diameter of an inner circumferential surface of the ejection hole in the penetration direction are formed on the inner circumferential surface. The substrate for a liquid ejection head is characterized in that a width in the penetration direction of a first scallop present on the outermost side among the plurality of scallops is narrower than a width in the penetration direction of a second scallop adjacent to the first scallop on the inward side, and a depth in a radial direction of the ejection hole of the first scallop is shallower than a depth in the radial direction of the ejection hole of the second scallop.