Patent ID: 6215510
Filing Date: 2001-04-10
Classification: B41J

Abstract:
A thermal head for thermally perforating a stencil material in an imagewise pattern to make a stencilcomprising an electric heater strip extending in a first direction, anda plurality of first and second electrodes which are alternately disposed spaced from each other in the first direction and extend across the heater strip in contact therewith,the parts of the heater strip between adjacent first and second electrodes forming heater elements, and the thermal head being moved along the stencil material in a second direction intersecting the first direction while selectively energizing the heater elements through the first and second electrodes, wherein the improvement comprises thatan electrical insulating layer is disposed between the first and second electrodes and the heater strip at least on one side of the heater strip so that the width of the electrical contact area between the first and second electrodes and the heater strip becomes smaller than the width of the heater strip thereof.