CN220087506U - Multilayer film electric heater - Google Patents

Abstract

The multilayer film electric heater comprises a plurality of heating units, wherein each heating unit consists of a basal layer, a conducting layer and an electrode layer, the conducting layer is arranged on the surface of the basal layer, the basal layer is made of dielectric materials, the conducting layer has surface resistivity below 500ohm/sq, the conducting layer is divided into a plurality of conducting areas which are arranged in an insulating way according to a region to be heated, the electrode layer is provided with a plurality of power transmission electrode contacts and a plurality of grounding electrode contacts and is electrically connected with the conducting areas on the conducting layer, and when the electrode layer is electrified, the conducting areas on the conducting layer form a local heating area respectively; the heating units are integrated in an insulating lamination mode, so that the heating working face is formed by the local heating units. Therefore, the heat in the heating working surface can be uniformly distributed, the heating efficiency is improved, and the defect of structural damage caused by heat stress concentration is avoided.

Description

Multilayer film electric heater

Technical Field

The utility model relates to the technical field of electric heating, in particular to a multilayer thin film electric heater.

Background

The temperature difference can cause moisture to condense on the surface of the glass, and the glass is used as an automobile windshield, if the moisture condenses on the automobile windshield, atomization can cause visual obstruction of a driver to endanger driving safety, and therefore, demisters are arranged on the automobile windshield and can heat the glass to evaporate fog remained on the windshield; such defoggers are also used for defogging the lenses of image capturing devices in the automotive autopilot or protective lenses of various sensors.

In the early-stage vehicle demister, a plurality of demisting wires made of metal materials are attached to a windshield of an automobile, and all the demisting wires are arranged in parallel, and when the vehicle demister is electrified, an electrothermal conversion effect is generated by the resistance of the demisting wires so as to heat the windshield of the automobile, so that fog attached to the windshield is dissipated; however, when the demister operates, the heating area is concentrated near the demisting line, and other positions without the demisting line are heated slowly by heat conduction, so that besides the time required for demisting is prolonged, the condition of uneven heat distribution can cause internal stress to the windshield, and the glass is easy to break after long-term repeated operation, so that the driving safety is compromised. Furthermore, the demisting lines of the conventional demister are made of opaque metal materials, so that a plurality of demisting lines are attached to the windshield, thereby not only having adverse effects on the beauty, but also causing obstruction to the visual field of a driver and adverse driving safety. In order to solve the problems of view obstruction and poor appearance caused by embedding the conventional metal wires into the windshield, the current industry has replaced the metal wires with strip-shaped transparent conductive films, however, the conventional method has changed to a method in which a plurality of strip-shaped transparent conductive films are used as heating sources, so that the problem of the sharpness of the windshield can be effectively solved, but the phenomenon of uneven distribution of heating effect in the heating process and the defect of long defogging time can not be improved.

Disclosure of Invention

In view of the above-mentioned problems, a primary object of the present utility model is to provide a multi-layer thin film electric heater composed of a plurality of stacked heating units, which can uniformly distribute heat in a heating surface, improve heating efficiency, avoid the defect of structural damage caused by heat stress concentration, and easily adjust the heat distribution in the heating surface so as to adjust the amount of heat generated at a certain position in the heating surface.

In order to achieve the above object, the present utility model provides a multi-layer thin film electric heater, which comprises a plurality of heating units, wherein the heating units comprise a substrate layer, a conductive layer and an electrode layer, the conductive layer is arranged on the surface of the substrate layer, the substrate layer is made of dielectric materials, the conductive layer has a surface resistivity below 500ohm/sq, the conductive layer is divided into a plurality of conductive blocks arranged in an insulating manner according to a region to be heated, the electrode layer is provided with an electrode pattern arranged corresponding to the conductive blocks of the conductive layer, the electrode pattern comprises a power transmission electrode and a grounding electrode, the power transmission electrode is provided with a plurality of power transmission electrode contacts, the plurality of power transmission electrode contacts are respectively and electrically connected to one ends of the conductive blocks, the grounding electrode is provided with a plurality of grounding electrode contacts, the plurality of grounding electrode contacts are respectively and electrically connected to the other ends of the conductive blocks, and when the electrode layer is electrified, the plurality of conductive blocks on the conductive layer form a local heating area; the heating units are respectively provided with the local heating areas arranged at different positions, and the heating units are integrated in an insulating lamination mode, so that the local heating areas form a heating working surface.

