ALEXANDRIA, Va., Feb. 24 -- United States Patent no. 12,558,888, issued on Feb. 24, was assigned to Seiko Epson Corp. (Tokyo).
"Liquid ejection apparatus and driving method" was invented by Takahiro Katakura (Okaya, Japan) and Toshiro Murayama (Fujimi-machi, Japan).
According to the abstract* released by the U.S. Patent & Trademark Office: "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 gen...