Abstract: A method of producing an ink jet recording head, in which a discharge port surface provided with a discharge port, through which ink is discharged, is provided comprises a conductive treatment step of carrying out a conductive treatment of the discharge port surface in a state where a material is present in the portion of the discharge port, a removing step of removing the material to open the discharge port, and an electrolytic deposition step of electrolytically deposit a water repellent material in the conduction-treated region of the discharge port surface.

Abstract: A substrate having plural recording elements and electrical leads for supplying electric signals to the recording elements includes electrical contacts for external electrical connection for reception of image signals used for driving the recording elements; and a processing circuit for converting signals which are serially supplied to the connecting contact to parallel signals to be applied to the recording elements.

Abstract: A liquid jet recording head for discharging liquid droplets onto a recording medium includes a support, heat-generating resistance layer provided on the support for generating heat energy to discharge the liquid droplets, a pair of electrodes electrically connected to the heat-generating resistance layer, and heat-generating sections each serving as a portion for generating the heat energy, each head generating section comprising the heat-generating resistance layer sandwiched by the pair of electrodes. Plural discharge openings serve to discharge liquid droplets, a liquid chamber houses liquid, and there are plural liquid paths, each liquid path having an associated heat generating section, and communicating with an associated discharge opening and with the liquid chamber to supply liquid to the associated discharge opening from the liquid chamber.

Abstract: Disclosed is a thin-film resistor element for an ink jet head. In the thin-film resister element, a protective film is used having a multi-layered structure, the proportion of Ar atoms contained in a lower area of the protective film located in contact with the heating resistor is set between 0.2 wt % and 6.0 wt %, and that in an upper area of the protective film is set between 1.0 wt % and 9.0 wt %.

Abstract: A liquid jet recording head comprises plural discharge port groups and a corresponding plurality of liquid chambers for containing liquid to be discharged from the discharge ports. Each of the plural discharge ports has an opposing heat generating element, all of the heat generating elements being disposed on a single substrate having supply holes therein to supply liquid to the liquid chambers. The heat generating elements, being opposed to the discharge ports, are also disposed in groups, each having a common electrode and individual electrodes for the multiple heat generating elements in the group. The supply holes are located in the same area of the substrate as the individual electrodes, thus making the head compact.

Abstract: In an ink jet recording apparatus in which a filter is placed in an ink supply route, when an ink flow is formed in the ink supply route by ink ejection during recording operations and so on, a valve does not contact firmly to the filter, but when an ejection recovery operation is performed and an ink flow velocity increases, the valve contacts firmly to the filter and covers up a part of the filter. With this structure and operation, the effective cross-section area of the filter decreases and hence, a given quantity of pressure difference is produced between the upstream side and the downstream side of the filter. As a result, bubbles unable to pass through the filter at recording operations can pass through the filter when ejection recovery operations are performed.

Abstract: A liquid jet recording head comprises a substrate comprising a support, a resistive heater layer, electrodes electrically connected with the resistive heater layer, a portion of the resistive heater layer located between the electrodes being an electrothermal transducer, and an upper layer comprising a first protective layer comprising an inorganic insulating material, a second protective layer comprising an inorganic material, and a third protective layer comprising an organic material, wherein and the second protective layer and the third protective layer overlap each other in the vicinity of a portion where heat is generated by the electrothermal transducer and the overlapping width of the second protective layer and the third protective layer ranges from 10 .mu.m to 500 .mu.m. In another embodiment, the second protective layer extends along plural liquid flow paths for substantially less than the length thereof in a continuous strip that covers adjacent transducers.

Abstract: An ink jet recording head comprises a substrate including a heat-generating resistance layer disposed on a support to provide a heat-generating section with two ends, a pair of electrodes on the support being connected electrically to the ends of the heat-generating sections. A member, joined to the substrate, has a recessed portion for forming a liquid pathway connected to an orifice for ejecting liquid. The member and substrate are joined so that the ends of the heat-generating section correspond to the liquid pathway. An organic material protective layer on the electrodes proximate to the ends of the heat-generating section is omitted from the heat-generating section and in the vicinity of an edge of the support where the liquid pathway is connected to the orifice. This configuration prevents the organic material protective layer from being subjected to the high temperatures attained by the heat-generating section and to the mechanical stresses encountered when the edge of the head is machined.

Abstract: Method of removing a layer of glass formed on a sintered body which is manufactured by hot isostatic pressing of a preformed body of inorganic powder (e.g., silicon nitride powder and silicon carbide powder) in a pressure medium at a sintering temperature, wherein the sintered body of inorganic powder is retained in alkali solution at a high temperature for a predetermined time, preferably under a predetermined pressure.

