Abstract: A manufacturing method of a liquid ejection unit includes: arranging an electric wiring board on a print element board such that the electric wiring board abuts the print element board, the print element board including an ejection port configured to eject liquid, an energy generating element configured to generate energy for ejecting the liquid from the ejection port, and an electrode pad electrically connected to the energy generating element, the electric wiring board including a terminal for electrical connection to the electrode pad; connecting the electrode pad and the terminal to each other by using an electric connection member; and covering an electric connection portion with a sealing agent, the electric connection portion including at least the electric connection member, the electrode pad, and the terminal, in which in the connecting, the electric connection member is shaped to include at least one bending point.

Abstract: A liquid ejection head includes a recording element substrate and an electric wiring substrate. The recording element substrate includes an ejection port configured to eject liquid, an energy generating element configured to generate energy for ejecting the liquid from the ejection port, and an electrode terminal that is electrically connected to the energy generating element. The electric wiring substrate is electrically connected to the electrode terminal by using wire bonding or the like. The electrode terminal is disposed on a connection surface of the recording element substrate, and a connection region in which electric connection to the electrode terminal is established is arranged at an end portion of the electric wiring substrate. The end portion of the electric wiring substrate is disposed above the surface of the recording element substrate on the connection surface side and is separated from the electrode terminal.

Abstract: A liquid ejection head including a recording element substrate that ejects a liquid, a flow passage member provided with a flow passage that supplies the liquid to the recording element substrate, an elastic member having elasticity disposed between the recording element substrate and the flow passage member, and a fixing member that fixes the recording element substrate and the flow passage member. In the liquid ejection head, an area between the recording element substrate and the flow passage member through which the liquid flows is sealed by having the elastic member be deformed with the fixing member.

Abstract: A liquid discharge head includes a recording element substrate. The recording element substrate includes a discharge aperture forming member defining a discharge aperture from which a liquid is discharged and a substrate having a pressure generating element that pressurizes the liquid so as to discharge the liquid. The liquid discharge head also includes a cover member that defines an opening through which the discharge aperture is exposed. The cover member is disposed on a side of the recording element substrate on which the discharge aperture is formed. In the liquid discharge head, the recording element substrate further includes an electrode disposed on a side of the substrate on which the discharge aperture forming member is formed and an insulation member that covers the electrode. In addition, the insulation member is covered by the cover member.

Abstract: A liquid ejection head including a recording element substrate that ejects a liquid, a flow passage member provided with a flow passage that supplies the liquid to the recording element substrate, an elastic member having elasticity disposed between the recording element substrate and the flow passage member, and a fixing member that fixes the recording element substrate and the flow passage member. In the liquid ejection head, an area between the recording element substrate and the flow passage member through which the liquid flows is sealed by having the elastic member be deformed with the fixing member.

Abstract: A liquid discharge head includes a recording element substrate. The recording element substrate includes a discharge aperture forming member defining a discharge aperture from which a liquid is discharged and a substrate having a pressure generating element that pressurizes the liquid so as to discharge the liquid. The liquid discharge head also includes a cover member that defines an opening through which the discharge aperture is exposed. The cover member is disposed on a side of the recording element substrate on which the discharge aperture is formed. In the liquid discharge head, the recording element substrate further includes an electrode disposed on a side of the substrate on which the discharge aperture forming member is formed and an insulation member that covers the electrode. In addition, the insulation member is covered by the cover member.

Abstract: A liquid ejection head has a plurality of ejection modules having a recording element substrate equipped with a plurality of ejection orifices for ejecting a liquid, a plurality of first flow path members that supports at least one of the ejection modules and a second flow path member provided in common with the first flow path members and supporting the first flow path members. The first flow path members and the second flow path member are equipped with a flow path for supplying a plurality of recording element substrates with a liquid. The first flow path members are joined with the second flow path member via an adhesive layer without being brought into direct contact with the second flow path member.

Abstract: In order that the interior of a cap member, in a case where the cap member abuts to a cover member, is allowed to have improved airtightness so that the cap member can sufficiently function, a sealing member is used to seal between the cover member and first and second flow path members for retaining the cover member.

Abstract: In a printing apparatus including a circulation system circulating a liquid, a volatile component included in the liquid evaporates from an ejection opening and thus characteristics of the liquid involving with concentration or viscosity change. The invention provides a printing apparatus that uses a liquid ejection head including an ejection opening ejecting a liquid, a print element generating energy for ejecting a liquid, and a pressure chamber having the print element provided therein, the printing apparatus including: a circulator configured to circulate the liquid so that the liquid passes through the pressure chamber; and a concentration adjustment unit configured to adjust a concentration of a liquid inside a liquid circulation system by discharging the liquid from the inside of the liquid circulation system and replenishing the liquid into the liquid circulation system from the outside of the liquid circulation system in response to the amount of the discharged liquid.

Abstract: A liquid discharge device performs 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: 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 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 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 has a plurality of ejection modules having a recording element substrate equipped with a plurality of ejection orifices for ejecting a liquid, a plurality of first flow path members that supports at least one of the ejection modules and a second flow path member provided in common to the first flow path members and supporting the first flow path members. The first flow path members and the second flow path member are equipped with a flow path for supplying a plurality of recording element substrates with a liquid. The first flow path members are joined with the second flow path member via an adhesive layer without being brought into direct contact with each other.

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: In a printing apparatus including a circulation system circulating a liquid, a volatile component included in the liquid evaporates from an ejection opening and thus characteristics of the liquid involving with concentration or viscosity change. The invention provides a printing apparatus that uses a liquid ejection head including an ejection opening ejecting a liquid, a print element generating energy for ejecting a liquid, and a pressure chamber having the print element provided therein, the printing apparatus including: a circulator configured to circulate the liquid so that the liquid passes through the pressure chamber; and a concentration adjustment unit configured to adjust a concentration of a liquid inside a liquid circulation system by discharging the liquid from the inside of the liquid circulation system and replenishing the liquid into the liquid circulation system from the outside of the liquid circulation system in response to the amount of the discharged liquid.

Abstract: A liquid discharge head includes: a plurality of recording element boards each having a plurality each of discharge orifices configured to discharge liquid, liquid supply channels configured to supply liquid to the discharge orifices, and liquid recovery channels configured to recover liquid supplied from the liquid supply channels; a common supply channel communicating with at least one liquid supply channel of the recording element boards and configured to supply liquid to the plurality of recording element boards; and a common recovery channel communicating with at least one liquid recovery channel of the recording element boards and configured to recover liquid from the plurality of recording element boards.

Abstract: A liquid ejection head capable of suppressing a change in pressure of a pressure chamber, a liquid ejection apparatus, and a manufacturing method are provided. For that reason, a lid member is formed on a wafer-shaped element board and the element board is cut into chips to manufacture a print element board.

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: 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.