Abstract: A technology capable of efficiently dissipating heat in a printing element substrate with a temperature adjustment heating element mounted thereon is to be provided. A liquid ejection head substrate capable of ejecting liquid using energy generated by an energy generating element includes: a base; a first heat transfer layer configured to be installed below the energy generating element, and formed by being laminated on the base via an insulating layer; a temperature adjustment heating element configured to be capable of adjusting the temperatures of the liquid and the liquid ejection head substrate; and a first heat transfer member configured to connect the first heat transfer layer and the base, wherein the first heat transfer member is installed between adjacent ones of a plurality of the energy generating elements and between the energy generating element and the temperature adjustment heating element.

Abstract: Provided is a substrate for a liquid ejection head including: a heating element that generates an energy for ejecting a liquid; an electrode pad portion that has a wiring layer at a lower layer thereof, is electrically connected to the heating element through the wiring layer, and is electrically connected to an external component through a bonding material; and an insulating protection layer. The electrode pad portion further has a lower electrode layer and an upper electrode layer, the insulating protection layer disposed at a first region overlapping the wiring layer in a film thickness direction has a first opening through which the lower and upper electrode layers are connected, and the insulating protection layer disposed at a position including at least a second region overlapping the bonding material in the film thickness direction has a second opening through which the lower and upper electrode layers are connected.

Abstract: A liquid ejection head substrate includes a base layer, a heating resistance element provided over the base layer to generate a heat energy for ejecting a liquid, a first insulation layer covering the heating resistance element, and a protective layer having, on the first insulation layer, a first region which overlaps the heating resistance element via the first insulation layer and a second region which does not overlap the heating resistance element and formed of a material including a metal which is eluted by an electrochemical reaction. The liquid ejection head substrate further includes a second insulation layer provided over a region overlying the base layer and not provided with the protective layer and over the second region of the protective layer.

Abstract: One embodiment of the present invention is a liquid ejection apparatus having: a liquid ejection head including a heating element, a first protection layer that blocks contact between the heating element and liquid, a second protection layer that partially covers the first protection layer and functions as a first electrode, a second electrode that is electrically connected to the first electrode through the liquid, and an ejection port that ejects the liquid; and a control unit configured to perform control of setting a potential difference between the first electrode and the second electrode to a predetermined value in each of aging and printing by changing at least one of potentials of the first electrode and the second electrode, wherein ?Va??Vp is satisfied in the case where the potential difference in the aging is represented by ?Va and the potential difference in the printing is represented by ?Vp.

Abstract: A liquid discharge apparatus includes a liquid chamber, a liquid discharge unit including a heat-generating resistor, a first electrode that is provided in the liquid chamber, and a second electrode that is provided at a different position from the first electrode in the liquid chamber, a first voltage application unit, a second voltage application unit capable of applying voltage, and a control portion that controls the first voltage application unit and the second voltage application unit. The control portion performs a first operation which is voltage application between the first electrode and the second electrode by the second voltage application unit, and in which first voltage application where the first electrode is an anode and second voltage application where the first electrode is a cathode are alternatingly repeated, and a second operation in which the first voltage application unit applies voltage to the heat-generating resistor.

Abstract: The present disclosure aims to obtain stable ejection characteristics after performing removal of burnt-on deposits. An embodiment of the present invention is a liquid ejection apparatus including: a liquid ejection head having an ejection port from which to eject liquid, a thermal action unit having a heat generating element for generating energy required to eject the liquid, and a first protective layer provided to block a contact between the thermal action unit and the liquid and formed of a material containing metal that dissolves into the liquid by having an electrochemical reaction with the liquid; and a control unit configured to perform a cleaning process to remove burnt-on deposits accumulating on the first protective layer by dissolving the first protective layer through an electrochemical reaction and perform an aging process to accumulate burnt-on deposits onto the first protective layer after the cleaning process.

Abstract: A liquid ejection device has an element substrate having an ejection port; and a voltage application unit applying a voltage to the element substrate, wherein the element substrate has a first layer having the ejection port and a first channel communicating with the ejection port and a second layer fixed to a back face of the first layer and having a second channel communicating with the first channel, a heat element for ejecting the liquid, a first electrode covering a surface of the heat element on a side of the first layer and exposed to the first channel, and a second electrode exposed to the first channel at a position different from the first electrode and not overlapping the heat element on a plan view, and the voltage application unit is configured to apply the voltage so that the first electrode is at a negative potential.

Abstract: A liquid discharge apparatus is used that includes: a liquid discharge head having a discharge port, a liquid chamber that communicates with the discharge port, a heat generating resistor provided in the liquid chamber, and a first electrode and a second electrode provided in the liquid chamber; and a control unit that controls potential to the first electrode and the second electrode, on the basis of a potential control condition according to the type of the liquid. The first electrode is provided so as to overlap a position at which the heat generating resistor is provided, and the second electrode is provided so as not to overlap a position at which the first electrode is provided. The control unit modifies the potential control condition in accordance with changes in the composition of the liquid.

Abstract: A substrate includes a layer including a base material and an intermediate layer including a wiring layer, an element formed on a side of the intermediate layer, and configured to generate energy for discharging a liquid, an insulating layer covering the element and the layer against a liquid chamber, and a conductive layer formed on the insulating layer so as to cover the element against the liquid chamber. The substrate further includes an electric connecting portion configured to electrically connect the wiring layer and the element, a non-insulated portion formed on a side of the intermediate layer and configured to be covered by the insulating layer against the liquid chamber, and an opening portion formed in the insulating layer at a position. The non-insulated portion is connected to the conductive layer via the opening portion.

