发明名称 |
Capacitive load driving circuit and liquid ejection device |
摘要 |
A liquid ejection device, includes: a drive waveform signal output circuit which outputs a drive waveform signal to serve as a reference for the drive signal; a modulator which pulse-modulates the drive waveform signal and thus generates a first modulated signal and a second modulated signal having a different phase from the first modulated signal within a range from greater than 90 degrees to smaller than 270 degrees; a first digital power amplifier; a second digital power amplifier a first low pass filter which performs low pass filtering of the first amplified digital signal and thus generates a first demodulated signal; and a second low pass filter which performs low pass filtering of the second amplified digital signal and thus generates a second demodulated signal; wherein the first demodulated signal and the second demodulated signal are combined and applied as the drive signal to the capacitive load. |
申请公布号 |
US9073076(B2) |
申请公布日期 |
2015.07.07 |
申请号 |
US201414282847 |
申请日期 |
2014.05.20 |
申请人 |
SEIKO EPSON CORPORATION |
发明人 |
Oshima Atsushi;Tabata Kunio;Ide Noritaka;Yoshino Hiroyuki |
分类号 |
B41J29/38;B05B12/02;B41J2/045;B41J2/175;A61J3/07 |
主分类号 |
B41J29/38 |
代理机构 |
Maschoff Brennan |
代理人 |
Maschoff Brennan |
主权项 |
1. A control unit for use with an ejection unit and a liquid supplying unit, the control unit is configured to apply a predetermined drive signal to a capacitive load included in the ejection unit and the capacitive load is thus driven to eject a liquid when the control unit is connected with the ejection unit and the liquid supplying unit, the control unit comprising:
a drive waveform signal output circuit which outputs a drive waveform signal to serve as a reference for the drive signal; a modulator which pulse-modulates the drive waveform signal and thus generates a first modulated signal and a second modulated signal having a different phase from the first modulated signal within a range from greater than 90 degrees to smaller than 270 degrees; a first digital power amplifier which power-amplifies the first modulated signal and thus generates a first amplified digital signal; a second digital power amplifier which power-amplifies the second modulated signal and thus generates a second amplified digital signal; a first low pass filter which performs low pass filtering of the first amplified digital signal and thus generates a first demodulated signal; and a second low pass filter which performs low pass filtering of the second amplified digital signal and thus generates a second demodulated signal; wherein the first demodulated signal and the second demodulated signal are combined and applied as the drive signal to the capacitive load. |
地址 |
Tokyo JP |