Abstract: An inkjet nozzle assembly includes a nozzle chamber comprising a floor and a roof. The roof has a nozzle opening defined therein, and a moving portion moveable towards the floor. The assembly further comprises a thermal bend actuator, defining at least part of the moving portion of the roof, for ejecting ink through the nozzle opening. The thermal bend actuator comprises an upper first beam for connection to drive circuitry and a lower second beam mechanically cooperating with the first beam, such that when a current is passed through the first beam, the first beam expands relative to the second beam resulting in bending of the moving portion towards the floor of the nozzle chamber.

Abstract: A micro-electromechanical integrated circuit device comprises a substrate; drive circuitry positioned on the substrate; and a plurality of elongate actuators. Each actuator comprises a fixed end portion fast with the substrate, a free end portion that is spaced from the substrate, and a heating circuit that is connected to the drive circuitry to heat the actuator. A portion of the actuator is formed of a material having a coefficient of thermal expansion such that the material is capable of performing work by thermal expansion. The heating circuit is positioned to generate differential thermal expansion and contraction when heated and cooled to cause reciprocal displacement of the free end portion of the actuator. Each actuator is a laminated structure having a first metal layer and a dielectric layer, the first metal layer being interposed between the dielectric layer and the substrate and defining the heating circuit.

Abstract: A process for making a fluid ejector head for a micro-fluid ejection device. In one embodiment, the process comprises depositing a thin film resistive layer on a substrate to provide a plurality of thin film heaters. The thin film resistive layer comprises a tantalum-aluminum-nitride material consisting essentially of AlN, TaN, and TaAl alloys, and containing from about 30 to about 70 atomic % tantalum, from about 10 to about 40 atomic % aluminum and from about 5 to about 30 atomic % nitrogen.

Abstract: An ink jet head includes a recording element substrate includes a plurality of ink supply ports and a supply port partition between adjacent ink supply ports; a substrate supporting portion supporting the recording element substrate at a back side thereof, the substrate supporting portion including ink supply passages corresponding to the ink supply ports and a supply passage partition corresponding to the supply port partition; a sealing material contacted to a side surface of the recording element substrate and to the substrate supporting portion; adhesive material fixing the opening partition and the supply passage partition to each other, wherein back sides of opposite ends of the recording element substrate with respect to an arranging direction of the ink supply ports are unfixed by the adhesive material to the substrate supporting portion.

Abstract: An inkjet printhead and a manufacturing method thereof. In the manufacturing method, a chip and a porous material are provided. A heating layer is formed on the chip. A conductive layer is formed on the heating layer, and includes a notch therein to define a heating area. A chamber for storing liquid is formed on the heating area, and includes a first side and a second side. The first side faces the heating area, and the second side is connected to the first side. The chamber is formed with an exit, from which the liquid is dispensed, on the second side. The porous material is disposed on the chamber, and the liquid flows to the chamber through the porous material.

Abstract: A printhead for an inkjet printer comprises a wafer assembly defining a plurality of spaced apart groups of ink supply channels and a plurality of groups of ink ejection nozzle arrangements. Each ink ejection nozzle arrangement comprises a nozzle chamber structure mounted to the wafer assembly. Each ink ejection nozzle arrangement further comprises an anchor extending from the wafer assembly in a location external to the nozzle chamber; and an elongate thermal actuator mechanism extending from the anchor and into the nozzle chamber. The thermal actuator mechanism comprises an elongate arm which terminates in a free end within the nozzle chamber, and a pair of layers of conductive material located on either side of the elongate arm. One of the layers is connected to a current supply for causing a differential thermal expansion in the elongate thermal actuator mechanism. A pit is defined adjacent each nozzle chamber structure for catching ink.

Abstract: A method and an apparatus for dispensing liquid are disclosed. The method includes the steps of storing one or more liquids in a thermal inkjet print head and providing a well plate having at least one well. At least one of the liquids is dispensed from the thermal inkjet print head into at least one well. The volume of the dispensed liquid is a fraction of the total required volume of the liquid in the at least one well, and the dispensing step is performed multiple times to dispense the required volume of the at least one liquid in at least one well.

Abstract: An inkjet printing head includes a substrate capable of storing a large volume of information by increasing a number of fuses without enlarging a space for arranging fuses capable of storing information according to the cutting or non-cutting of the fuses, and a selection circuit. For that purpose, two fuses are connected to a set of a drive element and a selection circuit.

