US 12,135,406 B2
Optical film, and polarizing plate, surface plate, image display panel and image display device using the optical film, and method for producing the optical film, and method for selecting optical film, and evaluation method of finger print wiping property
Jun Tsujimoto, Bizen (JP); Yukimitsu Iwata, Okayama (JP); Michiaki Takei, Okayama (JP); Masafumi Tanaka, Misato (JP); Keisuke Ikeda, Okayama (JP); and Gen Furui, Okayama (JP)
Assigned to DAI NIPPON PRINTING CO., LTD., Tokyo (JP)
Filed by DAI NIPPON PRINTING CO., LTD., Tokyo (JP)
Filed on Mar. 26, 2024, as Appl. No. 18/617,293.
Application 18/617,293 is a continuation of application No. 18/686,673, previously published as PCT/JP2023/034628, filed on Sep. 25, 2023.
Claims priority of application No. 2022-158197 (JP), filed on Sep. 30, 2022; and application No. 2022-158209 (JP), filed on Sep. 30, 2022.
Prior Publication US 2024/0272330 A1, Aug. 15, 2024
Int. Cl. G02B 1/11 (2015.01); G02B 5/30 (2006.01)
CPC G02B 1/11 (2013.01) [G02B 5/30 (2013.01)] 17 Claims
OG exemplary drawing
 
1. An optical film having a first surface, and a second surface which is a surface opposite to the first surface,
wherein the optical film comprises an anti-reflection layer and an anti-glare layer in this order from the first surface to the second surface,
the first surface has a profile of depressions and projections,
the first surface has a dale void volume Vvv of 0.005 ml/m2 or more and 0.100 ml/m2 or less specified in ISO 25178-2:2012,
the first surface has a minimum autocorrelation length Sal of 4.0 μm or more and 12.0 μm or less specified in ISO 25178-2:2012, and
has a drop contact angle of 30.0 degrees or more and 70 degrees or less measured by the following method:
dropping a droplet having a surface tension of 30 mN/m onto the first surface of the optical film from a height of 45 mm, where the droplet is dropped in a direction vertical to the first surface; and measuring a static contact angle by a θ/2 method after 10 seconds after the droplet has reached the first surface.