Abstract: There is provided a method for stabilizing a refilling speed within a predetermined range even with various physical properties of liquid to be ejected in a liquid ejection head using a thermal system. To achieve this, a drive pulse is controlled for each nozzle array according to the combination of a predetermined material and structure of a bubble-generating chamber and the physical property of the liquid to be ejected such that an amount of an overshoot and the refilling speed are within a predetermined range.

Abstract: There are provided a liquid ejecting head, an ejecting element substrate and a liquid ejecting apparatus that can suppress degradation in print quality. Therefore in an ejecting element substrate arranged the closest to the center of a support member, a flow resistance of a flow passage corresponding to an ejection opening of an ejection opening array arranged the closest to the center of the ejecting element substrate is made high.

Abstract: A liquid ejection head includes a discharge orifice configured to eject liquid; a device configured to generate energy for use in ejecting liquid; a pressure chamber partitioned by a wall, the pressure chamber accommodating the device and communicating with the discharge orifice; and a channel configured to supply liquid to the pressure chamber, wherein the discharge orifice has first and second protrusions protruding from the edge of the discharge orifice toward the central portion in an extending direction of the channel along the center line of the channel, and the interval between the base of the first protrusion and the base of the second protrusion in the extending direction of the channel is larger than the maximum interval between the edges of the discharge orifice in a direction perpendicular to the extending direction.

Abstract: The print head includes an energy generating element, a chamber for accommodating liquid, and an ejection opening arranged in a position corresponding to the energy generating element. The ejection opening includes at least one projection projecting inside of the ejection opening, the ejection opening having a first region between a front end of the projection and an inner wall of the ejection opening positioned at the shortest distance from the front end, and second regions positioned on both sides of the projection and different from the first region, and when a width of the projection at a chamber-side opening face is represented as a1 and the maximum width of the projection is represented as a2, a relation a1<a2 is established and the width of the projection decreases gradually or step by step from a position having the width of a2 to the chamber-side opening face.

Abstract: A liquid ejection head including: a recording element substrate provided with an element; an electric wiring substrate having a bent portion, a connecting portion provided on one side of the bent portion and connected with the recording element substrate, and an input portion provided on the other side of the bent portion; and a housing having a first surface, a second surface, a depression provided on the second surface, and a member separated from a bottom surface of the depression and extending into an opening of the depression, wherein part of the other side of the electric wiring substrate is disposed between the bottom surface of the depression and the member.

Abstract: A liquid ejection head includes a discharge orifice configured to eject liquid; a device configured to generate energy for use in ejecting liquid; a pressure chamber partitioned by a wall, the pressure chamber accommodating the device and communicating with the discharge orifice; and a channel configured to supply liquid to the pressure chamber, wherein the discharge orifice has first and second protrusions protruding from the edge of the discharge orifice toward the central portion in an extending direction of the channel along the center line of the channel, and the interval between the base of the first protrusion and the base of the second protrusion in the extending direction of the channel is larger than the maximum interval between the edges of the discharge orifice in a direction perpendicular to the extending direction.

Abstract: A liquid ejection head includes a recording element substrate for ejecting liquid in response to an externally supplied electrical signal; an electrical wiring board having a first and second part mutually joined via a bent portion, the first part having an electrical joint portion for supplying the signal to the substrate, the second part having an electrical signal input portion into which the signal is input and to which the joint portion is connected; and a housing having first and second surfaces mutually adjoining, the first and second surfaces respectively supporting the first and second parts. The second part is fixed to the second surface at plural first fixing positions around the input portion. The second surface has a depressed portion formed closer to the bent portion than the first fixing positions. The second part is fixed to the housing at a second fixing position inside the depressed portion.

Abstract: A liquid ejection head including: a recording element substrate provided with an element; an electric wiring substrate having a bent portion, a connecting portion provided on one side of the bent portion and connected with the recording element substrate, and an input portion provided on the other side of the bent portion; and a housing having a first surface, a second surface, a depression provided on the second surface, and a member separated from a bottom surface of the depression and extending into an opening of the depression, wherein part of the other side of the electric wiring substrate is disposed between the bottom surface of the depression and the member.

Abstract: A liquid discharge head includes a substrate including an energy generating element that generates energy used to discharge liquid and a discharge port member having a discharge port surface with a discharge port line including discharge ports, through which the liquid is discharged, arrayed in a first direction. The discharge port surface includes a groove portion disposed between the discharge port line and a first end of the discharge port member in a second direction intersecting the first direction. The groove portion extends along the discharge port line. The discharge port surface further includes an inclined surface disposed between an end of the discharge port line and a second end of the discharge port member in the first direction. The inclined surface is inclined toward the second end.

Abstract: A liquid ejection head, including a recording element substrate for ejecting liquid in response to an externally supplied electrical signal; an electrical wiring board having a first and second part mutually joined via a bent portion, the first part having an electrical joint portion for supplying the signal to the substrate, the second part having an electrical signal input portion into which the signal is input and to which the joint portion is connected; and a housing having a first and second surface mutually adjoining, the first and second surfaces respectively supporting the first and second parts. The second part is fixed to the second surface at plural first fixing positions around the input portion. The second surface has a depressed portion formed closer to the bent portion than the first fixing positions. The second part is fixed to the housing at a second fixing position inside the depressed portion.

Abstract: There is provided an inkjet printing apparatus which can perform stable ejection also in successive printing at high speed even in a case of performing printing in use of a print head provided with an ejection opening surface having hydrophilic properties. The inkjet printing apparatus comprises an inkjet print head wherein the control unit controls the print head such that, in a case where the ejection number of the ink ejected from the print head after removing the ink on the ejection opening surface by the ink removal unit is equal to or more than a threshold, a drive energy amount that is supplied for the preliminary ejection operation is larger than a drive energy amount that is supplied for the preliminary ejection operation in a case where the ejection number is less than the threshold.

