Window pane for electrical heating, method for its manufacture and use thereof

Abstract

The invention relates to an electrically heatable glazing (10) comprising a glass pane (1), an electrically conductive coating (2) arranged on the glass pane (1), a first deletion line (3) forming a heating zone (2') in the electrically conductive coating (2), a second deletion line (4) in contact with the first deletion line (3) and extending in the heating zone (2'), a first and a second busbar (5, 6) at least partially adjacent to the first deletion line (3) on the heating zone (2'), and an intersection (7) of the first and the second busbar (5, 6) at a contact of the first and the second busbar (5, 6) with the first and the second deletion line (3, 4). The invention further relates to a method for manufacturing the glazing and to the use of the glazing, for example as a window of a vehicle.

Description

Technical Field

[0001] The present invention relates to an electrically heated window glass, a method for manufacturing the window glass, and its uses, for example, as a window for a vehicle. Background Technology

[0002] Window glass for electric heating with a conductive coating on a glass substrate is well known. Busbars for supplying current to the conductive coating are typically located near the edges of the window glass. In vehicle side windows, the busbars may run along the bottom edge inside the vehicle door or at the side edge adjacent to the door frame.

[0003] DE102004029164A1 (Baranski / Pilkington) discloses a laminated glass plate with a conductive coating. Two busbars made of metal strips are covered with an insulating layer. Contact windows are provided in the insulating layer for electrical contact with designated sections of the conductive coating.

[0004] US2016174295A1 (Klein / Saint-Gobain) discloses a heatable laminated side panel comprising a conductive coating segmented by insulating lines. First and second busbars are formed as conductive foil strips or fired printing paste.

[0005] DE102013007381A1 (Straube / Volkswagen) discloses a transparent plate having a heatable coating and at least one busbar. The busbar is printed on the coating and includes an insulating layer printed on top of the conductive layer.

[0006] There is still a need for an alternative window glass for electric heating, particularly one with a busbar arranged along at least one edge of the window glass.

[0007] Purpose of the invention

[0008] The object of this invention is to provide a window glaze for electric heating that has a desired heat distribution for improved defrosting or defogging during use. Another object is to provide a simple method for manufacturing window glaze for electric heating. Summary of the Invention

[0009] In a first aspect, the present invention provides a window glass for electric heating.

[0010] The present invention provides a window glass for electric heating, comprising a glass sheet, a conductive coating disposed on the glass sheet, a first strikethrough line forming a heating region in the conductive coating, a second strikethrough line contacting the first strikethrough line and extending in the heating region, a first busbar and a second busbar at least partially adjacent to the first strikethrough line in the heating region, and a crossover of the first busbar and the second busbar at a contact portion between the first strikethrough line and the second strikethrough line.

[0011] The present invention is advantageous because, compared with conventional window glass, window glass having the intersection of the first and second busbars has improved heat distribution.

[0012] Surprisingly, the intersection of the busbars arranged near the first strikethrough line allows current to flow along most of the busbar's length, achieving uniform heating. Conventional window glass has an insulating layer covering most of the busbar's length, so current only flows through the contact window, resulting in hot spots.

[0013] The window glass according to the present invention, which allows current to flow along most of the length of the busbar, has a faster defrosting or defogging speed than conventional window glass.

[0014] This group of heating zones is connected as a parallel circuit between the first and second busbars of adjacent intersections. The parallel circuits can be arranged to provide the desired heat distribution using fewer components than conventional window glass.

[0015] The result of this invention is that the window glass meets industrial testing requirements, such as those for defrosting vehicle windows.

[0016] Preferably, in use, the current flows from the first busbar to the second busbar in the heated coating at least partially around the second strikethrough line.

[0017] Preferably, the conductive coating is a transparent conductive oxide deposited by pyrolysis. More preferably, the coating is fluorine-doped tin oxide deposited during float glass manufacturing at a temperature above 400°C. Advantageously, the pyrolysis-deposited coating is a hard coating compared to a soft coating formed by sputtering. Alternatively, the coating is a sputtered coating having two, three, or four layers of silver.

[0018] Preferably, the first strikethrough line in the conductive coating insulates the heated area of ​​the conductive coating from the non-heated area. The first strikethrough line is advantageous because it avoids the need to remove large areas of the conductive coating. Preferably, the first strikethrough line is multiple strikethrough lines. Preferably, the strikethrough lines in the multiple strikethrough lines are parallel to each other and spaced apart from each other.

[0019] Preferably, the second strikethrough line extends in the non-heated area to the edge of the conductive coating adjacent to the first and second busbars to prevent electrical short circuits between the busbars.

[0020] Preferably, the second strikethrough line includes a strikethrough region at the intersection. The strikethrough region is advantageous because it provides an insulating area, thereby reducing the risk of electrical short circuits.

