Incremental printing of symbolic information – Thermal marking apparatus or processes – Density control
Reexamination Certificate
2007-02-27
2010-06-29
Tran, Huan H (Department: 2861)
Incremental printing of symbolic information
Thermal marking apparatus or processes
Density control
C347S194000
Reexamination Certificate
active
07746367
ABSTRACT:
The thermal printer of the present invention is a thermal printer for printing on a print medium by thermally transferring an ink ribbon by means of a thermal head, wherein the thermal printer comprises a density controller for keeping the print density of the thermal head low in low-temperature control for raising the print density at low temperatures. The density controller comprises a density calculator for calculating a density evaluation value by finding an average gradation value of print data for each of a plurality of dots included in the predetermined region, a comparator for comparing the calculated density evaluation value with a predetermined value, and an adjuster for adjusting, on the basis of this comparison result, the print density in driving and printing with the thermal head to a low value for print data of high gradation exceeding a predetermined gradation value in print data on a printed line when the density evaluation value exceeds a predetermined value. The printing of each dot by the thermal head is controlled on the basis of the adjusted print density. Even if low temperature control is carried out by the thermal head when the ambient temperature is low, the occurrence of ink ribbon wrinkling due to the effect of print density is suppressed.
REFERENCES:
patent: 4-358853 (1992-12-01), None
patent: 7-76120 (1995-03-01), None
patent: 2002-254687 (2002-09-01), None
Machine translation of JP 07-076120, published on Mar. 1995.
International Search Report of PCT/JP2007/053616, date of mailing Mar. 27, 2007.
Notification of Transmittal of Translation of the International Preliminary Report on Patentability (Form PCT/IB/338) of International Application No. PCT/JP2007/053616 mailed Sep. 12, 2008 with Forms PCT/IB/373 and PCT/ISA/237.
Citizen Holdings Co. Ltd.
Tran Huan H
Westerman Hattori Daniels & Adrian LLP
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