Liquid discharge apparatus and control method of liquid discharge apparatus

Patent metadata

Field	Value
Publication number	US-2016114579-A1
Application number	US-201614990097-A
Country	US
Kind code	A1
Filing date	Jan 7, 2016
Priority date	May 2, 2014
Publication date	Apr 28, 2016
Grant date	—

Abstract

A liquid discharge apparatus includes a piezoelectric element in which a drive signal is applied and which is displaced to eject a liquid; a zeroth wire of a zeroth potential; a first wire of a first potential that is higher than the zeroth potential; a second wire of a second potential that is higher than the first potential; and a connection path selecting section that electrically connects one end of the piezoelectric element to the zeroth wire, the first wire, or the second wire in response to a voltage of a source drive signal that controls the voltage of the drive signal and a hold voltage of the piezoelectric element. Here, a first potential difference from the zeroth potential to the first potential is different from a second potential difference from the first potential to the second potential.

First claim

What is claimed is:

1 . A driving circuit for driving a capacitive load, comprising:
a zeroth wire of a zeroth potential; a first wire of a first potential that is higher than the zeroth potential; a second wire of a second potential that is higher than the first potential; and a connection path selecting section that electrically connects one end of the capacitive load to the zeroth wire, the first wire, or the second wire in response to a voltage of a source drive signal that controls the voltage of a drive signal for driving the capacitive load and a hold voltage of the capacitive load, wherein a first potential difference from the zeroth potential to the first potential is different from a second potential difference from the first potential to the second potential.

2 . The driving circuit according to claim 1 ,
wherein the second potential difference is higher than the first potential difference.

3 . The driving circuit according to claim 1 ,
wherein the second potential difference is greater than the first potential difference in a case where a time for which the potential of the drive signal is maintained in a first range from the zeroth potential or higher to lower than the first potential is longer than a time for which the potential of the drive signal is maintained in a second range from the first potential or higher to lower than the second potential, and wherein the second potential difference is lower than the first potential difference in a case where the time for which the potential of the drive signal is maintained in the first range is shorter than the time for which the potential of the drive signal is maintained in the second range.

4 . The driving circuit according to claim 1 , further comprising:
a p-th wire of a p-th potential; a (p+1)-th wire of a (p+1)-th potential which is higher than the p-th potential; a q-th wire of a q-th potential; and a (q+1)-th wire of a (q+1)-th potential which is higher than the q-th potential, wherein the connection path selecting section electrically connects one end of the capacitive load to the p-th wire, the (p+1)-th wire, the q-th wire, or the (q+1)-th wire in response to a voltage of a source drive signal that controls the voltage of the drive signal and a hold voltage of the capacitive load, and wherein, when a predetermined standby non-discharge potential is between the n-th potential or higher and lower than the (n+1)-th potential, the p-th potential difference from the p-th potential to the (p+1)-th potential is lower than the q-th potential difference from the q-th potential to the (q+1)-th potential.

5 . The driving circuit according to claim 1 ,
wherein, when a voltage waveform of the source drive signal is changed, at least one of the first potential difference or the second potential difference is changed.

6 . A control method of a driving circuit for driving a capacitive load which includes
a zeroth wire of a zeroth potential, a first wire of a first potential that is higher than the zeroth potential, and a second wire of a second potential that is higher than the first potential, and in which a first potential difference from the zeroth potential to the first potential is different from a second potential difference from the first potential to the second potential, the method comprising: electrically connecting one end of the capacitive load to the zeroth wire, the first wire, or the second wire in response to a voltage of a source drive signal that controls a drive signal for driving the capacitive load and a hold voltage of the capacitive load.

Assignees

• Seiko Epson Corp

Inventors

• Otsuka Shuji
• Kiyuna Tadashi
• Asanuma Toshifumi

Classifications

• B41J2/04573

  Timing; Delays · CPC title

• B41J2/0459

  Height of the driving signal being adjusted · CPC title

• B41J2/0455

  Details of switching sections of circuit, e.g. transistors · CPC title

• B41J2/04588

  using a specific waveform · CPC title

• B41J2/04598

  Pre-pulse · CPC title