Incremental printing of symbolic information – Thermal marking apparatus or processes – Having driving circuitry for recording means
Patent
1996-09-06
1998-01-06
Tran, Huan H.
Incremental printing of symbolic information
Thermal marking apparatus or processes
Having driving circuitry for recording means
347195, B41J 236, B41J 2355
Patent
active
057060452
ABSTRACT:
In a thermal printing apparatus, three consecutive image data items in the main scanning direction is sequentially extracted. When all the three image data items are at level 0 (indicating that no dot is printed) and at level 1 (indicating that a dot is printed), a printing density is determined to be 0 (indicating that no dot is printed) and 3 (indicating that a dot of the highest printing density is printed), respectively. When one of the three image data items is at level 1, the printing density is determined to be 1 (indicating that a dot of the lowest printing density is printed) when the printing density of the preceding printed pixel is any value other than 0. When one or two of the three image data items is or are at level 1, the printing density is determined to be 1 or 2 (indicating that a dot of an intermediate printing density is printed) according to the printing density of the preceding printed pixel. Thus, the printing apparatus is capable of printing image data without the degradation of the image quality, even when the image data whose resolution in the main scanning direction is higher than (e.g., three times as high as) that inherent to the apparatus is supplied.
REFERENCES:
patent: 4032977 (1977-06-01), Liao
patent: 4819008 (1989-04-01), Nagato et al.
Tsumura et al., "A Bi-CMOS Thermal Head Intelligent Driver with Density Controllers for Fulltone Rendition Printers", May 4-7, 272-75 Proceedings of the IEEE 1987 Custom Integrated Circuits Conference.
European Search Report, May 10, 1994.
Kabushiki Kaisha Toshiba
Tran Huan H.
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