Thermosensitive head

Abstract

The invention provides a thermal head which can execute high-quality printing by preventing foreign matters such as dust from accumulating at the printing time at a part where a thermal insulating layer is formed. The thermal insulating layer 2 of the thermal head has a surface partially projected thereby forming a projecting part 2a with a vertex part. Heating elements 3a are set at the surface of the projecting part 2a. A cross sectional shape of the projecting part 2b in a direction orthogonal to the arrangement direction of heating elements 3a has an inclined face 2c formed at a face side 2b. The one face side 2b is formed lower than the other face side 2d. The projecting part 2a is formed to have a height from the one face side 2b of 5-50 [mu]m.

Description

technical field [0001] The present invention relates to a thermal head for a thermal printer, in particular to a thermal head capable of preventing print quality degradation due to adhesion of dust and the like. Background technique [0002] Generally, as a thermal head installed on a thermal printer, a plurality of heating elements composed of heating resistors are arranged in a row on the substrate, and each heating element is selectively energized and heated according to the printing information, so that Melt the ink on the ribbon, heat transfer on plain paper or OHP paper, or print in color on thermal printing paper, and print on various recording media. [0003] This existing thermal head, generally, such as image 3 As shown, an insulating layer 12 is formed on the heat-dissipating substrate 11, and on the insulating layer 12, a protruding portion 12b is formed at a predetermined height in the vicinity of one end 11a of the right end of the substrate 11. [0004] In a...

AI Technical Summary

Problems solved by technology

[0013] However, in the conventional thermal head, recesses 12c, 12d are formed on the left and right slopes of the raised portion 12b of a given height on the surface of the insulating layer 12.

[0014] Therefore, when the lowered thermal head 11 moves in the arrow A direction while printing the ink of the printing ribbon 18 on the printing paper 19 at the position of the platen cylinder (not shown in the figure), On the left side of the drawing of the heating element 13a, because the convex portion 12b in the moving direction of the arrow A will be in the concave 12c on the upstream side, it is easy to accumulate foreign matter such as fine dust adhering to the ink ribbon 18

[0015] When such a foreign matter such as dust is retained in the depression 12c on the left side of the drawing of the heating element 13a, white lines will be left on the image printed on the printing paper 19 due to the influence of the dust, resulting in Reduced print quality

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