Abstract: This invention is directed to a head substrate capable of high-quality printing even when the environmental temperature, print duty, and printhead itself change, a printhead, a head cartridge, and a printing apparatus using the printhead. The head substrate includes a plurality of heaters, a constant electric current source which generates a constant electric current used to drive the heaters, and a reference current generation circuit which generates a reference current for generating the constant electric current. The head substrate also includes a MOSFET which drives the heaters by the constant electric current obtained by driving the constant electric current source in accordance with the reference current, and a switch which determines the time for which the reference current is generated. The open-close time of the switch can be externally controlled.

Abstract: An ink jet head movable in a main scan direction includes first and second groups of ejection outlet arrays disposed on either side of a common liquid chamber and including plural ejection outlet arrays. In the first group, amounts of liquid ejected from outlets of first and second ejection outlet arrays, which are staggered, differ from each other. In the second group, a common ejection amount ejection outlet array ejects the same amount of liquid as that of one of the first and second ejection outlet arrays and a non-common ejection amount ejection outlet array ejects an amount of the liquid that differs from that of the first ejection outlet array group. The ejection outlets of the common and non-common ejection amount ejection outlet arrays are disposed in a staggered arrangement. The ejection outlets of the second ejection outlet array group are disposed with deviation of ½ of an interval at which the ejection outlets of the first ejection outlet array group are arranged.

Abstract: An ink jet recording head can, when a smaller liquid droplet is obtained, suppress or reduce stagnation of liquid in a second discharge port portion, prevent an offset meniscus in a discharge port, reduce unstable satellite(s) and realize stable discharging with less image deterioration and less floating mist. Two heaters are provided for each bubble generating chamber and the heaters are arranged substantially symmetrically with respect to a center or a center of gravity of a second discharge port portion. In a plan view viewed from a direction perpendicular to a main surface of an element substrate, at least one of two heaters is positioned to straddle an inner area of the second discharge port portion and an outer area outside of the second discharge port portion at a region where the bubble generating chamber is communicated with the liquid supply path.

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: A liquid ejection head is provided that is adapted, when the ejection of comparatively small ink droplets by one print head is required, to not only increase a printing speed and a printing resolution but also to prevent the occurrence of cavitation. The liquid ejection head includes: nozzles, for which heaters are formed to generate thermal energy used to eject ink; and bubble generation chambers, for which ejection ports are formed for ejecting ink upon the application of thermal energy provided by the heaters. Further, a partition wall is formed in each bubble generation chamber at a position opposite the ejection port.

Abstract: An ink jet recording head is provided with one heat generating member in each of ink flow paths, and the discharge port thereof is arranged on the extended line extending in the normal direction from the center of the main surface of the heat generating member to the surface of the substrate. Then, on the surface of the substrate, non-bubbling area is provided on the center within the projected area having the discharge port projected thereon. Bubble brought to the boil by the heat generating member pushes out ink from the discharge port by the pressure exerted by the bubble, while being communicated with the outside. With the structure thus arranged, it is made possible to enhance the precision of discharge direction of the liquid droplet discharged from the discharge port.

Abstract: A liquid ejecting head includes a plurality of nozzles each including an ejection outlet for ejecting a droplet, an ejection energy generating element, disposed at a position opposing the ejection outlet, for generating energy for ejecting a droplet, a pressure chamber provided with the ejection energy generating element and fluidly communicating with the ejection outlet, and a supply passage for supplying the liquid to the pressure chamber, wherein the nozzles include a first nozzle and a second nozzle which are connected with respective ones of the supply passages having lengths different from each other, wherein the first nozzle and the second nozzle are, disposed at one end portion with respect to a widthwise direction of an elongated supply chamber for supplying the liquid to the first nozzle, wherein the supply passage for the first nozzle extends in a direction perpendicular to a direction of liquid ejection from the ejection outlet and fluidly communicates with the supply chamber, and wherein the supp

Abstract: An object of the present invention is to provide an ink jet print head having plural types of nozzles arranged on the same substrate and through which ink droplets of different sizes are ejected, the ink jet print head exhibiting acceptable ejection performance regardless of the type of the nozzle. Thus, according to the present invention, each of the plural types of nozzles includes a bubbling chamber having an ejection energy generating element allowing an ink droplet to be ejected to a position located opposite an ejection port and an ejection port portion allowing the ejection port and the bubbling chamber to communicate with each other. Ratio of opening area of the ejection port portion at a position where the ejection port portion and the bubbling chamber communicate with each other, to the opening area of the ejection port is higher for the nozzle with a smaller ejection amount.

