Abstract: A manner of permanent alteration of an ink jet print head (10) for correction of misdirection of emitted or ejected ink drops. The ink jet print head (10) has a surface (14) defining at least one orifice or nozzle (16) therethrough for emitting or ejecting ink droplets from an ink source onto a printing or recording medium and at least one element (28,30,34,44,48,50) disposed around the orifice or nozzle (16) and selectably removable for altering a directional path of the ejected or emitted ink droplets, correction of misdirection of emitted or ejected ink droplets from the at least one orifice or nozzle (16) involving asymmetrically removing a portion of the element (28,30,34,44,48,50) disposed around the orifice or nozzle (16).

Abstract: An ink jet printing device having at least one nozzle connected to an ink supply and having a buckle plate able to be deformed so as to eject ink on demand from the nozzle is disclosed. The buckle plate is constructed from a first material such as polytetrafluoroethylene having a high coefficient of thermal expansion. The plate is heated by an integral heater means constructed from a second electrically resistive material such as copper. The heater is constructed in a serpentine manner so as to allow the expansion of the length of the heater means substantially in accordance with the expansion of the first material. The energy of activation of the buckle plate for the ejection of a drop of ink is less than about 20 microjoules.

Abstract: The individual monochromatic printheads mounted simultaneously on the scanning carriage of an ink jet printer are provided with an opto-electronic position detector of the four-quadrant type, which is integrated directly in the chip of each head by means of the same MOS technology used for the circuits for selection and driving of the emission resistors; an illumination device fixed onto the printer focuses a light spot on the position detector which thus provides the electronic control unit of the printer with a measurement of both the vertical and horizontal misalignment of each head, a measurement which is subsequently used in order to compensate automatically for the misalignment thereof.

Abstract: In a thermal ink jet printhead, an emission resistor includes a layer of electrically conductive material for making connections to the resistor. A temperature sensor and a reference temperature sensor, provided for detecting the temperature of enucleation of a bubble and used to directly determine the amount of energy needed for the emission resistor to effectively reach the temperature of enucleation, are arranged in correspondence with an integrated test resistor identical in construction to the emission resistor. The temperature sensor is formed from the layer of electrically conductive material. A differential amplifier having inputs connected to the temperature sensor and the reference temperature sensor effects regulation of a variable duration of pulses applied to the emission resistor.

Abstract: Any air trapped in a connection portion between adjacent ones of flow passage plates of an ink jet recording head in manufacturing the head.

Abstract: A droplet generator is provided that is particularly adapted for generating micro droplets of ink on demand in an inkjet print head having a plurality of nozzles. The droplet generator includes a droplet separator formed from the combination of a droplet assistor and a droplet initiator. The droplet assistor is coupled to ink in each of the nozzles and functions to lower the amount of energy necessary for an ink droplet to form and separate from an ink meniscus extending across the nozzle outlet. The droplet assistor may be, for example, a heater or surfactant supply mechanism for lowering the surface tension of the ink meniscus. Alternatively, the droplet assistor may be a mechanical oscillator such as a piezoelectric transducer that generates oscillations in the ink sufficient to periodically form convex ink menisci across the nozzle outlets, but insufficient to cause ink droplets to separate from the outlets.

Abstract: A liquid discharging method for discharging liquid, which uses the pressure exerted at the time of creating each of bubbles in liquid in a bubble generating area, is arranged to provide two bubble generating areas for generating bubbles in such a manner as to enable these areas to face each other at least partly, hence discharging liquid by means for the pressure thus exerted in the bubble generating areas. In this way, it becomes possible to increase the amount of liquid discharged, as well as to enhance the durability of the movable members, while stabilizing the discharge of liquid from each of the discharge openings.

Abstract: It is an exemplified object of the present invention to provide an inkjet head, its manufacturing method, and a recording device that can form a high-quality image while preventing an ink leakage. To accomplish the object, an indent is provided at a joint surface of a pressure chamber plate with an adhesive.

Abstract: A technique for improving lamination quality and for controlling NCA in an ink-jet printhead. With respect to lamination quality, printhead regions are identified where it is desirable to improve planarity or to reduce the likelihood of corner lift or barrier/orifice plate delamination. Planarization is accomplished by the insertion of a suitably configured composition of gold, metal-2 or metal-3 into an identified region in the thin film substrate, thereby eliminating substantially delamination between ink barrier layer and substrate. Substantial NCA control is achieved when a similarly configured composition is inserted into the thin film substrate to achieve planarization in the printhead region near the ink drop generators.

