Heat wave shielding lamination
First Claim
1. A heat wave shielding lamination comprising a visible light transparent substrate and an overlying composite lamination consisting of at least one first electrically conductive layer formed of indium tin oxide and at least one second electrically conductive layer formed of In2 O3 arranged alternately on top of one another, said first and second layers having approximately the same refractive indexes in the visible light range in order to get good transmittance to visible light but having different refractive indexes in the infrared spectrum against which shielding is desired, said first layer having a thickness of about λ
- /4nA (where λ
stands for the wavelength at the center of said infrared spectrum and nA stands for the refractive index at the wavelength λ
) and said second layer having a thickness of about λ
/4nB (where λ
stands for the wavelength at the center of said infrared spectrum and nB stands for the refractive index at the wavelength λ
), whereby said first and second layers together exhibit shielding effect against infrared rays in the infrared spectrum by interferential reflection of such rays.
1 Assignment
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Accused Products
Abstract
A heat wave shielding lamination consisting of two types of infrared shield layers having different optical characteristics laminated alternately one on top of another is provided on the surface of a glass substrate to realize shielding against heat waves, particularly infrared rays near the visible light range, without impairing transmittance to visible light. Both types of infrared shield layers have approximately the same refractive indexes in the visible light range but have different refractive indexes in the heat wave spectrum against which shielding is desired. The thickness of one type of infrared shield layer is made to equal λ/4nA (where λ stands for the wavelength at the center of said heat wave spectrum and nA stands for the refractive index at the wavelength λ) and the thickness of the other type of infrared shield layer is made equal to λ/4nB (where λ stands for the wavelength at the center of said heat wave spectrum and nB stands for the refractive index at the wavelength λ). The heat wave shielding therefore has good transmittance to visible light and good shielding effect against heat waves by virtue of the fact that at least one type of said layers exhibits shielding effect against long-wavelength rays in the infrared spectrum by absorbing and/or reflecting such rays and the fact that the two types of infrared shield layers together exhibit shielding effect against infrared rays in the near-infrared spectrum by interferential reflection of such rays.
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Citations
10 Claims
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1. A heat wave shielding lamination comprising a visible light transparent substrate and an overlying composite lamination consisting of at least one first electrically conductive layer formed of indium tin oxide and at least one second electrically conductive layer formed of In2 O3 arranged alternately on top of one another, said first and second layers having approximately the same refractive indexes in the visible light range in order to get good transmittance to visible light but having different refractive indexes in the infrared spectrum against which shielding is desired, said first layer having a thickness of about λ
- /4nA (where λ
stands for the wavelength at the center of said infrared spectrum and nA stands for the refractive index at the wavelength λ
) and said second layer having a thickness of about λ
/4nB (where λ
stands for the wavelength at the center of said infrared spectrum and nB stands for the refractive index at the wavelength λ
), whereby said first and second layers together exhibit shielding effect against infrared rays in the infrared spectrum by interferential reflection of such rays. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
- /4nA (where λ
Specification