Abstract: A liquid ejection head includes a housing having a first outer surface; a liquid ejection substrate disposed at a first portion of the first outer surface and having ejection ports for ejecting liquid; and a wiring member disposed on a second portion of the first outer surface so as to be next to the liquid ejection substrate and electrically connected to the liquid ejection substrate. The ejection ports are covered by a cap that is in contact with the wiring member and a portion, except the second portion, of the first outer surface around the liquid ejection substrate; and the second portion is recessed relative to the portion, except the second portion, of the first outer surface around the liquid ejection substrate.

Abstract: An inkjet print head is provided with a plurality of electrode terminals connected to a plurality of connecting terminals extending from electrical wiring members transmitting drive signals of elements generating energy for ejecting ink, and an insulating portion for insulating the extending portion of the connecting terminal to the connecting portion where the connecting terminal is connected to the electrode terminal from the print element substrate, the connecting portion being sealed by a sealant spreading due to a capillary force between the plurality of the connecting terminals. In order to prevent occurrence of the non-existence region of the sealant due to the blocking of the sealant by the insulating portion, the insulating portion is constructed of a plurality of separated convex portions in contact with the plurality of the connecting terminals respectively to form a groove between the convex portions for allowing the passing of the sealant.

Abstract: A liquid ejection recording head includes a recording element substrate including a plurality of energy generating elements for generating energy for ejecting liquid, and a flow passage-forming member, connected to the recording element substrate, comprising a plurality of ejection outlets corresponding to the plurality of energy generating elements and plurality of flow passages communicating with the ejection outlets. The flow passage-forming member includes a hole array having holes arranged so as to surround the flow passages and a communication passage, for establishing communication between adjacent holes, at a position close to the recording element substrate.

Abstract: A liquid ejection head includes a substrate having a supply port through which liquid is supplied and a plurality of energy generating elements provided along the supply port and generating energy for ejecting the liquid, a nozzle plate having nozzles provided therein in correspondence with the energy generating elements, and a channel provided between the substrate and the nozzle plate. The nozzle plate has a groove surrounding the channel. The groove includes a first groove provided in one surface of the nozzle plate at which the nozzle plate is bonded to the substrate, and a second groove provided in another surface of the nozzle plate in which the nozzles are provided. Edges of the first groove have sawtooth shape with a number of very small notches and edges of the second groove are substantially straight.

Abstract: A liquid ejection head includes a substrate including a liquid supply port and a plurality of ejection energy generating elements, disposed along the liquid supply port, and an ejection outlet plate including a plurality of ejection outlets, provided correspondingly to the plurality of ejection energy generating elements, and including a plurality of liquid flow passages, provided correspondingly to the plurality of ejection outlets, for establishing communication between the ejection outlets and the liquid supply port. The ejection outlet plate is provided with a hole portion formed to surround the liquid flow passages. The hole portion includes a plurality of first holes which are arranged in a line and which have opening edges having a shape without an acute angle and further includes a plurality of second holes having opening edges formed in a substantially sawtooth shape, with respect to a direction perpendicular to a surface of the ejection outlet plate.

Abstract: An ink jet recording head includes ejection resistors for generating thermal energy for ejecting ink; warming resistors for generating thermal energy for heating the ink; ejection outlets, provided correspondingly to the ejection resistors, for ejecting the ink; and a recording element substrate provided with ink flow paths provided correspondingly to and for supplying the ink to the ejection outlets, the ejection resistors, the warming resistors, a first ejection outlet array portion including the ejection outlets, and a second ejection outlet array portion including the ejection outlets. An amount of one ink droplet to be ejected from an ejection outlet of the first ejection outlet array portion is different from that from an ejection outlet of the second ejection outlet array portion.

Abstract: A liquid ejection head includes a housing having a first outer surface; a liquid ejection substrate disposed at a first portion of the first outer surface and having ejection ports for ejecting liquid; and a wiring member disposed on a second portion of the first outer surface so as to be next to the liquid ejection substrate and electrically connected to the liquid ejection substrate. The ejection ports are covered by a cap that is in contact with the wiring member and a portion, except the second portion, of the first outer surface around the liquid ejection substrate; and the second portion is recessed relative to the portion, except the second portion, of the first outer surface around the liquid ejection substrate.

Abstract: An inkjet print head is provided with a plurality of electrode terminals connected to a plurality of connecting terminals extending from electrical wiring members transmitting drive signals of elements generating energy for ejecting ink, and an insulating portion for insulating the extending portion of the connecting terminal to the connecting portion where the connecting terminal is connected to the electrode terminal from the print element substrate, the connecting portion being sealed by a sealant spreading due to a capillary force between the plurality of the connecting terminals. In order to prevent occurrence of the non-existence region of the sealant due to the blocking of the sealant by the insulating portion, the insulating portion is constructed of a plurality of separated convex portions in contact with the plurality of the connecting terminals respectively to form a groove between the convex portions for allowing the passing of the sealant.

