Patent ID: 6939613

Claim:
An optical member comprising a plastic substrate; an antireflection film on the substrate, wherein an outermost layer from the substrate of the antireflection film is a layer containing, as a major component, vapor deposited silicon dioxide; and a fluorine-containing water-repellent layer is further externally provided on the outermost layer of the antireflection film, wherein the optical member has the following characteristics: (1) after the water-repellent layer is initially provided, a stationary contact angle to water before rubbing of the water-repellent layer is at least 104°, (2) after a grade B chamois skin, as defined in KK-C-300C according to the Federal Specifications and Standards of U.S.A., 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 to water after rubbing of the water-repellent layer is from 0 to 10° smaller than the stationary contract angle to water before rubbing, and (3) a luminous reflectance of the optical member before providing the water-repellant layer is substantially identical to a luminous reflectance of the optical member after providing the water-repellant layer.