阅读说明：本技术 一种可电加热的玻璃窗 (Glass window capable of being electrically heated ) 是由 曹晖 曾东 张朋辉 福原康太 陈国富 于 2019-09-18 设计创作，主要内容包括：本发明涉及玻璃加热技术领域,特别是通过透明导电膜进行加热的汽车玻璃,具体地提供一种可电加热的玻璃窗。该玻璃窗包括外玻璃板、热塑性中间层和内玻璃板,在外玻璃板的表面上沉积透明导电膜,还包括至少两个导电电极；在至少一个导电电极的下方设置深色遮蔽层,在深色遮蔽层的至少局部表面上沉积有透明导电膜,深色遮蔽层的沉积有透明导电膜的表面至少局部为厚度渐变段。本发明能够实现透明导电膜从玻璃表面到深色遮蔽层的表面连续过渡,消除了透明导电膜的局部发生“断裂”的现象,提高了透明导电膜的导电连续性和电加热效果,同时还能够提高可电加热的玻璃窗的生产效率和产品质量。(The invention relates to the technical field of glass heating, in particular to automobile glass heated through a transparent conductive film, and particularly provides an electrically heatable glass window. The glass window comprises an outer glass plate, a thermoplastic interlayer and an inner glass plate, wherein a transparent conductive film is deposited on the surface of the outer glass plate, and the glass window also comprises at least two conductive electrodes; and a dark color shielding layer is arranged below at least one conductive electrode, a transparent conductive film is deposited on at least part of the surface of the dark color shielding layer, and at least part of the surface of the dark color shielding layer on which the transparent conductive film is deposited is a thickness gradient section. The invention can realize the continuous transition of the transparent conductive film from the glass surface to the surface of the dark shielding layer, eliminates the phenomenon of local fracture of the transparent conductive film, improves the conductive continuity and the electric heating effect of the transparent conductive film, and simultaneously can improve the production efficiency and the product quality of the glass window capable of being electrically heated.)

1. An electrically heatable glazing comprising an outer glass pane, a thermoplastic interlayer and an inner glass pane, the thermoplastic interlayer being sandwiched between the outer glass pane and the inner glass pane, a transparent conductive film being deposited on the surface of the outer glass pane in contact with the thermoplastic interlayer, and at least two conductive electrodes electrically connected to the transparent conductive film; the method is characterized in that: and a dark color shielding layer is arranged below at least one conductive electrode, the dark color shielding layer is arranged on the surface of the outer glass plate, which is in contact with the thermoplastic middle layer, the transparent conductive film is deposited on at least part of the surface of the dark color shielding layer, on which the transparent conductive film is deposited, is a thickness gradient section, and the thickness of the thickness gradient section is gradually increased from one end close to the center of the outer glass plate to one end far away from the center of the outer glass plate.

2. An electrically heatable glazing as claimed in claim 1 wherein: the width of the thickness gradient section of the dark shielding layer is 1.5-1000 times of the maximum thickness of the thickness gradient section.

3. An electrically heatable glazing as claimed in claim 1 wherein: the width of the thickness gradient section of the dark shielding layer is 3-300 times of the maximum thickness of the thickness gradient section.

4. An electrically heatable glazing as claimed in claim 1 wherein: the transparent conductive film is a metal coating film, a metal alloy coating film or a transparent conductive oxide coating film.

5. An electrically heatable glazing as claimed in claim 1 wherein: the conductive electrode is a metal foil and/or a conductive silver paste, and the silver content of the conductive electrode containing the conductive silver paste is at least 90%.

6. An electrically heatable glazing as claimed in claim 1 wherein: the whole dark shielding layer is a thickness gradient section.

7. An electrically heatable glazing as claimed in claim 1 wherein: the dark shielding layer comprises at least one thickness gradient section and at least one uniform thickness section, and the thickness of the thickness gradient section deposited with the transparent conductive film is gradually increased from one end close to the center of the outer glass plate to one end far away from the center of the outer glass plate.

8. an electrically heatable glazing as claimed in claim 1 wherein: the dark shielding layer is made of dark ink, and the color of the dark shielding layer is black or brown.

