| 摘要 |
A solar screening panel comprises one or more sheets of glass 1, 2, a glass face of the panel bearing an optical coating 4, for screening off a proportion of solar radiation. The optical coating 4 is a light- transmitting coating which comprises a metal layer. The radiant energy absorbing properties of the glass sheets 1, 2 and the composition and thickness of the coating 4 are such that when the panel is arranged with the face bearing the coating 4 facing away from a radiation source the panel has a total energy transmission factor of less than 70% and a luminous transmission factor of at least 15% and such that when the panel is illuminated by CIE illuminant D65 the light reflected back from the panel has a dominant wavelength of from 585 to 595 nm and a colour purity of at least 40%. Laminated panels having total energy and luminous transmission factors as given above are disclosed in which similarly measured reflected light has a dominant wavelength of from 590 to 600 nm and a colour purity of at least 30%. The metal layer may be a gold layer e.g. 20.5 to 23.5 nm thick optionally provided with a bismuth oxide underlayer e.g. from 23.5 to 28.5 nm thick. <IMAGE> |
