Abstract: This invention is to solve the problem that when images are recorded mixedly in different resolutions, disturbance is brought to images, gaps are created between images, or excessively densified areas appear due to difference in resolutions, that is, changes of dot sizes and recording densities in recording in the area where images are recorded mixedly in high and low resolutions or such images are adjacently present.In a recording area in which images to be recorded in low and high resolutions are mixed, the recording position of images to be recorded in low resolution is offset relatively with respect to the images to be recorded in high resolution for the intended recording, thus achieving the objectives of this invention.Also, in the boundary portion where images to be recorded in low and high resolutions are adjacent to each other, supplementary dots are recorded or recorded dots are intermitted in accordance with the present invention. In this way, its objectives are achieved.

Abstract: A container for containing printing liquid for supplying to an ink jet head for an ink jet recording apparatus. The container includes a first chamber containing negative pressure producing material and having an air vent communicating with ambient air and a supply port for supplying printing liquid to the ink jet head. The container also includes a second chamber communicating with the first chamber via a communication port and providing a printing liquid reservoir for the first chamber. The capillary force provided by the negative pressure producing material adjacent a wall extending from the communication port and decreasing in a direction perpendicular to and towards the wall at least adjacent a part of the communication port which is uppermost in use of the container.

Abstract: An ink jet recording apparatus including a recording head for performing print recording by ejecting ink from an ejection orifice by thermal energy; temperature sensors provided in the recording head; a temperature calculation device for calculating a temperature change of the recording head in a unit time as a discrete value on the basis of the supply of energy input to the recording head, and for calculating the temperature change of the recording head by accumulating the discrete value in the unit time; a temperature presuming device for presuming a head temperature by both a calculated value of the temperature change and an adopted base value of the head temperature; a detection device for detecting a difference between the head presumed temperature and a detected temperature sensed by the temperature sensors; an update device for updating the adopted base value of the head temperature by the difference; and a control device for controlling ejection of the ink to be stabilized in accordance with the head

Abstract: The mounting positions of a plurality of recording heads (1Y, 1M, 1C, 1K) are set to be variable with respect to a paper feed direction, so that a post-ejection recording head (1Y) is mounted at the downstream side in the paper feed direction as compared to a pre-ejection recording head, thereby preventing generation of banding in color ink jet recording, and improving image quality.

Abstract: An ink jet recording method for recording in which an ink is discharged by the pressure of a bubble generated in the ink by means of thermal energy, having the steps of preparing an ink jet head having a liquid path provided with a heating element and communicated with a discharge opening supplying the ink into the liquid path, the ink having a surface tension equal to or less than critical surface tension of a recording medium generating thermal energy for generating a bubble with the heating element in such a manner that the bubble is communicated with the atmosphere from the discharge opening when the generated bubble has a negative internal pressure and discharging the ink from the discharge opening by means of the pressure of the bubble generated.

Abstract: An ink-jet recording apparatus, having a printer that performs recording by Jetting ink from a recording head according to recording data, comprises a plurality of signal lines that supply the recording data to the printer and are connected to a host for controlling the printer, and an information transfer unit for transferring the information to the host. Herein, the plurality of signal lines include at least a first signal line for transferring recording data and commands from the host to the printer, and a second signal line for transferring printer information to the host. Thus, the ink-jet recording apparatus offers excellent cost-efficiency, system reliability and operability.

Abstract: The ink jet recording apparatus includes: first ink tanks that are replaceable and contain first inks containing colorants; a second ink tank that is replaceable and contains a second ink containing no colorant; third ink generating means to generate third inks by mixing the first inks and the second ink; and third ink tanks that contain the generated third inks with different mixing ratios and can supply the third inks to recording heads for selective ejection.

Abstract: An ink jet recording apparatus performs the recording, using a recording head for discharging the ink onto the recording medium to effect the recording, while moving said recording head in a main scan direction. The recording head has a plurality of discharge orifice groups in the main scan direction, each of which has a plurality of discharge orifices for discharging the inks of different colors provided in a direction different from the main scan direction.

Abstract: An ink jet recording apparatus can obtain characteristics of temperature sensors precisely in a short time by detecting that a new recording head is installed and presuming the characteristics of the temperature sensors of the recording head.

Abstract: An ink jet recording apparatus for recording onto a recording medium by using a recording head for discharging the ink, comprising a heater provided in the recording head and a resistor provided externally of the recording head to determine the resistance of the heater provided in the recording head, thereby selecting the drive conditions of the recording head.

