A thermal printhead

Abstract

The application relates to the technical field of heat-sensitive printing devices, in particular to a heat-sensitive printing head capable of effectively reducing printing scratches, which comprises a heat dissipation plate, a heating substrate, a printed circuit board and a sealingly connected integrated circuit control board, the heating substrate comprises an insulating substrate, a bottom glaze layer, a wire electrode, a scratch-proof protrusion and a heating body, the side of the bottom glaze layer facing the printing consumables is in an arc-shaped protruding shape, the wire electrode is laid on the surface of the bottom glaze layer and extends along the surface of the insulating substrate, the scratch-proof protrusion and the heating body are arranged on the surface of the wire electrode and are arranged in parallel along the printing direction, the heating body is arranged at the arc-shaped protruding end of the bottom glaze layer, and the scratch-proof protrusion supports the printing consumables on the upper side and / or the lower side of the heating body. The scratch-proof protrusions arranged on the specific areas on both sides of the heating body effectively support the printing consumables, foreign matters on the surface of the substrate and the protrusions are prevented from contacting the consumables, and the heat-sensitive printing head has the advantages of high reliability and strong practicability.

Description

Technical Field

[0001] This application relates to the field of thermal printing device technology, specifically a thermal printhead that can effectively reduce printing scratches. Background Technology

[0002] In practical applications of thermal printing technology, the adhesion between the print head and the printing consumables directly determines the printing quality.

[0003] In existing technologies, the contact area between the printhead and the printing filament during printing is relatively large, with most of the filament in direct contact with the substrate surface. Even in areas where there is no direct contact, the gap between the filament and the substrate is extremely small. This tight contact means that any foreign objects or protrusions within the contact area can easily scratch the filament during printing, resulting in noticeable scratches on the printed text and severely affecting the appearance and performance of the printed product. Currently, the industry commonly uses grinding to treat foreign objects and protrusions in the printhead contact area to address these scratches. However, this method has significant limitations: firstly, the protective film on the printhead surface is usually quite hard, and grinding can only effectively remove foreign objects attached to the surface of the protective film. It is difficult to achieve ideal cleaning results for foreign objects or protrusions hidden beneath the protective film; secondly, some thermal printhead products use protective films made of special materials, which, due to their inherent characteristics, cannot withstand grinding, greatly limiting the applicability of this method. It is evident that the shortcomings of existing grinding methods in terms of treatment effectiveness and applicability make it difficult to completely solve the problem of printing scratches caused by foreign objects and protrusions in the contact area of ​​the thermal printhead. This situation has become a key bottleneck restricting the further improvement of printing quality in thermal printing technology.

[0004] Therefore, there is an urgent need for a thermal printhead that can effectively reduce printing scratches. Utility Model Content

[0005] The purpose of this application is to provide a thermal printhead to solve the problems in the prior art where foreign objects, protrusions and other impurities easily accumulate in the area where the printhead and consumables are in contact, leading to scratches on the printed text.

[0006] The embodiments of this application can be implemented through the following technical solutions: A thermal printhead includes a heat sink (1) and a heating substrate and a printed circuit board (3) disposed on the top of the heat sink (1), wherein an integrated circuit control board (9) is sealed and connected to the heating substrate and the printed circuit board (3). The heating substrate includes an insulating substrate (2) and a base glaze layer (4), a wire electrode (5), a scratch-resistant protrusion (6), and a heating element (7) disposed on the insulating substrate (2). The base glaze layer (4) is arc-shaped and protrudes on the side facing the printing consumable (11). The wire electrode (5) is laid on the surface of the base glaze layer (4) and extends along the surface of the insulating substrate (2). The scratch-resistant protrusion (6) and the heating element (7) are disposed on the surface of the wire electrode (5) and are arranged parallel to each other along the printing direction. The heating element (7) is disposed at the arc-shaped protrusion end of the base glaze layer (4), and the scratch-resistant protrusion (6) supports the printing consumable (11) on the upper and / or lower side of the heating element (7).

[0007] Furthermore, the anti-scratch protrusion (6) is located in the area where the heating substrate and the printing consumable (11) are in contact, and is located on the side of the contact area closer to the heating element (7). The top height of the anti-scratch protrusion (6) is slightly lower than the top of the heating element (7).

[0008] Furthermore, the anti-scratch protrusion (6) and the heating element (7) are spaced apart along the printing direction, and the length of the anti-scratch protrusion (6) is not less than the effective printing length of the heating element (7).

[0009] Furthermore, the distance between the anti-scratch protrusion (6) and the heating element (7) is within the range of 0.5mm-2mm.

[0010] Furthermore, the width of the anti-scratch protrusion (6) is in the range of 0.1mm to 1.5mm.

[0011] Furthermore, the height of the anti-scratch protrusion (6) is in the range of 0.01mm to 0.05mm.

[0012] Furthermore, the surface of the wire electrode (5) and the anti-scratch protrusion (6) and the heating element (7) provided thereon together constitute the printing working surface, and a protective film (8) is provided on the surface of the printing working surface.

[0013] Furthermore, the protective film (8) is made of ceramic or metal oxide materials.

