CN215096451U

CN215096451U - Thermal printing head and printing device

Info

Publication number: CN215096451U
Application number: CN202120420499.7U
Authority: CN
Inventors: 夏国信; 孙华刚; 张东娜
Original assignee: Shandong Hualing Electronics Co Ltd
Current assignee: Shandong Hualing Electronics Co Ltd
Priority date: 2021-02-25
Filing date: 2021-02-25
Publication date: 2021-12-10
Anticipated expiration: 2031-02-25

Abstract

The utility model relates to a temperature sensing printing device technical field specifically discloses a temperature sensing printer head and printing device. The thermal printing head comprises a heating component, a control component and a connecting socket; the heating assembly can generate heat, an insulating protective film is arranged on the top surface of the heating assembly, a conductive protective film covers the insulating protective film, and a detection lead is arranged between the insulating protective film and the conductive protective film; the control assembly is used for controlling the heating assembly and comprises a static induction unit, a detection lead is electrically connected with the static induction unit, the static induction unit can detect the static potential difference of the conductive protective film, and when the static potential difference exceeds a safety threshold value, the static induction unit sends an abnormal signal; the connection socket is in communication connection with the control assembly and is used for being connected with input equipment. The static induction unit can be used for detecting the static voltage on the surface of the conductive protective film and sending an abnormal signal when the static exceeds the standard, so that poor printing of the printing device caused by static damage is prevented.

Description

Thermal printing head and printing device

Technical Field

The utility model relates to a thermal printing device technical field especially relates to a thermal printing head and printing device.

Background

In the process of thermal printing, an upper protective film of a thermal printing head is in direct contact with a printing medium, static electricity is easily generated due to friction between the printing medium and the protective film, peeling between the printing medium and the protective film, drying of a printing environment and the like, and when static electricity is continuously accumulated on the surface of the protective film and forms a certain potential difference, the static electricity can break down the protective film to damage a heating resistor belt; meanwhile, after the heating resistor body is broken down, static charges can enter the printing control chip, the external power supply, the motor and the control part of the printing control chip along the individual electrodes to influence the printing control chip, the external power supply, the motor and the control part, and can be damaged in serious cases to cause abnormal printing, so that the use occasions of the thermal printing head are greatly limited, and the service life is shortened.

Because printing media and printers in the market have various working environments, the surrounding environment of some printers is dry or static electricity is easily generated when the surface of the printing media contacts with a thermal paper printing head, so that the thermal printing head is damaged by the static electricity. With the wider application of thermal printing and the diversification of printing environment and printing media, electrostatic destruction of the printing head has become an important factor of poor printing.

In the prior art, design improvement is often made on the structural characteristics of the thermal print head to achieve the purpose of relieving the accumulation of static electricity or conducting the static electricity to the area outside the thermal print head, but the method does not eliminate or reduce the generation of the static electricity, and the thermal print head still has the possibility of electrostatic damage through accumulation of long-term printing.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a thermal print head and printing device to reduce the risk that the thermal print head took place the electrostatic destruction.

To achieve the purpose, the utility model adopts the following technical proposal:

a thermal print head comprises a heating component, a control component and a connecting socket; the heating assembly can generate heat, an insulating protective film is arranged on the top surface of the heating assembly, a conductive protective film is covered on the insulating protective film, and a detection lead is arranged between the insulating protective film and the conductive protective film; the control assembly is used for controlling the heating assembly and comprises a static induction unit, the detection lead is electrically connected with the static induction unit, the static induction unit can detect the static potential difference of the conductive protective film, and when the static potential difference exceeds a safety threshold value, the static induction unit sends an abnormal signal; the connection socket is in communication connection with the control assembly and is used for being connected with input equipment.

The static induction unit is a static induction chip, the static induction chip is installed on the control assembly, and the static induction chip is grounded.

Furthermore, the detection wires and the electrostatic induction chips are arranged in groups, and a plurality of groups are arranged.

