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 printhead is provided having a plurality of nozzles and a plurality of heater elements each for heating an ejectable liquid to cause ejection of a drop of the ejectable liquid from a respective one of the nozzles. Each heater element is configured such that drops having drop volumes of less than 2 picoliters are ejected with a temperature rise in the ejectable liquid of less than 40 degrees Celsius above ambient temperature.

Abstract: An apparatus and method for controlling temperature profiles in ejection mechanisms is provided. A heater includes a first resistor segment having an electrical resistivity, a second resistor segment; and a coupling segment positioned between the first resistor segment and the second resistor segment. The coupling segment has an electrical resistivity, wherein the ratio of the resistivity of the coupling segment to the resistivity of the first resistor segment is substantially zero. Alternatively, the first resistor segment has an electrical conductivity and the coupling segment has an electrical conductivity, wherein the electrical conductivity of the coupling segment is greater than the electrical conductivity of the first resistor segment.

Abstract: Provided is a pagewidth printhead arrangement for an inkjet printer having a print engine controller. The arrangement has a wafer substrate that defines a plurality of ink inlets. A plurality of nozzles each including side walls are located on a wafer substrate with a roof portion attached to said walls to define an ink chamber. The roof portion defines an ejection port. The arrangement also includes an inlet defined in the substrate to supply the ink chamber with ink. A heater element is suspended between the side walls in the ink chamber, so that when electrical actuation energy is applied to respective heater elements, a vapour bubble is formed in the ink leading to a pressure increase in the chamber thereby ejecting the ink via the ejection port. The controller is configured to actuate the heater element to facilitate weighted ink drop volumes to be ejected from the nozzle arrangement.

Abstract: A printhead integrated circuit includes: a plurality of nozzle chambers disposed on a substrate; a heater element positioned in each nozzle chamber; drive circuitry for supply power to each heater element; and a plurality of ink supply channels defined in the substrate for supplying fluid to the nozzle chambers. Each heater element consists of solid material having a mass of less than 10 nanograms. In use, the solid material is heated to cause formation of a gas bubble inside each nozzle chamber.

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: An inkjet printhead is provided having a substrate defining inlet passages, sidewalls extending from the substrate, and a nozzle plate supported by the sidewalls and defining nozzle apertures. The nozzle plate, the sidewalls and the substrate define chambers. The printhead further has a heater element suspended within each of the chambers. The heater element has a planar structure parallel to the plane of the nozzle plate, and a spacing between the heater element and each sidewall of the chamber is between 0.1 microns and 20 microns. The heater element heats a liquid in the chamber to form a gas bubble. The gas bubble causes the ejection of a drop of the liquid through the nozzle aperture.

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 method of ejecting fluid from a printhead nozzle is provided. The printhead nozzle has a fluid chamber, a fluid ejection port, electrodes on opposite sides of the chamber and a heater element suspended between the electrodes. The heater element has a cross section with a lateral dimension at least triple that of the thickness of heater element. The he thickness of the heater element being less than 0.3 microns. In the method the heater element is heated to a temperature above the boiling point of the fluid to form a gas bubble that causes ejection of a drop of the fluid from the ejection port, and the chamber is supplied with a replacement volume of the fluid equivalent to the ejected drop.

Abstract: A printhead die (200) for an inkjet-printing device includes a substrate (302), a heating resistor, and an edge protection layer (209) The heating resistor is formed on the substrate, and has one or more edges The heating resistor is operative to cause an ink droplet to be ejected from the inkjet-printing device upon sufficient current flowing through the heating resistor resulting in a bubble nucleating within ink at the heating resistor and thereafter collapsing at the heating resistor The edge protection layer covers just the edges of the heating resistor in order to at least substantially protect the heating resistor from becoming damaged due to collapsing of the bubble at the heating resistor

Abstract: In order to hermetically seal more surely a gap between a back surface of a liquid discharge substrate and a front surface of a support member, and an electrode portion etc., without adversely affecting discharge performance, a liquid discharge head includes a first sealing resin coated on a portion between the liquid supply port and the pad on the support surface so as to surround a tip end portion at the liquid supply port of the support member and a second sealing resin for sealing a gap between the support member and the liquid discharge substrate, and a peripheral part of the liquid supply port.

