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:
Apr. 30, 2013
Filed:
Dec. 21, 2011
Kunio Tabata, Shiojiri, JP;
Toshiyuki Suzuki, Shiojiri, JP;
Osamu Shinkawa, Chino, JP;
Tomoki Hatano, Higashiomi, JP;
Atsushi Oshima, Shiojiri, JP;
Kunio Tabata, Shiojiri, JP;
Toshiyuki Suzuki, Shiojiri, JP;
Osamu Shinkawa, Chino, JP;
Tomoki Hatano, Higashiomi, JP;
Atsushi Oshima, Shiojiri, JP;
Seiko Epson Corporation, Tokyo, JP;
Abstract
A head drive of an inkjet printer includes nozzles and corresponding actuators that eject liquid ink drops. A drive unit applies a drive signal to the actuators. The drive unit includes a drive waveform generator that generates a drive waveform signal to control the drive of the actuators. A modulator pulse modulates the drive waveform. A digital power amplifier amplifies power of the modulated signal. A low pass filter smoothes the amplified digital signal and supplies the signal as a drive signal to the actuators. An inverse filter provided in a subsequent stage of the drive waveform generator corrects at least the frequency characteristics of the filter to predetermined frequency characteristics, independent of the number of the actuators to drive.