OPTICAL FILM, AND POLARIZING PLATE, SURFACE PLATE, IMAGE DISPLAY PANEL AND IMAGE DISPLAY DEVICE EACH USING OPTICAL FILM, AND MANUFACTURING METHOD OF OPTICAL FILM, AND SELECTION METHOD OF OPTICAL FILM

• Main Authors: TANAKA MASASHI, FURUI GEN, TSUJIMOTO JUN, IKEDA KEISUKE, IWATA YUKIMITSU, TAKEI MICHIAKI
• Format: Patent
• Language: English; Japanese
• Published: 11.04.2024
• Subjects: OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS; OPTICS; PHYSICS

To provide an optical film which is excellent in antiglare property and from which fingerprint is excellently wiped.SOLUTION: An optical film is provided, including a first surface and a second surface which is the surface opposite to the first surface, the optical film includes an antireflection layer and an antiglare layer in this order from the first surface to the second surface, where the first surface has a recessed and projected shape. An arithmetic mean height Sa of the first surface, defined by ISO 25178-2: 2012 is 0.05 μm or more, and the first surface satisfies the following Expression 1. Sw×Vmp≤2.00 (Expression 1) [In Expression 1, "Sw" is an inclination angle (degree) when 30 μl droplets of pure water flow down on the first surface. In Expression 1, "Vmp" is a value of a peak material volume (ml/m2) of the first surface, defined by ISO 25178-2: 2012].SELECTED DRAWING: Figure 1 【課題】防眩性に優れ、かつ、指紋拭き取り性が良好な光学フィルムを提供する。【解決手段】第１面と、前記第１面とは反対側の面である第２面とを有する光学フィルムであって、前記光学フィルムは、前記第１面から前記第２面に向けて、反射防止層及び防眩層をこの順に有し、前記第１面は凹凸形状を有し、前記第１面は、ＩＳＯ ２５１７８－２：２０１２に規定される算術平均高さであるＳａが０．０５μｍ以上であり、前記第１面が下記式１を満たす、光学フィルム。Ｓｗ×Ｖｍｐ≦２．００ （式１）［式１中、「Ｓｗ」は、前記第１面において、３０μｌの純水の液滴が流れ落ちる時の傾斜角（度）である。式１中、「Ｖｍｐ」は、前記第１面のＩＳＯ ２５１７８－２：２０１２に規定される突出山部実体体積（ｍｌ／ｍ２）の値である。］【選択図】図１