| 摘要 |
PROBLEM TO BE SOLVED: To provide an optical filter which can be manufactured easily and has superior effects of suppressing luminance shading and color shading. SOLUTION: The optical filter 21 is made, by alternately layering a first optical film H having a first refractive index and a second optical film M1, having a second refractive index on light transmissive substrates (base plates) 11W, 12W, wherein the first refractive index is higher than the refractive index of the substrate, and the second refractive index is higher than the refractive index of the substrate and is lower than the first refractive index. By using an intermediate refractive index film, having a refractive index higher than that of the substrate and lower than that of the first optical film H as the second optical film M1, the difference in the refractive index, between first and second optical films, is reduced, and the spectroscopic characteristics shift in the optical thickness, with respect to a change in an incident angle of light, is suppressed. COPYRIGHT: (C)2008,JPO&INPIT
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