CN211106365U

CN211106365U - Thermal printing head

Info

Publication number: CN211106365U
Application number: CN201921079926.9U
Authority: CN
Inventors: 李钢
Original assignee: Chaozhou Three Circle Group Co Ltd
Current assignee: Chaozhou Three Circle Group Co Ltd
Priority date: 2019-07-10
Filing date: 2019-07-10
Publication date: 2020-07-28
Anticipated expiration: 2029-07-10

Abstract

The utility model discloses a thermal printing head, which comprises a substrate, a conducting layer and a heating resistance layer; the conductive layer comprises an individual electrode, a comb-shaped electrode and a common electrode; the individual electrode and the comb-shaped electrode are both provided with a wide part and a narrow part, and a first arc part is arranged between the common electrode and the wide part of the comb-shaped electrode; and/or the wide part and the narrow part of the comb electrode are in transition connection through a second circular arc part; and/or the wide part and the narrow part of the individual electrode are connected in a transition manner by a third circular arc part. The utility model reduces the line resistance by adding the arc transition section in the electrode structure of the conducting layer of the thermal printer head, increases the heating power and speed of the heating point, and is beneficial to further improving the printing speed; the high-frequency current or the large current passes through the printing device, so that the current is stable, the printing quality during high-speed printing is ensured, and the printing effect is clear; the transition area has no obvious edge structure, so that the electric field intensity at the position is prevented from being excessively concentrated, and the ablation at the position is prevented from being serious.

Description

Thermal printing head

Technical Field

The utility model relates to a thermal printer, concretely relates to thermal printer head.

Background

In a conventional thermal printhead, a circuit structure of a substrate includes a common electrode, a comb electrode, and an electrode structure of an individual electrode, the comb electrode is connected to the individual electrode through a heating resistor, and a protective layer covers the electrode structure and the heating resistor. In order to improve the printing fineness, the comb-shaped electrodes and the individual electrodes generally have wide electrode portions and narrow electrode portions, and the heating resistors are connected to the narrow electrode portions of the adjacent comb-shaped electrodes and the individual electrodes, respectively.

In the existing electrode structure design, the circuit structure of the dressing electrode and the individual electrode directly enters the narrow electrode part from the wide electrode part. In the current conduction shown in figure 1, the current directly passes through the wide part (4A) of the dressing electrode from the common electrode (3) and then directly enters the narrow part (4B) and the heating resistor (6B), and then directly enters the wide part (5B) of the individual electrode from the heating resistor (6A) and then passes through the narrow part (5A) of the individual electrode, namely, the connection between the wide electrode part and the narrow electrode part is a cliff type vertical connection.

The existing electrode structure has the following defects:

1) the common electrode directly enters the narrow electrode part, so that the line resistance is increased, and the possibility of high-speed printing is reduced;

2) the border of the wide and narrow electrodes has no transition, so that the current density in high-speed high-frequency conduction is unstable, and the high-speed printing quality is fuzzy and unstable;

3) the electric field distribution is concentrated at the interface of the wide and narrow electrodes, so that the interface is easy to ablate.

Disclosure of Invention

The utility model aims to overcome the shortcomings of the prior art and provide a thermal printing head.

In order to achieve the above purpose, the utility model adopts the following technical scheme: a thermal print head comprises a substrate, a conductive layer and a heating resistance layer; the conductive layer comprises an individual electrode, a comb-shaped electrode and a common electrode; the heating resistor layer comprises a plurality of heating parts which are arranged at intervals along the main scanning direction, one end of the comb-shaped electrode along the sub-scanning direction is connected with the heating parts, and the other end of the comb-shaped electrode is electrically connected with the common electrode; one end of the individual electrode along the sub-scanning direction is connected with the heating part, and the other end is connected with a control IC;

the individual electrodes and the comb-shaped electrodes are provided with wide portions and narrow portions, and the width of each wide portion is larger than that of each narrow portion;

the wide part of the comb-shaped electrode is close to the common electrode, and a first arc part is arranged between the common electrode and the wide part of the comb-shaped electrode; and/or

The wide part and the narrow part of the comb electrode are in transitional connection through a second arc part; and/or

The wide part and the narrow part of the individual electrode are in transitional connection through a third circular arc part.

The utility model discloses an add the circular arc changeover portion in the conducting layer electrode structure of thermal printer head-first circular arc portion, second circular arc portion and third circular arc portion, have following advantage: 1. the resistance value of the circuit is reduced, the heating power and speed of the heating point are increased, and the printing speed is further improved; 2. the high-frequency current or the large current passes through the printing device, so that the current is stable, the printing quality during high-speed printing is ensured, and the printing effect is clear; 3. the transition area has no obvious edge structure, so that the electric field intensity at the position is prevented from being excessively concentrated, and the ablation at the position is prevented from being serious. Beat printer head and be applicable to film type printer and thick film type printer.