[0021] Preferably, the first busbar and the second busbar comprise conductive ink. Conductive ink is advantageous because it can be directly printed onto the conductive coating using methods known in the art.

[0022] Preferably, the insulating layer is positioned at the intersection between the first and second busbars. The insulating layer at the intersection saves cost because less insulation material is required compared to conventional window glass with insulation material other than the contact window. In an advantageous embodiment, the insulating layer is a non-conductive ink, preferably printed on the first busbar before the second busbar is printed.

[0023] Preferably, the window glass includes a first partition boundary that contacts the first strikethrough line, and the first partition boundary extends further in the heating region than the second strikethrough line, and the intersection of the first generatrix and the second generatrix is ​​located at the contact portion between the first strikethrough line and the first partition boundary.

[0024] The partition boundary restricts current flow within the partition to control heat distribution in the heated area. In an advantageous embodiment, the partition boundary is a strikethrough line, preferably formed by laser removal of the conductive coating. Preferably, the partition boundary extends from the first strikethrough line to the opposite edge of the conductive coating. Preferably, the partition boundary extends from the first strikethrough line in the non-heated area to the edge of the conductive coating.

[0025] Preferably, the window glass includes a second partition boundary. Advantageously, the first and second partition boundaries provide partitioned regions in which current flows between adjacent portions of the first and second busbars on either side of the intersection. Preferably, in use, the power density in the heated region of the conductive coating between the first and second partition boundaries is between 200 and 1,000 W / m². 2 More preferably, within the range of 300 to 600 W / m 2 Within these ranges, power densities are desirable, for example, for effective defrosting or defogging of vehicle windows.

[0026] In a second aspect, the present invention provides a method for manufacturing window glass.

[0027] The present invention provides a method for manufacturing window glass according to the invention, comprising the steps of: providing a glass plate, distributing a conductive coating on the glass plate, providing a first strikethrough line in the conductive coating, forming a heating region, and distributing a second strikethrough line that contacts the first strikethrough line and extends into the heating region; distributing a first busbar and a second busbar at least partially on the heating region adjacent to the first strikethrough line, and distributing an intersection of the first busbar and the second busbar at a contact portion between the first strikethrough line and the second strikethrough line.

[0028] Preferably, the method for manufacturing window glass further includes a step of pyrolytic deposition of a conductive coating, preferably during the manufacturing of the glass sheet. Preferably, the coating is deposited by chemical vapor deposition (CVD). The step of pyrolytic deposition of the conductive coating during the manufacturing of the glass sheet provides an alternative to sputtering and makes the coating more durable in use.

[0029] Preferably, the method for manufacturing window glass further includes the step of forming the removal lines by laser removal of the heated coating. The laser removal step provides an alternative to mechanical abrasion. Preferably, the first and / or second removal lines are formed by laser removal of the heated coating.

[0030] Preferably, the method for manufacturing window glass further includes the step of printing a first busbar using conductive ink. This printing step provides an alternative to stamping metal foil. Similarly, a second busbar can be applied after the first busbar by printing with conductive ink.

[0031] Preferably, the method for manufacturing window glass further includes a step of printing an insulating layer with non-conductive ink between the steps of printing the first and second busbars with conductive ink. The step of printing the insulating layer with non-conductive ink provides an alternative to arranging adhesive patches.

[0032] In a third aspect, the invention provides window glass according to the invention for use as heated windows in land, sea, and air vehicles, such as windshields, rear windows, side windows, or roof windows of motor vehicles. The invention can also be used as an electric heater in buildings, for example, installed on refrigerator doors or walls or windows in street facilities.

[0033] The invention will now be further disclosed with reference to the non-limiting drawings, non-limiting examples, and comparative examples. Attached Figure Description

[0034] Figure 1 This is an embodiment of the present invention with an intersecting portion.

[0035] Figure 2 yes Figure 1 A cross-section of an embodiment.

[0036] Figure 3This is an embodiment of the present invention with a deletion region.

[0037] Figure 4 yes Figure 3 A cross-section of an embodiment.

[0038] Figure 5 This is an embodiment of the present invention with an insulating layer.

[0039] Figure 6 yes Figure 5 A cross-section of an embodiment.

[0040] Figure 7 This is an embodiment of the present invention with partition boundaries.

[0041] Figure 8 yes Figure 7 A cross-section of an embodiment. Detailed Implementation

[0042] Figure 1 A window glass 10 for electric heating according to the present invention is disclosed, comprising a glass plate 1 and a conductive coating 2 disposed on the main surface of the glass plate 1.