Preferably, the heating element includes a substrate, a ground glaze layer is provided on the substrate, a heating resistor and a wire pattern are provided on the ground glaze layer, a common electrode is further provided on the ground glaze layer, individual electrodes are provided on the ground glaze layer and the upper surface of the substrate, the heating resistor is disposed between the common electrode and the individual electrodes, one end of the common electrode is connected to the heating resistor, and the other end of the common electrode is connected to the wire pattern; one end of each individual electrode is connected with the heating resistor, and the other end of each individual electrode is connected with the control component; and the upper surface of the substrate is provided with the insulating protective film covering the heating resistor, the common electrode and part of the individual electrodes, and the thickness of the insulating protective film is 4-10 mu m.

Preferably, the conductive protective film is a thin film of carbon-silicon carbide or a thick film of a material including ruthenium.

Preferably, the safety threshold of the electrostatic potential difference is adjustable within the range of 1kV to 4 kV.

Preferably, the electrostatic induction chip can detect the electrostatic potential difference in a range of 0.1kV to 10 kV.

Preferably, the thickness of the detection lead is 0.3-0.6 μm, and the width of the detection lead is 10-20 μm.

Preferably, the thickness of the conductive protective film is 0.5-5 μm, and the surface resistance is 10k Ω -10 m Ω.

A printing device comprises the thermal printing head.

The utility model has the advantages that:

when carrying out thermal printing to the print media, the last electrically conductive protection film and the print media direct contact of thermal print head, because the friction between print media and the electrically conductive protection film, the peel off of print media and electrically conductive protection film and the drying of printing environment etc. reason can produce static easily, when static charge constantly accumulates and forms certain potential difference on electrically conductive protection film surface, utilize static induction element can detect electrically conductive protection film surface static voltage, and can send abnormal signal when static exceeds standard, thereby prevent to print device bad because of static destruction causes, avoid the thermal print head to be destroyed by electrostatic shock.

Drawings

Fig. 1 is a schematic structural diagram of a thermal print head according to an embodiment of the present invention;

fig. 2 is a top view of a heat generating component according to an embodiment of the present invention;

fig. 3 is a cross-sectional view of a heat generating component according to an embodiment of the present invention;

fig. 4 is a schematic structural diagram of a printing apparatus according to an embodiment of the present invention.

In the figure:

100. a thermal print head; 110. a heat generating component; 111. a substrate; 112. a ground coat layer; 113. a heating resistor; 115. an insulating protective film; 116. detecting a lead; 117. a conductive protective film; 118. a common electrode; 119. individual electrodes; 120. a control component; 121. a static induction unit; 122. a print control unit; 130. a connection socket; 140. a printhead chassis;

200. an ion blower; 300. a printing device base; 310. printing a rubber roller; 400. printing the medium.

Detailed Description

In order to make the technical problem solved by the present invention, the technical solutions adopted by the present invention and the technical effects achieved by the present invention clearer, the following will be described in further detail with reference to the accompanying drawings, and obviously, the described embodiments are only some embodiments of the present invention, but not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by the skilled in the art without creative work belong to the protection scope of the present invention.

In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, detachably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

The technical solution of the present invention is further explained by the following embodiments with reference to the accompanying drawings.

As shown in fig. 1 to 3, the present embodiment provides a thermal print head 100, which includes a heat generating component 110, a control component 120, and a connection socket 130; the heating element 110 can generate heat, an insulating protective film 115 is arranged on the top surface of the heating element, a conductive protective film 117 is covered on the insulating protective film 115, and a detection lead 116 is arranged between the insulating protective film 115 and the conductive protective film 117; the control component 120 is used for controlling the heating component 110, the control component 120 includes a static induction unit 121, the detection wire 116 is electrically connected to the static induction unit 121, the static induction unit 121 can detect the static potential difference of the conductive protective film 117, and when the static potential difference exceeds a safety threshold, the static induction unit 121 sends an abnormal signal; connection socket 130 is communicatively coupled to control assembly 120, and connection socket 130 is configured to couple to an input device. When the printing medium 400 is subjected to thermal printing, the conductive protective film 117 on the thermal printing head 100 is in direct contact with the printing medium 400, static electricity is easily generated due to friction between the printing medium 400 and the conductive protective film 117, peeling between the printing medium 400 and the conductive protective film 117, drying of a printing environment and the like, when the static electricity is continuously accumulated on the surface of the conductive protective film 117 and forms a certain potential difference, the static electricity induction unit 121 can be used for detecting the static voltage on the surface of the conductive protective film 117 and sending an abnormal signal when the static electricity exceeds the standard, so that poor printing of a printing device caused by static electricity damage is prevented, and the thermal printing head 100 is prevented from being damaged by static electricity impact. Preferably, the control unit 120 includes a printed wiring board, and the conductive protective film 117 has high sheet resistance and good abrasion resistance.

