OPTICAL ELEMENT HAVING REFLECTION PREVENTING FILM

摘要

PROBLEM TO BE SOLVED: To provide an optical element having a reflection preventing film which has hydrophobicity and a low refractive index and is applicable to a lens having a low glass transition temperature.

SOLUTION: The optical element has a reflection preventing film 2 on the surface of a lens 1 and the reflection preventing film 2 is provided with a silica aerogel layer which is processed in a hydrophobic manner.

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