A fluid jet ejection device, a method of making a fluid jet ejection head for a fluid ejection device, and a method of improving the plume characteristics of fluid ejected from the fluid jet ejection head. The fluid jet ejection 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, wherein a first portion of the plurality of fluid ejection nozzles have a first axial flow path length and a second portion of the plurality of fluid ejection nozzles have a second axial flow path length greater than the first axial flow path length.

A liquid discharge head includes a nozzle plate, an individual liquid chamber, and an actuator. The nozzle plate has a nozzle on a liquid discharge face and a through hole communicating with the nozzle and penetrating the nozzle plate. The nozzle plate includes a substrate including a first silicon layer on a side of the liquid discharge face, a second silicon layer, a first silicon oxide film layer, and a second silicon oxide layer on a surface of the second silicon layer different from a surface of the second silicon layer in contact with the first silicon oxide film layer. A thickness of the first silicon layer is smaller than a thickness of the second silicon layer. A portion of the through hole penetrating the first silicon layer has a smaller diameter than a portion of the through hole penetrating the second silicon layer.

A liquid ejecting apparatus includes a liquid ejecting head that has an ejection surface including a first nozzle row configured to eject a first ink and a second nozzle row configured to eject a second ink. The liquid ejecting head is configured to be held in a first posture in which the ejection surface is inclined with respect to a horizontal plane. The dynamic surface tension of the first ink is higher than the dynamic surface tension of the second ink. In the first posture, the first nozzle row is positioned above the second nozzle row with respect to a gravity direction.

A liquid ejection head includes a flow path-forming part having a flow path for liquid supplied from a liquid reservoir and a plurality of outlet ports for discharging the liquid, a liquid ejecting unit having a plurality of inlet ports into which the liquid flows and a plurality of ejection element rows corresponding to the inlet ports and each having a plurality of ejection elements to eject the liquid, and a sealing member having a sealing opening which allows communication between the plurality of outlet ports and the plurality of inlet ports. sealing member seals a portion between the flow path-forming part and the liquid ejecting unit so that the plurality of outlet ports and the plurality of inlet ports are in communication. A plurality of the sealing openings are provided for the sealing member, and at least one of the sealing openings has at least two inlet ports.

The first nozzle channel includes a first portion including an end of the first nozzle channel and a second portion including another end of the first nozzle channel, and a width of the second portion in the second direction is larger than a width of the first portion in the second direction.

A liquid discharge apparatus includes an individual flow passage member; and a common flow passage member joined to the individual flow passage member in a first direction. The individual flow passage member has nozzle groups formed on a surface on a side opposite to the common flow passage member and connecting hole groups formed on a surface on a side of the common flow passage member; and the common flow passage member has manifold flow passages corresponding to the connecting hole groups respectively. Each of the nozzle groups includes nozzles aligned in a second direction orthogonal to the first direction; and each of the connecting hole groups includes connecting holes aligned in the second direction and connected to the nozzles respectively. Each of the manifold flow passages extends in the second direction and is connected to the nozzles via the connecting holes.

A printing device includes a frame, and an electronic circuit-board unit attached to the frame. The electronic circuit-board unit includes: a holder including a holding portion; a first substrate held to a first surface of the holder; a second substrate held to a second surface of the holder and attached to the frame; an electronic component; and a harness electrically connected to the electronic component. The holder has: a first region overlapped with the first substrate in a plan view; and a second region offset from the first region in the plan view. At least one of the electronic component and the harness is held by the holding portion.

A liquid ejecting apparatus includes a liquid ejecting head that has an ejection surface including a first nozzle row configured to eject a first ink and a second nozzle row configured to eject a second ink. The liquid ejecting head is configured to be held in an inclined posture in which the ejection surface is inclined with respect to a horizontal plane. The viscosity of the first ink is lower than the viscosity of the second ink, and in the inclined posture, the first nozzle row is positioned above the second nozzle row with respect to a gravity direction.

A printing apparatus and a method of providing printing apparatus are provided. A printing apparatus according to at least one embodiment of the present disclosure includes a base panel or head base, at least one or more head packs installed on the head base, a head pack holder installed on each of the head packs and configured to handle and fix the head pack, and a fastening structure configured to mount the head pack holder to the head packs.

A liquid discharge head includes a nozzle member. The nozzle member includes a nozzle, a deformable laminar member, and an electromechanical transducer. The nozzle discharges liquid. The deformable laminar member has an opening forming the nozzle. The electromechanical transducer is disposed around the opening. The nozzle member is warped with respect to a discharge-side plane of the nozzle member in a surrounding area of the nozzle when no voltage is applied to the electromechanical transducer.