Automatic Temperature Compensation Circuit for Thermal Printers
Original Publication Date: 1987-Oct-01
Included in the Prior Art Database: 2005-Feb-02
A technique is described whereby an improvement is made to circuitry which controls the the drive signal to thermal printer print heads. The circuit provides automatic compensation to the drive signal, as temperature variables occur during thermal printing. In prior art, monitoring thermal print heads for temperature variations was usually accomplished through the use of thermistors and analog/digital (A/D) converter circuits, microcode routines and manual adjustments, as shown in Fig. 1. When the design speed of thermal printers increased, temperature variations became more critical, such that the circuit could not be depended upon to maintain the print (Image Omitted) quality required.