Abstract: A liquid discharge head includes a print element substrate provided with a plurality of energy generation elements configured to apply energy for discharging a liquid, a discharge port forming member provided with a plurality of discharge ports which face the energy generation elements and are configured to discharge the liquid, and a plurality of first partitions which extend between the print element substrate and the discharge port forming member, and are configured to partition pressure chambers including the energy generation elements.

Abstract: A liquid ejection method includes ejecting liquid from an ejection opening, using a liquid ejection head including a heating surface configured to heat the liquid and the ejection opening corresponding to the heating surface, by heating the liquid with the heating surface to produce a bubble communicating with air through the ejection opening such that at least a part of the heating surface is exposed to the air through the ejection opening, wherein the liquid is heated with the heating surface for 0.5 microseconds or shorter to produce a bubble communicating with the air through the ejection opening such that at least a part of the heating surface is exposed to the air through the ejection opening, in order to eject the liquid from the ejection opening.

Abstract: An ink jet recording method is provided for recording an image by ejecting an ink from a recording head including a member defining an ejection orifice through which the ink is ejected, an ejection element configured to generate an energy used for ejecting the ink, and a first flow path communicating with a portion between the ejection orifice and the ejection element. The method includes ejecting an ink through the ejection orifice, and moving the ink from the first flow path to the portion between the ejection orifice and the ejection element separately from the ejecting of the ink. In this method, the ink is an aqueous ink containing a coloring material and a compound containing a chain hydrocarbon having a carbon number of 8 or more to 18 or less substituted by a hydroxy group or an anionic group.

Abstract: An object is to provide a liquid ejection apparatus that allows suppression of a fluctuation in a pressure of a liquid in a flow path caused by a liquid delivery unit, enabling the liquid to be stably ejected through an ejection port. The liquid ejection apparatus including a liquid ejection head having an ejection port through which a liquid is ejected, a flow path configured to communicate with the ejection port, and a liquid delivery unit configured to feed the liquid to the flow path. A relation between an angular frequency ? of the liquid delivered from the liquid delivery unit, a coefficient of kinematic viscosity ? of the liquid, and an equal diameter a of at least a part of a section of an extra-head flow path in a direction normal to a direction in which ink flows satisfies ?(?/2?)×a>1.

Abstract: A printing element substrate includes a substrate, an energy generating element, and an ejection-port formed member. The energy generating element is disposed on one surface of the substrate and configured to generate energy for use in ejecting liquid. The ejection-port formed member includes ejection ports that eject the liquid. A protrusion protruding toward inside of each of the ejection ports is provided on an inner surface of the ejection port. In a surface of the ejection-port formed member remote from the substrate, a tip portion of the protrusion is positioned closer to the substrate than an outer periphery of the ejection port.

Abstract: A liquid ejection head substrate includes a heating resistor array including a plurality of heating resistors and a protective film covering at least one of the heating resistors. The liquid ejection head substrate further includes a supply opening array and an electrode. The supply opening array is disposed on a side of a surface of the liquid ejection head substrate on which the protective film is provided. The supply opening array includes a plurality of supply openings through which a liquid is supplied arranged in a direction along the heating resistor array. The electrode is disposed on the side of the surface in a space between the supply openings adjacent to each other in a direction along the supply opening array. The electrode is configured such that a voltage is applied between the electrode and the protective film.

Abstract: A print element substrate and a liquid ejection head capable of suppressing degradation of a print quality caused by a white stripe/black stripe etc., is actualized without using a high degree of microfabrication technology. As a result of asymmetric deformation by swelling in a direction of relative movement to a print medium, print elements having different liquid droplet ejection directions are made to coexist and arrayed for that purpose.

Abstract: A liquid ejection head includes a plurality of liquid chambers each including an energy generating element that generates energy for ejecting a liquid, an ejection opening that ejects the liquid, and a liquid supply opening that supplies the liquid, the liquid flowing in a first direction in the plurality of liquid chambers, and the plurality of liquid chambers being arranged in a second direction that intersects the first direction, and a plurality of first side walls that extend in the first direction and that form walls on both sides of the plurality of liquid chambers. In the liquid ejection head, each of the plurality of first side walls includes a fragmenting portion that fragments each of the plurality of first side walls in the first direction.

Abstract: A recording element substrate includes: a substrate on which a plurality of energy generating elements that generate energy used for ejecting liquid are arranged side by side, an ejection port forming member in which ejection ports are formed at positions corresponding to the plurality of energy generating elements, a plurality of supply passages which are channels extending in a thickness direction of the substrate and through which liquid is supplied to the energy generating elements, and a support member that is formed between the substrate and the ejection port forming member and supports the ejection port forming member, in which supply ports that are apertures of the plurality of supply passages are linearly arranged side by side on the substrate, and a plurality of support members are provided side by side between adjacent supply ports on the substrate in a direction in which the supply ports are aligned.