Abstract: The invention provides inkjet print heads, which have one or more components of a polymer material, which is produced, substantially, or with the use of, at least one Compound (I) XaRbSiR1(4−a−b) with X=hydrolyzable group, R=eventually substituted Alkyl, Aryl, Alkenyl, Alkylaryl or Arylalkyl, R1=organic remainder with at least one polymerizable group, a= to 3, b=0 to 2. In addition, the invention provides a process for the manufacture of the heads and for the utilization, for said purpose, of a polymer material.

Abstract: Pillars are formed in a fully integrated thermal inkjet printhead to prevent particles from entering into a nozzle chamber along an ink refill channel. The pillars are formed after a step of applying a thin film structure to a substrate. At one step, pits are etched through the thin film structure. At another step, material for an orifice layer is deposited into the pits. At another step, a firing chamber is etched into the orifice layer. At another step, a trench is etched into the backside of the wafer in the vicinity of the filled pits. The material filling each pit is not removed and remains in place to define the respective pillars. Two or more pillars are formed within the trench for each inkjet nozzle chamber. Alternatively pillars are formed by depositing material into the underside trench and performing photoimaging processes.

Abstract: A liquid discharge method is disclosed which comprises a displacement step where a movable member is displaced by generating an electrostatic force between a substrate having a thermal energy generating element for generating thermal energy which is utilized to discharge a liquid through a discharge port and the movable member disposed opposite to the thermal energy generating element and having a free end on a downstream side in the flow direction of the liquid to thereby displace a liquid surface at the discharge port to an upstream side in the flow direction of the liquid; and a discharge step where the movable member is displaced owing to a bubble formed by the thermal energy generated by the thermal energy generating element to discharge the liquid through the discharge port. In addition, there are also herein disclosed a liquid discharge head, a manufacturing method of the head, a head cartridge, a liquid discharge device, and the like.

Abstract: This specification discloses an electrode type print head for the printing apparatus and the method for manufacturing the same. The print head is placed in the inkjet cartridge of an inkjet-printing device. The print head comprises a substrate and a flexible nozzle plate with an ink reservoir formed in between. The flexible nozzle plate is attached onto the substrate, and the electrode set of the flexible nozzle plate corresponds to that of the substrate. When currents of different polarities are provided thereon, an absorptive force is generated to pull the flexible nozzle plate closer to the substrate. A pushing force jets the ink out of the print head and onto a printing media to achieve the goal of inkjet printing.

Abstract: A nozzle plate apparatus for an inkjet printer has a nozzle aperture (8) which includes a plurality of elements (9) sub-dividing the aperture into a plurality of smaller apertures.

Abstract: The invention provides a flow feature structure for an ink jet printer. The structure includes a polymeric nozzle plate having a nozzle plate thickness, the nozzle plate containing a plurality of ink chambers, each ink chamber containing a nozzle hole in fluid communication therewith, a plurality of ink channels each having a channel width and an ink channel inlet for providing ink flow from an ink supply region to one each of the ink chambers and an air bubble interrupter device having a width dimension perpendicular to a flow axis through the ink channel. The width dimension of the air bubble interrupter is from about 0.5 to about 1.2 times the ink channel width and the interrupter device is disposed adjacent each of the ink channels and spaced from the ink channel inlet a distance of from about 0.5 to about 1.2 times the ink channel width.

Abstract: The invention provides inkjet print head which has an Anti-wetting Coating of a polymer material, which is produced with the utilization of at least one Compound (I) XaRbSiR1(4-a-b) with X=hydrolyzable group, R=possibly substituted Alkyl, Aryl, Alkenyl, Alkylaryl or Arylalkyl, R1=organic remainder with at least one polymerizable group, a=to 3, b=0 to 2. In addition, a Process for the Manufacture of the Print Heads is made available, as well as a Means for the Coating of same.

Abstract: In order to enable high speed printing with maintaining reliability of ink ejection, an auxiliary hole is provided in an upper wall forming a liquid passage. An opening area of the auxiliary hole is set to be greater than or equal to three times of an opening area of an ejection opening, and a minimum distance between the auxiliary hole and the ejection opening is set to be greater than or equal to three times of a height of the liquid passage.

