Abstract: The present invention provides a liquid ejection head for which the peeling of an orifice plate from a substrate seldom occurs, even in a structure such that the walls that define each energy application chamber are narrowed toward a ejection port. The walls that define a first pressure chamber are inclined inward within the first pressure chamber, so that the first pressure chamber is narrowed, toward an ejection port, along a direction perpendicular to the heater formation face on which heaters are arranged. Further, the walls that define each ink flow path are inclined in the ink ejection direction. Furthermore, the angle at which the walls that define the ink flow path are inclined relative to the ink ejection direction is smaller than the angle at which the walls that define the first pressure chamber are inclined inward, within the first pressure chamber.

Abstract: The landing precision of ink drops is improved to improve the image quality and increase the printing speed. An inkjet print head ejects ink supplied from an ink supply port from a plurality of ejection ports respectively connecting to ink paths having different flow resistances by using energy generated by a plurality of electrothermal transducer elements respectively corresponding to the plurality of the ejection ports, wherein each of the plurality of the ejection ports connected to the ink paths having a low ink flow resistance is arranged so that the center of each of the plurality of the ejection ports is positioned farther away from the ink supply port to the center of the corresponding electrothermal transducer element than each of the plurality of the ejection ports connected to the ink paths having a high ink flow resistance.

Abstract: A liquid ejecting head includes a substrate, a nozzle forming member for forming on a principal surface of the substrate a nozzle comprising a flow passage of liquid and an orifice for ejecting the liquid, and a dummy pattern. The dummy pattern has substantially the same dimension as at least a part of the nozzle and is formed so that a cross section of the dummy pattern is exposed at an end surface of the nozzle forming member.

Abstract: An ink jet recording apparatus includes a recording head having an ink ejection surface; a blade for wiping the ink ejection surface; blade cleaning means for cleaning the blade by collecting contamination liquid deposited on the blade and including at least ink; cleaning liquid supplying means for supplying, to the blade, cleaning liquid mainly comprising liquid having a volatility lower than the ink; a residual ink absorbing material provided at such a position that it is out of contact to the blade; and a discharge path for discharging the contamination ink collected by the blade cleaning means to the residual ink absorbing material.

Abstract: Provided are a printing head and an inkjet printing apparatus, which eject liquid droplets without leaving behind any bubble in each nozzle, thus having an enhanced durability. An ejection port of the printing head includes a first ejection port part communicating with the atmosphere and a second ejection port part having a cross-section orthogonal to an ejection direction being larger than a cross-section of the first ejection port part orthogonal to the ejection direction, and being formed between the energy effect chamber and the first ejection port part. In addition, the second ejection port part is formed to be eccentric to an electrothermal transducing element in an ink supply direction in which ink is supplied from an ink supplying port to the bubbling chamber.

Abstract: Wiping is performed every time when a predetermined period elapses. With the wiping performed step by step, a density of ink in liquid remaining on a discharge port surface is diluted, and becomes a predetermined density or lower. Accordingly, a condition can be maintained, in which the ink can be reliably discharged from a recording head when a recording operation is newly started, although the wiping is not additionally performed after the above wiping. In this case, even when the recording operation is started again or the recording operation is newly started after the several wiping operations, an amount of cleaning liquid used in the several times of wiping is proper to an intermission period. Thus, the cleaning liquid can be prevented from being wastefully consumed.

Abstract: An ink jet recording head includes a 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; wherein the ink flow paths are arranged at a density higher than 1200 dpi in an arranging direction of the ejection outlets; wherein 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.

Abstract: An ink-jet recording head of the present invention has two kinds of nozzles discharging different volumes of ink-drops. Large nozzles discharging the larger ink-drops and small nozzles discharging the smaller ink-drops are disposed alternately along a side of a common liquid chamber. The opening area of the large nozzles is larger than that of the small nozzles. Flow paths communicating with the small nozzles are shorter than those communicating with the other nozzles. Since the smaller ink-drops are discharged at higher frequency than the larger ink-drops, printing speed in high-quality recording using mainly the smaller ink-drops is improved.

Abstract: An ink-jet recording head has two kinds of nozzles discharging different volumes of ink-drops. Large nozzles discharging larger ink-drops and small nozzles discharging smaller ink-drops are disposed alternately along a side of a common liquid chamber. The opening area of the large nozzles is larger than that of the small nozzles. Flow paths communicating with the small nozzles are shorter than those communicating with the large nozzles. Since the smaller ink-drops are discharged at higher frequency than the larger ink-drops, printing speed in high-quality recording using mainly the smaller ink-drops is improved.

Abstract: An ink-jet recording head of the present invention has two kinds of nozzles discharging different volumes of ink-drops. Large nozzles discharging the larger ink-drops and small nozzles discharging the smaller ink-drops are disposed alternately along a side of a common liquid chamber. The opening area of the large nozzles is larger than that of the small nozzles. Flow paths communicating with the small nozzles are shorter than those communicating with the other nozzles. Since the smaller ink-drops are discharged at higher frequency than the larger ink-drops, printing speed in high-quality recording using mainly the smaller ink-drops is improved.

Abstract: An ink-jet recording head has two kinds of nozzles discharging different volumes of ink-drops. Large nozzles discharging larger ink-drops and small nozzles discharging smaller ink-drops are disposed alternately along a side of a common liquid chamber. The opening area of the large nozzles is larger than that of the small nozzles. Flow paths communicating with the small nozzles are shorter than those communicating with the large nozzles. Since the smaller ink-drops are discharged at higher frequency than the larger ink-drops, printing speed in high-quality recording using mainly the smaller ink-drops is improved.

Abstract: An ink-jet recording head of the present invention has two kinds of nozzles discharging different volumes of ink-drops. Large nozzles discharging the larger ink-drops and small nozzles discharging the smaller ink-drops are disposed alternately along a side of a common liquid chamber. The opening area of the large nozzles is larger than that of the small nozzles. Flow paths communicating with the small nozzles are shorter than those communicating with the other nozzles. Since the smaller ink-drops are discharged at higher frequency than the larger ink-drops, printing speed in high-quality recording using mainly the smaller ink-drops is improved.