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:
Feb. 01, 2011
Filed:
Nov. 10, 2009
Kunio Tabata, Shiojiri, JP;
Atsushi Oshima, Shiojiri, JP;
Noritaka Ide, Shiojiri, JP;
Shinichi Miyazaki, Suwa, JP;
Hiroyuki Yoshino, Matsumoto, JP;
Nobuaki Azami, Matsumoto, JP;
Kunio Tabata, Shiojiri, JP;
Atsushi Oshima, Shiojiri, JP;
Noritaka Ide, Shiojiri, JP;
Shinichi Miyazaki, Suwa, JP;
Hiroyuki Yoshino, Matsumoto, JP;
Nobuaki Azami, Matsumoto, JP;
Seiko Epson Corporation, Tokyo, JP;
Abstract
A power amplifier includes: a modulator pulse-modulating a drive waveform signal serving as a reference of a drive signal applied to actuators and outputting a modulated signal; a digital power amplifier amplifying the power of the modulated signal and outputting an amplified digital signal; a low pass filter smoothing the amplified digital signal and outputting the drive signal; and an inverse filter circuit being disposed at a front stage of the modulator and capable of obtaining a desired waveform precision of the drive signal even when a frequency characteristic of a filter including the low pass filter and an electrostatic capacitor of the actuators varies depending on the number of driven actuators, wherein the inverse filter circuits include a plurality of inverse filters connected in series.