Transparent pane having a heatable coating

• US 10,336,298 B2
• Filed: 07/06/2011
• Issued: 07/02/2019
• Est. Priority Date: 07/07/2010
• Status: Active Grant

• Current Assignee: Saint-Gobain Glass France (Compagnie De Saint-Gobain)
• Original Assignee: Saint-Gobain Glass France (Compagnie De Saint-Gobain)
• Inventors: Lisinski, Susanne, Melcher, Martin, Offermann, Volkmar, Schlarb, Andreas
• Primary Examiner(s): Abraham, Ibrahime A
• Assistant Examiner(s): Bae, Gyounghyun
• Application Number:
  US13/704,982
• Publication Number:
  US 20130186875A1
• Time in Patent Office: 2,918 Days
• Field of Search: 219203, 219202, 219522, 219543
• CPC Class Codes: B32B 17/10036 comprising two outer glass sheets
• CPC Class Codes: B32B 17/10174 Coatings of a metallic or dielectric material on a constituent layer of glass or polymer
• CPC Class Codes: B32B 17/10192 patterned in the form of columns or grids
• CPC Class Codes: B60S 1/026 using electrical means
• CPC Class Codes: H05B 2203/011 Heaters using laterally extending conductive material as connecting means
• CPC Class Codes: H05B 2203/016 Heaters using particular connecting means
• CPC Class Codes: H05B 3/84 Heating arrangements specially adapted for transparent or reflecting areas, e.g. for demisting or de-icing windows, mirrors or vehicle windshields
• CPC Class Codes: H05B 3/86 the heating conductors being embedded in the transparent or reflecting material H05B3/845 takes precedence

Abstract

A transparent pane with a conductive coating extending at least over a part of the transparent pane surface, in particular over a visual field of the transparent pane is described. The conductive coating is electrically connected to at least two strip-shaped bus bars such that after application of a supply voltage, a current flows over a heating field formed by the conductive coating. The conductive coating has an electrical resistance such that upon application of a supply voltage in the range from more than 100 volts to 400 volts, a heating output from the heating field is in the range from 300 watt/m² to 1000 watt/m². The at least two strip-shaped bus bars have a maximum width of less than 5 mm and are dimensioned such that a maximum electrical power loss per unit of length is 10 watt/m. Moreover, the at least two strip-shaped bus bars have a specific resistivity ranging from 2 μohm·cm to 4 μohm·cm.

Claims

1. A transparent pane, comprising:

a first pane having a surface;

a conductive coating extending at least over a part of the surface of the first pane; and

at least two strip-shaped bus bars on the first pane,

wherein the conductive coating is electrically connected to the at least two strip-shaped bus bars, wherein the at least two strip-shaped bus bars are configured to receive a supply voltage from a power source and wherein after application of the supply voltage, a current flows over a heating field formed between the at least two strip-shaped bus bars,

wherein the conductive coating has an electrical resistance such that upon application of the supply voltage in a range between more than 100 volts and 400 volts, a heating output from the heating field is in a range from 300 watt/m² to 1000 watt/m²,

wherein the conductive coating has an electrical resistance per surface unit in a range from more than 100 ohms/square meter to 200 ohms/square meter,

wherein the at least two strip-shaped bus bars have at least in sections of the at least two strip-shaped bus bars, a maximum width of less than 5 mm and a width of the at least two strip-shaped bus bars being dimensioned such that a maximum electrical power loss per unit of length is 10 watt/m,

wherein a cross-sectional area along the width and perpendicular to a length of the at least two strip-shaped bus bars is in a range from 0.01 to 1 mm², and

wherein the at least two strip-shaped bus bars having a specific resistivity in a range from 2 μ

ohm·

cm to 4 μ

ohm·

cm.

2. The transparent pane according to claim 1, wherein the at least two strip-shaped bus bars have at least in sections of the at least two strip-shaped bus bars, a width in a range from 1 mm to less than 5 mm.

3. The transparent pane according to claim 1, wherein the at least two strip-shaped bus bars have an electrical resistance per unit of length in a range from 0.15 ohm/m to 4 ohm/m.

4. The transparent pane according to claim 1, wherein the conductive coating has an electrical resistance such that a current flowing through the heating field has a maximum magnitude of 5 A.

5. The transparent pane according to claim 1, wherein the at least two strip-shaped bus bars are adapted to be electrically contacted in a common connector zone by connector conductors.

6. The transparent pane according to claim 1, wherein the heating field is subdivided by one or a plurality of decoated zones into a plurality of segments galvanically separated from each other, wherein the plurality of segments are serially connected to each other by the at least two strip-shaped bus bars.

7. The transparent pane according to claim 1, wherein the heating field is subdivided by one or a plurality of decoated zones into a plurality of segments galvanically connected to each other in series, wherein a current path between the at least two strip-shaped bus bars is lengthened relative to a current path without decoated zones.

8. The transparent pane according to claim 7, wherein the plurality of decoated zones is implemented as parallel lines.

9. The transparent pane according to claim 7, wherein the plurality of decoated zones form a staggered pattern, wherein zone ends of adjacent decoated zones face opposite edges of the transparent pane.

10. The transparent pane according to claim 1, wherein the at least two strip-shaped bus bars are produced by printing a metallic printing paste onto the conductive coating.

11. The transparent pane according to claim 10, wherein the at least two strip-shaped bus bars are produced by using a screen-printing method.

12. The transparent pane according to claim 1, wherein the at least two strip-shaped bus bars are produced in form of prefabricated metal strips connected to the conductive coating, the prefabricated metal strips being affixed on the conductive coating by a conductive adhesive.

13. The transparent pane according to claim 1, further comprising a second pane having a surface, wherein the first pane and the second pane are bonded to each other by a thermoplastic adhesive layer, wherein the conductive coating is situated on at least one surface of the first pane and the second pane or on a surface of a carrier disposed between the first pane and the second pane.

14. The transparent pane according to claim 1, wherein the transparent pane is implemented as a motor vehicle windshield, wherein a bus bar of the at least two strip-shaped bus bars disposed on a lower edge of the transparent pane is situated under a resting or parked position of windshield wipers provided to wipe the transparent pane.

15. The transparent pane according to claim 1, wherein the transparent pane is implemented as a motor vehicle windshield, wherein the at least two strip-shaped bus bars are disposed on a lateral edge of the first pane.

16. The transparent pane according to claim 15, wherein the at least two strip-shaped bus bars are covered by at least one opaque covering element.

17. A method comprising:

using the transparent pane according to claim 1 as a functional individual piece, as a built-in part in furniture, devices, or buildings, as well as in means of transportation on land, in air, or on water.

18. The method according to claim 17, wherein the transparent pane is used as a windshield, rear window, side window, and/or glass roof in means for transportation.

19. The method according to claim 18, wherein the means for transportation is a motor vehicle.