ALEXANDRIA, Va., Aug. 5 -- United States Patent no. 12,697,810, issued on Aug. 4, was assigned to RISO Technologies Corp. (Tokyo).
"Drive device" was invented by Masaya Ichikawa (Tagata Shizuoka, Japan).
According to the abstract* released by the U.S. Patent & Trademark Office: "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 include...