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:
Jan. 13, 2026
Filed:
Nov. 14, 2023
Riso Technologies Corporation, Tokyo, JP;
Jun Takamura, Mishima Shizuoka, JP;
Takanori Gomi, Numazu Shizuoka, JP;
RISO Technologies Corporation, Tokyo, JP;
Abstract
A liquid ejection head includes a nozzle plate including a nozzle that ejects a liquid, a pressure chamber communicating with the nozzle, an actuator changing a volume of the chamber according to a signal, and a drive circuit issuing the signal that includes: one or more first ejection waveforms each including a first expansion pulse and a first contraction pulse at a first time after the first pulse, and a second ejection waveform including a second expansion pulse and a second contraction pulse at a second time after the second pulse, the second time being longer than the first time, and one or more of first to (n−1)-th drops are ejected by the first waveforms, and an n-th drop is ejected by the second waveform where n is a number of drops ejected for one pixel.