公开(公告)号：US20170305146A1

公开(公告)日：2017-10-26

申请号：US15643212

申请日：2017-07-06

Applicant: OCE-TECHNOLOGIES B.V.

Inventor： Marko MIHAILOVIC ,  Tjerk E.C. HUMMEL ,  Johannes M.M. SIMONS ,  Hylke VEENSTRA ,  Cornelis W.M. VENNER ,  Amol A. KHALATE

IPC: B41J2/045

CPC classification number: B41J2/0451 ,  B41J2/04581 ,  B41J2/04586 ,  B41J2/04596 ,  B41J2002/14354

Abstract: An inkjet print head includes an ejection unit having a liquid chamber for holding an amount of liquid, a electromechanical transducer operatively coupled to the liquid chamber for generating a pressure wave in the amount of liquid and a nozzle in fluid communication with the liquid chamber for enabling a droplet of the amount of liquid to be ejected through the nozzle. A method for detecting an operating state of the ejection unit includes the consecutive steps of actuating the electromechanical transducer to generate a pressure wave in the liquid; actuating the electromechanical transducer to suppress a residual pressure wave in the liquid; sensing an amplitude of the residual pressure wave in the liquid; and based on the result of the sensing step determining that the ejection unit is (i) in an operative state if the amplitude of the residual pressure wave is below a threshold or (ii) in a malfunctioning state if the amplitude of the residual pressure wave is above the threshold.

公开(公告)号：US20170225455A1

公开(公告)日：2017-08-10

申请号：US15493960

申请日：2017-04-21

Applicant: OCE-TECHNOLOGIES B.V.

Inventor： Hylke VEENSTRA ,  Marko MIHAILOVIC ,  Cornelis W.M. VENNER ,  Amol A. KHALATE ,  Tjerk E.C. HUMMEL

IPC: B41J2/045

CPC classification number: B41J2/0451 ,  B41J2/04581 ,  B41J2/16579 ,  B41J2/2142 ,  B41J2/325 ,  B41J2/355 ,  B41J2002/14354

Abstract: For assessing the functioning of an ejection unit of an inkjet print head, a comparison of a residual pressure wave with a residual pressure wave reference is employed. To enable assessment during printing, multiple residual pressure wave references are provided, each relating to a condition relevant to the residual pressure wave. Such a condition may relate to an actuation status of an adjacent ejection unit which may cause crosstalk, for example. When performing the assessment, the condition during assessment is taken into account, for example for selecting a suitable residual pressure wave reference, such that an appropriate and correct assessment can be performed independent from the conditions during assessment.

公开(公告)号：US20180178506A1

公开(公告)日：2018-06-28

申请号：US15903967

申请日：2018-02-23

Applicant: OCE-TECHNOLOGIES B.V.

Inventor： Amol A. KHALATE ,  Johannes M. M SIMONS ,  Marko MIHAILOVIC

IPC: B41J2/045 ,  B41J2/14

Abstract: A droplet ejection device has a nozzle head with a plurality of ejection units, each of which includes a nozzle, a duct connected to the nozzle, and an electromechanical transducer arranged to create a pressure wave in a liquid in the duct so as to expel a droplet of the liquid from the nozzle. The device further includes an electronic control circuit arranged to apply control signals to the transducers and to receive detection signals that are generated in the transducers in response to the transducer being exposed to pressure fluctuations. The nozzle head includes a reference duct which has an electromechanical transducer serving as a reference transducer. The control circuit is arranged to subtract a detection signal of the reference transducer from a detection signal of at least one of the ejection units.

公开(公告)号：US20160375683A1

公开(公告)日：2016-12-29

申请号：US15188699

申请日：2016-06-21

Applicant: OCE-TECHNOLOGIES B.V.

Inventor： Hylke VEENSTRA ,  Theo HUMMEL ,  Amol KHALATE ,  Cor VENNER ,  Marko MIHAILOVIC

IPC: B41J2/045 ,  B41J2/14

CPC classification number: B41J2/04551 ,  B41J2/04571 ,  B41J2/04573 ,  B41J2/04581 ,  B41J2/04588 ,  B41J2/04596 ,  B41J2/14008 ,  B41J2/14201 ,  B41J2002/14354 ,  B41J2002/1437

Abstract: A liquid jetting device comprising a plurality of ejection units each of which is arranged to eject a droplet of a liquid and comprises a nozzle, a liquid duct connected to the nozzle and an electro-mechanical transducer arranged to create an acoustic pressure wave in the liquid in the duct, the device further comprising an electronic control system arranged to receive a pressure signal from at least one of the transducers and to generate a transducer control signal on the basis of the received pressure signal and to control the transducers of said plurality of ejection units to operate in a mode of operation selected from a variety of different modes of operation, wherein the control system is arranged to detect an acoustic property of the liquid of the basis of the received pressure signal and to select the mode of operation in accordance with the detected property, the control system being arranged to deliver transducer control signals to the transducers, which control signals are derived from a common basic waveform that is specified by mode parameters, each mode of operation of the device is specified by a different set of mode parameters, the waveform comprises a jetting pulse and quench pulse following on the jetting pulse, and one of the mode parameters is a time delay between the start of the jetting pulse and the start of the quench pulse.

Abstract translation: 一种液体喷射装置，包括多个喷射单元，每个喷射单元布置成喷射液滴，并且包括喷嘴，连接到喷嘴的液体管道和布置成在液体中产生声压波的机电换能器 在所述管道中，所述装置还包括电子控制系统，其布置成从所述至少一个所述换能器接收压力信号，并且基于所接收的压力信号产生换能器控制信号，并且控制所述多个喷射的换能器 单元以从各种不同操作模式中选择的操作模式操作，其中所述控制系统被布置成检测所接收的压力信号的基础的液体的声学特性，并根据所述操作模式选择所述操作模式 检测到的属性，控制系统被布置成将换能器控制信号传送到换能器，该控制信号是d 从由模式参数指定的通用基本波形中发现，器件的每种操作模式由不同的模式参数集合指定，波形包括在喷射脉冲之后的喷射脉冲和骤冷脉冲，并且其中一种模式 参数是喷射脉冲开始和淬灭脉冲开始之间的时间延迟。