Liquid discharging apparatus

Patent metadata

Field	Value
Publication number	US-9481165-B2
Application number	US-201514671033-A
Country	US
Kind code	B2
Filing date	Mar 27, 2015
Priority date	Mar 22, 2013
Publication date	Nov 1, 2016
Grant date	Nov 1, 2016

Abstract

In a capacitive load drive circuit, first capacitive loads of a first capacitive load group are supplied a first driving signal and second capacitive loads of a second capacitive load group are supplied a second driving signal. A first driving signal generator generates the first driving signal from a control signal according to characteristics of the first capacitive load group, and a second driving signal generator generates the second driving signal from a control signal according to characteristics of the second capacitive load group. A control signal supply portion supplies a common control signal to the first driving signal generator and the second driving signal generator.

First claim

What is claimed is:

1. A capacitive load drive circuit comprising:
a first capacitive load group including a plurality of first capacitive loads that are supplied a first driving signal;
a second capacitive load group including a plurality of second capacitive loads that are supplied a second driving signal;
a first driving signal generator that generates the first driving signal from a first control signal according to characteristics of the first capacitive load group;
a second driving signal generator that generates the second driving signal from a second control signal according to characteristics of the second capacitive load group; and
a control signal supply portion that supplies a common control signal to the first driving signal generator and the second driving signal generator;
wherein the first driving signal generator corrects the common control signal to generate the first control signal, and the second driving signal generator corrects the common control signal to generate the second control signal.

2. The capacitive load drive circuit according to claim 1 , wherein waveforms of the first driving signal are different from waveforms of the second driving signal.

3. The capacitive load drive circuit according to claim 1 ,
wherein the first driving signal generator includes a first control signal correction portion that corrects the common control signal according to the characteristics of the first capacitive load group, and generates the first driving signal from the first control signal after correction of the common control signal by the first control signal correction portion, and
wherein the second driving signal generator includes a second control signal correction portion that corrects the common control signal according to the characteristics of the second capacitive load group, and generates the second driving signal from the second control signal after correction of the common control signal by the second control signal correction portion.

4. The capacitive load drive circuit according to claim 3 , wherein the first control signal correction portion and the second control signal correction portion each include:
a first holding portion that holds a first correction value;
a second holding portion that holds a second correction value; and
a correction processor that corrects the amplitude of the common control signal according to the first correction value and corrects a reference voltage of the common control signal according to the second correction value.

5. The capacitive load drive circuit according to claim 3 ,
wherein the first driving signal generator includes:
a first voltage generator that generates a plurality of voltages; and
a connection path selector that selects the plurality of voltages generated by the first voltage generator according to the first control signal after correction of the common control signal by the first control signal correction portion, and supplies the voltages as the first driving signal to a capacitive load, and
wherein the second driving signal generator includes:
a second voltage generator that generates a plurality of voltages; and
a connection path selector that selects the plurality of voltages generated by the second voltage generator according to the second control signal after correction of the common control signal by the second control signal correction portion, and supplies the voltages as the second driving signal to a capacitive load.

Assignees

• Seiko Epson Corp

Inventors

• Otsuka Shuji
• Kiyuna Tadashi
• Asanuma Toshifumi

Classifications

• B41J2/04506

  aiming at correcting manufacturing tolerances · CPC title

• B41J2/04588

  using a specific waveform · CPC title

• B41J2/04508

  aiming at correcting other parameters · CPC title

• B41J2/04581

  controlling heads based on piezoelectric elements · CPC title

• B41J2/04541 Primary

  Specific driving circuit · CPC title