9. An electrically heatable glazing as claimed in claim 1 wherein: and a second dark color shielding layer is arranged on the surface of the inner glass plate, which is in contact with the thermoplastic middle layer, and/or the surface of the inner glass plate, which is far away from the thermoplastic middle layer, and the second dark color shielding layer is made of dark color ink.

10. An electrically heatable glazing as claimed in claim 1 wherein: and a dot-shaped ink area is arranged on the surface of the inner glass plate, which is in contact with the thermoplastic middle layer, and/or the surface of the inner glass plate, which is far away from the thermoplastic middle layer, and comprises a plurality of ink dots formed by dark ink and spaced from each other.

11. An electrically heatable glazing as claimed in any one of claims 8, 9 or 10, characterised in that: the particle size of the ink of the dark ink is 0.1-10 mu m.

12. An electrically heatable glazing as claimed in claim 1 wherein: the surface roughness Ra of the dark shielding layer is 0.1-4.0 mu m.

13. An electrically heatable glazing as claimed in claim 1 wherein: the surface roughness Ra of the dark shielding layer is 0.3-1.2 mu m.

14. An electrically heatable glazing as claimed in claim 1 wherein: the surface roughness Ra of the dark shielding layer is 0.6-1.0 μm.

15. An electrically heatable glazing as claimed in claim 1 wherein: the sheet resistance of the transparent conductive film on at least partial surface of the dark shielding layer is 1.8-3.2 times of the sheet resistance of the transparent conductive film on the surface of the outer glass plate contacted with the thermoplastic middle layer.

The technical field is as follows:

The invention relates to the technical field of glass heating, in particular to automobile glass heated through a transparent conductive film, and particularly provides an electrically heatable glass window.

Background art:

In order to ensure the safety and comfort of automobile driving, the automobile glass is often required to have a heating function, for example, a transparent conductive film can be arranged on the automobile glass, and the automobile glass is heated by the transparent conductive film so as to realize the function of quickly defrosting and demisting. Generally, an automotive glass provided with a transparent conductive film is a laminated glass, and the transparent conductive film is located between an outer glass plate and an inner glass plate of the laminated glass, that is, the transparent conductive film is provided on one surface (second surface) of the outer glass plate close to the interior of the vehicle or on one surface (third surface) of the inner glass plate close to the exterior of the vehicle.

In the process of the technical development of automobile heating glass, a transparent conductive film is arranged on one surface of an outer glass plate close to the inside of an automobile in the early stage, for example, patents CN88100933A, US4820902A, US4918288A, US4939348A, US5028759A, US5070230A and US5346770A all refer to arranging the transparent conductive film on one surface (second surface) of the outer glass plate close to the inside of the automobile, because opaque ink with a shielding effect needs to be printed on the same surface in consideration of the beauty of the automobile glass, the thickness of the printed ink is usually about 100 times of the thickness of the transparent conductive film, so that step faults are inevitably generated at the interface between the transparent conductive film and the printed ink, and the step faults easily cause local 'fracture' of the transparent conductive film in the heating or vibrating process, thereby causing abnormal temperature or local heating failure of a 'fracture' position, thus leading to high production process requirements of the transparent conductive film and low yield of actual products, and are limited by the technical conditions at the time, and the patented technologies are not applied to the actual automobile heating products on a large scale.

In order to solve the above-mentioned problems of the transparent conductive film and the printing ink on the same surface, the prior art has a transparent conductive film disposed on the inner glass plate on the side close to the outside of the vehicle (third surface), and simultaneously has an ink printed on the outer glass plate on the side close to the inside of the vehicle, so as to avoid the problem of local "breaking" of the transparent conductive film, for example, patent CN1671549A discloses that the conductive coating is disposed on the outer surface of the inner plate called the third surface of the laminate or windshield assembly, and for example, patent CN101921066A discloses that the laminate including the functional layer is disposed on the third surface (the first surface is the outermost side of the vehicle, and the fourth surface is the innermost side), since the third surface, i.e., the side close to the outside of the vehicle, of the inner glass plate is a convex surface, the molding process of the automobile glass adopts a convex surface-down transmission mode, and the convex surface of the glass plate can contact with the, therefore, the glass plate deposited with the transparent conductive film on the third surface cannot be bent and formed in a single-piece mode, and only double-piece gravity forming or double-piece gravity + pressing forming can be adopted, so that the difficulty and the process complexity of bending and forming of the glass plate are increased, the glass molded surface cannot achieve the uniformity of single-piece forming, and the transparent conductive film cannot be suitable for products with large spherical surfaces due to the heat reflection characteristic of the transparent conductive film.

