Patent ID: 8747991
Filing Date: 2014-06-10
Classification: G02B,Y10T

Abstract:
1. An optical device comprising: a substrate having a three-dimensionally random concave-convex shape on a surface thereof; and a hard coat layer formed on the substrate, wherein a projection height with a maximum frequency on the substrate surface falls within a range substantially of 1.5 μm or more and not more than 10 μm; projections larger than the projection height with the maximum frequency on the substrate surface have a height falling within +3 μm from the projection height with the maximum frequency; projections larger than the projection height with the maximum frequency on the hard coat layer surface have a height falling within +1 μm from the projection height with the maximum frequency, wherein the maximum projection height on the hard coat layer surface is at least 4 μm and is greater than the projection height with the maximum frequency on the hard coat layer surface; and a length RSm of a mean spacing of concaves and convexes on the substrate surface is 55 μm or more and not more than 500 μm.