| 摘要 |
The reflection-preventing film for optical substrate is composed of a first layer (2) of aluminum oxide (Al2O3) having a refractive index of 1.60-1.70 and a thickness of 0.25 &lgr;o, a second layer (3) of zirconium oxide (ZrO2) having a refractive index of 1.90-2.20 and a thickness of 0.125-0.25 &lgr;o, a third layer (4) of titanium dioxide (TiO2) having a refractive index of 2.20-2.50 and a thickness of 0-0.125 &lgr;o, a fourth layer (5) of zirconium oxide (ZrO2) having a refractive index of 1.90-2.20 and a thickness of 0.25 &lgr;o, and a fifth layer (6) of manganese difluoride (MgF2) having a refractive index of 1.30-1.45 and a thickness of 0.25 o.
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