Abstract: A MEMS vapor bubble generator with a chamber for holding liquid and a heater positioned in the chamber for heating the liquid above its bubble nucleation point to form a vapor bubble; wherein, the heater has a microstructure with a grain size less than 100 nanometers.

Abstract: A heating structure of an inkjet printhead and an inkjet printhead including the heating structure. The heating structure includes a substrate, a heater formed on the substrate, an electrode formed on the heater, a passivation layer formed to cover the heaters and the electrodes, and carbon nanotubes (CNTs) formed in the passivation layer.

Abstract: A nozzle arrangement is provided for ejecting ink. The nozzle arrangement includes a substrate assembly defining an ink inlet passage. A nozzle chamber structure extends from the substrate assembly to define a nozzle chamber in fluid communication with the ink inlet passage. The nozzle chamber structure defines an aperture through which ink in the nozzle chamber can be ejected. A pair of parallel heater elements extends from the nozzle chamber structure and into the nozzle chamber, and can be supplied with current so that ink in the nozzle chamber is ejected out through the aperture. The heater elements include legs embedded within the nozzle chamber structure and terminate in feet embedded within the substrate assembly.

Abstract: A nozzle arrangement ejects ink through apertures that each have an externally projecting peripheral rim. The nozzle arrangement has a substrate assembly defining an ink inlet passage and including heater element drive circuitry, a nozzle chamber structure formed on the substrate assembly, the nozzle chamber structure defining nozzle chambers in fluid communication with the ink inlet passage and apertures through which ink in each of the nozzle chambers can be ejected, and heater elements positioned between the drive circuitry and the apertures. The heater elements are connected to the drive circuitry and are individually supplied with current to eject ink from one of the apertures respectively.

Abstract: A method of ejecting drops of an ejectable liquid from a printhead that has a plurality of nozzles, and a bubble forming chamber corresponding to each of the nozzles respectively. The bubble forming chambers contain a bubble forming liquid and at least one heater associated with each of the bubble forming chambers respectively. The heater has electrodes for connection to a power supply and heater elements configured for thermal contact with the bubble forming liquid. The heater element is supported within the bubble forming chamber by the electrodes such that it does not contact the bubble forming chamber. The method uses the steps of placing the bubble forming liquid into thermal contact with the heater elements, and heating the heater elements to a temperature above the boiling point of the bubble forming liquid to form a gas bubble such that a drop of an ejectable liquid is ejected through the corresponding nozzle.

Abstract: This invention provides for a nozzle arrangement for a printhead. The nozzle arrangement includes a substrate that defines an ink inlet passage. A nozzle plate is arranged on the substrate and defines an ink chamber in fluid communication with the ink inlet passage and a nozzle aperture in fluid communication with the ink chamber. A nozzle enclosure is arranged on the nozzle plate about the aperture and is configured to isolate the aperture from at least one adjacent aperture. The arrangement also includes a heater element suspended within the chamber and configured to produce ink cavitation when heated to eject a drop of ink via the nozzle aperture. The heater element is configured as a looped element so that no solid surface thereof is in the vicinity of a point of collapse of the produced cavitation.

Abstract: An inkjet printhead having a high density array of micro-electromechanical nozzles arrangements. Each arrangement comprises side walls located on a wafer substrate with a roof layer deposited on said walls to define an ink chamber, the roof layer defining a nozzle aperture; an inlet defined in the substrate to supply the ink chamber with printing fluid; and at least one heater element having a mass of less than 250 picograms suspended between the side walls in the chamber, the heater element operable to form a vapor bubble when electrical actuation energy of less than 120 nanojoules is applied thereto, said heater element having an annular shape with a point of collapse of the bubble near a center thereof.