Abstract: A liquid ejection recording head includes a recording element substrate including a plurality of energy generating elements for generating energy for ejecting liquid, and includes a flow passage-forming member, connected to the recording element substrate, comprising a plurality of ejection outlets corresponding to the plurality of energy generating elements and comprising a plurality of flow passages communicating with the ejection outlets. The flow passage-forming member includes a hole array consisting of holes arranged so as to surround the flow passages and includes a communication passage, for establishing communication between adjacent holes, at a position close to the recording element substrate.

Abstract: A liquid ejection head includes a substrate including a liquid supply port for supplying liquid and a plurality of ejection energy generating elements, disposed along the liquid supply port, for generating energy for ejecting liquid droplets; and an ejection outlet plate including a plurality of ejection outlets, provided correspondingly to the plurality of ejection energy generating elements, for ejecting the liquid and including a plurality of liquid flow passages, provided correspondingly to the plurality of ejection outlets, for establishing communication between the ejection outlets and the liquid supply port. The ejection outlet plate is provided with a hole portion formed so as to surround the liquid flow passages.

Abstract: A liquid ejection head includes a substrate having a supply port through which liquid is supplied and a plurality of energy generating elements provided along the supply port and generating energy for ejecting the liquid, a nozzle plate having nozzles provided therein in correspondence with the energy generating elements, and a channel provided between the substrate and the nozzle plate. The nozzle plate has a groove surrounding the channel. The groove includes a first groove provided in one surface of the nozzle plate at which the nozzle plate is bonded to the substrate, and a second groove provided in another surface of the nozzle plate in which the nozzles are provided. Edges of the first groove have sawtooth shape with a number of very small notches and edges of the second groove are substantially straight.

Abstract: When paper dirt that could not be removed completely by the wiping gets trapped in the recessed portions formed in the ejection port face, the paper dirt may interfere with ejection ports, giving rise to a possibility of image impairments. To deal with this problem, the ejection ports and the recessed portions in the print head are shifted from each other so that their positions are not aligned in the wiping direction.

Abstract: An ink jet recording head includes ejection resistors for generating thermal energy for ejecting ink; warming resistors for generating thermal energy for heating the ink; ejection outlets, provided correspondingly to the ejection resistors, for ejecting the ink; and a recording element substrate provided with ink flow paths provided correspondingly to and for supplying the ink to the ejection outlets, the ejection resistors, the warming resistors, a first ejection outlet array portion including the ejection outlets, and a second ejection outlet array portion including the ejection outlets. An amount of one ink droplet to be ejected from an ejection outlet of the first ejection outlet array portion is different from that from an ejection outlet of the second ejection outlet array portion.

Abstract: An ink jet recording head comprising an element base having a plurality of energy generating elements for generating energy used for discharging ink, a grooved top plate having a plurality of grooves corresponding to the plurality of energy generating elements, being joined to the element base, and having a plurality of ink flow channels formed by the plurality of grooves on a joint area side to the element base, an orifice plate having a plurality of orifices having communication with the plurality of ink flow channels respectively and being mounted on the grooved top plate integrally, and a chip tank having supply passages for supplying ink to the plurality of ink flow channels.

Abstract: An ink jet recording head in which a flat plate section has a recess section in its surface and an orifice plate having a plurality of openings grouped and disposed for ejecting a liquid is placed in the recess section, with the flat plate section being cleaned by a cleaning member movable perpendicularly to a direction of the disposition of the ejecting openings in a state brought into contact with a surface of the flat plate section. The recess section includes a combined curved surface made in a manner that a first curved surface having a first curvature and a second curved surface having a second curvature smaller than the first curvature are combined at a position corresponding to the deepest portion of the recess section. At this time, the first curved surface is located on the upstream side of the second curved surface in a cleaning direction of the cleaning member, and the combined curved surface extends in the disposition direction of said ejecting openings.

Abstract: According to the present invention, a liquid jet recording head assembly method comprises the steps of assembling a pressing member with a reference member to which an element substrate is fixed, charging a forcing spring provided for the pressing member to obtain a gap through which a grooved top plate can be inserted, assembling, by means of the gap, the grooved top plate with the element, and releasing the charging of the forcing spring and using the force exerted by the forcing spring to press the grooved top plate against the element substrate, so as to secure the grooved top plate to the element substrate.