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:
Aug. 04, 2026
Filed:
May. 31, 2024
Riso Technologies Corporation, Tokyo, JP;
Masaya Ichikawa, Tagata Shizuoka, JP;
RISO Technologies Corporation, Tokyo, JP;
Abstract
A drive device includes a drive circuit to output a drive signal that is to be applied to an actuator of a liquid ejection head for ejecting liquid droplets. The drive signal includes an adjustment ejection waveform portion that includes a first portion having an expansion pulse that decreases pressure in a pressure chamber of the actuator and a second portion having a contraction pulse that increases pressure in the pressure chamber. The contraction pulse includes voltage increase changes that change the voltage applied to the actuator stepwise and a return pulse that is between a pair of voltage increase changes. The return pulse changes from a first voltage level that is less than a maximum voltage level of the contraction pulse to a second voltage level that is greater than a minimum voltage level of the expansion pulse.