公开(公告)号：US20170182773A1

公开(公告)日：2017-06-29

申请号：US15362015

申请日：2016-11-28

Applicant: SEIKO EPSON CORPORATION

Inventor： Kazuhito FUJISAWA ,  Ryota FURUKAWA

IPC: B41J2/14

CPC classification number: B41J2/14201 ,  B41J2/0451 ,  B41J2/04541 ,  B41J2/04581 ,  B41J2/04593 ,  B41J2/14233 ,  B41J2002/14354 ,  B41J2002/14491

Abstract: A head unit includes a discharge section, a determination circuit, and a discharge limitation circuit. The discharge section is equipped with a piezoelectric element that is configured to be displaced in accordance with changes in potential of a drive signal when the drive signal is supplied. The discharge section is configured to discharge a liquid in accordance with displacement of the piezoelectric element. The determination circuit is configured to determine whether or not the piezoelectric element has a predetermined power storage capability. The discharge limitation circuit is configured to stop supply of the drive signal to the piezoelectric element and limit discharging of liquid from the discharge section when a result of determination is negative.

公开(公告)号：US20190009531A1

公开(公告)日：2019-01-10

申请号：US16065908

申请日：2016-12-22

Applicant: Seiko Epson Corporation

Inventor： Ryota FURUKAWA

IPC: B41J2/045

Abstract: A head unit control circuit controls a head unit. The head unit includes: an ejector, a determination circuit, and an ejection limit circuit. The injector includes a displaceable piezoelectric element. The piezoelectric element is displaced by changing a drive signal potential. The determination circuit determines whether the piezoelectric element has a predetermined electrical storage capability. The ejection limit circuit stops the drive signal to limit the ejection of the liquid based on the determination. The head unit control circuit supplies an instruction signal, a first designation signal, and a second designation signal to the head unit. The instruction signal instructs the head unit to execute the determination. The determination circuit executes the determination during a period in which the first designation signal is set to a high level, the second designation signal is set to a low level, and the instruction signal is supplied.

公开(公告)号：US20170021615A1

公开(公告)日：2017-01-26

申请号：US15213513

申请日：2016-07-19

Applicant: Seiko Epson Corporation

Inventor： Kyohei DATE ,  Masashi KAMIYANAGI ,  Ryota FURUKAWA ,  Kazuhito FUJISAWA ,  Hiroshi SUGITA

IPC: B41J2/045

CPC classification number: B41J2/04588 ,  B41J2/04541 ,  B41J2/04581 ,  B41J2/04593 ,  B41J2/16579 ,  B41J2/17566 ,  B41J2/2142 ,  H03G3/3026

Abstract: A liquid discharge apparatus includes a controller, a drive signal generation unit, a discharge unit, a residual vibration detection unit, and an amplification unit, in which the controller generates discharge control data for controlling discharge of liquid and controls an amplification rate of an amplification unit, the drive signal generation unit generates and outputs a drive signal including a plurality of waveforms driving the discharge unit, the discharge unit discharges the liquid by applying a waveform assigned by the discharge control data among the plurality of waveforms included in the drive signal, the residual vibration detection unit detects residual vibration of the discharge unit and outputs a residual vibration signal indicating the residual vibration, after the discharge unit is driven by the drive signal, and the amplification unit amplifies the residual vibration signal with the amplification rate controlled by the controller and outputs the amplified signal.

Abstract translation: 液体排出装置包括控制器，驱动信号生成单元，放电单元，残余振动检测单元和放大单元，其中控制器产生用于控制液体放电的放电控制数据，并控制放大的放大率 驱动信号生成单元生成并输出包括驱动放电单元的多个波形的驱动信号，放电单元通过在驱动信号中包含的多个波形中施加由放电控制数据分配的波形来对液体进行放电， 剩余振动检测单元在放电单元被驱动信号驱动之后，检测放电单元的剩余振动并输出表示残留振动的残留振动信号，并且放大单元以由放大单元控制的放大率放大剩余振动信号 控制器并输出放大信号。

公开(公告)号：US20210300029A1

公开(公告)日：2021-09-30

申请号：US17210655

申请日：2021-03-24

Applicant: SEIKO EPSON CORPORATION

Inventor： Ryota FURUKAWA

IPC: B41J2/045

Abstract: A print head includes: an integrated circuit apparatus that switches whether or not to supply drive signals to a plurality of piezoelectric elements, and includes a first circuit block that switches whether or not to supply the drive signal, a second circuit block that switches whether or not to supply the drive signal, a third circuit block that switches whether or not to supply the drive signal, a fourth circuit block, and a first buffer area, a second buffer area, and a third buffer area in which no circuit element is located, in which the first buffer area is located between the first circuit block and the fourth circuit block, the second buffer area is located between the second circuit block and the fourth circuit block, and the third buffer area is located between the third circuit block and the fourth circuit block.

公开(公告)号：US20190092001A1

公开(公告)日：2019-03-28

申请号：US16141014

申请日：2018-09-25

Applicant: SEIKO EPSON CORPORATION

Inventor： Ryota FURUKAWA

IPC: B41J2/045

CPC classification number: B41J2/04551 ,  B41J2/04515 ,  B41J2/04536 ,  B41J2/04541 ,  B41J2/04581 ,  B41J2/04593 ,  B41J2/04596 ,  B41J2/14233 ,  B41J2002/14241 ,  B41J2002/14362 ,  B41J2002/14419

Abstract: A piezoelectric print head includes a piezoelectric element; a nozzle that ejects liquid when the piezoelectric element is driven; a transmission gate that switches between supply and non-supply of a driving signal for driving the piezoelectric element to the piezoelectric element; a history-information memory that holds history information indicating history of ON or OFF of the transmission gate; and a switch-operation stop controller that stops a switch operation that causes the transmission gate to be turned OFF from ON or to be turned ON from OFF, in accordance with the history information.