Abstract: A droplet generator is provided that is particularly adapted for generating micro droplets of ink on demand in an inkjet printhead having a plurality of nozzles. The droplet generator includes a droplet separator formed from the combination of a droplet assistor and a droplet initiator. The droplet assistor is coupled to ink in each of the nozzles and functions to lower the amount of energy necessary for an ink droplet to form and separate from an ink meniscus extending across the nozzle outlet. The droplet assistor may be, for example, a heater or surfactant supply mechanism for lowering the surface tension of the ink meniscus. Alternatively, the droplet assistor may be a mechanical oscillator such as a piezoelectric transducer that generates oscillations in the ink sufficient to periodically form convex ink menisci across the nozzle outlets, but insufficient to cause ink droplets to separate from the outlets.

Abstract: A liquid discharge head is provided which allows production of a recorded image of improved quality by controlling the speed of flow of a liquid and the distribution of the speed of flow in a flow path caused in consequence of contraction of bubbles thereby stabilizing the direction of satellites arising behind main drops of discharged liquid and, at the same time, decreasing the amount itself of the satellites.

Abstract: A micro-injecting device and a method for manufacturing the device are disclosed in which a main operational part of a membrane is structured to have two regions: an impact film region having high expansion and contraction delivery characteristics, for example, a nickel film region, and an organic film region having high expansion and contraction, for example, a polyimide film region. Each of the two regions serves as an impact delivery medium for efficiently pushing ink upward, a prompt initialization medium, and a hinge for dispersing and eliminating a stress, to thereby prevent deformation, for example, wrinkling, of the a membrane. In addition, a membrane having such enhanced main operation part can endure stress and react well during operation. As a result, significantly enhanced injecting performance can be obtained.

Abstract: An ink jet printhead having first and second arrays of ink drop generators adjacent edges of a printhead substrate, third and fourth arrays of ink drop generators inboard of the first and second ink drop generator arrays, a first ink feed slot adjacent the first ink drop generator array which receives ink only from the first ink feed slot, a second ink feed slot adjacent the second ink drop generator array which receives ink only from the second ink feed slot, and a third ink feed slot between the third and fourth ink drop generator arrays which receive ink from the third ink feed slot. Circuit regions are provided in the printhead substrate between the first ink feed slot and the third ink drop generator array, and between the second ink feed slot and the fourth ink drop generator array.

Abstract: This invention provides, in a novel liquid discharge method utilizing a movable member, a configuration for detecting presence or absence of liquid in the liquid path or discharge state of the liquid. In an embodiment of this invention, the element substrate of the liquid discharge head is rendered electrically conductive and a partition wall for separating a liquid path for the liquid to be discharged and a liquid path for generating energy for liquid discharge upon heating is also rendered electrically conductive, and a detecting pulse is applied to the partition wall to detect the difference in potential or the variation in electrostatic capacitance between the element substrate and the partition wall, whereby the presence or absence of liquid in the small liquid path is detected.

Abstract: A silicon ink filter for a heater chip of an ink jet printhead is formed by micromachining and laser drilling. The heater chip may contain a plurality of such filters for the plurality of nozzles of the printhead. The filter comprises a via constituting an ink entrance area formed by micromachining and a plurality of bores formed at the exit side of the via produced by laser drilling. Protective layers are preferably disposed over the heater chip substrate prior to micromachining and laser drilling.

Abstract: This invention has as its object to provide a substrate for an ink jet recording head, which is compact and can realize stable recording with high reliability, a recording head using the substrate, a recording apparatus mounting the recording head, and a method of driving the recording head. There are disclosed a substrate for a thermal recording head, having a plurality of heating resistor elements, a plurality of wiring electrodes for supplying driving signals to the heating resistor elements, a function element, electrically connected to the heating resistor elements, for selectively driving the plurality of heating resistor elements, and a measurement resistor element which is electrically independent form the heating resistor elements and the function element, and haws a resistance value larger than that of each heating resistor element, an ink jet head, a head cartridge, and a recording apparatus utilizing the substrate, and a method of driving a recording head using a measurement resistor.

Abstract: The present invention involves recording apparatus having such a recording head that records using thermal energy. The recording head has a substrate which includes plural thermal energy generating elements for generating thermal energy, plural wiring lines electrically connected with associated said thermal energy generating elements, and a temperature detecting element built in the substrate. This temperature detecting element is either a diode or a transistor.

Abstract: An inkjet printing device employs an inkjet printhead with a plurality of drop generators to eject drops of ink. Each drop generator includes a planar heater resistor, a protection layer having a first heating surface on the heater resistor and a second heating surface entirely surrounding the first heater surface on the heater resistor, and an ink ejection nozzle. The drop generator vaporizes ink at the first heating surface and ejects a drop of ink of a first mass from the nozzle when a first range of energies is applied to the heater resistor. The drop generator vaporizes ink at the first heating surface and the second heating surface and ejects a drop of ink of a second mass from the nozzle when a second range of energies is applied to the heater resistor.

