Automatic Temperature and Humidity Compensation for Currents of a Thermal Print Head
Original Publication Date: 1985-Feb-01
Included in the Prior Art Database: 2005-Feb-18
The print and erase currents of a thermal print head used with a resistive ribbon to print are controlled in accordance with the relative humidity and the temperature of the ambient. The bond-to-peel delay time during the erase cycle also is controlled in accordance with the ambient temperature. In a thermal print head used with a resistive ribbon, the magnitude of each of the print and erase currents required to maintain a level of performance decreases logarithmically both with increasing relative humidity and with increasing ambient temperature. To improve print quality, it is desirable to adjust these currents as the temperature and/or the relative humidity changes.