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:
Sep. 01, 2026
Filed:
Nov. 15, 2024
Seiko Epson Corporation, Tokyo, JP;
Toru Kashimura, Shiojiri, JP;
Yoichiro Kondo, Chino, JP;
SEIKO EPSON CORPORATION, , JP;
Abstract
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 outputs an inspection signal, a processor for determining a state of the first nozzle based on the inspection signal, and a first switching circuit for switching whether to output the first residual vibration signal and the second residual vibration signal to the inspection signal output circuit, wherein the first piezoelectric element and the second piezoelectric element are electrically coupled at a first node, and the first switching circuit switches a conduction state between the first node and the inspection signal output circuit.