The substrate layer is made of one of glass, polyethylene terephthalate (PET), polycarbonate (PC), polymethyl methacrylate (PMMA), polyethylene (PE), polystyrene (PS), polypropylene (PP), polyvinyl chloride (PVC), polyimide (PI) or Polyurethane (PU), but the range of the materials is not limited to the above materials, and various soft, hard or flexible transparent substrates are suitable.

Wherein, the material of the conductive layer is selected from one of metal oxide film, silver halide film, nano silver film or nano carbon tube film, but not limited thereto; the material of the metal oxide film is selected from one of Indium Tin Oxide (ITO), indium Zinc Oxide (IZO), zinc aluminum oxide (AZO), tin antimony oxide (ATO) or polyethylene dioxythiophene (PEDOT), but the implementation range is not limited by the above materials; preferably, the surface resistivity of the conductive layer is between 5ohm/sq and 100 ohm/sq.

The electrode layer is made of silver colloid or high-conductivity metal colloid, and the electrode pattern is formed in a coating or printing mode.

In an embodiment, the upper surface and the lower surface of the substrate layer of the heating unit are respectively provided with the conductive layer and the electrode layer.

This summary presents some selected concepts in a simplified form as a further described below in the detailed description. This summary is not intended to identify key features or essential features of the claimed subject matter, nor is it intended to be used to limit the scope of the claimed subject matter.

Drawings

Fig. 1 is a plan view of an embodiment of the present utility model.

FIG. 2 is a side sectional view of FIG. 1 at the section II-II, showing a schematic view of the laminated structure according to an embodiment of the present utility model.

FIG. 3 is a plan view of a coherent thermal unit according to an embodiment of the present utility model.

FIG. 4 is a plan view of a further heat transfer unit according to an embodiment of the present utility model.

FIG. 5 is a schematic diagram of a stacked structure of another embodiment of a heating unit according to the present utility model.

Fig. 6 is a plan view of another embodiment of a heating unit according to the present utility model.

Fig. 7 is a plan view of yet another embodiment of a heating unit according to the present utility model.

Symbol description in the drawings:

1. a multilayer thin film electric heater;

2, vehicle window glass;

10. 20, 50, 60 heating units;

30 adhesive layers;

11. 21, 51 base layer;

12. 22, 52, 54 conductive layers;

121. 122, 123, 124, 221, 222, 223, 224, 621, 622, 623, 624 conductive blocks;

13. 23, 53, 55 electrode layers;

13a, 23a, 631a, 632a, 633a, 634 a;

13b, 23b, 631b, 632b, 633b, 634b ground electrodes;

13a1, 13a2, 13a3, 13a4, 23a1, 23a2, 23a3, 23a4, 631a1, 632a1, 633a1, 634a1 power transmission pole contacts;

13b1, 13b2, 13b3, 13b4, 23b1, 23b2, 23b3, 23b4, 631b1, 632b1, 633b1, 634b1 ground electrode contacts;

h101, H102, H103, H104, H201, H202, H203, H204, H501, H502, H503, H504, H505, H506, H507, H508, H601, H602, H603, H604 localized heat generating regions;

HA heats the working surface.

Detailed Description

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate preferred embodiments of the utility model and, together with the description, serve to explain the principles of the utility model; irrelevant details are not drawn yet for the sake of brevity of the drawing.

Fig. 1 to 4 illustrate a preferred embodiment of the present utility model, in which a multi-layer thin film heater 1 is coated on a window glass 2 or used before an image lens and a sensor protection lens to provide heating and mist elimination effects; the multilayer thin film electric heater 1 comprises two heating units 10, 20, each heating unit being in the form of a thin layer; wherein:

