Abstract: Provided is a liquid ejection head for ejecting a liquid while being scanned in a main scanning direction, including: a circulation pump capable of supplying the liquid from a supply channel into a pressure chamber, and collecting the liquid in the pressure chamber through a collection channel and sending the liquid to the supply channel; a first pressure adjustment unit disposed between an outlet channel of the circulation pump and the supply channel; a second pressure adjustment unit disposed between an inlet channel of the circulation pump and the collection channel. At least one of the first pressure adjustment unit or the second pressure adjustment unit is configured such that pressures with different signs relative to a pressure at rest are generated in response to a forward scan and a backward scan in the main scanning direction.

Abstract: A liquid ejection head has an ejection module including a pressure chamber and an ejection element configured to eject a liquid in the pressure chamber, a supply channel, a collection channel connected to the supply channel through a pressure chamber, a first pressure adjustment unit, a second pressure adjustment unit, and a circulation pump. A controlled pressure in the first pressure adjustment unit is set higher than a controlled pressure in the second pressure adjustment unit. A pressure reception area of a second flexible member and a second pressing plate in a second pressure control chamber in a case where a second opening is brought into an open state is smaller than a pressure reception area of a first flexible member and a first pressing plate in a first pressure control chamber in a case where a first opening is brought into an open state.

Abstract: A liquid refill container for refilling a liquid discharge apparatus with liquid includes a liquid storage portion, a pouring portion, and a cap portion. The liquid storage portion is made of a metal and contains liquid. The pouring portion is removeably connected to the liquid storage portion and has an outlet for pouring the liquid. The cap portion is removeably attached to the pouring portion and covers the outlet.

Abstract: A piezoelectric pump, for causing the flow of a liquid, including a piezoelectric member driven by applying a voltage, a diaphragm which is deformed by the driving of the piezoelectric member, an adhesive member which bonds the piezoelectric member and the diaphragm together, and an urging member that urges the piezoelectric member toward the diaphragm.

Abstract: A liquid refill container for refilling a liquid discharge apparatus with liquid includes a liquid storage portion, a pouring portion, and a cap portion. The liquid storage portion is made of a metal and contains liquid. The pouring portion is removeably connected to the liquid storage portion and has an outlet for pouring the liquid. The cap portion is removeably attached to the pouring portion and covers the outlet.

Abstract: A liquid ejection apparatus includes: a liquid storage unit; a liquid ejection head; a liquid communication path to communicate the liquid storage unit with the liquid ejection head; and a liquid pressurization unit to supply a liquid in the liquid storage unit to the liquid ejection head through the liquid communication path by pressurization. The liquid ejection head includes: an inlet; a pressure chamber; and a circulation path through which the liquid supplied from the liquid communication path is circulated. The circulation path includes a supply channel, the pressure chamber, a collection channel, a circulation pump, and a pressure adjustment unit. The circulation pump is disposed at a position which is higher in the direction of gravity than a liquid inlet provided in a liquid channel extending from the liquid storage unit to the pressure adjustment unit and where the circulation pump is not in contact with the inlet.

Abstract: A liquid ejection head includes a pressure chamber communicating with an ejection port, an ejection element which ejects the liquid from the port, and a circulation path for the liquid including the chamber. The path includes a supply channel for supplying the liquid to the chamber, a collection channel for collecting the liquid from the chamber, a circulation pump which supplies the collected liquid to the supply channel, and a pressure adjustment unit configured to adjust a pressure on the liquid to be supplied to the supply channel. A pressure P21 on the liquid supplied to the chamber while the pump is stopped, a pressure P22 on the liquid supplied to the chamber while the pump is driven, and a pressure loss ?P from the adjustment unit to the chamber while the pump is driven satisfy P22>P21 and P22??P<0.

Abstract: A liquid ejection head includes a pressure chamber, an upstream channel, a downstream channel, a pump, an inflow channel, and a bypass channel. The upstream channel communicates with the pressure chamber to supply the liquid to the pressure chamber. The downstream channel communicates with the pressure chamber. The pump communicates with the upstream channel and the downstream channel to cause the liquid in the downstream channel to flow into the upstream channel. The inflow channel communicates with the upstream channel to cause the liquid to be supplied to the pressure chamber to flow into the upstream channel. The upstream channel and the downstream channel communicate with each other through the bypass channel without the pressure chamber being between the upstream channel and the downstream channel. Part of the liquid flowing from the upstream channel into the bypass channel flows into the pressure chamber through the downstream channel.

Abstract: A liquid ejection head includes: an ejection element configured to generate a pressure for ejecting the liquid; a supply channel through which the liquid is supplied to a pressure chamber; a collection channel connected to the supply channel through the pressure chamber and through which the liquid is collected from the pressure chamber; a circulation pump capable of supplying the liquid from the supply channel into the pressure chamber, and collecting the liquid in the pressure chamber through the collection channel and sending the liquid to the supply channel; a first pressure adjustment unit disposed between an outlet channel of the circulation pump and the supply channel and configured to adjust a pressure in the supply channel; and a second pressure adjustment unit disposed between an inlet channel of the circulation pump and the collection channel and configured to adjust a pressure in the collection channel.

