Thermal printing head heating circuit arrangement structure capable of uniformly heating and thermal printing head

Abstract

The invention provides a thermal printing head heating circuit arrangement structure uniform in heating and a thermal printing head, and relates to the technical field of thermal printing heads. Comprising a heating body and electrodes connected to the heating body, and the electrodes comprise a plurality of first electrodes and second electrodes which are arranged and distributed on the two opposite sides of the heating body at intervals; wherein a first uniform heating part and a second uniform heating part are respectively formed at the tail ends of the first electrode and the second electrode, and the adjacent first uniform heating part and second uniform heating part are arranged in a staggered manner; and a third uniform heating part is arranged between the first uniform heating part and the second uniform heating part, so that the heat of the heating body is uniformly distributed. According to the scheme, the heat uniformity of the thermal printing head is improved.

Description

Technical Field

[0001] The invention relates to the technical field of thermal print heads, and in particular to a thermal print head heating circuit arrangement structure with uniform heating, and a thermal print head. Background Art

[0002] The thermal print head is equipped with a large number of continuous thermal heating units that are linearly configured at a certain resolution. The stacked structure of each heating unit on the heating substrate from bottom to top is substrate, base glaze, electrode, heating element, and protective layer. The printer drives the logic signal according to the printing content and applies a voltage to each heating unit through the control IC for a corresponding time to generate Joule heat in the heating unit. The heat energy generated by the heating unit acts on the thermal medium to make the thermal medium color and realize printing.

[0003] As the printing market's requirements for color and two-color printing continue to increase, the printing effect of the existing thermal printhead heating structure cannot fully meet the quality requirements. The main problems are uneven colors in color printing and color confusion in two-color printing. Figure 1 and Figure 2 As shown, Figure 1 is the shape of the electrode on the existing current loop, Figure 2 for Figure 1 The heat distribution diagram of the heating electrode shows that, because the electrode is a conductor, the part where the heating element overlaps with the conductor does not generate heat, and only the part that does not overlap with the conductor generates heat. Figure 1 In the process, due to the cross distribution of the electrodes in the shape of a rectangular parallelepiped, the heating temperature distribution shape is like two peaks, resulting in uneven heating, which in turn leads to uneven heat distribution in the printing area of ​​the thermal print head, thus causing the above-mentioned problem. Summary of the invention

[0004] The invention discloses a uniformly heated thermal print head heating circuit arrangement structure, which aims to change the structure of the existing thermal print head heating circuit, control the resistance value and current distribution, and further control the heat distribution of the heating element, so as to achieve uniform heat distribution and thus enable uniform printing.

[0005] The present invention adopts the following scheme:

[0006] A thermal print head heating circuit arrangement structure with uniform heating includes a heating element and an electrode connected to the heating element, wherein the electrode includes a plurality of first electrodes and a second electrode arranged at intervals and distributed on two opposite sides of the heating element; wherein:

[0007] A first uniform heating portion and a second uniform heating portion are formed at the ends of the first electrode and the second electrode, respectively, and the adjacent first uniform heating portions and second uniform heating portions are staggered;

[0008] A third uniform heating portion is provided between the first uniform heating portion and the second uniform heating portion to make the heat distribution of the heating element uniform.

[0009] Furthermore, the first uniform heating portion and the two second uniform heating portions on both sides thereof form an equilateral triangle distribution structure.

[0010] Furthermore, with the intersection of the longitudinal symmetry line of the bottom of the first uniform heating portion and the center line of the gap between the bottom of the first uniform heating portion and the top of the second uniform heating portion as the base point, the symmetry center of the third uniform heating portion is set at a position offset a certain distance downward from the base point, and the offset distance is 0.15 to 0.2 times the vertical spacing between the bottom of the first uniform heating portion and the top of the second uniform heating portion.

[0011] Furthermore, the distance between the first uniform heating portion and the second uniform heating portion is 10um-50um.

[0012] Furthermore, the first uniform heating portion and the second uniform heating portion are configured as electrodes with a rectangular structure.

[0013] Furthermore, the rectangular structure has a length of 50um-100um and a width of 20um-50um.

[0014] Furthermore, the third uniform heating portion is configured as a circular structure.