Abstract: An embodiment of this invention is directed to preventing a decrease in the number of media printable with ink in an ink tank owing to an increase in waste ink in aging processing, and an increase in aging processing time. According to the embodiment, aging processing is executed as follows in a printing apparatus in which a printhead including a plurality of nozzles and a nozzle array formed from these nozzles and discharge ink is reciprocally scanned in a direction different from the direction of the nozzle array, and an image is printed by forward printing and backward printing. The aging processing is performed by changing the count at which the aging processing is performed, between nozzles at the edge side portion of the nozzle array and nozzles at the center side portion of the nozzle array.

Abstract: A process for producing a chip in which plural ejection orifice arrays are arranged including conducting reduction projection exposure plural times to a wafer having a substrate and a photosensitive resin layer formed thereon while relatively moving positions of the wafer and a reticle to form ejection orifice array patterns in the resin layer, developing the patterns to form ejection orifice arrays in the resin layer, and dividing the wafer to form plural chips in which the plural ejection orifice arrays are arranged. The exposure is conducted once to form in the resin layer a first ejection orifice array pattern corresponding to partial ejection orifice arrays in an arranging direction thereof in one chip, a second ejection orifice array pattern corresponding to all ejection orifice arrays in one chip and a third ejection orifice array pattern corresponding to partial ejection orifice arrays in an arranging direction thereof in one chip.

Abstract: A process for producing a liquid ejection head by providing, in one chip, a liquid ejection head having a portion for ejection in which an ejection orifice array is arranged and a side portion having no ejection orifice array, these portions being provided with a member of a photosensitive material, arranging the chip on a common substrate in such a chip array that these two portions are alternately arranged, and separating each chip from the substrate, the process including the steps of relatively moving a reticle of an aligner along the chip array for a photosensitive material on the substrate to expose each chip, and developing the material to obtain the member. A first reticle for forming the portion for ejection and a second reticle for forming only the side portion are used. The exposure includes a first and a second exposure treatment respectively by the first and second reticles.

Abstract: A liquid discharge head includes a substrate including an energy generating element that generates energy used to discharge liquid and a discharge port member having a discharge port surface with a discharge port line including discharge ports, through which the liquid is discharged, arrayed in a first direction. The discharge port surface includes a groove portion disposed between the discharge port line and a first end of the discharge port member in a second direction intersecting the first direction. The groove portion extends along the discharge port line. The discharge port surface further includes an inclined surface disposed between an end of the discharge port line and a second end of the discharge port member in the first direction. The inclined surface is inclined toward the second end.

Abstract: A liquid discharge head includes a plurality of discharge ports configured to discharge liquid, a supply port configured to retain the liquid to be discharged from the plurality of discharge ports, a first pressure chamber including a first energy generation element to discharge a predetermined amount of liquid droplets, a second pressure chamber including a second energy generation element to discharge an amount of liquid droplets greater than the predetermined amount, a first flow path through which the supply port and the first pressure chamber communicate with each other, and a second flow path through which the first pressure chamber and the second pressure chamber communicate with each other.

Abstract: A process for producing a chip in which plural ejection orifice arrays are arranged including conducting reduction projection exposure plural times to a wafer having a substrate and a photosensitive resin layer formed thereon while relatively moving positions of the wafer and a reticle to form ejection orifice array patterns in the resin layer, developing the patterns to form ejection orifice arrays in the resin layer, and dividing the wafer to form plural chips in which the plural ejection orifice arrays are arranged. The exposure is conducted once to form in the resin layer a first ejection orifice array pattern corresponding to partial ejection orifice arrays in an arranging direction thereof in one chip, a second ejection orifice array pattern corresponding to all ejection orifice arrays in one chip and a third ejection orifice array pattern corresponding to partial ejection orifice arrays in an arranging direction thereof in one chip.

Abstract: A process for producing a liquid ejection head by providing, in one chip, a liquid ejection head having a portion for ejection in which an ejection orifice array is arranged and a side portion having no ejection orifice array, these portions being provided with a member of a photosensitive material, arranging the chip on a common substrate in such a chip array that these two portions are alternately arranged, and separating each chip from the substrate, the process including the steps of relatively moving a reticle of an aligner along the chip array for a photosensitive material on the substrate to expose each chip, and developing the material to obtain the member. A first reticle for forming the portion for ejection and a second reticle for forming only the side portion are used. The exposure includes a first and a second exposure treatment respectively by the first and second reticles.

Abstract: An embodiment of this invention is directed to preventing a decrease in the number of media printable with ink in an ink tank owing to an increase in waste ink in aging processing, and an increase in aging processing time. According to the embodiment, aging processing is executed as follows in a printing apparatus in which a printhead including a plurality of nozzles and a nozzle array formed from these nozzles and discharge ink is reciprocally scanned in a direction different from the direction of the nozzle array, and an image is printed by forward printing and backward printing. The aging processing is performed by changing the count at which the aging processing is performed, between nozzles at the edge side portion of the nozzle array and nozzles at the center side portion of the nozzle array.

Abstract: The print head includes an energy generating element, a chamber for accommodating liquid, and an ejection opening arranged in a position corresponding to the energy generating element. The ejection opening includes at least one projection projecting inside of the ejection opening, the ejection opening having a first region between a front end of the projection and an inner wall of the ejection opening positioned at the shortest distance from the front end, and second regions positioned in both sides of the projection and different from the first region, and when a width of the projection at a chamber-side opening face is represented as a1 and the maximum width of the projection is represented as a2, a relation a1<a2 is established and the width of the projection decreases gradually or step by step from a position having the width of a2 to the chamber-side opening face.