A thermal bend actuator includes: a thermoelastic beam for connection to drive circuitry; and a passive beam mechanically cooperating with the thermoelastic beam, such that when a current is passed through the thermoelastic beam, the thermoelastic beam expands relative to the passive beam resulting in bending of the actuator. The thermoelastic beam wherein the thermoelastic beam is comprised of an aluminium alloy. The aluminium alloy comprises a first metal which is aluminium, a second metal, and at least 0.1 at. % of a third metal selected from the group consisting of: copper, scandium, tungsten, molybdenum, chromium, titanium, silicon and magnesium.

A method of printing, including providing a fluid ejection device that includes a substrate, a plurality of drive units formed on the substrate, each drive unit including at least two drive elements electrically coupled in parallel, and a plurality of fluid ejection elements disposed on the substrate, each fluid ejection element of the plurality of fluid ejection elements electrically coupled with a single respective drive unit. Electrical power is selectively supplied via the plurality of drive units to the plurality of fluid ejection elements to cause fluid to be expelled from the fluid ejection device based on image data.

A thermal bend actuator includes: a thermoelastic beam for connection to drive circuitry; and a passive beam mechanically cooperating with the thermoelastic beam, such that when a current is passed through the thermoelastic beam, the thermoelastic beam expands relative to the passive beam resulting in bending of the actuator. The thermoelastic beam wherein the thermoelastic beam is comprised of an aluminium alloy. The aluminium alloy comprises a first metal which is aluminium, a second metal, and at least 0.1 at. % of a third metal selected from the group consisting of: copper, scandium, tungsten, molybdenum, chromium, titanium, silicon and magnesium.

In one example in accordance with the present disclosure, a fluid ejection die is described. The die includes a number of actuator sensors disposed on the fluid ejection die to sense a characteristic of a corresponding actuator and to alter an evaluation voltage based on a performance of the corresponding actuator. The die also includes an actuator evaluation device per primitive to detect a failed actuator based at least in part on a comparison of the altered evaluation voltage and at least one threshold voltage. The die also includes a number of disable device coupled to respective actuators and to disable failed actuators.

A liquid ejection head includes a substrate including an energy generating element configured to generate energy used for ejecting a liquid, a flow channel member overlying the substrate and defining a flow channel through which a liquid is supplied, and an ejection opening member overlying the flow channel member and defining an ejection opening through which the liquid supplied through the flow channel is ejected by the energy from the energy generating element. The flow channel member contains a crosslinked cured product of a multifunctional epoxy resin and a polyhydric alcohol having a perfluoroalkyl group in the molecular structure, and the concentration of a component derived from the polyhydric alcohol in the flow channel member is lower on the side adjacent to the substrate than on the side adjacent to the ejection opening member.

A liquid ejection head includes a substrate including an energy generating element configured to generate energy used for ejecting a liquid, a flow channel member overlying the substrate and defining a flow channel through which a liquid is supplied, and an ejection opening member overlying the flow channel member and defining an ejection opening through which the liquid supplied through the flow channel is ejected by the energy from the energy generating element. The flow channel member contains a crosslinked cured product of a multifunctional epoxy resin and a polyhydric alcohol having a perfluoroalkyl group in the molecular structure, and the concentration of a component derived from the polyhydric alcohol in the flow channel member is lower on the side adjacent to the substrate than on the side adjacent to the ejection opening member.

In a molding step, at least a first member, which constitutes a liquid supply unit together with a second member, is injection molded by using an injection mold including first and second molds being made openable and closable. In a mold opening step, the first and second molds are opened while leaving the first member, which is injection molded in the molding step, on the first mold. In a first bonding step, a third member constituting the liquid supply unit is bonded to the first member left on the first mold.

A thermal inkjet printhead may include a passivation layer, a bond pad formed over the passivation layer and insulating strips of a dielectric material formed over the passivation layer on opposite sides of the bond pad.

A thermal inkjet printhead may include a passivation layer, a bond pad formed over the passivation layer and insulating strips of a dielectric material formed over the passivation layer on opposite sides of the bond pad.

A thermal inkjet printhead is described. The thermal inkjet printhead comprising a passivation layer and a plurality of bond pads formed over the passivation layer. The thermal inkjet printhead further comprises a plurality of insulating strips formed over the passivation layer. The insulating strips are formed such that two adjacent bond pads are separated by an insulating strip, from among the plurality of insulating strips. Further, each of the plurality of the insulating strips is of a dielectric material.