Abstract: A liquid recording head includes a thermal energy generating element, having a flat plate configuration, for generating a bubble by thermal energy; a pressure chamber in which the thermal energy generating element is provided; a flow path for introducing liquid into the pressure chamber; a supply port in fluid communication with the flow path; and an ejection outlet provided at a position opposing the thermal energy generating element in fluid communication with the pressure chamber. The thermal energy generating element includes a first major surface facing the ejection outlet and a second major surface opposite the first major surface, and a distance between the first major surface and a ceiling surface of the pressure chamber in which the ejection outlet is formed is shorter than a distance between the second major surface and a bottom surface of the pressure chamber.

Abstract: A printer system is provided which incorporates a printhead having nozzles, bubble forming chambers and heater and non-heater elements disposed in each of the chamber to overlay one another with a space therebetween. The heater and non-heater elements are formed of the same material and the heater elements are connected to electrodes so as to be in thermal contact with a bubble forming liquid in the chambers. Heating the heater elements with the electrodes to a temperature above the boiling point of the bubble forming liquid forms a gas bubble that causes the drop ejection of ejectable liquid through the nozzles. Each heater element has a bubble nucleation section which has a smaller cross section than the remainder of that heater element. Each chamber has a circular cross section and each heater element has arcuate sections that are concentric with the circular cross section.

Abstract: A nozzle assembly for an inkjet printhead is disclosed. The nozzle assembly includes an inkjet nozzle having an actuator for ejecting an ink droplet from the inkjet nozzle when a resistive element of the actuator is heated by an electrical current. A drive transistor provides an energy pulse to the resistive element of the actuator, and control logic controls the drive transistor. The drive transistor, control logic and inkjet nozzle covers an area of less than 20,000 ?m2.

Abstract: An electrical device includes an interconnect and a pair substrates at least one of which includes an integrated circuit, the pair of substrates being bonded together by a bond that includes a structure having multiple widths and a composition that is selected from the group consisting of a graded material and a first material upon a second material.

Abstract: A nozzle assembly for an inkjet printhead is disclosed. The nozzle assembly includes an inkjet nozzle having an actuator for ejecting an ink droplet from the inkjet nozzle when a resistive element of the actuator is heated by an electrical current. A drive transistor provides an energy pulse to the resistive element of the actuator, and control logic controls the drive transistor. The aperture of the inkjet nozzle through which the ink droplet is ejected has a diameter of less than 15 ?m.

Abstract: A printhead is provided having a plurality of chambers on a substrate, each chamber having a nozzle, a heater arranged in each chamber so as to heat fluid within the chamber to form a gas bubble therein and thereby cause ejection of a drop from the corresponding nozzle, and a plurality of passages formed in the substrate so that each passage supplies the fluid to an associated one of the chambers. Each heater includes solid material and has a mass of less than 10 nanograms of the solid material, which is configured to be heated to cause formation of the gas bubble.

Abstract: Provided is an inkjet printhead integrated circuit that has a wafer substrate that has an ink passage, and a nozzle plate supported on the substrate by side walls to define an ink chamber supplied with ink via the ink passage. The nozzle plate has an ink ejection port corresponding to the ink chamber. A heater element is bonded to the nozzle plate inside the chamber for vaporising ink to generate a vapour bubble that ejects ink through the ejection port. The heater element is bonded to the nozzle plate with a low thermal product layer. The thermal product thermal product is less than 1495 Jm?2K?1s?1/2, the thermal product being (?Ck)1/2, where ? is the density of the layer, C is specific heat of the layer and k is thermal conductivity of the layer.

Abstract: A substrate heating system for an inkjet printhead. The substrate heating system includes heating resistors distributed in association with the ink jet nozzle structures, and located thermally adjacent thereto. The plural switching transistors that control the current through the substrate heating resistors are also distributed with the ink jetting nozzle structures, together with the substrate heating resistors. Polysilicon is used in constructing the substrate heating resistors. Cells of the substrate heaters can be arranged physically in a linear manner, along the nozzle structures. The substrate heater cells can be controlled so that the temperature of various zones of nozzle structures can be controlled.

Abstract: A heater stack includes first strata configured to support and 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.

