Thermal printer and device and method for measuring resistance o

Details Thermal printer and device and method for measuring resistance o Thermal printer and device and method for measuring resistance o

1993-08-31

1995-11-21

Wieder, Kenneth A.

Electricity: measuring and testing

Impedance, admittance or other quantities representative of...

Lumped type parameters

324658, 347211, G01R 2702, B41J 235

Patent

active

054690684

ABSTRACT:
A resistance measuring method and device for a thermal head, and a thermal printer using the resistance measuring device. From among a plurality of parallel connected heating elements of the thermal head, the heating element whose resistance is to be measured is set ON, while other heating elements are set OFF. A capacitor connected in parallel to the heating elements is discharged through the conductive one of the heating elements, while being disconnected from a power supply for charging the capacitor, and a discharge time required to discharge the capacitor down to a predetermined voltage level is measured. A resistance value of the heating element is calculated based on the measured discharge time.

REFERENCES:
patent: 4409600 (1983-10-01), Minowa

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