CN109475018B - Front windshield with transparent conductive film - Google Patents

Front windshield with transparent conductive film Download PDF

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Publication number
CN109475018B
CN109475018B CN201811234436.1A CN201811234436A CN109475018B CN 109475018 B CN109475018 B CN 109475018B CN 201811234436 A CN201811234436 A CN 201811234436A CN 109475018 B CN109475018 B CN 109475018B
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China
Prior art keywords
conductive
film
discontinuous
transparent conductive
front windshield
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CN201811234436.1A
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CN109475018A (en
Inventor
曹晖
陈国富
郭昌炜
曾东
姚俊
福原康太
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Fuyao Glass Industry Group Co Ltd
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Fuyao Glass Industry Group Co Ltd
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Priority to CN201811234436.1A priority Critical patent/CN109475018B/en
Publication of CN109475018A publication Critical patent/CN109475018A/en
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    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05BELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00Ohmic-resistance heating
    • H05B3/84Heating arrangements specially adapted for transparent or reflecting areas, e.g. for demisting or de-icing windows, mirrors or vehicle windshields
    • H05B3/86Heating arrangements specially adapted for transparent or reflecting areas, e.g. for demisting or de-icing windows, mirrors or vehicle windshields the heating conductors being embedded in the transparent or reflecting material
    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05BELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B2203/00Aspects relating to Ohmic resistive heating covered by group H05B3/00
    • H05B2203/009Heaters using conductive material in contact with opposing surfaces of the resistive element or resistive layer
    • H05B2203/01Heaters comprising a particular structure with multiple layers

Abstract

The invention relates to the technical field of glass, in particular to electrically heatable automobile glass, and particularly provides a front windshield with a transparent conductive film, which comprises a first bent glass plate, a second bent glass plate, a thermoplastic interlayer and the transparent conductive film, wherein at least one film-free area is arranged in the transparent conductive film, at least two circles of discontinuous conductive bands are arranged around the at least one film-free area, each circle of discontinuous conductive bands comprises at least two conductive sections with gaps between the conductive sections, each conductive section of each circle of discontinuous conductive band corresponds to at least one gap of an adjacent circle of discontinuous conductive band, and each end of each conductive section is respectively positioned between two ends of the nearest conductive section in the adjacent circle of discontinuous conductive band. The invention can make the current flow along at least two circles of discontinuous conductive bands and the transparent conductive film between the discontinuous conductive bands, thereby avoiding local current convergence, correspondingly improving local resistance, further eliminating local hot spots and cold spots and achieving the effect of uniform heating.