the heating unit 10 comprises a substrate layer 11, a conductive layer 12 and an electrode layer 13; the base layer 11 is a thin layer having dielectric properties and high light transmittance, and is made of, for example, a glass sheet or a flexible polyethylene terephthalate (PET) film; the conductive layer 12 is disposed on one surface of the substrate layer 11, the conductive layer 12 is an Indium Tin Oxide (ITO) film with transparent property, the surface resistivity is below 500ohm/sq, preferably, the surface resistivity is between 5ohm/sq and 100ohm/sq, and the conductive layer 12 is divided into a plurality of conductive areas 121, 122, 123, 124 which are disposed in an insulating manner according to the area to be heated; the electrode layer 13 is provided with an electrode pattern, the electrode pattern can be arranged according to a conductive circuit formed in a region to be heated, the material of the electrode layer is selected from silver colloid or high-conductivity metal colloid, and the electrode pattern is formed in a coating or printing mode; the electrode pattern includes a horizontal electrode 13a and a ground electrode 13b, the electrode 13a has a plurality of electrode contacts 13a1, 13a2, 13a3, 13a4, the electrode contacts 13a1-13a4 are electrically connected to one ends of the conductive blocks 121-124, respectively, and the ground electrode 13b has a plurality of ground electrode contacts 13b1, 13b2, 13b3, 13b4, and the ground electrode contacts 13b1-13b4 are electrically connected to the other ends of the conductive blocks 121-124, respectively. As shown in fig. 1 to 3, the heating unit 10 is formed by laminating the base layer 11, the conductive layer 12 and the electrode layer 13, when the electrode layer 13 is energized, the conductive block 121 between the power electrode contact 13a1 and the ground electrode contact 13b1 performs the electrothermal conversion to generate heat energy, so as to form a local heating area H101, and correspondingly, the other conductive blocks 122, 123, 124 on the conductive layer 12 and the local heating areas H102, H103, H104 are also formed between the power electrode contacts 13a2, 13a3, 13a4 and the ground electrode contacts 13b2, 13b3, 13b 4.

Referring to fig. 1, 2 and 4, the heating unit 20 includes a substrate layer 21, a conductive layer 22 and an electrode layer 23, and the main difference is that the conductive areas of the conductive layer 22 and the electrode pattern of the electrode layer 23 of the heating unit 20 are arranged in comparison with the structure of the heating unit 10, and other structures of the conductive areas and the electrode pattern of the electrode layer 23 are not repeated herein; in this embodiment, the conductive layer 22 is divided into a plurality of conductive blocks 221, 222, 223, 224 arranged in an insulating manner according to the region to be heated, and the electrode pattern on the electrode layer 23 includes a vertically arranged power electrode 23a and a ground electrode 23b, the power electrode 23a has a plurality of power electrode contacts 23a1, 23a2, 23a3, 23a4, the power electrode contacts 23a1-23a4 are electrically connected to one ends of the conductive blocks 221-224, respectively, and the ground electrode 23b has a plurality of ground electrode contacts 23b1, 23b2, 23b3, 23b4, and the ground electrode contacts 23b1-23b4 are electrically connected to the other ends of the conductive blocks 221-224, respectively; when the electrode layer 23 of the heating unit 20 is energized, the conductive areas 221, 222, 223, 224 on the conductive layer 22 form local heat generating areas H201, H202, H203, H204, respectively.

As shown in fig. 1 and 2, the multilayer thin film electric heater 1 uses an adhesive layer 30 to integrally laminate the heating unit 10 and the heating unit 20, and the two heating units are arranged in an insulating manner; the adhesive layer 30 is made of transparent adhesive material selected from optical adhesive (OCA) or optical liquid adhesive (OCR), but the implementation range is not limited to the above materials; the heating units 10 and 20 are respectively provided with the local heating areas H101-H104 and H201-H204 arranged at different positions, so that the heating working surface HA with a larger heating area range can be formed by overlapping the multi-layer thin film electric heater 1.

Accordingly, the utility model can enlarge the range of the heating working surface by increasing a plurality of local heating areas on the heating unit and/or increasing the lamination number of the heating unit on the multi-layer thin film electric heater; in other words, the present utility model may also adjust the distribution position of the local heating area set on the heating unit, or change the shape setting of the local heating area, and/or adjust the lamination and combination style of the heating unit of the multi-layer thin film electric heater, so as to adjust and control the heating value or the distribution pattern of the heat in the local area in the heating working surface HA, for example: the distribution position of the local heating area is regulated and controlled to be uniformly distributed in the heating working surface HA, so that the advantages of shortening the heat conduction time and improving the heating efficiency can be obtained, and the problem of structural damage caused by the concentration of derivative thermal stress can be avoided.

