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:
Aug. 11, 2015
Filed:
Mar. 30, 2011
Hiroyuki Yoshino, Matsumoto, JP;
Atsushi Oshima, Shiojiri, JP;
Kunio Tabata, Shiojiri, JP;
Shinichi Miyazaki, Suwa, JP;
Noritaka Ide, Shiojiri, JP;
Hiroyuki Yoshino, Matsumoto, JP;
Atsushi Oshima, Shiojiri, JP;
Kunio Tabata, Shiojiri, JP;
Shinichi Miyazaki, Suwa, JP;
Noritaka Ide, Shiojiri, JP;
Seiko Epson Corporation, Tokyo, JP;
Abstract
A capacitive load driving circuit includes: a drive waveform signal generator that generates a drive waveform signal; a subtractor that outputs a differential signal between the drive waveform signal and a feedback signal; a modulator that pulse-modulates the differential signal and outputs a modulated signal; a digital power amplifier that amplifies the power of the modulated signal and outputs a power-amplified modulated signal; a smoothing filter that smoothes the power-amplified modulated signal, and outputs a drive signal of the capacitive load; a compensator that causes a phase to precede the drive signal; and an attenuator that attenuates signal amplitude in a band at least including a modulation frequency of the modulated signal. A signal output from a connecting point between the inductor and the wire is made to pass through the compensator and the attenuator and is then used as a feedback signal to the subtractor.