Patent ID: 6347856
Filing Date: 2002-02-19
Classification: B41J

Abstract:
An ink-jet test pattern for determining printhead alignment error correction values for a multiple printhead ink-jet hard copy apparatus, said pattern comprising:on a single sheet of A-size print media, optically readable, individually spaced test pattern objects arranged to form a plurality of regions on said print media including a first region for acquiring reflectance value data indicative of x-axis error correction values, a second region for acquiring reflectance value data indicative of y-axis error correction values, a third region for acquiring reflectance value data indicative of error correction values in column-to-column spacing nozzle sets firing a same color ink from different nozzle columns of an individual printhead, a fourth region for acquiring reflectance value data indicative of primitive-by-primitive error correction values, and a fifth region for acquiring reflectance value data indicative of bidirectional, variable speed printing x-axis error correction values, such that said first, second, third, fourth, and fifth region in combination define alignment characteristics related to said multiple printhead alignment error correction values.