| 摘要 |
PURPOSE:To provide the antireflection film and antireflection member having an excellent antireflection effect even with a number of superposition of two layers for light having a wavelength region, excellent mass productivity, excellent contamination resistance and excellent property to sustain the antireflection effect. CONSTITUTION:This antireflection film consists of at least the superposition of layers consists of a fluorine-containing layer (1) having an optical film thickness of 0.2 to 0.3 times the central wavelength in the wavelength region desired for antireflection and a Y2O3 layer (2) of 0.45 to 0.55 times the wavelength described above and has this fluorine-contained layer on an incident side surface. The fluorine-containing layer consists of a fluorine-contained compd. having thickness 100mum, transmittance >=80%, fluorine atom content >=60wt.% and refractive index <=1.40. This antireflection member has such antireflection film on at least one side of a transparent base material. |