Specifically, the width of the detection wire 116 is 10 to 20 μm, and the thickness is 0.3 to 0.6 μm; the thickness of the insulating protective film 115 is 4 to 10 μm, and the thickness of the conductive protective film 117 is 0.5 to 5 μm.

In the present embodiment, the static electricity induction unit 121 is a static electricity induction chip, and the static electricity induction chip is mounted on the control component 120 and is grounded. Specifically, the electrostatic induction chip can detect the electrostatic potential difference within the range of 0.1kV to 10 kV; and the electrostatic induction chip is arranged on the printed circuit board. The electrostatic induction chip has simple structure and low production cost.

Preferably, the detection wires 116 are arranged in groups with the electrostatic induction chips, and there are multiple groups. The arrangement of the multiple groups of detection wires 116 and the electrostatic induction chip can detect the electrostatic voltages at multiple different positions on the conductive protective film 117, so that the detection effect is further ensured. Specifically, two sets of the detection wires 116 and the electrostatic induction chip are provided. Different printing heads and different areas of the printing heads have different electrostatic impact resistance, different safety thresholds can be set according to requirements, and the safety threshold of electrostatic potential difference can be adjusted within the range of 1 kV-4 kV.

As shown in fig. 2 and 3, the heating element 110 includes a substrate 111, a ground coat layer 112 provided on the substrate 111, a heating resistor 113 and a wiring pattern provided on the ground coat layer 112, a common electrode 118 provided on the ground coat layer 112, individual electrodes 119 provided on the ground coat layer 112 and the substrate 111, the heating resistor 113 disposed between the common electrode 118 and the individual electrodes 119, one end of the common electrode 118 connected to the heating resistor 113, and the other end connected to the wiring pattern; one end of the individual electrode 119 is connected to the heating resistor 113, and the other end thereof is connected to the control unit 120; an insulating protective film 115 is provided on the upper surface of the substrate 111 to cover the heating resistor 113, the common electrode 118, and a part of the individual electrode 119. The above arrangement enables the heat-generating resistor 113 to perform a heat-generating process according to the requirements of the control unit 120. Specifically, the substrate 111 is made of ceramic, the heating resistor 113 is a strip resistor, and the individual electrode 119 and the detection wire 116 are disposed perpendicular to the extending direction of the strip resistor.

Preferably, the conductive protective film 117 is a thin film of carbon-silicon carbide or a thick film of a material including ruthenium. The above arrangement ensures high sheet resistance and good wear resistance of the conductive protective film 117. Specifically, the surface resistance of the conductive protective film 117 is 10k Ω to 10m Ω.

With continued reference to fig. 1, the control component 120 further includes a print control unit 122, and the print control unit 122 is configured to control the heat-generating resistor 113 to generate heat. Specifically, the print control unit 122 includes a print control chip, which is mounted on the printed wiring board.

Preferably, the thermal print head 100 further comprises a print head base 140, and the heat generating component 110, the control component 120 and the connection socket 130 are mounted on the print head base 140. The arrangement of the print head base 140 enables the thermal print head 100 to be structurally stable, and avoids the risk of position deviation of each structure on the thermal print head 100 caused by accidents.

As shown in fig. 4, the embodiment further provides a printing apparatus, which includes a printing apparatus base 300, and the printing apparatus base 300 is mounted with a printing medium 400 and the thermal printhead 100. Specifically, the printing medium 400 is thermal paper.

