Abstract: An ink jet head includes a plurality of liquid flow paths for ejecting the ink; and a plurality of heat generating resistors for the respective liquid flow paths, the heat generating resistor being independently drivable; wherein adjacent ones of the heat generating resistors are spaced by not more than 8 microns.

Abstract: An ink container includes an ink absorbing material accommodating chamber for accommodating an ink absorbing material for retaining ink to be supplied to a recording head; an ink supply opening connectable with said recording head to supply the ink to the recording head from said accommodating chamber; an air vent portion for fluid communication between said accommodating chamber with ambience; wherein said air vent portion has an inside opening in fluid communication with an inside of said accommodating chamber, an outside opening open to the ambience, and a fluid communication path in fluid communication with said inside opening and outside opening; wherein said outside opening takes, when-said container is mounted on an apparatus with which it is usable, a position lower than that taken by said inside opening.

Abstract: A sealed ink jet assembly which is removable from an ink jet apparatus includes an ink jet head which has an ejection outlet found at a first surface of the ink jet head, an energy generating element for generating energy to eject ink through the ejection outlet, and an electric contact portion for supplying an electric signal from the ink jet apparatus to the energy generating element by mounting the electric contact portion to the ink jet apparatus. The electric contact portion is provided on the surface of the ink jet head which differs from the first surface, and an integral sealing member covers both the ink ejection outlet and the electric contact portion. The integral sealing member is removed when the assembly is mounted onto the ink jet apparatus.

Abstract: A deviation of a clock rate of the timepiece clock signal is determined relative to a reference clock rate of a reference clock signal (CR) which is either issued while the mobile unit is switched on or is contained in a received signal. The reference clock rate is higher than the clock rate of the timepiece clock signal. A count number (N) is calculated based on the deviation of the clock rate of the timepiece clock signal. The clock signal is generated such that the clock pulses the clock signal are successively issued each time the clock pulses of the timepiece clock signal counted up to the count number.

Abstract: An ink container includes an ink storing portion for storing ink; an ink supplying portion for supplying ink to a recording head portion; an air vent for taking the atmospheric air into the ink container; and a hollow tube, one end of which opens to the atmosphere at the air vent, above the liquid level of the stored ink, and the other end of which opens within the ink container adjacent to the bottom portion of the ink container.

Abstract: An ink jet recording device includes a recording head unit having discharge ports for discharging ink, ink channels communicating to the discharge ports and leading the ink thereto, and an ink tank unit for storing ink to be supplied to the recording head unit. The recording head unit consists of a device for storing parameter information concerning the ink discharge characteristics, and a protective member disposed on a side face area adjacent to the discharge port formation face for preventing the ink from flowing around.

Abstract: An ink jet recording head wherein at least peripheral portions of discharge ports comprise a film which contains a polymer having a fluorine heterocyclic structure in the principal chain.

Abstract: An ink jet head has a substrate on which ejection energy generating elements are provided, and a ceiling plate having a plurality of grooves for forming ink passages. The ceiling plate is pressed against the substrate by a pressing member, i.e., a spring. To improve the ejection performance of the ink jet head, the contact portion of the ceiling plate pressed by the pressing member is divided into a plurality of portions.

Abstract: An ink jet head includes a plurality of liquid flow paths for ejecting the ink; and a plurality of heat generating resistors for the respective liquid flow paths, the heat generating resistor being independently drivable; wherein adjacent ones of the heat generating resistors are spaced by not more than 8 microns.

Abstract: An ink jet head includes a passage-forming member providing a plurality of ink passages and an orifice plate having an array of ejection outlets in communication with respective ink passages. The orifice plate has a plurality of edge portions and the ejection outlets are arranged along a line that runs parallel to at least one of the edge portions and intersects opposing edge portions at crossing points. A confining member is configured to hold the orifice plate against the passage-forming member only in areas proximate to the crossing points.

Abstract: An ink jet recording head, which can be used in a recording apparatus, is manufactured by preparing a first base plate provided with an energy generating structure for generating energy to discharge ink, preparing a second base plate provided with a discharge opening plate member on which are to be formed ink discharge openings for discharging the ink and recessed portions for forming ink flow paths, the ink flow paths being communicated with the discharge openings, and applying an ink repellant treatment on a surface of the discharge opening plate at a side where the ink is to be discharged in at least an area where the discharge openings are to be formed.

Abstract: An ink jet recording head is produced by forming in a first substrate a plurality of orifices for ejecting an ink droplet and a reference object for registration; forming in a second substrate ejection energy generating elements for supplying energy for ejecting the ink placed in liquid passages communicating with the orifices; and joining the first substrate and the second substrate together on the basis of the reference object for registration.

Abstract: An ink absorbing member is inserted in an ink tank housing which at least partly has a transparent portion. Used as this ink absorbing member is one having a reflection density after ink removal which is close to the reflection density of a melamine foam before ink injection. The amount of ink remaining in a cartridge of such a construction can be detected, for example, by a separate line sensor. The results of detection by the line sensor can be displayed by a remaining ink amount indicator provided on a control panel of the printing apparatus.

Abstract: An ink jet head comprises parts for holding liquid ink, the parts being sealed with a moisture-curing sealant composed mainly of an organic high polymer compound having an alkoxysilane moiety represented by Formula (1) in the molecule thereof: ##STR1## where X is hydrogen, methyl, ethyl, propyl or halogen; R is methyl, ethyl or propyl; and n is 1, 2 or 3.

Abstract: An ink container, as well as a method of making the same, which has ink absorbing material for retaining ink, a casing for holding the ink absorbing material, an ink supply port through which ink is withdrawn from the absorbing material, and an air vent. The air vent and ink supply port are each provided adjacent to different longitudinal halves of the ink absorbing material, and the casing is initially filled with an amount of ink which is larger than the quantity of ink which can be retained by the ink absorbing material. Then, ink adjacent to the air vent is removed to such an extent that the casing contains the quantity of the ink which the ink absorbing material can retain. Thus, ink is retained at a higher density adjacent to the ink supply port than adjacent to the air vent.

Abstract: A method of manufacturing a recording head for use in an ink jet head involves providing a discharge port formation member having a surface in which orifices are to be formed, treating a discharge port face of the discharge port formation member with a water-repellent material, and forming orifices by applying radiation from a pulsed laser beam to the discharge port formation member which has been treated by the material having a water-repellent property, so that forming the orifices creates byproducts. The method also involves sticking at least once a tape having an adhesive layer against the discharge port face of the discharge port formation member against at least peripheral portions of the orifices having the byproducts created in the orifice forming step sticking thereto and deposited therein, and peeling the tape therefrom.

Abstract: An ink jet recording head for discharging liquid and recording on a recording medium includes a substrate having a liquid path, and a discharge opening provided on a surface of the substrate and communicating with the liquid path. Plurality raised surface irregularities are formed on the surface of the substrate having the discharge opening. The surface irregularities are disposed in a predetermined pattern and have protruding portions which are distinct from one another and which have been subjected to a liquid repellant surface treatment.

Abstract: An ink jet head includes a first member provided with an ejection energy generating element for generating energy contributable to ejection of ink; a second member provided with a recess for defining an ink passage with a trapezoidal cross-section by being coupled with the first member, corresponding to the ejection energy generating element; and a third member provided with an ejection outlet which communicates with the ink passage and through which the ink is ejected.

Abstract: A recording head cartridge includes a recording head for ejecting recording liquid in the form of a droplet thereof; a container for containing the recording liquid; a communicating pipe for substantially balancing pressure in the container with an ambient pressure; a blocking plate disposed adjacent an inside opening of the pipe at a position away from the opening.