Abstract: A device for storing and supplying an active liquid in an ink jet printhead including: an ink injector for jetting ink stored in an ink storage tank; and an active liquid storage tank mounted in close contact with one side of the bottom of the ink storage tank, storing an active liquid to be supplied to the ink injector, the ink injector having a single fluid path formed therein so as for the active liquid to be circulated and returned to the active liquid storage tank, the device having such a fluid path as to supply the active liquid between the heating chambers in the ink injector, cooling the heating chambers rapidly with the high speed of printing, and making it possible to check the completion of injection of the active liquid through feeding and circulating apertures.

Abstract: A liquid jet head is provided with a first bubble generating device for enabling a first flow path conductively connected with a first discharge opening to create a bubble for the formation of discharge droplet, and a second bubble generating device for enabling a second flow path conductively connected with a second discharge opening to create a bubble for the formation of discharge droplet, and comprises a substrate having the first and second bubble generating devices on the surface area shared by them for use, an orifice section provided with the first and second discharge openings sequentially in the direction intersecting the sharable surface area of the substrate, and a flow path formation section for separating each path of the first and second flow paths at least from the discharge opening to the bubble generating device thereof, at the same time, arranging at least part of the first and second flow paths to be essentially in the form of laminated layer with respect to the substrate.

Abstract: An ink jet recording head is provided at least with ink discharge pressure generating elements, nozzles for discharging ink liquid droplets, and a through opening formed by means of Si anisotropic etching for the ink supply on the Si substrate having <100 > plane orientation. Then, the oxygen concentration of the Si substrate having the <100> plane orientation is arranged to be 1.3E18 (atoms/cm.sup.3) or less. With the substrate thus arranged, it becomes possible to enhance the production yield when forming the ink supply ports by means of the Si anisotropic etching, and at the same time, it is possible to reduce the variation of the widths of the ink supply ports that may be caused by the Si anisotropic etching. Thus, the ink discharge frequency is enhanced.

Abstract: An ink jet head having a buffer chamber which absorbs any back-pressure wave generated as a result of generation of back wave, thereby preventing reduction of refilling with ink. Exothermic elements provided in buffer chambers formed in a common ink chamber generate bubbles so that bubbles are always maintained in the buffer chambers so as to ensure stable recording.

Abstract: Disclosed are a recording apparatus capable of forming such a meniscus of a dye as to allow the dye to be supplied to a dye flying portion without interruption and to be held in the dye flying portion in an amount necessary for flying of the dye, and a method of manufacturing the recording apparatus without complicating the manufacturing steps as compared with those of the related art manufacturing method.

Abstract: A liquid ejecting head cartridge includes a liquid ejection head, the liquid ejection head including; a first liquid flow path in fluid communication with an ejection outlet; bubble generation region; second liquid flow path distributed adjacent the first liquid flow path; a movable member disposed faced to the bubble generating region and displaceable between a first position and a second position more remote from the bubble generating region than the first position; wherein the first and second liquid flow paths are capable of being supplied with different first 1 and second liquids, respectively; wherein the movable member is displaced from the first position to the second position by pressure produced by the generation of the bubble in the bubble generating portion to direct the pressure toward the ejection outlet, thus ejecting the liquid through the ejection outlet; and the cartridge further comprising: a liquid container device for supplying the liquid to the liquid ejection cartridge, wherein the liqu

Abstract: A printhead for ejecting fluid has a nozzle on a first surface and a fluid feed channel defined within a second surface. The printhead includes an aggregate of thin-film layers, a portion of which is exposed by the fluid feed channel. The aggregate of thin-film layers contains at least one energy dissipation element suspended over the fluid feed channel. A heat spreader is mesially interposed within the aggregate of thin-film layers. The heat spreader proximally abuts to the energy dissipation element and extends from the energy dissipation element to extend past the fluid feed channel definition. The heat spreader is capable of dissipating heat from the energy dissipation element to a portion of the first surface of the printhead.

