Abstract: A first passage layer is provided with a plurality of supply passages each communicating with one portion of each of a plurality of pressure chambers and a plurality of collection passages each communicating with the other portion of each of the plurality of pressure chambers. A second passage layer is provided with a common supply passage communicating with the plurality of supply passages and a common collection passage communicating with the plurality of collection passages.

Abstract: A liquid ejection head includes first and second recording element boards having recording elements for generating energy to be utilized for ejection of liquid, first and second support members for respectively supporting the first and second recording element boards, and a flow channel forming member carrying thereon the first and second support members arranged side by side. The edge of the first recording element board located at the side of the second recording element board projects toward the second recording element board from the edge of the first support member located at the side of the second support member.

Abstract: A liquid discharge head includes discharge orifices, recording elements that generate energy, supply channels that supply liquid to the recording elements, a common supply channel communicating with the supply channels, recovery channels that recover liquid supplied to the recording elements, a common recovery channel that recovers liquid from the recovery channels, a first inlet port that supplies liquid to the common supply channel, a first recovery port that recovers liquid from the first common supply channel, a second inlet port that supplies liquid to the common recovery channel, and a second recovery port that recovers liquid from the second common recovery channel. The first inlet port and the first recovery port communicate without going through channel portions where recording elements are disposed, and the second inlet port and the second recovery port communicate without going through channel portions where recording elements are disposed.

Abstract: A liquid ejection apparatus of the invention is a liquid ejection apparatus including a liquid storage container that stores liquid, a circulation mechanism that circulates liquid in a circulation path, and a liquid ejection head fluidly-connected to the liquid storage container, the liquid ejection head having a plurality of ejection openings, wherein the liquid ejection head includes at least a pair of common passages and a plurality of individual passages that connect one of the pair of common passages to the other one of the pair of common passages and communicate with the plurality of ejection openings, respectively, and at least a pair of pressure adjustment mechanisms whose pressures are set to different control pressures is connected to respective upstream sides or downstream sides of the pair of common passages.

Abstract: A first passage layer is provided with a plurality of supply passages each communicating with one portion of each of a plurality of pressure chambers and a plurality of collection passages each communicating with the other portion of each of the plurality of pressure chambers. A second passage layer is provided with a common supply passage communicating with the plurality of supply passages and a common collection passage communicating with the plurality of collection passages.

Abstract: Provided is a liquid ejection head comprising: an ejection opening row along a first direction; a pressure chamber with print-element; a passage communicating with the pressure chamber; a supply opening row along the first direction with supply openings extending in a second direction to supply liquid to the passage; a collection opening row along the first direction with collection openings extending in the second direction to collect a liquid from the passage; a first common supply passage along the first direction to supply a liquid to the supply opening row; a first common collection passage along the first direction to collect a liquid from the collection opening row; a first supply side communication opening extending in the second direction to supply a liquid to the first common supply passage; and a first collection side communication opening extending in the second direction to collect a liquid from the first common collection passage, wherein at least one of the first supply side communication openi

Abstract: A liquid discharge device to perform recording by use of a liquid discharge head including discharge ports to discharge a liquid, pressure generation elements to generate energy to be used to discharge the liquid, and pressure chambers communicating with the discharge ports. The liquid discharge device includes: a control unit to control a temperature of the liquid discharge head by applying heat with heating elements arranged in divided areas of a region of the liquid discharge head where the discharge ports are arranged. When there is recording data for the discharge port in a certain one of the divided areas, the control unit causes the heating element in the divided area to generate heat, and when there is no recording data for the discharge port in the certain divided area, the control unit keeps the heating element in the certain divided area from generating heat.

Abstract: A print element substrate and a printing device which can suppress lowering of an image quality are provided. For that purpose, a heater, a sub-heater, and a driver are arranged in each heating area, and a plurality of the heating areas is arrayed on the print element substrate.

Abstract: A liquid ejecting apparatus has a liquid ejecting unit and a negative pressure regulating unit provided between passages connecting the tank to the liquid ejecting unit, regulates fluid pressure of liquid flowing into the liquid ejecting unit. The negative pressure regulating unit includes a negative pressure chamber whose internal pressure is regulated within a predetermined range, and a discharging passage for discharging liquid stored in the negative pressure chamber from the negative pressure regulating unit. The discharging passage has an outlet disposed in an upper portion of the negative pressure chamber in a direction of gravity, a bubble accumulation portion connected to the outlet and having a space above the outlet in the direction of gravity, and a passage guiding liquid flowing from the outlet to a discharging port opened in a bottom of the negative pressure regulating unit.

Abstract: A liquid ejection head includes a support member extending in a first direction, a print element board having an ejection port through which liquid is ejected, and first and second members arranged in the support member adjacent to each other along the first direction, each having a supply path extending in the first direction. The print element board element generates energy used for ejection of the supply paths supplied liquid. The first member includes an outlet port through which the supplied liquid flows out. The second member includes an inlet port through which the liquid from the outlet port flows. The outlet port is provided near a first member supply path end portion on the support member side on which the second member is provided. The inlet port is provided near a second member supply path end portion on the support member side on which the first member is provided.