[0014] Furthermore, the hardness value of the anti-scratch protrusion (6) is not less than 70% of the hardness value of the protective film (8).

[0015] The thermal printhead provided in the embodiments of this application has at least the following beneficial effects: This application provides anti-scratch protrusions in specific areas on both sides of the heating element, which effectively support the printing filament during the printing process. This not only reduces the direct contact area between the filament and the substrate surface, but also leaves sufficient space between the filament and the substrate in the non-contact area around the heating element. This design fundamentally prevents foreign objects and protrusions on the substrate surface from contacting the filament, thereby effectively reducing printing scratches caused by such impurities during printing, significantly improving the stability of printing quality, and has advantages such as high reliability and strong practicality. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of a conventional thermal printhead in the printing state; Figure 2 This is a schematic diagram of the structure of a thermal printhead according to this application; Figure 3 This is a schematic diagram of a thermal printhead in the printing state according to this application.

[0017] Numbers in the diagram 1-Heat sink, 2-Insulating substrate, 3-Printed circuit board, 4-Base glaze layer, 5-Wire electrode, 6-Scratch-resistant protrusion, 7-Heating element, 8-Protective film, 9-Integrated circuit control board, 10-Encapsulating adhesive, 11-Printing consumables. Detailed Implementation

[0018] The present application will now be further described based on preferred embodiments and with reference to the accompanying drawings.

[0019] Furthermore, for ease of understanding, various components on the drawings have been enlarged or reduced, but this is not intended to limit the scope of protection of this application.

[0020] Singular forms of words also include plural meanings, and vice versa.

[0021] In the description of the embodiments of this application, it should be noted that if terms such as "upper," "lower," "inner," or "outer" are used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this application is in use, they are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. In addition, in the description of this application, in order to distinguish different units, the terms "first," "second," etc. are used in this specification, but these are not limited by the manufacturing order, nor should they be construed as indicating or implying relative importance. Their names may differ in the detailed description and claims of this application.

[0022] The vocabulary used in this specification is for illustrative purposes and is not intended to limit the scope of this application. It should also be noted that, unless otherwise expressly specified and limited, the terms "set," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, a direct connection, or an indirect connection via an intermediate medium; or they can refer to the internal communication between two components. Those skilled in the art will understand the specific meaning of these terms in this application.

[0023] like Figure 1 As shown, a thermal printhead includes a heat sink 1, a heating substrate, a printed circuit board 3, an integrated circuit control board 9, and encapsulating adhesive 10. The heating substrate and the printed circuit board 3 are disposed on the top of the heat sink 1. The integrated circuit control board 9 is sealed and connected to the heating substrate and the printed circuit board 3 by the encapsulating adhesive 10. During printing, the control signal first goes to the printed circuit board 3 from the outside, and then reaches the heating substrate through the integrated circuit control board 9 to drive it to complete the printing action.

[0024] In existing technologies, such as Figure 1 As shown, during the printing process, the printing consumable 11 comes into direct contact with the surface of the heating substrate other than the heating element 7. This close contact means that any foreign objects or protrusions in the contact area can easily scratch the consumable during printing, resulting in noticeable scratches on the printed text and severely affecting the appearance and performance of the printed product. Therefore, this application adjusts the structure of the heating substrate to maintain a sufficient distance between the consumable and the substrate in the non-direct contact area around the heating element 7, preventing foreign objects or protrusions on the substrate from contacting the consumable in this area, thereby effectively reducing scratches on the printed text caused by foreign objects or protrusions on the substrate during printing. The specific settings are as follows: In some preferred embodiments, such as Figure 2 , Figure 3 As shown, the heating substrate includes an insulating substrate 2 and a base glaze layer 4, wire electrodes 5, anti-scratch protrusions 6 and heating element 7 disposed on the insulating substrate 2. The base glaze layer 4 is arc-shaped protrusion on the side facing the printing consumable 11, which is used to provide a suitable support surface for the upper components. The wire electrodes 5 are laid on the surface of the base glaze layer 4 in the form of a conductive layer and extend along the surface of the insulating substrate 2 to form the basic path for circuit conduction.

[0025] Furthermore, the anti-scratch protrusion 6 and the heating element 7 are disposed on the surface of the wire electrode 5, and the two are arranged parallel to each other along the printing direction. The heating element 7 is disposed on the arc-shaped protrusion end of the base glaze layer 4 to ensure effective contact with the consumable during printing to complete the heating and printing. The anti-scratch protrusion 6 is located in the area where the heating substrate and the printing consumable 11 are in contact, and is located on the side of the contact area closer to the heating element 7. The top of the anti-scratch protrusion 6 is slightly lower than the top of the heating element 7, which is used to support the printing consumable 11, reduce the area of ​​direct contact between the printing consumable 11 and the substrate surface, and at the same time, maintain a sufficient distance between the consumable and the substrate in the non-direct contact area around the heating element 7 to prevent foreign objects or protrusions on the substrate in this area from contacting the consumable, thereby effectively reducing the printing scratches caused by foreign objects or protrusions on the substrate during printing.

