Abstract: Provided is a liquid ejection head that makes it possible to achieve both of the stability of bonding and the shortening of a bonding time when bonding an electrical wiring substrate where thick leads applied with large current and thin leads applied with small current are mixed and a printing element substrate. For this purpose, the electrical wiring substrate includes wiring lines having different widths, and each of the wiring lines of the electric wiring substrate and a connecting terminal of the printing element substrate are connected by inner leads whose number corresponds to width of the wiring line.

Abstract: A liquid ejection head includes a liquid ejection section including an element substrate having ejection ports for ejecting liquid and an electrical wiring substrate connected to a contact of the liquid ejection apparatus to transmit signals to the element substrate, a liquid tank loading section including a containing space for containing a liquid tank storing liquid to be supplied to the element substrate and a lock member having an engaging part for engaging with a holding part of the liquid tank and a fixation means for rigidly securing the liquid election section and the liquid tank loading section in position.

Abstract: A liquid ejection apparatus includes a liquid supply member having a plurality of liquid supply passages, a connecting surface having a plurality of connecting portions connected to the liquid supply passages, a first positioning portion configured to determine relative positions between the liquid supply passages and the connecting portions in one direction along the connecting surface, and a second positioning portion configured to determine relative positions between the liquid supply passages and the connecting portions in the one direction and an other direction perpendicular to the one direction. A first distance between centers of gravity of the first positioning portion and the connecting portion farthest from the first positioning portion is longer than a second distance between centers of gravity of the second positioning portion and the connecting portion farthest from the second positioning portion.

Abstract: In the case where a slit is provided in a projection portion of an outlet plate, patterning property of a slit can be improved, and a desired slit can be formed. The present invention is a manufacturing method of a liquid ejection head including a substrate; an ejection outlet plate; a channel; and the supply ports formed between the substrate and the ejection outlet plate by joining of the ejection outlet plate onto the substrate; and a projection portion having a slit at a position facing the supply port of the ejection outlet plate, the method including the steps of: forming a first member on the substrate; forming a mold material for forming the slit between first member on the substrate; forming a second member serving as the ejection outlet plate on the mold material; forming the projection portion by removing the mold material.

Abstract: A liquid ejection head includes a liquid ejection substrate having an ejection port surface, a support substrate for supporting the liquid ejection substrate, having two first positioning portions being in contact with an attaching portion, to which the liquid ejection head is attached, to determine the position of the liquid ejection head with respect to the attaching portion in a predetermined direction, and a housing for supporting the support substrate, having a second positioning portion being in contact with the attaching portion to determine the position of the liquid ejection head with respect to the attaching portion in the predetermined direction. A surface perpendicular to the ejection port surface and extending along the predetermined direction, having the second positioning portion, is disposed between two surfaces perpendicular to the ejection port surface and extending along the predetermined direction, each having one of the first positioning portions.

Abstract: A liquid ejection head includes a head body configured to eject liquid, a holding portion rotatable with respect to the head body about a rotation shaft provided on the head body and configured to support the head body, and a rotation regulation portion configured to regulate the rotation of the holding portion with respect to the head body beyond an arrangement in which the holding portion, the rotation shaft, and a center of gravity of the head body aligned in a line in a direction of gravity with the head body held by the holding portion.

Abstract: In the case where a slit is provided in a projection portion of an outlet plate, patterning property of a slit can be improved, and a desired slit can be formed. The present invention is a manufacturing method of a liquid ejection head including a substrate; an ejection outlet plate; a channel; and the supply ports formed between the substrate and the ejection outlet plate by joining of the ejection outlet plate onto the substrate; and a projection portion having a slit at a position facing the supply port of the ejection outlet plate, the method including the steps of: forming a first member on the substrate; forming a mold material for forming the slit between first member on the substrate; forming a second member serving as the ejection outlet plate on the mold material; forming the projection portion by removing the mold material.

Abstract: The invention stabilizes a posture of a liquid discharge head when mounting the liquid discharge head with respect to a mount section of a liquid discharge apparatus and improves the mountability thereof. The liquid discharge head includes a grasp portion provided with a surface extending along a first direction as a direction of disposition of a plurality of discharge ports and extending along a second direction intersecting the discharge port surface and used for grasping the liquid discharge head. The surface of the grasp portion is provided at a position not overlapped in the direction vertical to the discharge port surface with a center axis passing in a third direction which is vertical to the first direction and extending along the discharge port surface through the center of gravity of the liquid discharge head in the first direction.

Abstract: A liquid supply member for supplying a liquid to a liquid discharge head having a discharge port which discharges a liquid, includes: a first member consisting of a resin material; a second member consisting of a resin material; and a supply path formed by joining the first member and the second member to each other, the supplying path supplying a liquid to the liquid discharge head, wherein at least a part of an internal surface of the supply path is a smooth surface smoothed by melting the resin after being molded.

Abstract: A recording head includes a plurality of nozzle arrays separately provided so as to correspond to kinds of recording liquids to be discharged, a plurality of common liquid chambers from which the recording liquids are supplied to the nozzle arrays, a plurality of recording-liquid introducing passages communicating with the common liquid chambers, and a plurality of filters provided in the recording-liquid introducing passages. Upstream aperture areas of the filters are equal to each other, and downstream aperture areas of the filters are different according to the kinds of recording liquids passing through the filters.