The substrate can be a ceramic substrate such as alumina or other insulating glass substrates. The heating resistance layer material can be TaSiO series, TaSiNO series, NbSiO series or TiSiO series metal ceramic material (generally used by a thin film type printing head); ruthenium-based resistor paste (generally used for thick film type print heads). The conducting layer is made of metal material with Ag, Pd, Au, Pt, Ni, Cu or Al as main component.

Preferably, the curvature radius of the first circular arc part is more than or equal to 25 μm.

Preferably, the radius of curvature of the second arc portion is 50 μm to 150 μm.

Preferably, the radius of curvature of the third arc portion is 50 μm to 150 μm.

The inventor finds that when the arc parts adopt the curvature radius, the printing speed is higher, the printing is clearer, the printing effect is better, and the damage condition is minimum.

Preferably, the glass-ceramic composite material further comprises a glass glaze layer, the glass glaze layer is arranged on the substrate, the conducting layer is arranged on the glass glaze layer, and the heating resistance layer is arranged on the conducting layer. This structure is suitable for thick film type printers. Preferably, a protective layer is provided on the heat generating resistive layer and the conductive layer.

Preferably, the individual electrodes and the comb-shaped electrodes are arranged at intervals.

Preferably, the glass-ceramic composite material further comprises a glass glaze layer, the glass glaze layer is arranged on the substrate, the heating resistance layer is arranged on the glass glaze layer, and the conducting layer is arranged on the heating resistance layer. This structure is suitable for a film type printer. Preferably, the conductive layer and the heating resistor layer are provided with protective layers.

Preferably, the individual electrodes and the comb-shaped electrodes are connected through a heat generating portion.

The utility model also aims to provide a thermal printing head, which comprises a substrate, a conducting layer and a heating resistance layer; the conducting layer comprises individual electrodes and a folded middle electrode, the heating resistance layer comprises a plurality of heating parts which are arranged at intervals along the main scanning direction, one end of each two adjacent individual electrodes along the sub-scanning direction is respectively connected with the two adjacent heating parts, and the other end of each two adjacent individual electrodes is respectively connected with the control IC and the power supply; the folded middle electrode is connected with two adjacent heating parts and is respectively in a folded shape;

the individual electrodes and the folded-back intermediate electrode are each provided with a wide portion and a narrow portion, the wide portion having a width larger than the narrow portion;

the folded part is provided with a fourth arc part;

the wide part and the narrow part of the folded middle electrode are in transitional connection through a fifth arc part; and/or

The wide part and the narrow part of the individual electrode are in transitional connection through a sixth arc part.

And arc transition sections, namely a fourth arc part, a fifth arc part and a sixth arc part, are additionally arranged in the electrode structure of the conducting layer, so that the resistance value of the line is reduced, and the advantages are also achieved. This structure is suitable for a film type printer.

Preferably, the curvature radius of the fourth arc part is more than or equal to 25 μm;

preferably, the curvature radius of the fifth circular arc part is 50-150 μm;

preferably, the curvature radius of the sixth arc portion is 50 μm to 150 μm.

Preferably, the glass-ceramic composite material further comprises a glass glaze layer, the glass glaze layer is arranged on the substrate, the heating resistance layer is arranged on the glass glaze layer, and the conducting layer is arranged on the heating resistance layer.

Preferably, the heat generating resistor further comprises a protective layer covering the heat generating resistive layer and at least a part of the conductive layer.

In the present invention, the protective layer material is formed of hard glass (e.g., borosilicate glass) having excellent abrasion resistance, heat resistance, thermal conductivity, or the like, or silicon nitride (Si) having more excellent abrasion resistance₃N₄) SiC or SiAlON (SiAlON), and the like.

Each layer can be formed into a predetermined pattern by using screen printing (heat generating resistive layer, conductive layer, and protective layer which are commonly used for thick film), sputtering (which is commonly used for thin film type print head), and photolithography etching.

The beneficial effects of the utility model reside in that: the utility model provides a thermal printer head, the utility model reduces the line resistance by adding the arc transition section in the electrode structure of the conducting layer of the thermal printer head, increases the heating power and speed of the heating point, and is beneficial to further improving the printing speed; the high-frequency current or the large current passes through the printing device, so that the current is stable, the printing quality during high-speed printing is ensured, and the printing effect is clear; the transition area has no obvious edge structure, so that the electric field intensity at the position is prevented from being excessively concentrated, and the ablation at the position is prevented from being serious.

