Oce-technologies B.v.

Oce-nederland B.v.

Canon Kabushiki Kaisha

Koninklijke Philips Corporation N.V.

Kumiai Chemical Industry Co., Ltd.

Canon Production Printing Holding B.v.

National Institute of Agrobiological Sciences

Oce Holding B.v.

Oc&eacute;-technologies B.v.

Oce-technology B.v.

Hans Reinten

Alex N Westland

Hendrik Jan Stolk

Peter Joseph Hollands

Johannes Mathieu Marie Simons

Hubertus M J M Boesten

Mark Gröninger

Klaas Verzijl

Pieter Gijsbertus Maria Kruijt

Marcus J Van Den Berg

David D L Wijngaards

Ronald Herman Schippers

Maikel A J Huygens

Antonius Johannes Maria Nellissen

Hermanus Mathias Joannes Rene Soemers

René J Van Der Meer

Hendrikus Wilhelmus Leonardus Antonius Maria Van Lierop

Reinder Pannekoek

Igor O Shklyarevskiy

Ronald Berkhout

Hendrikus J M Freriks

Youri De Loore

Igor Shklyarevskiy

Franciscus Richard Blom

Hendrik G J Rutten

René Van Der Meer

Anthonie H Lamper

Youri G J P De Loore

René´ J Van Der Meer

Mark Alexander Gr&ouml;ninger

Gerardus Johannes Catharina Mooren

Andr&eacute; Jozef Christiaan Gerardus Erren

Thomas P Huijgen

Johannes Antonius Theodorus Gollatz

Henricus C M Krijnen

Youri GjP De Loore

Youri GJP De Loore

Henricus CM Krijnen

Hubertus MJM Boesten

David DL Wijngaards

Mark A Gröninger

Pieter GM Kruijt

Johannes MM Simons

An inkjet print head includes a plurality of droplet jetting devices. The plurality of droplet jetting devices is formed of a nozzle layer defining, for each of the plurality of droplet jetting devices, a nozzle, a membrane layer carrying, on a membrane, a restrictor layer and an actuator for generating pressure waves in a liquid in a pressure chamber that is connected to the nozzle. The actuator is positioned in an actuator chamber in the restrictor layer, and a distribution layer defining a supply line for supplying the liquid to the pressure chamber. The restrictor layer includes an inlet restrictor having a cross-section and an outlet restrictor positioned on opposites sides of the actuator and having a cross-section that is different from the cross-section of the inlet restrictor.

Inkjet print head with continuous flow and pressure pulse dampening

A liquid jetting device is arranged to eject a droplet of a liquid. The device includes a nozzle, a liquid duct connected to the nozzle, an electro-mechanical transducer arranged to create an acoustic pressure wave in the liquid in the duct, and an electronic control system arranged to apply to the transducer a voltage signal having a waveform configured for ejecting a droplet from the nozzle. The waveform is further configured to quench a residual acoustic pressure wave in the liquid duct and includes a jet pulse, a subsequent first quench pulse having a polarity opposite to that of the jet pulse, and a subsequent second quench pulse having the same polarity as the jet pulse.

Liquid jetting device

A process of manufacturing droplet jetting devices includes bonding together a nozzle wafer defining nozzles of the jetting devices, a membrane wafer carrying, on a membrane, actuators for generating pressure waves in a liquid in pressure chambers that are connected to the nozzles, and a distribution wafer forming a distribution layer that defines supply lines for supplying the liquid to the pressure chambers from a liquid reservoir formed on a side of the distribution layer opposite to the membrane wafer; and dicing the bonded wafers. The distribution layer has a thickness larger than the thickness of each of the other two wafers. A restrictor for controlling the inertance of the liquid supply line is formed through the distribution layer in a direction normal to the plane of that layer.

Process of manufacturing droplet jetting devices

An inkjet print head comprises a fluid channel, the fluid channel including a pressure chamber; a piezo actuator including an active piezo stack and a membrane, the active piezo stack being provided at a surface of the membrane and the membrane forming a flexible wall of the pressure chamber, and a cavity having a cavity dimension determining a wall dimension of the membrane. The method of manufacturing such a print head includes selecting a desired actuator compliance; manufacturing a first print head layer including the piezo actuator; determining at least one actual actuator property of the piezo-actuator; determining a desired wall dimension based on the actual actuator property such that the combination of the piezo actuator and the membrane having the desired wall dimension provides for the desired actuator compliance; and manufacturing a second print head layer including the cavity.

Method of manufacturing an inkjet print head

A MEMS chip having at least two chip components bonded together by means of an adhesive layer that is applied to at least one of two mating bonding surfaces of the two components, wherein a pattern of finely distributed micro-cavities is formed in at least one of the two mating bonding surfaces, said micro-cavities being arranged to accommodate a major part of the adhesive.

MEMS chip and method of manufacturing a MEMS chip

In a print head having a bimorph thin-film piezo actuator, the piezo-electric actuator is arranged on a membrane at a first side of the piezo-electric actuator and a passive layer is arranged on the piezo-electric actuator at a second side of the piezo-electric actuator, wherein the second side is opposite to the first side. The membrane is more compliant, at least in a lateral direction, for contraction than the passive layer. Thus, a bending direction of the actuator is affected. As a consequence, there is no need for a bias voltage on the actuator during a standby state of the print head. Omitting the bias voltage during standby results in an increased lifetime and stability of the actuator assembly.

