| 摘要 |
PROBLEM TO BE SOLVED: To provide an IR transmission filter which is simple in design and is excellent in surface mechanical strength and water resistance. SOLUTION: The IR transmission filter is formed by alternately laminating zinc sulfide thin films having refractive index of 2.0 to 2.30 and high-refractive index thin films having refractive index of≥3.00 on one side of a IR transmissive substrate in such a manner the high-refractive index thin film is arranged in the uppermost part, and laminating a diamond-like carbon thin film having refractive index of 2.01 to 2.30 further thereon. COPYRIGHT: (C)2006,JPO&NCIPI
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