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:
Feb. 24, 2026
Filed:
Aug. 28, 2023
Seiko Epson Corporation, Tokyo, JP;
Takahiro Katakura, Okaya, JP;
Toshiro Murayama, Fujimi-machi, JP;
Seiko Epson Corporation, Tokyo, JP;
Abstract
A liquid ejection apparatus includes an ejection unit including a nozzle, a pressure chamber, and a piezoelectric element that applies pressure fluctuations to a liquid in the pressure chamber according to a supplied drive signal, a drive signal generation unit that generates the drive signal, and a detection unit that detects a residual vibration generated in the pressure chamber. The drive signal generation unit generates the drive signal having a detection waveform including an expansion element that changes in potential from a first potential to a second potential to expand the pressure chamber, and an expansion potential maintaining element that maintains the second potential following the expansion element. A length of a period from a start to an end of a change in potential from the first potential to the second potential is equal to or greater than a length of a natural vibration cycle of the ejection unit.