The nozzle is provided so that a difference between a maximum value and a minimum value of distances, at the second position, between the center portion and edge portions of the nozzle is smaller than a difference between a maximum value and a minimum value of distances, at the first position, between the center portion and edge portions of the nozzle.

An ink jet recording method includes an ink attachment step, in which an aqueous ink composition is ejected from a recording head and attached to a recording medium, and a treatment liquid attachment step, in which a treatment liquid containing a flocculant is ejected from a recording head and attached to the recording medium. The recording head for ejecting the treatment liquid has a circulation channel in which the treatment liquid is circulated.

A liquid discharge head includes a nozzle substrate and a cover member. The nozzle substrate includes a liquid discharge surface, a plurality of nozzles, and a continuous recess. The plurality of nozzles is arranged in a nozzle arrangement area on the liquid discharge surface and configured to discharge liquid from the liquid discharge surface. The continuous recess surrounds the nozzle arrangement area on the liquid discharge surface. The cover member is joined to the nozzle substrate with the nozzle arrangement area being exposed. The nozzle arrangement area has a liquid repellency with respect to the liquid. An inside of the recess is lyophilic to the liquid and is provided with an adhesive, and the nozzle substrate is joined to the cover member with the adhesive.

A liquid ejecting head includes a nozzle substrate in which a nozzle that ejects a liquid is formed and a flow path substrate that is joined to the nozzle substrate. The flow path substrate includes a pressure chamber that communicates with the nozzle and a first liquid storage chamber that stores the liquid to be supplied to the pressure chamber. The nozzle substrate includes a first damper chamber and one or more first hole portions which communicate with the first liquid storage chamber and the first damper chamber and in which a meniscus for absorbing a pressure fluctuation of the liquid in the first liquid storage chamber is formed.

A liquid ejection head includes a stack structure including plates stacked and bonded with an adhesive agent, individual channels formed in the stack structure, dummy channels formed in the stack structure separately from the individual channels, and a first relief groove formed in the stack structure separately from the individual channels and configured to trap therein an excessive adhesive agent. Each individual channel includes a pressure chamber to which pressure is applied for liquid ejection form a nozzle, a supply throttle channel connected to the pressure chamber, and a return throttle channel communicating with the pressure chamber. The supply throttle channel and the return throttle channel each have a smaller cross-sectional area than the pressure chamber. The dummy channels include dummy chambers arranged laterally to an array of the pressure chambers arranged in an array direction. The first relief groove is connected to the dummy channels.

An ink jet printing method includes an ink application step of ejecting at least an aqueous ink composition onto a printing medium from an ink jet head having a circulation path system through which the ink composition circulates. The ink composition contains resin particles made of a resin having an acid value of 10 mg KOH/g or less and an amino alcohol having a normal boiling point of 320° C. or less and optionally a pigment as a coloring material. The resin particles and the pigment, in total, account for 17% or less relative to the total mass of the ink composition.

There are provided a head chip and so on capable of improving the print image quality. The head chip according to an embodiment of the present disclosure is provided with an actuator plate having a plurality of ejection grooves and a nozzle plate having a plurality of nozzle holes individually communicated with the plurality of ejection grooves. The plurality of ejection grooves is arranged side by side so as to at least partially overlap each other along a predetermined direction. Further, the nozzle holes adjacent to each other along the predetermined direction out of the plurality of nozzle holes are arranged so as to be shifted from each other along an extending direction of the ejection grooves in the nozzle plate.

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.

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.