Incremental printing of symbolic information – Thermal marking apparatus or processes – Preheating
Patent
1994-11-08
1998-03-31
Fullen, Benjamin R.
Incremental printing of symbolic information
Thermal marking apparatus or processes
Preheating
B41J 238
Patent
active
057344116
ABSTRACT:
A method for making an image by means of a direct thermal imaging element, comprising on a support a thermosensitive layer incorporating an organic silver salt and a reducing agent contained in said thermosensitive layer and/or in other optional layers. The imaging element is imagewise heated by means of a thermal head having energizable heating elements. The activation of the heating elements is executed duty cycled pulsewise with the steps of preheating each heating element for a preheating time such that a preheat temperature in the imaging element is reached, which is just below the conversion temperature; selecting a pulse duty cycle such that a maximal density on the imaging element will be reached at the end of the maximal writing time; retrieving from a memory for each individual pixel an individual writing time related to a desired density on the imaging element; and energizing the heating elements with the selected pulse duty cycle for a time related to the retrieved individual writing time.
REFERENCES:
patent: 4327381 (1982-04-01), Amicel
patent: 4675695 (1987-06-01), Samuel
patent: 5087923 (1992-02-01), Bruch
Michielsen Joseph
Tilemans David
AGFA-GEVAERT
Anderson L.
Birch Richard J.
Fullen Benjamin R.
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