A liquid cartridge includes: a housing; a circuit board including an electrode; and an ink supply portion extending from the housing in a depth direction. The housing includes: an cover; and a base provided with a plurality of engaging pawls. The cover includes: a top wall; a peripheral wall formed with a plurality of engaging holes for engagement with the engaging pawls; a support portion supporting the circuit board; a first protrusion and a second protrusion protruding from the top wall. The plurality of engaging holes is open in a width direction and includes a first engaging hole and a second engaging hole spaced away from each other in the depth direction. A front end of the second protrusion is positioned further frontward than a foremost edge of the first engaging hole that is positioned foremost in the depth direction among the plurality of engaging holes.

An ink tank includes an ink storage portion configured to store ink, and a flexible damper portion configured to communicate with an inside of the ink storage portion through a communication hole. A protruding portion protruding from an ink storage portion side toward an inside of the damper portion is formed in the inside of the damper portion. When viewed from a direction in which the protruding portion protrudes, the damper portion surrounds an entire circumference of the communication hole, and an opening portion is formed in the protruding portion.

An object is to provide a liquid ejecting apparatus that enables a liquid storage container to be properly and easily refilled with a liquid from a liquid refilling container without causing color mixture in the liquid storage container. The liquid ejecting apparatus includes liquid storage containers each configured to feed the liquid to a liquid ejecting portion and liquid refilling containers each configured to refill the liquid storage container with the liquid. A first fitting unit is provided around a liquid injection port in each of the liquid storage containers. A second fitting unit is provided around a liquid pour-out port in each of the liquid refilling containers. The second fitting unit is fitted to the first fitting unit to enable the liquid to be delivered from the liquid pour-out port to the liquid injection port.

A tank includes: a wall separating a liquid storage chamber, which stores a liquid to be supplied to a liquid consuming part, from an outside; an inlet penetrating the wall; and a liquid outflow part which allows the liquid to flow to the outside of the liquid storage chamber. The wall includes a view wall, which extends upward and downward and allows a user to visually check a liquid level in the liquid storage chamber, and a bottom wall, which defines an inner bottom surface of the liquid storage chamber by being connected to the view wall. The inner bottom surface of the bottom wall includes an inclined part which extends from at least a part of the view wall to incline downward in a direction away from the view wall.

A water-based ink includes a pigment, water, a penetrating agent, and a binder resin. The penetrating agent includes a compound of formula (1). x is greater than or equal to 6. The binder resin includes a urethane bond. A content of the binder resin in the water-based ink is greater than 1.0 mass %. The compound of formula (1) is preferably diethylene glycol monohexyl ether. The water-based ink preferably further includes an organic solvent having a solubility parameter (SP) value of 12 to 14.

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A liquid circulation device includes a circulation passage, a liquid feeding device, a pressure sensor, and control circuitry. Through the circulation passage, liquid circulates to be supplied to and collected from a circulatory liquid discharge head. The liquid feeding device is configured to circulate the liquid through the circulation passage. The pressure sensor is configured to detect a pressure of the circulation passage. The control circuitry configured to acquire a characteristic indicating a relationship among a drive amount of the liquid feeding device, discharge information of the liquid discharged from the liquid discharge head, and a pressure detection value of the circulation passage; and change, based on the characteristic acquired, at least one of a control parameter and a calculation expression used to control the liquid feeding device.

A liquid cartridge includes a chamber configured to store liquid therein, with a liquid outlet configured to supply the liquid from an interior of the chamber to an exterior of the chamber. A detector is positioned in the chamber so as to be rotatable between a released position and a restricted position. The detector has a detection portion and a restriction portion with a first contact surface defining a first length. A restriction member includes a second contact surface that defines a second length greater than the first length. The restriction member is movable straightly between a first position in which the first and second contact surfaces contact one another, a second position in which the first and second contact surfaces do not contact one another, and a third position between the first and second positions in which the first and second contact surfaces contact one another.

To provide a photopolymerizable inkjet ink, which contains photopolymerizable monomers containing at least one selected from the following compound group (A) compounds of which are negative for skin sensitization, and at least one selected from the following compound group (B) compounds of which are negative for skin sensitization, wherein the compound group (A) is a compound group consisting of caprolactone-modified dipentaerythritol hexaacrylate, polyethoxylated tetramethylol methane tetraacrylate, ethylene oxide-modified bisphenol A diacrylate, caprolactone-modified hydroxy pivalic acid neopentyl glycol diacrylate, polypropylene glycol diacrylate [CH.sub.2═CH—CO—(OC.sub.3H.sub.6)n-OCOCH═CH.sub.2 (n≈12)], hydroxyethyl acryl amide, trimethylol propane trimethacrylate, and tricyclodecane dimethanol dimethacrylate, and the compound group (B) is a compound group consisting of ethylene oxide-modified phenolacrylate, isostearyl acrylate, ethylene oxide-modified trimethylol propane trimethacrylate, stearyl methacrylate, and glycerin dimethacrylate.

A liquid storage container unit according to the present invention includes: a liquid storage container provided with an opening; a plug which is attachable to and detachable from the opening and provided with a front edge to be inserted in the opening; and a support member which connects the plug and a member other than the plug and supports the plug, wherein the support member is molded into a shape with a curved portion and the front edge of the plug comes closer to the inner side surface of the curved portion of the support member in a state in which the plug is removed from the opening than in a state in which the plug is attached to the opening.

An aqueous ink for ink jet, the aqueous ink containing a pigment and a resin. The pigment is impregnated with a compound having a structure in which at least two structures each represented by General Formula (1) are bonded by a glycoside bond.

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