Thermal printer and thermal printing method

Details Thermal printer and thermal printing method Thermal printer and thermal printing method

2007-12-18

2007-12-18

Tran, Huan (Department: 2861)

Incremental printing of symbolic information

Thermal marking apparatus or processes

Density control

C400S120090

Reexamination Certificate

active

11235144

ABSTRACT:
The recording sheet is virtually divided into a recording area and an unrecording area in a main scan direction. Unrecording area printing heat energy is Esi calculated by subtracting printing heat energy Epi for a line to be printed from maximum printing heat energy Epmax for printing each line in the recording area. Common printing heat energy is calculated by dividing the unrecording area printing heat energy Esi by the number of the heating elements in the unrecording area. Virtual image data for each heating element is obtained by counting backward from the common printing heat energy. A recording sheet is printed based on the virtual image data and the real image data. Total printing heat energy is kept constant in each line, and there occurs no printing heat energy fluctuation on printing. Transport load fluctuation due to the printing heat energy fluctuation is suppressed to prevent an uneven density.

REFERENCES:
patent: 6091436 (2000-07-01), Kuwabara
patent: 6704036 (2004-03-01), Hayashi et al.
patent: 6801234 (2004-10-01), Nishimura
patent: 2002-67370 (2002-03-01), None

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