Light control with color enhancement
First Claim
1. A window panel, comprisinga light transmissive substrate constituting a panel body, and having a first side for facing inwardly and a second side for facing outwardly,a semireflective layer intimately bonded to the second side, of a thickness to allow broad band spectral transmission through said substrate of at least 50% of light in the visible band incident thereupon, anda dielectric layer over said semireflective layer, said dielectric layer being of optically uniform thickness,the reflectance of said semireflective layer and the thickness of said dielectric layer producing, at one or more wavelengths, a differential effect in intensity, of reflected light incident upon said panel from the direction faced by said second side, by interference between incident light reflected from said dielectric layer and light transmitted through said dielectric layer and reflected from said semireflecting layer, said semireflective and dielectric layers rejecting between about 70-95% of infrared radiation striking said panel and said differential effect altering the spectral distribution of light in the visible band by an amount for controlling a colored appearance formed by said two layers when viewing toward the panel from the direction of said second side.
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Abstract
A window achieves broad band infrared reflection with a thin reflective layer and a clear interference coating on its outside surface. Color viewed from outside is enhanced by varying the thickness of the interference coating, while the window still exhibits neutral color to transmitted light. The reflective layer is formed of a metal such as copper, gold or copper alloy to provide enhanced IR reflection extending beyond ten microns. The metal is preferably deposited without agglomeration, and with uniformity that permits high and neutral transmission of visible light.
39 Citations
10 Claims
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1. A window panel, comprising
a light transmissive substrate constituting a panel body, and having a first side for facing inwardly and a second side for facing outwardly, a semireflective layer intimately bonded to the second side, of a thickness to allow broad band spectral transmission through said substrate of at least 50% of light in the visible band incident thereupon, and a dielectric layer over said semireflective layer, said dielectric layer being of optically uniform thickness, the reflectance of said semireflective layer and the thickness of said dielectric layer producing, at one or more wavelengths, a differential effect in intensity, of reflected light incident upon said panel from the direction faced by said second side, by interference between incident light reflected from said dielectric layer and light transmitted through said dielectric layer and reflected from said semireflecting layer, said semireflective and dielectric layers rejecting between about 70-95% of infrared radiation striking said panel and said differential effect altering the spectral distribution of light in the visible band by an amount for controlling a colored appearance formed by said two layers when viewing toward the panel from the direction of said second side.
Specification