In a droplet discharge head, in an initial state in which a tip of the actuator has contact with the vibrating plate, and the actuator pushes the vibrating plate toward the first direction, based on a drive signal from the control section, the tip of the actuator displaces the vibrating plate toward the second direction in a state of having contact with the vibrating plate to thereby pull in a meniscus in the nozzle toward the liquid chamber, then, the tip of the actuator is separated from the vibrating plate to further displace the vibrating plate toward the second direction, and then, the tip of the actuator collides with the vibrating plate to thereby displace the vibrating plate toward the first direction to discharge the liquid from the nozzle.

A liquid ejecting head including: a liquid ejecting portion configured to eject a liquid; a supply flow path configured to supply the liquid to the liquid ejecting portion; and a discharging flow path configured to discharge the liquid from the liquid ejecting portion, in which a supply portion along a horizontal plane in the supply flow path and a discharging portion along the horizontal plane in the discharging flow path have different positions with respect to a direction perpendicular to the horizontal plane.

A liquid ejecting head including nozzles ejecting a liquid, a flow path member including flow paths that communicate with the nozzles, and an electric substrate stacked on the flow path member in a first direction. The flow path member includes pipes that protrude in the first direction from a surface facing the electric substrate, the flow paths respectively being formed inside the pipes. Through holes through which the pipes are inserted are provided in the electric substrate. The through holes include a first through hole and a second through hole. The pipes include a first pipe that includes a first contact surface that contacts an internal circumferential surface of the first through hole and a second pipe that includes a second contact surface that contacts an internal circumferential surface of the second through hole.

A liquid ejecting unit including a flow path structure into which a liquid flow from a liquid reservoir that temporarily stores the liquid, a liquid ejecting head coupled to the flow path structure and including a nozzle for ejecting the liquid supplied from the flow path structure, and a heating portion heating the liquid inside the flow path structure.

A liquid ejecting head includes: a flow channel forming substrate that forms an individual flow channel including a nozzle and a pressure chamber, a first common liquid chamber, and a second common liquid chamber; and a pressure generating element that causes a pressure change in a liquid in the pressure chamber, in which the first common liquid chamber is coupled to the second common liquid chamber via the individual flow channel, a compliance of the first common liquid chamber is larger than a compliance of the second common liquid chamber, and in the individual flow channel, a flow channel resistance between a first coupling portion with the first common liquid chamber and the pressure chamber is smaller than a flow channel resistance between a second coupling portion with the second common liquid chamber and the pressure chamber.

A head unit includes: a head module having a nozzle surface; a casing; a first connector having a first communication opening; a second connector having a second communication opening; a first liquid-passage tube connected to the first communication opening; first and second branch-liquid-passage tubes connected to the first liquid-passage tube; a first tube joint connecting the first liquid-passage tube to the first and second branch-liquid-passage tubes; a second liquid-passage tube connected to the second communication opening; third and fourth branch-liquid-passage tubes connected to the second liquid-passage tube; and a second tube joint connecting the second liquid-passage tube to the third and fourth branch-liquid-passage tubes. The first tube joint is disposed between the second connector and the second tube joint when viewed in a direction parallel with the nozzle surface.

In a droplet discharge head, in an initial state in which a tip of the actuator has contact with the vibrating plate, and the actuator pushes the vibrating plate toward the first direction, based on a drive signal from the control section, the tip of the actuator displaces the vibrating plate toward the second direction in a state of having contact with the vibrating plate to thereby pull in a meniscus in the nozzle toward the liquid chamber, then, the tip of the actuator is separated from the vibrating plate to further displace the vibrating plate toward the second direction, and then, the tip of the actuator collides with the vibrating plate to thereby displace the vibrating plate toward the first direction to discharge the liquid from the nozzle.

A liquid ejecting head supported by a support body includes: a first head chip; a holder having a holding portion holding the first head chip and a flange portion; and a heater heating the holding portion, in which the holding portion has a heat receiving portion receiving heat from the heater, and a shortest path of heat transferred through the holder from the heat receiving portion to the flange portion is bent or curved at two or more points.

A liquid dispensing element is provided. The element comprising; a dispensing plate comprising a plurality of orifices; the dispensing plate at least partially defining a fluid flow path; a plurality of piezoelectric transducers each comprising a piston configured to move perpendicular to the dispensing plate between a first position wherein the piston is close to the dispensing plate and a second position wherein the piston is further from the dispensing plate. The movement between the first and second positions results in the ejection of a droplet of fluid via a surface cavitation droplet ejection process such that the diameter of the droplet is less than a diameter of the orifice.

A liquid discharge head includes: a nozzle hole from which a liquid is dischargeable in a discharge direction; a liquid chamber in communication with the nozzle hole; a needle valve movable in the discharge direction to be separatable from or contactable with the nozzle hole to open or close the nozzle hole; a driver to move the needle valve in the discharge direction; a housing having: the liquid chamber; and a housing chamber housing the needle valve and the driver; and a sheet member having a shape of a sheet and a flexibility to deform in the discharge direction, the sheet member including: an inner circumference fitted to an outer circumference of the needle valve; and a rim secured to the housing.