Typewriting machines – Typing by other than type-face or type-die – Thermal
Patent
1994-10-13
1999-04-06
Burr, Edgar
Typewriting machines
Typing by other than type-face or type-die
Thermal
40012011, 40012014, B41J 2315
Patent
active
058908196
ABSTRACT:
There is disclosed a thermal printer system in which variations in voltage (and the energy corresponding thereto) supplied to resistance elements of a print head are electronically compensated for. The voltage at the print head is monitored as a line of pixels is being printed pixel by pixel. Units of energy (corresponding to the measured voltage) which have been supplied to the resistance elements are counted, the counts are added together pixel by pixel to obtain cumulative totals and the cumulative totals converted into "compensating" numbers. An image data number for each pixel is compared to the corresponding compensating number, and a respective resistance element is pulsed (energized) a requisite number of times until the image data and compensating numbers match thus achieving a desired level of print density corresponding to the respective image data number. Since the overall print head temperature may change somewhat, depending on the duty cycle of the printing system, these temperature changes also are compensated for in a similar way.
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Burr Edgar
Eastman Kodak Company
Ghatt Dave A.
Sales Milton S.
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