Incremental printing of symbolic information – Ink jet – Controller
Patent
1998-08-03
2000-06-20
Barlow, John
Incremental printing of symbolic information
Ink jet
Controller
358406, 358504, B41J 29393
Patent
active
060769157
ABSTRACT:
In various methods, image registration variations among test patterns are used to calibrate misalignment among one or more printheads, paper advance distance, different portions of an inkjet printhead, or bidirectional printhead alignment. A set of test patterns are printed. Each pattern includes a reference portion and a varying portion. The varying portion is changed from pattern to pattern in a manner for testing a parameter being calibrated. An optical sensor scans each test pattern. The parameter setting for the lest pattern having the highest reflectance (i.e., most blank space) is selected as the calibrated parameter value.
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European Search Report dated Dec. 13, 1999 for related European patent application EP99306098.7-2304, filed Aug. 3, 1998.
Donovan David H.
Gast Paul David
Gil Miquel Antoni
Gros Xavier
Hickman Mark S
Barlow John
Hallacher Craig A.
Hewlett--Packard Company
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