in addition, some automobile front windshield also requires that ink is printed on one surface (fourth surface) of the inner glass plate close to the inside of the automobile, and if a transparent conductive film is continuously arranged on one surface (third surface) of the inner glass plate close to the outside of the automobile, the printing process difficulty of the ink on the fourth surface is increased, and the transparent conductive film is easily damaged in the ink printing process, so that the film surface defect is caused.

The invention content is as follows:

the technical problem to be solved by the invention is to provide an electrically heatable glass window aiming at the defects that when a transparent conductive film is arranged on the second surface of the laminated glass and ink is shielded, the transparent conductive film is partially broken, abnormal temperature or heating failure and the like.

The technical scheme adopted by the invention for solving the technical problems is as follows: an electrically heatable glazing comprising an outer glass pane, a thermoplastic interlayer and an inner glass pane, the thermoplastic interlayer being sandwiched between the outer glass pane and the inner glass pane, a transparent conductive film being deposited on the surface of the outer glass pane in contact with the thermoplastic interlayer, and at least two conductive electrodes electrically connected to the transparent conductive film; the method is characterized in that: and a dark color shielding layer is arranged below at least one conductive electrode, the dark color shielding layer is arranged on the surface of the outer glass plate, which is in contact with the thermoplastic middle layer, the transparent conductive film is deposited on at least part of the surface of the dark color shielding layer, on which the transparent conductive film is deposited, is a thickness gradient section, and the thickness of the thickness gradient section is gradually increased from one end close to the center of the outer glass plate to one end far away from the center of the outer glass plate.

Preferably, the width of the thickness gradient section of the dark shielding layer is 1.5 to 1000 times, and more preferably 3 to 300 times of the maximum thickness of the thickness gradient section.

Preferably, the transparent conductive film is a metal plating film, a metal alloy plating film or a transparent conductive oxide plating film.

Preferably, the conductive electrode is a metal foil and/or a conductive silver paste, and the conductive electrode comprising the conductive silver paste has a silver content of at least 90%.

Preferably, the whole dark shielding layer is a thickness gradient section.

Preferably, the dark shielding layer comprises at least one thickness gradient section and at least one uniform thickness section, and the thickness of the thickness gradient section deposited with the transparent conductive film is gradually increased from one end close to the center of the outer glass plate to one end far away from the center of the outer glass plate.

preferably, the material of the dark shielding layer is dark ink, and the color of the dark shielding layer is black or brown.

Preferably, a second dark shielding layer is arranged on the surface of the inner glass plate, which is in contact with the thermoplastic interlayer, and/or the surface of the inner glass plate, which is far away from the thermoplastic interlayer, and the material of the second dark shielding layer is dark ink.

preferably, a dot-shaped ink area is arranged on the surface of the inner glass plate, which is in contact with the thermoplastic interlayer, and/or on the surface of the inner glass plate, which is far away from the thermoplastic interlayer, and comprises a plurality of ink dots formed by dark-colored ink and spaced from each other.

More preferably, the ink particle size of the dark ink is 0.1 to 10 μm.

Preferably, the dark shielding layer has a surface roughness Ra of 0.1-4.0 μm, more preferably 0.3-1.2 μm, and most preferably 0.6-1.0 μm.

Preferably, the sheet resistance of the transparent conductive film on at least a partial surface of the dark shielding layer is 1.8 to 3.2 times that of the transparent conductive film on the surface of the outer glass plate in contact with the thermoplastic middle layer.

