thermal print head

Abstract

The invention relates to the technology of fax machines or printers, and in particular relates to a thermo-sensitive printing head. The thermo-sensitive printing head is provided with a conductive metal base with a hole, wherein an insulating base plate is arranged on the metal base, a circuit graph is formed on the surface of the insulating base plate, a heating resistor body layer capable of generating joule heat is arranged on the insulating base plate along with the direction of a record width, an insulating protective film layer is covered on a insulating resistor, a conducive layer is covered on a part of or all the heating resistor body covered by the protective film layer, a hole part which corresponds to the hole of the metal base is arranged at an appointed position of a lead-out graph of the conductive layer on the insulating base plate, and the thermo-sensitive printing head is further provided with an assembling part coated with conductive substances on the surface of an insulating material of the assembling part, so that the charge accumulation on the conductive layer can be reduced, and the charge can be released outside through a configured external terminal, and therefore, not only can the electrostatic protection be carried out on a product of a static electricity generating source, but also the static electricity damage phenomenon prevention can be carried out on electric products adjoining to the product of the static electricity generating source.

Description

technical field [0001] The invention relates to the technical field of a fax machine or a printer, in particular to a thermal print head used in a fax machine or a printer. Background technique [0002] According to the patent announcement of Japanese patent "Japanese Patent Laid-Open No. 11-70682" figure 1 and paragraph [0019] (refer to Patent Document 1), a thermal print head is designed, the main feature of which is that an auxiliary electrode 9 is formed at the position of the field 2 between the individual electrode 4 and the common electrode 5, the One end of the auxiliary electrode 9 is connected to the conductive layer 8 through a via hole, and the other end is electrically connected to an external power supply applied with a negative potential through a flexible printed circuit board or the like. [0003] In addition, according to the patent notice of Japanese Patent Laid-Open No. 7-171981 figure 1 and paragraph [0016] (refer to Patent Document 2), a thermal print...

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Problems solved by technology

However, there is no detailed description on the prevention of electrostatic breakdown of the heating resistor 15, the prevention of electrostatic breakdown of the circuit board 12 arranged on the metal heat sink 10, and the wiring method of the ground wire 42.

[0007] In addition, according to the content described in Patent Document 3, silicon carbide materials with low resistivity impedance below 5000Ω·cm can be manufactured, but there is no detailed description of the method of using silicon carbide materials for grounding

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