CN214646904U

CN214646904U - Thermal print head

Info

Publication number: CN214646904U
Application number: CN202022741288.1U
Authority: CN
Inventors: 王共海; 刘善政; 王立华
Original assignee: Hunan Kaitong Electronic Co ltd
Current assignee: Hunan Kaitong Electronic Co ltd
Priority date: 2020-11-24
Filing date: 2020-11-24
Publication date: 2021-11-09
Anticipated expiration: 2030-11-24

Abstract

The utility model discloses a thermal printing head belongs to the thermal printing field. The printing device comprises an insulating substrate, a ground coat layer, an electrode layer, a heating resistor and a protective layer, wherein the ground coat layer is arranged on the surface of the insulating substrate, the electrode layer is arranged on the surface of the ground coat layer and comprises a single electrode and a common electrode, the heating resistor is arranged between the single electrode and the common electrode along a main printing direction, one end of the common electrode is connected with the heating resistor along an auxiliary printing direction, and the other end of the common electrode is used for being connected with a printing power supply; one end of each single electrode is connected with the heating resistor along the main printing direction, the other end of each single electrode is connected with the control panel, protective layers cover the surfaces of the heating resistor, the single electrodes and the common electrode, and each protective layer comprises a transparent glass glaze layer and a silicon carbide protective layer.

Description

Thermal print head

Technical Field

The utility model relates to a thermal printing field specifically is thermal printing head.

Background

For a thermal printer, the wording can be understood as: an apparatus for printing by chemical reaction of sensitive elements in a heated state. With the development of the information industry, thermal printers operating in a non-impact manner have many advantages such as low noise, low power consumption, high reliability, high speed, clear printing, convenience in use, and long service life, and are widely used in various fields such as portable terminal printing, electronic cash register (POS) printing, medical ticket printing, facsimile machine output, plate making printing, sticker printing, and bill printing. The Thermal Printer Head (TPH) is the core component of the thermal printer, and the working principle of the TPH is that information collected by a host computer is applied to a heating resistor in a pulse form after being driven by a circuit, and the heating resistor generates Joule heat and directly transfers the Joule heat to the thermochromic thermal printing paper (or transfers the Joule heat to the common paper through a thermal transfer ribbon) in a conduction way, so that image characters are recorded quickly. The thermal print head is an electrothermal conversion component, and its main functional element heating substrate mainly consists of several portions of heat-insulating layer, glaze layer, electrode layer, heating resistor and protective layer. In a working state, the thermal printing head and the thermal printing paper are contacted with each other at a certain pressure intensity, serious abrasion is experienced after long-term use, in order to ensure that the thermal printing head can normally work and prolong the service life, a protective layer is required to be arranged on the surface of a heating substrate, the protective layer in the traditional technology is usually a layer of transparent glass, but the service life of the thermal printing head is short due to the fact that the general transparent glass is low in hardness, high in surface roughness, large in friction coefficient and poor in wear resistance; in addition, the poor thermal conductivity of the transparent glass affects the heat transfer of the heating resistor, and it is difficult to ensure the printing effect of the printing head. Therefore, how to increase the strength, wear resistance, smoothness and thermal conductivity of the protective layer of the thermal print head is an urgent problem to be solved.

SUMMERY OF THE UTILITY MODEL

Technical problem to be solved

The hardness that uses transparent glass to be the protective layer to current thermal print head is low, the roughness is high, and coefficient of friction is big, wearability and heat conductivity are poor, lead to thermal print head to print the effect poor, problem that life is short, the utility model provides a thermal print head has improved smoothness, wearability and the heat conductivity of protective layer, has improved thermal print head and has printed the effect, has improved its life.

(II) technical scheme

In order to achieve the above object, the utility model provides a following technical scheme:

providing a thermal printing head, which comprises an insulating substrate, a ground coat layer, an electrode layer, a heating resistor and a protective layer, wherein the ground coat layer is arranged on the surface of the insulating substrate, the electrode layer is arranged on the surface of the ground coat layer, the electrode layer comprises a single electrode and a common electrode, the heating resistor is arranged between the single electrode and the common electrode along a main printing direction, one end of the common electrode is connected with the heating resistor along an auxiliary printing direction, and the other end of the common electrode is used for being connected with a printing power supply; one end of each single electrode is connected with the heating resistor along the main printing direction, the other end of each single electrode is connected with the control panel, protective layers cover the surfaces of the heating resistor, the single electrodes and the common electrode, and each protective layer comprises a transparent glass glaze layer and a silicon carbide (SIC) protective layer.

Preferably, the silicon carbide (SIC) protective layer is plated on the surface of the transparent glass glaze layer away from the heating resistor by means of vacuum sputtering.

Further, the silicon carbide (SiC) protective layer covers all the transparent glass glaze layers, and the printing medium is only in direct contact with the silicon carbide (SiC) protective layer during operation.

Further, the electrode layer material is selected from gold or silver.

