| 摘要 |
An optical filter ( 100 ) includes a substrate ( 110 ), a number of contiguous identical lower filter cavities ( 120 ) formed on the substrate and a number of contiguous upper filter cavities ( 130 ) formed on the lower filter cavities. Each of the lower filter cavities consists of two high refractive index layers ( 121 ) and one low refractive index layer ( 122 ) sandwiched between the high refractive index layers. Each of the upper filter cavities consists of two low refractive index layers ( 132 ) and one high refractive index layer ( 131 ) sandwiched between the low refractive index layers. The present invention calculates optimal thicknesses for each layer, so that can shield infrared and ultra violet radiation precisely.
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