Incremental printing of symbolic information – Thermal marking apparatus or processes – Density control
Patent
1994-04-29
1997-05-27
Fuller, Benjamin R.
Incremental printing of symbolic information
Thermal marking apparatus or processes
Density control
347193, B41J 236, B41J 2365
Patent
active
056336705
ABSTRACT:
A thermal printer prints on a printing medium by heating a thermal print head which causes sublimation of a printing film at the areas corresponding to data or image to be printed. The sublimated dye on the printing film results in the data or image being printed on a supplied print medium. The types of print medium and printing film are sensed and the heating energy supplied to the print head is controlled in accordance with the types of medium and printing film used. The heat is controlled by varying the level of voltage supplied thereto, or by varying the duration of voltage supplied thereto, or by varying the repetitions of the printing operation, or by combinations of the latter. The type of medium used is sensed by sensing the light transmissivity or reflectivity of the medium. The type of printing film used is sensed by either sensing a bar code on the cartridge housing the film or by sensing a uniqueness of the shape of the cartridge housing the printing film. A micro-computer determines whether or not the sensed medium and film are suitable for a predetermined printing mode and, if the state is suitable, controls the performance of a printing operation according to a predetermined printing mode, and if the state is not suitable, displays the sensed information, to thereby inform the user and request the user to make a decision whether or not the printing is to proceed. When a print proceeding signal is input, the heating energy of a thermal print head is controlled so as to fit the predetermined mode.
REFERENCES:
patent: 4795999 (1989-01-01), Takahashi et al.
patent: 4890120 (1989-12-01), Sasaki et al.
patent: 4897670 (1990-01-01), Hasegawa et al.
patent: 5220352 (1993-06-01), Yamamoto et al.
Anderson L.
Fuller Benjamin R.
Samsung Electronics Co,. Ltd.
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