Patent ID: 8493660
Filing Date: 2013-07-23
Classification: G02B

Abstract:
1. An optical layered body comprising a light-transmitting substrate and an antiglare layer provided on the light-transmitting substrate, wherein the antiglare layer has a surface roughness on the outermost surface and a surface haze of 1 to 4%, and wherein in the optical layered body, a mean spacing of tops of local peak of profile S is 0.045 mm or more and 0.10 mm or less determined by the following procedure: a roughness curve of the surface roughness is measured, a mean line of the roughness curve is drawn, and a reference length is set in a direction of the mean line, total number (m) of tops of local peak of profile of the roughness curve within the reference length is counted, Si representing a value of a length between a (m)th top of local peak of profile and a (m−1)th top of local peak of profile, and n representing number of Si are introduced into the following formula (I): to determine S′, and a value of S′ in the following same reference length is calculated and the calculation is repeated N times, and S′j representing a value of S′ calculated in the above formula (I) and N representing number of S′j are introduced into the following formula (II): to determine a mean spacing of tops of local peak of profile S, and wherein when denoting a mean spacing of profile irregularities of the surface of the optical layered body by Sm, a mean inclination angle of profile irregularities by θa, and mean roughness of the surface roughness by Rz,