Heating substrate for wear-resistant thermal printhead

Abstract

This utility model relates to the field of thermal printhead manufacturing technology, specifically a wear-resistant thermal printhead heating substrate with a reasonable structure, simple manufacturing, and effective protection of the silver COM electrode, thereby improving product reliability. A wear-resistant protrusion is provided on the paper output side of the heating resistor. The height of the wear-resistant protrusion is not less than the height of the glass glaze protective layer above the common COM electrode. The wear-resistant protrusion is disposed on the surface of the glass glaze protective layer and located between the heating resistor and the common COM electrode. A ceramic outer protective layer is also provided on the glass glaze protective layer on the surfaces of the heating resistor and the common COM electrode. Compared with the prior art, the beneficial effects are that the wear-resistant protrusion can effectively reduce the contact between the rubber roller and the protective layer on the surface of the silver common electrode on the paper output side, reducing the risk of film peeling off the protective layer on the surface of the silver common electrode; at the same time, the ceramic outer protective layer can further enhance the wear resistance of the glass glaze of the protrusion, significantly improving product reliability.

Description

Technical fields:

[0001] This utility model relates to the field of thermal printhead manufacturing technology, specifically a wear-resistant thermal printhead heating substrate with a reasonable structure, simple manufacturing, and effective protection of silver COM electrodes, thereby improving product reliability. Background technology:

[0002] As is well known, the key component of a thermal printhead is the heating substrate for the thermal printhead. The heating substrate includes an insulating substrate with a base glaze layer on its surface. A common electrode, individual electrodes, and a common COM electrode for achieving complete circuit connection of the electrodes are provided on the surface of the insulating substrate and the base glaze layer. A heating resistor is disposed between the common electrode and the individual electrodes along the main printing direction. One end of the common electrode is connected to the heating resistor, and the other end is used to connect to the power supply. One end of the individual electrode is connected to the heating resistor, and the other end is connected to the pad. To reduce power loss, the common electrode is usually made of silver, and its thickness is usually greater than 10μm. A glass glaze protective layer is provided on the surface of the heating resistor, individual electrodes, common electrode, and COM electrode. In existing thermal printhead products, due to product structure and process limitations, the glass protective layer on the surface of the silver common COM electrode is usually higher than the glass protective layer on the surface of the heating resistor. When the thermal printhead prints paper, the roller contacts the printhead surface, and the paper and roller generate significant pressure and friction on the common electrode surface. Because the silver common COM electrode is soft and has a large coefficient of thermal expansion, the glass enamel protective layer on the paper output side, especially the protective layer on the surface of the silver common COM electrode, is easily worn off. After the protective layer on the surface of the silver common COM electrode is damaged, the single-point energy is too high during printing, resulting in increased resistance and product damage. Summary of the Invention:

[0003] This invention addresses the shortcomings and deficiencies of existing technologies by proposing a wear-resistant thermal printhead heating substrate that is structurally sound, easy to manufacture, effectively protects the silver COM electrode, and thus improves product reliability.

[0004] This utility model achieves its purpose through the following measures:

[0005] A wear-resistant thermal printhead heating substrate includes an insulating substrate with a base glaze layer on its surface. Electrode wires, including a common electrode, individual electrodes, and a common COM electrode, are disposed along the main printing direction between the common electrode and the individual electrodes. One end of the common electrode is connected to the heating resistor, and the other end is connected to a power supply. One end of the individual electrode is connected to the heating resistor, and the other end is connected to a pad. An insulating glass glaze protective layer is provided on the surfaces of the heating resistor, individual electrodes, common electrode, and common COM electrode. The heating resistor has a wear-resistant protrusion on its paper output side, the height of which is not less than the height of the glass glaze protective layer above the common COM electrode. The wear-resistant protrusion is disposed on the surface of the glass glaze protective layer and located between the heating resistor and the common COM electrode. A ceramic outer protective layer is also provided on the glass glaze protective layer on the surfaces of the heating resistor and the common COM electrode.

[0006] The ceramic outer protective layer of this invention is formed by sputtering and has a thickness ranging from 1 to 5 μm. It is used to enhance the wear resistance of the wear-resistant boss and the glass glaze above the common COM electrode, thereby avoiding damage to the protective layer above the silver common COM electrode caused by friction of the printing medium, excessive single-point energy during printing, resulting in increased resistance and malfunction.

[0007] The wear-resistant boss of this invention has a trapezoidal cross-section, which increases the contact area between the lower surface of the boss and the glass glaze protective layer, while reducing the interference between the upper surface and the printing medium. The wear-resistant boss contacts the printing medium during the printing process, which can minimize the possibility of the printing medium on the paper output side falling above the common COM electrode. Furthermore, by setting the wear-resistant boss between the resistor and the common COM, with the boss close to the heating resistor and the distance between the heating resistor and the boss not less than the width of the resistor, the purpose of effectively supporting or padding the printing medium on the paper output side can be achieved while ensuring sufficient contact between the printing medium and the heating resistor.

[0008] In this invention, the ratio of the height to the lower width of the wear-resistant boss is 1:5 to 1:10, which increases the contact area between the lower surface of the boss and the glass glaze protective layer, while reducing the interference between the upper surface and the printing medium. The width of the boss is not less than 0.05 mm. Preferably, the height of the boss is 1 to 10 micrometers higher than the glass glaze plane of the silver common electrode surface. More preferably, the height of the boss is 4.5 to 7 micrometers higher than the glass glaze plane of the silver common electrode surface.

[0009] The wear-resistant boss described in this invention is made of the same material as the glass glaze protective layer to ensure the bonding strength between the wear-resistant boss and the glass glaze protective layer.

