A thermal print head for automatically removing carbon deposits and its manufacturing method

Abstract

The invention relates to a thermal printing head which comprises a ceramic substrate with ground coat, wherein an individual wire electrode, a common wire electrode and a heating element are formed on the substrate; the heating element protrudes in a main scanning direction; a dry film is attached to the substrate in an auxiliary scanning direction at different distances from a central position by taking the heating element as a center; a deeper groove is formed above the heating element after exposure development treatment; the deeper groove is coated with two layers of glass frit; the glass frit forms a grinding layer after being sintered; after the grinding layer is ground and evened, a sharp segment difference is formed at one end part of the grinding layer; a protective film is formed on the grinding layer and the wire electrodes; the part ranging from the individual wire electrode to the top end of the segment difference of the protective film is sputtered with SIC or is printed and sintered with thick-film conductive slurry to form a conductive layer. The thermal printing head is characterized in that the grinding layer is arranged above the heating element, the grinding layer is evened, the part, on a paper outlet side (namely the common wire electrode side), of the grinding layer is longer, and the larger segment difference is formed at the end part of the grinding layer; the conductive layer is arranged at the uppermost part to increase the segment difference; the structure can effectively push paper scraps from the heating element to the segment difference, thus realizing the thermal printing head capable of removing carbon deposit automatically.

Description

technical field [0001] The patent of the present invention relates to a thermal print head, especially a print head with a protruding and flattened structure of the heating element, a long life of a hard protective film, and effective elimination of the influence of carbon deposits and its manufacturing method. Background technique [0002] As we all know, the thermal print head includes a substrate made of insulating material, a base layer is made on the substrate, and then wire electrodes are formed on the surface of the substrate and the base layer. The wire electrodes are divided into individual electrodes and common electrodes. One end of the individual electrode is connected to the heating resistor body belt along the secondary printing direction, and the other end is connected to the control IC. One end of the common electrode is connected to the heating resistor body belt along the secondary printing direction, and the other end is connected to the wire The pattern i...

AI Technical Summary

Problems solved by technology

[0006] In the product of the aforementioned patent document 1, the opening width of the groove 6a is small, the depth is shallow, and a large amount of large carbon deposits are buried in the groove 6a, and the level difference of the groove disappears, so it cannot be fully brought out by the crimping of the recording medium. The problem of carbon accumulation;

[0007] In addition, the product recorded in Patent Document 2 first grinds the first protective layer 31 with low hardness, and then the second protective film 32 with high hardness forms a flat structure on the first protective film 31, but it has nothing to do with carbon deposition (recording medium) Records related to loss and powder falling during printing)

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