Abstract: A liquid discharge head that is detachably attached to a recording apparatus includes a liquid discharge substrate, a planar region including a plurality of connection terminals that electrically connect the liquid discharge head to the recording apparatus by sliding relative to the recording apparatus while turning when mounted on the recording apparatus, and definition portions defining a rotational center. The planar region is disposed parallel to the rotational center. Among the plurality of connection terminals, the connection terminal disposed closer to the rotational center is longer in a direction perpendicular to the rotational center and parallel to the planar region than the connection terminal disposed more distant from the rotational center.

Abstract: An inkjet printing apparatus is provided which can print images with no print quality variations. For this purpose, the fluid viscosity resistances between the print head and the print medium beneath respective nozzle arrays that occur as the print head moves in the forward direction are made equal to those that occur as the print head moves in the backward direction.

Abstract: A liquid-ejecting head includes a recording element substrate that includes an energy generating element generating energy for ejecting a liquid from a discharge port, a supporting member that supports the recording element substrate and has a liquid chamber supplying the liquid to the recording element substrate, a first supply port formed in one surface thereof, communicating with the liquid chamber, and having fluid communication with the recording element substrate, a second supply port being smaller than the first supply port, formed in a surface opposite the one surface at a position corresponding to a longitudinal end side of the first supply port, and communicating with the liquid chamber, and a flow passage forming member that supplies the liquid to the second supply port. The cross-section of the liquid chamber in a direction extending from the opposite toward one surfaces gradually increases in part of the extending direction.

Abstract: There is provided a method for manufacturing a liquid discharge head that includes a discharge port, a supply path for supplying the liquid to the discharge port, a transparent member, and an absorptive member, wherein the transparent member and the absorptive member include supply path sections that become a part of a wall of the supply path. The method includes bringing the transparent and absorptive member into contact with each other in such a manner that surfaces of both members including the supply path sections are brought into contact with each other in the vicinity of the supply path sections, welding the both members by irradiating the contact portion where the both members are in contact with each other with the laser beam, and exhausting gas from an exhaust path formed on the liquid discharge head in the vicinity of the contact portion at least throughout the welding process.

Abstract: A recording apparatus for performing recording by reciprocally moving a liquid discharge head includes the liquid discharge head, which includes a case, a connection terminal group including a plurality of connection terminals capable of electrically connecting to the recording apparatus and which is provided on one face of the case, a liquid discharge substrate for discharging a liquid from a discharge port according to a signal transmitted from the recording apparatus via the connection terminals, and a supporting substrate supporting the liquid discharge substrate, which is provided on another one face of the case.

Abstract: A liquid ejection apparatus includes a liquid supply member having a plurality of liquid supply passages, a connecting surface having a plurality of connecting portions connected to the liquid supply passages, a first positioning portion configured to determine relative positions between the liquid supply passages and the connecting portions in one direction along the connecting surface, and a second positioning portion configured to determine relative positions between the liquid supply passages and the connecting portions in the one direction and an other direction perpendicular to the one direction. A first distance between centers of gravity of the first positioning portion and the connecting portion farthest from the first positioning portion is longer than a second distance between centers of gravity of the second positioning portion and the connecting portion farthest from the second positioning portion.

Abstract: A liquid-ejecting head includes a recording element substrate that includes an energy generating element generating energy for ejecting a liquid from a discharge port, a supporting member that supports the recording element substrate and has a liquid chamber supplying the liquid to the recording element substrate, a first supply port formed in one surface thereof, communicating with the liquid chamber, and having fluid communication with the recording element substrate, a second supply port being smaller than the first supply port, formed in a surface opposite the one surface at a position corresponding to a longitudinal end side of the first supply port, and communicating with the liquid chamber, and a flow passage forming member that supplies the liquid to the second supply port. The cross-section of the liquid chamber in a direction extending from the opposite toward one surfaces gradually increases in part of the extending direction.

Abstract: A liquid ejection head includes a liquid ejection substrate having an ejection port surface, a support substrate for supporting the liquid ejection substrate, having two first positioning portions being in contact with an attaching portion, to which the liquid ejection head is attached, to determine the position of the liquid ejection head with respect to the attaching portion in a predetermined direction, and a housing for supporting the support substrate, having a second positioning portion being in contact with the attaching portion to determine the position of the liquid ejection head with respect to the attaching portion in the predetermined direction. A surface perpendicular to the ejection port surface and extending along the predetermined direction, having the second positioning portion, is disposed between two surfaces perpendicular to the ejection port surface and extending along the predetermined direction, each having one of the first positioning portions.

Abstract: A liquid ejection head includes a head body configured to eject liquid, a holding portion rotatable with respect to the head body about a rotation shaft provided on the head body and configured to support the head body, and a rotation regulation portion configured to regulate the rotation of the holding portion with respect to the head body beyond an arrangement in which the holding portion, the rotation shaft, and a center of gravity of the head body aligned in a line in a direction of gravity with the head body held by the holding portion.

Abstract: An ink jet recording head includes an element substrate; a plurality of ejection outlets, provided on the element substrate, for ejecting ink in a direction perpendicular to the element substrate; and a nozzle formation member having a plurality of ink flow paths which are in fluid communication with the ejection outlets, respectively. The ink flow paths are arranged at a density higher than 1200 dpi in an arranging direction of the ejection outlets and widths of flow passage walls forming the ink flow paths are smaller than heights of the ink flow paths and are smaller than widths of the ink flow paths.