PURPOSE:To enable the development of capacity having excellent faithfulness and certainly in the response to a recording signal and especially excellent in durability, by arranging a partition wall in the vicinity of a heat acting surface in such a shape that the flowline width of a liquid flowline is not made constant. CONSTITUTION:A heat acting surface 115 indicates a part where a heat generating part 116 is projected to an upward vertical direction with respect to the bottom surface of a liquid chamber while the vicinity of the heat acting surface 115 indicates a part where the distance from the end part of the heat acting surface 115 is in about 100mum and the indefiniteness in the flowline width W of a liquid flowline indicates both cases one of which is widen in the flowline width and the other of which has a part where the flowline width becomes narrow. When the flowline width is not constant in the vicinity of the heat acting surface, the resistance of a liquid stream during the replenishment of ink caused by the emission of the ink and the disappearance of bubbles becomes unbalanced in the vicinity of the heat acting surface and, therefore, the ink is re- replenished in the arrow direction. Bubbles B1 resulting in impact generated on the heat acting surface disappear as bubbles B2 at a position shifted from the heat acting surface and, therefore, the destruction of the heat acting surface, in its turn, an electricity- heat converting body can be avoided.

Liquid jet recording apparatus

A high-quality image is printed with reduced bleeding in colors that may appear at a boundary between a black image and a color image. A head for ejecting black ink and a head for ejecting color ink perform three times of scanning while feeding is carried out therebetween for moving the printing medium by four pitches of ejection openings arranged on the heads, different ejection openings are caused to correspond to a scanning area, which corresponds to the four pitches, and multi-pass printing is performed to complete printing on the area. The black head completes printing of the black image, and then, the color head completes printing of the color image adjacent to the black image. The arrangement of ejection openings is determined so that between last scanning for completing printing of the black image and the first scanning for printing of the color image, scanning with no performing printing exists.

Ink jet printing apparatus and ink jet printing method

A thermal ink jet printer is disclosed in which ink droplets are ejected from an orifice by the explosive formation of a vapor bubble within the ink supply due to the application of a two part electrical pulse to a resistor within the ink supply. The electrical pulse comprises a precurser pulse and a nucleation pulse; the precurser pulse preheats the ink in the vicinity of the resistor to a temperature below the boiling temperature of the ink so as to preheat the ink while avoiding vapor bubble nucleation within the ink supply and the subsequently occuring nucleation pulse very quickly heats the resistor to near the superheat limit of the ink.

Thermal ink jet printer

Microchannels having at least an acrylic inner surface and methods of their use in electrophoretic applications are provided. The subject microchannels may be in the form of a variety of configurations suitable for holding an electrophoretic medium. The subject microchannels give rise to substantially reduced EOF and/or adsorption as compared to fused silica under conditions of electrophoresis and find use in a variety of electrophoretic applications in which charged entities are moved through a medium under the influence of an applied electric field.

Acrylic microchannels and their use in electrophoretic applications

An ink cartridge detachably mountable to an ink jet recording apparatus, the ink cartridge containing ink to be supplied to a recording head includes an ink container for containing the ink; and an adaptor having a receptor for detachably receiving the ink container and an information medium for storing information relating to the ink, the information being transmitted to the ink jet recording apparatus when the ink cartridge is mounted therein.

Ink jet apparatus and ink jet cartridge therefor

An ink jet recording method which comprises contacting or bringing closer an electro-thermal transducer with or to a recording liquid in an operating chamber having a discharge orifice, introducing into the electrothermal transducer an input pulse signal with its pulse width being in a range of from 01 μsec to 500 μsec, said input pulse signal being introduced in such a manner that its input cycle becomes at least three times as large as said pulse width, discharging and sputtering said recording liquid from said discharge orifice in the form of fine droplet in accordance with operating force developed within said operating chamber, and effecting image recording on the surface of a recording medium with the liquid droplets

Ink jet recording method

PURPOSE: To enable the gradation recording by getting the heating element of an electrothermal transducer constructed so that it can produce a heat gradient in an ink jet head wherein the change in pressure by thermal energy is utilized. CONSTITUTION: The plane structute of a heating element 301 is formed to be a trapezoid and at both ends thereof electrodes 302 and 303 are provided. When the current density at the part A and part B is changed, a difference can be made in the quantity of the heat per unit time in each part. In addition, by proividing a heat-accumulating layer 403 and a protecting film 406 having a grade in thickness from an electrode 404 toward an electrode 405 on a substrate 401 as shown in the figure of a cross-sectional structure, the grade is also given to the quantity of the heat applied by the surface of a heating element Δl to the liquid contacting with the surface per a unit time. By this gradient in the quantity of the heat, the quantity of air bubbles formed on the contacting surface of the heating element is changed and thereby the quantity of discharged ink can also be changed. COPYRIGHT: (C)1980,JPO&Japio

Liquid jet recording method

PURPOSE:To form excellent ink drops at a desired frequency to carry out stable recording by rotatably supporting an orifice for injecting ink and further supporting an ink drop defining member rotatably along the outer periphery of the rotation of the orifice. CONSTITUTION:In an ink jet recording device in which an ink stream is rendered into drops through an ink injecting orifice 3 and carrying out recording under the control corresponding to the image signal, a cylindrical rotary head 1 having at its inner part an ink chamber 2 and at its peripheral wall the orifice 3 is fixed by mounted on a rotary shaft 5. Further, a shield case 6 having an aperture 7 is rotatably provided along the outer periphery of the rotation of the orifice 3. By this organization, unstable liquid drops formed at the time of starting the rotation of the rotary head 1 are caused to fly only through the aperture having a predetermined positional relationship with the orifice 3 thereby to prevent the flight of unstable ink drops and carry out stable recording.

Ink jet recording device

A liquid droplet forming apparatus is improved by selecting particular conditions concerning total opening area of communicating ports, an area of the region having the communicating ports; various lengths in the direction along the axis of the actuating chamber; and volumes of various portions in the actuating chambers and the common liquid chamber.

Liquid droplet forming apparatus

A liquid droplet ejecting recording head comprises liquid ejecting portion including an orifice for ejecting liquid droplets and a heat actuating portion communicated with the orifice, and an electrothermal transducer as a means for generating heat energy, the heat energy acting on the liquid at the heat actuating portion for ejecting liquid droplets, characterized in that the part contacting the liquid of the heat actuating portion is made of a material whose ΔW is not more than one-tenth of 1 mg/cm2 where ΔW is a decrement weight of the material per unit area in mg/cm2 at a time "t", when subjected to a weight decreasing test, the "t" being a time at which ΔW(Al) is 1 mg/cm2 where ΔW(Al) is a decrement weight of an aluminum plate of 99.9% in purity per unit area of the tested surface when subjected to the weight decreasing test.

Takahashi Michiko

Papers

Ink jet recording method

Liquid jet recording method

Ink jet recording device

Liquid droplet forming apparatus

Liquid droplet ejecting recording head