Due to the adoption of the technical scheme, the invention has the following beneficial effects:

The glass window capable of being electrically heated can realize continuous transition of the transparent conductive film from the surface of the glass to the surface of the dark shielding layer, eliminate the phenomenon of local fracture of the transparent conductive film, improve the conductive continuity and the electric heating effect of the transparent conductive film, and simultaneously improve the production efficiency and the product quality of the glass window capable of being electrically heated.

Description of the drawings:

FIG. 1 is a schematic view of an electrically heatable glazing according to the present invention;

FIG. 2 is a partially enlarged schematic view of a dark shielding layer according to a second embodiment of the present invention;

FIG. 3 is a partially enlarged schematic view of a dark shielding layer according to a third embodiment of the present invention;

FIG. 4 is a schematic enlarged partial view of a dark shield layer according to a fourth embodiment of the present invention;

fig. 5 is a partially enlarged schematic view of a dark shielding layer according to a fifth embodiment of the present invention.

The specific implementation mode is as follows:

The invention will be further explained with reference to the accompanying drawings.

As shown in fig. 1, the electrically heatable glass window of the present invention includes an outer glass plate 1, a thermoplastic interlayer 2 and an inner glass plate 3, wherein the thermoplastic interlayer 2 is sandwiched between the outer glass plate 1 and the inner glass plate 3, a transparent conductive film 4 is deposited on the surface of the outer glass plate 1 contacting with the thermoplastic interlayer 2, and at least two conductive electrodes 5 electrically connected with the transparent conductive film 4; the transparent conductive film 4 is electrically connected to a power supply (not shown) through at least two conductive electrodes 5, so that a current of the power supply can be supplied into the transparent conductive film 4.

In the present invention, the glazing may be installed in a body opening position of a vehicle, with its outer glass pane 1 located outside the vehicle and its inner glass pane 3 located inside the vehicle; the surface of the outer glass sheet 1 remote from the thermoplastic interlayer 2 is defined as the first surface 11, the surface of the outer glass sheet 1 in contact with the thermoplastic interlayer 2 is positioned as the second surface 12, the surface of the inner glass sheet 3 in contact with the thermoplastic interlayer 2 is defined as the third surface 13, and the surface of the inner glass sheet 3 remote from the thermoplastic interlayer 2 is defined as the fourth surface 14. The invention deposits the transparent conductive film 4 on the second surface 12, can realize the fourth surface printing in a low-cost mode, and can meet the requirement of the profile quality of the integrated multifunctional automobile glass, such as clearer head-up display (HUD) effect.

the invention preferably arranges a dark shielding layer 6 below at least one conductive electrode 5, the dark shielding layer 6 is arranged on the surface of the outer glass plate 1 contacted with the thermoplastic interlayer 2, namely the second surface 12, the transparent conductive film 4 is deposited on at least partial surface of the dark shielding layer 6, and the dark shielding layer 6 is used for shielding components in the glass window, such as the boundary of the transparent conductive film 4, the conductive electrode 5, a lead connector (not shown) and the like; the thickness of the dark color shielding layer 6 is micron-sized, for example, 5 to 40 microns, the thickness of the transparent conductive film 4 is nanometer-sized, for example, 50 to 500 nanometers, in order to avoid the step fault generated at the junction of the dark color shielding layer 6 and the second surface 12 by the transparent conductive film on the second surface 12 and the transparent conductive film on the dark color shielding layer 6, preferably, at least part of the surface of the dark color shielding layer 6 on which the transparent conductive film 4 is deposited is a thickness gradient section, and the thickness of the thickness gradient section is gradually increased from one end close to the center of the outer glass plate 1 to one end far away from the center of the outer glass plate 1; through the thickness gradual change section, the continuous transition of the transparent conductive film 4 from the second surface 12 to the surface of the dark color shielding layer 6 can be realized, the phenomenon of 'fracture' of the local part of the transparent conductive film 4 is eliminated, the conductive continuity and the electric heating effect of the transparent conductive film 4 are improved, and meanwhile, the production efficiency and the product quality of the glass window capable of being electrically heated can also be improved.

in order to enable the transparent conductive film 4 to be deposited continuously from the second surface 12 to the surface of the thickness gradient of the dark shielding layer 6, the width of the thickness gradient of the dark shielding layer 6 is preferably 1.5 to 1000 times, more preferably 3 to 300 times, of the maximum thickness of the thickness gradient, for example, the width of the thickness gradient is 3 mm, the maximum thickness of the thickness gradient is 20 micrometers, and the former is 150 times of the latter. In particular, the width of the thickness transition refers to the distance the thickness transition extends on the second surface 12 from the end close to the center of the outer glass pane 1 to the end remote from the center of the outer glass pane 1.

