Incremental printing of symbolic information – Ink jet – Controller
Patent
1996-02-21
2000-11-14
Barlow, John
Incremental printing of symbolic information
Ink jet
Controller
347133, 347195, 347196, B41J 29393
Patent
active
061459518
ABSTRACT:
An apparatus and method for correcting printing characteristics of a full-line printhead, and producing a high-printing quality printhead at high manufacturing yield, a corrected printhead by this apparatus, and a printer employing this printhead are disclosed. According to this method, an image is printed on a printing medium by using double pulses obtained based on fluctuation of resistance of each printing unit of a printhead, and a reference OD value is determined from an OD value histogram of the printed image. A preheating pulse width is selected, based on OD values of n printed images obtained by changing the preheating pulse width n times and the reference OD value, such that an OD value on each printing element is equal or close to the reference OD value. For example, assuming that the reference value is 0.43, a preheating pulse width on printing element No. 3 is 0.875.mu. sec.
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Hayasaki Kimiyuki
Inaba Masaki
Barlow John
Canon Kabushiki Kaisha
Hallacher Craig A.
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