Abstract: A liquid ejection head substrate includes a heating resistor array including a plurality of heating resistors and a protective film covering at least one of the heating resistors. The liquid ejection head substrate further includes a supply opening array and an electrode. The supply opening array is disposed on a side of a surface of the liquid ejection head substrate on which the protective film is provided. The supply opening array includes a plurality of supply openings through which a liquid is supplied arranged in a direction along the heating resistor array. The electrode is disposed on the side of the surface in a space between the supply openings adjacent to each other in a direction along the supply opening array. The electrode is configured such that a voltage is applied between the electrode and the protective film.

Abstract: Provided is an inkjet print head capable of favorably cleaning an ejection port surface and also of improving landing accuracy of ejected ink onto a print medium. For that purpose, a conductive layer formed of a conductive material is formed on a support substrate, flattening processing is executed, and a liquid ejection substrate is mounted on the support substrate with good positional accuracy without protrusion of a sealant for protecting an electric connection portion of the liquid ejection substrate from the ejection port surface.

Abstract: A liquid ejection head having at least one energy generation element for generating heat to be used for ejecting a liquid includes an insulating layer which is provided in contact with a substrate and supports the energy generation element; at least one heat transmitting layer which is composed of a material having a higher thermal conductivity than that of a material of the insulating layer and which is provided, in the insulating layer, between the energy generation element and the substrate; and a heat transmitting member which thermally connects the at least one heat transmitting layer and the substrate, wherein the heat transmitting member is connected to an area, on the heat transmitting layer, excluding an area directly below the energy generation element in a position interposed between the energy generation element and the substrate.

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: Multiple recording elements are disposed on one face of a recording element board, and a groove-shaped liquid supply channel is provided on the other face in common for the recording elements. Multiple supply ports passing through the recording element board and communicating the liquid supply channel with pressure chambers, and supply-side openings serving as supply ports of liquid to the liquid supply channel are further provided. When discharging liquid, the sum of pressure drop of the liquid from any supply-side opening to the supply port at a position farthest removed from that supply-side opening, and the pressure drop of the liquid at the supply port, is 5000 Pa or less.

Abstract: A liquid ejection module and a liquid ejection head capable of suppressing unevenness in printing are provided. Accordingly, openings are disposed so that a center position of at least one of openings in a plurality of ejection opening rows is not disposed on the same line extending in a print medium movement direction in a relative movement with respect to center positions of the other openings.

Abstract: A liquid discharge head includes a recording element configured to generate thermal energy and a discharge orifice disposed at a position facing the recording element. A bubble is generated in liquid by the thermal energy, liquid between the bubble and the discharge orifice is discharged from the discharge orifice by the pressure of the generated bubble, and the bubble communicates with the atmosphere on the outside of the discharge orifice.

Abstract: A liquid discharge apparatus has a liquid discharge head having a recording element board that includes a plurality of discharge orifices configured to discharge liquid, a plurality of pressure chambers internally provided with a recording element configured to generate energy used to discharge liquid, the plurality of pressure chambers each communicating with the plurality of discharge orifices via discharge channels, a liquid supply channel configured to supply liquid to the plurality of pressure chambers, and a liquid recovery channel configured to recover liquid from the plurality of pressure chambers, and a tank configured to store liquid supplied to the liquid discharge head. The plurality of pressure chambers communicate between the liquid supply channel and the liquid recovery channel so that liquid flows through the plurality of pressure chambers, and the specific permittivity ?r of the liquid stored in the tank satisfies the relationship of ?r?65.

Abstract: A recording element board includes a discharge orifice configured to discharge liquid, a pressure chamber communicating with the discharge orifice, a recording element configured to generate thermal energy to cause bubbling of the liquid, the recording element being disposed in the pressure chamber facing the discharge orifice, and a substrate on which the recording element is formed. When the recording element is driven and the liquid of within the pressure chamber is discharged, a generated bubble communicates with the atmosphere. A discharge orifice projection region where the discharge orifice has been projected on the substrate includes a region includes a region extending beyond a heat-generating region projection region where the heat-generating region of the recording element has been projected on the substrate, the outline of the discharge orifice projection region is circumscribed by the outline of the heat-generating region projection region.

Abstract: A liquid discharge head includes: a substrate, where a recording element is disposed; and a discharge orifice forming member, where a discharge orifice, facing the recording element, and configured to discharge the liquid, is formed. The liquid discharge head has a pressure chamber, a first liquid channel configured to supply liquid to the pressure chamber, and a second liquid channel configured to recover liquid from the pressure chamber. The substrate has a liquid supply channel connected to the first liquid channel to supply liquid to the first liquid channel, and a liquid recovery channel connected to the second liquid channel, to recover liquid from the second liquid channel. Pressure at an inlet portion of the liquid supply channel is higher than pressure at an outlet portion of the liquid recovery channel, and a flow velocity of liquid within the pressure chamber is 3 to 140 mm/s.

Abstract: A liquid is reliably supplied to a liquid ejection head through a plurality of supply paths. The liquid is supplied to a plurality of areas of the liquid ejection head through the plurality of supply paths and a liquid ejection amount per unit time from the liquid ejection head is controlled so that a liquid flow amount of each of the areas becomes a predetermined flow amount or less.