Abstract: A liquid discharge head includes a substrate having a plurality of energy generating elements for generating heat energy for use in discharging liquid and a plurality of nozzles provided correspondingly to the plurality of energy generating elements. Each of the nozzles includes a chamber provided with the energy generating element, a second discharge portion, and a first discharge portion. The central axis of the second discharge portion is offset from the central axis of the first discharge portion in the nozzle arrangement direction.

Abstract: An ejection nozzle arrangement is provided having a fluid chamber having a wall and a fluid port, an arm extending through an aperture in the wall, a dynamic structure cantilevered from the wall adjacent the aperture, a static structure cantilevered from the wall adjacent the dynamic structure. The arm is connected to the dynamic and static structures at a point distal from the aperture such that thermal expansion of the dynamic structure moves the arm upwards in the chamber to eject fluid from the chamber through the port.

Abstract: A substantially inorganic planarization layer for a micro-fluid ejection head substrate and method therefor. The planarization layer includes a plurality of layers composed of one or more dielectric compounds and at least one spin on glass (SOG) layer having a total thickness ranging from about 1 microns to about 15 microns deposited over a second metal layer of the micro-fluid ejection head substrate. A top most layer of the planarization layer is selected from one or more of the dielectric compounds and a hard mask material.

Abstract: A nozzle arrangement for an inkjet printhead.

Abstract: A printhead and method of forming the printhead are provided. The method includes forming an ink feed passage through a print head substrate by providing a metallic substrate having a first surface and a second surface; providing an ink ejector structure on a first surface of the metallic substrate; providing a mask over the second surface of the metallic substrate to define the ink feed passage; and forming the ink feed passage from the second surface of the metallic substrate using a liquid etchant.

Abstract: An inkjet printhead includes a substrate having an array of nozzles grouped in nozzle pairs. Each nozzle pair has a common nozzle chamber and a single actuator configured to selectively eject ink from one or other of the nozzles in the nozzle pair.

Abstract: A printhead assembly is provided for a printer system. The printhead assembly includes an elongate substrate defining a channel and spaced apart sets of ink supply holes. An ink distribution arrangement is located within the channel and is configured to distribute ink to the sets of ink supply holes. A first plate is in engagement with the substrate to hold the ink distribution arrangement within the channel. A power supply arrangement is also located within the channel. A second plate is in engagement with the substrate so that the power supply arrangement is sandwiched between the plates and held within the channel.

Abstract: An epoxy resin composition, including: an epoxy resin (A) represented by Formula (1); an epoxy resin (B) having an epoxy equivalent of 220 or less and having twice or more epoxy groups in a molecule than epoxy groups of the epoxy resin (A); and a photocationic polymerization initiator (C), in which: the epoxy resins (A) and (B) constitute main components; and a weight of the epoxy resin (A) is 40% or more and a weight of the epoxy resin (B) is 30% or more with respect to a total weight of the epoxy resins (A) and (B): where: R represents a hydrogen atom, a methyl group, an ethyl group, a propyl group, or a t-butyl group; n represents an integer of 0 or more and 4 or less; and m represents an integer of 1 or more and 3 or less.

Abstract: A printhead is provided having at least first and second rows of print nozzles. Each nozzle has first circuitry of a first type arranged on an opposite side of the nozzle as second circuitry of a second type. The respective positions of the first and second circuitry of each nozzle of the first row are rotated 180 degrees relative to the respective positions of the first and second circuitry of each nozzle of the second row.

Abstract: A method of manufacturing an ink jet head which discharges ink, comprising: a step of preparing a silicon substrate; a step of forming a membrane having a layer in which a plurality of holes are disposed to constitute a filter mask, and a layer with which a first surface is coated in such a manner that the first surface is not exposed from the plurality of holes on the first surface of the substrate; a step of forming a close contact enhancing layer on the membrane formed on the substrate; a step of forming a channel constituting member on the close contact enhancing layer to constitute a plurality of discharge ports and a plurality of ink channels communicating with the plurality of discharge ports; a step of forming an ink supply port communicating with the plurality of ink channels in the silicon substrate by anisotropic etching from a second surface facing the first surface of the substrate; and a step of forming a filter in a portion of the close contact enhancing layer positioned in an opening of the in

Abstract: The inkjet printhead includes substrate having an ink feed hole formed to supply ink, a chamber layer stacked on the substrate, and including a plurality of main ink chambers formed therein with the ink feed hole therebetween and a plurality of compensation ink chambers formed therein between the main ink chambers that face each other; and a nozzle layer stacked on the chamber layer, and including a plurality of main nozzles corresponding to the main ink chambers and a plurality of compensation nozzles corresponding to the compensation ink chambers.