Drawings

FIG. 1 is a schematic structural diagram of a conductive layer electrode structure of a thermal printer head in the prior art;

FIG. 2 is a partial plan view of the conductive layer electrode structure of the thick film thermal printer head according to example 1;

FIG. 3 is a schematic cross-sectional view of a thick film thermal printer head according to example 1;

FIG. 4 is a partial plan view of a conductive layer electrode structure of the thin film type thermal printer head according to embodiment 2;

FIG. 5 is a schematic cross-sectional view of a thin film type thermal printer head according to embodiment 2;

FIG. 6 is a partial plan view of a conductive layer electrode structure of the thin film type thermal printer head according to embodiment 3;

FIG. 7 is a schematic cross-sectional view of a thin film type thermal printer head according to embodiment 3;

wherein, 1, a substrate; 2. a glass glaze layer; 3. a common electrode; 4. a comb electrode; 4A, a wide part of the comb-shaped electrode; 4B, narrow portions of comb electrodes; 4C, a first arc part; 4D, a second arc part; 5. individual electrodes; 5A, narrow portions of the individual electrodes; 5B, wide portions of the individual electrodes; 5C, a third arc part/a sixth arc part; 6. a heat generating resistor layer; 6A, a heating part; 6B, a heating belt; 7. a protective layer; 8. a folded-back intermediate electrode; 8A, a wide portion folded back the intermediate electrode; 8B, a folded-back middle electrode narrow portion; 8C, four arc parts; 8D and the fifth arc part.

Detailed Description

For better illustrating the objects, technical solutions and advantages of the present invention, the present invention will be further described with reference to the accompanying drawings and specific embodiments.

Example 1

An embodiment of thermal printer head, this embodiment the thermal printer head is thick membrane type thermal printer head, and conducting layer electrode structure sketch map 2, and section structure sketch map 3.

The thick-film thermal printer head comprises a substrate 1, a glass glaze layer 2, a conducting layer, a heating resistance layer 6 and a protective layer 7; the conductive layer comprises an individual electrode 5, a comb-shaped electrode 4 and a common electrode 3; the glass glaze layer 2 is arranged on the substrate 1, the conducting layer is arranged on the glass glaze layer 2, and the heating resistance layer 6 is arranged on the conducting layer; the protective layer 7 is arranged on the heating resistance layer 6 and at least one part of the conducting layer; the individual electrodes 5 and the comb-shaped electrodes 4 are arranged at intervals.

A plurality of heating portions 6A arranged at intervals in the main scanning direction on the heating resistor layer 6, one end of the comb-shaped electrode 4 in the sub-scanning direction being connected to the heating portions 6A, and the other end being electrically connected to the common electrode 3; one end of the individual electrode 5 in the sub-scanning direction is connected to the heat generating section 6A, and the other end is connected to a control IC (not shown); the individual electrodes 5 and the comb electrodes 4 are each provided with a wide portion and a narrow portion, the wide portion having a width larger than the narrow portion;

the wide part 4A of the comb-shaped electrode is close to the common electrode 3, and a first arc part 4C is arranged between the common electrode 3 and the wide part 4A of the comb-shaped electrode; the wide part 4A and the narrow part 4B of the comb electrode are in transition connection through a second arc part 4D; the wide portion 5B and the narrow portion 5A of the individual electrode are transitionally connected by a third arc portion 5C.

Preferably, the curvature radius of the first arc part 4C is more than or equal to 25 μm;

preferably, the radius of curvature of the second arc portion 4D is 50 μm to 150 μm;

preferably, the radius of curvature of the third arc portion 5C is 50 μm to 150 μm.

Example 2

An embodiment of thermal printer head, this embodiment the thermal printer head is film type thermal printer head, and conducting layer electrode structure sketch map is shown in figure 4, and section structure sketch map is shown in figure 5.

The thin film type thermal printer head comprises a substrate 1, a glass glaze layer 2, a conducting layer, a heating resistance layer 6 and a protective layer 7; the conductive layer comprises an individual electrode 5, a comb-shaped electrode 4 and a common electrode 3; the glass glaze layer 2 is arranged on the substrate 1, the heating resistance layer 6 is arranged on the glass glaze layer 2, and the conducting layer is arranged on the heating resistance layer 6; the protective layer 7 is arranged on the conductive layer; the individual electrode 5 and the comb-like electrode 4 are connected to each other through a heat generating portion 6A.

Example 3

An embodiment of thermal printer head, this embodiment the thermal printer head is film type thermal printer head, and conducting layer electrode structure sketch map is seen in figure 6, and section structure sketch map is seen in figure 7.

