A cover member includes two end regions located at two ends in a first direction, and two beam portions which extend in the first direction and connect the two end regions together and which, together with the two end regions, form a single opening that exposes a plurality of discharge ports. When a width of the opening is denoted as a [mm], a minimum length in the first direction of the end regions is denoted as c [mm], a modulus of longitudinal elasticity of the cover member is denoted as E [GPa], and a thickness of the cover member is denoted as t [mm], the following expression is established.

[00001]$c\ge \frac{10.Math.{\left(\frac{a}{25}\right)}^4}{{\left(\frac{t}{0.3}\right)}^3.Math.\left(\frac{E}{200}\right)}$

A planarization layer and method therefor. The planarization layer has a thickness ranging from about 2 to about 3 microns, and contains from about 8.0 to about 8.5 wt. % photoacid generator; from about 2 to about 3.6 wt. % photoinitiator; from about 0.35 to about 0.5 wt. % green dye; from about 35 to about 46 wt. % multifunctional epoxy compound; from about 35 to about 50 wt. % of one or more difunctional epoxy compounds; and from about 1 to about 2.6 wt. % silane adhesion promoter, wherein all weight percent is based on a total weight of the layer devoid of solvent.

An integrated circuit to drive a plurality of fluid actuation devices includes a contact pad and a programmable pulldown device. The programmable pulldown device is electrically coupled to the contact pad. The programmable pulldown device is settable to any one of a plurality of resistances.

A device includes a first column of contact pads. The device also includes a column of fluid actuation devices disposed longitudinally to the first column of contact pads.

An integrated circuit to drive a plurality of fluid actuation devices includes a plurality of contact pads, a plurality of pulldown devices, and control logic. The plurality of contact pads include a first contact pad and a second contact pad. Each of the pulldown devices is electrically coupled to a corresponding contact pad. The control logic enables at least a portion of the pulldown devices in response to both a logic low signal on the first contact pad and a logic low signal on the second contact pad.

A pressure chamber of each of channels of an inkjet head has a non-rotating body shape around an axis perpendicular to a support substrate on which the pressure chamber is formed. The direction of the pressure chamber corresponding to a rotation angle from a reference position around the axis passing through the pressure chamber is defined as the direction of the pressure chamber. A plurality of channels arranged in a same row in a direction parallel to the substrate includes channels and having the pressure chamber facing different directions. In a same row, channels (e.g. channel 21a.sub.1) driven by a same circuit element (e.g. circuit element) are arranged such that the pressure chambers face a same direction.

A print head assembly (PHA) includes a microelectromechanical systems (MEMS) die mounted to a substrate with an application specific integrated circuit (ASIC). The die includes an opening defined in the die, a plurality of nozzles adjacent to the opening in fluid communication with the opening, and a pad to receive electrical control signals. The ASIC includes a communication link and a plurality of transmission lines that transmit electrical signals to the MEMS die.

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.

A print head has an ink slot and a sensing chamber having a first port connected to the fluid slot and a second port. The sensing chamber contains an ink level sensor. A recirculation passage extends from the fluid slot and is fluidly coupled to the second port. A fluid pump circulates fluid through the recirculation passage.

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.