Apparatus and method for closed-loop, thermal control of printin

Details Apparatus and method for closed-loop, thermal control of printin Apparatus and method for closed-loop, thermal control of printin

1991-08-26

1992-07-21

Fuller, Benjamin R.

Recorders

Thermal recording

400120, G01D 1500

Patent

active

051327090

ABSTRACT:
The heating elements of a thermal printing head are respectively driven through drive transistors under the control of strobe pulses and are respectively provided with temperature control circuits, each such circuit including a sense resistor connected in series between the heating element and the drive transistor for sensing the current flow therethrough. Each control circuit has a flip-flop which is clocked by an associated strobe signal to turn on the corresponding drive transistor. The voltage drop across the sense resistor of each control circuit is amplified and compared to a reference level corresponding to a predetermined temperature, and when it exceeds the reference it resets the associated flip-flop to turn off the corresponding drive transistor.

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