Abstract: Provided is a liquid ejection head, including: an ejection orifice forming member having an ejection orifice for ejecting liquid; a substrate having a supply port for supplying the liquid to the ejection orifice; and a filter disposed at a position upstream of the ejection orifice when the liquid is supplied to the ejection orifice, in which the filter includes an opening having a diameter smaller than or equal to a diameter of the ejection orifice, and a tapered shape structure disposed at a position upstream of the opening when the liquid is supplied to the ejection orifice, the tapered shape structure having a distal end directed toward an upstream side.

Abstract: A liquid ejection head includes a member having ejection ports and dummy ejection ports. The ejection ports are provided in correspondence with energy-generating elements used in ejecting liquid. The dummy ejection ports are provided in correspondence with a light-receiving element outputting current whose level changes in accordance with the intensity of light applied thereto. By detecting the level of current that is output from the light-receiving element, the shapes of the ejection ports are estimated.

Abstract: An ink jet recording head includes a coating resin layer including a plurality of ejection outlets for ejecting ink and a plurality of ink flow passages communicating with the plurality of ejection outlets; a substrate provided with an energy generating element for generating energy for ejecting the ink; and an adhesiveness-improving layer, provided between the coating resin layer and the substrate, for improving adhesiveness between the coating resin layer and the substrate. The adhesiveness-improving layer has a thickness so as to be larger at an end portion of the substrate than that at a portion other than the end portion.

Abstract: The opening area and shape of ejection orifices provided in an ejection orifice member influence the amount of liquid droplet. Therefore, it is necessary to check the opening area and shape of the ejection orifices in detail. For this purpose, in a liquid ejection head having ejection orifices used for ejecting liquid using energy generated by energy generating elements and a dummy ejection orifice having the same shape as the ejection orifices and not used for ejection of liquid, an examination member is provided at a position facing the dummy ejection orifice.

Abstract: An ink discharge head includes a coating resin layer having a plurality of discharge ports for discharging ink, and ink flow passages which communicate with the plurality of discharge ports, respectively; and a substrate having energy generation elements which generate the energy for discharging ink and provided with the coating resin layer. A crack inducing portion for relieving the stress produced at the interface between the coating resin layer and the substrate is formed at lateral faces of the outer peripheral edge of the coating resin layer.

Abstract: When an insulating layer is provided in order to protect an energy generating element, there arises a possibility that the layer dissolves in a contacting liquid. Therefore, in order to eject liquid, a first protection layer containing metal is provided on the insulating layer facing a substrate for a liquid-ejection head and a second protection layer containing metal is provided on the surface of a liquid supply port to which a base containing silicon is exposed.

Abstract: A liquid ejecting head including a liquid ejecting port for ejecting a liquid and nozzle layer having a liquid channel communicating with the liquid ejecting port, wherein the nozzle layer has two layers, and a first layer which is a layer at the side of the liquid channel among the two layers has a resin film-formed with an acid and has a smaller static contact angle of water as compared with a second layer which is the other layer.

Abstract: A method for manufacturing a liquid ejecting head including an orifice plate having an ejecting orifice and a liquid channel, and a substrate having a liquid ejecting energy generating element and a liquid supply port, the method including: (1) forming a liquid channel mold of a soluble resin dissolved in (6) on the substrate; (2) coating the liquid channel mold with a photosensitive resin layer having a refractive index of n at an exposure wavelength used in (4); (3) forming an antireflective film having a refractive index of ?n?0.2 or more to ?n+0.2 or less at the exposure wavelength used in (4) on the photosensitive resin layer; (4) exposing and developing the photosensitive resin layer and antireflective film to form the ejecting orifice; (5) forming the liquid supply port on the substrate; and (6) dissolving and removing the liquid channel mold from the liquid supply port.

Abstract: A liquid discharge head includes a substrate and a flow path wall member provided on the substrate and having a wall defining a flow path connected to a discharge port for discharging liquid. The flow path wall member is provided with a cavity not connected to the flow path, when viewed in a direction from the discharge port toward the substrate, the cavity has a shape of a character, and the character corresponds to information regarding the liquid discharge head.

Abstract: A method for manufacturing a liquid-ejection head having a plurality of nozzles arranged to eject liquid includes: preparing a substrate having a first layer, a second layer, and a third layer stacked in this order, the second layer more resistant than the third layer to etching by an etching method to be used on the third layer; partially etching the third layer by the etching method to expose the second layer; and removing the exposed second layer at least in part to expose some area on the top surface of the first layer, opening a first one of the nozzles down from the exposed area of the top surface, and opening a second one of the nozzles down from the top surface of the third layer.

Abstract: The present invention provides a method for producing a liquid discharge head including a silicon substrate having, on a first surface, energy generating elements, and a supply port penetrating the substrate from the first surface to a second surface, which is a rear surface of the first surface of the substrate. The method includes the steps of: preparing the silicon substrate having a sacrifice layer at a portion on the first surface where the ink supply port is to be formed and an etching mask layer having a plurality of openings on the second surface, the volume of a portion of the sacrifice layer at a position corresponding to a portion between two adjacent said openings being smaller than the volume of a portion of the sacrifice layer at a position corresponding to the opening; etching the silicon substrate from the plurality of openings and etching the sacrifice layer.