[0043] The glass sheet is preferably soda-lime silicate glass manufactured using the float glass process. The glass thickness is preferably in the range of 2 to 12 mm. The glass sheet can be tempered glass with a surface stress greater than 65 MPa, or heat-strengthened glass with a surface stress in the range of 40 to 55 MPa, or semi-tempered glass with a surface stress in the range of 20 to 25 MPa, or annealed glass.

[0044] The window glass can be a single pane of glass. Compared to laminated glass, single-pane windows are easier to lighten.

[0045] The window glass can be laminated glass, comprising a first glass pane and a second glass pane with an interlayer material, preferably polyvinyl butyral (PVB), between them. Preferably, the laminated glass has a conductive coating and busbars adjacent to the interlayer material. This is advantageous for movable windows in doors because it reduces wear on the seals between the window and the door frame. Laminated glass also improves security.

[0046] The conductive coating 2 may include a transparent conductive oxide, such as tin oxide or fluorine-doped tin oxide, deposited on the glass plate 1 during the glass manufacturing process.

[0047] A first strikethrough line 3 is disposed in the conductive coating 2, thereby forming a heated region 2'. In one embodiment of the invention, the first strikethrough line 3 is the entire extent of the conductive coating 2 adjacent to the edge of the window glass 10. In an advantageous embodiment, the first strikethrough line 3 is a laser-etched line in the conductive coating, isolating the heated and non-heated regions. The non-heated region is adjacent to the edge of the window glass 10. For the side window of a vehicle, the non-heated region and a portion of the heated region 2', including the first busbar 5 and the second busbar 6, are located at the bottom of the window glass 10 and are hidden when viewed from inside the door. The remainder of the heated region 2' is visible when the side window is in the closed position.

[0048] The second strikethrough line 4, which contacts the first strikethrough line 3, extends in the heated region 2'. In the case where a non-heated region of the conductive coating 2 is provided, the second strikethrough line 4 also extends in the non-heated region to the entire extent of the conductive coating 2 adjacent to the edge of the window glass 10.

[0049] The first busbar 5 and the second busbar 6 are arranged to be spaced apart from each other and to be in electrical contact with at least a portion of the heating region 2' to form a heating coating 8.

[0050] In an advantageous embodiment, the heating coating 8 is partially defined at its bottom edge by the inner edges of the first busbar 5 and the second busbar 6. The first busbar 5 and the second busbar 6 can have any shape, such as straight, curved, or multiple sections, each section being straight or curved. The first busbar 5 and the second busbar 6 can comprise any conductive material, such as silver.

[0051] The heating coating 8 can be partially defined, for example, on the left and right sides by the left and right sides of the conductive coating 2.

[0052] The conductive coating material can be removed by laser ablation, mechanical abrasion, or other methods known in the art. The width of the uncoated line is typically in the range of 10 micrometers to 5 millimeters.

[0053] Figure 2 yes Figure 1 A cross-sectional view along line AA of the embodiment. The first busbar 5 extends from the contact portion between the first strikethrough line 3 and the second strikethrough line 4 to the left side of the heating region 2'. The second busbar 6 extends from the contact portion between the first strikethrough line 3 and the second strikethrough line 4 to the right side of the heating region 2'. The intersection 7 of the busbars is indicated as two wedges, but this is not limiting.

[0054] Figure 3 An embodiment of the present invention with a deletion region 4' is disclosed. The width, length, and shape of the deletion region 4' are not limited. The shape of the deletion region 4' is shown as a rectangle, but it can be any shape formed by straight lines or arcs, or a combination of straight lines and arcs.

[0055] Figure 4 yes Figure 3 A cross-sectional view along line AA of an embodiment. Similar to the second strikethrough line 4, the strikethrough region 4' can be formed by laser removal or mechanical abrasion. The strikethrough region 4' can be completely removed as shown, or it can include a pattern of strikethrough lines, such as a grid.

[0056] Figure 5 An embodiment of the present invention having an insulating layer 9 is disclosed. Except that the insulating layer 9 must completely insulate the overlap between the first busbar 5 and the second busbar 6 to avoid short circuits, the width, length, and shape of the insulating layer 9 are not limited.

[0057] Figure 6 yes Figure 5 A cross-sectional view along line AA of the embodiment. The insulating layer 9 is preferably printed with non-conductive ink or is provided as an adhesive patch.

[0058] Figure 7 An embodiment of the present invention is disclosed, which has a first partition boundary 11 and a second partition boundary 12, and two partitioned regions. The first partitioned region is on the left and is a heated coating 8 defined by the left edge of the conductive coating 2 and the first partition boundary 11. The second partitioned region is on the right side of the first partitioned region and is a heated coating 8 defined by the first partition boundary 11 and the second partition boundary 12. The second partitioned region is also defined by the top edge of the conductive coating 2, the first busbar 5 and the second busbar 6, and three deletion regions 4'.