Abstract: A liquid ejection head includes a liquid ejection head substrate having ejection elements that generate liquid ejecting energy, an ejection port formation member having ejection ports, and liquid chambers between the liquid ejection head substrate and the ejection port formation member to house liquid to be ejected through the ejection ports. The liquid ejection head substrate includes a substrate, an insulating film stacked on the substrate to insulate the ejection elements, communication ports in the substrate and the insulating film to communicate with the liquid chambers, and a liquid-resistant insulating film adherent to the ejection port formation member. The liquid-resistant insulating film covers the insulating film at its ejection port formation member side and includes a first portion partially contacting the ejection port formation member and a second portion covering the inner surfaces of the communication ports in the insulating film, the first and second portions being continuous.

Abstract: An object is to provide a liquid ejection apparatus and a method of controlling a liquid ejection apparatus capable of preventing bubbles generated by kogation removal from interfering with the kogation removal. To this end, in a long liquid ejection head with a liquid circulated therethough, a pressure chamber is pressurized and a voltage is applied to a heat applying portion and an electrode to perform kogation removing cleaning.

Abstract: An element substrate of multi-layer structure, comprising an electrothermal transducing element formed in a first layer, a protective film covering the electrothermal transducing element, an anti-cavitation film formed on the protective film, a first electrical wire formed in the same layer as the anti-cavitation film, arranged to be separated from the electrothermal transducing element, and electrically connected to at least one end of the electrothermal transducing element, a second electrical wire on an opposite side, in relation to the electrothermal transducing element, to the protective film, and formed in a second layer, and a first connection member that extends between the first and second layers, and that electrically connects the first and second electrical wires.

Abstract: A liquid ejection head substrate includes a base layer, a heating resistance element provided over the base layer to generate a heat energy for ejecting a liquid, a first insulation layer covering the heating resistance element, and a protective layer having, on the first insulation layer, a first region which overlaps the heating resistance element via the first insulation layer and a second region which does not overlap the heating resistance element and formed of a material including a metal which is eluted by an electrochemical reaction. The liquid ejection head substrate further includes a second insulation layer provided over a region overlying the base layer and not provided with the protective layer and over the second region of the protective layer.

Abstract: One embodiment of the present invention is a liquid ejection apparatus having: a liquid ejection head including a heating element, a first protection layer that blocks contact between the heating element and liquid, a second protection layer that partially covers the first protection layer and functions as a first electrode, a second electrode that is electrically connected to the first electrode through the liquid, and an ejection port that ejects the liquid; and a control unit configured to perform control of setting a potential difference between the first electrode and the second electrode to a predetermined value in each of aging and printing by changing at least one of potentials of the first electrode and the second electrode, wherein ?Va??Vp is satisfied in the case where the potential difference in the aging is represented by ?Va and the potential difference in the printing is represented by ?Vp.

Abstract: A substrate includes a layer including a base material and an intermediate layer including a wiring layer, an element formed on a side of the intermediate layer, and configured to generate energy for discharging a liquid, an insulating layer covering the element and the layer against a liquid chamber, and a conductive layer formed on the insulating layer so as to cover the element against the liquid chamber. The substrate further includes an electric connecting portion configured to electrically connect the wiring layer and the element, a non-insulated portion formed on a side of the intermediate layer and configured to be covered by the insulating layer against the liquid chamber, and an opening portion formed in the insulating layer at a position. The non-insulated portion is connected to the conductive layer via the opening portion.

Abstract: An electrode pad portion of a liquid ejection head substrate includes a layer containing one of an iridium metal and an iridium alloy, and at least a portion of a cavitation resistant layer is provided in the same layer with the same material as the layer containing one of the iridium metal and the iridium alloy.

Abstract: A fluid ejection apparatus executes a cleaning process and an ejection operation of ejecting fluid from ejection ports while causing the fluid to flow from a supply port to a fluid collection port of a flow channel provided in a fluid ejection head. Moreover, the fluid ejection apparatus adjusts a flow rate of the fluid flowing in the flow channel to a first flow rate during the ejection operation and adjusts the flow rate of the fluid flowing in the flow channel to a second flow rate higher than the first flow rate at least during the cleaning process.

Abstract: An object is to provide a liquid ejection apparatus and a method of controlling a liquid ejection apparatus capable of preventing bubbles generated by kogation removal from interfering with the kogation removal. To this end, in a long liquid ejection head with a liquid circulated therethough, a pressure chamber is pressurized and a voltage is applied to a heat applying portion and an electrode to perform kogation removing cleaning.

Abstract: A liquid ejection head includes a liquid ejection head substrate having ejection elements that generate liquid ejecting energy, an ejection port formation member having ejection ports, and liquid chambers between the liquid ejection head substrate and the ejection port formation member to house liquid to be ejected through the ejection ports. The liquid ejection head substrate includes a substrate, an insulating film stacked on the substrate to insulate the ejection elements, communication ports in the substrate and the insulating film to communicate with the liquid chambers, and a liquid-resistant insulating film adherent to the ejection port formation member. The liquid-resistant insulating film covers the insulating film at its ejection port formation member side and includes a first portion partially contacting the ejection port formation member and a second portion covering the inner surfaces of the communication ports in the insulating film, the first and second portions being continuous.

Abstract: An element substrate of multi-layer structure, comprising an electrothermal transducing element formed in a first layer, a protective film covering the electrothermal transducing element, an anti-cavitation film formed on the protective film, a first electrical wire formed in the same layer as the anti-cavitation film, arranged to be separated from the electrothermal transducing element, and electrically connected to at least one end of the electrothermal transducing element, a second electrical wire on an opposite side, in relation to the electrothermal transducing element, to the protective film, and formed in a second layer, and a first connection member that extends between the first and second layers, and that electrically connects the first and second electrical wires.