摘要:
A micro-fluid ejection device structure and method therefor having improved low energy design. The devices includes a semiconductor substrate and an insulating layer deposited on the semiconductor substrate. A plurality of heater resistors are formed on the insulating layer from a resistive layer selected from the group consisting of TaAl, Ta2N, TaAl(O,N), TaAlSi, Ti(N,O), WSi(O,N), TaAlN, and TaAl/TaAlN. A sacrificial layer selected from an oxidizable metal and having a thickness ranging from about 500 to about 5000 Angstroms is deposited on the plurality of heater resistors. Electrodes are formed on the sacrificial layer from a first metal conductive layer to provide anode and cathode connections to the plurality of heater resistors. The sacrificial layer is oxidized in a plasma oxidation process to provide a fluid contact layer on the plurality of heater resistors.
摘要:
An ink jet printhead for an ink jet printer and method for making an improved printhead. The printhead includes a nozzle plate attached to a heater chip. The heater chip is a semiconductor substrate having a resistive layer deposited on the substrate, a dielectric layer deposited on the resistive layer, a cavitation layer for contact with ink, and an adhesion layer between the dielectric layer and cavitation layer. The adhesion layer is selected from the group consisting of tantalum nitride (TaN), tantalum oxide (TaO), silicon nitride (SiN), and titanium nitride (TiN), provided the adhesion layer and cavitation layer are selected so that the adhesion layer has no elemental component in common with the cavitation layer when the dielectric layer is comprised of SiC/SiN. Adhesion between the dielectric layer and cavitation layer is significantly enhanced by the invention.
摘要:
A semiconductor substrate for a micro-fluid ejection head. The substrate includes a plurality of fluid ejection actuators disposed on the substrate. Each of the fluid ejection actuators includes a thin heater stack comprising a thin film heater and one or more protective layers adjacent the heater. The thin film heater is made of a tantalum-aluminum-nitride thin film material having a nano-crystalline structure consisting essentially of AlN, TaN, and TaAl alloys, and has a sheet resistance ranging from about 30 to about 100 ohms per square. The thin film material contains 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.
摘要:
A micro-fluidic pump comprises one or more channels having an array of resistive heaters, an inlet, outlet and a substrate as a heat sink and a means of cooling the device. The pump is operated with a fire-to-fire delay and/or a cycle-to-cycle delay to control the pumping rate and minimize heating of liquid inside the pump during its operation.
摘要:
An aqueous composition for forming a micro-fluid jet printable dielectric film layer, methods for forming dielectric film layers, and dielectric film layers formed by the method. The aqueous composition includes from about 5 to about 20 percent by weight of a polymeric binder emulsion, from about 10 to about 30 percent by weight of a humectant, from about 0 to about 3 percent by weight of a surfactant, and an aqueous carrier fluid. The aqueous composition has a viscosity ranging from about 2 to about 6 centipoise at a temperature of about 23° C.
摘要:
A piezoelectric inkjet printhead is monolithically fabricated on a substrate. The printhead includes a plurality of cavities formed into the substrate, piezoelectric actuators disposed over the top of the cavities, a fluidic structure and an ink supply channel. The piezoelectric actuators are formed over the cavities using a sacrificial material which fills the cavities and is removed after the actuators are formed. The fluidic structure defines pressurizing chambers and channels connected to the ink supply channel. The fluidic structure has a plurality of nozzle holes formed on the top surface. The cavities are connected to either a venting channel formed from the backside of the substrate or a venting chamber formed inside the fluidic structures.
摘要:
A micro-fluidic pump comprises one or more channels having an array of resistive heaters, an inlet, outlet and a substrate as a heat sink and a means of cooling the device. The pump is operated with a fire-to-fire delay and/or a cycle-to-cycle delay to control the pumping rate and minimize heating of liquid inside the pump during its operation.
摘要:
A heater stack includes first strata configured to support and form a fluid heater element responsive to repetitive electrical activation and deactivation to produce cycles of fluid ejection and second strata overlying the first strata to protect the heater element. A decomposed sacrificial layer of a preselected polymer between the substrate and a heater substrata containing the heater element provides a decoupled relationship between them which, during a heat-up period of each cycle, results in the heater element buckling out of physical contact with substrate enabling the heater element to transfer heat energy for producing fluid ejection into the fluid without transferring any into the substrate whereas the decoupled relationship, during the next following cool-down period of each cycle, results in the heater element de-buckling back into physical contact with the substrate enabling the heater element transfer residual heat energy to the substrate.
摘要:
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.
摘要:
A heater stack includes first strata configured to support and form a fluid heater element responsive to repetitive electrical activation and deactivation to produce repetitive cycles of fluid ejection from an ejection chamber above the heater element and second strata overlying the first strata and contiguous with the ejection chamber to protect the heater element. The first strata includes a substrate with a cavity formed either in or above the substrate, a heater substrata overlying the cavity and substrate, and a decomposed layer of material between the substrate and heater substrata and processed to provide the cavity substantially empty of the layer of material such that the cavity provides a means which, during repetitive electrical activation, enables the heater element to transfer heat energy into the fluid in the ejection chamber for producing ejection of fluid therefrom substantially without transferring heat energy into the substrate.