Patent ID: 6452621
Filing Date: 2002-09-17
Classification: B41C,B41J

Abstract:
A thick film thermal head for making a stencil by thermally perforating a stencil material comprisingan electrical insulating substrate and a glaze layer superposed on a heat radiating plate in this order, a resistance heater formed on the glaze layer to continuously extend in a main scanning direction, a plurality of electrodes of at least two lines which extend in a direction intersecting the main scanning direction in contact with the resistance heater and are alternately arranged in the main scanning direction, and a protective layer which covers exposed part of the resistance heater and the electrodes, wherein the improvement comprises that the resistance heater is not smaller than 1 &mgr;m and not larger than 10 &mgr;m in thickness, the space between each pair of adjacent electrodes in the main scanning direction is not smaller than 20% and not larger than 60% of the center distance between the adjacent electrodes, and the length in the sub-scanning direction of the resistance heater at the portion between each pair of adjacent electrodes is not smaller than 100% and not larger than 250% of the center distance between the adjacent electrodes.