Abstract: A liquid jet recording apparatus for recording on a recording material with liquid droplets discharged through plural scanning nozzles. The number of the nozzles "n" (n.gtoreq.2) arranged at a pitch "P" (.mu.m), the distance "s" (.mu.m) of relative movement between the nozzles and the recording material between adjacent scans, the maximum number of ink droplets per pixel and per scan "k" (k.gtoreq.1), and the number of tone levels "g" are selected so as to satisfy the relationships: n/(s/p).gtoreq.2; and n/(s/p).times.k=g-1.

Abstract: A method of fabricating bubblejet print devices uses semiconductor fabrication techniques, and this method involves forming a heater means and an electrical connection to the heater means on a substrate, and forming a passageway through the substrate. A given end of the passageway is disposed adjacent to the heater means, and this given end is formed as an outlet for ejecting ink.

Abstract: A method for electrohydrodynamic printing wherein multiple colors are printed by discharging the receiving medium by reverse-sign corona discharge, then charging the receiving medium by corona discharge, and then printing the first color. The receiving medium is then discharged, and charged a second time by corona discharge. The process is repeated for each color used in the printing. As a result, the colors are printed in their intended locations without deflection even if the intended location is a dot of previously deposited color.

Abstract: A method for surface treatment of an ink jet recording head, having the step of transferring a surface treating agent provided on a support to the ink discharging opening surface having ink discharging openings of an ink jet recording head formed thereon from said support.

Abstract: An ink-jet printing apparatus can obtain good image quality and improve reliability by avoiding possibility of failure of the head. A target temperature, at which ejection of ink through an ink-jet printing head becomes the most stable is set. Also, a difference between the target temperature and an actual temperature of the ink-jet printing head is derived. When the difference is positive, the drive signal includes a pre-heating pulse and a main heating pulse having an interval therebetween. The pulse width or the interval is properly set. When the drive signal is negative, only the main heating pulse is included. When the absolute value of the difference is large, the pulse widths are set smaller. At this time, a drive frequency is lowered or a resting period at opposite end positions in the scanning directions is prolonged.

Abstract: Data is printed on a recording sheet by heating the recording sheet at a pre-printing heating region of a heat roller 20, and the recording sheet is further heated at a post-printing heating and fusing region to thereby be dried and fused. In the meantime, air introduced from an exhaust fan 50 is blown into a data writing section from bottom up in the same direction as a recording sheet feeding direction, so that not only the vapor generated from the recording sheet during the heating and the vapor generated from the ink during the printing are eliminated, but also a recording head 40 is cooled.

Abstract: Image data is thinned out by using thinning patterns having arrays not synchronized with an image data array according to an area gradation method at the same duty, and the resulting thinned image data is divisionally recorded on a predetermined area of a recording medium by using different record areas of a recording head while a scan operation is performed a plurality of number of times. The thinning patterns are formed such that substantially equal quantities of an ink are implanted in a plurality of number of times of the divisional recording.

Abstract: A recording apparatus employs a control unit to compensate for any variations in the feed speed of a recording medium. The recording apparatus includes a recording unit for recording an image on a recording medium in accordance with the image data; a speed detection unit for detecting the actual feed speed of the recording medium or of a feed unit for feeding the recording medium; and a control unit for controlling the record timing of the recording unit in accordance with a difference between a reference feed speed and the actual feed speed of the recording medium or feed unit detected by the speed detection unit.

Abstract: A liquid ejecting head for ejecting liquid by generation of a bubble includes an ejection outlet through which the liquid is ejected; a liquid flow path in fluid communication with the ejection outlet; a bubble generation region for generate the bubble in the liquid; a movable member disposed opposed to the bubble generation region and provided with a base portion and a free end portion closer to the ejection outlet than the base portion; wherein the movable member is displaced by a pressure produced by the bubble generated in the bubble generation region to eject the liquid through the ejection outlet; wherein the movable member has an inflection portion at a portion opposed to the bubble generation region.

Abstract: Provided is an ink-jet textile printing process imparting an ink to a cloth by ink-jet method, which process comprises at least the following three steps of(a) imparting dots with a dot diameter of from r to 2r (r is nozzle pitch) to said cloth, by causing ink droplets to fly by means of a head having a plurality of nozzles capable of making a record at equal intervals in a density of from 3 nozzles/mm to 35 nozzles/mm;(b) diffusing the ink dots adhered to the cloth within a range of from 0.2r to 3r as an increase in said dot diameter and simultaneously dyeing the cloth with the dye diffused in said cloth, by applying to said cloth having been subjected to the step (a) a heat treatment at 90.degree. C. to 150.degree. C. accompanied by steam;(c) washing away a dye having not been adsorbed or fixed.