Abstract: A nozzle arrangement is provided for ejecting ink. The nozzle arrangement includes a substrate assembly defining an ink inlet passage. A nozzle chamber structure extends from the substrate assembly to define a nozzle chamber in fluid communication with the ink inlet passage. The nozzle chamber structure defines an aperture through which ink in the nozzle chamber can be ejected. A pair of parallel heater elements extends from the nozzle chamber structure and into the nozzle chamber, and can be supplied with current so that ink in the nozzle chamber is ejected out through the aperture. Each heater element is shaped to define at least one broken annulus, in turn, comprising said at least one arcuate portion.

Abstract: An inkjet printhead that has a plurality of nozzles and a bubble forming chamber corresponding to each nozzle. The bubble forming chamber of each nozzle has at least one side wall and at least one heater element suspended within each of the bubble forming chambers respectively. Each heater element is configured to heat a bubble forming liquid in the printhead to a temperature above its boiling point to form a gas bubble therein. The generation of the bubble causes the ejection of a drop of an ejectable liquid (such as ink) through an ejection aperture in each nozzle, to effect printing. The heater element is spaced from the side wall of the bubble forming chamber by between 0.1 microns and 20 microns. The nucleation and growth of a gas bubble causes the pressure pulse that ejects ink from the nozzle aperture. By laterally enclosing the bubble with at least one of the side walls of the chamber, most of the pressure is dissipated by ejecting ink through the nozzle.

Abstract: A unit cell for a thermal inkjet printhead includes a substrate portion that defines an ink supply passage, Drive circuitry and interconnect layers are positioned on the substrate portion. A nozzle plate defining a nozzle is provided. Side walls depend from the nozzle plate and are positioned on the substrate portion to define an ink chamber. A heater element is connected to the drive circuitry and is positioned intermediate the nozzle plate and the substrate portion. The heater element is suspended in the ink chamber in alignment with the nozzle and is shaped to be symmetrical about two planes that intersect along an axis extending through a center of the nozzle.

Abstract: An inkjet printhead comprising: an array of ink chambers, each having a nozzle, an elongate actuator for ejecting ink through the nozzle; wherein, the nozzle has an elongate shape with its long dimension aligned with that of the elongate actuator.

Abstract: A method of ejecting drops of an ejectable liquid from a printhead is provided. The printhead has nozzles, a bubble forming chambers and heater elements. Each heater element is an elongate strip suspended between corresponding electrodes on opposite sides of the chambers and having a cross-section with a lateral dimension different than that of each other strip of the corresponding chamber and at least triple the thickness of that strip. The thickness of each strip is less than 0.3 microns. The heater elements and associated electrodes are arranged so that the electrodes are non-coincident with the electrodes of the other heater elements. The method includes heating the heater elements above the boiling point of the bubble forming liquid to form a gas bubble that causes ejection of a drop of an ejectable liquid from the nozzle, and supplying a volume of the ejectable liquid equivalent to the ejected drop.

Abstract: An inkjet printer comprises an array of nozzles extending substantially a width of a print media fed through the inkjet printer; and a plurality of heater elements each corresponding to a nozzle, the heater elements being formed substantially of titanium nitride. The heater elements are provided in contact with a bubble forming liquid and sized to heat the bubble forming liquid above a boiling point thereof upon application of 200 nJ or less of energy to each heater element.

Abstract: The present invention is directed to a heating resistor including a conducting oxide having an electric conductivity and a nonconducting oxide having insulation or nonconductivity, liquid ejecting heads and apparatus comprising the heating resistors.

Abstract: A heat transfer type ink-jet print head and a method of fabricating the same. A method of fabricating an ink-jet print head includes sequentially laminating a heat generation layer and an electrode layer on a substrate, laminating a protective layer on the top surfaces of the electrode layer and the heat generation layer by sequentially laminating a first protective layer and a second protective layer on the top surfaces of the electrode layer and the heat generation layer, and laminating an ink chamber barrier and a nozzle plate on the top surface of the protective layer to form an ink chamber to prevent defects such as “pin-holes” from being generated during the formation of the first protective layer.