Abstract: A recording head for recording on a recording medium, comprises a recording element substrate provided with a plurality of recording elements for recording on the recording medium based on a signal, and a plurality of wiring electrodes electrically connecting to the recording elements respectively, and a driving element substrate provided with a plurality of driving elements for selectively driving the recording elements, and connecting wiring electrodes for sending the signal output from the each driving element to the wiring electrodes on the recording element substrate, upon being connected to wirings of the recording element substrate, wherein the positioning between the recording element substrate and the driving element substrate is made by abutting the recording element substrate against the end face of the driving elements.

Abstract: A crack or delamination occurring within a thin film structure of a printhead is limited to a local region by strategically locating openings within the thin film structure. The etched openings serve to partially isolate each nozzle chamber. The openings are etched in passivation and other layers of the thin film to limit the propagation of the crack or delamination. As thermal stresses re-occur the crack or delamination extends. In may cases the crack or delamination eventually extends to the etched opening. The crack or delamination then ceases its propagation, in effect being blocked by the etched opening. By including an etched opening within the thin film near each nozzle chamber, a given nozzle chamber is isolated from a crack or delamination in the thin film at an adjacent or nearby nozzle. Reliability of a given nozzle therefore is less dependent upon the reliability of an adjacent nozzle.

Abstract: A method of reducing the `downtime` of the printing line involves the inclusion of at least one spare printing module, and a method of transferring digital representations of page images between modules. As soon as a fault is detected, a digital image data describing the sheet printed by the faulty module is transferred to the adjacent printing module downstream from the faulty module. The data in this module is simultaneously sent to the module downstream of it. This process repeats until a page image is sent to the spare printing module, which is best located as the most downstream of all the printing modules. Once all of the data has been transferred, printing can recommence. If this data transfer can occur in less than the time required to print a sheet, the line can continue printing without stopping, and without any wastage of printed copies.

Abstract: The present invention provides an ink-jet head, an ink-jet cartridge and an ink-jet apparatus, which can provide certain and stable electrical connection in a separable manner between an energy generation element unit and a driving element unit. The ink-jet head includes the energy generation element unit U.sub.E having signal wires for supplying electric signals for heat generating resistors, and connecting electrodes projectingly provided at the ends of the signal wires positioned on the mating surface F.sub.E, and the driving element unit U.sub.D having signal wires for feeding electric signals from the driving elements for driving head generating resistors, and connecting electrodes projectingly provided at the ends of the signal wires positioned on the mating surface F.sub.D. The connecting electrodes are connected to each other by mutually mating the mating surfaces F.sub.E and F.sub.D of the energy generation element unit U.sub.E and the driving element unit U.sub.D.

Abstract: An ink jet recording apparatus for recording on a recording material with ink includes an ink jet recording head mounting portion, an ink jet recording head, a base plate, a feeder and a mounting device. The mounting portion is for mounting the recording head. The recording head has ejection outlets converged in a direction of ink ejection and inclined relative to the base plate. The feeder feeds the recording material. The mounting device is for mounting the ink jet recording head on the mounting portion so that the direction of ink ejection from the ink ejection outlets of the recording head is perpendicular to the recording material.

Abstract: This invention has as its object to provide a substrate for an ink jet recording head, which is compact and can realize stable recording with high reliability, a recording head using the substrate, a recording apparatus mounting the recording head, and a method of driving the recording head.There are disclosed a substrate for a thermal recording head, having a plurality of heating resistor elements, a plurality of wiring electrodes for supplying driving signals to the heating resistor elements, a function element, electrically connected to the heating resistor elements, for selectively driving the plurality of heating resistor elements, and a measurement resistor element which is electrically independent from the heating resistor elements and the function element, and has a resistance value larger than that of each heating resistor element, an ink jet head, a head cartridge, and a recording apparatus utilizing the substrate, and a method of driving a recording head using a measurement resistor.

Abstract: An ink jet recording apparatus comprises an ejection orifice for ejecting an ink, a supply portion, communicating with the ejection orifice, for supplying an ink stored therein to the ejection orifice, an ejection energy producer, arranged in the supply portion, for applying energy for ink ejection to the ink, a pressure producer, arranged in the supply portion at a position different from the ejection energy producer, for producing a pressure wave in the supply portion, and a controller for controlling the pressure producer to produce a pressure wave different from a pressure wave produced in the supply portion by the ejection energy producer.

