Heated laminated glass pane having an improved vision comfort
First Claim
Patent Images
1. A laminated heated glazing comprising:
- at least two superposed transparent substrate panes with an interlayer made of a transparent plastic interposed between two adjacent panes;
at least one thin transparent conductive film that continuously extends over at least part of the glazing and disposed on an inside of or on an outer surface of the glazing, the at least one film being heated for deicing and/or demisting by a Joule effect;
a plurality of elongated current leads, each of the current leads being formed of a conductive material and disposed across from each other on a periphery of the glazing and connected to a current source external to the glazing, at least a portion along a length of a first current lead of the plurality of current leads being non-parallel to a least a portion along a length of a second current lead of the plurality of current leads;
a heating area disposed between two of the current leads in a single-phase current supply, or three heating areas disposed between the current leads in a three-phase current supply; and
flow separation lines etched in the film connecting the current leads to each other to guide current from one current lead to another,wherein a width of the flow separation lines is small enough for the flow separation lines to be invisible to the naked eye in the laminated heated glazing, andwherein the flow separation lines have an arcuate portion between the non-parallel portions of the first and second current leads facing each other, the flow separation lines having the arcuate portion are configured to prevent cold spots in sharp corners of the glazing due to the non-parallel current leads.
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Abstract
A laminated heated glazing including at least two superposed transparent and mechanically strong substrate panes with interposition of an interlayer made of a transparent plastic between two adjacent panes. The glazing further includes, in its thickness or on the surface, at least one thin transparent conductive film that extends over at least part of the glazing, the film or films being heated for deicing and/or demisting by Joule effect, at least one film having flow separation lines formed by etching to guide current from one band to the other. The width of the flow separation lines is small enough for them to be invisible to the naked eye in the laminated heated glazing.
34 Citations
18 Claims
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1. A laminated heated glazing comprising:
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at least two superposed transparent substrate panes with an interlayer made of a transparent plastic interposed between two adjacent panes; at least one thin transparent conductive film that continuously extends over at least part of the glazing and disposed on an inside of or on an outer surface of the glazing, the at least one film being heated for deicing and/or demisting by a Joule effect; a plurality of elongated current leads, each of the current leads being formed of a conductive material and disposed across from each other on a periphery of the glazing and connected to a current source external to the glazing, at least a portion along a length of a first current lead of the plurality of current leads being non-parallel to a least a portion along a length of a second current lead of the plurality of current leads; a heating area disposed between two of the current leads in a single-phase current supply, or three heating areas disposed between the current leads in a three-phase current supply; and flow separation lines etched in the film connecting the current leads to each other to guide current from one current lead to another, wherein a width of the flow separation lines is small enough for the flow separation lines to be invisible to the naked eye in the laminated heated glazing, and wherein the flow separation lines have an arcuate portion between the non-parallel portions of the first and second current leads facing each other, the flow separation lines having the arcuate portion are configured to prevent cold spots in sharp corners of the glazing due to the non-parallel current leads. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 17)
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13. A process for fabrication of a glazing, the process comprising:
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joining an assembly of at least two transparent substrate panes together with respective transparent plastic interlayers interposed between the panes; applying at least one thin transparent conductive film having flow separation lines and a plurality of elongated current leads on at least one of the panes, each of the current leads being formed of a conductive material and the thin transparent conductive film being continuous and disposed on an inside or on an outer surface of the glazing and configured to be heated for deicing and/or demisting by a Joule effect; and forming the flow separation lines within a continuous portion of the film by ablation using a YAG laser, or a Nd;
YAG pulsed laser of 1064 nm wavelength, of 20 W pump power and peak power ranging from 2.8 to 110 kW to connect the current leads to each other, the flow separation lines having a width small enough to be invisible to the naked eye,wherein, at least a portion along a length of a first current lead of the plurality of current leads being non-parallel to a least a portion along a length of a second current lead of the plurality of current leads, wherein the flow separation lines are substantially parallel to each other and are joined at substantially right angles to the respective two current leads, and wherein the flow separation lines being curved between the non-parallel portions of the first and second current leads facing each other, the curved flow separation lines preventing cold spots in sharp corners of the glazing due to the non-parallel current leads. - View Dependent Claims (14, 15, 16)
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18. A laminated heated glazing comprising:
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at least two superposed transparent substrate panes with an interlayer made of a transparent plastic interposed between two adjacent panes; at least one thin transparent conductive film that continuously extends over at least part of the glazing and disposed on an inside of or on an outer surface of the glazing, the at least one film being heated for deicing and/or demisting by a Joule effect; a plurality of elongated current leads, each of the current leads being formed of a conductive material and disposed across from each other on a periphery of the glazing and connected to a current source external to the glazing, at least a portion along a length of a first current lead of the plurality of current leads being non-parallel to a least a portion along a length of a second current lead of the plurality of current leads; a heating area disposed between two of the current leads in a single-phase current supply, or three heating areas disposed between the current leads in a three-phase current supply; and flow separation lines etched in the film connecting the current leads to each other to guide current from one current lead to another, wherein a width of the flow separation lines is small enough for the flow separation lines to be invisible to the naked eye in the laminated heated glazing, and wherein the flow separation lines are curved between the non-parallel portions of the first and second current leads such that the flow separation lines are substantially parallel to each other and are joined at substantially right angles to the respective two current leads, the curved flow separation lines preventing cold spots in sharp corners of the glazing due to the non-parallel current leads.
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Specification