Abstract: Provided is a pagewidth printhead having a plurality of micro-electromechanical nozzle arrangements. Each nozzle arrangement includes side walls located on a wafer substrate with a roof portion attached to said walls to define a printing fluid chamber. The roof portion defines an ejection port. Each nozzle arrangement also includes an inlet defined in the substrate to supply the fluid chamber with printing fluid, and at least one heater element having a mass of less than 10 nanograms suspended between the side walls in the fluid chamber. In operation, when electrical actuation energy of less than 500 nanojoules is applied to the heater element, the printing fluid undergoes thermal cavitation which increases fluid pressure in the chamber thereby ejecting printing fluid from the ejection port.

Abstract: An inkjet print head is provided having a nozzle areal density of at least 40000 inkjet nozzles per square centimeter on a printing surface. Each nozzle has an ink chamber on the printing surface having an ink ejection port, and a heater for heating the ink in the chamber to cause ink ejection from the ink ejection port.

Abstract: A MEMS vapor bubble generator includes a chamber for holding liquid; and a heater positioned in the chamber, the heater being formed using a sputtering technique. The heater is formed from a superalloy material. The superalloy material of the heater is in direct contact with the liquid, without any intervening protective coating. The superalloy has a crystalline structure with a grain size less than 100 nano-metres. The superalloy is MCrAlX, where M is one or more of Ni, Co, Fe with M contributing at least 50% by weight, Cr contributing between 8% and 35% by weight, Al contributing more than zero but less than 8% by weight, and X contributing less than 25% by weight, with X consisting of zero or more other elements, preferably including but not limited to Mo, Re, Ru, Ti, Ta, V, W, Nb, Zr, B, C, Si, Y, Hf.

Abstract: An ink jet printhead that has a plurality of nozzles, a bubble forming chamber corresponding to each of the nozzles respectively, the bubble forming chambers adapted to contain a bubble forming liquid; and at least one looped heater element disposed in each of the bubble forming chambers respectively, the heater elements configured for thermal contact with the bubble forming liquid; wherein heating of the looped heater element to a temperature above the boiling point of the bubble forming liquid forms a gas bubble that causes the ejection of a drop of an ejectable liquid through the nozzle corresponding to that heater element.

Abstract: A heater to control an ink bubble, and an inkjet printhead having the heater. The heater has different resistances according to portions thereof.

Abstract: A printhead integrated circuit comprising a substrate having a plurality of nozzle assemblies. A nozzle plate has a plurality of nozzles openings defined therein and each nozzle opening corresponds to a respective nozzle assembly. Each nozzle assembly havs a respective nozzle chamber and a heater element positioned in the nozzle chamber. Each heater element is suspended in the nozzle chamber and parallel with a plane of the nozzle plate. The integrated circuit includes drive circuitry for controlling actuation of the heater elements. Each heater element includes solid material having a thickness of at least 0.25 microns and a mass of less than 10 nanograms.

Abstract: An inkjet printhead nozzle arrangement includes side walls provided on a wafer substrate and a roof layer deposited on said side walls to define an ink chamber, the roof layer defining a nozzle aperture; an inlet defined in the substrate to supply the ink chamber with printing fluid; and at least one heater element having two opposite sides parallel to a plane of the ejection aperture, the heater element adapted to generate a gas bubble at both of said opposite sides. The heater elements and associated electrodes are arranged in the chamber to be non-coincident and have an annular shape facilitating a point of collapse of the bubble near a centre thereof The heater element has a mass of less than 10 nanograms.

Abstract: A printhead is provided having a substrate with a plurality of ejection nozzles a plurality of adjacently arranged structures laminated with the substrate. Each nozzle has an inlet for supplying ejection fluid to the nozzle. The structures have a plurality of passages distributing the ejection fluid to the inlets of the nozzles. Each structure has elongate apertures to the passages. The long dimension of the elongate apertures in the abutting sides of adjacent structures are angled relative to each other.

