Patent ID: 11960162
Assignee: DAI NIPPON PRINTING CO., LTD.
Field: Optics (Instruments)
Classification: CPC G  B  H | IPC G

Claim 0:
1. An anti-glare film comprising an anti-glare layer, the anti-glare film having an uneven surface, wherein a smoothed reflected light intensity measured under the following measurement conditions satisfies the following conditions 1 and 2, wherein the uneven surface has a three-dimensional mean peak interval Smp of 2.524 μm or more and 8.228 μm or less,, <measurement conditions>
(1) in a transmission measurement mode of a goniophotometer, a visible light beam is emitted as a parallel light beam from a light source of the goniophotometer, an intensity of the emitted light is measured at an aperture angle of 1 degree without passing through a sample, and standardization is performed so that the maximum intensity is 100,000;
(2) a black plate is bonded to a surface opposite to the uneven surface of the anti-glare film via a transparent adhesive layer to produce a sample α in which the anti-glare film, the transparent adhesive layer, and the black plate are laminated and which has the uneven surface;
(3) the sample α is placed in the goniophotometer, the uneven surface of the sample α is irradiated with a visible light beam as a parallel light beam from the light source of the goniophotometer, and a reflected light intensity is measured at an aperture angle of 1 degree, wherein an irradiation angle of the parallel light beam is set to a direction inclined by +45 degrees from a normal direction of the sample α, the reflected light intensity is measured at intervals of 1 degree from 0 degrees, which is the normal direction of the sample α, to −85 degrees, and in order to maintain effects of standardization in (1), the reflected light intensity is measured in the transmission measurement mode; and
(4) a smoothing process represented by the following formula (i) is performed at each angle from 0 degrees to −85 degrees, and the reflected light intensity after the smoothing process is defined as the smoothed reflected light intensity at each angle:

n−degree smoothed reflected light intensity=([n−2-degree reflected light intensity]+[n−1-degree reflected light intensity]+[n−degree reflected light intensity]+[n+1-degree reflected light intensity]+[n+2-degree reflected light intensity])/5  (i), <condition 1>
when the n-degree smoothed reflected light intensity is defined as Rn, and the n−1-degree smoothed reflected light intensity is defined as Rn−1, a maximum absolute value of difference between Rn and Rn−1 is 2.00 or less, and, <condition 2>
the smoothed reflected light intensity at −35 degrees is 0.1 or more and 4.0 or less.