[0015] Furthermore, the diameter of the circular structure is 10um-24um.

[0016] The present invention further provides a thermal print head, comprising any one of the thermal print head heating circuit arrangement structures for uniformly generating heat.

[0017] Beneficial effects:

[0018] In this solution, a staggered first uniform heating portion and a second uniform heating portion are arranged in the middle portion of the heating element to separate the upper and lower rows of electrodes, thereby changing the heating range of the heating element, and a circular third uniform heating portion is arranged in the middle area formed by the upper and lower rows of uniform heating portions, thereby changing the heating area, so that the entire heating element can achieve uniform heat distribution and more uniform color during printing. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of the existing thermal print head heating circuit arrangement structure;

[0020] Figure 2 yes Figure 1 Thermal print head heat distribution simulation diagram of the structure;

[0021] Figure 3 This is a schematic diagram of a structure of a heating circuit arrangement structure of a thermal print head with uniform heating according to the present embodiment;

[0022] Figure 4 This is a schematic cross-sectional structure diagram of a heating circuit arrangement structure of a thermal print head with uniform heating according to the present embodiment;

[0023] Figure 5 This is a heat distribution simulation diagram of a heat-sensitive print head heating circuit arrangement structure with uniform heat generation in this embodiment;

[0024] Heating element 1, first electrode 2, second electrode 3, first uniform heating portion 21, second uniform heating portion 31, third uniform heating portion 4 DETAILED DESCRIPTION

[0025] Combination Figure 3 and Figure 5 As shown, this embodiment provides a thermal print head, including a thermal print head heating circuit arrangement structure with uniform heating. The thermal print head heating circuit arrangement structure with uniform heating includes a heating element 1 and an electrode connected to the heating element, wherein the electrode includes a plurality of first electrodes 2 and a second electrode 3 arranged at intervals and distributed on two opposite sides of the heating element 1; wherein the ends of the first electrode 2 and the second electrode 3 are respectively formed with a first heating uniform portion 21 and a second heating uniform portion 31, and the adjacent first heating uniform portions 21 and second heating uniform portions 31 are arranged in a staggered manner; a third heating uniform portion 4 is arranged between the first heating uniform portion 21 and the second heating uniform portion 31, so as to make the heat distribution of the heating element 1 uniform.

[0026] Combination Figure 3 and Figure 5 As shown, in this embodiment, the first electrodes 2 are arranged at equal intervals on one side of the heating element 1, and the second electrodes 3 are arranged at equal intervals on the other side of the heating element 1, and the first electrodes 2 and the second electrodes 3 are arranged in a staggered manner. Here, staggered arrangement means that one of the first electrodes 2 is arranged in the gap between the two second electrodes 3 on its adjacent sides, and is located in the middle position of the two adjacent second electrodes 3. There is a certain distance between the ends of the first electrode 2 and the second electrode 3, so that an intermediate area is formed between the ends of the first electrode 2 and the second electrode 3. The third uniform heating portion 4 corresponds to the first uniform heating portion 21, that is, each first uniform heating portion 21 is correspondingly provided with a third uniform heating portion 4. By providing the third uniform heating portion 4, the intermediate area between the first electrode 2 and the second electrode 3 can be heated more evenly.

[0027] In this embodiment, the electrodes overlap on the heating element 1, and the heating element 1 does not generate heat in the overlapped portion, while the portion without the overlapped electrodes can generate heat. Therefore, in this embodiment, the first heating uniform portion 21 and the second heating uniform portion 31 are arranged as electrodes of a rectangular structure, and the upper and lower rows of electrodes are separated, and the heating area of ​​the heating element 1 can be changed in conjunction with the third heating uniform portion, so that the heating is more uniform.