Abstract: A container for containing printing liquid for supplying to an ink jet head for an ink jet recording apparatus. The container includes first and second chambers, with the first chamber containing negative pressure producing material and having an air vent communicating with ambient air and a supply port for supplying printing liquid to the ink jet head. The second chamber communicates with the first chamber via a communication port and provides a printing liquid reservoir for the first chamber. In an area adjacent a wall extending from the communication port, a capillary force provided by the negative pressure producing material decreases in a direction perpendicular to and towards that wall at least adjacent a part of the communication port which is uppermost when the container is in use.

Abstract: An ink jet recording apparatus comprises a recording head adapted for ejecting at least two colors of ink, a discriminater for discriminating between character data and bit map data, and a controller for selecting a character data recording mode or a bit map data recording mode in accordance with a discrimination result by the discriminater. The controller controls an amount of ink ejection in the bit map data recording mode to be less than that in the character data recording mode.

Abstract: There are provided a color image forming method with liquids, capable of ensuring sharpness and high density in basically all the color images, and a recording apparatus therefor. This invention employs a black ink of relatively superior diffusibility and color inks of relatively superior penetrability, different in color from the black ink, and is characterized by forming the boundary area of a black image area with the color inks instead of the black ink.

Abstract: There are provided ink jet printing method and apparatus which assure that reciprocable printing can be realized at a high speed without any deterioration of a quality of printing. When an image is printed on a printing medium by using a multi-orifice head of which the ink ejecting direction relative to an opening surface is inclined in the return scanning direction, a scanning speed of the return scanning direction is delayed from the scanning speed in the reverse forward direction, an offset distance between a main dot and a satellite at the time of the return scanning is suppressed to be small, and in the case that printing is performed by reciprocable scanning, the satellite is received in the main dot not only during the forward scanning but also during the return scanning.

Abstract: A recording scan is performed through a relative reciprocation of color recording heads on a recording material. The recording heads can record with higher recording density than that of input image date. A plurality of pixels (2.times.2)are formed for each pixel of input image data. A mixed color image is recorded by multiple scans of the recording heads, in such a manner that pixels thereof (2.times.2) are not subjected to superposition of ink of two colors or more during a scan of the recording heads. Thus, it is possible to prevent an occurrence of variations in mixed color, and to record a high quality color image without increasing a recording time. Further, an amount of ink of one color may be reduced when recording a second one of the scans.

Abstract: This invention relates to an ink jet recording apparatus and a recording method for recording images of high dignity with the amount of ink placed per unit area of a recording medium being always kept constant even if the resolvability when recording is effected changes. When the amount of ink of an ink droplet discharged from a recording head is constant (25 pl), the average number of recorded dots conformity to the resolvability is found on the basis thereof, and the number of recordable dots is found from this average number of dots. The difference between this number of actually recorded dots and the average number of recorded dots is adjusted by reducing the value of recording data in advance.

Abstract: An information transmitting mechanism is described for transmitting information of an ink tank of an ink jet recording apparatus to a controller thereof. The recording apparatus performs recording by scanning a carriage on which a recording head and the ink tank are mounted; the ink tank is removably mounted to said recording head. The information transmitting mechanism includes the ink tank and the recording head; in particular, the ink tank has an information mark. The recording head is connected to the ink tank and has a signal terminal making a signal connection with the ink tank and with the controller of the apparatus. The content of the information mark is transmitted to the controller through the signal terminal. The information relating to the ink tank is transmitted to the controller through the head terminal and through the carriage terminal. The information relating to the recording head is transmitted to the controller through the carriage terminal.

Abstract: A plurality of thin image data are generated based on desired image data. A single region on a recording medium is scanned a plurality of number of times on the basis of the plurality of thin image data, thereby recording the thin images a plurality of number of times. The scan interval in this case is set to be an interval equal to or longer than a required minimum interval, which does not cause deterioration of image quality due to blurring. Furthermore, the interval is properly changed according to the print duty, environmental condition, or the like.

Abstract: By ejection from each ejection opening of a liquid ejecting head, predetermined lengths of ruled line patterns are formed in order, and by ejection of an ink from an ink ejecting head, a solid pattern is printed overlaying the ruled line patterns of the liquid. In this case, the portion corresponding to the ejection opening through which the liquid cannot be ejected may be a different printing density in comparison with another portion where the liquid and the ink are overlaid. By this, non-ejection failure at the ejection opening can be detected. Therefore, in an ink-jet printing apparatus employing a head for ejecting the liquid for making a coloring agent in the ink insoluable for enhancing water resistance, the ejection condition of the head can be successfully detected.

Abstract: A color ink jet printing apparatus including a single suction mechanism having a capping member designed to cap any one of the printheads of the apparatus and carrying out a suction recovery of that capped printhead. A plurality of additional caps which are not associated with the suction mechanism are provided for capping the printhead. Various printing moving schemes are devised to provide quick and efficient positioning of selected printheads opposing the suction mechanism to speedily service that printhead.