Description

Front windshield with transparent conductive film
Technical Field
The invention relates to the technical field of glass, in particular to electrically-heatable automobile glass, and particularly provides a front windshield with a transparent conductive film.
Background
In cold weather, the automobile glass and the architectural glass are easy to frost; or when the humidity in the automobile and the indoor is high and the temperature and the external environment are greatly different, the automobile glass and the building glass are easy to fog; therefore, the view lines and the appearances of the inside and the inside of the automobile are influenced, particularly, the front windshield of the automobile which provides a good view field for a driver is greatly influenced if frosting and fogging phenomena occur on the front windshield, safety accidents are easily caused, and the front windshield of the automobile is required to have the functions of defrosting and demisting. With the development of technology, it is known that an electric current is passed through an electric heating element, such as a silver paste printed heating wire, a metal wire, or a transparent conductive film, disposed on the surface of or inside the automobile glass, so as to heat the automobile windshield by generating heat through the electric heating element, thereby achieving the functions of defrosting and defogging.
In conventional electrically heated glazing designs, a single transparent conductive film is disposed over a substantial portion of the surface of the glass substrate, as disclosed in, for example, patents US6472636(B1) and EP2591637(B1), but the transparent conductive film may be strongly shielded from electromagnetic radiation signals, which may affect wireless data transmission within the vehicle. In order to allow communication signals to pass smoothly through the glazing, it is common to provide at least one film-free region in a transparent conductive film, for example patent CN104919892B discloses a glass pane with an electrical heating layer comprising at least one electrical heating layer consisting of an electrically conductive coating, said electrical heating layer extending over the entire surface of at least one glass pane, an uncoated region being provided at the centre of the glass pane, the uncoated region having no conductive material of the electrical heating layer; another example patent CN105379413A discloses a heating element having a communication window, including a substrate and a first bus bar, a second bus bar, and a heating pattern provided on the substrate, the heating pattern including a first pattern region in contact with the first bus bar and a second pattern region in contact with both the second bus bar and the first pattern region, an open region serving as a communication window being provided in the first pattern region; CN106465479A also discloses a transparent glass plate with a heating coating, comprising an outer glass plate, an inner glass plate and a thermoplastic adhesive layer, wherein a transparent conductive coating is deposited on the side of the inner glass plate bonded to the thermoplastic adhesive layer, and at least one uncoated area is formed in the conductive coating by means of pre-masking, etching or friction stripping; if only the uncoated area, the open area or the uncoated area, etc. having no conductive material are directly provided, the current density distribution of the heating current flowing in at least a partial area of the conductive film layer is adversely affected, thereby causing uneven heating power distribution, for example, the heating power under and around the area having no conductive film layer is significantly reduced, while the heating power at other local positions is drastically increased, which causes extreme unevenness of the heating temperature distribution and finally tends to generate local hot and cold spots, which is disadvantageous for the front windshield itself and the accessories mounted on the surface thereof.
Disclosure of Invention
The invention aims to solve the technical problem of providing a front windshield with a transparent conductive film aiming at the defects of uneven heating power distribution, easy generation of local hot spots and cold spots and the like in the prior art.
The technical scheme adopted by the invention for solving the technical problems is as follows: a front windshield having a transparent conductive film comprising a first curved glass sheet, a second curved glass sheet, a thermoplastic interlayer and a transparent conductive film, the thermoplastic interlayer being sandwiched between the first curved glass sheet and the second curved glass sheet, the transparent conductive film being deposited on a first surface of the first curved glass sheet in contact with the thermoplastic interlayer or a second surface of the second curved glass sheet in contact with the thermoplastic interlayer, at least one film-free region being provided in the transparent conductive film, characterized in that: at least two circles of discontinuous conductive strips are arranged around at least one film-free area and are in direct electrical contact with the transparent conductive film, each circle of discontinuous conductive strips comprises at least two conductive sections with gaps between each two conductive sections, each conductive section of each circle of discontinuous conductive strips corresponds to at least one gap of the adjacent circle of discontinuous conductive strips, and each end of each conductive section is respectively positioned between two ends of the nearest conductive section in the adjacent circle of discontinuous conductive strips.
Further, the front windshield further comprises a first bus bar and a second bus bar electrically connected to the transparent conductive film, respectively, and the first bus bar and the second bus bar are located between the first curved glass plate and the second curved glass plate.
Further, the transparent conductive film comprises a metal layer, a metal alloy layer or a metal oxide layer, wherein the metal layer is made of gold, silver, copper, aluminum or molybdenum, the metal alloy layer is made of silver alloy, and the metal oxide layer is made of indium tin oxide, fluorine-doped tin dioxide, aluminum-doped tin dioxide, gallium-doped tin dioxide, boron-doped tin dioxide, tin zinc oxide or antimony-doped tin oxide.
Furthermore, at least four superposed heating zones are formed between two adjacent circles of the discontinuous conductive strips, one side of the transparent conductive film in each superposed heating zone is at least partially superposed with the conductive section of one circle of the discontinuous conductive strips, and the other opposite side of the transparent conductive film is at least partially superposed with the conductive section of the other circle of the discontinuous conductive strips.