(III) advantageous effects

The utility model discloses a beneficial effect of this scheme lies in: above-mentioned thermal print head, its generate heat the protective layer of base plate surface and thermal printing paper contact and increased silicon carbide (SIC) protective layer, silicon carbide (SIC) protective layer surface smoothness is high, the wearability is good, the heat conductivity is strong, can resist the wearing and tearing of inferior printing medium when printing, can quick effectual realization heat transfer, the effectual thermal print head that has strengthened prints effect and life.

Drawings

FIG. 1 is a schematic diagram of a thermal printer.

Fig. 2 is a structure diagram of each layer of the present invention.

FIG. 3 is a schematic diagram of connection between a single electrode and a common electrode in an electrode layer and a heating resistor.

In the figure: 1 insulating substrate, 2 ground coat, 3 electrode layers, 4 transparent glass glaze layers, 5 black glass layers, 6 heating resistors, 7 common electrodes, 8 single electrodes, 9 platen rollers, 10 thermal print heads and 11 thermal paper.

Detailed Description

The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, rather than all embodiments, and all other embodiments obtained by a person of ordinary skill in the art without creative work belong to the protection scope of the present invention based on the embodiments of the present invention.

The first embodiment is as follows:

as shown in fig. 1 to 3, a thermal printer is an apparatus for printing by controlling a heating resistor to transfer heat to a predetermined position on thermal printing paper to cause a chemical reaction of a sensitive element at the position, thereby rapidly recording an image and characters. Therefore, in order to realize heat conduction, in the operating state of the thermal printer, the thermal print head 10 and the thermal printing paper 11 are in contact with each other at a certain pressure at the position of the heat generating substrate of the thermal print head, and the position will experience serious abrasion after long-term use, in order to ensure the normal operation and prolong the service life of the thermal print head, the embodiment provides the thermal print head, the bottom layer uses the insulating substrate 1, a ground coat layer 2 is arranged on the surface of the insulating substrate 1, an electrode layer 3 is arranged on the surface of the ground coat layer, the electrode layers comprise a single electrode 8 and a common electrode 7, a heating resistor 6 is arranged between the single electrode 8 and the common electrode 7 in the main printing direction, one end of the common electrode 7 is connected with the heating resistor 6 along the sub-printing direction, and the other end of the common electrode 7 is used for being connected with a printing power supply; the one end of single electrode 8 along main direction of printing with firing resistor 6 is connected, the 8 other ends of single electrode are connected with the control panel firing resistor 6, the surface covering of single electrode 8, common electrode 7 have the protective layer, the protective layer includes transparent glass glaze layer 4 and carborundum (SIC) protective layer 5, carborundum (SIC) protective layer 5 plates transparent glass glaze layer 4 through vacuum sputtering's mode and keeps away from on the one side of firing resistor 6, and during the printing, firing resistor 6 receives pulse signal and produces joule heat and sees through carborundum (SIC) protective layer 5 with the conduction mode and transmits for being pressed the thermal printing paper 11 of paper cylinder 9 extrusion contact on the base plate that generates heat, production printing effect. Because silicon carbide (SIC) protective layer 5 smoothness is high, the wearability is good, the heat conductivity is strong, can resist when printing with thermal printing paper 11's wearing and tearing to can effectual realization heat transfer fast, the effectual thermal printing head that has strengthened prints effect and life.

The present invention and its embodiments have been described above schematically, and the description is not limited thereto, and what is shown in the drawings is only one of the embodiments of the present invention, and the actual structure is not limited thereto. Therefore, if the person skilled in the art receives the teaching of the present invention, without departing from the inventive spirit of the present invention, the person skilled in the art should also design the similar structural modes and embodiments without creativity to the technical solution, and all shall fall within the protection scope of the present invention.

Claims

1. The thermal printing head comprises an insulating substrate, a ground coat layer, an electrode layer, a heating resistor and a protective layer, wherein the ground coat layer is arranged on the surface of the insulating substrate, the electrode layer is arranged on the surface of the ground coat layer and comprises a single electrode and a common electrode, the heating resistor is arranged between the single electrode and the common electrode along a main printing direction, one end of the common electrode is connected with the heating resistor along an auxiliary printing direction, and the other end of the common electrode is used for being connected with a printing power supply; the one end of individual electrode along main direction of printing with heating resistor is connected, the individual electrode other end is connected with the control panel heating resistor, individual electrode, common electrode's surface covers has protective layer, its characterized in that: the protective layer comprises a transparent glass glaze layer and a silicon carbide protective layer.

2. The thermal print head of claim 1, wherein: and the silicon carbide protective layer is plated on one surface of the transparent glass glaze layer, which is far away from the heating resistor, in a vacuum sputtering mode.

3. The thermal print head of claim 1, wherein: the silicon carbide protective layer covers all the transparent glass glaze layers.

4. A thermal print head according to any one of claims 1 to 3, wherein: the electrode layer material is selected from gold or silver.