US Patent Issued to SEIKO EPSON on Sept. 1 for "Head unit and liquid ejection apparatus" (Japanese Inventors)

ALEXANDRIA, Va., Sept. 1 -- United States Patent no. 12,722,372, issued on Sept. 1, was assigned to SEIKO EPSON Corp. (Japan).

"Head unit and liquid ejection apparatus" was invented by Toru Kashimura (Shiojiri, Japan) and Yoichiro Kondo (Chino, Japan).

According to the abstract* released by the U.S. Patent & Trademark Office: "A head unit includes a first nozzle that communicates with a first pressure chamber and a second pressure chamber volumes of which change in accordance with a drive signal, and ejects a liquid, an inspection signal output circuit to which a first piezoelectric element for outputting a first residual vibration signal, and a second piezoelectric element for outputting a second residual vibration signal, and which outp...