Abstract: When ink droplets are ejected angled or splashed where a plurality of minute ink droplets are generated, angled or splashed ink clings on an electrode 401, 402 and increases the amount of electric current conducted therethrough, and so the defectiveness of ink ejection can be detected by monitoring the amount of the electric current. When the defectiveness of ink ejection is detected, ejection data D is retrieved and updates the ejection data D based on a condition register S, and set to a defective register E. When the defective register E has only one element that takes a condition value of 1 indicating defectiveness, the corresponding nozzle is identified defective. The restoring means reallocates dots, which have originally allocated to the defective nozzle, to neighboring nozzle.

Abstract: An ink jet recording device 10 includes a plurality of head modules 210 each formed with a plurality of nozzles for forming dots on a recording sheet 100. When the assembly of the head modules 210 has any positional error, recorded dots will shift to undesirable positions. However, the ink jet recording device 10 of the present invention adjust the dot forming positions to desirable positions in an electrical manner without actually and mechanically moving the head modules 210, both in directions perpendicular to and parallel with a nozzle line.

Abstract: A computer portion 201 of a printer includes a memory storing a printer driver software 201a and nozzle profile data 211. The printer driver software 201a includes a raster image processor (RIP) 203. When the RIP 203 receives document data 209, the RIP 203 converts the document data 209 into bitmap data 210 which is one dot/one bit data for 300 data/inch. Then, the nozzle data converting portion 204 converts the bitmap data 210 into driving data 212 based on the nozzle profile data 211. At this time, each bit of the bitmap data 210 is replaced by 16 bits. That is, the data amount is increased to 16 times of the bitmap data 210. Accordingly, fine control of ink ejection can be achieved.

Abstract: A color electrophotographic printer having a printing process which records a toner image of one color or two colors in a pixel by one exposure. The color electrophotographic printer includes a memory which stores exposure data corresponding to respective pixels of input data of an image, a photosensitive body and at least one charger which charges the photosensitive body. At least one exposing machine exposes respective pixels on the photosensitive body based on the exposure data and a developing machine develops toner of one color or two colors in the exposed respective pixels and forms a toner image. A transfer machine transfers the toner image onto a printing medium and a fixing machine having a belt which fixes the transferred toner image on the printing medium. The belt is controlled so that a relative speed difference occurs between the printing medium and the belt at a position along the belt at least when the developed toner of two colors in one pixel of an image of the printing medium is fixed.