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: The present invention provides a print head that allows the characteristics of ejected ink to be adjusted for each ejection port in spite of a variation in the distance from an ink supply port to the heating element. In the print head according to the present invention, the area of the heating element decreases with increasing distance from the ink supply port and increases with decreasing distance from the ink supply port. The heating element is shaped like a rectangle that is longer in a direction orthogonal to a direction in which the plurality of ejection ports are arranged than in the direction in which the plurality of ejection ports are arranged. The aspect ratio of the heating element depends on the length of an ink channel through which ink is introduced into the bubbling chamber.

Abstract: A liquid recording head includes thermal energy generating means, having a flat plate configuration, for generating a bubble by thermal energy; a pressure chamber in which said thermal energy generating means is provided; a flow path for introducing liquid into said pressure chamber; a supply port in fluid communication with said flow path; and an ejection outlet provided at a position opposing said thermal energy generating means in fluid communication with said pressure chamber, wherein said thermal energy generating means includes a first major surface facing said ejection outlet and a second major surface opposite said first major surface, and wherein a distance between said first major surface and ceiling surface of said pressure chamber in which said ejection outlet is formed is shorter than a distance between said second major surface and a bottom surface of said pressure chamber.

Abstract: The present invention provides an ink jet recording head which, when a smaller liquid droplet is obtained, can suppress or reduce stagnation of liquid in a second discharge port portion, prevent an offset meniscus in a discharge port, reduce unstable satellite(s) and realize stable discharging with less image deterioration and less floating mist. In the present invention, two heaters 1a and 1b are provided for each bubble generating chamber and the heaters 1a and 1b are arranged substantially symmetrically with respect to a center or a center of gravity of a second discharge port portion. In a plan view viewed from a direction perpendicular to a main surface of an element substrate, at least one of two heaters is positioned to straddle an inner area of the second discharge port portion and an outer area out of the second discharge port portion.

Abstract: A scanning speed for a carriage and a number of multi-pass are set in accordance with print density information of dots obtained from image data. This makes it possible to preferably output an image free from the occurrence of an end deviation without reducing throughput to a required extent or more.

Abstract: An ink jet recording head and an ink jet recording apparatus are provided to prevent occurrence of a white line or recording unevenness due to a head tilt, and realize a high image quality recording. For this purpose, in a recording head provided with nozzles ejecting three types of droplets, a large droplet, medium droplet and small droplet, nozzles are configured such that any nozzles are not arranged on the same line at the centers thereof in the main scanning direction.

Abstract: An ink jet recording head can, when a smaller liquid droplet is obtained, suppress or reduce stagnation of liquid in a second discharge port portion, prevent an offset meniscus in a discharge port, reduce unstable satellite(s) and realize stable discharging with less image deterioration and less floating mist. Two heaters are provided for each bubble generating chamber and the heaters are arranged substantially symmetrically with respect to a center or a center of gravity of a second discharge port portion. In a plan view viewed from a direction perpendicular to a main surface of an element substrate, at least one of two heaters is positioned to straddle an inner area of the second discharge port portion and an outer area outside of the second discharge port portion.

Abstract: A liquid ejecting head includes a plurality of ejection outlets for ejecting droplets; liquid flow paths in fluid communication with said ejection outlets; and a liquid supply opening for supplying the liquid to said liquid flow path; wherein said ejection outlets include first ejection outlets and second ejection outlets which are disposed at least at one side of said liquid supply opening, wherein said first ejection outlets are nearer from said liquid supply opening than said second ejection outlets, and said first ejection outlets and said second ejection outlets are arranged in a staggered fashion; first recording elements for said first ejection outlets; second recording elements for said second ejection outlets, wherein each of said first recording elements includes one heat generating resistor in the form of a rectangular shape having a long side extending along a direction crossing with an arranging direction of said ejection outlets; and wherein said second recording element includes a plurality of

Abstract: An ink jet head movable in a main scan direction includes first and second groups of ejection outlet arrays disposed on either side of a common liquid chamber and including plural ejection outlet arrays. In the first group, amounts of liquid ejected from outlets of first and second ejection outlet arrays, which are staggered, differ from each other. In the second group, a common ejection amount ejection outlet array ejects the same amount of liquid as that of one of the first and second ejection outlet arrays and a non-common ejection amount ejection outlet array ejects an amount of the liquid that differs from that of the first ejection outlet array group. The ejection outlets of the common and non-common ejection amount ejection outlet arrays are disposed in a staggered arrangement. The ejection outlets of the second ejection outlet array group are disposed with deviation of ½ of an interval at which the ejection outlets of the first ejection outlet array group are arranged.

Abstract: A liquid discharge head substrate has improved protection performance of protective films for protecting heaters while effective bubble-forming regions are being secured. The protective films for protecting a plurality of heating elements provided on a substrate are formed using a platinum group element and are separately provided for the respective heating elements.