Electric heating – Heating devices – With heating unit structure
Patent
1983-05-25
1985-03-26
Mayewsky, Volodymyr Y.
Electric heating
Heating devices
With heating unit structure
219354, 219522, 350 16, 350164, H05B 316
Patent
active
045075476
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 .lambda./4n.sub.A (where .lambda. stands for the wavelength at the center of said heat wave spectrum and n.sub.A stands for the refractive index at the wavelength .lambda.) and the thickness of the other type of infrared shield layer is made equal to .lambda./4n.sub.B (where .lambda. stands for the wavelength at the center of said heat wave spectrum and n.sub.B stands for the refractive index at the wavelength .lambda.). 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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Sawada Yutaka
Taga Yasunori
Kabushiki Kaisha Toyota Chuo Kenkyusho
Mayewsky Volodymyr Y.
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