Preferably, the ion blower 200 is further mounted on the printing apparatus base 300, and the ion blower 200 can dissipate static electricity on the thermal print head 100. The ion blower 200 can perform an emergency static electricity removal measure, thereby reducing the probability of occurrence of a print failure.

Preferably, the printing rubber roller 310 is connected to the printing apparatus base 300, and the printing rubber roller 310 is used for limiting the position of the printing medium 400, so that the printing medium 400 abuts against the thermal print head 100. Specifically, the printing roller 310 is rotatably connected to the printing apparatus base 300. The printing roller 310 is arranged to facilitate the printing operation, and the situation that the printing medium 400 is in the wrong position due to accidents is reduced.

In this embodiment, the input device includes an alarm unit in communication with the static electricity induction unit 121, and the alarm unit can receive the abnormal signal and send an alarm message. When the static induction unit 121 detects that the static on the surface of the conductive protective film 117 exceeds the standard, the alarm unit sends out alarm information, and simultaneously controls the ion blower 200 to work to perform an emergency static electricity removal measure. By means of the arrangement of the alarm unit, an operator can quickly know the problems of the printing device, the operator can conveniently and timely stop printing operation, and the device can be maintained subsequently. Specifically, the alarm unit is a horn.

It is obvious that the above embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A thermal print head, comprising:

the heating element (110) can generate heat, an insulating protective film (115) is arranged on the top surface of the heating element (110), a conductive protective film (117) is covered on the insulating protective film (115), and a detection lead (116) is arranged between the insulating protective film (115) and the conductive protective film (117);

the control component (120) is used for controlling the heating component (110), the control component (120) comprises a static induction unit (121), the detection lead (116) is electrically connected with the static induction unit (121), the static induction unit (121) can detect the static potential difference of the conductive protective film (117), and when the static potential difference exceeds a safety threshold value, the static induction unit (121) sends an abnormal signal;

a connection socket (130) communicatively coupled with the control assembly (120), the connection socket (130) for coupling with an input device.

2. The thermal print head according to claim 1, wherein the static electricity induction unit (121) is a static electricity induction chip, the static electricity induction chip is mounted on the control component (120), and the static electricity induction chip is grounded.

3. The thermal print head according to claim 2, wherein the sensing leads (116) are arranged in groups with the electrostatic induction chips, and there are a plurality of groups.

4. The thermal print head according to claim 1, wherein the heating element (110) comprises a substrate (111), a ground coat layer (112) is provided on the substrate (111), a heating resistor (113) and a wiring pattern are provided on the ground coat layer (112), a common electrode (118) is further provided on the ground coat layer (112), individual electrodes (119) are provided on the ground coat layer (112) and the upper surface of the substrate (111), the heating resistor (113) is disposed between the common electrode (118) and the individual electrodes (119), one end of the common electrode (118) is connected to the heating resistor (113), and the other end thereof is connected to the wiring pattern; one end of the individual electrode (119) is connected with the heating resistor (113), and the other end of the individual electrode is connected with the control component (120); the insulating protective film (115) covering the heating resistor (113), the common electrode (118), and a portion of the individual electrode (119) is provided on the upper surface of the substrate (111), and the thickness of the insulating protective film (115) is 4 to 10 μm.

5. A thermal print head according to claim 1, wherein the conductive protective film (117) is a thin film of carbon-silicon carbide or a thick film of a material including ruthenium.

6. The thermal print head according to claim 1, wherein the safety threshold of the electrostatic potential difference is adjustable within a range of 1kV to 4 kV.

7. The thermal print head according to claim 2, wherein the electrostatic induction chip is capable of detecting an electrostatic potential difference in a range of 0.1kV to 10 kV.

8. The thermal print head according to claim 3, wherein the detection wire (116) has a thickness of 0.3 to 0.6 μm and a width of 10 to 20 μm.

9. The thermal head according to claim 5, wherein the conductive protective film (117) has a thickness of 0.5 to 5 μm and a surface resistance of 10k Ω to 10m Ω.

10. A printing apparatus comprising a thermal print head according to any one of claims 1 to 9.