A liquid discharge head includes a flow passage member and a plurality of pressurizing sections. The flow passage member includes a plurality of discharge holes, a plurality of pressurizing chambers respectively connected to a plurality of the discharge holes, a plurality of first flow passages respectively connected to a plurality of the pressurizing chambers, a second flow passage commonly connected to a plurality of the first flow passages, a plurality of third flow passages respectively connected to a plurality of the pressurizing chambers, and a fourth flow passage commonly connected to a plurality of the third flow passages. A plurality of the pressurizing sections respectively pressurizes liquid in a plurality of the pressurizing chambers. A flow passage resistance in the third flow passages is lower than a flow passage resistance in the first flow passages. In the flow passage member, a damper is formed in the fourth flow passage.

A liquid discharge head is provided, which includes a nozzle plate which is formed with nozzles, and a channel member which is formed with pressure chambers and connecting channels for connecting the pressure chambers and the nozzles. The connecting channel includes a plurality of portions which have mutually different channel cross-sectional areas. The plurality of portions includes a first portion which is adjacent to the pressure chamber, and a second portion which is adjacent to the first portion, the first portion being interposed between the pressure chamber and the second portion. The first portion has the smallest channel cross-sectional area of those of the plurality of portions. S1≤0.3×S0 and S1≤0.7×S2 are fulfilled (S0: channel cross-sectional are of the pressure chamber, S1: channel cross-sectional area of the first portion, S2: channel cross-sectional area of the second portion).

In some examples, a fluid dispensing assembly removably mountable in a fluid dispensing system includes a body and a fluidic die attached to the body. A vent is arranged on the body to direct cooling airflow generated by an external airflow generator that is external of and separate from the fluid dispensing assembly into an inner portion of the fluid dispensing assembly, the inner portion being within the body.

Various embodiments provide an ejection device for a fluid. The ejection device includes a first semiconductor wafer, housing, on a first side thereof, a piezoelectric actuator and an outlet channel for the fluid alongside the piezoelectric actuator; a second semiconductor wafer having, on a first side thereof, a recess and, on a second side thereof opposite to the first side, at least one inlet channel for said fluid fluidically coupled to the recess; and a dry-film coupled to a second side, opposite to the first side, of the first wafer. The first and the second wafers are coupled together so that the piezoelectric actuator and the outlet channel are set directly facing, and completely contained in, the recess that forms a reservoir for the fluid. The dry-film has an ejection nozzle.

A liquid ejection head includes a pressure chamber that allows a first liquid and a second liquid to flow inside, a pressure generation element that applies pressure to the first liquid and an ejection port that ejects the second liquid. In a state where the first liquid flows in a direction, crossing a direction of ejection of the second liquid from the ejection port, while being in contact with the pressure generation element and the second liquid flows in the crossing direction along the first liquid in the pressure chamber, the second liquid is ejected from the ejection port by causing the pressure generation element to apply a pressure to the first liquid.

A fluid ejecting device including a die including a perimeter defined by a first edge, a second edge opposing the first edge, a third edge, and a fourth edge opposing the third edge, wherein the third and fourth edges are disposed at an angle to the first and second edges to form angular corners, an active area including circuitry for controlling the fluid ejecting device to eject fluid, an inactive area positioned between the perimeter and the active area, and a termination ring encircling the active area, the termination ring including sides extending parallel to the first, second, third, and fourth edges and corners coupling adjacent sides, the corners having a corner radius greater than a first distance between the first edge and one of the sides of the termination ring, and a nozzle to eject fluid.

Printheads and printers are described herein. In one example, a printhead includes a number of drop generators disposed in a first array and a second array. The drop generators in both the first array and the second array are spaced one dot pitch apart perpendicular to the motion of a print medium, and alternate between a high drop weight (HDW) drop generator and a low drop weight (LDW) drop generator. Each drop generator in the first array is in a line of the motion of the print medium with a corresponding drop generator in the second array, wherein each HDW drop generator in the first array is in line with an LDW drop generator in the second array, and each LDW drop generator in the first array is in line with an HDW drop generator in the second array.

A fluid ejection device includes a fluid slot, at least one fluid ejection chamber communicated with the fluid slot, a drop ejecting element within the at least one fluid ejection chamber, a fluid circulation channel communicated with the fluid slot and the at least one fluid ejection chamber, and a fluid circulating element communicated with the fluid circulation channel. The fluid circulating element is to provide on-demand circulation of fluid from the fluid slot through the fluid circulation channel and the at least one fluid ejection chamber.

According to an example, a base, a diaphragm, and a driving element are provided. The driving element includes a first electrode disposed on a second surface of the diaphragm, a second electrode opposing the first electrode, and a piezoelectric body interposed between the first electrode and the second electrode. In addition, an inter-wiring insulating film that covers the second surface of the diaphragm and the driving element, and an extracting electrode which is on the inter-wiring insulating film, are further provided. The inter-wiring insulating film includes a contact hole that exposes a part of the second electrode and through which the second electrode and the extracting electrode contact each other. The contact hole is disposed at a position which aligned with a solid portion of a circumferential wall of the pressure chamber in the base.

An inkjet printhead including: an elongate fluid manifold having a base comprising a plurality of fluid delivery compartments, each compartment having a fluid outlet and a bubble-venting cavity; and one or more printhead chips attached to the base, each printhead chip receiving printing fluid from one or more fluid outlets. Each fluid outlet is aligned with a respective printhead chip and each bubble-venting cavity is offset from the respective printhead chip.