Abstract: An ink-drop generator (33) of an ink-jet printer is characterized in that a resonating ink cavity (6) from which the ink is supplied via a nozzle plate (39) onto a printing substrate has its lateral walls (7, 8, 9, 10) perpendicular to the nozzle plate (39). The end-nozzles may thus be positioned adjacent to the walls (9, 10) of the cavity (6).

Abstract: Process for modification of the position at which electrically-charged ink droplets arrive on a substrate (27), the droplets being charged by charge electrodes (20) connected to a voltage generator, the paths of the droplets being affected by the action of deviation electrodes (23, 24) that deviate the droplets depending on the value of their electrical charge, between N positions defining a frame obtained by a burst of droplets in the form of a straight segment approximately parallel to an X direction along which the substrate advances, process characterized in that an additional random voltage equal to a fraction less than 1 of the difference between the nominal voltages to be applied to the charge electrodes for each droplet and for one of the two immediately adjacent droplets in the frame, is applied in addition to a nominal voltage to be applied to each droplet charging means.

Abstract: Process for compensation of mechanical defects in an ink jet printer in which the ink viscosity, the jet velocity, the distance at which the ink jet is broken into droplets and the phase are independently servocontrolled to respect set values, process according to which the droplet arrival position is compared with a reference position, and mechanical defects are compensated by varying the electrical charge on the droplets. The invention also relates to a printer equipped with checking and servocontrol means so that compensation according to the process can be applied. The mechanical assembly of the printer will thus be simplified.

Abstract: Process for compensation of a defect in the advance of a print substrate by modifying the arrival position of ink droplets with a variable electrical charge on the substrate (27), these droplets being charged in a variable and sequential manner, the paths of the droplets being affected by deviation electrodes (23, 24) deviating the droplets to one of N positions defined by their row j (1≦j≦N), the N positions defining a frame obtained by a burst of droplets in the form of a straight line segment parallel to an X direction along which the substrate advances.

Abstract: Process for modification of the position at which electrically-charged ink droplets arrive on a substrate (27), the droplets being charged by charge electrodes (20) connected to a voltage generator, the paths of the droplets being affected by the action of deviation electrodes (23, 24) that deviate the droplets depending on the value of their electrical charge, between N positions defining a frame obtained by a burst of droplets in the form of a straight segment approximately parallel to an X direction along which the substrate advances, process characterized in that an additional random voltage equal to a fraction less than 1 of the difference between the nominal voltages to be applied to the charge electrodes for each droplet and for one of the two immediately adjacent droplets in the frame, is applied in addition to a nominal voltage to be applied to each droplet charging means.

Abstract: Process for compensation of a defect in the advance of a print substrate by modifying the arrival position of ink droplets with a variable electrical charge on the substrate (27), these droplets being charged in a variable and sequential manner, the paths of the droplets being affected by deviation electrodes (23, 24) deviating the droplets to one of N positions defined by their row j (1≦j≦N), the N positions defining a frame obtained by a burst of droplets in the form of a straight line segment parallel to an X direction along which the substrate advances, characterized in that:

Abstract: Process for compensation of mechanical defects in an ink jet printer in which the ink viscosity, the jet velocity, the distance at which the ink jet is broken into droplets and the phase are independently servocontrolled to respect set values, process according to which the droplet arrival position is compared with a reference position, and mechanical defects are compensated by varying the electrical charge on the droplets. The invention also relates to a printer equipped with checking and servocontrol means so that compensation according to the process can be applied. The mechanical assembly of the printer will thus be simplified.

Abstract: An ink-drop generator (33) of an ink-jet printer is characterized in that a resonating ink cavity (6) from which the ink is supplied via a nozzle plate (39) onto a printing substrate has its lateral walls (7, 8, 9, 10) perpendicular to the nozzle plate (39).

Abstract: This invention relates to a continuous multicolor ink jet press comprising a substrate driven by a motor and passing under at least one print head associated with a sensor and supplied by an ink circuit, a synchronization circuit, connected to a process controller and a position encoder placed on the substrate drive motor transmitting a signal to the synchronization circuit, this encoder being a high resolution position encoder. A printing system is located upstream of the printheads and which prints marks regularly on the substrate. These marks are detected by the sensor associated with the printheads.

Abstract: An apparatus for the production and repair of color filters from a substrate on which is deposited a regular network of color blocks. The apparatus includes a very stable Table 23 supporting the substrate and a printing head 25 using a high resolution, continuous ink jet with one or more nozzles supplied by an ink circuit. A mechanical motor driven device 28 provides for the relative displacement of the substrate 24 with respect to the printing head 25 and a measuring device 300 measures the position of the Table 23 by laser interferometry or by optical encoding. Ink positioning system 34 positions ink droplets using microscopic optics and a system inspects and controls the complete apparatus.

Abstract: A device for controlling and regulating a continuous ink jet printer wherein a jet (J) is fractionated into droplets charged in a charge electrode (6) and which then pass between deflection electrodes, a sensor (8) is provided which includes a conductor element (8c) having two parts which are symmetrical with respect to the trajectory of the droplets. The device includes a circuit (9) which determines and processes the first I(t) and second J(t) derivatives with respect to the time of the charge induced in the conductor element (8c) by charged droplets (Gc) in order to determine their speed. The device includes means for regulating the speed of droplets and means for regulating the ink quality.

Abstract: A high resolution printing method is disclosed, implemented in a printer in which a continuous ink jet is broken up into drops (G) in a charging electrode (6) where they are selectively charged electrostatically, said drops then pass between deflection electrodes (9), the appearance of a satellite drop (Sn) from a main drop is caused by application of an appropriate voltage in the charging electrode during formation of said main drop and the coalescence of a satellite drop thus formed intended for printing with the following main drop is prevented, also by application of a voltage to the charging electrode during the formation of said main drop.