The transparent conductive film 4 can be formed by depositing the transparent conductive film 4 on the second surface 12 by vapor deposition, for example, by magnetron sputtering; further, the transparent conductive film 4 is preferably able to withstand a high-temperature heat treatment, for example, a heat treatment process of a bending process such as baking bending or tempering. Specifically, the transparent conductive film 4 may be a metal plating film, a metal alloy plating film, or a transparent conductive oxide plating film; the metal coating may be gold (Au), silver (Ag), copper (Cu), aluminum (Al), or the like, for example, a silver-based coating is adopted, that is, the metal coating includes at least one silver layer, for example, a silver layer (single silver), two silver layers (double silver), three silver layers (triple silver), or the like; the metal alloy coating film can be made of silver alloy; the transparent conductive oxide coating film can be selected from indium tin oxide, fluorine-doped tin dioxide, aluminum-doped tin dioxide, gallium-doped tin dioxide, boron-doped tin dioxide, tin zinc oxide, antimony-doped tin oxide and the like.

The conductive electrode 5 may be a metal foil fixed on the transparent conductive film 4 by means of pasting or the like, the metal foil may be a gold foil, a silver foil, a copper foil, an aluminum foil or the like, and a copper foil with a tin-plated surface is usually used as the conductive electrode 5; the conductive electrode 5 can also be conductive silver paste, and the conductive silver paste is directly formed on the transparent conductive film 4 by printing and other modes to form the conductive electrode 5; the conductive electrode 5 can also select conductive silver paste and metal foil at the same time, the conductive silver paste is directly printed on the transparent conductive film 4, and then the metal foil is fixed on the conductive silver paste by means of pasting and the like. The conductive electrode 5 comprising a conductive silver paste has a silver content of at least 90%, more preferably at least 95%, most preferably at least 99%.

The dark color shielding layer 6 is preferably made of dark color ink, such as black ceramic glaze, and can be fixed on the second surface 12 through screen printing and the like, so that the boundary of the transparent conductive film 4, the conductive electrode 5, the transition conductive layer 7, the lead connector and the like are prevented from being seen from the outside of the vehicle, the peripheral color of the glass window can be ensured to be consistent, and the peripheral appearance of the glass window is improved; but also can obstruct solar radiation, avoid the accelerated aging of components in the glass window, improve the stability of the product and prolong the service life. Alternatively, the dark masking layer 6 may also be brown or the like. Specifically, the dark color shielding layer 6 may be formed on the second surface 12 of the outer glass plate 1 by screen printing or ink-jet printing of a black ceramic glaze, the surface of the thickness gradient section of the dark color shielding layer 6 may be realized by screen printing of a mesh-variable screen or ink-jet printing software setting, the dark color shielding layer 6 may be pre-cured by high-temperature sintering at 400 ℃ or more or baking at 100 to 150 ℃, and then the transparent nano film 4 is deposited on the second surface 12 of the outer glass plate 1 by magnetron sputtering, and the transparent nano film 4 may be continuously deposited on the second surface 12 and at least a partial surface of the dark color shielding layer 6.

as shown in fig. 2 and 5, the dark shielding layer 6 has a thickness transition section 61 and a thickness equalizing section 62, the thickness of the thickness transition section 61 gradually increases from one end close to the center of the outer glass plate 1 to one end far away from the center of the outer glass plate 1, the thickness of the thickness equalizing section 62 is equal to the maximum thickness of the thickness transition section 61, and the thickness equalizing section 62 extends outwards to the same side outer edge 15 of the outer glass plate 1; the thickness gradient section 61 is wedge-shaped, one end of the thickness gradient section 61 close to the center of the outer glass plate 1 is the rightmost end 63 of the thickness gradient section 61, and the transparent conductive film 4 is continuously deposited from the second surface 12 to the outside to the surface of the thickness gradient section 61 and then to at least a partial surface of the uniform thickness section 62. In fig. 1, the dark masking layer 6 also has a thickness gradient and a mean thickness similar to the embodiments shown in fig. 2 and 5.