Inkjet print head with improved lifetime and efficiency

A method of controlling a pressure of a fluid in a pressure chamber, which pressure chamber is delimited by an actuator membrane having a first piezoelectric portion arranged in a central zone of the actuator membrane and at least one second piezoelectric portion arranged in at least one peripheral zone of the actuator membrane; and an ink jet printing device. In a neutral stage, a first flexure state of the actuator membrane is provided by applying first and second voltages to respective piezoelectric portions. In an activation stage, the first and second voltages are temporarily varied, without reversing their polarity, such that a curvature of the central part of the actuator membrane and a curvature of the peripheral part of the actuator membrane are changed in opposite directions, in order to expell a droplet of fluid through a nozzle.

Operating a piezoelectric actuator membrane of a pressure chamber

A droplet generating device includes a wafer with a recess that defines a pressure chamber, a flexible membrane bonded to the wafer so as to cover the recess and form a wall of the pressure chamber, and an actuator attached to the membrane for flexing the membrane to generate a pressure wave in a liquid in the pressure chamber, the pressure chamber having a first port connected to a liquid supply line, and a second port connecting the pressure chamber to a nozzle, at least one of the ports being arranged adjacent to the membrane, wherein the wafer forms at least one island portion that projects into the at least one of the ports, engages the membrane and divides the port into at least two separate passages, and wherein the at least one island portion is arranged to delimit a flexing part of the membrane on a side of the at least one of the ports.

Droplet generating device

A droplet ejection device includes a pressure chamber; a nozzle orifice arranged in fluid connection with the pressure chamber; an actuator system for generating a pressure wave in a liquid present in the pressure chamber; and an obstruction member arranged in the pressure chamber in a position opposite to the nozzle orifice. The obstruction member comprises a first surface facing the nozzle orifice and rigidly coupled to a wall of the pressure chamber via a support. The support is arranged near the first surface of the obstruction member. The droplet ejection device according to the present invention may further comprise a structured nozzle inflow means which provides a gradual transition from the hollow shaped liquid passage to the nozzle orifice. The droplet ejection device prevents or at least mitigates air entrapment in dead volumes present in the interior of the droplet ejection device.

Droplet ejection device

A droplet ejection device comprising a flow passage, a nozzle orifice formed in a wall of the flow passage, a circulation system for circulating a liquid through the flow passage, and an actuator system for generating a pressure wave in the liquid in the flow passage, wherein an obstruction member is arranged in the flow passage in a position opposite to the nozzle orifice and projecting towards the nozzle orifice.

A print head comprises a pressure chamber in fluid communication with a nozzle and an actuator structure in operative communication with the pressure chamber for generating a pressure wave in the pressure chamber. The actuator structure comprises a membrane, wherein a first surface of the membrane forms a flexible wall of the pressure chamber and a piezo actuator, wherein the piezo actuator is arranged on a second surface of the membrane, the second surface being opposite of the first surface, such that the membrane is deformed at the position of the piezo actuator upon actuation of the piezo actuator. In the print head, the membrane is pivotably clamped between a first structure layer and a second structure layer such that the membrane pivots at the location of clamping upon deformation of the membrane due to actuation of the piezo actuator.

Inkjet print head having a pivotably supported membrane and method for manufacturing such a print head

An ink jet printing device includes a pressure chamber, a first actuator membrane being arranged to form a first flexible wall of the pressure chamber, a first piezo-electric part being operatively connected to a surface of the first actuator membrane, a second actuator membrane being arranged to form a second flexible wall of the pressure chamber and a second piezo-electric part being operatively connected to a surface of the second actuator membrane, wherein the second flexible wall is mechanically decoupled from the first flexible wall.

Inkjet print head having two actuator membranes

A method of forming an array of piezoelectric actuators on a membrane () which includes the steps of preparing a piezoelectric comb-like structure having an array of islands that are integrally connected by a continuous top portion and that form piezoelectric layers of the actuators, the islands having an electrode at a bottom side, attaching the comb-like structure with its bottom electrode to a surface of the membrane, removing the continuous top portion of the comb-like structure to thereby separate the actuators from one another, and forming top electrodes on the top surfaces of the piezoelectric layers of the actuators.

Method of forming an array of piezoelectric actuators on a membrane

An ink supply assembly includes at least one inlet port. At least one outlet port is connected to the inlet port via an ink cavity and is adapted to be connected to an ink discharge unit of an ink jet device. The ink supply assembly has a sandwich structure formed by at least two plate members and a foil that is interposed therebetween and has a part forming a wall of said ink cavity. At least one of the plate members defines a pressure equalization chamber adjacent to the ink cavity and separated therefrom by the foil.

Ink supply assembly for an ink jet printing device

A method of manufacturing a piezoelectric ink jet device having a pressure chamber, a flexible membrane delimiting the pressure chamber, a piezoelectric actuator mounted on the membrane, and a rigid substrate attached to the side of the membrane carrying the actuator, which includes the steps of providing the piezoelectric actuator with an electrode on at least one side, attaching the actuator with its electrode side to a carrier plate, bonding the rigid substrate to the side of the carrier plate carrying the actuator, and removing material from the carrier plate on the side opposite to the actuator and leaving only a thin layer of the carrier plate which then forms the membrane.

Method of manufacturing a piezoelectric ink jet device

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