Incremental printing of symbolic information – Ink jet – Controller
Patent
1995-10-19
2000-03-14
Gray, David M.
Incremental printing of symbolic information
Ink jet
Controller
347 19, B41J 2938, B41J 29393
Patent
active
060362979
ABSTRACT:
Disclosed are a method and apparatus for correcting a full-line printhead, which has a high printing quality, at a high yield, as well as a printhead corrected by this apparatus and a printer using this printhead. Monitoring units are provided to monitor an offset in connections of heater boards connected by a board arraying unit, a variation in the diameters, grooves and shapes of nozzles formed by a top-board machining unit which machines the top board, an offset in bonding between a base plate and the top board performed by a top-board bonding unit, a variation in the resistance value of each printing element measured by an electrical-characteristic measuring unit, and an unevenness of pixels printed by each of the printing elements inspected by a print inspection unit. Correction data is generated upon taking into account the degree of influence which these factors exert upon the printhead, and the correction data is written in an EEPROM provided within the printhead.
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Canon Kabushiki Kaisha
Gray David M.
Mahoney Christopher
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