Abstract: An ink jet print head includes a substrate and a plurality of nozzles provided on the substrate for ejecting ink. The plurality of nozzles are arranged in two dimensions on the substrate such that a shortest distance between adjacent nozzles in at least one dimension is shorter than a pixel pitch.

Abstract: The present invention relates to free-ink type ink-jet pens and, more particularly, to a method and apparatus for purging air from an on-axis ink accumulator. A biased regulator mechanism is provided within the pen to allow ink from a pressurized ink reservoir to be fed to the pen while maintaining a predetermined set point back-pressure at the printhead as needed for appropriate pen operation. A mechanism in communication with the ambient atmosphere is used in conjunction with a substantially constant force biasing mechanism to maintain the balance between the countervailing forces. Back-pressure is maintained substantially constant regardless of the ink flow rate from the ink reservoir into the accumulator. By application of a positive pressure to the ambient atmosphere mechanism, the biased regulator mechanism is forced open and any gas bubbles trapped within the accumulator is forced out through the reservoir ink feed.

Abstract: In a printing apparatus for performing a printing operation on both obverse and reverse surfaces of a continuous web paper with an ink jet printing machine, there is a construction having a first printing unit for printing on one surface of the continuous web paper and a second printing unit for printing on the other surface of the continuous web paper, in which the first printing unit and the second printing unit are arranged at an identical position in respective paths of travel of a first portion and a second portion of the continuous web paper as oriented in parallel to each other, as facing downwards and as shifted to each other in the direction perpendicular to directions in which the first portion and the second portion of the continuous web paper are traveling, and the path of travel of the first portion of the continuous web paper which is printed by the first printing unit and the path of travel of the second portion of the continuous web paper which is printed by the second printing unit are made c

Abstract: A recording apparatus includes an ink jet recording head having plural ejection outlets and thermal energy generating elements provided for the respective ejection outlets; a limiter for defining a using range of the heat generating elements in accordance with image forming conditions, a recording head driver for supplying to the heat generating elements outside the using range defined by the limiter driving signals insufficient to eject the ink and for supplying to the heat generating elements in the using range defined by the limiter a driving signal sufficient to eject the ink in accordance with an image signal.

Abstract: A method for manufacturing an ink jet recording head which includes a plurality of ejection outlets for ejecting ink; discrete ink passages communicating with respective ejection outlets; a common liquid passage communicating with the discrete ink passages for supplying ink thereto; a liquid chamber for supplying the ink to the common ink passages; and a filter. The filter includes plural projections between the common liquid passage and the liquid chamber, for preventing foreign matter from entering the discrete liquid passages. Adjacent projections define a liquid passing area having a size smaller than that of the ejection outlets.

Abstract: An inkjet printhead structure comprises novel resistor circuitry that is fabricated on two different substrate layers. The dual layer circuitry reduces the required substrate surface area and printhead shelf length to increase the printer operating frequency and print density. In one embodiment of the invention, heating resistors are spread out over portions of the substrate surface area and conductors are attached to opposite ends of the heater resistors in a novel configuration. To simplify routing, the circuitry is configured so that multiple heater resistors are coupled to the same conductor return path located on a second conductive layer. In a second embodiment of the invention, the heater resistors are dimensioned in the shape of a trapezoid to provide uniform heating. Alternative resistor shapes are then introduced to provide consistent heat dissipation for variances in resistor/conductor sheet resistance.

Abstract: A recording apparatus records an image by scanning a first recording head relative to a recording medium of a particular type. The apparatus includes the first recording head, a pattern recording controller, a reader, a restoring device, a second recording head, a discriminator and a control unit. The pattern recording controller controls recording of a predetermined pattern with the first recording head at a predetermined timing either on the recording medium or on a pattern recording medium different from the recording medium. The reader reads the predetermined pattern and the restoring device performs a discharge restoring operation of the recording head. The discriminator discriminates a recording state of the first recording head, based on the predetermined pattern read by the reader.

Abstract: A recording element driving unit has an electrical connecting member having a support member of electrically insulating material and electroconductive members arranged on the support member. Each electroconductive member has one end exposed on one surface of the support member and another end exposed on another surface of the support member. A recording element substrate having recording elements is connected to one exposed end of at least one electroconductive member. A driving element substrate has driving elements thereon, and each driving element has connecting portions. The driving elements are larger in number than a number of driving elements electrically connected to the recording elements and are fewer in number than the electroconductive members.

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 recording head has ejection outlets formed by treating a face of a plate for the ejection outlets with a water-repellent and irradiating the plate with a laser beam from the backside of the plate. The head is provided with a sealing member for sealing the ejection outlets. The water-repellent has a hardness of higher than the pencil hardness 6B at room temperature. A decomposition product layer is formed on the layer of the water repellent at peripheral portions of the ejection outlets.