Abstract: An ink cartridge adapter or ink cartridge includes a casing; and a plurality of pad electrodes mounted on the casing so as to be movable in a direction outwardly away from a side surface of the casing.

Abstract: A pressure control unit includes a liquid storage chamber, an inflow port that allows the liquid to flow therein, and an outflow port that allows the liquid to flow out thereof, the pressure control unit controlling pressure of the liquid, wherein at least part of an outer wall of the liquid storage chamber is formed of a flexible film, a pressing plate that presses the flexible film, an urging member that urges the pressing plate, and a valve that opens and closes the outflow port. The pressing plate moves in a direction of expanding the liquid storage chamber, whereby the valve in contact with the pressing plate moves and makes a valve opening degree of the outflow port high. A range of motion of the valve when making the valve opening degree of the outflow port high is limited by a member other than the pressing plate.

Abstract: A liquid ejection apparatus capable of suppressing the amount of liquid to discharge by recovery processing is provided. The liquid ejection apparatus includes: a first path fluidly connected to an ejection port unit and provided with a deformable region; and a second path fluidly connected to the first path via the ejection port unit and provided with a deformable region. Here, a flow of liquid is generated between the first path and the second path by a displacement unit.

Abstract: An ink cartridge adapter or ink cartridge includes a casing; and a plurality of pad electrodes mounted on the casing so as to be movable in a direction outwardly away from a side surface of the casing.

Abstract: A liquid refill container for refilling a liquid discharge apparatus with liquid includes a liquid storage portion, a pouring portion, and a cap portion. The liquid storage portion is made of a metal and contains liquid. The pouring portion is removeably connected to the liquid storage portion and has an outlet for pouring the liquid. The cap portion is removeably attached to the pouring portion and covers the outlet.

Abstract: An ink cartridge adapter or ink cartridge includes a casing; and a plurality of pad electrodes mounted on the casing so as to be movable in a direction outwardly away from a side surface of the casing.

Abstract: A liquid ejection head includes an ejection orifice for ejecting a liquid; a flow path in which an energy generating element is disposed, generates an energy to be used for ejecting the liquid; a liquid inside the flow path; an ejection orifice part that allows the ejection orifice and the flow path to communicate with each other; a supply flow path for supplying the liquid from the outside; and a recovery flow path for recovering the liquid to the outside. The moisture content of the liquid is 65 wt % or less. The liquid inside the flow path is circulated between the inside and the outside of the flow path.

Abstract: A liquid ejection head includes a nozzle including an ejection port for ejecting a liquid for performing recording on a recording medium, and a pressure chamber in which an energy generating element that generates energy used for ejecting the liquid from the ejection port is disposed; and a heating unit that heats the liquid. In the liquid ejection head, the liquid in the pressure chamber is circulated to and from the outside of the pressure chamber, and an average number of preliminary ejections per nozzle during an operation period in which the recording is performed is equal to or greater than 0 and equal to or less than 20.

Abstract: A liquid ejection apparatus capable of suppressing the amount of liquid to discharge by recovery processing is provided. The liquid ejection apparatus includes: a first path fluidly connected to an ejection port unit and provided with a deformable region; and a second path fluidly connected to the first path via the ejection port unit and provided with a deformable region. Here, a flow of liquid is generated between the first path and the second path by a displacement unit.

Abstract: A liquid discharge head includes a discharge port; a flow passage; a discharge port part; a supply flow passage; and a recovery flow passage. The flow passage, the supply flow passage, and the recovery flow passage are configured such that the liquid inside the flow passage is capable of being circulated between the inside of the flow passage and the outside of the flow passage. An opening of the discharge port is configured such that a liquid surface of the liquid within the opening of the discharge port has a first region and that a second region, and a viscosity of the liquid in the first region is 1.2 or more times higher than a viscosity of the liquid in the second region.

Abstract: A liquid ejection apparatus includes an ejection port ejecting a liquid, a pressure chamber storing the liquid, an element generating energy for ejecting the liquid in the pressure chamber, first and second tanks which can store the liquid, a flow passage establishing communication between the first and second tanks through the pressure chamber, a switching unit switching a flowing direction of the liquid in the flow passage between a first direction from the first tank to the second tank and a second direction being opposite to the first direction, and a pressure compensation unit. When a pressure in a downstream side flow passage portion downstream of the pressure chamber has a predetermined pressure or below, the pressure compensation unit compensates for reduction in pressure in the downstream side flow passage portion by supplying the liquid to the downstream side flow passage portion.