Optical member, process of producing optical member, and process of producing thin film

摘要

[Problem] To provide an optical member having a more improved durability characteristic than the durability characteristic of the conventional water-repellent films and a process of producing an optical member. [Means for Dissolution] An optical member having an antireflection film on a substrate, wherein an outermost layer of the antireflection film is a layer containing, as a major component, silicon dioxide vapor deposited by vapor deposition; the layer is further externally provided with a fluorine-containing water-repellent layer; and the optical member has the following characteristics (1) and (2) : (1) when the water-repellent layer is provided, a stationary contact angle (stationary contact angle before rubbing) to water is 104° or more, and (2) when a chamois skin is dipped in water at 25°C for 5 minutes, and the surface of the water-repellent layer is then rubbed 10,000 times by the chamois skin while applying a load of 500 g, a stationary contact angle (stationary contact angle after rubbing) is from 2 to 10° smaller than the stationary contact angle before rubbing.