Abstract: A liquid discharge head including a first recording element substrate, a second recording element substrate, and a third recording element substrate successively arranged in a longer direction of the liquid discharge head, the first, second, and third recording element substrates each including a discharge port configured to discharge a liquid and an energy-generating element configured to generate energy used for discharging the liquid; a first support member supporting an end part of the first recording element substrate on a side of the second recording element substrate and an end part of the second recording element substrate on a side of the first recording element substrate; and a second support member supporting an end part of the second recording element substrate on a side of the third recording element substrate and an end part of the third recording element substrate on a side of the second recording element substrate.

Abstract: In order to keep possible local temperature differences in a liquid ejection head small to allow stable liquid ejection performance to be achieved, temperatures in a plurality of heating areas in a liquid ejection head are discretely controlled using heating elements and temperature detection elements.

Abstract: A method for manufacturing a liquid ejection head includes joining a support member to a print element substrate using another member to which the print element substrate is attached. The other member has a suction region to be held at the time of being attached to the support member.

Abstract: The liquid ejection apparatus includes a circulation unit configured to circulate a liquid along a circulation passage extending from a liquid supply source to the liquid supply source through a liquid ejection head. Further, the liquid ejection apparatus includes a deaeration unit configured to perform a deaeration operation of decreasing a dissolved gas amount of the liquid, a recovery unit configured to recover ejection performance of an ejection opening, and a control unit configured to control an operation of driving the circulation unit and the deaeration unit. The control unit starts the deaeration operation and circulates the liquid having been deaerated by the deaeration operation inside a circulation path after the recovery operation and before an initial printing operation after the recovery operation.

Abstract: In a liquid ejection head, it is possible to suppress generation of a temperature distribution of liquid in a direction in which ejection openings are arranged in a print element board. Specifically, a liquid ejection head, which is provided with an ejection opening row in which a plurality of ejection openings for ejecting a liquid are arranged, includes a pressure chamber that communicates with the ejection openings and includes a pressure generation element, a passage which is provided with an opening and extends along the ejection opening row to supply the liquid flowing into the passage through the opening to the pressure chamber, a heater provided around the opening, and a temperature sensor provided in a region along the ejection opening row.

Abstract: A liquid ejection head including: an ejection opening; a passage in which an energy generation element is disposed; an ejection opening portion that allows communication between the ejection opening and the passage; a supply passage for allowing the liquid to flow into the passage; and an outflow passage for allowing the liquid to flow out to the outside, wherein an expression of H?0.34×P?0.66×W>1.7 is satisfied when a height of the passage is set to H, a length of the ejection opening portion is set to P, and a length of the ejection opening portion is set to W.

Abstract: A liquid discharge head includes: a recording element board including a discharge orifice configured to discharge liquid, a recording element configured to generate energy to discharge liquid, a pressure chamber having the recording element within, a liquid supply channel configured to supply liquid to the pressure chamber, and a liquid recovery channel configured to recover liquid from the pressure chamber; and a support member configured to support the recording element board, the support member including a supply chamber configured to supply liquid to the liquid supply channel, and a recovery chamber configured to recover liquid from the liquid recovery channel. An inner volume of the recovery chamber is smaller than an inner volume of the supply chamber.

Abstract: A liquid discharge head includes discharge orifices, recording elements that generate energy, supply channels that supply liquid to the recording elements, a common supply channel communicating with the supply channels, recovery channels that recover liquid supplied to the recording elements, a common recovery channel that recovers liquid from the recovery channels, a first inlet port that supplies liquid to the common supply channel, a first recovery port that recovers liquid from the first common supply channel, a second inlet port that supplies liquid to the common recovery channel, and a second recovery port that recovers liquid from the second common recovery channel. The first inlet port and the first recovery port communicate without going through channel portions where recording elements are disposed, and the second inlet port and the second recovery port communicate without going through channel portions where recording elements are disposed.

Abstract: A liquid ejection apparatus using a liquid ejection head and ejecting a liquid from the liquid ejection head includes a liquid supply unit that has a supply passage of the liquid supplied to the liquid ejection head and a collection passage of the liquid collected from the liquid ejection head, and supplies and collects the liquid by generating a difference between a pressure of the liquid in the supply passage and a pressure of the liquid in the collection passage, and a flow resistance adjustment unit provided in the supply passage and/or the collection passage.

Abstract: A liquid discharge head includes a recording element board including multiple discharge orifices configured to discharge liquid, multiple pressure chambers that communicate with the multiple discharge orifices via discharge channels, and have therein recording elements configured to generate energy used to discharge liquid, a liquid supply channel configured to supply liquid to the multiple pressure chambers, and a liquid recovery channel configured to recover liquid from, the multiple pressure chambers. The multiple pressure chambers communicate with the liquid supply channel and the liquid recovery channel so that liquid flows through the multiple pressure chambers. The direction of flow of liquid in the multiple pressure chambers is the same direction.