A liquid ejection head includes first individual channels arranged in a first direction, a first common channel extending in the first direction and communicating with the first individual channels, and a second common channel located below the first common channel and extending in the first direction. The second common channel communicates with the first individual channels. Each of the first individual channels includes one of first nozzles, and one of first pressure chambers that communicate with the respective first nozzles and are located above the first nozzles. The first common channel and the second common channel overlap, in a vertical direction, with each other at a position above the first pressure chambers. The first common channel overlaps, in the vertical direction, with the first pressure chambers. The second common channel does not overlap, in the vertical direction, with the first pressure chambers.

A liquid ejection head includes a plurality of first individual channels arranged in a first direction, a first common channel extending in the first direction and communicating with the first individual channels, and a second common channel located below the first common channel and extending in the first direction. The second common channel communicates with the first individual channels. Each of the first individual channels includes one of first nozzles, and one of first pressure chambers that communicate with the respective first nozzles and are located above the first nozzles. The first common channel and the second common channel overlap, in the vertical direction, with each other at a position above the first pressure chambers. Each of the first common channel and the second common channel at least partially overlaps, in the vertical direction, with the first pressure chambers.

A liquid ejecting head includes a substrate where a first nozzle and a second nozzle that eject liquid. The substrate is formed with a plurality of hole portions which communicate with a supply liquid chamber and in each of which a meniscus for absorbing pressure variation of liquid inside the supply liquid chamber is formed. The plurality of hole portions include a first hole portion. A distance between an end portion of a first supply flow path on a side of the supply liquid chamber and the first hole portion is equal to a distance between an end portion of a second supply flow path on a side of the supply liquid chamber and the first hole portion.

A liquid discharge head includes a nozzle from which a liquid is discharged, a pressure chamber communicating with the nozzle, to which the liquid is supplied, a dummy channel not communicating with the nozzle and adjacent to the pressure chamber, the dummy channel being a sealed place to which the liquid is not supplied, and a diaphragm configured to define a displaceable wall of the pressure chamber and a wall of the dummy channel. The wall of the dummy channel defined by the diaphragm includes a through hole.

A liquid ejecting head including: an individual flow path row in which a plurality of individual flow paths communicating with a nozzle that ejects a liquid in a first axis direction are arranged in parallel along a second axis orthogonal to a first axis, and a first common liquid chamber communicating with the plurality of individual flow paths, in which each of the plurality of individual flow paths has a pressure chamber that stores a liquid.

A liquid ejecting head including: an individual flow path row in which a plurality of individual flow paths communicating with a nozzle that ejects a liquid in a first axis direction are arranged in parallel along a second axis orthogonal to a first axis, and a first common liquid chamber communicating with the plurality of individual flow paths, in which each of the plurality of individual flow paths has a pressure chamber that stores a liquid.

Methods for manufacturing a microfluidic delivery device comprising a semiconductor structure, such as silicon, are provided. In particular, the structure for delivering fluid may be formed from polycrystalline silicon, also called polysilicon, or epitaxial silicon. The microfluidic delivery device that predominantly uses semiconductor material, such as silicon, to form the structures that are in contact with the dispensed fluid results in a device that is compatible with a wide set of fluids and applications.

A liquid ejecting apparatus includes: a recording head that ejects liquid; a pressurizing mechanism that supplies the liquid under pressure; a valve-mechanism provided between the pressurizing mechanism and the recording head, the valve-mechanism including a liquid storage chamber storing the liquid supplied under pressure, a pressure chamber that is provided closer to the recording head than to the liquid storage chamber and stores the liquid, and a valve body that moves in a valve opening direction according to a negative pressure in the pressure chamber to communicate the liquid storage chamber with the pressure chamber; and a pressure control section controlling a pressure of the liquid supplied from the pressurizing mechanism to the valve-mechanism. The pressure control section controls the pressure of the liquid that is supplied under pressure by the pressurizing mechanism to the liquid storage chamber, to move the valve body in the valve opening direction.

A liquid discharge head includes a plurality of nozzles through which a liquid is discharged, the plurality of nozzles arrayed in a nozzle array direction, a plurality of pressure chambers respectively communicating with the plurality of nozzles, a plurality of individual channels respectively communicating with the plurality of pressure chambers, a common channel communicating with each of the plurality of individual channels, an individual-channel member including the plurality of pressure chambers and the plurality of individual channels, a common-channel member including the common channel, and a partition between the individual-channel member and the common-channel member. The partition includes a plurality of through-hole regions each connecting the common channel and the plurality of individual channels, and a plurality of recoverably-deformable regions facing the common channel.

In one example in accordance with the present disclosure, a fluidic ejection die is described. The die includes an array of nozzles. Each nozzle includes an ejection chamber and an opening. A fluid actuator is disposed within the ejection chamber. The fluidic ejection die also includes an array of passages, formed in a substrate, to deliver fluid to and from the ejection chamber. The fluidic ejection die also includes an array of enclosed cross-channels. Each enclosed cross-channel of the array of enclosed cross-channels is fluidly connected to a respective plurality of passages of the array of passages.