Reflection preventing film of synthetic resin lens

Abstract

Abstract PURPOSE:To prevent the waves of the spectral reflectivity characteristics produced by the difference in refractive index with a synthetic resin lens by using silicon oxynitride that permits free changing of its refractive index within a certain range as a hard coating layer. CONSTITUTION:When the ratio of x/y of silicon oxynitride expressed as SiOxNy is near 0, its refractive index approaches to 2, and when the ratio of s/y increases, the refractive index approaches to 1.46. The ratio of the silicon oxynitride is used as a hard coating layer 31 by changing the ratio of oxygen and nitrogen, and is conformed to the refractive index of a synthetic resin lens 30. As a result, the waves of the spectral reflectivity characteristics produced by the difference in the mutual refractive indices are eliminated, and the reflection preventing films 32-34 for synthetic resin lenses having superior reflection preventing effect are made with good reproducibility.

Inventors

• 👤 Kenji Kojima
• 👤 Hiroichi Deguchi
• 👤 Takao Mogami

Bibliographic Details