Furthermore, the ratio of the total resistance of the at least two circles of intermittent conductive strips and the transparent conductive films in the at least four overlapped heating areas to the equivalent resistance of the transparent conductive films removed from the film-free areas is 0.5-1.5, preferably 0.8-1.2, and more preferably, the total resistance of the at least two circles of intermittent conductive strips and the transparent conductive films in the at least four overlapped heating areas is equal to the equivalent resistance of the transparent conductive films removed from the film-free areas.
Further, each conductive segment of each circle of the discontinuous conductive strips corresponds to each gap of the adjacent circle of the discontinuous conductive strips one to one.
Further, the length of each conductive segment of each circle of the intermittent conductive strips is larger than the distance between two adjacent circles of the intermittent conductive strips.
Further, the sheet resistance of the conductive segments is smaller than that of the transparent conductive film.
Furthermore, the width of the conductive segment is 0.1-5.0 mm, and the thickness is 3-500 μm.
Further, each turn of discontinuous conductive tape encloses a shape that is the same as or similar to the shape of the film-free region.
Due to the adoption of the technical scheme, the invention has the following beneficial effects:
according to the front windshield with the transparent conductive film, the current around the film-free area is guided by the at least two circles of the intermittent conductive belts, so that the current flows along the at least two circles of the intermittent conductive belts and the transparent conductive film between the at least two circles of the intermittent conductive belts, the local current convergence is avoided, the local resistance is correspondingly improved, the local hot spots and cold spots are eliminated, and the effect of uniform heating is achieved.
Description of the drawings:
fig. 1 is a schematic top view of a front windshield having a transparent conductive film according to the present invention;
FIG. 2 is a schematic partial cross-sectional view of FIG. 1;
FIG. 3 is an enlarged partial schematic view of FIG. 1;
FIG. 4 is an enlarged partial schematic view of a rectangular shape of the film-free region of the present invention;
FIG. 5 is an enlarged partial view of a trapezoidal shape of the film-free region 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, 2 and 3, a front windshield having a transparent conductive film according to the present invention comprises a first curved glass plate 1, a second curved glass plate 2, a thermoplastic interlayer 3 and a transparent conductive film 4, wherein the thermoplastic interlayer 3 is sandwiched between the first curved glass plate 1 and the second curved glass plate 2, the transparent conductive film 4 is deposited on a first surface 11 of the first curved glass plate 1 contacting the thermoplastic interlayer 3 or a second surface 21 of the second curved glass plate 2 contacting the thermoplastic interlayer 3, and at least one film-free region 5 is provided in the transparent conductive film 4, and is characterized in that: at least two circles of intermittent conductive strips 6 are arranged around at least one film-free area 5, the intermittent conductive strips 6 are in direct electrical contact with the transparent conductive film 4, each circle of intermittent conductive strips 6 comprises at least two conductive sections 61 with gaps 62 between each other, each conductive section 61 of each circle of intermittent conductive strips 6 corresponds to at least one gap 62 of each adjacent circle of intermittent conductive strips, and each end of each conductive section 61 is respectively positioned between two ends of the nearest conductive section in each adjacent circle of intermittent conductive strips 6. Therefore, the current around the film-free area 5 is guided by the at least two circles of the intermittent conductive strips 6, so that the current flows along the at least two circles of the intermittent conductive strips 6 and the transparent conductive film between the at least two circles of the intermittent conductive strips 6, the local current convergence is avoided, the local resistance is correspondingly improved, the local hot spots and cold spots are eliminated, and the effect of uniform heating is achieved.
In general, one, two, or even more film-free regions 5 may be disposed in the transparent conductive film 4, when two or more film-free regions 5 are disposed, at least two circles of the discontinuous conductive tapes 6 may be disposed around one of the film-free regions 5, at least two circles of the discontinuous conductive tapes 6 may be disposed around the plurality of film-free regions 5, or even at least two circles of the discontinuous conductive tapes 6 may be disposed around the plurality of film-free regions 5 in common, that is, at least two circles of the discontinuous conductive tapes 6 surround the plurality of film-free regions 5. In addition, since the front windshield may be provided with a rain sensor and/or a camera, the film-free area 5 of at least two circles of the discontinuous conductive strips 6 is preferably arranged in the rain sensor and/or camera installation area; of course, it is also possible to provide at least two turns of the discontinuous conductive strip 6 in the film-free zone 5, which serves as a communication window for ETC, RFID or the like.
In fig. 1, the front windshield having a transparent conductive film according to the present invention further includes a first bus bar 7 and a second bus bar 8 electrically connected to the transparent conductive film 4, respectively, the first bus bar 7 and the second bus bar 8 are located between the first curved glass plate 1 and the second curved glass plate 2, a power supply (not shown) can make a heating current flow through the transparent conductive film 4 through the first bus bar 7 and the second bus bar 8, and the transparent conductive film 4 generates heat and generates heat under the action of the heating current, so that the front windshield has a defrosting and defogging function.