[0026] In some preferred embodiments, the anti-scratch protrusion 6 and the heating element 7 are spaced apart along the printing direction, and the length of the anti-scratch protrusion 6 is not less than the effective printing length of the heating element 7, thereby effectively reducing the printing scratches caused by foreign objects and protrusions on the substrate in the entire effective printing area of ​​the product.

[0027] In some preferred embodiments, the distance between the anti-scratch protrusion 6 and the heating element 7 is in the range of 0.5mm-2mm. The specific value should be determined according to the actual size of the heating substrate and the actual situation of the printing roller. This is to avoid printing interference caused by the protrusion being too close to the heating element 7 through reasonable spacing, while ensuring that there is a sufficient distance between the consumables in the non-direct contact area around the heating element 7 and the substrate, thereby achieving a balance between the effectiveness of protection and the stability of printing.

[0028] In some preferred embodiments, the width of the anti-scratch protrusion 6 is within the range of 0.1mm-1.5mm, and the height is within the range of 0.01mm-0.05mm. The specific values ​​of the width and height of the anti-scratch protrusion 6 should be determined according to the actual size of the heating substrate and the actual situation of the printing roller, so that it can effectively prevent foreign object scratches without occupying too much printing space.

[0029] In some preferred embodiments, the surface of the lead electrode 5, the anti-scratch protrusion 6, and the heating element 7 together constitute the printing working surface. The surface of the printing working surface is provided with a protective film 8, which is used to provide overall protection for the lead electrode 5, the anti-scratch protrusion 6, and the heating element 7. This not only prevents them from directly rubbing against the printing consumable 11 and causing wear, but also blocks the corrosion of the working surface by external foreign objects. In conjunction with the anti-scratch protrusion 6, it further reduces the generation of scratches during the printing process, ensuring the stable operation of the print head and the printing quality.

[0030] In some preferred embodiments, the protective film 8 is made of ceramic or metal oxide materials to provide multi-dimensional protection for the printing surface and ensure long-term stable operation of the print head.

[0031] In some preferred embodiments, the hardness value of the anti-scratch protrusion 6 is not less than 70% of the hardness value of the protective film 8, so as to prevent the protective film from cracking and peeling when the anti-scratch protrusion 6 is pressed by the rubber roller, and at the same time, it is not easy to deform or wear when intercepting foreign objects or rubbing against minor impurities, thus maintaining a long-term protective effect.

[0032] The specific embodiments of this application have been described in detail above. For those skilled in the art, several improvements and modifications can be made to this application without departing from the principle of this application, and these improvements and modifications also fall within the protection scope of the claims of this application.

Claims

1. A thermal printhead, comprising a heat sink (1) and a heating substrate and a printed circuit board (3) disposed on the top of the heat sink (1), wherein an integrated circuit control board (9) is sealed and connected to the heating substrate and the printed circuit board (3), characterized in that: The heating substrate includes an insulating substrate (2) and a base glaze layer (4), a wire electrode (5), a scratch-resistant protrusion (6), and a heating element (7) disposed on the insulating substrate (2). The base glaze layer (4) is arc-shaped and protrudes on the side facing the printing consumable (11). The wire electrode (5) is laid on the surface of the base glaze layer (4) and extends along the surface of the insulating substrate (2). The scratch-resistant protrusion (6) and the heating element (7) are disposed on the surface of the wire electrode (5) and are arranged parallel to each other along the printing direction. The heating element (7) is disposed at the arc-shaped protrusion end of the base glaze layer (4), and the scratch-resistant protrusion (6) supports the printing consumable (11) on the upper and / or lower side of the heating element (7).

2. The thermal printhead according to claim 1, characterized in that: The anti-scratch protrusion (6) is located in the area where the heating substrate and the printing consumable (11) are in contact, and is located on the side of the contact area closer to the heating element (7). The top of the anti-scratch protrusion (6) is slightly lower than the top of the heating element (7).

3. The thermal printhead according to claim 1, characterized in that: The anti-scratch protrusion (6) and the heating element (7) are spaced apart along the printing direction, and the length of the anti-scratch protrusion (6) is not less than the effective printing length of the heating element (7).

4. The thermal printhead according to claim 1, characterized in that: The distance between the anti-scratch protrusion (6) and the heating element (7) is within the range of 0.5mm-2mm.

5. The thermal printhead according to claim 1, characterized in that: The width of the anti-scratch protrusion (6) is in the range of 0.1mm to 1.5mm.

6. The thermal printhead according to claim 1, characterized in that: The height of the anti-scratch protrusion (6) is in the range of 0.01mm to 0.05mm.

7. The thermal printhead according to claim 1, characterized in that: The surface of the wire electrode (5) and the anti-scratch protrusion (6) and the heating element (7) together constitute the printing surface, and a protective film (8) is provided on the surface of the printing surface.

8. The thermal printhead according to claim 7, characterized in that: The protective film (8) is made of ceramic or metal oxide materials.

9. The thermal printhead according to claim 7, characterized in that: The hardness value of the anti-scratch protrusion (6) is not less than 70% of the hardness value of the protective film (8).

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