Abstract: An ink jet nozzle head including a channel plate defining a linear array of equidistanced nozzles and a plurality of substantially parallel ink channels communicating with an associated nozzle, a vibration plate disposed on the channel plate, a plurality of separately disposed block members, each containing a comb-like array of fingers which extend toward and engage the vibration plate, some fingers functioning as actuators for exerting mechanical pressure on ink contained in the ink channels which in turn expels ink droplets from the nozzle, at least one actuator being provided for each nozzle, and other fingers serving as support members for supporting the actuators at the vibration plate, where the reaction forces of the actuators are received, wherein each block comprises at least one actuator and at least one support member.

Abstract: The configuration of an ink inlet through which flows ink into a chamber for expulsion from the chamber by a thermal process is such that a vapor bubble generated by the thermal process to eject ink from the chamber expands to simultaneously occlude the inlet, thereby to separate the ink within the chamber from ink within a channel that is in fluid communication with the inlet. The separation eliminates a liquid path between the chamber and the channel so that substantially no ink is blown back into the channel as the bubble expands, thereby improving the thermal efficiency of the process.

Abstract: An ink-jet printing head and an ink-jet printing apparatus using the same, the ink-jet head comprising a piezoelectric element, a vibrating plate constituting a part of a pressure generating chamber communicating with a nozzle aperture, a lower electrode, a piezoelectric layer, and an upper electrode, wherein said vibrating plate in an area opposite to the vicinity of at least one end in the longitudinal direction of a piezoelectric active part which is an area in which said piezoelectric layer substantially drives said vibrating plate is convex on the reverse side to said piezoelectric element.

Abstract: In view of the fact that the ink viscosity is high when atmospheric temperature is low whereas the same is low when the atmospheric temperature is high, two types of driving signals are selectively applied to an actuator depending on the temperature so that ink droplets are ejected at a constant speed regardless of change in atmospheric temperature. Alternatively, when the temperature is below a predetermined value, ink droplets are ejected while heating the ink filling an ink channel. When the ink temperature is increased above the predetermined value, heating of the ink is halted.

Abstract: A liquid ink printer, depositing ink to form an image having a first resolution on a recording medium moving in a first direction, including a scanning carriage moving along a carriage rail in a scanning direction substantially transverse to the first direction. The printer includes a liquid ink printhead, coupled to the scanning carriage, including ink ejectors spaced at a second resolution, different from the first resolution, and a moving device, coupled to the printhead, moving the printhead in the first direction. The printhead is moved in the second direction to deposit a first swath of ink on the recording medium. The printhead is then moved in the first direction, and again moved in the second direction to deposit a second swath of ink on the recording medium, the first swath and the second swath overlapping.