Abstract: This specification discloses a liquid injection recording head in which a support member provided with an energy generating member for generating energy utilized to discharge liquid and form flying droplets is flexible.

Abstract: A serial type liquid jet recording apparatus includes a recording head having an array of plural liquid ejecting devices arranged in a column direction to eject droplets of recording liquid on a recording material; an end portion driving circuit for driving one or more end liquid ejecting devices of the plural ejecting devices; a central portion driving circuit for driving the remaining liquid jet ejecting devices; and an adjusting device for adjusting a quantity of the droplet only from the end ejecting devices by changing a voltage level or a pulse width of a driving voltage of the end portion driving circuit independently of the central portion driving circuit.

Abstract: A sintered silicon nitride contains at least 90% of .beta.-type silicon nitride, wherein said .beta.-type silicon nitride consists essentially of 35 to 80% of large crystal particles with the remainder of small crystal particles, said large crystal particles having a mean particle length being at least two times as long as that of said small crystal particles. This sintered silicon nitride is obtained by a method wherein one batch of starting silicon nitride powders, whose primary particles have a mean particle size of 0.1 to 0.5 .mu.m, and another batch of starting silicon nitride powders, whose primary particles have a mean particle size of 0.5 to 0.7 .mu.m, are blended with a sintering aid or aids at a given weight ratio, and the thus obtained blend is formed or compacted and sintered.

Abstract: A method for driving a liquid-jet recorder having electric heaters for forming flying liquid droplets by jetting a liquid is characterized by applying no voltage to the electrodes of each electric heater for the moments the heater is not driven during the operation of the recorder.

Abstract: This specification discloses a liquid injection recording head in which a support member provided with an energy generating member for generating energy utilized to discharge liquid and form flying droplets is flexible.

Abstract: A liquid jet recording head is provided with a liquid discharging portion having an orifice provided to discharge liquid and form flying liquid droplets and a liquid flow path communicating with the orifice and having as a part of the construction thereof a heat-acting portion in which heat energy for forming the liquid droplets acts on the liquid. The heat acting portion includes electro-thermal converting element comprising a heat-generating resistive layer provided on a base plate and at least a pair of opposed electrodes between which a heat-generating portion is formed by the resistive layer, wherein the width of the electrodes in at least the portion thereof which is in contact with the heat-generating portion is greater than the width of the heat-generating resistive layer corresponding thereto.

Abstract: A liquid jet recording apparatus comprising: liquid chambers communicating with a plurality of discharge orifices for discharging a recording liquid to form flying liquid droplets for accommodating the recording liquid; and heat generating elements for generating energy used for forming the flying liquid droplets, wherein a plurality of element groups, each of which includes a plurality of said heat generating elements on the same substrate are respectively and independently provided, and each liquid chamber is independently provided in each of the element groups.

Abstract: A method of producing a liquid-jetting head capable of recording in a plurality of colors comprises the steps of providing a base member having a plurality of heaters thereon, at least one plate member having at least one perforation therethrough with a predetermined shape and an orifice plate having holes therethrough, and laminating the base member, plate member and orifice plate together to provide a laminated liquid-jetting head having a plurality of liquid supply paths, each including a branched liquid path, formed by the perforation, from which liquid can be ejected through the orifices by the action of heat energy applied to the liquid in the liquid path by the heaters. Also disclosed is an image recording apparatus using the laminated liquid-jetting head.

Abstract: In a process for manufacturing an electrothermal transducer for a liquid jet recording head comprising a support, a resistive heater layer overlying the support, at least a pair of electrodes electrically connected with the resistive heater layer and disposed opposite to each other, and a protective layer composed of an insulating material, at least defective portions in the protective layer of the electrothermal transducer are subjected to an anodic oxidation treatment.

Abstract: In a liquid jet recording head having a liquid discharging conduit, the ratio of the average cross-sectional area of the conduit at the liquid introducing region to that at the energy actuating region is greater than 1.

Abstract: A liquid jet recording head comprises an electro-thermal transducer having a heat-generating resistance layer provided on a substrate, a pair of electrodes connected electrically to said heat-generating resistance layer and disposed with a gap so as to confront each other and a heat-generating section provided between these electrodes; a liquid discharging section corresponding to said electro-thermal transducer having an orifice provided for forming flying liquid droplets and a liquid pathway connected to said orifice and having a heat acting portion where heat energy for forming liquid droplets acts on liquid as a part of its constitution; and a liquid chamber for storing said liquid to be supplied to said liquid pathway, which comprises forming said electrodes thinner in the vicinity of at least the portion in contact with said heat-generating section as compared with other portions of the electrodes.