In fig. 2, the conductive electrode 5 is disposed on the surface of the transparent nanomembrane 4 on the blanket section 62, and the conductive electrode 5 is in direct electrical contact with the transparent nanomembrane 4. In fig. 5, the conductive electrode 5 is directly disposed on the blanket section 62, the transparent nanomembrane 4 is continuously deposited from the surface of the blanket section 62 to at least a partial surface of the conductive electrode 5, and the conductive electrode 5 is in direct electrical contact with the transparent nanomembrane 4; due to the good conductivity of the conductive electrode 5, the conductive continuity of the transparent nano film 4 can be ensured at the junction of the conductive electrode 5 and the uniform thickness section 62, and the phenomenon of temperature abnormity or local heating failure at the junction can not be generated.

As shown in fig. 3, the whole dark color shielding layer 6 is a thickness gradient section, the thickness of the dark color shielding layer 6 gradually increases from one end close to the center of the outer glass plate 1 to one end far away from the center of the outer glass plate 1, and the dark color shielding layer 6 extends outwards to the outer edge 15 on the same side of the outer glass plate 1; the thickness gradient section 601 is wedge-shaped, the transparent conductive film 4 is continuously deposited from the second surface 12 to the outside to at least partial surface of the thickness gradient section 601, the conductive electrode 5 is arranged on the surface of the transparent nano film 4 on the thickness gradient section 601, and the conductive electrode 5 is in direct electrical contact with the transparent nano film 4.

As shown in fig. 4, the dark shielding layer 6 has a first thickness gradient section 611, a mean thickness section 612 and a second thickness gradient section 613, the thickness of the first thickness gradient section 611 gradually increases from the end close to the center of the outer glass plate 1 to the end far from the center of the outer glass plate 1, the thickness of the mean thickness section 612 is equal to the maximum thickness of the first thickness gradient section 611, the thickness of the second thickness gradient section 613 gradually decreases from the end close to the center of the outer glass plate 1 to the end far from the center of the outer glass plate 1, and the second thickness gradient section 613 extends outwards to the same side outer edge 15 of the outer glass plate 1; the first thickness gradient section 611 and the second thickness gradient section 613 are wedge-shaped, the transparent conductive film 4 is continuously deposited from the second surface 12 to the outside to the surface of the first thickness gradient section 611 and then to at least a partial surface of the uniform thickness section 612, the conductive electrode 5 is arranged on the surface of the transparent nanomembrane 4 on the uniform thickness section 612, and the conductive electrode 5 is in direct electrical contact with the transparent nanomembrane 4.

In fig. 2, 3, 4 and 5, the rightmost end 63 of the thickness gradient sections 61, 601 and the first thickness gradient section 611 schematically has a thickness that does not cause step faults in the transparent conductive film 4, so as not to affect the continuous deposition of the transparent conductive film 4; it is understood that the thickness of the thickness transitions 61, 601 and the rightmost end 63 of the first thickness transition 611 may actually be close to zero.

Meanwhile, for clarity of marking and display, the dark shielding layer 6 in fig. 2, 3, 4 and 5 is not filled with patterns as in fig. 1. In addition, the thicknesses of the transparent nano film 4 on the second surface 12 and the transparent conductive film 4 on the surface of the dark shielding layer 6 are equal, the thicknesses of the transparent nano film 4 on the surface of the conductive electrode 5 in fig. 5 are also equal to the thicknesses of the transparent nano film 4, and the partial unequal thicknesses in the drawing are caused for convenience of drawing and visual display and do not affect the actual product. Optionally, the surface of the thickness gradient section may be a plane or a curved surface; for example, the surfaces of the thickness transitions 61, 601 in fig. 2, 3 and 5 are flat surfaces, the surface of the first thickness transition 611 in fig. 4 is a convex curved surface, and the surface of the thickness transition may be a concave curved surface.