In the present invention, the transparent conductive film 4 may be deposited directly on the first surface 11 or the second surface 21 by a Chemical Vapor Deposition (CVD) or Physical Vapor Deposition (PVD), 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 include a metal layer, a metal alloy layer, or a metal oxide layer, where the metal layer may be gold (Au), silver (Ag), copper (Cu), aluminum (Al), or molybdenum (Mo), the metal alloy layer may be a silver alloy, and the metal oxide layer may be 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, or the like; for example, when the transparent conductive film 4 includes a silver layer or a silver alloy layer, the silver layer or the silver alloy layer is located between at least two dielectric layers containing at least one of zinc oxide, tin oxide, indium oxide, titanium oxide, silicon oxide, aluminum oxide, silicon nitride, silicon carbide, aluminum nitride, or a titanium metal layer.
The film-free area 5 can be used as a transmission window of wireless data, and communication data, image data, sensor data and the like can pass through the front windshield without obstacles; the film-free region 5 is located in the transparent conductive film 4, and the peripheral boundary thereof is defined by the transparent conductive film 4; preferably, the transparent conductive film in the film-free region 5 is completely removed, but only a part of the transparent conductive film in the film-free region 5 may be removed, which may be achieved by masking or chemical etching in advance, laser film removal, mechanical rubbing film removal, and the like.
The thermoplastic interlayer 3 of the present invention is used to bond and fix the first curved glass plate 1 and the second curved glass plate 2 together, and for example, Polycarbonate (PC), polyvinyl chloride (PVC), polyvinyl butyral (PVB), Ethylene Vinyl Acetate (EVA), Polyacrylate (PA), polymethyl methacrylate (PMMA), Polyurethane (PUR), or the like can be selected. Of course, the thermoplastic intermediate layer 3 may also have other functions such as providing at least one colored region as a shadow band to reduce interference of sunlight with human eyes or adding an infrared ray absorber to have a sun-screening or heat-shielding function, and the thermoplastic intermediate layer 3 may further include at least two layers, one of which has a higher plasticizer content to have a sound-insulating function, or one of which has a wedge shape to have a head-up display (HUD) function, etc.
In fig. 3, the current supplied by the power supply (not shown) to the transparent conductive film 4 flows in two circles of the discontinuous conductive strips 6 and the transparent conductive film therebetween along the current direction 100 around the film-free area 5, at least four overlapped heating areas 101 are formed between two adjacent circles of the discontinuous conductive strips 6, one side of the transparent conductive film in each overlapped heating area 101 at least partially overlaps with the conductive section 61 of one of the circles of the discontinuous conductive strips 6, and the other opposite side at least partially overlaps with the conductive section 61 of the other circle of the discontinuous conductive strips 6, so that at least two circles of the discontinuous conductive strips 6 and at least four overlapped heating areas 101 together form a current path in the current direction 100, and thus a uniform heating area is formed around the film-free area 5. According to the invention, each conductive section 61 of each circle of the intermittent conductive strips 6 is preferably in one-to-one correspondence with each gap 62 of one adjacent circle of the intermittent conductive strips, namely the number of the conductive sections 61 arranged in two adjacent circles of the intermittent conductive strips 6 is equal, so that the conductive sections can be more uniformly arranged, and a more uniform heating effect is further realized. At the same time, it is also preferred that the length of each conductive segment 61 of each turn of the intermittent conductive strip 6 is greater than the distance between two adjacent turns of the intermittent conductive strip 6, thereby ensuring that the current flows sequentially in the current flow direction 100 in at least two turns of the intermittent conductive strip 6 and at least four overlapping heating zones.
In order to improve the local resistance around the film-free region 5, the ratio of the total resistance of the transparent conductive films in the at least two circles of intermittent conductive strips 6 and the at least four overlapped heating regions 101 to the equivalent resistance of the transparent conductive film removed from the film-free region 5 is preferably 0.5 to 1.5, and more preferably 0.8 to 1.2, and the total resistance of the transparent conductive films in the at least two circles of intermittent conductive strips 6 and the at least four overlapped heating regions 101 is more preferably equal to the equivalent resistance of the transparent conductive film removed from the film-free region 5.
Specifically, the sheet resistance of the conductive segment 61 is smaller than that of the transparent conductive film 4, and preferably, the sheet resistance of the conductive segment 61 is 0.005-0.5 Ω/□; more specifically, the conductive segments 61 can be directly printed on the transparent conductive film 4 by screen printing or the like, the material of the conductive segments can be conductive silver paste or the like, and the width of the conductive segments 61 is 0.1-5.0 mm and the thickness thereof is 3-500 μm.
In the present invention, it is also preferable that the shape enclosed by each turn of the discontinuous conductive tape 6 is the same as or similar to the shape of the film-free region 5, for example, fig. 3 shows that the film-free region 5 is in a circular shape, the shape enclosed by each turn of the discontinuous conductive tape 6 is also in a circular shape, fig. 4 shows that the film-free region 5 is in a rectangular shape, the shape enclosed by each turn of the discontinuous conductive tape 6 is also in a rectangular shape, fig. 5 shows that the film-free region 5 is in a trapezoidal shape, and the shape enclosed by each turn of the discontinuous conductive tape 6 is also in a trapezoidal shape. Meanwhile, in fig. 3 and 5, the present invention provides two circles of the intermittent conductive strips 6, each circle of the intermittent conductive strips 6 including six conductive segments 61; in fig. 4, the present invention provides two turns of discontinuous conductive strip 6, each turn of discontinuous conductive strip 6 comprising eight conductive segments 61; it should be understood, however, that the invention is not limited thereto, and in practical application, three, four or more turns of the intermittent conductive strip 6 may be provided, and each turn of the intermittent conductive strip 6 may also include two, three, four, five, seven or more conductive segments 61.
The foregoing describes a front windshield having a transparent conductive film according to the present invention, 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.

