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:
Mar. 31, 2020
Filed:
Feb. 26, 2019
Seiko Epson Corporation, Tokyo, JP;
Seiko Epson Corporation, Tokyo, JP;
Abstract
A printer as an example of a liquid discharging apparatus includes a nozzle, a drive signal generation unit that generates a drive signal for driving a piezoelectric element, and a discharge abnormality detection unit that detects a change of an electromotive force of the piezoelectric element, which is caused by residual vibration in a cavity after the drive signal is supplied. The drive signal generation unit generates a first drive signal for checking whether or not a first discharge abnormality caused by a foreign substance adhering to a surface on which the nozzle opens occurs and a second drive signal for checking whether or not a second discharge abnormality caused by a cause other than the foreign substance occurs. The potential change for detecting the first drive signal is greater than the potential change for detecting the second drive signal.