Method and apparatus for controlling the area of a thermal print

Details Method and apparatus for controlling the area of a thermal print Method and apparatus for controlling the area of a thermal print

1981-08-10

1983-07-05

Pieprz, William

Typewriting machines

Typing by other than type-face or type-die

Thermal

346 76PH, 219216, B41J 320

Patent

active

043915353

ABSTRACT:
After discussion of a typical prior art thermal printer that is capable of providing precise printing of machine-readable characters on a thermal print medium through the use of an electrically-resistive thermal print element, a thermal model of the thermal print element and the heat transfer relationships between the thermal print element and its surrounding environment is constructed. From this thermal model, an equivalent electrical model is constructed which provides a signal representing the estimated temperature of the thermal print element. This signal is then used to control the exposure time of the thermal print (the time that is sufficient to raise the temperature of only an incremental area of the thermal print medium in uniform contact with the thermal print element to or above the threshold temperature) and to control the rest time of the thermal printer (the time following the exposure time that is sufficient to allow the temperature of the thermal print element to decrease to a value that will not result in additional exposure of the thermal print medium upon movement thereof).

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