Abstract: An inkjet printhead that has a nozzle layer defining an array of nozzle apertures and a substrate for supporting the nozzle layer, the substrate defining a flow path for an ejectable liquid to each nozzle. Each nozzle aperture has an associated heater element positioned for heating the ejectable liquid above its boiling point to form a vapor bubble to eject a drop of the ejectable liquid through the nozzle aperture. The nozzle aperture is less than 5 microns thick in the drop ejection direction.

Abstract: A printer system is provided having a printhead which has nozzles, a bubble forming chamber corresponding to each nozzle, and heater elements disposed in each chamber each configured for thermal contact with a bubble forming liquid such that heating heater elements to a temperature above the boiling point of the bubble forming liquid forms a gas bubble that causes the ejection of a drop of an ejectable liquid through the nozzles. Each heater element is an elongate strip suspended between corresponding electrodes on opposite sides of the chamber. Each strip has a cross-section with a lateral dimension different than that of each other strip of the corresponding chamber and at least triple that of the thickness of that strip. The thickness of each strip is less than 0.3 microns. The heater elements and electrodes are arranged so that the electrodes are non-coincident with the electrodes of the other heater elements.

Abstract: There is disclosed an ink jet printhead which includes a plurality of nozzles 3 and one or more heater elements 10 corresponding to each nozzle 3. Each heater element 10 is configured to heat a bubble forming liquid 11 in the printhead to a temperature above its boiling point to form a gas bubble 12 therein. 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 heater is formed by layers of heater material, the number of layers forming the electrodes 15 exceeds the number of layers forming the heater element 10. By depositing more layers of heater material at the electrodes 15, the electrode resistance is reduced. With less resistance, there are less power losses from the electrodes 15 and overall efficiency of the printhead is improved. With the electrodes dissipating less heat to the wafer substrate, the printhead requires less cooling.

Abstract: A liquid ejecting apparatus includes an element substrate having thereon a plurality of heaters for generating energy for ejecting liquid; a plurality of liquid chambers provided on the element substrate and having ejection outlets for ejecting the liquid, wherein a plurality of the heaters are disposed in each of the liquid chambers, and wherein one part of the heaters and the other part of the heaters are switchably operable; and a switching unit for switching between a mode in which the one part of the heaters is actuated as main heaters, and the other part of the heaters stands by as stand-by heaters, and a mode in which the other part of the heaters is actuated as main heaters, and the one part of heaters stands by as stand-by heaters. A center of gravity of the one part of heaters and a center of gravity of the other part of heaters are aligned with each other in a plane of the element substrate, and surfaces of the heaters are protected by an anti-cavitation film comprising metal.

Abstract: A unit cell of a printhead is provided having a multi-layer substrate defining an ink inlet, one or more side walls extending from the substrate around the ink inlet, a nozzle plate supported by the side walls to define a chamber in fluid communication with the ink inlet, where the nozzle plate defines an aperture through which ink in the chamber can be ejected, and a looped and elongate heater element suspended within the chamber, which can be heated so that bubbles are generated in ink within the chamber and ink is ejected from the aperture. The elongate heater element terminates in a peripheral well in which the side walls are received.

Abstract: A pagewidth printhead has a controller. The printhead also has a plurality of micro-electromechanical nozzle arrangements controlled by the controller. Each nozzle arrangement includes side walls located on a wafer substrate with a roof portion attached to said walls to define a printing fluid chamber, the roof portion defining an ejection port. Each arrangement also includes an inlet defined in the substrate to supply the fluid chamber with printing fluid, and a plurality of heater elements suspended between the side walls in the fluid chamber, so that when electrical actuation energy is applied to respective heater elements a vapor bubble is formed in the fluid leading to a pressure increase in the chamber thereby ejecting the fluid via the ejection port. The controller is configured to actuate respective heater elements individually to facilitate weighted ink drop volumes to be ejected from the nozzle arrangement.

Abstract: An inkjet printhead that has a pair of electrodes, a heater having contacts abutting the pair of electrodes, a heater element for generating a vapour bubble in a quantity of ink and sloped side portions extending between the heater element and the contacts and, a nozzle spaced from the heater such that ink is ejected through the nozzle in response to the generation of a vapour bubble. The heater element has higher electrical resistance than the contacts and the sloped side portions.