| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an infrared multilayered film which is excellent in durability or environmental resistance and provided with satisfactory optical characteristics. <P>SOLUTION: Infrared multilayered film 3 and 13 are formed on an infrared optical substrate 2. The infrared multilayered film 3, 13 are formed of laminated products in which low refractive layers 4, 14 having a low refractive index, intermediate refractive layers 5, 15 higher in refractive index than the low refractive layers 4, 14, high refractive layers 6, 16 higher in refractive index than the intermediate refractive layers 5, 15, intermediate refractive layers 7, 17, low refractive layers 8, 18 and a protective layer 9 formed of a non-oxide material are laminated in this order from the substrate side. The low refractive layers 4, 14, 8 and 18 are formed of a fluoride film, the intermediate refractive layers 5, 15, 7 and 17 are formed of a ZnS film or ZnSe film, and the high refractive layer 6 and 16 is formed of a Ge film. <P>COPYRIGHT: (C)2009,JPO&INPIT |