Abstract: An ink jet head circuit board is provided which has heaters to generate thermal energy for ink ejection. This board has the heaters formed with high precision to reduce their areas. It has provisions to protect the electrode wires against corrosion and prevent a progress of corrosion. The substrate is deposited with the thin first electrodes made of a corrosion resistant metal. Over the first electrodes the second electrodes made of aluminum are formed. The second electrodes are deposited with a resistor layer. The heater is formed in the gap between the first electrodes. With this construction, the heaters are formed without large dimensional variations among them. Should a defect occur in a protective layer above or near the heaters, a progress of corrosion can effectively be prevented because the material of the resistor layer is more resistant to encroachment than aluminum and the first electrodes are corrosion resistant.

Abstract: Provided is a micro-electromechanical nozzle arrangement for an inkjet printhead. The arrangement includes a substrate defining an inverted pyramidal ink chamber with a vertex thereof terminating at an ink supply channel through the substrate, said substrate having a layer of CMOS drive circuitry. The arrangements also includes a roof structure connected to the drive circuitry layer and covering the ink chamber, the roof structure defining a fluid ejection nozzle rim above said chamber in addition to ink flow guide rails to minimize wicking along the nozzle rim according to surface tension effects of ink in the chamber. Also included is a plurality of actuators displaceable with respect to, and radially spaced about, the nozzle rim, and in between, the guide rails.

Abstract: A pagewidth printhead assembly comprising an elongate support member, the elongate support member includes a core element defining separate ink reservoirs and a laminate structure at least partially surrounding the core element. A plurality of printhead integrated circuits is mounted to the core element so as to be substantially aligned with one another along the elongate support member. The laminate structure includes at least a first layer of a first material adjacent the core element, a second layer of a second material adjacent the first layer, and a third layer of the first material adjacent the second layer, and the coefficient of thermal expansion of the first material is different to the coefficient of thermal expansion of the second material. The effective coefficient of thermal expansion of the support member is substantially equal to that of the plurality of printhead integrated circuits.

Abstract: A nozzle assembly for an inkjet printhead includes a substrate assembly defining an ink inlet aperture; a nozzle having an endless wall portion extending from the substrate assembly and a moveable crown portion from which a skirt portion depends, the nozzle defining a nozzle chamber in fluid communication with the ink inlet aperture and a nozzle opening in fluid communication with the nozzle chamber; an anchor extending from the substrate assembly; and a thermal bend actuator connected between the anchor and the nozzle via a lever arm, the thermal bend actuator operable to move the crown and skirt portions relative to the endless wall portion to eject ink from the nozzle opening. The endless wall portion defines an inwardly directed lip serving as a fluidic seal for inhibiting an escape of ink during displacement of the crown and skirt portions.

Abstract: A heater assembly for a printhead is provided having a heating element including a heating layer and a non-heating layer, and a heat conduction means positioned in the middle of the non-heating layer so as to be spaced from the heating layer to conduct heat generated by the heating element away from the actuator assembly.

Abstract: An ink jet printhead with an array of nozzles unit cells 1. Each of the unit cells having one or more heaters 10 configured to form a gas bubble 12 in ejectable liquid held in the nozzle chamber. The generation of the bubble 12 causes the ejection of a drop 16 of an ejectable liquid (such as ink) through an ejection aperture 5 in each nozzle 3, to effect printing. The nozzle unit cells 1 are manufactured using semiconductor and micro mechanical techniques such that the spacing between adjacent nozzle apertures 5 in the printhead is less than 100 microns. With the use of semiconductor and micro mechanical manufacturing techniques, the dimension of the nozzles structures can be kept relatively small without significant increases in manufacturing costs. Therefore, the nozzle density in the printhead can be increased for greater printing resolution.

Abstract: An ink ejection nozzle arrangement for an inkjet printer includes a wafer substrate with an etched ink chamber and ink channel leading to the chamber; ink ejection nozzle defined over the chamber with an ejection port etched therein; a dielectric actuator arm attached to the substrate via a post on the substrate, the arm having a heating means formed of an electrically conductive material attached at a lower portion thereof proximate the post, wherein the arm extends through a slot in the chamber; and paddle fast with the arm inside the chamber, the paddle interposed between the ink channel and the ejection port. The slot in the chamber defines corrugations to inhibit leaking of ink from the slot.