[0010] Compared with the prior art, the beneficial effects of this invention are that the wear-resistant boss can effectively reduce the contact between the rubber roller and the protective layer on the surface of the silver common electrode on the paper output side, thereby reducing the risk of the protective layer on the surface of the silver common electrode peeling off; at the same time, the ceramic outer protective layer can further enhance the wear resistance of the glass glaze of the boss, significantly improving the reliability of the product. Attached Figure Description

[0011] Figure 1 A cross-sectional structural diagram of this utility model is shown.

[0012] Figure 2 A front structural schematic diagram of this utility model is shown.

[0013] Reference numerals: 1. Insulating substrate; 2. Base glaze layer; 3. Electrode wire; 3a. Common electrode; 3b. Individual electrode; 4. Heating resistor; 5. Common COM electrode; 6. Glass glaze protective layer; 7. Wear-resistant boss; 8. Rubber roller; 9. Ceramic outer protective layer. Detailed Implementation

[0014] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0015] Example:

[0016] like Figure 1 As shown, the thermal printhead heating substrate involved in this example includes an insulating substrate 1, with an amorphous glass base glaze layer 2 on the surface of the insulating substrate 1; a common electrode 3a, individual electrodes 3b, and a common COM electrode 5 are provided on the surface of the base glaze layer 2; a heating resistor 4 is disposed between the common electrode 3a and the individual electrodes 3b along the main printing direction; one end of the common electrode is connected to the heating resistor 4 along the secondary printing direction, and the other end is used to connect to a power supply; one end of the individual electrode is connected to the heating resistor 4 along the secondary printing direction, and the other end is connected to a pad; a glass glaze protective layer 6 covers the surfaces of the heating resistor 4, the common electrode 3a and the individual electrodes 3b, and the silver common COM electrode 5.

[0017] In this example, a wear-resistant protrusion 7 is provided on the glass glaze protective layer 6 between the heating resistor 4 and the silver common COM electrode 5. The height of the wear-resistant protrusion 7 is 1 to 10 micrometers higher than the glass glaze plane on the surface of the silver common electrode 5. Preferably, the height of the wear-resistant protrusion 7 is 4.5 to 7 micrometers higher than the glass glaze plane on the surface of the silver common electrode 5 to avoid interference between the protrusion and the rubber roller due to excessive height, which would affect the printing. In this example, a ceramic outer protective layer 9 is provided above the glass glaze protective layer 6 above the common COM electrode 5 and above the wear-resistant protrusion 7. The rubber roller 8 presses the thermal paper into contact with the glass glaze protective layer 6 above the heating resistor 4. The wear-resistant protrusion 7 is higher than the glass glaze protective layer 6 above the silver common COM electrode 5. At the same time, the ceramic outer protective layer 9 further enhances the wear resistance of the glass glaze on the protrusion, thereby reducing the wear of the protective layer on the silver common COM electrode 5.

[0018] Compared with the prior art, the wear-resistant boss can effectively reduce the contact between the rubber roller and the protective layer on the surface of the silver common electrode on the paper output side, reduce the risk of the protective layer on the surface of the silver common electrode peeling off, and significantly improve the reliability of the product.

Claims

1. A heating substrate for a wear-resistant thermal printhead, comprising an insulating substrate, a base glaze layer on the surface of the insulating substrate, electrode wires on the surface of the base glaze layer, the electrode wires including a common electrode, individual electrodes, and a common COM electrode, a heating resistor disposed between the common electrode and the individual electrodes along the main printing direction, one end of the common electrode being connected to the heating resistor and the other end being connected to a power supply; one end of the individual electrode being connected to the heating resistor and the other end being connected to a pad, and an insulating glass glaze protective layer being provided on the surfaces of the heating resistor, individual electrodes, common electrode, and common COM electrode, characterized in that... A wear-resistant protrusion is provided on the paper output side of the heating resistor. The height of the wear-resistant protrusion is not lower than the height of the glass glaze protective layer above the common COM electrode. The wear-resistant protrusion is provided on the surface of the glass glaze protective layer and is located between the heating resistor and the common COM electrode. A ceramic outer protective layer is also provided on the glass glaze protective layer on the surface of the heating resistor and the common COM electrode.

2. The heating substrate for a wear-resistant thermal printhead according to claim 1, characterized in that, The ceramic outer protective layer is formed by sputtering and has a thickness ranging from 1 to 5 μm.

3. The heating substrate for a wear-resistant thermal printhead according to claim 1, characterized in that, The cross-section of the wear-resistant boss is trapezoidal.

4. The heating substrate for a wear-resistant thermal printhead according to claim 3, characterized in that, By placing the wear-resistant protrusion between the resistor and the common electrode, with the wear-resistant protrusion close to the heating resistor and the distance between the heating resistor and the protrusion not less than the width of the resistor, the printing medium on the paper output side can be effectively supported or supported while ensuring full contact between the printing medium and the heating resistor.

5. The heating substrate for a wear-resistant thermal printhead according to claim 1, characterized in that, The ratio of the height to the bottom width of the wear-resistant boss is 1:5 to 1:10, the ratio of the top to the bottom of the wear-resistant boss is 1.5:2 to 1.5 to 3, and the width of the boss is not less than 0.05mm.

6. The heating substrate for a wear-resistant thermal printhead according to claim 5, characterized in that, The height of the wear-resistant boss is 1 to 10 micrometers higher than the glass glaze plane on the surface of the silver common electrode.

7. The heating substrate for a wear-resistant thermal printhead according to claim 1, characterized in that, The wear-resistant boss is made of the same material as the glass glaze protective layer to ensure the bonding strength between the wear-resistant boss and the glass glaze protective layer.

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