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:
Nov. 08, 2011
Filed:
Apr. 23, 2008
Yuichi Nishihara, Matsumoto, JP;
Yuichi Nishihara, Matsumoto, JP;
Seiko Epson Corporation, Tokyo, JP;
Abstract
A liquid detection device that drives a liquid detecting portion includes a driving portion, a signal detecting portion, a high-pass filter portion, a first switch, and a control portion. The driving portion supplies a driving signal or a preliminary charging voltage to the liquid detecting portion. The signal detecting portion receives a detection signal from the liquid detecting portion. The high-pass filter portion has a capacitor portion and is arranged between the liquid detecting portion and the signal detecting portion. The first switch is arranged between the liquid detecting portion and the high-pass filter portion, and electrically connects or interrupts a line between the liquid detecting portion and the high-pass filter portion. The control portion controls the driving portion and the first switch to execute detection of liquid.