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. 08, 2009
Filed:
Sep. 28, 2005
Toshiki Usui, Nagano-ken, JP;
Toshiki Usui, Nagano-ken, JP;
Seiko Epson Corporation, Tokyo, JP;
Abstract
A printing method that can suppress drops in voltage due to discharging of piezo elements is achieved. A printing method includes: generating a drive signal for driving a piezo element by selecting, based on print data, either a first original drive signal having a unit signal for defining the start to the end of an operation of causing the piezo element to eject ink by changing a voltage of the piezo element using a first reference voltage as a reference, or a second original drive signal having a unit signal for defining the start to the end of an operation of causing the piezo element to eject ink by changing the voltage of the piezo element using a second reference voltage as a reference; ejecting ink using the piezo element by applying the generated drive signal thereto to charge/discharge the piezo element; and charging the piezo element so that the voltage thereof attains either the first or second reference voltage during a predetermined period during which neither the first nor the second original drive signal is selected.