Abstract: A liquid ejecting head includes plural ejection outlets for ejecting droplets; liquid flow paths in fluid communication with the ejection outlets; and a liquid supply opening for supplying the liquid to the liquid flow paths. The ejection outlets include first and second ejection outlets disposed at least at one side of the liquid supply opening and are staggered. The first ejection outlets are nearer to the liquid supply opening than the second ejection outlets. Each of first recording elements corresponding to the first ejection outlets includes one rectangular heat generating resistor having a long side extending along a direction crossing with an arranging direction of the ejection outlets. Each of second recording elements corresponding to the second ejection outlets comprises plural rectangular heat generating resistors which are adjacent to each other at long sides thereof and are electrically connected in series.

Abstract: A micro-electromechanical nozzle arrangement for an inkjet printhead includes a substrate defining an inverted pyramidal ink chamber with a vertex thereof terminating at an ink supply channel defined by the substrate, said substrate having a layer of CMOS drive circuitry; a roof structure connected to the drive circuitry layer and covering the ink chamber, the roof structure defining a fluid ejection nozzle rim above said chamber; a plurality of actuators fast with and displaceable with respect to the roof structure, the actuators radially spaced about the nozzle rim between the guide rails, each actuator having a serpentine heater element configured to expand thermally upon receiving current from the drive circuitry thereby moving said actuators into the chamber and increasing a fluid pressure inside the chamber to eject a drop of ink via the ejection nozzle, wherein each actuator is cantilevered to a heater element in a bendable manner; and a central arm which having metal and PTFE portions to provide struc

Abstract: An inkjet recording system includes an inkjet recording head in which a part of wall face of a pressure chamber in which a nozzle is provided is formed of a piezoelectric element. Centerline average roughness Ra of the piezoelectric element is 0.05 to 2 ?m, viscosity of the ink is 2.0 to 10.0 mPa·s, and the following expression (1) is satisfied; r ? ? ? ? ? cos ? ? ? 2 ? ? ? ? 0.07 ( 1 ) wherein r represents centerline average roughness (?m) of surface of piezoelectric element forming wall face of the pressure chamber, ? represents surface tension (mN/m) of ink, ? represents viscosity of ink (mPa·s), and ? represents contact angle (degree) of ink with respect to piezoelectric element.

Abstract: A recording element substrate includes a substrate; an insulating layer disposed on the substrate; a plurality of heating portions which are arranged on the insulating layer and which produce thermal energy used to eject a liquid; and a plurality of heat conduction members, each being located between adjacent heating portions with respect to an arrangement direction of the heating portions, the heat conduction members being located between the substrate side principal surface of the insulating layer and the heating portion side principal surface of the insulating layer and having higher thermal conductivity than the insulating layer. The heat conduction members are in contact with a heat conduction layer which has higher thermal conductivity than the insulating layer.

Abstract: The invention provides for a nozzle arrangement for an inkjet printer. The arrangement includes a wafer substrate defining a chamber with an ink inlet and ejection port, the substrate having a micro-electromechanical drive layer. The arrangement also includes a paddle dividing the chamber into an ink chamber and a nozzle chamber, and an actuating arm coupled to the paddle. The arm includes an outer arm portion mechanically linked to an inner arm portion via posts electrically isolating the inner arm portion from the outer arm portion. The arm is pivotal with respect to the substrate during operative electrical thermal expansion of the inner arm portion displacing the paddle towards the ejection port.

Abstract: The present invention includes as one embodiment an ink jet printhead having a circuit with plural resistors and a power bus. The printhead includes a metal stack formed within the circuit, which is comprised of a first metal layer and a second metal layer and at least one power via. The power via is formed within the circuit as an interface between the first metal layer and the second metal layer and acts as a separation barrier between conductive portions of the resistors and the power bus.

Abstract: A microfluidic architecture is disclosed. The microfluidic architecture includes a substrate having an edge and a thin film stack established on at least a portion of the substrate adjacent the edge. The thin film stack includes a non-conducting layer and a seed layer, where the seed layer is positioned such that a portion of the non-conducting layer is exposed. A chamber layer is established on at least a portion of the seed layer. The non-conducting layer, the seed layer, and the chamber layer define a microfluidic chamber. A layer having a predetermined surface property is electroplated on the chamber layer and on at least one of another portion of the seed layer and the exposed portion of the non-conducting layer.

