Piezoelectric print head and piezoelectric ink jet printer

Patent metadata

Field	Value
Publication number	US-2019202201-A1
Application number	US-201816229606-A
Country	US
Kind code	A1
Filing date	Dec 21, 2018
Priority date	Dec 28, 2017
Publication date	Jul 4, 2019
Grant date	—

Abstract

A piezoelectric print head includes a first discharge section, a second discharge section, a third discharge section, a first switch, a second, and a third switch. The second discharge section is located between the first discharge section and the third discharge section, the first switch and the third switch are switched in accordance with a print signal in synchronization with a first clock, the second switch is switched in accordance with a print signal in synchronization with a second clock, in a first period, the print signal synchronized with the second clock is transferred and the print signal synchronized with the first clock is not transferred, and in a second period, the print signal synchronized with the second clock is not transferred and the print signal synchronized with the first clock is transferred.

First claim

What is claimed is:

1 . A piezoelectric print head comprising:
a first discharge section group having a plurality of first discharge sections configured to discharge liquid; a second discharge section group having a plurality of second discharge sections configured to discharge the liquid; a third discharge section group having a plurality of third discharge sections configured to discharge the liquid; a first switch group having a plurality of first switches each configured to supply or not to supply a drive signal to the first discharge section to discharge the liquid; a first switch group having a plurality of second switches each configured to supply or not to supply the drive signal to the second discharge section to discharge the liquid; and a first switch group having a plurality of the first switches each configured to supply or not to supply the drive signal to the second discharge section to discharge the liquid, wherein the second discharge section group is located between the first discharge section group and the third discharge section group, the first switches and the third switches are switched in accordance with a print signal in synchronization with a first clock, the second switches are switched in accordance with a print signal in synchronization with a second clock, in a first period, the print signal synchronized with the second clock is transferred and the print signal synchronized with the first clock is not transferred, and in a second period, the print signal synchronized with the second clock is not transferred and the print signal synchronized with the first clock is transferred.

2 . The piezoelectric print head according to claim 1 , further comprising:
a clock distribution circuit configured to distribute an original clock signal as the first clock or the second clock.

3 . The piezoelectric print head according to claim 1 , wherein physical properties of the liquid change at less than 100° C.

4 . The piezoelectric print head according to claim 1 , wherein in the plurality of discharge section groups including the first discharge section group, the second discharge section group, and the third discharge section group, 400 or more discharge sections are arrayed in rows at a density of 300 or more per inch, and
switches that correspond to the respective 400 or more discharge sections are provided.

5 . The piezoelectric print head according to claim 1 , further comprising:
a fourth discharge section group having a plurality of fourth discharge sections configured to discharge the liquid; and a fourth switch group having a plurality of fourth switches each configured to supply or not to supply the drive signal to the fourth discharge section to discharge the liquid, wherein the fourth discharge section group is located between the first discharge section group and the third discharge section group, the fourth switch is switched in accordance with a print signal in synchronization with a third clock, and in a third period, the print signals synchronized with the first clock and the second clock are not transferred and the print signal synchronized with the third clock is transferred.

6 . A piezoelectric printer comprising:
a first discharge section group having a plurality of first discharge sections configured to discharge liquid onto a medium; a second discharge section group having a plurality of second discharge sections configured to discharge the liquid onto the medium; a third discharge section group having a plurality of third discharge sections configured to discharge the liquid onto the medium; a first switch group having a plurality of first switches each configured to supply or not to supply a drive signal to the first discharge section to discharge the liquid; a first switch group having a plurality of second switches each configured to supply or not to supply the drive signal to the second discharge section to discharge the liquid; a first switch group having a plurality of the first switches each configured to supply or not to supply the drive signal to the second discharge section to discharge the liquid; and
a transport section configured to transport the medium,
wherein the second discharge section group is located between the first discharge section group and the third discharge section group,
the first switches and the third switches are switched in accordance with a print signal in synchronization with a first clock,
the second switches are switched in accordance with a print signal in synchronization with a second clock,
in a first period, the print signal synchronized with the second clock is transferred and the print signal synchronized with the first clock is not transferred, and
in a second period, the print signal synchronized with the second clock is not transferred and the print signal synchronized with the first clock is transferred.

7 . The piezoelectric printer according to claim 6 , further comprising:
a clock distribution circuit configured to distribute an original clock signal as the first clock or the second clock.

8 . The piezoelectric printer according to claim 6 , wherein physical properties of the liquid change at less than 100° C.

9 . The piezoelectric printer according to claim 6 , wherein in the plurality of discharge section groups including the first discharge section group, the second discharge section group, and the third discharge section group, 400 or more discharge sections are arrayed in rows at a density of 300 or more per inch, and
switches that correspond to the respective 400 or more discharge sections are provided.

10 . The piezoelectric printer according to claim 6 , further comprising:
a fourth discharge section group having a plurality of fourth discharge sections configured to discharge the liquid; and a fourth switch group having a plurality of fourth switches each configured to supply or not to supply the drive signal to the fourth discharge section to discharge the liquid, wherein the fourth discharge section group is located between the first discharge section group and the third discharge section group, the fourth switch is switched in accordance with a print signal in synchronization with a third clock, and in a third period, the print signals synchronized with the first clock and the second clock are not transferred and the print signal synchronized with the third clock is transferred.

Assignees

• Seiko Epson Corp

Inventors

• Chikamoto Motonori

Classifications

• B41J2/11

  for ink spray · CPC title

• B41J2/14201

  Structure of print heads with piezoelectric elements · CPC title

• B41J2/04541

  Specific driving circuit · CPC title

• B41J2/04581 Primary

  controlling heads based on piezoelectric elements · CPC title

• B41J2/04515 Primary

  preventing overheating · CPC title