A pagewide printhead for printing redundantly in four colors. First and second rows of printhead chips are mounted on a common ink manifold having four ink supply channels for supplying four colors of ink to the first and second rows of printhead chips. Dedicated ink outlets interconnect one ink supply channel of the ink manifold with a pair of redundant nozzle rows in each printhead chip.

A liquid ejecting head that has an ejection surface configured to eject a liquid includes a plurality of head chips that are long in a first direction. The plurality of head chips are arranged inside a virtual parallelogram including a first virtual side and a second virtual side that are in contact with at least one of the plurality of head chips and that extend in the first direction, and a third virtual side and a fourth virtual side that are in contact with at least one of the plurality of head chips and that extend in a second direction intersecting the first direction, and the ejection surface is not overlapped with an acute-angled portion of the virtual parallelogram when the ejection surface is viewed in a normal direction of the ejection surface.

Systems and methods are provided for cover plates for printheads. One embodiment is an apparatus that includes a cover plate for a printhead. The cover plate includes multiple layers of electrically conductive material, a layer of nonconductive ferrite that is sandwiched between the multiple layers, and at least one connector that penetrates through the multiple layers and the layer of nonconductive ferrite to form a conductive pathway for electric current between the multiple layers through the layer of nonconductive ferrite. The cover plate also includes at least one opening that penetrates through the multiple layers and the layer of nonconductive ferrite, and that is configured to align with nozzles of the printhead.

An ink jet recording head that includes a substrate having an ejection orifice for ejecting a liquid and a member provided with a recessed portion for accommodating the substrate, the head including a gap formed between a wall of the recessed portion of the member and the substrate, and a sealing material that seals the gap, in which the sealing material contains a cured product of a composition containing at least a hydrogenated bisphenol A type epoxy resin, a solid basic compound, and polythiol.

A liquid ejection head 3 includes: a liquid ejection part 3a configured to eject a liquid; and a guide part 20b provided upstream of the liquid ejection part 3a with respect to a conveying direction A of a recording medium 2 and configured to guide the front end of a recording medium 2 conveyed to the liquid ejection part 3a. The guide part 20b has an inclined surface 20c inclined so as to be more spaced apart from a conveyance path for the recording medium 2 as the inclined surface 20c is more distant from the liquid ejection part 3a.

A piezoelectric device includes a piezoelectric body, a vibration plate that vibrates when the piezoelectric body is driven, a first electrode positioned between the piezoelectric body and the vibration plate, and a second electrode positioned to be separated from the first electrode by the piezoelectric body. The piezoelectric body has an active portion that is a part sandwiched between the first electrode and the second electrode in a first direction along a thickness direction of the piezoelectric body, and a change width of a dC/dV value, which represents a change in capacitance with respect to a change in a voltage applied along a second direction orthogonal to the first direction, from one end of the active portion on a side of the first electrode to the other end of the active portion on a side of the second electrode in the first direction is 10% or less.

An inkjet recording apparatus includes a recording head including an ejection port surface and a nozzle cover, wherein the ejection port surface includes an array of a plurality of ejection ports through which ink is to be ejected, and wherein the nozzle cover protrudes downward with respect to the ejection port surface and is disposed on an outer side of the ejection port surface, a wiper unit capable of wiping the ejection port surface and the nozzle cover, and a moving mechanism configured to move the wiper unit relative to the ejection port surface, wherein the wiper unit has a notch at a position at which the notch faces a first step portion between the ejection port surface and the nozzle cover when the wiper unit performs wiping while the wiper unit is moved by the moving mechanism.

A liquid discharge head includes a plurality of nozzle arrays arranged in a first direction. The plurality of nozzle arrays each includes nozzles from which a liquid is discharged, the nozzles arranged in a second direction intersecting the first direction, and one of two nozzle arrays of the plurality of nozzle arrays adjacent to each other in the first direction include at least two nozzles arranged at different nozzle intervals from corresponding nozzles of another of the two nozzle arrays in the first direction.

A liquid discharge apparatus includes: a liquid discharge head configured to discharge a liquid from a nozzle, the liquid discharge head including: a liquid chamber communicating with the nozzle; a pressure generator configured to deform the liquid chamber to apply pressure to the liquid in the liquid chamber; and circuitry configured to apply a drive signal to the pressure generator to drive the pressure generator, the drive signal including at least one drive pulse. The drive pulse includes: an expansion element to expand the liquid chamber to a first volume; a holding element to hold the first volume of the liquid chamber expanded by the expansion element for a predetermined time; and a contraction element to contract the liquid chamber from the first volume held by the holding element to a second volume.

A recording head includes an ink ejection portion and an ink holding portion. The ink holding portion includes a sheet portion and a holding portion. The sheet portion has an upper end side fixed to the ink ejection portion and a lower end side movable in a direction of coming closer to or separating away from a side surface of the ink ejection portion. The holding portion is located at a lower end portion of the sheet portion on the ink ejection portion side, is disposed to come into contact with or close to the side surface of the ink ejection portion, and is configured to hold an ink in an adjacent region with respect to the ink ejection portion.