Abstract: A nozzle is provided for an inkjet printhead. The nozzle includes a wafer assembly defining an ink supply channel. A chamber roof layer is supported by the wafer assembly. The chamber roof layer defines a nozzle chamber in fluid communication with the ink supply channel and a nozzle aperture through which ink in the nozzle chamber can be ejected. A thermal actuator is sandwiched between the wafer assembly and the chamber roof layer. The thermal actuator includes a heater element which, upon actuation, ejects ink from the nozzle chamber out through the nozzle aperture. The chamber roof layer defines an external patterned surface surrounding the nozzle aperture, the patterned surface being configured to inhibit dust particles from sticking to the chamber roof layer.

Abstract: A printhead structure is provided comprising a moulding, silicon wafer and a plurality of microelectromechanical ink ejection devices. The moulding at least defines a fluid reservoir and a first passage in fluid communication with the fluid reservoir. The silicon wafer at least defines a second passage spaced from the first passage and a third passage arranged to provide fluid communication between the first and second passages. The microelectromechanical ink ejection devices are in fluid communication with the second passage.

Abstract: Provided is a unit cell arrangement for an inkjet printhead. The unit cell arrangement includes a substrate that defines an ink inlet and sidewalls supporting a roof portion on the wafer substrate to form an ink chamber. The roof portion defines at least one nozzle rim. The unit cell also includes a heater element suspended in the chamber between the sidewalls for thermal cavitation of ink in the chamber to facilitate ink ejection via the nozzle rim. Further included is a rectifying valve arranged in the ink inlet to provide decreased hydraulic resistance to ink flowing into the chamber than ink flowing out of the chamber in order to reduce fluidic cross talk between chambers of similar unit cells on the substrate and to improve ink refill times of the chambers.

Abstract: MEMS devices and methods of fabrication thereof are described. In one embodiment, the MEMS device includes a bottom alloy layer disposed over a substrate. An inner material layer is disposed on the bottom alloy layer, and a top alloy layer is disposed on the inner material layer, the top and bottom alloy layers including an alloy of at least two metals, wherein the inner material layer includes the alloy and nitrogen. The top alloy layer, the inner material layer, and the bottom alloy layer form a MEMS feature.

Abstract: Micro-fluid ejection heads and methods for extending the life of micro-fluid ejection heads. One such micro-fluid ejection head includes a substrate having a plurality of thermal ejection actuators. Each of the thermal ejection actuators has a resistive layer and a protective layer thereon. A flow feature member is adjacent the substrate and defines a fluid feed channel, a fluid chamber associated with at least one of the actuators and in flow communication with the fluid feed channel, and a nozzle. The nozzle is offset to a side of the chamber opposite the feed channel. A polymeric layer having a degradation temperature of less than about 400° C. overlaps a portion of the at least one actuator associated with the fluid chamber and positioned less than about five microns from at least an edge of the at least one actuator opposite the fluid feed channel.

Abstract: Methods for fabricating micro-fluid ejection heads and micro-fluid ejection heads are provided herein, such as those that use non-conventional substrates. One such micro-fluid ejection head includes a substrate having first and second glass layers disposed adjacent to a surface thereof and a plurality of fluid ejection actuators disposed adjacent to the second glass layer. The first glass layer is thicker than the second glass layer and the second glass layer has a surface roughness of no greater than about 75 ? Ra.

Abstract: A method of making a micro-fluid ejection head structure and micro-fluid ejection heads made by the method. The method includes applying a tantalum oxide layer to a surface of a fluid ejection actuator disposed on a device surface of a substrate so that the tantalum oxide layer is the topmost layer of a plurality of layers including a resistive layer, and a protective layer selected from a passivation layer, a cavitation layer, and a combination of a passivation layer and a cavitation layer. The tantalum oxide layer has a thickness (t) that satisfies an equation t=(¼*W/n), wherein W is a wavelength of radiation from a radiation source, and n is a refractive index of the tantalum oxide layer. A photoimageable layer is also applied to the substrate. The photoimageable layer is imaged with the radiation source and then developed.

Abstract: A printhead is provided having a fluid ejection nozzles which each have a substrate, a layer of drive circuitry deposited on the substrate, and subsequent etchant layers deposited on the drive circuitry to define a nozzle chamber with walls and a roof structure defining a fluid ejection port. Each nozzle also has a stacked capacitive actuator arranged in the chamber. The actuator has alternate electrode plates sandwiched between a compressible polymer, wherein activation of the stacked actuator draws the electrode plates together to compress the polymer storing energy therein, with subsequent de-activation releasing the energy to eject fluid within the chamber from the ejection port.

