A highly reliable multilayer structure element substrate according to an embodiment of this present invention comprises: an electrothermal transducer; a temperature detection element formed at a position where the temperature detection element at least partially overlaps the electrothermal transducer in a planar view of the element substrate; and a plurality of wirings connected to the temperature detection element, wherein the temperature detection element can detect temperatures in a plurality of regions when a plurality of different wirings out of the plurality of wirings are selected.

A liquid ejection head includes a print element substrate having an ejection port surface in which a plurality of ejection ports are arranged and a temperature control unit that controls a temperature of the ejection port surface. The print element substrate ejects a liquid from the plurality of ejection ports onto a medium moved by the liquid ejection head relatively to the liquid ejection head. The ejection port surface includes a region on a downstream side of the ejection port surface in a direction in which the medium relatively moves when the medium is viewed from the liquid ejection head, and includes a region on an upstream side of the ejection port surface in the relative moving direction. The temperature control unit control the temperature of the ejection port surface so that a temperature of the downstream side region becomes higher than a temperature of the upstream side region.

An example provides a fluid ejection apparatus including a fluid feed slot to supply a fluid to a plurality of drop ejectors, a first rib at a first side of the fluid feed slot and supporting drop ejection circuitry to control ejection of drops of the fluid from the plurality of drop ejectors, and a second rib at a second side, opposite the first side, of the fluid feed slot supporting a thermal sensor to facilitate determination of a temperature of the first rib and the second rib.

An inkjet printhead including a plurality of printhead dies, each printhead die including at least one crack sense resistor, at least one analog bus connected to each printhead die, and a controller separate from the plurality of printhead dies. The controller is configured to provide a known current to the at least one crack sense resistor of each printhead die in a selectable pattern via the at least one analog bus and to determine whether the printhead dies are cracked based on resulting voltages produced on the at least one analog bus.

In an example, a device for sensing a property of a fluid may include an ion-sensitive field effect transistor (ISFET) having a gate, a source, and a drain. The device may also include a first metal element in contact with the gate and a switching layer in contact with the first metal layer. A resistance state of the switching layer is to be modified through application of an electrical field of at least a predefined strength through the switching layer and is to be retained in the switching layer following removal of the electrical field. The device may also include a metal plate in contact with the switching layer, in which the metal plate is to directly contact the fluid for which the property is to be sensed.

In example implementations, an apparatus is provided. The apparatus includes a channel, an opening in the channel, and a heating element aligned with the opening on opposite sides of the channel. The channel contains a droplet of a first liquid containing a particle, wherein the droplet is carried within a second liquid in the channel. The heating element is to heat the first liquid to generate a vapor in the first liquid to eject the droplet of the first liquid through the opening.

An inkjet printer includes solvent vapor generators that direct two flows of solvent vapor on each side of each printhead in the process direction toward media passing the printheads in the printer. The solvent vapor attenuates the evaporation of ink solvent from ink drops on the nozzle plates or from the ink in the nozzles of the printheads. Thus, the ink on the nozzle plates and in the nozzles does not dry out and the operational status of the inkjets is preserved.

One example provides a fluidic die including a nozzle layer disposed on a substrate, the nozzle layer having an upper surface opposite the substrate and including a plurality of nozzles formed therein, each nozzle including a fluid chamber and a nozzle orifice extending through the nozzle layer from the upper surface to the fluid chamber. A conductive trace is exposed to the upper surface of the nozzle layer and extends proximate to a portion of the nozzle orifices, an impedance of the conductive trace indicative of a surface condition of the upper surface of the nozzle layer.

An integrated fluid ejection and imaging system may include a fluid ejector to eject a droplet of fluid onto a deposition site on a target, an imager to image the deposition site and a packaging supporting the fluid ejector and imager such that the fluid ejector and the imager are concurrently aimed at the deposition site on the target.

In one example in accordance with the present disclosure, a fluid ejection die is described. The fluid ejection die includes a fluid feed slot to deliver fluid from a reservoir to an array of ejection chambers fluid connected to the fluid feed slot. Each ejection chamber includes at least one fluid actuator and an opening through which fluid is to be ejected. The fluid ejection die also includes a number of antechambers. An antechamber includes sidewalls that curve inward.