Abstract: An ink jet recording apparatus comprises an ink tank containing ink; a recording head for performing recording by selectively ejecting ink; a mounting portion for mounting the ink tank and the recording head; a liquid passage coupling portion provided on either or both of the ink tank and the recording head for separating or connecting the ink passages in the ink tank and the recording head; a holding portion provided on either or both of the ink tank and recording head for guiding the ink tank to the recording head in order to hold them separably; and an electrically or mechanically connecting portion provided on either or both of the recording head and mounting portion for electrically or mechanically connecting the recording head to or separating it from the mounting portion.

Abstract: An ink jet recording apparatus includes a detachable ink cartridge for storage of the ink to be supplied to a recording head. A joint of an ink supply line in the ink jet recording apparatus to be coupled with an ink outlet portion of the ink cartridge for delivering the ink is loosely fitted to be slidable in a direction crosswise to an axis of the supply line toward a coupling position with the ink outlet portion.

Abstract: An ink jet recording apparatus comprises an ink tank containing ink; a recording head for performing recording by selectively ejecting ink; a mounting portion for mounting the ink tank and the recording head; a liquid passage coupling portion provided on either or both of the ink tank and the recording head for separating or connecting the ink passages in the ink tank and the recording head; a holding portion provided on either or both of the ink tank and recording head for guiding the ink tank to the recording head in order to hold them separably; and an electrically or mechanically connecting portion provided on either or both of the recording head and mounting portion for electrically or mechanically connecting the recording head to or separating it from the mounting portion.

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: An ink jet cartridge has a recording head portion and an ink containing portion which are detachably mountable relative to each other. The recording head portion ejects ink to effect recording with the ink. The cartridge includes a first ink container, provided in the recording head portion, for containing the ink; a second ink container, provided in the ink containing portion, for containing the ink; and an ink communication tube for establishing ink communication between the first ink container and the second ink container, wherein the ink communication tube is not externally exposed.

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.

Abstract: An ink jet recording apparatus including a heating member for heating a recording medium in order to accelerate the fixation and adhering of liquid ink being discharged from a recording head onto the recording medium, wherein the heating of the recording medium promotes the evaporation of the liquid ink but creates moisture in the area of the recording head. A moisture condensation preventing member positioned near the recording head decreases the moisture in the vicinity of the recording head. This prevents condensation of this moisture on the recording head, which can lead to faulty recording.

Abstract: An ink jet head includes first and second members for constituting liquid passages by joining them together; the second member has an ejection outlet forming member having a thickness a and is provided with a jaw having a dimension b, wherein an inside end of an ejection outlet of the ejection outlet forming member is displaced by a distance c from adjacent wall of a liquid passage, with b.gtoreq.5 microns, c.gtoreq.3 microns, and 20 microns.ltoreq.a+b.ltoreq.60 microns.

Abstract: Disclosed herein is an ink comprising a dye having at least one anionic group, an amino acid type polyamine or a polyethyleneimine containing at least 7 nitrogen atoms in its molecule, and water, wherein the dye is either a metallized azo dye or a nonmetallized azo dye satisfying the following conditions (x) and (y) at the same time:(x) no anionic group is situated at an ortho position to the azo bond, and at least one anionic group exists at another position than the ortho position to the azo bond; and(y) at least one aromatic residue is bonded to the azo bond, and the aromatic ring of the aromatic residue is a benzene or naphthalene ring, with the proviso that the aromatic rings situated on both sides of the azo bond are not naphthalene rings at the same time if present.

Abstract: A liquid storing container storing liquid, therein and having a supply port for supplying the liquid to the outside has flow rate control means having a slit adapted to be closed in a steady state and to be opened for predetermined differential pressure or greater and controlling the flow rate of the liquid supplied from the supply port to the outside, and pressure regulating means disposed more adjacent to the supply port than to the flow rate control means for regulating the pressure of the liquid more adjacent to the supply port than to the flow rate control means.