Abstract: Methods for fabricating micro-fluid ejection heads and micro-fluid ejection heads are provided herein, such as those that use non-conventional substrates. One such micro-fluid ejection head includes a substrate having first and second glass layers disposed adjacent to a surface thereof and a plurality of fluid ejection actuators disposed adjacent to the second glass layer. The first glass layer is thicker than the second glass layer and the second glass layer has a surface roughness of no greater than about 75 ? Ra.

Abstract: An inkjet nozzle assembly comprises: a nozzle chamber for containing ink, the nozzle chamber having a nozzle opening defined in a roof thereof; and a bubble-forming heater element positioned in the nozzle chamber. The heater element is suspended in the nozzle chamber and parallel with a plane of the roof. The heater element is comprised of solid material having a total mass of less than 10 nanograms.

Abstract: An ink-jet printhead and a manufacturing method thereof include a substrate on which a space portion is formed, a passage plate installed on the substrate in which an ink chamber is formed to store ink, a nozzle plate installed at a top surface of the passage plate in which a nozzle is formed to eject the ink, and a vibration plate disposed between the substrate and the passage plate to generate a pressure for ejecting the ink by changing a volume of the ink chamber.

Abstract: A heater stack includes first strata configured to form a fluid heater element responsive to energy from repetitive electrical activation and deactivation to fire repetitive cycles of heating and ejecting fluid from an ejection chamber above the fluid heater element and second strata overlying the first strata and contiguous with the ejection chamber to provide protection of the fluid heater element. The first strata includes a substrate and a heater substrata overlying the substrate and including a resistive layer having lateral portions spaced apart, a central portion extending between the lateral portions and defining the fluid heater element, and transitional portions interconnecting the central portion and lateral portions and elevating the central portion relative to the lateral portions and above the substrate to form a gap between the lateral portions and between the central portion and substrate insulating the substrate from the fluid heater element and a planar upper surface on the heater substrata.

Abstract: A fin-shaped heater stack includes first strata configured to support and form fluid heater elements responsive to repetitive electrical activation and deactivation to produce repetitive cycles of ejection of a fluid, and second strata on the first strata to protect the fluid heater elements from adverse effects of the repetitive cycles of fluid ejection and of contact with the fluid. The first strata include a substrate having a front surface, and heater substrata supported on the front surface. The heater substrata have opposite facing side surfaces which extend approximately perpendicular to the front surface and an end surface interconnecting the side surfaces which extends approximately parallel to the front surface such that the heater substrata is provided in either an upright or inverted fin-shaped configuration on the substrate with the fluid heater elements forming the opposite facing side surfaces of the heat substrata.

Abstract: An inkjet printhead with planar thermal actuators, with contacts directly deposited onto the CMOS electrodes and suspended heater element, which avoids hotspots caused by vertical or inclined surfaces so that the contacts can be much smaller structures without acceptable increases in resistive losses. Low resistive losses preserves the efficient operation of a suspended heater element and the small contact size is convenient for close nozzle packing on the printhead.

Abstract: A liquid ejection head substrate includes a primary conductive layer; an insulating layer; a pair of secondary conductive layers; a first connecting portion where the primary conductive layer is electrically connected to the secondary conductive layers, the first connecting portion penetrating the insulating layer; and a second connecting portion whose contact area is smaller than that of the first connecting portion. In the secondary conductive layers, a voltage is applied such that a first secondary conductive layer has a higher potential than a second secondary conductive layer.

Abstract: A printhead for an inkjet printer includes a wafer defining a plurality of nozzle chambers and a plurality of ink supply channel in fluid communication with the plurality of nozzle chambers for supplying the plurality of nozzle chambers with ink; an ink ejection port associated with each nozzle chamber; and a plurality of actuators associated with each nozzle chamber, the plurality of actuators each including a petal formation. A plurality of petal formations are arranged around an ink ejection port of each nozzle chamber to annularly surround the ink ejection port. Each actuator is operable to displace a respective petal formation into the nozzle chamber.

Abstract: A nozzle cell of a printhead is provided which has a multi-layer substrate defining a fluid inlet, side walls extending from the substrate around the fluid inlet and comprising walls of silicon nitride encapsulating hardened photoresist, an apertured roof supported by the side walls to define a chamber, and a heater within the chamber, the heater heating the fluid in the chamber so that bubbles are generated therein to cause ejection of the fluid from a nozzle defined with the apertured roof.