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:
Jan. 17, 2007
Kunio Tabata, Shiojiri, JP;
Atsushi Oshima, Shiojiri, JP;
Osamu Shinkawa, Chino, JP;
Toshiyuki Suzuki, Shiojiri, JP;
Tomoki Hatano, Higashiomi, JP;
Kunio Tabata, Shiojiri, JP;
Atsushi Oshima, Shiojiri, JP;
Osamu Shinkawa, Chino, JP;
Toshiyuki Suzuki, Shiojiri, JP;
Tomoki Hatano, Higashiomi, JP;
Seiko Epson Corporation, Tokyo, JP;
Abstract
A head drive apparatus of an inkjet printer includes nozzles and corresponding actuators that eject liquid 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 as a reference of a signal to control drive of the actuators. A modulator pulse modulates a drive waveform signal generated by the drive waveform generator. A digital power amplifier amplifies power of a modulated signal subjected to the pulse modulation. A low pass filter smoothes an amplified digital signal subjected to the power amplification by the digital power amplifier and supplying 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, independently of the number of the actuators to drive.