Claims (10)

1. A front windshield having a transparent conductive film comprising a first curved glass sheet, a second curved glass sheet, a thermoplastic interlayer and a transparent conductive film, the thermoplastic interlayer being sandwiched between the first curved glass sheet and the second curved glass sheet, the transparent conductive film being deposited on a first surface of the first curved glass sheet in contact with the thermoplastic interlayer or a second surface of the second curved glass sheet in contact with the thermoplastic interlayer, at least one film-free region being provided in the transparent conductive film, characterized in that: at least two circles of discontinuous conductive strips are arranged around at least one film-free area and are in direct electrical contact with the transparent conductive film, each circle of discontinuous conductive strips comprises at least two conductive sections with gaps between each two conductive sections, each conductive section of each circle of discontinuous conductive strips corresponds to at least one gap of the adjacent circle of discontinuous conductive strips, and each end of each conductive section is respectively positioned between two ends of the nearest conductive section in the adjacent circle of discontinuous conductive strips.
2. The front windshield according to claim 1, wherein: the front windshield further comprises a first bus and a second bus which are electrically connected with the transparent conductive film respectively, and the first bus and the second bus are located between the first bent glass plate and the second bent glass plate.
3. The front windshield according to claim 1, wherein: the transparent conductive film comprises a metal layer, a metal alloy layer or a metal oxide layer, wherein the metal layer is made of gold, silver, copper, aluminum or molybdenum, the metal alloy layer is made of silver alloy, and the metal oxide layer is made of indium tin oxide, fluorine-doped tin dioxide, aluminum-doped tin dioxide, gallium-doped tin dioxide, boron-doped tin dioxide, tin zinc oxide or antimony-doped tin oxide.
4. The front windshield according to claim 1, wherein: at least four superposed heating areas are formed between two adjacent circles of the discontinuous conductive strips, one side of the transparent conductive film in each superposed heating area is at least partially superposed with the conductive section of one circle of the discontinuous conductive strips, and the other opposite side of the transparent conductive film is at least partially superposed with the conductive section of the other circle of the discontinuous conductive strips.
5. The front windshield according to claim 4, wherein: the ratio of the total resistance of the at least two circles of discontinuous conductive strips and the transparent conductive films in the at least four superposed heating areas to the equivalent resistance of the transparent conductive films removed from the film-free areas is 0.5-1.5.
6. The front windshield according to claim 1, wherein: each conductive segment of each circle of the discontinuous conductive strips corresponds to each gap of the adjacent circle of the discontinuous conductive strips one to one.
7. The front windshield according to claim 1, wherein: the length of each conductive segment of each circle of the intermittent conductive strips is larger than the distance between two adjacent circles of the intermittent conductive strips.
8. The front windshield according to claim 1, wherein: the sheet resistance of the conductive segments is less than that of the transparent conductive film.
9. The front windshield according to claim 1, wherein: the width of the conductive section is 0.1-5.0 mm, and the thickness is 3-500 μm.
10. The front windshield according to claim 1, wherein: each turn of discontinuous conductive tape encloses a shape that is the same as or similar to the shape of the film-free region.
CN201811234436.1A 2018-10-23 2018-10-23 Front windshield with transparent conductive film Active CN109475018B (en)

