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:
Sep. 30, 2025
Filed:
Dec. 13, 2022
Canon Kabushiki Kaisha, Tokyo, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
A liquid ejection head includes a pressure chamber communicating with an ejection port, an ejection element which ejects the liquid from the port, and a circulation path for the liquid including the chamber. The path includes a supply channel for supplying the liquid to the chamber, a collection channel for collecting the liquid from the chamber, a circulation pump which supplies the collected liquid to the supply channel, and a pressure adjustment unit configured to adjust a pressure on the liquid to be supplied to the supply channel. A pressure P21 on the liquid supplied to the chamber while the pump is stopped, a pressure P22 on the liquid supplied to the chamber while the pump is driven, and a pressure loss ΔP from the adjustment unit to the chamber while the pump is driven satisfy P22>P21 and P22−ΔP<0.