Fig. 5 and 6 show another embodiment of a heating unit structure, in which the heating unit 50 has a conductive layer 52 and an electrode layer 53 on the upper surface of a base layer 51, and a conductive layer 54 and an electrode layer 55 on the lower surface of the base layer 51. In the present embodiment, four local heat generating regions H501, H502, H503, H504 are formed on the conductive layer 52 disposed above the heating unit 50, and four local heat generating regions H505, H506, H507, H508 are also formed on the conductive layer 54 below the heating unit 50; in this embodiment, a plurality of local heating areas can be formed on the upper and lower sides of the same substrate layer of the heating unit, which has the advantage of reducing the material and processing costs.

Fig. 7 shows another embodiment of a structure of a heating unit 60, which is substantially the same as the structure of the heating unit 10 described above, and the main difference is that the electrode patterns of the electrode layers are arranged differently, and the portions of the same structure will not be repeated here; in this embodiment, the conductive layer is provided with conductive blocks 621, 622, 623, 624, and the electrode pattern of the electrode layer comprises a plurality of independently arranged power transmission electrodes and ground electrodes, wherein, on the conductive block 621, the power transmission electrode contact 631a1 of the power transmission electrode 631a is electrically connected to one end of the conductive block 621, and the ground electrode contact 631b1 of the ground electrode 631b is electrically connected to the other end of the conductive block 621; similarly, the electrode contacts 632a1, 633a1, 634a1 of the other electrodes 632a, 633a, 634a and the ground electrode contacts 632b1, 633b1, 634b1 of the ground electrodes 632b, 633b, 634b are respectively electrically connected to the conducting areas 622, 623, 624; when the electrode layer is electrified, local heating areas H601, H602, H603 and H604 are respectively formed in the heating unit 60; however, in this embodiment, the power transmission electrodes 631a-634a and the ground electrodes 631b-634b of the electrode layer are all arranged independently in pairs, so that the power supply setting can be independently controlled, and accordingly, the heat generation amount and the heating time of each local heating area can be arbitrarily adjusted according to the use requirement.

Although the present utility model has been described with reference to the above embodiments, it should be understood that the utility model is not limited thereto, but may be variously modified and modified by those skilled in the art without departing from the spirit and scope of the present utility model, and the scope of the present utility model is defined by the following claims.

Claims (8)

1. A multilayer thin film electric heater, comprising a plurality of heating units, wherein each heating unit comprises a substrate layer, a conductive layer and an electrode layer, the conductive layer is arranged on the surface of the substrate layer, the substrate layer is made of dielectric materials, the conductive layer has a surface resistivity of less than 500ohm/sq, the conductive layer is divided into a plurality of conductive blocks which are arranged in an insulating manner according to a region to be heated, the electrode layer is provided with an electrode pattern which is arranged corresponding to the conductive blocks of the conductive layer, the electrode pattern comprises an electrode and a grounding electrode, the electrode has a plurality of electrode contacts which are respectively and electrically connected with one ends of the conductive blocks, the grounding electrode has a plurality of grounding electrode contacts which are respectively and electrically connected with the other ends of the conductive blocks, and when the electrode layer is electrified, the plurality of conductive blocks on the conductive layer form a local heating region respectively; the heating units are respectively provided with the local heating areas arranged at different positions, and the heating units are integrated in an insulating lamination mode, so that the local heating areas form a heating working surface.

2. The multilayer thin film electric heater according to claim 1, wherein the substrate layer is made of a material selected from one of glass, polyethylene terephthalate, polycarbonate, polymethyl methacrylate, polyethylene, polystyrene, polypropylene, polyvinyl chloride, polyimide, and polyurethane.

3. The multilayer thin film electric heater according to claim 1, wherein the conductive layer is one of a metal oxide thin film, a silver halide thin film, a nano-silver thin film, or a nano-carbon tube thin film.

4. The multilayer thin film electric heater according to claim 3, wherein the material of the metal oxide thin film is selected from one of indium tin oxide, indium zinc oxide, zinc aluminum oxide, and tin antimony oxide.

5. The multilayer thin film electric heater according to claim 1, wherein the conductive layer has a sheet resistivity of 5

Between ohm/sq and 100 ohm/sq.

6. The multi-layered thin film electric heater according to claim 1, wherein the material of the electrode layer is a metal colloid of high conductivity, and the electrode pattern is formed in a coating or printing manner.

7. The multilayer thin film electric heater according to claim 6, wherein the high conductivity metal colloid is silver colloid.

8. The multilayer thin film electric heater according to claim 1, wherein the conductive layer and the electrode layer are provided on the upper surface and the lower surface of the base layer of the heating unit, respectively.