The thin film type thermal printer head comprises a substrate 1, a glass glaze layer 2, a conducting layer, a heating resistance layer 6 and a protective layer 7; the conductive layer comprises individual electrodes 5 folded back to intermediate electrodes 8; the glass glaze layer 2 is arranged on the substrate 1, the heating resistance layer 6 is arranged on the glass glaze layer 2, and the conducting layer is arranged on the heating resistance layer 6; the protective layer 7 is arranged on the conductive layer; the individual electrode 5 and the comb-like electrode 4 are connected to each other through a heat generating portion 6A.

A plurality of heating portions 6A arranged at intervals in the main scanning direction in the heating resistor layer 6, one end of each of two adjacent individual electrodes 5 in the sub-scanning direction being connected to the heating portion, and the other end being connected to a control IC and a power supply (not shown); the folded middle electrode 8 is connected with two adjacent heating parts 6A, and each folded middle electrode is in a folded shape; the individual electrode 5 and the folded-back intermediate electrode 8 are each provided with a wide portion and a narrow portion, the wide portion having a width larger than the narrow portion;

the inflection part is in an arc shape and is called as a fourth arc part 8C;

the wide part 8A and the narrow part 8B of the folded middle electrode are in transition connection through a fifth circular arc part 8D;

the wide portion 5B and the narrow portion 5A of the individual electrode are transitionally connected by a sixth arc 5C.

Preferably, the curvature radius of the fourth arc part 8C is more than or equal to 25 μm;

preferably, the curvature radius of the fifth arc portion 8D is 50 μm to 150 μm;

preferably, the curvature radius of the sixth arc portion 5C is 50 μm to 150 μm.

Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting the protection scope of the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solutions of the present invention can be modified or replaced with equivalents without departing from the spirit and scope of the technical solutions of the present invention.

Claims

1. A thermal print head is characterized by comprising a substrate, a conducting layer and a heating resistance layer; the conductive layer comprises an individual electrode, a comb-shaped electrode and a common electrode; the heating resistor layer comprises a plurality of heating parts which are arranged at intervals along the main scanning direction, one end of the comb-shaped electrode along the sub-scanning direction is connected with the heating parts, and the other end of the comb-shaped electrode is electrically connected with the common electrode; one end of the individual electrode along the sub-scanning direction is connected with the heating part, and the other end is connected with a control IC;

2. The thermal head according to claim 1, wherein any one of the following (a) to (c):

(a) the curvature radius of the first arc part is more than or equal to 25 mu m;

(b) the curvature radius of the second arc part is 50-150 mu m;

(c) the curvature radius of the third arc part is 50-150 mu m.

3. The thermal print head of claim 1, further comprising a glaze layer, wherein the glaze layer is disposed on the substrate, the conductive layer is disposed on the glaze layer, and the heating resistor layer is disposed on the conductive layer.

4. The thermal printhead of claim 3, wherein said individual electrodes and said comb electrodes are spaced apart from each other.

5. The thermal print head of claim 1, further comprising a glass glaze layer disposed on the substrate, wherein the heating resistor layer is disposed on the glass glaze layer, and wherein the conductive layer is disposed on the heating resistor layer.

6. The thermal print head according to claim 5, wherein the individual electrodes and the comb-shaped electrodes are connected through a heat generating portion.

7. A thermal print head is characterized by comprising a substrate, a conducting layer and a heating resistance layer; the conducting layer comprises individual electrodes and a folded middle electrode, the heating resistance layer comprises a plurality of heating parts which are arranged at intervals along the main scanning direction, one end of each two adjacent individual electrodes along the sub-scanning direction is respectively connected with the two adjacent heating parts, and the other end of each two adjacent individual electrodes is respectively connected with the control IC and the power supply; the folded middle electrode is connected with two adjacent heating parts and is respectively in a folded shape;

the folded part is provided with a fourth arc part;

8. The thermal print head according to claim 7, wherein any one of the following (d) to (f):

(d) the curvature radius of the fourth arc part is more than or equal to 25 mu m;

(e) the curvature radius of the fifth arc part is 50-150 mu m;

(f) the curvature radius of the sixth arc part is 50-150 mu m.

9. The thermal print head of claim 7, further comprising a glass glaze layer, wherein the glass glaze layer is disposed on the substrate, the heating resistor layer is disposed on the glass glaze layer, and the conductive layer is disposed on the heating resistor layer.

10. The thermal print head according to claim 7, further comprising a protective layer covering said heat-generating resistive layer and at least a part of said conductive layer.