Provided are an inkjet printing device, a method for aligning a bipolar element, and a method for manufacturing a display device. The inkjet printing device is for ejecting ink and includes a bipolar element extending in one direction. The inkjet printing device comprises: an electric field generation unit which includes a stage and a probe unit for generating an electric field on the stage; and an inkjet head which is positioned above the stage and includes a plurality of nozzles through which the ink is ejected, wherein the nozzles includes an inlet having a first diameter and an outlet connected to the inlet and having a second diameter smaller than the first diameter.

A head module includes: a head including: a nozzle plate having a nozzle from which a liquid is to be discharged; a channel substrate including an individual channel communicating with the nozzle, the nozzle plate bonded to a first bonding surface of the channel substrate; and a cover covering at least one side of a discharge surface of the nozzle plate of the head. The channel substrate has a size larger than the nozzle plate, the cover has a second bonding surface bonded to the first bonding surface of the channel substrate at an outer region of the nozzle plate with an adhesive, the discharge surface of the nozzle plate is liquid-repellent, and the first bonding surfaces of the channel substrate and the second bonding surface of the cover are lyophilic.

In a liquid ejection head, an ejection pressure is applied to a pressure chamber for liquid ejection from a nozzle. A descender extends in a first direction and includes a first end connected to the pressure chamber and a second end. A communication passage is connected to the second end, extends in a second direction crossing the first direction, and has a first dimension in the first direction. The nozzle is positioned at the communication passage such that a shortest distance between an outer periphery thereof and a center of the second end is greater than 0.5 times a second dimension of the second end in the second direction. When viewed in the first direction, the center of the second end and a center of a cross-section defined by the nozzle to be orthogonal to an extending direction of the nozzle intersect an axis of the communication passage.

A liquid discharge head includes: a first member; and a second member bonded to the first member, wherein the first member has: a first protrusion protruding to the second member, a second protrusion protruding to the second member, the second protrusion having a height different from the first protrusion, the second member includes: a first portion bonded to the first protrusion with a first adhesive; and a second portion bonded to the second protrusion with a second adhesive, the second portion having a height different from the first portion, and a type of the second adhesive is different from a type of the first adhesive.

A liquid ejection head includes an ejection opening; a passage in which an energy generation element is disposed; an ejection opening portion that allows communication between the ejection opening and the passage; a supply passage for allowing the liquid to flow into the passage; and an outflow passage for allowing the liquid to flow out to the outside. An expression of H.sup.−0.34×P.sup.−0.66×W>1.7 is satisfied when a height of the passage is set to H [μm], a length of the ejection opening portion is set to P [μm], and a length of the ejection opening portion is set to W [μm].

A method for manufacturing a microstructure comprising cured products of photosensitive resin compositions, the method comprising: a step of forming at least two layers of the photosensitive resin compositions each comprising a photopolymerization initiator; a step of subjecting each of the formed at least two layers of the photosensitive resin compositions to patterning exposure; and a step of collectively developing the exposed at least two layers of the photosensitive resin compositions to obtain a microstructure, wherein in the at least two layers of the photosensitive resin compositions, 90% by mass or more of the photopolymerization initiators contained in at least one of the two adjacent layers of the photosensitive resin compositions is a nonionic photopolymerization initiator.

A fluid jet ejection device, a method of making a fluid jet ejection head, and a method of improving the plume characteristics of fluid ejected from the fluid jet ejection head. The pharmaceutical drug delivery device includes a cartridge body; and a fluid jet ejection cartridge disposed in the cartridge body. The fluid jet ejection cartridge contains a fluid and an ejection head attached to the fluid jet ejection cartridge. The ejection head contains a plurality of fluid ejectors thereon and a nozzle plate having a plurality of fluid ejection nozzles therein associated with the plurality of fluid ejectors. At least one of the plurality of fluid ejection nozzles has an orthogonal axial flow path relative to a plane defined by the nozzle plate and at least one of the plurality of fluid ejection nozzles has an angled axial flow path relative to a plane define by the nozzle plate.

An ejection head. The ejection head includes first fluid ejectors and second fluid ejectors deposited on a semiconductor substrate. A first flow feature layer is attached to the semiconductor substrate to provide a first fluid supply channels and a first fluid chambers and a first portion of second fluid channel and second fluid chambers therein. A second flow feature layer is attached to the first flow feature layer to provide a first portion of first nozzle holes and a second portion of second fluid supply channels and second fluid chambers therein. A first nozzle plate layer is attached to the second flow feature layer to provide a second portion of the first nozzle holes and a first portion of second nozzle holes therein. A second nozzle plate layer is attached to the first nozzle plate layer to provide a second portion of the second nozzle holes therein.

In one example in accordance with the present disclosure, a fluidic ejection controller is described. The fluidic ejection controller includes a firing board to pass electrical control signals for ejecting fluid from a fluidic ejection device. An ejection board of the fluidic ejection controller is electrically coupled to, and selectively removable from, the firing board to pass the electrical control signals to the fluidic ejection device. Electrical pins are disposed on the ejection board in a pattern that matches a pattern of electrical pads on the fluidic ejection device. The electrical pins interface with corresponding electrical pads to pass the electrical control signals from the ejection board to the fluidic ejection device.

A liquid discharge head of the present disclosure includes a flow path member having a plurality of discharge holes, a plurality of pressure chambers, a plurality of first common flow paths, a plurality of second common flow paths, and a plurality of pressure sections. The first common flow paths and the second common flow paths are linked through a connection flow path outside a connection range C, the connection range C being linked through the pressure chambers. The flow path member is configured by laminating a plurality of flat plates. The connection flow path includes holes and/or grooves disposed in plates other than the common flow path plates that constitute the first common flow paths and the second common flow paths.