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:
Jul. 14, 2026
Filed:
Jan. 15, 2024
Riso Technologies Corporation, Tokyo, JP;
Yasuhito Kiji, Mishima Shizuoka, JP;
RISO Technologies Corporation, Tokyo, JP;
Abstract
In an embodiment, a liquid ejection head includes a nozzle plate, a pressure chamber, an actuator, and a drive circuit. The actuator varies a volume of the pressure chamber in response to a driving signal from the drive circuit. The driving signal includes an ejection waveform for ejecting liquid from a nozzle and a cancellation waveform for suppressing residual oscillation after ejection of the liquid. The ejection waveform includes voltage changes in stages and the cancellation waveform also includes voltage changes in stages for suppressing residual oscillations and higher harmonic acoustic resonance frequencies.