[0059] Figure 8 yes Figure 7 A cross-sectional view along line AA of an embodiment. In this embodiment, each of the four intersections has a deletion region 4' and an insulating layer 9. Advantageously, each intersection has a positional tolerance to accommodate positional variations in the method of applying the first busbar and the second busbar relative to the second deletion line and the first partition boundary and the second partition boundary.

[0060] legend

[0061] The reference numerals in the attached diagram are as follows:

[0062] 1 - First Glass Plate

[0063] 2 - Conductive coating

[0064] 2' - Heating area

[0065] 3 - First strikethrough

[0066] 4 - Second strikethrough

[0067] 4' - Delete region

[0068] 5 - First busbar

[0069] 6 - Second busbar

[0070] 7 - Intersection

[0071] 8 - Heating Coating

[0072] 9 - Insulation layer

[0073] 10 – Window glass

[0074] 11 - First partition boundary

[0075] 12 - Second partition boundary

Claims

1. A window glass (10) for electric heating, comprising: - Glass plate (1); -A conductive coating (2) is arranged on the glass plate (1); - A first strikethrough line (3) is formed in the conductive coating (2) to form a heating region (2'), the first strikethrough line being formed by removing the conductive coating; - A second removal line (4) that contacts the first removal line (3) and extends in the heated area (2') is formed by removing the conductive coating; - The first busbar and the second busbar (5, 6) adjacent to the first strikethrough line (3) are at least partially on the heating region (2'); and - The intersection (7) of the first busbar and the second busbar (5, 6) at the contact point between the first strikethrough line and the second strikethrough line (3, 4).

2. The window glass (10) according to claim 1, wherein, In use, current flows from the first busbar (5) to the second busbar (6) in the heated coating (8) at least partially around the second strikethrough line (4).

3. The window glass (10) according to claim 1 or 2, wherein, The conductive coating (2) is a transparent conductive oxide deposited by pyrolysis.

4. The window glass (10) according to claim 1 or 2, wherein, The first strikethrough line (3) insulates the heated area (2') of the conductive coating (2) from the unheated area.

5. The window glass (10) according to claim 1 or 2, wherein, The second strikethrough (4) includes the strikethrough region (4') at the intersection (7).

6. The window glass (10) according to claim 1 or 2, wherein, The first busbar and the second busbar (5, 6) contain conductive ink.

7. The window glass (10) according to claim 1 or 2 further includes an insulating layer (9) located at the intersection (7) between the first busbar and the second busbar (5, 6).

8. The window glass (10) according to claim 1 or 2 further includes a first partition boundary (11) that contacts the first strikethrough line (3) and extends further in the heating region (2') than the second strikethrough line (4), and the intersection (7) of the first generatrix and the second generatrix (5, 6) is located at the contact between the first strikethrough line (3) and the first partition boundary (11).

9. The window glass (10) according to claim 8, further comprising a second partition boundary (12), and in use, the power density in the heating region (2') between the first partition boundary and the second partition boundary (11, 12) is from 200 to 1,000 W / m². 2 Within the range.

10. The window glass (10) according to claim 8, further comprising a second partition boundary (12), and in use, the power density in the heating region (2') between the first partition boundary and the second partition boundary (11, 12) is from 300 to 600 W / m 2 Within the range.

11. A method for manufacturing window glass (10) for electric heating according to claim 1, comprising the following steps: - Provide glass plate (1); - A conductive coating (2) is applied to the glass plate (1); - Provide a first strikethrough line (3) in the conductive coating (2) to form a heating region (2'); - Configure a second strikethrough line (4) that contacts the first strikethrough line (3) and extends in the heating area (2'); - The first busbar and the second busbar (5, 6) are arranged at least partially on the heating area (2') adjacent to the first stripping line (3); - The intersection (7) of the first busbar and the second busbar (5, 6) is arranged at the contact point between the first strikethrough line and the second strikethrough line (3, 4).

12. The method of claim 11, further comprising the step of pyrolytically depositing a conductive coating (2) during the manufacture of the glass plate (1).

13. The method according to claim 11 or claim 12, further comprising the step of forming a first deletion line (3) and / or a second deletion line (4) by laser removal of the conductive coating (2).

14. The method according to claim 11 or claim 12, further comprising the step of printing the first busbar (5) using conductive ink.

15. The method according to claim 11 or claim 12, further comprising the step of printing an insulating layer (9) with non-conductive ink between the steps of printing the first busbar and the second busbar (5, 6) with conductive ink.

16. A method of using the window glass (10) according to claim 1 as a windshield, rear window, side window or roof window of a motor vehicle, or as a heater in a building, or a refrigerator door or a window in a street facility.

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