[0028] In a preferred embodiment, the first uniform heating portion 21 and the two second uniform heating portions 31 on its adjacent sides form an equilateral triangle distribution structure, and the third uniform heating portion 4 is arranged in the gap between the first uniform heating portion and the second uniform heating portion; specifically, the intersection of the longitudinal symmetry line at the bottom of the first uniform heating portion 21 and the center line of the gap between the bottom of the first uniform heating portion 21 and the top of the second uniform heating portion 31 is taken as the base point, and the symmetry center of the third uniform heating portion 4 is arranged at a position offset downward by a certain distance from the base point, and the offset distance is 0.15 to 0.2 times the vertical spacing between the bottom of the first uniform heating portion 21 and the top of the second uniform heating portion 31. The distance between the first uniform heating portion 21 and the second uniform heating portion 31 is controlled at 10um-50um to make the heat uniformity of the heating area better. In this embodiment, the third uniform heating portion 4 is arranged on the third electrode, and the third electrode is connected to the heating element 1.

[0029] In one embodiment, the first uniform heating portion 21 and the second uniform heating portion 31 are arranged in a rectangular structure, the length of the rectangular structure is 50um-100um, and the width is 20um-50um; the third uniform heating portion 4 is arranged in a circular structure; the diameter of the circular structure is 10um-24um, and the center position is arranged at a position offset downward by a certain distance from the base point position mentioned above, and the offset distance is 0.15 to 0.2 times the vertical spacing between the bottom of the first electrode 2 and the top of the second electrode 3. By setting the rectangular structure, the coverage area of ​​the electrode heating is larger and the wiring is more uniform. At the same time, the third uniform heating portion 4 with a circular structure also makes the heating in the middle area between the first electrode 2 and the second electrode 3 more uniform, and the circular third uniform heating portion 4 can make the heat distribution between the first uniform heating portion 21 and the second uniform heating portion 31 distributed in an equilateral triangle more uniform.

[0030] In this embodiment, by setting the shape of the heating electrode, the heating temperature distribution of the heating element 1 can be made more uniform without changing the existing manufacturing process, thereby reducing the cost of product upgrade.

[0031] It should be understood that the above are only preferred implementations of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention.

[0032] The above description of the drawings used in the implementation manner only illustrates certain embodiments of the present invention and should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

Claims

1. A thermal print head heating circuit arrangement structure with uniform heating, comprising a heating element and an electrode connected to the heating element, characterized in that: The electrodes include a plurality of first electrodes and second electrodes arranged at intervals and distributed on two opposite sides of the heating element; wherein, A first uniform heating portion and a second uniform heating portion are formed at the ends of the first electrode and the second electrode, respectively, and the adjacent first uniform heating portions and second uniform heating portions are staggered; A third uniform heating portion is provided between the first uniform heating portion and the second uniform heating portion to make the heat distribution of the heating element uniform.

2. The uniformly heated thermal print head heating circuit arrangement structure according to claim 1, characterized in that: The first uniform heating portion and the two second uniform heating portions on both sides thereof form an equilateral triangle distribution structure.

3. The uniformly heated thermal print head heating circuit arrangement structure according to claim 2, characterized in that: Taking the intersection of the longitudinal symmetry line of the bottom of the first uniform heating portion and the center line of the gap between the bottom of the first uniform heating portion and the top of the second uniform heating portion as the base point, the symmetry center of the third uniform heating portion is set at a position offset downward by a certain distance from the base point, and the offset distance is 0.15 to 0.2 times the vertical spacing between the bottom of the first uniform heating portion and the top of the second uniform heating portion.

4. The uniformly heated thermal print head heating circuit arrangement structure according to claim 2, characterized in that: The distance between the first uniform heating portion and the second uniform heating portion is 10um-50um.

5. The uniformly heated thermal print head heating circuit arrangement structure according to claim 1, characterized in that: The first uniform heating portion and the second uniform heating portion are arranged as electrodes of a rectangular structure.

6. The uniformly heated thermal print head heating circuit arrangement structure according to claim 5, characterized in that: The rectangular structure has a length of 50um-100um and a width of 20um-50um.

7. The uniformly heated thermal print head heating circuit arrangement structure according to claim 1, characterized in that: The third uniform heating portion is configured as a circular structure.

8. The uniformly heated thermal print head heating circuit arrangement structure according to claim 7, characterized in that: The diameter of the circular structure is 10um-24um.

9. A thermal print head, characterized in that: The invention comprises a thermal print head heating circuit arrangement structure with uniform heating as claimed in any one of claims 1 to 8.

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