To record a multi-valued image by an ink-jet head, an ink droplet is jetted from a recording element (nozzle) for the number of times corresponding to the density of a pixel to be reproduced. Accordingly, the pixel data to determine the number of ink-jet operation is expressed by a plurality of bits and the data of each bit are transferred to a plurality of shift registers at a time. Each shift register has storage capacity based on bit data corresponding to the number of recording elements of a recording head. When data transfer is completed, a driving signal is supplied to the recording head. The driving signals are counted and each recording element is driven based on the count result and the data stored in each register.
An ink jet printer comprising a print pattern storage device for storing the input print pattern data and sequentially outputting the stored data in conjunction with the relative movement of the print head, and a separate preliminary ejection data generator for causing ink droplets to be ejected from plural print elements of the print head simultaneously, the ink jet printer further comprises a selecting device for selecting the output from either the print pattern storage device or the preliminary ejection data generator, and ejecting ink droplets from the plural print elements according to the selected output.
This invention is to provide a printhead capable of printing at a higher speed even when the number of printing elements is large, a printing apparatus using this printhead, a printhead cartridge, and a printing element substrate. For this purpose, print signals necessary for driving M printing elements belonging to each of N divisional blocks and a select control signal necessary for block selection are transferred by inputting print signals corresponding to L (L<M) printing elements serially from a first signal line by using a clock signal and inputting print signals corresponding to the remaining (M-L) printing elements and a corresponding select control signal serially from a second signal line by using the same clock signals.
An ink jet printer has a line head having heating elements (121d) for ejecting ink droplets from nozzles, in which the plurality of heating elements (121d) are arrayed in a direction substantially perpendicular to the paper feed direction. In the line head, the plurality of heating elements (121d) are divided into a plurality of blocks, with each block consisting of a predetermined number of spatially arrayed heating elements of the plurality of heating elements (121d) corresponding to the plurality of nozzles, and a phase signal PH is sequentially supplied to a set of heating elements (121d) simultaneously driven over the respective blocks, thus sequentially driving the respective heating elements (121d) by each set as a unit in a time-divisional manner. Thus, the ink jet printer can reduce the positional shift of dots on the paper and can reduce the instantaneous maximum dissipation power in time-division drive.
An ink jet printer has a line head having heating elements (121d) for ejecting ink droplets from nozzles, in which the plurality of heating elements (121d) are arrayed in a direction substantially perpendicular to the paper feed direction. In the line head, the plurality of heating elements (121d) are divided into a plurality of blocks, with each block consisting of a predetermined number of spatially arrayed heating elements of the plurality of heating elements (121d) corresponding to the plurality of nozzles, and a phase signal PH is sequentially supplied to a set of heating elements (121d) simultaneously driven over the respective blocks, thus sequentially driving the respective heating elements (121d) by each set as a unit in a time-divisional manner. Thus, the ink jet printer can reduce the positional shift of dots on the paper and can reduce the instantaneous maximum dissipation power in time-division drive.
A printing apparatus having a plurality of printing devices (e.g., printheads or firing chambers) that permits registration of the printing devices so as to achieve a uniform output of print ink. Logic that adjusts the length of a firing signal (which is related to drop size) and timing of a firing signal is disclosed.
