Abstract A heat-reflecting window pane which has a transmissivity of 20 to 60 percent for visible light comprises a transparent support layer provided with a heat-reflecting gold film and when installed presents the support layer to the exterior. An absorption layer is disposed between the transparent support layer and the gold film, such absorption layer being of a material and thickness such that the light transmissivity of the combined support and absorption layers is 10 to 65 percent less than that of the support layer alone. The support layer has a refractive index and absorption coefficient of the same order of magnitude and may comprise an element from the fourth period of the periodic table with an atomic weight between 20 and 28 or an alloy containing such an element. An anti-reflective layer is disposed on the other side of the gold film and may be covered by a transparent protective layer. The anti-reflective layer, e.g., made of zinc sulphide, is made of dielectric material which is substantially absorption-free for visible light and has a refractive index of more than 1.7.
A heat-reflecting pane in accordance with claim 1, wherein the light transmissivity of the laminate comprising the transparent support layer and the absorption layer is 15 to 60 percent less than that of the transparent support layer.
Claim 2
Dependent Claim
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A heat-reflecting pane in accordance with claim 1, wherein the absorption layer has a refractive index and an absorption coefficient which are approximately identical for visible light.
Claim 3
Dependent Claim
32 words
A heat-reflecting pane in accordance with claim 1, wherein the absorption layer comprises an element from the fourth period of the periodic table and having an atomic number between 20 and 28.
Claim 4
Dependent Claim
35 words
A heat-reflecting pane in accordance with claim 1, wherein the absorption layer comprises an alloy including an element from the fourth period of the periodic table and having an atomic number between 20 and 28.
Claim 5
Dependent Claim
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A heat-reflecting pane in accordance with claim 5, wherein the absorption layer comprises a chromium nickel alloy.
Claim 6
Dependent Claim
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A heat-reflecting pane in accordance with claim 5, wherein the Absorption layer comprises a chromium-iron-aluminum alloy.
Claim 7
Dependent Claim
31 words
A heat-reflecting pane in accordance with claim 1, wherein the absorption layer consists of a chromium-nickel alloy containing 20 percent of weight of chromium and 80 percent by weight of nickel.
Claim 8
Dependent Claim
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A heat-reflecting pane in accordance with claim 1, wherein the anti-reflecting layer comprises zinc sulphide.
Claim 9
Dependent Claim
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A heat-reflecting pane in accordance with claim 1, wherein the anti-reflecting layer is covered by a transparent protective layer.
Claim 10
Dependent Claim
23 words
A heat-reflecting pane in accordance with claim 1, wherein the anti-reflecting layer is joined by an intermediate layer to a glass cover sheet.
Claim 11
Dependent Claim
21 words
A double-glazed window pane, wherein a heat-reflecting pane in accordance with claim 1 forms the outer sheet of the double-glazed pane.