Abstract:
PROBLEM TO BE SOLVED: To enable the appropriate control of the flying velocity of an ejected ink droplet. SOLUTION: The ink jet printer is equipped with a nozzle opening through which an ink droplet is ejected, an ink chamber communicating with the nozzle opening, an ink supply passage for supplying an ink to the ink chamber and a piezoelectric element for expending/shrinking the ink chamber in conformity with an applied voltage. When performing a series of discharge steps including a first step (A-B) to expand the ink chamber and draw a meniscus in the nozzle opening into an ink chamber direction, a second step (B-C) to fill the ink chamber with the ink and move the meniscus into a nozzle opening direction and a third step (C-D) to contract the ink chamber to eject the ink droplet, a velocity at which the periodic position of the meniscus changes at the point of time when the third step starts, is appropriately selected, and thereby, the velocity at which the ink droplet to be ejected in the third steps airborne, is controlled.
Abstract:
PURPOSE:To enable the reduction of noise by multimodes and to contrive to facilitate the design by obtaining the reduction in astigmatic difference and the symmetry and stability of a far field pattern by a method wherein the titled device is enabled to have both properties of gain guide type and index guide type. CONSTITUTION:A current restricting region layer 17 serving as a photo absorbing layer having a smaller energy gap than a clad layer 15 and having the conductivity type different from that of the layer 15 is formed in the layer 15, a current concentration part of stripe form being formed by providing a lack part 17a of stripe form at the center of the layer 17 and thus constructing an internal stripe structure. The width W of the part 17a is selected at 3-5mum. Further, the difference in effective refractive index DELTAn(n-nS) when the refractive index of the part corresponding to the part 17a 9s (n), and the refractive index nS under the layer 17 is nS is 8X10 -2X10 .
Abstract:
PROBLEM TO BE SOLVED: To enable the identification of the type of an ink tank and the identification of the presence or absence of ink, and to reduce costs by providing commonality of components of both ink tanks. SOLUTION: An ink tank holder 31 houses the ink tank 11 with a container detecting electrode 23 which is brought into conduction with a liquid detecting electrode 21c, and the other ink tank with no container detecting electrode 23; the presence or absence of the ink in the positions of liquid detection electrodes 21 (21a-21c) is identified depending upon whether an electric current is carried by detection electrodes 41 (41a-41c); and a difference between the ink tank 11 and the other ink tank is identified depending upon whether an electric current is carried by an identification electrode 43. COPYRIGHT: (C)2005,JPO&NCIPI
Abstract:
PROBLEM TO BE SOLVED: To eliminate unevenness in printing density so as to prevent deterioration in image quality, by preventing the occurrence of a standing wave so as to prevent lack of the replenishment quantity of ink and the downsizing of an ink droplet. SOLUTION: When f represents a driving frequency for driving a heating resistor and Lfn represents the length of a common channel wherein the standing wave is generated in the ink, the actual length L of the common channel is set not to correspond to Lfn. When L represents the length of the common channel and Fn (a suffix n represents an nth-order harmonic index) represents the number of vibrations generated in the ink in common channel by the standing wave, the driving frequency f for actually driving the heating resistor is set not to correspond to Fn. COPYRIGHT: (C)2005,JPO&NCIPI
Abstract:
PROBLEM TO BE SOLVED: To solve the problem of a line head that a defect inherent to a nozzle is perceived easily as uneven density or streak in the print results. SOLUTION: An ejection controller 10 capable of ejecting ink drops of the same color and density from at least a plurality of arrays of nozzle groups N1 and N2 by controlling a head unit 11 arranged with a plurality of arrays of nozzle groups in the printing direction of a recording object comprises a section 10A storing information for identifying a nozzle group including a defective nozzle and information for specifying the position of a defective nozzle in the nozzle group, a section 10B for judging whether a destination nozzle of assigned gradation data is stored in the storage section 10A or not when print processing is performed, and a section 10C for assigning the gradation data to a nozzle at the same position as other nozzle group capable of ejecting an ink drop of the same color with the same density when the destination nozzle of assigned gradation data is stored in the storage section. COPYRIGHT: (C)2005,JPO&NCIPI
Abstract:
PROBLEM TO BE SOLVED: To provide a mechanism which enables an end user to check the causes for a functional deterioration at a high technical level without the use of a dedicated analytical tool, with regard to the deterioration of an image quality of a printer device. SOLUTION: In the printer device 20, a detection part 25 which detects the state variations of a monitored object; a memory unit 24 which stores a detection value of the detection part 25 and a use history of the monitored object as status information; and a main body control part 23 which makes the communication of the status information with an external computer 30, are provided. In addition, in the external computer 30, an external control part 33 which analyzes the status information acquired through the communication with the printer device 20 and a display part 31 which presents to the end user the causes for an abnormality presumed by an analytical process in the form of a text or in the state of a visual representation, are provided. Thus the detailed and concrete information is made available to the end user as a primary operator. COPYRIGHT: (C)2005,JPO&NCIPI
Abstract:
PROBLEM TO BE SOLVED: To prevent a prescribed liquid from being mixed in each nozzle array when a nozzle surface of a liquid ejecting head is cleaned. SOLUTION: This liquid ejector comprises: a liquid ejecting head (20) wherein a plurality of liquid ejecting nozzles (23) drilled in an array in the longitudinal direction of the nozzle surface 22 are formed in a plurality of arrays in a short-side direction; a cleaning member (24) which is provided in the longitudinal direction of the nozzle surface of the liquid ejecting head so as to wipe the nozzle surface; and a moving means (21) for relatively moving the cleaning member and the nozzle surface by bringing the cleaning member into contact with nozzle surface. The cleaning members (24) are each provided in such a manner as to correspond to each nozzle array among the plurality of arrays of liquid ejecting nozzles (23y-23k). The moving means (21) makes the respective cleaning members (24y-24k) correspond to the respective nozzle arrays (23y-23k) of the liquid ejecting head, and drives the cleaning members (24y-24k) so that only a nozzle surface area, wherein the nozzle array is positioned, can be cleaned. COPYRIGHT: (C)2005,JPO&NCIPI
Abstract:
PROBLEM TO BE SOLVED: To inexpensively produce a head module while enhancing high positional accuracy of a nozzle forming surface between head chips, and to eliminate leakage of liquid due to thermal stress. SOLUTION: The head module comprises a head chip 20 arranged with heating resistors 22, a nozzle sheet 13 on which nozzles 13a are formed, a barrier layer 12 for forming an ink liquid chamber 14, a module frame 11 for supporting the nozzle sheet 13 by being stuck thereto and provided with a hole 11b for arranging the head chip 20, and a buffer tank 15 for covering the head chip arranging hole 11b by being bonded to the surface of the module frame 11 opposite to the side being stuck to the nozzle sheet 13 and forming a common liquid channel 15a communicating with all liquid chambers 14 of the head chip 20 wherein the module frame 11 and the buffer tank 15 have a substantially equal linear expansion coefficient. COPYRIGHT: (C)2005,JPO&NCIPI
Abstract:
PROBLEM TO BE SOLVED: To provide a liquid discharging device which has a line head made compact. SOLUTION: The liquid discharging device is equipped with a discharging means which has a plurality of discharging parts arranged side by side straight in a specific direction. The discharging part includes a liquid chamber for storing a liquid to be discharged, a pressure generating element for pressing the liquid stored in the liquid chamber, and a discharge opening for discharging the liquid pressed by the pressure generating element from the liquid chamber. The liquid discharging device has a discharge control means which controls the supply of energy for driving the pressure generating element, drives the pressure generating element and controls a discharge direction of the liquid discharged from the discharge opening. The discharging means has a plurality of pressure generating elements set in one liquid chamber in at least one discharging part among the plurality of discharging parts which are arranged side by side straight in the specific direction and are set at an end part of the discharging means. COPYRIGHT: (C)2005,JPO&NCIPI
Abstract:
PROBLEM TO BE SOLVED: To suppress displacement (curving) of a nozzle array formed in a nozzle sheet of a printer head. SOLUTION: In the printer head provided with the nozzle sheet where nozzles 18 for discharging ink liquid drops are formed, a head frame for supporting the nozzle sheet, and a substrate member which has a heating resistor for heating ink and is bonded to the nozzle sheet, the head frame and the substrate member have nearly equal coefficients of linear expansion, and the nozzle sheet has a coefficient of linear expansion larger than the coefficients of linear expansion of the head frame and the substrate member. Openings 19 for joining electrodes of the substrate member are formed in the nozzle sheet, and moreover, openings, 20 are formed at the opposite side region via an array of the nozzles 18 to a region where the openings 19 are formed. The openings 20 are formed to have the opening area gradually reduced from an edge part of the head frame 2 towards a center part. COPYRIGHT: (C)2003,JPO