| 摘要 |
PURPOSE:To provide an optical member having an antireflection film in which a synthetic resin substrate does not discolor even though a TiO2 layer exhibiting a low visual reflective characteristic and having a high refractivity formed thereon, countless dents and creases can hardly develop on the antireflection film even though the TiO2 layer is formed on an optical substrate made of synthetic resin such as polyurethane resin which is likely to be deformed with time. CONSTITUTION:In an optical member incorporating a laminated antireflection film in which a TiO2 layer having an optical film thickness of lambda/2 (where lambdais a designed wave length in a range from 500 to 550nm) is formed over a synthetic resin substrate, the TiO2 layer is formed by irradiating an oxygen ion beam onto the substrate, having a refractive index in a range of 2.25 to 2.35. |
