A liquid ejecting apparatus is provided with pressure generating units for pressure chambers one of which is provided for each of a plurality of nozzles and drives the pressure generating units corresponding to liquid ejection requests which request liquid ejection from the nozzles while achieving supplying of a liquid to the pressure chambers and collection of the liquid which has passed through the pressure chambers. Accordingly, the liquid is ejected from the nozzles. Meanwhile, an occurrence of a fault in the liquid ejection is determined using a vibration transition of a residual vibration which occurs in the liquid of the pressure chambers according to a pressure change accompanying driving of the pressure generating units, and driving of the pressure generating unit of an ejection fault pressure chamber in which it is determined that a fault occurs in the liquid ejection is stopped spanning at least a fixed stopping period.

A first opening being a coupling port between the third flow path and the first flow path and a second opening being a coupling port between the second flow path and the first flow path are positioned toward the +Z direction, which is the first direction, of the first flow path.

In a liquid ejecting head, a reduction in mechanical strength due to a liquid chamber provided to circulate a liquid is limited. The liquid ejecting head includes: a nozzle plate provided with a nozzle; a flow channel forming unit provided with a pressure chamber to which a liquid is supplied, a communication channel through which the nozzle and the pressure chamber communicate with each other, and a circulating liquid chamber communicating with the communication channel; and a pressure generating unit that generates a pressure change in the pressure chamber. A height at a first location in the circulating liquid chamber is larger than a height at a second location on a side of the communication channel when viewed from the first location.

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.

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.

A liquid ejection head includes a supply manifold, a return manifold, and individual channels each connected, at its upstream end, to the supply manifold and, at its downstream end, to the return manifold. Each of the individual channels communicates with a corresponding one of nozzles arranged in an array on a nozzle surface. The supply manifold and the return manifold extend in an extending direction along the nozzle array. The return manifold includes a lower portion located below the supply manifold to overlap the supply manifold in plan view orthogonal to the nozzle surface, and a standing portion located at at least one of opposite ends of the lower portion in the extending direction to be outside the supply manifold in plan view. The standing portion has a height to cover at least a portion of an end of the supply manifold when viewed in the extending direction.

An ink-jet recording apparatus may include an ink-jet head having: individual connection flow channels through which ink can be discharged from pressure chambers; and a common flow channel at which ink from the individual connection flow channels merges, wherein when the ink is ejected, in a nozzle through which the maximum amount of ink per unit time is ejected, the relationship of (Fn/Fi)10 is satisfied, Fn representing the amount of ink ejected per unit time from the nozzle, and Fi representing the average flow rate of ink discharged per unit time from the individual connection flow channels, and the relationship of (Rc/Rt)10 is satisfied, Rc representing the flow channel resistance of the common flow channel, and Rt representing the synthetic resistance of the individual connection flow channels.

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 ejecting head including a diaphragm constituting a portion of a wall surface of a pressure chamber that accommodates a liquid, and a piezoelectric element that vibrates the diaphragm. In the liquid ejecting head, the diaphragm includes a plurality of layers, and the plurality of layers include a compressive film that has compressive stress and a tensile film that has tensile stress. The compressive film and the tensile film are two layers adjacent to each other that have a largest tension difference among the plurality of layers, and an absolute value of the tension difference between the compressive film and the tensile film is 400 [N/m] or smaller.

Provided is a liquid discharging head including: a nozzle discharging a liquid; a chamber plate having a plurality of pressure chambers, drive elements provided in correspondence with each pressure chamber, and a plurality of lead electrodes for supplying electric signals to the drive elements; and a circuit substrate having terminals coupled to the lead electrodes. A first pressure chamber and a second pressure chamber communicate with the nozzle in common. A first segment electrode is formed so as to overlap the first pressure chamber and is not to overlap the second pressure chamber in plan view. A second segment electrode is formed so as to overlap the second pressure chamber and is not to overlap the first pressure chamber in plan view. The first segment electrode and the second segment electrode are coupled to the same lead electrode.