Method and apparatus for correcting printhead, printhead corrected by this apparatus, and printing apparatus using this printhead
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Mar 28, 2000
Grant Date -
N/A
app pub date -
Oct 19, 1995
filing date -
Oct 28, 1994
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A method and apparatus for correcting a full-line printing head, 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. In the final stage of a semiconductor manufacturing process, the manufactured printhead is made to perform an experimental printing operation to print a predetermined dot pattern. The dot pattern is imaged by a CCD camera and image processing is executed to obtain an image signal. A plurality of pixels (4.times.32 dots) from among the pixels represented by the image signal are gathered together, the white or black pixels among these are counted and binarization is performed by comparing the count with a predetermined threshold value. Correction data for adjusting the amount of ink discharged from each nozzle of the printhead is generated based upon the binarized data, and the correction data is written in a memory provided in the printhead.
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