Abstract: A method for manufacturing a liquid discharge head including a flow path forming member to form a flow path communicating with a discharge port for discharging liquids includes forming an organic material layer on a substrate, applying a soluble resin on the organic material layer to form a resin layer, patterning the resin layer to form a pattern with a shape of the flow path, forming a cover layer as the flow path forming member on the pattern, forming the discharge port to expose a part of the pattern from the cover layer, eluting the pattern from the discharge port to form the flow path, irradiating a substance sticking to a surface of the flow path forming member on which the discharge port is formed with ultraviolet light, wherein the substance contains at least the organic material, and removing the sticking substance.

Abstract: There is disclosed a manufacturing method of a liquid discharge head including a substrate in which a first energy generating element and a second energy generating element that generate energy used for discharging liquid are provided, a discharge port member in which a first discharge port discharging the liquid is provided corresponding to the first energy generating element and a second discharge port discharging the liquid is provided corresponding to the second energy generating element, and a flow path wall member having a portion of the liquid flow path wall that communicates with the first discharge port and the second discharge port, in which a distance between the second energy generating element and the second discharge port is larger than that between the first energy generating element and the first discharge port.

Abstract: Provided is a liquid ejection head, including: an ejection orifice forming member having an ejection orifice for ejecting liquid; a substrate having a supply port for supplying the liquid to the ejection orifice; and a filter disposed at a position upstream of the ejection orifice when the liquid is supplied to the ejection orifice, in which the filter includes an opening having a diameter smaller than or equal to a diameter of the ejection orifice, and a tapered shape structure disposed at a position upstream of the opening when the liquid is supplied to the ejection orifice, the tapered shape structure having a distal end directed toward an upstream side.

Abstract: A liquid ejection head according to the present invention includes a heat-generating resistor layer, a first electrode layer, an insulating layer extending over the heat-generating resistive layers and the first electrode layer, and a second electrode layer that has a first portion which extending through the insulating layer and which is electrically connected to the first electrode layer and also has a second portion which is not in contact with the insulating layer. The second portion has a space or a piece of resin disposed between the insulating layer and the second electrode layer.

Abstract: Provided is a process for producing a liquid ejection head including an ejection orifice member having a plurality of ejection orifices for ejecting liquid provided along an arrangement direction, the process including preparing a substrate provided with a resin layer which contains a photocurable resin;carrying out a first exposure treatment and a second exposure treatment which are each of an exposure treatment of subjecting the resin layer to exposure; and forming the ejection orifices of the resin layer subjected to the first exposure treatment and the second exposure treatment. An inclination angle of a side wall of the ejection orifices formed by the first exposure treatment with respect to the substrate differs from an inclination angle of a side wall of the ejection orifices formed by the second exposure treatment with respect to the substrate.

Abstract: A liquid discharge head includes, a substrate, a flow path wall member provided with a wall of a liquid flow path connected to a discharge port for discharging liquid, the flow path being formed by the flow path wall member and one surface of the substrate which are in contact with each other, and a coated resin member made of a cured material of a resin composition provided to cover end surfaces of the substrate, wherein a liquid repellent member having a contact angle of the resin composition larger than that of both the flow path wall member and the one surface is provided to cover at least a part of an intersection line between an outer lateral surface of the flow path wall member and the one surface.

Abstract: An ink jet recording head capable of maintaining ink supply capability for a long period of time, including a substrate provided with a plurality of energy generating elements and an ink supply port, and a flow path member which has a plurality of discharge ports, a plurality of ink flow paths in communication with the plurality of discharge ports, and a common liquid chamber in communication with the plurality of ink flow paths, in which the common liquid chamber is divided into a discharge port area and a drainage port area, the ink flows into the discharge port area through a filter, and in the case where a smallest diameter among the diameters of the discharge ports and the diameters of the ink flow paths is denoted by A and a largest diameter of openings of the filter is denoted by B, A?B is satisfied.

Abstract: A liquid ejection head including a flow path forming member which forms an ejection orifice which is opened on a front surface and which ejects a liquid, and a liquid flow path which continues to the ejection orifice; and a substrate including a liquid chamber which is opened on a back surface on an opposite side of the front surface and which includes a first slope which becomes narrower from a back surface side toward a front surface side, a liquid pathway which is opened in the first slope and connects the liquid flow path and the liquid chamber, and a first hollow portion which is provided in a bottom portion of the liquid chamber.

Abstract: A manufacturing method of a liquid ejection head includes forming on a substrate a first flow passage wall forming member contacting a solid layer of equal height, exposing a first layer of a negative photosensitive resin material to form an ejection outlet forming member; exposing a second layer, on the first layer, of a negative photosensitive resin material to form a second flow passage wall forming member for forming another part of the wall of the flow passage; placing the exposed first and second layers on the solid layer and the first flow passage wall forming member so that a non-exposed portion of the second layer contacts the solid layer; forming parts of the flow passage and the ejection outlet by removing non-exposed portions of the first and second layers above the substrate; and forming the flow passage by removing the solid layer.