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.

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.

There is provided a liquid discharge apparatus configured to discharge a liquid, including a channel member for the liquid. The channel member is formed to include: a pressure chamber configured to contain the liquid; a nozzle configured to discharge the liquid; a connection channel connecting the pressure chamber and the nozzle; and a discharge channel which is connected to the connection channel so as to discharge the liquid in the connection channel or connected to the pressure chamber so as to discharge the liquid in the pressure chamber. An intersection line between an orthogonal plane orthogonal to an extending direction of the discharge channel and an upper surface of the discharge channel defining an upper portion of the discharge channel has an arc-like shape protruding upwardly.

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.

There is provided a liquid discharge apparatus including: a plurality of individual channels; a supply channel; a return channel; an open/close valve; a pump provided on the return channel; and a controller. In a case that the controller removes an air bubble, the controller is configured to execute: circulation of the liquid along a circulation route by maintaining the open/close valve at an open position and driving the pump; and then moving of the liquid from the storing chamber to the plurality of individual channels via the return channel so as to exhaust the liquid from the plurality of nozzles of the plurality of individual channels, respectively, by maintaining the open/close valve at a close position and driving the pump.

A liquid discharging head includes a nozzle plate having a plurality of nozzles from which liquid is discharged; a plurality of individual liquid chambers that are communicably connected to the plurality of nozzles, respectively; a common liquid chamber that supplies liquid to the plurality of individual liquid chambers; and a circulation common liquid chamber that leads to a plurality of circulation channels. A part of the common liquid chamber overlaps the circulation common liquid chamber from a direction in which liquid is discharged from the nozzles, and another part of the common liquid chamber overlaps the circulation common liquid chamber from a direction orthogonal to both the direction in which liquid is discharged from the nozzles and a direction in which the nozzles are aligned.

A liquid discharge head includes: a liquid chamber; a supply flow path supplying liquid to the liquid chamber; a discharging flow path being provided away from the supply flow path in a horizontal direction and discharging the liquid from the liquid chamber; a first-connecting-flow-path communicating between the liquid chamber and the supply flow path; and nozzles for discharging the liquid supplied from the liquid chamber. The first-connecting-flow-path includes a first-supply-bottom-surface inclined downward with respect to a horizontal plane at a first-angle from the supply flow path toward the liquid chamber, and a second-supply-bottom-surface located between the first-supply-bottom-surface and the liquid chamber and inclined downward with respect to the horizontal plane at a second-angle from the first-supply-bottom-surface toward the liquid chamber. The first-angle is greater than or equal to 0 degrees and is less than 90 degrees, and the second-angle is greater than the first-angle and is less than 90 degrees.

The flow channel forming substrate has a partition wall which is disposed between two of the outlet flow channels adjacent to each other and which partitions the outlet flow channel.

The present invention relates to an ink container for an inkjet printer, the ink container being configured to prevent a problem caused by fine bubbles accumulated in the ink container. As the ink container containing ink for supplying ink to an inkjet head having a plurality of nozzles that discharge ink, the ink container includes: a bottom surface inclined so that a first side thereof connected to a return line through which ink is returned from the inkjet head is positioned higher than a second side thereof connected to a supply line through which ink is supplied to the inkjet head; and a bubble removing net provided between the supply line and the return line to remove bubbles from ink contained in the ink container.

A liquid tank includes a liquid supply portion, a first liquid chamber, a liquid communication flow path and an air communication flow path. The liquid communication flow path includes an upstream end which is connected to the first liquid chamber, a rising flow path which is located on a downstream side with respect to the upstream end and which extends upward in a mounting state, a lowering flow path which is located on the downstream side with respect to the rising flow path and which extends downward in the mounting state and a downstream end which is located on the downstream side with respect to the lowering flow path and which is connected to the liquid supply portion. In the mounting state, the liquid supply portion is located lower than the downstream end and extends downward toward a liquid supply port.