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CN109475018B true CN109475018B (en) 2020-02-21

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JPH08253107A (en) * 1995-03-16 1996-10-01 Asahi Glass Co Ltd Current-carrying heating glass
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CN105376883A (en) * 2015-09-17 2016-03-02 福建省万达汽车玻璃工业有限公司 Automobile laminated glass with communication window and function of film-free area uniform electric heating
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JP2017505256A (en) * 2013-12-11 2017-02-16 エージーシー グラス ユーロップAgc Glass Europe Heated windscreen
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CN207972507U (en) * 2018-02-11 2018-10-16 福耀玻璃工业集团股份有限公司 A kind of car coated glass with round communication window

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4947244B1 (en) * 1969-05-23 1974-12-14
JPH08253107A (en) * 1995-03-16 1996-10-01 Asahi Glass Co Ltd Current-carrying heating glass
US6559419B1 (en) * 2001-08-03 2003-05-06 Centre Luxembourgeois De Recherches Pour Le Verre Et La Ceramique S.A. (C.R.V.C.) Multi-zone arrangement for heatable vehicle window
CN1672465A (en) * 2002-07-24 2005-09-21 Ppg工业俄亥俄公司 Transparent heating arrangement to avoid hot spots at the end of bus bars
CN101848810A (en) * 2007-11-05 2010-09-29 皮尔金顿汽车德国有限公司 Laminated glazing which includes one or more wires
CN102640562A (en) * 2009-12-11 2012-08-15 法国圣戈班玻璃厂 Coated disk having a heatable communication window
CN102812775A (en) * 2010-09-09 2012-12-05 法国圣戈班玻璃厂 Transparent panel having a heatable coating
JP2017505256A (en) * 2013-12-11 2017-02-16 エージーシー グラス ユーロップAgc Glass Europe Heated windscreen
CN106416425A (en) * 2014-04-17 2017-02-15 法国圣戈班玻璃厂 Transparent panel having a heatable coating
CN105376883A (en) * 2015-09-17 2016-03-02 福建省万达汽车玻璃工业有限公司 Automobile laminated glass with communication window and function of film-free area uniform electric heating
JP2017212148A (en) * 2016-05-26 2017-11-30 日本板硝子株式会社 Windshield
JP2017214059A (en) * 2016-05-27 2017-12-07 日本板硝子株式会社 Windshield
CN207972507U (en) * 2018-02-11 2018-10-16 福耀玻璃工业集团股份有限公司 A kind of car coated glass with round communication window

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