| 摘要 |
<P>PROBLEM TO BE SOLVED: To improve the transmittance of visible light, to cut a wide-area heat ray, and to prevent the deterioration of a heat ray cutting effect even in continuous use at high temperatures. <P>SOLUTION: This wide area heat ray cut filter 1 includes an optical multilayer film 8 on a transparent substrate 7. The optical multilayer film 8 is formed by alternately stacking high refractive index material layers 9 and low refractive index material layers 10, and has a first reflection section 11 for reflecting the heat ray of a wavelength of about 1,000-2,000 nm and a second reflection section 12 for reflecting the heat ray of a wavelength of about 800-1,300 nm. The first reflection section 11 has a first structure 13 where a thin high refractive index material layer 9, a thin low refractive index material layer 10, and a thick high refractive index material layer 9 are sequentially stacked, and a second structure 14 where a thin low refractive index material layer 10, a thin high refractive index material layer 9, and a thick low refractive index material layer 10 are sequentially stacked. The first structure 13 and the second structure 14 are alternately stacked. In the cut filter 1, the transmittance for the visible light and the heat ray cutting effect are improved, and the heat ray cutting effect is not deteriorated even in continuous use at high temperatures. <P>COPYRIGHT: (C)2010,JPO&INPIT |