In fig. 1 and 4, the present invention is provided with a second dark shielding layer 7 on the fourth surface 14; in fig. 2, 3 and 5, the present invention is provided with a second dark shielding layer 7 on the third surface 13; of course, the second dark shielding layer 7 may be provided on the third surface 13 and the fourth surface 14 at the same time; the boundaries of the transparent conductive film 4, the conductive electrodes 5, the transitional conductive layer 7, the lead connectors, and the like can be prevented from being seen from the inside of the vehicle by the second dark-colored shielding layer 7; preferably, the distance between one end of the second dark shielding layer 7 close to the center of the inner glass plate 3 and the center of the inner glass plate 3 is greater than or equal to the distance between one end of the dark shielding layer 6 close to the center of the outer glass plate 1 and the center of the outer glass plate 1, so that the second dark shielding layer 7 can shield the thickness transition sections 61 and 601 of the dark shielding layer 6 and the rightmost end 63 of the first thickness transition section 611, and the possibility of partial light transmission is effectively eliminated. The material of the second dark masking layer 7 may be chosen in conformity with the dark masking layer 6, and may be fixed to the third surface 13 and/or the fourth surface 14 by means of screen printing or ink-jet printing, using dark inks, such as black ceramic frit.

In fig. 2, 3, 4 and 5, the invention further provides a dot-shaped ink region 8 on the third surface 13 and/or the fourth surface 14, the dot-shaped ink region 8 includes a plurality of ink dots formed by dark-colored ink and spaced from each other, and the dot-shaped ink region 8 extends from one end of the second dark-colored shielding layer 7 close to the center of the inner glass plate 3, so that the dot-shaped ink region 8 does not need to be provided on the second surface 12, and while the product appearance of the glass window is further improved, the direct contact between the dot-shaped ink region 8 and the transparent conductive film 4 is avoided, thereby eliminating the problem of abnormal change of the film sheet resistance of the dot-shaped ink region 8. The dot-shaped ink areas 8 may also be formed by screen printing or ink-jet printing a dark ink on the third surface 13 and/or the fourth surface 14 to form a plurality of ink dots spaced apart from each other.

The dark ink disclosed by the invention is printed on the surface of the outer glass plate 1 and/or the inner glass plate 3 by screen printing or ink jet printing, and the like, preferably, the ink particle size of the dark ink is 0.1-10 μm, which is beneficial to smooth printing of the dark ink, more preferably, the ink particle size is less than 5 μm, and most preferably, the ink particle size is less than 1 μm.

The invention discovers that the sheet resistance of the transparent conductive film 4 on at least partial surface of the dark shielding layer 6 is larger than that of the transparent conductive film 4 on the second surface 12, the surface roughness of the dark shielding layer 6 is different, the degree of the larger sheet resistance is different, the surface roughness Ra of the dark shielding layer 6 is preferably 0.1-4.0 μm, and the conductive continuity and the electric heating effect of the transparent conductive film 4 can be ensured; the invention uses double silver coating as transparent conductive film 4 to illustrate the surface roughness of dark shielding layer 6 and the sheet resistance change of transparent conductive film 4, and the specific results are shown in table 1:

Table 1: surface roughness and sheet resistance change results

With reference to table 1, the surface roughness Ra of the dark color shielding layer 6 is more preferably 0.3 to 1.2 μm, and a good heating effect and a simple processing process can be considered; in view of the need for locally enhanced heating of a portion of the glass product, it is preferred that the sheet resistance of the transparent conductive film 4 on at least a partial surface of the dark shielding layer 6 is 1.8 to 3.2 times the sheet resistance of the transparent conductive film 4 on the second surface 12, and in particular that the surface roughness Ra of the dark shielding layer 6 is 0.6 to 1.0 μm, which enables a more rational distribution of the heating power density area on the glazing.

The electrically heatable glass window according to the present invention has been described in detail, but the present invention is not limited to the above-described embodiments, and therefore, any improvements, equivalent modifications, substitutions and the like made in accordance with the technical gist of the present invention are within the scope of the present invention.