Abstract: An ink tank for storing ink to be supplied to a recording unit comprises a bag-like member arranged in an inner space of the ink tank and communicating with the atmosphere, which bag-like member has a volume variable from substantially zero to a volume substantially equal to that of the inner space of the ink tank. Ink is stored in a space defined between the ink tank and the bag-like member and a liquid path is formed in an inner wall surface of the ink tank.

Abstract: Disclosed herein is an ink comprising a coloring material and a liquid medium dissolving the coloring material therein, wherein the ink comprises a dye having at least one ammonium ion as a counter ion and an ammonium salt of an inorganic or organic acid.

Abstract: An ink jet recording head unit for performing a recording operation by discharging ink is desclosed. The ink jet recording head unit includes an ink jet head portion having an ink passage communicated with a discharge port for discharging ink and a substrate having an energy generating element for causing energy for discharging ink to act on ink present in the ink passage, the ink being supplied through an ink receiving port of a connecting portion; and an ink supply member having a connecting portion to be connected to the ink jet head portion so as to supply ink to the ink jet head portion via the connecting portion.

Abstract: An ink storage unit used in an ink jet recording apparatus for recording by ejecting ink comprises a plurality of ink storage chambers, a plurality of movable walls and a mechanism for holding each of the movable walls. Each of the ink storage chambers stores ink. Each of the movable walls is provided in the each ink storage chamber respectively so as to seal stored ink against air, and each movable wall can move according to a change of amount of ink in each ink storage chamber. The mechanism for holding the movable walls exerts a force opposed to a force which is exerted on the each movable wall according to the change of amount of ink, on each of the movable walls so as to make the pressure in each ink storage chamber an appropriate negative pressure.

Abstract: An ink jet head includes first and second members for constituting liquid passages by joining them together; and a clamp for applying a line pressure to one of the members. By using such a clamp, the pressing force can be concentrated in a line to provide a uniform pressing force to ensure reliable clamping.

Abstract: An ink jet head includes a base member, a first member having recesses and coupled with the base member to form ink passages using the recesses and a second member integral with the first member and extending at an angle from an end of the first member, the second member having ink ejection outlets communicating with the ink passages.

Abstract: A liquid jet head includes a heat generating element for producing a bubble to eject liquid from the head, a heat acting zone in which heat generated by the heat generating element produces a bubble in the liquid, a liquid supply passage adjacent the heat acting zone and having a liquid supply opening, with a center, for supplying liquid to the heat acting zone, and a liquid ejection passage adjacent the heat acting zone and having an orifice, with a center, through which the liquid is ejected, the liquid ejection passage including a diverging portion extending in a direction from the heat acting zone toward the orifice.

Abstract: An ink jet cartridge is composed integrally of a recording head and an ink tank, which are constructed in mutually separable manner, in order to enable repeated use of the recording head by replacement of the ink tank. In an ink supply part in the ink tank, an elastic partition wall is provided with a slit which is normally closed but is opened under a predetermined pressure difference. The slit is so designed as to generate an appropriate negative pressure on the recording head, thereby preventing ink leakage. Also a slit shielding valve member is provided to shield the slit at the abrupt inhaling action of the ink tank at the detaching of the ink tank, in order to prevent air intrusion into the ink tank.

Abstract: An ink container for containing ink includes an outer casing; an inner casing, in the outer casing, for containing the ink therein; filler material disposed between the outer casing and the inner casing to isolate the ink from ambient condition change.

Abstract: A liquid-discharge recording apparatus such as an ink-jet printer comprises: a liquid-discharge recording unit having an emission energy generating device including an electrothermal energy converting device which can heat a recording liquid such as an ink to form liquid droplets in response to an electrical signal, in which this recording unit emits the liquid droplets and deposits them on a recording paper and thereby recording thereon; a recording unit control circuit which can set and supplies the electrical signal to form the liquid droplets to the emission energy generating device in response to a recording signal; and an emission controller for setting the electrical signal to form the liquid droplets to the recording unit control circuit when a power supply is turned on, thereby allowing the recording unit to emit the liquid droplets in accordance with an environmental condition such as a temperature of the recording liquid.