Abstract: The invention is directed to an ink jet printhead assembly for jetting a supply of ink onto a print medium. A printhead includes a substrate and a plurality of heater elements mounted on the substrate. A nozzle plate is attached to the printhead. The nozzle plate and/or substrate includes an ink feed channel and a plurality of ink chambers. The nozzle plate includes a plurality of ink emitting orifices and a plurality of non-emitting orifices. Each ink emitting orifice is associated with a respective one of the ink chambers and is positioned adjacent to a respective one of the heater elements. Each ink chamber is in fluid communication with the ink feed channel at a first fluid port and in fluid communication with a respective one of the non-emitting orifices at a second fluid port.

Abstract: An ink jet recording apparatus performing recording by discharging ink from a recording head onto a recording medium. A conveying belt for conveys the recording medium by the attraction of static electricity, an electrode contacts the recording medium conveyed by the conveying belt, and a power source charges the electrode with a charge having a polarity opposite to a charge carried by the conveying belt. The recording head includes a discharge port and a control electrode formed around the discharge port. A voltage identical to the polarity of the surface potential of the recording medium is generated by a power source and applied to the control electrode to cause the control electrode to repel any satellite droplet of the polarity identical to the voltage that splits from a discharged ink droplet during the flight thereof.

Abstract: A valve device is incorporated within a printhead of an ink-jet pen for regulation of ink flow and pressure within the printhead. The valve device includes a valve member comprising a resiliently deformable flap positioned in an ink channel, adjacent a firing chamber. The flap is deflectable into and out of a position to regulate ink flow and pressure both to and from the ink firing chambers.

Abstract: Disclosed is a process which comprises reacting a polyimide precursor with borane. Also disclosed is a thermal ink jet printhead containing a layer comprising the product of this reaction.

Abstract: An ink jet head base body has arranged thereon a plurality of electricity-heat converters having a substrate, heat generating resistors provided on the substrate, and electrodes electrically connected to the heat generating resistors. The cutting line is provided between the plural electricity-heat converters, and the monitors for the quality confirmation are disposed on the cutting line.

Abstract: A micromachine comprises at least one heat generating unit arranged on the surface of a substrate, a housing for retaining liquid having a liquid retaining portion along the heat generating unit, and a rotator rotatively supported in the liquid retaining portion of the housing for retaining liquid. This rotator is structured to rotate by way of the boiling of liquid in the liquid retaining portion by heat generated by the heat generating unit. The micromachine, such a micropump or a micromotor, is incorporated in a liquid jet recording head to cause recording liquid to flow compulsorily in order to remove accumulated bubbles in the liquid paths for maintaining good performance of the liquid jet recording head at all times.

Abstract: A liquid droplet ejecting recording head includes a wall defining a chamber for being filled with recording liquid, said wall having a portion for defining an orifice communicated with the chamber; and a thin-film resistor provided on a surface of the wall facing the chamber so as to be located in the chamber, the thin-film resistor having one surface facing the chamber with which the thin-film resistor may be exposed to the recording liquid contained in the chamber, the thin-film resistor being energized with pulsed electric current for generating pulsed heat to directly heat the recording liquid, to thereby allow the recording liquid to be ejected outside through the orifice from the chamber in the form of a droplet and to be attached onto a surface of image recording medium positioned in confrontation with the orifice.

Abstract: A liquid ejecting recording head using thermal energy to eject liquid for recording an image, includes an element chip having a plurality of electrothermal transducer elements for producing thermal energy to create bubbles to ejecto the liquid; a temperature detecting element disposed on the element chip to detect a temperature of the chip; liquid passages, disposed on the chip, corresponding to the electrothermal transducer elements having an opening at an end; correcting means for correcting an output of the temperature detecting element.

Abstract: In the embodiments of the simplified ink jet head described in the specification, a carbon plate is formed with orifice passages extending through the plate, pressure chambers on one side of the plate, flow-through passages on the other side of the plate and ink supply passages, and a piezoelectric plate having a conductive coating on the exposed side is affixed to the pressure chamber side of the carbon plate by a thin layer of epoxy adhesive. The conductive coating on the piezoelectric plate is photo-etched to produce an electrode pattern corresponding to the pattern of the pressure chambers in the carbon plate, and an orifice plate is affixed by a thin layer of epoxy adhesive to the opposite surface of the carbon plate with orifices aligned with the orifice passages in the carbon plate.

Abstract: A thermal inkjet printhead includes unpassivated heater resistors whose resistive material is doped, preferably with oxygen, nitrogen or an equivalent dopant, for increasing the resistance of the material. By increasing the resistance of the resistive material through doping, the drive currents for generating heat within the resistors need not be changed from levels which inkjet printers are presently designed to work with. The printhead of the invention can thus be used in place of a standard printhead without modification to the printer.